[PATCH 2/2] drm/scheduler: Change scheduled fence track

[Alex Deucher]

+ dri-devel since GPU scheduler is a shared component.

On Wed, Apr 7, 2021 at 9:31 AM Roy Sun <Roy.Sun at amd.com> wrote:
>
> Update the timestamp of scheduled fence on HW
> completion of the previous fences
>
> This allow more accurate tracking of the fence
> execution in HW
>
> Signed-off-by: David M Nieto <david.nieto at amd.com>
> Signed-off-by: Roy Sun <Roy.Sun at amd.com>
> ---
>  drivers/gpu/drm/scheduler/sched_main.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index 92d8de24d0a1..4e5d8d4af010 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -515,7 +515,7 @@ void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
>  EXPORT_SYMBOL(drm_sched_resubmit_jobs);
>
>  /**
> - * drm_sched_resubmit_jobs_ext - helper to relunch certain number of jobs from mirror ring list
> + * drm_sched_resubmit_jobs_ext - helper to relunch certain number of jobs from pending list
>   *
>   * @sched: scheduler instance
>   * @max: job numbers to relaunch
> @@ -671,7 +671,7 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
>  static struct drm_sched_job *
>  drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
>  {
> -       struct drm_sched_job *job;
> +       struct drm_sched_job *job, *next;
>
>         /*
>          * Don't destroy jobs while the timeout worker is running  OR thread
> @@ -690,6 +690,13 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
>         if (job && dma_fence_is_signaled(&job->s_fence->finished)) {
>                 /* remove job from pending_list */
>                 list_del_init(&job->list);
> +               /* account for the next fence in the queue */
> +               next = list_first_entry_or_null(&sched->pending_list,
> +                               struct drm_sched_job, list);
> +               if (next) {
> +                       next->s_fence->scheduled.timestamp =
> +                               job->s_fence->finished.timestamp;
> +               }
>         } else {
>                 job = NULL;
>                 /* queue timeout for next job */
> --
> 2.31.1
>
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