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IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules

Browse source 
Export ib_umem_get()/ib_umem_release() and put low-level drivers in
control of when to call ib_umem_get() to pin and DMA map userspace,
rather than always calling it in ib_uverbs_reg_mr() before calling the
low-level driver's reg_user_mr method.

Also move these functions to be in the ib_core module instead of
ib_uverbs, so that driver modules using them do not depend on
ib_uverbs.

This has a number of advantages:
 - It is better design from the standpoint of making generic code a
   library that can be used or overridden by device-specific code as
   the details of specific devices dictate.
 - Drivers that do not need to pin userspace memory regions do not
   need to take the performance hit of calling ib_mem_get().  For
   example, although I have not tried to implement it in this patch,
   the ipath driver should be able to avoid pinning memory and just
   use copy_{to,from}_user() to access userspace memory regions.
 - Buffers that need special mapping treatment can be identified by
   the low-level driver.  For example, it may be possible to solve
   some Altix-specific memory ordering issues with mthca CQs in
   userspace by mapping CQ buffers with extra flags.
 - Drivers that need to pin and DMA map userspace memory for things
   other than memory regions can use ib_umem_get() directly, instead
   of hacks using extra parameters to their reg_phys_mr method.  For
   example, the mlx4 driver that is pending being merged needs to pin
   and DMA map QP and CQ buffers, but it does not need to create a
   memory key for these buffers.  So the cleanest solution is for mlx4
   to call ib_umem_get() in the create_qp and create_cq methods.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2007-03-04 16:15:11 -08:00
parent 36f021b579
commit f7c6a7b5d5
20 changed files with 357 additions and 204 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/infiniband/Kconfig
View file

@ -29,6 +29,11 @@ config INFINIBAND_USER_ACCESS
libibverbs, libibcm and a hardware driver library from
<http://www.openib.org>.
config INFINIBAND_USER_MEM
bool
depends on INFINIBAND_USER_ACCESS != n
default y
config INFINIBAND_ADDR_TRANS
bool
depends on INFINIBAND && INET

4
drivers/infiniband/core/Makefile
View file

@ -9,6 +9,7 @@ obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o ib_ucm.o \
ib_core-y := packer.o ud_header.o verbs.o sysfs.o \
device.o fmr_pool.o cache.o
ib_core-$(CONFIG_INFINIBAND_USER_MEM) += umem.o
ib_mad-y := mad.o smi.o agent.o mad_rmpp.o
@ -28,5 +29,4 @@ ib_umad-y := user_mad.o
ib_ucm-y := ucm.o
ib_uverbs-y := uverbs_main.o uverbs_cmd.o uverbs_mem.o \
uverbs_marshall.o
ib_uverbs-y := uverbs_main.o uverbs_cmd.o uverbs_marshall.o

2
drivers/infiniband/core/device.c
View file

@ -613,6 +613,8 @@ static void __exit ib_core_cleanup(void)
{
ib_cache_cleanup();
ib_sysfs_cleanup();
/* Make sure that any pending umem accounting work is done. */
flush_scheduled_work();
}
module_init(ib_core_init);

140
drivers/infiniband/core/uverbs_mem.c → drivers/infiniband/core/umem.c
View file

