From: Luben Tuikov <ltuikov89@xxxxxxxxx> Reverse run-queue priority enumeration such that the higest priority is now 0, and for each consecutive integer the prioirty diminishes. Run-queues correspond to priorities. To an external observer a scheduler created with a single run-queue, and another created with DRM_SCHED_PRIORITY_COUNT number of run-queues, should always schedule sched->sched_rq[0] with the same "priority", as that index run-queue exists in both schedulers, i.e. a scheduler with one run-queue or many. This patch makes it so. In other words, the "priority" of sched->sched_rq[n], n >= 0, is the same for any scheduler created with any allowable number of run-queues (priorities), 0 to DRM_SCHED_PRIORITY_COUNT. Cc: Rob Clark <robdclark@xxxxxxxxx> Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Cc: Danilo Krummrich <dakr@xxxxxxxxxx> Cc: Alex Deucher <alexander.deucher@xxxxxxx> Cc: Christian König <christian.koenig@xxxxxxx> Cc: linux-arm-msm@xxxxxxxxxxxxxxx Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Signed-off-by: Luben Tuikov <ltuikov89@xxxxxxxxx> Reviewed-by: Christian König <christian.koenig@xxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20231124052752.6915-6-ltuikov89@xxxxxxxxx (cherry picked from commit 38f922a563aac3148ac73e73689805917f034cb5) --- drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 2 +- drivers/gpu/drm/msm/msm_gpu.h | 2 +- drivers/gpu/drm/scheduler/sched_entity.c | 5 +++-- drivers/gpu/drm/scheduler/sched_main.c | 15 +++++++-------- include/drm/gpu_scheduler.h | 6 +++--- 5 files changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c index 1a25931607c5..71a5cf37b472 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c @@ -325,7 +325,7 @@ void amdgpu_job_stop_all_jobs_on_sched(struct drm_gpu_scheduler *sched) int i; /* Signal all jobs not yet scheduled */ - for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_LOW; i--) { + for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) { struct drm_sched_rq *rq = sched->sched_rq[i]; spin_lock(&rq->lock); list_for_each_entry(s_entity, &rq->entities, list) { diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index eb0c97433e5f..2bfcb222e353 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -347,7 +347,7 @@ struct msm_gpu_perfcntr { * DRM_SCHED_PRIORITY_KERNEL priority level is treated specially in some * cases, so we don't use it (no need for kernel generated jobs). */ -#define NR_SCHED_PRIORITIES (1 + DRM_SCHED_PRIORITY_HIGH - DRM_SCHED_PRIORITY_LOW) +#define NR_SCHED_PRIORITIES (1 + DRM_SCHED_PRIORITY_LOW - DRM_SCHED_PRIORITY_HIGH) /** * struct msm_file_private - per-drm_file context diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index dd2b8f777f51..3c4f5a392b06 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -82,13 +82,14 @@ int drm_sched_entity_init(struct drm_sched_entity *entity, pr_warn("%s: called with uninitialized scheduler\n", __func__); } else if (num_sched_list) { /* The "priority" of an entity cannot exceed the number of run-queues of a - * scheduler. Protect against num_rqs being 0, by converting to signed. + * scheduler. Protect against num_rqs being 0, by converting to signed. Choose + * the lowest priority available. */ if (entity->priority >= sched_list[0]->num_rqs) { drm_err(sched_list[0], "entity with out-of-bounds priority:%u num_rqs:%u\n", entity->priority, sched_list[0]->num_rqs); entity->priority = max_t(s32, (s32) sched_list[0]->num_rqs - 1, - (s32) DRM_SCHED_PRIORITY_LOW); + (s32) DRM_SCHED_PRIORITY_KERNEL); } entity->rq = sched_list[0]->sched_rq[entity->priority]; } diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c index b6d7bc49ff6e..682aebe96db7 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -1051,8 +1051,9 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched) struct drm_sched_entity *entity; int i; - /* Kernel run queue has higher priority than normal run queue*/ - for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_LOW; i--) { + /* Start with the highest priority. + */ + for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) { entity = drm_sched_policy == DRM_SCHED_POLICY_FIFO ? drm_sched_rq_select_entity_fifo(sched, sched->sched_rq[i]) : drm_sched_rq_select_entity_rr(sched, sched->sched_rq[i]); @@ -1291,7 +1292,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched, if (!sched->sched_rq) goto Out_free; sched->num_rqs = num_rqs; - for (i = DRM_SCHED_PRIORITY_LOW; i < sched->num_rqs; i++) { + for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) { sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]), GFP_KERNEL); if (!sched->sched_rq[i]) goto Out_unroll; @@ -1312,7 +1313,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched, sched->ready = true; return 0; Out_unroll: - for (--i ; i >= DRM_SCHED_PRIORITY_LOW; i--) + for (--i ; i >= DRM_SCHED_PRIORITY_KERNEL; i--) kfree(sched->sched_rq[i]); Out_free: kfree(sched->sched_rq); @@ -1338,7 +1339,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched) drm_sched_wqueue_stop(sched); - for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_LOW; i--) { + for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) { struct drm_sched_rq *rq = sched->sched_rq[i]; spin_lock(&rq->lock); @@ -1390,9 +1391,7 @@ void drm_sched_increase_karma(struct drm_sched_job *bad) if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) { atomic_inc(&bad->karma); - for (i = DRM_SCHED_PRIORITY_LOW; - i < min_t(typeof(sched->num_rqs), sched->num_rqs, DRM_SCHED_PRIORITY_KERNEL); - i++) { + for (i = DRM_SCHED_PRIORITY_HIGH; i < sched->num_rqs; i++) { struct drm_sched_rq *rq = sched->sched_rq[i]; spin_lock(&rq->lock); diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index d8e2d84d9223..5acc64954a88 100644 --- a/include/drm/gpu_scheduler.h +++ b/include/drm/gpu_scheduler.h @@ -63,10 +63,10 @@ struct drm_file; * to an array, and as such should start at 0. */ enum drm_sched_priority { - DRM_SCHED_PRIORITY_LOW, - DRM_SCHED_PRIORITY_NORMAL, - DRM_SCHED_PRIORITY_HIGH, DRM_SCHED_PRIORITY_KERNEL, + DRM_SCHED_PRIORITY_HIGH, + DRM_SCHED_PRIORITY_NORMAL, + DRM_SCHED_PRIORITY_LOW, DRM_SCHED_PRIORITY_COUNT }; -- 2.43.0
