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Commit | Line | Data |
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6e1819d6 RW |
1 | /* |
2 | * linux/kernel/power/user.c | |
3 | * | |
4 | * This file provides the user space interface for software suspend/resume. | |
5 | * | |
6 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/suspend.h> | |
13 | #include <linux/syscalls.h> | |
3592695c | 14 | #include <linux/reboot.h> |
6e1819d6 RW |
15 | #include <linux/string.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/miscdevice.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/swapops.h> | |
21 | #include <linux/pm.h> | |
22 | #include <linux/fs.h> | |
97c7801c | 23 | #include <linux/console.h> |
e3920fb4 | 24 | #include <linux/cpu.h> |
7dfb7103 | 25 | #include <linux/freezer.h> |
c7510859 | 26 | #include <scsi/scsi_scan.h> |
6e1819d6 RW |
27 | |
28 | #include <asm/uaccess.h> | |
29 | ||
30 | #include "power.h" | |
31 | ||
eb57c1cf | 32 | /* |
96f73749 RW |
33 | * NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and |
34 | * will be removed in the future. They are only preserved here for | |
35 | * compatibility with existing userland utilities. | |
eb57c1cf | 36 | */ |
96f73749 | 37 | #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int) |
eb57c1cf RW |
38 | #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) |
39 | ||
40 | #define PMOPS_PREPARE 1 | |
41 | #define PMOPS_ENTER 2 | |
42 | #define PMOPS_FINISH 3 | |
43 | ||
cc5d207c RW |
44 | /* |
45 | * NOTE: The following ioctl definitions are wrong and have been replaced with | |
46 | * correct ones. They are only preserved here for compatibility with existing | |
47 | * userland utilities and will be removed in the future. | |
48 | */ | |
49 | #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *) | |
50 | #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long) | |
51 | #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *) | |
52 | #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *) | |
53 | ||
eb57c1cf | 54 | |
6e1819d6 RW |
55 | #define SNAPSHOT_MINOR 231 |
56 | ||
57 | static struct snapshot_data { | |
58 | struct snapshot_handle handle; | |
59 | int swap; | |
6e1819d6 RW |
60 | int mode; |
61 | char frozen; | |
62 | char ready; | |
eb57c1cf | 63 | char platform_support; |
6e1819d6 RW |
64 | } snapshot_state; |
65 | ||
0709db60 | 66 | atomic_t snapshot_device_available = ATOMIC_INIT(1); |
6e1819d6 RW |
67 | |
68 | static int snapshot_open(struct inode *inode, struct file *filp) | |
69 | { | |
70 | struct snapshot_data *data; | |
c3e94d89 | 71 | int error; |
6e1819d6 | 72 | |
25f2f3da RW |
73 | mutex_lock(&pm_mutex); |
74 | ||
75 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
76 | error = -EBUSY; | |
77 | goto Unlock; | |
78 | } | |
6e1819d6 | 79 | |
1525a2ad | 80 | if ((filp->f_flags & O_ACCMODE) == O_RDWR) { |
0709db60 | 81 | atomic_inc(&snapshot_device_available); |
25f2f3da RW |
82 | error = -ENOSYS; |
83 | goto Unlock; | |
1525a2ad RW |
84 | } |
85 | if(create_basic_memory_bitmaps()) { | |
0709db60 | 86 | atomic_inc(&snapshot_device_available); |
25f2f3da RW |
87 | error = -ENOMEM; |
88 | goto Unlock; | |
1525a2ad | 89 | } |
6e1819d6 RW |
90 | nonseekable_open(inode, filp); |
91 | data = &snapshot_state; | |
92 | filp->private_data = data; | |
93 | memset(&data->handle, 0, sizeof(struct snapshot_handle)); | |
94 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) { | |
c7510859 | 95 | /* Hibernating. The image device should be accessible. */ |
915bae9e | 96 | data->swap = swsusp_resume_device ? |
7bf23687 | 97 | swap_type_of(swsusp_resume_device, 0, NULL) : -1; |
6e1819d6 | 98 | data->mode = O_RDONLY; |
ebae2604 | 99 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
