Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/base/sync.c |
| 3 | * |
| 4 | * Copyright (C) 2012 Google, Inc. |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/debugfs.h> |
| 18 | #include <linux/export.h> |
| 19 | #include <linux/file.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/uaccess.h> |
| 27 | #include <linux/anon_inodes.h> |
Tapasweni Pathak | 353fdf1 | 2014-10-26 19:20:16 +0530 | [diff] [blame] | 28 | #include <linux/time64.h> |
Gustavo Padovan | 460bfc4 | 2016-04-28 10:46:57 -0300 | [diff] [blame] | 29 | #include <linux/sync_file.h> |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 30 | #include <linux/types.h> |
| 31 | #include <linux/kconfig.h> |
| 32 | |
| 33 | #include "uapi/sw_sync.h" |
| 34 | #include "sync.h" |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 35 | |
| 36 | #ifdef CONFIG_DEBUG_FS |
| 37 | |
Gustavo Padovan | 8a00448 | 2016-01-21 10:49:17 -0200 | [diff] [blame] | 38 | static struct dentry *dbgfs; |
| 39 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 40 | static LIST_HEAD(sync_timeline_list_head); |
| 41 | static DEFINE_SPINLOCK(sync_timeline_list_lock); |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 42 | static LIST_HEAD(sync_file_list_head); |
| 43 | static DEFINE_SPINLOCK(sync_file_list_lock); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 44 | |
| 45 | void sync_timeline_debug_add(struct sync_timeline *obj) |
| 46 | { |
| 47 | unsigned long flags; |
| 48 | |
| 49 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 50 | list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head); |
| 51 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 52 | } |
| 53 | |
| 54 | void sync_timeline_debug_remove(struct sync_timeline *obj) |
| 55 | { |
| 56 | unsigned long flags; |
| 57 | |
| 58 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 59 | list_del(&obj->sync_timeline_list); |
| 60 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 61 | } |
| 62 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 63 | void sync_file_debug_add(struct sync_file *sync_file) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 64 | { |
| 65 | unsigned long flags; |
| 66 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 67 | spin_lock_irqsave(&sync_file_list_lock, flags); |
| 68 | list_add_tail(&sync_file->sync_file_list, &sync_file_list_head); |
| 69 | spin_unlock_irqrestore(&sync_file_list_lock, flags); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 70 | } |
| 71 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 72 | void sync_file_debug_remove(struct sync_file *sync_file) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 73 | { |
| 74 | unsigned long flags; |
| 75 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 76 | spin_lock_irqsave(&sync_file_list_lock, flags); |
| 77 | list_del(&sync_file->sync_file_list); |
| 78 | spin_unlock_irqrestore(&sync_file_list_lock, flags); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static const char *sync_status_str(int status) |
| 82 | { |
| 83 | if (status == 0) |
| 84 | return "signaled"; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 85 | |
| 86 | if (status > 0) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 87 | return "active"; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 88 | |
| 89 | return "error"; |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 92 | static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 93 | { |
| 94 | int status = 1; |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 95 | struct sync_timeline *parent = fence_parent(fence); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 96 | |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 97 | if (fence_is_signaled_locked(fence)) |
| 98 | status = fence->status; |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 99 | |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 100 | seq_printf(s, " %s%sfence %s", |
| 101 | show ? parent->name : "", |
| 102 | show ? "_" : "", |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 103 | sync_status_str(status)); |
| 104 | |
