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TOMOYO Linux Cross Reference
Linux/include/drm/drm_syncobj.h

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  1 /*
  2  * Copyright © 2017 Red Hat
  3  *
  4  * Permission is hereby granted, free of charge, to any person obtaining a
  5  * copy of this software and associated documentation files (the "Software"),
  6  * to deal in the Software without restriction, including without limitation
  7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8  * and/or sell copies of the Software, and to permit persons to whom the
  9  * Software is furnished to do so, subject to the following conditions:
 10  *
 11  * The above copyright notice and this permission notice (including the next
 12  * paragraph) shall be included in all copies or substantial portions of the
 13  * Software.
 14  *
 15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 21  * IN THE SOFTWARE.
 22  *
 23  * Authors:
 24  *
 25  */
 26 #ifndef __DRM_SYNCOBJ_H__
 27 #define __DRM_SYNCOBJ_H__
 28 
 29 #include "linux/dma-fence.h"
 30 
 31 struct drm_syncobj_cb;
 32 
 33 /**
 34  * struct drm_syncobj - sync object.
 35  *
 36  * This structure defines a generic sync object which wraps a dma fence.
 37  */
 38 struct drm_syncobj {
 39         /**
 40          * @refcount:
 41          *
 42          * Reference count of this object.
 43          */
 44         struct kref refcount;
 45         /**
 46          * @fence:
 47          * NULL or a pointer to the fence bound to this object.
 48          *
 49          * This field should not be used directly.  Use drm_syncobj_fence_get
 50          * and drm_syncobj_replace_fence instead.
 51          */
 52         struct dma_fence *fence;
 53         /**
 54          * @cb_list:
 55          * List of callbacks to call when the fence gets replaced
 56          */
 57         struct list_head cb_list;
 58         /**
 59          * @lock:
 60          * locks cb_list and write-locks fence.
 61          */
 62         spinlock_t lock;
 63         /**
 64          * @file:
 65          * a file backing for this syncobj.
 66          */
 67         struct file *file;
 68 };
 69 
 70 typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
 71                                    struct drm_syncobj_cb *cb);
 72 
 73 /**
 74  * struct drm_syncobj_cb - callback for drm_syncobj_add_callback
 75  * @node: used by drm_syncob_add_callback to append this struct to
 76  *        syncobj::cb_list
 77  * @func: drm_syncobj_func_t to call
 78  *
 79  * This struct will be initialized by drm_syncobj_add_callback, additional
 80  * data can be passed along by embedding drm_syncobj_cb in another struct.
 81  * The callback will get called the next time drm_syncobj_replace_fence is
 82  * called.
 83  */
 84 struct drm_syncobj_cb {
 85         struct list_head node;
 86         drm_syncobj_func_t func;
 87 };
 88 
 89 void drm_syncobj_free(struct kref *kref);
 90 
 91 /**
 92  * drm_syncobj_get - acquire a syncobj reference
 93  * @obj: sync object
 94  *
 95  * This acquires additional reference to @obj. It is illegal to call this
 96  * without already holding a reference. No locks required.
 97  */
 98 static inline void
 99 drm_syncobj_get(struct drm_syncobj *obj)
100 {
101         kref_get(&obj->refcount);
102 }
103 
104 /**
105  * drm_syncobj_put - release a reference to a sync object.
106  * @obj: sync object.
107  */
108 static inline void
109 drm_syncobj_put(struct drm_syncobj *obj)
110 {
111         kref_put(&obj->refcount, drm_syncobj_free);
112 }
113 
114 static inline struct dma_fence *
115 drm_syncobj_fence_get(struct drm_syncobj *syncobj)
116 {
117         struct dma_fence *fence;
118 
119         rcu_read_lock();
120         fence = dma_fence_get_rcu_safe(&syncobj->fence);
121         rcu_read_unlock();
122 
123         return fence;
124 }
125 
126 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
127                                      u32 handle);
128 void drm_syncobj_add_callback(struct drm_syncobj *syncobj,
129                               struct drm_syncobj_cb *cb,
130                               drm_syncobj_func_t func);
131 void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
132                                  struct drm_syncobj_cb *cb);
133 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
134                                struct dma_fence *fence);
135 int drm_syncobj_find_fence(struct drm_file *file_private,
136                            u32 handle,
137                            struct dma_fence **fence);
138 void drm_syncobj_free(struct kref *kref);
139 
140 #endif
141 

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