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| author | Philipp Stanner <phasta@kernel.org> | 2025-11-07 16:57:00 +0300 |
|---|---|---|
| committer | Philipp Stanner <phasta@kernel.org> | 2025-12-02 12:40:37 +0300 |
| commit | 9d56cbaf12037e8ce7ead9f8f8f9000e4784f2eb (patch) | |
| tree | aa6b205443b83bc74b3cbb2720afb5c28b4fca34 | |
| parent | 7068d42048dab5eb71a0d65388f64f1e0ca5b9ee (diff) | |
| download | linux-9d56cbaf12037e8ce7ead9f8f8f9000e4784f2eb.tar.xz | |
drm/todo: Add section with task for GPU scheduler
The GPU scheduler has a great many problems and deserves its own TODO
section.
Add a section and a first task describing the problem of
drm_sched_resubmit_jobs() being deprecated without a successor.
Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251107135701.244659-3-phasta@kernel.org
| -rw-r--r-- | Documentation/gpu/todo.rst | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 9013ced318cb..572a5611dd0c 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -878,6 +878,37 @@ Contact: Christian König Level: Starter +DRM GPU Scheduler +================= + +Provide a universal successor for drm_sched_resubmit_jobs() +----------------------------------------------------------- + +drm_sched_resubmit_jobs() is deprecated. Main reason being that it leads to +reinitializing dma_fences. See that function's docu for details. The better +approach for valid resubmissions by amdgpu and Xe is (apparently) to figure out +which job (and, through association: which entity) caused the hang. Then, the +job's buffer data, together with all other jobs' buffer data currently in the +same hardware ring, must be invalidated. This can for example be done by +overwriting it. amdgpu currently determines which jobs are in the ring and need +to be overwritten by keeping copies of the job. Xe obtains that information by +directly accessing drm_sched's pending_list. + +Tasks: + +1. implement scheduler functionality through which the driver can obtain the + information which *broken* jobs are currently in the hardware ring. +2. Such infrastructure would then typically be used in + drm_sched_backend_ops.timedout_job(). Document that. +3. Port a driver as first user. +4. Document the new alternative in the docu of deprecated + drm_sched_resubmit_jobs(). + +Contact: Christian König <christian.koenig@amd.com> + Philipp Stanner <phasta@kernel.org> + +Level: Advanced + Outside DRM =========== |