drm/msm: Support pgtable preallocation

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Introduce a mechanism to count the worst case # of pages required in a
VM_BIND op.

Note that previously we would have had to somehow account for
allocations in unmap, when splitting a block.  This behavior was removed
in commit 33729a5fc0 ("iommu/io-pgtable-arm: Remove split on unmap
behavior)"

Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Tested-by: Antonino Maniscalco <antomani103@gmail.com>
Reviewed-by: Antonino Maniscalco <antomani103@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/661515/

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Rob Clark 2025-06-29 13:13:16 -07:00 • committed by Rob Clark

parent 2b93efeb83

commit e601ea31d6

3 changed files with 225 additions and 1 deletions

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1

drivers/gpu/drm/msm/msm_gem.h

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191

drivers/gpu/drm/msm/msm_iommu.c

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34

drivers/gpu/drm/msm/msm_mmu.h

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