drm/sched: move fence slab handling to module init/exit

This is the only part of the scheduler which must not be called from
different drivers. Move it to module init/exit so it is done a single
time when loading the scheduler.

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -912,10 +912,6 @@ static int __init amdgpu_init(void)
 	if (r)
 		goto error_fence;
 
-	r = drm_sched_fence_slab_init();
-	if (r)
-		goto error_sched;
-
 	if (vgacon_text_force()) {
 		DRM_ERROR("VGACON disables amdgpu kernel modesetting.\n");
 		return -EINVAL;
@@ -928,9 +924,6 @@ static int __init amdgpu_init(void)
 	/* let modprobe override vga console setting */
 	return pci_register_driver(pdriver);
 
-error_sched:
-	amdgpu_fence_slab_fini();
-
 error_fence:
 	amdgpu_sync_fini();
 
@@ -944,7 +937,6 @@ static void __exit amdgpu_exit(void)
 	pci_unregister_driver(pdriver);
 	amdgpu_unregister_atpx_handler();
 	amdgpu_sync_fini();
-	drm_sched_fence_slab_fini();
 	amdgpu_fence_slab_fini();
 }
 

drivers/gpu/drm/scheduler/sched_fence.c

@@ -29,7 +29,7 @@
 
 static struct kmem_cache *sched_fence_slab;
 
-int drm_sched_fence_slab_init(void)
+static int __init drm_sched_fence_slab_init(void)
 {
 	sched_fence_slab = kmem_cache_create(
 		"drm_sched_fence", sizeof(struct drm_sched_fence), 0,
@@ -39,14 +39,12 @@ int drm_sched_fence_slab_init(void)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(drm_sched_fence_slab_init);
 
-void drm_sched_fence_slab_fini(void)
+static void __exit drm_sched_fence_slab_fini(void)
 {
 	rcu_barrier();
 	kmem_cache_destroy(sched_fence_slab);
 }
-EXPORT_SYMBOL_GPL(drm_sched_fence_slab_fini);
 
 void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
 {
@@ -185,3 +183,9 @@ struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
 
 	return fence;
 }
+
+module_init(drm_sched_fence_slab_init);
+module_exit(drm_sched_fence_slab_fini);
+
+MODULE_DESCRIPTION("DRM GPU scheduler");
+MODULE_LICENSE("GPL and additional rights");

include/drm/gpu_scheduler.h

@@ -155,9 +155,6 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
 void drm_sched_entity_set_rq(struct drm_sched_entity *entity,
 			     struct drm_sched_rq *rq);
 
-int drm_sched_fence_slab_init(void);
-void drm_sched_fence_slab_fini(void);
-
 struct drm_sched_fence *drm_sched_fence_create(
 	struct drm_sched_entity *s_entity, void *owner);
 void drm_sched_fence_scheduled(struct drm_sched_fence *fence);