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PCI: initialize and release SR-IOV capability

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If a device has the SR-IOV capability, initialize it (set the ARI
Capable Hierarchy in the lowest numbered PF if necessary; calculate
the System Page Size for the VF MMIO, probe the VF Offset, Stride
and BARs). A lock for the VF bus allocation is also initialized if
a PF is the lowest numbered PF.

Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yu Zhao 2009-03-20 11:25:11 +08:00 committed by Jesse Barnes
parent 8293b0f629
commit d1b054da8f
8 changed files with 286 additions and 0 deletions
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10
drivers/pci/Kconfig
View file

@ -59,3 +59,13 @@ config HT_IRQ
This allows native hypertransport devices to use interrupts.
If unsure say Y.
config PCI_IOV
bool "PCI IOV support"
depends on PCI
help
I/O Virtualization is a PCI feature supported by some devices
which allows them to create virtual devices which share their
physical resources.
If unsure, say N.

2
drivers/pci/Makefile
View file

@ -29,6 +29,8 @@ obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
obj-$(CONFIG_PCI_IOV) += iov.o
#
# Some architectures use the generic PCI setup functions
#

182
drivers/pci/iov.c Normal file
View file

@ -0,0 +1,182 @@
/*
* drivers/pci/iov.c
*
* Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
*
* PCI Express I/O Virtualization (IOV) support.
* Single Root IOV 1.0
*/
#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/delay.h>
#include "pci.h"
static int sriov_init(struct pci_dev *dev, int pos)
{
int i;
int rc;
int nres;
u32 pgsz;
u16 ctrl, total, offset, stride;
struct pci_sriov *iov;
struct resource *res;
struct pci_dev *pdev;
if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
return -ENODEV;
pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
if (ctrl & PCI_SRIOV_CTRL_VFE) {
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
ssleep(1);
}
pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
if (!total)
return 0;
ctrl = 0;
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
if (pdev->is_physfn)
goto found;
pdev = NULL;
if (pci_ari_enabled(dev->bus))
ctrl |= PCI_SRIOV_CTRL_ARI;
found:
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
if (!offset || (total > 1 && !stride))
return -EIO;
pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
pgsz &= ~((1 << i) - 1);
if (!pgsz)
return -EIO;
pgsz &= ~(pgsz - 1);
pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
nres = 0;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
res = dev->resource + PCI_IOV_RESOURCES + i;
i += __pci_read_base(dev, pci_bar_unknown, res,
pos + PCI_SRIOV_BAR + i * 4);
if (!res->flags)
continue;
if (resource_size(res) & (PAGE_SIZE - 1)) {
rc = -EIO;
goto failed;
}
res->end = res->start + resource_size(res) * total - 1;
nres++;
}
iov = kzalloc(sizeof(*iov), GFP_KERNEL);
if (!iov) {
rc = -ENOMEM;
goto failed;
}
iov->pos = pos;
iov->nres = nres;
iov->ctrl = ctrl;
iov->total = total;
iov->offset = offset;
iov->stride = stride;
iov->pgsz = pgsz;
iov->self = dev;
pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
if (pdev)
iov->dev = pci_dev_get(pdev);
else {
iov->dev = dev;
mutex_init(&iov->lock);
}
dev->sriov = iov;
dev->is_physfn = 1;
return 0;
failed:
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
res = dev->resource + PCI_IOV_RESOURCES + i;
res->flags = 0;
}
return rc;
}
static void sriov_release(struct pci_dev *dev)
{
if (dev == dev->sriov->dev)
mutex_destroy(&dev->sriov->lock);
else
pci_dev_put(dev->sriov->dev);
kfree(dev->sriov);
dev->sriov = NULL;
}
/**
* pci_iov_init - initialize the IOV capability
* @dev: the PCI device
*
* Returns 0 on success, or negative on failure.
*/
int pci_iov_init(struct pci_dev *dev)
{
int pos;
if (!dev->is_pcie)
return -ENODEV;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
if (pos)
return sriov_init(dev, pos);
return -ENODEV;
}
/**
* pci_iov_release - release resources used by the IOV capability
* @dev: the PCI device
*/
void pci_iov_release(struct pci_dev *dev)
{
if (dev->is_physfn)
sriov_release(dev);
}
/**
* pci_iov_resource_bar - get position of the SR-IOV BAR
* @dev: the PCI device
* @resno: the resource number
* @type: the BAR type to be filled in
*
* Returns position of the BAR encapsulated in the SR-IOV capability.
*/
int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type)
{
if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
return 0;
BUG_ON(!dev->is_physfn);
*type = pci_bar_unknown;
return dev->sriov->pos + PCI_SRIOV_BAR +
4 * (resno - PCI_IOV_RESOURCES);
}

