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26 #ifndef __DRM_SYNCOBJ_H__
27 #define __DRM_SYNCOBJ_H__
29 #include <linux/dma-fence.h>
34 * struct drm_syncobj - sync object.
36 * This structure defines a generic sync object which wraps a &dma_fence.
40 * @refcount: Reference count of this object.
45 * NULL or a pointer to the fence bound to this object.
47 * This field should not be used directly. Use drm_syncobj_fence_get()
48 * and drm_syncobj_replace_fence() instead.
50 struct dma_fence __rcu *fence;
52 * @cb_list: List of callbacks to call when the &fence gets replaced.
54 struct list_head cb_list;
56 * @lock: Protects &cb_list and write-locks &fence.
60 * @file: A file backing for this syncobj.
65 void drm_syncobj_free(struct kref *kref);
68 * drm_syncobj_get - acquire a syncobj reference
71 * This acquires an additional reference to @obj. It is illegal to call this
72 * without already holding a reference. No locks required.
75 drm_syncobj_get(struct drm_syncobj *obj)
77 kref_get(&obj->refcount);
81 * drm_syncobj_put - release a reference to a sync object.
85 drm_syncobj_put(struct drm_syncobj *obj)
87 kref_put(&obj->refcount, drm_syncobj_free);
91 * drm_syncobj_fence_get - get a reference to a fence in a sync object
92 * @syncobj: sync object.
94 * This acquires additional reference to &drm_syncobj.fence contained in @obj,
95 * if not NULL. It is illegal to call this without already holding a reference.
99 * Either the fence of @obj or NULL if there's none.
101 static inline struct dma_fence *
102 drm_syncobj_fence_get(struct drm_syncobj *syncobj)
104 struct dma_fence *fence;
107 fence = dma_fence_get_rcu_safe(&syncobj->fence);
113 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
115 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
116 struct dma_fence *fence);
117 int drm_syncobj_find_fence(struct drm_file *file_private,
118 u32 handle, u64 point, u64 flags,
119 struct dma_fence **fence);
120 void drm_syncobj_free(struct kref *kref);
121 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
122 struct dma_fence *fence);
123 int drm_syncobj_get_handle(struct drm_file *file_private,
124 struct drm_syncobj *syncobj, u32 *handle);
125 int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd);