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| author | Rob Clark <robdclark@chromium.org> | 2025-06-29 13:13:01 -0700 |
|---|---|---|
| committer | Rob Clark <robin.clark@oss.qualcomm.com> | 2025-07-04 17:48:35 -0700 |
| commit | dbbde63c9e9d472743a88f975baac412ba93f29d (patch) | |
| tree | 6f79b6693e7a8d306dc3443315a55823d6f9bc3b /include | |
| parent | drm/msm: Add mmu support for non-zero offset (diff) | |
| download | linux-dbbde63c9e9d472743a88f975baac412ba93f29d.tar.gz linux-dbbde63c9e9d472743a88f975baac412ba93f29d.zip | |
drm/msm: Add PRR support
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/
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/drm/msm_drm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h index 2342cb90857e..5bc5e4526ccf 100644 --- a/include/uapi/drm/msm_drm.h +++ b/include/uapi/drm/msm_drm.h @@ -91,6 +91,8 @@ struct drm_msm_timespec { #define MSM_PARAM_UBWC_SWIZZLE 0x12 /* RO */ #define MSM_PARAM_MACROTILE_MODE 0x13 /* RO */ #define MSM_PARAM_UCHE_TRAP_BASE 0x14 /* RO */ +/* PRR (Partially Resident Region) is required for sparse residency: */ +#define MSM_PARAM_HAS_PRR 0x15 /* RO */ /* For backwards compat. The original support for preemption was based on * a single ring per priority level so # of priority levels equals the # |