[PATCH] pci: quirks: Add ACS quirk for Solarflare SFC9120 & SFC9140

[Alex Williamson]

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 <***@redhat.com>
Cc: Robert Stonehouse <***@solarflare.com>
---

drivers/pci/quirks.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 80c2d01..78cc83f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3664,6 +3664,21 @@ 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;
@@ -3675,6 +3690,8 @@ 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 }
};

[Robert Stonehouse]

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

Acked-by: Robert Stonehouse <***@solarflare.com>

[Bjorn Helgaas]

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

Applied with Robert's ack to pci/virtualization for v3.18, thanks!

Post by Alex Williamson
---
drivers/pci/quirks.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 80c2d01..78cc83f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3664,6 +3664,21 @@ 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;
@@ -3675,6 +3690,8 @@ 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 }
};