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[v2,2/2] pci: Add DMA alias quirk for mic_x200_dma

Message ID 1453829067-128959-1-git-send-email-jacek.lawrynowicz@intel.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Jacek Lawrynowicz Jan. 26, 2016, 5:24 p.m. UTC 
MIC x200 NTB forwards PCIe traffic using multiple alien RID. They have to
be added as aliases to the DMA device in order to allow buffer access
when IOMMU is enabled.

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@intel.com>
Acked-By: David Woodhouse <David.Woodhouse@intel.com>
---
 drivers/pci/quirks.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 83c3da1..350eac3 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3702,6 +3702,19 @@  DECLARE_PCI_FIXUP_HEADER(0x1283, 0x8892, quirk_use_pcie_bridge_dma_alias);
 DECLARE_PCI_FIXUP_HEADER(0x8086, 0x244e, quirk_use_pcie_bridge_dma_alias);
 
 /*
+ * MIC x200 NTB forwards PCIe traffic using multiple alien RID. They have to
+ * be added as aliases to the DMA device in order to allow buffer access
+ * when IOMMU is enabled.
+ */
+static void quirk_mic_x200_dma_alias(struct pci_dev *pdev)
+{
+	pci_enable_dma_alias(pdev, PCI_DEVFN(0x10, 0x0));
+	pci_enable_dma_alias(pdev, PCI_DEVFN(0x11, 0x0));
+	pci_enable_dma_alias(pdev, PCI_DEVFN(0x12, 0x3));
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2264, quirk_mic_x200_dma_alias);
+
+/*
  * Intersil/Techwell TW686[4589]-based video capture cards have an empty (zero)
  * class code.  Fix it.
  */