[PATCH v3 1/2] drm/sched: Add boolean to mark if sched is ready to work v2

* [PATCH v3 1/2] drm/sched: Add boolean to mark if sched is ready to work v2
@ 2018-10-22 20:46 Andrey Grodzovsky
       [not found] ` <1540241214-21077-1-git-send-email-andrey.grodzovsky-5C7GfCeVMHo@public.gmane.org>
  0 siblings, 1 reply; 4+ messages in thread
From: Andrey Grodzovsky @ 2018-10-22 20:46 UTC (permalink / raw)
  To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW
  Cc: Alexander.Deucher-5C7GfCeVMHo, Andrey Grodzovsky,
	christian.koenig-5C7GfCeVMHo

Problem:
A particular scheduler may become unsuable (underlying HW) after
some event (e.g. GPU reset). If it's later chosen by
the get free sched. policy a command will fail to be
submitted.

Fix:
Add a driver specific callback to report the sched status so
rq with bad sched can be avoided in favor of working one or
none in which case job init will fail.

v2: Switch from driver callback to flag in scheduler.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c |  2 +-
 drivers/gpu/drm/etnaviv/etnaviv_sched.c   |  2 +-
 drivers/gpu/drm/scheduler/sched_entity.c  |  9 ++++++++-
 drivers/gpu/drm/scheduler/sched_main.c    | 10 +++++++++-
 drivers/gpu/drm/v3d/v3d_sched.c           |  4 ++--
 include/drm/gpu_scheduler.h               |  5 ++++-
 6 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 5448cf2..bf845b0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -450,7 +450,7 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
 
 		r = drm_sched_init(&ring->sched, &amdgpu_sched_ops,
 				   num_hw_submission, amdgpu_job_hang_limit,
-				   timeout, ring->name);
+				   timeout, ring->name, false);
 		if (r) {
 			DRM_ERROR("Failed to create scheduler on ring %s.\n",
 				  ring->name);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
index f8c5f1e..9dca347 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
@@ -178,7 +178,7 @@ int etnaviv_sched_init(struct etnaviv_gpu *gpu)
 
 	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
 			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
-			     msecs_to_jiffies(500), dev_name(gpu->dev));
+			     msecs_to_jiffies(500), dev_name(gpu->dev), true);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 3e22a54..ba54c30 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -130,7 +130,14 @@ drm_sched_entity_get_free_sched(struct drm_sched_entity *entity)
 	int i;
 
 	for (i = 0; i < entity->num_rq_list; ++i) {
-		num_jobs = atomic_read(&entity->rq_list[i]->sched->num_jobs);
+		struct drm_gpu_scheduler *sched = entity->rq_list[i]->sched;
+
+		if (!entity->rq_list[i]->sched->ready) {
+			DRM_WARN("sched%s is not ready, skipping", sched->name);
+			continue;
+		}
+
+		num_jobs = atomic_read(&sched->num_jobs);
 		if (num_jobs < min_jobs) {
 			min_jobs = num_jobs;
 			rq = entity->rq_list[i];
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 63b997d..772adec 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -420,6 +420,9 @@ int drm_sched_job_init(struct drm_sched_job *job,
 	struct drm_gpu_scheduler *sched;
 
 	drm_sched_entity_select_rq(entity);
+	if (!entity->rq)
+		return -ENOENT;
+
 	sched = entity->rq->sched;
 
 	job->sched = sched;
@@ -598,6 +601,7 @@ static int drm_sched_main(void *param)
  * @hang_limit: number of times to allow a job to hang before dropping it
  * @timeout: timeout value in jiffies for the scheduler
  * @name: name used for debugging
+ * @ready: marks if the underlying HW is ready to work
  *
  * Return 0 on success, otherwise error code.
  */
@@ -606,7 +610,8 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 		   unsigned hw_submission,
 		   unsigned hang_limit,
 		   long timeout,
-		   const char *name)
+		   const char *name,
+		   bool	ready)
 {
 	int i;
 	sched->ops = ops;
@@ -633,6 +638,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 		return PTR_ERR(sched->thread);
 	}
 
+	sched->ready = ready;
 	return 0;
 }
 EXPORT_SYMBOL(drm_sched_init);
@@ -648,5 +654,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
 {
 	if (sched->thread)
 		kthread_stop(sched->thread);
+
+	sched->ready = false;
 }
 EXPORT_SYMBOL(drm_sched_fini);
diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
index 80b641f..7cedb5f 100644
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -212,7 +212,7 @@ v3d_sched_init(struct v3d_dev *v3d)
 			     &v3d_sched_ops,
 			     hw_jobs_limit, job_hang_limit,
 			     msecs_to_jiffies(hang_limit_ms),
-			     "v3d_bin");
+			     "v3d_bin", true);
 	if (ret) {
 		dev_err(v3d->dev, "Failed to create bin scheduler: %d.", ret);
 		return ret;
@@ -222,7 +222,7 @@ v3d_sched_init(struct v3d_dev *v3d)
 			     &v3d_sched_ops,
 			     hw_jobs_limit, job_hang_limit,
 			     msecs_to_jiffies(hang_limit_ms),
-			     "v3d_render");
+			     "v3d_render", true);
 	if (ret) {
 		dev_err(v3d->dev, "Failed to create render scheduler: %d.",
 			ret);
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
index 0684dcd..037caea 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -264,6 +264,7 @@ struct drm_sched_backend_ops {
  * @hang_limit: once the hangs by a job crosses this limit then it is marked
  *              guilty and it will be considered for scheduling further.
  * @num_jobs: the number of jobs in queue in the scheduler
+ * @ready: marks if the underlying HW is ready to work
  *
  * One scheduler is implemented for each hardware ring.
  */
@@ -283,12 +284,14 @@ struct drm_gpu_scheduler {
 	spinlock_t			job_list_lock;
 	int				hang_limit;
 	atomic_t                        num_jobs;
+	bool			ready;
 };
 
 int drm_sched_init(struct drm_gpu_scheduler *sched,
 		   const struct drm_sched_backend_ops *ops,
 		   uint32_t hw_submission, unsigned hang_limit, long timeout,
-		   const char *name);
+		   const char *name,
+		   bool	ready);
 void drm_sched_fini(struct drm_gpu_scheduler *sched);
 int drm_sched_job_init(struct drm_sched_job *job,
 		       struct drm_sched_entity *entity,
-- 
2.7.4

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