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PCI: restore saved SR-IOV state

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Restore the volatile registers in the SR-IOV capability after the
D3->D0 transition.

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 11:25:12 +08:00 committed by Jesse Barnes
parent d1b054da8f
commit 8c5cdb6adc
3 changed files with 34 additions and 0 deletions
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29
drivers/pci/iov.c
View file

@ -129,6 +129,25 @@ static void sriov_release(struct pci_dev *dev)
dev->sriov = NULL;
}
static void sriov_restore_state(struct pci_dev *dev)
{
int i;
u16 ctrl;
struct pci_sriov *iov = dev->sriov;
pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
if (ctrl & PCI_SRIOV_CTRL_VFE)
return;
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
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_CTRL, iov->ctrl);
if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
msleep(100);
}
/**
* pci_iov_init - initialize the IOV capability
* @dev: the PCI device
@ -180,3 +199,13 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno,
return dev->sriov->pos + PCI_SRIOV_BAR +
4 * (resno - PCI_IOV_RESOURCES);
}
/**
* pci_restore_iov_state - restore the state of the IOV capability
* @dev: the PCI device
*/
void pci_restore_iov_state(struct pci_dev *dev)
{
if (dev->is_physfn)
sriov_restore_state(dev);
}

1
drivers/pci/pci.c
View file

@ -775,6 +775,7 @@ pci_restore_state(struct pci_dev *dev)
}
pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
pci_restore_iov_state(dev);
return 0;
}

4
drivers/pci/pci.h
View file

@ -222,6 +222,7 @@ 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);
extern void pci_restore_iov_state(struct pci_dev *dev);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
@ -236,6 +237,9 @@ static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
{
return 0;
}
static inline void pci_restore_iov_state(struct pci_dev *dev)
{
}
#endif /* CONFIG_PCI_IOV */
#endif /* DRIVERS_PCI_H */