projects/linux·blob uaccess-cleanups · refs

221 lines · 4.6 KiB

1/*
2 * sync / sw_sync abstraction
3 * Copyright 2015-2016 Collabora Ltd.
4 *
5 * Based on the implementation from the Android Open Source Project,
6 *
7 * Copyright 2012 Google, Inc
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28#include <fcntl.h>
29#include <malloc.h>
30#include <poll.h>
31#include <stdint.h>
32#include <string.h>
33#include <unistd.h>
34
35#include <sys/ioctl.h>
36#include <sys/stat.h>
37#include <sys/types.h>
38
39#include "sync.h"
40#include "sw_sync.h"
41
42#include <linux/sync_file.h>
43
44
45/* SW_SYNC ioctls */
46struct sw_sync_create_fence_data {
47 __u32 value;
48 char name[32];
49 __s32 fence;
50};
51
52#define SW_SYNC_IOC_MAGIC 'W'
53#define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
54 struct sw_sync_create_fence_data)
55#define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
56
57
58int sync_wait(int fd, int timeout)
59{
60 struct pollfd fds;
61
62 fds.fd = fd;
63 fds.events = POLLIN | POLLERR;
64
65 return poll(&fds, 1, timeout);
66}
67
68int sync_merge(const char *name, int fd1, int fd2)
69{
70 struct sync_merge_data data = {};
71 int err;
72
73 data.fd2 = fd2;
74 strncpy(data.name, name, sizeof(data.name) - 1);
75 data.name[sizeof(data.name) - 1] = '\0';
76
77 err = ioctl(fd1, SYNC_IOC_MERGE, &data);
78 if (err < 0)
79 return err;
80
81 return data.fence;
82}
83
84static struct sync_file_info *sync_file_info(int fd)
85{
86 struct sync_file_info *info;
87 struct sync_fence_info *fence_info;
88 int err, num_fences;
89
90 info = calloc(1, sizeof(*info));
91 if (info == NULL)
92 return NULL;
93
94 err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
95 if (err < 0) {
96 free(info);
97 return NULL;
98 }
99
100 num_fences = info->num_fences;
101
102 if (num_fences) {
103 info->flags = 0;
104 info->num_fences = num_fences;
105
106 fence_info = calloc(num_fences, sizeof(*fence_info));
107 if (!fence_info) {
108 free(info);
109 return NULL;
110 }
111
112 info->sync_fence_info = (uint64_t)(unsigned long)fence_info;
113
114 err = ioctl(fd, SYNC_IOC_FILE_INFO, info);
115 if (err < 0) {
116 free(fence_info);
117 free(info);
118 return NULL;
119 }
120 }
121
122 return info;
123}
124
125static void sync_file_info_free(struct sync_file_info *info)
126{
127 free((void *)(unsigned long)info->sync_fence_info);
128 free(info);
129}
130
131int sync_fence_size(int fd)
132{
133 int count;
134 struct sync_file_info *info = sync_file_info(fd);
135
136 if (!info)
137 return 0;
138
139 count = info->num_fences;
140
141 sync_file_info_free(info);
142
143 return count;
144}
145
146int sync_fence_count_with_status(int fd, int status)
147{
148 unsigned int i, count = 0;
149 struct sync_fence_info *fence_info = NULL;
150 struct sync_file_info *info = sync_file_info(fd);
151
152 if (!info)
153 return -1;
154
155 fence_info = (struct sync_fence_info *)(unsigned long)info->sync_fence_info;
156 for (i = 0 ; i < info->num_fences ; i++) {
157 if (fence_info[i].status == status)
158 count++;
159 }
160
161 sync_file_info_free(info);
162
163 return count;
164}
165
166int sw_sync_timeline_create(void)
167{
168 return open("/sys/kernel/debug/sync/sw_sync", O_RDWR);
169}
170
171int sw_sync_timeline_inc(int fd, unsigned int count)
172{
173 __u32 arg = count;
174
175 return ioctl(fd, SW_SYNC_IOC_INC, &arg);
176}
177
178int sw_sync_timeline_is_valid(int fd)
179{
180 int status;
181
182 if (fd == -1)
183 return 0;
184
185 status = fcntl(fd, F_GETFD, 0);
186 return (status >= 0);
187}
188
189void sw_sync_timeline_destroy(int fd)
190{
191 if (sw_sync_timeline_is_valid(fd))
192 close(fd);
193}
194
195int sw_sync_fence_create(int fd, const char *name, unsigned int value)
196{
197 struct sw_sync_create_fence_data data = {};
198 int err;
199
200 data.value = value;
201 strncpy(data.name, name, sizeof(data.name) - 1);
202 data.name[sizeof(data.name) - 1] = '\0';
203
204 err = ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);
205 if (err < 0)
206 return err;
207
208 return data.fence;
209}
210
211int sw_sync_fence_is_valid(int fd)
212{
213 /* Same code! */
214 return sw_sync_timeline_is_valid(fd);
215}
216
217void sw_sync_fence_destroy(int fd)
218{
219 if (sw_sync_fence_is_valid(fd))
220 close(fd);
221}