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PCI: Add device-specific PCI ACS enable

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Some devices support PCI ACS-like features, but don't report it using the
standard PCIe capabilities.  We already provide hooks for device-specific
testing of ACS, but not for device-specific enabling of ACS.  This provides
that setup hook.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Alex Williamson
2014-02-03 14:27:33 -07:00
committed by Bjorn Helgaas
parent 38dbfb59d1
commit 2c74424470
3 changed files with 47 additions and 6 deletions
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25
drivers/pci/quirks.c
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@@ -3461,3 +3461,28 @@ int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags)
return -ENOTTY;
}
static const struct pci_dev_enable_acs {
u16 vendor;
u16 device;
int (*enable_acs)(struct pci_dev *dev);
} pci_dev_enable_acs[] = {
{ 0 }
};
void pci_dev_specific_enable_acs(struct pci_dev *dev)
{
const struct pci_dev_enable_acs *i;
int ret;
for (i = pci_dev_enable_acs; i->enable_acs; i++) {
if ((i->vendor == dev->vendor ||
i->vendor == (u16)PCI_ANY_ID) &&
(i->device == dev->device ||
i->device == (u16)PCI_ANY_ID)) {
ret = i->enable_acs(dev);
if (ret >= 0)
return;
}
}
}