From 099f53cb50e45ef617a9f1d63ceec799e489418b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 8 Apr 2009 14:28:37 -0700 Subject: [PATCH 01/91] async_tx: rename zero_sum to val 'zero_sum' does not properly describe the operation of generating parity and checking that it validates against an existing buffer. Change the name of the operation to 'val' (for 'validate'). This is in anticipation of the p+q case where it is a requirement to identify the target parity buffers separately from the source buffers, because the target parity buffers will not have corresponding pq coefficients. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 14 +++++----- arch/arm/mach-iop13xx/setup.c | 8 +++--- arch/arm/plat-iop/adma.c | 2 +- crypto/async_tx/async_xor.c | 16 +++++------ drivers/dma/dmaengine.c | 4 +-- drivers/dma/iop-adma.c | 38 +++++++++++++-------------- drivers/md/raid5.c | 2 +- include/linux/async_tx.h | 2 +- include/linux/dmaengine.h | 8 +++--- 9 files changed, 47 insertions(+), 47 deletions(-) diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 9f59fcbf5d8..4af12180d19 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -61,13 +61,13 @@ async_(, void *callback_parameter); 3.2 Supported operations: -memcpy - memory copy between a source and a destination buffer -memset - fill a destination buffer with a byte value -xor - xor a series of source buffers and write the result to a - destination buffer -xor_zero_sum - xor a series of source buffers and set a flag if the - result is zero. The implementation attempts to prevent - writes to memory +memcpy - memory copy between a source and a destination buffer +memset - fill a destination buffer with a byte value +xor - xor a series of source buffers and write the result to a + destination buffer +xor_val - xor a series of source buffers and set a flag if the + result is zero. The implementation attempts to prevent + writes to memory 3.3 Descriptor management: The return value is non-NULL and points to a 'descriptor' when the operation diff --git a/arch/arm/mach-iop13xx/setup.c b/arch/arm/mach-iop13xx/setup.c index cfd4d2e6dac..9800228b71d 100644 --- a/arch/arm/mach-iop13xx/setup.c +++ b/arch/arm/mach-iop13xx/setup.c @@ -478,7 +478,7 @@ void __init iop13xx_platform_init(void) dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); - dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask); + dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); @@ -490,7 +490,7 @@ void __init iop13xx_platform_init(void) dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); - dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask); + dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); @@ -502,13 +502,13 @@ void __init iop13xx_platform_init(void) dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); - dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask); + dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); dma_cap_set(DMA_PQ_XOR, plat_data->cap_mask); dma_cap_set(DMA_PQ_UPDATE, plat_data->cap_mask); - dma_cap_set(DMA_PQ_ZERO_SUM, plat_data->cap_mask); + dma_cap_set(DMA_PQ_VAL, plat_data->cap_mask); break; } } diff --git a/arch/arm/plat-iop/adma.c b/arch/arm/plat-iop/adma.c index f7242082161..c0400440e21 100644 --- a/arch/arm/plat-iop/adma.c +++ b/arch/arm/plat-iop/adma.c @@ -198,7 +198,7 @@ static int __init iop3xx_adma_cap_init(void) dma_cap_set(DMA_INTERRUPT, iop3xx_aau_data.cap_mask); #else dma_cap_set(DMA_XOR, iop3xx_aau_data.cap_mask); - dma_cap_set(DMA_ZERO_SUM, iop3xx_aau_data.cap_mask); + dma_cap_set(DMA_XOR_VAL, iop3xx_aau_data.cap_mask); dma_cap_set(DMA_MEMSET, iop3xx_aau_data.cap_mask); dma_cap_set(DMA_INTERRUPT, iop3xx_aau_data.cap_mask); #endif diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 95fe2c8d6c5..e0580b0ea53 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -222,7 +222,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) } /** - * async_xor_zero_sum - attempt a xor parity check with a dma engine. + * async_xor_val - attempt a xor parity check with a dma engine. * @dest: destination page used if the xor is performed synchronously * @src_list: array of source pages. The dest page must be listed as a source * at index zero. The contents of this array may be overwritten. @@ -236,13 +236,13 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) * @cb_param: parameter to pass to the callback routine */ struct dma_async_tx_descriptor * -async_xor_zero_sum(struct page *dest, struct page **src_list, +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, int src_cnt, size_t len, u32 *result, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_param) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_ZERO_SUM, + struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR_VAL, &dest, 1, src_list, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; @@ -261,15 +261,15 @@ async_xor_zero_sum(struct page *dest, struct page **src_list, dma_src[i] = dma_map_page(device->dev, src_list[i], offset, len, DMA_TO_DEVICE); - tx = device->device_prep_dma_zero_sum(chan, dma_src, src_cnt, - len, result, - dma_prep_flags); + tx = device->device_prep_dma_xor_val(chan, dma_src, src_cnt, + len, result, + dma_prep_flags); if (unlikely(!tx)) { async_tx_quiesce(&depend_tx); while (!tx) { dma_async_issue_pending(chan); - tx = device->device_prep_dma_zero_sum(chan, + tx = device->device_prep_dma_xor_val(chan, dma_src, src_cnt, len, result, dma_prep_flags); } @@ -296,7 +296,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list, return tx; } -EXPORT_SYMBOL_GPL(async_xor_zero_sum); +EXPORT_SYMBOL_GPL(async_xor_val); static int __init async_xor_init(void) { diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 92438e9dacc..6781e8f3c06 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -644,8 +644,8 @@ int dma_async_device_register(struct dma_device *device) !device->device_prep_dma_memcpy); BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) && !device->device_prep_dma_xor); - BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) && - !device->device_prep_dma_zero_sum); + BUG_ON(dma_has_cap(DMA_XOR_VAL, device->cap_mask) && + !device->device_prep_dma_xor_val); BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) && !device->device_prep_dma_memset); BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) && diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 2f052265122..6ff79a67269 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -660,9 +660,9 @@ iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest, } static struct dma_async_tx_descriptor * -iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src, - unsigned int src_cnt, size_t len, u32 *result, - unsigned long flags) +iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src, + unsigned int src_cnt, size_t len, u32 *result, + unsigned long flags) { struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); struct iop_adma_desc_slot *sw_desc, *grp_start; @@ -906,7 +906,7 @@ out: #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */ static int __devinit -iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) +iop_adma_xor_val_self_test(struct iop_adma_device *device) { int i, src_idx; struct page *dest; @@ -1002,7 +1002,7 @@ iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) PAGE_SIZE, DMA_TO_DEVICE); /* skip zero sum if the capability is not present */ - if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask)) + if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) goto free_resources; /* zero sum the sources with the destintation page */ @@ -1016,10 +1016,10 @@ iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) dma_srcs[i] = dma_map_page(dma_chan->device->dev, zero_sum_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); - tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, - IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, - &zero_sum_result, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs, + IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, + &zero_sum_result, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); cookie = iop_adma_tx_submit(tx); iop_adma_issue_pending(dma_chan); @@ -1072,10 +1072,10 @@ iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) dma_srcs[i] = dma_map_page(dma_chan->device->dev, zero_sum_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); - tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, - IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, - &zero_sum_result, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs, + IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, + &zero_sum_result, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); cookie = iop_adma_tx_submit(tx); iop_adma_issue_pending(dma_chan); @@ -1192,9 +1192,9 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) dma_dev->max_xor = iop_adma_get_max_xor(); dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor; } - if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask)) - dma_dev->device_prep_dma_zero_sum = - iop_adma_prep_dma_zero_sum; + if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask)) + dma_dev->device_prep_dma_xor_val = + iop_adma_prep_dma_xor_val; if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) dma_dev->device_prep_dma_interrupt = iop_adma_prep_dma_interrupt; @@ -1249,7 +1249,7 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) || dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { - ret = iop_adma_xor_zero_sum_self_test(adev); + ret = iop_adma_xor_val_self_test(adev); dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); if (ret) goto err_free_iop_chan; @@ -1259,10 +1259,10 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) "( %s%s%s%s%s%s%s%s%s%s)\n", dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", - dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "", + dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "", dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "", - dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "", + dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "", dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "", dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 3bbc6d64704..f8d2d35ed29 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -854,7 +854,7 @@ static void ops_run_check(struct stripe_head *sh) xor_srcs[count++] = dev->page; } - tx = async_xor_zero_sum(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, + tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); atomic_inc(&sh->count); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 5fc2ef8d97f..513150d8c25 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -117,7 +117,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * -async_xor_zero_sum(struct page *dest, struct page **src_list, +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, int src_cnt, size_t len, u32 *result, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 2e2aa3df170..6768727d00d 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -55,8 +55,8 @@ enum dma_transaction_type { DMA_PQ_XOR, DMA_DUAL_XOR, DMA_PQ_UPDATE, - DMA_ZERO_SUM, - DMA_PQ_ZERO_SUM, + DMA_XOR_VAL, + DMA_PQ_VAL, DMA_MEMSET, DMA_MEMCPY_CRC32C, DMA_INTERRUPT, @@ -214,7 +214,7 @@ struct dma_async_tx_descriptor { * @device_free_chan_resources: release DMA channel's resources * @device_prep_dma_memcpy: prepares a memcpy operation * @device_prep_dma_xor: prepares a xor operation - * @device_prep_dma_zero_sum: prepares a zero_sum operation + * @device_prep_dma_xor_val: prepares a xor validation operation * @device_prep_dma_memset: prepares a memset operation * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation @@ -243,7 +243,7 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_dma_xor)( struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, unsigned int src_cnt, size_t len, unsigned long flags); - struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)( + struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, size_t len, u32 *result, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( From 88ba2aa586c874681c072101287e15d40de7e6e2 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 9 Apr 2009 16:16:18 -0700 Subject: [PATCH 02/91] async_tx: kill ASYNC_TX_DEP_ACK flag In support of inter-channel chaining async_tx utilizes an ack flag to gate whether a dependent operation can be chained to another. While the flag is not set the chain can be considered open for appending. Setting the ack flag closes the chain and flags the descriptor for garbage collection. The ASYNC_TX_DEP_ACK flag essentially means "close the chain after adding this dependency". Since each operation can only have one child the api now implicitly sets the ack flag at dependency submission time. This removes an unnecessary management burden from clients of the api. [ Impact: clean up and enforce one dependency per operation ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 9 ++++----- crypto/async_tx/async_memcpy.c | 2 +- crypto/async_tx/async_memset.c | 2 +- crypto/async_tx/async_tx.c | 4 ++-- crypto/async_tx/async_xor.c | 6 ++---- drivers/md/raid5.c | 25 +++++++++++-------------- include/linux/async_tx.h | 4 +--- 7 files changed, 22 insertions(+), 30 deletions(-) diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 4af12180d19..76feda8541d 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -80,8 +80,8 @@ acknowledged by the application before the offload engine driver is allowed to recycle (or free) the descriptor. A descriptor can be acked by one of the following methods: 1/ setting the ASYNC_TX_ACK flag if no child operations are to be submitted -2/ setting the ASYNC_TX_DEP_ACK flag to acknowledge the parent - descriptor of a new operation. +2/ submitting an unacknowledged descriptor as a dependency to another + async_tx call will implicitly set the acknowledged state. 3/ calling async_tx_ack() on the descriptor. 3.4 When does the operation execute? @@ -136,10 +136,9 @@ int run_xor_copy_xor(struct page **xor_srcs, tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL); - tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, - ASYNC_TX_DEP_ACK, tx, NULL, NULL); + tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, tx, NULL, NULL); tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST | ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, + ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx, complete_xor_copy_xor, NULL); async_tx_issue_pending_all(); diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index ddccfb01c41..7117ec6f1b7 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -35,7 +35,7 @@ * @src: src page * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK, + * @flags: ASYNC_TX_ACK * @depend_tx: memcpy depends on the result of this transaction * @cb_fn: function to call when the memcpy completes * @cb_param: parameter to pass to the callback routine diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index 5b5eb99bb24..b2f133885b7 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -35,7 +35,7 @@ * @val: fill value * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_ACK * @depend_tx: memset depends on the result of this transaction * @cb_fn: function to call when the memcpy completes * @cb_param: parameter to pass to the callback routine diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 06eb6cc09fe..3766bc3d7d8 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -223,7 +223,7 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, if (flags & ASYNC_TX_ACK) async_tx_ack(tx); - if (depend_tx && (flags & ASYNC_TX_DEP_ACK)) + if (depend_tx) async_tx_ack(depend_tx); } EXPORT_SYMBOL_GPL(async_tx_submit); @@ -231,7 +231,7 @@ EXPORT_SYMBOL_GPL(async_tx_submit); /** * async_trigger_callback - schedules the callback function to be run after * any dependent operations have been completed. - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_ACK * @depend_tx: 'callback' requires the completion of this transaction * @cb_fn: function to call after depend_tx completes * @cb_param: parameter to pass to the callback routine diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index e0580b0ea53..3cc5dc763b5 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -105,7 +105,6 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, _cb_param); depend_tx = tx; - flags |= ASYNC_TX_DEP_ACK; if (src_cnt > xor_src_cnt) { /* drop completed sources */ @@ -168,8 +167,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, * @offset: offset in pages to start transaction * @src_cnt: number of source pages * @len: length in bytes - * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST, - * ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST, ASYNC_TX_ACK * @depend_tx: xor depends on the result of this transaction. * @cb_fn: function to call when the xor completes * @cb_param: parameter to pass to the callback routine @@ -230,7 +228,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) * @src_cnt: number of source pages * @len: length in bytes * @result: 0 if sum == 0 else non-zero - * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK + * @flags: ASYNC_TX_ACK * @depend_tx: xor depends on the result of this transaction. * @cb_fn: function to call when the xor completes * @cb_param: parameter to pass to the callback routine diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index f8d2d35ed29..0ef5362c8d0 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -525,14 +525,12 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, bio_page = bio_iovec_idx(bio, i)->bv_page; if (frombio) tx = async_memcpy(page, bio_page, page_offset, - b_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + b_offset, clen, 0, + tx, NULL, NULL); else tx = async_memcpy(bio_page, page, b_offset, - page_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + page_offset, clen, 0, + tx, NULL, NULL); } if (clen < len) /* hit end of page */ break; @@ -615,8 +613,7 @@ static void ops_run_biofill(struct stripe_head *sh) } atomic_inc(&sh->count); - async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, - ops_complete_biofill, sh); + async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_biofill, sh); } static void ops_complete_compute5(void *stripe_head_ref) @@ -701,8 +698,8 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) } tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh); + ASYNC_TX_XOR_DROP_DST, tx, + ops_complete_prexor, sh); return tx; } @@ -809,7 +806,7 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST * for the synchronous xor case */ - flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | + flags = ASYNC_TX_ACK | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); atomic_inc(&sh->count); @@ -858,7 +855,7 @@ static void ops_run_check(struct stripe_head *sh) &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); atomic_inc(&sh->count); - tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, + tx = async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_check, sh); } @@ -2687,8 +2684,8 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, /* place all the copies on one channel */ tx = async_memcpy(sh2->dev[dd_idx].page, - sh->dev[i].page, 0, 0, STRIPE_SIZE, - ASYNC_TX_DEP_ACK, tx, NULL, NULL); + sh->dev[i].page, 0, 0, STRIPE_SIZE, + 0, tx, NULL, NULL); set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 513150d8c25..9f14cd540cd 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -58,13 +58,11 @@ struct dma_chan_ref { * array. * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain - * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining. */ enum async_tx_flags { ASYNC_TX_XOR_ZERO_DST = (1 << 0), ASYNC_TX_XOR_DROP_DST = (1 << 1), - ASYNC_TX_ACK = (1 << 3), - ASYNC_TX_DEP_ACK = (1 << 4), + ASYNC_TX_ACK = (1 << 2), }; #ifdef CONFIG_DMA_ENGINE From a08abd8ca890a377521d65d493d174bebcaf694b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 3 Jun 2009 11:43:59 -0700 Subject: [PATCH 03/91] async_tx: structify submission arguments, add scribble Prepare the api for the arrival of a new parameter, 'scribble'. This will allow callers to identify scratchpad memory for dma address or page address conversions. As this adds yet another parameter, take this opportunity to convert the common submission parameters (flags, dependency, callback, and callback argument) into an object that is passed by reference. Also, take this opportunity to fix up the kerneldoc and add notes about the relevant ASYNC_TX_* flags for each routine. [ Impact: moves api pass-by-value parameters to a pass-by-reference struct ] Signed-off-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 6 +- crypto/async_tx/async_memcpy.c | 26 +++--- crypto/async_tx/async_memset.c | 25 +++--- crypto/async_tx/async_tx.c | 51 ++++++----- crypto/async_tx/async_xor.c | 123 +++++++++++++------------- drivers/md/raid5.c | 59 ++++++------ include/linux/async_tx.h | 84 +++++++++++------- 7 files changed, 200 insertions(+), 174 deletions(-) diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 76feda8541d..dfe0475f791 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -54,11 +54,7 @@ features surfaced as a result: 3.1 General format of the API: struct dma_async_tx_descriptor * -async_(, - enum async_tx_flags flags, - struct dma_async_tx_descriptor *dependency, - dma_async_tx_callback callback_routine, - void *callback_parameter); +async_(, struct async_submit ctl *submit) 3.2 Supported operations: memcpy - memory copy between a source and a destination buffer diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index 7117ec6f1b7..89e05556f3d 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -33,28 +33,28 @@ * async_memcpy - attempt to copy memory with a dma engine. * @dest: destination page * @src: src page - * @offset: offset in pages to start transaction + * @dest_offset: offset into 'dest' to start transaction + * @src_offset: offset into 'src' to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK - * @depend_tx: memcpy depends on the result of this transaction - * @cb_fn: function to call when the memcpy completes - * @cb_param: parameter to pass to the callback routine + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK */ struct dma_async_tx_descriptor * async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, - unsigned int src_offset, size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + unsigned int src_offset, size_t len, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMCPY, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMCPY, &dest, 1, &src, 1, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; if (device) { dma_addr_t dma_dest, dma_src; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; dma_dest = dma_map_page(device->dev, dest, dest_offset, len, DMA_FROM_DEVICE); @@ -67,13 +67,13 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, if (tx) { pr_debug("%s: (async) len: %zu\n", __func__, len); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { void *dest_buf, *src_buf; pr_debug("%s: (sync) len: %zu\n", __func__, len); /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset; src_buf = kmap_atomic(src, KM_USER1) + src_offset; @@ -83,7 +83,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, kunmap_atomic(dest_buf, KM_USER0); kunmap_atomic(src_buf, KM_USER1); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index b2f133885b7..c14437238f4 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -35,26 +35,23 @@ * @val: fill value * @offset: offset in pages to start transaction * @len: length in bytes - * @flags: ASYNC_TX_ACK - * @depend_tx: memset depends on the result of this transaction - * @cb_fn: function to call when the memcpy completes - * @cb_param: parameter to pass to the callback routine + * + * honored flags: ASYNC_TX_ACK */ struct dma_async_tx_descriptor * -async_memset(struct page *dest, int val, unsigned int offset, - size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) +async_memset(struct page *dest, int val, unsigned int offset, size_t len, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMSET, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_MEMSET, &dest, 1, NULL, 0, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; if (device) { dma_addr_t dma_dest; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; dma_dest = dma_map_page(device->dev, dest, offset, len, DMA_FROM_DEVICE); @@ -64,19 +61,19 @@ async_memset(struct page *dest, int val, unsigned int offset, if (tx) { pr_debug("%s: (async) len: %zu\n", __func__, len); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { /* run the memset synchronously */ void *dest_buf; pr_debug("%s: (sync) len: %zu\n", __func__, len); - dest_buf = (void *) (((char *) page_address(dest)) + offset); + dest_buf = page_address(dest) + offset; /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); memset(dest_buf, val, len); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 3766bc3d7d8..802a5ce437d 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -45,13 +45,15 @@ static void __exit async_tx_exit(void) /** * __async_tx_find_channel - find a channel to carry out the operation or let * the transaction execute synchronously - * @depend_tx: transaction dependency + * @submit: transaction dependency and submission modifiers * @tx_type: transaction type */ struct dma_chan * -__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type) +__async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type) { + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; + /* see if we can keep the chain on one channel */ if (depend_tx && dma_has_cap(tx_type, depend_tx->chan->device->cap_mask)) @@ -144,13 +146,14 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, /** - * submit_disposition - while holding depend_tx->lock we must avoid submitting - * new operations to prevent a circular locking dependency with - * drivers that already hold a channel lock when calling - * async_tx_run_dependencies. + * submit_disposition - flags for routing an incoming operation * @ASYNC_TX_SUBMITTED: we were able to append the new operation under the lock * @ASYNC_TX_CHANNEL_SWITCH: when the lock is dropped schedule a channel switch * @ASYNC_TX_DIRECT_SUBMIT: when the lock is dropped submit directly + * + * while holding depend_tx->lock we must avoid submitting new operations + * to prevent a circular locking dependency with drivers that already + * hold a channel lock when calling async_tx_run_dependencies. */ enum submit_disposition { ASYNC_TX_SUBMITTED, @@ -160,11 +163,12 @@ enum submit_disposition { void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, - enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + struct async_submit_ctl *submit) { - tx->callback = cb_fn; - tx->callback_param = cb_param; + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; + + tx->callback = submit->cb_fn; + tx->callback_param = submit->cb_param; if (depend_tx) { enum submit_disposition s; @@ -220,7 +224,7 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, tx->tx_submit(tx); } - if (flags & ASYNC_TX_ACK) + if (submit->flags & ASYNC_TX_ACK) async_tx_ack(tx); if (depend_tx) @@ -229,21 +233,20 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, EXPORT_SYMBOL_GPL(async_tx_submit); /** - * async_trigger_callback - schedules the callback function to be run after - * any dependent operations have been completed. - * @flags: ASYNC_TX_ACK - * @depend_tx: 'callback' requires the completion of this transaction - * @cb_fn: function to call after depend_tx completes - * @cb_param: parameter to pass to the callback routine + * async_trigger_callback - schedules the callback function to be run + * @submit: submission and completion parameters + * + * honored flags: ASYNC_TX_ACK + * + * The callback is run after any dependent operations have completed. */ struct dma_async_tx_descriptor * -async_trigger_callback(enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) +async_trigger_callback(struct async_submit_ctl *submit) { struct dma_chan *chan; struct dma_device *device; struct dma_async_tx_descriptor *tx; + struct dma_async_tx_descriptor *depend_tx = submit->depend_tx; if (depend_tx) { chan = depend_tx->chan; @@ -262,14 +265,14 @@ async_trigger_callback(enum async_tx_flags flags, if (tx) { pr_debug("%s: (async)\n", __func__); - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { pr_debug("%s: (sync)\n", __func__); /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } return tx; diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 3cc5dc763b5..691fa98a18c 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -34,18 +34,16 @@ static __async_inline struct dma_async_tx_descriptor * do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, unsigned int offset, int src_cnt, size_t len, - enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + struct async_submit_ctl *submit) { struct dma_device *dma = chan->device; dma_addr_t *dma_src = (dma_addr_t *) src_list; struct dma_async_tx_descriptor *tx = NULL; int src_off = 0; int i; - dma_async_tx_callback _cb_fn; - void *_cb_param; - enum async_tx_flags async_flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + void *cb_param_orig = submit->cb_param; + enum async_tx_flags flags_orig = submit->flags; enum dma_ctrl_flags dma_flags; int xor_src_cnt; dma_addr_t dma_dest; @@ -63,7 +61,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, } while (src_cnt) { - async_flags = flags; + submit->flags = flags_orig; dma_flags = 0; xor_src_cnt = min(src_cnt, dma->max_xor); /* if we are submitting additional xors, leave the chain open, @@ -71,15 +69,15 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, * buffer mapped */ if (src_cnt > xor_src_cnt) { - async_flags &= ~ASYNC_TX_ACK; + submit->flags &= ~ASYNC_TX_ACK; dma_flags = DMA_COMPL_SKIP_DEST_UNMAP; - _cb_fn = NULL; - _cb_param = NULL; + submit->cb_fn = NULL; + submit->cb_param = NULL; } else { - _cb_fn = cb_fn; - _cb_param = cb_param; + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; } - if (_cb_fn) + if (submit->cb_fn) dma_flags |= DMA_PREP_INTERRUPT; /* Since we have clobbered the src_list we are committed @@ -90,7 +88,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, xor_src_cnt, len, dma_flags); if (unlikely(!tx)) - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); /* spin wait for the preceeding transactions to complete */ while (unlikely(!tx)) { @@ -101,10 +99,8 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, dma_flags); } - async_tx_submit(chan, tx, async_flags, depend_tx, _cb_fn, - _cb_param); - - depend_tx = tx; + async_tx_submit(chan, tx, submit); + submit->depend_tx = tx; if (src_cnt > xor_src_cnt) { /* drop completed sources */ @@ -123,8 +119,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, static void do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, enum async_tx_flags flags, - dma_async_tx_callback cb_fn, void *cb_param) + int src_cnt, size_t len, struct async_submit_ctl *submit) { int i; int xor_src_cnt; @@ -139,7 +134,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, /* set destination address */ dest_buf = page_address(dest) + offset; - if (flags & ASYNC_TX_XOR_ZERO_DST) + if (submit->flags & ASYNC_TX_XOR_ZERO_DST) memset(dest_buf, 0, len); while (src_cnt > 0) { @@ -152,33 +147,35 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, src_off += xor_src_cnt; } - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); } /** * async_xor - attempt to xor a set of blocks with a dma engine. - * xor_blocks always uses the dest as a source so the ASYNC_TX_XOR_ZERO_DST - * flag must be set to not include dest data in the calculation. The - * assumption with dma eninges is that they only use the destination - * buffer as a source when it is explicity specified in the source list. * @dest: destination page - * @src_list: array of source pages (if the dest is also a source it must be - * at index zero). The contents of this array may be overwritten. - * @offset: offset in pages to start transaction + * @src_list: array of source pages + * @offset: common src/dst offset to start transaction * @src_cnt: number of source pages * @len: length in bytes - * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST, ASYNC_TX_ACK - * @depend_tx: xor depends on the result of this transaction. - * @cb_fn: function to call when the xor completes - * @cb_param: parameter to pass to the callback routine + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK, ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DST + * + * xor_blocks always uses the dest as a source so the + * ASYNC_TX_XOR_ZERO_DST flag must be set to not include dest data in + * the calculation. The assumption with dma eninges is that they only + * use the destination buffer as a source when it is explicity specified + * in the source list. + * + * src_list note: if the dest is also a source it must be at index zero. + * The contents of this array will be overwritten if a scribble region + * is not specified. */ struct dma_async_tx_descriptor * async_xor(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) + int src_cnt, size_t len, struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR, &dest, 1, src_list, src_cnt, len); BUG_ON(src_cnt <= 1); @@ -188,7 +185,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, pr_debug("%s (async): len: %zu\n", __func__, len); return do_async_xor(chan, dest, src_list, offset, src_cnt, len, - flags, depend_tx, cb_fn, cb_param); + submit); } else { /* run the xor synchronously */ pr_debug("%s (sync): len: %zu\n", __func__, len); @@ -196,16 +193,15 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, /* in the sync case the dest is an implied source * (assumes the dest is the first source) */ - if (flags & ASYNC_TX_XOR_DROP_DST) { + if (submit->flags & ASYNC_TX_XOR_DROP_DST) { src_cnt--; src_list++; } /* wait for any prerequisite operations */ - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); - do_sync_xor(dest, src_list, offset, src_cnt, len, - flags, cb_fn, cb_param); + do_sync_xor(dest, src_list, offset, src_cnt, len, submit); return NULL; } @@ -222,25 +218,25 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) /** * async_xor_val - attempt a xor parity check with a dma engine. * @dest: destination page used if the xor is performed synchronously - * @src_list: array of source pages. The dest page must be listed as a source - * at index zero. The contents of this array may be overwritten. + * @src_list: array of source pages * @offset: offset in pages to start transaction * @src_cnt: number of source pages * @len: length in bytes * @result: 0 if sum == 0 else non-zero - * @flags: ASYNC_TX_ACK - * @depend_tx: xor depends on the result of this transaction. - * @cb_fn: function to call when the xor completes - * @cb_param: parameter to pass to the callback routine + * @submit: submission / completion modifiers + * + * honored flags: ASYNC_TX_ACK + * + * src_list note: if the dest is also a source it must be at index zero. + * The contents of this array will be overwritten if a scribble region + * is not specified. */ struct dma_async_tx_descriptor * -async_xor_val(struct page *dest, struct page **src_list, - unsigned int offset, int src_cnt, size_t len, - u32 *result, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_param) +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, u32 *result, + struct async_submit_ctl *submit) { - struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR_VAL, + struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL, &dest, 1, src_list, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; @@ -250,11 +246,12 @@ async_xor_val(struct page *dest, struct page **src_list, if (device && src_cnt <= device->max_xor) { dma_addr_t *dma_src = (dma_addr_t *) src_list; - unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0; + unsigned long dma_prep_flags; int i; pr_debug("%s: (async) len: %zu\n", __func__, len); + dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; for (i = 0; i < src_cnt; i++) dma_src[i] = dma_map_page(device->dev, src_list[i], offset, len, DMA_TO_DEVICE); @@ -263,7 +260,7 @@ async_xor_val(struct page *dest, struct page **src_list, len, result, dma_prep_flags); if (unlikely(!tx)) { - async_tx_quiesce(&depend_tx); + async_tx_quiesce(&submit->depend_tx); while (!tx) { dma_async_issue_pending(chan); @@ -273,23 +270,23 @@ async_xor_val(struct page *dest, struct page **src_list, } } - async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param); + async_tx_submit(chan, tx, submit); } else { - unsigned long xor_flags = flags; + enum async_tx_flags flags_orig = submit->flags; pr_debug("%s: (sync) len: %zu\n", __func__, len); - xor_flags |= ASYNC_TX_XOR_DROP_DST; - xor_flags &= ~ASYNC_TX_ACK; + submit->flags |= ASYNC_TX_XOR_DROP_DST; + submit->flags &= ~ASYNC_TX_ACK; - tx = async_xor(dest, src_list, offset, src_cnt, len, xor_flags, - depend_tx, NULL, NULL); + tx = async_xor(dest, src_list, offset, src_cnt, len, submit); async_tx_quiesce(&tx); *result = page_is_zero(dest, offset, len) ? 0 : 1; - async_tx_sync_epilog(cb_fn, cb_param); + async_tx_sync_epilog(submit); + submit->flags = flags_orig; } return tx; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0ef5362c8d0..e1920f23579 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -499,11 +499,14 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, struct page *bio_page; int i; int page_offset; + struct async_submit_ctl submit; if (bio->bi_sector >= sector) page_offset = (signed)(bio->bi_sector - sector) * 512; else page_offset = (signed)(sector - bio->bi_sector) * -512; + + init_async_submit(&submit, 0, tx, NULL, NULL, NULL); bio_for_each_segment(bvl, bio, i) { int len = bio_iovec_idx(bio, i)->bv_len; int clen; @@ -525,13 +528,14 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, bio_page = bio_iovec_idx(bio, i)->bv_page; if (frombio) tx = async_memcpy(page, bio_page, page_offset, - b_offset, clen, 0, - tx, NULL, NULL); + b_offset, clen, &submit); else tx = async_memcpy(bio_page, page, b_offset, - page_offset, clen, 0, - tx, NULL, NULL); + page_offset, clen, &submit); } + /* chain the operations */ + submit.depend_tx = tx; + if (clen < len) /* hit end of page */ break; page_offset += len; @@ -590,6 +594,7 @@ static void ops_run_biofill(struct stripe_head *sh) { struct dma_async_tx_descriptor *tx = NULL; raid5_conf_t *conf = sh->raid_conf; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu\n", __func__, @@ -613,7 +618,8 @@ static void ops_run_biofill(struct stripe_head *sh) } atomic_inc(&sh->count); - async_trigger_callback(ASYNC_TX_ACK, tx, ops_complete_biofill, sh); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); + async_trigger_callback(&submit); } static void ops_complete_compute5(void *stripe_head_ref) @@ -645,6 +651,7 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) struct page *xor_dest = tgt->page; int count = 0; struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu block: %d\n", @@ -657,13 +664,12 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) atomic_inc(&sh->count); + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + ops_complete_compute5, sh, NULL); if (unlikely(count == 1)) - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - 0, NULL, ops_complete_compute5, sh); + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute5, sh); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } @@ -683,6 +689,7 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) int disks = sh->disks; struct page *xor_srcs[disks]; int count = 0, pd_idx = sh->pd_idx, i; + struct async_submit_ctl submit; /* existing parity data subtracted */ struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; @@ -697,9 +704,9 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) xor_srcs[count++] = dev->page; } - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh); + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, tx, + ops_complete_prexor, sh, NULL); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } @@ -772,7 +779,7 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) /* kernel stack size limits the total number of disks */ int disks = sh->disks; struct page *xor_srcs[disks]; - + struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest; int prexor = 0; @@ -811,13 +818,11 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) atomic_inc(&sh->count); - if (unlikely(count == 1)) { - flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); - } else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); + init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, NULL); + if (unlikely(count == 1)) + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); + else + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); } static void ops_complete_check(void *stripe_head_ref) @@ -838,6 +843,7 @@ static void ops_run_check(struct stripe_head *sh) int disks = sh->disks; struct page *xor_srcs[disks]; struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; @@ -851,12 +857,13 @@ static void ops_run_check(struct stripe_head *sh) xor_srcs[count++] = dev->page; } + init_async_submit(&submit, 0, NULL, NULL, NULL, NULL); tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); + &sh->ops.zero_sum_result, &submit); atomic_inc(&sh->count); - tx = async_trigger_callback(ASYNC_TX_ACK, tx, - ops_complete_check, sh); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); + tx = async_trigger_callback(&submit); } static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) @@ -2664,6 +2671,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, if (i != sh->pd_idx && i != sh->qd_idx) { int dd_idx, j; struct stripe_head *sh2; + struct async_submit_ctl submit; sector_t bn = compute_blocknr(sh, i, 1); sector_t s = raid5_compute_sector(conf, bn, 0, @@ -2683,9 +2691,10 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, } /* place all the copies on one channel */ + init_async_submit(&submit, 0, tx, NULL, NULL, NULL); tx = async_memcpy(sh2->dev[dd_idx].page, sh->dev[i].page, 0, 0, STRIPE_SIZE, - 0, tx, NULL, NULL); + &submit); set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 9f14cd540cd..00cfb637ddf 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -65,6 +65,22 @@ enum async_tx_flags { ASYNC_TX_ACK = (1 << 2), }; +/** + * struct async_submit_ctl - async_tx submission/completion modifiers + * @flags: submission modifiers + * @depend_tx: parent dependency of the current operation being submitted + * @cb_fn: callback routine to run at operation completion + * @cb_param: parameter for the callback routine + * @scribble: caller provided space for dma/page address conversions + */ +struct async_submit_ctl { + enum async_tx_flags flags; + struct dma_async_tx_descriptor *depend_tx; + dma_async_tx_callback cb_fn; + void *cb_param; + void *scribble; +}; + #ifdef CONFIG_DMA_ENGINE #define async_tx_issue_pending_all dma_issue_pending_all #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL @@ -73,8 +89,8 @@ enum async_tx_flags { #define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \ __async_tx_find_channel(dep, type) struct dma_chan * -__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type); +__async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type); #endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */ #else static inline void async_tx_issue_pending_all(void) @@ -83,9 +99,10 @@ static inline void async_tx_issue_pending_all(void) } static inline struct dma_chan * -async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, - enum dma_transaction_type tx_type, struct page **dst, int dst_count, - struct page **src, int src_count, size_t len) +async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type, struct page **dst, + int dst_count, struct page **src, int src_count, + size_t len) { return NULL; } @@ -97,46 +114,53 @@ async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, * @cb_fn_param: parameter to pass to the callback routine */ static inline void -async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param) +async_tx_sync_epilog(struct async_submit_ctl *submit) { - if (cb_fn) - cb_fn(cb_fn_param); + if (submit->cb_fn) + submit->cb_fn(submit->cb_param); } -void -async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, - enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); +typedef union { + unsigned long addr; + struct page *page; + dma_addr_t dma; +} addr_conv_t; + +static inline void +init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags, + struct dma_async_tx_descriptor *tx, + dma_async_tx_callback cb_fn, void *cb_param, + addr_conv_t *scribble) +{ + args->flags = flags; + args->depend_tx = tx; + args->cb_fn = cb_fn; + args->cb_param = cb_param; + args->scribble = scribble; +} + +void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, + struct async_submit_ctl *submit); struct dma_async_tx_descriptor * async_xor(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); + int src_cnt, size_t len, struct async_submit_ctl *submit); struct dma_async_tx_descriptor * -async_xor_val(struct page *dest, struct page **src_list, - unsigned int offset, int src_cnt, size_t len, - u32 *result, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, u32 *result, + struct async_submit_ctl *submit); struct dma_async_tx_descriptor * async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, - unsigned int src_offset, size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); + unsigned int src_offset, size_t len, + struct async_submit_ctl *submit); struct dma_async_tx_descriptor * async_memset(struct page *dest, int val, unsigned int offset, - size_t len, enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); + size_t len, struct async_submit_ctl *submit); -struct dma_async_tx_descriptor * -async_trigger_callback(enum async_tx_flags flags, - struct dma_async_tx_descriptor *depend_tx, - dma_async_tx_callback cb_fn, void *cb_fn_param); +struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ From 04ce9ab385dc97eb55299d533cd3af79b8fc7529 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 3 Jun 2009 14:22:28 -0700 Subject: [PATCH 04/91] async_xor: permit callers to pass in a 'dma/page scribble' region async_xor() needs space to perform dma and page address conversions. In most cases the code can simply reuse the struct page * array because the size of the native pointer matches the size of a dma/page address. In order to support archs where sizeof(dma_addr_t) is larger than sizeof(struct page *), or to preserve the input parameters, we utilize a memory region passed in by the caller. Since the code is now prepared to handle the case where it cannot perform address conversions on the stack, we no longer need the !HIGHMEM64G dependency in drivers/dma/Kconfig. [ Impact: don't clobber input buffers for address conversions ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 43 ++++++++++++------- crypto/async_tx/async_xor.c | 60 +++++++++++++-------------- drivers/dma/Kconfig | 2 +- 3 files changed, 58 insertions(+), 47 deletions(-) diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index dfe0475f791..6b15e488c0e 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -115,29 +115,42 @@ of an operation. Perform a xor->copy->xor operation where each operation depends on the result from the previous operation: -void complete_xor_copy_xor(void *param) +void callback(void *param) { - printk("complete\n"); + struct completion *cmp = param; + + complete(cmp); } -int run_xor_copy_xor(struct page **xor_srcs, - int xor_src_cnt, - struct page *xor_dest, - size_t xor_len, - struct page *copy_src, - struct page *copy_dest, - size_t copy_len) +void run_xor_copy_xor(struct page **xor_srcs, + int xor_src_cnt, + struct page *xor_dest, + size_t xor_len, + struct page *copy_src, + struct page *copy_dest, + size_t copy_len) { struct dma_async_tx_descriptor *tx; + addr_conv_t addr_conv[xor_src_cnt]; + struct async_submit_ctl submit; + addr_conv_t addr_conv[NDISKS]; + struct completion cmp; - tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL); - tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, tx, NULL, NULL); - tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, - ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, - tx, complete_xor_copy_xor, NULL); + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL, + addr_conv); + tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit) + + submit->depend_tx = tx; + tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, &submit); + + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx, + callback, &cmp, addr_conv); + tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit); async_tx_issue_pending_all(); + + wait_for_completion(&cmp); } See include/linux/async_tx.h for more information on the flags. See the diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 691fa98a18c..1e96c4df706 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -33,11 +33,10 @@ /* do_async_xor - dma map the pages and perform the xor with an engine */ static __async_inline struct dma_async_tx_descriptor * do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, - unsigned int offset, int src_cnt, size_t len, + unsigned int offset, int src_cnt, size_t len, dma_addr_t *dma_src, struct async_submit_ctl *submit) { struct dma_device *dma = chan->device; - dma_addr_t *dma_src = (dma_addr_t *) src_list; struct dma_async_tx_descriptor *tx = NULL; int src_off = 0; int i; @@ -125,9 +124,14 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset, int xor_src_cnt; int src_off = 0; void *dest_buf; - void **srcs = (void **) src_list; + void **srcs; - /* reuse the 'src_list' array to convert to buffer pointers */ + if (submit->scribble) + srcs = submit->scribble; + else + srcs = (void **) src_list; + + /* convert to buffer pointers */ for (i = 0; i < src_cnt; i++) srcs[i] = page_address(src_list[i]) + offset; @@ -178,17 +182,26 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR, &dest, 1, src_list, src_cnt, len); + dma_addr_t *dma_src = NULL; + BUG_ON(src_cnt <= 1); - if (chan) { + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) src_list; + + if (dma_src && chan) { /* run the xor asynchronously */ pr_debug("%s (async): len: %zu\n", __func__, len); return do_async_xor(chan, dest, src_list, offset, src_cnt, len, - submit); + dma_src, submit); } else { /* run the xor synchronously */ pr_debug("%s (sync): len: %zu\n", __func__, len); + WARN_ONCE(chan, "%s: no space for dma address conversion\n", + __func__); /* in the sync case the dest is an implied source * (assumes the dest is the first source) @@ -241,11 +254,16 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, src_cnt, len); struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; + dma_addr_t *dma_src = NULL; BUG_ON(src_cnt <= 1); - if (device && src_cnt <= device->max_xor) { - dma_addr_t *dma_src = (dma_addr_t *) src_list; + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) src_list; + + if (dma_src && device && src_cnt <= device->max_xor) { unsigned long dma_prep_flags; int i; @@ -275,6 +293,9 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, enum async_tx_flags flags_orig = submit->flags; pr_debug("%s: (sync) len: %zu\n", __func__, len); + WARN_ONCE(device && src_cnt <= device->max_xor, + "%s: no space for dma address conversion\n", + __func__); submit->flags |= ASYNC_TX_XOR_DROP_DST; submit->flags &= ~ASYNC_TX_ACK; @@ -293,29 +314,6 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, } EXPORT_SYMBOL_GPL(async_xor_val); -static int __init async_xor_init(void) -{ - #ifdef CONFIG_DMA_ENGINE - /* To conserve stack space the input src_list (array of page pointers) - * is reused to hold the array of dma addresses passed to the driver. - * This conversion is only possible when dma_addr_t is less than the - * the size of a pointer. HIGHMEM64G is known to violate this - * assumption. - */ - BUILD_BUG_ON(sizeof(dma_addr_t) > sizeof(struct page *)); - #endif - - return 0; -} - -static void __exit async_xor_exit(void) -{ - do { } while (0); -} - -module_init(async_xor_init); -module_exit(async_xor_exit); - MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("asynchronous xor/xor-zero-sum api"); MODULE_LICENSE("GPL"); diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 3b3c01b6f1e..912a51b5cbd 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -4,7 +4,7 @@ menuconfig DMADEVICES bool "DMA Engine support" - depends on !HIGHMEM64G && HAS_DMA + depends on HAS_DMA help DMA engines can do asynchronous data transfers without involving the host CPU. Currently, this framework can be From a11034b4282515fd7d9f6fdc0a1380781da461c3 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 11:48:16 -0700 Subject: [PATCH 05/91] md/raid6: release spare page at ->stop() Add missing call to safe_put_page from stop() by unifying open coded raid5_conf_t de-allocation under free_conf(). Signed-off-by: Dan Williams --- drivers/md/raid5.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index e1920f23579..9411466f71d 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4309,6 +4309,15 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) return sectors * (raid_disks - conf->max_degraded); } +static void free_conf(raid5_conf_t *conf) +{ + shrink_stripes(conf); + safe_put_page(conf->spare_page); + kfree(conf->disks); + kfree(conf->stripe_hashtbl); + kfree(conf); +} + static raid5_conf_t *setup_conf(mddev_t *mddev) { raid5_conf_t *conf; @@ -4438,11 +4447,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) abort: if (conf) { - shrink_stripes(conf); - safe_put_page(conf->spare_page); - kfree(conf->disks); - kfree(conf->stripe_hashtbl); - kfree(conf); + free_conf(conf); return ERR_PTR(-EIO); } else return ERR_PTR(-ENOMEM); @@ -4608,12 +4613,8 @@ abort: md_unregister_thread(mddev->thread); mddev->thread = NULL; if (conf) { - shrink_stripes(conf); print_raid5_conf(conf); - safe_put_page(conf->spare_page); - kfree(conf->disks); - kfree(conf->stripe_hashtbl); - kfree(conf); + free_conf(conf); } mddev->private = NULL; printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev)); @@ -4628,13 +4629,10 @@ static int stop(mddev_t *mddev) md_unregister_thread(mddev->thread); mddev->thread = NULL; - shrink_stripes(conf); - kfree(conf->stripe_hashtbl); mddev->queue->backing_dev_info.congested_fn = NULL; blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ sysfs_remove_group(&mddev->kobj, &raid5_attrs_group); - kfree(conf->disks); - kfree(conf); + free_conf(conf); mddev->private = NULL; return 0; } From 584ec22759c06cdfc189c03a727f20038526245b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:32:12 -0700 Subject: [PATCH 06/91] ioat: move to drivers/dma/ioat/ When first created the ioat driver was the only inhabitant of drivers/dma/. Now, it is the only multi-file (more than a .c and a .h) driver in the directory. Moving it to an ioat/ subdirectory allows the naming convention to be cleaned up, and allows for future splitting of the source files by hardware version (v1, v2, and v3). Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/Makefile | 3 +-- drivers/dma/ioat/Makefile | 2 ++ drivers/dma/{ioat_dca.c => ioat/dca.c} | 4 ++-- drivers/dma/{ioat_dma.c => ioat/dma.c} | 6 +++--- drivers/dma/{ioatdma.h => ioat/dma.h} | 2 +- drivers/dma/{ioatdma_hw.h => ioat/hw.h} | 0 drivers/dma/{ioat.c => ioat/pci.c} | 6 +++--- drivers/dma/{ioatdma_registers.h => ioat/registers.h} | 0 drivers/idle/i7300_idle.c | 4 ++-- 9 files changed, 14 insertions(+), 13 deletions(-) create mode 100644 drivers/dma/ioat/Makefile rename drivers/dma/{ioat_dca.c => ioat/dca.c} (99%) rename drivers/dma/{ioat_dma.c => ioat/dma.c} (99%) rename drivers/dma/{ioatdma.h => ioat/dma.h} (99%) rename drivers/dma/{ioatdma_hw.h => ioat/hw.h} (100%) rename drivers/dma/{ioat.c => ioat/pci.c} (98%) rename drivers/dma/{ioatdma_registers.h => ioat/registers.h} (100%) diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 2e5dc96700d..a1cb2857bba 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -1,8 +1,7 @@ obj-$(CONFIG_DMA_ENGINE) += dmaengine.o obj-$(CONFIG_NET_DMA) += iovlock.o obj-$(CONFIG_DMATEST) += dmatest.o -obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o -ioatdma-objs := ioat.o ioat_dma.o ioat_dca.o +obj-$(CONFIG_INTEL_IOATDMA) += ioat/ obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o obj-$(CONFIG_FSL_DMA) += fsldma.o obj-$(CONFIG_MV_XOR) += mv_xor.o diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile new file mode 100644 index 00000000000..2ce3d3a4270 --- /dev/null +++ b/drivers/dma/ioat/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o +ioatdma-objs := pci.o dma.o dca.o diff --git a/drivers/dma/ioat_dca.c b/drivers/dma/ioat/dca.c similarity index 99% rename from drivers/dma/ioat_dca.c rename to drivers/dma/ioat/dca.c index c012a1e1504..af1c762dd9d 100644 --- a/drivers/dma/ioat_dca.c +++ b/drivers/dma/ioat/dca.c @@ -33,8 +33,8 @@ #define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24) #endif -#include "ioatdma.h" -#include "ioatdma_registers.h" +#include "dma.h" +#include "registers.h" /* * Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6 diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat/dma.c similarity index 99% rename from drivers/dma/ioat_dma.c rename to drivers/dma/ioat/dma.c index a600fc0f796..648797e8329 100644 --- a/drivers/dma/ioat_dma.c +++ b/drivers/dma/ioat/dma.c @@ -34,9 +34,9 @@ #include #include #include -#include "ioatdma.h" -#include "ioatdma_registers.h" -#include "ioatdma_hw.h" +#include "dma.h" +#include "registers.h" +#include "hw.h" #define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioat/dma.h similarity index 99% rename from drivers/dma/ioatdma.h rename to drivers/dma/ioat/dma.h index a52ff4bd460..e80e787fe64 100644 --- a/drivers/dma/ioatdma.h +++ b/drivers/dma/ioat/dma.h @@ -22,7 +22,7 @@ #define IOATDMA_H #include -#include "ioatdma_hw.h" +#include "hw.h" #include #include #include diff --git a/drivers/dma/ioatdma_hw.h b/drivers/dma/ioat/hw.h similarity index 100% rename from drivers/dma/ioatdma_hw.h rename to drivers/dma/ioat/hw.h diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat/pci.c similarity index 98% rename from drivers/dma/ioat.c rename to drivers/dma/ioat/pci.c index 2225bb6ba3d..d7948bfd8fb 100644 --- a/drivers/dma/ioat.c +++ b/drivers/dma/ioat/pci.c @@ -30,9 +30,9 @@ #include #include #include -#include "ioatdma.h" -#include "ioatdma_registers.h" -#include "ioatdma_hw.h" +#include "dma.h" +#include "registers.h" +#include "hw.h" MODULE_VERSION(IOAT_DMA_VERSION); MODULE_LICENSE("GPL"); diff --git a/drivers/dma/ioatdma_registers.h b/drivers/dma/ioat/registers.h similarity index 100% rename from drivers/dma/ioatdma_registers.h rename to drivers/dma/ioat/registers.h diff --git a/drivers/idle/i7300_idle.c b/drivers/idle/i7300_idle.c index 949c97ff57e..f2ec7243549 100644 --- a/drivers/idle/i7300_idle.c +++ b/drivers/idle/i7300_idle.c @@ -29,8 +29,8 @@ #include -#include "../dma/ioatdma_hw.h" -#include "../dma/ioatdma_registers.h" +#include "../dma/ioat/hw.h" +#include "../dma/ioat/registers.h" #define I7300_IDLE_DRIVER_VERSION "1.55" #define I7300_PRINT "i7300_idle:" From 36d1c6476be51101778882897b315bd928c8c7b5 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 11:48:22 -0700 Subject: [PATCH 07/91] md/raid6: move the spare page to a percpu allocation In preparation for asynchronous handling of raid6 operations move the spare page to a percpu allocation to allow multiple simultaneous synchronous raid6 recovery operations. Make this allocation cpu hotplug aware to maximize allocation efficiency. Signed-off-by: Dan Williams --- drivers/md/raid5.c | 260 ++++++++++++++++++++++++++++++--------------- drivers/md/raid5.h | 9 +- 2 files changed, 179 insertions(+), 90 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9411466f71d..5359236a1ec 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -48,6 +48,7 @@ #include #include #include +#include #include "md.h" #include "raid5.h" #include "bitmap.h" @@ -2565,14 +2566,15 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, - struct stripe_head_state *s, - struct r6_state *r6s, struct page *tmp_page, - int disks) + struct stripe_head_state *s, + struct r6_state *r6s, int disks) { int update_p = 0, update_q = 0; struct r5dev *dev; int pd_idx = sh->pd_idx; int qd_idx = sh->qd_idx; + unsigned long cpu; + struct page *tmp_page; set_bit(STRIPE_HANDLE, &sh->state); @@ -2583,78 +2585,75 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, * case we can only check one of them, possibly using the * other to generate missing data */ - - /* If !tmp_page, we cannot do the calculations, - * but as we have set STRIPE_HANDLE, we will soon be called - * by stripe_handle with a tmp_page - just wait until then. - */ - if (tmp_page) { - if (s->failed == r6s->q_failed) { - /* The only possible failed device holds 'Q', so it - * makes sense to check P (If anything else were failed, - * we would have used P to recreate it). - */ - compute_block_1(sh, pd_idx, 1); - if (!page_is_zero(sh->dev[pd_idx].page)) { - compute_block_1(sh, pd_idx, 0); - update_p = 1; - } - } - if (!r6s->q_failed && s->failed < 2) { - /* q is not failed, and we didn't use it to generate - * anything, so it makes sense to check it - */ - memcpy(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE); - compute_parity6(sh, UPDATE_PARITY); - if (memcmp(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE) != 0) { - clear_bit(STRIPE_INSYNC, &sh->state); - update_q = 1; - } - } - if (update_p || update_q) { - conf->mddev->resync_mismatches += STRIPE_SECTORS; - if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) - /* don't try to repair!! */ - update_p = update_q = 0; - } - - /* now write out any block on a failed drive, - * or P or Q if they need it + cpu = get_cpu(); + tmp_page = per_cpu_ptr(conf->percpu, cpu)->spare_page; + if (s->failed == r6s->q_failed) { + /* The only possible failed device holds 'Q', so it + * makes sense to check P (If anything else were failed, + * we would have used P to recreate it). */ - - if (s->failed == 2) { - dev = &sh->dev[r6s->failed_num[1]]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); + compute_block_1(sh, pd_idx, 1); + if (!page_is_zero(sh->dev[pd_idx].page)) { + compute_block_1(sh, pd_idx, 0); + update_p = 1; } - if (s->failed >= 1) { - dev = &sh->dev[r6s->failed_num[0]]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - - if (update_p) { - dev = &sh->dev[pd_idx]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - if (update_q) { - dev = &sh->dev[qd_idx]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - clear_bit(STRIPE_DEGRADED, &sh->state); - - set_bit(STRIPE_INSYNC, &sh->state); } + if (!r6s->q_failed && s->failed < 2) { + /* q is not failed, and we didn't use it to generate + * anything, so it makes sense to check it + */ + memcpy(page_address(tmp_page), + page_address(sh->dev[qd_idx].page), + STRIPE_SIZE); + compute_parity6(sh, UPDATE_PARITY); + if (memcmp(page_address(tmp_page), + page_address(sh->dev[qd_idx].page), + STRIPE_SIZE) != 0) { + clear_bit(STRIPE_INSYNC, &sh->state); + update_q = 1; + } + } + put_cpu(); + + if (update_p || update_q) { + conf->mddev->resync_mismatches += STRIPE_SECTORS; + if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) + /* don't try to repair!! */ + update_p = update_q = 0; + } + + /* now write out any block on a failed drive, + * or P or Q if they need it + */ + + if (s->failed == 2) { + dev = &sh->dev[r6s->failed_num[1]]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + if (s->failed >= 1) { + dev = &sh->dev[r6s->failed_num[0]]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + + if (update_p) { + dev = &sh->dev[pd_idx]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + if (update_q) { + dev = &sh->dev[qd_idx]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + clear_bit(STRIPE_DEGRADED, &sh->state); + + set_bit(STRIPE_INSYNC, &sh->state); } static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, @@ -3009,7 +3008,7 @@ static bool handle_stripe5(struct stripe_head *sh) return blocked_rdev == NULL; } -static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) +static bool handle_stripe6(struct stripe_head *sh) { raid5_conf_t *conf = sh->raid_conf; int disks = sh->disks; @@ -3164,7 +3163,7 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) * data is available */ if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) - handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); + handle_parity_checks6(conf, sh, &s, &r6s, disks); if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { md_done_sync(conf->mddev, STRIPE_SECTORS,1); @@ -3247,16 +3246,14 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) } /* returns true if the stripe was handled */ -static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page) +static bool handle_stripe(struct stripe_head *sh) { if (sh->raid_conf->level == 6) - return handle_stripe6(sh, tmp_page); + return handle_stripe6(sh); else return handle_stripe5(sh); } - - static void raid5_activate_delayed(raid5_conf_t *conf) { if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { @@ -4047,7 +4044,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski spin_unlock(&sh->lock); /* wait for any blocked device to be handled */ - while(unlikely(!handle_stripe(sh, NULL))) + while (unlikely(!handle_stripe(sh))) ; release_stripe(sh); @@ -4104,7 +4101,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) return handled; } - handle_stripe(sh, NULL); + handle_stripe(sh); release_stripe(sh); handled++; } @@ -4168,7 +4165,7 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); handled++; - handle_stripe(sh, conf->spare_page); + handle_stripe(sh); release_stripe(sh); spin_lock_irq(&conf->device_lock); @@ -4309,15 +4306,104 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) return sectors * (raid_disks - conf->max_degraded); } +static void raid5_free_percpu(raid5_conf_t *conf) +{ + struct raid5_percpu *percpu; + unsigned long cpu; + + if (!conf->percpu) + return; + + get_online_cpus(); + for_each_possible_cpu(cpu) { + percpu = per_cpu_ptr(conf->percpu, cpu); + safe_put_page(percpu->spare_page); + } +#ifdef CONFIG_HOTPLUG_CPU + unregister_cpu_notifier(&conf->cpu_notify); +#endif + put_online_cpus(); + + free_percpu(conf->percpu); +} + static void free_conf(raid5_conf_t *conf) { shrink_stripes(conf); - safe_put_page(conf->spare_page); + raid5_free_percpu(conf); kfree(conf->disks); kfree(conf->stripe_hashtbl); kfree(conf); } +#ifdef CONFIG_HOTPLUG_CPU +static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, + void *hcpu) +{ + raid5_conf_t *conf = container_of(nfb, raid5_conf_t, cpu_notify); + long cpu = (long)hcpu; + struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); + + switch (action) { + case CPU_UP_PREPARE: + case CPU_UP_PREPARE_FROZEN: + if (!percpu->spare_page) + percpu->spare_page = alloc_page(GFP_KERNEL); + if (!percpu->spare_page) { + pr_err("%s: failed memory allocation for cpu%ld\n", + __func__, cpu); + return NOTIFY_BAD; + } + break; + case CPU_DEAD: + case CPU_DEAD_FROZEN: + safe_put_page(percpu->spare_page); + percpu->spare_page = NULL; + break; + default: + break; + } + return NOTIFY_OK; +} +#endif + +static int raid5_alloc_percpu(raid5_conf_t *conf) +{ + unsigned long cpu; + struct page *spare_page; + struct raid5_percpu *allcpus; + int err; + + /* the only percpu data is the raid6 spare page */ + if (conf->level != 6) + return 0; + + allcpus = alloc_percpu(struct raid5_percpu); + if (!allcpus) + return -ENOMEM; + conf->percpu = allcpus; + + get_online_cpus(); + err = 0; + for_each_present_cpu(cpu) { + spare_page = alloc_page(GFP_KERNEL); + if (!spare_page) { + err = -ENOMEM; + break; + } + per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; + } +#ifdef CONFIG_HOTPLUG_CPU + conf->cpu_notify.notifier_call = raid456_cpu_notify; + conf->cpu_notify.priority = 0; + if (err == 0) + err = register_cpu_notifier(&conf->cpu_notify); +#endif + put_online_cpus(); + + return err; +} + static raid5_conf_t *setup_conf(mddev_t *mddev) { raid5_conf_t *conf; @@ -4372,11 +4458,10 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) goto abort; - if (mddev->new_level == 6) { - conf->spare_page = alloc_page(GFP_KERNEL); - if (!conf->spare_page) - goto abort; - } + conf->level = mddev->new_level; + if (raid5_alloc_percpu(conf) != 0) + goto abort; + spin_lock_init(&conf->device_lock); init_waitqueue_head(&conf->wait_for_stripe); init_waitqueue_head(&conf->wait_for_overlap); @@ -4412,7 +4497,6 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) } conf->chunk_size = mddev->new_chunk; - conf->level = mddev->new_level; if (conf->level == 6) conf->max_degraded = 2; else diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 52ba99954de..07a7a4102f0 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -383,8 +383,13 @@ struct raid5_private_data { * (fresh device added). * Cleared when a sync completes. */ - - struct page *spare_page; /* Used when checking P/Q in raid6 */ + /* per cpu variables */ + struct raid5_percpu { + struct page *spare_page; /* Used when checking P/Q in raid6 */ + } *percpu; +#ifdef CONFIG_HOTPLUG_CPU + struct notifier_block cpu_notify; +#endif /* * Free stripes pool From d6f38f31f3ad4b0dd33fe970988f14e7c65ef702 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 11:50:52 -0700 Subject: [PATCH 08/91] md/raid5,6: add percpu scribble region for buffer lists Use percpu memory rather than stack for storing the buffer lists used in parity calculations. Include space for dma address conversions and pass that to async_tx via the async_submit_ctl.scribble pointer. [ Impact: move memory pressure from stack to heap ] Signed-off-by: Dan Williams --- drivers/md/raid5.c | 132 ++++++++++++++++++++++++++++++++++----------- drivers/md/raid5.h | 8 +++ 2 files changed, 110 insertions(+), 30 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 5359236a1ec..7727954cf72 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -642,11 +642,18 @@ static void ops_complete_compute5(void *stripe_head_ref) release_stripe(sh); } -static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) +/* return a pointer to the address conversion region of the scribble buffer */ +static addr_conv_t *to_addr_conv(struct stripe_head *sh, + struct raid5_percpu *percpu) +{ + return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); +} + +static struct dma_async_tx_descriptor * +ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; int target = sh->ops.target; struct r5dev *tgt = &sh->dev[target]; struct page *xor_dest = tgt->page; @@ -666,7 +673,7 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) atomic_inc(&sh->count); init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute5, sh, NULL); + ops_complete_compute5, sh, to_addr_conv(sh, percpu)); if (unlikely(count == 1)) tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else @@ -684,11 +691,11 @@ static void ops_complete_prexor(void *stripe_head_ref) } static struct dma_async_tx_descriptor * -ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) +ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; int count = 0, pd_idx = sh->pd_idx, i; struct async_submit_ctl submit; @@ -706,7 +713,7 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) } init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh, NULL); + ops_complete_prexor, sh, to_addr_conv(sh, percpu)); tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; @@ -775,11 +782,11 @@ static void ops_complete_postxor(void *stripe_head_ref) } static void -ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) +ops_run_postxor(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest; @@ -819,7 +826,8 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) atomic_inc(&sh->count); - init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, NULL); + init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, + to_addr_conv(sh, percpu)); if (unlikely(count == 1)) tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else @@ -838,11 +846,10 @@ static void ops_complete_check(void *stripe_head_ref) release_stripe(sh); } -static void ops_run_check(struct stripe_head *sh) +static void ops_run_check(struct stripe_head *sh, struct raid5_percpu *percpu) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; struct dma_async_tx_descriptor *tx; struct async_submit_ctl submit; @@ -858,7 +865,8 @@ static void ops_run_check(struct stripe_head *sh) xor_srcs[count++] = dev->page; } - init_async_submit(&submit, 0, NULL, NULL, NULL, NULL); + init_async_submit(&submit, 0, NULL, NULL, NULL, + to_addr_conv(sh, percpu)); tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &sh->ops.zero_sum_result, &submit); @@ -871,21 +879,26 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) { int overlap_clear = 0, i, disks = sh->disks; struct dma_async_tx_descriptor *tx = NULL; + raid5_conf_t *conf = sh->raid_conf; + struct raid5_percpu *percpu; + unsigned long cpu; + cpu = get_cpu(); + percpu = per_cpu_ptr(conf->percpu, cpu); if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { ops_run_biofill(sh); overlap_clear++; } if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { - tx = ops_run_compute5(sh); + tx = ops_run_compute5(sh, percpu); /* terminate the chain if postxor is not set to be run */ if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) async_tx_ack(tx); } if (test_bit(STRIPE_OP_PREXOR, &ops_request)) - tx = ops_run_prexor(sh, tx); + tx = ops_run_prexor(sh, percpu, tx); if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { tx = ops_run_biodrain(sh, tx); @@ -893,10 +906,10 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) } if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) - ops_run_postxor(sh, tx); + ops_run_postxor(sh, percpu, tx); if (test_bit(STRIPE_OP_CHECK, &ops_request)) - ops_run_check(sh); + ops_run_check(sh, percpu); if (overlap_clear) for (i = disks; i--; ) { @@ -904,6 +917,7 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) if (test_and_clear_bit(R5_Overlap, &dev->flags)) wake_up(&sh->raid_conf->wait_for_overlap); } + put_cpu(); } static int grow_one_stripe(raid5_conf_t *conf) @@ -953,6 +967,28 @@ static int grow_stripes(raid5_conf_t *conf, int num) return 0; } +/** + * scribble_len - return the required size of the scribble region + * @num - total number of disks in the array + * + * The size must be enough to contain: + * 1/ a struct page pointer for each device in the array +2 + * 2/ room to convert each entry in (1) to its corresponding dma + * (dma_map_page()) or page (page_address()) address. + * + * Note: the +2 is for the destination buffers of the ddf/raid6 case where we + * calculate over all devices (not just the data blocks), using zeros in place + * of the P and Q blocks. + */ +static size_t scribble_len(int num) +{ + size_t len; + + len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); + + return len; +} + static int resize_stripes(raid5_conf_t *conf, int newsize) { /* Make all the stripes able to hold 'newsize' devices. @@ -981,6 +1017,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) struct stripe_head *osh, *nsh; LIST_HEAD(newstripes); struct disk_info *ndisks; + unsigned long cpu; int err; struct kmem_cache *sc; int i; @@ -1046,7 +1083,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) /* Step 3. * At this point, we are holding all the stripes so the array * is completely stalled, so now is a good time to resize - * conf->disks. + * conf->disks and the scribble region */ ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); if (ndisks) { @@ -1057,10 +1094,30 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) } else err = -ENOMEM; + get_online_cpus(); + conf->scribble_len = scribble_len(newsize); + for_each_present_cpu(cpu) { + struct raid5_percpu *percpu; + void *scribble; + + percpu = per_cpu_ptr(conf->percpu, cpu); + scribble = kmalloc(conf->scribble_len, GFP_NOIO); + + if (scribble) { + kfree(percpu->scribble); + percpu->scribble = scribble; + } else { + err = -ENOMEM; + break; + } + } + put_online_cpus(); + /* Step 4, return new stripes to service */ while(!list_empty(&newstripes)) { nsh = list_entry(newstripes.next, struct stripe_head, lru); list_del_init(&nsh->lru); + for (i=conf->raid_disks; i < newsize; i++) if (nsh->dev[i].page == NULL) { struct page *p = alloc_page(GFP_NOIO); @@ -4318,6 +4375,7 @@ static void raid5_free_percpu(raid5_conf_t *conf) for_each_possible_cpu(cpu) { percpu = per_cpu_ptr(conf->percpu, cpu); safe_put_page(percpu->spare_page); + kfree(percpu->scribble); } #ifdef CONFIG_HOTPLUG_CPU unregister_cpu_notifier(&conf->cpu_notify); @@ -4347,9 +4405,15 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, switch (action) { case CPU_UP_PREPARE: case CPU_UP_PREPARE_FROZEN: - if (!percpu->spare_page) + if (conf->level == 6 && !percpu->spare_page) percpu->spare_page = alloc_page(GFP_KERNEL); - if (!percpu->spare_page) { + if (!percpu->scribble) + percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); + + if (!percpu->scribble || + (conf->level == 6 && !percpu->spare_page)) { + safe_put_page(percpu->spare_page); + kfree(percpu->scribble); pr_err("%s: failed memory allocation for cpu%ld\n", __func__, cpu); return NOTIFY_BAD; @@ -4358,7 +4422,9 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, case CPU_DEAD: case CPU_DEAD_FROZEN: safe_put_page(percpu->spare_page); + kfree(percpu->scribble); percpu->spare_page = NULL; + percpu->scribble = NULL; break; default: break; @@ -4372,12 +4438,9 @@ static int raid5_alloc_percpu(raid5_conf_t *conf) unsigned long cpu; struct page *spare_page; struct raid5_percpu *allcpus; + void *scribble; int err; - /* the only percpu data is the raid6 spare page */ - if (conf->level != 6) - return 0; - allcpus = alloc_percpu(struct raid5_percpu); if (!allcpus) return -ENOMEM; @@ -4386,12 +4449,20 @@ static int raid5_alloc_percpu(raid5_conf_t *conf) get_online_cpus(); err = 0; for_each_present_cpu(cpu) { - spare_page = alloc_page(GFP_KERNEL); - if (!spare_page) { + if (conf->level == 6) { + spare_page = alloc_page(GFP_KERNEL); + if (!spare_page) { + err = -ENOMEM; + break; + } + per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; + } + scribble = kmalloc(scribble_len(conf->raid_disks), GFP_KERNEL); + if (!scribble) { err = -ENOMEM; break; } - per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; + per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; } #ifdef CONFIG_HOTPLUG_CPU conf->cpu_notify.notifier_call = raid456_cpu_notify; @@ -4443,6 +4514,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) goto abort; conf->raid_disks = mddev->raid_disks; + conf->scribble_len = scribble_len(conf->raid_disks); if (mddev->reshape_position == MaxSector) conf->previous_raid_disks = mddev->raid_disks; else diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 07a7a4102f0..e7baabffee8 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -386,7 +386,15 @@ struct raid5_private_data { /* per cpu variables */ struct raid5_percpu { struct page *spare_page; /* Used when checking P/Q in raid6 */ + void *scribble; /* space for constructing buffer + * lists and performing address + * conversions + */ } *percpu; + size_t scribble_len; /* size of scribble region must be + * associated with conf to handle + * cpu hotplug while reshaping + */ #ifdef CONFIG_HOTPLUG_CPU struct notifier_block cpu_notify; #endif From ad283ea4a3ce82cda2efe33163748a397b31b1eb Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:09:26 -0700 Subject: [PATCH 09/91] async_tx: add sum check flags Replace the flat zero_sum_result with a collection of flags to contain the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed solomon syndrome) zero-sum result. Use the SUM_CHECK_ namespace instead of DMA_ since these flags will be used on non-dma-zero-sum enabled platforms. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- arch/arm/include/asm/hardware/iop3xx-adma.h | 5 +++-- arch/arm/mach-iop13xx/include/mach/adma.h | 12 +++++++----- crypto/async_tx/async_xor.c | 4 ++-- drivers/md/raid5.c | 2 +- drivers/md/raid5.h | 5 +++-- include/linux/async_tx.h | 2 +- include/linux/dmaengine.h | 21 ++++++++++++++++++++- 7 files changed, 37 insertions(+), 14 deletions(-) diff --git a/arch/arm/include/asm/hardware/iop3xx-adma.h b/arch/arm/include/asm/hardware/iop3xx-adma.h index 83e6ba338e2..26eefea0231 100644 --- a/arch/arm/include/asm/hardware/iop3xx-adma.h +++ b/arch/arm/include/asm/hardware/iop3xx-adma.h @@ -756,13 +756,14 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc, hw_desc->src[0] = val; } -static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) +static inline enum sum_check_flags +iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) { struct iop3xx_desc_aau *hw_desc = desc->hw_desc; struct iop3xx_aau_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field; iop_paranoia(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en)); - return desc_ctrl.zero_result_err; + return desc_ctrl.zero_result_err << SUM_CHECK_P; } static inline void iop_chan_append(struct iop_adma_chan *chan) diff --git a/arch/arm/mach-iop13xx/include/mach/adma.h b/arch/arm/mach-iop13xx/include/mach/adma.h index 5722e86f217..1cd31df8924 100644 --- a/arch/arm/mach-iop13xx/include/mach/adma.h +++ b/arch/arm/mach-iop13xx/include/mach/adma.h @@ -428,18 +428,20 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc, hw_desc->block_fill_data = val; } -static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) +static inline enum sum_check_flags +iop_desc_get_zero_result(struct iop_adma_desc_slot *desc) { struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; struct iop13xx_adma_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field; struct iop13xx_adma_byte_count byte_count = hw_desc->byte_count_field; + enum sum_check_flags flags; BUG_ON(!(byte_count.tx_complete && desc_ctrl.zero_result)); - if (desc_ctrl.pq_xfer_en) - return byte_count.zero_result_err_q; - else - return byte_count.zero_result_err; + flags = byte_count.zero_result_err_q << SUM_CHECK_Q; + flags |= byte_count.zero_result_err << SUM_CHECK_P; + + return flags; } static inline void iop_chan_append(struct iop_adma_chan *chan) diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 1e96c4df706..78fb7780272 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -246,7 +246,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len) */ struct dma_async_tx_descriptor * async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, u32 *result, + int src_cnt, size_t len, enum sum_check_flags *result, struct async_submit_ctl *submit) { struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL, @@ -304,7 +304,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, async_tx_quiesce(&tx); - *result = page_is_zero(dest, offset, len) ? 