Re: [PATCH 1/8] drm/scheduler: properly forward fence errors

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Well good point, but as part of the effort of the Intel team to move the 
scheduler over to a work item based design those two functions are 
probably about to be removed.

Since we will probably have that in the internal package for a bit 
longer I'm going to send a fix for this.

Regards,
Christian.

Am 27.04.23 um 12:35 schrieb Yin, ZhenGuo (Chris):
> [AMD Official Use Only - General]
>
> Hi, Christian
>
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index fcd4bfef7415..649fac2e1ccb 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -533,12 +533,12 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
>   			r = dma_fence_add_callback(fence, &s_job->cb,
>   						   drm_sched_job_done_cb);
>   			if (r == -ENOENT)
> -				drm_sched_job_done(s_job);
> +				drm_sched_job_done(s_job, fence->error);
>   			else if (r)
>   				DRM_DEV_ERROR(sched->dev, "fence add callback failed (%d)\n",
>   					  r);
>   		} else
> -			drm_sched_job_done(s_job);
> +			drm_sched_job_done(s_job, 0);
>   	}
>   
>   	if (full_recovery) {
>
> I believe that the finished fence of some skipped jobs during FLR HASN'T been set to -ECANCELED.
> In function drm_sched_stop, the callback has been removed from hw_fence and s_fence->parent has been set to NULL, see commit 45ecaea738830b9d521c93520c8f201359dcbd95(drm/sched: Partial revert of 'drm/sched: Keep s_fence->parent pointer').
> In functnion drm_sched_start, jobs in the pending list pretend to be done without any errors(drm_sched_job_done(s_job, 0)).
>
>
> Best,
> Zhenguo
> Cloud-GPU Core team, SRDC
>
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> On Behalf Of Christian König
> Sent: Thursday, April 20, 2023 7:58 PM
> To: amd-gfx@lists.freedesktop.org
> Cc: Tuikov, Luben <Luben.Tuikov@amd.com>
> Subject: [PATCH 1/8] drm/scheduler: properly forward fence errors
>
> When a hw fence is signaled with an error properly forward that to the finished fence.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>   drivers/gpu/drm/scheduler/sched_entity.c |  4 +---  drivers/gpu/drm/scheduler/sched_fence.c  |  4 +++-
>   drivers/gpu/drm/scheduler/sched_main.c   | 18 ++++++++----------
>   include/drm/gpu_scheduler.h              |  2 +-
>   4 files changed, 13 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
> index 15d04a0ec623..eaf71fe15ed3 100644
> --- a/drivers/gpu/drm/scheduler/sched_entity.c
> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> @@ -144,7 +144,7 @@ static void drm_sched_entity_kill_jobs_work(struct work_struct *wrk)  {
>   	struct drm_sched_job *job = container_of(wrk, typeof(*job), work);
>   
> -	drm_sched_fence_finished(job->s_fence);
> +	drm_sched_fence_finished(job->s_fence, -ESRCH);
>   	WARN_ON(job->s_fence->parent);
>   	job->sched->ops->free_job(job);
>   }
> @@ -195,8 +195,6 @@ static void drm_sched_entity_kill(struct drm_sched_entity *entity)
>   	while ((job = to_drm_sched_job(spsc_queue_pop(&entity->job_queue)))) {
>   		struct drm_sched_fence *s_fence = job->s_fence;
>   
> -		dma_fence_set_error(&s_fence->finished, -ESRCH);
> -
>   		dma_fence_get(&s_fence->finished);
>   		if (!prev || dma_fence_add_callback(prev, &job->finish_cb,
>   					   drm_sched_entity_kill_jobs_cb)) diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c
> index 7fd869520ef2..1a6bea98c5cc 100644
> --- a/drivers/gpu/drm/scheduler/sched_fence.c
