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PCI: Add device-specific ACS Redirect disable infrastructure

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Intel Sunrise Point (SPT) PCH hardware has an implementation of the ACS
bits that does not comply with the PCIe standard.  To deal with this we
need device-specific quirks to disable ACS redirection.

Add a new pci_dev_specific_disable_acs_redir() quirk and a new
.disable_acs_redir() function pointer for use by non-compliant devices.  No
functional change intended.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
[bhelgaas: split to separate patch, move
pci_dev_specific_disable_acs_redir() declarations to drivers/pci/pci.h]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Logan Gunthorpe
2018-08-09 16:51:43 -05:00
committed by Bjorn Helgaas
parent 3b269185c1
commit 73c47ddef2
3 changed files with 43 additions and 8 deletions
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3
drivers/pci/pci.c
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@@ -3023,6 +3023,9 @@ static void pci_disable_acs_redir(struct pci_dev *dev)
if (ret != 1)
return;
if (!pci_dev_specific_disable_acs_redir(dev))
return;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
if (!pos) {
pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");