linux-kernel - [RFC PATCH 2/3] drm/sched: Use drm sched lockdep map for submit

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Message-Id: <20240730221742.2248527-3-matthew.brost@intel.com>
Date: Tue, 30 Jul 2024 15:17:41 -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: tj@...nel.org,
	jiangshanlai@...il.com,
	christian.koenig@....com,
	ltuikov89@...il.com,
	daniel@...ll.ch
Subject: [RFC PATCH 2/3] drm/sched: Use drm sched lockdep map for submit_wq

Avoid leaking a lockdep map on each drm sched creation and destruction
by using a single lockdep map for all drm sched allocated submit_wq.

Cc: Luben Tuikov <ltuikov89@...il.com>
Cc: Christian König <christian.koenig@....com>
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index ab53ab486fe6..9849fd64aff9 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -87,6 +87,12 @@
 #define CREATE_TRACE_POINTS
 #include "gpu_scheduler_trace.h"
 
+#ifdef CONFIG_LOCKDEP
+static struct lockdep_map drm_sched_lockdep_map = {
+	.name = "drm_sched_lockdep_map"
+};
+#endif
+
 #define to_drm_sched_job(sched_job)		\
 		container_of((sched_job), struct drm_sched_job, queue_node)
 
@@ -1272,9 +1278,13 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 		sched->submit_wq = submit_wq;
 		sched->own_submit_wq = false;
 	} else {
-		sched->submit_wq = alloc_ordered_workqueue(name, 0);
+		sched->submit_wq = alloc_ordered_workqueue(name, WQ_USER_OWNED_LOCKDEP);
 		if (!sched->submit_wq)
 			return -ENOMEM;
+#ifdef CONFIG_LOCKDEP
+		wq_init_user_lockdep_map(sched->submit_wq,
+					 &drm_sched_lockdep_map);
+#endif
 
 		sched->own_submit_wq = true;
 	}
-- 
2.34.1