Am 18.10.18 um 20:44 schrieb Andrey Grodzovsky:
> 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 sced. status so
> rq with bad sched. can be avoided in favor of working one or
> none in which case job init will fail.
I would rather go with the approach of moving the ready flag completely
into the scheduler instead.
Christian.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzov...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 9 ++++++++-
> drivers/gpu/drm/etnaviv/etnaviv_sched.c | 3 ++-
> drivers/gpu/drm/scheduler/sched_entity.c | 11 ++++++++++-
> drivers/gpu/drm/scheduler/sched_main.c | 8 +++++++-
> drivers/gpu/drm/v3d/v3d_sched.c | 3 ++-
> include/drm/gpu_scheduler.h | 5 ++++-
> 6 files changed, 33 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> index 5448cf2..bbfe7f501 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> @@ -404,6 +404,13 @@ int amdgpu_fence_driver_start_ring(struct amdgpu_ring
> *ring,
> return 0;
> }
>
> +static bool amdgpu_ring_ready(struct drm_gpu_scheduler *sched)
> +{
> + struct amdgpu_ring *ring = to_amdgpu_ring(sched);
> +
> + return ring->ready;
> +}
> +
> /**
> * amdgpu_fence_driver_init_ring - init the fence driver
> * for the requested ring.
> @@ -450,7 +457,7 @@ 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, amdgpu_ring_ready);
> 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..5094013 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> @@ -178,7 +178,8 @@ 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),
> + NULL);
> if (ret)
> return ret;
>
> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c
> b/drivers/gpu/drm/scheduler/sched_entity.c
> index 3e22a54..320c77a 100644
> --- a/drivers/gpu/drm/scheduler/sched_entity.c
> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> @@ -130,7 +130,16 @@ 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 &&
> + !entity->rq_list[i]->sched->ready(sched)) {
> + 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..6b151f2 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;
> @@ -606,7 +609,8 @@ 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)(struct drm_gpu_scheduler *sched))
> {
> int i;
> sched->ops = ops;
> @@ -633,6 +637,8 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
> return PTR_ERR(sched->thread);
> }
>
> + sched->ready = ready;
> +
> return 0;
> }
> EXPORT_SYMBOL(drm_sched_init);
> diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
> index 80b641f..e06cc0d 100644
> --- a/drivers/gpu/drm/v3d/v3d_sched.c
> +++ b/drivers/gpu/drm/v3d/v3d_sched.c
> @@ -212,7 +212,8 @@ 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",
> + NULL);
> if (ret) {
> dev_err(v3d->dev, "Failed to create bin scheduler: %d.", ret);
> return ret;
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
> index 0684dcd..a6e18fe 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -283,12 +283,15 @@ struct drm_gpu_scheduler {
> spinlock_t job_list_lock;
> int hang_limit;
> atomic_t num_jobs;
> +
> + bool (*ready)(struct drm_gpu_scheduler *sched);
> };
>
> 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)(struct drm_gpu_scheduler *sched));
> void drm_sched_fini(struct drm_gpu_scheduler *sched);
> int drm_sched_job_init(struct drm_sched_job *job,
> struct drm_sched_entity *entity,
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