Re: [PATCH v7 3/6] drm/sched: Convert the GPU scheduler to variable number of run-queues

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On 2023-10-26 00:12, Matthew Brost wrote:
> From: Luben Tuikov <luben.tuikov@xxxxxxx>
> 
> The GPU scheduler has now a variable number of run-queues, which are set up at
> drm_sched_init() time. This way, each driver announces how many run-queues it
> requires (supports) per each GPU scheduler it creates. Note, that run-queues
> correspond to scheduler "priorities", thus if the number of run-queues is set
> to 1 at drm_sched_init(), then that scheduler supports a single run-queue,
> i.e. single "priority". If a driver further sets a single entity per
> run-queue, then this creates a 1-to-1 correspondence between a scheduler and
> a scheduled entity.
> 
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Russell King <linux+etnaviv@xxxxxxxxxxxxxxx>
> Cc: Qiang Yu <yuq825@xxxxxxxxx>
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
> Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
> Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Cc: Emma Anholt <emma@xxxxxxxxxx>
> Cc: etnaviv@xxxxxxxxxxxxxxxxxxxxx
> Cc: lima@xxxxxxxxxxxxxxxxxxxxx
> Cc: linux-arm-msm@xxxxxxxxxxxxxxx
> Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx
> Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Luben Tuikov <luben.tuikov@xxxxxxx>
> Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>

Normally, you'd add your R-B.

You should add your S-O-B tag, if you've co-authored/contributed to the commit
or are the actual committer to drm-*, as "dim" requires it, but dim will tell you,
so generally, I don't do that unless the tool tells me to. :-) 

So here, feel free to R-B the patch instead of S-O-B, on a patch post.

Regards,
Luben

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_job.c    |  4 +-
>  drivers/gpu/drm/etnaviv/etnaviv_sched.c    |  3 +-
>  drivers/gpu/drm/lima/lima_sched.c          |  3 +-
>  drivers/gpu/drm/msm/msm_ringbuffer.c       |  3 +-
>  drivers/gpu/drm/nouveau/nouveau_sched.c    |  1 +
>  drivers/gpu/drm/panfrost/panfrost_job.c    |  3 +-
>  drivers/gpu/drm/scheduler/sched_entity.c   | 18 +++++-
>  drivers/gpu/drm/scheduler/sched_main.c     | 75 ++++++++++++++++++----
>  drivers/gpu/drm/v3d/v3d_sched.c            | 14 ++--
>  include/drm/gpu_scheduler.h                |  9 ++-
>  11 files changed, 102 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index b54c4d771104..94d073bfbd13 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -2280,6 +2280,7 @@ static int amdgpu_device_init_schedulers(struct amdgpu_device *adev)
>  		}
>  
>  		r = drm_sched_init(&ring->sched, &amdgpu_sched_ops, NULL,
> +				   DRM_SCHED_PRIORITY_COUNT,
>  				   ring->num_hw_submission, 0,
>  				   timeout, adev->reset_domain->wq,
>  				   ring->sched_score, ring->name,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> index 78476bc75b4e..1f357198533f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> @@ -325,8 +325,8 @@ void amdgpu_job_stop_all_jobs_on_sched(struct drm_gpu_scheduler *sched)
>  	int i;
>  
>  	/* Signal all jobs not yet scheduled */
> -	for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
> -		struct drm_sched_rq *rq = &sched->sched_rq[i];
> +	for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
> +		struct drm_sched_rq *rq = sched->sched_rq[i];
>  		spin_lock(&rq->lock);
>  		list_for_each_entry(s_entity, &rq->entities, list) {
>  			while ((s_job = to_drm_sched_job(spsc_queue_pop(&s_entity->job_queue)))) {
