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| author | Dexuan Cui <dexuan.cui@intel.com> | 2009-12-07 13:03:21 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-12-16 13:37:50 -0800 |
| commit | b9c3b266411d27f1a6466c19d146d08db576bfea (patch) | |
| tree | c310b37e7dff6607e22eca0b690c2a3f290c85a9 /drivers/pci | |
| parent | 2820f333e3b4ad96590093efbed7b3400bcf492b (diff) | |
| download | kernel_samsung_smdk4412-b9c3b266411d27f1a6466c19d146d08db576bfea.zip kernel_samsung_smdk4412-b9c3b266411d27f1a6466c19d146d08db576bfea.tar.gz kernel_samsung_smdk4412-b9c3b266411d27f1a6466c19d146d08db576bfea.tar.bz2 | |
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 <yu.zhao@intel.com>
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 19 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 8 | ||||
| -rw-r--r-- | drivers/pci/quirks.c | 9 |
3 files changed, 36 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 0bc27e0..6011d06 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 33ed8e0..709eaa4 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 f70f4e2..86c9177 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 |