[for 26.04_linux-nvidia-bos]: NVIDIA: SAUCE: iommu/arm-smmu-v3: Use identity domain for ASPEED BMC devices#392
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PR Validation ReportPatchscan ✅ No Missing FixesAll cherry-picked commits checked — no missing upstream fixes found. PR Lint ✅ All checks passedDetailsChecking 1 commits... Cherry-pick digest: ┌──────────────┬───────────────────────────────────────────────┬────────────┬─────────┬───────────────────────────┐ │ Local │ Referenced upstream / Patch subject │ Patch-ID │ Subject │ SoB chain │ ├──────────────┼───────────────────────────────────────────────┼────────────┼─────────┼───────────────────────────┤ │ 8c2d38a54cc6 │ [SAUCE] iommu/arm-smmu-v3: use identity domai │ N/A │ N/A │ kobak, kobak │ └──────────────┴───────────────────────────────────────────────┴────────────┴─────────┴───────────────────────────┘ Lint: all checks passed. |
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If we're going to pick this from 6.17-HWE then I think we should wait for the the original patch to merged into 6.17. |
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Instead of Use |
…devices ASPEED BMC devices behind an AST1150 PCIe-to-PCI bridge receive DMA from BMC firmware using host physical addresses that bypass the kernel's DMA API entirely. When these devices are assigned a DMA translated domain, the SMMU generates F_TRANSLATION faults because the BMC's physical addresses have no corresponding IOVA mappings in the SMMU page tables. Fix this by returning IOMMU_DOMAIN_IDENTITY for PCI devices whose parent bridge has both the PCI_BRIDGE_NO_ALIASES flag and an ASPEED vendor ID, so the SMMU passes BMC DMA transactions through untranslated. Signed-off-by: Koba Ko <kobak@nvidia.com> (backported from commit 738fff0 linux-nvidia-6.17) [koba: rename PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIASES -> PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIAS; Nirmoy's upstream AST1150 NO_ALIAS quirk in 7.0 uses the singular form (bit 14 in include/linux/pci.h) vs the plural form (bit 15) in 6.17-next] Signed-off-by: Koba Ko <kobak@nvidia.com>
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thanks, done |
nvmochs
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Acked-by: Matthew R. Ochs <mochs@nvidia.com>
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Acked-by: Carol L Soto <csoto@nvidia.com>
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Merged, closing PR. |
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Backport of #371 to
26.04_linux-nvidia-bos(kernel 7.0).Companion to #371 (
24.04_linux-nvidia-6.17-next).BugLink: 5918716
Backport delta vs PR #371
Single rename in
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIASES→PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIASThe flag was renamed between 6.17 and 7.0 (
include/linux/pci.hdeclaresit as bit 14 in 7.0 vs bit 15 in 6.17). The AST1150 NO_ALIAS quirk
(
drivers/pci/quirks.c:quirk_aspeed_pci_bridge_no_alias) is alreadypresent on this branch, so the
dev_flagscheck fires correctly.Sanity build
builds cleanly;
arm_smmu_def_domain_typeis present in the resultingobject.
Verification carried over from PR #371
iommu.passthrough=1Verified on Vera by Koba Ko and Carol Soto on 2026-04-15.
LP: https://bugs.launchpad.net/ubuntu/+source/linux-nvidia/+bug/2150470