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> index 618a804ddc34..396334984e4d 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> @@ -134,7 +134,8 @@ int etnaviv_sched_init(struct etnaviv_gpu *gpu)
>  {
>  	int ret;
>  
> -	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops, NULL,
> +	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
> +			     DRM_SCHED_PRIORITY_COUNT, NULL,
>  			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
>  			     msecs_to_jiffies(500), NULL, NULL,
>  			     dev_name(gpu->dev), gpu->dev);
> diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
> index 8d858aed0e56..23a6276f1332 100644
> --- a/drivers/gpu/drm/lima/lima_sched.c
> +++ b/drivers/gpu/drm/lima/lima_sched.c
> @@ -488,7 +488,8 @@ int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
>  
>  	INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
>  
> -	return drm_sched_init(&pipe->base, &lima_sched_ops, NULL, 1,
> +	return drm_sched_init(&pipe->base, &lima_sched_ops,
> +			      DRM_SCHED_PRIORITY_COUNT, NULL, 1,
>  			      lima_job_hang_limit,
>  			      msecs_to_jiffies(timeout), NULL,
>  			      NULL, name, pipe->ldev->dev);
> diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
> index 1097f8e93d6b..935154979fc2 100644
> --- a/drivers/gpu/drm/msm/msm_ringbuffer.c
> +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
> @@ -94,7 +94,8 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
>  	 /* currently managing hangcheck ourselves: */
>  	sched_timeout = MAX_SCHEDULE_TIMEOUT;
>  
> -	ret = drm_sched_init(&ring->sched, &msm_sched_ops, NULL,
> +	ret = drm_sched_init(&ring->sched, &msm_sched_ops,
> +			     DRM_SCHED_PRIORITY_COUNT, NULL,
>  			     num_hw_submissions, 0, sched_timeout,
>  			     NULL, NULL, to_msm_bo(ring->bo)->name,
>  			     gpu->dev->dev);
> diff --git a/drivers/gpu/drm/nouveau/nouveau_sched.c b/drivers/gpu/drm/nouveau/nouveau_sched.c
> index 4c959dec42b3..c4ba56b1a6dd 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_sched.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_sched.c
> @@ -436,6 +436,7 @@ int nouveau_sched_init(struct nouveau_drm *drm)
>  		return -ENOMEM;
>  
>  	return drm_sched_init(sched, &nouveau_sched_ops, NULL,
> +			      DRM_SCHED_PRIORITY_COUNT,
>  			      NOUVEAU_SCHED_HW_SUBMISSIONS, 0, job_hang_limit,
>  			      NULL, NULL, "nouveau_sched", drm->dev->dev);
>  }
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 934b7b930c76..205d62c04f96 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -852,7 +852,8 @@ int panfrost_job_init(struct panfrost_device *pfdev)
>  		js->queue[j].fence_context = dma_fence_context_alloc(1);
>  
>  		ret = drm_sched_init(&js->queue[j].sched,
> -				     &panfrost_sched_ops, NULL,
> +				     &panfrost_sched_ops,
> +				     DRM_SCHED_PRIORITY_COUNT, NULL,
>  				     nentries, 0,
>  				     msecs_to_jiffies(JOB_TIMEOUT_MS),
>  				     pfdev->reset.wq,
> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
> index a42763e1429d..409e4256f6e7 100644
> --- a/drivers/gpu/drm/scheduler/sched_entity.c
> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> @@ -75,8 +75,20 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
>  	RCU_INIT_POINTER(entity->last_scheduled, NULL);
>  	RB_CLEAR_NODE(&entity->rb_tree_node);
>  
> -	if(num_sched_list)
> -		entity->rq = &sched_list[0]->sched_rq[entity->priority];
> +	if (!sched_list[0]->sched_rq) {
> +		/* Warn drivers not to do this and to fix their DRM
> +		 * calling order.
> +		 */
> +		pr_warn("%s: called with uninitialized scheduler\n", __func__);
> +	} else if (num_sched_list) {
> +		/* The "priority" of an entity cannot exceed the number
> +		 * of run-queues of a scheduler.
