[PATCH 2/6] drm/sched/tests: Port to cancel_job()

[Tvrtko Ursulin]

On 01/07/2025 14:21, Philipp Stanner wrote:
> The GPU Scheduler now supports a new callback, cancel_job(), which lets
> the scheduler cancel all jobs which might not yet be freed when
> drm_sched_fini() runs. Using this callback allows for significantly
> simplifying the mock scheduler teardown code.
> 
> Implement the cancel_job() callback and adjust the code where necessary.

Cross referencing against my version I think you missed this hunk:

--- a/drivers/gpu/drm/scheduler/tests/sched_tests.h
+++ b/drivers/gpu/drm/scheduler/tests/sched_tests.h
@@ -49,7 +49,6 @@ struct drm_mock_scheduler {

  	spinlock_t		lock;
  	struct list_head	job_list;
-	struct list_head	done_list;

  	struct {
  		u64		context;


I also had this:

@@ -97,7 +96,8 @@ struct drm_mock_sched_job {
  	struct completion	done;

  #define DRM_MOCK_SCHED_JOB_DONE		0x1
-#define DRM_MOCK_SCHED_JOB_TIMEDOUT	0x2
+#define DRM_MOCK_SCHED_JOB_CANCELED	0x2
+#define DRM_MOCK_SCHED_JOB_TIMEDOUT	0x4

And was setting it in the callback. And since we should add a test to 
explicitly cover the new callback, and just the callback, that could 
make it very easy to do it.

> Signed-off-by: Philipp Stanner <phasta at kernel.org>
> ---
>   .../gpu/drm/scheduler/tests/mock_scheduler.c  | 66 +++++++------------
>   1 file changed, 23 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
> index 49d067fecd67..2d3169d95200 100644
> --- a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
> +++ b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
> @@ -63,7 +63,7 @@ static void drm_mock_sched_job_complete(struct drm_mock_sched_job *job)
>   	lockdep_assert_held(&sched->lock);
>   
>   	job->flags |= DRM_MOCK_SCHED_JOB_DONE;
> -	list_move_tail(&job->link, &sched->done_list);
> +	list_del(&job->link);
>   	dma_fence_signal_locked(&job->hw_fence);
>   	complete(&job->done);
>   }
> @@ -236,26 +236,39 @@ mock_sched_timedout_job(struct drm_sched_job *sched_job)
>   
>   static void mock_sched_free_job(struct drm_sched_job *sched_job)
>   {
> -	struct drm_mock_scheduler *sched =
> -			drm_sched_to_mock_sched(sched_job->sched);
>   	struct drm_mock_sched_job *job = drm_sched_job_to_mock_job(sched_job);
> -	unsigned long flags;
>   
> -	/* Remove from the scheduler done list. */
> -	spin_lock_irqsave(&sched->lock, flags);
> -	list_del(&job->link);
> -	spin_unlock_irqrestore(&sched->lock, flags);
>   	dma_fence_put(&job->hw_fence);
> -
>   	drm_sched_job_cleanup(sched_job);
>   
>   	/* Mock job itself is freed by the kunit framework. */
>   }
>   
> +static void mock_sched_cancel_job(struct drm_sched_job *sched_job)
> +{
> +	struct drm_mock_scheduler *sched = drm_sched_to_mock_sched(sched_job->sched);
> +	struct drm_mock_sched_job *job = drm_sched_job_to_mock_job(sched_job);
> +	unsigned long flags;
> +
> +	hrtimer_cancel(&job->timer);
> +
> +	spin_lock_irqsave(&sched->lock, flags);
> +	if (!dma_fence_is_signaled_locked(&job->hw_fence)) {
> +		list_del(&job->link);
> +		dma_fence_set_error(&job->hw_fence, -ECANCELED);
> +		dma_fence_signal_locked(&job->hw_fence);
> +	}
> +	spin_unlock_irqrestore(&sched->lock, flags);
> +
> +	/* The GPU Scheduler will call drm_sched_backend_ops.free_job(), still.
> +	 * Mock job itself is freed by the kunit framework. */

/*
  * Multiline comment style to stay consistent, at least in this file.
  */

The rest looks good, but I need to revisit the timeout/free handling 
since it has been a while and you changed it recently.

Regards,

Tvrtko

> +}
> +
>   static const struct drm_sched_backend_ops drm_mock_scheduler_ops = {
>   	.run_job = mock_sched_run_job,
>   	.timedout_job = mock_sched_timedout_job,
> -	.free_job = mock_sched_free_job
> +	.free_job = mock_sched_free_job,
> +	.cancel_job = mock_sched_cancel_job,
>   };
>   
>   /**
> @@ -289,7 +302,6 @@ struct drm_mock_scheduler *drm_mock_sched_new(struct kunit *test, long timeout)
>   	sched->hw_timeline.context = dma_fence_context_alloc(1);
>   	atomic_set(&sched->hw_timeline.next_seqno, 0);
>   	INIT_LIST_HEAD(&sched->job_list);
> -	INIT_LIST_HEAD(&sched->done_list);
>   	spin_lock_init(&sched->lock);
>   
>   	return sched;
> @@ -304,38 +316,6 @@ struct drm_mock_scheduler *drm_mock_sched_new(struct kunit *test, long timeout)
>    */
>   void drm_mock_sched_fini(struct drm_mock_scheduler *sched)
>   {
> -	struct drm_mock_sched_job *job, *next;
> -	unsigned long flags;
> -	LIST_HEAD(list);
> -
> -	drm_sched_wqueue_stop(&sched->base);
> -
> -	/* Force complete all unfinished jobs. */
> -	spin_lock_irqsave(&sched->lock, flags);
> -	list_for_each_entry_safe(job, next, &sched->job_list, link)
> -		list_move_tail(&job->link, &list);
> -	spin_unlock_irqrestore(&sched->lock, flags);
> -
> -	list_for_each_entry(job, &list, link)
> -		hrtimer_cancel(&job->timer);
> -
> -	spin_lock_irqsave(&sched->lock, flags);
> -	list_for_each_entry_safe(job, next, &list, link)
> -		drm_mock_sched_job_complete(job);
> -	spin_unlock_irqrestore(&sched->lock, flags);
> -
> -	/*
> -	 * Free completed jobs and jobs not yet processed by the DRM scheduler
> -	 * free worker.
> -	 */
> -	spin_lock_irqsave(&sched->lock, flags);
> -	list_for_each_entry_safe(job, next, &sched->done_list, link)
> -		list_move_tail(&job->link, &list);
> -	spin_unlock_irqrestore(&sched->lock, flags);
> -
> -	list_for_each_entry_safe(job, next, &list, link)
> -		mock_sched_free_job(&job->base);
> -
>   	drm_sched_fini(&sched->base);
>   }
>