On Tue, Oct 6, 2026 at 10:23 PM Karl Mehltretter <[email protected]> wrote: > > > By passing NULL for iotlb_gather, does this bypass the IOMMU driver's TLB > > gathering and flushing mechanism? > > Yes. On arm64 QEMU/SMMUv3, unmap_pages(..., NULL) returned 4096 after > device DMA populated the IOTLB, but the next DMA still reached the old > page. It faulted after an explicit IOTLB flush. > > Using iommu_unmap() invalidated the translation: > > return iommu_unmap(domain, iova, pgsize * pgcount); > > > It appears this replaces iommu_map_sgtable() with a call to __do_map(), > > but there is no declaration or definition of __do_map() available. > > > > [...] > > > > Similar to the mapping path, is __do_unmap() actually defined? > > Patch 3 defines both helpers. msm_iommu.o builds with all five patches.
Sashiko is kinda funny sometimes :-) BR, -R
