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PCI: Add ACS quirk for Solarflare SFC9120 & SFC9140

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Solarflare confirms that these devices do not allow peer-to-peer between
functions.  Quirk them to allow IOMMU grouping to expose this isolation.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Robert Stonehouse <rstonehouse@solarflare.com>
This commit is contained in:
Alex Williamson 2014-09-17 08:59:36 -06:00 committed by Bjorn Helgaas
parent 5d8f4c9fdd
commit 89b51cb5c3
1 changed files with 17 additions and 0 deletions
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17
drivers/pci/quirks.c
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@ -3615,6 +3615,21 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags)
return acs_flags & ~flags ? 0 : 1;
}
static int pci_quirk_solarflare_acs(struct pci_dev *dev, u16 acs_flags)
{
/*
* SV, TB, and UF are not relevant to multifunction endpoints.
*
* Solarflare indicates that peer-to-peer between functions is not
* possible, therefore RR, CR, and DT are not implemented. Mask
* these out as if they were clear in the ACS capabilities register.
*/
acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
return acs_flags ? 0 : 1;
}
static const struct pci_dev_acs_enabled {
u16 vendor;
u16 device;
@ -3626,6 +3641,8 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_ATI, 0x439d, pci_quirk_amd_sb_acs },
{ PCI_VENDOR_ID_ATI, 0x4384, pci_quirk_amd_sb_acs },
{ PCI_VENDOR_ID_ATI, 0x4399, pci_quirk_amd_sb_acs },
{ PCI_VENDOR_ID_SOLARFLARE, 0x0903, pci_quirk_solarflare_acs },
{ PCI_VENDOR_ID_SOLARFLARE, 0x0923, pci_quirk_solarflare_acs },
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
{ 0 }
};