0 : 1; + *result = !page_is_zero(dest, offset, len) << SUM_CHECK_P; async_tx_sync_epilog(submit); submit->flags = flags_orig; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 7727954cf72..1f2a266f3cf 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2590,7 +2590,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, * we are done. Otherwise update the mismatch count and repair * parity if !MD_RECOVERY_CHECK */ - if (sh->ops.zero_sum_result == 0) + if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) /* parity is correct (on disc, * not in buffer any more) */ diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index e7baabffee8..75f2c6c4cf9 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -2,6 +2,7 @@ #define _RAID5_H #include +#include /* * @@ -215,8 +216,8 @@ struct stripe_head { * @target - STRIPE_OP_COMPUTE_BLK target */ struct stripe_operations { - int target; - u32 zero_sum_result; + int target; + enum sum_check_flags zero_sum_result; } ops; struct r5dev { struct bio req; diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 00cfb637ddf..3d21a251751 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -148,7 +148,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, struct dma_async_tx_descriptor * async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, - int src_cnt, size_t len, u32 *result, + int src_cnt, size_t len, enum sum_check_flags *result, struct async_submit_ctl *submit); struct dma_async_tx_descriptor * diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 6768727d00d..02447afceba 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -86,6 +86,25 @@ enum dma_ctrl_flags { DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3), }; +/** + * enum sum_check_bits - bit position of pq_check_flags + */ +enum sum_check_bits { + SUM_CHECK_P = 0, + SUM_CHECK_Q = 1, +}; + +/** + * enum pq_check_flags - result of async_{xor,pq}_zero_sum operations + * @SUM_CHECK_P_RESULT - 1 if xor zero sum error, 0 otherwise + * @SUM_CHECK_Q_RESULT - 1 if reed-solomon zero sum error, 0 otherwise + */ +enum sum_check_flags { + SUM_CHECK_P_RESULT = (1 << SUM_CHECK_P), + SUM_CHECK_Q_RESULT = (1 << SUM_CHECK_Q), +}; + + /** * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t. * See linux/cpumask.h @@ -245,7 +264,7 @@ struct dma_device { unsigned int src_cnt, size_t len, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, - size_t len, u32 *result, unsigned long flags); + size_t len, enum sum_check_flags *result, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); From af1f951eb6ef27b01cbfb3f6c21b770af4368a6d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:09:26 -0700 Subject: [PATCH 10/91] async_tx: kill needless module_{init|exit} If module_init and module_exit are nops then neither need to be defined. [ Impact: pure cleanup ] Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- crypto/async_tx/async_memcpy.c | 13 ------------- crypto/async_tx/async_memset.c | 13 ------------- crypto/async_tx/async_tx.c | 17 +++-------------- 3 files changed, 3 insertions(+), 40 deletions(-) diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index 89e05556f3d..98e15bd0dcb 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -90,19 +90,6 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, } EXPORT_SYMBOL_GPL(async_memcpy); -static int __init async_memcpy_init(void) -{ - return 0; -} - -static void __exit async_memcpy_exit(void) -{ - do { } while (0); -} - -module_init(async_memcpy_init); -module_exit(async_memcpy_exit); - MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("asynchronous memcpy api"); MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index c14437238f4..b896a6e5f67 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -80,19 +80,6 @@ async_memset(struct page *dest, int val, unsigned int offset, size_t len, } EXPORT_SYMBOL_GPL(async_memset); -static int __init async_memset_init(void) -{ - return 0; -} - -static void __exit async_memset_exit(void) -{ - do { } while (0); -} - -module_init(async_memset_init); -module_exit(async_memset_exit); - MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("asynchronous memset api"); MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 802a5ce437d..6e37ad3f441 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -42,6 +42,9 @@ static void __exit async_tx_exit(void) async_dmaengine_put(); } +module_init(async_tx_init); +module_exit(async_tx_exit); + /** * __async_tx_find_channel - find a channel to carry out the operation or let * the transaction execute synchronously @@ -61,17 +64,6 @@ __async_tx_find_channel(struct async_submit_ctl *submit, return async_dma_find_channel(tx_type); } EXPORT_SYMBOL_GPL(__async_tx_find_channel); -#else -static int __init async_tx_init(void) -{ - printk(KERN_INFO "async_tx: api initialized (sync-only)\n"); - return 0; -} - -static void __exit async_tx_exit(void) -{ - do { } while (0); -} #endif @@ -298,9 +290,6 @@ void async_tx_quiesce(struct dma_async_tx_descriptor **tx) } EXPORT_SYMBOL_GPL(async_tx_quiesce); -module_init(async_tx_init); -module_exit(async_tx_exit); - MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("Asynchronous Bulk Memory Transactions API"); MODULE_LICENSE("GPL"); From 95475e57113c66aac7583925736ed2e2d58c990d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:19:02 -0700 Subject: [PATCH 11/91] async_tx: remove walk of tx->parent chain in dma_wait_for_async_tx We currently walk the parent chain when waiting for a given tx to complete however this walk may race with the driver cleanup routine. The routines in async_raid6_recov.c may fall back to the synchronous path at any point so we need to be prepared to call async_tx_quiesce() (which calls dma_wait_for_async_tx). To remove the ->parent walk we guarantee that every time a dependency is attached ->issue_pending() is invoked, then we can simply poll the initial descriptor until completion. This also allows for a lighter weight 'issue pending' implementation as there is no longer a requirement to iterate through all the channels' ->issue_pending() routines as long as operations have been submitted in an ordered chain. async_tx_issue_pending() is added for this case. Signed-off-by: Dan Williams --- crypto/async_tx/async_tx.c | 13 ++++++----- drivers/dma/dmaengine.c | 45 +++++++++----------------------------- include/linux/async_tx.h | 23 +++++++++++++++++++ 3 files changed, 40 insertions(+), 41 deletions(-) diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 6e37ad3f441..60615fedcf5 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -77,8 +77,8 @@ static void async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, struct dma_async_tx_descriptor *tx) { - struct dma_chan *chan; - struct dma_device *device; + struct dma_chan *chan = depend_tx->chan; + struct dma_device *device = chan->device; struct dma_async_tx_descriptor *intr_tx = (void *) ~0; /* first check to see if we can still append to depend_tx */ @@ -90,11 +90,11 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, } spin_unlock_bh(&depend_tx->lock); - if (!intr_tx) + /* attached dependency, flush the parent channel */ + if (!intr_tx) { + device->device_issue_pending(chan); return; - - chan = depend_tx->chan; - device = chan->device; + } /* see if we can schedule an interrupt * otherwise poll for completion @@ -128,6 +128,7 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, intr_tx->tx_submit(intr_tx); async_tx_ack(intr_tx); } + device->device_issue_pending(chan); } else { if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR) panic("%s: DMA_ERROR waiting for depend_tx\n", diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 6781e8f3c06..e002e0e0d05 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -934,49 +934,24 @@ EXPORT_SYMBOL(dma_async_tx_descriptor_init); /* dma_wait_for_async_tx - spin wait for a transaction to complete * @tx: in-flight transaction to wait on - * - * This routine assumes that tx was obtained from a call to async_memcpy, - * async_xor, async_memset, etc which ensures that tx is "in-flight" (prepped - * and submitted). Walking the parent chain is only meant to cover for DMA - * drivers that do not implement the DMA_INTERRUPT capability and may race with - * the driver's descriptor cleanup routine. */ enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) { - enum dma_status status; - struct dma_async_tx_descriptor *iter; - struct dma_async_tx_descriptor *parent; + unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); if (!tx) return DMA_SUCCESS; - WARN_ONCE(tx->parent, "%s: speculatively walking dependency chain for" - " %s\n", __func__, dma_chan_name(tx->chan)); - - /* poll through the dependency chain, return when tx is complete */ - do { - iter = tx; - - /* find the root of the unsubmitted dependency chain */ - do { - parent = iter->parent; - if (!parent) - break; - else - iter = parent; - } while (parent); - - /* there is a small window for ->parent == NULL and - * ->cookie == -EBUSY - */ - while (iter->cookie == -EBUSY) - cpu_relax(); - - status = dma_sync_wait(iter->chan, iter->cookie); - } while (status == DMA_IN_PROGRESS || (iter != tx)); - - return status; + while (tx->cookie == -EBUSY) { + if (time_after_eq(jiffies, dma_sync_wait_timeout)) { + pr_err("%s timeout waiting for descriptor submission\n", + __func__); + return DMA_ERROR; + } + cpu_relax(); + } + return dma_sync_wait(tx->chan, tx->cookie); } EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 3d21a251751..12a2efcbd56 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -83,6 +83,24 @@ struct async_submit_ctl { #ifdef CONFIG_DMA_ENGINE #define async_tx_issue_pending_all dma_issue_pending_all + +/** + * async_tx_issue_pending - send pending descriptor to the hardware channel + * @tx: descriptor handle to retrieve hardware context + * + * Note: any dependent operations will have already been issued by + * async_tx_channel_switch, or (in the case of no channel switch) will + * be already pending on this channel. + */ +static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) +{ + if (likely(tx)) { + struct dma_chan *chan = tx->chan; + struct dma_device *dma = chan->device; + + dma->device_issue_pending(chan); + } +} #ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL #include #else @@ -98,6 +116,11 @@ static inline void async_tx_issue_pending_all(void) do { } while (0); } +static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) +{ + do { } while (0); +} + static inline struct dma_chan * async_tx_find_channel(struct async_submit_ctl *submit, enum dma_transaction_type tx_type, struct page **dst, From b2f46fd8ef3dff2ab30f31126833f78b7480283a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:36 -0700 Subject: [PATCH 12/91] async_tx: add support for asynchronous GF multiplication [ Based on an original patch by Yuri Tikhonov ] This adds support for doing asynchronous GF multiplication by adding two additional functions to the async_tx API: async_gen_syndrome() does simultaneous XOR and Galois field multiplication of sources. async_syndrome_val() validates the given source buffers against known P and Q values. When a request is made to run async_pq against more than the hardware maximum number of supported sources we need to reuse the previous generated P and Q values as sources into the next operation. Care must be taken to remove Q from P' and P from Q'. For example to perform a 5 source pq op with hardware that only supports 4 sources at a time the following approach is taken: p, q = PQ(src0, src1, src2, src3, COEF({01}, {02}, {04}, {08})) p', q' = PQ(p, q, q, src4, COEF({00}, {01}, {00}, {10})) p' = p + q + q + src4 = p + src4 q' = {00}*p + {01}*q + {00}*q + {10}*src4 = q + {10}*src4 Note: 4 is the minimum acceptable maxpq otherwise we punt to synchronous-software path. The DMA_PREP_CONTINUE flag indicates to the driver to reuse p and q as sources (in the above manner) and fill the remaining slots up to maxpq with the new sources/coefficients. Note1: Some devices have native support for P+Q continuation and can skip this extra work. Devices with this capability can advertise it with dma_set_maxpq. It is up to each driver how to handle the DMA_PREP_CONTINUE flag. Note2: The api supports disabling the generation of P when generating Q, this is ignored by the synchronous path but is implemented by some dma devices to save unnecessary writes. In this case the continuation algorithm is simplified to only reuse Q as a source. Cc: H. Peter Anvin Cc: David Woodhouse Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 3 + arch/arm/mach-iop13xx/setup.c | 2 +- crypto/async_tx/Kconfig | 4 + crypto/async_tx/Makefile | 1 + crypto/async_tx/async_pq.c | 388 ++++++++++++++++++++++++++ crypto/async_tx/async_xor.c | 2 +- drivers/dma/dmaengine.c | 4 + drivers/dma/iop-adma.c | 2 +- include/linux/async_tx.h | 9 + include/linux/dmaengine.h | 87 +++++- 10 files changed, 493 insertions(+), 9 deletions(-) create mode 100644 crypto/async_tx/async_pq.c diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 6b15e488c0e..0e48e054d69 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -64,6 +64,9 @@ xor - xor a series of source buffers and write the result to a xor_val - xor a series of source buffers and set a flag if the result is zero. The implementation attempts to prevent writes to memory +pq - generate the p+q (raid6 syndrome) from a series of source buffers +pq_val - validate that a p and or q buffer are in sync with a given series of + sources 3.3 Descriptor management: The return value is non-NULL and points to a 'descriptor' when the operation diff --git a/arch/arm/mach-iop13xx/setup.c b/arch/arm/mach-iop13xx/setup.c index 9800228b71d..2e7ca0d75f8 100644 --- a/arch/arm/mach-iop13xx/setup.c +++ b/arch/arm/mach-iop13xx/setup.c @@ -506,7 +506,7 @@ void __init iop13xx_platform_init(void) dma_cap_set(DMA_MEMSET, plat_data->cap_mask); dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); - dma_cap_set(DMA_PQ_XOR, plat_data->cap_mask); + dma_cap_set(DMA_PQ, plat_data->cap_mask); dma_cap_set(DMA_PQ_UPDATE, plat_data->cap_mask); dma_cap_set(DMA_PQ_VAL, plat_data->cap_mask); break; diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig index d8fb3914598..cb6d7314f19 100644 --- a/crypto/async_tx/Kconfig +++ b/crypto/async_tx/Kconfig @@ -14,3 +14,7 @@ config ASYNC_MEMSET tristate select ASYNC_CORE +config ASYNC_PQ + tristate + select ASYNC_CORE + diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 27baa7d52fb..1b992658825 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_ASYNC_CORE) += async_tx.o obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o obj-$(CONFIG_ASYNC_XOR) += async_xor.o +obj-$(CONFIG_ASYNC_PQ) += async_pq.o diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c new file mode 100644 index 00000000000..108b21efb49 --- /dev/null +++ b/crypto/async_tx/async_pq.c @@ -0,0 +1,388 @@ +/* + * Copyright(c) 2007 Yuri Tikhonov + * Copyright(c) 2009 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#include +#include +#include +#include +#include + +/** + * scribble - space to hold throwaway P buffer for synchronous gen_syndrome + */ +static struct page *scribble; + +static bool is_raid6_zero_block(struct page *p) +{ + return p == (void *) raid6_empty_zero_page; +} + +/* the struct page *blocks[] parameter passed to async_gen_syndrome() + * and async_syndrome_val() contains the 'P' destination address at + * blocks[disks-2] and the 'Q' destination address at blocks[disks-1] + * + * note: these are macros as they are used as lvalues + */ +#define P(b, d) (b[d-2]) +#define Q(b, d) (b[d-1]) + +/** + * do_async_gen_syndrome - asynchronously calculate P and/or Q + */ +static __async_inline struct dma_async_tx_descriptor * +do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks, + const unsigned char *scfs, unsigned int offset, int disks, + size_t len, dma_addr_t *dma_src, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct dma_device *dma = chan->device; + enum dma_ctrl_flags dma_flags = 0; + enum async_tx_flags flags_orig = submit->flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + dma_async_tx_callback cb_param_orig = submit->cb_param; + int src_cnt = disks - 2; + unsigned char coefs[src_cnt]; + unsigned short pq_src_cnt; + dma_addr_t dma_dest[2]; + int src_off = 0; + int idx; + int i; + + /* DMAs use destinations as sources, so use BIDIRECTIONAL mapping */ + if (P(blocks, disks)) + dma_dest[0] = dma_map_page(dma->dev, P(blocks, disks), offset, + len, DMA_BIDIRECTIONAL); + else + dma_flags |= DMA_PREP_PQ_DISABLE_P; + if (Q(blocks, disks)) + dma_dest[1] = dma_map_page(dma->dev, Q(blocks, disks), offset, + len, DMA_BIDIRECTIONAL); + else + dma_flags |= DMA_PREP_PQ_DISABLE_Q; + + /* convert source addresses being careful to collapse 'empty' + * sources and update the coefficients accordingly + */ + for (i = 0, idx = 0; i < src_cnt; i++) { + if (is_raid6_zero_block(blocks[i])) + continue; + dma_src[idx] = dma_map_page(dma->dev, blocks[i], offset, len, + DMA_TO_DEVICE); + coefs[idx] = scfs[i]; + idx++; + } + src_cnt = idx; + + while (src_cnt > 0) { + submit->flags = flags_orig; + pq_src_cnt = min(src_cnt, dma_maxpq(dma, dma_flags)); + /* if we are submitting additional pqs, leave the chain open, + * clear the callback parameters, and leave the destination + * buffers mapped + */ + if (src_cnt > pq_src_cnt) { + submit->flags &= ~ASYNC_TX_ACK; + dma_flags |= DMA_COMPL_SKIP_DEST_UNMAP; + submit->cb_fn = NULL; + submit->cb_param = NULL; + } else { + dma_flags &= ~DMA_COMPL_SKIP_DEST_UNMAP; + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; + if (cb_fn_orig) + dma_flags |= DMA_PREP_INTERRUPT; + } + + /* Since we have clobbered the src_list we are committed + * to doing this asynchronously. Drivers force forward + * progress in case they can not provide a descriptor + */ + for (;;) { + tx = dma->device_prep_dma_pq(chan, dma_dest, + &dma_src[src_off], + pq_src_cnt, + &coefs[src_off], len, + dma_flags); + if (likely(tx)) + break; + async_tx_quiesce(&submit->depend_tx); + dma_async_issue_pending(chan); + } + + async_tx_submit(chan, tx, submit); + submit->depend_tx = tx; + + /* drop completed sources */ + src_cnt -= pq_src_cnt; + src_off += pq_src_cnt; + + dma_flags |= DMA_PREP_CONTINUE; + } + + return tx; +} + +/** + * do_sync_gen_syndrome - synchronously calculate a raid6 syndrome + */ +static void +do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks, + size_t len, struct async_submit_ctl *submit) +{ + void **srcs; + int i; + + if (submit->scribble) + srcs = submit->scribble; + else + srcs = (void **) blocks; + + for (i = 0; i < disks; i++) { + if (is_raid6_zero_block(blocks[i])) { + BUG_ON(i > disks - 3); /* P or Q can't be zero */ + srcs[i] = blocks[i]; + } else + srcs[i] = page_address(blocks[i]) + offset; + } + raid6_call.gen_syndrome(disks, len, srcs); + async_tx_sync_epilog(submit); +} + +/** + * async_gen_syndrome - asynchronously calculate a raid6 syndrome + * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1 + * @offset: common offset into each block (src and dest) to start transaction + * @disks: number of blocks (including missing P or Q, see below) + * @len: length of operation in bytes + * @submit: submission/completion modifiers + * + * General note: This routine assumes a field of GF(2^8) with a + * primitive polynomial of 0x11d and a generator of {02}. + * + * 'disks' note: callers can optionally omit either P or Q (but not + * both) from the calculation by setting blocks[disks-2] or + * blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <= + * PAGE_SIZE as a temporary buffer of this size is used in the + * synchronous path. 'disks' always accounts for both destination + * buffers. + * + * 'blocks' note: if submit->scribble is NULL then the contents of + * 'blocks' may be overridden + */ +struct dma_async_tx_descriptor * +async_gen_syndrome(struct page **blocks, unsigned int offset, int disks, + size_t len, struct async_submit_ctl *submit) +{ + int src_cnt = disks - 2; + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &P(blocks, disks), 2, + blocks, src_cnt, len); + struct dma_device *device = chan ? chan->device : NULL; + dma_addr_t *dma_src = NULL; + + BUG_ON(disks > 255 || !(P(blocks, disks) || Q(blocks, disks))); + + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) blocks; + + if (dma_src && device && + (src_cnt <= dma_maxpq(device, 0) || + dma_maxpq(device, DMA_PREP_CONTINUE) > 0)) { + /* run the p+q asynchronously */ + pr_debug("%s: (async) disks: %d len: %zu\n", + __func__, disks, len); + return do_async_gen_syndrome(chan, blocks, raid6_gfexp, offset, + disks, len, dma_src, submit); + } + + /* run the pq synchronously */ + pr_debug("%s: (sync) disks: %d len: %zu\n", __func__, disks, len); + + /* wait for any prerequisite operations */ + async_tx_quiesce(&submit->depend_tx); + + if (!P(blocks, disks)) { + P(blocks, disks) = scribble; + BUG_ON(len + offset > PAGE_SIZE); + } + if (!Q(blocks, disks)) { + Q(blocks, disks) = scribble; + BUG_ON(len + offset > PAGE_SIZE); + } + do_sync_gen_syndrome(blocks, offset, disks, len, submit); + + return NULL; +} +EXPORT_SYMBOL_GPL(async_gen_syndrome); + +/** + * async_syndrome_val - asynchronously validate a raid6 syndrome + * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1 + * @offset: common offset into each block (src and dest) to start transaction + * @disks: number of blocks (including missing P or Q, see below) + * @len: length of operation in bytes + * @pqres: on val failure SUM_CHECK_P_RESULT and/or SUM_CHECK_Q_RESULT are set + * @spare: temporary result buffer for the synchronous case + * @submit: submission / completion modifiers + * + * The same notes from async_gen_syndrome apply to the 'blocks', + * and 'disks' parameters of this routine. The synchronous path + * requires a temporary result buffer and submit->scribble to be + * specified. + */ +struct dma_async_tx_descriptor * +async_syndrome_val(struct page **blocks, unsigned int offset, int disks, + size_t len, enum sum_check_flags *pqres, struct page *spare, + struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ_VAL, + NULL, 0, blocks, disks, + len); + struct dma_device *device = chan ? chan->device : NULL; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; + dma_addr_t *dma_src = NULL; + + BUG_ON(disks < 4); + + if (submit->scribble) + dma_src = submit->scribble; + else if (sizeof(dma_addr_t) <= sizeof(struct page *)) + dma_src = (dma_addr_t *) blocks; + + if (dma_src && device && disks <= dma_maxpq(device, 0)) { + struct device *dev = device->dev; + dma_addr_t *pq = &dma_src[disks-2]; + int i; + + pr_debug("%s: (async) disks: %d len: %zu\n", + __func__, disks, len); + if (!P(blocks, disks)) + dma_flags |= DMA_PREP_PQ_DISABLE_P; + if (!Q(blocks, disks)) + dma_flags |= DMA_PREP_PQ_DISABLE_Q; + for (i = 0; i < disks; i++) + if (likely(blocks[i])) { + BUG_ON(is_raid6_zero_block(blocks[i])); + dma_src[i] = dma_map_page(dev, blocks[i], + offset, len, + DMA_TO_DEVICE); + } + + for (;;) { + tx = device->device_prep_dma_pq_val(chan, pq, dma_src, + disks - 2, + raid6_gfexp, + len, pqres, + dma_flags); + if (likely(tx)) + break; + async_tx_quiesce(&submit->depend_tx); + dma_async_issue_pending(chan); + } + async_tx_submit(chan, tx, submit); + + return tx; + } else { + struct page *p_src = P(blocks, disks); + struct page *q_src = Q(blocks, disks); + enum async_tx_flags flags_orig = submit->flags; + dma_async_tx_callback cb_fn_orig = submit->cb_fn; + void *scribble = submit->scribble; + void *cb_param_orig = submit->cb_param; + void *p, *q, *s; + + pr_debug("%s: (sync) disks: %d len: %zu\n", + __func__, disks, len); + + /* caller must provide a temporary result buffer and + * allow the input parameters to be preserved + */ + BUG_ON(!spare || !scribble); + + /* wait for any prerequisite operations */ + async_tx_quiesce(&submit->depend_tx); + + /* recompute p and/or q into the temporary buffer and then + * check to see the result matches the current value + */ + tx = NULL; + *pqres = 0; + if (p_src) { + init_async_submit(submit, ASYNC_TX_XOR_ZERO_DST, NULL, + NULL, NULL, scribble); + tx = async_xor(spare, blocks, offset, disks-2, len, submit); + async_tx_quiesce(&tx); + p = page_address(p_src) + offset; + s = page_address(spare) + offset; + *pqres |= !!memcmp(p, s, len) << SUM_CHECK_P; + } + + if (q_src) { + P(blocks, disks) = NULL; + Q(blocks, disks) = spare; + init_async_submit(submit, 0, NULL, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, offset, disks, len, submit); + async_tx_quiesce(&tx); + q = page_address(q_src) + offset; + s = page_address(spare) + offset; + *pqres |= !!memcmp(q, s, len) << SUM_CHECK_Q; + } + + /* restore P, Q and submit */ + P(blocks, disks) = p_src; + Q(blocks, disks) = q_src; + + submit->cb_fn = cb_fn_orig; + submit->cb_param = cb_param_orig; + submit->flags = flags_orig; + async_tx_sync_epilog(submit); + + return NULL; + } +} +EXPORT_SYMBOL_GPL(async_syndrome_val); + +static int __init async_pq_init(void) +{ + scribble = alloc_page(GFP_KERNEL); + + if (scribble) + return 0; + + pr_err("%s: failed to allocate required spare page\n", __func__); + + return -ENOMEM; +} + +static void __exit async_pq_exit(void) +{ + put_page(scribble); +} + +module_init(async_pq_init); +module_exit(async_pq_exit); + +MODULE_DESCRIPTION("asynchronous raid6 syndrome generation/validation"); +MODULE_LICENSE("GPL"); diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 78fb7780272..56b5f98da46 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -62,7 +62,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, while (src_cnt) { submit->flags = flags_orig; dma_flags = 0; - xor_src_cnt = min(src_cnt, dma->max_xor); + xor_src_cnt = min(src_cnt, (int)dma->max_xor); /* if we are submitting additional xors, leave the chain open, * clear the callback parameters, and leave the destination * buffer mapped diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index e002e0e0d05..cd5673d3043 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -646,6 +646,10 @@ int dma_async_device_register(struct dma_device *device) !device->device_prep_dma_xor); BUG_ON(dma_has_cap(DMA_XOR_VAL, device->cap_mask) && !device->device_prep_dma_xor_val); + BUG_ON(dma_has_cap(DMA_PQ, device->cap_mask) && + !device->device_prep_dma_pq); + BUG_ON(dma_has_cap(DMA_PQ_VAL, device->cap_mask) && + !device->device_prep_dma_pq_val); BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) && !device->device_prep_dma_memset); BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) && diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 6ff79a67269..4496bc60666 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -1257,7 +1257,7 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " "( %s%s%s%s%s%s%s%s%s%s)\n", - dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", + dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "", dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "", dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 12a2efcbd56..e6ce5f004f9 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -185,5 +185,14 @@ async_memset(struct page *dest, int val, unsigned int offset, struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); +struct dma_async_tx_descriptor * +async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, enum sum_check_flags *pqres, struct page *spare, + struct async_submit_ctl *submit); + void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 02447afceba..ce010cd991d 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -52,7 +52,7 @@ enum dma_status { enum dma_transaction_type { DMA_MEMCPY, DMA_XOR, - DMA_PQ_XOR, + DMA_PQ, DMA_DUAL_XOR, DMA_PQ_UPDATE, DMA_XOR_VAL, @@ -70,20 +70,28 @@ enum dma_transaction_type { /** * enum dma_ctrl_flags - DMA flags to augment operation preparation, - * control completion, and communicate status. + * control completion, and communicate status. * @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of - * this transaction + * this transaction * @DMA_CTRL_ACK - the descriptor cannot be reused until the client - * acknowledges receipt, i.e. has has a chance to establish any - * dependency chains + * acknowledges receipt, i.e. has has a chance to establish any dependency + * chains * @DMA_COMPL_SKIP_SRC_UNMAP - set to disable dma-unmapping the source buffer(s) * @DMA_COMPL_SKIP_DEST_UNMAP - set to disable dma-unmapping the destination(s) + * @DMA_PREP_PQ_DISABLE_P - prevent generation of P while generating Q + * @DMA_PREP_PQ_DISABLE_Q - prevent generation of Q while generating P + * @DMA_PREP_CONTINUE - indicate to a driver that it is reusing buffers as + * sources that were the result of a previous operation, in the case of a PQ + * operation it continues the calculation with new sources */ enum dma_ctrl_flags { DMA_PREP_INTERRUPT = (1 << 0), DMA_CTRL_ACK = (1 << 1), DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2), DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3), + DMA_PREP_PQ_DISABLE_P = (1 << 4), + DMA_PREP_PQ_DISABLE_Q = (1 << 5), + DMA_PREP_CONTINUE = (1 << 6), }; /** @@ -226,6 +234,7 @@ struct dma_async_tx_descriptor { * @global_node: list_head for global dma_device_list * @cap_mask: one or more dma_capability flags * @max_xor: maximum number of xor sources, 0 if no capability + * @max_pq: maximum number of PQ sources and PQ-continue capability * @dev_id: unique device ID * @dev: struct device reference for dma mapping api * @device_alloc_chan_resources: allocate resources and return the @@ -234,6 +243,8 @@ struct dma_async_tx_descriptor { * @device_prep_dma_memcpy: prepares a memcpy operation * @device_prep_dma_xor: prepares a xor operation * @device_prep_dma_xor_val: prepares a xor validation operation + * @device_prep_dma_pq: prepares a pq operation + * @device_prep_dma_pq_val: prepares a pqzero_sum operation * @device_prep_dma_memset: prepares a memset operation * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation @@ -248,7 +259,9 @@ struct dma_device { struct list_head channels; struct list_head global_node; dma_cap_mask_t cap_mask; - int max_xor; + unsigned short max_xor; + unsigned short max_pq; + #define DMA_HAS_PQ_CONTINUE (1 << 15) int dev_id; struct device *dev; @@ -265,6 +278,14 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, size_t len, enum sum_check_flags *result, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_pq)( + struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_pq_val)( + struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); @@ -283,6 +304,60 @@ struct dma_device { void (*device_issue_pending)(struct dma_chan *chan); }; +static inline void +dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue) +{ + dma->max_pq = maxpq; + if (has_pq_continue) + dma->max_pq |= DMA_HAS_PQ_CONTINUE; +} + +static inline bool dmaf_continue(enum dma_ctrl_flags flags) +{ + return (flags & DMA_PREP_CONTINUE) == DMA_PREP_CONTINUE; +} + +static inline bool dmaf_p_disabled_continue(enum dma_ctrl_flags flags) +{ + enum dma_ctrl_flags mask = DMA_PREP_CONTINUE | DMA_PREP_PQ_DISABLE_P; + + return (flags & mask) == mask; +} + +static inline bool dma_dev_has_pq_continue(struct dma_device *dma) +{ + return (dma->max_pq & DMA_HAS_PQ_CONTINUE) == DMA_HAS_PQ_CONTINUE; +} + +static unsigned short dma_dev_to_maxpq(struct dma_device *dma) +{ + return dma->max_pq & ~DMA_HAS_PQ_CONTINUE; +} + +/* dma_maxpq - reduce maxpq in the face of continued operations + * @dma - dma device with PQ capability + * @flags - to check if DMA_PREP_CONTINUE and DMA_PREP_PQ_DISABLE_P are set + * + * When an engine does not support native continuation we need 3 extra + * source slots to reuse P and Q with the following coefficients: + * 1/ {00} * P : remove P from Q', but use it as a source for P' + * 2/ {01} * Q : use Q to continue Q' calculation + * 3/ {00} * Q : subtract Q from P' to cancel (2) + * + * In the case where P is disabled we only need 1 extra source: + * 1/ {01} * Q : use Q to continue Q' calculation + */ +static inline int dma_maxpq(struct dma_device *dma, enum dma_ctrl_flags flags) +{ + if (dma_dev_has_pq_continue(dma) || !dmaf_continue(flags)) + return dma_dev_to_maxpq(dma); + else if (dmaf_p_disabled_continue(flags)) + return dma_dev_to_maxpq(dma) - 1; + else if (dmaf_continue(flags)) + return dma_dev_to_maxpq(dma) - 3; + BUG(); +} + /* --- public DMA engine API --- */ #ifdef CONFIG_DMA_ENGINE From 0a82a6239beecc95db6e05fe43ee62d16b381d38 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:37 -0700 Subject: [PATCH 13/91] async_tx: add support for asynchronous RAID6 recovery operations async_raid6_2data_recov() recovers two data disk failures async_raid6_datap_recov() recovers a data disk and the P disk These routines are a port of the synchronous versions found in drivers/md/raid6recov.c. The primary difference is breaking out the xor operations into separate calls to async_xor. Two helper routines are introduced to perform scalar multiplication where needed. async_sum_product() multiplies two sources by scalar coefficients and then sums (xor) the result. async_mult() simply multiplies a single source by a scalar. This implemention also includes, in contrast to the original synchronous-only code, special case handling for the 4-disk and 5-disk array cases. In these situations the default N-disk algorithm will present 0-source or 1-source operations to dma devices. To cover for dma devices where the minimum source count is 2 we implement 4-disk and 5-disk handling in the recovery code. [ Impact: asynchronous raid6 recovery routines for 2data and datap cases ] Cc: Yuri Tikhonov Cc: Ilya Yanok Cc: H. Peter Anvin Cc: David Woodhouse Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- Documentation/crypto/async-tx-api.txt | 4 + crypto/async_tx/Kconfig | 5 + crypto/async_tx/Makefile | 1 + crypto/async_tx/async_raid6_recov.c | 448 ++++++++++++++++++++++++++ include/linux/async_tx.h | 8 + 5 files changed, 466 insertions(+) create mode 100644 crypto/async_tx/async_raid6_recov.c diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt index 0e48e054d69..ba046b8fa92 100644 --- a/Documentation/crypto/async-tx-api.txt +++ b/Documentation/crypto/async-tx-api.txt @@ -67,6 +67,10 @@ xor_val - xor a series of source buffers and set a flag if the pq - generate the p+q (raid6 syndrome) from a series of source buffers pq_val - validate that a p and or q buffer are in sync with a given series of sources +datap - (raid6_datap_recov) recover a raid6 data block and the p block + from the given sources +2data - (raid6_2data_recov) recover 2 raid6 data blocks from the given + sources 3.3 Descriptor management: The return value is non-NULL and points to a 'descriptor' when the operation diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig index cb6d7314f19..e5aeb2b79e6 100644 --- a/crypto/async_tx/Kconfig +++ b/crypto/async_tx/Kconfig @@ -18,3 +18,8 @@ config ASYNC_PQ tristate select ASYNC_CORE +config ASYNC_RAID6_RECOV + tristate + select ASYNC_CORE + select ASYNC_PQ + diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 1b992658825..9a1a76811b8 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o obj-$(CONFIG_ASYNC_XOR) += async_xor.o obj-$(CONFIG_ASYNC_PQ) += async_pq.o +obj-$(CONFIG_ASYNC_RAID6_RECOV) += async_raid6_recov.o diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c new file mode 100644 index 00000000000..0c14d48c989 --- /dev/null +++ b/crypto/async_tx/async_raid6_recov.c @@ -0,0 +1,448 @@ +/* + * Asynchronous RAID-6 recovery calculations ASYNC_TX API. + * Copyright(c) 2009 Intel Corporation + * + * based on raid6recov.c: + * Copyright 2002 H. Peter Anvin + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include +#include +#include +#include +#include + +static struct dma_async_tx_descriptor * +async_sum_product(struct page *dest, struct page **srcs, unsigned char *coef, + size_t len, struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &dest, 1, srcs, 2, len); + struct dma_device *dma = chan ? chan->device : NULL; + const u8 *amul, *bmul; + u8 ax, bx; + u8 *a, *b, *c; + + if (dma) { + dma_addr_t dma_dest[2]; + dma_addr_t dma_src[2]; + struct device *dev = dma->dev; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + + dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); + dma_src[0] = dma_map_page(dev, srcs[0], 0, len, DMA_TO_DEVICE); + dma_src[1] = dma_map_page(dev, srcs[1], 0, len, DMA_TO_DEVICE); + tx = dma->device_prep_dma_pq(chan, dma_dest, dma_src, 2, coef, + len, dma_flags); + if (tx) { + async_tx_submit(chan, tx, submit); + return tx; + } + } + + /* run the operation synchronously */ + async_tx_quiesce(&submit->depend_tx); + amul = raid6_gfmul[coef[0]]; + bmul = raid6_gfmul[coef[1]]; + a = page_address(srcs[0]); + b = page_address(srcs[1]); + c = page_address(dest); + + while (len--) { + ax = amul[*a++]; + bx = bmul[*b++]; + *c++ = ax ^ bx; + } + + return NULL; +} + +static struct dma_async_tx_descriptor * +async_mult(struct page *dest, struct page *src, u8 coef, size_t len, + struct async_submit_ctl *submit) +{ + struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ, + &dest, 1, &src, 1, len); + struct dma_device *dma = chan ? chan->device : NULL; + const u8 *qmul; /* Q multiplier table */ + u8 *d, *s; + + if (dma) { + dma_addr_t dma_dest[2]; + dma_addr_t dma_src[1]; + struct device *dev = dma->dev; + struct dma_async_tx_descriptor *tx; + enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + + dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); + dma_src[0] = dma_map_page(dev, src, 0, len, DMA_TO_DEVICE); + tx = dma->device_prep_dma_pq(chan, dma_dest, dma_src, 1, &coef, + len, dma_flags); + if (tx) { + async_tx_submit(chan, tx, submit); + return tx; + } + } + + /* no channel available, or failed to allocate a descriptor, so + * perform the operation synchronously + */ + async_tx_quiesce(&submit->depend_tx); + qmul = raid6_gfmul[coef]; + d = page_address(dest); + s = page_address(src); + + while (len--) + *d++ = qmul[*s++]; + + return NULL; +} + +static struct dma_async_tx_descriptor * +__2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *a, *b; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + + p = blocks[4-2]; + q = blocks[4-1]; + + a = blocks[faila]; + b = blocks[failb]; + + /* in the 4 disk case P + Pxy == P and Q + Qxy == Q */ + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = p; + srcs[1] = q; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(b, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = p; + srcs[1] = b; + init_async_submit(submit, flags | ASYNC_TX_XOR_ZERO_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(a, srcs, 0, 2, bytes, submit); + + return tx; + +} + +static struct dma_async_tx_descriptor * +__2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks, + struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *g, *dp, *dq; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + int uninitialized_var(good); + int i; + + for (i = 0; i < 3; i++) { + if (i == faila || i == failb) + continue; + else { + good = i; + break; + } + } + BUG_ON(i >= 3); + + p = blocks[5-2]; + q = blocks[5-1]; + g = blocks[good]; + + /* Compute syndrome with zero for the missing data pages + * Use the dead data pages as temporary storage for delta p and + * delta q + */ + dp = blocks[faila]; + dq = blocks[failb]; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_memcpy(dp, g, 0, 0, bytes, submit); + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); + + /* compute P + Pxy */ + srcs[0] = dp; + srcs[1] = p; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + /* compute Q + Qxy */ + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = dp; + srcs[1] = dq; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(dq, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = dp; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + return tx; +} + +static struct dma_async_tx_descriptor * +__2data_recov_n(int disks, size_t bytes, int faila, int failb, + struct page **blocks, struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *dp, *dq; + struct page *srcs[2]; + unsigned char coef[2]; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + + p = blocks[disks-2]; + q = blocks[disks-1]; + + /* Compute syndrome with zero for the missing data pages + * Use the dead data pages as temporary storage for + * delta p and delta q + */ + dp = blocks[faila]; + blocks[faila] = (void *)raid6_empty_zero_page; + blocks[disks-2] = dp; + dq = blocks[failb]; + blocks[failb] = (void *)raid6_empty_zero_page; + blocks[disks-1] = dq; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); + + /* Restore pointer table */ + blocks[faila] = dp; + blocks[failb] = dq; + blocks[disks-2] = p; + blocks[disks-1] = q; + + /* compute P + Pxy */ + srcs[0] = dp; + srcs[1] = p; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + /* compute Q + Qxy */ + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ + srcs[0] = dp; + srcs[1] = dq; + coef[0] = raid6_gfexi[failb-faila]; + coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_sum_product(dq, srcs, coef, bytes, submit); + + /* Dy = P+Pxy+Dx */ + srcs[0] = dp; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(dp, srcs, 0, 2, bytes, submit); + + return tx; +} + +/** + * async_raid6_2data_recov - asynchronously calculate two missing data blocks + * @disks: number of disks in the RAID-6 array + * @bytes: block size + * @faila: first failed drive index + * @failb: second failed drive index + * @blocks: array of source pointers where the last two entries are p and q + * @submit: submission/completion modifiers + */ +struct dma_async_tx_descriptor * +async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb, + struct page **blocks, struct async_submit_ctl *submit) +{ + BUG_ON(faila == failb); + if (failb < faila) + swap(faila, failb); + + pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes); + + /* we need to preserve the contents of 'blocks' for the async + * case, so punt to synchronous if a scribble buffer is not available + */ + if (!submit->scribble) { + void **ptrs = (void **) blocks; + int i; + + async_tx_quiesce(&submit->depend_tx); + for (i = 0; i < disks; i++) + ptrs[i] = page_address(blocks[i]); + + raid6_2data_recov(disks, bytes, faila, failb, ptrs); + + async_tx_sync_epilog(submit); + + return NULL; + } + + switch (disks) { + case 4: + /* dma devices do not uniformly understand a zero source pq + * operation (in contrast to the synchronous case), so + * explicitly handle the 4 disk special case + */ + return __2data_recov_4(bytes, faila, failb, blocks, submit); + case 5: + /* dma devices do not uniformly understand a single + * source pq operation (in contrast to the synchronous + * case), so explicitly handle the 5 disk special case + */ + return __2data_recov_5(bytes, faila, failb, blocks, submit); + default: + return __2data_recov_n(disks, bytes, faila, failb, blocks, submit); + } +} +EXPORT_SYMBOL_GPL(async_raid6_2data_recov); + +/** + * async_raid6_datap_recov - asynchronously calculate a data and the 'p' block + * @disks: number of disks in the RAID-6 array + * @bytes: block size + * @faila: failed drive index + * @blocks: array of source pointers where the last two entries are p and q + * @submit: submission/completion modifiers + */ +struct dma_async_tx_descriptor * +async_raid6_datap_recov(int disks, size_t bytes, int faila, + struct page **blocks, struct async_submit_ctl *submit) +{ + struct dma_async_tx_descriptor *tx = NULL; + struct page *p, *q, *dq; + u8 coef; + enum async_tx_flags flags = submit->flags; + dma_async_tx_callback cb_fn = submit->cb_fn; + void *cb_param = submit->cb_param; + void *scribble = submit->scribble; + struct page *srcs[2]; + + pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes); + + /* we need to preserve the contents of 'blocks' for the async + * case, so punt to synchronous if a scribble buffer is not available + */ + if (!scribble) { + void **ptrs = (void **) blocks; + int i; + + async_tx_quiesce(&submit->depend_tx); + for (i = 0; i < disks; i++) + ptrs[i] = page_address(blocks[i]); + + raid6_datap_recov(disks, bytes, faila, ptrs); + + async_tx_sync_epilog(submit); + + return NULL; + } + + p = blocks[disks-2]; + q = blocks[disks-1]; + + /* Compute syndrome with zero for the missing data page + * Use the dead data page as temporary storage for delta q + */ + dq = blocks[faila]; + blocks[faila] = (void *)raid6_empty_zero_page; + blocks[disks-1] = dq; + + /* in the 4 disk case we only need to perform a single source + * multiplication + */ + if (disks == 4) { + int good = faila == 0 ? 1 : 0; + struct page *g = blocks[good]; + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_memcpy(p, g, 0, 0, bytes, submit); + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); + } else { + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); + } + + /* Restore pointer table */ + blocks[faila] = dq; + blocks[disks-1] = q; + + /* calculate g^{-faila} */ + coef = raid6_gfinv[raid6_gfexp[faila]]; + + srcs[0] = dq; + srcs[1] = q; + init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, + scribble); + tx = async_xor(dq, srcs, 0, 2, bytes, submit); + + init_async_submit(submit, 0, tx, NULL, NULL, scribble); + tx = async_mult(dq, dq, coef, bytes, submit); + + srcs[0] = p; + srcs[1] = dq; + init_async_submit(submit, flags | ASYNC_TX_XOR_DROP_DST, tx, cb_fn, + cb_param, scribble); + tx = async_xor(p, srcs, 0, 2, bytes, submit); + + return tx; +} +EXPORT_SYMBOL_GPL(async_raid6_datap_recov); + +MODULE_AUTHOR("Dan Williams "); +MODULE_DESCRIPTION("asynchronous RAID-6 recovery api"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index e6ce5f004f9..866e61c4e2e 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -194,5 +194,13 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt, size_t len, enum sum_check_flags *pqres, struct page *spare, struct async_submit_ctl *submit); +struct dma_async_tx_descriptor * +async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb, + struct page **ptrs, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_raid6_datap_recov(int src_num, size_t bytes, int faila, + struct page **ptrs, struct async_submit_ctl *submit); + void async_tx_quiesce(struct dma_async_tx_descriptor **tx); #endif /* _ASYNC_TX_H_ */ From 58691d64c44ae41ddf098ecb31e9a994026e3cff Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:09:27 -0700 Subject: [PATCH 14/91] dmatest: add pq support Test raid6 p+q operations with a simple "always multiply by 1" q calculation to fit into dmatest's current destination verification scheme. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/dmatest.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index a27c0fb1bc1..a5ee5413905 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -43,6 +43,11 @@ module_param(xor_sources, uint, S_IRUGO); MODULE_PARM_DESC(xor_sources, "Number of xor source buffers (default: 3)"); +static unsigned int pq_sources = 3; +module_param(pq_sources, uint, S_IRUGO); +MODULE_PARM_DESC(pq_sources, + "Number of p+q source buffers (default: 3)"); + /* * Initialization patterns. All bytes in the source buffer has bit 7 * set, all bytes in the destination buffer has bit 7 cleared. @@ -227,6 +232,7 @@ static int dmatest_func(void *data) dma_cookie_t cookie; enum dma_status status; enum dma_ctrl_flags flags; + u8 pq_coefs[pq_sources]; int ret; int src_cnt; int dst_cnt; @@ -243,6 +249,11 @@ static int dmatest_func(void *data) else if (thread->type == DMA_XOR) { src_cnt = xor_sources | 1; /* force odd to ensure dst = src */ dst_cnt = 1; + } else if (thread->type == DMA_PQ) { + src_cnt = pq_sources | 1; /* force odd to ensure dst = src */ + dst_cnt = 2; + for (i = 0; i < pq_sources; i++) + pq_coefs[i] = 1; } else goto err_srcs; @@ -310,6 +321,15 @@ static int dmatest_func(void *data) dma_dsts[0] + dst_off, dma_srcs, xor_sources, len, flags); + else if (thread->type == DMA_PQ) { + dma_addr_t dma_pq[dst_cnt]; + + for (i = 0; i < dst_cnt; i++) + dma_pq[i] = dma_dsts[i] + dst_off; + tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs, + pq_sources, pq_coefs, + len, flags); + } if (!tx) { for (i = 0; i < src_cnt; i++) @@ -446,6 +466,8 @@ static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_ty op = "copy"; else if (type == DMA_XOR) op = "xor"; + else if (type == DMA_PQ) + op = "pq"; else return -EINVAL; @@ -501,6 +523,10 @@ static int dmatest_add_channel(struct dma_chan *chan) cnt = dmatest_add_threads(dtc, DMA_XOR); thread_count += cnt > 0 ?: 0; } + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(dtc, DMA_PQ); + thread_count += cnt > 0 ?: 0; + } pr_info("dmatest: Started %u threads using %s\n", thread_count, dma_chan_name(chan)); From cb3c82992f62f838e6476a0bff12909158007fc6 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 12:20:37 -0700 Subject: [PATCH 15/91] async_tx: raid6 recovery self test Port drivers/md/raid6test/test.c to use the async raid6 recovery routines. This is meant as a unit test for raid6 acceleration drivers. In addition to the 16-drive test case this implements tests for the 4-disk and 5-disk special cases (dma devices can not generically handle less than 2 sources), and adds a test for the D+Q case. Reviewed-by: Andre Noll Acked-by: Maciej Sosnowski Signed-off-by: Dan Williams --- crypto/async_tx/Makefile | 1 + crypto/async_tx/raid6test.c | 241 ++++++++++++++++++++++++++++++++++++ drivers/md/Kconfig | 13 ++ 3 files changed, 255 insertions(+) create mode 100644 crypto/async_tx/raid6test.c diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile index 9a1a76811b8..d1e0e6f72bc 100644 --- a/crypto/async_tx/Makefile +++ b/crypto/async_tx/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o obj-$(CONFIG_ASYNC_XOR) += async_xor.o obj-$(CONFIG_ASYNC_PQ) += async_pq.o obj-$(CONFIG_ASYNC_RAID6_RECOV) += async_raid6_recov.o +obj-$(CONFIG_ASYNC_RAID6_TEST) += raid6test.o diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c new file mode 100644 index 00000000000..98c83ca96c8 --- /dev/null +++ b/crypto/async_tx/raid6test.c @@ -0,0 +1,241 @@ +/* + * asynchronous raid6 recovery self test + * Copyright (c) 2009, Intel Corporation. + * + * based on drivers/md/raid6test/test.c: + * Copyright 2002-2007 H. Peter Anvin + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include +#include + +#undef pr +#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args) + +#define NDISKS 16 /* Including P and Q */ + +static struct page *dataptrs[NDISKS]; +static struct page *data[NDISKS+3]; +static struct page *spare; +static struct page *recovi; +static struct page *recovj; + +static void callback(void *param) +{ + struct completion *cmp = param; + + complete(cmp); +} + +static void makedata(int disks) +{ + int i, j; + + for (i = 0; i < disks; i++) { + for (j = 0; j < PAGE_SIZE/sizeof(u32); j += sizeof(u32)) { + u32 *p = page_address(data[i]) + j; + + *p = random32(); + } + + dataptrs[i] = data[i]; + } +} + +static char disk_type(int d, int disks) +{ + if (d == disks - 2) + return 'P'; + else if (d == disks - 1) + return 'Q'; + else + return 'D'; +} + +/* Recover two failed blocks. */ +static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs) +{ + struct async_submit_ctl submit; + addr_conv_t addr_conv[disks]; + struct completion cmp; + struct dma_async_tx_descriptor *tx = NULL; + enum sum_check_flags result = ~0; + + if (faila > failb) + swap(faila, failb); + + if (failb == disks-1) { + if (faila == disks-2) { + /* P+Q failure. Just rebuild the syndrome. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit); + } else { + struct page *blocks[disks]; + struct page *dest; + int count = 0; + int i; + + /* data+Q failure. Reconstruct data from P, + * then rebuild syndrome + */ + for (i = disks; i-- ; ) { + if (i == faila || i == failb) + continue; + blocks[count++] = ptrs[i]; + } + dest = ptrs[faila]; + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + NULL, NULL, addr_conv); + tx = async_xor(dest, blocks, 0, count, bytes, &submit); + + init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv); + tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit); + } + } else { + if (failb == disks-2) { + /* data+P failure. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit); + } else { + /* data+data failure. */ + init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv); + tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit); + } + } + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv); + tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit); + async_tx_issue_pending(tx); + + if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) + pr("%s: timeout! (faila: %d failb: %d disks: %d)\n", + __func__, faila, failb, disks); + + if (result != 0) + pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n", + __func__, faila, failb, result); +} + +static int test_disks(int i, int j, int disks) +{ + int erra, errb; + + memset(page_address(recovi), 0xf0, PAGE_SIZE); + memset(page_address(recovj), 0xba, PAGE_SIZE); + + dataptrs[i] = recovi; + dataptrs[j] = recovj; + + raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs); + + erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE); + errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE); + + pr("%s(%d, %d): faila=%3d(%c) failb=%3d(%c) %s\n", + __func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks), + (!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB"); + + dataptrs[i] = data[i]; + dataptrs[j] = data[j]; + + return erra || errb; +} + +static int test(int disks, int *tests) +{ + addr_conv_t addr_conv[disks]; + struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; + struct completion cmp; + int err = 0; + int i, j; + + recovi = data[disks]; + recovj = data[disks+1]; + spare = data[disks+2]; + + makedata(disks); + + /* Nuke syndromes */ + memset(page_address(data[disks-2]), 0xee, PAGE_SIZE); + memset(page_address(data[disks-1]), 0xee, PAGE_SIZE); + + /* Generate assumed good syndrome */ + init_completion(&cmp); + init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv); + tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit); + async_tx_issue_pending(tx); + + if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) { + pr("error: initial gen_syndrome(%d) timed out\n", disks); + return 1; + } + + pr("testing the %d-disk case...\n", disks); + for (i = 0; i < disks-1; i++) + for (j = i+1; j < disks; j++) { + (*tests)++; + err += test_disks(i, j, disks); + } + + return err; +} + + +static int raid6_test(void) +{ + int err = 0; + int tests = 0; + int i; + + for (i = 0; i < NDISKS+3; i++) { + data[i] = alloc_page(GFP_KERNEL); + if (!data[i]) { + while (i--) + put_page(data[i]); + return -ENOMEM; + } + } + + /* the 4-disk and 5-disk cases are special for the recovery code */ + if (NDISKS > 4) + err += test(4, &tests); + if (NDISKS > 5) + err += test(5, &tests); + err += test(NDISKS, &tests); + + pr("\n"); + pr("complete (%d tests, %d failure%s)\n", + tests, err, err == 1 ? "" : "s"); + + for (i = 0; i < NDISKS+3; i++) + put_page(data[i]); + + return 0; +} + +static void raid6_test_exit(void) +{ +} + +/* when compiled-in wait for drivers to load first (assumes dma drivers + * are also compliled-in) + */ +late_initcall(raid6_test); +module_exit(raid6_test_exit); +MODULE_AUTHOR("Dan Williams "); +MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests"); +MODULE_LICENSE("GPL"); diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 36e0675be9f..41b3ae25b81 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -155,6 +155,19 @@ config MD_RAID456 config MD_RAID6_PQ tristate +config ASYNC_RAID6_TEST + tristate "Self test for hardware accelerated raid6 recovery" + depends on MD_RAID6_PQ + select ASYNC_RAID6_RECOV + ---help--- + This is a one-shot self test that permutes through the + recovery of all the possible two disk failure scenarios for a + N-disk array. Recovery is performed with the asynchronous + raid6 recovery routines, and will optionally use an offload + engine if one is available. + + If unsure, say N. + config MD_MULTIPATH tristate "Multipath I/O support" depends on BLK_DEV_MD From 507fbec4cff442ebce6706db34603bfb9cc3b5a9 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:12:39 -0700 Subject: [PATCH 16/91] iop-adma: cleanup iop_adma_run_tx_complete_actions Replace 'desc->async_tx.' with 'tx->' [ Impact: pure cleanup ] Signed-off-by: Dan Williams --- drivers/dma/iop-adma.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 4496bc60666..ce45f3fb034 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -61,17 +61,18 @@ static dma_cookie_t iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, struct iop_adma_chan *iop_chan, dma_cookie_t cookie) { - BUG_ON(desc->async_tx.cookie < 0); - if (desc->async_tx.cookie > 0) { - cookie = desc->async_tx.cookie; - desc->async_tx.cookie = 0; + struct dma_async_tx_descriptor *tx = &desc->async_tx; + + BUG_ON(tx->cookie < 0); + if (tx->cookie > 0) { + cookie = tx->cookie; + tx->cookie = 0; /* call the callback (must not sleep or submit new * operations to this channel) */ - if (desc->async_tx.callback) - desc->async_tx.callback( - desc->async_tx.callback_param); + if (tx->callback) + tx->callback(tx->callback_param); /* unmap dma addresses * (unmap_single vs unmap_page?) @@ -81,7 +82,7 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, struct device *dev = &iop_chan->device->pdev->dev; u32 len = unmap->unmap_len; - enum dma_ctrl_flags flags = desc->async_tx.flags; + enum dma_ctrl_flags flags = tx->flags; u32 src_cnt; dma_addr_t addr; dma_addr_t dest; @@ -115,7 +116,7 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, } /* run dependent operations */ - dma_run_dependencies(&desc->async_tx); + dma_run_dependencies(tx); return cookie; } From 72be12f0c39df46832403cbfd82e132a883f5ddc Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 13:38:29 -0700 Subject: [PATCH 17/91] iop-adma: fix lockdep false positive lockdep correctly identifies a potential recursive locking case for iop_chan->lock, but in the dependency submission case we expect that the same class will be acquired for both the parent dependency and the child channel. Signed-off-by: Dan Williams --- drivers/dma/iop-adma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index ce45f3fb034..9c752bd295e 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -288,7 +288,12 @@ static void iop_adma_tasklet(unsigned long data) { struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data; - spin_lock(&iop_chan->lock); + /* lockdep will flag depedency submissions as potentially + * recursive locking, this is not the case as a dependency + * submission will never recurse a channels submit routine. + * There are checks in async_tx.c to prevent this. + */ + spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING); __iop_adma_slot_cleanup(iop_chan); spin_unlock(&iop_chan->lock); } From 7bf649aee8ac93ecc280f8745dcf8ec19d7b9fb1 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Aug 2009 14:32:04 -0700 Subject: [PATCH 18/91] iop-adma: P+Q support for iop13xx adma engines iop33x support is not included because that engine is a bit more awkward to handle in that it can either be in xor mode or pq mode. The dmaengine/async_tx layers currently only comprehend static capabilities. Note iop13xx does not support hardware PQ continuation so the driver must handle the DMA_PREP_CONTINUE flag for operations across > 16 sources. From the comment for dma_maxpq: /* When an engine does not support native continuation we need 3 extra * source slots to reuse P and Q with the following coefficients: * 1/ {00} * P : remove P from Q', but use it as a source for P' * 2/ {01} * Q : use Q to continue Q' calculation * 3/ {00} * Q : subtract Q from P' to cancel (2) */ Signed-off-by: Dan Williams --- arch/arm/include/asm/hardware/iop3xx-adma.h | 76 +++++++ arch/arm/include/asm/hardware/iop_adma.h | 1 + arch/arm/mach-iop13xx/include/mach/adma.h | 107 +++++++++ drivers/dma/iop-adma.c | 231 +++++++++++++++++--- 4 files changed, 381 insertions(+), 34 deletions(-) diff --git a/arch/arm/include/asm/hardware/iop3xx-adma.h b/arch/arm/include/asm/hardware/iop3xx-adma.h index 26eefea0231..1a8c7279a28 100644 --- a/arch/arm/include/asm/hardware/iop3xx-adma.h +++ b/arch/arm/include/asm/hardware/iop3xx-adma.h @@ -187,11 +187,74 @@ union iop3xx_desc { void *ptr; }; +/* No support for p+q operations */ +static inline int +iop_chan_pq_slot_count(size_t len, int src_cnt, int *slots_per_op) +{ + BUG(); + return 0; +} + +static inline void +iop_desc_init_pq(struct iop_adma_desc_slot *desc, int src_cnt, + unsigned long flags) +{ + BUG(); +} + +static inline void +iop_desc_set_pq_addr(struct iop_adma_desc_slot *desc, dma_addr_t *addr) +{ + BUG(); +} + +static inline void +iop_desc_set_pq_src_addr(struct iop_adma_desc_slot *desc, int src_idx, + dma_addr_t addr, unsigned char coef) +{ + BUG(); +} + +static inline int +iop_chan_pq_zero_sum_slot_count(size_t len, int src_cnt, int *slots_per_op) +{ + BUG(); + return 0; +} + +static inline void +iop_desc_init_pq_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, + unsigned long flags) +{ + BUG(); +} + +static inline void +iop_desc_set_pq_zero_sum_byte_count(struct iop_adma_desc_slot *desc, u32 len) +{ + BUG(); +} + +#define iop_desc_set_pq_zero_sum_src_addr iop_desc_set_pq_src_addr + +static inline void +iop_desc_set_pq_zero_sum_addr(struct iop_adma_desc_slot *desc, int pq_idx, + dma_addr_t *src) +{ + BUG(); +} + static inline int iop_adma_get_max_xor(void) { return 32; } +static inline int iop_adma_get_max_pq(void) +{ + BUG(); + return 0; +} + static inline u32 iop_chan_get_current_descriptor(struct iop_adma_chan *chan) { int id = chan->device->id; @@ -332,6 +395,11 @@ static inline int iop_chan_zero_sum_slot_count(size_t len, int src_cnt, return slot_cnt; } +static inline int iop_desc_is_pq(struct iop_adma_desc_slot *desc) +{ + return 0; +} + static inline u32 iop_desc_get_dest_addr(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan) { @@ -349,6 +417,14 @@ static inline u32 iop_desc_get_dest_addr(struct iop_adma_desc_slot *desc, return 0; } + +static inline u32 iop_desc_get_qdest_addr(struct iop_adma_desc_slot *desc, + struct iop_adma_chan *chan) +{ + BUG(); + return 0; +} + static inline u32 iop_desc_get_byte_count(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan) { diff --git a/arch/arm/include/asm/hardware/iop_adma.h b/arch/arm/include/asm/hardware/iop_adma.h index 385c6e8cbbd..bbe8a0475ca 100644 --- a/arch/arm/include/asm/hardware/iop_adma.h +++ b/arch/arm/include/asm/hardware/iop_adma.h @@ -106,6 +106,7 @@ struct iop_adma_desc_slot { union { u32 *xor_check_result; u32 *crc32_result; + u32 *pq_check_result; }; }; diff --git a/arch/arm/mach-iop13xx/include/mach/adma.h b/arch/arm/mach-iop13xx/include/mach/adma.h index 1cd31df8924..6d3782d85a9 100644 --- a/arch/arm/mach-iop13xx/include/mach/adma.h +++ b/arch/arm/mach-iop13xx/include/mach/adma.h @@ -150,6 +150,8 @@ static inline int iop_adma_get_max_xor(void) return 16; } +#define iop_adma_get_max_pq iop_adma_get_max_xor + static inline u32 iop_chan_get_current_descriptor(struct iop_adma_chan *chan) { return __raw_readl(ADMA_ADAR(chan)); @@ -211,7 +213,10 @@ iop_chan_xor_slot_count(size_t len, int src_cnt, int *slots_per_op) #define IOP_ADMA_MAX_BYTE_COUNT ADMA_MAX_BYTE_COUNT #define IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT ADMA_MAX_BYTE_COUNT #define IOP_ADMA_XOR_MAX_BYTE_COUNT ADMA_MAX_BYTE_COUNT +#define IOP_ADMA_PQ_MAX_BYTE_COUNT ADMA_MAX_BYTE_COUNT #define iop_chan_zero_sum_slot_count(l, s, o) iop_chan_xor_slot_count(l, s, o) +#define iop_chan_pq_slot_count iop_chan_xor_slot_count +#define iop_chan_pq_zero_sum_slot_count iop_chan_xor_slot_count static inline u32 iop_desc_get_dest_addr(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan) @@ -220,6 +225,13 @@ static inline u32 iop_desc_get_dest_addr(struct iop_adma_desc_slot *desc, return hw_desc->dest_addr; } +static inline u32 iop_desc_get_qdest_addr(struct iop_adma_desc_slot *desc, + struct iop_adma_chan *chan) +{ + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; + return hw_desc->q_dest_addr; +} + static inline u32 iop_desc_get_byte_count(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan) { @@ -319,6 +331,58 @@ iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, return 1; } +static inline void +iop_desc_init_pq(struct iop_adma_desc_slot *desc, int src_cnt, + unsigned long flags) +{ + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; + union { + u32 value; + struct iop13xx_adma_desc_ctrl field; + } u_desc_ctrl; + + u_desc_ctrl.value = 0; + u_desc_ctrl.field.src_select = src_cnt - 1; + u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */ + u_desc_ctrl.field.pq_xfer_en = 1; + u_desc_ctrl.field.p_xfer_dis = !!(flags & DMA_PREP_PQ_DISABLE_P); + u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT; + hw_desc->desc_ctrl = u_desc_ctrl.value; +} + +static inline int iop_desc_is_pq(struct iop_adma_desc_slot *desc) +{ + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; + union { + u32 value; + struct iop13xx_adma_desc_ctrl field; + } u_desc_ctrl; + + u_desc_ctrl.value = hw_desc->desc_ctrl; + return u_desc_ctrl.field.pq_xfer_en; +} + +static inline void +iop_desc_init_pq_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, + unsigned long flags) +{ + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; + union { + u32 value; + struct iop13xx_adma_desc_ctrl field; + } u_desc_ctrl; + + u_desc_ctrl.value = 0; + u_desc_ctrl.field.src_select = src_cnt - 1; + u_desc_ctrl.field.xfer_dir = 3; /* local to internal bus */ + u_desc_ctrl.field.zero_result = 1; + u_desc_ctrl.field.status_write_back_en = 1; + u_desc_ctrl.field.pq_xfer_en = 1; + u_desc_ctrl.field.p_xfer_dis = !!(flags & DMA_PREP_PQ_DISABLE_P); + u_desc_ctrl.field.int_en = flags & DMA_PREP_INTERRUPT; + hw_desc->desc_ctrl = u_desc_ctrl.value; +} + static inline void iop_desc_set_byte_count(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan, u32 byte_count) @@ -351,6 +415,7 @@ iop_desc_set_zero_sum_byte_count(struct iop_adma_desc_slot *desc, u32 len) } } +#define iop_desc_set_pq_zero_sum_byte_count iop_desc_set_zero_sum_byte_count static inline void iop_desc_set_dest_addr(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan, @@ -361,6 +426,16 @@ static inline void iop_desc_set_dest_addr(struct iop_adma_desc_slot *desc, hw_desc->upper_dest_addr = 0; } +static inline void +iop_desc_set_pq_addr(struct iop_adma_desc_slot *desc, dma_addr_t *addr) +{ + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc; + + hw_desc->dest_addr = addr[0]; + hw_desc->q_dest_addr = addr[1]; + hw_desc->upper_dest_addr = 0; +} + static inline void iop_desc_set_memcpy_src_addr(struct iop_adma_desc_slot *desc, dma_addr_t addr) { @@ -388,6 +463,29 @@ static inline void iop_desc_set_xor_src_addr(struct iop_adma_desc_slot *desc, } while (slot_cnt); } +static inline void +iop_desc_set_pq_src_addr(struct iop_adma_desc_slot *desc, int src_idx, + dma_addr_t addr, unsigned char coef) +{ + int slot_cnt = desc->slot_cnt, slots_per_op = desc->slots_per_op; + struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc, *iter; + struct iop13xx_adma_src *src; + int i = 0; + + do { + iter = iop_hw_desc_slot_idx(hw_desc, i); + src = &iter->src[src_idx]; + src->src_addr = addr; + src->pq_upper_src_addr = 0; + src->pq_dmlt = coef; + slot_cnt -= slots_per_op; + if (slot_cnt) { + i += slots_per_op; + addr += IOP_ADMA_PQ_MAX_BYTE_COUNT; + } + } while (slot_cnt); +} + static inline void iop_desc_init_interrupt(struct iop_adma_desc_slot *desc, struct iop_adma_chan *chan) @@ -399,6 +497,15 @@ iop_desc_init_interrupt(struct iop_adma_desc_slot *desc, } #define iop_desc_set_zero_sum_src_addr iop_desc_set_xor_src_addr +#define iop_desc_set_pq_zero_sum_src_addr iop_desc_set_pq_src_addr + +static inline void +iop_desc_set_pq_zero_sum_addr(struct iop_adma_desc_slot *desc, int pq_idx, + dma_addr_t *src) +{ + iop_desc_set_xor_src_addr(desc, pq_idx, src[pq_idx]); + iop_desc_set_xor_src_addr(desc, pq_idx+1, src[pq_idx+1]); +} static inline void iop_desc_set_next_desc(struct iop_adma_desc_slot *desc, u32 next_desc_addr) diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 9c752bd295e..5a0f4fe2ee6 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -57,6 +57,80 @@ static void iop_adma_free_slots(struct iop_adma_desc_slot *slot) } } +static void +iop_desc_unmap(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc) +{ + struct dma_async_tx_descriptor *tx = &desc->async_tx; + struct iop_adma_desc_slot *unmap = desc->group_head; + struct device *dev = &iop_chan->device->pdev->dev; + u32 len = unmap->unmap_len; + enum dma_ctrl_flags flags = tx->flags; + u32 src_cnt; + dma_addr_t addr; + dma_addr_t dest; + + src_cnt = unmap->unmap_src_cnt; + dest = iop_desc_get_dest_addr(unmap, iop_chan); + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + enum dma_data_direction dir; + + if (src_cnt > 1) /* is xor? */ + dir = DMA_BIDIRECTIONAL; + else + dir = DMA_FROM_DEVICE; + + dma_unmap_page(dev, dest, len, dir); + } + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + while (src_cnt--) { + addr = iop_desc_get_src_addr(unmap, iop_chan, src_cnt); + if (addr == dest) + continue; + dma_unmap_page(dev, addr, len, DMA_TO_DEVICE); + } + } + desc->group_head = NULL; +} + +static void +iop_desc_unmap_pq(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc) +{ + struct dma_async_tx_descriptor *tx = &desc->async_tx; + struct iop_adma_desc_slot *unmap = desc->group_head; + struct device *dev = &iop_chan->device->pdev->dev; + u32 len = unmap->unmap_len; + enum dma_ctrl_flags flags = tx->flags; + u32 src_cnt = unmap->unmap_src_cnt; + dma_addr_t pdest = iop_desc_get_dest_addr(unmap, iop_chan); + dma_addr_t qdest = iop_desc_get_qdest_addr(unmap, iop_chan); + int i; + + if (tx->flags & DMA_PREP_CONTINUE) + src_cnt -= 3; + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP) && !desc->pq_check_result) { + dma_unmap_page(dev, pdest, len, DMA_BIDIRECTIONAL); + dma_unmap_page(dev, qdest, len, DMA_BIDIRECTIONAL); + } + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + dma_addr_t addr; + + for (i = 0; i < src_cnt; i++) { + addr = iop_desc_get_src_addr(unmap, iop_chan, i); + dma_unmap_page(dev, addr, len, DMA_TO_DEVICE); + } + if (desc->pq_check_result) { + dma_unmap_page(dev, pdest, len, DMA_TO_DEVICE); + dma_unmap_page(dev, qdest, len, DMA_TO_DEVICE); + } + } + + desc->group_head = NULL; +} + + static dma_cookie_t iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, struct iop_adma_chan *iop_chan, dma_cookie_t cookie) @@ -78,40 +152,10 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, * (unmap_single vs unmap_page?) */ if (desc->group_head && desc->unmap_len) { - struct iop_adma_desc_slot *unmap = desc->group_head; - struct device *dev = - &iop_chan->device->pdev->dev; - u32 len = unmap->unmap_len; - enum dma_ctrl_flags flags = tx->flags; - u32 src_cnt; - dma_addr_t addr; - dma_addr_t dest; - - src_cnt = unmap->unmap_src_cnt; - dest = iop_desc_get_dest_addr(unmap, iop_chan); - if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - enum dma_data_direction dir; - - if (src_cnt > 1) /* is xor? */ - dir = DMA_BIDIRECTIONAL; - else - dir = DMA_FROM_DEVICE; - - dma_unmap_page(dev, dest, len, dir); - } - - if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - while (src_cnt--) { - addr = iop_desc_get_src_addr(unmap, - iop_chan, - src_cnt); - if (addr == dest) - continue; - dma_unmap_page(dev, addr, len, - DMA_TO_DEVICE); - } - } - desc->group_head = NULL; + if (iop_desc_is_pq(desc)) + iop_desc_unmap_pq(iop_chan, desc); + else + iop_desc_unmap(iop_chan, desc); } } @@ -702,6 +746,118 @@ iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src, return sw_desc ? &sw_desc->async_tx : NULL; } +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *g; + int slot_cnt, slots_per_op; + int continue_srcs; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, + "%s src_cnt: %d len: %u flags: %lx\n", + __func__, src_cnt, len, flags); + + if (dmaf_p_disabled_continue(flags)) + continue_srcs = 1+src_cnt; + else if (dmaf_continue(flags)) + continue_srcs = 3+src_cnt; + else + continue_srcs = 0+src_cnt; + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + int i; + + g = sw_desc->group_head; + iop_desc_set_byte_count(g, iop_chan, len); + + /* even if P is disabled its destination address (bits + * [3:0]) must match Q. It is ok if P points to an + * invalid address, it won't be written. + */ + if (flags & DMA_PREP_PQ_DISABLE_P) + dst[0] = dst[1] & 0x7; + + iop_desc_set_pq_addr(g, dst); + sw_desc->unmap_src_cnt = src_cnt; + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + for (i = 0; i < src_cnt; i++) + iop_desc_set_pq_src_addr(g, i, src[i], scf[i]); + + /* if we are continuing a previous operation factor in + * the old p and q values, see the comment for dma_maxpq + * in include/linux/dmaengine.h + */ + if (dmaf_p_disabled_continue(flags)) + iop_desc_set_pq_src_addr(g, i++, dst[1], 1); + else if (dmaf_continue(flags)) { + iop_desc_set_pq_src_addr(g, i++, dst[0], 0); + iop_desc_set_pq_src_addr(g, i++, dst[1], 1); + iop_desc_set_pq_src_addr(g, i++, dst[1], 0); + } + iop_desc_init_pq(g, i, flags); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, enum sum_check_flags *pqres, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *g; + int slot_cnt, slots_per_op; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", + __func__, src_cnt, len); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + /* for validate operations p and q are tagged onto the + * end of the source list + */ + int pq_idx = src_cnt; + + g = sw_desc->group_head; + iop_desc_init_pq_zero_sum(g, src_cnt+2, flags); + iop_desc_set_pq_zero_sum_byte_count(g, len); + g->pq_check_result = pqres; + pr_debug("\t%s: g->pq_check_result: %p\n", + __func__, g->pq_check_result); + sw_desc->unmap_src_cnt = src_cnt+2; + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + while (src_cnt--) + iop_desc_set_pq_zero_sum_src_addr(g, src_cnt, + src[src_cnt], + scf[src_cnt]); + iop_desc_set_pq_zero_sum_addr(g, pq_idx, src); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + static void iop_adma_free_chan_resources(struct dma_chan *chan) { struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); @@ -1201,6 +1357,13 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask)) dma_dev->device_prep_dma_xor_val = iop_adma_prep_dma_xor_val; + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0); + dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq; + } + if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) + dma_dev->device_prep_dma_pq_val = + iop_adma_prep_dma_pq_val; if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) dma_dev->device_prep_dma_interrupt = iop_adma_prep_dma_interrupt; From f6dbf651615900646fe0ba1ef5ce1027e5b4748d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:12:40 -0700 Subject: [PATCH 19/91] iop-adma: P+Q self test Even though the intent is to extend dmatest with P+Q tests there is still value in having an always-on sanity check to prevent an unintentionally broken driver from registering. This depends on raid6_pq.ko for verification, the side effect being that PQ capable channels will fail to register when raid6 is disabled. Signed-off-by: Dan Williams --- drivers/dma/iop-adma.c | 182 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 181 insertions(+), 1 deletion(-) diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 5a0f4fe2ee6..f4c59e59f6c 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -31,6 +31,7 @@ #include #include #include +#include #include @@ -1267,6 +1268,170 @@ out: return err; } +#ifdef CONFIG_MD_RAID6_PQ +static int __devinit +iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device) +{ + /* combined sources, software pq results, and extra hw pq results */ + struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2]; + /* ptr to the extra hw pq buffers defined above */ + struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2]; + /* address conversion buffers (dma_map / page_address) */ + void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2]; + dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST]; + dma_addr_t pq_dest[2]; + + int i; + struct dma_async_tx_descriptor *tx; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u32 zero_sum_result; + int err = 0; + struct device *dev; + + dev_dbg(device->common.dev, "%s\n", __func__); + + for (i = 0; i < ARRAY_SIZE(pq); i++) { + pq[i] = alloc_page(GFP_KERNEL); + if (!pq[i]) { + while (i--) + __free_page(pq[i]); + return -ENOMEM; + } + } + + /* Fill in src buffers */ + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) { + pq_sw[i] = page_address(pq[i]); + memset(pq_sw[i], 0x11111111 * (1<common.channels.next, + struct dma_chan, + device_node); + if (iop_adma_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + dev = dma_chan->device->dev; + + /* initialize the dests */ + memset(page_address(pq_hw[0]), 0 , PAGE_SIZE); + memset(page_address(pq_hw[1]), 0 , PAGE_SIZE); + + /* test pq */ + pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE); + pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src, + IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp, + PAGE_SIZE, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != + DMA_SUCCESS) { + dev_err(dev, "Self-test pq timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw); + + if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST], + page_address(pq_hw[0]), PAGE_SIZE) != 0) { + dev_err(dev, "Self-test p failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1], + page_address(pq_hw[1]), PAGE_SIZE) != 0) { + dev_err(dev, "Self-test q failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + /* test correct zero sum using the software generated pq values */ + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + zero_sum_result = ~0; + tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST], + pq_src, IOP_ADMA_NUM_SRC_TEST, + raid6_gfexp, PAGE_SIZE, &zero_sum_result, + DMA_PREP_INTERRUPT|DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != + DMA_SUCCESS) { + dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != 0) { + dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n", + zero_sum_result); + err = -ENODEV; + goto free_resources; + } + + /* test incorrect zero sum */ + i = IOP_ADMA_NUM_SRC_TEST; + memset(pq_sw[i] + 100, 0, 100); + memset(pq_sw[i+1] + 200, 0, 200); + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + zero_sum_result = 0; + tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST], + pq_src, IOP_ADMA_NUM_SRC_TEST, + raid6_gfexp, PAGE_SIZE, &zero_sum_result, + DMA_PREP_INTERRUPT|DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != + DMA_SUCCESS) { + dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) { + dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n", + zero_sum_result); + err = -ENODEV; + goto free_resources; + } + +free_resources: + iop_adma_free_chan_resources(dma_chan); +out: + i = ARRAY_SIZE(pq); + while (i--) + __free_page(pq[i]); + return err; +} +#endif + static int __devexit iop_adma_remove(struct platform_device *dev) { struct iop_adma_device *device = platform_get_drvdata(dev); @@ -1417,13 +1582,28 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) } if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) || - dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { + dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { ret = iop_adma_xor_val_self_test(adev); dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); if (ret) goto err_free_iop_chan; } + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) && + dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) { + #ifdef CONFIG_MD_RAID6_PQ + ret = iop_adma_pq_zero_sum_self_test(adev); + dev_dbg(&pdev->dev, "pq self test returned %d\n", ret); + #else + /* can not test raid6, so do not publish capability */ + dma_cap_clear(DMA_PQ, dma_dev->cap_mask); + dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask); + ret = 0; + #endif + if (ret) + goto err_free_iop_chan; + } + dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " "( %s%s%s%s%s%s%s%s%s%s)\n", dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "", From 4e7d2c0aefb77f7b24942e5af042a083be4d60bb Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:13:11 -0700 Subject: [PATCH 20/91] md/raid5: factor out mark_uptodate from ops_complete_compute5 ops_complete_compute5 can be reused in the raid6 path if it is updated to generically handle a second target. Signed-off-by: Dan Williams --- drivers/md/raid5.