c3e94d89 | 100 | if (error) |
ebae2604 | 101 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
6e1819d6 | 102 | } else { |
c7510859 RW |
103 | /* |
104 | * Resuming. We may need to wait for the image device to | |
105 | * appear. | |
106 | */ | |
107 | wait_for_device_probe(); | |
108 | scsi_complete_async_scans(); | |
109 | ||
6e1819d6 RW |
110 | data->swap = -1; |
111 | data->mode = O_WRONLY; | |
ebae2604 | 112 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
c3e94d89 | 113 | if (error) |
ebae2604 | 114 | pm_notifier_call_chain(PM_POST_RESTORE); |
c3e94d89 | 115 | } |
25f2f3da | 116 | if (error) |
c3e94d89 | 117 | atomic_inc(&snapshot_device_available); |
6e1819d6 RW |
118 | data->frozen = 0; |
119 | data->ready = 0; | |
eb57c1cf | 120 | data->platform_support = 0; |
6e1819d6 | 121 | |
25f2f3da RW |
122 | Unlock: |
123 | mutex_unlock(&pm_mutex); | |
124 | ||
125 | return error; | |
6e1819d6 RW |
126 | } |
127 | ||
128 | static int snapshot_release(struct inode *inode, struct file *filp) | |
129 | { | |
130 | struct snapshot_data *data; | |
131 | ||
25f2f3da RW |
132 | mutex_lock(&pm_mutex); |
133 | ||
6e1819d6 | 134 | swsusp_free(); |
74dfd666 | 135 | free_basic_memory_bitmaps(); |
6e1819d6 | 136 | data = filp->private_data; |
d1d241cc | 137 | free_all_swap_pages(data->swap); |
25f2f3da | 138 | if (data->frozen) |
6e1819d6 | 139 | thaw_processes(); |
c3e94d89 AS |
140 | pm_notifier_call_chain(data->mode == O_WRONLY ? |
141 | PM_POST_HIBERNATION : PM_POST_RESTORE); | |
0709db60 | 142 | atomic_inc(&snapshot_device_available); |
25f2f3da RW |
143 | |
144 | mutex_unlock(&pm_mutex); | |
145 | ||
6e1819d6 RW |
146 | return 0; |
147 | } | |
148 | ||
149 | static ssize_t snapshot_read(struct file *filp, char __user *buf, | |
150 | size_t count, loff_t *offp) | |
151 | { | |
152 | struct snapshot_data *data; | |
153 | ssize_t res; | |
154 | ||
25f2f3da RW |
155 | mutex_lock(&pm_mutex); |
156 | ||
6e1819d6 | 157 | data = filp->private_data; |
25f2f3da RW |
158 | if (!data->ready) { |
159 | res = -ENODATA; | |
160 | goto Unlock; | |
161 | } | |
6e1819d6 RW |
162 | res = snapshot_read_next(&data->handle, count); |
163 | if (res > 0) { | |
164 | if (copy_to_user(buf, data_of(data->handle), res)) | |
165 | res = -EFAULT; | |
166 | else | |
167 | *offp = data->handle.offset; | |
168 | } | |
25f2f3da RW |
169 | |
170 | Unlock: | |
171 | mutex_unlock(&pm_mutex); | |
172 | ||
6e1819d6 RW |
173 | return res; |
174 | } | |
175 | ||
176 | static ssize_t snapshot_write(struct file *filp, const char __user *buf, | |
177 | size_t count, loff_t *offp) | |
178 | { | |
179 | struct snapshot_data *data; | |
180 | ssize_t res; | |
181 | ||
25f2f3da RW |
182 | mutex_lock(&pm_mutex); |
183 | ||
6e1819d6 RW |
184 | data = filp->private_data; |
185 | res = snapshot_write_next(&data->handle, count); | |
186 | if (res > 0) { | |
187 | if (copy_from_user(data_of(data->handle), buf, res)) | |
188 | res = -EFAULT; | |
189 | else | |
190 | *offp = data->handle.offset; | |
191 | } | |
25f2f3da RW |
192 | |
193 | mutex_unlock(&pm_mutex); | |
194 | ||
6e1819d6 RW |
195 | return res; |
196 | } | |
197 | ||
52d11025 AC |
198 | static long snapshot_ioctl(struct file *filp, unsigned int cmd, |
199 | unsigned long arg) | |
6e1819d6 RW |
200 | { |
201 | int error = 0; | |
202 | struct snapshot_data *data; | |
af508b34 | 203 | loff_t size; |
3aef83e0 | 204 | sector_t offset; |
6e1819d6 RW |
205 | |
206 | if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC) | |
207 | return -ENOTTY; | |
208 | if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR) | |
209 | return -ENOTTY; | |
210 | if (!capable(CAP_SYS_ADMIN)) | |
211 | return -EPERM; | |
212 | ||
25f2f3da RW |