| 105 | if (status <= 0) { |
Steve Pennington | 0541cdf | 2014-12-24 09:33:02 -0600 | [diff] [blame] | 106 | struct timespec64 ts64 = |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 107 | ktime_to_timespec64(fence->timestamp); |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 108 | |
Tapasweni Pathak | 353fdf1 | 2014-10-26 19:20:16 +0530 | [diff] [blame] | 109 | seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 110 | } |
| 111 | |
Gustavo Padovan | 724812d | 2016-05-31 16:59:02 -0300 | [diff] [blame] | 112 | if (fence->ops->timeline_value_str && |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 113 | fence->ops->fence_value_str) { |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 114 | char value[64]; |
Maarten Lankhorst | 73465f1 | 2015-12-11 13:11:49 +0000 | [diff] [blame] | 115 | bool success; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 116 | |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 117 | fence->ops->fence_value_str(fence, value, sizeof(value)); |
Maarten Lankhorst | 73465f1 | 2015-12-11 13:11:49 +0000 | [diff] [blame] | 118 | success = strlen(value); |
| 119 | |
Gustavo Padovan | 724812d | 2016-05-31 16:59:02 -0300 | [diff] [blame] | 120 | if (success) { |
Maarten Lankhorst | 73465f1 | 2015-12-11 13:11:49 +0000 | [diff] [blame] | 121 | seq_printf(s, ": %s", value); |
| 122 | |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 123 | fence->ops->timeline_value_str(fence, value, |
| 124 | sizeof(value)); |
Maarten Lankhorst | 73465f1 | 2015-12-11 13:11:49 +0000 | [diff] [blame] | 125 | |
| 126 | if (strlen(value)) |
| 127 | seq_printf(s, " / %s", value); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 128 | } |
| 129 | } |
| 130 | |
| 131 | seq_puts(s, "\n"); |
| 132 | } |
| 133 | |
| 134 | static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) |
| 135 | { |
| 136 | struct list_head *pos; |
| 137 | unsigned long flags; |
| 138 | |
Gustavo Padovan | ef30afe | 2016-05-31 16:58:58 -0300 | [diff] [blame] | 139 | seq_printf(s, "%s %s: %d\n", obj->name, obj->drv_name, obj->value); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 140 | |
| 141 | spin_lock_irqsave(&obj->child_list_lock, flags); |
| 142 | list_for_each(pos, &obj->child_list_head) { |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 143 | struct fence *fence = |
| 144 | container_of(pos, struct fence, child_list); |
| 145 | sync_print_fence(s, fence, false); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 146 | } |
| 147 | spin_unlock_irqrestore(&obj->child_list_lock, flags); |
| 148 | } |
| 149 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 150 | static void sync_print_sync_file(struct seq_file *s, |
| 151 | struct sync_file *sync_file) |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 152 | { |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 153 | int i; |
| 154 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 155 | seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name, |
| 156 | sync_status_str(atomic_read(&sync_file->status))); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 157 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 158 | for (i = 0; i < sync_file->num_fences; ++i) |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 159 | sync_print_fence(s, sync_file->cbs[i].fence, true); |
| 160 | } |
| 161 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 162 | static int sync_debugfs_show(struct seq_file *s, void *unused) |
| 163 | { |
| 164 | unsigned long flags; |
| 165 | struct list_head *pos; |
| 166 | |
| 167 | seq_puts(s, "objs:\n--------------\n"); |
| 168 | |
| 169 | spin_lock_irqsave(&sync_timeline_list_lock, flags); |
| 170 | list_for_each(pos, &sync_timeline_list_head) { |
| 171 | struct sync_timeline *obj = |
| 172 | container_of(pos, struct sync_timeline, |
| 173 | sync_timeline_list); |
| 174 | |
| 175 | sync_print_obj(s, obj); |
| 176 | seq_puts(s, "\n"); |
| 177 | } |
| 178 | spin_unlock_irqrestore(&sync_timeline_list_lock, flags); |
| 179 | |
| 180 | seq_puts(s, "fences:\n--------------\n"); |