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 1f2a266f3cf..e3a2990bdc7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -623,18 +623,29 @@ static void ops_run_biofill(struct stripe_head *sh) async_trigger_callback(&submit); } +static void mark_target_uptodate(struct stripe_head *sh, int target) +{ + struct r5dev *tgt; + + if (target < 0) + return; + + tgt = &sh->dev[target]; + set_bit(R5_UPTODATE, &tgt->flags); + BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); + clear_bit(R5_Wantcompute, &tgt->flags); +} + static void ops_complete_compute5(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; - int target = sh->ops.target; - struct r5dev *tgt = &sh->dev[target]; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); - set_bit(R5_UPTODATE, &tgt->flags); - BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); - clear_bit(R5_Wantcompute, &tgt->flags); + /* mark the computed target as uptodate */ + mark_target_uptodate(sh, sh->ops.target); + clear_bit(STRIPE_COMPUTE_RUN, &sh->state); if (sh->check_state == check_state_compute_run) sh->check_state = check_state_compute_result; From ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 13:40:19 -0700 Subject: [PATCH 21/91] md/raid6: asynchronous raid6 operations [ Based on an original patch by Yuri Tikhonov ] The raid_run_ops routine uses the asynchronous offload api and the stripe_operations member of a stripe_head to carry out xor+pq+copy operations asynchronously, outside the lock. The operations performed by RAID-6 are the same as in the RAID-5 case except for no support of STRIPE_OP_PREXOR operations. All the others are supported: STRIPE_OP_BIOFILL - copy data into request buffers to satisfy a read request STRIPE_OP_COMPUTE_BLK - generate missing blocks (1 or 2) in the cache from the other blocks STRIPE_OP_BIODRAIN - copy data out of request buffers to satisfy a write request STRIPE_OP_RECONSTRUCT - recalculate parity for new data that has entered the cache STRIPE_OP_CHECK - verify that the parity is correct The flow is the same as in the RAID-5 case, and reuses some routines, namely: 1/ ops_complete_postxor (renamed to ops_complete_reconstruct) 2/ ops_complete_compute (updated to set up to 2 targets uptodate) 3/ ops_run_check (renamed to ops_run_check_p for xor parity checks) [neilb@suse.de: fixes to get it to pass mdadm regression suite] Reviewed-by: Andre Noll Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/Kconfig | 2 + drivers/md/raid5.c | 322 ++++++++++++++++++++++++++++++++++++++++----- drivers/md/raid5.h | 8 +- 3 files changed, 299 insertions(+), 33 deletions(-) diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 41b3ae25b81..abb8636bfde 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -124,6 +124,8 @@ config MD_RAID456 select MD_RAID6_PQ select ASYNC_MEMCPY select ASYNC_XOR + select ASYNC_PQ + select ASYNC_RAID6_RECOV ---help--- A RAID-5 set of N drives with a capacity of C MB per drive provides the capacity of C * (N - 1) MB, and protects against a failure diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index e3a2990bdc7..e68616ed3e7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -636,15 +636,16 @@ static void mark_target_uptodate(struct stripe_head *sh, int target) clear_bit(R5_Wantcompute, &tgt->flags); } -static void ops_complete_compute5(void *stripe_head_ref) +static void ops_complete_compute(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); - /* mark the computed target as uptodate */ + /* mark the computed target(s) as uptodate */ mark_target_uptodate(sh, sh->ops.target); + mark_target_uptodate(sh, sh->ops.target2); clear_bit(STRIPE_COMPUTE_RUN, &sh->state); if (sh->check_state == check_state_compute_run) @@ -684,7 +685,7 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) atomic_inc(&sh->count); init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute5, sh, to_addr_conv(sh, percpu)); + ops_complete_compute, sh, to_addr_conv(sh, percpu)); if (unlikely(count == 1)) tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else @@ -693,6 +694,197 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) return tx; } +/* set_syndrome_sources - populate source buffers for gen_syndrome + * @srcs - (struct page *) array of size sh->disks + * @sh - stripe_head to parse + * + * Populates srcs in proper layout order for the stripe and returns the + * 'count' of sources to be used in a call to async_gen_syndrome. The P + * destination buffer is recorded in srcs[count] and the Q destination + * is recorded in srcs[count+1]]. + */ +static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) +{ + int disks = sh->disks; + int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); + int d0_idx = raid6_d0(sh); + int count; + int i; + + for (i = 0; i < disks; i++) + srcs[i] = (void *)raid6_empty_zero_page; + + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + srcs[slot] = sh->dev[i].page; + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); + + return count; +} + +static struct dma_async_tx_descriptor * +ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) +{ + int disks = sh->disks; + struct page **blocks = percpu->scribble; + int target; + int qd_idx = sh->qd_idx; + struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; + struct r5dev *tgt; + struct page *dest; + int i; + int count; + + if (sh->ops.target < 0) + target = sh->ops.target2; + else if (sh->ops.target2 < 0) + target = sh->ops.target; + else + /* we should only have one valid target */ + BUG(); + BUG_ON(target < 0); + pr_debug("%s: stripe %llu block: %d\n", + __func__, (unsigned long long)sh->sector, target); + + tgt = &sh->dev[target]; + BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); + dest = tgt->page; + + atomic_inc(&sh->count); + + if (target == qd_idx) { + count = set_syndrome_sources(blocks, sh); + blocks[count] = NULL; /* regenerating p is not necessary */ + BUG_ON(blocks[count+1] != dest); /* q should already be set */ + init_async_submit(&submit, 0, NULL, ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); + } else { + /* Compute any data- or p-drive using XOR */ + count = 0; + for (i = disks; i-- ; ) { + if (i == target || i == qd_idx) + continue; + blocks[count++] = sh->dev[i].page; + } + + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); + } + + return tx; +} + +static struct dma_async_tx_descriptor * +ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) +{ + int i, count, disks = sh->disks; + int syndrome_disks = sh->ddf_layout ? disks : disks-2; + int d0_idx = raid6_d0(sh); + int faila = -1, failb = -1; + int target = sh->ops.target; + int target2 = sh->ops.target2; + struct r5dev *tgt = &sh->dev[target]; + struct r5dev *tgt2 = &sh->dev[target2]; + struct dma_async_tx_descriptor *tx; + struct page **blocks = percpu->scribble; + struct async_submit_ctl submit; + + pr_debug("%s: stripe %llu block1: %d block2: %d\n", + __func__, (unsigned long long)sh->sector, target, target2); + BUG_ON(target < 0 || target2 < 0); + BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); + BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); + + /* we need to open-code set_syndrome_sources to handle to the + * slot number conversion for 'faila' and 'failb' + */ + for (i = 0; i < disks ; i++) + blocks[i] = (void *)raid6_empty_zero_page; + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + blocks[slot] = sh->dev[i].page; + + if (i == target) + faila = slot; + if (i == target2) + failb = slot; + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); + + BUG_ON(faila == failb); + if (failb < faila) + swap(faila, failb); + pr_debug("%s: stripe: %llu faila: %d failb: %d\n", + __func__, (unsigned long long)sh->sector, faila, failb); + + atomic_inc(&sh->count); + + if (failb == syndrome_disks+1) { + /* Q disk is one of the missing disks */ + if (faila == syndrome_disks) { + /* Missing P+Q, just recompute */ + init_async_submit(&submit, 0, NULL, ops_complete_compute, + sh, to_addr_conv(sh, percpu)); + return async_gen_syndrome(blocks, 0, count+2, + STRIPE_SIZE, &submit); + } else { + struct page *dest; + int data_target; + int qd_idx = sh->qd_idx; + + /* Missing D+Q: recompute D from P, then recompute Q */ + if (target == qd_idx) + data_target = target2; + else + data_target = target; + + count = 0; + for (i = disks; i-- ; ) { + if (i == data_target || i == qd_idx) + continue; + blocks[count++] = sh->dev[i].page; + } + dest = sh->dev[data_target].page; + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + NULL, NULL, to_addr_conv(sh, percpu)); + tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, + &submit); + + count = set_syndrome_sources(blocks, sh); + init_async_submit(&submit, 0, tx, ops_complete_compute, + sh, to_addr_conv(sh, percpu)); + return async_gen_syndrome(blocks, 0, count+2, + STRIPE_SIZE, &submit); + } + } + + init_async_submit(&submit, 0, NULL, ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + if (failb == syndrome_disks) { + /* We're missing D+P. */ + return async_raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, + faila, blocks, &submit); + } else { + /* We're missing D+D. */ + return async_raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, + faila, failb, blocks, &submit); + } +} + + static void ops_complete_prexor(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; @@ -765,17 +957,21 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) return tx; } -static void ops_complete_postxor(void *stripe_head_ref) +static void ops_complete_reconstruct(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; - int disks = sh->disks, i, pd_idx = sh->pd_idx; + int disks = sh->disks; + int pd_idx = sh->pd_idx; + int qd_idx = sh->qd_idx; + int i; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; - if (dev->written || i == pd_idx) + + if (dev->written || i == pd_idx || i == qd_idx) set_bit(R5_UPTODATE, &dev->flags); } @@ -793,8 +989,8 @@ static void ops_complete_postxor(void *stripe_head_ref) } static void -ops_run_postxor(struct stripe_head *sh, struct raid5_percpu *percpu, - struct dma_async_tx_descriptor *tx) +ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) { int disks = sh->disks; struct page **xor_srcs = percpu->scribble; @@ -837,7 +1033,7 @@ ops_run_postxor(struct stripe_head *sh, struct raid5_percpu *percpu, atomic_inc(&sh->count); - init_async_submit(&submit, flags, tx, ops_complete_postxor, sh, + init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, to_addr_conv(sh, percpu)); if (unlikely(count == 1)) tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); @@ -845,6 +1041,25 @@ ops_run_postxor(struct stripe_head *sh, struct raid5_percpu *percpu, tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); } +static void +ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) +{ + struct async_submit_ctl submit; + struct page **blocks = percpu->scribble; + int count; + + pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); + + count = set_syndrome_sources(blocks, sh); + + atomic_inc(&sh->count); + + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, + sh, to_addr_conv(sh, percpu)); + async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); +} + static void ops_complete_check(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; @@ -857,23 +1072,28 @@ static void ops_complete_check(void *stripe_head_ref) release_stripe(sh); } -static void ops_run_check(struct stripe_head *sh, struct raid5_percpu *percpu) +static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) { int disks = sh->disks; + int pd_idx = sh->pd_idx; + int qd_idx = sh->qd_idx; + struct page *xor_dest; struct page **xor_srcs = percpu->scribble; struct dma_async_tx_descriptor *tx; struct async_submit_ctl submit; - - int count = 0, pd_idx = sh->pd_idx, i; - struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; + int count; + int i; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); + count = 0; + xor_dest = sh->dev[pd_idx].page; + xor_srcs[count++] = xor_dest; for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (i != pd_idx) - xor_srcs[count++] = dev->page; + if (i == pd_idx || i == qd_idx) + continue; + xor_srcs[count++] = sh->dev[i].page; } init_async_submit(&submit, 0, NULL, NULL, NULL, @@ -886,11 +1106,32 @@ static void ops_run_check(struct stripe_head *sh, struct raid5_percpu *percpu) tx = async_trigger_callback(&submit); } -static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) +static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) +{ + struct page **srcs = percpu->scribble; + struct async_submit_ctl submit; + int count; + + pr_debug("%s: stripe %llu checkp: %d\n", __func__, + (unsigned long long)sh->sector, checkp); + + count = set_syndrome_sources(srcs, sh); + if (!checkp) + srcs[count] = NULL; + + atomic_inc(&sh->count); + init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, + sh, to_addr_conv(sh, percpu)); + async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, + &sh->ops.zero_sum_result, percpu->spare_page, &submit); +} + +static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) { int overlap_clear = 0, i, disks = sh->disks; struct dma_async_tx_descriptor *tx = NULL; raid5_conf_t *conf = sh->raid_conf; + int level = conf->level; struct raid5_percpu *percpu; unsigned long cpu; @@ -902,9 +1143,16 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) } if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { - tx = ops_run_compute5(sh, percpu); - /* terminate the chain if postxor is not set to be run */ - if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) + if (level < 6) + tx = ops_run_compute5(sh, percpu); + else { + if (sh->ops.target2 < 0 || sh->ops.target < 0) + tx = ops_run_compute6_1(sh, percpu); + else + tx = ops_run_compute6_2(sh, percpu); + } + /* terminate the chain if reconstruct is not set to be run */ + if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) async_tx_ack(tx); } @@ -916,11 +1164,23 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) overlap_clear++; } - if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) - ops_run_postxor(sh, percpu, tx); + if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { + if (level < 6) + ops_run_reconstruct5(sh, percpu, tx); + else + ops_run_reconstruct6(sh, percpu, tx); + } - if (test_bit(STRIPE_OP_CHECK, &ops_request)) - ops_run_check(sh, percpu); + if (test_bit(STRIPE_OP_CHECK, &ops_request)) { + if (sh->check_state == check_state_run) + ops_run_check_p(sh, percpu); + else if (sh->check_state == check_state_run_q) + ops_run_check_pq(sh, percpu, 0); + else if (sh->check_state == check_state_run_pq) + ops_run_check_pq(sh, percpu, 1); + else + BUG(); + } if (overlap_clear) for (i = disks; i--; ) { @@ -1931,7 +2191,7 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, } else sh->reconstruct_state = reconstruct_state_run; - set_bit(STRIPE_OP_POSTXOR, &s->ops_request); + set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -1954,7 +2214,7 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, sh->reconstruct_state = reconstruct_state_prexor_drain_run; set_bit(STRIPE_OP_PREXOR, &s->ops_request); set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); - set_bit(STRIPE_OP_POSTXOR, &s->ops_request); + set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -2206,9 +2466,10 @@ static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); set_bit(R5_Wantcompute, &dev->flags); sh->ops.target = disk_idx; + sh->ops.target2 = -1; s->req_compute = 1; /* Careful: from this point on 'uptodate' is in the eye - * of raid5_run_ops which services 'compute' operations + * of raid_run_ops which services 'compute' operations * before writes. R5_Wantcompute flags a block that will * be R5_UPTODATE by the time it is needed for a * subsequent operation. @@ -2435,8 +2696,8 @@ static void handle_stripe_dirtying5(raid5_conf_t *conf, */ /* since handle_stripe can be called at any time we need to handle the * case where a compute block operation has been submitted and then a - * subsequent call wants to start a write request. raid5_run_ops only - * handles the case where compute block and postxor are requested + * subsequent call wants to start a write request. raid_run_ops only + * handles the case where compute block and reconstruct are requested * simultaneously. If this is not the case then new writes need to be * held off until the compute completes. */ @@ -2618,6 +2879,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, set_bit(R5_Wantcompute, &sh->dev[sh->pd_idx].flags); sh->ops.target = sh->pd_idx; + sh->ops.target2 = -1; s->uptodate++; } } @@ -3067,7 +3329,7 @@ static bool handle_stripe5(struct stripe_head *sh) md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); if (s.ops_request) - raid5_run_ops(sh, s.ops_request); + raid_run_ops(sh, s.ops_request); ops_run_io(sh, &s); diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 75f2c6c4cf9..116d0b44b2a 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -176,7 +176,9 @@ */ enum check_states { check_state_idle = 0, - check_state_run, /* parity check */ + check_state_run, /* xor parity check */ + check_state_run_q, /* q-parity check */ + check_state_run_pq, /* pq dual parity check */ check_state_check_result, check_state_compute_run, /* parity repair */ check_state_compute_result, @@ -216,7 +218,7 @@ struct stripe_head { * @target - STRIPE_OP_COMPUTE_BLK target */ struct stripe_operations { - int target; + int target, target2; enum sum_check_flags zero_sum_result; } ops; struct r5dev { @@ -299,7 +301,7 @@ struct r6_state { #define STRIPE_OP_COMPUTE_BLK 1 #define STRIPE_OP_PREXOR 2 #define STRIPE_OP_BIODRAIN 3 -#define STRIPE_OP_POSTXOR 4 +#define STRIPE_OP_RECONSTRUCT 4 #define STRIPE_OP_CHECK 5 /* From c0f7bddbe60f43578dccf4ffb8d4bff88f625ea7 Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sat, 29 Aug 2009 19:13:12 -0700 Subject: [PATCH 22/91] md/raid5,6: common schedule_reconstruction for raid5/6 Extend schedule_reconstruction5 for reuse by the raid6 path. Add support for generating Q and BUG() if a request is made to perform 'prexor'. Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index e68616ed3e7..a1245cf9995 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2175,10 +2175,12 @@ static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) } static void -schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, +schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, int rcw, int expand) { int i, pd_idx = sh->pd_idx, disks = sh->disks; + raid5_conf_t *conf = sh->raid_conf; + int level = conf->level; if (rcw) { /* if we are not expanding this is a proper write request, and @@ -2204,10 +2206,11 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, s->locked++; } } - if (s->locked + 1 == disks) + if (s->locked + conf->max_degraded == disks) if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) - atomic_inc(&sh->raid_conf->pending_full_writes); + atomic_inc(&conf->pending_full_writes); } else { + BUG_ON(level == 6); BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); @@ -2232,13 +2235,22 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, } } - /* keep the parity disk locked while asynchronous operations + /* keep the parity disk(s) locked while asynchronous operations * are in flight */ set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); s->locked++; + if (level == 6) { + int qd_idx = sh->qd_idx; + struct r5dev *dev = &sh->dev[qd_idx]; + + set_bit(R5_LOCKED, &dev->flags); + clear_bit(R5_UPTODATE, &dev->flags); + s->locked++; + } + pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", __func__, (unsigned long long)sh->sector, s->locked, s->ops_request); @@ -2704,7 +2716,7 @@ static void handle_stripe_dirtying5(raid5_conf_t *conf, if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && (s->locked == 0 && (rcw == 0 || rmw == 0) && !test_bit(STRIPE_BIT_DELAY, &sh->state))) - schedule_reconstruction5(sh, s, rcw == 0, 0); + schedule_reconstruction(sh, s, rcw == 0, 0); } static void handle_stripe_dirtying6(raid5_conf_t *conf, @@ -3309,7 +3321,7 @@ static bool handle_stripe5(struct stripe_head *sh) /* Need to write out all blocks after computing parity */ sh->disks = conf->raid_disks; stripe_set_idx(sh->sector, conf, 0, sh); - schedule_reconstruction5(sh, &s, 1, 1); + schedule_reconstruction(sh, &s, 1, 1); } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { clear_bit(STRIPE_EXPAND_READY, &sh->state); atomic_dec(&conf->reshape_stripes); From 5599becca4bee7badf605e41fd5bcde76d51f2a4 Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sat, 29 Aug 2009 19:13:12 -0700 Subject: [PATCH 23/91] md/raid6: asynchronous handle_stripe_fill6 Modify handle_stripe_fill6 to work asynchronously by introducing fetch_block6 as the raid6 analog of fetch_block5 (schedule compute operations for missing/out-of-sync disks). [dan.j.williams@intel.com: compute D+Q in one pass] Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 143 +++++++++++++++++++++++++++++---------------- 1 file changed, 93 insertions(+), 50 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index a1245cf9995..49da6f74d6d 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2520,61 +2520,104 @@ static void handle_stripe_fill5(struct stripe_head *sh, set_bit(STRIPE_HANDLE, &sh->state); } +/* fetch_block6 - checks the given member device to see if its data needs + * to be read or computed to satisfy a request. + * + * Returns 1 when no more member devices need to be checked, otherwise returns + * 0 to tell the loop in handle_stripe_fill6 to continue + */ +static int fetch_block6(struct stripe_head *sh, struct stripe_head_state *s, + struct r6_state *r6s, int disk_idx, int disks) +{ + struct r5dev *dev = &sh->dev[disk_idx]; + struct r5dev *fdev[2] = { &sh->dev[r6s->failed_num[0]], + &sh->dev[r6s->failed_num[1]] }; + + if (!test_bit(R5_LOCKED, &dev->flags) && + !test_bit(R5_UPTODATE, &dev->flags) && + (dev->toread || + (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || + s->syncing || s->expanding || + (s->failed >= 1 && + (fdev[0]->toread || s->to_write)) || + (s->failed >= 2 && + (fdev[1]->toread || s->to_write)))) { + /* we would like to get this block, possibly by computing it, + * otherwise read it if the backing disk is insync + */ + BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); + BUG_ON(test_bit(R5_Wantread, &dev->flags)); + if ((s->uptodate == disks - 1) && + (s->failed && (disk_idx == r6s->failed_num[0] || + disk_idx == r6s->failed_num[1]))) { + /* have disk failed, and we're requested to fetch it; + * do compute it + */ + pr_debug("Computing stripe %llu block %d\n", + (unsigned long long)sh->sector, disk_idx); + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + set_bit(R5_Wantcompute, &dev->flags); + sh->ops.target = disk_idx; + sh->ops.target2 = -1; /* no 2nd target */ + s->req_compute = 1; + s->uptodate++; + return 1; + } else if (s->uptodate == disks-2 && s->failed >= 2) { + /* Computing 2-failure is *very* expensive; only + * do it if failed >= 2 + */ + int other; + for (other = disks; other--; ) { + if (other == disk_idx) + continue; + if (!test_bit(R5_UPTODATE, + &sh->dev[other].flags)) + break; + } + BUG_ON(other < 0); + pr_debug("Computing stripe %llu blocks %d,%d\n", + (unsigned long long)sh->sector, + disk_idx, other); + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); + set_bit(R5_Wantcompute, &sh->dev[other].flags); + sh->ops.target = disk_idx; + sh->ops.target2 = other; + s->uptodate += 2; + s->req_compute = 1; + return 1; + } else if (test_bit(R5_Insync, &dev->flags)) { + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantread, &dev->flags); + s->locked++; + pr_debug("Reading block %d (sync=%d)\n", + disk_idx, s->syncing); + } + } + + return 0; +} + +/** + * handle_stripe_fill6 - read or compute data to satisfy pending requests. + */ static void handle_stripe_fill6(struct stripe_head *sh, struct stripe_head_state *s, struct r6_state *r6s, int disks) { int i; - for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (!test_bit(R5_LOCKED, &dev->flags) && - !test_bit(R5_UPTODATE, &dev->flags) && - (dev->toread || (dev->towrite && - !test_bit(R5_OVERWRITE, &dev->flags)) || - s->syncing || s->expanding || - (s->failed >= 1 && - (sh->dev[r6s->failed_num[0]].toread || - s->to_write)) || - (s->failed >= 2 && - (sh->dev[r6s->failed_num[1]].toread || - s->to_write)))) { - /* we would like to get this block, possibly - * by computing it, but we might not be able to - */ - if ((s->uptodate == disks - 1) && - (s->failed && (i == r6s->failed_num[0] || - i == r6s->failed_num[1]))) { - pr_debug("Computing stripe %llu block %d\n", - (unsigned long long)sh->sector, i); - compute_block_1(sh, i, 0); - s->uptodate++; - } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { - /* Computing 2-failure is *very* expensive; only - * do it if failed >= 2 - */ - int other; - for (other = disks; other--; ) { - if (other == i) - continue; - if (!test_bit(R5_UPTODATE, - &sh->dev[other].flags)) - break; - } - BUG_ON(other < 0); - pr_debug("Computing stripe %llu blocks %d,%d\n", - (unsigned long long)sh->sector, - i, other); - compute_block_2(sh, i, other); - s->uptodate += 2; - } else if (test_bit(R5_Insync, &dev->flags)) { - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantread, &dev->flags); - s->locked++; - pr_debug("Reading block %d (sync=%d)\n", - i, s->syncing); - } - } - } + + /* look for blocks to read/compute, skip this if a compute + * is already in flight, or if the stripe contents are in the + * midst of changing due to a write + */ + if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && + !sh->reconstruct_state) + for (i = disks; i--; ) + if (fetch_block6(sh, s, r6s, i, disks)) + break; set_bit(STRIPE_HANDLE, &sh->state); } From a9b39a741a7e3b262b9f51fefb68e17b32756999 Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sat, 29 Aug 2009 19:13:12 -0700 Subject: [PATCH 24/91] md/raid6: asynchronous handle_stripe_dirtying6 In the synchronous implementation of stripe dirtying we processed a degraded stripe with one call to handle_stripe_dirtying6(). I.e. compute the missing blocks from the other drives, then copy in the new data and reconstruct the parities. In the asynchronous case we do not perform stripe operations directly. Instead, operations are scheduled with flags to be later serviced by raid_run_ops. So, for the degraded case the final reconstruction step can only be carried out after all blocks have been brought up to date by being read, or computed. Like the raid5 case schedule_reconstruction() sets STRIPE_OP_RECONSTRUCT to request a parity generation pass and through operation chaining can handle compute and reconstruct in a single raid_run_ops pass. [dan.j.williams@intel.com: fixup handle_stripe_dirtying6 gating] Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 122 ++++++++++++++------------------------------- 1 file changed, 37 insertions(+), 85 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 49da6f74d6d..08f806379b0 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2766,99 +2766,46 @@ static void handle_stripe_dirtying6(raid5_conf_t *conf, struct stripe_head *sh, struct stripe_head_state *s, struct r6_state *r6s, int disks) { - int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; + int rcw = 0, pd_idx = sh->pd_idx, i; int qd_idx = sh->qd_idx; + + set_bit(STRIPE_HANDLE, &sh->state); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; - /* Would I have to read this buffer for reconstruct_write */ - if (!test_bit(R5_OVERWRITE, &dev->flags) - && i != pd_idx && i != qd_idx - && (!test_bit(R5_LOCKED, &dev->flags) - ) && - !test_bit(R5_UPTODATE, &dev->flags)) { - if (test_bit(R5_Insync, &dev->flags)) rcw++; - else { - pr_debug("raid6: must_compute: " - "disk %d flags=%#lx\n", i, dev->flags); - must_compute++; + /* check if we haven't enough data */ + if (!test_bit(R5_OVERWRITE, &dev->flags) && + i != pd_idx && i != qd_idx && + !test_bit(R5_LOCKED, &dev->flags) && + !(test_bit(R5_UPTODATE, &dev->flags) || + test_bit(R5_Wantcompute, &dev->flags))) { + rcw++; + if (!test_bit(R5_Insync, &dev->flags)) + continue; /* it's a failed drive */ + + if ( + test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { + pr_debug("Read_old stripe %llu " + "block %d for Reconstruct\n", + (unsigned long long)sh->sector, i); + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantread, &dev->flags); + s->locked++; + } else { + pr_debug("Request delayed stripe %llu " + "block %d for Reconstruct\n", + (unsigned long long)sh->sector, i); + set_bit(STRIPE_DELAYED, &sh->state); + set_bit(STRIPE_HANDLE, &sh->state); } } } - pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", - (unsigned long long)sh->sector, rcw, must_compute); - set_bit(STRIPE_HANDLE, &sh->state); - - if (rcw > 0) - /* want reconstruct write, but need to get some data */ - for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (!test_bit(R5_OVERWRITE, &dev->flags) - && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) - && !test_bit(R5_LOCKED, &dev->flags) && - !test_bit(R5_UPTODATE, &dev->flags) && - test_bit(R5_Insync, &dev->flags)) { - if ( - test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { - pr_debug("Read_old stripe %llu " - "block %d for Reconstruct\n", - (unsigned long long)sh->sector, i); - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantread, &dev->flags); - s->locked++; - } else { - pr_debug("Request delayed stripe %llu " - "block %d for Reconstruct\n", - (unsigned long long)sh->sector, i); - set_bit(STRIPE_DELAYED, &sh->state); - set_bit(STRIPE_HANDLE, &sh->state); - } - } - } /* now if nothing is locked, and if we have enough data, we can start a * write request */ - if (s->locked == 0 && rcw == 0 && + if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && + s->locked == 0 && rcw == 0 && !test_bit(STRIPE_BIT_DELAY, &sh->state)) { - if (must_compute > 0) { - /* We have failed blocks and need to compute them */ - switch (s->failed) { - case 0: - BUG(); - case 1: - compute_block_1(sh, r6s->failed_num[0], 0); - break; - case 2: - compute_block_2(sh, r6s->failed_num[0], - r6s->failed_num[1]); - break; - default: /* This request should have been failed? */ - BUG(); - } - } - - pr_debug("Computing parity for stripe %llu\n", - (unsigned long long)sh->sector); - compute_parity6(sh, RECONSTRUCT_WRITE); - /* now every locked buffer is ready to be written */ - for (i = disks; i--; ) - if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { - pr_debug("Writing stripe %llu block %d\n", - (unsigned long long)sh->sector, i); - s->locked++; - set_bit(R5_Wantwrite, &sh->dev[i].flags); - } - if (s->locked == disks) - if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) - atomic_inc(&conf->pending_full_writes); - /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ - set_bit(STRIPE_INSYNC, &sh->state); - - if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { - atomic_dec(&conf->preread_active_stripes); - if (atomic_read(&conf->preread_active_stripes) < - IO_THRESHOLD) - md_wakeup_thread(conf->mddev->thread); - } + schedule_reconstruction(sh, s, 1, 0); } } @@ -3539,8 +3486,13 @@ static bool handle_stripe6(struct stripe_head *sh) (s.syncing && (s.uptodate < disks)) || s.expanding) handle_stripe_fill6(sh, &s, &r6s, disks); - /* now to consider writing and what else, if anything should be read */ - if (s.to_write) + /* Now to consider new write requests and what else, if anything + * should be read. We do not handle new writes when: + * 1/ A 'write' operation (copy+gen_syndrome) is already in flight. + * 2/ A 'check' operation is in flight, as it may clobber the parity + * block. + */ + if (s.to_write && !sh->reconstruct_state && !sh->check_state) handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); /* maybe we need to check and possibly fix the parity for this stripe From d82dfee0ad8f240fef1b28e2258891c07da57367 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 14 Jul 2009 13:40:57 -0700 Subject: [PATCH 25/91] md/raid6: asynchronous handle_parity_check6 [ Based on an original patch by Yuri Tikhonov ] Implement the state machine for handling the RAID-6 parities check and repair functionality. Note that the raid6 case does not need to check for new failures, like raid5, as it will always writeback the correct disks. The raid5 case can be updated to check zero_sum_result to avoid getting confused by new failures rather than retrying the entire check operation. Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 206 ++++++++++++++++++++++++++++++--------------- 1 file changed, 139 insertions(+), 67 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 08f806379b0..3c31f7f8aa6 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2901,91 +2901,163 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, struct stripe_head_state *s, struct r6_state *r6s, int disks) { - int update_p = 0, update_q = 0; - struct r5dev *dev; int pd_idx = sh->pd_idx; int qd_idx = sh->qd_idx; - unsigned long cpu; - struct page *tmp_page; + struct r5dev *dev; set_bit(STRIPE_HANDLE, &sh->state); BUG_ON(s->failed > 2); - BUG_ON(s->uptodate < disks); + /* Want to check and possibly repair P and Q. * However there could be one 'failed' device, in which * case we can only check one of them, possibly using the * other to generate missing data */ - cpu = get_cpu(); - tmp_page = per_cpu_ptr(conf->percpu, cpu)->spare_page; - if (s->failed == r6s->q_failed) { - /* The only possible failed device holds 'Q', so it - * makes sense to check P (If anything else were failed, - * we would have used P to recreate it). - */ - compute_block_1(sh, pd_idx, 1); - if (!page_is_zero(sh->dev[pd_idx].page)) { - compute_block_1(sh, pd_idx, 0); - update_p = 1; + + switch (sh->check_state) { + case check_state_idle: + /* start a new check operation if there are < 2 failures */ + if (s->failed == r6s->q_failed) { + /* The only possible failed device holds Q, so it + * makes sense to check P (If anything else were failed, + * we would have used P to recreate it). + */ + sh->check_state = check_state_run; } - } - if (!r6s->q_failed && s->failed < 2) { - /* q is not failed, and we didn't use it to generate - * anything, so it makes sense to check it - */ - memcpy(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE); - compute_parity6(sh, UPDATE_PARITY); - if (memcmp(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE) != 0) { - clear_bit(STRIPE_INSYNC, &sh->state); - update_q = 1; + if (!r6s->q_failed && s->failed < 2) { + /* Q is not failed, and we didn't use it to generate + * anything, so it makes sense to check it + */ + if (sh->check_state == check_state_run) + sh->check_state = check_state_run_pq; + else + sh->check_state = check_state_run_q; } - } - put_cpu(); - if (update_p || update_q) { - conf->mddev->resync_mismatches += STRIPE_SECTORS; - if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) - /* don't try to repair!! */ - update_p = update_q = 0; - } + /* discard potentially stale zero_sum_result */ + sh->ops.zero_sum_result = 0; - /* now write out any block on a failed drive, - * or P or Q if they need it - */ + if (sh->check_state == check_state_run) { + /* async_xor_zero_sum destroys the contents of P */ + clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); + s->uptodate--; + } + if (sh->check_state >= check_state_run && + sh->check_state <= check_state_run_pq) { + /* async_syndrome_zero_sum preserves P and Q, so + * no need to mark them !uptodate here + */ + set_bit(STRIPE_OP_CHECK, &s->ops_request); + break; + } - if (s->failed == 2) { - dev = &sh->dev[r6s->failed_num[1]]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - if (s->failed >= 1) { - dev = &sh->dev[r6s->failed_num[0]]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } + /* we have 2-disk failure */ + BUG_ON(s->failed != 2); + /* fall through */ + case check_state_compute_result: + sh->check_state = check_state_idle; - if (update_p) { - dev = &sh->dev[pd_idx]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - if (update_q) { - dev = &sh->dev[qd_idx]; - s->locked++; - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantwrite, &dev->flags); - } - clear_bit(STRIPE_DEGRADED, &sh->state); + /* check that a write has not made the stripe insync */ + if (test_bit(STRIPE_INSYNC, &sh->state)) + break; - set_bit(STRIPE_INSYNC, &sh->state); + /* now write out any block on a failed drive, + * or P or Q if they were recomputed + */ + BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ + if (s->failed == 2) { + dev = &sh->dev[r6s->failed_num[1]]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + if (s->failed >= 1) { + dev = &sh->dev[r6s->failed_num[0]]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { + dev = &sh->dev[pd_idx]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { + dev = &sh->dev[qd_idx]; + s->locked++; + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantwrite, &dev->flags); + } + clear_bit(STRIPE_DEGRADED, &sh->state); + + set_bit(STRIPE_INSYNC, &sh->state); + break; + case check_state_run: + case check_state_run_q: + case check_state_run_pq: + break; /* we will be called again upon completion */ + case check_state_check_result: + sh->check_state = check_state_idle; + + /* handle a successful check operation, if parity is correct + * we are done. Otherwise update the mismatch count and repair + * parity if !MD_RECOVERY_CHECK + */ + if (sh->ops.zero_sum_result == 0) { + /* both parities are correct */ + if (!s->failed) + set_bit(STRIPE_INSYNC, &sh->state); + else { + /* in contrast to the raid5 case we can validate + * parity, but still have a failure to write + * back + */ + sh->check_state = check_state_compute_result; + /* Returning at this point means that we may go + * off and bring p and/or q uptodate again so + * we make sure to check zero_sum_result again + * to verify if p or q need writeback + */ + } + } else { + conf->mddev->resync_mismatches += STRIPE_SECTORS; + if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) + /* don't try to repair!! */ + set_bit(STRIPE_INSYNC, &sh->state); + else { + int *target = &sh->ops.target; + + sh->ops.target = -1; + sh->ops.target2 = -1; + sh->check_state = check_state_compute_run; + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { + set_bit(R5_Wantcompute, + &sh->dev[pd_idx].flags); + *target = pd_idx; + target = &sh->ops.target2; + s->uptodate++; + } + if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { + set_bit(R5_Wantcompute, + &sh->dev[qd_idx].flags); + *target = qd_idx; + s->uptodate++; + } + } + } + break; + case check_state_compute_run: + break; + default: + printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", + __func__, sh->check_state, + (unsigned long long) sh->sector); + BUG(); + } } static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, From 6c0069c0ae9659e3a91b68eaed06a5c6c37f45c8 Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sat, 29 Aug 2009 19:13:13 -0700 Subject: [PATCH 26/91] md/raid6: asynchronous handle_stripe6 1/ Use STRIPE_OP_BIOFILL to offload completion of read requests to raid_run_ops 2/ Implement a handler for sh->reconstruct_state similar to the raid5 case (adds handling of Q parity) 3/ Prevent handle_parity_checks6 from running concurrently with 'compute' operations 4/ Hook up raid_run_ops Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 120 +++++++++++++++++++++++++++++++-------------- 1 file changed, 82 insertions(+), 38 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 3c31f7f8aa6..a833de189ca 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3424,9 +3424,10 @@ static bool handle_stripe6(struct stripe_head *sh) mdk_rdev_t *blocked_rdev = NULL; pr_debug("handling stripe %llu, state=%#lx cnt=%d, " - "pd_idx=%d, qd_idx=%d\n", + "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, - atomic_read(&sh->count), pd_idx, qd_idx); + atomic_read(&sh->count), pd_idx, qd_idx, + sh->check_state, sh->reconstruct_state); memset(&s, 0, sizeof(s)); spin_lock(&sh->lock); @@ -3446,35 +3447,24 @@ static bool handle_stripe6(struct stripe_head *sh) pr_debug("check %d: state 0x%lx read %p write %p written %p\n", i, dev->flags, dev->toread, dev->towrite, dev->written); - /* maybe we can reply to a read */ - if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { - struct bio *rbi, *rbi2; - pr_debug("Return read for disc %d\n", i); - spin_lock_irq(&conf->device_lock); - rbi = dev->toread; - dev->toread = NULL; - if (test_and_clear_bit(R5_Overlap, &dev->flags)) - wake_up(&conf->wait_for_overlap); - spin_unlock_irq(&conf->device_lock); - while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { - copy_data(0, rbi, dev->page, dev->sector); - rbi2 = r5_next_bio(rbi, dev->sector); - spin_lock_irq(&conf->device_lock); - if (!raid5_dec_bi_phys_segments(rbi)) { - rbi->bi_next = return_bi; - return_bi = rbi; - } - spin_unlock_irq(&conf->device_lock); - rbi = rbi2; - } - } + /* maybe we can reply to a read + * + * new wantfill requests are only permitted while + * ops_complete_biofill is guaranteed to be inactive + */ + if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && + !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) + set_bit(R5_Wantfill, &dev->flags); /* now count some things */ if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; + if (test_bit(R5_Wantcompute, &dev->flags)) + BUG_ON(++s.compute > 2); - - if (dev->toread) + if (test_bit(R5_Wantfill, &dev->flags)) { + s.to_fill++; + } else if (dev->toread) s.to_read++; if (dev->towrite) { s.to_write++; @@ -3515,6 +3505,11 @@ static bool handle_stripe6(struct stripe_head *sh) blocked_rdev = NULL; } + if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { + set_bit(STRIPE_OP_BIOFILL, &s.ops_request); + set_bit(STRIPE_BIOFILL_RUN, &sh->state); + } + pr_debug("locked=%d uptodate=%d to_read=%d" " to_write=%d failed=%d failed_num=%d,%d\n", s.locked, s.uptodate, s.to_read, s.to_write, s.failed, @@ -3555,9 +3550,43 @@ static bool handle_stripe6(struct stripe_head *sh) * or to load a block that is being partially written. */ if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || - (s.syncing && (s.uptodate < disks)) || s.expanding) + (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) handle_stripe_fill6(sh, &s, &r6s, disks); + /* Now we check to see if any write operations have recently + * completed + */ + if (sh->reconstruct_state == reconstruct_state_drain_result) { + int qd_idx = sh->qd_idx; + + sh->reconstruct_state = reconstruct_state_idle; + /* All the 'written' buffers and the parity blocks are ready to + * be written back to disk + */ + BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); + BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags)); + for (i = disks; i--; ) { + dev = &sh->dev[i]; + if (test_bit(R5_LOCKED, &dev->flags) && + (i == sh->pd_idx || i == qd_idx || + dev->written)) { + pr_debug("Writing block %d\n", i); + BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); + set_bit(R5_Wantwrite, &dev->flags); + if (!test_bit(R5_Insync, &dev->flags) || + ((i == sh->pd_idx || i == qd_idx) && + s.failed == 0)) + set_bit(STRIPE_INSYNC, &sh->state); + } + } + if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { + atomic_dec(&conf->preread_active_stripes); + if (atomic_read(&conf->preread_active_stripes) < + IO_THRESHOLD) + md_wakeup_thread(conf->mddev->thread); + } + } + /* Now to consider new write requests and what else, if anything * should be read. We do not handle new writes when: * 1/ A 'write' operation (copy+gen_syndrome) is already in flight. @@ -3569,9 +3598,13 @@ static bool handle_stripe6(struct stripe_head *sh) /* maybe we need to check and possibly fix the parity for this stripe * Any reads will already have been scheduled, so we just see if enough - * data is available + * data is available. The parity check is held off while parity + * dependent operations are in flight. */ - if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) + if (sh->check_state || + (s.syncing && s.locked == 0 && + !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && + !test_bit(STRIPE_INSYNC, &sh->state))) handle_parity_checks6(conf, sh, &s, &r6s, disks); if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { @@ -3593,15 +3626,29 @@ static bool handle_stripe6(struct stripe_head *sh) set_bit(R5_Wantwrite, &dev->flags); set_bit(R5_ReWrite, &dev->flags); set_bit(R5_LOCKED, &dev->flags); + s.locked++; } else { /* let's read it back */ set_bit(R5_Wantread, &dev->flags); set_bit(R5_LOCKED, &dev->flags); + s.locked++; } } } - if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { + /* Finish reconstruct operations initiated by the expansion process */ + if (sh->reconstruct_state == reconstruct_state_result) { + sh->reconstruct_state = reconstruct_state_idle; + clear_bit(STRIPE_EXPANDING, &sh->state); + for (i = conf->raid_disks; i--; ) { + set_bit(R5_Wantwrite, &sh->dev[i].flags); + set_bit(R5_LOCKED, &sh->dev[i].flags); + s.locked++; + } + } + + if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && + !sh->reconstruct_state) { struct stripe_head *sh2 = get_active_stripe(conf, sh->sector, 1, 1); if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { @@ -3622,14 +3669,8 @@ static bool handle_stripe6(struct stripe_head *sh) /* Need to write out all blocks after computing P&Q */ sh->disks = conf->raid_disks; stripe_set_idx(sh->sector, conf, 0, sh); - compute_parity6(sh, RECONSTRUCT_WRITE); - for (i = conf->raid_disks ; i-- ; ) { - set_bit(R5_LOCKED, &sh->dev[i].flags); - s.locked++; - set_bit(R5_Wantwrite, &sh->dev[i].flags); - } - clear_bit(STRIPE_EXPANDING, &sh->state); - } else if (s.expanded) { + schedule_reconstruction(sh, &s, 1, 1); + } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { clear_bit(STRIPE_EXPAND_READY, &sh->state); atomic_dec(&conf->reshape_stripes); wake_up(&conf->wait_for_overlap); @@ -3647,6 +3688,9 @@ static bool handle_stripe6(struct stripe_head *sh) if (unlikely(blocked_rdev)) md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); + if (s.ops_request) + raid_run_ops(sh, s.ops_request); + ops_run_io(sh, &s); return_io(return_bi); From b774ef491b4edf6876077014ecbb87f10c69c10f Mon Sep 17 00:00:00 2001 From: Yuri Tikhonov Date: Sat, 29 Aug 2009 19:13:13 -0700 Subject: [PATCH 27/91] md/raid6: remove synchronous infrastructure These routines have been replaced by there asynchronous counterparts. Signed-off-by: Yuri Tikhonov Signed-off-by: Ilya Yanok Signed-off-by: Dan Williams --- drivers/md/raid5.c | 254 --------------------------------------------- 1 file changed, 254 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index a833de189ca..7c22e19aca8 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -1927,253 +1927,6 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) } - -/* - * Copy data between a page in the stripe cache, and one or more bion - * The page could align with the middle of the bio, or there could be - * several bion, each with several bio_vecs, which cover part of the page - * Multiple bion are linked together on bi_next. There may be extras - * at the end of this list. We ignore them. - */ -static void copy_data(int frombio, struct bio *bio, - struct page *page, - sector_t sector) -{ - char *pa = page_address(page); - struct bio_vec *bvl; - int i; - int page_offset; - - if (bio->bi_sector >= sector) - page_offset = (signed)(bio->bi_sector - sector) * 512; - else - page_offset = (signed)(sector - bio->bi_sector) * -512; - bio_for_each_segment(bvl, bio, i) { - int len = bio_iovec_idx(bio,i)->bv_len; - int clen; - int b_offset = 0; - - if (page_offset < 0) { - b_offset = -page_offset; - page_offset += b_offset; - len -= b_offset; - } - - if (len > 0 && page_offset + len > STRIPE_SIZE) - clen = STRIPE_SIZE - page_offset; - else clen = len; - - if (clen > 0) { - char *ba = __bio_kmap_atomic(bio, i, KM_USER0); - if (frombio) - memcpy(pa+page_offset, ba+b_offset, clen); - else - memcpy(ba+b_offset, pa+page_offset, clen); - __bio_kunmap_atomic(ba, KM_USER0); - } - if (clen < len) /* hit end of page */ - break; - page_offset += len; - } -} - -#define check_xor() do { \ - if (count == MAX_XOR_BLOCKS) { \ - xor_blocks(count, STRIPE_SIZE, dest, ptr);\ - count = 0; \ - } \ - } while(0) - -static void compute_parity6(struct stripe_head *sh, int method) -{ - raid5_conf_t *conf = sh->raid_conf; - int i, pd_idx, qd_idx, d0_idx, disks = sh->disks, count; - int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); - struct bio *chosen; - /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[syndrome_disks+2]; - - pd_idx = sh->pd_idx; - qd_idx = sh->qd_idx; - d0_idx = raid6_d0(sh); - - pr_debug("compute_parity, stripe %llu, method %d\n", - (unsigned long long)sh->sector, method); - - switch(method) { - case READ_MODIFY_WRITE: - BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ - case RECONSTRUCT_WRITE: - for (i= disks; i-- ;) - if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { - chosen = sh->dev[i].towrite; - sh->dev[i].towrite = NULL; - - if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) - wake_up(&conf->wait_for_overlap); - - BUG_ON(sh->dev[i].written); - sh->dev[i].written = chosen; - } - break; - case CHECK_PARITY: - BUG(); /* Not implemented yet */ - } - - for (i = disks; i--;) - if (sh->dev[i].written) { - sector_t sector = sh->dev[i].sector; - struct bio *wbi = sh->dev[i].written; - while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { - copy_data(1, wbi, sh->dev[i].page, sector); - wbi = r5_next_bio(wbi, sector); - } - - set_bit(R5_LOCKED, &sh->dev[i].flags); - set_bit(R5_UPTODATE, &sh->dev[i].flags); - } - - /* Note that unlike RAID-5, the ordering of the disks matters greatly.*/ - - for (i = 0; i < disks; i++) - ptrs[i] = (void *)raid6_empty_zero_page; - - count = 0; - i = d0_idx; - do { - int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); - - ptrs[slot] = page_address(sh->dev[i].page); - if (slot < syndrome_disks && - !test_bit(R5_UPTODATE, &sh->dev[i].flags)) { - printk(KERN_ERR "block %d/%d not uptodate " - "on parity calc\n", i, count); - BUG(); - } - - i = raid6_next_disk(i, disks); - } while (i != d0_idx); - BUG_ON(count != syndrome_disks); - - raid6_call.gen_syndrome(syndrome_disks+2, STRIPE_SIZE, ptrs); - - switch(method) { - case RECONSTRUCT_WRITE: - set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); - set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); - set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); - set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); - break; - case UPDATE_PARITY: - set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); - set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); - break; - } -} - - -/* Compute one missing block */ -static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) -{ - int i, count, disks = sh->disks; - void *ptr[MAX_XOR_BLOCKS], *dest, *p; - int qd_idx = sh->qd_idx; - - pr_debug("compute_block_1, stripe %llu, idx %d\n", - (unsigned long long)sh->sector, dd_idx); - - if ( dd_idx == qd_idx ) { - /* We're actually computing the Q drive */ - compute_parity6(sh, UPDATE_PARITY); - } else { - dest = page_address(sh->dev[dd_idx].page); - if (!nozero) memset(dest, 0, STRIPE_SIZE); - count = 0; - for (i = disks ; i--; ) { - if (i == dd_idx || i == qd_idx) - continue; - p = page_address(sh->dev[i].page); - if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) - ptr[count++] = p; - else - printk("compute_block() %d, stripe %llu, %d" - " not present\n", dd_idx, - (unsigned long long)sh->sector, i); - - check_xor(); - } - if (count) - xor_blocks(count, STRIPE_SIZE, dest, ptr); - if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); - else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); - } -} - -/* Compute two missing blocks */ -static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) -{ - int i, count, disks = sh->disks; - int syndrome_disks = sh->ddf_layout ? disks : disks-2; - int d0_idx = raid6_d0(sh); - int faila = -1, failb = -1; - /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[syndrome_disks+2]; - - for (i = 0; i < disks ; i++) - ptrs[i] = (void *)raid6_empty_zero_page; - count = 0; - i = d0_idx; - do { - int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); - - ptrs[slot] = page_address(sh->dev[i].page); - - if (i == dd_idx1) - faila = slot; - if (i == dd_idx2) - failb = slot; - i = raid6_next_disk(i, disks); - } while (i != d0_idx); - BUG_ON(count != syndrome_disks); - - BUG_ON(faila == failb); - if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } - - pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", - (unsigned long long)sh->sector, dd_idx1, dd_idx2, - faila, failb); - - if (failb == syndrome_disks+1) { - /* Q disk is one of the missing disks */ - if (faila == syndrome_disks) { - /* Missing P+Q, just recompute */ - compute_parity6(sh, UPDATE_PARITY); - return; - } else { - /* We're missing D+Q; recompute D from P */ - compute_block_1(sh, ((dd_idx1 == sh->qd_idx) ? - dd_idx2 : dd_idx1), - 0); - compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ - return; - } - } - - /* We're missing D+P or D+D; */ - if (failb == syndrome_disks) { - /* We're missing D+P. */ - raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, faila, ptrs); - } else { - /* We're missing D+D. */ - raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, faila, failb, - ptrs); - } - - /* Both the above update both missing blocks */ - set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); - set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); -} - static void schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, int rcw, int expand) @@ -2331,13 +2084,6 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in static void end_reshape(raid5_conf_t *conf); -static int page_is_zero(struct page *p) -{ - char *a = page_address(p); - return ((*(u32*)a) == 0 && - memcmp(a, a+4, STRIPE_SIZE-4)==0); -} - static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, struct stripe_head *sh) { From 07a3b417dc3d00802bd7b4874c3e811f0b015a7d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 29 Aug 2009 19:13:13 -0700 Subject: [PATCH 28/91] md/raid456: distribute raid processing over multiple cores Now that the resources to handle stripe_head operations are allocated percpu it is possible for raid5d to distribute stripe handling over multiple cores. This conversion also adds a call to cond_resched() in the non-multicore case to prevent one core from getting monopolized for raid operations. Cc: Arjan van de Ven Signed-off-by: Dan Williams --- drivers/md/Kconfig | 11 +++++++++++ drivers/md/raid5.c | 36 ++++++++++++++++++++++++++++++++++-- 2 files changed, 45 insertions(+), 2 deletions(-) diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index abb8636bfde..09c0c6e49ab 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -154,6 +154,17 @@ config MD_RAID456 If unsure, say Y. +config MULTICORE_RAID456 + bool "RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)" + depends on MD_RAID456 + depends on SMP + depends on EXPERIMENTAL + ---help--- + Enable the raid456 module to dispatch per-stripe raid operations to a + thread pool. + + If unsure, say N. + config MD_RAID6_PQ tristate diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 7c22e19aca8..364ea37706f 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -47,6 +47,7 @@ #include #include #include +#include #include #include #include "md.h" @@ -4314,6 +4315,36 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) return handled; } +#ifdef CONFIG_MULTICORE_RAID456 +static void __process_stripe(void *param, async_cookie_t cookie) +{ + struct stripe_head *sh = param; + + handle_stripe(sh); + release_stripe(sh); +} + +static void process_stripe(struct stripe_head *sh, struct list_head *domain) +{ + async_schedule_domain(__process_stripe, sh, domain); +} + +static void synchronize_stripe_processing(struct list_head *domain) +{ + async_synchronize_full_domain(domain); +} +#else +static void process_stripe(struct stripe_head *sh, struct list_head *domain) +{ + handle_stripe(sh); + release_stripe(sh); + cond_resched(); +} + +static void synchronize_stripe_processing(struct list_head *domain) +{ +} +#endif /* @@ -4328,6 +4359,7 @@ static void raid5d(mddev_t *mddev) struct stripe_head *sh; raid5_conf_t *conf = mddev_to_conf(mddev); int handled; + LIST_HEAD(raid_domain); pr_debug("+++ raid5d active\n"); @@ -4364,8 +4396,7 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); handled++; - handle_stripe(sh); - release_stripe(sh); + process_stripe(sh, &raid_domain); spin_lock_irq(&conf->device_lock); } @@ -4373,6 +4404,7 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); + synchronize_stripe_processing(&raid_domain); async_tx_issue_pending_all(); unplug_slaves(mddev); From 1f27adc2f050836c12deb4d99afe507636537a0b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:29:02 -0700 Subject: [PATCH 29/91] ioat: move definitions to dma.h Some of these defines may be useful outside of dma.c and the header is private so there are no namespace pollution concerns. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 14 -------------- drivers/dma/ioat/dma.h | 16 ++++++++++++++++ 2 files changed, 16 insertions(+), 14 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 648797e8329..16c080786a6 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -38,28 +38,14 @@ #include "registers.h" #include "hw.h" -#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) -#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) -#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) -#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) - -#define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) static int ioat_pending_level = 4; module_param(ioat_pending_level, int, 0644); MODULE_PARM_DESC(ioat_pending_level, "high-water mark for pushing ioat descriptors (default: 4)"); -#define RESET_DELAY msecs_to_jiffies(100) -#define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000)) static void ioat_dma_chan_reset_part2(struct work_struct *work); static void ioat_dma_chan_watchdog(struct work_struct *work); -/* - * workaround for IOAT ver.3.0 null descriptor issue - * (channel returns error when size is 0) - */ -#define NULL_DESC_BUFFER_SIZE 1 - /* internal functions */ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan); static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan); diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index e80e787fe64..ccb400f5e27 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -43,6 +43,22 @@ enum ioat_interrupt { #define IOAT_DMA_DCA_ANY_CPU ~0 #define IOAT_WATCHDOG_PERIOD (2 * HZ) +#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) +#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) +#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) +#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) + +#define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) + +#define RESET_DELAY msecs_to_jiffies(100) +#define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000)) + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + /** * struct ioatdma_device - internal representation of a IOAT device From e6c0b69a43150c1a37cf342ce5faedf12583bf79 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:29:44 -0700 Subject: [PATCH 30/91] ioat: convert ioat_probe to pcim/devm The driver currently duplicates much of what these routines offer, so just use the common code. For example ->irq_mode tracks what interrupt mode was initialized, which duplicates the ->msix_enabled and ->msi_enabled handling in pcim_release. This also adds a check to the return value of dma_async_device_register, which can fail. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 130 ++++++++++++++--------------------------- drivers/dma/ioat/dma.h | 11 ---- drivers/dma/ioat/hw.h | 1 + drivers/dma/ioat/pci.c | 65 ++++++++------------- 4 files changed, 67 insertions(+), 140 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 16c080786a6..65f8b7492a4 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -121,6 +121,7 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) u32 xfercap; int i; struct ioat_dma_chan *ioat_chan; + struct device *dev = &device->pdev->dev; /* * IOAT ver.3 workarounds @@ -164,7 +165,7 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) } #endif for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL); + ioat_chan = devm_kzalloc(dev, sizeof(*ioat_chan), GFP_KERNEL); if (!ioat_chan) { device->common.chancnt = i; break; @@ -1450,7 +1451,11 @@ MODULE_PARM_DESC(ioat_interrupt_style, static int ioat_dma_setup_interrupts(struct ioatdma_device *device) { struct ioat_dma_chan *ioat_chan; - int err, i, j, msixcnt; + struct pci_dev *pdev = device->pdev; + struct device *dev = &pdev->dev; + struct msix_entry *msix; + int i, j, msixcnt; + int err = -EINVAL; u8 intrctrl = 0; if (!strcmp(ioat_interrupt_style, "msix")) @@ -1461,8 +1466,7 @@ static int ioat_dma_setup_interrupts(struct ioatdma_device *device) goto msi; if (!strcmp(ioat_interrupt_style, "intx")) goto intx; - dev_err(&device->pdev->dev, "invalid ioat_interrupt_style %s\n", - ioat_interrupt_style); + dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style); goto err_no_irq; msix: @@ -1471,55 +1475,55 @@ msix: for (i = 0; i < msixcnt; i++) device->msix_entries[i].entry = i; - err = pci_enable_msix(device->pdev, device->msix_entries, msixcnt); + err = pci_enable_msix(pdev, device->msix_entries, msixcnt); if (err < 0) goto msi; if (err > 0) goto msix_single_vector; for (i = 0; i < msixcnt; i++) { + msix = &device->msix_entries[i]; ioat_chan = ioat_lookup_chan_by_index(device, i); - err = request_irq(device->msix_entries[i].vector, - ioat_dma_do_interrupt_msix, - 0, "ioat-msix", ioat_chan); + err = devm_request_irq(dev, msix->vector, + ioat_dma_do_interrupt_msix, 0, + "ioat-msix", ioat_chan); if (err) { for (j = 0; j < i; j++) { + msix = &device->msix_entries[j]; ioat_chan = ioat_lookup_chan_by_index(device, j); - free_irq(device->msix_entries[j].vector, - ioat_chan); + devm_free_irq(dev, msix->vector, ioat_chan); } goto msix_single_vector; } } intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; - device->irq_mode = msix_multi_vector; goto done; msix_single_vector: - device->msix_entries[0].entry = 0; - err = pci_enable_msix(device->pdev, device->msix_entries, 1); + msix = &device->msix_entries[0]; + msix->entry = 0; + err = pci_enable_msix(pdev, device->msix_entries, 1); if (err) goto msi; - err = request_irq(device->msix_entries[0].vector, ioat_dma_do_interrupt, - 0, "ioat-msix", device); + err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt, 0, + "ioat-msix", device); if (err) { - pci_disable_msix(device->pdev); + pci_disable_msix(pdev); goto msi; } - device->irq_mode = msix_single_vector; goto done; msi: - err = pci_enable_msi(device->pdev); + err = pci_enable_msi(pdev); if (err) goto intx; - err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, - 0, "ioat-msi", device); + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0, + "ioat-msi", device); if (err) { - pci_disable_msi(device->pdev); + pci_disable_msi(pdev); goto intx; } /* @@ -1527,21 +1531,17 @@ msi: */ if (device->version == IOAT_VER_1_2) { u32 dmactrl; - pci_read_config_dword(device->pdev, - IOAT_PCI_DMACTRL_OFFSET, &dmactrl); + pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; - pci_write_config_dword(device->pdev, - IOAT_PCI_DMACTRL_OFFSET, dmactrl); + pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); } - device->irq_mode = msi; goto done; intx: - err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, - IRQF_SHARED, "ioat-intx", device); + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, + IRQF_SHARED, "ioat-intx", device); if (err) goto err_no_irq; - device->irq_mode = intx; done: intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; @@ -1551,60 +1551,26 @@ done: err_no_irq: /* Disable all interrupt generation */ writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); - dev_err(&device->pdev->dev, "no usable interrupts\n"); - device->irq_mode = none; - return -1; + dev_err(dev, "no usable interrupts\n"); + return err; } -/** - * ioat_dma_remove_interrupts - remove whatever interrupts were set - * @device: ioat device - */ -static void ioat_dma_remove_interrupts(struct ioatdma_device *device) +static void ioat_disable_interrupts(struct ioatdma_device *device) { - struct ioat_dma_chan *ioat_chan; - int i; - /* Disable all interrupt generation */ writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); - - switch (device->irq_mode) { - case msix_multi_vector: - for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = ioat_lookup_chan_by_index(device, i); - free_irq(device->msix_entries[i].vector, ioat_chan); - } - pci_disable_msix(device->pdev); - break; - case msix_single_vector: - free_irq(device->msix_entries[0].vector, device); - pci_disable_msix(device->pdev); - break; - case msi: - free_irq(device->pdev->irq, device); - pci_disable_msi(device->pdev); - break; - case intx: - free_irq(device->pdev->irq, device); - break; - case none: - dev_warn(&device->pdev->dev, - "call to %s without interrupts setup\n", __func__); - } - device->irq_mode = none; } struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase) { int err; + struct device *dev = &pdev->dev; struct ioatdma_device *device; - device = kzalloc(sizeof(*device), GFP_KERNEL); - if (!device) { + device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL); + if (!device) err = -ENOMEM; - goto err_kzalloc; - } device->pdev = pdev; device->reg_base = iobase; device->version = readb(device->reg_base + IOAT_VER_OFFSET); @@ -1651,14 +1617,12 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, break; } - dev_err(&device->pdev->dev, - "Intel(R) I/OAT DMA Engine found," + dev_err(dev, "Intel(R) I/OAT DMA Engine found," " %d channels, device version 0x%02x, driver version %s\n", device->common.chancnt, device->version, IOAT_DMA_VERSION); if (!device->common.chancnt) { - dev_err(&device->pdev->dev, - "Intel(R) I/OAT DMA Engine problem found: " + dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: " "zero channels detected\n"); goto err_setup_interrupts; } @@ -1671,9 +1635,11 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, if (err) goto err_self_test; - ioat_set_tcp_copy_break(device); + err = dma_async_device_register(&device->common); + if (err) + goto err_self_test; - dma_async_device_register(&device->common); + ioat_set_tcp_copy_break(device); if (device->version != IOAT_VER_3_0) { INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); @@ -1684,16 +1650,12 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, return device; err_self_test: - ioat_dma_remove_interrupts(device); + ioat_disable_interrupts(device); err_setup_interrupts: pci_pool_destroy(device->completion_pool); err_completion_pool: pci_pool_destroy(device->dma_pool); err_dma_pool: - kfree(device); -err_kzalloc: - dev_err(&pdev->dev, - "Intel(R) I/OAT DMA Engine initialization failed\n"); return NULL; } @@ -1705,23 +1667,17 @@ void ioat_dma_remove(struct ioatdma_device *device) if (device->version != IOAT_VER_3_0) cancel_delayed_work(&device->work); - ioat_dma_remove_interrupts(device); + ioat_disable_interrupts(device); dma_async_device_unregister(&device->common); pci_pool_destroy(device->dma_pool); pci_pool_destroy(device->completion_pool); - iounmap(device->reg_base); - pci_release_regions(device->pdev); - pci_disable_device(device->pdev); - list_for_each_entry_safe(chan, _chan, &device->common.channels, device_node) { ioat_chan = to_ioat_chan(chan); list_del(&chan->device_node); - kfree(ioat_chan); } - kfree(device); } diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index ccb400f5e27..5e8d7cfabc2 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -31,14 +31,6 @@ #define IOAT_DMA_VERSION "3.64" -enum ioat_interrupt { - none = 0, - msix_multi_vector = 1, - msix_single_vector = 2, - msi = 3, - intx = 4, -}; - #define IOAT_LOW_COMPLETION_MASK 0xffffffc0 #define IOAT_DMA_DCA_ANY_CPU ~0 #define IOAT_WATCHDOG_PERIOD (2 * HZ) @@ -59,7 +51,6 @@ enum ioat_interrupt { */ #define NULL_DESC_BUFFER_SIZE 1 - /** * struct ioatdma_device - internal representation of a IOAT device * @pdev: PCI-Express device @@ -67,7 +58,6 @@ enum ioat_interrupt { * @dma_pool: for allocating DMA descriptors * @common: embedded struct dma_device * @version: version of ioatdma device - * @irq_mode: which style irq to use * @msix_entries: irq handlers * @idx: per channel data */ @@ -79,7 +69,6 @@ struct ioatdma_device { struct pci_pool *completion_pool; struct dma_device common; u8 version; - enum ioat_interrupt irq_mode; struct delayed_work work; struct msix_entry msix_entries[4]; struct ioat_dma_chan *idx[4]; diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h index afa57eef86c..1438fa5c4d1 100644 --- a/drivers/dma/ioat/hw.h +++ b/drivers/dma/ioat/hw.h @@ -23,6 +23,7 @@ /* PCI Configuration Space Values */ #define IOAT_PCI_VID 0x8086 +#define IOAT_MMIO_BAR 0 /* CB device ID's */ #define IOAT_PCI_DID_5000 0x1A38 diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index d7948bfd8fb..982e38fd177 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -62,7 +62,6 @@ static struct pci_device_id ioat_pci_tbl[] = { struct ioat_device { struct pci_dev *pdev; - void __iomem *iobase; struct ioatdma_device *dma; struct dca_provider *dca; }; @@ -75,8 +74,10 @@ static int ioat_dca_enabled = 1; module_param(ioat_dca_enabled, int, 0644); MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); +#define DRV_NAME "ioatdma" + static struct pci_driver ioat_pci_driver = { - .name = "ioatdma", + .name = DRV_NAME, .id_table = ioat_pci_tbl, .probe = ioat_probe, .remove = __devexit_p(ioat_remove), @@ -85,47 +86,42 @@ static struct pci_driver ioat_pci_driver = { static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *id) { + void __iomem * const *iomap; void __iomem *iobase; + struct device *dev = &pdev->dev; struct ioat_device *device; - unsigned long mmio_start, mmio_len; int err; - err = pci_enable_device(pdev); + err = pcim_enable_device(pdev); if (err) - goto err_enable_device; + return err; - err = pci_request_regions(pdev, ioat_pci_driver.name); + err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME); if (err) - goto err_request_regions; + return err; + iomap = pcim_iomap_table(pdev); + if (!iomap) + return -ENOMEM; err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); if (err) err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); if (err) - goto err_set_dma_mask; + return err; err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); if (err) err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); if (err) - goto err_set_dma_mask; + return err; - mmio_start = pci_resource_start(pdev, 0); - mmio_len = pci_resource_len(pdev, 0); - iobase = ioremap(mmio_start, mmio_len); - if (!iobase) { - err = -ENOMEM; - goto err_ioremap; - } + device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL); + if (!device) + return -ENOMEM; - device = kzalloc(sizeof(*device), GFP_KERNEL); - if (!device) { - err = -ENOMEM; - goto err_kzalloc; - } device->pdev = pdev; pci_set_drvdata(pdev, device); - device->iobase = iobase; + iobase = iomap[IOAT_MMIO_BAR]; pci_set_master(pdev); @@ -146,28 +142,15 @@ static int __devinit ioat_probe(struct pci_dev *pdev, device->dca = ioat3_dca_init(pdev, iobase); break; default: - err = -ENODEV; - break; + return -ENODEV; } - if (!device->dma) - err = -ENODEV; - if (err) - goto err_version; + if (!device->dma) { + dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); + return -ENODEV; + } return 0; - -err_version: - kfree(device); -err_kzalloc: - iounmap(iobase); -err_ioremap: -err_set_dma_mask: - pci_release_regions(pdev); - pci_disable_device(pdev); -err_request_regions: -err_enable_device: - return err; } static void __devexit ioat_remove(struct pci_dev *pdev) @@ -185,8 +168,6 @@ static void __devexit ioat_remove(struct pci_dev *pdev) ioat_dma_remove(device->dma); device->dma = NULL; } - - kfree(device); } static int __init ioat_init_module(void) From bc3c70258526a635325f1f15138a96297879bc1a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:33:42 -0700 Subject: [PATCH 31/91] ioat: cleanup some long deref chains and 80 column collisions * reduce device->common. to dma-> in ioat_dma_{probe,remove,selftest} * ioat_lookup_chan_by_index to ioat_chan_by_index * multi-line function definitions * ioat_desc_sw.async_tx to ioat_desc_sw.txd * desc->txd. to tx-> in cleanup routine Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 304 +++++++++++++++++++---------------------- drivers/dma/ioat/dma.h | 7 +- 2 files changed, 144 insertions(+), 167 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 65f8b7492a4..462dae62719 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -55,9 +55,8 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); static struct ioat_desc_sw * ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); -static inline struct ioat_dma_chan *ioat_lookup_chan_by_index( - struct ioatdma_device *device, - int index) +static inline struct ioat_dma_chan * +ioat_chan_by_index(struct ioatdma_device *device, int index) { return device->idx[index]; } @@ -87,7 +86,7 @@ static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); for_each_bit(bit, &attnstatus, BITS_PER_LONG) { - ioat_chan = ioat_lookup_chan_by_index(instance, bit); + ioat_chan = ioat_chan_by_index(instance, bit); tasklet_schedule(&ioat_chan->cleanup_task); } @@ -205,8 +204,8 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) * descriptors to hw * @chan: DMA channel handle */ -static inline void __ioat1_dma_memcpy_issue_pending( - struct ioat_dma_chan *ioat_chan) +static inline void +__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat_chan) { ioat_chan->pending = 0; writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET); @@ -223,8 +222,8 @@ static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) } } -static inline void __ioat2_dma_memcpy_issue_pending( - struct ioat_dma_chan *ioat_chan) +static inline void +__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat_chan) { ioat_chan->pending = 0; writew(ioat_chan->dmacount, @@ -279,18 +278,18 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) desc = to_ioat_desc(ioat_chan->used_desc.prev); switch (ioat_chan->device->version) { case IOAT_VER_1_2: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, + writel(((u64) desc->txd.phys) >> 32, ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); writeb(IOAT_CHANCMD_START, ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); break; case IOAT_VER_2_0: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, + writel(((u64) desc->txd.phys) >> 32, ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); /* tell the engine to go with what's left to be done */ @@ -299,7 +298,7 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) break; } - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "chan%d reset - %d descs waiting, %d total desc\n", chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); @@ -322,7 +321,7 @@ static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat_chan) chansts = (ioat_chan->completion_virt->low & IOAT_CHANSTS_DMA_TRANSFER_STATUS); if (chanerr) { - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", chan_num(ioat_chan), chansts, chanerr); writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); @@ -367,7 +366,7 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) unsigned long compl_desc_addr_hw; for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = ioat_lookup_chan_by_index(device, i); + ioat_chan = ioat_chan_by_index(device, i); if (ioat_chan->device->version == IOAT_VER_1_2 /* have we started processing anything yet */ @@ -475,7 +474,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) len = first->len; src = first->src; dst = first->dst; - orig_flags = first->async_tx.flags; + orig_flags = first->txd.flags; new = first; spin_lock_bh(&ioat_chan->desc_lock); @@ -484,7 +483,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) do { copy = min_t(size_t, len, ioat_chan->xfercap); - async_tx_ack(&new->async_tx); + async_tx_ack(&new->txd); hw = new->hw; hw->size = copy; @@ -495,7 +494,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) /* chain together the physical address list for the HW */ wmb(); - prev->hw->next = (u64) new->async_tx.phys; + prev->hw->next = (u64) new->txd.phys; len -= copy; dst += copy; @@ -507,27 +506,26 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) } while (len && (new = ioat1_dma_get_next_descriptor(ioat_chan))); if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "tx submit failed\n"); + dev_err(to_dev(ioat_chan), "tx submit failed\n"); spin_unlock_bh(&ioat_chan->desc_lock); return -ENOMEM; } hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; - if (first->async_tx.callback) { + if (first->txd.callback) { hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; if (first != new) { /* move callback into to last desc */ - new->async_tx.callback = first->async_tx.callback; - new->async_tx.callback_param - = first->async_tx.callback_param; - first->async_tx.callback = NULL; - first->async_tx.callback_param = NULL; + new->txd.callback = first->txd.callback; + new->txd.callback_param + = first->txd.callback_param; + first->txd.callback = NULL; + first->txd.callback_param = NULL; } } new->tx_cnt = desc_count; - new->async_tx.flags = orig_flags; /* client is in control of this ack */ + new->txd.flags = orig_flags; /* client is in control of this ack */ /* store the original values for use in later cleanup */ if (new != first) { @@ -541,11 +539,11 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) cookie++; if (cookie < 0) cookie = 1; - ioat_chan->common.cookie = new->async_tx.cookie = cookie; + ioat_chan->common.cookie = new->txd.cookie = cookie; /* write address into NextDescriptor field of last desc in chain */ to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = - first->async_tx.phys; + first->txd.phys; list_splice_tail(&new_chain, &ioat_chan->used_desc); ioat_chan->dmacount += desc_count; @@ -574,7 +572,7 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) len = first->len; src = first->src; dst = first->dst; - orig_flags = first->async_tx.flags; + orig_flags = first->txd.flags; new = first; /* @@ -584,7 +582,7 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) do { copy = min_t(size_t, len, ioat_chan->xfercap); - async_tx_ack(&new->async_tx); + async_tx_ack(&new->txd); hw = new->hw; hw->size = copy; @@ -599,27 +597,26 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) } while (len && (new = ioat2_dma_get_next_descriptor(ioat_chan))); if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "tx submit failed\n"); + dev_err(to_dev(ioat_chan), "tx submit failed\n"); spin_unlock_bh(&ioat_chan->desc_lock); return -ENOMEM; } hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_CP_STS; - if (first->async_tx.callback) { + if (first->txd.callback) { hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; if (first != new) { /* move callback into to last desc */ - new->async_tx.callback = first->async_tx.callback; - new->async_tx.callback_param - = first->async_tx.callback_param; - first->async_tx.callback = NULL; - first->async_tx.callback_param = NULL; + new->txd.callback = first->txd.callback; + new->txd.callback_param + = first->txd.callback_param; + first->txd.callback = NULL; + first->txd.callback_param = NULL; } } new->tx_cnt = desc_count; - new->async_tx.flags = orig_flags; /* client is in control of this ack */ + new->txd.flags = orig_flags; /* client is in control of this ack */ /* store the original values for use in later cleanup */ if (new != first) { @@ -633,7 +630,7 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) cookie++; if (cookie < 0) cookie = 1; - ioat_chan->common.cookie = new->async_tx.cookie = cookie; + ioat_chan->common.cookie = new->txd.cookie = cookie; ioat_chan->dmacount += desc_count; ioat_chan->pending += desc_count; @@ -649,9 +646,8 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) * @ioat_chan: the channel supplying the memory pool for the descriptors * @flags: allocation flags */ -static struct ioat_desc_sw *ioat_dma_alloc_descriptor( - struct ioat_dma_chan *ioat_chan, - gfp_t flags) +static struct ioat_desc_sw * +ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat_chan, gfp_t flags) { struct ioat_dma_descriptor *desc; struct ioat_desc_sw *desc_sw; @@ -670,19 +666,19 @@ static struct ioat_desc_sw *ioat_dma_alloc_descriptor( } memset(desc, 0, sizeof(*desc)); - dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common); + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat_chan->common); switch (ioat_chan->device->version) { case IOAT_VER_1_2: - desc_sw->async_tx.tx_submit = ioat1_tx_submit; + desc_sw->txd.tx_submit = ioat1_tx_submit; break; case IOAT_VER_2_0: case IOAT_VER_3_0: - desc_sw->async_tx.tx_submit = ioat2_tx_submit; + desc_sw->txd.tx_submit = ioat2_tx_submit; break; } desc_sw->hw = desc; - desc_sw->async_tx.phys = phys; + desc_sw->txd.phys = phys; return desc_sw; } @@ -712,9 +708,9 @@ static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan) /* circle link the hw descriptors */ desc = to_ioat_desc(ioat_chan->free_desc.next); - desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; + desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; list_for_each_entry_safe(desc, _desc, ioat_chan->free_desc.next, node) { - desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; + desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; } } @@ -743,8 +739,7 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); if (chanerr) { - dev_err(&ioat_chan->device->pdev->dev, - "CHANERR = %x, clearing\n", chanerr); + dev_err(to_dev(ioat_chan), "CHANERR = %x, clearing\n", chanerr); writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); } @@ -752,7 +747,7 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) for (i = 0; i < ioat_initial_desc_count; i++) { desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "Only %d initial descriptors\n", i); break; } @@ -819,14 +814,14 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) in_use_descs++; list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); + desc->txd.phys); kfree(desc); } list_for_each_entry_safe(desc, _desc, &ioat_chan->free_desc, node) { list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); + desc->txd.phys); kfree(desc); } break; @@ -836,12 +831,12 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) ioat_chan->free_desc.next, node) { list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); + desc->txd.phys); kfree(desc); } desc = to_ioat_desc(ioat_chan->free_desc.next); pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); + desc->txd.phys); kfree(desc); INIT_LIST_HEAD(&ioat_chan->free_desc); INIT_LIST_HEAD(&ioat_chan->used_desc); @@ -855,8 +850,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) /* one is ok since we left it on there on purpose */ if (in_use_descs > 1) - dev_err(&ioat_chan->device->pdev->dev, - "Freeing %d in use descriptors!