On 11/04/2022 23:15, Dmitry Osipenko wrote:
> Interrupt context can't sleep. Drivers like Panfrost and MSM are taking
> mutex when job is released, and thus, that code can sleep. This results
> into "BUG: scheduling while atomic" if locks are contented while job is
> freed. There is no good reason for releasing scheduler's jobs in IRQ
> context, hence use normal context to fix the trouble.
>
> Cc: sta...@vger.kernel.org
> Fixes: 542cff7893a3 ("drm/sched: Avoid lockdep spalt on killing a processes")
> Signed-off-by: Dmitry Osipenko <dmitry.osipe...@collabora.com>
Reviewed-by: Steven Price <steven.pr...@arm.com>
> ---
> drivers/gpu/drm/scheduler/sched_entity.c | 6 +++---
> include/drm/gpu_scheduler.h | 4 ++--
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c
> b/drivers/gpu/drm/scheduler/sched_entity.c
> index 191c56064f19..6b25b2f4f5a3 100644
> --- a/drivers/gpu/drm/scheduler/sched_entity.c
> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> @@ -190,7 +190,7 @@ long drm_sched_entity_flush(struct drm_sched_entity
> *entity, long timeout)
> }
> EXPORT_SYMBOL(drm_sched_entity_flush);
>
> -static void drm_sched_entity_kill_jobs_irq_work(struct irq_work *wrk)
> +static void drm_sched_entity_kill_jobs_work(struct work_struct *wrk)
> {
> struct drm_sched_job *job = container_of(wrk, typeof(*job), work);
>
> @@ -207,8 +207,8 @@ static void drm_sched_entity_kill_jobs_cb(struct
> dma_fence *f,
> struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
> finish_cb);
>
> - init_irq_work(&job->work, drm_sched_entity_kill_jobs_irq_work);
> - irq_work_queue(&job->work);
> + INIT_WORK(&job->work, drm_sched_entity_kill_jobs_work);
> + schedule_work(&job->work);
> }
>
> static struct dma_fence *
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
> index 0fca8f38bee4..addb135eeea6 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -28,7 +28,7 @@
> #include <linux/dma-fence.h>
> #include <linux/completion.h>
> #include <linux/xarray.h>
> -#include <linux/irq_work.h>
> +#include <linux/workqueue.h>
>
> #define MAX_WAIT_SCHED_ENTITY_Q_EMPTY msecs_to_jiffies(1000)
>
> @@ -295,7 +295,7 @@ struct drm_sched_job {
> */
> union {
> struct dma_fence_cb finish_cb;
> - struct irq_work work;
> + struct work_struct work;
> };
>
> uint64_t id;
