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PCI: support device-specific reset methods

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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>
This commit is contained in:
Dexuan Cui 2009-12-07 13:03:21 +08:00 committed by Jesse Barnes
parent 2820f333e3
commit b9c3b26641
3 changed files with 36 additions and 0 deletions
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19
drivers/pci/pci.c
View File

@ -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;

8
drivers/pci/pci.h
View File

@ -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 */

9
drivers/pci/quirks.c
View File

@ -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