Re: [PATCH v2] drm/msm/iommu: optimize map/unmap

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On 8/23/2022 10:07 PM, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>

Using map_pages/unmap_pages cuts down on the # of pgtable walks needed
in the process of finding where to insert/remove an entry.  The end
result is ~5-10x faster than mapping a single page at a time.

v2: Rename iommu_pgsize(), drop obsolete comments, fix error handling
     in msm_iommu_pagetable_map()

Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
  drivers/gpu/drm/msm/msm_iommu.c | 101 +++++++++++++++++++++++++++-----
  1 file changed, 86 insertions(+), 15 deletions(-)

Reviewed-by: Sai Prakash Ranjan <quic_saipraka@xxxxxxxxxxx>

Thanks,
Sai




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