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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* drivers/base/sync.c
*
* Copyright (C) 2012 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/anon_inodes.h>
#include "sync.h"
#define CREATE_TRACE_POINTS
#include "trace/sync.h"
static const struct fence_ops android_fence_ops;
struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops,
int size, const char *name)
{
struct sync_timeline *obj;
if (size < sizeof(struct sync_timeline))
return NULL;
obj = kzalloc(size, GFP_KERNEL);
if (!obj)
return NULL;
kref_init(&obj->kref);
obj->ops = ops;
obj->context = fence_context_alloc(1);
strlcpy(obj->name, name, sizeof(obj->name));
INIT_LIST_HEAD(&obj->child_list_head);
INIT_LIST_HEAD(&obj->active_list_head);
spin_lock_init(&obj->child_list_lock);
sync_timeline_debug_add(obj);
return obj;
}
EXPORT_SYMBOL(sync_timeline_create);
static void sync_timeline_free(struct kref *kref)
{
struct sync_timeline *obj =
container_of(kref, struct sync_timeline, kref);
sync_timeline_debug_remove(obj);
kfree(obj);
}
static void sync_timeline_get(struct sync_timeline *obj)
{
kref_get(&obj->kref);
}
static void sync_timeline_put(struct sync_timeline *obj)
{
kref_put(&obj->kref, sync_timeline_free);
}
void sync_timeline_destroy(struct sync_timeline *obj)
{
obj->destroyed = true;
/*
* Ensure timeline is marked as destroyed before
* changing timeline's fences status.
*/
smp_wmb();
sync_timeline_put(obj);
}
EXPORT_SYMBOL(sync_timeline_destroy);
void sync_timeline_signal(struct sync_timeline *obj)
{
unsigned long flags;
struct fence *fence, *next;
trace_sync_timeline(obj);
spin_lock_irqsave(&obj->child_list_lock, flags);
list_for_each_entry_safe(fence, next, &obj->active_list_head,
active_list) {
if (fence_is_signaled_locked(fence))
list_del_init(&fence->active_list);
}
spin_unlock_irqrestore(&obj->child_list_lock, flags);
}
EXPORT_SYMBOL(sync_timeline_signal);
struct fence *sync_pt_create(struct sync_timeline *obj, int size)
{
unsigned long flags;
struct fence *fence;
if (size < sizeof(*fence))
return NULL;
fence = kzalloc(size, GFP_KERNEL);
if (!fence)
return NULL;
spin_lock_irqsave(&obj->child_list_lock, flags);
sync_timeline_get(obj);
fence_init(fence, &android_fence_ops, &obj->child_list_lock,
obj->context, ++obj->value);
list_add_tail(&fence->child_list, &obj->child_list_head);
INIT_LIST_HEAD(&fence->active_list);
spin_unlock_irqrestore(&obj->child_list_lock, flags);
return fence;
}
EXPORT_SYMBOL(sync_pt_create);
static const char *android_fence_get_driver_name(struct fence *fence)
{
struct sync_timeline *parent = fence_parent(fence);
return parent->ops->driver_name;
}
static const char *android_fence_get_timeline_name(struct fence *fence)
{
struct sync_timeline *parent = fence_parent(fence);
return parent->name;
}
static void android_fence_release(struct fence *fence)
{
struct sync_timeline *parent = fence_parent(fence);
unsigned long flags;
spin_lock_irqsave(fence->lock, flags);
list_del(&fence->child_list);
if (WARN_ON_ONCE(!list_empty(&fence->active_list)))
list_del(&fence->active_list);
spin_unlock_irqrestore(fence->lock, flags);
sync_timeline_put(parent);
fence_free(fence);
}
static bool android_fence_signaled(struct fence *fence)
{
struct sync_timeline *parent = fence_parent(fence);
int ret;
ret = parent->ops->has_signaled(fence);
if (ret < 0)
fence->status = ret;
return ret;
}
static bool android_fence_enable_signaling(struct fence *fence)
{
struct sync_timeline *parent = fence_parent(fence);
if (android_fence_signaled(fence))
return false;
list_add_tail(&fence->active_list, &parent->active_list_head);
return true;
}
static void android_fence_value_str(struct fence *fence,
char *str, int size)
{
struct sync_timeline *parent = fence_parent(fence);
if (!parent->ops->fence_value_str) {
if (size)
*str = 0;
return;
}
parent->ops->fence_value_str(fence, str, size);
}
static void android_fence_timeline_value_str(struct fence *fence,
char *str, int size)
{
struct sync_timeline *parent = fence_parent(fence);
if (!parent->ops->timeline_value_str) {
if (size)
*str = 0;
return;
}
parent->ops->timeline_value_str(parent, str, size);
}
static const struct fence_ops android_fence_ops = {
.get_driver_name = android_fence_get_driver_name,
.get_timeline_name = android_fence_get_timeline_name,
.enable_signaling = android_fence_enable_signaling,
.signaled = android_fence_signaled,
.wait = fence_default_wait,
.release = android_fence_release,
.fence_value_str = android_fence_value_str,
.timeline_value_str = android_fence_timeline_value_str,
};
|
