Re: [PATCH 1/2] drm/scheduler: Add job dependency trace.

On Tue, Jul 31, 2018 at 10:56:53AM -0400, Andrey Grodzovsky wrote:

During debug sessions I encountered a need to trace back a job dependecy a few steps back to the first failing job. This trace helpped me a lot.

Signed-off-by: Andrey Grodzovsky andrey.grodzovsky@amd.com

Series are Reviewed-by: Huang Rui ray.huang@amd.com

---

drivers/gpu/drm/scheduler/gpu_scheduler.c | 8 ++++++-- drivers/gpu/drm/scheduler/gpu_scheduler_trace.h | 24 ++++++++++++++++++++++++ 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c index 3f2fc5e..45703b9 100644 --- a/drivers/gpu/drm/scheduler/gpu_scheduler.c +++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c @@ -506,9 +506,13 @@ drm_sched_entity_pop_job(struct drm_sched_entity *entity) if (!sched_job) return NULL;

• while ((entity->dependency = sched->ops->dependency(sched_job, entity)))

• if (drm_sched_entity_add_dependency_cb(entity))
  

• while ((entity->dependency = sched->ops->dependency(sched_job, entity))) {

• if (drm_sched_entity_add_dependency_cb(entity)) {
  

• 	trace_drm_sched_job_wait_dep(sched_job, entity->dependency);
  return NULL;
  

• }
  

• }

  /* skip jobs from entity that marked guilty */ if (entity->guilty && atomic_read(entity->guilty))

diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h index 4998ad9..1626f39 100644 --- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h +++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h @@ -74,6 +74,30 @@ TRACE_EVENT(drm_sched_process_job, TP_printk("fence=%p signaled", __entry->fence) );

+TRACE_EVENT(drm_sched_job_wait_dep,

•    TP_PROTO(struct drm_sched_job *sched_job, struct dma_fence *fence),
  

•    TP_ARGS(sched_job, fence),
  

•    TP_STRUCT__entry(
  

• 	     __field(const char *,name)
  

• 	     __field(uint64_t, id)
  

• 	     __field(struct dma_fence *, fence)
  

• 	     __field(uint64_t, ctx)
  

• 	     __field(unsigned, seqno)
  

• 	     ),
  

•    TP_fast_assign(
  

• 	   __entry->name = sched_job->sched->name;
  

• 	   __entry->id = sched_job->id;
  

• 	   __entry->fence = fence;
  

• 	   __entry->ctx = fence->context;
  

• 	   __entry->seqno = fence->seqno;
  

• 	   ),
  

•    TP_printk("job ring=%s, id=%llu, depends fence=%p, context=%llu, seq=%u",
  

•       __entry->name, __entry->id,
  

•       __entry->fence, __entry->ctx,
  

•       __entry->seqno)
  

+);

#endif

/* This part must be outside protection */

2.7.4

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