> +		 */
> +		if (entity->priority >= sched_list[0]->num_rqs)
> +			entity->priority = max_t(u32, sched_list[0]->num_rqs,
> +						 DRM_SCHED_PRIORITY_MIN);
> +		entity->rq = sched_list[0]->sched_rq[entity->priority];
> +	}
>  
>  	init_completion(&entity->entity_idle);
>  
> @@ -533,7 +545,7 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
>  
>  	spin_lock(&entity->rq_lock);
>  	sched = drm_sched_pick_best(entity->sched_list, entity->num_sched_list);
> -	rq = sched ? &sched->sched_rq[entity->priority] : NULL;
> +	rq = sched ? sched->sched_rq[entity->priority] : NULL;
>  	if (rq != entity->rq) {
>  		drm_sched_rq_remove_entity(entity->rq, entity);
>  		entity->rq = rq;
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index 3a955b8acc4e..b22157e920d4 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -641,8 +641,14 @@ int drm_sched_job_init(struct drm_sched_job *job,
>  		       struct drm_sched_entity *entity,
>  		       void *owner)
>  {
> -	if (!entity->rq)
> +	if (!entity->rq) {
> +		/* This will most likely be followed by missing frames
> +		 * or worse--a blank screen--leave a trail in the
> +		 * logs, so this can be debugged easier.
> +		 */
> +		drm_err(job->sched, "%s: entity has no rq!\n", __func__);
>  		return -ENOENT;
> +	}
>  
>  	job->entity = entity;
>  	job->s_fence = drm_sched_fence_alloc(entity, owner);
> @@ -680,7 +686,7 @@ void drm_sched_job_arm(struct drm_sched_job *job)
>  	sched = entity->rq->sched;
>  
>  	job->sched = sched;
> -	job->s_priority = entity->rq - sched->sched_rq;
> +	job->s_priority = entity->priority;
>  	job->id = atomic64_inc_return(&sched->job_id_count);
>  
>  	drm_sched_fence_init(job->s_fence, job->entity);
> @@ -897,10 +903,10 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
>  		return NULL;
>  
>  	/* Kernel run queue has higher priority than normal run queue*/
> -	for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
> +	for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
>  		entity = drm_sched_policy == DRM_SCHED_POLICY_FIFO ?
> -			drm_sched_rq_select_entity_fifo(&sched->sched_rq[i]) :
> -			drm_sched_rq_select_entity_rr(&sched->sched_rq[i]);
> +			drm_sched_rq_select_entity_fifo(sched->sched_rq[i]) :
> +			drm_sched_rq_select_entity_rr(sched->sched_rq[i]);
>  		if (entity)
>  			break;
>  	}
> @@ -1065,6 +1071,7 @@ static void drm_sched_main(struct work_struct *w)
>   * @ops: backend operations for this scheduler
>   * @submit_wq: workqueue to use for submission. If NULL, an ordered wq is
>   *	       allocated and used
> + * @num_rqs: number of runqueues, one for each priority, up to DRM_SCHED_PRIORITY_COUNT
>   * @hw_submission: number of hw submissions that can be in flight
>   * @hang_limit: number of times to allow a job to hang before dropping it
>   * @timeout: timeout value in jiffies for the scheduler
> @@ -1079,11 +1086,12 @@ static void drm_sched_main(struct work_struct *w)
>  int drm_sched_init(struct drm_gpu_scheduler *sched,
>  		   const struct drm_sched_backend_ops *ops,
>  		   struct workqueue_struct *submit_wq,
> -		   unsigned hw_submission, unsigned hang_limit,
> +		   u32 num_rqs, unsigned hw_submission, unsigned hang_limit,
>  		   long timeout, struct workqueue_struct *timeout_wq,
>  		   atomic_t *score, const char *name, struct device *dev)
>  {
> -	int i;
> +	int i, ret;
> +
>  	sched->ops = ops;
>  	sched->hw_submission_limit = hw_submission;
>  	sched->name = name;
> @@ -1102,8 +1110,36 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
>  	sched->hang_limit = hang_limit;
>  	sched->score = score ? score : &sched->_score;
>  	sched->dev = dev;
> -	for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_COUNT; i++)
> -		drm_sched_rq_init(sched, &sched->sched_rq[i]);
> +
> +	if (num_rqs > DRM_SCHED_PRIORITY_COUNT) {
> +		/* This is a gross violation--tell drivers what the  problem is.
> +		 */
> +		drm_err(sched, "%s: num_rqs cannot be greater than DRM_SCHED_PRIORITY_COUNT\n",
> +			__func__);
> +		return -EINVAL;
> +	} else if (sched->sched_rq) {
> +		/* Not an error, but warn anyway so drivers can
> +		 * fine-tune their DRM calling order, and return all
> +		 * is good.
