8 #include <linux/dma-mapping.h>
891  * host1x_bo_pin() - Create a DMA mapping for the buffer object
895  * @cache: Cache in which to store mapping, or NULL
897  * Creates a DMA mapping pointing to @bo for @dev. The refcount of @bo is incremented
900  * If @cache is specified, the mapping is also stored in the cache and not released
908 	struct host1x_bo_mapping *mapping;  in host1x_bo_pin()  local
913 		list_for_each_entry(mapping, &cache->mappings, entry) {  in host1x_bo_pin()
914 			if (mapping->bo == bo && mapping->direction == dir) {  in host1x_bo_pin()
915 				kref_get(&mapping->ref);  in host1x_bo_pin()
922 	mapping = bo->ops->pin(dev, bo, dir);  in host1x_bo_pin()
923 	if (IS_ERR(mapping))  in host1x_bo_pin()
928 	spin_lock(&mapping->bo->lock);  in host1x_bo_pin()
929 	list_add_tail(&mapping->list, &bo->mappings);  in host1x_bo_pin()
930 	spin_unlock(&mapping->bo->lock);  in host1x_bo_pin()
933 		INIT_LIST_HEAD(&mapping->entry);  in host1x_bo_pin()
934 		mapping->cache = cache;  in host1x_bo_pin()
936 		list_add_tail(&mapping->entry, &cache->mappings);  in host1x_bo_pin()
939 		 * Bump the mapping reference count to track the mapping in the cache,  in host1x_bo_pin()
941 		 * triggering the release of the cache mapping through  in host1x_bo_pin()
944 		kref_get(&mapping->ref);  in host1x_bo_pin()
951 	return mapping;  in host1x_bo_pin()
957 	struct host1x_bo_mapping *mapping = to_host1x_bo_mapping(ref);  in __host1x_bo_unpin()  local
960 	 * When the last reference of the mapping goes away, make sure to remove the mapping from  in __host1x_bo_unpin()
963 	if (mapping->cache)  in __host1x_bo_unpin()
964 		list_del(&mapping->entry);  in __host1x_bo_unpin()
966 	spin_lock(&mapping->bo->lock);  in __host1x_bo_unpin()
967 	list_del(&mapping->list);  in __host1x_bo_unpin()
968 	spin_unlock(&mapping->bo->lock);  in __host1x_bo_unpin()
970 	mapping->bo->ops->unpin(mapping);  in __host1x_bo_unpin()
974  * host1x_bo_unpin() - Release an established DMA mapping of a buffer object
975  * @mapping: Mapping to release
977  * Unmaps the given @mapping, unless it is cached. Decreases the refcount on
980 void host1x_bo_unpin(struct host1x_bo_mapping *mapping)  in host1x_bo_unpin()  argument
982 	struct host1x_bo_cache *cache = mapping->cache;  in host1x_bo_unpin()
983 	struct host1x_bo *bo = mapping->bo;  in host1x_bo_unpin()
988 	kref_put(&mapping->ref, __host1x_bo_unpin);  in host1x_bo_unpin()
1007 	struct host1x_bo_mapping *mapping, *tmp;  in host1x_bo_clear_cached_mappings()  local
1010 	list_for_each_entry_safe(mapping, tmp, &bo->mappings, list) {  in host1x_bo_clear_cached_mappings()
1011 		cache = mapping->cache;  in host1x_bo_clear_cached_mappings()
1016 		WARN_ON(kref_read(&mapping->ref) != 1);  in host1x_bo_clear_cached_mappings()
1017 		__host1x_bo_unpin(&mapping->ref);  in host1x_bo_clear_cached_mappings()