PCI: add SR-IOV API for Physical Function driver
Add or remove the Virtual Function when the SR-IOV is enabled or disabled by the device driver. This can happen anytime rather than only at the device probe stage. 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
Jesse Barnes
parent
480b93b783
commit
dd7cc44d0b
|
|
@ -13,6 +13,7 @@
|
|||
#include <linux/delay.h>
|
||||
#include "pci.h"
|
||||
|
||||
#define VIRTFN_ID_LEN 16
|
||||
|
||||
static inline u8 virtfn_bus(struct pci_dev *dev, int id)
|
||||
{
|
||||
|
|
@ -26,6 +27,284 @@ static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
|
|||
dev->sriov->stride * id) & 0xff;
|
||||
}
|
||||
|
||||
static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
|
||||
{
|
||||
int rc;
|
||||
struct pci_bus *child;
|
||||
|
||||
if (bus->number == busnr)
|
||||
return bus;
|
||||
|
||||
child = pci_find_bus(pci_domain_nr(bus), busnr);
|
||||
if (child)
|
||||
return child;
|
||||
|
||||
child = pci_add_new_bus(bus, NULL, busnr);
|
||||
if (!child)
|
||||
return NULL;
|
||||
|
||||
child->subordinate = busnr;
|
||||
child->dev.parent = bus->bridge;
|
||||
rc = pci_bus_add_child(child);
|
||||
if (rc) {
|
||||
pci_remove_bus(child);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return child;
|
||||
}
|
||||
|
||||
static void virtfn_remove_bus(struct pci_bus *bus, int busnr)
|
||||
{
|
||||
struct pci_bus *child;
|
||||
|
||||
if (bus->number == busnr)
|
||||
return;
|
||||
|
||||
child = pci_find_bus(pci_domain_nr(bus), busnr);
|
||||
BUG_ON(!child);
|
||||
|
||||
if (list_empty(&child->devices))
|
||||
pci_remove_bus(child);
|
||||
}
|
||||
|
||||
static int virtfn_add(struct pci_dev *dev, int id, int reset)
|
||||
{
|
||||
int i;
|
||||
int rc;
|
||||
u64 size;
|
||||
char buf[VIRTFN_ID_LEN];
|
||||
struct pci_dev *virtfn;
|
||||
struct resource *res;
|
||||
struct pci_sriov *iov = dev->sriov;
|
||||
|
||||
virtfn = alloc_pci_dev();
|
||||
if (!virtfn)
|
||||
return -ENOMEM;
|
||||
|
||||
mutex_lock(&iov->dev->sriov->lock);
|
||||
virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
|
||||
if (!virtfn->bus) {
|
||||
kfree(virtfn);
|
||||
mutex_unlock(&iov->dev->sriov->lock);
|
||||
return -ENOMEM;
|
||||
}
|
||||
virtfn->devfn = virtfn_devfn(dev, id);
|
||||
virtfn->vendor = dev->vendor;
|
||||
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
|
||||
pci_setup_device(virtfn);
|
||||
virtfn->dev.parent = dev->dev.parent;
|
||||
|
||||
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
||||
res = dev->resource + PCI_IOV_RESOURCES + i;
|
||||
if (!res->parent)
|
||||
continue;
|
||||
virtfn->resource[i].name = pci_name(virtfn);
|
||||
virtfn->resource[i].flags = res->flags;
|
||||
size = resource_size(res);
|
||||
do_div(size, iov->total);
|
||||
virtfn->resource[i].start = res->start + size * id;
|
||||
virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
|
||||
rc = request_resource(res, &virtfn->resource[i]);
|
||||
BUG_ON(rc);
|
||||
}
|
||||
|
||||
if (reset)
|
||||
pci_execute_reset_function(virtfn);
|
||||
|
||||
pci_device_add(virtfn, virtfn->bus);
|
||||
mutex_unlock(&iov->dev->sriov->lock);
|
||||
|
||||
virtfn->physfn = pci_dev_get(dev);
|
||||
virtfn->is_virtfn = 1;
|
||||
|
||||
rc = pci_bus_add_device(virtfn);
|
||||
if (rc)
|
||||
goto failed1;
|
||||
sprintf(buf, "virtfn%u", id);
|
||||
rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
|
||||
if (rc)
|
||||
goto failed1;
|
||||
rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
|
||||
if (rc)
|
||||
goto failed2;
|
||||
|
||||
kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
|
||||
|
||||
return 0;
|
||||
|
||||
failed2:
|
||||
sysfs_remove_link(&dev->dev.kobj, buf);
|
||||
failed1:
|
||||
pci_dev_put(dev);
|
||||
mutex_lock(&iov->dev->sriov->lock);
|
||||
pci_remove_bus_device(virtfn);
