Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * kernel/power/disk.c - Suspend-to-disk support. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2004 Pavel Machek <pavel@suse.cz> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/suspend.h> | |
13 | #include <linux/syscalls.h> | |
14 | #include <linux/reboot.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/fs.h> | |
d53d9f16 | 19 | #include <linux/mount.h> |
88d10bba | 20 | #include <linux/pm.h> |
97c7801c | 21 | #include <linux/console.h> |
e3920fb4 | 22 | #include <linux/cpu.h> |
7dfb7103 | 23 | #include <linux/freezer.h> |
d53d9f16 | 24 | |
1da177e4 LT |
25 | #include "power.h" |
26 | ||
27 | ||
1da177e4 LT |
28 | static int noresume = 0; |
29 | char resume_file[256] = CONFIG_PM_STD_PARTITION; | |
30 | dev_t swsusp_resume_device; | |
9a154d9d | 31 | sector_t swsusp_resume_block; |
1da177e4 | 32 | |
a3d25c27 RW |
33 | enum { |
34 | HIBERNATION_INVALID, | |
35 | HIBERNATION_PLATFORM, | |
36 | HIBERNATION_TEST, | |
37 | HIBERNATION_TESTPROC, | |
38 | HIBERNATION_SHUTDOWN, | |
39 | HIBERNATION_REBOOT, | |
40 | /* keep last */ | |
41 | __HIBERNATION_AFTER_LAST | |
42 | }; | |
43 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
44 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
45 | ||
46 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
47 | ||
7777fab9 | 48 | static struct hibernation_ops *hibernation_ops; |
a3d25c27 RW |
49 | |
50 | /** | |
51 | * hibernation_set_ops - set the global hibernate operations | |
52 | * @ops: the hibernation operations to use in subsequent hibernation transitions | |
53 | */ | |
54 | ||
55 | void hibernation_set_ops(struct hibernation_ops *ops) | |
56 | { | |
a634cc10 RW |
57 | if (ops && !(ops->prepare && ops->enter && ops->finish |
58 | && ops->pre_restore && ops->restore_cleanup)) { | |
a3d25c27 RW |
59 | WARN_ON(1); |
60 | return; | |
61 | } | |
62 | mutex_lock(&pm_mutex); | |
63 | hibernation_ops = ops; | |
64 | if (ops) | |
65 | hibernation_mode = HIBERNATION_PLATFORM; | |
66 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
67 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
68 | ||
69 | mutex_unlock(&pm_mutex); | |
70 | } | |
71 | ||
72 | ||
8a05aac2 SS |
73 | /** |
74 | * platform_prepare - prepare the machine for hibernation using the | |
75 | * platform driver if so configured and return an error code if it fails | |
76 | */ | |
77 | ||
7777fab9 | 78 | static int platform_prepare(int platform_mode) |
8a05aac2 | 79 | { |
7777fab9 | 80 | return (platform_mode && hibernation_ops) ? |
a3d25c27 RW |
81 | hibernation_ops->prepare() : 0; |
82 | } | |
8a05aac2 | 83 | |
a3d25c27 RW |
84 | /** |
85 | * platform_finish - switch the machine to the normal mode of operation | |
86 | * using the platform driver (must be called after platform_prepare()) | |
87 | */ | |
88 | ||
7777fab9 | 89 | static void platform_finish(int platform_mode) |
a3d25c27 | 90 | { |
7777fab9 | 91 | if (platform_mode && hibernation_ops) |
a3d25c27 | 92 | hibernation_ops->finish(); |
8a05aac2 SS |
93 | } |
94 | ||
a634cc10 RW |
95 | /** |
96 | * platform_pre_restore - prepare the platform for the restoration from a | |
97 | * hibernation image. If the restore fails after this function has been | |
98 | * called, platform_restore_cleanup() must be called. | |
99 | */ | |
100 | ||
101 | static int platform_pre_restore(int platform_mode) | |
102 | { | |
103 | return (platform_mode && hibernation_ops) ? | |
104 | hibernation_ops->pre_restore() : 0; | |
105 | } | |
106 | ||
107 | /** | |
