[PATCH 2/9] amd/scheduler:imple job skip feature

Christian K├Ânig ckoenig.leichtzumerken at gmail.com
Thu Oct 26 07:06:11 UTC 2017


Am 25.10.2017 um 11:22 schrieb Monk Liu:
> 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.
>
> with this feature we can introduce new gpu recover feature.

Sorry for the delay, totally swamped once more at the moment.

>
> Change-Id: I268b1c752c94e6ecd4ea78c87eb226ea3f52908a
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_job.c       |  9 +++---
>   drivers/gpu/drm/amd/scheduler/gpu_scheduler.c | 46 +++++++++++++++++++--------
>   drivers/gpu/drm/amd/scheduler/gpu_scheduler.h |  2 +-
>   3 files changed, 39 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> index a58e3c5..f08fde9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> @@ -177,7 +177,7 @@ static struct dma_fence *amdgpu_job_dependency(struct amd_sched_job *sched_job)
>   	return fence;
>   }
>   
> -static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job)
> +static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job, bool skip)
>   {
>   	struct dma_fence *fence = NULL;
>   	struct amdgpu_device *adev;
> @@ -194,10 +194,11 @@ static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job)
>   	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)) {
> +
> +	if (skip || job->vram_lost_counter != atomic_read(&adev->vram_lost_counter)) {
> +		/* skip ib schedule if looks needed, and set error */
>   		dma_fence_set_error(&job->base.s_fence->finished, -ECANCELED);
> -		DRM_ERROR("Skip scheduling IBs!\n");
> +		DRM_INFO("Skip scheduling IBs!\n");

Not really needed, we could just use amd_sched_job_fake_signal() here as 
well.

>   	} 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 9cbeade..29841ba 100644
> --- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
> +++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
> @@ -330,6 +330,20 @@ static bool amd_sched_entity_add_dependency_cb(struct amd_sched_entity *entity)
>   	return false;
>   }
>   
> +static void amd_sched_job_fake_signal(struct amd_sched_job *job)
> +{
> +	struct amd_sched_fence *s_fence = job->s_fence;
> +
> +	dma_fence_set_error(&job->s_fence->finished, -ECANCELED);
> +	/* fake signaling the scheduled fence */
> +	amd_sched_fence_scheduled(s_fence);
> +	/* fake signaling the finished fence */
> +	dma_fence_put(&job->s_fence->finished);
> +	job->sched->ops->free_job(job);

Well signaling the finished fence will free the job as well, won't it?

> +	/* call CB on the s_fence, e.g. wake up WAIT_CS */
> +	amd_sched_fence_finished(s_fence);
> +}
> +
>   static struct amd_sched_job *
>   amd_sched_entity_pop_job(struct amd_sched_entity *entity)
>   {
> @@ -345,6 +359,12 @@ amd_sched_entity_pop_job(struct amd_sched_entity *entity)
>   			return NULL;
>   
>   	sched_job->s_entity = NULL;
> +
> +	if (entity->guilty && atomic_read(entity->guilty)) {
> +		amd_sched_job_fake_signal(sched_job);
> +		sched_job = NULL;
> +	}
> +

This must come after the spsc_queue_pop() below, otherwise you mess up 
the spsc queue.

>   	spsc_queue_pop(&entity->job_queue);
>   	return sched_job;
>   }
> @@ -441,13 +461,6 @@ 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)
> -{
> -	if (atomic_inc_return(&s_job->karma) > s_job->sched->hang_limit)
> -		if (s_job->s_entity->guilty)
> -			atomic_set(s_job->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;
> @@ -466,7 +479,7 @@ void amd_sched_hw_job_reset(struct amd_gpu_scheduler *sched, struct amd_sched_jo
>   	}
>   	spin_unlock(&sched->job_list_lock);
>   
> -	if (bad) {
> +	if (bad && atomic_inc_return(&bad->karma) > bad->sched->hang_limit) {
>   		bool found = false;
>   
>   		for (i = AMD_SCHED_PRIORITY_MIN; i < AMD_SCHED_PRIORITY_MAX; i++ ) {
> @@ -476,7 +489,8 @@ void amd_sched_hw_job_reset(struct amd_gpu_scheduler *sched, struct amd_sched_jo
>   			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);
> +					if (entity->guilty)
> +						atomic_set(entity->guilty, 1);
>   					break;
>   				}
>   			}
> @@ -510,9 +524,17 @@ 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;
> +		bool found_guilty = false, skip;
> +		uint64_t guilty_context;

Well if you want the variables to have an effect you should probably 
move them outside the loop. Otherwise the code doesn't make much sense 
to me.

Regards,
Christian.

> +
> +		if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
> +			found_guilty = true;
> +			guilty_context = s_job->s_fence->scheduled.context;
> +		}
>   
> +		skip = (found_guilty && s_job->s_fence->scheduled.context == guilty_context);
>   		spin_unlock(&sched->job_list_lock);
> -		fence = sched->ops->run_job(s_job);
> +		fence = sched->ops->run_job(s_job, skip);
>   		atomic_inc(&sched->hw_rq_count);
>   		if (fence) {
>   			s_fence->parent = dma_fence_get(fence);
> @@ -525,7 +547,6 @@ 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);
> @@ -650,7 +671,7 @@ static int amd_sched_main(void *param)
>   		atomic_inc(&sched->hw_rq_count);
>   		amd_sched_job_begin(sched_job);
>   
> -		fence = sched->ops->run_job(sched_job);
> +		fence = sched->ops->run_job(sched_job, false);
>   		amd_sched_fence_scheduled(s_fence);
>   
>   		if (fence) {
> @@ -664,7 +685,6 @@ 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);
>   		}
>   
> diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
> index f9e3a83..a8e5a7d 100644
> --- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
> +++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
> @@ -126,7 +126,7 @@ static inline bool amd_sched_invalidate_job(struct amd_sched_job *s_job, int thr
>   */
>   struct amd_sched_backend_ops {
>   	struct dma_fence *(*dependency)(struct amd_sched_job *sched_job);
> -	struct dma_fence *(*run_job)(struct amd_sched_job *sched_job);
> +	struct dma_fence *(*run_job)(struct amd_sched_job *sched_job, bool skip);
>   	void (*timedout_job)(struct amd_sched_job *sched_job);
>   	void (*free_job)(struct amd_sched_job *sched_job);
>   };




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