iommu/amd: Have amd_iommu_domain_flush_pages() use last

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Finish clearing out the size/last/end switching by converting
amd_iommu_domain_flush_pages() to use last-based logic.

This algorithm is simpler than the previous. Ultimately all this wants
to do is select powers of two that are aligned to address and not
longer than the distance to last.

The new version is fully safe for size = U64_MAX and last = U64_MAX.

Finally, the gather can be passed through natively without risking an
overflow in (gather->end - gather->start + 1).

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Wei Wang <wei.w.wang@hotmail.com>
Tested-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Jason Gunthorpe 2026-03-27 12:23:57 -03:00 • committed by Joerg Roedel

parent 2e43a291d7

commit cc08ecaf8e

2 changed files with 16 additions and 29 deletions

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drivers/iommu/amd/amd_iommu.h

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43

drivers/iommu/amd/iommu.c

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