108 | * platform_restore_cleanup - switch the platform to the normal mode of | |
109 | * operation after a failing restore. If platform_pre_restore() has been | |
110 | * called before the failing restore, this function must be called too, | |
111 | * regardless of the result of platform_pre_restore(). | |
112 | */ | |
113 | ||
114 | static void platform_restore_cleanup(int platform_mode) | |
115 | { | |
116 | if (platform_mode && hibernation_ops) | |
117 | hibernation_ops->restore_cleanup(); | |
118 | } | |
119 | ||
7777fab9 RW |
120 | /** |
121 | * hibernation_snapshot - quiesce devices and create the hibernation | |
122 | * snapshot image. | |
123 | * @platform_mode - if set, use the platform driver, if available, to | |
124 | * prepare the platform frimware for the power transition. | |
125 | * | |
126 | * Must be called with pm_mutex held | |
127 | */ | |
128 | ||
129 | int hibernation_snapshot(int platform_mode) | |
130 | { | |
131 | int error; | |
132 | ||
133 | /* Free memory before shutting down devices. */ | |
134 | error = swsusp_shrink_memory(); | |
135 | if (error) | |
10a1803d | 136 | return error; |
7777fab9 RW |
137 | |
138 | suspend_console(); | |
139 | error = device_suspend(PMSG_FREEZE); | |
10a1803d RW |
140 | if (error) |
141 | goto Resume_console; | |
142 | ||
143 | error = platform_prepare(platform_mode); | |
7777fab9 RW |
144 | if (error) |
145 | goto Resume_devices; | |
146 | ||
147 | error = disable_nonboot_cpus(); | |
148 | if (!error) { | |
149 | if (hibernation_mode != HIBERNATION_TEST) { | |
150 | in_suspend = 1; | |
151 | error = swsusp_suspend(); | |
152 | /* Control returns here after successful restore */ | |
153 | } else { | |
154 | printk("swsusp debug: Waiting for 5 seconds.\n"); | |
155 | mdelay(5000); | |
156 | } | |
157 | } | |
158 | enable_nonboot_cpus(); | |
159 | Resume_devices: | |
160 | platform_finish(platform_mode); | |
161 | device_resume(); | |
10a1803d | 162 | Resume_console: |
7777fab9 | 163 | resume_console(); |
7777fab9 RW |
164 | return error; |
165 | } | |
166 | ||
167 | /** | |
168 | * hibernation_restore - quiesce devices and restore the hibernation | |
169 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
170 | * @platform_mode - if set, use the platform driver, if available, to |
171 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
172 | * |
173 | * Must be called with pm_mutex held | |
174 | */ | |
175 | ||
a634cc10 | 176 | int hibernation_restore(int platform_mode) |
7777fab9 RW |
177 | { |
178 | int error; | |
179 | ||
180 | pm_prepare_console(); | |
181 | suspend_console(); | |
182 | error = device_suspend(PMSG_PRETHAW); | |
183 | if (error) | |
184 | goto Finish; | |
185 | ||
a634cc10 RW |
186 | error = platform_pre_restore(platform_mode); |
187 | if (!error) { | |
188 | error = disable_nonboot_cpus(); | |
189 | if (!error) | |
190 | error = swsusp_resume(); | |
191 | enable_nonboot_cpus(); | |
192 | } | |
193 | platform_restore_cleanup(platform_mode); | |
7777fab9 | 194 | device_resume(); |
10a1803d | 195 | Finish: |
7777fab9 RW |
196 | resume_console(); |
197 | pm_restore_console(); | |
198 | return error; | |
199 | } | |
200 | ||
201 | /** | |
202 | * hibernation_platform_enter - enter the hibernation state using the | |
203 | * platform driver (if available) | |
204 | */ | |
205 | ||
206 | int hibernation_platform_enter(void) | |
207 | { | |
b1457bcc RW |
208 | int error; |
209 | ||
7777fab9 RW |
210 | if (hibernation_ops) { |
211 | kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); | |
b1457bcc RW |
212 | /* |