|
||||
virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
|
||||
mutex_unlock(&iov->dev->sriov->lock);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void virtfn_remove(struct pci_dev *dev, int id, int reset)
|
||||
{
|
||||
char buf[VIRTFN_ID_LEN];
|
||||
struct pci_bus *bus;
|
||||
struct pci_dev *virtfn;
|
||||
struct pci_sriov *iov = dev->sriov;
|
||||
|
||||
bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
|
||||
if (!virtfn)
|
||||
return;
|
||||
|
||||
pci_dev_put(virtfn);
|
||||
|
||||
if (reset) {
|
||||
device_release_driver(&virtfn->dev);
|
||||
pci_execute_reset_function(virtfn);
|
||||
}
|
||||
|
||||
sprintf(buf, "virtfn%u", id);
|
||||
sysfs_remove_link(&dev->dev.kobj, buf);
|
||||
sysfs_remove_link(&virtfn->dev.kobj, "physfn");
|
||||
|
||||
mutex_lock(&iov->dev->sriov->lock);
|
||||
pci_remove_bus_device(virtfn);
|
||||
virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
|
||||
mutex_unlock(&iov->dev->sriov->lock);
|
||||
|
||||
pci_dev_put(dev);
|
||||
}
|
||||
|
||||
static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
|
||||
{
|
||||
int rc;
|
||||
int i, j;
|
||||
int nres;
|
||||
u16 offset, stride, initial;
|
||||
struct resource *res;
|
||||
struct pci_dev *pdev;
|
||||
struct pci_sriov *iov = dev->sriov;
|
||||
|
||||
if (!nr_virtfn)
|
||||
return 0;
|
||||
|
||||
if (iov->nr_virtfn)
|
||||
return -EINVAL;
|
||||
|
||||
pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
|
||||
if (initial > iov->total ||
|
||||
(!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
|
||||
return -EIO;
|
||||
|
||||
if (nr_virtfn < 0 || nr_virtfn > iov->total ||
|
||||
(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
|
||||
return -EINVAL;
|
||||
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
|
||||
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
|
||||
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
|
||||
if (!offset || (nr_virtfn > 1 && !stride))
|
||||
return -EIO;
|
||||
|
||||
nres = 0;
|
||||
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
||||
res = dev->resource + PCI_IOV_RESOURCES + i;
|
||||
if (res->parent)
|
||||
nres++;
|
||||
}
|
||||
if (nres != iov->nres) {
|
||||
dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
iov->offset = offset;
|
||||
iov->stride = stride;
|
||||
|
||||
if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) {
|
||||
dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
if (iov->link != dev->devfn) {
|
||||
pdev = pci_get_slot(dev->bus, iov->link);
|
||||
if (!pdev)
|
||||
return -ENODEV;
|
||||
|
||||
pci_dev_put(pdev);
|
||||
|
||||
if (!pdev->is_physfn)
|
||||
return -ENODEV;
|
||||
|
||||
rc = sysfs_create_link(&dev->dev.kobj,
|
||||
&pdev->dev.kobj, "dep_link");
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
|
||||
pci_block_user_cfg_access(dev);
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
||||
msleep(100);
|
||||
pci_unblock_user_cfg_access(dev);
|
||||
|
||||
iov->initial = initial;
|
||||
if (nr_virtfn < initial)
|
||||
initial = nr_virtfn;
|
||||
|
||||
for (i = 0; i < initial; i++) {
|
||||
rc = virtfn_add(dev, i, 0);
|
||||
if (rc)
|
||||
goto failed;
|
||||
}
|
||||
|
||||
kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
|
||||
iov->nr_virtfn = nr_virtfn;
|
||||
|
||||
return 0;
|
||||
|
||||
failed:
|
||||
for (j = 0; j < i; j++)
|
||||
virtfn_remove(dev, j, 0);
|
||||
|
||||
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
|
||||
pci_block_user_cfg_access(dev);
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
||||
ssleep(1);
|
||||
pci_unblock_user_cfg_access(dev);
|
||||
|
||||
if (iov->link != dev->devfn)
|
||||
sysfs_remove_link(&dev->dev.kobj, "dep_link");
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void sriov_disable(struct pci_dev *dev)
|
||||