@ -64,35 +64,56 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
}
}
int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
void *addr, size_t size, int write)
/**
* ib_umem_get - Pin and DMA map userspace memory.
* @context: userspace context to pin memory for
* @addr: userspace virtual address to start at
* @size: length of region to pin
* @access: IB_ACCESS_xxx flags for memory being pinned
*/
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
size_t size, int access)
{
struct ib_umem *umem;
struct page **page_list;
struct ib_umem_chunk *chunk;
unsigned long locked;
unsigned long lock_limit;
unsigned long cur_base;
unsigned long npages;
int ret = 0;
int ret;
int off;
int i;
if (!can_do_mlock())
return -EPERM;
return ERR_PTR(-EPERM);
umem = kmalloc(sizeof *umem, GFP_KERNEL);
if (!umem)
return ERR_PTR(-ENOMEM);
umem->context = context;
umem->length = size;
umem->offset = addr & ~PAGE_MASK;
umem->page_size = PAGE_SIZE;
/*
* We ask for writable memory if any access flags other than
* "remote read" are set. "Local write" and "remote write"
* obviously require write access. "Remote atomic" can do
* things like fetch and add, which will modify memory, and
* "MW bind" can change permissions by binding a window.
*/
umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ);
INIT_LIST_HEAD(&umem->chunk_list);
page_list = (struct page **) __get_free_page(GFP_KERNEL);
if (!page_list)
return -ENOMEM;
if (!page_list) {
kfree(umem);
return ERR_PTR(-ENOMEM);
}
mem->user_base = (unsigned long) addr;
mem->length = size;
mem->offset = (unsigned long) addr & ~PAGE_MASK;
mem->page_size = PAGE_SIZE;
mem->writable = write;
INIT_LIST_HEAD(&mem->chunk_list);
npages = PAGE_ALIGN(size + mem->offset) >> PAGE_SHIFT;
npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT;
down_write(&current->mm->mmap_sem);
@ -104,13 +125,13 @@ int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
goto out;
}
cur_base = (unsigned long) addr & PAGE_MASK;
cur_base = addr & PAGE_MASK;
while (npages) {
ret = get_user_pages(current, current->mm, cur_base,
min_t(int, npages,
PAGE_SIZE / sizeof (struct page *)),
1, !write, page_list, NULL);
1, !umem->writable, page_list, NULL);
if (ret < 0)
goto out;
@ -136,7 +157,7 @@ int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
chunk->page_list[i].length = PAGE_SIZE;
}
chunk->nmap = ib_dma_map_sg(dev,
chunk->nmap = ib_dma_map_sg(context->device,
&chunk->page_list[0],
chunk->nents,
DMA_BIDIRECTIONAL);
@ -151,33 +172,25 @@ int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
ret -= chunk->nents;
off += chunk->nents;
list_add_tail(&chunk->list, &mem->chunk_list);
list_add_tail(&chunk->list, &umem->chunk_list);
}
ret = 0;
}
out:
if (ret < 0)
__ib_umem_release(dev, mem, 0);
else
if (ret < 0) {
__ib_umem_release(context->device, umem, 0);
kfree(umem);
} else
current->mm->locked_vm = locked;
up_write(&current->mm->mmap_sem);
free_page((unsigned long) page_list);
return ret;
}
void ib_umem_release(struct ib_device *dev, struct ib_umem *umem)
{
__ib_umem_release(dev, umem, 1);
down_write(&current->mm->mmap_sem);
current->mm->locked_vm -=
PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;
up_write(&current->mm->mmap_sem);
return ret < 0 ? ERR_PTR(ret) : umem;
}
EXPORT_SYMBOL(ib_umem_get);
static void ib_umem_account(struct work_struct *_work)
{
@ -191,35 +204,70 @@ static void ib_umem_account(struct work_struct *_work)
kfree(work);
}
void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem)
/**
* ib_umem_release - release memory pinned with ib_umem_get
* @umem: umem struct to release
*/
void ib_umem_release(struct ib_umem *umem)
{
struct ib_umem_account_work *work;
struct ib_ucontext *context = umem->context;
struct mm_struct *mm;
unsigned long diff;
__ib_umem_release(dev, umem, 1);
__ib_umem_release(umem->context->device, umem, 1);
mm = get_task_mm(current);
if (!mm)
return;
diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;
kfree(umem);
/*
* We may be called with the mm's mmap_sem already held. This
* can happen when a userspace munmap() is the call that drops
* the last reference to our file and calls our release
* method. If there are memory regions to destroy, we'll end
* up here and not be able to take the mmap_sem. Therefore we
* defer the vm_locked accounting to the system workqueue.
* up here and not be able to take the mmap_sem. In that case
* we defer the vm_locked accounting to the system workqueue.
*/
if (context->closing && !down_write_trylock(&mm->mmap_sem)) {
work = kmalloc(sizeof *work, GFP_KERNEL);
if (!work) {
mmput(mm);
return;
}
work = kmalloc(sizeof *work, GFP_KERNEL);
if (!work) {
mmput(mm);
INIT_WORK(&work->work, ib_umem_account);
work->mm = mm;
work->diff = diff;
schedule_work(&work->work);
return;
}
} else
down_write(&mm->mmap_sem);
INIT_WORK(&work->work, ib_umem_account);
work->mm = mm;
work->diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;
schedule_work(&work->work);
current->mm->locked_vm -= diff;
up_write(&mm->mmap_sem);
mmput(mm);
}
EXPORT_SYMBOL(ib_umem_release);
int ib_umem_page_count(struct ib_umem *umem)
{
struct ib_umem_chunk *chunk;
int shift;
int i;
int n;
shift = ilog2(umem->page_size);
n = 0;
list_for_each_entry(chunk, &umem->chunk_list, list)
for (i = 0; i < chunk->nmap; ++i)
n += sg_dma_len(&chunk->page_list[i]) >> shift;
return n;
}
EXPORT_SYMBOL(ib_umem_page_count);

6
drivers/infiniband/core/uverbs.h
View file

@ -45,6 +45,7 @@
#include <linux/completion.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
/*
@ -163,11 +164,6 @@ void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
void ib_uverbs_event_handler(struct ib_event_handler *handler,
struct ib_event *event);
int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
void *addr, size_t size, int write);
void ib_umem_release(struct ib_device *dev, struct ib_umem *umem);
void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem);
#define IB_UVERBS_DECLARE_CMD(name) \
ssize_t ib_uverbs_##name(struct ib_uverbs_file *file, \
const char __user *buf, int in_len, \