| 181 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 182 | spin_lock_irqsave(&sync_file_list_lock, flags); |
| 183 | list_for_each(pos, &sync_file_list_head) { |
| 184 | struct sync_file *sync_file = |
| 185 | container_of(pos, struct sync_file, sync_file_list); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 186 | |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 187 | sync_print_sync_file(s, sync_file); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 188 | seq_puts(s, "\n"); |
| 189 | } |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 190 | spin_unlock_irqrestore(&sync_file_list_lock, flags); |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
Gustavo Padovan | 8a00448 | 2016-01-21 10:49:17 -0200 | [diff] [blame] | 194 | static int sync_info_debugfs_open(struct inode *inode, struct file *file) |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 195 | { |
| 196 | return single_open(file, sync_debugfs_show, inode->i_private); |
| 197 | } |
| 198 | |
Gustavo Padovan | 8a00448 | 2016-01-21 10:49:17 -0200 | [diff] [blame] | 199 | static const struct file_operations sync_info_debugfs_fops = { |
| 200 | .open = sync_info_debugfs_open, |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 201 | .read = seq_read, |
| 202 | .llseek = seq_lseek, |
| 203 | .release = single_release, |
| 204 | }; |
| 205 | |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 206 | #if IS_ENABLED(CONFIG_SW_SYNC) |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 207 | /* |
| 208 | * *WARNING* |
| 209 | * |
| 210 | * improper use of this can result in deadlocking kernel drivers from userspace. |
| 211 | */ |
| 212 | |
| 213 | /* opening sw_sync create a new sync obj */ |
| 214 | static int sw_sync_debugfs_open(struct inode *inode, struct file *file) |
| 215 | { |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 216 | struct sync_timeline *obj; |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 217 | char task_comm[TASK_COMM_LEN]; |
| 218 | |
| 219 | get_task_comm(task_comm, current); |
| 220 | |
Gustavo Padovan | 62627c8 | 2016-05-31 16:59:03 -0300 | [diff] [blame^] | 221 | obj = sync_timeline_create("sw_sync", task_comm); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 222 | if (!obj) |
| 223 | return -ENOMEM; |
| 224 | |
| 225 | file->private_data = obj; |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static int sw_sync_debugfs_release(struct inode *inode, struct file *file) |
| 231 | { |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 232 | struct sync_timeline *obj = file->private_data; |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 233 | |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 234 | sync_timeline_destroy(obj); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 235 | return 0; |
| 236 | } |
| 237 | |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 238 | static long sw_sync_ioctl_create_fence(struct sync_timeline *obj, |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 239 | unsigned long arg) |
| 240 | { |
| 241 | int fd = get_unused_fd_flags(O_CLOEXEC); |
| 242 | int err; |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 243 | struct fence *fence; |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 244 | struct sync_file *sync_file; |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 245 | struct sw_sync_create_fence_data data; |
| 246 | |
| 247 | if (fd < 0) |
| 248 | return fd; |
| 249 | |
| 250 | if (copy_from_user(&data, (void __user *)arg, sizeof(data))) { |
| 251 | err = -EFAULT; |
| 252 | goto err; |
| 253 | } |
| 254 | |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 255 | fence = sync_pt_create(obj, sizeof(*fence), data.value); |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 256 | if (!fence) { |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 257 | err = -ENOMEM; |
| 258 | goto err; |
| 259 | } |
| 260 | |
Gustavo Padovan | d7c3110 | 2016-04-28 10:46:53 -0300 | [diff] [blame] | 261 | sync_file = sync_file_create(fence); |
Gustavo Padovan | d7fdb0a | 2016-01-21 10:49:19 -0200 | [diff] [blame] | 262 | if (!sync_file) { |