213 | * We have cancelled the power transition by running | |
214 | * hibernation_ops->finish() before saving the image, so we | |
215 | * should let the firmware know that we're going to enter the | |
216 | * sleep state after all | |
217 | */ | |
218 | error = hibernation_ops->prepare(); | |
58b3b71d | 219 | sysdev_shutdown(); |
b1457bcc RW |
220 | if (!error) |
221 | error = hibernation_ops->enter(); | |
7777fab9 | 222 | } else { |
b1457bcc | 223 | error = -ENOSYS; |
7777fab9 | 224 | } |
b1457bcc | 225 | return error; |
7777fab9 RW |
226 | } |
227 | ||
1da177e4 | 228 | /** |
a3d25c27 | 229 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 230 | * |
fe0c935a JB |
231 | * Use the platform driver, if configured so; otherwise try |
232 | * to power off or reboot. | |
1da177e4 LT |
233 | */ |
234 | ||
fe0c935a | 235 | static void power_down(void) |
1da177e4 | 236 | { |
a3d25c27 RW |
237 | switch (hibernation_mode) { |
238 | case HIBERNATION_TEST: | |
239 | case HIBERNATION_TESTPROC: | |
fe0c935a | 240 | break; |
a3d25c27 | 241 | case HIBERNATION_SHUTDOWN: |
fdde86ac | 242 | kernel_power_off(); |
1da177e4 | 243 | break; |
a3d25c27 | 244 | case HIBERNATION_REBOOT: |
fdde86ac | 245 | kernel_restart(NULL); |
1da177e4 | 246 | break; |
a3d25c27 | 247 | case HIBERNATION_PLATFORM: |
7777fab9 | 248 | hibernation_platform_enter(); |
1da177e4 | 249 | } |
fdde86ac | 250 | kernel_halt(); |
fe0c935a JB |
251 | /* |
252 | * Valid image is on the disk, if we continue we risk serious data | |
253 | * corruption after resume. | |
254 | */ | |
1da177e4 LT |
255 | printk(KERN_CRIT "Please power me down manually\n"); |
256 | while(1); | |
257 | } | |
258 | ||
ed746e3b RW |
259 | static void unprepare_processes(void) |
260 | { | |
261 | thaw_processes(); | |
262 | pm_restore_console(); | |
263 | } | |
264 | ||
1da177e4 LT |
265 | static int prepare_processes(void) |
266 | { | |
b918f6e6 | 267 | int error = 0; |
1da177e4 LT |
268 | |
269 | pm_prepare_console(); | |
1da177e4 LT |
270 | if (freeze_processes()) { |
271 | error = -EBUSY; | |
ed746e3b | 272 | unprepare_processes(); |
1da177e4 | 273 | } |
5a72e04d | 274 | return error; |
1da177e4 LT |
275 | } |
276 | ||
1da177e4 | 277 | /** |
a3d25c27 | 278 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
279 | */ |
280 | ||
a3d25c27 | 281 | int hibernate(void) |
1da177e4 LT |
282 | { |
283 | int error; | |
284 | ||
b10d9117 | 285 | mutex_lock(&pm_mutex); |
0709db60 | 286 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
287 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
288 | error = -EBUSY; | |
289 | goto Unlock; | |
290 | } | |
291 | ||
292 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); | |
293 | if (error) | |
294 | goto Exit; | |
0709db60 RW |
295 | |
296 | /* Allocate memory management structures */ | |
297 | error = create_basic_memory_bitmaps(); | |
298 | if (error) | |
299 | goto Exit; | |
300 | ||
1da177e4 | 301 | error = prepare_processes(); |
5a72e04d | 302 | if (error) |
0709db60 | 303 | goto Finish; |
1da177e4 | 304 | |
a3d25c27 | 305 | if (hibernation_mode == HIBERNATION_TESTPROC) { |
ed746e3b RW |
306 | printk("swsusp debug: Waiting for 5 seconds.\n"); |
307 | mdelay(5000); | |
308 | goto Thaw; | |
309 | } | |
7777fab9 RW |
310 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
311 | if (in_suspend && !error) { | |
a634cc10 RW |
312 | unsigned int flags = 0; |
313 | ||
314 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
315 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 316 | pr_debug("PM: writing image.\n"); |