60
drivers/infiniband/core/uverbs_cmd.c
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2005, 2006, 2007 Cisco Systems. All rights reserved.
* Copyright (c) 2005 PathScale, Inc. All rights reserved.
* Copyright (c) 2006 Mellanox Technologies. All rights reserved.
*
@ -295,6 +295,7 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
INIT_LIST_HEAD(&ucontext->qp_list);
INIT_LIST_HEAD(&ucontext->srq_list);
INIT_LIST_HEAD(&ucontext->ah_list);
ucontext->closing = 0;
resp.num_comp_vectors = file->device->num_comp_vectors;
@ -573,7 +574,7 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
struct ib_uverbs_reg_mr cmd;
struct ib_uverbs_reg_mr_resp resp;
struct ib_udata udata;
struct ib_umem_object *obj;
struct ib_uobject *uobj;
struct ib_pd *pd;
struct ib_mr *mr;
int ret;
@ -599,35 +600,21 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
!(cmd.access_flags & IB_ACCESS_LOCAL_WRITE))
return -EINVAL;
obj = kmalloc(sizeof *obj, GFP_KERNEL);
if (!obj)
uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
if (!uobj)
return -ENOMEM;
init_uobj(&obj->uobject, 0, file->ucontext, &mr_lock_key);
down_write(&obj->uobject.mutex);
/*
* We ask for writable memory if any access flags other than
* "remote read" are set. "Local write" and "remote write"
* obviously require write access. "Remote atomic" can do
* things like fetch and add, which will modify memory, and
* "MW bind" can change permissions by binding a window.
*/
ret = ib_umem_get(file->device->ib_dev, &obj->umem,
(void *) (unsigned long) cmd.start, cmd.length,
!!(cmd.access_flags & ~IB_ACCESS_REMOTE_READ));
if (ret)
goto err_free;
obj->umem.virt_base = cmd.hca_va;
init_uobj(uobj, 0, file->ucontext, &mr_lock_key);
down_write(&uobj->mutex);
pd = idr_read_pd(cmd.pd_handle, file->ucontext);
if (!pd) {
ret = -EINVAL;
goto err_release;
goto err_free;
}
mr = pd->device->reg_user_mr(pd, &obj->umem, cmd.access_flags, &udata);
mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
cmd.access_flags, &udata);
if (IS_ERR(mr)) {
ret = PTR_ERR(mr);
goto err_put;
@ -635,19 +622,19 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
mr->device = pd->device;
mr->pd = pd;
mr->uobject = &obj->uobject;
mr->uobject = uobj;
atomic_inc(&pd->usecnt);
atomic_set(&mr->usecnt, 0);
obj->uobject.object = mr;
ret = idr_add_uobj(&ib_uverbs_mr_idr, &obj->uobject);
uobj->object = mr;
ret = idr_add_uobj(&ib_uverbs_mr_idr, uobj);
if (ret)
goto err_unreg;
memset(&resp, 0, sizeof resp);
resp.lkey = mr->lkey;
resp.rkey = mr->rkey;
resp.mr_handle = obj->uobject.id;
resp.mr_handle = uobj->id;
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp)) {
@ -658,17 +645,17 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
put_pd_read(pd);
mutex_lock(&file->mutex);
list_add_tail(&obj->uobject.list, &file->ucontext->mr_list);
list_add_tail(&uobj->list, &file->ucontext->mr_list);
mutex_unlock(&file->mutex);
obj->uobject.live = 1;
uobj->live = 1;
up_write(&obj->uobject.mutex);
up_write(&uobj->mutex);
return in_len;
err_copy:
idr_remove_uobj(&ib_uverbs_mr_idr, &obj->uobject);
idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
err_unreg:
ib_dereg_mr(mr);
@ -676,11 +663,8 @@ err_unreg:
err_put:
put_pd_read(pd);
err_release:
ib_umem_release(file->device->ib_dev, &obj->umem);
err_free:
put_uobj_write(&obj->uobject);
put_uobj_write(uobj);
return ret;
}
@ -691,7 +675,6 @@ ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
struct ib_uverbs_dereg_mr cmd;
struct ib_mr *mr;
struct ib_uobject *uobj;
struct ib_umem_object *memobj;
int ret = -EINVAL;
if (copy_from_user(&cmd, buf, sizeof cmd))
@ -701,8 +684,7 @@ ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
if (!uobj)
return -EINVAL;
memobj = container_of(uobj, struct ib_umem_object, uobject);
mr = uobj->object;
mr = uobj->object;
ret = ib_dereg_mr(mr);
if (!ret)
@ -719,8 +701,6 @@ ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
list_del(&uobj->list);
mutex_unlock(&file->mutex);
ib_umem_release(file->device->ib_dev, &memobj->umem);
put_uobj(uobj);
return in_len;

