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.

v2:
 - Use alloc_ordered_workqueue_lockdep_map (Tejun)

Cc: Luben Tuikov <[email protected]>
Cc: Christian König <[email protected]>
Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maarten Lankhorst <[email protected]>

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)
 
@@ -1269,7 +1275,12 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 		sched->submit_wq = submit_wq;
 		sched->own_submit_wq = false;
 	} else {
+#ifdef CONFIG_LOCKDEP
+		sched->submit_wq = alloc_ordered_workqueue_lockdep_map(name, 0,
+								       &drm_sched_lockdep_map);
+#else
 		sched->submit_wq = alloc_ordered_workqueue(name, 0);
+#endif
 		if (!sched->submit_wq)
 			return -ENOMEM;