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-rw-r--r--include/drm/drm_gem.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 87cffc9efa85..f28a48a6f846 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -175,6 +175,41 @@ struct drm_gem_object_funcs {
};
/**
+ * struct drm_gem_lru - A simple LRU helper
+ *
+ * A helper for tracking GEM objects in a given state, to aid in
+ * driver's shrinker implementation. Tracks the count of pages
+ * for lockless &shrinker.count_objects, and provides
+ * &drm_gem_lru_scan for driver's &shrinker.scan_objects
+ * implementation.
+ */
+struct drm_gem_lru {
+ /**
+ * @lock:
+ *
+ * Lock protecting movement of GEM objects between LRUs. All
+ * LRUs that the object can move between should be protected
+ * by the same lock.
+ */
+ struct mutex *lock;
+
+ /**
+ * @count:
+ *
+ * The total number of backing pages of the GEM objects in
+ * this LRU.
+ */
+ long count;
+
+ /**
+ * @list:
+ *
+ * The LRU list.
+ */
+ struct list_head list;
+};
+
+/**
* struct drm_gem_object - GEM buffer object
*
* This structure defines the generic parts for GEM buffer objects, which are
@@ -312,6 +347,20 @@ struct drm_gem_object {
*
*/
const struct drm_gem_object_funcs *funcs;
+
+ /**
+ * @lru_node:
+ *
+ * List node in a &drm_gem_lru.
+ */
+ struct list_head lru_node;
+
+ /**
+ * @lru:
+ *
+ * The current LRU list that the GEM object is on.
+ */
+ struct drm_gem_lru *lru;
};
/**
@@ -420,4 +469,10 @@ void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
u32 handle, u64 *offset);
+void drm_gem_lru_init(struct drm_gem_lru *lru, struct mutex *lock);
+void drm_gem_lru_remove(struct drm_gem_object *obj);
+void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj);
+unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan,
+ bool (*shrink)(struct drm_gem_object *obj));
+
#endif /* __DRM_GEM_H__ */