{
|
||||
int i;
|
||||
struct pci_sriov *iov = dev->sriov;
|
||||
|
||||
if (!iov->nr_virtfn)
|
||||
return;
|
||||
|
||||
for (i = 0; i < iov->nr_virtfn; i++)
|
||||
virtfn_remove(dev, i, 0);
|
||||
|
||||
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
|
||||
pci_block_user_cfg_access(dev);
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
||||
ssleep(1);
|
||||
pci_unblock_user_cfg_access(dev);
|
||||
|
||||
if (iov->link != dev->devfn)
|
||||
sysfs_remove_link(&dev->dev.kobj, "dep_link");
|
||||
|
||||
iov->nr_virtfn = 0;
|
||||
}
|
||||
|
||||
static int sriov_init(struct pci_dev *dev, int pos)
|
||||
{
|
||||
int i;
|
||||
|
|
@ -132,6 +411,8 @@ failed:
|
|||
|
||||
static void sriov_release(struct pci_dev *dev)
|
||||
{
|
||||
BUG_ON(dev->sriov->nr_virtfn);
|
||||
|
||||
if (dev == dev->sriov->dev)
|
||||
mutex_destroy(&dev->sriov->lock);
|
||||
else
|
||||
|
|
@ -155,6 +436,7 @@ static void sriov_restore_state(struct pci_dev *dev)
|
|||
pci_update_resource(dev, i);
|
||||
|
||||
pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
|
||||
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
||||
if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
|
||||
msleep(100);
|
||||
|
|
@ -245,3 +527,35 @@ int pci_iov_bus_range(struct pci_bus *bus)
|
|||
|
||||
return max ? max - bus->number : 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* pci_enable_sriov - enable the SR-IOV capability
|
||||
* @dev: the PCI device
|
||||
*
|
||||
* Returns 0 on success, or negative on failure.
|
||||
*/
|
||||
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
if (!dev->is_physfn)
|
||||
return -ENODEV;
|
||||
|
||||
return sriov_enable(dev, nr_virtfn);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_enable_sriov);
|
||||
|
||||
/**
|
||||
* pci_disable_sriov - disable the SR-IOV capability
|
||||
* @dev: the PCI device
|
||||
*/
|
||||
void pci_disable_sriov(struct pci_dev *dev)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
if (!dev->is_physfn)
|
||||
return;
|
||||
|
||||
sriov_disable(dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_disable_sriov);
|
||||
|
|
|
|||
|
|
@ -209,6 +209,8 @@ struct pci_sriov {
|
|||
u32 cap; /* SR-IOV Capabilities */
|
||||
u16 ctrl; /* SR-IOV Control */
|
||||
u16 total; /* total VFs associated with the PF */
|
||||
u16 initial; /* initial VFs associated with the PF */
|
||||
u16 nr_virtfn; /* number of VFs available */
|
||||
u16 offset; /* first VF Routing ID offset */
|
||||
u16 stride; /* following VF stride */
|
||||
u32 pgsz; /* page size for BAR alignment */
|
||||
|
|
|
|||
|
|
@ -265,6 +265,7 @@ struct pci_dev {
|
|||
unsigned int is_pcie:1;
|
||||
unsigned int state_saved:1;
|
||||
unsigned int is_physfn:1;
|
||||
unsigned int is_virtfn:1;
|
||||
pci_dev_flags_t dev_flags;
|
||||
atomic_t enable_cnt; /* pci_enable_device has been called */
|
||||
|
||||
|
|
@ -279,7 +280,10 @@ struct pci_dev {
|
|||
#endif
|
||||
struct pci_vpd *vpd;
|
||||
#ifdef CONFIG_PCI_IOV
|
||||
struct pci_sriov *sriov; /* SR-IOV capability related */
|
||||
union {
|
||||
struct pci_sriov *sriov; /* SR-IOV capability related */
|
||||
struct pci_dev *physfn; /* the PF this VF is associated with */
|
||||
};
|
||||
#endif
|
||||
};
|
||||
|
||||
|
|
@ -1212,5 +1216,18 @@ int pci_ext_cfg_avail(struct pci_dev *dev);
|
|||
|
||||
void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
|
||||
|
||||
#ifdef CONFIG_PCI_IOV
|
||||
extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
|
||||
extern void pci_disable_sriov(struct pci_dev *dev);
|
||||
#else
|
||||
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline void pci_disable_sriov(struct pci_dev *dev)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
#endif /* LINUX_PCI_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue