linux-kernel - [PATCH v2] drm/sched: Add warning for removing hack in drm_sched

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Message-ID: <20251017112543.177674-2-phasta@kernel.org>
Date: Fri, 17 Oct 2025 13:25:44 +0200
From: Philipp Stanner <phasta@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Matthew Brost <matthew.brost@...el.com>,
	Philipp Stanner <phasta@...nel.org>,
	Christian König <ckoenig.leichtzumerken@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
	Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [PATCH v2] drm/sched: Add warning for removing hack in drm_sched_fini()

The assembled developers agreed at the X.Org Developers Conference 2025
that the hack added for amdgpu in drm_sched_fini() shall be removed. It
shouldn't be needed by amdgpu anymore.

As it's unclear whether all drivers really follow the life time rule of
entities having to be torn down before their scheduler, it is reasonable
to warn for a while before removing the hack.

Add a warning in drm_sched_fini() that fires if an entity is still
active.

Signed-off-by: Philipp Stanner <phasta@...nel.org>
---
Changes in v2:
  - Fix broken brackets.
---
 drivers/gpu/drm/scheduler/sched_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 46119aacb809..87ea373f266e 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -1419,7 +1419,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
 		struct drm_sched_rq *rq = sched->sched_rq[i];
 
 		spin_lock(&rq->lock);
-		list_for_each_entry(s_entity, &rq->entities, list)
+		list_for_each_entry(s_entity, &rq->entities, list) {
 			/*
 			 * Prevents reinsertion and marks job_queue as idle,
 			 * it will be removed from the rq in drm_sched_entity_fini()
@@ -1441,7 +1441,10 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
 			 * drivers that keep entities alive for longer than
 			 * the scheduler.
 			 */
+			if (!s_entity->stopped)
+				dev_warn(sched->dev, "Tearing down scheduler with active entities!\n");
 			s_entity->stopped = true;
+		}
 		spin_unlock(&rq->lock);
 		kfree(sched->sched_rq[i]);
 	}
-- 
2.49.0