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[for 26.04_linux-nvidia-bos]: NVIDIA: SAUCE: iommu/arm-smmu-v3: Use identity domain for ASPEED BMC devices #392

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[for 26.04_linux-nvidia-bos]: NVIDIA: SAUCE: iommu/arm-smmu-v3: Use identity domain for ASPEED BMC devices #392

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13 changes: 13 additions & 0 deletions drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3784,6 +3784,19 @@ static int arm_smmu_def_domain_type(struct device *dev)
if (IS_HISI_PTT_DEVICE(pdev))
return IOMMU_DOMAIN_IDENTITY;

/*
* ASPEED BMC devices behind an AST1150 PCIe-to-PCI bridge
* receive DMA from BMC firmware using host physical addresses
* that bypass the kernel DMA API. Use identity mapping so
* the SMMU passes these transactions through untranslated.
*/
if (pdev->bus->self &&
(pdev->bus->self->dev_flags &
PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIAS) &&
pdev->bus->self->vendor == PCI_VENDOR_ID_ASPEED &&
pdev->bus->self->device == 0x1150)
return IOMMU_DOMAIN_IDENTITY;

if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
(pdev->device == 0x2E12 || pdev->device == 0x2E2A ||
pdev->device == 0x2E2B))
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