7
drivers/pci/pci.c
View file

@ -2360,12 +2360,19 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
*/
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
{
int reg;
if (resno < PCI_ROM_RESOURCE) {
*type = pci_bar_unknown;
return PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
*type = pci_bar_mem32;
return dev->rom_base_reg;
} else if (resno < PCI_BRIDGE_RESOURCES) {
/* device specific resource */
reg = pci_iov_resource_bar(dev, resno, type);
if (reg)
return reg;
}
dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);

37
drivers/pci/pci.h
View file

@ -201,4 +201,41 @@ resource_size_t pci_specified_resource_alignment(struct pci_dev *dev);
extern void pci_disable_bridge_window(struct pci_dev *dev);
#endif
/* Single Root I/O Virtualization */
struct pci_sriov {
int pos; /* capability position */
int nres; /* number of resources */
u32 cap; /* SR-IOV Capabilities */
u16 ctrl; /* SR-IOV Control */
u16 total; /* total VFs associated with the PF */
u16 offset; /* first VF Routing ID offset */
u16 stride; /* following VF stride */
u32 pgsz; /* page size for BAR alignment */
u8 link; /* Function Dependency Link */
struct pci_dev *dev; /* lowest numbered PF */
struct pci_dev *self; /* this PF */
struct mutex lock; /* lock for VF bus */
};
#ifdef CONFIG_PCI_IOV
extern int pci_iov_init(struct pci_dev *dev);
extern void pci_iov_release(struct pci_dev *dev);
extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
return -ENODEV;
}
static inline void pci_iov_release(struct pci_dev *dev)
{
}
static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type)
{
return 0;
}
#endif /* CONFIG_PCI_IOV */
#endif /* DRIVERS_PCI_H */

4
drivers/pci/probe.c
View file

@ -785,6 +785,7 @@ static int pci_setup_device(struct pci_dev * dev)
static void pci_release_capabilities(struct pci_dev *dev)
{
pci_vpd_release(dev);
pci_iov_release(dev);
}
/**
@ -979,6 +980,9 @@ static void pci_init_capabilities(struct pci_dev *dev)
/* Alternative Routing-ID Forwarding */
pci_enable_ari(dev);
/* Single Root I/O Virtualization */
pci_iov_init(dev);
}
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)

11
include/linux/pci.h
View file

@ -93,6 +93,12 @@ enum {
/* #6: expansion ROM resource */
PCI_ROM_RESOURCE,
/* device specific resources */
#ifdef CONFIG_PCI_IOV
PCI_IOV_RESOURCES,
PCI_IOV_RESOURCE_END = PCI_IOV_RESOURCES + PCI_SRIOV_NUM_BARS - 1,
#endif
/* resources assigned to buses behind the bridge */
#define PCI_BRIDGE_RESOURCE_NUM 4
@ -180,6 +186,7 @@ struct pci_cap_saved_state {
struct pcie_link_state;
struct pci_vpd;
struct pci_sriov;
/*
* The pci_dev structure is used to describe PCI devices.
@ -257,6 +264,7 @@ struct pci_dev {
unsigned int is_managed:1;
unsigned int is_pcie:1;
unsigned int state_saved:1;
unsigned int is_physfn:1;
pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */
@ -270,6 +278,9 @@ struct pci_dev {
struct list_head msi_list;
#endif
struct pci_vpd *vpd;
#ifdef CONFIG_PCI_IOV
struct pci_sriov *sriov; /* SR-IOV capability related */
#endif
};
extern struct pci_dev *alloc_pci_dev(void);

