drm/msm: Add PRR support

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Add PRR (Partial Resident Region) is a bypass address which make GPU
writes go to /dev/null and reads return zero.  This is used to implement
vulkan sparse residency.

To support PRR/NULL mappings, we allocate a page to reserve a physical
address which we know will not be used as part of a GEM object, and
configure the SMMU to use this address for PRR/NULL mappings.

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/661486/

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Rob Clark 2025-06-29 13:13:01 -07:00 • committed by Rob Clark

parent 2c7ad99255

commit dbbde63c9e

3 changed files with 73 additions and 1 deletions

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10

drivers/gpu/drm/msm/adreno/adreno_gpu.c

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62

drivers/gpu/drm/msm/msm_iommu.c

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2

include/uapi/drm/msm_drm.h

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