11
drivers/infiniband/core/uverbs_main.c
View file

@ -183,6 +183,8 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
if (!context)
return 0;
context->closing = 1;
list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
struct ib_ah *ah = uobj->object;
@ -230,16 +232,10 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
struct ib_mr *mr = uobj->object;
struct ib_device *mrdev = mr->device;
struct ib_umem_object *memobj;
idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
ib_dereg_mr(mr);
memobj = container_of(uobj, struct ib_umem_object, uobject);
ib_umem_release_on_close(mrdev, &memobj->umem);
kfree(memobj);
kfree(uobj);
}
list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
@ -906,7 +902,6 @@ static void __exit ib_uverbs_cleanup(void)
unregister_filesystem(&uverbs_event_fs);
class_destroy(uverbs_class);
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
flush_scheduled_work();
idr_destroy(&ib_uverbs_pd_idr);
idr_destroy(&ib_uverbs_mr_idr);
idr_destroy(&ib_uverbs_mw_idr);

42
drivers/infiniband/hw/amso1100/c2_provider.c
View file

@ -56,6 +56,7 @@
#include <asm/byteorder.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
#include "c2.h"
#include "c2_provider.h"
@ -396,6 +397,7 @@ static struct ib_mr *c2_reg_phys_mr(struct ib_pd *ib_pd,
}
mr->pd = to_c2pd(ib_pd);
mr->umem = NULL;
pr_debug("%s - page shift %d, pbl_depth %d, total_len %u, "
"*iova_start %llx, first pa %llx, last pa %llx\n",
__FUNCTION__, page_shift, pbl_depth, total_len,
@ -428,8 +430,8 @@ static struct ib_mr *c2_get_dma_mr(struct ib_pd *pd, int acc)
return c2_reg_phys_mr(pd, &bl, 1, acc, &kva);
}
static struct ib_mr *c2_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int acc, struct ib_udata *udata)
static struct ib_mr *c2_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt, int acc, struct ib_udata *udata)
{
u64 *pages;
u64 kva = 0;
@ -441,15 +443,23 @@ static struct ib_mr *c2_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
struct c2_mr *c2mr;
pr_debug("%s:%u\n", __FUNCTION__, __LINE__);
shift = ffs(region->page_size) - 1;
c2mr = kmalloc(sizeof(*c2mr), GFP_KERNEL);
if (!c2mr)
return ERR_PTR(-ENOMEM);
c2mr->pd = c2pd;
c2mr->umem = ib_umem_get(pd->uobject->context, start, length, acc);
if (IS_ERR(c2mr->umem)) {
err = PTR_ERR(c2mr->umem);
kfree(c2mr);
return ERR_PTR(err);
}
shift = ffs(c2mr->umem->page_size) - 1;
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &c2mr->umem->chunk_list, list)
n += chunk->nents;
pages = kmalloc(n * sizeof(u64), GFP_KERNEL);
@ -459,35 +469,34 @@ static struct ib_mr *c2_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
}
i = 0;
list_for_each_entry(chunk, &region->chunk_list, list) {
list_for_each_entry(chunk, &c2mr->umem->chunk_list, list) {
for (j = 0; j < chunk->nmap; ++j) {
len = sg_dma_len(&chunk->page_list[j]) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] =
sg_dma_address(&chunk->page_list[j]) +
(region->page_size * k);
(c2mr->umem->page_size * k);
}
}
}
kva = (u64)region->virt_base;
kva = virt;
err = c2_nsmr_register_phys_kern(to_c2dev(pd->device),
pages,
region->page_size,
c2mr->umem->page_size,
i,
region->length,
region->offset,
length,
c2mr->umem->offset,
&kva,
c2_convert_access(acc),
c2mr);
kfree(pages);
if (err) {
kfree(c2mr);
return ERR_PTR(err);
}
if (err)
goto err;
return &c2mr->ibmr;
err:
ib_umem_release(c2mr->umem);
kfree(c2mr);
return ERR_PTR(err);
}
@ -502,8 +511,11 @@ static int c2_dereg_mr(struct ib_mr *ib_mr)
err = c2_stag_dealloc(to_c2dev(ib_mr->device), ib_mr->lkey);
if (err)
pr_debug("c2_stag_dealloc failed: %d\n", err);
else
else {
if (mr->umem)
ib_umem_release(mr->umem);
kfree(mr);
}
return err;
}

1
drivers/infiniband/hw/amso1100/c2_provider.h
View file

@ -73,6 +73,7 @@ struct c2_pd {
struct c2_mr {
struct ib_mr ibmr;
struct c2_pd *pd;
struct ib_umem *umem;
};
struct c2_av;

28
drivers/infiniband/hw/cxgb3/iwch_provider.c
View file

@ -47,6 +47,7 @@
#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
#include "cxio_hal.h"
@ -443,6 +444,8 @@ static int iwch_dereg_mr(struct ib_mr *ib_mr)
remove_handle(rhp, &rhp->mmidr, mmid);
if (mhp->kva)
kfree((void *) (unsigned long) mhp->kva);
if (mhp->umem)
ib_umem_release(mhp->umem);
PDBG("%s mmid 0x%x ptr %p\n", __FUNCTION__, mmid, mhp);
kfree(mhp);
return 0;
@ -577,8 +580,8 @@ static int iwch_reregister_phys_mem(struct ib_mr *mr,
}
static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int acc, struct ib_udata *udata)
static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt, int acc, struct ib_udata *udata)
{
__be64 *pages;
int shift, n, len;
@ -591,7 +594,6 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
struct iwch_reg_user_mr_resp uresp;
PDBG("%s ib_pd %p\n", __FUNCTION__, pd);
shift = ffs(region->page_size) - 1;
php = to_iwch_pd(pd);
rhp = php->rhp;
@ -599,8 +601,17 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
if (!mhp)
return ERR_PTR(-ENOMEM);
mhp->umem = ib_umem_get(pd->uobject->context, start, length, acc);
if (IS_ERR(mhp->umem)) {
err = PTR_ERR(mhp->umem);
kfree(mhp);
return ERR_PTR(err);
}
shift = ffs(mhp->umem->page_size) - 1;
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &mhp->umem->chunk_list, list)
n += chunk->nents;
pages = kmalloc(n * sizeof(u64), GFP_KERNEL);
@ -611,13 +622,13 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
i = n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &mhp->umem->chunk_list, list)
for (j = 0; j < chunk->nmap; ++j) {
len = sg_dma_len(&chunk->page_list[j]) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = cpu_to_be64(sg_dma_address(
&chunk->page_list[j]) +
region->page_size * k);
mhp->umem->page_size * k);
}
}
@ -625,9 +636,9 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
mhp->attr.pdid = php->pdid;
mhp->attr.zbva = 0;
mhp->attr.perms = iwch_ib_to_tpt_access(acc);
mhp->attr.va_fbo = region->virt_base;
mhp->attr.va_fbo = virt;
mhp->attr.page_size = shift - 12;
mhp->attr.len = (u32) region->length;
mhp->attr.len = (u32) length;
mhp->attr.pbl_size = i;
err = iwch_register_mem(rhp, php, mhp, shift, pages);
kfree(pages);
@ -650,6 +661,7 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
return &mhp->ibmr;
err:
ib_umem_release(mhp->umem);
kfree(mhp);
return ERR_PTR(err);
}

1
drivers/infiniband/hw/cxgb3/iwch_provider.h
View file

@ -73,6 +73,7 @@ struct tpt_attributes {
struct iwch_mr {
struct ib_mr ibmr;
struct ib_umem *umem;
struct iwch_dev *rhp;
u64 kva;
struct tpt_attributes attr;

1
drivers/infiniband/hw/ehca/ehca_classes.h
View file

@ -176,6 +176,7 @@ struct ehca_mr {
struct ib_mr ib_mr; /* must always be first in ehca_mr */
struct ib_fmr ib_fmr; /* must always be first in ehca_mr */
} ib;
struct ib_umem *umem;
spinlock_t mrlock;
enum ehca_mr_flag flags;

3
drivers/infiniband/hw/ehca/ehca_iverbs.h
View file

@ -78,8 +78,7 @@ struct ib_mr *ehca_reg_phys_mr(struct ib_pd *pd,
int num_phys_buf,
int mr_access_flags, u64 *iova_start);
struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd,
struct ib_umem *region,
struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, u64 virt,
int mr_access_flags, struct ib_udata *udata);
int ehca_rereg_phys_mr(struct ib_mr *mr,

69
drivers/infiniband/hw/ehca/ehca_mrmw.c
View file

@ -39,6 +39,8 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <rdma/ib_umem.h>
#include <asm/current.h>
#include "ehca_iverbs.h"
@ -238,10 +240,8 @@ reg_phys_mr_exit0:
/*----------------------------------------------------------------------*/
struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd,
struct ib_umem *region,
int mr_access_flags,
struct ib_udata *udata)
struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, u64 virt,
int mr_access_flags, struct ib_udata *udata)
{
struct ib_mr *ib_mr;
struct ehca_mr *e_mr;
@ -257,11 +257,7 @@ struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd,
ehca_gen_err("bad pd=%p", pd);
return ERR_PTR(-EFAULT);
}
if (!region) {
ehca_err(pd->device, "bad input values: region=%p", region);
ib_mr = ERR_PTR(-EINVAL);
goto reg_user_mr_exit0;
}
if (((mr_access_flags & IB_ACCESS_REMOTE_WRITE) &&
!(mr_access_flags & IB_ACCESS_LOCAL_WRITE)) ||
((mr_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
@ -275,17 +271,10 @@ struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd,
ib_mr = ERR_PTR(-EINVAL);
goto reg_user_mr_exit0;
}
if (region->page_size != PAGE_SIZE) {
ehca_err(pd->device, "page size not supported, "
"region->page_size=%x", region->page_size);
ib_mr = ERR_PTR(-EINVAL);
goto reg_user_mr_exit0;
}
if ((region->length == 0) ||
((region->virt_base + region->length) < region->virt_base)) {
if (length == 0 || virt + length < virt) {
ehca_err(pd->device, "bad input values: length=%lx "
"virt_base=%lx", region->length, region->virt_base);
"virt_base=%lx", length, virt);
ib_mr = ERR_PTR(-EINVAL);
goto reg_user_mr_exit0;
}
@ -297,40 +286,55 @@ struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd,
goto reg_user_mr_exit0;
}
e_mr->umem = ib_umem_get(pd->uobject->context, start, length,
mr_access_flags);
if (IS_ERR(e_mr->umem)) {
ib_mr = (void *) e_mr->umem;
goto reg_user_mr_exit1;
}
if (e_mr->umem->page_size != PAGE_SIZE) {
ehca_err(pd->device, "page size not supported, "
"e_mr->umem->page_size=%x", e_mr->umem->page_size);
ib_mr = ERR_PTR(-EINVAL);
goto reg_user_mr_exit2;
}
/* determine number of MR pages */
num_pages_mr = (((region->virt_base % PAGE_SIZE) + region->length +
PAGE_SIZE - 1) / PAGE_SIZE);
num_pages_4k = (((region->virt_base % EHCA_PAGESIZE) + region->length +
EHCA_PAGESIZE - 1) / EHCA_PAGESIZE);
num_pages_mr = (((virt % PAGE_SIZE) + length + PAGE_SIZE - 1) /
PAGE_SIZE);
num_pages_4k = (((virt % EHCA_PAGESIZE) + length + EHCA_PAGESIZE - 1) /
EHCA_PAGESIZE);
/* register MR on HCA */
pginfo.type = EHCA_MR_PGI_USER;
pginfo.num_pages = num_pages_mr;
pginfo.num_4k = num_pages_4k;
pginfo.region = region;
pginfo.next_4k = region->offset / EHCA_PAGESIZE;
pginfo.region = e_mr->umem;
pginfo.next_4k = e_mr->umem->offset / EHCA_PAGESIZE;
pginfo.next_chunk = list_prepare_entry(pginfo.next_chunk,
(&region->chunk_list),
(&e_mr->umem->chunk_list),
list);
ret = ehca_reg_mr(shca, e_mr, (u64*)region->virt_base,
region->length, mr_access_flags, e_pd, &pginfo,
&e_mr->ib.ib_mr.lkey, &e_mr->ib.ib_mr.rkey);
ret = ehca_reg_mr(shca, e_mr, (u64*) virt, length, mr_access_flags, e_pd,
&pginfo, &e_mr->ib.ib_mr.lkey, &e_mr->ib.ib_mr.rkey);
if (ret) {
ib_mr = ERR_PTR(ret);
goto reg_user_mr_exit1;
goto reg_user_mr_exit2;
}
/* successful registration of all pages */
return &e_mr->ib.ib_mr;
reg_user_mr_exit2:
ib_umem_release(e_mr->umem);
reg_user_mr_exit1:
ehca_mr_delete(e_mr);
reg_user_mr_exit0:
if (IS_ERR(ib_mr))
ehca_err(pd->device, "rc=%lx pd=%p region=%p mr_access_flags=%x"
ehca_err(pd->device, "rc=%lx pd=%p mr_access_flags=%x"
" udata=%p",
PTR_ERR(ib_mr), pd, region, mr_access_flags, udata);
PTR_ERR(ib_mr), pd, mr_access_flags, udata);
return ib_mr;
} /* end ehca_reg_user_mr() */
@ -596,6 +600,9 @@ int ehca_dereg_mr(struct ib_mr *mr)
goto dereg_mr_exit0;
}
if (e_mr->umem)
ib_umem_release(e_mr->umem);
/* successful deregistration */
ehca_mr_delete(e_mr);

