diff options
| author | Yu Zhao <yu.zhao@intel.com> | 2009-03-20 04:25:12 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 18:48:24 +0100 |
| commit | 8c5cdb6adc6688b9b8fd82ea4a5cf4674dabad79 (patch) | |
| tree | 79fbfde0cedf983b87cf6f782c108000d5c5752d /drivers/pci | |
| parent | PCI: initialize and release SR-IOV capability (diff) | |
| download | linux-8c5cdb6adc6688b9b8fd82ea4a5cf4674dabad79.tar.xz linux-8c5cdb6adc6688b9b8fd82ea4a5cf4674dabad79.zip | |
PCI: restore saved SR-IOV state
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/iov.c | 29 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 1 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 4 |
3 files changed, 34 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 66cc414ed15f..b121e47402fa 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -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); +} diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 2b3201ec2b05..676bbcbc272b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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; } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 7d5327c986f5..fd5ea4d445e8 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -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 */ |