213 | if (!mutex_trylock(&pm_mutex)) |
214 | return -EBUSY; | |
6e1819d6 | 215 | |
25f2f3da | 216 | data = filp->private_data; |
52d11025 | 217 | |
6e1819d6 RW |
218 | switch (cmd) { |
219 | ||
220 | case SNAPSHOT_FREEZE: | |
221 | if (data->frozen) | |
222 | break; | |
1bfcf130 | 223 | |
c3e94d89 AS |
224 | printk("Syncing filesystems ... "); |
225 | sys_sync(); | |
226 | printk("done.\n"); | |
227 | ||
1bfcf130 | 228 | error = usermodehelper_disable(); |
b10d9117 | 229 | if (error) |
1bfcf130 RW |
230 | break; |
231 | ||
232 | error = freeze_processes(); | |
233 | if (error) { | |
c3e94d89 | 234 | thaw_processes(); |
1bfcf130 RW |
235 | usermodehelper_enable(); |
236 | } | |
6e1819d6 RW |
237 | if (!error) |
238 | data->frozen = 1; | |
239 | break; | |
240 | ||
241 | case SNAPSHOT_UNFREEZE: | |
2f41dddb | 242 | if (!data->frozen || data->ready) |
6e1819d6 | 243 | break; |
6e1819d6 | 244 | thaw_processes(); |
1bfcf130 | 245 | usermodehelper_enable(); |
6e1819d6 RW |
246 | data->frozen = 0; |
247 | break; | |
248 | ||
cc5d207c | 249 | case SNAPSHOT_CREATE_IMAGE: |
6e1819d6 RW |
250 | case SNAPSHOT_ATOMIC_SNAPSHOT: |
251 | if (data->mode != O_RDONLY || !data->frozen || data->ready) { | |
252 | error = -EPERM; | |
253 | break; | |
254 | } | |
eb57c1cf | 255 | error = hibernation_snapshot(data->platform_support); |
6e1819d6 | 256 | if (!error) |
cc5d207c | 257 | error = put_user(in_suspend, (int __user *)arg); |
6e1819d6 RW |
258 | if (!error) |
259 | data->ready = 1; | |
260 | break; | |
261 | ||
262 | case SNAPSHOT_ATOMIC_RESTORE: | |
8357376d | 263 | snapshot_write_finalize(&data->handle); |
6e1819d6 RW |
264 | if (data->mode != O_WRONLY || !data->frozen || |
265 | !snapshot_image_loaded(&data->handle)) { | |
266 | error = -EPERM; | |
267 | break; | |
268 | } | |
eb57c1cf | 269 | error = hibernation_restore(data->platform_support); |
6e1819d6 RW |
270 | break; |
271 | ||
272 | case SNAPSHOT_FREE: | |
273 | swsusp_free(); | |
274 | memset(&data->handle, 0, sizeof(struct snapshot_handle)); | |
275 | data->ready = 0; | |
276 | break; | |
277 | ||
cc5d207c | 278 | case SNAPSHOT_PREF_IMAGE_SIZE: |
6e1819d6 RW |
279 | case SNAPSHOT_SET_IMAGE_SIZE: |
280 | image_size = arg; | |
281 | break; | |
282 | ||
af508b34 RW |
283 | case SNAPSHOT_GET_IMAGE_SIZE: |
284 | if (!data->ready) { | |
285 | error = -ENODATA; | |
286 | break; | |
287 | } | |
288 | size = snapshot_get_image_size(); | |
289 | size <<= PAGE_SHIFT; | |
290 | error = put_user(size, (loff_t __user *)arg); | |
291 | break; | |
292 | ||
cc5d207c | 293 | case SNAPSHOT_AVAIL_SWAP_SIZE: |
6e1819d6 | 294 | case SNAPSHOT_AVAIL_SWAP: |
af508b34 RW |
295 | size = count_swap_pages(data->swap, 1); |
296 | size <<= PAGE_SHIFT; | |
297 | error = put_user(size, (loff_t __user *)arg); | |
6e1819d6 RW |
298 | break; |
299 | ||
cc5d207c | 300 | case SNAPSHOT_ALLOC_SWAP_PAGE: |
6e1819d6 RW |
301 | case SNAPSHOT_GET_SWAP_PAGE: |
302 | if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { | |
303 | error = -ENODEV; | |
304 | break; | |
305 | } | |
d1d241cc | 306 | offset = alloc_swapdev_block(data->swap); |
6e1819d6 RW |
307 | if (offset) { |
308 | offset <<= PAGE_SHIFT; | |
cc5d207c | 309 | error = put_user(offset, (loff_t __user *)arg); |
6e1819d6 RW |
310 | } else { |
311 | error = -ENOSPC; | |
312 | } | |
313 | break; | |
314 | ||
315 | case SNAPSHOT_FREE_SWAP_PAGES: | |
316 | if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { | |
317 | error = -ENODEV; | |
318 | break; | |
319 | } | |
d1d241cc | 320 | free_all_swap_pages(data->swap); |
6e1819d6 RW |
321 | break; |
322 | ||
96f73749 | 323 | case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */ |
d1d241cc | 324 | if (!swsusp_swap_in_use()) { |
6e1819d6 RW |
