diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 66 |
1 files changed, 40 insertions, 26 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 061d1ee0046..62978f644a9 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1751,24 +1751,7 @@ int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask) EXPORT_SYMBOL(pci_set_dma_seg_boundary); #endif -/** - * pci_execute_reset_function() - Reset a PCI device function - * @dev: Device function to reset - * - * Some devices allow an individual function to be reset without affecting - * other functions in the same device. The PCI device must be responsive - * to PCI config space in order to use this function. - * - * The device function is presumed to be unused when this function is called. - * Resetting the device will make the contents of PCI configuration space - * random, so any caller of this must be prepared to reinitialise the - * device including MSI, bus mastering, BARs, decoding IO and memory spaces, - * etc. - * - * Returns 0 if the device function was successfully reset or -ENOTTY if the - * device doesn't support resetting a single function. - */ -int pci_execute_reset_function(struct pci_dev *dev) +static int __pcie_flr(struct pci_dev *dev, int probe) { u16 status; u32 cap; @@ -1780,6 +1763,9 @@ int pci_execute_reset_function(struct pci_dev *dev) if (!(cap & PCI_EXP_DEVCAP_FLR)) return -ENOTTY; + if (probe) + return 0; + pci_block_user_cfg_access(dev); /* Wait for Transaction Pending bit clean */ @@ -1802,6 +1788,39 @@ int pci_execute_reset_function(struct pci_dev *dev) pci_unblock_user_cfg_access(dev); return 0; } + +static int __pci_reset_function(struct pci_dev *pdev, int probe) +{ + int res; + + res = __pcie_flr(pdev, probe); + if (res != -ENOTTY) + return res; + + return res; +} + +/** + * pci_execute_reset_function() - Reset a PCI device function + * @dev: Device function to reset + * + * Some devices allow an individual function to be reset without affecting + * other functions in the same device. The PCI device must be responsive + * to PCI config space in order to use this function. + * + * The device function is presumed to be unused when this function is called. + * Resetting the device will make the contents of PCI configuration space + * random, so any caller of this must be prepared to reinitialise the + * device including MSI, bus mastering, BARs, decoding IO and memory spaces, + * etc. + * + * Returns 0 if the device function was successfully reset or -ENOTTY if the + * device doesn't support resetting a single function. + */ +int pci_execute_reset_function(struct pci_dev *dev) +{ + return __pci_reset_function(dev, 0); +} EXPORT_SYMBOL_GPL(pci_execute_reset_function); /** @@ -1822,15 +1841,10 @@ EXPORT_SYMBOL_GPL(pci_execute_reset_function); */ int pci_reset_function(struct pci_dev *dev) { - u32 cap; - int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP); - int r; + int r = __pci_reset_function(dev, 1); - if (!exppos) - return -ENOTTY; - pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap); - if (!(cap & PCI_EXP_DEVCAP_FLR)) - return -ENOTTY; + if (r < 0) + return r; if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0) disable_irq(dev->irq); |