Gustavo Padovan | b55b54b | 2016-01-21 10:49:21 -0200 | [diff] [blame] | 263 | fence_put(fence); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 264 | err = -ENOMEM; |
| 265 | goto err; |
| 266 | } |
| 267 | |
| 268 | data.fence = fd; |
| 269 | if (copy_to_user((void __user *)arg, &data, sizeof(data))) { |
Gustavo Padovan | 2a7c1db | 2016-04-28 10:46:49 -0300 | [diff] [blame] | 270 | fput(sync_file->file); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 271 | err = -EFAULT; |
| 272 | goto err; |
| 273 | } |
| 274 | |
Gustavo Padovan | 2a7c1db | 2016-04-28 10:46:49 -0300 | [diff] [blame] | 275 | fd_install(fd, sync_file->file); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 276 | |
| 277 | return 0; |
| 278 | |
| 279 | err: |
| 280 | put_unused_fd(fd); |
| 281 | return err; |
| 282 | } |
| 283 | |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 284 | static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg) |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 285 | { |
| 286 | u32 value; |
| 287 | |
| 288 | if (copy_from_user(&value, (void __user *)arg, sizeof(value))) |
| 289 | return -EFAULT; |
| 290 | |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 291 | sync_timeline_signal(obj, value); |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static long sw_sync_ioctl(struct file *file, unsigned int cmd, |
| 297 | unsigned long arg) |
| 298 | { |
Gustavo Padovan | dcc2808 | 2016-05-31 16:58:59 -0300 | [diff] [blame] | 299 | struct sync_timeline *obj = file->private_data; |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 300 | |
| 301 | switch (cmd) { |
| 302 | case SW_SYNC_IOC_CREATE_FENCE: |
| 303 | return sw_sync_ioctl_create_fence(obj, arg); |
| 304 | |
| 305 | case SW_SYNC_IOC_INC: |
| 306 | return sw_sync_ioctl_inc(obj, arg); |
| 307 | |
| 308 | default: |
| 309 | return -ENOTTY; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | static const struct file_operations sw_sync_debugfs_fops = { |
| 314 | .open = sw_sync_debugfs_open, |
| 315 | .release = sw_sync_debugfs_release, |
| 316 | .unlocked_ioctl = sw_sync_ioctl, |
| 317 | .compat_ioctl = sw_sync_ioctl, |
| 318 | }; |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 319 | #endif |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 320 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 321 | static __init int sync_debugfs_init(void) |
| 322 | { |
Gustavo Padovan | 8a00448 | 2016-01-21 10:49:17 -0200 | [diff] [blame] | 323 | dbgfs = debugfs_create_dir("sync", NULL); |
| 324 | |
| 325 | debugfs_create_file("info", 0444, dbgfs, NULL, &sync_info_debugfs_fops); |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 326 | |
| 327 | #if IS_ENABLED(CONFIG_SW_SYNC) |
Gustavo Padovan | a44eb74 | 2016-01-21 10:49:18 -0200 | [diff] [blame] | 328 | debugfs_create_file("sw_sync", 0644, dbgfs, NULL, |
| 329 | &sw_sync_debugfs_fops); |
Gustavo Padovan | d21858f | 2016-05-31 16:59:00 -0300 | [diff] [blame] | 330 | #endif |
Gustavo Padovan | 8a00448 | 2016-01-21 10:49:17 -0200 | [diff] [blame] | 331 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 332 | return 0; |
| 333 | } |
| 334 | late_initcall(sync_debugfs_init); |
| 335 | |
| 336 | #define DUMP_CHUNK 256 |
| 337 | static char sync_dump_buf[64 * 1024]; |
| 338 | void sync_dump(void) |
| 339 | { |
| 340 | struct seq_file s = { |
| 341 | .buf = sync_dump_buf, |
| 342 | .size = sizeof(sync_dump_buf) - 1, |
| 343 | }; |
| 344 | int i; |
| 345 | |
| 346 | sync_debugfs_show(&s, NULL); |
| 347 | |
| 348 | for (i = 0; i < s.count; i += DUMP_CHUNK) { |
| 349 | if ((s.count - i) > DUMP_CHUNK) { |
| 350 | char c = s.buf[i + DUMP_CHUNK]; |
Peter Senna Tschudin | 9545135 | 2014-07-12 21:55:56 +0200 | [diff] [blame] | 351 | |
Maarten Lankhorst | 0f0d840 | 2014-07-01 12:57:31 +0200 | [diff] [blame] | 352 | s.buf[i + DUMP_CHUNK] = 0; |
| 353 | pr_cont("%s", s.buf + i); |
| 354 | s.buf[i + DUMP_CHUNK] = c; |
| 355 | } else { |
| 356 | s.buf[s.count] = 0; |
| 357 | pr_cont("%s", s.buf + i); |
| 358 | } |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | #endif |