325 | /* |
326 | * User space encodes device types as two-byte values, | |
327 | * so we need to recode them | |
328 | */ | |
329 | if (old_decode_dev(arg)) { | |
7bf23687 RW |
330 | data->swap = swap_type_of(old_decode_dev(arg), |
331 | 0, NULL); | |
6e1819d6 RW |
332 | if (data->swap < 0) |
333 | error = -ENODEV; | |
334 | } else { | |
335 | data->swap = -1; | |
336 | error = -EINVAL; | |
337 | } | |
338 | } else { | |
339 | error = -EPERM; | |
340 | } | |
341 | break; | |
342 | ||
9b238205 LT |
343 | case SNAPSHOT_S2RAM: |
344 | if (!data->frozen) { | |
345 | error = -EPERM; | |
346 | break; | |
347 | } | |
6c961dfb RW |
348 | /* |
349 | * Tasks are frozen and the notifiers have been called with | |
350 | * PM_HIBERNATION_PREPARE | |
351 | */ | |
352 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
9b238205 LT |
353 | break; |
354 | ||
eb57c1cf RW |
355 | case SNAPSHOT_PLATFORM_SUPPORT: |
356 | data->platform_support = !!arg; | |
357 | break; | |
358 | ||
359 | case SNAPSHOT_POWER_OFF: | |
360 | if (data->platform_support) | |
361 | error = hibernation_platform_enter(); | |
362 | break; | |
363 | ||
364 | case SNAPSHOT_PMOPS: /* This ioctl is deprecated */ | |
2b5b09b3 RW |
365 | error = -EINVAL; |
366 | ||
3592695c SS |
367 | switch (arg) { |
368 | ||
369 | case PMOPS_PREPARE: | |
eb57c1cf | 370 | data->platform_support = 1; |
7777fab9 | 371 | error = 0; |
3592695c SS |
372 | break; |
373 | ||
374 | case PMOPS_ENTER: | |
eb57c1cf | 375 | if (data->platform_support) |
7777fab9 | 376 | error = hibernation_platform_enter(); |
3592695c SS |
377 | break; |
378 | ||
379 | case PMOPS_FINISH: | |
eb57c1cf | 380 | if (data->platform_support) |
2b5b09b3 | 381 | error = 0; |
3592695c SS |
382 | break; |
383 | ||
384 | default: | |
385 | printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg); | |
3592695c SS |
386 | |
387 | } | |
388 | break; | |
389 | ||
37b2ba12 | 390 | case SNAPSHOT_SET_SWAP_AREA: |
d1d241cc | 391 | if (swsusp_swap_in_use()) { |
37b2ba12 RW |
392 | error = -EPERM; |
393 | } else { | |
394 | struct resume_swap_area swap_area; | |
395 | dev_t swdev; | |
396 | ||
397 | error = copy_from_user(&swap_area, (void __user *)arg, | |
398 | sizeof(struct resume_swap_area)); | |
399 | if (error) { | |
400 | error = -EFAULT; | |
401 | break; | |
402 | } | |
403 | ||
404 | /* | |
405 | * User space encodes device types as two-byte values, | |
406 | * so we need to recode them | |
407 | */ | |
408 | swdev = old_decode_dev(swap_area.dev); | |
409 | if (swdev) { | |
410 | offset = swap_area.offset; | |
7bf23687 | 411 | data->swap = swap_type_of(swdev, offset, NULL); |
37b2ba12 RW |
412 | if (data->swap < 0) |
413 | error = -ENODEV; | |
414 | } else { | |
415 | data->swap = -1; | |
416 | error = -EINVAL; | |
417 | } | |
418 | } | |
419 | break; | |
420 | ||
6e1819d6 RW |
421 | default: |
422 | error = -ENOTTY; | |
423 | ||
424 | } | |
25f2f3da RW |
425 | |
426 | mutex_unlock(&pm_mutex); | |
427 | ||
6e1819d6 RW |
428 | return error; |
429 | } | |
430 | ||
15ad7cdc | 431 | static const struct file_operations snapshot_fops = { |
6e1819d6 RW |
432 | .open = snapshot_open, |
433 | .release = snapshot_release, | |
434 | .read = snapshot_read, | |
435 | .write = snapshot_write, | |
436 | .llseek = no_llseek, | |
52d11025 | 437 | .unlocked_ioctl = snapshot_ioctl, |
6e1819d6 RW |
438 | }; |
439 | ||
440 | static struct miscdevice snapshot_device = { | |
441 | .minor = SNAPSHOT_MINOR, | |
442 | .name = "snapshot", | |
443 | .fops = &snapshot_fops, | |
444 | }; | |
445 | ||
446 | static int __init snapshot_device_init(void) | |
447 | { | |
448 | return misc_register(&snapshot_device); | |
449 | }; | |
450 | ||
451 | device_initcall(snapshot_device_init); |