PCI: Add DMA alias quirk for mic_x200_dma

The MIC x200 NTB forwards DMA transactions upstream using multiple alien
RIDs.  These RIDs have to be added as aliases to the DMA device to allow
buffer access when the IOMMU is enabled.

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 7559e4024447980f1c2117e8cc5a1503f63bc1be..8889ac433cf141ca4e032a107b5c86f661e2b3b0 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3724,6 +3724,21 @@ DECLARE_PCI_FIXUP_HEADER(0x1283, 0x8892, quirk_use_pcie_bridge_dma_alias);
 /* Intel 82801, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c49 */
 DECLARE_PCI_FIXUP_HEADER(0x8086, 0x244e, quirk_use_pcie_bridge_dma_alias);
 
+/*
+ * MIC x200 NTB forwards PCIe traffic using multiple alien RIDs. They have to
+ * be added as aliases to the DMA device in order to allow buffer access
+ * when IOMMU is enabled. Following devfns have to match RIT-LUT table
+ * programmed in the EEPROM.
+ */
+static void quirk_mic_x200_dma_alias(struct pci_dev *pdev)
+{
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x10, 0x0));
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x11, 0x0));
+       pci_add_dma_alias(pdev, PCI_DEVFN(0x12, 0x3));
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2260, quirk_mic_x200_dma_alias);
+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.