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| author |   Abhinav Ratna <abhinav.ratna@broadcom.com> | 2019-08-20 10:09:45 +0530 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2019-09-05 17:22:53 -0500 |
| commit | 46b2c32df7a462d0e64b68c513e5c4c1b2a399a7 (patch) | |
| tree | 671d9617ca0a7c660a7546a41b2275e185ade44d /drivers/pci | |
| parent | PCI: Force trailing new line to resource_alignment_param in sysfs (diff) | |
| download | linux-dev-46b2c32df7a462d0e64b68c513e5c4c1b2a399a7.tar.xz linux-dev-46b2c32df7a462d0e64b68c513e5c4c1b2a399a7.zip | |
PCI: Add ACS quirk for iProc PAXB
iProc PAXB Root Ports don't advertise an ACS capability, but they do not
allow peer-to-peer transactions between Root Ports. Add an ACS quirk so
each Root Port can be in a separate IOMMU group.
[bhelgaas: commit log, comment, use common implementation style]
Link: https://lore.kernel.org/r/1566275985-25670-1-git-send-email-srinath.mannam@broadcom.com
Signed-off-by: Abhinav Ratna <abhinav.ratna@broadcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/quirks.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 208aacf39329..2edbce35e8c5 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4466,6 +4466,19 @@ static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags) return acs_flags ? 0 : 1; } +static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags) +{ + /* + * iProc PAXB Root Ports don't advertise an ACS capability, but + * they do not allow peer-to-peer transactions between Root Ports. + * Allow each Root Port to be in a separate IOMMU group by masking + * SV/RR/CR/UF bits. + */ + acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); + + return acs_flags ? 0 : 1; +} + static const struct pci_dev_acs_enabled { u16 vendor; u16 device; @@ -4559,6 +4572,7 @@ static const struct pci_dev_acs_enabled { { 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 }, + { PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs }, { 0 } }; |