33
include/linux/pci_regs.h
View file

@ -375,6 +375,7 @@
#define PCI_EXP_TYPE_UPSTREAM 0x5 /* Upstream Port */
#define PCI_EXP_TYPE_DOWNSTREAM 0x6 /* Downstream Port */
#define PCI_EXP_TYPE_PCI_BRIDGE 0x7 /* PCI/PCI-X Bridge */
#define PCI_EXP_TYPE_RC_END 0x9 /* Root Complex Integrated Endpoint */
#define PCI_EXP_FLAGS_SLOT 0x0100 /* Slot implemented */
#define PCI_EXP_FLAGS_IRQ 0x3e00 /* Interrupt message number */
#define PCI_EXP_DEVCAP 4 /* Device capabilities */
@ -498,6 +499,7 @@
#define PCI_EXT_CAP_ID_DSN 3
#define PCI_EXT_CAP_ID_PWR 4
#define PCI_EXT_CAP_ID_ARI 14
#define PCI_EXT_CAP_ID_SRIOV 16
/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@ -615,4 +617,35 @@
#define PCI_ARI_CTRL_ACS 0x0002 /* ACS Function Groups Enable */
#define PCI_ARI_CTRL_FG(x) (((x) >> 4) & 7) /* Function Group */
/* Single Root I/O Virtualization */
#define PCI_SRIOV_CAP 0x04 /* SR-IOV Capabilities */
#define PCI_SRIOV_CAP_VFM 0x01 /* VF Migration Capable */
#define PCI_SRIOV_CAP_INTR(x) ((x) >> 21) /* Interrupt Message Number */
#define PCI_SRIOV_CTRL 0x08 /* SR-IOV Control */
#define PCI_SRIOV_CTRL_VFE 0x01 /* VF Enable */
#define PCI_SRIOV_CTRL_VFM 0x02 /* VF Migration Enable */
#define PCI_SRIOV_CTRL_INTR 0x04 /* VF Migration Interrupt Enable */
#define PCI_SRIOV_CTRL_MSE 0x08 /* VF Memory Space Enable */
#define PCI_SRIOV_CTRL_ARI 0x10 /* ARI Capable Hierarchy */
#define PCI_SRIOV_STATUS 0x0a /* SR-IOV Status */
#define PCI_SRIOV_STATUS_VFM 0x01 /* VF Migration Status */
#define PCI_SRIOV_INITIAL_VF 0x0c /* Initial VFs */
#define PCI_SRIOV_TOTAL_VF 0x0e /* Total VFs */
#define PCI_SRIOV_NUM_VF 0x10 /* Number of VFs */
#define PCI_SRIOV_FUNC_LINK 0x12 /* Function Dependency Link */
#define PCI_SRIOV_VF_OFFSET 0x14 /* First VF Offset */
#define PCI_SRIOV_VF_STRIDE 0x16 /* Following VF Stride */
#define PCI_SRIOV_VF_DID 0x1a /* VF Device ID */
#define PCI_SRIOV_SUP_PGSIZE 0x1c /* Supported Page Sizes */
#define PCI_SRIOV_SYS_PGSIZE 0x20 /* System Page Size */
#define PCI_SRIOV_BAR 0x24 /* VF BAR0 */
#define PCI_SRIOV_NUM_BARS 6 /* Number of VF BARs */
#define PCI_SRIOV_VFM 0x3c /* VF Migration State Array Offset*/
#define PCI_SRIOV_VFM_BIR(x) ((x) & 7) /* State BIR */
#define PCI_SRIOV_VFM_OFFSET(x) ((x) & ~7) /* State Offset */
#define PCI_SRIOV_VFM_UA 0x0 /* Inactive.Unavailable */
#define PCI_SRIOV_VFM_MI 0x1 /* Dormant.MigrateIn */
#define PCI_SRIOV_VFM_MO 0x2 /* Active.MigrateOut */
#define PCI_SRIOV_VFM_AV 0x3 /* Active.Available */
#endif /* LINUX_PCI_REGS_H */