PCI: Add device-specific PCI ACS enable
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>
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 5cb726c..f681fb0 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3461,3 +3461,28 @@
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;
+ }
+ }
+}