\n", + dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n", in_use_descs - 1); ioat_chan->last_completion = ioat_chan->completion_addr = 0; @@ -889,8 +883,7 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) /* try to get another desc */ new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "alloc failed\n"); + dev_err(to_dev(ioat_chan), "alloc failed\n"); return NULL; } } @@ -936,16 +929,15 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) for (i = 16; i; i--) { desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, - "alloc failed\n"); + dev_err(to_dev(ioat_chan), "alloc failed\n"); break; } list_add_tail(&desc->node, ioat_chan->used_desc.next); desc->hw->next - = to_ioat_desc(desc->node.next)->async_tx.phys; + = to_ioat_desc(desc->node.next)->txd.phys; to_ioat_desc(desc->node.prev)->hw->next - = desc->async_tx.phys; + = desc->txd.phys; ioat_chan->desccount++; } @@ -962,8 +954,8 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) return new; } -static struct ioat_desc_sw *ioat_dma_get_next_descriptor( - struct ioat_dma_chan *ioat_chan) +static struct ioat_desc_sw * +ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) { if (!ioat_chan) return NULL; @@ -978,12 +970,9 @@ static struct ioat_desc_sw *ioat_dma_get_next_descriptor( return NULL; } -static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy( - struct dma_chan *chan, - dma_addr_t dma_dest, - dma_addr_t dma_src, - size_t len, - unsigned long flags) +static struct dma_async_tx_descriptor * +ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) { struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); struct ioat_desc_sw *new; @@ -996,22 +985,19 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy( new->len = len; new->dst = dma_dest; new->src = dma_src; - new->async_tx.flags = flags; - return &new->async_tx; + new->txd.flags = flags; + return &new->txd; } else { - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); return NULL; } } -static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy( - struct dma_chan *chan, - dma_addr_t dma_dest, - dma_addr_t dma_src, - size_t len, - unsigned long flags) +static struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) { struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); struct ioat_desc_sw *new; @@ -1028,11 +1014,11 @@ static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy( new->len = len; new->dst = dma_dest; new->src = dma_src; - new->async_tx.flags = flags; - return &new->async_tx; + new->txd.flags = flags; + return &new->txd; } else { spin_unlock_bh(&ioat_chan->desc_lock); - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); return NULL; @@ -1050,8 +1036,8 @@ static void ioat_dma_cleanup_tasklet(unsigned long data) static void ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) { - if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (desc->async_tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) + if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE) pci_unmap_single(ioat_chan->device->pdev, pci_unmap_addr(desc, dst), pci_unmap_len(desc, len), @@ -1063,8 +1049,8 @@ ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) PCI_DMA_FROMDEVICE); } - if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (desc->async_tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) + if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE) pci_unmap_single(ioat_chan->device->pdev, pci_unmap_addr(desc, src), pci_unmap_len(desc, len), @@ -1088,6 +1074,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) dma_cookie_t cookie = 0; unsigned long desc_phys; struct ioat_desc_sw *latest_desc; + struct dma_async_tx_descriptor *tx; prefetch(ioat_chan->completion_virt); @@ -1111,8 +1098,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) if ((ioat_chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { - dev_err(&ioat_chan->device->pdev->dev, - "Channel halted, chanerr = %x\n", + dev_err(to_dev(ioat_chan), "Channel halted, chanerr = %x\n", readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET)); /* TODO do something to salvage the situation */ @@ -1145,38 +1131,38 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) case IOAT_VER_1_2: list_for_each_entry_safe(desc, _desc, &ioat_chan->used_desc, node) { - + tx = &desc->txd; /* * Incoming DMA requests may use multiple descriptors, * due to exceeding xfercap, perhaps. If so, only the * last one will have a cookie, and require unmapping. */ - if (desc->async_tx.cookie) { - cookie = desc->async_tx.cookie; + if (tx->cookie) { + cookie = tx->cookie; ioat_dma_unmap(ioat_chan, desc); - if (desc->async_tx.callback) { - desc->async_tx.callback(desc->async_tx.callback_param); - desc->async_tx.callback = NULL; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; } } - if (desc->async_tx.phys != phys_complete) { + if (tx->phys != phys_complete) { /* * a completed entry, but not the last, so clean * up if the client is done with the descriptor */ - if (async_tx_test_ack(&desc->async_tx)) { + if (async_tx_test_ack(tx)) { list_move_tail(&desc->node, &ioat_chan->free_desc); } else - desc->async_tx.cookie = 0; + tx->cookie = 0; } else { /* * last used desc. Do not remove, so we can * append from it, but don't look at it next * time, either */ - desc->async_tx.cookie = 0; + tx->cookie = 0; /* TODO check status bits? */ break; @@ -1191,10 +1177,11 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) /* work backwards to find latest finished desc */ desc = to_ioat_desc(ioat_chan->used_desc.next); + tx = &desc->txd; latest_desc = NULL; do { desc = to_ioat_desc(desc->node.prev); - desc_phys = (unsigned long)desc->async_tx.phys + desc_phys = (unsigned long)tx->phys & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; if (desc_phys == phys_complete) { latest_desc = desc; @@ -1203,19 +1190,18 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) } while (&desc->node != ioat_chan->used_desc.prev); if (latest_desc != NULL) { - /* work forwards to clear finished descriptors */ for (desc = to_ioat_desc(ioat_chan->used_desc.prev); &desc->node != latest_desc->node.next && &desc->node != ioat_chan->used_desc.next; desc = to_ioat_desc(desc->node.next)) { - if (desc->async_tx.cookie) { - cookie = desc->async_tx.cookie; - desc->async_tx.cookie = 0; + if (tx->cookie) { + cookie = tx->cookie; + tx->cookie = 0; ioat_dma_unmap(ioat_chan, desc); - if (desc->async_tx.callback) { - desc->async_tx.callback(desc->async_tx.callback_param); - desc->async_tx.callback = NULL; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; } } } @@ -1245,10 +1231,9 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) * @done: if not %NULL, updated with last completed transaction * @used: if not %NULL, updated with last used transaction */ -static enum dma_status ioat_dma_is_complete(struct dma_chan *chan, - dma_cookie_t cookie, - dma_cookie_t *done, - dma_cookie_t *used) +static enum dma_status +ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) { struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); dma_cookie_t last_used; @@ -1290,7 +1275,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) desc = ioat_dma_get_next_descriptor(ioat_chan); if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, + dev_err(to_dev(ioat_chan), "Unable to start null desc - get next desc failed\n"); spin_unlock_bh(&ioat_chan->desc_lock); return; @@ -1303,15 +1288,15 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) desc->hw->size = NULL_DESC_BUFFER_SIZE; desc->hw->src_addr = 0; desc->hw->dst_addr = 0; - async_tx_ack(&desc->async_tx); + async_tx_ack(&desc->txd); switch (ioat_chan->device->version) { case IOAT_VER_1_2: desc->hw->next = 0; list_add_tail(&desc->node, &ioat_chan->used_desc); - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, + writel(((u64) desc->txd.phys) >> 32, ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); writeb(IOAT_CHANCMD_START, ioat_chan->reg_base @@ -1319,9 +1304,9 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) break; case IOAT_VER_2_0: case IOAT_VER_3_0: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, + writel(((u64) desc->txd.phys) >> 32, ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); ioat_chan->dmacount++; @@ -1352,6 +1337,8 @@ static int ioat_dma_self_test(struct ioatdma_device *device) int i; u8 *src; u8 *dest; + struct dma_device *dma = &device->common; + struct device *dev = &device->pdev->dev; struct dma_chan *dma_chan; struct dma_async_tx_descriptor *tx; dma_addr_t dma_dest, dma_src; @@ -1375,26 +1362,21 @@ static int ioat_dma_self_test(struct ioatdma_device *device) src[i] = (u8)i; /* Start copy, using first DMA channel */ - dma_chan = container_of(device->common.channels.next, - struct dma_chan, + dma_chan = container_of(dma->channels.next, struct dma_chan, device_node); - if (device->common.device_alloc_chan_resources(dma_chan) < 1) { - dev_err(&device->pdev->dev, - "selftest cannot allocate chan resource\n"); + if (dma->device_alloc_chan_resources(dma_chan) < 1) { + dev_err(dev, "selftest cannot allocate chan resource\n"); err = -ENODEV; goto out; } - dma_src = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE, - DMA_TO_DEVICE); - dma_dest = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE, - DMA_FROM_DEVICE); + dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); + dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE; tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, IOAT_TEST_SIZE, flags); if (!tx) { - dev_err(&device->pdev->dev, - "Self-test prep failed, disabling\n"); + dev_err(dev, "Self-test prep failed, disabling\n"); err = -ENODEV; goto free_resources; } @@ -1405,32 +1387,29 @@ static int ioat_dma_self_test(struct ioatdma_device *device) tx->callback_param = &cmp; cookie = tx->tx_submit(tx); if (cookie < 0) { - dev_err(&device->pdev->dev, - "Self-test setup failed, disabling\n"); + dev_err(dev, "Self-test setup failed, disabling\n"); err = -ENODEV; goto free_resources; } - device->common.device_issue_pending(dma_chan); + dma->device_issue_pending(dma_chan); tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); if (tmo == 0 || - device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL) + dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { - dev_err(&device->pdev->dev, - "Self-test copy timed out, disabling\n"); + dev_err(dev, "Self-test copy timed out, disabling\n"); err = -ENODEV; goto free_resources; } if (memcmp(src, dest, IOAT_TEST_SIZE)) { - dev_err(&device->pdev->dev, - "Self-test copy failed compare, disabling\n"); + dev_err(dev, "Self-test copy failed compare, disabling\n"); err = -ENODEV; goto free_resources; } free_resources: - device->common.device_free_chan_resources(dma_chan); + dma->device_free_chan_resources(dma_chan); out: kfree(src); kfree(dest); @@ -1483,15 +1462,14 @@ msix: for (i = 0; i < msixcnt; i++) { msix = &device->msix_entries[i]; - ioat_chan = ioat_lookup_chan_by_index(device, i); + ioat_chan = ioat_chan_by_index(device, i); err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt_msix, 0, "ioat-msix", ioat_chan); if (err) { for (j = 0; j < i; j++) { msix = &device->msix_entries[j]; - ioat_chan = - ioat_lookup_chan_by_index(device, j); + ioat_chan = ioat_chan_by_index(device, j); devm_free_irq(dev, msix->vector, ioat_chan); } goto msix_single_vector; @@ -1561,12 +1539,13 @@ static void ioat_disable_interrupts(struct ioatdma_device *device) writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); } -struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, - void __iomem *iobase) +struct ioatdma_device * +ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase) { int err; struct device *dev = &pdev->dev; struct ioatdma_device *device; + struct dma_device *dma; device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL); if (!device) @@ -1574,6 +1553,7 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, device->pdev = pdev; device->reg_base = iobase; device->version = readb(device->reg_base + IOAT_VER_OFFSET); + dma = &device->common; /* DMA coherent memory pool for DMA descriptor allocations */ device->dma_pool = pci_pool_create("dma_desc_pool", pdev, @@ -1592,36 +1572,32 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, goto err_completion_pool; } - INIT_LIST_HEAD(&device->common.channels); + INIT_LIST_HEAD(&dma->channels); ioat_dma_enumerate_channels(device); - device->common.device_alloc_chan_resources = - ioat_dma_alloc_chan_resources; - device->common.device_free_chan_resources = - ioat_dma_free_chan_resources; - device->common.dev = &pdev->dev; + dma->device_alloc_chan_resources = ioat_dma_alloc_chan_resources; + dma->device_free_chan_resources = ioat_dma_free_chan_resources; + dma->dev = &pdev->dev; - dma_cap_set(DMA_MEMCPY, device->common.cap_mask); - device->common.device_is_tx_complete = ioat_dma_is_complete; + dma_cap_set(DMA_MEMCPY, dma->cap_mask); + dma->device_is_tx_complete = ioat_dma_is_complete; switch (device->version) { case IOAT_VER_1_2: - device->common.device_prep_dma_memcpy = ioat1_dma_prep_memcpy; - device->common.device_issue_pending = - ioat1_dma_memcpy_issue_pending; + dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; + dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; break; case IOAT_VER_2_0: case IOAT_VER_3_0: - device->common.device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - device->common.device_issue_pending = - ioat2_dma_memcpy_issue_pending; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; + dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; break; } dev_err(dev, "Intel(R) I/OAT DMA Engine found," " %d channels, device version 0x%02x, driver version %s\n", - device->common.chancnt, device->version, IOAT_DMA_VERSION); + dma->chancnt, device->version, IOAT_DMA_VERSION); - if (!device->common.chancnt) { + if (!dma->chancnt) { dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: " "zero channels detected\n"); goto err_setup_interrupts; @@ -1635,7 +1611,7 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, if (err) goto err_self_test; - err = dma_async_device_register(&device->common); + err = dma_async_device_register(dma); if (err) goto err_self_test; @@ -1663,19 +1639,19 @@ void ioat_dma_remove(struct ioatdma_device *device) { struct dma_chan *chan, *_chan; struct ioat_dma_chan *ioat_chan; + struct dma_device *dma = &device->common; if (device->version != IOAT_VER_3_0) cancel_delayed_work(&device->work); ioat_disable_interrupts(device); - dma_async_device_unregister(&device->common); + dma_async_device_unregister(dma); pci_pool_destroy(device->dma_pool); pci_pool_destroy(device->completion_pool); - list_for_each_entry_safe(chan, _chan, - &device->common.channels, device_node) { + list_for_each_entry_safe(chan, _chan, &dma->channels, device_node) { ioat_chan = to_ioat_chan(chan); list_del(&chan->device_node); } diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 5e8d7cfabc2..c5eabae4c1b 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -38,7 +38,8 @@ #define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) -#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) +#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd) +#define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev) #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) @@ -123,7 +124,7 @@ struct ioat_dma_chan { * @node: this descriptor will either be on the free list, * or attached to a transaction list (async_tx.tx_list) * @tx_cnt: number of descriptors required to complete the transaction - * @async_tx: the generic software descriptor for all engines + * @txd: the generic software descriptor for all engines */ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; @@ -132,7 +133,7 @@ struct ioat_desc_sw { size_t len; dma_addr_t src; dma_addr_t dst; - struct dma_async_tx_descriptor async_tx; + struct dma_async_tx_descriptor txd; }; static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev) From b31b78f1ab7806759622b703357e39a21f757281 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:42:32 -0700 Subject: [PATCH 32/91] ioat: kill function prototype ifdef guards The only .c files that utilize these protected prototypes depend on CONFIG_INTEL_IOATDMA=y, so there is no value gained in providing empty prototypes. [ Impact: pure cleanup ] Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.h | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index c5eabae4c1b..6e27ddb1e98 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -153,19 +153,10 @@ static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev) #endif } -#if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE) struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase); void ioat_dma_remove(struct ioatdma_device *device); struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); -#else -#define ioat_dma_probe(pdev, iobase) NULL -#define ioat_dma_remove(device) do { } while (0) -#define ioat_dca_init(pdev, iobase) NULL -#define ioat2_dca_init(pdev, iobase) NULL -#define ioat3_dca_init(pdev, iobase) NULL -#endif - #endif /* IOATDMA_H */ From f2427e276ffec5ce599c6bc116e0927269a360ef Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:42:38 -0700 Subject: [PATCH 33/91] ioat: split ioat_dma_probe into core/version-specific routines Towards the removal of ioatdma_device.version split the initialization path into distinct versions. This conversion: 1/ moves version specific probe code to version specific routines 2/ removes the need for ioat_device 3/ turns off the ioat1 msi quirk if the device is reinitialized for intx Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 253 +++++++++++++++++++++++++---------------- drivers/dma/ioat/dma.h | 23 ++-- drivers/dma/ioat/pci.c | 81 +++++++------ 3 files changed, 201 insertions(+), 156 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 462dae62719..b7508041c6d 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -121,52 +121,21 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) int i; struct ioat_dma_chan *ioat_chan; struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; - /* - * IOAT ver.3 workarounds - */ - if (device->version == IOAT_VER_3_0) { - u32 chan_err_mask; - u16 dev_id; - u32 dmauncerrsts; - - /* - * Write CHANERRMSK_INT with 3E07h to mask out the errors - * that can cause stability issues for IOAT ver.3 - */ - chan_err_mask = 0x3E07; - pci_write_config_dword(device->pdev, - IOAT_PCI_CHANERRMASK_INT_OFFSET, - chan_err_mask); - - /* - * Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit - * (workaround for spurious config parity error after restart) - */ - pci_read_config_word(device->pdev, - IOAT_PCI_DEVICE_ID_OFFSET, - &dev_id); - if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) { - dmauncerrsts = 0x10; - pci_write_config_dword(device->pdev, - IOAT_PCI_DMAUNCERRSTS_OFFSET, - dmauncerrsts); - } - } - - device->common.chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); #ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL - if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) { - device->common.chancnt--; - } + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; #endif - for (i = 0; i < device->common.chancnt; i++) { + for (i = 0; i < dma->chancnt; i++) { ioat_chan = devm_kzalloc(dev, sizeof(*ioat_chan), GFP_KERNEL); if (!ioat_chan) { - device->common.chancnt = i; + dma->chancnt = i; break; } @@ -175,28 +144,20 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) ioat_chan->xfercap = xfercap; ioat_chan->desccount = 0; INIT_DELAYED_WORK(&ioat_chan->work, ioat_dma_chan_reset_part2); - if (ioat_chan->device->version == IOAT_VER_2_0) - writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | - IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); - else if (ioat_chan->device->version == IOAT_VER_3_0) - writel(IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); spin_lock_init(&ioat_chan->cleanup_lock); spin_lock_init(&ioat_chan->desc_lock); INIT_LIST_HEAD(&ioat_chan->free_desc); INIT_LIST_HEAD(&ioat_chan->used_desc); /* This should be made common somewhere in dmaengine.c */ ioat_chan->common.device = &device->common; - list_add_tail(&ioat_chan->common.device_node, - &device->common.channels); + list_add_tail(&ioat_chan->common.device_node, &dma->channels); device->idx[i] = ioat_chan; tasklet_init(&ioat_chan->cleanup_task, ioat_dma_cleanup_tasklet, (unsigned long) ioat_chan); tasklet_disable(&ioat_chan->cleanup_task); } - return device->common.chancnt; + return dma->chancnt; } /** @@ -1504,15 +1465,6 @@ msi: pci_disable_msi(pdev); goto intx; } - /* - * CB 1.2 devices need a bit set in configuration space to enable MSI - */ - if (device->version == IOAT_VER_1_2) { - u32 dmactrl; - pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); - dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; - pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); - } goto done; intx: @@ -1522,6 +1474,8 @@ intx: goto err_no_irq; done: + if (device->intr_quirk) + device->intr_quirk(device); intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); return 0; @@ -1539,21 +1493,12 @@ static void ioat_disable_interrupts(struct ioatdma_device *device) writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); } -struct ioatdma_device * -ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase) +static int ioat_probe(struct ioatdma_device *device) { - int err; + int err = -ENODEV; + struct dma_device *dma = &device->common; + struct pci_dev *pdev = device->pdev; struct device *dev = &pdev->dev; - struct ioatdma_device *device; - struct dma_device *dma; - - device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL); - if (!device) - err = -ENOMEM; - device->pdev = pdev; - device->reg_base = iobase; - device->version = readb(device->reg_base + IOAT_VER_OFFSET); - dma = &device->common; /* DMA coherent memory pool for DMA descriptor allocations */ device->dma_pool = pci_pool_create("dma_desc_pool", pdev, @@ -1572,26 +1517,13 @@ ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase) goto err_completion_pool; } - INIT_LIST_HEAD(&dma->channels); ioat_dma_enumerate_channels(device); + dma_cap_set(DMA_MEMCPY, dma->cap_mask); dma->device_alloc_chan_resources = ioat_dma_alloc_chan_resources; dma->device_free_chan_resources = ioat_dma_free_chan_resources; - dma->dev = &pdev->dev; - - dma_cap_set(DMA_MEMCPY, dma->cap_mask); dma->device_is_tx_complete = ioat_dma_is_complete; - switch (device->version) { - case IOAT_VER_1_2: - dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; - dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; - break; - } + dma->dev = &pdev->dev; dev_err(dev, "Intel(R) I/OAT DMA Engine found," " %d channels, device version 0x%02x, driver version %s\n", @@ -1611,19 +1543,7 @@ ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase) if (err) goto err_self_test; - err = dma_async_device_register(dma); - if (err) - goto err_self_test; - - ioat_set_tcp_copy_break(device); - - if (device->version != IOAT_VER_3_0) { - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); - schedule_delayed_work(&device->work, - WATCHDOG_DELAY); - } - - return device; + return 0; err_self_test: ioat_disable_interrupts(device); @@ -1632,7 +1552,142 @@ err_setup_interrupts: err_completion_pool: pci_pool_destroy(device->dma_pool); err_dma_pool: - return NULL; + return err; +} + +static int ioat_register(struct ioatdma_device *device) +{ + int err = dma_async_device_register(&device->common); + + if (err) { + ioat_disable_interrupts(device); + pci_pool_destroy(device->completion_pool); + pci_pool_destroy(device->dma_pool); + } + + return err; +} + +/* ioat1_intr_quirk - fix up dma ctrl register to enable / disable msi */ +static void ioat1_intr_quirk(struct ioatdma_device *device) +{ + struct pci_dev *pdev = device->pdev; + u32 dmactrl; + + pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); + if (pdev->msi_enabled) + dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; + else + dmactrl &= ~IOAT_PCI_DMACTRL_MSI_EN; + pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); +} + +int ioat1_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + int err; + + device->intr_quirk = ioat1_intr_quirk; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; + dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(4096); + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat_dca_init(pdev, device->reg_base); + + INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); + schedule_delayed_work(&device->work, WATCHDOG_DELAY); + + return err; +} + +int ioat2_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *chan; + struct ioat_dma_chan *ioat_chan; + int err; + + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; + dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(2048); + + list_for_each_entry(chan, &dma->channels, device_node) { + ioat_chan = to_ioat_chan(chan); + writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, + ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat2_dca_init(pdev, device->reg_base); + + INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); + schedule_delayed_work(&device->work, WATCHDOG_DELAY); + + return err; +} + +int ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *chan; + struct ioat_dma_chan *ioat_chan; + int err; + u16 dev_id; + + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; + dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; + + /* -= IOAT ver.3 workarounds =- */ + /* Write CHANERRMSK_INT with 3E07h to mask out the errors + * that can cause stability issues for IOAT ver.3 + */ + pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) + pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(262144); + + list_for_each_entry(chan, &dma->channels, device_node) { + ioat_chan = to_ioat_chan(chan); + writel(IOAT_DMA_DCA_ANY_CPU, + ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return err; } void ioat_dma_remove(struct ioatdma_device *device) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 6e27ddb1e98..1226e35f270 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -61,6 +61,8 @@ * @version: version of ioatdma device * @msix_entries: irq handlers * @idx: per channel data + * @dca: direct cache access context + * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) */ struct ioatdma_device { @@ -73,6 +75,8 @@ struct ioatdma_device { struct delayed_work work; struct msix_entry msix_entries[4]; struct ioat_dma_chan *idx[4]; + struct dca_provider *dca; + void (*intr_quirk)(struct ioatdma_device *device); }; /** @@ -136,25 +140,16 @@ struct ioat_desc_sw { struct dma_async_tx_descriptor txd; }; -static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev) +static inline void ioat_set_tcp_copy_break(unsigned long copybreak) { #ifdef CONFIG_NET_DMA - switch (dev->version) { - case IOAT_VER_1_2: - sysctl_tcp_dma_copybreak = 4096; - break; - case IOAT_VER_2_0: - sysctl_tcp_dma_copybreak = 2048; - break; - case IOAT_VER_3_0: - sysctl_tcp_dma_copybreak = 262144; - break; - } + sysctl_tcp_dma_copybreak = copybreak; #endif } -struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, - void __iomem *iobase); +int ioat1_dma_probe(struct ioatdma_device *dev, int dca); +int ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int ioat3_dma_probe(struct ioatdma_device *dev, int dca); void ioat_dma_remove(struct ioatdma_device *device); struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 982e38fd177..55414d88ac1 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -60,14 +60,8 @@ static struct pci_device_id ioat_pci_tbl[] = { { 0, } }; -struct ioat_device { - struct pci_dev *pdev; - struct ioatdma_device *dma; - struct dca_provider *dca; -}; - -static int __devinit ioat_probe(struct pci_dev *pdev, - const struct pci_device_id *id); +static int __devinit ioat_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *id); static void __devexit ioat_remove(struct pci_dev *pdev); static int ioat_dca_enabled = 1; @@ -79,17 +73,28 @@ MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)" static struct pci_driver ioat_pci_driver = { .name = DRV_NAME, .id_table = ioat_pci_tbl, - .probe = ioat_probe, + .probe = ioat_pci_probe, .remove = __devexit_p(ioat_remove), }; -static int __devinit ioat_probe(struct pci_dev *pdev, - const struct pci_device_id *id) +static struct ioatdma_device * +alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase) +{ + struct device *dev = &pdev->dev; + struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); + + if (!d) + return NULL; + d->pdev = pdev; + d->reg_base = iobase; + return d; +} + +static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { void __iomem * const *iomap; - void __iomem *iobase; struct device *dev = &pdev->dev; - struct ioat_device *device; + struct ioatdma_device *device; int err; err = pcim_enable_device(pdev); @@ -119,33 +124,24 @@ static int __devinit ioat_probe(struct pci_dev *pdev, if (!device) return -ENOMEM; - device->pdev = pdev; - pci_set_drvdata(pdev, device); - iobase = iomap[IOAT_MMIO_BAR]; - pci_set_master(pdev); - switch (readb(iobase + IOAT_VER_OFFSET)) { - case IOAT_VER_1_2: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat_dca_init(pdev, iobase); - break; - case IOAT_VER_2_0: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat2_dca_init(pdev, iobase); - break; - case IOAT_VER_3_0: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat3_dca_init(pdev, iobase); - break; - default: - return -ENODEV; - } + device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]); + if (!device) + return -ENOMEM; + pci_set_drvdata(pdev, device); - if (!device->dma) { + device->version = readb(device->reg_base + IOAT_VER_OFFSET); + if (device->version == IOAT_VER_1_2) + err = ioat1_dma_probe(device, ioat_dca_enabled); + else if (device->version == IOAT_VER_2_0) + err = ioat2_dma_probe(device, ioat_dca_enabled); + else if (device->version >= IOAT_VER_3_0) + err = ioat3_dma_probe(device, ioat_dca_enabled); + else + return -ENODEV; + + if (err) { dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); return -ENODEV; } @@ -155,7 +151,10 @@ static int __devinit ioat_probe(struct pci_dev *pdev, static void __devexit ioat_remove(struct pci_dev *pdev) { - struct ioat_device *device = pci_get_drvdata(pdev); + struct ioatdma_device *device = pci_get_drvdata(pdev); + + if (!device) + return; dev_err(&pdev->dev, "Removing dma and dca services\n"); if (device->dca) { @@ -163,11 +162,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev) free_dca_provider(device->dca); device->dca = NULL; } - - if (device->dma) { - ioat_dma_remove(device->dma); - device->dma = NULL; - } + ioat_dma_remove(device); } static int __init ioat_init_module(void) From 77867fff033ea549096c49d863c564ad7d8be36f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:44:04 -0700 Subject: [PATCH 34/91] ioat: fix type mismatch for ->dmacount ->dmacount tracks the sequence number of active descriptors. It is written to the DMACOUNT register to update the channel's view of pending descriptors in the chain. The register is 16-bits so ->dmacount should be unsigned and 16-bit as well. Also modify ->desccount to maintain alignment. This was never a problem in practice because we never compared dmacount values, but this is a bug waiting to happen. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 1226e35f270..9f0c853b6a7 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -102,8 +102,8 @@ struct ioat_dma_chan { struct delayed_work work; int pending; - int dmacount; - int desccount; + u16 dmacount; + u16 desccount; struct ioatdma_device *device; struct dma_chan common; From c7984f4e4e3af3bf8027d636283ea8658c7f80b9 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:44:04 -0700 Subject: [PATCH 35/91] ioat: define descriptor control bit-field This cleans up a mess of and'ing and or'ing bit definitions, and allows simple assignments from the specified dma_ctrl_flags parameter. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 28 ++++++++++++++++------------ drivers/dma/ioat/hw.h | 38 ++++++++++++++++++-------------------- 2 files changed, 34 insertions(+), 32 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index b7508041c6d..4840d4805d8 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -472,9 +472,9 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) return -ENOMEM; } - hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; + hw->ctl_f.compl_write = 1; if (first->txd.callback) { - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; + hw->ctl_f.int_en = 1; if (first != new) { /* move callback into to last desc */ new->txd.callback = first->txd.callback; @@ -563,9 +563,9 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) return -ENOMEM; } - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_CP_STS; + hw->ctl_f.compl_write = 1; if (first->txd.callback) { - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; + hw->ctl_f.int_en = 1; if (first != new) { /* move callback into to last desc */ new->txd.callback = first->txd.callback; @@ -878,7 +878,8 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) noop_desc = to_ioat_desc(ioat_chan->used_desc.next); /* set size to non-zero value (channel returns error when size is 0) */ noop_desc->hw->size = NULL_DESC_BUFFER_SIZE; - noop_desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL; + noop_desc->hw->ctl = 0; + noop_desc->hw->ctl_f.null = 1; noop_desc->hw->src_addr = 0; noop_desc->hw->dst_addr = 0; @@ -1230,6 +1231,7 @@ ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie, static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) { struct ioat_desc_sw *desc; + struct ioat_dma_descriptor *hw; spin_lock_bh(&ioat_chan->desc_lock); @@ -1242,17 +1244,19 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) return; } - desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL - | IOAT_DMA_DESCRIPTOR_CTL_INT_GN - | IOAT_DMA_DESCRIPTOR_CTL_CP_STS; + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; /* set size to non-zero value (channel returns error when size is 0) */ - desc->hw->size = NULL_DESC_BUFFER_SIZE; - desc->hw->src_addr = 0; - desc->hw->dst_addr = 0; + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; async_tx_ack(&desc->txd); switch (ioat_chan->device->version) { case IOAT_VER_1_2: - desc->hw->next = 0; + hw->next = 0; list_add_tail(&desc->node, &ioat_chan->used_desc); writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h index 1438fa5c4d1..e13f3ed4776 100644 --- a/drivers/dma/ioat/hw.h +++ b/drivers/dma/ioat/hw.h @@ -40,7 +40,24 @@ struct ioat_dma_descriptor { uint32_t size; - uint32_t ctl; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int null:1; + unsigned int src_brk:1; + unsigned int dest_brk:1; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int rsvd2:13; + unsigned int op:8; + } ctl_f; + }; uint64_t src_addr; uint64_t dst_addr; uint64_t next; @@ -49,23 +66,4 @@ struct ioat_dma_descriptor { uint64_t user1; uint64_t user2; }; - -#define IOAT_DMA_DESCRIPTOR_CTL_INT_GN 0x00000001 -#define IOAT_DMA_DESCRIPTOR_CTL_SRC_SN 0x00000002 -#define IOAT_DMA_DESCRIPTOR_CTL_DST_SN 0x00000004 -#define IOAT_DMA_DESCRIPTOR_CTL_CP_STS 0x00000008 -#define IOAT_DMA_DESCRIPTOR_CTL_FRAME 0x00000010 -#define IOAT_DMA_DESCRIPTOR_NUL 0x00000020 -#define IOAT_DMA_DESCRIPTOR_CTL_SP_BRK 0x00000040 -#define IOAT_DMA_DESCRIPTOR_CTL_DP_BRK 0x00000080 -#define IOAT_DMA_DESCRIPTOR_CTL_BNDL 0x00000100 -#define IOAT_DMA_DESCRIPTOR_CTL_DCA 0x00000200 -#define IOAT_DMA_DESCRIPTOR_CTL_BUFHINT 0x00000400 - -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_CONTEXT 0xFF000000 -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_DMA 0x00000000 - -#define IOAT_DMA_DESCRIPTOR_CTL_CONTEXT_DCA 0x00000001 -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_MASK 0xFF000000 - #endif From a0587bcf3e64029a4da2a5666cad18df38db0d56 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:44:04 -0700 Subject: [PATCH 36/91] ioat1: move descriptor allocation from submit to prep The async_tx api assumes that after a successful ->prep a subsequent ->submit will not fail due to a lack of resources. This also fixes a bug in the allocation failure case. Previously the descriptors allocated prior to the allocation failure would not be returned to the free list. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 152 +++++++++++++++++------------------------ 1 file changed, 64 insertions(+), 88 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 4840d4805d8..c4333be0760 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -420,95 +420,29 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) { struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); - struct ioat_desc_sw *first = tx_to_ioat_desc(tx); - struct ioat_desc_sw *prev, *new; - struct ioat_dma_descriptor *hw; + struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); + struct ioat_desc_sw *first; + struct ioat_desc_sw *chain_tail; dma_cookie_t cookie; - LIST_HEAD(new_chain); - u32 copy; - size_t len; - dma_addr_t src, dst; - unsigned long orig_flags; - unsigned int desc_count = 0; - - /* src and dest and len are stored in the initial descriptor */ - len = first->len; - src = first->src; - dst = first->dst; - orig_flags = first->txd.flags; - new = first; spin_lock_bh(&ioat_chan->desc_lock); - prev = to_ioat_desc(ioat_chan->used_desc.prev); - prefetch(prev->hw); - do { - copy = min_t(size_t, len, ioat_chan->xfercap); - - async_tx_ack(&new->txd); - - hw = new->hw; - hw->size = copy; - hw->ctl = 0; - hw->src_addr = src; - hw->dst_addr = dst; - hw->next = 0; - - /* chain together the physical address list for the HW */ - wmb(); - prev->hw->next = (u64) new->txd.phys; - - len -= copy; - dst += copy; - src += copy; - - list_add_tail(&new->node, &new_chain); - desc_count++; - prev = new; - } while (len && (new = ioat1_dma_get_next_descriptor(ioat_chan))); - - if (!new) { - dev_err(to_dev(ioat_chan), "tx submit failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); - return -ENOMEM; - } - - hw->ctl_f.compl_write = 1; - if (first->txd.callback) { - hw->ctl_f.int_en = 1; - if (first != new) { - /* move callback into to last desc */ - new->txd.callback = first->txd.callback; - new->txd.callback_param - = first->txd.callback_param; - first->txd.callback = NULL; - first->txd.callback_param = NULL; - } - } - - new->tx_cnt = desc_count; - new->txd.flags = orig_flags; /* client is in control of this ack */ - - /* store the original values for use in later cleanup */ - if (new != first) { - new->src = first->src; - new->dst = first->dst; - new->len = first->len; - } - /* cookie incr and addition to used_list must be atomic */ cookie = ioat_chan->common.cookie; cookie++; if (cookie < 0) cookie = 1; - ioat_chan->common.cookie = new->txd.cookie = cookie; + ioat_chan->common.cookie = tx->cookie = cookie; /* write address into NextDescriptor field of last desc in chain */ - to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = - first->txd.phys; - list_splice_tail(&new_chain, &ioat_chan->used_desc); + first = to_ioat_desc(tx->tx_list.next); + chain_tail = to_ioat_desc(ioat_chan->used_desc.prev); + /* make descriptor updates globally visible before chaining */ + wmb(); + chain_tail->hw->next = first->txd.phys; + list_splice_tail_init(&tx->tx_list, &ioat_chan->used_desc); - ioat_chan->dmacount += desc_count; - ioat_chan->pending += desc_count; + ioat_chan->dmacount += desc->tx_cnt; + ioat_chan->pending += desc->tx_cnt; if (ioat_chan->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat_chan); spin_unlock_bh(&ioat_chan->desc_lock); @@ -937,24 +871,66 @@ ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) { struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioat_desc_sw *new; + struct ioat_desc_sw *desc; + size_t copy; + LIST_HEAD(chain); + dma_addr_t src = dma_src; + dma_addr_t dest = dma_dest; + size_t total_len = len; + struct ioat_dma_descriptor *hw = NULL; + int tx_cnt = 0; spin_lock_bh(&ioat_chan->desc_lock); - new = ioat_dma_get_next_descriptor(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + desc = ioat_dma_get_next_descriptor(ioat_chan); + do { + if (!desc) + break; - if (new) { - new->len = len; - new->dst = dma_dest; - new->src = dma_src; - new->txd.flags = flags; - return &new->txd; - } else { + tx_cnt++; + copy = min_t(size_t, len, ioat_chan->xfercap); + + hw = desc->hw; + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dest; + + list_add_tail(&desc->node, &chain); + + len -= copy; + dest += copy; + src += copy; + if (len) { + struct ioat_desc_sw *next; + + async_tx_ack(&desc->txd); + next = ioat_dma_get_next_descriptor(ioat_chan); + hw->next = next ? next->txd.phys : 0; + desc = next; + } else + hw->next = 0; + } while (len); + + if (!desc) { dev_err(to_dev(ioat_chan), "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); + list_splice(&chain, &ioat_chan->free_desc); + spin_unlock_bh(&ioat_chan->desc_lock); return NULL; } + spin_unlock_bh(&ioat_chan->desc_lock); + + desc->txd.flags = flags; + desc->tx_cnt = tx_cnt; + desc->src = dma_src; + desc->dst = dma_dest; + desc->len = total_len; + list_splice(&chain, &desc->txd.tx_list); + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + + return &desc->txd; } static struct dma_async_tx_descriptor * From a6a39ca1badbeafc16941fcf2c1010c8c65c8ddc Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:44:05 -0700 Subject: [PATCH 37/91] ioat: fix self test interrupts If a callback is to be attached to a descriptor the channel needs to know at ->prep time so it can set the interrupt enable bit. This is in preparation for moving descriptor ioat2 descriptor preparation from ->submit to ->prep. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index c4333be0760..cc5c557ddc8 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -1313,7 +1313,8 @@ static int ioat_dma_self_test(struct ioatdma_device *device) dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); - flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE; + flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE | + DMA_PREP_INTERRUPT; tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, IOAT_TEST_SIZE, flags); if (!tx) { From dcbc853af6f0c056088e4df0794d9bf36184809e Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 28 Jul 2009 14:44:50 -0700 Subject: [PATCH 38/91] ioat: prepare the code for ioat[12]_dma_chan split Prepare the code for the conversion of the ioat2 linked-list-ring into a native ring buffer. After this conversion ioat2 channels will share less of the ioat1 infrastructure, but there will still be places where sharing is possible. struct ioat_chan_common is created to house the channel attributes that will remain common between ioat1 and ioat2 channels. For every routine that accesses both common and hardware specific fields the old unified 'ioat_chan' pointer is split into an 'ioat' and 'chan' pointer. Where 'chan' references common fields and 'ioat' the hardware/version specific. [ Impact: pure structure member movement/variable renames, no logic changes ] Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 709 +++++++++++++++++++++-------------------- drivers/dma/ioat/dma.h | 49 ++- 2 files changed, 389 insertions(+), 369 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index cc5c557ddc8..2e81e0c76e6 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -47,15 +47,15 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work); static void ioat_dma_chan_watchdog(struct work_struct *work); /* internal functions */ -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan); -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan); +static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat); +static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat); static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); +ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat); static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); +ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat); -static inline struct ioat_dma_chan * +static inline struct ioat_chan_common * ioat_chan_by_index(struct ioatdma_device *device, int index) { return device->idx[index]; @@ -69,7 +69,7 @@ ioat_chan_by_index(struct ioatdma_device *device, int index) static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) { struct ioatdma_device *instance = data; - struct ioat_dma_chan *ioat_chan; + struct ioat_chan_common *chan; unsigned long attnstatus; int bit; u8 intrctrl; @@ -86,8 +86,8 @@ static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); for_each_bit(bit, &attnstatus, BITS_PER_LONG) { - ioat_chan = ioat_chan_by_index(instance, bit); - tasklet_schedule(&ioat_chan->cleanup_task); + chan = ioat_chan_by_index(instance, bit); + tasklet_schedule(&chan->cleanup_task); } writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); @@ -101,9 +101,9 @@ static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) */ static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) { - struct ioat_dma_chan *ioat_chan = data; + struct ioat_chan_common *chan = data; - tasklet_schedule(&ioat_chan->cleanup_task); + tasklet_schedule(&chan->cleanup_task); return IRQ_HANDLED; } @@ -119,7 +119,8 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) u8 xfercap_scale; u32 xfercap; int i; - struct ioat_dma_chan *ioat_chan; + struct ioat_chan_common *chan; + struct ioat_dma_chan *ioat; struct device *dev = &device->pdev->dev; struct dma_device *dma = &device->common; @@ -133,29 +134,30 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) dma->chancnt--; #endif for (i = 0; i < dma->chancnt; i++) { - ioat_chan = devm_kzalloc(dev, sizeof(*ioat_chan), GFP_KERNEL); - if (!ioat_chan) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) { dma->chancnt = i; break; } - ioat_chan->device = device; - ioat_chan->reg_base = device->reg_base + (0x80 * (i + 1)); - ioat_chan->xfercap = xfercap; - ioat_chan->desccount = 0; - INIT_DELAYED_WORK(&ioat_chan->work, ioat_dma_chan_reset_part2); - spin_lock_init(&ioat_chan->cleanup_lock); - spin_lock_init(&ioat_chan->desc_lock); - INIT_LIST_HEAD(&ioat_chan->free_desc); - INIT_LIST_HEAD(&ioat_chan->used_desc); + chan = &ioat->base; + chan->device = device; + chan->reg_base = device->reg_base + (0x80 * (i + 1)); + ioat->xfercap = xfercap; + ioat->desccount = 0; + INIT_DELAYED_WORK(&chan->work, ioat_dma_chan_reset_part2); + spin_lock_init(&chan->cleanup_lock); + spin_lock_init(&ioat->desc_lock); + INIT_LIST_HEAD(&ioat->free_desc); + INIT_LIST_HEAD(&ioat->used_desc); /* This should be made common somewhere in dmaengine.c */ - ioat_chan->common.device = &device->common; - list_add_tail(&ioat_chan->common.device_node, &dma->channels); - device->idx[i] = ioat_chan; - tasklet_init(&ioat_chan->cleanup_task, + chan->common.device = &device->common; + list_add_tail(&chan->common.device_node, &dma->channels); + device->idx[i] = chan; + tasklet_init(&chan->cleanup_task, ioat_dma_cleanup_tasklet, - (unsigned long) ioat_chan); - tasklet_disable(&ioat_chan->cleanup_task); + (unsigned long) ioat); + tasklet_disable(&chan->cleanup_task); } return dma->chancnt; } @@ -166,39 +168,42 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) * @chan: DMA channel handle */ static inline void -__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat_chan) +__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) { - ioat_chan->pending = 0; - writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET); + void __iomem *reg_base = ioat->base.reg_base; + + ioat->pending = 0; + writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET); } static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(chan); - if (ioat_chan->pending > 0) { - spin_lock_bh(&ioat_chan->desc_lock); - __ioat1_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + if (ioat->pending > 0) { + spin_lock_bh(&ioat->desc_lock); + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); } } static inline void -__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat_chan) +__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) { - ioat_chan->pending = 0; - writew(ioat_chan->dmacount, - ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + void __iomem *reg_base = ioat->base.reg_base; + + ioat->pending = 0; + writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); } static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(chan); - if (ioat_chan->pending > 0) { - spin_lock_bh(&ioat_chan->desc_lock); - __ioat2_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + if (ioat->pending > 0) { + spin_lock_bh(&ioat->desc_lock); + __ioat2_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); } } @@ -208,84 +213,88 @@ static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) */ static void ioat_dma_chan_reset_part2(struct work_struct *work) { - struct ioat_dma_chan *ioat_chan = - container_of(work, struct ioat_dma_chan, work.work); + struct ioat_chan_common *chan; + struct ioat_dma_chan *ioat; struct ioat_desc_sw *desc; - spin_lock_bh(&ioat_chan->cleanup_lock); - spin_lock_bh(&ioat_chan->desc_lock); + chan = container_of(work, struct ioat_chan_common, work.work); + ioat = container_of(chan, struct ioat_dma_chan, base); + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->desc_lock); - ioat_chan->completion_virt->low = 0; - ioat_chan->completion_virt->high = 0; - ioat_chan->pending = 0; + chan->completion_virt->low = 0; + chan->completion_virt->high = 0; + ioat->pending = 0; /* * count the descriptors waiting, and be sure to do it * right for both the CB1 line and the CB2 ring */ - ioat_chan->dmacount = 0; - if (ioat_chan->used_desc.prev) { - desc = to_ioat_desc(ioat_chan->used_desc.prev); + ioat->dmacount = 0; + if (ioat->used_desc.prev) { + desc = to_ioat_desc(ioat->used_desc.prev); do { - ioat_chan->dmacount++; + ioat->dmacount++; desc = to_ioat_desc(desc->node.next); - } while (&desc->node != ioat_chan->used_desc.next); + } while (&desc->node != ioat->used_desc.next); } /* * write the new starting descriptor address * this puts channel engine into ARMED state */ - desc = to_ioat_desc(ioat_chan->used_desc.prev); - switch (ioat_chan->device->version) { + desc = to_ioat_desc(ioat->used_desc.prev); + switch (chan->device->version) { case IOAT_VER_1_2: writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - writeb(IOAT_CHANCMD_START, ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); + writeb(IOAT_CHANCMD_START, chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); break; case IOAT_VER_2_0: writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); /* tell the engine to go with what's left to be done */ - writew(ioat_chan->dmacount, - ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + writew(ioat->dmacount, + chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); break; } - dev_err(to_dev(ioat_chan), + dev_err(to_dev(chan), "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); + chan_num(chan), ioat->dmacount, ioat->desccount); - spin_unlock_bh(&ioat_chan->desc_lock); - spin_unlock_bh(&ioat_chan->cleanup_lock); + spin_unlock_bh(&ioat->desc_lock); + spin_unlock_bh(&chan->cleanup_lock); } /** * ioat_dma_reset_channel - restart a channel - * @ioat_chan: IOAT DMA channel handle + * @ioat: IOAT DMA channel handle */ -static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat_chan) +static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat) { + struct ioat_chan_common *chan = &ioat->base; + void __iomem *reg_base = chan->reg_base; u32 chansts, chanerr; - if (!ioat_chan->used_desc.prev) + if (!ioat->used_desc.prev) return; - chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); - chansts = (ioat_chan->completion_virt->low + chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); + chansts = (chan->completion_virt->low & IOAT_CHANSTS_DMA_TRANSFER_STATUS); if (chanerr) { - dev_err(to_dev(ioat_chan), + dev_err(to_dev(chan), "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", - chan_num(ioat_chan), chansts, chanerr); - writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); + chan_num(chan), chansts, chanerr); + writel(chanerr, reg_base + IOAT_CHANERR_OFFSET); } /* @@ -296,15 +305,14 @@ static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat_chan) * while we're waiting. */ - spin_lock_bh(&ioat_chan->desc_lock); - ioat_chan->pending = INT_MIN; + spin_lock_bh(&ioat->desc_lock); + ioat->pending = INT_MIN; writeb(IOAT_CHANCMD_RESET, - ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); - spin_unlock_bh(&ioat_chan->desc_lock); + reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + spin_unlock_bh(&ioat->desc_lock); /* schedule the 2nd half instead of sleeping a long time */ - schedule_delayed_work(&ioat_chan->work, RESET_DELAY); + schedule_delayed_work(&chan->work, RESET_DELAY); } /** @@ -314,7 +322,8 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) { struct ioatdma_device *device = container_of(work, struct ioatdma_device, work.work); - struct ioat_dma_chan *ioat_chan; + struct ioat_dma_chan *ioat; + struct ioat_chan_common *chan; int i; union { @@ -327,23 +336,21 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) unsigned long compl_desc_addr_hw; for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = ioat_chan_by_index(device, i); + chan = ioat_chan_by_index(device, i); + ioat = container_of(chan, struct ioat_dma_chan, base); - if (ioat_chan->device->version == IOAT_VER_1_2 + if (chan->device->version == IOAT_VER_1_2 /* have we started processing anything yet */ - && ioat_chan->last_completion + && chan->last_completion /* have we completed any since last watchdog cycle? */ - && (ioat_chan->last_completion == - ioat_chan->watchdog_completion) + && (chan->last_completion == chan->watchdog_completion) /* has TCP stuck on one cookie since last watchdog? */ - && (ioat_chan->watchdog_tcp_cookie == - ioat_chan->watchdog_last_tcp_cookie) - && (ioat_chan->watchdog_tcp_cookie != - ioat_chan->completed_cookie) + && (chan->watchdog_tcp_cookie == chan->watchdog_last_tcp_cookie) + && (chan->watchdog_tcp_cookie != chan->completed_cookie) /* is there something in the chain to be processed? */ /* CB1 chain always has at least the last one processed */ - && (ioat_chan->used_desc.prev != ioat_chan->used_desc.next) - && ioat_chan->pending == 0) { + && (ioat->used_desc.prev != ioat->used_desc.next) + && ioat->pending == 0) { /* * check CHANSTS register for completed @@ -360,10 +367,10 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) * try resetting the channel */ - completion_hw.low = readl(ioat_chan->reg_base + - IOAT_CHANSTS_OFFSET_LOW(ioat_chan->device->version)); - completion_hw.high = readl(ioat_chan->reg_base + - IOAT_CHANSTS_OFFSET_HIGH(ioat_chan->device->version)); + completion_hw.low = readl(chan->reg_base + + IOAT_CHANSTS_OFFSET_LOW(chan->device->version)); + completion_hw.high = readl(chan->reg_base + + IOAT_CHANSTS_OFFSET_HIGH(chan->device->version)); #if (BITS_PER_LONG == 64) compl_desc_addr_hw = completion_hw.full @@ -374,15 +381,15 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) #endif if ((compl_desc_addr_hw != 0) - && (compl_desc_addr_hw != ioat_chan->watchdog_completion) - && (compl_desc_addr_hw != ioat_chan->last_compl_desc_addr_hw)) { - ioat_chan->last_compl_desc_addr_hw = compl_desc_addr_hw; - ioat_chan->completion_virt->low = completion_hw.low; - ioat_chan->completion_virt->high = completion_hw.high; + && (compl_desc_addr_hw != chan->watchdog_completion) + && (compl_desc_addr_hw != chan->last_compl_desc_addr_hw)) { + chan->last_compl_desc_addr_hw = compl_desc_addr_hw; + chan->completion_virt->low = completion_hw.low; + chan->completion_virt->high = completion_hw.high; } else { - ioat_dma_reset_channel(ioat_chan); - ioat_chan->watchdog_completion = 0; - ioat_chan->last_compl_desc_addr_hw = 0; + ioat_dma_reset_channel(ioat); + chan->watchdog_completion = 0; + chan->last_compl_desc_addr_hw = 0; } /* @@ -393,25 +400,22 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) * else * try resetting the channel */ - } else if (ioat_chan->device->version == IOAT_VER_2_0 - && ioat_chan->used_desc.prev - && ioat_chan->last_completion - && ioat_chan->last_completion == ioat_chan->watchdog_completion) { + } else if (chan->device->version == IOAT_VER_2_0 + && ioat->used_desc.prev + && chan->last_completion + && chan->last_completion == chan->watchdog_completion) { - if (ioat_chan->pending < ioat_pending_level) - ioat2_dma_memcpy_issue_pending(&ioat_chan->common); + if (ioat->pending < ioat_pending_level) + ioat2_dma_memcpy_issue_pending(&chan->common); else { - ioat_dma_reset_channel(ioat_chan); - ioat_chan->watchdog_completion = 0; + ioat_dma_reset_channel(ioat); + chan->watchdog_completion = 0; } } else { - ioat_chan->last_compl_desc_addr_hw = 0; - ioat_chan->watchdog_completion - = ioat_chan->last_completion; + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_completion = chan->last_completion; } - - ioat_chan->watchdog_last_tcp_cookie = - ioat_chan->watchdog_tcp_cookie; + chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; } schedule_delayed_work(&device->work, WATCHDOG_DELAY); @@ -419,40 +423,42 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); + struct dma_chan *c = tx->chan; + struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); struct ioat_desc_sw *first; struct ioat_desc_sw *chain_tail; dma_cookie_t cookie; - spin_lock_bh(&ioat_chan->desc_lock); + spin_lock_bh(&ioat->desc_lock); /* cookie incr and addition to used_list must be atomic */ - cookie = ioat_chan->common.cookie; + cookie = c->cookie; cookie++; if (cookie < 0) cookie = 1; - ioat_chan->common.cookie = tx->cookie = cookie; + c->cookie = cookie; + tx->cookie = cookie; /* write address into NextDescriptor field of last desc in chain */ first = to_ioat_desc(tx->tx_list.next); - chain_tail = to_ioat_desc(ioat_chan->used_desc.prev); + chain_tail = to_ioat_desc(ioat->used_desc.prev); /* make descriptor updates globally visible before chaining */ wmb(); chain_tail->hw->next = first->txd.phys; - list_splice_tail_init(&tx->tx_list, &ioat_chan->used_desc); + list_splice_tail_init(&tx->tx_list, &ioat->used_desc); - ioat_chan->dmacount += desc->tx_cnt; - ioat_chan->pending += desc->tx_cnt; - if (ioat_chan->pending >= ioat_pending_level) - __ioat1_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + ioat->dmacount += desc->tx_cnt; + ioat->pending += desc->tx_cnt; + if (ioat->pending >= ioat_pending_level) + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); return cookie; } static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); + struct ioat_dma_chan *ioat = to_ioat_chan(tx->chan); struct ioat_desc_sw *first = tx_to_ioat_desc(tx); struct ioat_desc_sw *new; struct ioat_dma_descriptor *hw; @@ -471,11 +477,11 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) new = first; /* - * ioat_chan->desc_lock is still in force in version 2 path + * ioat->desc_lock is still in force in version 2 path * it gets unlocked at end of this function */ do { - copy = min_t(size_t, len, ioat_chan->xfercap); + copy = min_t(size_t, len, ioat->xfercap); async_tx_ack(&new->txd); @@ -489,11 +495,11 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) dst += copy; src += copy; desc_count++; - } while (len && (new = ioat2_dma_get_next_descriptor(ioat_chan))); + } while (len && (new = ioat2_dma_get_next_descriptor(ioat))); if (!new) { - dev_err(to_dev(ioat_chan), "tx submit failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); + dev_err(to_dev(&ioat->base), "tx submit failed\n"); + spin_unlock_bh(&ioat->desc_lock); return -ENOMEM; } @@ -521,35 +527,35 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) } /* cookie incr and addition to used_list must be atomic */ - cookie = ioat_chan->common.cookie; + cookie = ioat->base.common.cookie; cookie++; if (cookie < 0) cookie = 1; - ioat_chan->common.cookie = new->txd.cookie = cookie; + ioat->base.common.cookie = new->txd.cookie = cookie; - ioat_chan->dmacount += desc_count; - ioat_chan->pending += desc_count; - if (ioat_chan->pending >= ioat_pending_level) - __ioat2_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + ioat->dmacount += desc_count; + ioat->pending += desc_count; + if (ioat->pending >= ioat_pending_level) + __ioat2_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); return cookie; } /** * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair - * @ioat_chan: the channel supplying the memory pool for the descriptors + * @ioat: the channel supplying the memory pool for the descriptors * @flags: allocation flags */ static struct ioat_desc_sw * -ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat_chan, gfp_t flags) +ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) { struct ioat_dma_descriptor *desc; struct ioat_desc_sw *desc_sw; struct ioatdma_device *ioatdma_device; dma_addr_t phys; - ioatdma_device = to_ioatdma_device(ioat_chan->common.device); + ioatdma_device = ioat->base.device; desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); if (unlikely(!desc)) return NULL; @@ -561,8 +567,8 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat_chan, gfp_t flags) } memset(desc, 0, sizeof(*desc)); - dma_async_tx_descriptor_init(&desc_sw->txd, &ioat_chan->common); - switch (ioat_chan->device->version) { + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); + switch (ioatdma_device->version) { case IOAT_VER_1_2: desc_sw->txd.tx_submit = ioat1_tx_submit; break; @@ -585,26 +591,26 @@ MODULE_PARM_DESC(ioat_initial_desc_count, /** * ioat2_dma_massage_chan_desc - link the descriptors into a circle - * @ioat_chan: the channel to be massaged + * @ioat: the channel to be massaged */ -static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan) +static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat) { struct ioat_desc_sw *desc, *_desc; /* setup used_desc */ - ioat_chan->used_desc.next = ioat_chan->free_desc.next; - ioat_chan->used_desc.prev = NULL; + ioat->used_desc.next = ioat->free_desc.next; + ioat->used_desc.prev = NULL; /* pull free_desc out of the circle so that every node is a hw * descriptor, but leave it pointing to the list */ - ioat_chan->free_desc.prev->next = ioat_chan->free_desc.next; - ioat_chan->free_desc.next->prev = ioat_chan->free_desc.prev; + ioat->free_desc.prev->next = ioat->free_desc.next; + ioat->free_desc.next->prev = ioat->free_desc.prev; /* circle link the hw descriptors */ - desc = to_ioat_desc(ioat_chan->free_desc.next); + desc = to_ioat_desc(ioat->free_desc.next); desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; - list_for_each_entry_safe(desc, _desc, ioat_chan->free_desc.next, node) { + list_for_each_entry_safe(desc, _desc, ioat->free_desc.next, node) { desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; } } @@ -613,9 +619,10 @@ static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan) * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors * @chan: the channel to be filled out */ -static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) +static int ioat_dma_alloc_chan_resources(struct dma_chan *c) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *desc; u16 chanctrl; u32 chanerr; @@ -623,89 +630,87 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) LIST_HEAD(tmp_list); /* have we already been set up? */ - if (!list_empty(&ioat_chan->free_desc)) - return ioat_chan->desccount; + if (!list_empty(&ioat->free_desc)) + return ioat->desccount; /* Setup register to interrupt and write completion status on error */ chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | IOAT_CHANCTRL_ERR_COMPLETION_EN; - writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET); + writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); - chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); if (chanerr) { - dev_err(to_dev(ioat_chan), "CHANERR = %x, clearing\n", chanerr); - writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); } /* Allocate descriptors */ for (i = 0; i < ioat_initial_desc_count; i++) { - desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); + desc = ioat_dma_alloc_descriptor(ioat, GFP_KERNEL); if (!desc) { - dev_err(to_dev(ioat_chan), - "Only %d initial descriptors\n", i); + dev_err(to_dev(chan), "Only %d initial descriptors\n", i); break; } list_add_tail(&desc->node, &tmp_list); } - spin_lock_bh(&ioat_chan->desc_lock); - ioat_chan->desccount = i; - list_splice(&tmp_list, &ioat_chan->free_desc); - if (ioat_chan->device->version != IOAT_VER_1_2) - ioat2_dma_massage_chan_desc(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); + spin_lock_bh(&ioat->desc_lock); + ioat->desccount = i; + list_splice(&tmp_list, &ioat->free_desc); + if (chan->device->version != IOAT_VER_1_2) + ioat2_dma_massage_chan_desc(ioat); + spin_unlock_bh(&ioat->desc_lock); /* allocate a completion writeback area */ /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ - ioat_chan->completion_virt = - pci_pool_alloc(ioat_chan->device->completion_pool, - GFP_KERNEL, - &ioat_chan->completion_addr); - memset(ioat_chan->completion_virt, 0, - sizeof(*ioat_chan->completion_virt)); - writel(((u64) ioat_chan->completion_addr) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); - writel(((u64) ioat_chan->completion_addr) >> 32, - ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + chan->completion_virt = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, + &chan->completion_addr); + memset(chan->completion_virt, 0, + sizeof(*chan->completion_virt)); + writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_addr) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); - tasklet_enable(&ioat_chan->cleanup_task); - ioat_dma_start_null_desc(ioat_chan); /* give chain to dma device */ - return ioat_chan->desccount; + tasklet_enable(&chan->cleanup_task); + ioat_dma_start_null_desc(ioat); /* give chain to dma device */ + return ioat->desccount; } /** * ioat_dma_free_chan_resources - release all the descriptors * @chan: the channel to be cleaned */ -static void ioat_dma_free_chan_resources(struct dma_chan *chan) +static void ioat_dma_free_chan_resources(struct dma_chan *c) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioatdma_device *ioatdma_device = to_ioatdma_device(chan->device); + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; struct ioat_desc_sw *desc, *_desc; int in_use_descs = 0; /* Before freeing channel resources first check * if they have been previously allocated for this channel. */ - if (ioat_chan->desccount == 0) + if (ioat->desccount == 0) return; - tasklet_disable(&ioat_chan->cleanup_task); - ioat_dma_memcpy_cleanup(ioat_chan); + tasklet_disable(&chan->cleanup_task); + ioat_dma_memcpy_cleanup(ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce * before removing DMA descriptor resources. */ writeb(IOAT_CHANCMD_RESET, - ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); mdelay(100); - spin_lock_bh(&ioat_chan->desc_lock); - switch (ioat_chan->device->version) { + spin_lock_bh(&ioat->desc_lock); + switch (chan->device->version) { case IOAT_VER_1_2: list_for_each_entry_safe(desc, _desc, - &ioat_chan->used_desc, node) { + &ioat->used_desc, node) { in_use_descs++; list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, @@ -713,7 +718,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) kfree(desc); } list_for_each_entry_safe(desc, _desc, - &ioat_chan->free_desc, node) { + &ioat->free_desc, node) { list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, desc->txd.phys); @@ -723,62 +728,61 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) case IOAT_VER_2_0: case IOAT_VER_3_0: list_for_each_entry_safe(desc, _desc, - ioat_chan->free_desc.next, node) { + ioat->free_desc.next, node) { list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, desc->txd.phys); kfree(desc); } - desc = to_ioat_desc(ioat_chan->free_desc.next); + desc = to_ioat_desc(ioat->free_desc.next); pci_pool_free(ioatdma_device->dma_pool, desc->hw, desc->txd.phys); kfree(desc); - INIT_LIST_HEAD(&ioat_chan->free_desc); - INIT_LIST_HEAD(&ioat_chan->used_desc); + INIT_LIST_HEAD(&ioat->free_desc); + INIT_LIST_HEAD(&ioat->used_desc); break; } - spin_unlock_bh(&ioat_chan->desc_lock); + spin_unlock_bh(&ioat->desc_lock); pci_pool_free(ioatdma_device->completion_pool, - ioat_chan->completion_virt, - ioat_chan->completion_addr); + chan->completion_virt, + chan->completion_addr); /* one is ok since we left it on there on purpose */ if (in_use_descs > 1) - dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n", + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", in_use_descs - 1); - ioat_chan->last_completion = ioat_chan->completion_addr = 0; - ioat_chan->pending = 0; - ioat_chan->dmacount = 0; - ioat_chan->desccount = 0; - ioat_chan->watchdog_completion = 0; - ioat_chan->last_compl_desc_addr_hw = 0; - ioat_chan->watchdog_tcp_cookie = - ioat_chan->watchdog_last_tcp_cookie = 0; + chan->last_completion = chan->completion_addr = 0; + chan->watchdog_completion = 0; + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0; + ioat->pending = 0; + ioat->dmacount = 0; + ioat->desccount = 0; } /** - * ioat_dma_get_next_descriptor - return the next available descriptor - * @ioat_chan: IOAT DMA channel handle + * ioat1_dma_get_next_descriptor - return the next available descriptor + * @ioat: IOAT DMA channel handle * * Gets the next descriptor from the chain, and must be called with the * channel's desc_lock held. Allocates more descriptors if the channel * has run out. */ static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) +ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) { struct ioat_desc_sw *new; - if (!list_empty(&ioat_chan->free_desc)) { - new = to_ioat_desc(ioat_chan->free_desc.next); + if (!list_empty(&ioat->free_desc)) { + new = to_ioat_desc(ioat->free_desc.next); list_del(&new->node); } else { /* try to get another desc */ - new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); + new = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); if (!new) { - dev_err(to_dev(ioat_chan), "alloc failed\n"); + dev_err(to_dev(&ioat->base), "alloc failed\n"); return NULL; } } @@ -788,7 +792,7 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) } static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) +ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat) { struct ioat_desc_sw *new; @@ -801,15 +805,15 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) * linking in a new set of descriptors, since the device * has probably already read the pointer to it */ - if (ioat_chan->used_desc.prev && - ioat_chan->used_desc.next == ioat_chan->used_desc.prev->prev) { + if (ioat->used_desc.prev && + ioat->used_desc.next == ioat->used_desc.prev->prev) { struct ioat_desc_sw *desc; struct ioat_desc_sw *noop_desc; int i; /* set up the noop descriptor */ - noop_desc = to_ioat_desc(ioat_chan->used_desc.next); + noop_desc = to_ioat_desc(ioat->used_desc.next); /* set size to non-zero value (channel returns error when size is 0) */ noop_desc->hw->size = NULL_DESC_BUFFER_SIZE; noop_desc->hw->ctl = 0; @@ -817,60 +821,61 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) noop_desc->hw->src_addr = 0; noop_desc->hw->dst_addr = 0; - ioat_chan->used_desc.next = ioat_chan->used_desc.next->next; - ioat_chan->pending++; - ioat_chan->dmacount++; + ioat->used_desc.next = ioat->used_desc.next->next; + ioat->pending++; + ioat->dmacount++; /* try to get a few more descriptors */ for (i = 16; i; i--) { - desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); + desc = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); if (!desc) { - dev_err(to_dev(ioat_chan), "alloc failed\n"); + dev_err(to_dev(&ioat->base), + "alloc failed\n"); break; } - list_add_tail(&desc->node, ioat_chan->used_desc.next); + list_add_tail(&desc->node, ioat->used_desc.next); desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; to_ioat_desc(desc->node.prev)->hw->next = desc->txd.phys; - ioat_chan->desccount++; + ioat->desccount++; } - ioat_chan->used_desc.next = noop_desc->node.next; + ioat->used_desc.next = noop_desc->node.next; } - new = to_ioat_desc(ioat_chan->used_desc.next); + new = to_ioat_desc(ioat->used_desc.next); prefetch(new); - ioat_chan->used_desc.next = new->node.next; + ioat->used_desc.next = new->node.next; - if (ioat_chan->used_desc.prev == NULL) - ioat_chan->used_desc.prev = &new->node; + if (ioat->used_desc.prev == NULL) + ioat->used_desc.prev = &new->node; prefetch(new->hw); return new; } static struct ioat_desc_sw * -ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) +ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat) { - if (!ioat_chan) + if (!ioat) return NULL; - switch (ioat_chan->device->version) { + switch (ioat->base.device->version) { case IOAT_VER_1_2: - return ioat1_dma_get_next_descriptor(ioat_chan); + return ioat1_dma_get_next_descriptor(ioat); case IOAT_VER_2_0: case IOAT_VER_3_0: - return ioat2_dma_get_next_descriptor(ioat_chan); + return ioat2_dma_get_next_descriptor(ioat); } return NULL; } static struct dma_async_tx_descriptor * -ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, +ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_desc_sw *desc; size_t copy; LIST_HEAD(chain); @@ -880,14 +885,14 @@ ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, struct ioat_dma_descriptor *hw = NULL; int tx_cnt = 0; - spin_lock_bh(&ioat_chan->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat_chan); + spin_lock_bh(&ioat->desc_lock); + desc = ioat_dma_get_next_descriptor(ioat); do { if (!desc) break; tx_cnt++; - copy = min_t(size_t, len, ioat_chan->xfercap); + copy = min_t(size_t, len, ioat->xfercap); hw = desc->hw; hw->size = copy; @@ -904,7 +909,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, struct ioat_desc_sw *next; async_tx_ack(&desc->txd); - next = ioat_dma_get_next_descriptor(ioat_chan); + next = ioat_dma_get_next_descriptor(ioat); hw->next = next ? next->txd.phys : 0; desc = next; } else @@ -912,14 +917,16 @@ ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, } while (len); if (!desc) { - dev_err(to_dev(ioat_chan), + struct ioat_chan_common *chan = &ioat->base; + + dev_err(to_dev(chan), "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); - list_splice(&chain, &ioat_chan->free_desc); - spin_unlock_bh(&ioat_chan->desc_lock); + chan_num(chan), ioat->dmacount, ioat->desccount); + list_splice(&chain, &ioat->free_desc); + spin_unlock_bh(&ioat->desc_lock); return NULL; } - spin_unlock_bh(&ioat_chan->desc_lock); + spin_unlock_bh(&ioat->desc_lock); desc->txd.flags = flags; desc->tx_cnt = tx_cnt; @@ -934,17 +941,17 @@ ioat1_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, } static struct dma_async_tx_descriptor * -ioat2_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, +ioat2_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_desc_sw *new; - spin_lock_bh(&ioat_chan->desc_lock); - new = ioat2_dma_get_next_descriptor(ioat_chan); + spin_lock_bh(&ioat->desc_lock); + new = ioat2_dma_get_next_descriptor(ioat); /* - * leave ioat_chan->desc_lock set in ioat 2 path + * leave ioat->desc_lock set in ioat 2 path * it will get unlocked at end of tx_submit */ @@ -955,10 +962,12 @@ ioat2_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, new->txd.flags = flags; return &new->txd; } else { - spin_unlock_bh(&ioat_chan->desc_lock); - dev_err(to_dev(ioat_chan), + struct ioat_chan_common *chan = &ioat->base; + + spin_unlock_bh(&ioat->desc_lock); + dev_err(to_dev(chan), "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); + chan_num(chan), ioat->dmacount, ioat->desccount); return NULL; } } @@ -968,20 +977,20 @@ static void ioat_dma_cleanup_tasklet(unsigned long data) struct ioat_dma_chan *chan = (void *)data; ioat_dma_memcpy_cleanup(chan); writew(IOAT_CHANCTRL_INT_DISABLE, - chan->reg_base + IOAT_CHANCTRL_OFFSET); + chan->base.reg_base + IOAT_CHANCTRL_OFFSET); } static void -ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) +ioat_dma_unmap(struct ioat_chan_common *chan, struct ioat_desc_sw *desc) { if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE) - pci_unmap_single(ioat_chan->device->pdev, + pci_unmap_single(chan->device->pdev, pci_unmap_addr(desc, dst), pci_unmap_len(desc, len), PCI_DMA_FROMDEVICE); else - pci_unmap_page(ioat_chan->device->pdev, + pci_unmap_page(chan->device->pdev, pci_unmap_addr(desc, dst), pci_unmap_len(desc, len), PCI_DMA_FROMDEVICE); @@ -989,12 +998,12 @@ ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE) - pci_unmap_single(ioat_chan->device->pdev, + pci_unmap_single(chan->device->pdev, pci_unmap_addr(desc, src), pci_unmap_len(desc, len), PCI_DMA_TODEVICE); else - pci_unmap_page(ioat_chan->device->pdev, + pci_unmap_page(chan->device->pdev, pci_unmap_addr(desc, src), pci_unmap_len(desc, len), PCI_DMA_TODEVICE); @@ -1005,8 +1014,9 @@ ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) * ioat_dma_memcpy_cleanup - cleanup up finished descriptors * @chan: ioat channel to be cleaned up */ -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) +static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) { + struct ioat_chan_common *chan = &ioat->base; unsigned long phys_complete; struct ioat_desc_sw *desc, *_desc; dma_cookie_t cookie = 0; @@ -1014,9 +1024,9 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) struct ioat_desc_sw *latest_desc; struct dma_async_tx_descriptor *tx; - prefetch(ioat_chan->completion_virt); + prefetch(chan->completion_virt); - if (!spin_trylock_bh(&ioat_chan->cleanup_lock)) + if (!spin_trylock_bh(&chan->cleanup_lock)) return; /* The completion writeback can happen at any time, @@ -1026,49 +1036,47 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) #if (BITS_PER_LONG == 64) phys_complete = - ioat_chan->completion_virt->full + chan->completion_virt->full & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; #else - phys_complete = - ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; + phys_complete = chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; #endif - if ((ioat_chan->completion_virt->full + if ((chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { - dev_err(to_dev(ioat_chan), "Channel halted, chanerr = %x\n", - readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET)); + dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", + readl(chan->reg_base + IOAT_CHANERR_OFFSET)); /* TODO do something to salvage the situation */ } - if (phys_complete == ioat_chan->last_completion) { - spin_unlock_bh(&ioat_chan->cleanup_lock); + if (phys_complete == chan->last_completion) { + spin_unlock_bh(&chan->cleanup_lock); /* * perhaps we're stuck so hard that the watchdog can't go off? * try to catch it after 2 seconds */ - if (ioat_chan->device->version != IOAT_VER_3_0) { + if (chan->device->version != IOAT_VER_3_0) { if (time_after(jiffies, - ioat_chan->last_completion_time + HZ*WATCHDOG_DELAY)) { - ioat_dma_chan_watchdog(&(ioat_chan->device->work.work)); - ioat_chan->last_completion_time = jiffies; + chan->last_completion_time + HZ*WATCHDOG_DELAY)) { + ioat_dma_chan_watchdog(&(chan->device->work.work)); + chan->last_completion_time = jiffies; } } return; } - ioat_chan->last_completion_time = jiffies; + chan->last_completion_time = jiffies; cookie = 0; - if (!spin_trylock_bh(&ioat_chan->desc_lock)) { - spin_unlock_bh(&ioat_chan->cleanup_lock); + if (!spin_trylock_bh(&ioat->desc_lock)) { + spin_unlock_bh(&chan->cleanup_lock); return; } - switch (ioat_chan->device->version) { + switch (chan->device->version) { case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, - &ioat_chan->used_desc, node) { + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { tx = &desc->txd; /* * Incoming DMA requests may use multiple descriptors, @@ -1077,7 +1085,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) */ if (tx->cookie) { cookie = tx->cookie; - ioat_dma_unmap(ioat_chan, desc); + ioat_dma_unmap(chan, desc); if (tx->callback) { tx->callback(tx->callback_param); tx->callback = NULL; @@ -1091,7 +1099,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) */ if (async_tx_test_ack(tx)) { list_move_tail(&desc->node, - &ioat_chan->free_desc); + &ioat->free_desc); } else tx->cookie = 0; } else { @@ -1110,11 +1118,11 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) case IOAT_VER_2_0: case IOAT_VER_3_0: /* has some other thread has already cleaned up? */ - if (ioat_chan->used_desc.prev == NULL) + if (ioat->used_desc.prev == NULL) break; /* work backwards to find latest finished desc */ - desc = to_ioat_desc(ioat_chan->used_desc.next); + desc = to_ioat_desc(ioat->used_desc.next); tx = &desc->txd; latest_desc = NULL; do { @@ -1125,18 +1133,18 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) latest_desc = desc; break; } - } while (&desc->node != ioat_chan->used_desc.prev); + } while (&desc->node != ioat->used_desc.prev); if (latest_desc != NULL) { /* work forwards to clear finished descriptors */ - for (desc = to_ioat_desc(ioat_chan->used_desc.prev); + for (desc = to_ioat_desc(ioat->used_desc.prev); &desc->node != latest_desc->node.next && - &desc->node != ioat_chan->used_desc.next; + &desc->node != ioat->used_desc.next; desc = to_ioat_desc(desc->node.next)) { if (tx->cookie) { cookie = tx->cookie; tx->cookie = 0; - ioat_dma_unmap(ioat_chan, desc); + ioat_dma_unmap(chan, desc); if (tx->callback) { tx->callback(tx->callback_param); tx->callback = NULL; @@ -1145,21 +1153,21 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) } /* move used.prev up beyond those that are finished */ - if (&desc->node == ioat_chan->used_desc.next) - ioat_chan->used_desc.prev = NULL; + if (&desc->node == ioat->used_desc.next) + ioat->used_desc.prev = NULL; else - ioat_chan->used_desc.prev = &desc->node; + ioat->used_desc.prev = &desc->node; } break; } - spin_unlock_bh(&ioat_chan->desc_lock); + spin_unlock_bh(&ioat->desc_lock); - ioat_chan->last_completion = phys_complete; + chan->last_completion = phys_complete; if (cookie != 0) - ioat_chan->completed_cookie = cookie; + chan->completed_cookie = cookie; - spin_unlock_bh(&ioat_chan->cleanup_lock); + spin_unlock_bh(&chan->cleanup_lock); } /** @@ -1170,17 +1178,18 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) * @used: if not %NULL, updated with last used transaction */ static enum dma_status -ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie, +ioat_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used) { - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; dma_cookie_t last_used; dma_cookie_t last_complete; enum dma_status ret; - last_used = chan->cookie; - last_complete = ioat_chan->completed_cookie; - ioat_chan->watchdog_tcp_cookie = cookie; + last_used = c->cookie; + last_complete = chan->completed_cookie; + chan->watchdog_tcp_cookie = cookie; if (done) *done = last_complete; @@ -1191,10 +1200,10 @@ ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie, if (ret == DMA_SUCCESS) return ret; - ioat_dma_memcpy_cleanup(ioat_chan); + ioat_dma_memcpy_cleanup(ioat); - last_used = chan->cookie; - last_complete = ioat_chan->completed_cookie; + last_used = c->cookie; + last_complete = chan->completed_cookie; if (done) *done = last_complete; @@ -1204,19 +1213,20 @@ ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie, return dma_async_is_complete(cookie, last_complete, last_used); } -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) +static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) { + struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *desc; struct ioat_dma_descriptor *hw; - spin_lock_bh(&ioat_chan->desc_lock); + spin_lock_bh(&ioat->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat_chan); + desc = ioat_dma_get_next_descriptor(ioat); if (!desc) { - dev_err(to_dev(ioat_chan), + dev_err(to_dev(chan), "Unable to start null desc - get next desc failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); + spin_unlock_bh(&ioat->desc_lock); return; } @@ -1230,31 +1240,31 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) hw->src_addr = 0; hw->dst_addr = 0; async_tx_ack(&desc->txd); - switch (ioat_chan->device->version) { + switch (chan->device->version) { case IOAT_VER_1_2: hw->next = 0; - list_add_tail(&desc->node, &ioat_chan->used_desc); + list_add_tail(&desc->node, &ioat->used_desc); writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - writeb(IOAT_CHANCMD_START, ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); + writeb(IOAT_CHANCMD_START, chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); break; case IOAT_VER_2_0: case IOAT_VER_3_0: writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - ioat_chan->dmacount++; - __ioat2_dma_memcpy_issue_pending(ioat_chan); + ioat->dmacount++; + __ioat2_dma_memcpy_issue_pending(ioat); break; } - spin_unlock_bh(&ioat_chan->desc_lock); + spin_unlock_bh(&ioat->desc_lock); } /* @@ -1371,7 +1381,7 @@ MODULE_PARM_DESC(ioat_interrupt_style, */ static int ioat_dma_setup_interrupts(struct ioatdma_device *device) { - struct ioat_dma_chan *ioat_chan; + struct ioat_chan_common *chan; struct pci_dev *pdev = device->pdev; struct device *dev = &pdev->dev; struct msix_entry *msix; @@ -1404,15 +1414,15 @@ msix: for (i = 0; i < msixcnt; i++) { msix = &device->msix_entries[i]; - ioat_chan = ioat_chan_by_index(device, i); + chan = ioat_chan_by_index(device, i); err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt_msix, 0, - "ioat-msix", ioat_chan); + "ioat-msix", chan); if (err) { for (j = 0; j < i; j++) { msix = &device->msix_entries[j]; - ioat_chan = ioat_chan_by_index(device, j); - devm_free_irq(dev, msix->vector, ioat_chan); + chan = ioat_chan_by_index(device, j); + devm_free_irq(dev, msix->vector, chan); } goto msix_single_vector; } @@ -1594,8 +1604,8 @@ int ioat2_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; struct dma_device *dma; - struct dma_chan *chan; - struct ioat_dma_chan *ioat_chan; + struct dma_chan *c; + struct ioat_chan_common *chan; int err; dma = &device->common; @@ -1607,10 +1617,10 @@ int ioat2_dma_probe(struct ioatdma_device *device, int dca) return err; ioat_set_tcp_copy_break(2048); - list_for_each_entry(chan, &dma->channels, device_node) { - ioat_chan = to_ioat_chan(chan); + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); + chan->reg_base + IOAT_DCACTRL_OFFSET); } err = ioat_register(device); @@ -1629,8 +1639,8 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; struct dma_device *dma; - struct dma_chan *chan; - struct ioat_dma_chan *ioat_chan; + struct dma_chan *c; + struct ioat_chan_common *chan; int err; u16 dev_id; @@ -1656,10 +1666,10 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca) return err; ioat_set_tcp_copy_break(262144); - list_for_each_entry(chan, &dma->channels, device_node) { - ioat_chan = to_ioat_chan(chan); + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); writel(IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); + chan->reg_base + IOAT_DCACTRL_OFFSET); } err = ioat_register(device); @@ -1673,8 +1683,6 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca) void ioat_dma_remove(struct ioatdma_device *device) { - struct dma_chan *chan, *_chan; - struct ioat_dma_chan *ioat_chan; struct dma_device *dma = &device->common; if (device->version != IOAT_VER_3_0) @@ -1687,9 +1695,6 @@ void ioat_dma_remove(struct ioatdma_device *device) pci_pool_destroy(device->dma_pool); pci_pool_destroy(device->completion_pool); - list_for_each_entry_safe(chan, _chan, &dma->channels, device_node) { - ioat_chan = to_ioat_chan(chan); - list_del(&chan->device_node); - } + INIT_LIST_HEAD(&dma->channels); } diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 9f0c853b6a7..5b31db73ad8 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -35,7 +35,6 @@ #define IOAT_DMA_DCA_ANY_CPU ~0 #define IOAT_WATCHDOG_PERIOD (2 * HZ) -#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd) @@ -74,37 +73,24 @@ struct ioatdma_device { u8 version; struct delayed_work work; struct msix_entry msix_entries[4]; - struct ioat_dma_chan *idx[4]; + struct ioat_chan_common *idx[4]; struct dca_provider *dca; void (*intr_quirk)(struct ioatdma_device *device); }; -/** - * struct ioat_dma_chan - internal representation of a DMA channel - */ -struct ioat_dma_chan { - +struct ioat_chan_common { void __iomem *reg_base; - dma_cookie_t completed_cookie; unsigned long last_completion; unsigned long last_completion_time; - size_t xfercap; /* XFERCAP register value expanded out */ - spinlock_t cleanup_lock; - spinlock_t desc_lock; - struct list_head free_desc; - struct list_head used_desc; + dma_cookie_t completed_cookie; unsigned long watchdog_completion; int watchdog_tcp_cookie; u32 watchdog_last_tcp_cookie; struct delayed_work work; - int pending; - u16 dmacount; - u16 desccount; - struct ioatdma_device *device; struct dma_chan common; @@ -120,6 +106,35 @@ struct ioat_dma_chan { struct tasklet_struct cleanup_task; }; +/** + * struct ioat_dma_chan - internal representation of a DMA channel + */ +struct ioat_dma_chan { + struct ioat_chan_common base; + + size_t xfercap; /* XFERCAP register value expanded out */ + + spinlock_t desc_lock; + struct list_head free_desc; + struct list_head used_desc; + + int pending; + u16 dmacount; + u16 desccount; +}; + +static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c) +{ + return container_of(c, struct ioat_chan_common, common); +} + +static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat_dma_chan, base); +} + /* wrapper around hardware descriptor format + additional software fields */ /** From 5cbafa65b92ee4f5b8ba915cddf94b91f186b989 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 26 Aug 2009 13:01:44 -0700 Subject: [PATCH 39/91] ioat2,3: convert to a true ring buffer Replace the current linked list munged into a ring with a native ring buffer implementation. The benefit of this approach is reduced overhead as many parameters can be derived from ring position with simple pointer comparisons and descriptor allocation/freeing becomes just a manipulation of head/tail pointers. It requires a contiguous allocation for the software descriptor information. Since this arrangement is significantly different from the ioat1 chain, move ioat2,3 support into its own file and header. Common routines are exported from driver/dma/ioat/dma.