From: Dexuan Cui Date: Mon, 7 Dec 2009 05:03:21 +0000 (+0800) Subject: PCI: support device-specific reset methods X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b9c3b266411d27f1a6466c19d146d08db576bfea;p=mv-sheeva.git PCI: support device-specific reset methods Add a new type of quirk for resetting devices at pci_dev_reset time. This is necessary to handle device with nonstandard reset procedures, especially useful for guest drivers. Signed-off-by: Yu Zhao Signed-off-by: Dexuan Cui Signed-off-by: Jesse Barnes --- diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 0bc27e05901..6011d064e89 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2284,6 +2284,21 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) return 0; } +static int pci_dev_specific_reset(struct pci_dev *dev, int probe) +{ + struct pci_dev_reset_methods *i; + + for (i = pci_dev_reset_methods; i->reset; i++) { + if ((i->vendor == dev->vendor || + i->vendor == (u16)PCI_ANY_ID) && + (i->device == dev->device || + i->device == (u16)PCI_ANY_ID)) + return i->reset(dev, probe); + } + + return -ENOTTY; +} + static int pci_dev_reset(struct pci_dev *dev, int probe) { int rc; @@ -2296,6 +2311,10 @@ static int pci_dev_reset(struct pci_dev *dev, int probe) down(&dev->dev.sem); } + rc = pci_dev_specific_reset(dev, probe); + if (rc != -ENOTTY) + goto done; + rc = pcie_flr(dev, probe); if (rc != -ENOTTY) goto done; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 33ed8e0aba1..709eaa4fee5 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -313,4 +313,12 @@ static inline int pci_resource_alignment(struct pci_dev *dev, extern void pci_enable_acs(struct pci_dev *dev); +struct pci_dev_reset_methods { + u16 vendor; + u16 device; + int (*reset)(struct pci_dev *dev, int probe); +}; + +extern struct pci_dev_reset_methods pci_dev_reset_methods[]; + #endif /* DRIVERS_PCI_H */ diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index f70f4e23225..86c9177a6c6 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2636,6 +2636,15 @@ static int __init pci_apply_final_quirks(void) } fs_initcall_sync(pci_apply_final_quirks); + +/* + * Followings are device-specific reset methods which can be used to + * reset a single function if other methods (e.g. FLR, PM D0->D3) are + * not available. + */ +struct pci_dev_reset_methods pci_dev_reset_methods[] = { + { 0 } +}; #else void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev) {} #endif