a634cc10 | 317 | error = swsusp_write(flags); |
7777fab9 | 318 | swsusp_free(); |
1da177e4 | 319 | if (!error) |
fe0c935a | 320 | power_down(); |
b918f6e6 | 321 | } else { |
1da177e4 | 322 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 323 | swsusp_free(); |
b918f6e6 | 324 | } |
b918f6e6 | 325 | Thaw: |
99dc7d63 | 326 | unprepare_processes(); |
0709db60 RW |
327 | Finish: |
328 | free_basic_memory_bitmaps(); | |
329 | Exit: | |
b10d9117 | 330 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
0709db60 | 331 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
332 | Unlock: |
333 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
334 | return error; |
335 | } | |
336 | ||
337 | ||
338 | /** | |
339 | * software_resume - Resume from a saved image. | |
340 | * | |
341 | * Called as a late_initcall (so all devices are discovered and | |
342 | * initialized), we call swsusp to see if we have a saved image or not. | |
343 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 344 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
345 | * Otherwise, we fail gracefully and return to the normally |
346 | * scheduled program. | |
347 | * | |
348 | */ | |
349 | ||
350 | static int software_resume(void) | |
351 | { | |
352 | int error; | |
a634cc10 | 353 | unsigned int flags; |
1da177e4 | 354 | |
a6d70980 | 355 | mutex_lock(&pm_mutex); |
3efa147a | 356 | if (!swsusp_resume_device) { |
dd5d666b | 357 | if (!strlen(resume_file)) { |
a6d70980 | 358 | mutex_unlock(&pm_mutex); |
3efa147a | 359 | return -ENOENT; |
dd5d666b | 360 | } |
3efa147a PM |
361 | swsusp_resume_device = name_to_dev_t(resume_file); |
362 | pr_debug("swsusp: Resume From Partition %s\n", resume_file); | |
363 | } else { | |
364 | pr_debug("swsusp: Resume From Partition %d:%d\n", | |
365 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
366 | } | |
367 | ||
1da177e4 LT |
368 | if (noresume) { |
369 | /** | |
370 | * FIXME: If noresume is specified, we need to find the partition | |
371 | * and reset it back to normal swap space. | |
372 | */ | |
a6d70980 | 373 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | ||
377 | pr_debug("PM: Checking swsusp image.\n"); | |
ed746e3b RW |
378 | error = swsusp_check(); |
379 | if (error) | |
74dfd666 | 380 | goto Unlock; |
1da177e4 | 381 | |
0709db60 RW |
382 | /* The snapshot device should not be opened while we're running */ |
383 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
384 | error = -EBUSY; | |
385 | goto Unlock; | |
386 | } | |
387 | ||
74dfd666 RW |
388 | error = create_basic_memory_bitmaps(); |
389 | if (error) | |
0709db60 | 390 | goto Finish; |
1da177e4 | 391 | |
74dfd666 | 392 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
393 | error = prepare_processes(); |
394 | if (error) { | |
1da177e4 | 395 | swsusp_close(); |
5a72e04d | 396 | goto Done; |
1da177e4 LT |
397 | } |
398 | ||
399 | pr_debug("PM: Reading swsusp image.\n"); | |
400 | ||
a634cc10 | 401 | error = swsusp_read(&flags); |
ed746e3b | 402 | if (!error) |
a634cc10 | 403 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 404 | |
ed746e3b | 405 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 406 | swsusp_free(); |
1da177e4 LT |
407 | unprepare_processes(); |
408 | Done: | |
74dfd666 | 409 | free_basic_memory_bitmaps(); |
0709db60 RW |
410 | Finish: |
411 | atomic_inc(&snapshot_device_available); | |
dd5d666b | 412 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 413 | Unlock: |
a6d70980 | 414 | mutex_unlock(&pm_mutex); |
1da177e4 | 415 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 416 | return error; |
1da177e4 LT |
417 | } |
418 | ||
419 | late_initcall(software_resume); | |
420 | ||
421 | ||
a3d25c27 RW |
422 | static const char * const hibernation_modes[] = { |
423 | [HIBERNATION_PLATFORM] = "platform", | |
424 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
425 | [HIBERNATION_REBOOT] = "reboot", | |
426 | [HIBERNATION_TEST] = "test", | |
427 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
428 | }; |
429 | ||
430 | /** | |
a3d25c27 | 431 | * disk - Control hibernation mode |
1da177e4 | 432 | * |
11d77d0c JB |
433 | * Suspend-to-disk can be handled in several ways. We have a few options |
434 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
435 | * or other hibernation_ops), powering off the system or rebooting the |
436 | * system (for testing) as well as the two test modes. | |
1da177e4 | 437 | * |
11d77d0c | 438 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
439 | * encoded by the presence of hibernation_ops). However, the user may |
440 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
441 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
442 | * |
443 | * show() will display what the mode is currently set to. | |
444 | * store() will accept one of | |
445 | * | |
1da177e4 LT |
446 | * 'platform' |
447 | * 'shutdown' | |
448 | * 'reboot' | |
11d77d0c JB |
449 | * 'test' |
450 | * 'testproc' | |
1da177e4 | 451 | * |
11d77d0c | 452 | * It will only change to 'platform' if the system |
a3d25c27 | 453 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
454 | */ |
455 | ||
823bccfc | 456 | static ssize_t disk_show(struct kset *kset, char *buf) |
1da177e4 | 457 | { |
f0ced9b2 JB |
458 | int i; |
459 | char *start = buf; | |
460 | ||
a3d25c27 RW |
461 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
462 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
463 | continue; |
464 | switch (i) { | |
a3d25c27 RW |
465 | case HIBERNATION_SHUTDOWN: |
466 | case HIBERNATION_REBOOT: | |
467 | case HIBERNATION_TEST: | |
468 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 469 | break; |
a3d25c27 RW |
470 | case HIBERNATION_PLATFORM: |
471 | if (hibernation_ops) | |
f0ced9b2 JB |
472 | break; |
473 | /* not a valid mode, continue with loop */ | |
474 | continue; | |
475 | } | |
a3d25c27 RW |
476 | if (i == hibernation_mode) |
477 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 478 | else |
a3d25c27 | 479 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
480 | } |
481 | buf += sprintf(buf, "\n"); | |
482 | return buf-start; | |
1da177e4 LT |
483 | } |
484 | ||
485 | ||
823bccfc | 486 | static ssize_t disk_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 LT |
487 | { |
488 | int error = 0; | |
489 | int i; | |
490 | int len; | |
491 | char *p; | |
a3d25c27 | 492 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
493 | |
494 | p = memchr(buf, '\n', n); | |
495 | len = p ? p - buf : n; | |
496 | ||
a6d70980 | 497 | mutex_lock(&pm_mutex); |
a3d25c27 | 498 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
499 | if (len == strlen(hibernation_modes[i]) |
500 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
501 | mode = i; |
502 | break; | |
503 | } | |
504 | } | |
a3d25c27 | 505 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 506 | switch (mode) { |
a3d25c27 RW |
507 | case HIBERNATION_SHUTDOWN: |
508 | case HIBERNATION_REBOOT: | |
509 | case HIBERNATION_TEST: | |
510 | case HIBERNATION_TESTPROC: | |
511 | hibernation_mode = mode; | |
fe0c935a | 512 | break; |
a3d25c27 RW |
513 | case HIBERNATION_PLATFORM: |
