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