[ch]. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/Makefile | 2 +- drivers/dma/ioat/dma.c | 886 +++++++++----------------------------- drivers/dma/ioat/dma.h | 50 ++- drivers/dma/ioat/dma_v2.c | 750 ++++++++++++++++++++++++++++++++ drivers/dma/ioat/dma_v2.h | 131 ++++++ drivers/dma/ioat/pci.c | 1 + 6 files changed, 1128 insertions(+), 692 deletions(-) create mode 100644 drivers/dma/ioat/dma_v2.c create mode 100644 drivers/dma/ioat/dma_v2.h diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile index 2ce3d3a4270..205a639e84d 100644 --- a/drivers/dma/ioat/Makefile +++ b/drivers/dma/ioat/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o -ioatdma-objs := pci.o dma.o dca.o +ioatdma-objs := pci.o dma.o dma_v2.o dca.o diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 2e81e0c76e6..64b4d75059a 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -38,28 +38,14 @@ #include "registers.h" #include "hw.h" -static int ioat_pending_level = 4; +int ioat_pending_level = 4; module_param(ioat_pending_level, int, 0644); MODULE_PARM_DESC(ioat_pending_level, "high-water mark for pushing ioat descriptors (default: 4)"); -static void ioat_dma_chan_reset_part2(struct work_struct *work); -static void ioat_dma_chan_watchdog(struct work_struct *work); - /* internal functions */ -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat); -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat); - -static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat); -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat); - -static inline struct ioat_chan_common * -ioat_chan_by_index(struct ioatdma_device *device, int index) -{ - return device->idx[index]; -} +static void ioat1_cleanup(struct ioat_dma_chan *ioat); +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat); /** * ioat_dma_do_interrupt - handler used for single vector interrupt mode @@ -108,18 +94,38 @@ static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) return IRQ_HANDLED; } -static void ioat_dma_cleanup_tasklet(unsigned long data); +static void ioat1_cleanup_tasklet(unsigned long data); + +/* common channel initialization */ +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + work_func_t work_fn, void (*tasklet)(unsigned long), + unsigned long tasklet_data) +{ + struct dma_device *dma = &device->common; + + chan->device = device; + chan->reg_base = device->reg_base + (0x80 * (idx + 1)); + INIT_DELAYED_WORK(&chan->work, work_fn); + spin_lock_init(&chan->cleanup_lock); + chan->common.device = dma; + list_add_tail(&chan->common.device_node, &dma->channels); + device->idx[idx] = chan; + tasklet_init(&chan->cleanup_task, tasklet, tasklet_data); + tasklet_disable(&chan->cleanup_task); +} + +static void ioat1_reset_part2(struct work_struct *work); /** - * ioat_dma_enumerate_channels - find and initialize the device's channels + * ioat1_dma_enumerate_channels - find and initialize the device's channels * @device: the device to be enumerated */ -static int ioat_dma_enumerate_channels(struct ioatdma_device *device) +static int ioat1_enumerate_channels(struct ioatdma_device *device) { u8 xfercap_scale; u32 xfercap; int i; - struct ioat_chan_common *chan; struct ioat_dma_chan *ioat; struct device *dev = &device->pdev->dev; struct dma_device *dma = &device->common; @@ -135,31 +141,20 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) #endif for (i = 0; i < dma->chancnt; i++) { ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); - if (!ioat) { - dma->chancnt = i; + if (!ioat) break; - } - chan = &ioat->base; - chan->device = device; - chan->reg_base = device->reg_base + (0x80 * (i + 1)); + ioat_init_channel(device, &ioat->base, i, + ioat1_reset_part2, + ioat1_cleanup_tasklet, + (unsigned long) ioat); ioat->xfercap = xfercap; - ioat->desccount = 0; - INIT_DELAYED_WORK(&chan->work, ioat_dma_chan_reset_part2); - spin_lock_init(&chan->cleanup_lock); spin_lock_init(&ioat->desc_lock); INIT_LIST_HEAD(&ioat->free_desc); INIT_LIST_HEAD(&ioat->used_desc); - /* This should be made common somewhere in dmaengine.c */ - chan->common.device = &device->common; - list_add_tail(&chan->common.device_node, &dma->channels); - device->idx[i] = chan; - tasklet_init(&chan->cleanup_task, - ioat_dma_cleanup_tasklet, - (unsigned long) ioat); - tasklet_disable(&chan->cleanup_task); } - return dma->chancnt; + dma->chancnt = i; + return i; } /** @@ -187,35 +182,16 @@ static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) } } -static inline void -__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) -{ - void __iomem *reg_base = ioat->base.reg_base; - - ioat->pending = 0; - writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); -} - -static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(chan); - - if (ioat->pending > 0) { - spin_lock_bh(&ioat->desc_lock); - __ioat2_dma_memcpy_issue_pending(ioat); - spin_unlock_bh(&ioat->desc_lock); - } -} - - /** - * ioat_dma_chan_reset_part2 - reinit the channel after a reset + * ioat1_reset_part2 - reinit the channel after a reset */ -static void ioat_dma_chan_reset_part2(struct work_struct *work) +static void ioat1_reset_part2(struct work_struct *work) { struct ioat_chan_common *chan; struct ioat_dma_chan *ioat; struct ioat_desc_sw *desc; + int dmacount; + bool start_null = false; chan = container_of(work, struct ioat_chan_common, work.work); ioat = container_of(chan, struct ioat_dma_chan, base); @@ -226,26 +202,22 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) chan->completion_virt->high = 0; ioat->pending = 0; - /* - * count the descriptors waiting, and be sure to do it - * right for both the CB1 line and the CB2 ring - */ - ioat->dmacount = 0; + /* count the descriptors waiting */ + dmacount = 0; if (ioat->used_desc.prev) { desc = to_ioat_desc(ioat->used_desc.prev); do { - ioat->dmacount++; + dmacount++; desc = to_ioat_desc(desc->node.next); } while (&desc->node != ioat->used_desc.next); } - /* - * write the new starting descriptor address - * this puts channel engine into ARMED state - */ - desc = to_ioat_desc(ioat->used_desc.prev); - switch (chan->device->version) { - case IOAT_VER_1_2: + if (dmacount) { + /* + * write the new starting descriptor address + * this puts channel engine into ARMED state + */ + desc = to_ioat_desc(ioat->used_desc.prev); writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, @@ -253,32 +225,24 @@ static void ioat_dma_chan_reset_part2(struct work_struct *work) writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); - break; - case IOAT_VER_2_0: - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - - /* tell the engine to go with what's left to be done */ - writew(ioat->dmacount, - chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); - - break; - } - dev_err(to_dev(chan), - "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); - + } else + start_null = true; spin_unlock_bh(&ioat->desc_lock); spin_unlock_bh(&chan->cleanup_lock); + + dev_err(to_dev(chan), + "chan%d reset - %d descs waiting, %d total desc\n", + chan_num(chan), dmacount, ioat->desccount); + + if (start_null) + ioat1_dma_start_null_desc(ioat); } /** - * ioat_dma_reset_channel - restart a channel + * ioat1_reset_channel - restart a channel * @ioat: IOAT DMA channel handle */ -static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat) +static void ioat1_reset_channel(struct ioat_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; void __iomem *reg_base = chan->reg_base; @@ -316,9 +280,9 @@ static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat) } /** - * ioat_dma_chan_watchdog - watch for stuck channels + * ioat1_chan_watchdog - watch for stuck channels */ -static void ioat_dma_chan_watchdog(struct work_struct *work) +static void ioat1_chan_watchdog(struct work_struct *work) { struct ioatdma_device *device = container_of(work, struct ioatdma_device, work.work); @@ -339,16 +303,15 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) chan = ioat_chan_by_index(device, i); ioat = container_of(chan, struct ioat_dma_chan, base); - if (chan->device->version == IOAT_VER_1_2 - /* have we started processing anything yet */ - && chan->last_completion - /* have we completed any since last watchdog cycle? */ + if (/* have we started processing anything yet */ + chan->last_completion + /* have we completed any since last watchdog cycle? */ && (chan->last_completion == chan->watchdog_completion) - /* has TCP stuck on one cookie since last watchdog? */ + /* has TCP stuck on one cookie since last watchdog? */ && (chan->watchdog_tcp_cookie == chan->watchdog_last_tcp_cookie) && (chan->watchdog_tcp_cookie != chan->completed_cookie) - /* is there something in the chain to be processed? */ - /* CB1 chain always has at least the last one processed */ + /* is there something in the chain to be processed? */ + /* CB1 chain always has at least the last one processed */ && (ioat->used_desc.prev != ioat->used_desc.next) && ioat->pending == 0) { @@ -387,34 +350,15 @@ static void ioat_dma_chan_watchdog(struct work_struct *work) chan->completion_virt->low = completion_hw.low; chan->completion_virt->high = completion_hw.high; } else { - ioat_dma_reset_channel(ioat); + ioat1_reset_channel(ioat); chan->watchdog_completion = 0; chan->last_compl_desc_addr_hw = 0; } - - /* - * for version 2.0 if there are descriptors yet to be processed - * and the last completed hasn't changed since the last watchdog - * if they haven't hit the pending level - * issue the pending to push them through - * else - * try resetting the channel - */ - } else if (chan->device->version == IOAT_VER_2_0 - && ioat->used_desc.prev - && chan->last_completion - && chan->last_completion == chan->watchdog_completion) { - - if (ioat->pending < ioat_pending_level) - ioat2_dma_memcpy_issue_pending(&chan->common); - else { - ioat_dma_reset_channel(ioat); - chan->watchdog_completion = 0; - } } else { chan->last_compl_desc_addr_hw = 0; chan->watchdog_completion = chan->last_completion; } + chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; } @@ -447,7 +391,6 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) chain_tail->hw->next = first->txd.phys; list_splice_tail_init(&tx->tx_list, &ioat->used_desc); - ioat->dmacount += desc->tx_cnt; ioat->pending += desc->tx_cnt; if (ioat->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat); @@ -456,92 +399,6 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) return cookie; } -static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(tx->chan); - struct ioat_desc_sw *first = tx_to_ioat_desc(tx); - struct ioat_desc_sw *new; - struct ioat_dma_descriptor *hw; - dma_cookie_t cookie; - u32 copy; - size_t len; - dma_addr_t src, dst; - unsigned long orig_flags; - unsigned int desc_count = 0; - - /* src and dest and len are stored in the initial descriptor */ - len = first->len; - src = first->src; - dst = first->dst; - orig_flags = first->txd.flags; - new = first; - - /* - * ioat->desc_lock is still in force in version 2 path - * it gets unlocked at end of this function - */ - do { - copy = min_t(size_t, len, ioat->xfercap); - - async_tx_ack(&new->txd); - - hw = new->hw; - hw->size = copy; - hw->ctl = 0; - hw->src_addr = src; - hw->dst_addr = dst; - - len -= copy; - dst += copy; - src += copy; - desc_count++; - } while (len && (new = ioat2_dma_get_next_descriptor(ioat))); - - if (!new) { - dev_err(to_dev(&ioat->base), "tx submit failed\n"); - spin_unlock_bh(&ioat->desc_lock); - return -ENOMEM; - } - - hw->ctl_f.compl_write = 1; - if (first->txd.callback) { - hw->ctl_f.int_en = 1; - if (first != new) { - /* move callback into to last desc */ - new->txd.callback = first->txd.callback; - new->txd.callback_param - = first->txd.callback_param; - first->txd.callback = NULL; - first->txd.callback_param = NULL; - } - } - - new->tx_cnt = desc_count; - new->txd.flags = orig_flags; /* client is in control of this ack */ - - /* store the original values for use in later cleanup */ - if (new != first) { - new->src = first->src; - new->dst = first->dst; - new->len = first->len; - } - - /* cookie incr and addition to used_list must be atomic */ - cookie = ioat->base.common.cookie; - cookie++; - if (cookie < 0) - cookie = 1; - ioat->base.common.cookie = new->txd.cookie = cookie; - - ioat->dmacount += desc_count; - ioat->pending += desc_count; - if (ioat->pending >= ioat_pending_level) - __ioat2_dma_memcpy_issue_pending(ioat); - spin_unlock_bh(&ioat->desc_lock); - - return cookie; -} - /** * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair * @ioat: the channel supplying the memory pool for the descriptors @@ -567,17 +424,9 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) } memset(desc, 0, sizeof(*desc)); - dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); - switch (ioatdma_device->version) { - case IOAT_VER_1_2: - desc_sw->txd.tx_submit = ioat1_tx_submit; - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - desc_sw->txd.tx_submit = ioat2_tx_submit; - break; - } + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); + desc_sw->txd.tx_submit = ioat1_tx_submit; desc_sw->hw = desc; desc_sw->txd.phys = phys; @@ -587,39 +436,12 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) static int ioat_initial_desc_count = 256; module_param(ioat_initial_desc_count, int, 0644); MODULE_PARM_DESC(ioat_initial_desc_count, - "initial descriptors per channel (default: 256)"); - + "ioat1: initial descriptors per channel (default: 256)"); /** - * ioat2_dma_massage_chan_desc - link the descriptors into a circle - * @ioat: the channel to be massaged - */ -static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat) -{ - struct ioat_desc_sw *desc, *_desc; - - /* setup used_desc */ - ioat->used_desc.next = ioat->free_desc.next; - ioat->used_desc.prev = NULL; - - /* pull free_desc out of the circle so that every node is a hw - * descriptor, but leave it pointing to the list - */ - ioat->free_desc.prev->next = ioat->free_desc.next; - ioat->free_desc.next->prev = ioat->free_desc.prev; - - /* circle link the hw descriptors */ - desc = to_ioat_desc(ioat->free_desc.next); - desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; - list_for_each_entry_safe(desc, _desc, ioat->free_desc.next, node) { - desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys; - } -} - -/** - * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors + * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors * @chan: the channel to be filled out */ -static int ioat_dma_alloc_chan_resources(struct dma_chan *c) +static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) { struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_chan_common *chan = &ioat->base; @@ -657,8 +479,6 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *c) spin_lock_bh(&ioat->desc_lock); ioat->desccount = i; list_splice(&tmp_list, &ioat->free_desc); - if (chan->device->version != IOAT_VER_1_2) - ioat2_dma_massage_chan_desc(ioat); spin_unlock_bh(&ioat->desc_lock); /* allocate a completion writeback area */ @@ -674,15 +494,15 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *c) chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); tasklet_enable(&chan->cleanup_task); - ioat_dma_start_null_desc(ioat); /* give chain to dma device */ + ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ return ioat->desccount; } /** - * ioat_dma_free_chan_resources - release all the descriptors + * ioat1_dma_free_chan_resources - release all the descriptors * @chan: the channel to be cleaned */ -static void ioat_dma_free_chan_resources(struct dma_chan *c) +static void ioat1_dma_free_chan_resources(struct dma_chan *c) { struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_chan_common *chan = &ioat->base; @@ -697,7 +517,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) return; tasklet_disable(&chan->cleanup_task); - ioat_dma_memcpy_cleanup(ioat); + ioat1_cleanup(ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce * before removing DMA descriptor resources. @@ -707,40 +527,20 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) mdelay(100); spin_lock_bh(&ioat->desc_lock); - switch (chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, - &ioat->used_desc, node) { - in_use_descs++; - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - list_for_each_entry_safe(desc, _desc, - &ioat->free_desc, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - list_for_each_entry_safe(desc, _desc, - ioat->free_desc.next, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->txd.phys); - kfree(desc); - } - desc = to_ioat_desc(ioat->free_desc.next); + list_for_each_entry_safe(desc, _desc, + &ioat->used_desc, node) { + in_use_descs++; + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + list_for_each_entry_safe(desc, _desc, + &ioat->free_desc, node) { + list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, desc->txd.phys); kfree(desc); - INIT_LIST_HEAD(&ioat->free_desc); - INIT_LIST_HEAD(&ioat->used_desc); - break; } spin_unlock_bh(&ioat->desc_lock); @@ -758,7 +558,6 @@ static void ioat_dma_free_chan_resources(struct dma_chan *c) chan->last_compl_desc_addr_hw = 0; chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0; ioat->pending = 0; - ioat->dmacount = 0; ioat->desccount = 0; } @@ -791,86 +590,6 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) return new; } -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat) -{ - struct ioat_desc_sw *new; - - /* - * used.prev points to where to start processing - * used.next points to next free descriptor - * if used.prev == NULL, there are none waiting to be processed - * if used.next == used.prev.prev, there is only one free descriptor, - * and we need to use it to as a noop descriptor before - * linking in a new set of descriptors, since the device - * has probably already read the pointer to it - */ - if (ioat->used_desc.prev && - ioat->used_desc.next == ioat->used_desc.prev->prev) { - - struct ioat_desc_sw *desc; - struct ioat_desc_sw *noop_desc; - int i; - - /* set up the noop descriptor */ - noop_desc = to_ioat_desc(ioat->used_desc.next); - /* set size to non-zero value (channel returns error when size is 0) */ - noop_desc->hw->size = NULL_DESC_BUFFER_SIZE; - noop_desc->hw->ctl = 0; - noop_desc->hw->ctl_f.null = 1; - noop_desc->hw->src_addr = 0; - noop_desc->hw->dst_addr = 0; - - ioat->used_desc.next = ioat->used_desc.next->next; - ioat->pending++; - ioat->dmacount++; - - /* try to get a few more descriptors */ - for (i = 16; i; i--) { - desc = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); - if (!desc) { - dev_err(to_dev(&ioat->base), - "alloc failed\n"); - break; - } - list_add_tail(&desc->node, ioat->used_desc.next); - - desc->hw->next - = to_ioat_desc(desc->node.next)->txd.phys; - to_ioat_desc(desc->node.prev)->hw->next - = desc->txd.phys; - ioat->desccount++; - } - - ioat->used_desc.next = noop_desc->node.next; - } - new = to_ioat_desc(ioat->used_desc.next); - prefetch(new); - ioat->used_desc.next = new->node.next; - - if (ioat->used_desc.prev == NULL) - ioat->used_desc.prev = &new->node; - - prefetch(new->hw); - return new; -} - -static struct ioat_desc_sw * -ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat) -{ - if (!ioat) - return NULL; - - switch (ioat->base.device->version) { - case IOAT_VER_1_2: - return ioat1_dma_get_next_descriptor(ioat); - case IOAT_VER_2_0: - case IOAT_VER_3_0: - return ioat2_dma_get_next_descriptor(ioat); - } - return NULL; -} - static struct dma_async_tx_descriptor * ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) @@ -886,7 +605,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, int tx_cnt = 0; spin_lock_bh(&ioat->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat); + desc = ioat1_dma_get_next_descriptor(ioat); do { if (!desc) break; @@ -909,7 +628,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, struct ioat_desc_sw *next; async_tx_ack(&desc->txd); - next = ioat_dma_get_next_descriptor(ioat); + next = ioat1_dma_get_next_descriptor(ioat); hw->next = next ? next->txd.phys : 0; desc = next; } else @@ -920,8 +639,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, struct ioat_chan_common *chan = &ioat->base; dev_err(to_dev(chan), - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); + "chan%d - get_next_desc failed\n", chan_num(chan)); list_splice(&chain, &ioat->free_desc); spin_unlock_bh(&ioat->desc_lock); return NULL; @@ -940,94 +658,43 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, return &desc->txd; } -static struct dma_async_tx_descriptor * -ioat2_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, - dma_addr_t dma_src, size_t len, unsigned long flags) -{ - struct ioat_dma_chan *ioat = to_ioat_chan(c); - struct ioat_desc_sw *new; - - spin_lock_bh(&ioat->desc_lock); - new = ioat2_dma_get_next_descriptor(ioat); - - /* - * leave ioat->desc_lock set in ioat 2 path - * it will get unlocked at end of tx_submit - */ - - if (new) { - new->len = len; - new->dst = dma_dest; - new->src = dma_src; - new->txd.flags = flags; - return &new->txd; - } else { - struct ioat_chan_common *chan = &ioat->base; - - spin_unlock_bh(&ioat->desc_lock); - dev_err(to_dev(chan), - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, ioat->desccount); - return NULL; - } -} - -static void ioat_dma_cleanup_tasklet(unsigned long data) +static void ioat1_cleanup_tasklet(unsigned long data) { struct ioat_dma_chan *chan = (void *)data; - ioat_dma_memcpy_cleanup(chan); + ioat1_cleanup(chan); writew(IOAT_CHANCTRL_INT_DISABLE, chan->base.reg_base + IOAT_CHANCTRL_OFFSET); } -static void -ioat_dma_unmap(struct ioat_chan_common *chan, struct ioat_desc_sw *desc) +static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, + int direction, enum dma_ctrl_flags flags, bool dst) { - if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE) - pci_unmap_single(chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - else - pci_unmap_page(chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - } - - if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE) - pci_unmap_single(chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - else - pci_unmap_page(chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - } + if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || + (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) + pci_unmap_single(pdev, addr, len, direction); + else + pci_unmap_page(pdev, addr, len, direction); } -/** - * ioat_dma_memcpy_cleanup - cleanup up finished descriptors - * @chan: ioat channel to be cleaned up - */ -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) + +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw) +{ + struct pci_dev *pdev = chan->device->pdev; + size_t offset = len - hw->size; + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) + ioat_unmap(pdev, hw->dst_addr - offset, len, + PCI_DMA_FROMDEVICE, flags, 1); + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) + ioat_unmap(pdev, hw->src_addr - offset, len, + PCI_DMA_TODEVICE, flags, 0); +} + +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) { - struct ioat_chan_common *chan = &ioat->base; unsigned long phys_complete; - struct ioat_desc_sw *desc, *_desc; - dma_cookie_t cookie = 0; - unsigned long desc_phys; - struct ioat_desc_sw *latest_desc; - struct dma_async_tx_descriptor *tx; - - prefetch(chan->completion_virt); - - if (!spin_trylock_bh(&chan->cleanup_lock)) - return; /* The completion writeback can happen at any time, so reads by the driver need to be atomic operations @@ -1051,18 +718,37 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) /* TODO do something to salvage the situation */ } + return phys_complete; +} + +/** + * ioat1_cleanup - cleanup up finished descriptors + * @chan: ioat channel to be cleaned up + */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + struct ioat_desc_sw *desc, *_desc; + dma_cookie_t cookie = 0; + struct dma_async_tx_descriptor *tx; + + prefetch(chan->completion_virt); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + phys_complete = ioat_get_current_completion(chan); if (phys_complete == chan->last_completion) { spin_unlock_bh(&chan->cleanup_lock); /* * perhaps we're stuck so hard that the watchdog can't go off? * try to catch it after 2 seconds */ - if (chan->device->version != IOAT_VER_3_0) { - if (time_after(jiffies, - chan->last_completion_time + HZ*WATCHDOG_DELAY)) { - ioat_dma_chan_watchdog(&(chan->device->work.work)); - chan->last_completion_time = jiffies; - } + if (time_after(jiffies, + chan->last_completion_time + HZ*WATCHDOG_DELAY)) { + ioat1_chan_watchdog(&(chan->device->work.work)); + chan->last_completion_time = jiffies; } return; } @@ -1074,91 +760,42 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) return; } - switch (chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { - tx = &desc->txd; - /* - * Incoming DMA requests may use multiple descriptors, - * due to exceeding xfercap, perhaps. If so, only the - * last one will have a cookie, and require unmapping. - */ - if (tx->cookie) { - cookie = tx->cookie; - ioat_dma_unmap(chan, desc); - if (tx->callback) { - tx->callback(tx->callback_param); - tx->callback = NULL; - } - } - - if (tx->phys != phys_complete) { - /* - * a completed entry, but not the last, so clean - * up if the client is done with the descriptor - */ - if (async_tx_test_ack(tx)) { - list_move_tail(&desc->node, - &ioat->free_desc); - } else - tx->cookie = 0; - } else { - /* - * last used desc. Do not remove, so we can - * append from it, but don't look at it next - * time, either - */ - tx->cookie = 0; - - /* TODO check status bits? */ - break; - } - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - /* has some other thread has already cleaned up? */ - if (ioat->used_desc.prev == NULL) - break; - - /* work backwards to find latest finished desc */ - desc = to_ioat_desc(ioat->used_desc.next); + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { tx = &desc->txd; - latest_desc = NULL; - do { - desc = to_ioat_desc(desc->node.prev); - desc_phys = (unsigned long)tx->phys - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; - if (desc_phys == phys_complete) { - latest_desc = desc; - break; + /* + * Incoming DMA requests may use multiple descriptors, + * due to exceeding xfercap, perhaps. If so, only the + * last one will have a cookie, and require unmapping. + */ + if (tx->cookie) { + cookie = tx->cookie; + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; } - } while (&desc->node != ioat->used_desc.prev); - - if (latest_desc != NULL) { - /* work forwards to clear finished descriptors */ - for (desc = to_ioat_desc(ioat->used_desc.prev); - &desc->node != latest_desc->node.next && - &desc->node != ioat->used_desc.next; - desc = to_ioat_desc(desc->node.next)) { - if (tx->cookie) { - cookie = tx->cookie; - tx->cookie = 0; - ioat_dma_unmap(chan, desc); - if (tx->callback) { - tx->callback(tx->callback_param); - tx->callback = NULL; - } - } - } - - /* move used.prev up beyond those that are finished */ - if (&desc->node == ioat->used_desc.next) - ioat->used_desc.prev = NULL; - else - ioat->used_desc.prev = &desc->node; } - break; + + if (tx->phys != phys_complete) { + /* + * a completed entry, but not the last, so clean + * up if the client is done with the descriptor + */ + if (async_tx_test_ack(tx)) + list_move_tail(&desc->node, &ioat->free_desc); + else + tx->cookie = 0; + } else { + /* + * last used desc. Do not remove, so we can + * append from it, but don't look at it next + * time, either + */ + tx->cookie = 0; + + /* TODO check status bits? */ + break; + } } spin_unlock_bh(&ioat->desc_lock); @@ -1170,50 +807,21 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat) spin_unlock_bh(&chan->cleanup_lock); } -/** - * ioat_dma_is_complete - poll the status of a IOAT DMA transaction - * @chan: IOAT DMA channel handle - * @cookie: DMA transaction identifier - * @done: if not %NULL, updated with last completed transaction - * @used: if not %NULL, updated with last used transaction - */ static enum dma_status -ioat_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, - dma_cookie_t *done, dma_cookie_t *used) +ioat1_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) { struct ioat_dma_chan *ioat = to_ioat_chan(c); - struct ioat_chan_common *chan = &ioat->base; - dma_cookie_t last_used; - dma_cookie_t last_complete; - enum dma_status ret; - last_used = c->cookie; - last_complete = chan->completed_cookie; - chan->watchdog_tcp_cookie = cookie; + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; - if (done) - *done = last_complete; - if (used) - *used = last_used; + ioat1_cleanup(ioat); - ret = dma_async_is_complete(cookie, last_complete, last_used); - if (ret == DMA_SUCCESS) - return ret; - - ioat_dma_memcpy_cleanup(ioat); - - last_used = c->cookie; - last_complete = chan->completed_cookie; - - if (done) - *done = last_complete; - if (used) - *used = last_used; - - return dma_async_is_complete(cookie, last_complete, last_used); + return ioat_is_complete(c, cookie, done, used); } -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *desc; @@ -1221,7 +829,7 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) spin_lock_bh(&ioat->desc_lock); - desc = ioat_dma_get_next_descriptor(ioat); + desc = ioat1_dma_get_next_descriptor(ioat); if (!desc) { dev_err(to_dev(chan), @@ -1240,30 +848,16 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat) hw->src_addr = 0; hw->dst_addr = 0; async_tx_ack(&desc->txd); - switch (chan->device->version) { - case IOAT_VER_1_2: - hw->next = 0; - list_add_tail(&desc->node, &ioat->used_desc); + hw->next = 0; + list_add_tail(&desc->node, &ioat->used_desc); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - writeb(IOAT_CHANCMD_START, chan->reg_base - + IOAT_CHANCMD_OFFSET(chan->device->version)); - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - - ioat->dmacount++; - __ioat2_dma_memcpy_issue_pending(ioat); - break; - } + writeb(IOAT_CHANCMD_START, chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); spin_unlock_bh(&ioat->desc_lock); } @@ -1484,7 +1078,7 @@ static void ioat_disable_interrupts(struct ioatdma_device *device) writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); } -static int ioat_probe(struct ioatdma_device *device) +int ioat_probe(struct ioatdma_device *device) { int err = -ENODEV; struct dma_device *dma = &device->common; @@ -1503,17 +1097,15 @@ static int ioat_probe(struct ioatdma_device *device) device->completion_pool = pci_pool_create("completion_pool", pdev, sizeof(u64), SMP_CACHE_BYTES, SMP_CACHE_BYTES); + if (!device->completion_pool) { err = -ENOMEM; goto err_completion_pool; } - ioat_dma_enumerate_channels(device); + device->enumerate_channels(device); dma_cap_set(DMA_MEMCPY, dma->cap_mask); - dma->device_alloc_chan_resources = ioat_dma_alloc_chan_resources; - dma->device_free_chan_resources = ioat_dma_free_chan_resources; - dma->device_is_tx_complete = ioat_dma_is_complete; dma->dev = &pdev->dev; dev_err(dev, "Intel(R) I/OAT DMA Engine found," @@ -1546,7 +1138,7 @@ err_dma_pool: return err; } -static int ioat_register(struct ioatdma_device *device) +int ioat_register(struct ioatdma_device *device) { int err = dma_async_device_register(&device->common); @@ -1580,9 +1172,13 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca) int err; device->intr_quirk = ioat1_intr_quirk; + device->enumerate_channels = ioat1_enumerate_channels; dma = &device->common; dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; + dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources; + dma->device_free_chan_resources = ioat1_dma_free_chan_resources; + dma->device_is_tx_complete = ioat1_dma_is_complete; err = ioat_probe(device); if (err) @@ -1594,93 +1190,12 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca) if (dca) device->dca = ioat_dca_init(pdev, device->reg_base); - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); + INIT_DELAYED_WORK(&device->work, ioat1_chan_watchdog); schedule_delayed_work(&device->work, WATCHDOG_DELAY); return err; } -int ioat2_dma_probe(struct ioatdma_device *device, int dca) -{ - struct pci_dev *pdev = device->pdev; - struct dma_device *dma; - struct dma_chan *c; - struct ioat_chan_common *chan; - int err; - - dma = &device->common; - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; - - err = ioat_probe(device); - if (err) - return err; - ioat_set_tcp_copy_break(2048); - - list_for_each_entry(c, &dma->channels, device_node) { - chan = to_chan_common(c); - writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, - chan->reg_base + IOAT_DCACTRL_OFFSET); - } - - err = ioat_register(device); - if (err) - return err; - if (dca) - device->dca = ioat2_dca_init(pdev, device->reg_base); - - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); - schedule_delayed_work(&device->work, WATCHDOG_DELAY); - - return err; -} - -int ioat3_dma_probe(struct ioatdma_device *device, int dca) -{ - struct pci_dev *pdev = device->pdev; - struct dma_device *dma; - struct dma_chan *c; - struct ioat_chan_common *chan; - int err; - u16 dev_id; - - dma = &device->common; - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - dma->device_issue_pending = ioat2_dma_memcpy_issue_pending; - - /* -= IOAT ver.3 workarounds =- */ - /* Write CHANERRMSK_INT with 3E07h to mask out the errors - * that can cause stability issues for IOAT ver.3 - */ - pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); - - /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit - * (workaround for spurious config parity error after restart) - */ - pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); - if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) - pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); - - err = ioat_probe(device); - if (err) - return err; - ioat_set_tcp_copy_break(262144); - - list_for_each_entry(c, &dma->channels, device_node) { - chan = to_chan_common(c); - writel(IOAT_DMA_DCA_ANY_CPU, - chan->reg_base + IOAT_DCACTRL_OFFSET); - } - - err = ioat_register(device); - if (err) - return err; - if (dca) - device->dca = ioat3_dca_init(pdev, device->reg_base); - - return err; -} - void ioat_dma_remove(struct ioatdma_device *device) { struct dma_device *dma = &device->common; @@ -1697,4 +1212,3 @@ void ioat_dma_remove(struct ioatdma_device *device) INIT_LIST_HEAD(&dma->channels); } - diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 5b31db73ad8..84065dfa4d4 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -62,6 +62,7 @@ * @idx: per channel data * @dca: direct cache access context * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) + * @enumerate_channels: hw version specific channel enumeration */ struct ioatdma_device { @@ -76,6 +77,7 @@ struct ioatdma_device { struct ioat_chan_common *idx[4]; struct dca_provider *dca; void (*intr_quirk)(struct ioatdma_device *device); + int (*enumerate_channels)(struct ioatdma_device *device); }; struct ioat_chan_common { @@ -106,6 +108,7 @@ struct ioat_chan_common { struct tasklet_struct cleanup_task; }; + /** * struct ioat_dma_chan - internal representation of a DMA channel */ @@ -119,7 +122,6 @@ struct ioat_dma_chan { struct list_head used_desc; int pending; - u16 dmacount; u16 desccount; }; @@ -135,6 +137,33 @@ static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) return container_of(chan, struct ioat_dma_chan, base); } +/** + * ioat_is_complete - poll the status of an ioat transaction + * @c: channel handle + * @cookie: transaction identifier + * @done: if set, updated with last completed transaction + * @used: if set, updated with last used transaction + */ +static inline enum dma_status +ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat_chan_common *chan = to_chan_common(c); + dma_cookie_t last_used; + dma_cookie_t last_complete; + + last_used = c->cookie; + last_complete = chan->completed_cookie; + chan->watchdog_tcp_cookie = cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + /* wrapper around hardware descriptor format + additional software fields */ /** @@ -162,11 +191,22 @@ static inline void ioat_set_tcp_copy_break(unsigned long copybreak) #endif } +static inline struct ioat_chan_common * +ioat_chan_by_index(struct ioatdma_device *device, int index) +{ + return device->idx[index]; +} + +int ioat_probe(struct ioatdma_device *device); +int ioat_register(struct ioatdma_device *device); int ioat1_dma_probe(struct ioatdma_device *dev, int dca); -int ioat2_dma_probe(struct ioatdma_device *dev, int dca); -int ioat3_dma_probe(struct ioatdma_device *dev, int dca); void ioat_dma_remove(struct ioatdma_device *device); struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan); +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + work_func_t work_fn, void (*tasklet)(unsigned long), + unsigned long tasklet_data); +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw); #endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c new file mode 100644 index 00000000000..49ba1c73d95 --- /dev/null +++ b/drivers/dma/ioat/dma_v2.c @@ -0,0 +1,750 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine (versions >= 2), which + * does asynchronous data movement and checksumming operations. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" + +static int ioat_ring_alloc_order = 8; +module_param(ioat_ring_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_alloc_order, + "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); + +static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) +{ + void * __iomem reg_base = ioat->base.reg_base; + + ioat->pending = 0; + ioat->dmacount += ioat2_ring_pending(ioat); + ioat->issued = ioat->head; + /* make descriptor updates globally visible before notifying channel */ + wmb(); + writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + +} + +static void ioat2_issue_pending(struct dma_chan *chan) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(chan); + + spin_lock_bh(&ioat->ring_lock); + if (ioat->pending == 1) + __ioat2_issue_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +/** + * ioat2_update_pending - log pending descriptors + * @ioat: ioat2+ channel + * + * set pending to '1' unless pending is already set to '2', pending == 2 + * indicates that submission is temporarily blocked due to an in-flight + * reset. If we are already above the ioat_pending_level threshold then + * just issue pending. + * + * called with ring_lock held + */ +static void ioat2_update_pending(struct ioat2_dma_chan *ioat) +{ + if (unlikely(ioat->pending == 2)) + return; + else if (ioat2_ring_pending(ioat) > ioat_pending_level) + __ioat2_issue_pending(ioat); + else + ioat->pending = 1; +} + +static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + void __iomem *reg_base = ioat->base.reg_base; + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + int idx; + + if (ioat2_ring_space(ioat) < 1) { + dev_err(to_dev(&ioat->base), + "Unable to start null desc - ring full\n"); + return; + } + + idx = ioat2_desc_alloc(ioat, 1); + desc = ioat2_get_ring_ent(ioat, idx); + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + __ioat2_issue_pending(ioat); +} + +static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + spin_lock_bh(&ioat->ring_lock); + __ioat2_start_null_desc(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +static void ioat2_cleanup(struct ioat2_dma_chan *ioat); + +/** + * ioat2_reset_part2 - reinit the channel after a reset + */ +static void ioat2_reset_part2(struct work_struct *work) +{ + struct ioat_chan_common *chan; + struct ioat2_dma_chan *ioat; + + chan = container_of(work, struct ioat_chan_common, work.work); + ioat = container_of(chan, struct ioat2_dma_chan, base); + + /* ensure that ->tail points to the stalled descriptor + * (ioat->pending is set to 2 at this point so no new + * descriptors will be issued while we perform this cleanup) + */ + ioat2_cleanup(ioat); + + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->ring_lock); + + /* set the tail to be re-issued */ + ioat->issued = ioat->tail; + ioat->dmacount = 0; + + if (ioat2_ring_pending(ioat)) { + struct ioat_ring_ent *desc; + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(((u64) desc->txd.phys) >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + __ioat2_issue_pending(ioat); + } else + __ioat2_start_null_desc(ioat); + + spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&chan->cleanup_lock); + + dev_info(to_dev(chan), + "chan%d reset - %d descs waiting, %d total desc\n", + chan_num(chan), ioat->dmacount, 1 << ioat->alloc_order); +} + +/** + * ioat2_reset_channel - restart a channel + * @ioat: IOAT DMA channel handle + */ +static void ioat2_reset_channel(struct ioat2_dma_chan *ioat) +{ + u32 chansts, chanerr; + struct ioat_chan_common *chan = &ioat->base; + u16 active; + + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + spin_unlock_bh(&ioat->ring_lock); + if (!active) + return; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + chansts = (chan->completion_virt->low + & IOAT_CHANSTS_DMA_TRANSFER_STATUS); + if (chanerr) { + dev_err(to_dev(chan), + "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", + chan_num(chan), chansts, chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + spin_lock_bh(&ioat->ring_lock); + ioat->pending = 2; + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + + IOAT_CHANCMD_OFFSET(chan->device->version)); + spin_unlock_bh(&ioat->ring_lock); + schedule_delayed_work(&chan->work, RESET_DELAY); +} + +/** + * ioat2_chan_watchdog - watch for stuck channels + */ +static void ioat2_chan_watchdog(struct work_struct *work) +{ + struct ioatdma_device *device = + container_of(work, struct ioatdma_device, work.work); + struct ioat2_dma_chan *ioat; + struct ioat_chan_common *chan; + u16 active; + int i; + + for (i = 0; i < device->common.chancnt; i++) { + chan = ioat_chan_by_index(device, i); + ioat = container_of(chan, struct ioat2_dma_chan, base); + + /* + * for version 2.0 if there are descriptors yet to be processed + * and the last completed hasn't changed since the last watchdog + * if they haven't hit the pending level + * issue the pending to push them through + * else + * try resetting the channel + */ + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + spin_unlock_bh(&ioat->ring_lock); + + if (active && + chan->last_completion && + chan->last_completion == chan->watchdog_completion) { + + if (ioat->pending == 1) + ioat2_issue_pending(&chan->common); + else { + ioat2_reset_channel(ioat); + chan->watchdog_completion = 0; + } + } else { + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_completion = chan->last_completion; + } + chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; + } + schedule_delayed_work(&device->work, WATCHDOG_DELAY); +} + +/** + * ioat2_cleanup - clean finished descriptors (advance tail pointer) + * @chan: ioat channel to be cleaned up + */ +static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + struct ioat_ring_ent *desc; + bool seen_current = false; + u16 active; + int i; + struct dma_async_tx_descriptor *tx; + + prefetch(chan->completion_virt); + + spin_lock_bh(&chan->cleanup_lock); + phys_complete = ioat_get_current_completion(chan); + if (phys_complete == chan->last_completion) { + spin_unlock_bh(&chan->cleanup_lock); + /* + * perhaps we're stuck so hard that the watchdog can't go off? + * try to catch it after WATCHDOG_DELAY seconds + */ + if (chan->device->version < IOAT_VER_3_0) { + unsigned long tmo; + + tmo = chan->last_completion_time + HZ*WATCHDOG_DELAY; + if (time_after(jiffies, tmo)) { + ioat2_chan_watchdog(&(chan->device->work.work)); + chan->last_completion_time = jiffies; + } + } + return; + } + chan->last_completion_time = jiffies; + + spin_lock_bh(&ioat->ring_lock); + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + tx = &desc->txd; + if (tx->cookie) { + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + chan->completed_cookie = tx->cookie; + tx->cookie = 0; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + } + ioat->tail += i; + BUG_ON(!seen_current); /* no active descs have written a completion? */ + spin_unlock_bh(&ioat->ring_lock); + + chan->last_completion = phys_complete; + + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat2_cleanup_tasklet(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + + ioat2_cleanup(ioat); + writew(IOAT_CHANCTRL_INT_DISABLE, + ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +/** + * ioat2_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +static int ioat2_enumerate_channels(struct ioatdma_device *device) +{ + struct ioat2_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + u8 xfercap_log; + int i; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + if (xfercap_log == 0) + return 0; + + /* FIXME which i/oat version is i7300? */ +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i, + ioat2_reset_part2, + ioat2_cleanup_tasklet, + (unsigned long) ioat); + ioat->xfercap_log = xfercap_log; + spin_lock_init(&ioat->ring_lock); + } + dma->chancnt = i; + return i; +} + +static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + dma_cookie_t cookie = c->cookie; + + cookie++; + if (cookie < 0) + cookie = 1; + tx->cookie = cookie; + c->cookie = cookie; + ioat2_update_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); + + return cookie; +} + +static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan) +{ + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + struct ioatdma_device *dma; + dma_addr_t phys; + + dma = to_ioatdma_device(chan->device); + hw = pci_pool_alloc(dma->dma_pool, GFP_KERNEL, &phys); + if (!hw) + return NULL; + memset(hw, 0, sizeof(*hw)); + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) { + pci_pool_free(dma->dma_pool, hw, phys); + return NULL; + } + + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = ioat2_tx_submit_unlock; + desc->hw = hw; + desc->txd.phys = phys; + return desc; +} + +static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan) +{ + struct ioatdma_device *dma; + + dma = to_ioatdma_device(chan->device); + pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); + kfree(desc); +} + +/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring + * @chan: channel to be initialized + */ +static int ioat2_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent **ring; + u16 chanctrl; + u32 chanerr; + int descs; + int i; + + /* have we already been set up? */ + if (ioat->ring) + return 1 << ioat->alloc_order; + + /* Setup register to interrupt and write completion status on error */ + chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | + IOAT_CHANCTRL_ERR_COMPLETION_EN; + writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + if (chanerr) { + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion_virt = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, + &chan->completion_addr); + if (!chan->completion_virt) + return -ENOMEM; + + memset(chan->completion_virt, 0, + sizeof(*chan->completion_virt)); + writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_addr) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + ioat->alloc_order = ioat_get_alloc_order(); + descs = 1 << ioat->alloc_order; + + /* allocate the array to hold the software ring */ + ring = kcalloc(descs, sizeof(*ring), GFP_KERNEL); + if (!ring) + return -ENOMEM; + for (i = 0; i < descs; i++) { + ring[i] = ioat2_alloc_ring_ent(c); + if (!ring[i]) { + while (i--) + ioat2_free_ring_ent(ring[i], c); + kfree(ring); + return -ENOMEM; + } + } + + /* link descs */ + for (i = 0; i < descs-1; i++) { + struct ioat_ring_ent *next = ring[i+1]; + struct ioat_dma_descriptor *hw = ring[i]->hw; + + hw->next = next->txd.phys; + } + ring[i]->hw->next = ring[0]->txd.phys; + + spin_lock_bh(&ioat->ring_lock); + ioat->ring = ring; + ioat->head = 0; + ioat->issued = 0; + ioat->tail = 0; + ioat->pending = 0; + spin_unlock_bh(&ioat->ring_lock); + + tasklet_enable(&chan->cleanup_task); + ioat2_start_null_desc(ioat); + + return descs; +} + +/** + * ioat2_alloc_and_lock - common descriptor alloc boilerplate for ioat2,3 ops + * @idx: gets starting descriptor index on successful allocation + * @ioat: ioat2,3 channel (ring) to operate on + * @num_descs: allocation length + */ +static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs) +{ + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&ioat->ring_lock); + if (unlikely(ioat2_ring_space(ioat) < num_descs)) { + if (printk_ratelimit()) + dev_dbg(to_dev(chan), + "%s: ring full! num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, + ioat->issued); + spin_unlock_bh(&ioat->ring_lock); + + /* do direct reclaim in the allocation failure case */ + ioat2_cleanup(ioat); + + return -ENOMEM; + } + + dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, ioat->issued); + + *idx = ioat2_desc_alloc(ioat, num_descs); + return 0; /* with ioat->ring_lock held */ +} + +static struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + dma_addr_t dst = dma_dest; + dma_addr_t src = dma_src; + size_t total_len = len; + int num_descs; + u16 idx; + int i; + + num_descs = ioat2_xferlen_to_descs(ioat, len); + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i++) { + size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + hw = desc->hw; + + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dst; + + len -= copy; + dst += copy; + src += copy; + } + + desc->txd.flags = flags; + desc->len = total_len; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + /* we leave the channel locked to ensure in order submission */ + + return &desc->txd; +} + +/** + * ioat2_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +static void ioat2_free_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; + struct ioat_ring_ent *desc; + const u16 total_descs = 1 << ioat->alloc_order; + int descs; + int i; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (!ioat->ring) + return; + + tasklet_disable(&chan->cleanup_task); + ioat2_cleanup(ioat); + + /* Delay 100ms after reset to allow internal DMA logic to quiesce + * before removing DMA descriptor resources. + */ + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + mdelay(100); + + spin_lock_bh(&ioat->ring_lock); + descs = ioat2_ring_space(ioat); + for (i = 0; i < descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->head + i); + ioat2_free_ring_ent(desc, c); + } + + if (descs < total_descs) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + total_descs - descs); + + for (i = 0; i < total_descs - descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + ioat2_free_ring_ent(desc, c); + } + + kfree(ioat->ring); + ioat->ring = NULL; + ioat->alloc_order = 0; + pci_pool_free(ioatdma_device->completion_pool, + chan->completion_virt, + chan->completion_addr); + spin_unlock_bh(&ioat->ring_lock); + + chan->last_completion = 0; + chan->completion_addr = 0; + ioat->pending = 0; + ioat->dmacount = 0; + chan->watchdog_completion = 0; + chan->last_compl_desc_addr_hw = 0; + chan->watchdog_tcp_cookie = 0; + chan->watchdog_last_tcp_cookie = 0; +} + +static enum dma_status +ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; + + ioat2_cleanup(ioat); + + return ioat_is_complete(c, cookie, done, used); +} + +int ioat2_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(2048); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat2_dca_init(pdev, device->reg_base); + + INIT_DELAYED_WORK(&device->work, ioat2_chan_watchdog); + schedule_delayed_work(&device->work, WATCHDOG_DELAY); + + return err; +} + +int ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + u16 dev_id; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + /* -= IOAT ver.3 workarounds =- */ + /* Write CHANERRMSK_INT with 3E07h to mask out the errors + * that can cause stability issues for IOAT ver.3 + */ + pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) + pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(262144); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return err; +} diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h new file mode 100644 index 00000000000..94a553eacdb --- /dev/null +++ b/drivers/dma/ioat/dma_v2.h @@ -0,0 +1,131 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_V2_H +#define IOATDMA_V2_H + +#include +#include "dma.h" +#include "hw.h" + + +extern int ioat_pending_level; + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +#define IOAT_MAX_ORDER 16 +#define ioat_get_alloc_order() \ + (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) + +/* struct ioat2_dma_chan - ioat v2 / v3 channel attributes + * @base: common ioat channel parameters + * @xfercap_log; log2 of channel max transfer length (for fast division) + * @head: allocated index + * @issued: hardware notification point + * @tail: cleanup index + * @pending: lock free indicator for issued != head + * @dmacount: identical to 'head' except for occasionally resetting to zero + * @alloc_order: log2 of the number of allocated descriptors + * @ring: software ring buffer implementation of hardware ring + * @ring_lock: protects ring attributes + */ +struct ioat2_dma_chan { + struct ioat_chan_common base; + size_t xfercap_log; + u16 head; + u16 issued; + u16 tail; + u16 dmacount; + u16 alloc_order; + int pending; + struct ioat_ring_ent **ring; + spinlock_t ring_lock; +}; + +static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat2_dma_chan, base); +} + +static inline u16 ioat2_ring_mask(struct ioat2_dma_chan *ioat) +{ + return (1 << ioat->alloc_order) - 1; +} + +/* count of descriptors in flight with the engine */ +static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->tail) & ioat2_ring_mask(ioat); +} + +/* count of descriptors pending submission to hardware */ +static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->issued) & ioat2_ring_mask(ioat); +} + +static inline u16 ioat2_ring_space(struct ioat2_dma_chan *ioat) +{ + u16 num_descs = ioat2_ring_mask(ioat) + 1; + u16 active = ioat2_ring_active(ioat); + + BUG_ON(active > num_descs); + + return num_descs - active; +} + +/* assumes caller already checked space */ +static inline u16 ioat2_desc_alloc(struct ioat2_dma_chan *ioat, u16 len) +{ + ioat->head += len; + return ioat->head - len; +} + +static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len) +{ + u16 num_descs = len >> ioat->xfercap_log; + + num_descs += !!(len & ((1 << ioat->xfercap_log) - 1)); + return num_descs; +} + +struct ioat_ring_ent { + struct ioat_dma_descriptor *hw; + struct dma_async_tx_descriptor txd; + size_t len; +}; + +static inline struct ioat_ring_ent * +ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) +{ + return ioat->ring[idx & ioat2_ring_mask(ioat)]; +} + +int ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +#endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 55414d88ac1..c4e43226925 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -31,6 +31,7 @@ #include #include #include "dma.h" +#include "dma_v2.h" #include "registers.h" #include "hw.h" From 38e12f64a165e83617c21dae3c15972fd8d639f5 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:00:46 -0700 Subject: [PATCH 40/91] ioat1: kill unused unmap parameters The unified ioat1/ioat2 ioat_dma_unmap() implementation derives the source and dest addresses from the unmap descriptor. There is no longer a need to track this information in struct ioat_desc_sw. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 2 -- drivers/dma/ioat/dma.h | 2 -- 2 files changed, 4 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 64b4d75059a..696d4de3bb8 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -648,8 +648,6 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, desc->txd.flags = flags; desc->tx_cnt = tx_cnt; - desc->src = dma_src; - desc->dst = dma_dest; desc->len = total_len; list_splice(&chain, &desc->txd.tx_list); hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 84065dfa4d4..fa15e77652a 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -179,8 +179,6 @@ struct ioat_desc_sw { struct list_head node; int tx_cnt; size_t len; - dma_addr_t src; - dma_addr_t dst; struct dma_async_tx_descriptor txd; }; From 6df9183a153291a2585a8dfe67597fc18c201147 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:00:55 -0700 Subject: [PATCH 41/91] ioat: add some dev_dbg() calls Provide some output for debugging the driver. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 29 ++++++++++++++++++++++++++--- drivers/dma/ioat/dma.h | 28 ++++++++++++++++++++++++++++ drivers/dma/ioat/dma_v2.c | 25 ++++++++++++++++++++++++- drivers/dma/ioat/dma_v2.h | 3 +++ 4 files changed, 81 insertions(+), 4 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 696d4de3bb8..edf4f5e5de7 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -134,6 +134,7 @@ static int ioat1_enumerate_channels(struct ioatdma_device *device) dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); + dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap); #ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) @@ -167,6 +168,8 @@ __ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) { void __iomem *reg_base = ioat->base.reg_base; + dev_dbg(to_dev(&ioat->base), "%s: pending: %d\n", + __func__, ioat->pending); ioat->pending = 0; writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET); } @@ -251,6 +254,7 @@ static void ioat1_reset_channel(struct ioat_dma_chan *ioat) if (!ioat->used_desc.prev) return; + dev_dbg(to_dev(chan), "%s\n", __func__); chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); chansts = (chan->completion_virt->low & IOAT_CHANSTS_DMA_TRANSFER_STATUS); @@ -382,6 +386,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) cookie = 1; c->cookie = cookie; tx->cookie = cookie; + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); /* write address into NextDescriptor field of last desc in chain */ first = to_ioat_desc(tx->tx_list.next); @@ -390,6 +395,8 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) wmb(); chain_tail->hw->next = first->txd.phys; list_splice_tail_init(&tx->tx_list, &ioat->used_desc); + dump_desc_dbg(ioat, chain_tail); + dump_desc_dbg(ioat, first); ioat->pending += desc->tx_cnt; if (ioat->pending >= ioat_pending_level) @@ -429,6 +436,7 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) desc_sw->txd.tx_submit = ioat1_tx_submit; desc_sw->hw = desc; desc_sw->txd.phys = phys; + set_desc_id(desc_sw, -1); return desc_sw; } @@ -474,6 +482,7 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) dev_err(to_dev(chan), "Only %d initial descriptors\n", i); break; } + set_desc_id(desc, i); list_add_tail(&desc->node, &tmp_list); } spin_lock_bh(&ioat->desc_lock); @@ -495,6 +504,8 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) tasklet_enable(&chan->cleanup_task); ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, ioat->desccount); return ioat->desccount; } @@ -527,8 +538,10 @@ static void ioat1_dma_free_chan_resources(struct dma_chan *c) mdelay(100); spin_lock_bh(&ioat->desc_lock); - list_for_each_entry_safe(desc, _desc, - &ioat->used_desc, node) { + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { + dev_dbg(to_dev(chan), "%s: freeing %d from used list\n", + __func__, desc_id(desc)); + dump_desc_dbg(ioat, desc); in_use_descs++; list_del(&desc->node); pci_pool_free(ioatdma_device->dma_pool, desc->hw, @@ -585,7 +598,8 @@ ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) return NULL; } } - + dev_dbg(to_dev(&ioat->base), "%s: allocated: %d\n", + __func__, desc_id(new)); prefetch(new->hw); return new; } @@ -630,6 +644,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, async_tx_ack(&desc->txd); next = ioat1_dma_get_next_descriptor(ioat); hw->next = next ? next->txd.phys : 0; + dump_desc_dbg(ioat, desc); desc = next; } else hw->next = 0; @@ -652,6 +667,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, list_splice(&chain, &desc->txd.tx_list); hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); hw->ctl_f.compl_write = 1; + dump_desc_dbg(ioat, desc); return &desc->txd; } @@ -707,6 +723,9 @@ unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) phys_complete = chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; #endif + dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, + (unsigned long long) phys_complete); + if ((chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { @@ -758,6 +777,8 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat) return; } + dev_dbg(to_dev(chan), "%s: phys_complete: %lx\n", + __func__, phys_complete); list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { tx = &desc->txd; /* @@ -765,6 +786,7 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat) * due to exceeding xfercap, perhaps. If so, only the * last one will have a cookie, and require unmapping. */ + dump_desc_dbg(ioat, desc); if (tx->cookie) { cookie = tx->cookie; ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); @@ -848,6 +870,7 @@ static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) async_tx_ack(&desc->txd); hw->next = 0; list_add_tail(&desc->node, &ioat->used_desc); + dump_desc_dbg(ioat, desc); writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index fa15e77652a..9f9edc2cd07 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -173,6 +173,7 @@ ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, * or attached to a transaction list (async_tx.tx_list) * @tx_cnt: number of descriptors required to complete the transaction * @txd: the generic software descriptor for all engines + * @id: identifier for debug */ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; @@ -180,8 +181,35 @@ struct ioat_desc_sw { int tx_cnt; size_t len; struct dma_async_tx_descriptor txd; + #ifdef DEBUG + int id; + #endif }; +#ifdef DEBUG +#define set_desc_id(desc, i) ((desc)->id = (i)) +#define desc_id(desc) ((desc)->id) +#else +#define set_desc_id(desc, i) +#define desc_id(desc) (0) +#endif + +static inline void +__dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw, + struct dma_async_tx_descriptor *tx, int id) +{ + struct device *dev = to_dev(chan); + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x" + " ctl: %#x (op: %d int_en: %d compl: %d)\n", id, + (unsigned long long) tx->phys, + (unsigned long long) hw->next, tx->cookie, tx->flags, + hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write); +} + +#define dump_desc_dbg(c, d) \ + ({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; }) + static inline void ioat_set_tcp_copy_break(unsigned long copybreak) { #ifdef CONFIG_NET_DMA diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 49ba1c73d95..58881860f40 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -54,7 +54,9 @@ static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) /* make descriptor updates globally visible before notifying channel */ wmb(); writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); - + dev_dbg(to_dev(&ioat->base), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); } static void ioat2_issue_pending(struct dma_chan *chan) @@ -101,6 +103,8 @@ static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) return; } + dev_dbg(to_dev(&ioat->base), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); idx = ioat2_desc_alloc(ioat, 1); desc = ioat2_get_ring_ent(ioat, idx); @@ -118,6 +122,7 @@ static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) reg_base + IOAT2_CHAINADDR_OFFSET_LOW); writel(((u64) desc->txd.phys) >> 32, reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + dump_desc_dbg(ioat, desc); __ioat2_issue_pending(ioat); } @@ -154,6 +159,10 @@ static void ioat2_reset_part2(struct work_struct *work) ioat->issued = ioat->tail; ioat->dmacount = 0; + dev_dbg(to_dev(&ioat->base), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); + if (ioat2_ring_pending(ioat)) { struct ioat_ring_ent *desc; @@ -221,6 +230,8 @@ static void ioat2_chan_watchdog(struct work_struct *work) u16 active; int i; + dev_dbg(&device->pdev->dev, "%s\n", __func__); + for (i = 0; i < device->common.chancnt; i++) { chan = ioat_chan_by_index(device, i); ioat = container_of(chan, struct ioat2_dma_chan, base); @@ -295,11 +306,15 @@ static void ioat2_cleanup(struct ioat2_dma_chan *ioat) spin_lock_bh(&ioat->ring_lock); + dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + active = ioat2_ring_active(ioat); for (i = 0; i < active && !seen_current; i++) { prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); desc = ioat2_get_ring_ent(ioat, ioat->tail + i); tx = &desc->txd; + dump_desc_dbg(ioat, desc); if (tx->cookie) { ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); chan->completed_cookie = tx->cookie; @@ -348,6 +363,7 @@ static int ioat2_enumerate_channels(struct ioatdma_device *device) xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); if (xfercap_log == 0) return 0; + dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); /* FIXME which i/oat version is i7300? */ #ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL @@ -381,6 +397,8 @@ static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) cookie = 1; tx->cookie = cookie; c->cookie = cookie; + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + ioat2_update_pending(ioat); spin_unlock_bh(&ioat->ring_lock); @@ -480,6 +498,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) kfree(ring); return -ENOMEM; } + set_desc_id(ring[i], i); } /* link descs */ @@ -571,12 +590,14 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, len -= copy; dst += copy; src += copy; + dump_desc_dbg(ioat, desc); } desc->txd.flags = flags; desc->len = total_len; hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); hw->ctl_f.compl_write = 1; + dump_desc_dbg(ioat, desc); /* we leave the channel locked to ensure in order submission */ return &desc->txd; @@ -614,6 +635,7 @@ static void ioat2_free_chan_resources(struct dma_chan *c) spin_lock_bh(&ioat->ring_lock); descs = ioat2_ring_space(ioat); + dev_dbg(to_dev(chan), "freeing %d idle descriptors\n", descs); for (i = 0; i < descs; i++) { desc = ioat2_get_ring_ent(ioat, ioat->head + i); ioat2_free_ring_ent(desc, c); @@ -625,6 +647,7 @@ static void ioat2_free_chan_resources(struct dma_chan *c) for (i = 0; i < total_descs - descs; i++) { desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + dump_desc_dbg(ioat, desc); ioat2_free_ring_ent(desc, c); } diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index 94a553eacdb..c72ccb5dfd5 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -116,6 +116,9 @@ struct ioat_ring_ent { struct ioat_dma_descriptor *hw; struct dma_async_tx_descriptor txd; size_t len; + #ifdef DEBUG + int id; + #endif }; static inline struct ioat_ring_ent * From 4fb9b9e8d55880523db550043dfb204696dd0422 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:04 -0700 Subject: [PATCH 42/91] ioat: cleanup completion status reads The cleanup path makes an effort to only perform an atomic read of the 64-bit completion address. However in the 32-bit case it does not matter if we read the upper-32 and lower-32 non-atomically because the upper-32 will always be zero. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 78 ++++++++++++++---------------------- drivers/dma/ioat/dma.h | 10 +---- drivers/dma/ioat/dma_v2.c | 25 +++++------- drivers/dma/ioat/registers.h | 8 ++-- 4 files changed, 46 insertions(+), 75 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index edf4f5e5de7..08417ad4edc 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -201,8 +201,7 @@ static void ioat1_reset_part2(struct work_struct *work) spin_lock_bh(&chan->cleanup_lock); spin_lock_bh(&ioat->desc_lock); - chan->completion_virt->low = 0; - chan->completion_virt->high = 0; + *chan->completion = 0; ioat->pending = 0; /* count the descriptors waiting */ @@ -256,8 +255,7 @@ static void ioat1_reset_channel(struct ioat_dma_chan *ioat) dev_dbg(to_dev(chan), "%s\n", __func__); chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); - chansts = (chan->completion_virt->low - & IOAT_CHANSTS_DMA_TRANSFER_STATUS); + chansts = *chan->completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS; if (chanerr) { dev_err(to_dev(chan), "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", @@ -293,14 +291,8 @@ static void ioat1_chan_watchdog(struct work_struct *work) struct ioat_dma_chan *ioat; struct ioat_chan_common *chan; int i; - - union { - u64 full; - struct { - u32 low; - u32 high; - }; - } completion_hw; + u64 completion; + u32 completion_low; unsigned long compl_desc_addr_hw; for (i = 0; i < device->common.chancnt; i++) { @@ -334,25 +326,24 @@ static void ioat1_chan_watchdog(struct work_struct *work) * try resetting the channel */ - completion_hw.low = readl(chan->reg_base + + /* we need to read the low address first as this + * causes the chipset to latch the upper bits + * for the subsequent read + */ + completion_low = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(chan->device->version)); - completion_hw.high = readl(chan->reg_base + + completion = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(chan->device->version)); -#if (BITS_PER_LONG == 64) - compl_desc_addr_hw = - completion_hw.full - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; -#else - compl_desc_addr_hw = - completion_hw.low & IOAT_LOW_COMPLETION_MASK; -#endif + completion <<= 32; + completion |= completion_low; + compl_desc_addr_hw = completion & + IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; if ((compl_desc_addr_hw != 0) && (compl_desc_addr_hw != chan->watchdog_completion) && (compl_desc_addr_hw != chan->last_compl_desc_addr_hw)) { chan->last_compl_desc_addr_hw = compl_desc_addr_hw; - chan->completion_virt->low = completion_hw.low; - chan->completion_virt->high = completion_hw.high; + *chan->completion = completion; } else { ioat1_reset_channel(ioat); chan->watchdog_completion = 0; @@ -492,14 +483,12 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) /* allocate a completion writeback area */ /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ - chan->completion_virt = pci_pool_alloc(chan->device->completion_pool, - GFP_KERNEL, - &chan->completion_addr); - memset(chan->completion_virt, 0, - sizeof(*chan->completion_virt)); - writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF, + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); - writel(((u64) chan->completion_addr) >> 32, + writel(((u64) chan->completion_dma) >> 32, chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); tasklet_enable(&chan->cleanup_task); @@ -558,15 +547,16 @@ static void ioat1_dma_free_chan_resources(struct dma_chan *c) spin_unlock_bh(&ioat->desc_lock); pci_pool_free(ioatdma_device->completion_pool, - chan->completion_virt, - chan->completion_addr); + chan->completion, + chan->completion_dma); /* one is ok since we left it on there on purpose */ if (in_use_descs > 1) dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", in_use_descs - 1); - chan->last_completion = chan->completion_addr = 0; + chan->last_completion = 0; + chan->completion_dma = 0; chan->watchdog_completion = 0; chan->last_compl_desc_addr_hw = 0; chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0; @@ -709,25 +699,15 @@ void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) { unsigned long phys_complete; + u64 completion; - /* The completion writeback can happen at any time, - so reads by the driver need to be atomic operations - The descriptor physical addresses are limited to 32-bits - when the CPU can only do a 32-bit mov */ - -#if (BITS_PER_LONG == 64) - phys_complete = - chan->completion_virt->full - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; -#else - phys_complete = chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; -#endif + completion = *chan->completion; + phys_complete = completion & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, (unsigned long long) phys_complete); - if ((chan->completion_virt->full - & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == + if ((completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", readl(chan->reg_base + IOAT_CHANERR_OFFSET)); @@ -750,7 +730,7 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat) dma_cookie_t cookie = 0; struct dma_async_tx_descriptor *tx; - prefetch(chan->completion_virt); + prefetch(chan->completion); if (!spin_trylock_bh(&chan->cleanup_lock)) return; diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 9f9edc2cd07..5fd6e2de84d 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -96,14 +96,8 @@ struct ioat_chan_common { struct ioatdma_device *device; struct dma_chan common; - dma_addr_t completion_addr; - union { - u64 full; /* HW completion writeback */ - struct { - u32 low; - u32 high; - }; - } *completion_virt; + dma_addr_t completion_dma; + u64 *completion; unsigned long last_compl_desc_addr_hw; struct tasklet_struct cleanup_task; }; diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 58881860f40..ca113424934 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -200,8 +200,7 @@ static void ioat2_reset_channel(struct ioat2_dma_chan *ioat) return; chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); - chansts = (chan->completion_virt->low - & IOAT_CHANSTS_DMA_TRANSFER_STATUS); + chansts = *chan->completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS; if (chanerr) { dev_err(to_dev(chan), "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", @@ -281,7 +280,7 @@ static void ioat2_cleanup(struct ioat2_dma_chan *ioat) int i; struct dma_async_tx_descriptor *tx; - prefetch(chan->completion_virt); + prefetch(chan->completion); spin_lock_bh(&chan->cleanup_lock); phys_complete = ioat_get_current_completion(chan); @@ -470,17 +469,15 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) /* allocate a completion writeback area */ /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ - chan->completion_virt = pci_pool_alloc(chan->device->completion_pool, - GFP_KERNEL, - &chan->completion_addr); - if (!chan->completion_virt) + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + if (!chan->completion) return -ENOMEM; - memset(chan->completion_virt, 0, - sizeof(*chan->completion_virt)); - writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF, + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); - writel(((u64) chan->completion_addr) >> 32, + writel(((u64) chan->completion_dma) >> 32, chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); ioat->alloc_order = ioat_get_alloc_order(); @@ -655,12 +652,12 @@ static void ioat2_free_chan_resources(struct dma_chan *c) ioat->ring = NULL; ioat->alloc_order = 0; pci_pool_free(ioatdma_device->completion_pool, - chan->completion_virt, - chan->completion_addr); + chan->completion, + chan->completion_dma); spin_unlock_bh(&ioat->ring_lock); chan->last_completion = 0; - chan->completion_addr = 0; + chan->completion_dma = 0; ioat->pending = 0; ioat->dmacount = 0; chan->watchdog_completion = 0; diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index 49bc277424f..a83c7332125 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -94,10 +94,10 @@ #define IOAT2_CHANSTS_OFFSET_HIGH 0x0C #define IOAT_CHANSTS_OFFSET_HIGH(ver) ((ver) < IOAT_VER_2_0 \ ? IOAT1_CHANSTS_OFFSET_HIGH : IOAT2_CHANSTS_OFFSET_HIGH) -#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR ~0x3F -#define IOAT_CHANSTS_SOFT_ERR 0x0000000000000010 -#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x0000000000000008 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS 0x0000000000000007 +#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL) +#define IOAT_CHANSTS_SOFT_ERR 0x10ULL +#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x8ULL +#define IOAT_CHANSTS_DMA_TRANSFER_STATUS 0x7ULL #define IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE 0x0 #define IOAT_CHANSTS_DMA_TRANSFER_STATUS_DONE 0x1 #define IOAT_CHANSTS_DMA_TRANSFER_STATUS_SUSPENDED 0x2 From bb3207863014c7310593146f11fbc6573eab43c8 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:14 -0700 Subject: [PATCH 43/91] ioat: ignore reserved bits for chancnt and xfercap Don't trust that the reserved bits are always zero, also sanity check the returned value. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 7 +++++++ drivers/dma/ioat/dma_v2.c | 7 +++++++ 2 files changed, 14 insertions(+) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 08417ad4edc..5173ba97ba3 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -132,7 +132,14 @@ static int ioat1_enumerate_channels(struct ioatdma_device *device) INIT_LIST_HEAD(&dma->channels); dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_scale &= 0x1f; /* bits [4:0] valid */ xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap); diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index ca113424934..137cf879265 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -359,7 +359,14 @@ static int ioat2_enumerate_channels(struct ioatdma_device *device) INIT_LIST_HEAD(&dma->channels); dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_log &= 0x1f; /* bits [4:0] valid */ if (xfercap_log == 0) return 0; dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); From f6ab95b55735fa03cad8d0f966647e5df206e207 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:21 -0700 Subject: [PATCH 44/91] ioat: preserve chanctrl bits when re-arming interrupts The register write in ioat_dma_cleanup_tasklet is unfortunate in two ways: 1/ It clears the extra 'enable' bits that we set at alloc_chan_resources time 2/ It gives the impression that it disables interrupts when it is in fact re-arming interrupts [ Impact: fix, persist the value of the chanctrl register when re-arming ] Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 10 +++------- drivers/dma/ioat/dma_v2.c | 8 ++------ drivers/dma/ioat/registers.h | 6 +++++- 3 files changed, 10 insertions(+), 14 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 5173ba97ba3..6dd0af194b8 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -452,7 +452,6 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *desc; - u16 chanctrl; u32 chanerr; int i; LIST_HEAD(tmp_list); @@ -462,10 +461,7 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) return ioat->desccount; /* Setup register to interrupt and write completion status on error */ - chanctrl = IOAT_CHANCTRL_ERR_INT_EN | - IOAT_CHANCTRL_ANY_ERR_ABORT_EN | - IOAT_CHANCTRL_ERR_COMPLETION_EN; - writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); if (chanerr) { @@ -672,9 +668,9 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, static void ioat1_cleanup_tasklet(unsigned long data) { struct ioat_dma_chan *chan = (void *)data; + ioat1_cleanup(chan); - writew(IOAT_CHANCTRL_INT_DISABLE, - chan->base.reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, chan->base.reg_base + IOAT_CHANCTRL_OFFSET); } static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 137cf879265..2f34f290041 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -341,8 +341,7 @@ static void ioat2_cleanup_tasklet(unsigned long data) struct ioat2_dma_chan *ioat = (void *) data; ioat2_cleanup(ioat); - writew(IOAT_CHANCTRL_INT_DISABLE, - ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } /** @@ -454,7 +453,6 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat_chan_common *chan = &ioat->base; struct ioat_ring_ent **ring; - u16 chanctrl; u32 chanerr; int descs; int i; @@ -464,9 +462,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) return 1 << ioat->alloc_order; /* Setup register to interrupt and write completion status on error */ - chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | - IOAT_CHANCTRL_ERR_COMPLETION_EN; - writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); if (chanerr) { diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index a83c7332125..4380f6fbf05 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -75,7 +75,11 @@ #define IOAT_CHANCTRL_ERR_INT_EN 0x0010 #define IOAT_CHANCTRL_ANY_ERR_ABORT_EN 0x0008 #define IOAT_CHANCTRL_ERR_COMPLETION_EN 0x0004 -#define IOAT_CHANCTRL_INT_DISABLE 0x0001 +#define IOAT_CHANCTRL_INT_REARM 0x0001 +#define IOAT_CHANCTRL_RUN (IOAT_CHANCTRL_INT_REARM |\ + IOAT_CHANCTRL_ERR_COMPLETION_EN |\ + IOAT_CHANCTRL_ANY_ERR_ABORT_EN |\ + IOAT_CHANCTRL_ERR_INT_EN) #define IOAT_DMA_COMP_OFFSET 0x02 /* 16-bit DMA channel compatibility */ #define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */ From 345d852391cf3fdc73f23a9ca522c6e7b5eb5a52 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:30 -0700 Subject: [PATCH 45/91] ioat: ___devinit annotate the initialization paths Mark all single use initialization routines with __devinit. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dca.c | 9 ++++++--- drivers/dma/ioat/dma.c | 12 ++++++------ drivers/dma/ioat/dma.h | 11 ++++++----- drivers/dma/ioat/dma_v2.c | 4 ++-- drivers/dma/ioat/dma_v2.h | 8 ++++---- 5 files changed, 24 insertions(+), 20 deletions(-) diff --git a/drivers/dma/ioat/dca.c b/drivers/dma/ioat/dca.c index af1c762dd9d..69d02615c4d 100644 --- a/drivers/dma/ioat/dca.c +++ b/drivers/dma/ioat/dca.c @@ -242,7 +242,8 @@ static struct dca_ops ioat_dca_ops = { }; -struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; @@ -407,7 +408,8 @@ static int ioat2_dca_count_dca_slots(void __iomem *iobase, u16 dca_offset) return slots; } -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; @@ -602,7 +604,8 @@ static int ioat3_dca_count_dca_slots(void *iobase, u16 dca_offset) return slots; } -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 6dd0af194b8..abc96c4c079 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -870,7 +870,7 @@ static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) */ #define IOAT_TEST_SIZE 2000 -static void ioat_dma_test_callback(void *dma_async_param) +static void __devinit ioat_dma_test_callback(void *dma_async_param) { struct completion *cmp = dma_async_param; @@ -881,7 +881,7 @@ static void ioat_dma_test_callback(void *dma_async_param) * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. * @device: device to be tested */ -static int ioat_dma_self_test(struct ioatdma_device *device) +static int __devinit ioat_dma_self_test(struct ioatdma_device *device) { int i; u8 *src; @@ -1082,7 +1082,7 @@ static void ioat_disable_interrupts(struct ioatdma_device *device) writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); } -int ioat_probe(struct ioatdma_device *device) +int __devinit ioat_probe(struct ioatdma_device *device) { int err = -ENODEV; struct dma_device *dma = &device->common; @@ -1142,7 +1142,7 @@ err_dma_pool: return err; } -int ioat_register(struct ioatdma_device *device) +int __devinit ioat_register(struct ioatdma_device *device) { int err = dma_async_device_register(&device->common); @@ -1169,7 +1169,7 @@ static void ioat1_intr_quirk(struct ioatdma_device *device) pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); } -int ioat1_dma_probe(struct ioatdma_device *device, int dca) +int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; struct dma_device *dma; @@ -1200,7 +1200,7 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca) return err; } -void ioat_dma_remove(struct ioatdma_device *device) +void __devexit ioat_dma_remove(struct ioatdma_device *device) { struct dma_device *dma = &device->common; diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 5fd6e2de84d..e47083b52ee 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -217,11 +217,12 @@ ioat_chan_by_index(struct ioatdma_device *device, int index) return device->idx[index]; } -int ioat_probe(struct ioatdma_device *device); -int ioat_register(struct ioatdma_device *device); -int ioat1_dma_probe(struct ioatdma_device *dev, int dca); -void ioat_dma_remove(struct ioatdma_device *device); -struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); +int __devinit ioat_probe(struct ioatdma_device *device); +int __devinit ioat_register(struct ioatdma_device *device); +int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca); +void __devexit ioat_dma_remove(struct ioatdma_device *device); +struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev, + void __iomem *iobase); unsigned long ioat_get_current_completion(struct ioat_chan_common *chan); void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx, diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 2f34f290041..1aa2974e7a9 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -683,7 +683,7 @@ ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, return ioat_is_complete(c, cookie, done, used); } -int ioat2_dma_probe(struct ioatdma_device *device, int dca) +int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; struct dma_device *dma; @@ -722,7 +722,7 @@ int ioat2_dma_probe(struct ioatdma_device *device, int dca) return err; } -int ioat3_dma_probe(struct ioatdma_device *device, int dca) +int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; struct dma_device *dma; diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index c72ccb5dfd5..bdde5373cf6 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -127,8 +127,8 @@ ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) return ioat->ring[idx & ioat2_ring_mask(ioat)]; } -int ioat2_dma_probe(struct ioatdma_device *dev, int dca); -int ioat3_dma_probe(struct ioatdma_device *dev, int dca); -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); #endif /* IOATDMA_V2_H */ From ad643f54c8514998333bc6c7b201fda2267496be Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:38 -0700 Subject: [PATCH 46/91] ioat1: trim ioat_dma_desc_sw Save 4 bytes per software descriptor by transmitting tx_cnt in an unused portion of the hardware descriptor. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 4 ++-- drivers/dma/ioat/dma.h | 2 -- drivers/dma/ioat/hw.h | 6 +++++- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index abc96c4c079..f59b6f42f86 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -396,7 +396,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) dump_desc_dbg(ioat, chain_tail); dump_desc_dbg(ioat, first); - ioat->pending += desc->tx_cnt; + ioat->pending += desc->hw->tx_cnt; if (ioat->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat); spin_unlock_bh(&ioat->desc_lock); @@ -655,11 +655,11 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, spin_unlock_bh(&ioat->desc_lock); desc->txd.flags = flags; - desc->tx_cnt = tx_cnt; desc->len = total_len; list_splice(&chain, &desc->txd.tx_list); hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); hw->ctl_f.compl_write = 1; + hw->tx_cnt = tx_cnt; dump_desc_dbg(ioat, desc); return &desc->txd; diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index e47083b52ee..ec851cf5345 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -165,14 +165,12 @@ ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, * @hw: hardware DMA descriptor * @node: this descriptor will either be on the free list, * or attached to a transaction list (async_tx.tx_list) - * @tx_cnt: number of descriptors required to complete the transaction * @txd: the generic software descriptor for all engines * @id: identifier for debug */ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; struct list_head node; - int tx_cnt; size_t len; struct dma_async_tx_descriptor txd; #ifdef DEBUG diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h index e13f3ed4776..7481fb13ce0 100644 --- a/drivers/dma/ioat/hw.h +++ b/drivers/dma/ioat/hw.h @@ -63,7 +63,11 @@ struct ioat_dma_descriptor { uint64_t next; uint64_t rsv1; uint64_t rsv2; - uint64_t user1; + /* store some driver data in an unused portion of the descriptor */ + union { + uint64_t user1; + uint64_t tx_cnt; + }; uint64_t user2; }; #endif From 09c8a5b85e5f1e74a19bdd7c85547429d51df1cd Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:49 -0700 Subject: [PATCH 47/91] ioat: switch watchdog and reset handler from workqueue to timer In order to support dynamic resizing of the descriptor ring or polling for a descriptor in the presence of a hung channel the reset handler needs to make progress while in a non-preemptible context. The current workqueue implementation precludes polling channel reset completion under spin_lock(). This conversion also allows us to return to opportunistic cleanup in the ioat2 case as the timer implementation guarantees at least one cleanup after every descriptor is submitted. This means the worst case completion latency becomes the timer frequency (for exceptional circumstances), but with the benefit of avoiding busy waiting when the lock is contended. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 353 ++++++++++++++--------------------- drivers/dma/ioat/dma.h | 112 +++++++++-- drivers/dma/ioat/dma_v2.c | 321 ++++++++++++++----------------- drivers/dma/ioat/dma_v2.h | 10 + drivers/dma/ioat/registers.h | 22 +-- drivers/idle/i7300_idle.c | 16 +- 6 files changed, 397 insertions(+), 437 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index f59b6f42f86..17a518d0386 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -99,23 +99,26 @@ static void ioat1_cleanup_tasklet(unsigned long data); /* common channel initialization */ void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx, - work_func_t work_fn, void (*tasklet)(unsigned long), - unsigned long tasklet_data) + void (*timer_fn)(unsigned long), + void (*tasklet)(unsigned long), + unsigned long ioat) { struct dma_device *dma = &device->common; chan->device = device; chan->reg_base = device->reg_base + (0x80 * (idx + 1)); - INIT_DELAYED_WORK(&chan->work, work_fn); spin_lock_init(&chan->cleanup_lock); chan->common.device = dma; list_add_tail(&chan->common.device_node, &dma->channels); device->idx[idx] = chan; - tasklet_init(&chan->cleanup_task, tasklet, tasklet_data); + init_timer(&chan->timer); + chan->timer.function = timer_fn; + chan->timer.data = ioat; + tasklet_init(&chan->cleanup_task, tasklet, ioat); tasklet_disable(&chan->cleanup_task); } -static void ioat1_reset_part2(struct work_struct *work); +static void ioat1_timer_event(unsigned long data); /** * ioat1_dma_enumerate_channels - find and initialize the device's channels @@ -153,7 +156,7 @@ static int ioat1_enumerate_channels(struct ioatdma_device *device) break; ioat_init_channel(device, &ioat->base, i, - ioat1_reset_part2, + ioat1_timer_event, ioat1_cleanup_tasklet, (unsigned long) ioat); ioat->xfercap = xfercap; @@ -192,61 +195,6 @@ static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) } } -/** - * ioat1_reset_part2 - reinit the channel after a reset - */ -static void ioat1_reset_part2(struct work_struct *work) -{ - struct ioat_chan_common *chan; - struct ioat_dma_chan *ioat; - struct ioat_desc_sw *desc; - int dmacount; - bool start_null = false; - - chan = container_of(work, struct ioat_chan_common, work.work); - ioat = container_of(chan, struct ioat_dma_chan, base); - spin_lock_bh(&chan->cleanup_lock); - spin_lock_bh(&ioat->desc_lock); - - *chan->completion = 0; - ioat->pending = 0; - - /* count the descriptors waiting */ - dmacount = 0; - if (ioat->used_desc.prev) { - desc = to_ioat_desc(ioat->used_desc.prev); - do { - dmacount++; - desc = to_ioat_desc(desc->node.next); - } while (&desc->node != ioat->used_desc.next); - } - - if (dmacount) { - /* - * write the new starting descriptor address - * this puts channel engine into ARMED state - */ - desc = to_ioat_desc(ioat->used_desc.prev); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - - writeb(IOAT_CHANCMD_START, chan->reg_base - + IOAT_CHANCMD_OFFSET(chan->device->version)); - } else - start_null = true; - spin_unlock_bh(&ioat->desc_lock); - spin_unlock_bh(&chan->cleanup_lock); - - dev_err(to_dev(chan), - "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(chan), dmacount, ioat->desccount); - - if (start_null) - ioat1_dma_start_null_desc(ioat); -} - /** * ioat1_reset_channel - restart a channel * @ioat: IOAT DMA channel handle @@ -257,12 +205,9 @@ static void ioat1_reset_channel(struct ioat_dma_chan *ioat) void __iomem *reg_base = chan->reg_base; u32 chansts, chanerr; - if (!ioat->used_desc.prev) - return; - - dev_dbg(to_dev(chan), "%s\n", __func__); + dev_warn(to_dev(chan), "reset\n"); chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); - chansts = *chan->completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS; + chansts = *chan->completion & IOAT_CHANSTS_STATUS; if (chanerr) { dev_err(to_dev(chan), "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", @@ -278,93 +223,11 @@ static void ioat1_reset_channel(struct ioat_dma_chan *ioat) * while we're waiting. */ - spin_lock_bh(&ioat->desc_lock); ioat->pending = INT_MIN; writeb(IOAT_CHANCMD_RESET, reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); - spin_unlock_bh(&ioat->desc_lock); - - /* schedule the 2nd half instead of sleeping a long time */ - schedule_delayed_work(&chan->work, RESET_DELAY); -} - -/** - * ioat1_chan_watchdog - watch for stuck channels - */ -static void ioat1_chan_watchdog(struct work_struct *work) -{ - struct ioatdma_device *device = - container_of(work, struct ioatdma_device, work.work); - struct ioat_dma_chan *ioat; - struct ioat_chan_common *chan; - int i; - u64 completion; - u32 completion_low; - unsigned long compl_desc_addr_hw; - - for (i = 0; i < device->common.chancnt; i++) { - chan = ioat_chan_by_index(device, i); - ioat = container_of(chan, struct ioat_dma_chan, base); - - if (/* have we started processing anything yet */ - chan->last_completion - /* have we completed any since last watchdog cycle? */ - && (chan->last_completion == chan->watchdog_completion) - /* has TCP stuck on one cookie since last watchdog? */ - && (chan->watchdog_tcp_cookie == chan->watchdog_last_tcp_cookie) - && (chan->watchdog_tcp_cookie != chan->completed_cookie) - /* is there something in the chain to be processed? */ - /* CB1 chain always has at least the last one processed */ - && (ioat->used_desc.prev != ioat->used_desc.next) - && ioat->pending == 0) { - - /* - * check CHANSTS register for completed - * descriptor address. - * if it is different than completion writeback, - * it is not zero - * and it has changed since the last watchdog - * we can assume that channel - * is still working correctly - * and the problem is in completion writeback. - * update completion writeback - * with actual CHANSTS value - * else - * try resetting the channel - */ - - /* we need to read the low address first as this - * causes the chipset to latch the upper bits - * for the subsequent read - */ - completion_low = readl(chan->reg_base + - IOAT_CHANSTS_OFFSET_LOW(chan->device->version)); - completion = readl(chan->reg_base + - IOAT_CHANSTS_OFFSET_HIGH(chan->device->version)); - completion <<= 32; - completion |= completion_low; - compl_desc_addr_hw = completion & - IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; - - if ((compl_desc_addr_hw != 0) - && (compl_desc_addr_hw != chan->watchdog_completion) - && (compl_desc_addr_hw != chan->last_compl_desc_addr_hw)) { - chan->last_compl_desc_addr_hw = compl_desc_addr_hw; - *chan->completion = completion; - } else { - ioat1_reset_channel(ioat); - chan->watchdog_completion = 0; - chan->last_compl_desc_addr_hw = 0; - } - } else { - chan->last_compl_desc_addr_hw = 0; - chan->watchdog_completion = chan->last_completion; - } - - chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; - } - - schedule_delayed_work(&device->work, WATCHDOG_DELAY); + set_bit(IOAT_RESET_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + RESET_DELAY); } static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) @@ -372,6 +235,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) struct dma_chan *c = tx->chan; struct ioat_dma_chan *ioat = to_ioat_chan(c); struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); + struct ioat_chan_common *chan = &ioat->base; struct ioat_desc_sw *first; struct ioat_desc_sw *chain_tail; dma_cookie_t cookie; @@ -396,6 +260,9 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) dump_desc_dbg(ioat, chain_tail); dump_desc_dbg(ioat, first); + if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + ioat->pending += desc->hw->tx_cnt; if (ioat->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat); @@ -520,6 +387,7 @@ static void ioat1_dma_free_chan_resources(struct dma_chan *c) return; tasklet_disable(&chan->cleanup_task); + del_timer_sync(&chan->timer); ioat1_cleanup(ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce @@ -560,9 +428,6 @@ static void ioat1_dma_free_chan_resources(struct dma_chan *c) chan->last_completion = 0; chan->completion_dma = 0; - chan->watchdog_completion = 0; - chan->last_compl_desc_addr_hw = 0; - chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0; ioat->pending = 0; ioat->desccount = 0; } @@ -705,15 +570,15 @@ unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) u64 completion; completion = *chan->completion; - phys_complete = completion & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; + phys_complete = ioat_chansts_to_addr(completion); dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, (unsigned long long) phys_complete); - if ((completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == - IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { + if (is_ioat_halted(completion)) { + u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", - readl(chan->reg_base + IOAT_CHANERR_OFFSET)); + chanerr); /* TODO do something to salvage the situation */ } @@ -721,48 +586,31 @@ unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) return phys_complete; } -/** - * ioat1_cleanup - cleanup up finished descriptors - * @chan: ioat channel to be cleaned up - */ -static void ioat1_cleanup(struct ioat_dma_chan *ioat) +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + unsigned long *phys_complete) +{ + *phys_complete = ioat_get_current_completion(chan); + if (*phys_complete == chan->last_completion) + return false; + clear_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + return true; +} + +static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete) { struct ioat_chan_common *chan = &ioat->base; - unsigned long phys_complete; - struct ioat_desc_sw *desc, *_desc; - dma_cookie_t cookie = 0; + struct list_head *_desc, *n; struct dma_async_tx_descriptor *tx; - prefetch(chan->completion); - - if (!spin_trylock_bh(&chan->cleanup_lock)) - return; - - phys_complete = ioat_get_current_completion(chan); - if (phys_complete == chan->last_completion) { - spin_unlock_bh(&chan->cleanup_lock); - /* - * perhaps we're stuck so hard that the watchdog can't go off? - * try to catch it after 2 seconds - */ - if (time_after(jiffies, - chan->last_completion_time + HZ*WATCHDOG_DELAY)) { - ioat1_chan_watchdog(&(chan->device->work.work)); - chan->last_completion_time = jiffies; - } - return; - } - chan->last_completion_time = jiffies; - - cookie = 0; - if (!spin_trylock_bh(&ioat->desc_lock)) { - spin_unlock_bh(&chan->cleanup_lock); - return; - } - dev_dbg(to_dev(chan), "%s: phys_complete: %lx\n", __func__, phys_complete); - list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { + list_for_each_safe(_desc, n, &ioat->used_desc) { + struct ioat_desc_sw *desc; + + prefetch(n); + desc = list_entry(_desc, typeof(*desc), node); tx = &desc->txd; /* * Incoming DMA requests may use multiple descriptors, @@ -771,7 +619,8 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat) */ dump_desc_dbg(ioat, desc); if (tx->cookie) { - cookie = tx->cookie; + chan->completed_cookie = tx->cookie; + tx->cookie = 0; ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); if (tx->callback) { tx->callback(tx->callback_param); @@ -786,27 +635,110 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat) */ if (async_tx_test_ack(tx)) list_move_tail(&desc->node, &ioat->free_desc); - else - tx->cookie = 0; } else { /* * last used desc. Do not remove, so we can - * append from it, but don't look at it next - * time, either + * append from it. */ - tx->cookie = 0; + + /* if nothing else is pending, cancel the + * completion timeout + */ + if (n == &ioat->used_desc) { + dev_dbg(to_dev(chan), + "%s cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + } /* TODO check status bits? */ break; } } - spin_unlock_bh(&ioat->desc_lock); - chan->last_completion = phys_complete; - if (cookie != 0) - chan->completed_cookie = cookie; +} +/** + * ioat1_cleanup - cleanup up finished descriptors + * @chan: ioat channel to be cleaned up + * + * To prevent lock contention we defer cleanup when the locks are + * contended with a terminal timeout that forces cleanup and catches + * completion notification errors. + */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->desc_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->desc_lock); + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat1_timer_event(unsigned long data) +{ + struct ioat_dma_chan *ioat = (void *) data; + struct ioat_chan_common *chan = &ioat->base; + + dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state); + + spin_lock_bh(&chan->cleanup_lock); + if (test_and_clear_bit(IOAT_RESET_PENDING, &chan->state)) { + struct ioat_desc_sw *desc; + + spin_lock_bh(&ioat->desc_lock); + + /* restart active descriptors */ + desc = to_ioat_desc(ioat->used_desc.prev); + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); + + ioat->pending = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + spin_unlock_bh(&ioat->desc_lock); + } else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + unsigned long phys_complete; + + spin_lock_bh(&ioat->desc_lock); + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat1_reset_channel(ioat); + else { + u64 status = ioat_chansts(chan); + + /* manually update the last completion address */ + if (ioat_chansts_to_addr(status) != 0) + *chan->completion = status; + + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->desc_lock); + } spin_unlock_bh(&chan->cleanup_lock); } @@ -855,13 +787,8 @@ static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) list_add_tail(&desc->node, &ioat->used_desc); dump_desc_dbg(ioat, desc); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - - writeb(IOAT_CHANCMD_START, chan->reg_base - + IOAT_CHANCMD_OFFSET(chan->device->version)); + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); spin_unlock_bh(&ioat->desc_lock); } @@ -1194,9 +1121,6 @@ int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) if (dca) device->dca = ioat_dca_init(pdev, device->reg_base); - INIT_DELAYED_WORK(&device->work, ioat1_chan_watchdog); - schedule_delayed_work(&device->work, WATCHDOG_DELAY); - return err; } @@ -1204,9 +1128,6 @@ void __devexit ioat_dma_remove(struct ioatdma_device *device) { struct dma_device *dma = &device->common; - if (device->version != IOAT_VER_3_0) - cancel_delayed_work(&device->work); - ioat_disable_interrupts(device); dma_async_device_unregister(dma); diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index ec851cf5345..dbfccac3e80 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -23,6 +23,7 @@ #include #include "hw.h" +#include "registers.h" #include #include #include @@ -33,7 +34,6 @@ #define IOAT_LOW_COMPLETION_MASK 0xffffffc0 #define IOAT_DMA_DCA_ANY_CPU ~0 -#define IOAT_WATCHDOG_PERIOD (2 * HZ) #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) @@ -42,9 +42,6 @@ #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) -#define RESET_DELAY msecs_to_jiffies(100) -#define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000)) - /* * workaround for IOAT ver.3.0 null descriptor issue * (channel returns error when size is 0) @@ -72,7 +69,6 @@ struct ioatdma_device { struct pci_pool *completion_pool; struct dma_device common; u8 version; - struct delayed_work work; struct msix_entry msix_entries[4]; struct ioat_chan_common *idx[4]; struct dca_provider *dca; @@ -81,24 +77,21 @@ struct ioatdma_device { }; struct ioat_chan_common { + struct dma_chan common; void __iomem *reg_base; - unsigned long last_completion; - unsigned long last_completion_time; - spinlock_t cleanup_lock; dma_cookie_t completed_cookie; - unsigned long watchdog_completion; - int watchdog_tcp_cookie; - u32 watchdog_last_tcp_cookie; - struct delayed_work work; - + unsigned long state; + #define IOAT_COMPLETION_PENDING 0 + #define IOAT_COMPLETION_ACK 1 + #define IOAT_RESET_PENDING 2 + struct timer_list timer; + #define COMPLETION_TIMEOUT msecs_to_jiffies(100) + #define RESET_DELAY msecs_to_jiffies(100) struct ioatdma_device *device; - struct dma_chan common; - dma_addr_t completion_dma; u64 *completion; - unsigned long last_compl_desc_addr_hw; struct tasklet_struct cleanup_task; }; @@ -148,7 +141,6 @@ ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, last_used = c->cookie; last_complete = chan->completed_cookie; - chan->watchdog_tcp_cookie = cookie; if (done) *done = last_complete; @@ -215,6 +207,85 @@ ioat_chan_by_index(struct ioatdma_device *device, int index) return device->idx[index]; } +static inline u64 ioat_chansts(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + u64 status; + u32 status_lo; + + /* We need to read the low address first as this causes the + * chipset to latch the upper bits for the subsequent read + */ + status_lo = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver)); + status = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver)); + status <<= 32; + status |= status_lo; + + return status; +} + +static inline void ioat_start(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline u64 ioat_chansts_to_addr(u64 status) +{ + return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; +} + +static inline u32 ioat_chanerr(struct ioat_chan_common *chan) +{ + return readl(chan->reg_base + IOAT_CHANERR_OFFSET); +} + +static inline void ioat_suspend(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_SUSPEND, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); +} + +static inline bool is_ioat_active(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE); +} + +static inline bool is_ioat_idle(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE); +} + +static inline bool is_ioat_halted(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED); +} + +static inline bool is_ioat_suspended(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED); +} + +/* channel was fatally programmed */ +static inline bool is_ioat_bug(unsigned long err) +{ + return !!(err & (IOAT_CHANERR_SRC_ADDR_ERR|IOAT_CHANERR_DEST_ADDR_ERR| + IOAT_CHANERR_NEXT_ADDR_ERR|IOAT_CHANERR_CONTROL_ERR| + IOAT_CHANERR_LENGTH_ERR)); +} + int __devinit ioat_probe(struct ioatdma_device *device); int __devinit ioat_register(struct ioatdma_device *device); int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca); @@ -224,8 +295,11 @@ struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev, unsigned long ioat_get_current_completion(struct ioat_chan_common *chan); void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx, - work_func_t work_fn, void (*tasklet)(unsigned long), - unsigned long tasklet_data); + void (*timer_fn)(unsigned long), + void (*tasklet)(unsigned long), + unsigned long ioat); void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, size_t len, struct ioat_dma_descriptor *hw); +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + unsigned long *phys_complete); #endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 1aa2974e7a9..72e59a0d0f2 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -49,7 +49,7 @@ static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) void * __iomem reg_base = ioat->base.reg_base; ioat->pending = 0; - ioat->dmacount += ioat2_ring_pending(ioat); + ioat->dmacount += ioat2_ring_pending(ioat);; ioat->issued = ioat->head; /* make descriptor updates globally visible before notifying channel */ wmb(); @@ -92,7 +92,6 @@ static void ioat2_update_pending(struct ioat2_dma_chan *ioat) static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) { - void __iomem *reg_base = ioat->base.reg_base; struct ioat_ring_ent *desc; struct ioat_dma_descriptor *hw; int idx; @@ -118,10 +117,7 @@ static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) hw->src_addr = 0; hw->dst_addr = 0; async_tx_ack(&desc->txd); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); + ioat2_set_chainaddr(ioat, desc->txd.phys); dump_desc_dbg(ioat, desc); __ioat2_issue_pending(ioat); } @@ -133,177 +129,14 @@ static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) spin_unlock_bh(&ioat->ring_lock); } -static void ioat2_cleanup(struct ioat2_dma_chan *ioat); - -/** - * ioat2_reset_part2 - reinit the channel after a reset - */ -static void ioat2_reset_part2(struct work_struct *work) -{ - struct ioat_chan_common *chan; - struct ioat2_dma_chan *ioat; - - chan = container_of(work, struct ioat_chan_common, work.work); - ioat = container_of(chan, struct ioat2_dma_chan, base); - - /* ensure that ->tail points to the stalled descriptor - * (ioat->pending is set to 2 at this point so no new - * descriptors will be issued while we perform this cleanup) - */ - ioat2_cleanup(ioat); - - spin_lock_bh(&chan->cleanup_lock); - spin_lock_bh(&ioat->ring_lock); - - /* set the tail to be re-issued */ - ioat->issued = ioat->tail; - ioat->dmacount = 0; - - dev_dbg(to_dev(&ioat->base), - "%s: head: %#x tail: %#x issued: %#x count: %#x\n", - __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); - - if (ioat2_ring_pending(ioat)) { - struct ioat_ring_ent *desc; - - desc = ioat2_get_ring_ent(ioat, ioat->tail); - writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->txd.phys) >> 32, - chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - __ioat2_issue_pending(ioat); - } else - __ioat2_start_null_desc(ioat); - - spin_unlock_bh(&ioat->ring_lock); - spin_unlock_bh(&chan->cleanup_lock); - - dev_info(to_dev(chan), - "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(chan), ioat->dmacount, 1 << ioat->alloc_order); -} - -/** - * ioat2_reset_channel - restart a channel - * @ioat: IOAT DMA channel handle - */ -static void ioat2_reset_channel(struct ioat2_dma_chan *ioat) -{ - u32 chansts, chanerr; - struct ioat_chan_common *chan = &ioat->base; - u16 active; - - spin_lock_bh(&ioat->ring_lock); - active = ioat2_ring_active(ioat); - spin_unlock_bh(&ioat->ring_lock); - if (!active) - return; - - chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); - chansts = *chan->completion & IOAT_CHANSTS_DMA_TRANSFER_STATUS; - if (chanerr) { - dev_err(to_dev(chan), - "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", - chan_num(chan), chansts, chanerr); - writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); - } - - spin_lock_bh(&ioat->ring_lock); - ioat->pending = 2; - writeb(IOAT_CHANCMD_RESET, - chan->reg_base - + IOAT_CHANCMD_OFFSET(chan->device->version)); - spin_unlock_bh(&ioat->ring_lock); - schedule_delayed_work(&chan->work, RESET_DELAY); -} - -/** - * ioat2_chan_watchdog - watch for stuck channels - */ -static void ioat2_chan_watchdog(struct work_struct *work) -{ - struct ioatdma_device *device = - container_of(work, struct ioatdma_device, work.work); - struct ioat2_dma_chan *ioat; - struct ioat_chan_common *chan; - u16 active; - int i; - - dev_dbg(&device->pdev->dev, "%s\n", __func__); - - for (i = 0; i < device->common.chancnt; i++) { - chan = ioat_chan_by_index(device, i); - ioat = container_of(chan, struct ioat2_dma_chan, base); - - /* - * for version 2.0 if there are descriptors yet to be processed - * and the last completed hasn't changed since the last watchdog - * if they haven't hit the pending level - * issue the pending to push them through - * else - * try resetting the channel - */ - spin_lock_bh(&ioat->ring_lock); - active = ioat2_ring_active(ioat); - spin_unlock_bh(&ioat->ring_lock); - - if (active && - chan->last_completion && - chan->last_completion == chan->watchdog_completion) { - - if (ioat->pending == 1) - ioat2_issue_pending(&chan->common); - else { - ioat2_reset_channel(ioat); - chan->watchdog_completion = 0; - } - } else { - chan->last_compl_desc_addr_hw = 0; - chan->watchdog_completion = chan->last_completion; - } - chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie; - } - schedule_delayed_work(&device->work, WATCHDOG_DELAY); -} - -/** - * ioat2_cleanup - clean finished descriptors (advance tail pointer) - * @chan: ioat channel to be cleaned up - */ -static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) { struct ioat_chan_common *chan = &ioat->base; - unsigned long phys_complete; + struct dma_async_tx_descriptor *tx; struct ioat_ring_ent *desc; bool seen_current = false; u16 active; int i; - struct dma_async_tx_descriptor *tx; - - prefetch(chan->completion); - - spin_lock_bh(&chan->cleanup_lock); - phys_complete = ioat_get_current_completion(chan); - if (phys_complete == chan->last_completion) { - spin_unlock_bh(&chan->cleanup_lock); - /* - * perhaps we're stuck so hard that the watchdog can't go off? - * try to catch it after WATCHDOG_DELAY seconds - */ - if (chan->device->version < IOAT_VER_3_0) { - unsigned long tmo; - - tmo = chan->last_completion_time + HZ*WATCHDOG_DELAY; - if (time_after(jiffies, tmo)) { - ioat2_chan_watchdog(&(chan->device->work.work)); - chan->last_completion_time = jiffies; - } - } - return; - } - chan->last_completion_time = jiffies; - - spin_lock_bh(&ioat->ring_lock); dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", __func__, ioat->head, ioat->tail, ioat->issued); @@ -329,10 +162,42 @@ static void ioat2_cleanup(struct ioat2_dma_chan *ioat) } ioat->tail += i; BUG_ON(!seen_current); /* no active descs have written a completion? */ - spin_unlock_bh(&ioat->ring_lock); chan->last_completion = phys_complete; + if (ioat->head == ioat->tail) { + dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + } +} +/** + * ioat2_cleanup - clean finished descriptors (advance tail pointer) + * @chan: ioat channel to be cleaned up + */ +static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->ring_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->ring_lock); spin_unlock_bh(&chan->cleanup_lock); } @@ -344,6 +209,90 @@ static void ioat2_cleanup_tasklet(unsigned long data) writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } +static void __restart_chan(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + /* set the tail to be re-issued */ + ioat->issued = ioat->tail; + ioat->dmacount = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + dev_dbg(to_dev(chan), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); + + if (ioat2_ring_pending(ioat)) { + struct ioat_ring_ent *desc; + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + ioat2_set_chainaddr(ioat, desc->txd.phys); + __ioat2_issue_pending(ioat); + } else + __ioat2_start_null_desc(ioat); +} + +static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + u32 status; + + status = ioat_chansts(chan); + if (is_ioat_active(status) || is_ioat_idle(status)) + ioat_suspend(chan); + while (is_ioat_active(status) || is_ioat_idle(status)) { + status = ioat_chansts(chan); + cpu_relax(); + } + + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + __restart_chan(ioat); +} + +static void ioat2_timer_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&chan->cleanup_lock); + if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + unsigned long phys_complete; + u64 status; + + spin_lock_bh(&ioat->ring_lock); + status = ioat_chansts(chan); + + /* when halted due to errors check for channel + * programming errors before advancing the completion state + */ + if (is_ioat_halted(status)) { + u32 chanerr; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + BUG_ON(is_ioat_bug(chanerr)); + } + + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat2_restart_channel(ioat); + else { + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->ring_lock); + } + spin_unlock_bh(&chan->cleanup_lock); +} + /** * ioat2_enumerate_channels - find and initialize the device's channels * @device: the device to be enumerated @@ -381,7 +330,7 @@ static int ioat2_enumerate_channels(struct ioatdma_device *device) break; ioat_init_channel(device, &ioat->base, i, - ioat2_reset_part2, + ioat2_timer_event, ioat2_cleanup_tasklet, (unsigned long) ioat); ioat->xfercap_log = xfercap_log; @@ -395,6 +344,7 @@ static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) { struct dma_chan *c = tx->chan; struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; dma_cookie_t cookie = c->cookie; cookie++; @@ -404,6 +354,8 @@ static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) c->cookie = cookie; dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); ioat2_update_pending(ioat); spin_unlock_bh(&ioat->ring_lock); @@ -543,9 +495,18 @@ static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_d ioat->issued); spin_unlock_bh(&ioat->ring_lock); - /* do direct reclaim in the allocation failure case */ - ioat2_cleanup(ioat); - + /* progress reclaim in the allocation failure case we + * may be called under bh_disabled so we need to trigger + * the timer event directly + */ + spin_lock_bh(&chan->cleanup_lock); + if (jiffies > chan->timer.expires && + timer_pending(&chan->timer)) { + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + spin_unlock_bh(&chan->cleanup_lock); + ioat2_timer_event((unsigned long) ioat); + } else + spin_unlock_bh(&chan->cleanup_lock); return -ENOMEM; } @@ -624,6 +585,7 @@ static void ioat2_free_chan_resources(struct dma_chan *c) return; tasklet_disable(&chan->cleanup_task); + del_timer_sync(&chan->timer); ioat2_cleanup(ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce @@ -663,10 +625,6 @@ static void ioat2_free_chan_resources(struct dma_chan *c) chan->completion_dma = 0; ioat->pending = 0; ioat->dmacount = 0; - chan->watchdog_completion = 0; - chan->last_compl_desc_addr_hw = 0; - chan->watchdog_tcp_cookie = 0; - chan->watchdog_last_tcp_cookie = 0; } static enum dma_status @@ -716,9 +674,6 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) if (dca) device->dca = ioat2_dca_init(pdev, device->reg_base); - INIT_DELAYED_WORK(&device->work, ioat2_chan_watchdog); - schedule_delayed_work(&device->work, WATCHDOG_DELAY); - return err; } diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index bdde5373cf6..73b04a2eb4b 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -127,6 +127,16 @@ ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) return ioat->ring[idx & ioat2_ring_mask(ioat)]; } +static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); +} + int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index 4380f6fbf05..e4334a19538 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -101,11 +101,11 @@ #define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL) #define IOAT_CHANSTS_SOFT_ERR 0x10ULL #define IOAT_CHANSTS_UNAFFILIATED_ERR 0x8ULL -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS 0x7ULL -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE 0x0 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_DONE 0x1 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_SUSPENDED 0x2 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED 0x3 +#define IOAT_CHANSTS_STATUS 0x7ULL +#define IOAT_CHANSTS_ACTIVE 0x0 +#define IOAT_CHANSTS_DONE 0x1 +#define IOAT_CHANSTS_SUSPENDED 0x2 +#define IOAT_CHANSTS_HALTED 0x3 @@ -208,18 +208,18 @@ #define IOAT_CDAR_OFFSET_HIGH 0x24 #define IOAT_CHANERR_OFFSET 0x28 /* 32-bit Channel Error Register */ -#define IOAT_CHANERR_DMA_TRANSFER_SRC_ADDR_ERR 0x0001 -#define IOAT_CHANERR_DMA_TRANSFER_DEST_ADDR_ERR 0x0002 -#define IOAT_CHANERR_NEXT_DESCRIPTOR_ADDR_ERR 0x0004 -#define IOAT_CHANERR_NEXT_DESCRIPTOR_ALIGNMENT_ERR 0x0008 +#define IOAT_CHANERR_SRC_ADDR_ERR 0x0001 +#define IOAT_CHANERR_DEST_ADDR_ERR 0x0002 +#define IOAT_CHANERR_NEXT_ADDR_ERR 0x0004 +#define IOAT_CHANERR_NEXT_DESC_ALIGN_ERR 0x0008 #define IOAT_CHANERR_CHAIN_ADDR_VALUE_ERR 0x0010 #define IOAT_CHANERR_CHANCMD_ERR 0x0020 #define IOAT_CHANERR_CHIPSET_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0040 #define IOAT_CHANERR_DMA_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0080 #define IOAT_CHANERR_READ_DATA_ERR 0x0100 #define IOAT_CHANERR_WRITE_DATA_ERR 0x0200 -#define IOAT_CHANERR_DESCRIPTOR_CONTROL_ERR 0x0400 -#define IOAT_CHANERR_DESCRIPTOR_LENGTH_ERR 0x0800 +#define IOAT_CHANERR_CONTROL_ERR 0x0400 +#define IOAT_CHANERR_LENGTH_ERR 0x0800 #define IOAT_CHANERR_COMPLETION_ADDR_ERR 0x1000 #define IOAT_CHANERR_INT_CONFIGURATION_ERR 0x2000 #define IOAT_CHANERR_SOFT_ERR 0x4000 diff --git a/drivers/idle/i7300_idle.c b/drivers/idle/i7300_idle.c index f2ec7243549..1f20a042a4f 100644 --- a/drivers/idle/i7300_idle.c +++ b/drivers/idle/i7300_idle.c @@ -126,9 +126,9 @@ static void i7300_idle_ioat_stop(void) udelay(10); sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) & - IOAT_CHANSTS_DMA_TRANSFER_STATUS; + IOAT_CHANSTS_STATUS; - if (sts != IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE) + if (sts != IOAT_CHANSTS_ACTIVE) break; } @@ -160,9 +160,9 @@ static int __init i7300_idle_ioat_selftest(u8 *ctl, udelay(1000); chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) & - IOAT_CHANSTS_DMA_TRANSFER_STATUS; + IOAT_CHANSTS_STATUS; - if (chan_sts != IOAT_CHANSTS_DMA_TRANSFER_STATUS_DONE) { + if (chan_sts != IOAT_CHANSTS_DONE) { /* Not complete, reset the channel */ writeb(IOAT_CHANCMD_RESET, ioat_chanbase + IOAT1_CHANCMD_OFFSET); @@ -288,9 +288,9 @@ static void __exit i7300_idle_ioat_exit(void) ioat_chanbase + IOAT1_CHANCMD_OFFSET); chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) & - IOAT_CHANSTS_DMA_TRANSFER_STATUS; + IOAT_CHANSTS_STATUS; - if (chan_sts != IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE) { + if (chan_sts != IOAT_CHANSTS_ACTIVE) { writew(0, ioat_chanbase + IOAT_CHANCTRL_OFFSET); break; } @@ -298,14 +298,14 @@ static void __exit i7300_idle_ioat_exit(void) } chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) & - IOAT_CHANSTS_DMA_TRANSFER_STATUS; + IOAT_CHANSTS_STATUS; /* * We tried to reset multiple times. If IO A/T channel is still active * flag an error and return without cleanup. Memory leak is better * than random corruption in that extreme error situation. */ - if (chan_sts == IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE) { + if (chan_sts == IOAT_CHANSTS_ACTIVE) { printk(KERN_ERR I7300_PRINT "Unable to stop IO A/T channels." " Not freeing resources\n"); return; From a309218acee8606f7e235da20cc826eb06d9b0f6 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:02:01 -0700 Subject: [PATCH 48/91] ioat2,3: dynamically resize descriptor ring Increment the allocation order of the descriptor ring every time we run out of descriptors up to a maximum of allocation order specified by the module parameter 'ioat_max_alloc_order'. After each idle period decrement the allocation order to a minimum order of 'ioat_ring_alloc_order' (i.e. the default ring size, tunable as a module parameter). Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.h | 1 + drivers/dma/ioat/dma_v2.c | 215 ++++++++++++++++++++++++++++++++------ drivers/dma/ioat/dma_v2.h | 2 + 3 files changed, 187 insertions(+), 31 deletions(-) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index dbfccac3e80..d9d6a7e3cd7 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -88,6 +88,7 @@ struct ioat_chan_common { #define IOAT_RESET_PENDING 2 struct timer_list timer; #define COMPLETION_TIMEOUT msecs_to_jiffies(100) + #define IDLE_TIMEOUT msecs_to_jiffies(2000) #define RESET_DELAY msecs_to_jiffies(100) struct ioatdma_device *device; dma_addr_t completion_dma; diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 72e59a0d0f2..460b7730133 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -43,6 +43,10 @@ static int ioat_ring_alloc_order = 8; module_param(ioat_ring_alloc_order, int, 0644); MODULE_PARM_DESC(ioat_ring_alloc_order, "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); +static int ioat_ring_max_alloc_order = IOAT_MAX_ORDER; +module_param(ioat_ring_max_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_max_alloc_order, + "ioat2+: upper limit for dynamic ring resizing (default: n=16)"); static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) { @@ -168,6 +172,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", __func__); clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); } } @@ -253,6 +258,8 @@ static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) __restart_chan(ioat); } +static bool reshape_ring(struct ioat2_dma_chan *ioat, int order); + static void ioat2_timer_event(unsigned long data) { struct ioat2_dma_chan *ioat = (void *) data; @@ -289,6 +296,23 @@ static void ioat2_timer_event(unsigned long data) mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); } spin_unlock_bh(&ioat->ring_lock); + } else { + u16 active; + + /* if the ring is idle, empty, and oversized try to step + * down the size + */ + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + if (active == 0 && ioat->alloc_order > ioat_get_alloc_order()) + reshape_ring(ioat, ioat->alloc_order-1); + spin_unlock_bh(&ioat->ring_lock); + + /* keep shrinking until we get back to our minimum + * default size + */ + if (ioat->alloc_order > ioat_get_alloc_order()) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); } spin_unlock_bh(&chan->cleanup_lock); } @@ -362,7 +386,7 @@ static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) return cookie; } -static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan) +static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t flags) { struct ioat_dma_descriptor *hw; struct ioat_ring_ent *desc; @@ -370,12 +394,12 @@ static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan) dma_addr_t phys; dma = to_ioatdma_device(chan->device); - hw = pci_pool_alloc(dma->dma_pool, GFP_KERNEL, &phys); + hw = pci_pool_alloc(dma->dma_pool, flags, &phys); if (!hw) return NULL; memset(hw, 0, sizeof(*hw)); - desc = kzalloc(sizeof(*desc), GFP_KERNEL); + desc = kzalloc(sizeof(*desc), flags); if (!desc) { pci_pool_free(dma->dma_pool, hw, phys); return NULL; @@ -397,6 +421,42 @@ static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *cha kfree(desc); } +static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) +{ + struct ioat_ring_ent **ring; + int descs = 1 << order; + int i; + + if (order > ioat_get_max_alloc_order()) + return NULL; + + /* allocate the array to hold the software ring */ + ring = kcalloc(descs, sizeof(*ring), flags); + if (!ring) + return NULL; + for (i = 0; i < descs; i++) { + ring[i] = ioat2_alloc_ring_ent(c, flags); + if (!ring[i]) { + while (i--) + ioat2_free_ring_ent(ring[i], c); + kfree(ring); + return NULL; + } + set_desc_id(ring[i], i); + } + + /* link descs */ + for (i = 0; i < descs-1; i++) { + struct ioat_ring_ent *next = ring[i+1]; + struct ioat_dma_descriptor *hw = ring[i]->hw; + + hw->next = next->txd.phys; + } + ring[i]->hw->next = ring[0]->txd.phys; + + return ring; +} + /* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring * @chan: channel to be initialized */ @@ -406,8 +466,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) struct ioat_chan_common *chan = &ioat->base; struct ioat_ring_ent **ring; u32 chanerr; - int descs; - int i; + int order; /* have we already been set up? */ if (ioat->ring) @@ -435,32 +494,10 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) writel(((u64) chan->completion_dma) >> 32, chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); - ioat->alloc_order = ioat_get_alloc_order(); - descs = 1 << ioat->alloc_order; - - /* allocate the array to hold the software ring */ - ring = kcalloc(descs, sizeof(*ring), GFP_KERNEL); + order = ioat_get_alloc_order(); + ring = ioat2_alloc_ring(c, order, GFP_KERNEL); if (!ring) return -ENOMEM; - for (i = 0; i < descs; i++) { - ring[i] = ioat2_alloc_ring_ent(c); - if (!ring[i]) { - while (i--) - ioat2_free_ring_ent(ring[i], c); - kfree(ring); - return -ENOMEM; - } - set_desc_id(ring[i], i); - } - - /* link descs */ - for (i = 0; i < descs-1; i++) { - struct ioat_ring_ent *next = ring[i+1]; - struct ioat_dma_descriptor *hw = ring[i]->hw; - - hw->next = next->txd.phys; - } - ring[i]->hw->next = ring[0]->txd.phys; spin_lock_bh(&ioat->ring_lock); ioat->ring = ring; @@ -468,12 +505,120 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) ioat->issued = 0; ioat->tail = 0; ioat->pending = 0; + ioat->alloc_order = order; spin_unlock_bh(&ioat->ring_lock); tasklet_enable(&chan->cleanup_task); ioat2_start_null_desc(ioat); - return descs; + return 1 << ioat->alloc_order; +} + +static bool reshape_ring(struct ioat2_dma_chan *ioat, int order) +{ + /* reshape differs from normal ring allocation in that we want + * to allocate a new software ring while only + * extending/truncating the hardware ring + */ + struct ioat_chan_common *chan = &ioat->base; + struct dma_chan *c = &chan->common; + const u16 curr_size = ioat2_ring_mask(ioat) + 1; + const u16 active = ioat2_ring_active(ioat); + const u16 new_size = 1 << order; + struct ioat_ring_ent **ring; + u16 i; + + if (order > ioat_get_max_alloc_order()) + return false; + + /* double check that we have at least 1 free descriptor */ + if (active == curr_size) + return false; + + /* when shrinking, verify that we can hold the current active + * set in the new ring + */ + if (active >= new_size) + return false; + + /* allocate the array to hold the software ring */ + ring = kcalloc(new_size, sizeof(*ring), GFP_NOWAIT); + if (!ring) + return false; + + /* allocate/trim descriptors as needed */ + if (new_size > curr_size) { + /* copy current descriptors to the new ring */ + for (i = 0; i < curr_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* add new descriptors to the ring */ + for (i = curr_size; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat2_alloc_ring_ent(c, GFP_NOWAIT); + if (!ring[new_idx]) { + while (i--) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ioat2_free_ring_ent(ring[new_idx], c); + } + kfree(ring); + return false; + } + set_desc_id(ring[new_idx], new_idx); + } + + /* hw link new descriptors */ + for (i = curr_size-1; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + struct ioat_ring_ent *next = ring[(new_idx+1) & (new_size-1)]; + struct ioat_dma_descriptor *hw = ring[new_idx]->hw; + + hw->next = next->txd.phys; + } + } else { + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *next; + + /* copy current descriptors to the new ring, dropping the + * removed descriptors + */ + for (i = 0; i < new_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* free deleted descriptors */ + for (i = new_size; i < curr_size; i++) { + struct ioat_ring_ent *ent; + + ent = ioat2_get_ring_ent(ioat, ioat->tail+i); + ioat2_free_ring_ent(ent, c); + } + + /* fix up hardware ring */ + hw = ring[(ioat->tail+new_size-1) & (new_size-1)]->hw; + next = ring[(ioat->tail+new_size) & (new_size-1)]; + hw->next = next->txd.phys; + } + + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, new_size); + + kfree(ioat->ring); + ioat->ring = ring; + ioat->alloc_order = order; + + return true; } /** @@ -487,7 +632,15 @@ static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_d struct ioat_chan_common *chan = &ioat->base; spin_lock_bh(&ioat->ring_lock); - if (unlikely(ioat2_ring_space(ioat) < num_descs)) { + /* never allow the last descriptor to be consumed, we need at + * least one free at all times to allow for on-the-fly ring + * resizing. + */ + while (unlikely(ioat2_ring_space(ioat) <= num_descs)) { + if (reshape_ring(ioat, ioat->alloc_order + 1) && + ioat2_ring_space(ioat) > num_descs) + break; + if (printk_ratelimit()) dev_dbg(to_dev(chan), "%s: ring full! num_descs: %d (%x:%x:%x)\n", diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index 73b04a2eb4b..9baa3d6065f 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -37,6 +37,8 @@ extern int ioat_pending_level; #define IOAT_MAX_ORDER 16 #define ioat_get_alloc_order() \ (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) +#define ioat_get_max_alloc_order() \ + (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER)) /* struct ioat2_dma_chan - ioat v2 / v3 channel attributes * @base: common ioat channel parameters From 4b652f0db3be891c7b76b109c3b55003b920fc96 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:02:15 -0700 Subject: [PATCH 49/91] net_dma: poll for a descriptor after allocation failure Handle descriptor allocation failures by polling for a descriptor. The driver will force forward progress when polled. In the best case this polling interval will be the time it takes for one dma memcpy transaction to complete. In the worst case, channel hang, we will need to wait 100ms for the cleanup watchdog to fire (ioatdma driver). Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/iovlock.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c index 9f6fe46a9b8..c0a272c7368 100644 --- a/drivers/dma/iovlock.c +++ b/drivers/dma/iovlock.c @@ -183,6 +183,11 @@ dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov, iov_byte_offset, kdata, copy); + /* poll for a descriptor slot */ + if (unlikely(dma_cookie < 0)) { + dma_async_issue_pending(chan); + continue; + } len -= copy; iov[iovec_idx].iov_len -= copy; @@ -248,6 +253,11 @@ dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov, page, offset, copy); + /* poll for a descriptor slot */ + if (unlikely(dma_cookie < 0)) { + dma_async_issue_pending(chan); + continue; + } len -= copy; iov[iovec_idx].iov_len -= copy; From 0403e3827788d878163f9ef0541b748b0f88ca5d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:50 -0700 Subject: [PATCH 50/91] dmaengine: add fence support Some engines optimize operation by reading ahead in the descriptor chain such that descriptor2 may start execution before descriptor1 completes. If descriptor2 depends on the result from descriptor1 then a fence is required (on descriptor2) to disable this optimization. The async_tx api could implicitly identify dependencies via the 'depend_tx' parameter, but that would constrain cases where the dependency chain only specifies a completion order rather than a data dependency. So, provide an ASYNC_TX_FENCE to explicitly identify data dependencies. Signed-off-by: Dan Williams --- crypto/async_tx/async_memcpy.c | 7 +++-- crypto/async_tx/async_memset.c | 7 +++-- crypto/async_tx/async_pq.c | 5 +++ crypto/async_tx/async_raid6_recov.c | 47 +++++++++++++++++------------ crypto/async_tx/async_xor.c | 11 +++++-- drivers/md/raid5.c | 37 ++++++++++++++--------- include/linux/async_tx.h | 3 ++ include/linux/dmaengine.h | 3 ++ 8 files changed, 79 insertions(+), 41 deletions(-) diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index 98e15bd0dcb..b38cbb3fd52 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -52,9 +52,12 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, if (device) { dma_addr_t dma_dest, dma_src; - unsigned long dma_prep_flags; + unsigned long dma_prep_flags = 0; - dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; + if (submit->cb_fn) + dma_prep_flags |= DMA_PREP_INTERRUPT; + if (submit->flags & ASYNC_TX_FENCE) + dma_prep_flags |= DMA_PREP_FENCE; dma_dest = dma_map_page(device->dev, dest, dest_offset, len, DMA_FROM_DEVICE); diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index b896a6e5f67..a374784e332 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -49,9 +49,12 @@ async_memset(struct page *dest, int val, unsigned int offset, size_t len, if (device) { dma_addr_t dma_dest; - unsigned long dma_prep_flags; + unsigned long dma_prep_flags = 0; - dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; + if (submit->cb_fn) + dma_prep_flags |= DMA_PREP_INTERRUPT; + if (submit->flags & ASYNC_TX_FENCE) + dma_prep_flags |= DMA_PREP_FENCE; dma_dest = dma_map_page(device->dev, dest, offset, len, DMA_FROM_DEVICE); diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c index 108b21efb49..a25e290c39f 100644 --- a/crypto/async_tx/async_pq.c +++ b/crypto/async_tx/async_pq.c @@ -101,6 +101,7 @@ do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks, */ if (src_cnt > pq_src_cnt) { submit->flags &= ~ASYNC_TX_ACK; + submit->flags |= ASYNC_TX_FENCE; dma_flags |= DMA_COMPL_SKIP_DEST_UNMAP; submit->cb_fn = NULL; submit->cb_param = NULL; @@ -111,6 +112,8 @@ do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks, if (cb_fn_orig) dma_flags |= DMA_PREP_INTERRUPT; } + if (submit->flags & ASYNC_TX_FENCE) + dma_flags |= DMA_PREP_FENCE; /* Since we have clobbered the src_list we are committed * to doing this asynchronously. Drivers force forward @@ -282,6 +285,8 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks, dma_flags |= DMA_PREP_PQ_DISABLE_P; if (!Q(blocks, disks)) dma_flags |= DMA_PREP_PQ_DISABLE_Q; + if (submit->flags & ASYNC_TX_FENCE) + dma_flags |= DMA_PREP_FENCE; for (i = 0; i < disks; i++) if (likely(blocks[i])) { BUG_ON(is_raid6_zero_block(blocks[i])); diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c index 0c14d48c989..822a42d1006 100644 --- a/crypto/async_tx/async_raid6_recov.c +++ b/crypto/async_tx/async_raid6_recov.c @@ -44,6 +44,8 @@ async_sum_product(struct page *dest, struct page **srcs, unsigned char *coef, struct dma_async_tx_descriptor *tx; enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + if (submit->flags & ASYNC_TX_FENCE) + dma_flags |= DMA_PREP_FENCE; dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); dma_src[0] = dma_map_page(dev, srcs[0], 0, len, DMA_TO_DEVICE); dma_src[1] = dma_map_page(dev, srcs[1], 0, len, DMA_TO_DEVICE); @@ -89,6 +91,8 @@ async_mult(struct page *dest, struct page *src, u8 coef, size_t len, struct dma_async_tx_descriptor *tx; enum dma_ctrl_flags dma_flags = DMA_PREP_PQ_DISABLE_P; + if (submit->flags & ASYNC_TX_FENCE) + dma_flags |= DMA_PREP_FENCE; dma_dest[1] = dma_map_page(dev, dest, 0, len, DMA_BIDIRECTIONAL); dma_src[0] = dma_map_page(dev, src, 0, len, DMA_TO_DEVICE); tx = dma->device_prep_dma_pq(chan, dma_dest, dma_src, 1, &coef, @@ -138,7 +142,7 @@ __2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks, srcs[1] = q; coef[0] = raid6_gfexi[failb-faila]; coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_sum_product(b, srcs, coef, bytes, submit); /* Dy = P+Pxy+Dx */ @@ -188,23 +192,23 @@ __2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks, dp = blocks[faila]; dq = blocks[failb]; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_memcpy(dp, g, 0, 0, bytes, submit); - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); /* compute P + Pxy */ srcs[0] = dp; srcs[1] = p; - init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, - scribble); + init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + NULL, NULL, scribble); tx = async_xor(dp, srcs, 0, 2, bytes, submit); /* compute Q + Qxy */ srcs[0] = dq; srcs[1] = q; - init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, - scribble); + init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + NULL, NULL, scribble); tx = async_xor(dq, srcs, 0, 2, bytes, submit); /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ @@ -212,7 +216,7 @@ __2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks, srcs[1] = dq; coef[0] = raid6_gfexi[failb-faila]; coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_sum_product(dq, srcs, coef, bytes, submit); /* Dy = P+Pxy+Dx */ @@ -252,7 +256,7 @@ __2data_recov_n(int disks, size_t bytes, int faila, int failb, blocks[failb] = (void *)raid6_empty_zero_page; blocks[disks-1] = dq; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); /* Restore pointer table */ @@ -264,15 +268,15 @@ __2data_recov_n(int disks, size_t bytes, int faila, int failb, /* compute P + Pxy */ srcs[0] = dp; srcs[1] = p; - init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, - scribble); + init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + NULL, NULL, scribble); tx = async_xor(dp, srcs, 0, 2, bytes, submit); /* compute Q + Qxy */ srcs[0] = dq; srcs[1] = q; - init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, - scribble); + init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + NULL, NULL, scribble); tx = async_xor(dq, srcs, 0, 2, bytes, submit); /* Dx = A*(P+Pxy) + B*(Q+Qxy) */ @@ -280,7 +284,7 @@ __2data_recov_n(int disks, size_t bytes, int faila, int failb, srcs[1] = dq; coef[0] = raid6_gfexi[failb-faila]; coef[1] = raid6_gfinv[raid6_gfexp[faila]^raid6_gfexp[failb]]; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_sum_product(dq, srcs, coef, bytes, submit); /* Dy = P+Pxy+Dx */ @@ -407,13 +411,16 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila, int good = faila == 0 ? 1 : 0; struct page *g = blocks[good]; - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, + scribble); tx = async_memcpy(p, g, 0, 0, bytes, submit); - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, + scribble); tx = async_mult(dq, g, raid6_gfexp[good], bytes, submit); } else { - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, + scribble); tx = async_gen_syndrome(blocks, 0, disks, bytes, submit); } @@ -426,11 +433,11 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila, srcs[0] = dq; srcs[1] = q; - init_async_submit(submit, ASYNC_TX_XOR_DROP_DST, tx, NULL, NULL, - scribble); + init_async_submit(submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + NULL, NULL, scribble); tx = async_xor(dq, srcs, 0, 2, bytes, submit); - init_async_submit(submit, 0, tx, NULL, NULL, scribble); + init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble); tx = async_mult(dq, dq, coef, bytes, submit); srcs[0] = p; diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index 56b5f98da46..db279872ef3 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -69,6 +69,7 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, */ if (src_cnt > xor_src_cnt) { submit->flags &= ~ASYNC_TX_ACK; + submit->flags |= ASYNC_TX_FENCE; dma_flags = DMA_COMPL_SKIP_DEST_UNMAP; submit->cb_fn = NULL; submit->cb_param = NULL; @@ -78,7 +79,8 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list, } if (submit->cb_fn) dma_flags |= DMA_PREP_INTERRUPT; - + if (submit->flags & ASYNC_TX_FENCE) + dma_flags |= DMA_PREP_FENCE; /* Since we have clobbered the src_list we are committed * to doing this asynchronously. Drivers force forward progress * in case they can not provide a descriptor @@ -264,12 +266,15 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, dma_src = (dma_addr_t *) src_list; if (dma_src && device && src_cnt <= device->max_xor) { - unsigned long dma_prep_flags; + unsigned long dma_prep_flags = 0; int i; pr_debug("%s: (async) len: %zu\n", __func__, len); - dma_prep_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0; + if (submit->cb_fn) + dma_prep_flags |= DMA_PREP_INTERRUPT; + if (submit->flags & ASYNC_TX_FENCE) + dma_prep_flags |= DMA_PREP_FENCE; for (i = 0; i < src_cnt; i++) dma_src[i] = dma_map_page(device->dev, src_list[i], offset, len, DMA_TO_DEVICE); diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0a5cf217121..54ef8d75541 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -502,13 +502,17 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, int i; int page_offset; struct async_submit_ctl submit; + enum async_tx_flags flags = 0; if (bio->bi_sector >= sector) page_offset = (signed)(bio->bi_sector - sector) * 512; else page_offset = (signed)(sector - bio->bi_sector) * -512; - init_async_submit(&submit, 0, tx, NULL, NULL, NULL); + if (frombio) + flags |= ASYNC_TX_FENCE; + init_async_submit(&submit, flags, tx, NULL, NULL, NULL); + bio_for_each_segment(bvl, bio, i) { int len = bio_iovec_idx(bio, i)->bv_len; int clen; @@ -685,7 +689,7 @@ ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) atomic_inc(&sh->count); - init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, ops_complete_compute, sh, to_addr_conv(sh, percpu)); if (unlikely(count == 1)) tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); @@ -763,7 +767,8 @@ ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) count = set_syndrome_sources(blocks, sh); blocks[count] = NULL; /* regenerating p is not necessary */ BUG_ON(blocks[count+1] != dest); /* q should already be set */ - init_async_submit(&submit, 0, NULL, ops_complete_compute, sh, + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, to_addr_conv(sh, percpu)); tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); } else { @@ -775,8 +780,8 @@ ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) blocks[count++] = sh->dev[i].page; } - init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute, sh, + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, + NULL, ops_complete_compute, sh, to_addr_conv(sh, percpu)); tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); } @@ -837,8 +842,9 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) /* Q disk is one of the missing disks */ if (faila == syndrome_disks) { /* Missing P+Q, just recompute */ - init_async_submit(&submit, 0, NULL, ops_complete_compute, - sh, to_addr_conv(sh, percpu)); + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); return async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); } else { @@ -859,21 +865,24 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) blocks[count++] = sh->dev[i].page; } dest = sh->dev[data_target].page; - init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, - NULL, NULL, to_addr_conv(sh, percpu)); + init_async_submit(&submit, + ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, + NULL, NULL, NULL, + to_addr_conv(sh, percpu)); tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); count = set_syndrome_sources(blocks, sh); - init_async_submit(&submit, 0, tx, ops_complete_compute, - sh, to_addr_conv(sh, percpu)); + init_async_submit(&submit, ASYNC_TX_FENCE, tx, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); return async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); } } - init_async_submit(&submit, 0, NULL, ops_complete_compute, sh, - to_addr_conv(sh, percpu)); + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, ops_complete_compute, + sh, to_addr_conv(sh, percpu)); if (failb == syndrome_disks) { /* We're missing D+P. */ return async_raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, @@ -916,7 +925,7 @@ ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, xor_srcs[count++] = dev->page; } - init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, tx, + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, ops_complete_prexor, sh, to_addr_conv(sh, percpu)); tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 866e61c4e2e..a1c486a88e8 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -58,11 +58,14 @@ struct dma_chan_ref { * array. * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain + * @ASYNC_TX_FENCE: specify that the next operation in the dependency + * chain uses this operation's result as an input */ enum async_tx_flags { ASYNC_TX_XOR_ZERO_DST = (1 << 0), ASYNC_TX_XOR_DROP_DST = (1 << 1), ASYNC_TX_ACK = (1 << 2), + ASYNC_TX_FENCE = (1 << 3), }; /** diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 1012f1abcb5..4d6c1c925fd 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -87,6 +87,8 @@ enum dma_transaction_type { * @DMA_PREP_CONTINUE - indicate to a driver that it is reusing buffers as * sources that were the result of a previous operation, in the case of a PQ * operation it continues the calculation with new sources + * @DMA_PREP_FENCE - tell the driver that subsequent operations depend + * on the result of this operation */ enum dma_ctrl_flags { DMA_PREP_INTERRUPT = (1 << 0), @@ -98,6 +100,7 @@ enum dma_ctrl_flags { DMA_PREP_PQ_DISABLE_P = (1 << 6), DMA_PREP_PQ_DISABLE_Q = (1 << 7), DMA_PREP_CONTINUE = (1 << 8), + DMA_PREP_FENCE = (1 << 9), }; /** From 138f4c359d23d2ec38d18bd70dd9613ae515fe93 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:51 -0700 Subject: [PATCH 51/91] dmaengine, async_tx: add a "no channel switch" allocator Channel switching is problematic for some dmaengine drivers as the architecture precludes separating the ->prep from ->submit. In these cases the driver can select ASYNC_TX_DISABLE_CHANNEL_SWITCH to modify the async_tx allocator to only return channels that support all of the required asynchronous operations. For example MD_RAID456=y selects support for asynchronous xor, xor validate, pq, pq validate, and memcpy. When ASYNC_TX_DISABLE_CHANNEL_SWITCH=y any channel with all these capabilities is marked DMA_ASYNC_TX allowing async_tx_find_channel() to quickly locate compatible channels with the guarantee that dependency chains will remain on one channel. When ASYNC_TX_DISABLE_CHANNEL_SWITCH=n async_tx_find_channel() may select channels that lead to operation chains that need to cross channel boundaries using the async_tx channel switch capability. Signed-off-by: Dan Williams --- crypto/async_tx/async_tx.c | 4 ++++ drivers/dma/Kconfig | 4 ++++ drivers/dma/dmaengine.c | 40 ++++++++++++++++++++++++++++++++++++++ include/linux/dmaengine.h | 10 +++++++++- 4 files changed, 57 insertions(+), 1 deletion(-) diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c index 60615fedcf5..f9cdf04fe7c 100644 --- a/crypto/async_tx/async_tx.c +++ b/crypto/async_tx/async_tx.c @@ -81,6 +81,10 @@ async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx, struct dma_device *device = chan->device; struct dma_async_tx_descriptor *intr_tx = (void *) ~0; + #ifdef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH + BUG(); + #endif + /* first check to see if we can still append to depend_tx */ spin_lock_bh(&depend_tx->lock); if (depend_tx->parent && depend_tx->chan == tx->chan) { diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 912a51b5cbd..ddcd9793b25 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -17,11 +17,15 @@ if DMADEVICES comment "DMA Devices" +config ASYNC_TX_DISABLE_CHANNEL_SWITCH + bool + config INTEL_IOATDMA tristate "Intel I/OAT DMA support" depends on PCI && X86 select DMA_ENGINE select DCA + select ASYNC_TX_DISABLE_CHANNEL_SWITCH help Enable support for the Intel(R) I/OAT DMA engine present in recent Intel Xeon chipsets. diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 96598479eec..d5bc628d207 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -608,6 +608,40 @@ void dmaengine_put(void) } EXPORT_SYMBOL(dmaengine_put); +static bool device_has_all_tx_types(struct dma_device *device) +{ + /* A device that satisfies this test has channels that will never cause + * an async_tx channel switch event as all possible operation types can + * be handled. + */ + #ifdef CONFIG_ASYNC_TX_DMA + if (!dma_has_cap(DMA_INTERRUPT, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_MEMCPY) || defined(CONFIG_ASYNC_MEMCPY_MODULE) + if (!dma_has_cap(DMA_MEMCPY, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_MEMSET) || defined(CONFIG_ASYNC_MEMSET_MODULE) + if (!dma_has_cap(DMA_MEMSET, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE) + if (!dma_has_cap(DMA_XOR, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE) + if (!dma_has_cap(DMA_PQ, device->cap_mask)) + return false; + #endif + + return true; +} + static int get_dma_id(struct dma_device *device) { int rc; @@ -665,6 +699,12 @@ int dma_async_device_register(struct dma_device *device) BUG_ON(!device->device_issue_pending); BUG_ON(!device->dev); + /* note: this only matters in the + * CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH=y case + */ + if (device_has_all_tx_types(device)) + dma_cap_set(DMA_ASYNC_TX, device->cap_mask); + idr_ref = kmalloc(sizeof(*idr_ref), GFP_KERNEL); if (!idr_ref) return -ENOMEM; diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 4d6c1c925fd..86853ed7970 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -48,6 +48,9 @@ enum dma_status { /** * enum dma_transaction_type - DMA transaction types/indexes + * + * Note: The DMA_ASYNC_TX capability is not to be set by drivers. It is + * automatically set as dma devices are registered. */ enum dma_transaction_type { DMA_MEMCPY, @@ -61,6 +64,7 @@ enum dma_transaction_type { DMA_MEMCPY_CRC32C, DMA_INTERRUPT, DMA_PRIVATE, + DMA_ASYNC_TX, DMA_SLAVE, }; @@ -396,7 +400,11 @@ static inline void net_dmaengine_put(void) #ifdef CONFIG_ASYNC_TX_DMA #define async_dmaengine_get() dmaengine_get() #define async_dmaengine_put() dmaengine_put() +#ifdef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH +#define async_dma_find_channel(type) dma_find_channel(DMA_ASYNC_TX) +#else #define async_dma_find_channel(type) dma_find_channel(type) +#endif /* CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH */ #else static inline void async_dmaengine_get(void) { @@ -409,7 +417,7 @@ async_dma_find_channel(enum dma_transaction_type type) { return NULL; } -#endif +#endif /* CONFIG_ASYNC_TX_DMA */ dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest, void *src, size_t len); From 9308add6ea4fedeba37b0d7c4630a542bd34f214 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:52 -0700 Subject: [PATCH 52/91] dmaengine: cleanup unused transaction types No drivers currently implement these operation types, so they can be deleted. Signed-off-by: Dan Williams --- arch/arm/mach-iop13xx/setup.c | 7 ------- arch/arm/plat-iop/adma.c | 2 -- drivers/dma/iop-adma.c | 5 +---- include/linux/dmaengine.h | 3 --- 4 files changed, 1 insertion(+), 16 deletions(-) diff --git a/arch/arm/mach-iop13xx/setup.c b/arch/arm/mach-iop13xx/setup.c index faaef95342b..5c147fb66a0 100644 --- a/arch/arm/mach-iop13xx/setup.c +++ b/arch/arm/mach-iop13xx/setup.c @@ -477,10 +477,8 @@ void __init iop13xx_platform_init(void) plat_data = &iop13xx_adma_0_data; dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); - dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); - dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); break; case IOP13XX_INIT_ADMA_1: @@ -489,10 +487,8 @@ void __init iop13xx_platform_init(void) plat_data = &iop13xx_adma_1_data; dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); - dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); - dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); break; case IOP13XX_INIT_ADMA_2: @@ -501,13 +497,10 @@ void __init iop13xx_platform_init(void) plat_data = &iop13xx_adma_2_data; dma_cap_set(DMA_MEMCPY, plat_data->cap_mask); dma_cap_set(DMA_XOR, plat_data->cap_mask); - dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask); dma_cap_set(DMA_XOR_VAL, plat_data->cap_mask); dma_cap_set(DMA_MEMSET, plat_data->cap_mask); - dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask); dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask); dma_cap_set(DMA_PQ, plat_data->cap_mask); - dma_cap_set(DMA_PQ_UPDATE, plat_data->cap_mask); dma_cap_set(DMA_PQ_VAL, plat_data->cap_mask); break; } diff --git a/arch/arm/plat-iop/adma.c b/arch/arm/plat-iop/adma.c index da1dd0dab07..1ff6a37e893 100644 --- a/arch/arm/plat-iop/adma.c +++ b/arch/arm/plat-iop/adma.c @@ -179,7 +179,6 @@ static int __init iop3xx_adma_cap_init(void) dma_cap_set(DMA_INTERRUPT, iop3xx_dma_0_data.cap_mask); #else dma_cap_set(DMA_MEMCPY, iop3xx_dma_0_data.cap_mask); - dma_cap_set(DMA_MEMCPY_CRC32C, iop3xx_dma_0_data.cap_mask); dma_cap_set(DMA_INTERRUPT, iop3xx_dma_0_data.cap_mask); #endif @@ -188,7 +187,6 @@ static int __init iop3xx_adma_cap_init(void) dma_cap_set(DMA_INTERRUPT, iop3xx_dma_1_data.cap_mask); #else dma_cap_set(DMA_MEMCPY, iop3xx_dma_1_data.cap_mask); - dma_cap_set(DMA_MEMCPY_CRC32C, iop3xx_dma_1_data.cap_mask); dma_cap_set(DMA_INTERRUPT, iop3xx_dma_1_data.cap_mask); #endif diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 4496bc60666..cecb6d657d5 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -1256,15 +1256,12 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) } dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " - "( %s%s%s%s%s%s%s%s%s%s)\n", + "( %s%s%s%s%s%s%s)\n", dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "", - dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "", dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", - dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "", dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "", dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", - dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "", dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 86853ed7970..db23fd583f9 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -56,12 +56,9 @@ enum dma_transaction_type { DMA_MEMCPY, DMA_XOR, DMA_PQ, - DMA_DUAL_XOR, - DMA_PQ_UPDATE, DMA_XOR_VAL, DMA_PQ_VAL, DMA_MEMSET, - DMA_MEMCPY_CRC32C, DMA_INTERRUPT, DMA_PRIVATE, DMA_ASYNC_TX, From 83544ae9f3991bfc7d5e0fe9a3008cd05a8d57b7 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:53 -0700 Subject: [PATCH 53/91] dmaengine, async_tx: support alignment checks Some engines have transfer size and address alignment restrictions. Add a per-operation alignment property to struct dma_device that the async routines and dmatest can use to check alignment capabilities. Signed-off-by: Dan Williams --- crypto/async_tx/async_memcpy.c | 2 +- crypto/async_tx/async_memset.c | 2 +- crypto/async_tx/async_pq.c | 6 +++-- crypto/async_tx/async_xor.c | 5 ++-- drivers/dma/dmatest.c | 14 +++++++++++ include/linux/dmaengine.h | 44 ++++++++++++++++++++++++++++++++++ 6 files changed, 67 insertions(+), 6 deletions(-) diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c index b38cbb3fd52..0ec1fb69d4e 100644 --- a/crypto/async_tx/async_memcpy.c +++ b/crypto/async_tx/async_memcpy.c @@ -50,7 +50,7 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; - if (device) { + if (device && is_dma_copy_aligned(device, src_offset, dest_offset, len)) { dma_addr_t dma_dest, dma_src; unsigned long dma_prep_flags = 0; diff --git a/crypto/async_tx/async_memset.c b/crypto/async_tx/async_memset.c index a374784e332..58e4a8752ae 100644 --- a/crypto/async_tx/async_memset.c +++ b/crypto/async_tx/async_memset.c @@ -47,7 +47,7 @@ async_memset(struct page *dest, int val, unsigned int offset, size_t len, struct dma_device *device = chan ? chan->device : NULL; struct dma_async_tx_descriptor *tx = NULL; - if (device) { + if (device && is_dma_fill_aligned(device, offset, 0, len)) { dma_addr_t dma_dest; unsigned long dma_prep_flags = 0; diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c index a25e290c39f..b88db6d1dc6 100644 --- a/crypto/async_tx/async_pq.c +++ b/crypto/async_tx/async_pq.c @@ -211,7 +211,8 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks, if (dma_src && device && (src_cnt <= dma_maxpq(device, 0) || - dma_maxpq(device, DMA_PREP_CONTINUE) > 0)) { + dma_maxpq(device, DMA_PREP_CONTINUE) > 0) && + is_dma_pq_aligned(device, offset, 0, len)) { /* run the p+q asynchronously */ pr_debug("%s: (async) disks: %d len: %zu\n", __func__, disks, len); @@ -274,7 +275,8 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks, else if (sizeof(dma_addr_t) <= sizeof(struct page *)) dma_src = (dma_addr_t *) blocks; - if (dma_src && device && disks <= dma_maxpq(device, 0)) { + if (dma_src && device && disks <= dma_maxpq(device, 0) && + is_dma_pq_aligned(device, offset, 0, len)) { struct device *dev = device->dev; dma_addr_t *pq = &dma_src[disks-2]; int i; diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c index db279872ef3..b459a9034aa 100644 --- a/crypto/async_tx/async_xor.c +++ b/crypto/async_tx/async_xor.c @@ -193,7 +193,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset, else if (sizeof(dma_addr_t) <= sizeof(struct page *)) dma_src = (dma_addr_t *) src_list; - if (dma_src && chan) { + if (dma_src && chan && is_dma_xor_aligned(chan->device, offset, 0, len)) { /* run the xor asynchronously */ pr_debug("%s (async): len: %zu\n", __func__, len); @@ -265,7 +265,8 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, else if (sizeof(dma_addr_t) <= sizeof(struct page *)) dma_src = (dma_addr_t *) src_list; - if (dma_src && device && src_cnt <= device->max_xor) { + if (dma_src && device && src_cnt <= device->max_xor && + is_dma_xor_aligned(device, offset, 0, len)) { unsigned long dma_prep_flags = 0; int i; diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 58e49e41c7a..a3722a7384b 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -288,6 +288,7 @@ static int dmatest_func(void *data) dma_addr_t dma_dsts[dst_cnt]; struct completion cmp; unsigned long tmo = msecs_to_jiffies(3000); + u8 align = 0; total_tests++; @@ -295,6 +296,18 @@ static int dmatest_func(void *data) src_off = dmatest_random() % (test_buf_size - len + 1); dst_off = dmatest_random() % (test_buf_size - len + 1); + /* honor alignment restrictions */ + if (thread->type == DMA_MEMCPY) + align = dev->copy_align; + else if (thread->type == DMA_XOR) + align = dev->xor_align; + else if (thread->type == DMA_PQ) + align = dev->pq_align; + + len = (len >> align) << align; + src_off = (src_off >> align) << align; + dst_off = (dst_off >> align) << align; + dmatest_init_srcs(thread->srcs, src_off, len); dmatest_init_dsts(thread->dsts, dst_off, len); @@ -311,6 +324,7 @@ static int dmatest_func(void *data) DMA_BIDIRECTIONAL); } + if (thread->type == DMA_MEMCPY) tx = dev->device_prep_dma_memcpy(chan, dma_dsts[0] + dst_off, diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index db23fd583f9..835b9c7bf1c 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -245,6 +245,10 @@ struct dma_async_tx_descriptor { * @cap_mask: one or more dma_capability flags * @max_xor: maximum number of xor sources, 0 if no capability * @max_pq: maximum number of PQ sources and PQ-continue capability + * @copy_align: alignment shift for memcpy operations + * @xor_align: alignment shift for xor operations + * @pq_align: alignment shift for pq operations + * @fill_align: alignment shift for memset operations * @dev_id: unique device ID * @dev: struct device reference for dma mapping api * @device_alloc_chan_resources: allocate resources and return the @@ -271,6 +275,10 @@ struct dma_device { dma_cap_mask_t cap_mask; unsigned short max_xor; unsigned short max_pq; + u8 copy_align; + u8 xor_align; + u8 pq_align; + u8 fill_align; #define DMA_HAS_PQ_CONTINUE (1 << 15) int dev_id; @@ -314,6 +322,42 @@ struct dma_device { void (*device_issue_pending)(struct dma_chan *chan); }; +static inline bool dmaengine_check_align(u8 align, size_t off1, size_t off2, size_t len) +{ + size_t mask; + + if (!align) + return true; + mask = (1 << align) - 1; + if (mask & (off1 | off2 | len)) + return false; + return true; +} + +static inline bool is_dma_copy_aligned(struct dma_device *dev, size_t off1, + size_t off2, size_t len) +{ + return dmaengine_check_align(dev->copy_align, off1, off2, len); +} + +static inline bool is_dma_xor_aligned(struct dma_device *dev, size_t off1, + size_t off2, size_t len) +{ + return dmaengine_check_align(dev->xor_align, off1, off2, len); +} + +static inline bool is_dma_pq_aligned(struct dma_device *dev, size_t off1, + size_t off2, size_t len) +{ + return dmaengine_check_align(dev->pq_align, off1, off2, len); +} + +static inline bool is_dma_fill_aligned(struct dma_device *dev, size_t off1, + size_t off2, size_t len) +{ + return dmaengine_check_align(dev->fill_align, off1, off2, len); +} + static inline void dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue) { From 128f2d567f906d38b11d993d8d97b9b988848e26 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:53 -0700 Subject: [PATCH 54/91] ioat2+: add fence support In preparation for adding more operation types to the ioat3 path the driver needs to honor the DMA_PREP_FENCE flag. For example the async_tx api will hand xor->memcpy->xor chains to the driver with the 'fence' flag set on the first xor and the memcpy operation. This flag in turn sets the 'fence' flag in the descriptor control field telling the hardware that future descriptors in the chain depend on the result of the current descriptor, so wait for all writes to complete before starting the next operation. Note that ioat1 does not prefetch the descriptor chain, so does not require/support fenced operations. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 460b7730133..568923c5dde 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -710,6 +710,7 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, desc->txd.flags = flags; desc->len = total_len; hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE); hw->ctl_f.compl_write = 1; dump_desc_dbg(ioat, desc); /* we leave the channel locked to ensure in order submission */ From 2aec048cdc4a5a81163a42a61df903f76a27e737 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:54 -0700 Subject: [PATCH 55/91] ioat3: hardware version 3.2 register / descriptor definitions ioat3.2 adds raid5 and raid6 offload capabilities. Signed-off-by: Tom Picard Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.h | 2 +- drivers/dma/ioat/dma_v2.h | 26 ++++++- drivers/dma/ioat/hw.h | 142 +++++++++++++++++++++++++++++++++++ drivers/dma/ioat/registers.h | 17 +++++ 4 files changed, 185 insertions(+), 2 deletions(-) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index d9d6a7e3cd7..0d94e7804c1 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -155,7 +155,7 @@ ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, /** * struct ioat_desc_sw - wrapper around hardware descriptor - * @hw: hardware DMA descriptor + * @hw: hardware DMA descriptor (for memcpy) * @node: this descriptor will either be on the free list, * or attached to a transaction list (async_tx.tx_list) * @txd: the generic software descriptor for all engines diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index 9baa3d6065f..ed4bb82a283 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -114,8 +114,32 @@ static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len return num_descs; } +/** + * struct ioat_ring_ent - wrapper around hardware descriptor + * @hw: hardware DMA descriptor (for memcpy) + * @fill: hardware fill descriptor + * @xor: hardware xor descriptor + * @xor_ex: hardware xor extension descriptor + * @pq: hardware pq descriptor + * @pq_ex: hardware pq extension descriptor + * @pqu: hardware pq update descriptor + * @raw: hardware raw (un-typed) descriptor + * @txd: the generic software descriptor for all engines + * @len: total transaction length for unmap + * @id: identifier for debug + */ + struct ioat_ring_ent { - struct ioat_dma_descriptor *hw; + union { + struct ioat_dma_descriptor *hw; + struct ioat_fill_descriptor *fill; + struct ioat_xor_descriptor *xor; + struct ioat_xor_ext_descriptor *xor_ex; + struct ioat_pq_descriptor *pq; + struct ioat_pq_ext_descriptor *pq_ex; + struct ioat_pq_update_descriptor *pqu; + struct ioat_raw_descriptor *raw; + }; struct dma_async_tx_descriptor txd; size_t len; #ifdef DEBUG diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h index 7481fb13ce0..99afb12bd40 100644 --- a/drivers/dma/ioat/hw.h +++ b/drivers/dma/ioat/hw.h @@ -37,6 +37,7 @@ #define IOAT_VER_1_2 0x12 /* Version 1.2 */ #define IOAT_VER_2_0 0x20 /* Version 2.0 */ #define IOAT_VER_3_0 0x30 /* Version 3.0 */ +#define IOAT_VER_3_2 0x32 /* Version 3.2 */ struct ioat_dma_descriptor { uint32_t size; @@ -55,6 +56,7 @@ struct ioat_dma_descriptor { unsigned int dest_dca:1; unsigned int hint:1; unsigned int rsvd2:13; + #define IOAT_OP_COPY 0x00 unsigned int op:8; } ctl_f; }; @@ -70,4 +72,144 @@ struct ioat_dma_descriptor { }; uint64_t user2; }; + +struct ioat_fill_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int rsvd:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int rsvd2:2; + unsigned int dest_brk:1; + unsigned int bundle:1; + unsigned int rsvd4:15; + #define IOAT_OP_FILL 0x01 + unsigned int op:8; + } ctl_f; + }; + uint64_t src_data; + uint64_t dst_addr; + uint64_t next; + uint64_t rsv1; + uint64_t next_dst_addr; + uint64_t user1; + uint64_t user2; +}; + +struct ioat_xor_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int rsvd:13; + #define IOAT_OP_XOR 0x87 + #define IOAT_OP_XOR_VAL 0x88 + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t dst_addr; + uint64_t next; + uint64_t src_addr2; + uint64_t src_addr3; + uint64_t src_addr4; + uint64_t src_addr5; +}; + +struct ioat_xor_ext_descriptor { + uint64_t src_addr6; + uint64_t src_addr7; + uint64_t src_addr8; + uint64_t next; + uint64_t rsvd[4]; +}; + +struct ioat_pq_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int p_disable:1; + unsigned int q_disable:1; + unsigned int rsvd:11; + #define IOAT_OP_PQ 0x89 + #define IOAT_OP_PQ_VAL 0x8a + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t p_addr; + uint64_t next; + uint64_t src_addr2; + uint64_t src_addr3; + uint8_t coef[8]; + uint64_t q_addr; +}; + +struct ioat_pq_ext_descriptor { + uint64_t src_addr4; + uint64_t src_addr5; + uint64_t src_addr6; + uint64_t next; + uint64_t src_addr7; + uint64_t src_addr8; + uint64_t rsvd[2]; +}; + +struct ioat_pq_update_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int p_disable:1; + unsigned int q_disable:1; + unsigned int rsvd:3; + unsigned int coef:8; + #define IOAT_OP_PQ_UP 0x8b + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t p_addr; + uint64_t next; + uint64_t src_addr2; + uint64_t p_src; + uint64_t q_src; + uint64_t q_addr; +}; + +struct ioat_raw_descriptor { + uint64_t field[8]; +}; #endif diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index e4334a19538..85d04b8c563 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -64,6 +64,20 @@ #define IOAT_DEVICE_STATUS_OFFSET 0x0E /* 16-bit */ #define IOAT_DEVICE_STATUS_DEGRADED_MODE 0x0001 +#define IOAT_DEVICE_MMIO_RESTRICTED 0x0002 +#define IOAT_DEVICE_MEMORY_BYPASS 0x0004 +#define IOAT_DEVICE_ADDRESS_REMAPPING 0x0008 + +#define IOAT_DMA_CAP_OFFSET 0x10 /* 32-bit */ +#define IOAT_CAP_PAGE_BREAK 0x00000001 +#define IOAT_CAP_CRC 0x00000002 +#define IOAT_CAP_SKIP_MARKER 0x00000004 +#define IOAT_CAP_DCA 0x00000010 +#define IOAT_CAP_CRC_MOVE 0x00000020 +#define IOAT_CAP_FILL_BLOCK 0x00000040 +#define IOAT_CAP_APIC 0x00000080 +#define IOAT_CAP_XOR 0x00000100 +#define IOAT_CAP_PQ 0x00000200 #define IOAT_CHANNEL_MMIO_SIZE 0x80 /* Each Channel MMIO space is this size */ @@ -224,6 +238,9 @@ #define IOAT_CHANERR_INT_CONFIGURATION_ERR 0x2000 #define IOAT_CHANERR_SOFT_ERR 0x4000 #define IOAT_CHANERR_UNAFFILIATED_ERR 0x8000 +#define IOAT_CHANERR_XOR_P_OR_CRC_ERR 0x10000 +#define IOAT_CHANERR_XOR_Q_ERR 0x20000 +#define IOAT_CHANERR_DESCRIPTOR_COUNT_ERR 0x40000 #define IOAT_CHANERR_MASK_OFFSET 0x2C /* 32-bit Channel Error Register */ From bf40a6869c9198bdf56fe173961feb89e9f0d961 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:55 -0700 Subject: [PATCH 56/91] ioat3: split ioat3 support to its own file, add memset Up until this point the driver for Intel(R) QuickData Technology engines, specification versions 2 and 3, were mostly identical save for a few quirks. Version 3.2 hardware adds many new capabilities (like raid offload support) requiring some infrastructure that is not relevant for v2. For better code organization of the new funcionality move v3 and v3.2 support to its own file dma_v3.c, and export some routines from the base files (dma.c and dma_v2.c) that can be reused directly. The first new capability included in this code reorganization is support for v3.2 memset operations. Signed-off-by: Dan Williams --- drivers/dma/ioat/Makefile | 2 +- drivers/dma/ioat/dma.c | 11 -- drivers/dma/ioat/dma.h | 16 ++ drivers/dma/ioat/dma_v2.c | 94 +++------- drivers/dma/ioat/dma_v2.h | 13 ++ drivers/dma/ioat/dma_v3.c | 367 ++++++++++++++++++++++++++++++++++++++ drivers/dma/ioat/pci.c | 2 +- 7 files changed, 421 insertions(+), 84 deletions(-) create mode 100644 drivers/dma/ioat/dma_v3.c diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile index 205a639e84d..8997d3fb905 100644 --- a/drivers/dma/ioat/Makefile +++ b/drivers/dma/ioat/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o -ioatdma-objs := pci.o dma.o dma_v2.o dca.o +ioatdma-objs := pci.o dma.o dma_v2.o dma_v3.o dca.o diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 17a518d0386..70262c0131d 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -538,17 +538,6 @@ static void ioat1_cleanup_tasklet(unsigned long data) writew(IOAT_CHANCTRL_RUN, chan->base.reg_base + IOAT_CHANCTRL_OFFSET); } -static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, - int direction, enum dma_ctrl_flags flags, bool dst) -{ - if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || - (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) - pci_unmap_single(pdev, addr, len, direction); - else - pci_unmap_page(pdev, addr, len, direction); -} - - void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, size_t len, struct ioat_dma_descriptor *hw) { diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 0d94e7804c1..c6d58bf541d 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -60,6 +60,10 @@ * @dca: direct cache access context * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) * @enumerate_channels: hw version specific channel enumeration + * @cleanup_tasklet: select between the v2 and v3 cleanup routines + * @timer_fn: select between the v2 and v3 timer watchdog routines + * + * Note: the v3 cleanup routine supports raid operations */ struct ioatdma_device { @@ -74,6 +78,8 @@ struct ioatdma_device { struct dca_provider *dca; void (*intr_quirk)(struct ioatdma_device *device); int (*enumerate_channels)(struct ioatdma_device *device); + void (*cleanup_tasklet)(unsigned long data); + void (*timer_fn)(unsigned long data); }; struct ioat_chan_common { @@ -287,6 +293,16 @@ static inline bool is_ioat_bug(unsigned long err) IOAT_CHANERR_LENGTH_ERR)); } +static inline void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, + int direction, enum dma_ctrl_flags flags, bool dst) +{ + if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || + (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) + pci_unmap_single(pdev, addr, len, direction); + else + pci_unmap_page(pdev, addr, len, direction); +} + int __devinit ioat_probe(struct ioatdma_device *device); int __devinit ioat_register(struct ioatdma_device *device); int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca); diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 568923c5dde..7492e9165e0 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -39,7 +39,7 @@ #include "registers.h" #include "hw.h" -static int ioat_ring_alloc_order = 8; +int ioat_ring_alloc_order = 8; module_param(ioat_ring_alloc_order, int, 0644); MODULE_PARM_DESC(ioat_ring_alloc_order, "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); @@ -63,7 +63,7 @@ static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); } -static void ioat2_issue_pending(struct dma_chan *chan) +void ioat2_issue_pending(struct dma_chan *chan) { struct ioat2_dma_chan *ioat = to_ioat2_chan(chan); @@ -214,7 +214,7 @@ static void ioat2_cleanup_tasklet(unsigned long data) writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } -static void __restart_chan(struct ioat2_dma_chan *ioat) +void __ioat2_restart_chan(struct ioat2_dma_chan *ioat) { struct ioat_chan_common *chan = &ioat->base; @@ -255,11 +255,9 @@ static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) if (ioat_cleanup_preamble(chan, &phys_complete)) __cleanup(ioat, phys_complete); - __restart_chan(ioat); + __ioat2_restart_chan(ioat); } -static bool reshape_ring(struct ioat2_dma_chan *ioat, int order); - static void ioat2_timer_event(unsigned long data) { struct ioat2_dma_chan *ioat = (void *) data; @@ -321,7 +319,7 @@ static void ioat2_timer_event(unsigned long data) * ioat2_enumerate_channels - find and initialize the device's channels * @device: the device to be enumerated */ -static int ioat2_enumerate_channels(struct ioatdma_device *device) +int ioat2_enumerate_channels(struct ioatdma_device *device) { struct ioat2_dma_chan *ioat; struct device *dev = &device->pdev->dev; @@ -354,8 +352,8 @@ static int ioat2_enumerate_channels(struct ioatdma_device *device) break; ioat_init_channel(device, &ioat->base, i, - ioat2_timer_event, - ioat2_cleanup_tasklet, + device->timer_fn, + device->cleanup_tasklet, (unsigned long) ioat); ioat->xfercap_log = xfercap_log; spin_lock_init(&ioat->ring_lock); @@ -460,7 +458,7 @@ static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gf /* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring * @chan: channel to be initialized */ -static int ioat2_alloc_chan_resources(struct dma_chan *c) +int ioat2_alloc_chan_resources(struct dma_chan *c) { struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat_chan_common *chan = &ioat->base; @@ -514,7 +512,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) return 1 << ioat->alloc_order; } -static bool reshape_ring(struct ioat2_dma_chan *ioat, int order) +bool reshape_ring(struct ioat2_dma_chan *ioat, int order) { /* reshape differs from normal ring allocation in that we want * to allocate a new software ring while only @@ -627,7 +625,7 @@ static bool reshape_ring(struct ioat2_dma_chan *ioat, int order) * @ioat: ioat2,3 channel (ring) to operate on * @num_descs: allocation length */ -static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs) +int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs) { struct ioat_chan_common *chan = &ioat->base; @@ -655,9 +653,11 @@ static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_d spin_lock_bh(&chan->cleanup_lock); if (jiffies > chan->timer.expires && timer_pending(&chan->timer)) { + struct ioatdma_device *device = chan->device; + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); spin_unlock_bh(&chan->cleanup_lock); - ioat2_timer_event((unsigned long) ioat); + device->timer_fn((unsigned long) ioat); } else spin_unlock_bh(&chan->cleanup_lock); return -ENOMEM; @@ -670,7 +670,7 @@ static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_d return 0; /* with ioat->ring_lock held */ } -static struct dma_async_tx_descriptor * +struct dma_async_tx_descriptor * ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, dma_addr_t dma_src, size_t len, unsigned long flags) { @@ -722,11 +722,11 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, * ioat2_free_chan_resources - release all the descriptors * @chan: the channel to be cleaned */ -static void ioat2_free_chan_resources(struct dma_chan *c) +void ioat2_free_chan_resources(struct dma_chan *c) { struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat_chan_common *chan = &ioat->base; - struct ioatdma_device *ioatdma_device = chan->device; + struct ioatdma_device *device = chan->device; struct ioat_ring_ent *desc; const u16 total_descs = 1 << ioat->alloc_order; int descs; @@ -740,7 +740,7 @@ static void ioat2_free_chan_resources(struct dma_chan *c) tasklet_disable(&chan->cleanup_task); del_timer_sync(&chan->timer); - ioat2_cleanup(ioat); + device->cleanup_tasklet((unsigned long) ioat); /* Delay 100ms after reset to allow internal DMA logic to quiesce * before removing DMA descriptor resources. @@ -770,8 +770,7 @@ static void ioat2_free_chan_resources(struct dma_chan *c) kfree(ioat->ring); ioat->ring = NULL; ioat->alloc_order = 0; - pci_pool_free(ioatdma_device->completion_pool, - chan->completion, + pci_pool_free(device->completion_pool, chan->completion, chan->completion_dma); spin_unlock_bh(&ioat->ring_lock); @@ -781,16 +780,17 @@ static void ioat2_free_chan_resources(struct dma_chan *c) ioat->dmacount = 0; } -static enum dma_status +enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used) { struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioatdma_device *device = ioat->base.device; if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) return DMA_SUCCESS; - ioat2_cleanup(ioat); + device->cleanup_tasklet((unsigned long) ioat); return ioat_is_complete(c, cookie, done, used); } @@ -804,6 +804,8 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) int err; device->enumerate_channels = ioat2_enumerate_channels; + device->cleanup_tasklet = ioat2_cleanup_tasklet; + device->timer_fn = ioat2_timer_event; dma = &device->common; dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; dma->device_issue_pending = ioat2_issue_pending; @@ -830,53 +832,3 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) return err; } - -int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) -{ - struct pci_dev *pdev = device->pdev; - struct dma_device *dma; - struct dma_chan *c; - struct ioat_chan_common *chan; - int err; - u16 dev_id; - - device->enumerate_channels = ioat2_enumerate_channels; - dma = &device->common; - dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; - dma->device_issue_pending = ioat2_issue_pending; - dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; - dma->device_free_chan_resources = ioat2_free_chan_resources; - dma->device_is_tx_complete = ioat2_is_complete; - - /* -= IOAT ver.3 workarounds =- */ - /* Write CHANERRMSK_INT with 3E07h to mask out the errors - * that can cause stability issues for IOAT ver.3 - */ - pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); - - /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit - * (workaround for spurious config parity error after restart) - */ - pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); - if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) - pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); - - err = ioat_probe(device); - if (err) - return err; - ioat_set_tcp_copy_break(262144); - - list_for_each_entry(c, &dma->channels, device_node) { - chan = to_chan_common(c); - writel(IOAT_DMA_DCA_ANY_CPU, - chan->reg_base + IOAT_DCACTRL_OFFSET); - } - - err = ioat_register(device); - if (err) - return err; - if (dca) - device->dca = ioat3_dca_init(pdev, device->reg_base); - - return err; -} diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index ed4bb82a283..bde57ddf555 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -27,6 +27,7 @@ extern int ioat_pending_level; +extern int ioat_ring_alloc_order; /* * workaround for IOAT ver.3.0 null descriptor issue @@ -167,4 +168,16 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs); +int ioat2_enumerate_channels(struct ioatdma_device *device); +struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags); +void ioat2_issue_pending(struct dma_chan *chan); +int ioat2_alloc_chan_resources(struct dma_chan *c); +void ioat2_free_chan_resources(struct dma_chan *c); +enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used); +void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); +bool reshape_ring(struct ioat2_dma_chan *ioat, int order); #endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c new file mode 100644 index 00000000000..b223d66b97e --- /dev/null +++ b/drivers/dma/ioat/dma_v3.c @@ -0,0 +1,367 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * BSD LICENSE + * + * Copyright(c) 2004-2009 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Support routines for v3+ hardware + */ + +#include +#include +#include +#include "registers.h" +#include "hw.h" +#include "dma.h" +#include "dma_v2.h" + +static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, + struct ioat_ring_ent *desc) +{ + struct ioat_chan_common *chan = &ioat->base; + struct pci_dev *pdev = chan->device->pdev; + size_t len = desc->len; + size_t offset = len - desc->hw->size; + struct dma_async_tx_descriptor *tx = &desc->txd; + enum dma_ctrl_flags flags = tx->flags; + + switch (desc->hw->ctl_f.op) { + case IOAT_OP_COPY: + ioat_dma_unmap(chan, flags, len, desc->hw); + break; + case IOAT_OP_FILL: { + struct ioat_fill_descriptor *hw = desc->fill; + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) + ioat_unmap(pdev, hw->dst_addr - offset, len, + PCI_DMA_FROMDEVICE, flags, 1); + break; + } + default: + dev_err(&pdev->dev, "%s: unknown op type: %#x\n", + __func__, desc->hw->ctl_f.op); + } +} + + +static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent *desc; + bool seen_current = false; + u16 active; + int i; + + dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + struct dma_async_tx_descriptor *tx; + + prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + dump_desc_dbg(ioat, desc); + tx = &desc->txd; + if (tx->cookie) { + chan->completed_cookie = tx->cookie; + ioat3_dma_unmap(ioat, desc); + tx->cookie = 0; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + } + ioat->tail += i; + BUG_ON(!seen_current); /* no active descs have written a completion? */ + chan->last_completion = phys_complete; + if (ioat->head == ioat->tail) { + dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } +} + +static void ioat3_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->ring_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat3_cleanup_tasklet(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + + ioat3_cleanup(ioat); + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +static void ioat3_restart_channel(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + u32 status; + + status = ioat_chansts(chan); + if (is_ioat_active(status) || is_ioat_idle(status)) + ioat_suspend(chan); + while (is_ioat_active(status) || is_ioat_idle(status)) { + status = ioat_chansts(chan); + cpu_relax(); + } + + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + __ioat2_restart_chan(ioat); +} + +static void ioat3_timer_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&chan->cleanup_lock); + if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + unsigned long phys_complete; + u64 status; + + spin_lock_bh(&ioat->ring_lock); + status = ioat_chansts(chan); + + /* when halted due to errors check for channel + * programming errors before advancing the completion state + */ + if (is_ioat_halted(status)) { + u32 chanerr; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + BUG_ON(is_ioat_bug(chanerr)); + } + + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat3_restart_channel(ioat); + else { + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->ring_lock); + } else { + u16 active; + + /* if the ring is idle, empty, and oversized try to step + * down the size + */ + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + if (active == 0 && ioat->alloc_order > ioat_get_alloc_order()) + reshape_ring(ioat, ioat->alloc_order-1); + spin_unlock_bh(&ioat->ring_lock); + + /* keep shrinking until we get back to our minimum + * default size + */ + if (ioat->alloc_order > ioat_get_alloc_order()) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +static enum dma_status +ioat3_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; + + ioat3_cleanup(ioat); + + return ioat_is_complete(c, cookie, done, used); +} + +static struct dma_async_tx_descriptor * +ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_ring_ent *desc; + size_t total_len = len; + struct ioat_fill_descriptor *fill; + int num_descs; + u64 src_data = (0x0101010101010101ULL) * (value & 0xff); + u16 idx; + int i; + + num_descs = ioat2_xferlen_to_descs(ioat, len); + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i++) { + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + fill = desc->fill; + + fill->size = xfer_size; + fill->src_data = src_data; + fill->dst_addr = dest; + fill->ctl = 0; + fill->ctl_f.op = IOAT_OP_FILL; + + len -= xfer_size; + dest += xfer_size; + dump_desc_dbg(ioat, desc); + } + + desc->txd.flags = flags; + desc->len = total_len; + fill->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + fill->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + fill->ctl_f.compl_write = 1; + dump_desc_dbg(ioat, desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + +int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + u16 dev_id; + u32 cap; + + device->enumerate_channels = ioat2_enumerate_channels; + device->cleanup_tasklet = ioat3_cleanup_tasklet; + device->timer_fn = ioat3_timer_event; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat3_is_complete; + cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET); + if (cap & IOAT_CAP_FILL_BLOCK) { + dma_cap_set(DMA_MEMSET, dma->cap_mask); + dma->device_prep_dma_memset = ioat3_prep_memset_lock; + } + + /* -= IOAT ver.3 workarounds =- */ + /* Write CHANERRMSK_INT with 3E07h to mask out the errors + * that can cause stability issues for IOAT ver.3 + */ + pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) + pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(262144); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return 0; +} diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index c4e43226925..0f3ec6e97fe 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -36,7 +36,7 @@ #include "hw.h" MODULE_VERSION(IOAT_DMA_VERSION); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Intel Corporation"); static struct pci_device_id ioat_pci_tbl[] = { From 5669e31c5a4874f1634bc0ffba268a6e2fa0cdd2 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:56 -0700 Subject: [PATCH 57/91] ioat: add 'ioat' sysfs attributes Export driver attributes for diagnostic purposes: 'ring_size': total number of descriptors available to the engine 'ring_active': number of descriptors in-flight 'capabilities': supported operation types for this channel 'version': Intel(R) QuickData specfication revision This also allows some chattiness to be removed from the driver startup as this information is now available via sysfs. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 120 ++++++++++++++++++++++++++++++++++++-- drivers/dma/ioat/dma.h | 12 ++++ drivers/dma/ioat/dma_v2.c | 33 +++++++++++ drivers/dma/ioat/dma_v2.h | 1 + drivers/dma/ioat/dma_v3.c | 3 + drivers/dma/ioat/pci.c | 3 + 6 files changed, 166 insertions(+), 6 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 70262c0131d..cb08f810849 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -263,6 +263,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + ioat->active += desc->hw->tx_cnt; ioat->pending += desc->hw->tx_cnt; if (ioat->pending >= ioat_pending_level) __ioat1_dma_memcpy_issue_pending(ioat); @@ -611,6 +612,7 @@ static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete) chan->completed_cookie = tx->cookie; tx->cookie = 0; ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + ioat->active -= desc->hw->tx_cnt; if (tx->callback) { tx->callback(tx->callback_param); tx->callback = NULL; @@ -1028,13 +1030,8 @@ int __devinit ioat_probe(struct ioatdma_device *device) dma_cap_set(DMA_MEMCPY, dma->cap_mask); dma->dev = &pdev->dev; - dev_err(dev, "Intel(R) I/OAT DMA Engine found," - " %d channels, device version 0x%02x, driver version %s\n", - dma->chancnt, device->version, IOAT_DMA_VERSION); - if (!dma->chancnt) { - dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: " - "zero channels detected\n"); + dev_err(dev, "zero channels detected\n"); goto err_setup_interrupts; } @@ -1085,6 +1082,113 @@ static void ioat1_intr_quirk(struct ioatdma_device *device) pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); } +static ssize_t ring_size_show(struct dma_chan *c, char *page) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + + return sprintf(page, "%d\n", ioat->desccount); +} +static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); + +static ssize_t ring_active_show(struct dma_chan *c, char *page) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + + return sprintf(page, "%d\n", ioat->active); +} +static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); + +static ssize_t cap_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + + return sprintf(page, "copy%s%s%s%s%s%s\n", + dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "", + dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "", + dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "", + dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "", + dma_has_cap(DMA_MEMSET, dma->cap_mask) ? " fill" : "", + dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : ""); + +} +struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap); + +static ssize_t version_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + struct ioatdma_device *device = to_ioatdma_device(dma); + + return sprintf(page, "%d.%d\n", + device->version >> 4, device->version & 0xf); +} +struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version); + +static struct attribute *ioat1_attrs[] = { + &ring_size_attr.attr, + &ring_active_attr.attr, + &ioat_cap_attr.attr, + &ioat_version_attr.attr, + NULL, +}; + +static ssize_t +ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct ioat_sysfs_entry *entry; + struct ioat_chan_common *chan; + + entry = container_of(attr, struct ioat_sysfs_entry, attr); + chan = container_of(kobj, struct ioat_chan_common, kobj); + + if (!entry->show) + return -EIO; + return entry->show(&chan->common, page); +} + +struct sysfs_ops ioat_sysfs_ops = { + .show = ioat_attr_show, +}; + +static struct kobj_type ioat1_ktype = { + .sysfs_ops = &ioat_sysfs_ops, + .default_attrs = ioat1_attrs, +}; + +void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type) +{ + struct dma_device *dma = &device->common; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioat_chan_common *chan = to_chan_common(c); + struct kobject *parent = &c->dev->device.kobj; + int err; + + err = kobject_init_and_add(&chan->kobj, type, parent, "quickdata"); + if (err) { + dev_warn(to_dev(chan), + "sysfs init error (%d), continuing...\n", err); + kobject_put(&chan->kobj); + set_bit(IOAT_KOBJ_INIT_FAIL, &chan->state); + } + } +} + +void ioat_kobject_del(struct ioatdma_device *device) +{ + struct dma_device *dma = &device->common; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioat_chan_common *chan = to_chan_common(c); + + if (!test_bit(IOAT_KOBJ_INIT_FAIL, &chan->state)) { + kobject_del(&chan->kobj); + kobject_put(&chan->kobj); + } + } +} + int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; @@ -1107,6 +1211,8 @@ int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) err = ioat_register(device); if (err) return err; + ioat_kobject_add(device, &ioat1_ktype); + if (dca) device->dca = ioat_dca_init(pdev, device->reg_base); @@ -1119,6 +1225,8 @@ void __devexit ioat_dma_remove(struct ioatdma_device *device) ioat_disable_interrupts(device); + ioat_kobject_del(device); + dma_async_device_unregister(dma); pci_pool_destroy(device->dma_pool); diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index c6d58bf541d..c2939b28918 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -92,6 +92,7 @@ struct ioat_chan_common { #define IOAT_COMPLETION_PENDING 0 #define IOAT_COMPLETION_ACK 1 #define IOAT_RESET_PENDING 2 + #define IOAT_KOBJ_INIT_FAIL 3 struct timer_list timer; #define COMPLETION_TIMEOUT msecs_to_jiffies(100) #define IDLE_TIMEOUT msecs_to_jiffies(2000) @@ -100,8 +101,13 @@ struct ioat_chan_common { dma_addr_t completion_dma; u64 *completion; struct tasklet_struct cleanup_task; + struct kobject kobj; }; +struct ioat_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct dma_chan *, char *); +}; /** * struct ioat_dma_chan - internal representation of a DMA channel @@ -117,6 +123,7 @@ struct ioat_dma_chan { int pending; u16 desccount; + u16 active; }; static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c) @@ -319,4 +326,9 @@ void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, size_t len, struct ioat_dma_descriptor *hw); bool ioat_cleanup_preamble(struct ioat_chan_common *chan, unsigned long *phys_complete); +void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type); +void ioat_kobject_del(struct ioatdma_device *device); +extern struct sysfs_ops ioat_sysfs_ops; +extern struct ioat_sysfs_entry ioat_version_attr; +extern struct ioat_sysfs_entry ioat_cap_attr; #endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 7492e9165e0..80ce32de8d3 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -795,6 +795,36 @@ ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, return ioat_is_complete(c, cookie, done, used); } +static ssize_t ring_size_show(struct dma_chan *c, char *page) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + return sprintf(page, "%d\n", (1 << ioat->alloc_order) & ~1); +} +static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); + +static ssize_t ring_active_show(struct dma_chan *c, char *page) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + /* ...taken outside the lock, no need to be precise */ + return sprintf(page, "%d\n", ioat2_ring_active(ioat)); +} +static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); + +static struct attribute *ioat2_attrs[] = { + &ring_size_attr.attr, + &ring_active_attr.attr, + &ioat_cap_attr.attr, + &ioat_version_attr.attr, + NULL, +}; + +struct kobj_type ioat2_ktype = { + .sysfs_ops = &ioat_sysfs_ops, + .default_attrs = ioat2_attrs, +}; + int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; @@ -827,6 +857,9 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) err = ioat_register(device); if (err) return err; + + ioat_kobject_add(device, &ioat2_ktype); + if (dca) device->dca = ioat2_dca_init(pdev, device->reg_base); diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index bde57ddf555..fa030f8e1f2 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -180,4 +180,5 @@ enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used); void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); bool reshape_ring(struct ioat2_dma_chan *ioat, int order); +extern struct kobj_type ioat2_ktype; #endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index b223d66b97e..22af78ec257 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -360,6 +360,9 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) err = ioat_register(device); if (err) return err; + + ioat_kobject_add(device, &ioat2_ktype); + if (dca) device->dca = ioat3_dca_init(pdev, device->reg_base); diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 0f3ec6e97fe..626a508a4f8 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -168,6 +168,9 @@ static void __devexit ioat_remove(struct pci_dev *pdev) static int __init ioat_init_module(void) { + pr_info("%s: Intel(R) QuickData Technology Driver %s\n", + DRV_NAME, IOAT_DMA_VERSION); + return pci_register_driver(&ioat_pci_driver); } module_init(ioat_init_module); From e61dacaeb3918cd00cd642e8fb0828324ac59819 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:57 -0700 Subject: [PATCH 58/91] ioat3: enable dca for completion writes Tag completion writes for direct cache access to reduce the latency of checking for descriptor completions. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v3.c | 3 ++- drivers/dma/ioat/registers.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 22af78ec257..0913d11e09e 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -167,7 +167,8 @@ static void ioat3_cleanup_tasklet(unsigned long data) struct ioat2_dma_chan *ioat = (void *) data; ioat3_cleanup(ioat); - writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN | IOAT3_CHANCTRL_COMPL_DCA_EN, + ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } static void ioat3_restart_channel(struct ioat2_dma_chan *ioat) diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index 85d04b8c563..97d26ea6d72 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -84,6 +84,7 @@ /* DMA Channel Registers */ #define IOAT_CHANCTRL_OFFSET 0x00 /* 16-bit Channel Control Register */ #define IOAT_CHANCTRL_CHANNEL_PRIORITY_MASK 0xF000 +#define IOAT3_CHANCTRL_COMPL_DCA_EN 0x0200 #define IOAT_CHANCTRL_CHANNEL_IN_USE 0x0100 #define IOAT_CHANCTRL_DESCRIPTOR_ADDR_SNOOP_CONTROL 0x0020 #define IOAT_CHANCTRL_ERR_INT_EN 0x0010 From b094ad3be564e7cc59cca4ff0256550d3a55dd3b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:57 -0700 Subject: [PATCH 59/91] ioat3: xor support ioat3.2 adds xor offload support for up to 8 sources. It can also perform an xor-zero-sum operation to validate whether all given sources sum to zero, without writing to a destination. Xor descriptors differ from memcpy in that one operation may require multiple descriptors depending on the number of sources. When the number of sources exceeds 5 an extended descriptor is needed. These descriptors need to be accounted for when updating the DMA_COUNT register. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 2 +- drivers/dma/ioat/dma_v2.h | 3 + drivers/dma/ioat/dma_v3.c | 218 ++++++++++++++++++++++++++++++++++- drivers/dma/ioat/registers.h | 2 + 4 files changed, 222 insertions(+), 3 deletions(-) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 80ce32de8d3..ee295d48ba2 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -48,7 +48,7 @@ module_param(ioat_ring_max_alloc_order, int, 0644); MODULE_PARM_DESC(ioat_ring_max_alloc_order, "ioat2+: upper limit for dynamic ring resizing (default: n=16)"); -static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) +void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) { void * __iomem reg_base = ioat->base.reg_base; diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index fa030f8e1f2..e23027d3dcb 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -127,6 +127,7 @@ static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len * @raw: hardware raw (un-typed) descriptor * @txd: the generic software descriptor for all engines * @len: total transaction length for unmap + * @result: asynchronous result of validate operations * @id: identifier for debug */ @@ -143,6 +144,7 @@ struct ioat_ring_ent { }; struct dma_async_tx_descriptor txd; size_t len; + enum sum_check_flags *result; #ifdef DEBUG int id; #endif @@ -180,5 +182,6 @@ enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used); void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); bool reshape_ring(struct ioat2_dma_chan *ioat, int order); +void __ioat2_issue_pending(struct ioat2_dma_chan *ioat); extern struct kobj_type ioat2_ktype; #endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 0913d11e09e..957c205f91d 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -64,8 +64,33 @@ #include "dma.h" #include "dma_v2.h" +/* ioat hardware assumes at least two sources for raid operations */ +#define src_cnt_to_sw(x) ((x) + 2) +#define src_cnt_to_hw(x) ((x) - 2) + +/* provide a lookup table for setting the source address in the base or + * extended descriptor of an xor descriptor + */ +static const u8 xor_idx_to_desc __read_mostly = 0xd0; +static const u8 xor_idx_to_field[] __read_mostly = { 1, 4, 5, 6, 7, 0, 1, 2 }; + +static dma_addr_t xor_get_src(struct ioat_raw_descriptor *descs[2], int idx) +{ + struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1]; + + return raw->field[xor_idx_to_field[idx]]; +} + +static void xor_set_src(struct ioat_raw_descriptor *descs[2], + dma_addr_t addr, u32 offset, int idx) +{ + struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1]; + + raw->field[xor_idx_to_field[idx]] = addr + offset; +} + static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, - struct ioat_ring_ent *desc) + struct ioat_ring_ent *desc, int idx) { struct ioat_chan_common *chan = &ioat->base; struct pci_dev *pdev = chan->device->pdev; @@ -86,13 +111,71 @@ static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, PCI_DMA_FROMDEVICE, flags, 1); break; } + case IOAT_OP_XOR_VAL: + case IOAT_OP_XOR: { + struct ioat_xor_descriptor *xor = desc->xor; + struct ioat_ring_ent *ext; + struct ioat_xor_ext_descriptor *xor_ex = NULL; + int src_cnt = src_cnt_to_sw(xor->ctl_f.src_cnt); + struct ioat_raw_descriptor *descs[2]; + int i; + + if (src_cnt > 5) { + ext = ioat2_get_ring_ent(ioat, idx + 1); + xor_ex = ext->xor_ex; + } + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + descs[0] = (struct ioat_raw_descriptor *) xor; + descs[1] = (struct ioat_raw_descriptor *) xor_ex; + for (i = 0; i < src_cnt; i++) { + dma_addr_t src = xor_get_src(descs, i); + + ioat_unmap(pdev, src - offset, len, + PCI_DMA_TODEVICE, flags, 0); + } + + /* dest is a source in xor validate operations */ + if (xor->ctl_f.op == IOAT_OP_XOR_VAL) { + ioat_unmap(pdev, xor->dst_addr - offset, len, + PCI_DMA_TODEVICE, flags, 1); + break; + } + } + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) + ioat_unmap(pdev, xor->dst_addr - offset, len, + PCI_DMA_FROMDEVICE, flags, 1); + break; + } default: dev_err(&pdev->dev, "%s: unknown op type: %#x\n", __func__, desc->hw->ctl_f.op); } } +static bool desc_has_ext(struct ioat_ring_ent *desc) +{ + struct ioat_dma_descriptor *hw = desc->hw; + if (hw->ctl_f.op == IOAT_OP_XOR || + hw->ctl_f.op == IOAT_OP_XOR_VAL) { + struct ioat_xor_descriptor *xor = desc->xor; + + if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5) + return true; + } + + return false; +} + +/** + * __cleanup - reclaim used descriptors + * @ioat: channel (ring) to clean + * + * The difference from the dma_v2.c __cleanup() is that this routine + * handles extended descriptors and dma-unmapping raid operations. + */ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) { struct ioat_chan_common *chan = &ioat->base; @@ -114,7 +197,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) tx = &desc->txd; if (tx->cookie) { chan->completed_cookie = tx->cookie; - ioat3_dma_unmap(ioat, desc); + ioat3_dma_unmap(ioat, desc, ioat->tail + i); tx->cookie = 0; if (tx->callback) { tx->callback(tx->callback_param); @@ -124,6 +207,12 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) if (tx->phys == phys_complete) seen_current = true; + + /* skip extended descriptors */ + if (desc_has_ext(desc)) { + BUG_ON(i + 1 >= active); + i++; + } } ioat->tail += i; BUG_ON(!seen_current); /* no active descs have written a completion? */ @@ -309,6 +398,121 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value, return &desc->txd; } +static struct dma_async_tx_descriptor * +__ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, + dma_addr_t dest, dma_addr_t *src, unsigned int src_cnt, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_ring_ent *compl_desc; + struct ioat_ring_ent *desc; + struct ioat_ring_ent *ext; + size_t total_len = len; + struct ioat_xor_descriptor *xor; + struct ioat_xor_ext_descriptor *xor_ex = NULL; + struct ioat_dma_descriptor *hw; + u32 offset = 0; + int num_descs; + int with_ext; + int i; + u16 idx; + u8 op = result ? IOAT_OP_XOR_VAL : IOAT_OP_XOR; + + BUG_ON(src_cnt < 2); + + num_descs = ioat2_xferlen_to_descs(ioat, len); + /* we need 2x the number of descriptors to cover greater than 5 + * sources + */ + if (src_cnt > 5) { + with_ext = 1; + num_descs *= 2; + } else + with_ext = 0; + + /* completion writes from the raid engine may pass completion + * writes from the legacy engine, so we need one extra null + * (legacy) descriptor to ensure all completion writes arrive in + * order. + */ + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs+1) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i += 1 + with_ext) { + struct ioat_raw_descriptor *descs[2]; + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + int s; + + desc = ioat2_get_ring_ent(ioat, idx + i); + xor = desc->xor; + + /* save a branch by unconditionally retrieving the + * extended descriptor xor_set_src() knows to not write + * to it in the single descriptor case + */ + ext = ioat2_get_ring_ent(ioat, idx + i + 1); + xor_ex = ext->xor_ex; + + descs[0] = (struct ioat_raw_descriptor *) xor; + descs[1] = (struct ioat_raw_descriptor *) xor_ex; + for (s = 0; s < src_cnt; s++) + xor_set_src(descs, src[s], offset, s); + xor->size = xfer_size; + xor->dst_addr = dest + offset; + xor->ctl = 0; + xor->ctl_f.op = op; + xor->ctl_f.src_cnt = src_cnt_to_hw(src_cnt); + + len -= xfer_size; + offset += xfer_size; + dump_desc_dbg(ioat, desc); + } + + /* last xor descriptor carries the unmap parameters and fence bit */ + desc->txd.flags = flags; + desc->len = total_len; + if (result) + desc->result = result; + xor->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + + /* completion descriptor carries interrupt bit */ + compl_desc = ioat2_get_ring_ent(ioat, idx + i); + compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT; + hw = compl_desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + dump_desc_dbg(ioat, compl_desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + +static struct dma_async_tx_descriptor * +ioat3_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + return __ioat3_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags); +} + +struct dma_async_tx_descriptor * +ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src, + unsigned int src_cnt, size_t len, + enum sum_check_flags *result, unsigned long flags) +{ + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *result = 0; + + return __ioat3_prep_xor_lock(chan, result, src[0], &src[1], + src_cnt - 1, len, flags); +} + int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; @@ -333,6 +537,16 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma_cap_set(DMA_MEMSET, dma->cap_mask); dma->device_prep_dma_memset = ioat3_prep_memset_lock; } + if (cap & IOAT_CAP_XOR) { + dma->max_xor = 8; + dma->xor_align = 2; + + dma_cap_set(DMA_XOR, dma->cap_mask); + dma->device_prep_dma_xor = ioat3_prep_xor; + + dma_cap_set(DMA_XOR_VAL, dma->cap_mask); + dma->device_prep_dma_xor_val = ioat3_prep_xor_val; + } /* -= IOAT ver.3 workarounds =- */ /* Write CHANERRMSK_INT with 3E07h to mask out the errors diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h index 97d26ea6d72..63038e18ab0 100644 --- a/drivers/dma/ioat/registers.h +++ b/drivers/dma/ioat/registers.h @@ -243,6 +243,8 @@ #define IOAT_CHANERR_XOR_Q_ERR 0x20000 #define IOAT_CHANERR_DESCRIPTOR_COUNT_ERR 0x40000 +#define IOAT_CHANERR_HANDLE_MASK (IOAT_CHANERR_XOR_P_OR_CRC_ERR | IOAT_CHANERR_XOR_Q_ERR) + #define IOAT_CHANERR_MASK_OFFSET 0x2C /* 32-bit Channel Error Register */ #endif /* _IOAT_REGISTERS_H_ */ From 9de6fc717bdc574cf5faf9d46ce0f9d6265c7952 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:58 -0700 Subject: [PATCH 60/91] ioat3: xor self test This adds a hardware specific self test to be called from ioat_probe. In the ioat3 case we will have tests for all the different raid operations, while ioat1 and ioat2 will continue to just test memcpy. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 5 +- drivers/dma/ioat/dma.h | 4 +- drivers/dma/ioat/dma_v2.c | 1 + drivers/dma/ioat/dma_v3.c | 275 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 282 insertions(+), 3 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index cb08f810849..32a757be75c 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -799,7 +799,7 @@ static void __devinit ioat_dma_test_callback(void *dma_async_param) * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. * @device: device to be tested */ -static int __devinit ioat_dma_self_test(struct ioatdma_device *device) +int __devinit ioat_dma_self_test(struct ioatdma_device *device) { int i; u8 *src; @@ -1039,7 +1039,7 @@ int __devinit ioat_probe(struct ioatdma_device *device) if (err) goto err_setup_interrupts; - err = ioat_dma_self_test(device); + err = device->self_test(device); if (err) goto err_self_test; @@ -1197,6 +1197,7 @@ int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) device->intr_quirk = ioat1_intr_quirk; device->enumerate_channels = ioat1_enumerate_channels; + device->self_test = ioat_dma_self_test; dma = &device->common; dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index c2939b28918..0e37e426c72 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -62,10 +62,10 @@ * @enumerate_channels: hw version specific channel enumeration * @cleanup_tasklet: select between the v2 and v3 cleanup routines * @timer_fn: select between the v2 and v3 timer watchdog routines + * @self_test: hardware version specific self test for each supported op type * * Note: the v3 cleanup routine supports raid operations */ - struct ioatdma_device { struct pci_dev *pdev; void __iomem *reg_base; @@ -80,6 +80,7 @@ struct ioatdma_device { int (*enumerate_channels)(struct ioatdma_device *device); void (*cleanup_tasklet)(unsigned long data); void (*timer_fn)(unsigned long data); + int (*self_test)(struct ioatdma_device *device); }; struct ioat_chan_common { @@ -313,6 +314,7 @@ static inline void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, int __devinit ioat_probe(struct ioatdma_device *device); int __devinit ioat_register(struct ioatdma_device *device); int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca); +int __devinit ioat_dma_self_test(struct ioatdma_device *device); void __devexit ioat_dma_remove(struct ioatdma_device *device); struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index ee295d48ba2..12c64e1a7e3 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -836,6 +836,7 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) device->enumerate_channels = ioat2_enumerate_channels; device->cleanup_tasklet = ioat2_cleanup_tasklet; device->timer_fn = ioat2_timer_event; + device->self_test = ioat_dma_self_test; dma = &device->common; dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; dma->device_issue_pending = ioat2_issue_pending; diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 957c205f91d..927c08b0886 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -513,6 +513,280 @@ ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src, src_cnt - 1, len, flags); } +static void __devinit ioat3_dma_test_callback(void *dma_async_param) +{ + struct completion *cmp = dma_async_param; + + complete(cmp); +} + +#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */ +static int __devinit ioat_xor_val_self_test(struct ioatdma_device *device) +{ + int i, src_idx; + struct page *dest; + struct page *xor_srcs[IOAT_NUM_SRC_TEST]; + struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1]; + dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1]; + dma_addr_t dma_addr, dest_dma; + struct dma_async_tx_descriptor *tx; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u8 cmp_byte = 0; + u32 cmp_word; + u32 xor_val_result; + int err = 0; + struct completion cmp; + unsigned long tmo; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + + dev_dbg(dev, "%s\n", __func__); + + if (!dma_has_cap(DMA_XOR, dma->cap_mask)) + return 0; + + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { + xor_srcs[src_idx] = alloc_page(GFP_KERNEL); + if (!xor_srcs[src_idx]) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + } + + dest = alloc_page(GFP_KERNEL); + if (!dest) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + + /* Fill in src buffers */ + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { + u8 *ptr = page_address(xor_srcs[src_idx]); + for (i = 0; i < PAGE_SIZE; i++) + ptr[i] = (1 << src_idx); + } + + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) + cmp_byte ^= (u8) (1 << src_idx); + + cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | + (cmp_byte << 8) | cmp_byte; + + memset(page_address(dest), 0, PAGE_SIZE); + + dma_chan = container_of(dma->channels.next, struct dma_chan, + device_node); + if (dma->device_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + /* test xor */ + dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs, + IOAT_NUM_SRC_TEST, PAGE_SIZE, + DMA_PREP_INTERRUPT); + + if (!tx) { + dev_err(dev, "Self-test xor prep failed\n"); + err = -ENODEV; + goto free_resources; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test xor setup failed\n"); + err = -ENODEV; + goto free_resources; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(dev, "Self-test xor timed out\n"); + err = -ENODEV; + goto free_resources; + } + + dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { + u32 *ptr = page_address(dest); + if (ptr[i] != cmp_word) { + dev_err(dev, "Self-test xor failed compare\n"); + err = -ENODEV; + goto free_resources; + } + } + dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_TO_DEVICE); + + /* skip validate if the capability is not present */ + if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) + goto free_resources; + + /* validate the sources with the destintation page */ + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + xor_val_srcs[i] = xor_srcs[i]; + xor_val_srcs[i] = dest; + + xor_val_result = 1; + + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, + IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, + &xor_val_result, DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(dev, "Self-test zero prep failed\n"); + err = -ENODEV; + goto free_resources; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test zero setup failed\n"); + err = -ENODEV; + goto free_resources; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(dev, "Self-test validate timed out\n"); + err = -ENODEV; + goto free_resources; + } + + if (xor_val_result != 0) { + dev_err(dev, "Self-test validate failed compare\n"); + err = -ENODEV; + goto free_resources; + } + + /* skip memset if the capability is not present */ + if (!dma_has_cap(DMA_MEMSET, dma_chan->device->cap_mask)) + goto free_resources; + + /* test memset */ + dma_addr = dma_map_page(dev, dest, 0, + PAGE_SIZE, DMA_FROM_DEVICE); + tx = dma->device_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE, + DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(dev, "Self-test memset prep failed\n"); + err = -ENODEV; + goto free_resources; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test memset setup failed\n"); + err = -ENODEV; + goto free_resources; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(dev, "Self-test memset timed out\n"); + err = -ENODEV; + goto free_resources; + } + + for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) { + u32 *ptr = page_address(dest); + if (ptr[i]) { + dev_err(dev, "Self-test memset failed compare\n"); + err = -ENODEV; + goto free_resources; + } + } + + /* test for non-zero parity sum */ + xor_val_result = 0; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, + IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, + &xor_val_result, DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(dev, "Self-test 2nd zero prep failed\n"); + err = -ENODEV; + goto free_resources; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test 2nd zero setup failed\n"); + err = -ENODEV; + goto free_resources; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(dev, "Self-test 2nd validate timed out\n"); + err = -ENODEV; + goto free_resources; + } + + if (xor_val_result != SUM_CHECK_P_RESULT) { + dev_err(dev, "Self-test validate failed compare\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + dma->device_free_chan_resources(dma_chan); +out: + src_idx = IOAT_NUM_SRC_TEST; + while (src_idx--) + __free_page(xor_srcs[src_idx]); + __free_page(dest); + return err; +} + +static int __devinit ioat3_dma_self_test(struct ioatdma_device *device) +{ + int rc = ioat_dma_self_test(device); + + if (rc) + return rc; + + rc = ioat_xor_val_self_test(device); + if (rc) + return rc; + + return 0; +} + int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; @@ -526,6 +800,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) device->enumerate_channels = ioat2_enumerate_channels; device->cleanup_tasklet = ioat3_cleanup_tasklet; device->timer_fn = ioat3_timer_event; + device->self_test = ioat3_dma_self_test; dma = &device->common; dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; dma->device_issue_pending = ioat2_issue_pending; From d69d235b7da2778891640ee95efcd68075978904 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:42:59 -0700 Subject: [PATCH 61/91] ioat3: pq support ioat3.2 adds support for raid6 syndrome generation (xor sum of galois field multiplication products) using up to 8 sources. It can also perform an pq-zero-sum operation to validate whether the syndrome for a given set of sources matches a previously computed syndrome. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v3.c | 265 +++++++++++++++++++++++++++++++++++++- 1 file changed, 264 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 927c08b0886..ca2af0fa1c3 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -69,10 +69,12 @@ #define src_cnt_to_hw(x) ((x) - 2) /* provide a lookup table for setting the source address in the base or - * extended descriptor of an xor descriptor + * extended descriptor of an xor or pq descriptor */ static const u8 xor_idx_to_desc __read_mostly = 0xd0; static const u8 xor_idx_to_field[] __read_mostly = { 1, 4, 5, 6, 7, 0, 1, 2 }; +static const u8 pq_idx_to_desc __read_mostly = 0xf8; +static const u8 pq_idx_to_field[] __read_mostly = { 1, 4, 5, 0, 1, 2, 4, 5 }; static dma_addr_t xor_get_src(struct ioat_raw_descriptor *descs[2], int idx) { @@ -89,6 +91,23 @@ static void xor_set_src(struct ioat_raw_descriptor *descs[2], raw->field[xor_idx_to_field[idx]] = addr + offset; } +static dma_addr_t pq_get_src(struct ioat_raw_descriptor *descs[2], int idx) +{ + struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1]; + + return raw->field[pq_idx_to_field[idx]]; +} + +static void pq_set_src(struct ioat_raw_descriptor *descs[2], + dma_addr_t addr, u32 offset, u8 coef, int idx) +{ + struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *) descs[0]; + struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1]; + + raw->field[pq_idx_to_field[idx]] = addr + offset; + pq->coef[idx] = coef; +} + static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, struct ioat_ring_ent *desc, int idx) { @@ -148,6 +167,58 @@ static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, PCI_DMA_FROMDEVICE, flags, 1); break; } + case IOAT_OP_PQ_VAL: + case IOAT_OP_PQ: { + struct ioat_pq_descriptor *pq = desc->pq; + struct ioat_ring_ent *ext; + struct ioat_pq_ext_descriptor *pq_ex = NULL; + int src_cnt = src_cnt_to_sw(pq->ctl_f.src_cnt); + struct ioat_raw_descriptor *descs[2]; + int i; + + if (src_cnt > 3) { + ext = ioat2_get_ring_ent(ioat, idx + 1); + pq_ex = ext->pq_ex; + } + + /* in the 'continue' case don't unmap the dests as sources */ + if (dmaf_p_disabled_continue(flags)) + src_cnt--; + else if (dmaf_continue(flags)) + src_cnt -= 3; + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + descs[0] = (struct ioat_raw_descriptor *) pq; + descs[1] = (struct ioat_raw_descriptor *) pq_ex; + for (i = 0; i < src_cnt; i++) { + dma_addr_t src = pq_get_src(descs, i); + + ioat_unmap(pdev, src - offset, len, + PCI_DMA_TODEVICE, flags, 0); + } + + /* the dests are sources in pq validate operations */ + if (pq->ctl_f.op == IOAT_OP_XOR_VAL) { + if (!(flags & DMA_PREP_PQ_DISABLE_P)) + ioat_unmap(pdev, pq->p_addr - offset, + len, PCI_DMA_TODEVICE, flags, 0); + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + ioat_unmap(pdev, pq->q_addr - offset, + len, PCI_DMA_TODEVICE, flags, 0); + break; + } + } + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + if (!(flags & DMA_PREP_PQ_DISABLE_P)) + ioat_unmap(pdev, pq->p_addr - offset, len, + PCI_DMA_BIDIRECTIONAL, flags, 1); + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + ioat_unmap(pdev, pq->q_addr - offset, len, + PCI_DMA_BIDIRECTIONAL, flags, 1); + } + break; + } default: dev_err(&pdev->dev, "%s: unknown op type: %#x\n", __func__, desc->hw->ctl_f.op); @@ -164,6 +235,12 @@ static bool desc_has_ext(struct ioat_ring_ent *desc) if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5) return true; + } else if (hw->ctl_f.op == IOAT_OP_PQ || + hw->ctl_f.op == IOAT_OP_PQ_VAL) { + struct ioat_pq_descriptor *pq = desc->pq; + + if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3) + return true; } return false; @@ -513,6 +590,182 @@ ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src, src_cnt - 1, len, flags); } +static void +dump_pq_desc_dbg(struct ioat2_dma_chan *ioat, struct ioat_ring_ent *desc, struct ioat_ring_ent *ext) +{ + struct device *dev = to_dev(&ioat->base); + struct ioat_pq_descriptor *pq = desc->pq; + struct ioat_pq_ext_descriptor *pq_ex = ext ? ext->pq_ex : NULL; + struct ioat_raw_descriptor *descs[] = { (void *) pq, (void *) pq_ex }; + int src_cnt = src_cnt_to_sw(pq->ctl_f.src_cnt); + int i; + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x" + " sz: %#x ctl: %#x (op: %d int: %d compl: %d pq: '%s%s' src_cnt: %d)\n", + desc_id(desc), (unsigned long long) desc->txd.phys, + (unsigned long long) (pq_ex ? pq_ex->next : pq->next), + desc->txd.flags, pq->size, pq->ctl, pq->ctl_f.op, pq->ctl_f.int_en, + pq->ctl_f.compl_write, + pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q", + pq->ctl_f.src_cnt); + for (i = 0; i < src_cnt; i++) + dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i, + (unsigned long long) pq_get_src(descs, i), pq->coef[i]); + dev_dbg(dev, "\tP: %#llx\n", pq->p_addr); + dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr); +} + +static struct dma_async_tx_descriptor * +__ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, + const dma_addr_t *dst, const dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent *compl_desc; + struct ioat_ring_ent *desc; + struct ioat_ring_ent *ext; + size_t total_len = len; + struct ioat_pq_descriptor *pq; + struct ioat_pq_ext_descriptor *pq_ex = NULL; + struct ioat_dma_descriptor *hw; + u32 offset = 0; + int num_descs; + int with_ext; + int i, s; + u16 idx; + u8 op = result ? IOAT_OP_PQ_VAL : IOAT_OP_PQ; + + dev_dbg(to_dev(chan), "%s\n", __func__); + /* the engine requires at least two sources (we provide + * at least 1 implied source in the DMA_PREP_CONTINUE case) + */ + BUG_ON(src_cnt + dmaf_continue(flags) < 2); + + num_descs = ioat2_xferlen_to_descs(ioat, len); + /* we need 2x the number of descriptors to cover greater than 3 + * sources + */ + if (src_cnt > 3 || flags & DMA_PREP_CONTINUE) { + with_ext = 1; + num_descs *= 2; + } else + with_ext = 0; + + /* completion writes from the raid engine may pass completion + * writes from the legacy engine, so we need one extra null + * (legacy) descriptor to ensure all completion writes arrive in + * order. + */ + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs+1) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i += 1 + with_ext) { + struct ioat_raw_descriptor *descs[2]; + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + pq = desc->pq; + + /* save a branch by unconditionally retrieving the + * extended descriptor pq_set_src() knows to not write + * to it in the single descriptor case + */ + ext = ioat2_get_ring_ent(ioat, idx + i + with_ext); + pq_ex = ext->pq_ex; + + descs[0] = (struct ioat_raw_descriptor *) pq; + descs[1] = (struct ioat_raw_descriptor *) pq_ex; + + for (s = 0; s < src_cnt; s++) + pq_set_src(descs, src[s], offset, scf[s], s); + + /* see the comment for dma_maxpq in include/linux/dmaengine.h */ + if (dmaf_p_disabled_continue(flags)) + pq_set_src(descs, dst[1], offset, 1, s++); + else if (dmaf_continue(flags)) { + pq_set_src(descs, dst[0], offset, 0, s++); + pq_set_src(descs, dst[1], offset, 1, s++); + pq_set_src(descs, dst[1], offset, 0, s++); + } + pq->size = xfer_size; + pq->p_addr = dst[0] + offset; + pq->q_addr = dst[1] + offset; + pq->ctl = 0; + pq->ctl_f.op = op; + pq->ctl_f.src_cnt = src_cnt_to_hw(s); + pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P); + pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q); + + len -= xfer_size; + offset += xfer_size; + } + + /* last pq descriptor carries the unmap parameters and fence bit */ + desc->txd.flags = flags; + desc->len = total_len; + if (result) + desc->result = result; + pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + dump_pq_desc_dbg(ioat, desc, ext); + + /* completion descriptor carries interrupt bit */ + compl_desc = ioat2_get_ring_ent(ioat, idx + i); + compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT; + hw = compl_desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + dump_desc_dbg(ioat, compl_desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + +static struct dma_async_tx_descriptor * +ioat3_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + /* handle the single source multiply case from the raid6 + * recovery path + */ + if (unlikely((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1)) { + dma_addr_t single_source[2]; + unsigned char single_source_coef[2]; + + BUG_ON(flags & DMA_PREP_PQ_DISABLE_Q); + single_source[0] = src[0]; + single_source[1] = src[0]; + single_source_coef[0] = scf[0]; + single_source_coef[1] = 0; + + return __ioat3_prep_pq_lock(chan, NULL, dst, single_source, 2, + single_source_coef, len, flags); + } else + return __ioat3_prep_pq_lock(chan, NULL, dst, src, src_cnt, scf, + len, flags); +} + +struct dma_async_tx_descriptor * +ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags) +{ + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *pqres = 0; + + return __ioat3_prep_pq_lock(chan, pqres, pq, src, src_cnt, scf, len, + flags); +} + static void __devinit ioat3_dma_test_callback(void *dma_async_param) { struct completion *cmp = dma_async_param; @@ -822,6 +1075,16 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma_cap_set(DMA_XOR_VAL, dma->cap_mask); dma->device_prep_dma_xor_val = ioat3_prep_xor_val; } + if (cap & IOAT_CAP_PQ) { + dma_set_maxpq(dma, 8, 0); + dma->pq_align = 2; + + dma_cap_set(DMA_PQ, dma->cap_mask); + dma->device_prep_dma_pq = ioat3_prep_pq; + + dma_cap_set(DMA_PQ_VAL, dma->cap_mask); + dma->device_prep_dma_pq_val = ioat3_prep_pq_val; + } /* -= IOAT ver.3 workarounds =- */ /* Write CHANERRMSK_INT with 3E07h to mask out the errors From ae786624c27411c1d38823f640b39f3d97412d5a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:43:00 -0700 Subject: [PATCH 62/91] ioat3: support xor via pq descriptors If a platform advertises pq capabilities, but not xor, then use ioat3_prep_pqxor and ioat3_prep_pqxor_val to simulate xor support. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v3.c | 49 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index ca2af0fa1c3..bb57491f3fb 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -766,6 +766,44 @@ ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, flags); } +static struct dma_async_tx_descriptor * +ioat3_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + unsigned char scf[src_cnt]; + dma_addr_t pq[2]; + + memset(scf, 0, src_cnt); + flags |= DMA_PREP_PQ_DISABLE_Q; + pq[0] = dst; + pq[1] = ~0; + + return __ioat3_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len, + flags); +} + +struct dma_async_tx_descriptor * +ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src, + unsigned int src_cnt, size_t len, + enum sum_check_flags *result, unsigned long flags) +{ + unsigned char scf[src_cnt]; + dma_addr_t pq[2]; + + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *result = 0; + + memset(scf, 0, src_cnt); + flags |= DMA_PREP_PQ_DISABLE_Q; + pq[0] = src[0]; + pq[1] = ~0; + + return __ioat3_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1, scf, + len, flags); +} + static void __devinit ioat3_dma_test_callback(void *dma_async_param) { struct completion *cmp = dma_async_param; @@ -1084,6 +1122,17 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma_cap_set(DMA_PQ_VAL, dma->cap_mask); dma->device_prep_dma_pq_val = ioat3_prep_pq_val; + + if (!(cap & IOAT_CAP_XOR)) { + dma->max_xor = 8; + dma->xor_align = 2; + + dma_cap_set(DMA_XOR, dma->cap_mask); + dma->device_prep_dma_xor = ioat3_prep_pqxor; + + dma_cap_set(DMA_XOR_VAL, dma->cap_mask); + dma->device_prep_dma_xor_val = ioat3_prep_pqxor_val; + } } /* -= IOAT ver.3 workarounds =- */ From 58c8649e0e25de511c4a66ce3fa38891e2ec4e9e Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:43:00 -0700 Subject: [PATCH 63/91] ioat3: interrupt descriptor support The async_tx api uses the DMA_INTERRUPT operation type to terminate a chain of issued operations with a callback routine. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v3.c | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index bb57491f3fb..ff4afdc8e59 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -120,7 +120,8 @@ static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat, switch (desc->hw->ctl_f.op) { case IOAT_OP_COPY: - ioat_dma_unmap(chan, flags, len, desc->hw); + if (!desc->hw->ctl_f.null) /* skip 'interrupt' ops */ + ioat_dma_unmap(chan, flags, len, desc->hw); break; case IOAT_OP_FILL: { struct ioat_fill_descriptor *hw = desc->fill; @@ -804,6 +805,38 @@ ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src, len, flags); } +static struct dma_async_tx_descriptor * +ioat3_prep_interrupt_lock(struct dma_chan *c, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + u16 idx; + + if (ioat2_alloc_and_lock(&idx, ioat, 1) == 0) + desc = ioat2_get_ring_ent(ioat, idx); + else + return NULL; + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + + desc->txd.flags = flags; + desc->len = 1; + + dump_desc_dbg(ioat, desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + static void __devinit ioat3_dma_test_callback(void *dma_async_param) { struct completion *cmp = dma_async_param; @@ -1098,6 +1131,10 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; dma->device_free_chan_resources = ioat2_free_chan_resources; dma->device_is_tx_complete = ioat3_is_complete; + + dma_cap_set(DMA_INTERRUPT, dma->cap_mask); + dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock; + cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET); if (cap & IOAT_CAP_FILL_BLOCK) { dma_cap_set(DMA_MEMSET, dma->cap_mask); From b265b11fc1a0bd6ae5a7fde12e374583a52ab326 Mon Sep 17 00:00:00 2001 From: Tom Picard Date: Tue, 8 Sep 2009 17:43:01 -0700 Subject: [PATCH 64/91] ioat3: ioat3.2 pci ids for Jasper Forest Jasper Forest introduces raid offload support via ioat3.2 support. When raid offload is enabled two (out of 8 channels) will report raid5/raid6 offload capabilities. The remaining channels will only report ioat3.0 capabilities (memcpy). Signed-off-by: Tom Picard Signed-off-by: Dan Williams --- drivers/dma/ioat/pci.c | 13 +++++++++++++ include/linux/pci_ids.h | 10 ++++++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 626a508a4f8..6c1aac5b359 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -58,6 +58,19 @@ static struct pci_device_id ioat_pci_tbl[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) }, + + /* I/OAT v3.2 platforms */ + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) }, + { 0, } }; diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 0f71812d67d..2b4b8ce5325 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -2529,6 +2529,16 @@ #define PCI_DEVICE_ID_INTEL_E7525_MCH 0x359e #define PCI_DEVICE_ID_INTEL_IOAT_CNB 0x360b #define PCI_DEVICE_ID_INTEL_FBD_CNB 0x360c +#define PCI_DEVICE_ID_INTEL_IOAT_JSF0 0x3710 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF1 0x3711 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF2 0x3712 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF3 0x3713 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF4 0x3714 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF5 0x3715 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF6 0x3716 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF7 0x3717 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF8 0x3718 +#define PCI_DEVICE_ID_INTEL_IOAT_JSF9 0x3719 #define PCI_DEVICE_ID_INTEL_ICH10_0 0x3a14 #define PCI_DEVICE_ID_INTEL_ICH10_1 0x3a16 #define PCI_DEVICE_ID_INTEL_ICH10_2 0x3a18 From e3232714d465c42ac631929b990f5e35e2d8a955 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:43:02 -0700 Subject: [PATCH 65/91] ioat3: segregate raid engines The cleanup routine for the raid cases imposes extra checks for handling raid descriptors and extended descriptors. If the channel does not support raid it can avoid this extra overhead by using the ioat2 cleanup path. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 4 ++-- drivers/dma/ioat/dma_v2.h | 2 ++ drivers/dma/ioat/dma_v3.c | 25 ++++++++++++++++++------- 3 files changed, 22 insertions(+), 9 deletions(-) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 12c64e1a7e3..7bbbd83d12e 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -206,7 +206,7 @@ static void ioat2_cleanup(struct ioat2_dma_chan *ioat) spin_unlock_bh(&chan->cleanup_lock); } -static void ioat2_cleanup_tasklet(unsigned long data) +void ioat2_cleanup_tasklet(unsigned long data) { struct ioat2_dma_chan *ioat = (void *) data; @@ -258,7 +258,7 @@ static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) __ioat2_restart_chan(ioat); } -static void ioat2_timer_event(unsigned long data) +void ioat2_timer_event(unsigned long data) { struct ioat2_dma_chan *ioat = (void *) data; struct ioat_chan_common *chan = &ioat->base; diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index e23027d3dcb..246e646b190 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -183,5 +183,7 @@ enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); bool reshape_ring(struct ioat2_dma_chan *ioat, int order); void __ioat2_issue_pending(struct ioat2_dma_chan *ioat); +void ioat2_cleanup_tasklet(unsigned long data); +void ioat2_timer_event(unsigned long data); extern struct kobj_type ioat2_ktype; #endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index ff4afdc8e59..3686dddf6bf 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -1117,30 +1117,25 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) struct dma_device *dma; struct dma_chan *c; struct ioat_chan_common *chan; + bool is_raid_device = false; int err; u16 dev_id; u32 cap; device->enumerate_channels = ioat2_enumerate_channels; - device->cleanup_tasklet = ioat3_cleanup_tasklet; - device->timer_fn = ioat3_timer_event; device->self_test = ioat3_dma_self_test; dma = &device->common; dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; dma->device_issue_pending = ioat2_issue_pending; dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; dma->device_free_chan_resources = ioat2_free_chan_resources; - dma->device_is_tx_complete = ioat3_is_complete; dma_cap_set(DMA_INTERRUPT, dma->cap_mask); dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock; cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET); - if (cap & IOAT_CAP_FILL_BLOCK) { - dma_cap_set(DMA_MEMSET, dma->cap_mask); - dma->device_prep_dma_memset = ioat3_prep_memset_lock; - } if (cap & IOAT_CAP_XOR) { + is_raid_device = true; dma->max_xor = 8; dma->xor_align = 2; @@ -1151,6 +1146,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma->device_prep_dma_xor_val = ioat3_prep_xor_val; } if (cap & IOAT_CAP_PQ) { + is_raid_device = true; dma_set_maxpq(dma, 8, 0); dma->pq_align = 2; @@ -1171,6 +1167,21 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma->device_prep_dma_xor_val = ioat3_prep_pqxor_val; } } + if (is_raid_device && (cap & IOAT_CAP_FILL_BLOCK)) { + dma_cap_set(DMA_MEMSET, dma->cap_mask); + dma->device_prep_dma_memset = ioat3_prep_memset_lock; + } + + + if (is_raid_device) { + dma->device_is_tx_complete = ioat3_is_complete; + device->cleanup_tasklet = ioat3_cleanup_tasklet; + device->timer_fn = ioat3_timer_event; + } else { + dma->device_is_tx_complete = ioat2_is_complete; + device->cleanup_tasklet = ioat2_cleanup_tasklet; + device->timer_fn = ioat2_timer_event; + } /* -= IOAT ver.3 workarounds =- */ /* Write CHANERRMSK_INT with 3E07h to mask out the errors From 6506cbca6b5b36d682bd39afcbf3f575c81dddb6 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 8 Sep 2009 17:43:03 -0700 Subject: [PATCH 66/91] Add MODULE_DEVICE_TABLE() so ioatdma module is autoloaded The ioatdma module is missing aliases for the PCI devices it supports, so it is not autoloaded on boot. Add a MODULE_DEVICE_TABLE() to get these aliases. Signed-off-by: Roland Dreier Signed-off-by: Dan Williams --- drivers/dma/ioat/pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 6c1aac5b359..3b2f40e9b3b 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -73,6 +73,7 @@ static struct pci_device_id ioat_pci_tbl[] = { { 0, } }; +MODULE_DEVICE_TABLE(pci, ioat_pci_tbl); static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id); From a6417dd58d6832f123f36c6f22c63ec1ab62ce1c Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 8 Sep 2009 17:43:03 -0700 Subject: [PATCH 67/91] I/OAT: Convert to PCI_VDEVICE() Trivial cleanup to make the PCI ID table easier to read. [dan.j.williams@intel.com: extended to v3.2 devices] Signed-off-by: Roland Dreier Signed-off-by: Dan Williams --- drivers/dma/ioat/pci.c | 46 +++++++++++++++++++++--------------------- 1 file changed, 23 insertions(+), 23 deletions(-) diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index 3b2f40e9b3b..b77d3a2864a 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -41,35 +41,35 @@ MODULE_AUTHOR("Intel Corporation"); static struct pci_device_id ioat_pci_tbl[] = { /* I/OAT v1 platforms */ - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, - { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, + { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, /* I/OAT v2 platforms */ - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) }, /* I/OAT v3 platforms */ - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) }, /* I/OAT v3.2 platforms */ - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) }, { 0, } }; From e0bd0f8cb09cf3ccac1425f0f3a6705106c4d65c Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:02 -0700 Subject: [PATCH 68/91] dw_dmac: implement a private tx_list Drop dw_dmac's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Haavard Skinnemoen Signed-off-by: Dan Williams --- drivers/dma/dw_dmac.c | 19 ++++++++++--------- drivers/dma/dw_dmac_regs.h | 1 + 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 98c9a847bf5..514ef7d71bc 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -116,7 +116,7 @@ static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc) { struct dw_desc *child; - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) dma_sync_single_for_cpu(chan2parent(&dwc->chan), child->txd.phys, sizeof(child->lli), DMA_TO_DEVICE); @@ -137,11 +137,11 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) dwc_sync_desc_for_cpu(dwc, desc); spin_lock_bh(&dwc->lock); - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) dev_vdbg(chan2dev(&dwc->chan), "moving child desc %p to freelist\n", child); - list_splice_init(&desc->txd.tx_list, &dwc->free_list); + list_splice_init(&desc->tx_list, &dwc->free_list); dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); list_add(&desc->desc_node, &dwc->free_list); spin_unlock_bh(&dwc->lock); @@ -209,7 +209,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) param = txd->callback_param; dwc_sync_desc_for_cpu(dwc, desc); - list_splice_init(&txd->tx_list, &dwc->free_list); + list_splice_init(&desc->tx_list, &dwc->free_list); list_move(&desc->desc_node, &dwc->free_list); /* @@ -289,7 +289,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) /* This one is currently in progress */ return; - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) if (child->lli.llp == llp) /* Currently in progress */ return; @@ -356,7 +356,7 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) dev_printk(KERN_CRIT, chan2dev(&dwc->chan), " cookie: %d\n", bad_desc->txd.cookie); dwc_dump_lli(dwc, &bad_desc->lli); - list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node) + list_for_each_entry(child, &bad_desc->tx_list, desc_node) dwc_dump_lli(dwc, &child->lli); /* Pretend the descriptor completed successfully */ @@ -608,7 +608,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, prev->txd.phys, sizeof(prev->lli), DMA_TO_DEVICE); list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; } @@ -700,7 +700,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, sizeof(prev->lli), DMA_TO_DEVICE); list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; total_len += len; @@ -746,7 +746,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, sizeof(prev->lli), DMA_TO_DEVICE); list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; total_len += len; @@ -902,6 +902,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) break; } + INIT_LIST_HEAD(&desc->tx_list); dma_async_tx_descriptor_init(&desc->txd, chan); desc->txd.tx_submit = dwc_tx_submit; desc->txd.flags = DMA_CTRL_ACK; diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h index 13a58076703..d9a939f67f4 100644 --- a/drivers/dma/dw_dmac_regs.h +++ b/drivers/dma/dw_dmac_regs.h @@ -217,6 +217,7 @@ struct dw_desc { /* THEN values for driver housekeeping */ struct list_head desc_node; + struct list_head tx_list; struct dma_async_tx_descriptor txd; size_t len; }; From eda34234578fd822c950fd06b5c5ff7ac08b3001 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:02 -0700 Subject: [PATCH 69/91] fsldma: implement a private tx_list Drop fsldma's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Li Yang Signed-off-by: Dan Williams --- drivers/dma/fsldma.c | 16 +++++++++------- drivers/dma/fsldma.h | 1 + 2 files changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index ef87a898414..73dd7482319 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -326,7 +326,8 @@ static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable) static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) { struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan); - struct fsl_desc_sw *desc; + struct fsl_desc_sw *desc = tx_to_fsl_desc(tx); + struct fsl_desc_sw *child; unsigned long flags; dma_cookie_t cookie; @@ -334,7 +335,7 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) spin_lock_irqsave(&fsl_chan->desc_lock, flags); cookie = fsl_chan->common.cookie; - list_for_each_entry(desc, &tx->tx_list, node) { + list_for_each_entry(child, &desc->tx_list, node) { cookie++; if (cookie < 0) cookie = 1; @@ -343,8 +344,8 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) } fsl_chan->common.cookie = cookie; - append_ld_queue(fsl_chan, tx_to_fsl_desc(tx)); - list_splice_init(&tx->tx_list, fsl_chan->ld_queue.prev); + append_ld_queue(fsl_chan, desc); + list_splice_init(&desc->tx_list, fsl_chan->ld_queue.prev); spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); @@ -366,6 +367,7 @@ static struct fsl_desc_sw *fsl_dma_alloc_descriptor( desc_sw = dma_pool_alloc(fsl_chan->desc_pool, GFP_ATOMIC, &pdesc); if (desc_sw) { memset(desc_sw, 0, sizeof(struct fsl_desc_sw)); + INIT_LIST_HEAD(&desc_sw->tx_list); dma_async_tx_descriptor_init(&desc_sw->async_tx, &fsl_chan->common); desc_sw->async_tx.tx_submit = fsl_dma_tx_submit; @@ -455,7 +457,7 @@ fsl_dma_prep_interrupt(struct dma_chan *chan, unsigned long flags) new->async_tx.flags = flags; /* Insert the link descriptor to the LD ring */ - list_add_tail(&new->node, &new->async_tx.tx_list); + list_add_tail(&new->node, &new->tx_list); /* Set End-of-link to the last link descriptor of new list*/ set_ld_eol(fsl_chan, new); @@ -513,7 +515,7 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy( dma_dest += copy; /* Insert the link descriptor to the LD ring */ - list_add_tail(&new->node, &first->async_tx.tx_list); + list_add_tail(&new->node, &first->tx_list); } while (len); new->async_tx.flags = flags; /* client is in control of this ack */ @@ -528,7 +530,7 @@ fail: if (!first) return NULL; - list = &first->async_tx.tx_list; + list = &first->tx_list; list_for_each_entry_safe_reverse(new, prev, list, node) { list_del(&new->node); dma_pool_free(fsl_chan->desc_pool, new, new->async_tx.phys); diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h index dc7f2686579..4493afed53f 100644 --- a/drivers/dma/fsldma.h +++ b/drivers/dma/fsldma.h @@ -90,6 +90,7 @@ struct fsl_dma_ld_hw { struct fsl_desc_sw { struct fsl_dma_ld_hw hw; struct list_head node; + struct list_head tx_list; struct dma_async_tx_descriptor async_tx; struct list_head *ld; void *priv; From 308136d1abcb2d759bac40ed4f5d42ac4af59d8b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:02 -0700 Subject: [PATCH 70/91] iop-adma: implement a private tx_list Drop iop-adma's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Signed-off-by: Dan Williams --- arch/arm/include/asm/hardware/iop_adma.h | 2 ++ drivers/dma/iop-adma.c | 9 +++++---- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/hardware/iop_adma.h b/arch/arm/include/asm/hardware/iop_adma.h index 385c6e8cbbd..95dc133d0a7 100644 --- a/arch/arm/include/asm/hardware/iop_adma.h +++ b/arch/arm/include/asm/hardware/iop_adma.h @@ -86,6 +86,7 @@ struct iop_adma_chan { * @idx: pool index * @unmap_src_cnt: number of xor sources * @unmap_len: transaction bytecount + * @tx_list: list of descriptors that are associated with one operation * @async_tx: support for the async_tx api * @group_list: list of slots that make up a multi-descriptor transaction * for example transfer lengths larger than the supported hw max @@ -102,6 +103,7 @@ struct iop_adma_desc_slot { u16 idx; u16 unmap_src_cnt; size_t unmap_len; + struct list_head tx_list; struct dma_async_tx_descriptor async_tx; union { u32 *xor_check_result; diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 2f052265122..9f6c16f8e2b 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -370,7 +370,7 @@ retry: } alloc_tail->group_head = alloc_start; alloc_tail->async_tx.cookie = -EBUSY; - list_splice(&chain, &alloc_tail->async_tx.tx_list); + list_splice(&chain, &alloc_tail->tx_list); iop_chan->last_used = last_used; iop_desc_clear_next_desc(alloc_start); iop_desc_clear_next_desc(alloc_tail); @@ -429,7 +429,7 @@ iop_adma_tx_submit(struct dma_async_tx_descriptor *tx) old_chain_tail = list_entry(iop_chan->chain.prev, struct iop_adma_desc_slot, chain_node); - list_splice_init(&sw_desc->async_tx.tx_list, + list_splice_init(&sw_desc->tx_list, &old_chain_tail->chain_node); /* fix up the hardware chain */ @@ -496,6 +496,7 @@ static int iop_adma_alloc_chan_resources(struct dma_chan *chan) dma_async_tx_descriptor_init(&slot->async_tx, chan); slot->async_tx.tx_submit = iop_adma_tx_submit; + INIT_LIST_HEAD(&slot->tx_list); INIT_LIST_HEAD(&slot->chain_node); INIT_LIST_HEAD(&slot->slot_node); hw_desc = (char *) iop_chan->device->dma_desc_pool; @@ -1296,7 +1297,7 @@ static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan) if (sw_desc) { grp_start = sw_desc->group_head; - list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); + list_splice_init(&sw_desc->tx_list, &iop_chan->chain); async_tx_ack(&sw_desc->async_tx); iop_desc_init_memcpy(grp_start, 0); iop_desc_set_byte_count(grp_start, iop_chan, 0); @@ -1352,7 +1353,7 @@ static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan) sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); if (sw_desc) { grp_start = sw_desc->group_head; - list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); + list_splice_init(&sw_desc->tx_list, &iop_chan->chain); async_tx_ack(&sw_desc->async_tx); iop_desc_init_null_xor(grp_start, 2, 0); iop_desc_set_byte_count(grp_start, iop_chan, 0); From ea25968a32a621b02c3715d6b649f0c6ef53c24e Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:02 -0700 Subject: [PATCH 71/91] ioat: implement a private tx_list Drop ioatdma's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.c | 7 ++++--- drivers/dma/ioat/dma.h | 3 ++- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 17a518d0386..21527b89590 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -251,12 +251,12 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); /* write address into NextDescriptor field of last desc in chain */ - first = to_ioat_desc(tx->tx_list.next); + first = to_ioat_desc(desc->tx_list.next); chain_tail = to_ioat_desc(ioat->used_desc.prev); /* make descriptor updates globally visible before chaining */ wmb(); chain_tail->hw->next = first->txd.phys; - list_splice_tail_init(&tx->tx_list, &ioat->used_desc); + list_splice_tail_init(&desc->tx_list, &ioat->used_desc); dump_desc_dbg(ioat, chain_tail); dump_desc_dbg(ioat, first); @@ -297,6 +297,7 @@ ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) memset(desc, 0, sizeof(*desc)); + INIT_LIST_HEAD(&desc_sw->tx_list); dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); desc_sw->txd.tx_submit = ioat1_tx_submit; desc_sw->hw = desc; @@ -521,7 +522,7 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, desc->txd.flags = flags; desc->len = total_len; - list_splice(&chain, &desc->txd.tx_list); + list_splice(&chain, &desc->tx_list); hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); hw->ctl_f.compl_write = 1; hw->tx_cnt = tx_cnt; diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index d9d6a7e3cd7..8966fa5453a 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -157,7 +157,7 @@ ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, * struct ioat_desc_sw - wrapper around hardware descriptor * @hw: hardware DMA descriptor * @node: this descriptor will either be on the free list, - * or attached to a transaction list (async_tx.tx_list) + * or attached to a transaction list (tx_list) * @txd: the generic software descriptor for all engines * @id: identifier for debug */ @@ -165,6 +165,7 @@ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; struct list_head node; size_t len; + struct list_head tx_list; struct dma_async_tx_descriptor txd; #ifdef DEBUG int id; From 64203b67274680e95e0c2eec935a22fc94e9ecb5 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:03 -0700 Subject: [PATCH 72/91] mv_xor: implement a private tx_list Drop mv_xor's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Saeed Bishara Signed-off-by: Dan Williams --- drivers/dma/mv_xor.c | 7 ++++--- drivers/dma/mv_xor.h | 4 ++-- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 3f23eabe09f..466ab10c1ff 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -517,7 +517,7 @@ retry: } alloc_tail->group_head = alloc_start; alloc_tail->async_tx.cookie = -EBUSY; - list_splice(&chain, &alloc_tail->async_tx.tx_list); + list_splice(&chain, &alloc_tail->tx_list); mv_chan->last_used = last_used; mv_desc_clear_next_desc(alloc_start); mv_desc_clear_next_desc(alloc_tail); @@ -565,14 +565,14 @@ mv_xor_tx_submit(struct dma_async_tx_descriptor *tx) cookie = mv_desc_assign_cookie(mv_chan, sw_desc); if (list_empty(&mv_chan->chain)) - list_splice_init(&sw_desc->async_tx.tx_list, &mv_chan->chain); + list_splice_init(&sw_desc->tx_list, &mv_chan->chain); else { new_hw_chain = 0; old_chain_tail = list_entry(mv_chan->chain.prev, struct mv_xor_desc_slot, chain_node); - list_splice_init(&grp_start->async_tx.tx_list, + list_splice_init(&grp_start->tx_list, &old_chain_tail->chain_node); if (!mv_can_chain(grp_start)) @@ -632,6 +632,7 @@ static int mv_xor_alloc_chan_resources(struct dma_chan *chan) slot->async_tx.tx_submit = mv_xor_tx_submit; INIT_LIST_HEAD(&slot->chain_node); INIT_LIST_HEAD(&slot->slot_node); + INIT_LIST_HEAD(&slot->tx_list); hw_desc = (char *) mv_chan->device->dma_desc_pool; slot->async_tx.phys = (dma_addr_t) &hw_desc[idx * MV_XOR_SLOT_SIZE]; diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h index 06cafe1ef52..977b592e976 100644 --- a/drivers/dma/mv_xor.h +++ b/drivers/dma/mv_xor.h @@ -126,9 +126,8 @@ struct mv_xor_chan { * @idx: pool index * @unmap_src_cnt: number of xor sources * @unmap_len: transaction bytecount + * @tx_list: list of slots that make up a multi-descriptor transaction * @async_tx: support for the async_tx api - * @group_list: list of slots that make up a multi-descriptor transaction - * for example transfer lengths larger than the supported hw max * @xor_check_result: result of zero sum * @crc32_result: result crc calculation */ @@ -145,6 +144,7 @@ struct mv_xor_desc_slot { u16 unmap_src_cnt; u32 value; size_t unmap_len; + struct list_head tx_list; struct dma_async_tx_descriptor async_tx; union { u32 *xor_check_result; From 285a3c71640ad7101b7237b8fbaa4ead22c6551c Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:03 -0700 Subject: [PATCH 73/91] at_hdmac: implement a private tx_list Drop at_hdmac's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Nicolas Ferre Signed-off-by: Dan Williams --- drivers/dma/at_hdmac.c | 17 +++++++++-------- drivers/dma/at_hdmac_regs.h | 1 + 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 9a1e5fb412e..da4e8b710a9 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -87,6 +87,7 @@ static struct at_desc *atc_alloc_descriptor(struct dma_chan *chan, desc = dma_pool_alloc(atdma->dma_desc_pool, gfp_flags, &phys); if (desc) { memset(desc, 0, sizeof(struct at_desc)); + INIT_LIST_HEAD(&desc->tx_list); dma_async_tx_descriptor_init(&desc->txd, chan); /* txd.flags will be overwritten in prep functions */ desc->txd.flags = DMA_CTRL_ACK; @@ -150,11 +151,11 @@ static void atc_desc_put(struct at_dma_chan *atchan, struct at_desc *desc) struct at_desc *child; spin_lock_bh(&atchan->lock); - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) dev_vdbg(chan2dev(&atchan->chan_common), "moving child desc %p to freelist\n", child); - list_splice_init(&desc->txd.tx_list, &atchan->free_list); + list_splice_init(&desc->tx_list, &atchan->free_list); dev_vdbg(chan2dev(&atchan->chan_common), "moving desc %p to freelist\n", desc); list_add(&desc->desc_node, &atchan->free_list); @@ -247,7 +248,7 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) param = txd->callback_param; /* move children to free_list */ - list_splice_init(&txd->tx_list, &atchan->free_list); + list_splice_init(&desc->tx_list, &atchan->free_list); /* move myself to free_list */ list_move(&desc->desc_node, &atchan->free_list); @@ -334,7 +335,7 @@ static void atc_cleanup_descriptors(struct at_dma_chan *atchan) /* This one is currently in progress */ return; - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) if (!