514 | if (hibernation_ops) | |
515 | hibernation_mode = mode; | |
1da177e4 LT |
516 | else |
517 | error = -EINVAL; | |
518 | } | |
a3d25c27 | 519 | } else |
1da177e4 LT |
520 | error = -EINVAL; |
521 | ||
a3d25c27 RW |
522 | if (!error) |
523 | pr_debug("PM: suspend-to-disk mode set to '%s'\n", | |
524 | hibernation_modes[mode]); | |
a6d70980 | 525 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
526 | return error ? error : n; |
527 | } | |
528 | ||
529 | power_attr(disk); | |
530 | ||
823bccfc | 531 | static ssize_t resume_show(struct kset *kset, char *buf) |
1da177e4 LT |
532 | { |
533 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
534 | MINOR(swsusp_resume_device)); | |
535 | } | |
536 | ||
823bccfc | 537 | static ssize_t resume_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 | 538 | { |
1da177e4 | 539 | unsigned int maj, min; |
1da177e4 | 540 | dev_t res; |
a576219a | 541 | int ret = -EINVAL; |
1da177e4 | 542 | |
a576219a AM |
543 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
544 | goto out; | |
1da177e4 | 545 | |
a576219a AM |
546 | res = MKDEV(maj,min); |
547 | if (maj != MAJOR(res) || min != MINOR(res)) | |
548 | goto out; | |
1da177e4 | 549 | |
a6d70980 | 550 | mutex_lock(&pm_mutex); |
a576219a | 551 | swsusp_resume_device = res; |
a6d70980 | 552 | mutex_unlock(&pm_mutex); |
a576219a AM |
553 | printk("Attempting manual resume\n"); |
554 | noresume = 0; | |
555 | software_resume(); | |
556 | ret = n; | |
59a49335 | 557 | out: |
a576219a | 558 | return ret; |
1da177e4 LT |
559 | } |
560 | ||
561 | power_attr(resume); | |
562 | ||
823bccfc | 563 | static ssize_t image_size_show(struct kset *kset, char *buf) |
ca0aec0f | 564 | { |
853609b6 | 565 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
566 | } |
567 | ||
823bccfc | 568 | static ssize_t image_size_store(struct kset *kset, const char *buf, size_t n) |
ca0aec0f | 569 | { |
853609b6 | 570 | unsigned long size; |
ca0aec0f | 571 | |
853609b6 | 572 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
573 | image_size = size; |
574 | return n; | |
575 | } | |
576 | ||
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | power_attr(image_size); | |
581 | ||
1da177e4 LT |
582 | static struct attribute * g[] = { |
583 | &disk_attr.attr, | |
584 | &resume_attr.attr, | |
ca0aec0f | 585 | &image_size_attr.attr, |
1da177e4 LT |
586 | NULL, |
587 | }; | |
588 | ||
589 | ||
590 | static struct attribute_group attr_group = { | |
591 | .attrs = g, | |
592 | }; | |
593 | ||
594 | ||
595 | static int __init pm_disk_init(void) | |
596 | { | |
823bccfc | 597 | return sysfs_create_group(&power_subsys.kobj, &attr_group); |
1da177e4 LT |
598 | } |
599 | ||
600 | core_initcall(pm_disk_init); | |
601 | ||
602 | ||
603 | static int __init resume_setup(char *str) | |
604 | { | |
605 | if (noresume) | |
606 | return 1; | |
607 | ||
608 | strncpy( resume_file, str, 255 ); | |
609 | return 1; | |
610 | } | |
611 | ||
9a154d9d RW |
612 | static int __init resume_offset_setup(char *str) |
613 | { | |
614 | unsigned long long offset; | |
615 | ||
616 | if (noresume) | |
617 | return 1; | |
618 | ||
619 | if (sscanf(str, "%llu", &offset) == 1) | |
620 | swsusp_resume_block = offset; | |
621 | ||
622 | return 1; | |
623 | } | |
624 | ||
1da177e4 LT |
625 | static int __init noresume_setup(char *str) |
626 | { | |
627 | noresume = 1; | |
628 | return 1; | |
629 | } | |
630 | ||
631 | __setup("noresume", noresume_setup); | |
9a154d9d | 632 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 633 | __setup("resume=", resume_setup); |