amd/scheduler:imple job skip feature(v3)

jobs are skipped under two cases
1)when the entity behind this job marked guilty, the job
poped from this entity's queue will be dropped in sched_main loop.

2)in job_recovery(), skip the scheduling job if its karma detected
above limit, and also skipped as well for other jobs sharing the
same fence context. this approach is becuase job_recovery() cannot
access job->entity due to entity may already dead.

v2:
some logic fix

v3:
when entity detected guilty, don't drop the job in the poping
stage, instead set its fence error as -ECANCELED

in run_job(), skip the scheduling either:1) fence->error < 0
or 2) there was a VRAM LOST occurred on this job.
this way we can unify the job skipping logic.

with this feature we can introduce new gpu recover feature.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 31 insertions, 21 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index f60662e03761..0a90c768dbc1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -180,7 +180,7 @@ static struct dma_fence *amdgpu_job_dependency(struct amd_sched_job *sched_job,
 
 static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job)
 {
-        struct dma_fence *fence = NULL;
+        struct dma_fence *fence = NULL, *finished;
         struct amdgpu_device *adev;
         struct amdgpu_job *job;
         int r;
@@ -190,15 +190,18 @@ static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job)
                 return NULL;
         }
         job = to_amdgpu_job(sched_job);
+        finished = &job->base.s_fence->finished;
         adev = job->adev;
 
         BUG_ON(amdgpu_sync_peek_fence(&job->sync, NULL));
 
         trace_amdgpu_sched_run_job(job);
-        /* skip ib schedule when vram is lost */
-        if (job->vram_lost_counter != atomic_read(&adev->vram_lost_counter)) {
-                dma_fence_set_error(&job->base.s_fence->finished, -ECANCELED);
-                DRM_ERROR("Skip scheduling IBs!\n");
+
+        if (job->vram_lost_counter != atomic_read(&adev->vram_lost_counter))
+                dma_fence_set_error(finished, -ECANCELED);/* skip IB as well if VRAM lost */
+
+        if (finished->error < 0) {
+                DRM_INFO("Skip scheduling IBs!\n");
         } else {
                 r = amdgpu_ib_schedule(job->ring, job->num_ibs, job->ibs, job,
                                        &fence);
diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
index f116de798204..941b5920b97b 100644
--- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
+++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
@@ -345,6 +345,10 @@ amd_sched_entity_pop_job(struct amd_sched_entity *entity)
                 if (amd_sched_entity_add_dependency_cb(entity))
                         return NULL;
 
+        /* skip jobs from entity that marked guilty */
+        if (entity->guilty && atomic_read(entity->guilty))
+                dma_fence_set_error(&sched_job->s_fence->finished, -ECANCELED);
+
         spsc_queue_pop(&entity->job_queue);
         return sched_job;
 }
@@ -441,14 +445,6 @@ static void amd_sched_job_timedout(struct work_struct *work)
         job->sched->ops->timedout_job(job);
 }
 
-static void amd_sched_set_guilty(struct amd_sched_job *s_job,
-                                 struct amd_sched_entity *s_entity)
-{
-        if (atomic_inc_return(&s_job->karma) > s_job->sched->hang_limit)
-                if (s_entity->guilty)
-                        atomic_set(s_entity->guilty, 1);
-}
-
 void amd_sched_hw_job_reset(struct amd_gpu_scheduler *sched, struct amd_sched_job *bad)
 {
         struct amd_sched_job *s_job;
@@ -468,21 +464,24 @@ void amd_sched_hw_job_reset(struct amd_gpu_scheduler *sched, struct amd_sched_jo
         spin_unlock(&sched->job_list_lock);
 
         if (bad) {
-                bool found = false;
-
-                for (i = AMD_SCHED_PRIORITY_MIN; i < AMD_SCHED_PRIORITY_MAX; i++ ) {
+                /* don't increase @bad's karma if it's from KERNEL RQ,
+                 * becuase sometimes GPU hang would cause kernel jobs (like VM updating jobs)
+                 * corrupt but keep in mind that kernel jobs always considered good.
+                 */
+                for (i = AMD_SCHED_PRIORITY_MIN; i < AMD_SCHED_PRIORITY_KERNEL; i++ ) {
                         struct amd_sched_rq *rq = &sched->sched_rq[i];
 
                         spin_lock(&rq->lock);
                         list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
                                 if (bad->s_fence->scheduled.context == entity->fence_context) {
-                                        found = true;
-                                        amd_sched_set_guilty(bad, entity);
+                                    if (atomic_inc_return(&bad->karma) > bad->sched->hang_limit)
+                                                if (entity->guilty)
+                                                        atomic_set(entity->guilty, 1);
                                         break;
                                 }
                         }
                         spin_unlock(&rq->lock);
-                        if (found)
+                        if (&entity->list != &rq->entities)
                                 break;
                 }
         }
@@ -500,6 +499,7 @@ void amd_sched_job_kickout(struct amd_sched_job *s_job)
 void amd_sched_job_recovery(struct amd_gpu_scheduler *sched)
 {
         struct amd_sched_job *s_job, *tmp;
+        bool found_guilty = false;
         int r;
 
         spin_lock(&sched->job_list_lock);
@@ -511,6 +511,15 @@ void amd_sched_job_recovery(struct amd_gpu_scheduler *sched)
         list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
                 struct amd_sched_fence *s_fence = s_job->s_fence;
                 struct dma_fence *fence;
+                uint64_t guilty_context;
+
+                if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
+                        found_guilty = true;
+                        guilty_context = s_job->s_fence->scheduled.context;
+                }
+
+                if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
+                        dma_fence_set_error(&s_fence->finished, -ECANCELED);
 
                 spin_unlock(&sched->job_list_lock);
                 fence = sched->ops->run_job(s_job);
@@ -526,7 +535,6 @@ void amd_sched_job_recovery(struct amd_gpu_scheduler *sched)
                                           r);
                         dma_fence_put(fence);
                 } else {
-                        DRM_ERROR("Failed to run job!\n");
                         amd_sched_process_job(NULL, &s_fence->cb);
                 }
                 spin_lock(&sched->job_list_lock);
@@ -664,7 +672,6 @@ static int amd_sched_main(void *param)
                                           r);
                         dma_fence_put(fence);
                 } else {
-                        DRM_ERROR("Failed to run job!\n");
                         amd_sched_process_job(NULL, &s_fence->cb);
                 }