linux-kernel - [RFC PATCH 2/3] drm/sched: Taint workqueues with reclaim

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Message-Id: <20251021213952.746900-3-matthew.brost@intel.com>
Date: Tue, 21 Oct 2025 14:39:51 -0700
From: Matthew Brost <matthew.brost@...el.com>
To: intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: jiangshanlai@...il.com,
	tj@...nel.org,
	simona.vetter@...ll.ch,
	christian.koenig@....com,
	pstanner@...hat.com,
	dakr@...nel.org
Subject: [RFC PATCH 2/3] drm/sched: Taint workqueues with reclaim

Multiple drivers seemingly do not understand the role of DMA fences in
the reclaim path. As a result, DRM scheduler workqueues, which are part
of the fence signaling path, must not allocate memory. This patch
teaches lockdep to recognize these rules in order to catch driver-side
bugs.

Cc: Christian König <christian.koenig@....com>
Cc: Danilo Krummrich <dakr@...nel.org>
Cc: Matthew Brost <matthew.brost@...el.com>
Cc: Philipp Stanner <phasta@...nel.org>
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index c39f0245e3a9..676484dd3ea3 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -1368,6 +1368,9 @@ int drm_sched_init(struct drm_gpu_scheduler *sched, const struct drm_sched_init_
 	atomic64_set(&sched->job_id_count, 0);
 	sched->pause_submit = false;
 
+	taint_reclaim_workqueue(sched->submit_wq, GFP_KERNEL);
+	taint_reclaim_workqueue(sched->timeout_wq, GFP_KERNEL);
+
 	sched->ready = true;
 	return 0;
 Out_unroll:
-- 
2.34.1