AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-16 19:36:44 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

PCI: Add ACS quirk for iProc PAXB

Browse Source 
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>
This commit is contained in:
Abhinav Ratna 2019-08-20 10:09:45 +05:30 committed by Bjorn Helgaas
parent e499081da1
commit 46b2c32df7
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/pci/quirks.c
View File

@ -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 }
};