> +		 */
> +		drm_warn(sched, "%s: scheduler already initialized!\n", __func__);
> +		return 0;
> +	}
> +
> +	sched->sched_rq = kmalloc_array(num_rqs, sizeof(*sched->sched_rq),
> +					GFP_KERNEL | __GFP_ZERO);
> +	if (!sched->sched_rq) {
> +		drm_err(sched, "%s: out of memory for sched_rq\n", __func__);
> +		return -ENOMEM;
> +	}
> +	sched->num_rqs = num_rqs;
> +	ret = -ENOMEM;
> +	for (i = DRM_SCHED_PRIORITY_MIN; i < sched->num_rqs; i++) {
> +		sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]), GFP_KERNEL);
> +		if (!sched->sched_rq[i])
> +			goto Out_unroll;
> +		drm_sched_rq_init(sched, sched->sched_rq[i]);
> +	}
>  
>  	init_waitqueue_head(&sched->job_scheduled);
>  	INIT_LIST_HEAD(&sched->pending_list);
> @@ -1117,6 +1153,14 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
>  
>  	sched->ready = true;
>  	return 0;
> +
> +Out_unroll:
> +	for (--i ; i >= DRM_SCHED_PRIORITY_MIN; i--)
> +		kfree(sched->sched_rq[i]);
> +	kfree(sched->sched_rq);
> +	sched->sched_rq = NULL;
> +	drm_err(sched, "%s: Failed to setup GPU scheduler--out of memory\n", __func__);
> +	return ret;
>  }
>  EXPORT_SYMBOL(drm_sched_init);
>  
> @@ -1134,8 +1178,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>  
>  	drm_sched_wqueue_stop(sched);
>  
> -	for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
> -		struct drm_sched_rq *rq = &sched->sched_rq[i];
> +	for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
> +		struct drm_sched_rq *rq = sched->sched_rq[i];
>  
>  		spin_lock(&rq->lock);
>  		list_for_each_entry(s_entity, &rq->entities, list)
> @@ -1146,7 +1190,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>  			 */
>  			s_entity->stopped = true;
>  		spin_unlock(&rq->lock);
> -
> +		kfree(sched->sched_rq[i]);
>  	}
>  
>  	/* Wakeup everyone stuck in drm_sched_entity_flush for this scheduler */
> @@ -1158,6 +1202,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
>  	if (sched->own_submit_wq)
>  		destroy_workqueue(sched->submit_wq);
>  	sched->ready = false;
> +	kfree(sched->sched_rq);
> +	sched->sched_rq = NULL;
>  }
>  EXPORT_SYMBOL(drm_sched_fini);
>  
> @@ -1184,9 +1230,10 @@ void drm_sched_increase_karma(struct drm_sched_job *bad)
>  	if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
>  		atomic_inc(&bad->karma);
>  
> -		for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
> +		for (i = DRM_SCHED_PRIORITY_MIN;
> +		     i < min_t(typeof(sched->num_rqs), sched->num_rqs, DRM_SCHED_PRIORITY_KERNEL);
>  		     i++) {
> -			struct drm_sched_rq *rq = &sched->sched_rq[i];
> +			struct drm_sched_rq *rq = sched->sched_rq[i];
>  
>  			spin_lock(&rq->lock);
>  			list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
> diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
> index 38e092ea41e6..175c3e30647a 100644
> --- a/drivers/gpu/drm/v3d/v3d_sched.c
> +++ b/drivers/gpu/drm/v3d/v3d_sched.c
> @@ -388,7 +388,7 @@ v3d_sched_init(struct v3d_dev *v3d)
>  	int ret;
>  
>  	ret = drm_sched_init(&v3d->queue[V3D_BIN].sched,
> -			     &v3d_bin_sched_ops, NULL,
> +			     &v3d_bin_sched_ops, DRM_SCHED_PRIORITY_COUNT, NULL,
>  			     hw_jobs_limit, job_hang_limit,
>  			     msecs_to_jiffies(hang_limit_ms), NULL,
>  			     NULL, "v3d_bin", v3d->drm.dev);
> @@ -396,15 +396,15 @@ v3d_sched_init(struct v3d_dev *v3d)
