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PCI: Add ACS quirk for Ampere root ports 

The Ampere Computing PCIe root port does not support ACS at this point.
However, the hardware provides isolation and source validation through the
SMMU. The stream ID generated by the PCIe ports contain both the
bus/device/function number as well as the port ID in its 3 most significant
bits. Turn on ACS but disable all the peer-to-peer features.

APM is being rebranded to Ampere.  The Vendor and Device IDs change, but
the functionality stays the same.

Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
This commit is contained in:
Feng Kan 2018-02-20 19:19:27 -08:00 committed by Bjorn Helgaas
parent 204f4afa7a
commit 4ef76ad046
2 changed files with 10 additions and 0 deletions
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9
drivers/pci/quirks.c
View File

@ -4514,6 +4514,15 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, pci_quirk_cavium_acs },
/* APM X-Gene */
{ PCI_VENDOR_ID_AMCC, 0xE004, pci_quirk_xgene_acs },
/* Ampere Computing */
{ PCI_VENDOR_ID_AMPERE, 0xE005, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE006, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE007, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE008, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE009, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs },
{ PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs },
{ 0 }
};

1
include/linux/pci_ids.h
View File

@ -1333,6 +1333,7 @@
#define PCI_DEVICE_ID_IMS_TT3D 0x9135
#define PCI_VENDOR_ID_AMCC 0x10e8
#define PCI_VENDOR_ID_AMPERE 0x1def
#define PCI_VENDOR_ID_INTERG 0x10ea
#define PCI_DEVICE_ID_INTERG_1682 0x1682