drm/ttm: make TTM responsible for cleaning system only.

Drivers should all be cleaning up their memory managers
themselves now, so let the core just clean the system one up.

Remove the legacy cleaning interface.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200804025632.3868079-36-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1450,42 +1450,6 @@ int ttm_mem_type_manager_force_list_clean(struct ttm_bo_device *bdev,
 }
 EXPORT_SYMBOL(ttm_mem_type_manager_force_list_clean);
 
-int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
-{
-	struct ttm_mem_type_manager *man;
-	int ret = -EINVAL;
-
-	if (mem_type >= TTM_NUM_MEM_TYPES) {
-		pr_err("Illegal memory type %d\n", mem_type);
-		return ret;
-	}
-	man = &bdev->man[mem_type];
-
-	if (!man->has_type) {
-		pr_err("Trying to take down uninitialized memory manager type %u\n",
-		       mem_type);
-		return ret;
-	}
-
-	ttm_mem_type_manager_disable(man);
-
-	ret = 0;
-	if (mem_type > 0) {
-		ret = ttm_mem_type_manager_force_list_clean(bdev, man);
-		if (ret) {
-			pr_err("Cleanup eviction failed\n");
-			return ret;
-		}
-
-		if (man->func->takedown)
-			ret = (*man->func->takedown)(man);
-	}
-
-	ttm_mem_type_manager_cleanup(man);
-
-	return ret;
-}
-EXPORT_SYMBOL(ttm_bo_clean_mm);
 
 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 {
@@ -1589,21 +1553,11 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
 {
 	struct ttm_bo_global *glob = &ttm_bo_glob;
 	int ret = 0;
-	unsigned i = TTM_NUM_MEM_TYPES;
+	unsigned i;
 	struct ttm_mem_type_manager *man;
 
-	while (i--) {
-		man = &bdev->man[i];
-		if (man->has_type) {
-			man->use_type = false;
-			if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
-				ret = -EBUSY;
-				pr_err("DRM memory manager type %d is not clean\n",
-				       i);
-			}
-			man->has_type = false;
-		}
-	}
+	man = &bdev->man[TTM_PL_SYSTEM];
+	ttm_mem_type_manager_disable(man);
 
 	mutex_lock(&ttm_global_mutex);
 	list_del(&bdev->device_list);
@@ -1616,7 +1570,7 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
 
 	spin_lock(&glob->lru_lock);
 	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
-		if (list_empty(&bdev->man[0].lru[0]))
+		if (list_empty(&man->lru[0]))
 			pr_debug("Swap list %d was clean\n", i);
 	spin_unlock(&glob->lru_lock);
 

include/drm/ttm/ttm_bo_api.h

@@ -546,34 +546,6 @@ void ttm_mem_type_manager_init(struct ttm_bo_device *bdev,
 			       struct ttm_mem_type_manager *man,
 			       unsigned long p_size);
 
-/**
- * ttm_bo_clean_mm
- *
- * @bdev: Pointer to a ttm_bo_device struct.
- * @mem_type: The memory type.
- *
- * Take down a manager for a given memory type after first walking
- * the LRU list to evict any buffers left alive.
- *
- * Normally, this function is part of lastclose() or unload(), and at that
- * point there shouldn't be any buffers left created by user-space, since
- * there should've been removed by the file descriptor release() method.
- * However, before this function is run, make sure to signal all sync objects,
- * and verify that the delayed delete queue is empty. The driver must also
- * make sure that there are no NO_EVICT buffers present in this memory type
- * when the call is made.
- *
- * If this function is part of a VT switch, the caller must make sure that
- * there are no appications currently validating buffers before this
- * function is called. The caller can do that by first taking the
- * struct ttm_bo_device::ttm_lock in write mode.
- *
- * Returns:
- * -EINVAL: invalid or uninitialized memory type.
- * -EBUSY: There are still buffers left in this memory type.
- */
-int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type);
-
 /**
  * ttm_bo_evict_mm
  *

include/drm/ttm/ttm_bo_driver.h

@@ -48,16 +48,6 @@
 struct ttm_mem_type_manager;
 
 struct ttm_mem_type_manager_func {
-	/**
-	 * struct ttm_mem_type_manager member takedown
-	 *
-	 * @man: Pointer to a memory type manager.
-	 *
-	 * Called to undo the setup done in init. All allocated resources
-	 * should be freed.
-	 */
-	int  (*takedown)(struct ttm_mem_type_manager *man);
-
 	/**
 	 * struct ttm_mem_type_manager member get_node
 	 *