>  		return ret;
>  
>  	ret = drm_sched_init(&v3d->queue[V3D_RENDER].sched,
> -			     &v3d_render_sched_ops, NULL,
> -			     hw_jobs_limit, job_hang_limit,
> +			     &v3d_render_sched_ops, DRM_SCHED_PRIORITY_COUNT,
> +			     NULL, hw_jobs_limit, job_hang_limit,
>  			     msecs_to_jiffies(hang_limit_ms), NULL,
>  			     NULL, "v3d_render", v3d->drm.dev);
>  	if (ret)
>  		goto fail;
>  
>  	ret = drm_sched_init(&v3d->queue[V3D_TFU].sched,
> -			     &v3d_tfu_sched_ops, NULL,
> +			     &v3d_tfu_sched_ops, DRM_SCHED_PRIORITY_COUNT, NULL,
>  			     hw_jobs_limit, job_hang_limit,
>  			     msecs_to_jiffies(hang_limit_ms), NULL,
>  			     NULL, "v3d_tfu", v3d->drm.dev);
> @@ -413,7 +413,8 @@ v3d_sched_init(struct v3d_dev *v3d)
>  
>  	if (v3d_has_csd(v3d)) {
>  		ret = drm_sched_init(&v3d->queue[V3D_CSD].sched,
> -				     &v3d_csd_sched_ops, NULL,
> +				     &v3d_csd_sched_ops,
> +				     DRM_SCHED_PRIORITY_COUNT, NULL,
>  				     hw_jobs_limit, job_hang_limit,
>  				     msecs_to_jiffies(hang_limit_ms), NULL,
>  				     NULL, "v3d_csd", v3d->drm.dev);
> @@ -421,7 +422,8 @@ v3d_sched_init(struct v3d_dev *v3d)
>  			goto fail;
>  
>  		ret = drm_sched_init(&v3d->queue[V3D_CACHE_CLEAN].sched,
> -				     &v3d_cache_clean_sched_ops, NULL,
> +				     &v3d_cache_clean_sched_ops,
> +				     DRM_SCHED_PRIORITY_COUNT, NULL,
>  				     hw_jobs_limit, job_hang_limit,
>  				     msecs_to_jiffies(hang_limit_ms), NULL,
>  				     NULL, "v3d_cache_clean", v3d->drm.dev);
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
> index 211bd3cdabdc..1d52b8bbb06c 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -472,7 +472,9 @@ struct drm_sched_backend_ops {
>   * @hw_submission_limit: the max size of the hardware queue.
>   * @timeout: the time after which a job is removed from the scheduler.
>   * @name: name of the ring for which this scheduler is being used.
> - * @sched_rq: priority wise array of run queues.
> + * @num_rqs: Number of run-queues. This is at most DRM_SCHED_PRIORITY_COUNT,
> + *           as there's usually one run-queue per priority, but could be less.
> + * @sched_rq: An allocated array of run-queues of size @num_rqs;
>   * @job_scheduled: once @drm_sched_entity_do_release is called the scheduler
>   *                 waits on this wait queue until all the scheduled jobs are
>   *                 finished.
> @@ -502,7 +504,8 @@ struct drm_gpu_scheduler {
>  	uint32_t			hw_submission_limit;
>  	long				timeout;
>  	const char			*name;
> -	struct drm_sched_rq		sched_rq[DRM_SCHED_PRIORITY_COUNT];
> +	u32                             num_rqs;
> +	struct drm_sched_rq             **sched_rq;
>  	wait_queue_head_t		job_scheduled;
>  	atomic_t			hw_rq_count;
>  	atomic64_t			job_id_count;
> @@ -525,7 +528,7 @@ struct drm_gpu_scheduler {
>  int drm_sched_init(struct drm_gpu_scheduler *sched,
>  		   const struct drm_sched_backend_ops *ops,
>  		   struct workqueue_struct *submit_wq,
> -		   uint32_t hw_submission, unsigned hang_limit,
> +		   u32 num_rqs, uint32_t hw_submission, unsigned hang_limit,
>  		   long timeout, struct workqueue_struct *timeout_wq,
>  		   atomic_t *score, const char *name, struct device *dev);
>  




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