38
drivers/infiniband/hw/ipath/ipath_mr.c
View file

@ -31,6 +31,7 @@
* SOFTWARE.
*/
#include <rdma/ib_umem.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_smi.h>
@ -147,6 +148,7 @@ struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
mr->mr.offset = 0;
mr->mr.access_flags = acc;
mr->mr.max_segs = num_phys_buf;
mr->umem = NULL;
m = 0;
n = 0;
@ -170,46 +172,56 @@ bail:
/**
* ipath_reg_user_mr - register a userspace memory region
* @pd: protection domain for this memory region
* @region: the user memory region
* @start: starting userspace address
* @length: length of region to register
* @virt_addr: virtual address to use (from HCA's point of view)
* @mr_access_flags: access flags for this memory region
* @udata: unused by the InfiniPath driver
*
* Returns the memory region on success, otherwise returns an errno.
*/
struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int mr_access_flags, struct ib_udata *udata)
struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt_addr, int mr_access_flags,
struct ib_udata *udata)
{
struct ipath_mr *mr;
struct ib_umem *umem;
struct ib_umem_chunk *chunk;
int n, m, i;
struct ib_mr *ret;
if (region->length == 0) {
if (length == 0) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
umem = ib_umem_get(pd->uobject->context, start, length, mr_access_flags);
if (IS_ERR(umem))
return (void *) umem;
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &umem->chunk_list, list)
n += chunk->nents;
mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
if (!mr) {
ret = ERR_PTR(-ENOMEM);
ib_umem_release(umem);
goto bail;
}
mr->mr.pd = pd;
mr->mr.user_base = region->user_base;
mr->mr.iova = region->virt_base;
mr->mr.length = region->length;
mr->mr.offset = region->offset;
mr->mr.user_base = start;
mr->mr.iova = virt_addr;
mr->mr.length = length;
mr->mr.offset = umem->offset;
mr->mr.access_flags = mr_access_flags;
mr->mr.max_segs = n;
mr->umem = umem;
m = 0;
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list) {
list_for_each_entry(chunk, &umem->chunk_list, list) {
for (i = 0; i < chunk->nents; i++) {
void *vaddr;
@ -219,7 +231,7 @@ struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
goto bail;
}
mr->mr.map[m]->segs[n].vaddr = vaddr;
mr->mr.map[m]->segs[n].length = region->page_size;
mr->mr.map[m]->segs[n].length = umem->page_size;
n++;
if (n == IPATH_SEGSZ) {
m++;
@ -253,6 +265,10 @@ int ipath_dereg_mr(struct ib_mr *ibmr)
i--;
kfree(mr->mr.map[i]);
}
if (mr->umem)
ib_umem_release(mr->umem);
kfree(mr);
return 0;
}

5
drivers/infiniband/hw/ipath/ipath_verbs.h
View file

@ -251,6 +251,7 @@ struct ipath_sge {
/* Memory region */
struct ipath_mr {
struct ib_mr ibmr;
struct ib_umem *umem;
struct ipath_mregion mr; /* must be last */
};
@ -751,8 +752,8 @@ struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
struct ib_phys_buf *buffer_list,
int num_phys_buf, int acc, u64 *iova_start);
struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int mr_access_flags,
struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt_addr, int mr_access_flags,
struct ib_udata *udata);
int ipath_dereg_mr(struct ib_mr *ibmr);

