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 <[email protected]> Acked-by: David Woodhouse <[email protected]> --- Updated quirk comment with requirement that aliases have to be matching values programmed in the EEPROM. The LUT table on x200 is static so there is no need to program it from the driver. drivers/pci/quirks.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 51927a5..e66f09d 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3696,6 +3696,20 @@ 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 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, 0x2264, quirk_mic_x200_dma_alias); + +/* * Intersil/Techwell TW686[4589]-based video capture cards have an empty (zero) * class code. Fix it. */ -- 1.8.3.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