> +++ b/drivers/gpu/drm/scheduler/sched_fence.c
> @@ -53,8 +53,10 @@ void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
>   	dma_fence_signal(&fence->scheduled);
>   }
>   
> -void drm_sched_fence_finished(struct drm_sched_fence *fence)
> +void drm_sched_fence_finished(struct drm_sched_fence *fence, int
> +result)
>   {
> +	if (result)
> +		dma_fence_set_error(&fence->finished, result);
>   	dma_fence_signal(&fence->finished);
>   }
>   
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index fcd4bfef7415..649fac2e1ccb 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -257,7 +257,7 @@ drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq)
>    *
>    * Finish the job's fence and wake up the worker thread.
>    */
> -static void drm_sched_job_done(struct drm_sched_job *s_job)
> +static void drm_sched_job_done(struct drm_sched_job *s_job, int result)
>   {
>   	struct drm_sched_fence *s_fence = s_job->s_fence;
>   	struct drm_gpu_scheduler *sched = s_fence->sched; @@ -268,7 +268,7 @@ static void drm_sched_job_done(struct drm_sched_job *s_job)
>   	trace_drm_sched_process_job(s_fence);
>   
>   	dma_fence_get(&s_fence->finished);
> -	drm_sched_fence_finished(s_fence);
> +	drm_sched_fence_finished(s_fence, result);
>   	dma_fence_put(&s_fence->finished);
>   	wake_up_interruptible(&sched->wake_up_worker);
>   }
> @@ -282,7 +282,7 @@ static void drm_sched_job_done_cb(struct dma_fence *f, struct dma_fence_cb *cb)  {
>   	struct drm_sched_job *s_job = container_of(cb, struct drm_sched_job, cb);
>   
> -	drm_sched_job_done(s_job);
> +	drm_sched_job_done(s_job, f->error);
>   }
>   
>   /**
> @@ -533,12 +533,12 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
>   			r = dma_fence_add_callback(fence, &s_job->cb,
>   						   drm_sched_job_done_cb);
>   			if (r == -ENOENT)
> -				drm_sched_job_done(s_job);
> +				drm_sched_job_done(s_job, fence->error);
>   			else if (r)
>   				DRM_DEV_ERROR(sched->dev, "fence add callback failed (%d)\n",
>   					  r);
>   		} else
> -			drm_sched_job_done(s_job);
> +			drm_sched_job_done(s_job, 0);
>   	}
>   
>   	if (full_recovery) {
> @@ -1010,15 +1010,13 @@ static int drm_sched_main(void *param)
>   			r = dma_fence_add_callback(fence, &sched_job->cb,
>   						   drm_sched_job_done_cb);
>   			if (r == -ENOENT)
> -				drm_sched_job_done(sched_job);
> +				drm_sched_job_done(sched_job, fence->error);
>   			else if (r)
>   				DRM_DEV_ERROR(sched->dev, "fence add callback failed (%d)\n",
>   					  r);
>   		} else {
> -			if (IS_ERR(fence))
> -				dma_fence_set_error(&s_fence->finished, PTR_ERR(fence));
> -
> -			drm_sched_job_done(sched_job);
> +			drm_sched_job_done(sched_job, IS_ERR(fence) ?
> +					   PTR_ERR(fence) : 0);
>   		}
>   
>   		wake_up(&sched->job_scheduled);
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index ca857ec9e7eb..5c1df6b12ced 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -569,7 +569,7 @@ void drm_sched_fence_init(struct drm_sched_fence *fence,  void drm_sched_fence_free(struct drm_sched_fence *fence);
>   
>   void drm_sched_fence_scheduled(struct drm_sched_fence *fence); -void drm_sched_fence_finished(struct drm_sched_fence *fence);
> +void drm_sched_fence_finished(struct drm_sched_fence *fence, int
> +result);
>   
>   unsigned long drm_sched_suspend_timeout(struct drm_gpu_scheduler *sched);  void drm_sched_resume_timeout(struct drm_gpu_scheduler *sched,
> --
> 2.34.1