38
drivers/infiniband/hw/mthca/mthca_provider.c
View file

@ -37,6 +37,7 @@
*/
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>
#include <linux/mm.h>
@ -908,6 +909,8 @@ static struct ib_mr *mthca_get_dma_mr(struct ib_pd *pd, int acc)
return ERR_PTR(err);
}
mr->umem = NULL;
return &mr->ibmr;
}
@ -1003,11 +1006,13 @@ static struct ib_mr *mthca_reg_phys_mr(struct ib_pd *pd,
}
kfree(page_list);
mr->umem = NULL;
return &mr->ibmr;
}
static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int acc, struct ib_udata *udata)
static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt, int acc, struct ib_udata *udata)
{
struct mthca_dev *dev = to_mdev(pd->device);
struct ib_umem_chunk *chunk;
@ -1018,20 +1023,26 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
int err = 0;
int write_mtt_size;
shift = ffs(region->page_size) - 1;
mr = kmalloc(sizeof *mr, GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
mr->umem = ib_umem_get(pd->uobject->context, start, length, acc);
if (IS_ERR(mr->umem)) {
err = PTR_ERR(mr->umem);
goto err;
}
shift = ffs(mr->umem->page_size) - 1;
n = 0;
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &mr->umem->chunk_list, list)
n += chunk->nents;
mr->mtt = mthca_alloc_mtt(dev, n);
if (IS_ERR(mr->mtt)) {
err = PTR_ERR(mr->mtt);
goto err;
goto err_umem;
}
pages = (u64 *) __get_free_page(GFP_KERNEL);
@ -1044,12 +1055,12 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
write_mtt_size = min(mthca_write_mtt_size(dev), (int) (PAGE_SIZE / sizeof *pages));
list_for_each_entry(chunk, &region->chunk_list, list)
list_for_each_entry(chunk, &mr->umem->chunk_list, list)
for (j = 0; j < chunk->nmap; ++j) {
len = sg_dma_len(&chunk->page_list[j]) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = sg_dma_address(&chunk->page_list[j]) +
region->page_size * k;
mr->umem->page_size * k;
/*
* Be friendly to write_mtt and pass it chunks
* of appropriate size.
@ -1071,8 +1082,8 @@ mtt_done:
if (err)
goto err_mtt;
err = mthca_mr_alloc(dev, to_mpd(pd)->pd_num, shift, region->virt_base,
region->length, convert_access(acc), mr);
err = mthca_mr_alloc(dev, to_mpd(pd)->pd_num, shift, virt, length,
convert_access(acc), mr);
if (err)
goto err_mtt;
@ -1082,6 +1093,9 @@ mtt_done:
err_mtt:
mthca_free_mtt(dev, mr->mtt);
err_umem:
ib_umem_release(mr->umem);
err:
kfree(mr);
return ERR_PTR(err);
@ -1090,8 +1104,12 @@ err:
static int mthca_dereg_mr(struct ib_mr *mr)
{
struct mthca_mr *mmr = to_mmr(mr);
mthca_free_mr(to_mdev(mr->device), mmr);
if (mmr->umem)
ib_umem_release(mmr->umem);
kfree(mmr);
return 0;
}

1
drivers/infiniband/hw/mthca/mthca_provider.h
View file

@ -73,6 +73,7 @@ struct mthca_mtt;
struct mthca_mr {
struct ib_mr ibmr;
struct ib_umem *umem;
struct mthca_mtt *mtt;
};

78
include/rdma/ib_umem.h Normal file
View file

@ -0,0 +1,78 @@
/*
* Copyright (c) 2007 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef IB_UMEM_H
#define IB_UMEM_H
#include <linux/list.h>
#include <linux/scatterlist.h>
struct ib_ucontext;
struct ib_umem {
struct ib_ucontext *context;
size_t length;
int offset;
int page_size;
int writable;
struct list_head chunk_list;
};
struct ib_umem_chunk {
struct list_head list;
int nents;
int nmap;
struct scatterlist page_list[0];
};
#ifdef CONFIG_INFINIBAND_USER_MEM
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
size_t size, int access);
void ib_umem_release(struct ib_umem *umem);
int ib_umem_page_count(struct ib_umem *umem);
#else /* CONFIG_INFINIBAND_USER_MEM */
#include <linux/err.h>
static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr, size_t size,
int access) {
return ERR_PTR(-EINVAL);
}
static inline void ib_umem_release(struct ib_umem *umem) { }
static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
#endif /* CONFIG_INFINIBAND_USER_MEM */
#endif /* IB_UMEM_H */

28
include/rdma/ib_verbs.h
View file

@ -5,7 +5,7 @@
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2005, 2006, 2007 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
@ -710,6 +710,7 @@ struct ib_ucontext {
struct list_head qp_list;
struct list_head srq_list;
struct list_head ah_list;
int closing;
};
struct ib_uobject {
@ -723,23 +724,6 @@ struct ib_uobject {
int live;
};
struct ib_umem {
unsigned long user_base;
unsigned long virt_base;
size_t length;
int offset;
int page_size;
int writable;
struct list_head chunk_list;
};
struct ib_umem_chunk {
struct list_head list;
int nents;
int nmap;
struct scatterlist page_list[0];
};
struct ib_udata {
void __user *inbuf;
void __user *outbuf;
@ -752,11 +736,6 @@ struct ib_udata {
((void *) &((struct ib_umem_chunk *) 0)->page_list[1] - \
(void *) &((struct ib_umem_chunk *) 0)->page_list[0]))
struct ib_umem_object {
struct ib_uobject uobject;
struct ib_umem umem;
};
struct ib_pd {
struct ib_device *device;
struct ib_uobject *uobject;
@ -1003,7 +982,8 @@ struct ib_device {
int mr_access_flags,
u64 *iova_start);
struct ib_mr * (*reg_user_mr)(struct ib_pd *pd,
struct ib_umem *region,
u64 start, u64 length,
u64 virt_addr,
int mr_access_flags,
struct ib_udata *udata);
int (*query_mr)(struct ib_mr *mr,