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Any time the > > underlying translation is changed these need to be invalidated. At boot > > time the IOTLB starts out empty and all cache tags are available for > > allocation. > > > > When a tag is taken out of the allocator the code assumes the IOTLB > > doesn't reference it, and immediately programs it into a STE/CD. If the > > cache is referencing the tag then it will have stale data and IOMMU will > > become incoherent. > > > > Thus, whenever an ASID/VMID is freed back to the allocator we need to know > > that the IOTLB doesn't have any references to it. The SVA code correctly > > had an invalidation here, but the paging code does not. > > Isn't that....bad? Ah, that needed some more work I forgot to do. The paging code hides the invalidation in the free_io_pgtable_ops() called during domain free which calls back to arm_smmu_tlb_inv_context(). free_io_pgtable_ops() is the only thing that calls io_pgtable_tlb_flush_all() and thus arm_smmu_tlb_inv_context(). So we should also delete arm_smmu_tlb_inv_context() and NULL ops.tlb_flush_all. Then arm_smmu_domain_free_id() consistently handles the final invalidation on all code paths instead of having it split up. 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