(child->lli.ctrla & ATC_DONE)) /* Currently in progress */ return; @@ -407,7 +408,7 @@ static void atc_handle_error(struct at_dma_chan *atchan) dev_crit(chan2dev(&atchan->chan_common), " cookie: %d\n", bad_desc->txd.cookie); atc_dump_lli(atchan, &bad_desc->lli); - list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node) + list_for_each_entry(child, &bad_desc->tx_list, desc_node) atc_dump_lli(atchan, &child->lli); /* Pretend the descriptor completed successfully */ @@ -587,7 +588,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, prev->lli.dscr = desc->txd.phys; /* insert the link descriptor to the LD ring */ list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; } @@ -687,7 +688,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, prev->lli.dscr = desc->txd.phys; /* insert the link descriptor to the LD ring */ list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; total_len += len; @@ -729,7 +730,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, prev->lli.dscr = desc->txd.phys; /* insert the link descriptor to the LD ring */ list_add_tail(&desc->desc_node, - &first->txd.tx_list); + &first->tx_list); } prev = desc; total_len += len; diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index 4c972afc49e..495457e3dc4 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -165,6 +165,7 @@ struct at_desc { struct at_lli lli; /* THEN values for driver housekeeping */ + struct list_head tx_list; struct dma_async_tx_descriptor txd; struct list_head desc_node; size_t len; From 1979b186b80449ac6574d97c254b694c8a99b703 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:03 -0700 Subject: [PATCH 74/91] txx9dmac: implement a private tx_list Drop txx9dmac's use of tx_list from struct dma_async_tx_descriptor in preparation for removal of this field. Cc: Atsushi Nemoto Signed-off-by: Dan Williams --- drivers/dma/txx9dmac.c | 24 +++++++++++------------- drivers/dma/txx9dmac.h | 1 + 2 files changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c index 88dab52926f..197c7bc3789 100644 --- a/drivers/dma/txx9dmac.c +++ b/drivers/dma/txx9dmac.c @@ -180,9 +180,8 @@ static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc) static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc) { - if (!list_empty(&desc->txd.tx_list)) - desc = list_entry(desc->txd.tx_list.prev, - struct txx9dmac_desc, desc_node); + if (!list_empty(&desc->tx_list)) + desc = list_entry(desc->tx_list.prev, typeof(*desc), desc_node); return desc; } @@ -197,6 +196,7 @@ static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc, desc = kzalloc(sizeof(*desc), flags); if (!desc) return NULL; + INIT_LIST_HEAD(&desc->tx_list); dma_async_tx_descriptor_init(&desc->txd, &dc->chan); desc->txd.tx_submit = txx9dmac_tx_submit; /* txd.flags will be overwritten in prep funcs */ @@ -245,7 +245,7 @@ static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc, struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *child; - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) dma_sync_single_for_cpu(chan2parent(&dc->chan), child->txd.phys, ddev->descsize, DMA_TO_DEVICE); @@ -267,11 +267,11 @@ static void txx9dmac_desc_put(struct txx9dmac_chan *dc, txx9dmac_sync_desc_for_cpu(dc, desc); spin_lock_bh(&dc->lock); - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) dev_vdbg(chan2dev(&dc->chan), "moving child desc %p to freelist\n", child); - list_splice_init(&desc->txd.tx_list, &dc->free_list); + list_splice_init(&desc->tx_list, &dc->free_list); dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n", desc); list_add(&desc->desc_node, &dc->free_list); @@ -429,7 +429,7 @@ txx9dmac_descriptor_complete(struct txx9dmac_chan *dc, param = txd->callback_param; txx9dmac_sync_desc_for_cpu(dc, desc); - list_splice_init(&txd->tx_list, &dc->free_list); + list_splice_init(&desc->tx_list, &dc->free_list); list_move(&desc->desc_node, &dc->free_list); if (!ds) { @@ -571,7 +571,7 @@ static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr) "Bad descriptor submitted for DMA! (cookie: %d)\n", bad_desc->txd.cookie); txx9dmac_dump_desc(dc, &bad_desc->hwdesc); - list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node) + list_for_each_entry(child, &bad_desc->tx_list, desc_node) txx9dmac_dump_desc(dc, &child->hwdesc); /* Pretend the descriptor completed successfully */ txx9dmac_descriptor_complete(dc, bad_desc); @@ -613,7 +613,7 @@ static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc) return; } - list_for_each_entry(child, &desc->txd.tx_list, desc_node) + list_for_each_entry(child, &desc->tx_list, desc_node) if (desc_read_CHAR(dc, child) == chain) { /* Currently in progress */ if (csr & TXX9_DMA_CSR_ABCHC) @@ -823,8 +823,7 @@ txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); - list_add_tail(&desc->desc_node, - &first->txd.tx_list); + list_add_tail(&desc->desc_node, &first->tx_list); } prev = desc; } @@ -919,8 +918,7 @@ txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); - list_add_tail(&desc->desc_node, - &first->txd.tx_list); + list_add_tail(&desc->desc_node, &first->tx_list); } prev = desc; } diff --git a/drivers/dma/txx9dmac.h b/drivers/dma/txx9dmac.h index c907ff01d27..365d42366b9 100644 --- a/drivers/dma/txx9dmac.h +++ b/drivers/dma/txx9dmac.h @@ -231,6 +231,7 @@ struct txx9dmac_desc { /* THEN values for driver housekeeping */ struct list_head desc_node ____cacheline_aligned; + struct list_head tx_list; struct dma_async_tx_descriptor txd; size_t len; }; From 0803172778901e24a75ab074798d98c2b7411559 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:04 -0700 Subject: [PATCH 75/91] dmaengine: kill tx_list The tx_list attribute of struct dma_async_tx_descriptor is common to most, but not all dma driver implementations. None of the upper level code (dmaengine/async_tx) uses it, so allow drivers to implement it locally if they need it. This saves sizeof(struct list_head) bytes for drivers that do not manage descriptors with a linked list (e.g.: ioatdma v2,3). Signed-off-by: Dan Williams --- drivers/dma/dmaengine.c | 1 - include/linux/dmaengine.h | 3 --- 2 files changed, 4 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 5a87384ea4f..562d182eae6 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -933,7 +933,6 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, { tx->chan = chan; spin_lock_init(&tx->lock); - INIT_LIST_HEAD(&tx->tx_list); } EXPORT_SYMBOL(dma_async_tx_descriptor_init); diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index ffefba81c81..f114bc7790b 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -180,8 +180,6 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param); * @flags: flags to augment operation preparation, control completion, and * communicate status * @phys: physical address of the descriptor - * @tx_list: driver common field for operations that require multiple - * descriptors * @chan: target channel for this operation * @tx_submit: set the prepared descriptor(s) to be executed by the engine * @callback: routine to call after this operation is complete @@ -195,7 +193,6 @@ struct dma_async_tx_descriptor { dma_cookie_t cookie; enum dma_ctrl_flags flags; /* not a 'long' to pack with cookie */ dma_addr_t phys; - struct list_head tx_list; struct dma_chan *chan; dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx); dma_async_tx_callback callback; From 162b96e63e518aa6ff029ce23de12d7f027483bf Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:53:04 -0700 Subject: [PATCH 76/91] ioat2,3: cacheline align software descriptor allocations All the necessary fields for handling an ioat2,3 ring entry can fit into one cacheline. Move ->len prior to ->txd in struct ioat_ring_ent, and move allocation of these entries to a hw-cache-aligned kmem cache to reduce the number of cachelines dirtied for descriptor management. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 5 +++-- drivers/dma/ioat/dma_v2.h | 3 ++- drivers/dma/ioat/pci.c | 16 +++++++++++++++- 3 files changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 460b7730133..fa3d6db6624 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -399,11 +399,12 @@ static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t f return NULL; memset(hw, 0, sizeof(*hw)); - desc = kzalloc(sizeof(*desc), flags); + desc = kmem_cache_alloc(ioat2_cache, flags); if (!desc) { pci_pool_free(dma->dma_pool, hw, phys); return NULL; } + memset(desc, 0, sizeof(*desc)); dma_async_tx_descriptor_init(&desc->txd, chan); desc->txd.tx_submit = ioat2_tx_submit_unlock; @@ -418,7 +419,7 @@ static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *cha dma = to_ioatdma_device(chan->device); pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); - kfree(desc); + kmem_cache_free(ioat2_cache, desc); } static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h index 9baa3d6065f..ac00adc8197 100644 --- a/drivers/dma/ioat/dma_v2.h +++ b/drivers/dma/ioat/dma_v2.h @@ -116,8 +116,8 @@ static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len struct ioat_ring_ent { struct ioat_dma_descriptor *hw; - struct dma_async_tx_descriptor txd; size_t len; + struct dma_async_tx_descriptor txd; #ifdef DEBUG int id; #endif @@ -143,4 +143,5 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +extern struct kmem_cache *ioat2_cache; #endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index c4e43226925..61086c6bbf4 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -69,6 +69,8 @@ static int ioat_dca_enabled = 1; module_param(ioat_dca_enabled, int, 0644); MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); +struct kmem_cache *ioat2_cache; + #define DRV_NAME "ioatdma" static struct pci_driver ioat_pci_driver = { @@ -168,12 +170,24 @@ static void __devexit ioat_remove(struct pci_dev *pdev) static int __init ioat_init_module(void) { - return pci_register_driver(&ioat_pci_driver); + int err; + + ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!ioat2_cache) + return -ENOMEM; + + err = pci_register_driver(&ioat_pci_driver); + if (err) + kmem_cache_destroy(ioat2_cache); + + return err; } module_init(ioat_init_module); static void __exit ioat_exit_module(void) { pci_unregister_driver(&ioat_pci_driver); + kmem_cache_destroy(ioat2_cache); } module_exit(ioat_exit_module); From e6c7ecb64e08ef346cb7062b4a5421f00bc602bd Mon Sep 17 00:00:00 2001 From: Ira Snyder Date: Tue, 8 Sep 2009 17:53:04 -0700 Subject: [PATCH 77/91] fsldma: split apart external pause and request count features When using the Freescale DMA controller in external control mode, both the request count and external pause bits need to be setup correctly. This was being done with the same function. The 83xx controller lacks the external pause feature, but has a similar feature called external start. This feature requires that the request count bits be setup correctly. Split the function into two parts, to make it possible to use the external start feature on the 83xx controller. Signed-off-by: Ira W. Snyder Signed-off-by: Dan Williams --- drivers/dma/fsldma.c | 45 ++++++++++++++++++++++++++++---------------- drivers/dma/fsldma.h | 3 ++- 2 files changed, 31 insertions(+), 17 deletions(-) diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 73dd7482319..7a0cb6064f8 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -279,29 +279,41 @@ static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size) } } +/** + * fsl_chan_set_request_count - Set DMA Request Count for external control + * @fsl_chan : Freescale DMA channel + * @size : Number of bytes to transfer in a single request + * + * The Freescale DMA channel can be controlled by the external signal DREQ#. + * The DMA request count is how many bytes are allowed to transfer before + * pausing the channel, after which a new assertion of DREQ# resumes channel + * operation. + * + * A size of 0 disables external pause control. The maximum size is 1024. + */ +static void fsl_chan_set_request_count(struct fsl_dma_chan *fsl_chan, int size) +{ + BUG_ON(size > 1024); + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) + | ((__ilog2(size) << 24) & 0x0f000000), + 32); +} + /** * fsl_chan_toggle_ext_pause - Toggle channel external pause status * @fsl_chan : Freescale DMA channel - * @size : Pause control size, 0 for disable external pause control. - * The maximum is 1024. + * @enable : 0 is disabled, 1 is enabled. * - * The Freescale DMA channel can be controlled by the external - * signal DREQ#. The pause control size is how many bytes are allowed - * to transfer before pausing the channel, after which a new assertion - * of DREQ# resumes channel operation. + * The Freescale DMA channel can be controlled by the external signal DREQ#. + * The DMA Request Count feature should be used in addition to this feature + * to set the number of bytes to transfer before pausing the channel. */ -static void fsl_chan_toggle_ext_pause(struct fsl_dma_chan *fsl_chan, int size) +static void fsl_chan_toggle_ext_pause(struct fsl_dma_chan *fsl_chan, int enable) { - if (size > 1024) - return; - - if (size) { - DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, - DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) - | ((__ilog2(size) << 24) & 0x0f000000), - 32); + if (enable) fsl_chan->feature |= FSL_DMA_CHAN_PAUSE_EXT; - } else + else fsl_chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT; } @@ -885,6 +897,7 @@ static int __devinit fsl_dma_chan_probe(struct fsl_dma_device *fdev, new_fsl_chan->toggle_ext_start = fsl_chan_toggle_ext_start; new_fsl_chan->set_src_loop_size = fsl_chan_set_src_loop_size; new_fsl_chan->set_dest_loop_size = fsl_chan_set_dest_loop_size; + new_fsl_chan->set_request_count = fsl_chan_set_request_count; } spin_lock_init(&new_fsl_chan->desc_lock); diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h index 4493afed53f..0df14cbb8ca 100644 --- a/drivers/dma/fsldma.h +++ b/drivers/dma/fsldma.h @@ -144,10 +144,11 @@ struct fsl_dma_chan { struct tasklet_struct tasklet; u32 feature; - void (*toggle_ext_pause)(struct fsl_dma_chan *fsl_chan, int size); + void (*toggle_ext_pause)(struct fsl_dma_chan *fsl_chan, int enable); void (*toggle_ext_start)(struct fsl_dma_chan *fsl_chan, int enable); void (*set_src_loop_size)(struct fsl_dma_chan *fsl_chan, int size); void (*set_dest_loop_size)(struct fsl_dma_chan *fsl_chan, int size); + void (*set_request_count)(struct fsl_dma_chan *fsl_chan, int size); }; #define to_fsl_chan(chan) container_of(chan, struct fsl_dma_chan, common) From bbea0b6e0d214ef1511b9c6ccf3af26b38f0af7d Mon Sep 17 00:00:00 2001 From: Ira Snyder Date: Tue, 8 Sep 2009 17:53:04 -0700 Subject: [PATCH 78/91] fsldma: Add DMA_SLAVE support Use the DMA_SLAVE capability of the DMAEngine API to copy/from a scatterlist into an arbitrary list of hardware address/length pairs. This allows a single DMA transaction to copy data from several different devices into a scatterlist at the same time. This also adds support to enable some controller-specific features such as external start and external pause for a DMA transaction. [dan.j.williams@intel.com: rebased on tx_list movement] Signed-off-by: Ira W. Snyder Acked-by: Li Yang Acked-by: Kumar Gala Signed-off-by: Dan Williams --- arch/powerpc/include/asm/fsldma.h | 136 ++++++++++++++++++ drivers/dma/fsldma.c | 227 ++++++++++++++++++++++++++++++ 2 files changed, 363 insertions(+) create mode 100644 arch/powerpc/include/asm/fsldma.h diff --git a/arch/powerpc/include/asm/fsldma.h b/arch/powerpc/include/asm/fsldma.h new file mode 100644 index 00000000000..a67aeed17d4 --- /dev/null +++ b/arch/powerpc/include/asm/fsldma.h @@ -0,0 +1,136 @@ +/* + * Freescale MPC83XX / MPC85XX DMA Controller + * + * Copyright (c) 2009 Ira W. Snyder + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#ifndef __ARCH_POWERPC_ASM_FSLDMA_H__ +#define __ARCH_POWERPC_ASM_FSLDMA_H__ + +#include + +/* + * Definitions for the Freescale DMA controller's DMA_SLAVE implemention + * + * The Freescale DMA_SLAVE implementation was designed to handle many-to-many + * transfers. An example usage would be an accelerated copy between two + * scatterlists. Another example use would be an accelerated copy from + * multiple non-contiguous device buffers into a single scatterlist. + * + * A DMA_SLAVE transaction is defined by a struct fsl_dma_slave. This + * structure contains a list of hardware addresses that should be copied + * to/from the scatterlist passed into device_prep_slave_sg(). The structure + * also has some fields to enable hardware-specific features. + */ + +/** + * struct fsl_dma_hw_addr + * @entry: linked list entry + * @address: the hardware address + * @length: length to transfer + * + * Holds a single physical hardware address / length pair for use + * with the DMAEngine DMA_SLAVE API. + */ +struct fsl_dma_hw_addr { + struct list_head entry; + + dma_addr_t address; + size_t length; +}; + +/** + * struct fsl_dma_slave + * @addresses: a linked list of struct fsl_dma_hw_addr structures + * @request_count: value for DMA request count + * @src_loop_size: setup and enable constant source-address DMA transfers + * @dst_loop_size: setup and enable constant destination address DMA transfers + * @external_start: enable externally started DMA transfers + * @external_pause: enable externally paused DMA transfers + * + * Holds a list of address / length pairs for use with the DMAEngine + * DMA_SLAVE API implementation for the Freescale DMA controller. + */ +struct fsl_dma_slave { + + /* List of hardware address/length pairs */ + struct list_head addresses; + + /* Support for extra controller features */ + unsigned int request_count; + unsigned int src_loop_size; + unsigned int dst_loop_size; + bool external_start; + bool external_pause; +}; + +/** + * fsl_dma_slave_append - add an address/length pair to a struct fsl_dma_slave + * @slave: the &struct fsl_dma_slave to add to + * @address: the hardware address to add + * @length: the length of bytes to transfer from @address + * + * Add a hardware address/length pair to a struct fsl_dma_slave. Returns 0 on + * success, -ERRNO otherwise. + */ +static inline int fsl_dma_slave_append(struct fsl_dma_slave *slave, + dma_addr_t address, size_t length) +{ + struct fsl_dma_hw_addr *addr; + + addr = kzalloc(sizeof(*addr), GFP_ATOMIC); + if (!addr) + return -ENOMEM; + + INIT_LIST_HEAD(&addr->entry); + addr->address = address; + addr->length = length; + + list_add_tail(&addr->entry, &slave->addresses); + return 0; +} + +/** + * fsl_dma_slave_free - free a struct fsl_dma_slave + * @slave: the struct fsl_dma_slave to free + * + * Free a struct fsl_dma_slave and all associated address/length pairs + */ +static inline void fsl_dma_slave_free(struct fsl_dma_slave *slave) +{ + struct fsl_dma_hw_addr *addr, *tmp; + + if (slave) { + list_for_each_entry_safe(addr, tmp, &slave->addresses, entry) { + list_del(&addr->entry); + kfree(addr); + } + + kfree(slave); + } +} + +/** + * fsl_dma_slave_alloc - allocate a struct fsl_dma_slave + * @gfp: the flags to pass to kmalloc when allocating this structure + * + * Allocate a struct fsl_dma_slave for use by the DMA_SLAVE API. Returns a new + * struct fsl_dma_slave on success, or NULL on failure. + */ +static inline struct fsl_dma_slave *fsl_dma_slave_alloc(gfp_t gfp) +{ + struct fsl_dma_slave *slave; + + slave = kzalloc(sizeof(*slave), gfp); + if (!slave) + return NULL; + + INIT_LIST_HEAD(&slave->addresses); + return slave; +} + +#endif /* __ARCH_POWERPC_ASM_FSLDMA_H__ */ diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 7a0cb6064f8..296f9e747fa 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -34,6 +34,7 @@ #include #include +#include #include "fsldma.h" static void dma_init(struct fsl_dma_chan *fsl_chan) @@ -551,6 +552,229 @@ fail: return NULL; } +/** + * fsl_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction + * @chan: DMA channel + * @sgl: scatterlist to transfer to/from + * @sg_len: number of entries in @scatterlist + * @direction: DMA direction + * @flags: DMAEngine flags + * + * Prepare a set of descriptors for a DMA_SLAVE transaction. Following the + * DMA_SLAVE API, this gets the device-specific information from the + * chan->private variable. + */ +static struct dma_async_tx_descriptor *fsl_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, + enum dma_data_direction direction, unsigned long flags) +{ + struct fsl_dma_chan *fsl_chan; + struct fsl_desc_sw *first = NULL, *prev = NULL, *new = NULL; + struct fsl_dma_slave *slave; + struct list_head *tx_list; + size_t copy; + + int i; + struct scatterlist *sg; + size_t sg_used; + size_t hw_used; + struct fsl_dma_hw_addr *hw; + dma_addr_t dma_dst, dma_src; + + if (!chan) + return NULL; + + if (!chan->private) + return NULL; + + fsl_chan = to_fsl_chan(chan); + slave = chan->private; + + if (list_empty(&slave->addresses)) + return NULL; + + hw = list_first_entry(&slave->addresses, struct fsl_dma_hw_addr, entry); + hw_used = 0; + + /* + * Build the hardware transaction to copy from the scatterlist to + * the hardware, or from the hardware to the scatterlist + * + * If you are copying from the hardware to the scatterlist and it + * takes two hardware entries to fill an entire page, then both + * hardware entries will be coalesced into the same page + * + * If you are copying from the scatterlist to the hardware and a + * single page can fill two hardware entries, then the data will + * be read out of the page into the first hardware entry, and so on + */ + for_each_sg(sgl, sg, sg_len, i) { + sg_used = 0; + + /* Loop until the entire scatterlist entry is used */ + while (sg_used < sg_dma_len(sg)) { + + /* + * If we've used up the current hardware address/length + * pair, we need to load a new one + * + * This is done in a while loop so that descriptors with + * length == 0 will be skipped + */ + while (hw_used >= hw->length) { + + /* + * If the current hardware entry is the last + * entry in the list, we're finished + */ + if (list_is_last(&hw->entry, &slave->addresses)) + goto finished; + + /* Get the next hardware address/length pair */ + hw = list_entry(hw->entry.next, + struct fsl_dma_hw_addr, entry); + hw_used = 0; + } + + /* Allocate the link descriptor from DMA pool */ + new = fsl_dma_alloc_descriptor(fsl_chan); + if (!new) { + dev_err(fsl_chan->dev, "No free memory for " + "link descriptor\n"); + goto fail; + } +#ifdef FSL_DMA_LD_DEBUG + dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new); +#endif + + /* + * Calculate the maximum number of bytes to transfer, + * making sure it is less than the DMA controller limit + */ + copy = min_t(size_t, sg_dma_len(sg) - sg_used, + hw->length - hw_used); + copy = min_t(size_t, copy, FSL_DMA_BCR_MAX_CNT); + + /* + * DMA_FROM_DEVICE + * from the hardware to the scatterlist + * + * DMA_TO_DEVICE + * from the scatterlist to the hardware + */ + if (direction == DMA_FROM_DEVICE) { + dma_src = hw->address + hw_used; + dma_dst = sg_dma_address(sg) + sg_used; + } else { + dma_src = sg_dma_address(sg) + sg_used; + dma_dst = hw->address + hw_used; + } + + /* Fill in the descriptor */ + set_desc_cnt(fsl_chan, &new->hw, copy); + set_desc_src(fsl_chan, &new->hw, dma_src); + set_desc_dest(fsl_chan, &new->hw, dma_dst); + + /* + * If this is not the first descriptor, chain the + * current descriptor after the previous descriptor + */ + if (!first) { + first = new; + } else { + set_desc_next(fsl_chan, &prev->hw, + new->async_tx.phys); + } + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + + prev = new; + sg_used += copy; + hw_used += copy; + + /* Insert the link descriptor into the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } + } + +finished: + + /* All of the hardware address/length pairs had length == 0 */ + if (!first || !new) + return NULL; + + new->async_tx.flags = flags; + new->async_tx.cookie = -EBUSY; + + /* Set End-of-link to the last link descriptor of new list */ + set_ld_eol(fsl_chan, new); + + /* Enable extra controller features */ + if (fsl_chan->set_src_loop_size) + fsl_chan->set_src_loop_size(fsl_chan, slave->src_loop_size); + + if (fsl_chan->set_dest_loop_size) + fsl_chan->set_dest_loop_size(fsl_chan, slave->dst_loop_size); + + if (fsl_chan->toggle_ext_start) + fsl_chan->toggle_ext_start(fsl_chan, slave->external_start); + + if (fsl_chan->toggle_ext_pause) + fsl_chan->toggle_ext_pause(fsl_chan, slave->external_pause); + + if (fsl_chan->set_request_count) + fsl_chan->set_request_count(fsl_chan, slave->request_count); + + return &first->async_tx; + +fail: + /* If first was not set, then we failed to allocate the very first + * descriptor, and we're done */ + if (!first) + return NULL; + + /* + * First is set, so all of the descriptors we allocated have been added + * to first->tx_list, INCLUDING "first" itself. Therefore we + * must traverse the list backwards freeing each descriptor in turn + * + * We're re-using variables for the loop, oh well + */ + tx_list = &first->tx_list; + list_for_each_entry_safe_reverse(new, prev, tx_list, node) { + list_del_init(&new->node); + dma_pool_free(fsl_chan->desc_pool, new, new->async_tx.phys); + } + + return NULL; +} + +static void fsl_dma_device_terminate_all(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan; + struct fsl_desc_sw *desc, *tmp; + unsigned long flags; + + if (!chan) + return; + + fsl_chan = to_fsl_chan(chan); + + /* Halt the DMA engine */ + dma_halt(fsl_chan); + + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + + /* Remove and free all of the descriptors in the LD queue */ + list_for_each_entry_safe(desc, tmp, &fsl_chan->ld_queue, node) { + list_del(&desc->node); + dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys); + } + + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); +} + /** * fsl_dma_update_completed_cookie - Update the completed cookie. * @fsl_chan : Freescale DMA channel @@ -977,12 +1201,15 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev, dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); + dma_cap_set(DMA_SLAVE, fdev->common.cap_mask); fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; fdev->common.device_prep_dma_interrupt = fsl_dma_prep_interrupt; fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; fdev->common.device_is_tx_complete = fsl_dma_is_complete; fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; + fdev->common.device_prep_slave_sg = fsl_dma_prep_slave_sg; + fdev->common.device_terminate_all = fsl_dma_device_terminate_all; fdev->common.dev = &dev->dev; fdev->irq = irq_of_parse_and_map(dev->node, 0); From 657a77fa7284d8ae28dfa48f1dc5d919bf5b2843 Mon Sep 17 00:00:00 2001 From: Atsushi Nemoto Date: Tue, 8 Sep 2009 17:53:05 -0700 Subject: [PATCH 79/91] dmaengine: Move all map_sg/unmap_sg for slave channel to its client Dan Williams wrote: ... DMA-slave clients request specific channels and know the hardware details at a low level, so it should not be too high an expectation to push dma mapping responsibility to the client. Also this patch includes DMA_COMPL_{SRC,DEST}_UNMAP_SINGLE support for dw_dmac driver. Acked-by: Maciej Sosnowski Acked-by: Nicolas Ferre Signed-off-by: Atsushi Nemoto Signed-off-by: Dan Williams --- drivers/dma/at_hdmac.c | 43 ++++++++++++++++++------------------ drivers/dma/dw_dmac.c | 31 ++++++++++++++++---------- drivers/mmc/host/atmel-mci.c | 9 +++++++- 3 files changed, 49 insertions(+), 34 deletions(-) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index da4e8b710a9..0aeb578a24e 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -253,25 +253,28 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) list_move(&desc->desc_node, &atchan->free_list); /* unmap dma addresses */ - if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) - dma_unmap_single(chan2parent(&atchan->chan_common), - desc->lli.daddr, - desc->len, DMA_FROM_DEVICE); - else - dma_unmap_page(chan2parent(&atchan->chan_common), - desc->lli.daddr, - desc->len, DMA_FROM_DEVICE); - } - if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) - dma_unmap_single(chan2parent(&atchan->chan_common), - desc->lli.saddr, - desc->len, DMA_TO_DEVICE); - else - dma_unmap_page(chan2parent(&atchan->chan_common), - desc->lli.saddr, - desc->len, DMA_TO_DEVICE); + if (!atchan->chan_common.private) { + struct device *parent = chan2parent(&atchan->chan_common); + if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) + dma_unmap_single(parent, + desc->lli.daddr, + desc->len, DMA_FROM_DEVICE); + else + dma_unmap_page(parent, + desc->lli.daddr, + desc->len, DMA_FROM_DEVICE); + } + if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) + dma_unmap_single(parent, + desc->lli.saddr, + desc->len, DMA_TO_DEVICE); + else + dma_unmap_page(parent, + desc->lli.saddr, + desc->len, DMA_TO_DEVICE); + } } /* @@ -647,8 +650,6 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, reg_width = atslave->reg_width; - sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction); - ctrla = ATC_DEFAULT_CTRLA | atslave->ctrla; ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN; diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 514ef7d71bc..8fb74828036 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -212,16 +212,25 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) list_splice_init(&desc->tx_list, &dwc->free_list); list_move(&desc->desc_node, &dwc->free_list); - /* - * We use dma_unmap_page() regardless of how the buffers were - * mapped before they were submitted... - */ - if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) - dma_unmap_page(chan2parent(&dwc->chan), desc->lli.dar, - desc->len, DMA_FROM_DEVICE); - if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) - dma_unmap_page(chan2parent(&dwc->chan), desc->lli.sar, - desc->len, DMA_TO_DEVICE); + if (!dwc->chan.private) { + struct device *parent = chan2parent(&dwc->chan); + if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) + dma_unmap_single(parent, desc->lli.dar, + desc->len, DMA_FROM_DEVICE); + else + dma_unmap_page(parent, desc->lli.dar, + desc->len, DMA_FROM_DEVICE); + } + if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) + dma_unmap_single(parent, desc->lli.sar, + desc->len, DMA_TO_DEVICE); + else + dma_unmap_page(parent, desc->lli.sar, + desc->len, DMA_TO_DEVICE); + } + } /* * The API requires that no submissions are done from a @@ -658,8 +667,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, reg_width = dws->reg_width; prev = first = NULL; - sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction); - switch (direction) { case DMA_TO_DEVICE: ctllo = (DWC_DEFAULT_CTLLO diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 7b603e4b41d..5e10d3663ab 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -576,6 +576,7 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) struct scatterlist *sg; unsigned int i; enum dma_data_direction direction; + unsigned int sglen; /* * We don't do DMA on "complex" transfers, i.e. with @@ -605,11 +606,14 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) else direction = DMA_TO_DEVICE; + sglen = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, direction); + if (sglen != data->sg_len) + goto unmap_exit; desc = chan->device->device_prep_slave_sg(chan, data->sg, data->sg_len, direction, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) - return -ENOMEM; + goto unmap_exit; host->dma.data_desc = desc; desc->callback = atmci_dma_complete; @@ -620,6 +624,9 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) chan->device->device_issue_pending(chan); return 0; +unmap_exit: + dma_unmap_sg(&host->pdev->dev, data->sg, sglen, direction); + return -ENOMEM; } #else /* CONFIG_MMC_ATMELMCI_DMA */ From d8902adcc1a9fd484c8cb5e575152e32192c1ff8 Mon Sep 17 00:00:00 2001 From: Nobuhiro Iwamatsu Date: Mon, 7 Sep 2009 03:26:23 +0000 Subject: [PATCH 80/91] dmaengine: sh: Add Support SuperH DMA Engine driver This supported all DMA channels, and it was tested in SH7722, SH7780, SH7785 and SH7763. This can not use with SH DMA API. Signed-off-by: Nobuhiro Iwamatsu Reviewed-by: Matt Fleming Acked-by: Maciej Sosnowski Acked-by: Paul Mundt Signed-off-by: Dan Williams --- arch/sh/drivers/dma/Kconfig | 12 +- arch/sh/drivers/dma/Makefile | 3 +- arch/sh/include/asm/dma-sh.h | 13 + drivers/dma/Kconfig | 8 + drivers/dma/Makefile | 1 + drivers/dma/shdma.c | 786 +++++++++++++++++++++++++++++++++++ drivers/dma/shdma.h | 64 +++ 7 files changed, 882 insertions(+), 5 deletions(-) create mode 100644 drivers/dma/shdma.c create mode 100644 drivers/dma/shdma.h diff --git a/arch/sh/drivers/dma/Kconfig b/arch/sh/drivers/dma/Kconfig index 63e9dd30b41..f935a7e5cbe 100644 --- a/arch/sh/drivers/dma/Kconfig +++ b/arch/sh/drivers/dma/Kconfig @@ -1,12 +1,9 @@ menu "DMA support" -config SH_DMA_API - bool config SH_DMA bool "SuperH on-chip DMA controller (DMAC) support" depends on CPU_SH3 || CPU_SH4 - select SH_DMA_API default n config SH_DMA_IRQ_MULTI @@ -19,6 +16,15 @@ config SH_DMA_IRQ_MULTI CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785 || \ CPU_SUBTYPE_SH7760 +config SH_DMA_API + depends on SH_DMA + bool "SuperH DMA API support" + default n + help + SH_DMA_API always enabled DMA API of used SuperH. + If you want to use DMA ENGINE, you must not enable this. + Please enable DMA_ENGINE and SH_DMAE. + config NR_ONCHIP_DMA_CHANNELS int depends on SH_DMA diff --git a/arch/sh/drivers/dma/Makefile b/arch/sh/drivers/dma/Makefile index c6068137b46..d88c9484762 100644 --- a/arch/sh/drivers/dma/Makefile +++ b/arch/sh/drivers/dma/Makefile @@ -2,8 +2,7 @@ # Makefile for the SuperH DMA specific kernel interface routines under Linux. # -obj-$(CONFIG_SH_DMA_API) += dma-api.o dma-sysfs.o -obj-$(CONFIG_SH_DMA) += dma-sh.o +obj-$(CONFIG_SH_DMA_API) += dma-sh.o dma-api.o dma-sysfs.o obj-$(CONFIG_PVR2_DMA) += dma-pvr2.o obj-$(CONFIG_G2_DMA) += dma-g2.o obj-$(CONFIG_SH_DMABRG) += dmabrg.o diff --git a/arch/sh/include/asm/dma-sh.h b/arch/sh/include/asm/dma-sh.h index 0c8f8e14622..89bdac558db 100644 --- a/arch/sh/include/asm/dma-sh.h +++ b/arch/sh/include/asm/dma-sh.h @@ -115,4 +115,17 @@ static u32 dma_base_addr[] __maybe_unused = { #define CHCR 0x0C #define DMAOR 0x40 +/* + * for dma engine + * + * SuperH DMA mode + */ +#define SHDMA_MIX_IRQ (1 << 1) +#define SHDMA_DMAOR1 (1 << 2) +#define SHDMA_DMAE1 (1 << 3) + +struct sh_dmae_pdata { + unsigned int mode; +}; + #endif /* __DMA_SH_H */ diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index fe1f3717b1f..3230a780c3d 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -101,6 +101,14 @@ config TXX9_DMAC Support the TXx9 SoC internal DMA controller. This can be integrated in chips such as the Toshiba TX4927/38/39. +config SH_DMAE + tristate "Renesas SuperH DMAC support" + depends on SUPERH && SH_DMA + depends on !SH_DMA_API + select DMA_ENGINE + help + Enable support for the Renesas SuperH DMA controllers. + config DMA_ENGINE bool diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 8f115e93b4a..eca71ba78ae 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_DW_DMAC) += dw_dmac.o obj-$(CONFIG_AT_HDMAC) += at_hdmac.o obj-$(CONFIG_MX3_IPU) += ipu/ obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o +obj-$(CONFIG_SH_DMAE) += shdma.o diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c new file mode 100644 index 00000000000..b3b065c4e5c --- /dev/null +++ b/drivers/dma/shdma.c @@ -0,0 +1,786 @@ +/* + * Renesas SuperH DMA Engine support + * + * base is drivers/dma/flsdma.c + * + * Copyright (C) 2009 Nobuhiro Iwamatsu + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * - DMA of SuperH does not have Hardware DMA chain mode. + * - MAX DMA size is 16MB. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "shdma.h" + +/* DMA descriptor control */ +#define DESC_LAST (-1) +#define DESC_COMP (1) +#define DESC_NCOMP (0) + +#define NR_DESCS_PER_CHANNEL 32 +/* + * Define the default configuration for dual address memory-memory transfer. + * The 0x400 value represents auto-request, external->external. + * + * And this driver set 4byte burst mode. + * If you want to change mode, you need to change RS_DEFAULT of value. + * (ex 1byte burst mode -> (RS_DUAL & ~TS_32) + */ +#define RS_DEFAULT (RS_DUAL) + +#define SH_DMAC_CHAN_BASE(id) (dma_base_addr[id]) +static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) +{ + ctrl_outl(data, (SH_DMAC_CHAN_BASE(sh_dc->id) + reg)); +} + +static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) +{ + return ctrl_inl((SH_DMAC_CHAN_BASE(sh_dc->id) + reg)); +} + +static void dmae_init(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = RS_DEFAULT; /* default is DUAL mode */ + sh_dmae_writel(sh_chan, chcr, CHCR); +} + +/* + * Reset DMA controller + * + * SH7780 has two DMAOR register + */ +static void sh_dmae_ctl_stop(int id) +{ + unsigned short dmaor = dmaor_read_reg(id); + + dmaor &= ~(DMAOR_NMIF | DMAOR_AE); + dmaor_write_reg(id, dmaor); +} + +static int sh_dmae_rst(int id) +{ + unsigned short dmaor; + + sh_dmae_ctl_stop(id); + dmaor = (dmaor_read_reg(id)|DMAOR_INIT); + + dmaor_write_reg(id, dmaor); + if ((dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF))) { + pr_warning(KERN_ERR "dma-sh: Can't initialize DMAOR.\n"); + return -EINVAL; + } + return 0; +} + +static int dmae_is_idle(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = sh_dmae_readl(sh_chan, CHCR); + if (chcr & CHCR_DE) { + if (!(chcr & CHCR_TE)) + return -EBUSY; /* working */ + } + return 0; /* waiting */ +} + +static inline unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = sh_dmae_readl(sh_chan, CHCR); + return ts_shift[(chcr & CHCR_TS_MASK) >> CHCR_TS_SHIFT]; +} + +static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs hw) +{ + sh_dmae_writel(sh_chan, hw.sar, SAR); + sh_dmae_writel(sh_chan, hw.dar, DAR); + sh_dmae_writel(sh_chan, + (hw.tcr >> calc_xmit_shift(sh_chan)), TCR); +} + +static void dmae_start(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = sh_dmae_readl(sh_chan, CHCR); + + chcr |= (CHCR_DE|CHCR_IE); + sh_dmae_writel(sh_chan, chcr, CHCR); +} + +static void dmae_halt(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = sh_dmae_readl(sh_chan, CHCR); + + chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE); + sh_dmae_writel(sh_chan, chcr, CHCR); +} + +static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) +{ + int ret = dmae_is_idle(sh_chan); + /* When DMA was working, can not set data to CHCR */ + if (ret) + return ret; + + sh_dmae_writel(sh_chan, val, CHCR); + return 0; +} + +#define DMARS1_ADDR 0x04 +#define DMARS2_ADDR 0x08 +#define DMARS_SHIFT 8 +#define DMARS_CHAN_MSK 0x01 +static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) +{ + u32 addr; + int shift = 0; + int ret = dmae_is_idle(sh_chan); + if (ret) + return ret; + + if (sh_chan->id & DMARS_CHAN_MSK) + shift = DMARS_SHIFT; + + switch (sh_chan->id) { + /* DMARS0 */ + case 0: + case 1: + addr = SH_DMARS_BASE; + break; + /* DMARS1 */ + case 2: + case 3: + addr = (SH_DMARS_BASE + DMARS1_ADDR); + break; + /* DMARS2 */ + case 4: + case 5: + addr = (SH_DMARS_BASE + DMARS2_ADDR); + break; + default: + return -EINVAL; + } + + ctrl_outw((val << shift) | + (ctrl_inw(addr) & (shift ? 0xFF00 : 0x00FF)), + addr); + + return 0; +} + +static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct sh_desc *desc = tx_to_sh_desc(tx); + struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan); + dma_cookie_t cookie; + + spin_lock_bh(&sh_chan->desc_lock); + + cookie = sh_chan->common.cookie; + cookie++; + if (cookie < 0) + cookie = 1; + + /* If desc only in the case of 1 */ + if (desc->async_tx.cookie != -EBUSY) + desc->async_tx.cookie = cookie; + sh_chan->common.cookie = desc->async_tx.cookie; + + list_splice_init(&desc->tx_list, sh_chan->ld_queue.prev); + + spin_unlock_bh(&sh_chan->desc_lock); + + return cookie; +} + +static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan) +{ + struct sh_desc *desc, *_desc, *ret = NULL; + + spin_lock_bh(&sh_chan->desc_lock); + list_for_each_entry_safe(desc, _desc, &sh_chan->ld_free, node) { + if (async_tx_test_ack(&desc->async_tx)) { + list_del(&desc->node); + ret = desc; + break; + } + } + spin_unlock_bh(&sh_chan->desc_lock); + + return ret; +} + +static void sh_dmae_put_desc(struct sh_dmae_chan *sh_chan, struct sh_desc *desc) +{ + if (desc) { + spin_lock_bh(&sh_chan->desc_lock); + + list_splice_init(&desc->tx_list, &sh_chan->ld_free); + list_add(&desc->node, &sh_chan->ld_free); + + spin_unlock_bh(&sh_chan->desc_lock); + } +} + +static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) +{ + struct sh_dmae_chan *sh_chan = to_sh_chan(chan); + struct sh_desc *desc; + + spin_lock_bh(&sh_chan->desc_lock); + while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) { + spin_unlock_bh(&sh_chan->desc_lock); + desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL); + if (!desc) { + spin_lock_bh(&sh_chan->desc_lock); + break; + } + dma_async_tx_descriptor_init(&desc->async_tx, + &sh_chan->common); + desc->async_tx.tx_submit = sh_dmae_tx_submit; + desc->async_tx.flags = DMA_CTRL_ACK; + INIT_LIST_HEAD(&desc->tx_list); + sh_dmae_put_desc(sh_chan, desc); + + spin_lock_bh(&sh_chan->desc_lock); + sh_chan->descs_allocated++; + } + spin_unlock_bh(&sh_chan->desc_lock); + + return sh_chan->descs_allocated; +} + +/* + * sh_dma_free_chan_resources - Free all resources of the channel. + */ +static void sh_dmae_free_chan_resources(struct dma_chan *chan) +{ + struct sh_dmae_chan *sh_chan = to_sh_chan(chan); + struct sh_desc *desc, *_desc; + LIST_HEAD(list); + + BUG_ON(!list_empty(&sh_chan->ld_queue)); + spin_lock_bh(&sh_chan->desc_lock); + + list_splice_init(&sh_chan->ld_free, &list); + sh_chan->descs_allocated = 0; + + spin_unlock_bh(&sh_chan->desc_lock); + + list_for_each_entry_safe(desc, _desc, &list, node) + kfree(desc); +} + +static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct sh_dmae_chan *sh_chan; + struct sh_desc *first = NULL, *prev = NULL, *new; + size_t copy_size; + + if (!chan) + return NULL; + + if (!len) + return NULL; + + sh_chan = to_sh_chan(chan); + + do { + /* Allocate the link descriptor from DMA pool */ + new = sh_dmae_get_desc(sh_chan); + if (!new) { + dev_err(sh_chan->dev, + "No free memory for link descriptor\n"); + goto err_get_desc; + } + + copy_size = min(len, (size_t)SH_DMA_TCR_MAX); + + new->hw.sar = dma_src; + new->hw.dar = dma_dest; + new->hw.tcr = copy_size; + if (!first) + first = new; + + new->mark = DESC_NCOMP; + async_tx_ack(&new->async_tx); + + prev = new; + len -= copy_size; + dma_src += copy_size; + dma_dest += copy_size; + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + new->async_tx.flags = flags; /* client is in control of this ack */ + new->async_tx.cookie = -EBUSY; /* Last desc */ + + return &first->async_tx; + +err_get_desc: + sh_dmae_put_desc(sh_chan, first); + return NULL; + +} + +/* + * sh_chan_ld_cleanup - Clean up link descriptors + * + * This function clean up the ld_queue of DMA channel. + */ +static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan) +{ + struct sh_desc *desc, *_desc; + + spin_lock_bh(&sh_chan->desc_lock); + list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) { + dma_async_tx_callback callback; + void *callback_param; + + /* non send data */ + if (desc->mark == DESC_NCOMP) + break; + + /* send data sesc */ + callback = desc->async_tx.callback; + callback_param = desc->async_tx.callback_param; + + /* Remove from ld_queue list */ + list_splice_init(&desc->tx_list, &sh_chan->ld_free); + + dev_dbg(sh_chan->dev, "link descriptor %p will be recycle.\n", + desc); + + list_move(&desc->node, &sh_chan->ld_free); + /* Run the link descriptor callback function */ + if (callback) { + spin_unlock_bh(&sh_chan->desc_lock); + dev_dbg(sh_chan->dev, "link descriptor %p callback\n", + desc); + callback(callback_param); + spin_lock_bh(&sh_chan->desc_lock); + } + } + spin_unlock_bh(&sh_chan->desc_lock); +} + +static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) +{ + struct list_head *ld_node; + struct sh_dmae_regs hw; + + /* DMA work check */ + if (dmae_is_idle(sh_chan)) + return; + + /* Find the first un-transfer desciptor */ + for (ld_node = sh_chan->ld_queue.next; + (ld_node != &sh_chan->ld_queue) + && (to_sh_desc(ld_node)->mark == DESC_COMP); + ld_node = ld_node->next) + cpu_relax(); + + if (ld_node != &sh_chan->ld_queue) { + /* Get the ld start address from ld_queue */ + hw = to_sh_desc(ld_node)->hw; + dmae_set_reg(sh_chan, hw); + dmae_start(sh_chan); + } +} + +static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan) +{ + struct sh_dmae_chan *sh_chan = to_sh_chan(chan); + sh_chan_xfer_ld_queue(sh_chan); +} + +static enum dma_status sh_dmae_is_complete(struct dma_chan *chan, + dma_cookie_t cookie, + dma_cookie_t *done, + dma_cookie_t *used) +{ + struct sh_dmae_chan *sh_chan = to_sh_chan(chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + + sh_dmae_chan_ld_cleanup(sh_chan); + + last_used = chan->cookie; + last_complete = sh_chan->completed_cookie; + if (last_complete == -EBUSY) + last_complete = last_used; + + if (done) + *done = last_complete; + + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +static irqreturn_t sh_dmae_interrupt(int irq, void *data) +{ + irqreturn_t ret = IRQ_NONE; + struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; + u32 chcr = sh_dmae_readl(sh_chan, CHCR); + + if (chcr & CHCR_TE) { + /* DMA stop */ + dmae_halt(sh_chan); + + ret = IRQ_HANDLED; + tasklet_schedule(&sh_chan->tasklet); + } + + return ret; +} + +#if defined(CONFIG_CPU_SH4) +static irqreturn_t sh_dmae_err(int irq, void *data) +{ + int err = 0; + struct sh_dmae_device *shdev = (struct sh_dmae_device *)data; + + /* IRQ Multi */ + if (shdev->pdata.mode & SHDMA_MIX_IRQ) { + int cnt = 0; + switch (irq) { +#if defined(DMTE6_IRQ) && defined(DMAE1_IRQ) + case DMTE6_IRQ: + cnt++; +#endif + case DMTE0_IRQ: + if (dmaor_read_reg(cnt) & (DMAOR_NMIF | DMAOR_AE)) { + disable_irq(irq); + return IRQ_HANDLED; + } + default: + return IRQ_NONE; + } + } else { + /* reset dma controller */ + err = sh_dmae_rst(0); + if (err) + return err; + if (shdev->pdata.mode & SHDMA_DMAOR1) { + err = sh_dmae_rst(1); + if (err) + return err; + } + disable_irq(irq); + return IRQ_HANDLED; + } +} +#endif + +static void dmae_do_tasklet(unsigned long data) +{ + struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; + struct sh_desc *desc, *_desc, *cur_desc = NULL; + u32 sar_buf = sh_dmae_readl(sh_chan, SAR); + list_for_each_entry_safe(desc, _desc, + &sh_chan->ld_queue, node) { + if ((desc->hw.sar + desc->hw.tcr) == sar_buf) { + cur_desc = desc; + break; + } + } + + if (cur_desc) { + switch (cur_desc->async_tx.cookie) { + case 0: /* other desc data */ + break; + case -EBUSY: /* last desc */ + sh_chan->completed_cookie = + cur_desc->async_tx.cookie; + break; + default: /* first desc ( 0 < )*/ + sh_chan->completed_cookie = + cur_desc->async_tx.cookie - 1; + break; + } + cur_desc->mark = DESC_COMP; + } + /* Next desc */ + sh_chan_xfer_ld_queue(sh_chan); + sh_dmae_chan_ld_cleanup(sh_chan); +} + +static unsigned int get_dmae_irq(unsigned int id) +{ + unsigned int irq = 0; + if (id < ARRAY_SIZE(dmte_irq_map)) + irq = dmte_irq_map[id]; + return irq; +} + +static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id) +{ + int err; + unsigned int irq = get_dmae_irq(id); + unsigned long irqflags = IRQF_DISABLED; + struct sh_dmae_chan *new_sh_chan; + + /* alloc channel */ + new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); + if (!new_sh_chan) { + dev_err(shdev->common.dev, "No free memory for allocating " + "dma channels!\n"); + return -ENOMEM; + } + + new_sh_chan->dev = shdev->common.dev; + new_sh_chan->id = id; + + /* Init DMA tasklet */ + tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet, + (unsigned long)new_sh_chan); + + /* Init the channel */ + dmae_init(new_sh_chan); + + spin_lock_init(&new_sh_chan->desc_lock); + + /* Init descripter manage list */ + INIT_LIST_HEAD(&new_sh_chan->ld_queue); + INIT_LIST_HEAD(&new_sh_chan->ld_free); + + /* copy struct dma_device */ + new_sh_chan->common.device = &shdev->common; + + /* Add the channel to DMA device channel list */ + list_add_tail(&new_sh_chan->common.device_node, + &shdev->common.channels); + shdev->common.chancnt++; + + if (shdev->pdata.mode & SHDMA_MIX_IRQ) { + irqflags = IRQF_SHARED; +#if defined(DMTE6_IRQ) + if (irq >= DMTE6_IRQ) + irq = DMTE6_IRQ; + else +#endif + irq = DMTE0_IRQ; + } + + snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), + "sh-dmae%d", new_sh_chan->id); + + /* set up channel irq */ + err = request_irq(irq, &sh_dmae_interrupt, + irqflags, new_sh_chan->dev_id, new_sh_chan); + if (err) { + dev_err(shdev->common.dev, "DMA channel %d request_irq error " + "with return %d\n", id, err); + goto err_no_irq; + } + + /* CHCR register control function */ + new_sh_chan->set_chcr = dmae_set_chcr; + /* DMARS register control function */ + new_sh_chan->set_dmars = dmae_set_dmars; + + shdev->chan[id] = new_sh_chan; + return 0; + +err_no_irq: + /* remove from dmaengine device node */ + list_del(&new_sh_chan->common.device_node); + kfree(new_sh_chan); + return err; +} + +static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) +{ + int i; + + for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) { + if (shdev->chan[i]) { + struct sh_dmae_chan *shchan = shdev->chan[i]; + if (!(shdev->pdata.mode & SHDMA_MIX_IRQ)) + free_irq(dmte_irq_map[i], shchan); + + list_del(&shchan->common.device_node); + kfree(shchan); + shdev->chan[i] = NULL; + } + } + shdev->common.chancnt = 0; +} + +static int __init sh_dmae_probe(struct platform_device *pdev) +{ + int err = 0, cnt, ecnt; + unsigned long irqflags = IRQF_DISABLED; +#if defined(CONFIG_CPU_SH4) + int eirq[] = { DMAE0_IRQ, +#if defined(DMAE1_IRQ) + DMAE1_IRQ +#endif + }; +#endif + struct sh_dmae_device *shdev; + + shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL); + if (!shdev) { + dev_err(&pdev->dev, "No enough memory\n"); + err = -ENOMEM; + goto shdev_err; + } + + /* get platform data */ + if (!pdev->dev.platform_data) + goto shdev_err; + + /* platform data */ + memcpy(&shdev->pdata, pdev->dev.platform_data, + sizeof(struct sh_dmae_pdata)); + + /* reset dma controller */ + err = sh_dmae_rst(0); + if (err) + goto rst_err; + + /* SH7780/85/23 has DMAOR1 */ + if (shdev->pdata.mode & SHDMA_DMAOR1) { + err = sh_dmae_rst(1); + if (err) + goto rst_err; + } + + INIT_LIST_HEAD(&shdev->common.channels); + + dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask); + shdev->common.device_alloc_chan_resources + = sh_dmae_alloc_chan_resources; + shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources; + shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy; + shdev->common.device_is_tx_complete = sh_dmae_is_complete; + shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending; + shdev->common.dev = &pdev->dev; + +#if defined(CONFIG_CPU_SH4) + /* Non Mix IRQ mode SH7722/SH7730 etc... */ + if (shdev->pdata.mode & SHDMA_MIX_IRQ) { + irqflags = IRQF_SHARED; + eirq[0] = DMTE0_IRQ; +#if defined(DMTE6_IRQ) && defined(DMAE1_IRQ) + eirq[1] = DMTE6_IRQ; +#endif + } + + for (ecnt = 0 ; ecnt < ARRAY_SIZE(eirq); ecnt++) { + err = request_irq(eirq[ecnt], sh_dmae_err, + irqflags, "DMAC Address Error", shdev); + if (err) { + dev_err(&pdev->dev, "DMA device request_irq" + "error (irq %d) with return %d\n", + eirq[ecnt], err); + goto eirq_err; + } + } +#endif /* CONFIG_CPU_SH4 */ + + /* Create DMA Channel */ + for (cnt = 0 ; cnt < MAX_DMA_CHANNELS ; cnt++) { + err = sh_dmae_chan_probe(shdev, cnt); + if (err) + goto chan_probe_err; + } + + platform_set_drvdata(pdev, shdev); + dma_async_device_register(&shdev->common); + + return err; + +chan_probe_err: + sh_dmae_chan_remove(shdev); + +eirq_err: + for (ecnt-- ; ecnt >= 0; ecnt--) + free_irq(eirq[ecnt], shdev); + +rst_err: + kfree(shdev); + +shdev_err: + return err; +} + +static int __exit sh_dmae_remove(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + + dma_async_device_unregister(&shdev->common); + + if (shdev->pdata.mode & SHDMA_MIX_IRQ) { + free_irq(DMTE0_IRQ, shdev); +#if defined(DMTE6_IRQ) + free_irq(DMTE6_IRQ, shdev); +#endif + } + + /* channel data remove */ + sh_dmae_chan_remove(shdev); + + if (!(shdev->pdata.mode & SHDMA_MIX_IRQ)) { + free_irq(DMAE0_IRQ, shdev); +#if defined(DMAE1_IRQ) + free_irq(DMAE1_IRQ, shdev); +#endif + } + kfree(shdev); + + return 0; +} + +static void sh_dmae_shutdown(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + sh_dmae_ctl_stop(0); + if (shdev->pdata.mode & SHDMA_DMAOR1) + sh_dmae_ctl_stop(1); +} + +static struct platform_driver sh_dmae_driver = { + .remove = __exit_p(sh_dmae_remove), + .shutdown = sh_dmae_shutdown, + .driver = { + .name = "sh-dma-engine", + }, +}; + +static int __init sh_dmae_init(void) +{ + return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); +} +module_init(sh_dmae_init); + +static void __exit sh_dmae_exit(void) +{ + platform_driver_unregister(&sh_dmae_driver); +} +module_exit(sh_dmae_exit); + +MODULE_AUTHOR("Nobuhiro Iwamatsu "); +MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h new file mode 100644 index 00000000000..2b4bc15a2c0 --- /dev/null +++ b/drivers/dma/shdma.h @@ -0,0 +1,64 @@ +/* + * Renesas SuperH DMA Engine support + * + * Copyright (C) 2009 Nobuhiro Iwamatsu + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ +#ifndef __DMA_SHDMA_H +#define __DMA_SHDMA_H + +#include +#include +#include + +#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */ + +struct sh_dmae_regs { + u32 sar; /* SAR / source address */ + u32 dar; /* DAR / destination address */ + u32 tcr; /* TCR / transfer count */ +}; + +struct sh_desc { + struct list_head tx_list; + struct sh_dmae_regs hw; + struct list_head node; + struct dma_async_tx_descriptor async_tx; + int mark; +}; + +struct sh_dmae_chan { + dma_cookie_t completed_cookie; /* The maximum cookie completed */ + spinlock_t desc_lock; /* Descriptor operation lock */ + struct list_head ld_queue; /* Link descriptors queue */ + struct list_head ld_free; /* Link descriptors free */ + struct dma_chan common; /* DMA common channel */ + struct device *dev; /* Channel device */ + struct tasklet_struct tasklet; /* Tasklet */ + int descs_allocated; /* desc count */ + int id; /* Raw id of this channel */ + char dev_id[16]; /* unique name per DMAC of channel */ + + /* Set chcr */ + int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs); + /* Set DMA resource */ + int (*set_dmars)(struct sh_dmae_chan *sh_chan, u16 res); +}; + +struct sh_dmae_device { + struct dma_device common; + struct sh_dmae_chan *chan[MAX_DMA_CHANNELS]; + struct sh_dmae_pdata pdata; +}; + +#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common) +#define to_sh_desc(lh) container_of(lh, struct sh_desc, node) +#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx) + +#endif /* __DMA_SHDMA_H */ From 9a8de639f35ca3951b910d5e3a2f92f4cf3afc8f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 15:06:10 -0700 Subject: [PATCH 81/91] async_tx: remove HIGHMEM64G restriction This restriction prevented ASYNC_TX_DMA from being enabled on platform configurations where DMA address conversion could not be performed in place on the stack. Since commit 04ce9ab3 ("async_xor: permit callers to pass in a 'dma/page scribble' region") the async_tx api now either uses a caller provided 'scribble' buffer, or performs the conversion in place when sizeof(dma_addr_t) <= sizeof(struct page *). Signed-off-by: Dan Williams --- drivers/dma/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 3230a780c3d..5903a88351b 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -128,7 +128,7 @@ config NET_DMA config ASYNC_TX_DMA bool "Async_tx: Offload support for the async_tx api" - depends on DMA_ENGINE && !HIGHMEM64G + depends on DMA_ENGINE help This allows the async_tx api to take advantage of offload engines for memcpy, memset, xor, and raid6 p+q operations. If your platform has From 1a5aeeecd550ee4344cfba1791f1134739b16dc6 Mon Sep 17 00:00:00 2001 From: Maciej Sosnowski Date: Thu, 10 Sep 2009 15:05:58 +0200 Subject: [PATCH 82/91] dca: registering requesters in multiple dca domains This patch enables DCA support on multiple-IOH/multiple-IIO architectures. It modifies dca module by replacing single dca_providers list with dca_domains list, each domain containing separate list of providers. This approach lets dca driver manage multiple domains, i.e. sets of providers and requesters mapped back to the same PCI root complex device. The driver takes care to register each requester to a provider from the same domain. Signed-off-by: Dan Williams Signed-off-by: Maciej Sosnowski --- drivers/dca/dca-core.c | 120 ++++++++++++++++++++++++++++++++++++----- drivers/dma/ioat/pci.c | 2 +- include/linux/dca.h | 11 +++- 3 files changed, 119 insertions(+), 14 deletions(-) diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c index 25b743abfb5..7e318de0904 100644 --- a/drivers/dca/dca-core.c +++ b/drivers/dca/dca-core.c @@ -28,7 +28,7 @@ #include #include -#define DCA_VERSION "1.8" +#define DCA_VERSION "1.12.1" MODULE_VERSION(DCA_VERSION); MODULE_LICENSE("GPL"); @@ -36,20 +36,92 @@ MODULE_AUTHOR("Intel Corporation"); static DEFINE_SPINLOCK(dca_lock); -static LIST_HEAD(dca_providers); +static LIST_HEAD(dca_domains); + +static struct pci_bus *dca_pci_rc_from_dev(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_bus *bus = pdev->bus; + + while (bus->parent) + bus = bus->parent; + + return bus; +} + +static struct dca_domain *dca_allocate_domain(struct pci_bus *rc) +{ + struct dca_domain *domain; + + domain = kzalloc(sizeof(*domain), GFP_NOWAIT); + if (!domain) + return NULL; + + INIT_LIST_HEAD(&domain->dca_providers); + domain->pci_rc = rc; + + return domain; +} + +static void dca_free_domain(struct dca_domain *domain) +{ + list_del(&domain->node); + kfree(domain); +} + +static struct dca_domain *dca_find_domain(struct pci_bus *rc) +{ + struct dca_domain *domain; + + list_for_each_entry(domain, &dca_domains, node) + if (domain->pci_rc == rc) + return domain; + + return NULL; +} + +static struct dca_domain *dca_get_domain(struct device *dev) +{ + struct pci_bus *rc; + struct dca_domain *domain; + + rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(rc); + + if (!domain) { + domain = dca_allocate_domain(rc); + if (domain) + list_add(&domain->node, &dca_domains); + } + + return domain; +} static struct dca_provider *dca_find_provider_by_dev(struct device *dev) { - struct dca_provider *dca, *ret = NULL; + struct dca_provider *dca; + struct pci_bus *rc; + struct dca_domain *domain; - list_for_each_entry(dca, &dca_providers, node) { - if ((!dev) || (dca->ops->dev_managed(dca, dev))) { - ret = dca; - break; - } + if (dev) { + rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(rc); + if (!domain) + return NULL; + } else { + if (!list_empty(&dca_domains)) + domain = list_first_entry(&dca_domains, + struct dca_domain, + node); + else + return NULL; } - return ret; + list_for_each_entry(dca, &domain->dca_providers, node) + if ((!dev) || (dca->ops->dev_managed(dca, dev))) + return dca; + + return NULL; } /** @@ -61,6 +133,8 @@ int dca_add_requester(struct device *dev) struct dca_provider *dca; int err, slot = -ENODEV; unsigned long flags; + struct pci_bus *pci_rc; + struct dca_domain *domain; if (!dev) return -EFAULT; @@ -74,7 +148,14 @@ int dca_add_requester(struct device *dev) return -EEXIST; } - list_for_each_entry(dca, &dca_providers, node) { + pci_rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(pci_rc); + if (!domain) { + spin_unlock_irqrestore(&dca_lock, flags); + return -ENODEV; + } + + list_for_each_entry(dca, &domain->dca_providers, node) { slot = dca->ops->add_requester(dca, dev); if (slot >= 0) break; @@ -222,13 +303,19 @@ int register_dca_provider(struct dca_provider *dca, struct device *dev) { int err; unsigned long flags; + struct dca_domain *domain; err = dca_sysfs_add_provider(dca, dev); if (err) return err; spin_lock_irqsave(&dca_lock, flags); - list_add(&dca->node, &dca_providers); + domain = dca_get_domain(dev); + if (!domain) { + spin_unlock_irqrestore(&dca_lock, flags); + return -ENODEV; + } + list_add(&dca->node, &domain->dca_providers); spin_unlock_irqrestore(&dca_lock, flags); blocking_notifier_call_chain(&dca_provider_chain, @@ -241,15 +328,24 @@ EXPORT_SYMBOL_GPL(register_dca_provider); * unregister_dca_provider - remove a dca provider * @dca - struct created by alloc_dca_provider() */ -void unregister_dca_provider(struct dca_provider *dca) +void unregister_dca_provider(struct dca_provider *dca, struct device *dev) { unsigned long flags; + struct pci_bus *pci_rc; + struct dca_domain *domain; blocking_notifier_call_chain(&dca_provider_chain, DCA_PROVIDER_REMOVE, NULL); spin_lock_irqsave(&dca_lock, flags); + list_del(&dca->node); + + pci_rc = dca_pci_rc_from_dev(dev); + domain = dca_find_domain(pci_rc); + if (list_empty(&domain->dca_providers)) + dca_free_domain(domain); + spin_unlock_irqrestore(&dca_lock, flags); dca_sysfs_remove_provider(dca); diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c index c788fa26647..d545fae30f3 100644 --- a/drivers/dma/ioat/pci.c +++ b/drivers/dma/ioat/pci.c @@ -175,7 +175,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev) dev_err(&pdev->dev, "Removing dma and dca services\n"); if (device->dca) { - unregister_dca_provider(device->dca); + unregister_dca_provider(device->dca, &pdev->dev); free_dca_provider(device->dca); device->dca = NULL; } diff --git a/include/linux/dca.h b/include/linux/dca.h index 9c20c7e87d0..d27a7a05718 100644 --- a/include/linux/dca.h +++ b/include/linux/dca.h @@ -20,6 +20,9 @@ */ #ifndef DCA_H #define DCA_H + +#include + /* DCA Provider API */ /* DCA Notifier Interface */ @@ -36,6 +39,12 @@ struct dca_provider { int id; }; +struct dca_domain { + struct list_head node; + struct list_head dca_providers; + struct pci_bus *pci_rc; +}; + struct dca_ops { int (*add_requester) (struct dca_provider *, struct device *); int (*remove_requester) (struct dca_provider *, struct device *); @@ -47,7 +56,7 @@ struct dca_ops { struct dca_provider *alloc_dca_provider(struct dca_ops *ops, int priv_size); void free_dca_provider(struct dca_provider *dca); int register_dca_provider(struct dca_provider *dca, struct device *dev); -void unregister_dca_provider(struct dca_provider *dca); +void unregister_dca_provider(struct dca_provider *dca, struct device *dev); static inline void *dca_priv(struct dca_provider *dca) { From 3208ca52f3bfa36914c44db207d0a34071f9897f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 10 Sep 2009 11:27:36 -0700 Subject: [PATCH 83/91] ioat: driver version 4.0 A new ring implementation and the addition of raid functionality constitutes a bump in the driver major version number. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h index 6a675a2a2d1..c14fdfeb7f3 100644 --- a/drivers/dma/ioat/dma.h +++ b/drivers/dma/ioat/dma.h @@ -30,7 +30,7 @@ #include #include -#define IOAT_DMA_VERSION "3.64" +#define IOAT_DMA_VERSION "4.00" #define IOAT_LOW_COMPLETION_MASK 0xffffffc0 #define IOAT_DMA_DCA_ANY_CPU ~0 From 084dac53adcfb910792a66bc0bae720cdde971de Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sun, 13 Sep 2009 09:07:37 -0700 Subject: [PATCH 84/91] dca: module load should not be an error message The message (if it must exist) should not be an error message. IMHO such messages are useless. Signed-off-by: Stephen Hemminger Signed-off-by: Dan Williams --- drivers/dca/dca-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c index 7e318de0904..52e6bb70a49 100644 --- a/drivers/dca/dca-core.c +++ b/drivers/dca/dca-core.c @@ -372,7 +372,7 @@ EXPORT_SYMBOL_GPL(dca_unregister_notify); static int __init dca_init(void) { - printk(KERN_ERR "dca service started, version %s\n", DCA_VERSION); + pr_info("dca service started, version %s\n", DCA_VERSION); return dca_sysfs_init(); } From 2d6e4ecc87d20299bcb249dd62efbd73496744c3 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 16 Sep 2009 12:11:54 -0700 Subject: [PATCH 85/91] md/raid6: eliminate BUG_ON with side effect As pointed out by Neil it should be possible to build a driver with all BUG_ON statements deleted. It's bad form to have a BUG_ON with a side effect. Signed-off-by: Dan Williams --- drivers/md/raid5.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9b00a229015..0a5f03d93ae 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3214,8 +3214,10 @@ static bool handle_stripe6(struct stripe_head *sh) /* now count some things */ if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; - if (test_bit(R5_Wantcompute, &dev->flags)) - BUG_ON(++s.compute > 2); + if (test_bit(R5_Wantcompute, &dev->flags)) { + s.compute++; + BUG_ON(s.compute > 2); + } if (test_bit(R5_Wantfill, &dev->flags)) { s.to_fill++; From 6c910a78e495b4c1778a8b136b37fe3c05712730 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 16 Sep 2009 12:24:54 -0700 Subject: [PATCH 86/91] md/raid6: cleanup ops_run_compute6_2 Neil says: "It is correct as it stands, but the fact that every branch in the 'if' part ends with a 'return' isn't immediately obvious, so it is clearer if we are explicit about the if / then / else structure." Signed-off-by: Dan Williams --- drivers/md/raid5.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0a5f03d93ae..1898eda6072 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -810,7 +810,7 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); - /* we need to open-code set_syndrome_sources to handle to the + /* we need to open-code set_syndrome_sources to handle the * slot number conversion for 'faila' and 'failb' */ for (i = 0; i < disks ; i++) @@ -879,18 +879,21 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) return async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); } - } - - init_async_submit(&submit, ASYNC_TX_FENCE, NULL, ops_complete_compute, - sh, to_addr_conv(sh, percpu)); - if (failb == syndrome_disks) { - /* We're missing D+P. */ - return async_raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, - faila, blocks, &submit); } else { - /* We're missing D+D. */ - return async_raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, - faila, failb, blocks, &submit); + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + if (failb == syndrome_disks) { + /* We're missing D+P. */ + return async_raid6_datap_recov(syndrome_disks+2, + STRIPE_SIZE, faila, + blocks, &submit); + } else { + /* We're missing D+D. */ + return async_raid6_2data_recov(syndrome_disks+2, + STRIPE_SIZE, faila, failb, + blocks, &submit); + } } } From 376ec37667b510453f5a62fcd95d762786e6a0a9 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 16 Sep 2009 15:16:50 -0700 Subject: [PATCH 87/91] ioat2: clarify ring size limits With the addition of ioat_max_alloc_order it is not clear what the maximum allocation order is, so document that in the modinfo. Also take an opportunity to kill a stray semicolon. Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 5d6ac49e0d3..8fd0b59f190 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -42,18 +42,19 @@ int ioat_ring_alloc_order = 8; module_param(ioat_ring_alloc_order, int, 0644); MODULE_PARM_DESC(ioat_ring_alloc_order, - "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); + "ioat2+: allocate 2^n descriptors per channel" + " (default: 8 max: 16)"); static int ioat_ring_max_alloc_order = IOAT_MAX_ORDER; module_param(ioat_ring_max_alloc_order, int, 0644); MODULE_PARM_DESC(ioat_ring_max_alloc_order, - "ioat2+: upper limit for dynamic ring resizing (default: n=16)"); + "ioat2+: upper limit for ring size (default: 16)"); void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) { void * __iomem reg_base = ioat->base.reg_base; ioat->pending = 0; - ioat->dmacount += ioat2_ring_pending(ioat);; + ioat->dmacount += ioat2_ring_pending(ioat); ioat->issued = ioat->head; /* make descriptor updates globally visible before notifying channel */ wmb(); From 1b6df6930994d5d027375b07ac9da63644eb5758 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 16 Sep 2009 21:03:29 -0700 Subject: [PATCH 88/91] raid6test: fix stack overflow Testing on x86_64 with NDISKS=255 yields: do_IRQ: modprobe near stack overflow (cur:ffff88007d19c000,sp:ffff88007d19c128) ...and eventually general protection fault: 0000 [#1] Moving the scribble buffers off the stack allows the test to complete successfully. Signed-off-by: Dan Williams --- crypto/async_tx/raid6test.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c index 98c83ca96c8..3ec27c7e62e 100644 --- a/crypto/async_tx/raid6test.c +++ b/crypto/async_tx/raid6test.c @@ -28,6 +28,7 @@ #define NDISKS 16 /* Including P and Q */ static struct page *dataptrs[NDISKS]; +static addr_conv_t addr_conv[NDISKS]; static struct page *data[NDISKS+3]; static struct page *spare; static struct page *recovi; @@ -69,7 +70,6 @@ static char disk_type(int d, int disks) static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs) { struct async_submit_ctl submit; - addr_conv_t addr_conv[disks]; struct completion cmp; struct dma_async_tx_descriptor *tx = NULL; enum sum_check_flags result = ~0; @@ -156,7 +156,6 @@ static int test_disks(int i, int j, int disks) static int test(int disks, int *tests) { - addr_conv_t addr_conv[disks]; struct dma_async_tx_descriptor *tx; struct async_submit_ctl submit; struct completion cmp; From f477f5b3316f39c841aa121a219b82b3a56e7da7 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Mon, 21 Sep 2009 09:17:58 -0700 Subject: [PATCH 89/91] drivers/dma/ioat/dma_v2.c: fix warnings drivers/dma/ioat/dma_v2.c: In function 'ioat2_dma_prep_memcpy_lock': drivers/dma/ioat/dma_v2.c:680: warning: 'hw' may be used uninitialized in this function drivers/dma/ioat/dma_v2.c:681: warning: 'desc' may be used uninitialized in this function Cc: Maciej Sosnowski Signed-off-by: Andrew Morton Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 8fd0b59f190..96ffab7d37a 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -692,7 +692,8 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, /* pass */; else return NULL; - for (i = 0; i < num_descs; i++) { + i = 0; + do { size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log); desc = ioat2_get_ring_ent(ioat, idx + i); @@ -707,7 +708,7 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, dst += copy; src += copy; dump_desc_dbg(ioat, desc); - } + } while (++i < num_descs); desc->txd.flags = flags; desc->len = total_len; From cdef57dbb618608bfffda2fc32c8d0a4012a1d3a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Mon, 21 Sep 2009 09:22:29 -0700 Subject: [PATCH 90/91] ioat3: fix uninitialized var warnings drivers/dma/ioat/dma_v3.c: In function 'ioat3_prep_memset_lock': drivers/dma/ioat/dma_v3.c:439: warning: 'fill' may be used uninitialized in this function drivers/dma/ioat/dma_v3.c:437: warning: 'desc' may be used uninitialized in this function drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_xor_lock': drivers/dma/ioat/dma_v3.c:489: warning: 'xor' may be used uninitialized in this function drivers/dma/ioat/dma_v3.c:486: warning: 'desc' may be used uninitialized in this function drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_pq_lock': drivers/dma/ioat/dma_v3.c:631: warning: 'pq' may be used uninitialized in this function drivers/dma/ioat/dma_v3.c:628: warning: 'desc' may be used uninitialized in this function gcc-4.0, unlike gcc-4.3, does not see that these variables are initialized before use. Convert the descriptor loops to do-while make this initialization apparent. Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v3.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 3686dddf6bf..35d1e33afd5 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -448,7 +448,8 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value, /* pass */; else return NULL; - for (i = 0; i < num_descs; i++) { + i = 0; + do { size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); desc = ioat2_get_ring_ent(ioat, idx + i); @@ -463,7 +464,7 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value, len -= xfer_size; dest += xfer_size; dump_desc_dbg(ioat, desc); - } + } while (++i < num_descs); desc->txd.flags = flags; desc->len = total_len; @@ -518,7 +519,8 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, /* pass */; else return NULL; - for (i = 0; i < num_descs; i += 1 + with_ext) { + i = 0; + do { struct ioat_raw_descriptor *descs[2]; size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); int s; @@ -546,7 +548,7 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, len -= xfer_size; offset += xfer_size; dump_desc_dbg(ioat, desc); - } + } while ((i += 1 + with_ext) < num_descs); /* last xor descriptor carries the unmap parameters and fence bit */ desc->txd.flags = flags; @@ -664,7 +666,8 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, /* pass */; else return NULL; - for (i = 0; i < num_descs; i += 1 + with_ext) { + i = 0; + do { struct ioat_raw_descriptor *descs[2]; size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); @@ -703,7 +706,7 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, len -= xfer_size; offset += xfer_size; - } + } while ((i += 1 + with_ext) < num_descs); /* last pq descriptor carries the unmap parameters and fence bit */ desc->txd.flags = flags; From 1f6672d44c1ae7408b43c06170ec34eb0a0e9b9f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Mon, 21 Sep 2009 10:47:40 -0700 Subject: [PATCH 91/91] async_tx/raid6: add missing dma_unmap calls to the async fail case If we are unable to offload async_mult() or async_sum_product(), then unmap the buffers before falling through to the synchronous path. Signed-off-by: Dan Williams --- crypto/async_tx/async_raid6_recov.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c index 822a42d1006..6d73dde4786 100644 --- a/crypto/async_tx/async_raid6_recov.c +++ b/crypto/async_tx/async_raid6_recov.c @@ -55,6 +55,13 @@ async_sum_product(struct page *dest, struct page **srcs, unsigned char *coef, async_tx_submit(chan, tx, submit); return tx; } + + /* could not get a descriptor, unmap and fall through to + * the synchronous path + */ + dma_unmap_page(dev, dma_dest[1], len, DMA_BIDIRECTIONAL); + dma_unmap_page(dev, dma_src[0], len, DMA_TO_DEVICE); + dma_unmap_page(dev, dma_src[1], len, DMA_TO_DEVICE); } /* run the operation synchronously */ @@ -101,6 +108,12 @@ async_mult(struct page *dest, struct page *src, u8 coef, size_t len, async_tx_submit(chan, tx, submit); return tx; } + + /* could not get a descriptor, unmap and fall through to + * the synchronous path + */ + dma_unmap_page(dev, dma_dest[1], len, DMA_BIDIRECTIONAL); + dma_unmap_page(dev, dma_src[0], len, DMA_TO_DEVICE); } /* no channel available, or failed to allocate a descriptor, so