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WORKAROUND: iommu/arm-smmu: Work around Qualcomm SMMU-500 TLBIVAL granule issue - #156
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Tingwei Zhang (quic-tingweiz) merged 2 commits intoOct 13, 2026
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…nule issue Qualcomm SMMU-500 has an issue with TLBIVA/TLBIVAL where only the base-page-size entry at the base IOVA is invalidated, leaving stale TLB entries for the rest of the range. This causes use-after-free: after dma_free_coherent() unmaps a large buffer, the device can still access freed physical memory through stale TLB entries. On FastRPC workloads this manifests as ADSP crashes when the ELF loader writes to a freed PA that has been reallocated. Force the TLB invalidation step granule to the minimum page size for all Qualcomm SMMU-500 domains, ensuring each page in the range is individually invalidated. The minimum page size from pgsize_bitmap is used rather than hardcoded 4K to correctly handle 16K and 64K granule configurations. This increases the number of TLB invalidation operations for large ranges, but correctness takes precedence. Signed-off-by: Prakash Gupta <prakash.gupta@oss.qualcomm.com> Signed-off-by: Sibi Sankar <sibi.sankar@oss.qualcomm.com> (cherry picked from commit 219d869a96c8fb79ab6c6604eaf61b0656c135ec)
…0100 Add qcom,x1e80100-smmu-500 to the force_min_tlbival_granule check so that Hamoa and Purwa apps_smmu are also covered. Signed-off-by: Yushan Li <yushan.li@oss.qualcomm.com>
Tingwei Zhang (quic-tingweiz)
approved these changes
Oct 13, 2026
Tingwei Zhang (quic-tingweiz)
merged commit Oct 13, 2026
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qualcomm-linux:resolute-qcom-devel
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Work around Qualcomm SMMU-500 TLBIVAL granule issue on Glymur, Hamoa and Purwa.