[PATCH 8/8] drm/panfrost: Use DRM_GPU_SCHED_STAT_RUNNING to skip the reset

[Steven Price]

On 03/05/2025 21:59, Maíra Canal wrote:
> Panfrost can skip the reset if TDR has fired before the IRQ handler.
> Currently, since Panfrost doesn't take any action on these scenarios, the
> job is being leaked, considering that `free_job()` won't be called.
> 
> To avoid such leaks, use the DRM_GPU_SCHED_STAT_RUNNING status to skip the
> reset and rearm the timer.
> 
> Signed-off-by: Maíra Canal <mcanal at igalia.com>

Reviewed-by: Steven Price <steven.price at arm.com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_job.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 5657106c2f7d0a0ca6162850767f58f3200cce13..2948d5c02115544a0e0babffd850f1506152849d 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -751,11 +751,11 @@ static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job
>  	int js = panfrost_job_get_slot(job);
>  
>  	/*
> -	 * If the GPU managed to complete this jobs fence, the timeout is
> -	 * spurious. Bail out.
> +	 * If the GPU managed to complete this jobs fence, TDR has fired before
> +	 * IRQ and the timeout is spurious. Bail out.
>  	 */
>  	if (dma_fence_is_signaled(job->done_fence))
> -		return DRM_GPU_SCHED_STAT_NOMINAL;
> +		return DRM_GPU_SCHED_STAT_RUNNING;
>  
>  	/*
>  	 * Panfrost IRQ handler may take a long time to process an interrupt
> @@ -770,7 +770,7 @@ static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job
>  
>  	if (dma_fence_is_signaled(job->done_fence)) {
>  		dev_warn(pfdev->dev, "unexpectedly high interrupt latency\n");
> -		return DRM_GPU_SCHED_STAT_NOMINAL;
> +		return DRM_GPU_SCHED_STAT_RUNNING;
>  	}
>  
>  	dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p",
>