Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
8b759b84 | 2 | * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support. |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
a2531293 | 6 | * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz> |
8b759b84 | 7 | * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc. |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2. | |
1da177e4 LT |
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> | |
1bfcf130 | 17 | #include <linux/kmod.h> |
1da177e4 LT |
18 | #include <linux/delay.h> |
19 | #include <linux/fs.h> | |
d53d9f16 | 20 | #include <linux/mount.h> |
88d10bba | 21 | #include <linux/pm.h> |
97c7801c | 22 | #include <linux/console.h> |
e3920fb4 | 23 | #include <linux/cpu.h> |
7dfb7103 | 24 | #include <linux/freezer.h> |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
40dc166c | 26 | #include <linux/syscore_ops.h> |
c7510859 | 27 | #include <scsi/scsi_scan.h> |
d53d9f16 | 28 | |
1da177e4 LT |
29 | #include "power.h" |
30 | ||
31 | ||
f996fc96 | 32 | static int nocompress = 0; |
1da177e4 | 33 | static int noresume = 0; |
47a460d5 | 34 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 35 | dev_t swsusp_resume_device; |
9a154d9d | 36 | sector_t swsusp_resume_block; |
8e60c6a1 | 37 | int in_suspend __nosavedata = 0; |
1da177e4 | 38 | |
a3d25c27 RW |
39 | enum { |
40 | HIBERNATION_INVALID, | |
41 | HIBERNATION_PLATFORM, | |
42 | HIBERNATION_TEST, | |
43 | HIBERNATION_TESTPROC, | |
44 | HIBERNATION_SHUTDOWN, | |
45 | HIBERNATION_REBOOT, | |
46 | /* keep last */ | |
47 | __HIBERNATION_AFTER_LAST | |
48 | }; | |
49 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
50 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
51 | ||
52 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
53 | ||
073ef1f6 | 54 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
55 | |
56 | /** | |
f42a9813 RW |
57 | * hibernation_set_ops - Set the global hibernate operations. |
58 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 59 | */ |
073ef1f6 | 60 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 61 | { |
caea99ef RW |
62 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
63 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 64 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
65 | WARN_ON(1); |
66 | return; | |
67 | } | |
68 | mutex_lock(&pm_mutex); | |
69 | hibernation_ops = ops; | |
70 | if (ops) | |
71 | hibernation_mode = HIBERNATION_PLATFORM; | |
72 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
73 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
74 | ||
75 | mutex_unlock(&pm_mutex); | |
76 | } | |
77 | ||
abfe2d7b RW |
78 | static bool entering_platform_hibernation; |
79 | ||
80 | bool system_entering_hibernation(void) | |
81 | { | |
82 | return entering_platform_hibernation; | |
83 | } | |
84 | EXPORT_SYMBOL(system_entering_hibernation); | |
85 | ||
4cc79776 RW |
86 | #ifdef CONFIG_PM_DEBUG |
87 | static void hibernation_debug_sleep(void) | |
88 | { | |
89 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
90 | mdelay(5000); | |
91 | } | |
92 | ||
93 | static int hibernation_testmode(int mode) | |
94 | { | |
95 | if (hibernation_mode == mode) { | |
96 | hibernation_debug_sleep(); | |
97 | return 1; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int hibernation_test(int level) | |
103 | { | |
104 | if (pm_test_level == level) { | |
105 | hibernation_debug_sleep(); | |
106 | return 1; | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | #else /* !CONFIG_PM_DEBUG */ | |
111 | static int hibernation_testmode(int mode) { return 0; } | |
112 | static int hibernation_test(int level) { return 0; } | |
113 | #endif /* !CONFIG_PM_DEBUG */ | |
114 | ||
74f270af | 115 | /** |
f42a9813 RW |
116 | * platform_begin - Call platform to start hibernation. |
117 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 118 | */ |
caea99ef | 119 | static int platform_begin(int platform_mode) |
74f270af RW |
120 | { |
121 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
122 | hibernation_ops->begin() : 0; |
123 | } | |
124 | ||
125 | /** | |
f42a9813 RW |
126 | * platform_end - Call platform to finish transition to the working state. |
127 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 128 | */ |
caea99ef RW |
129 | static void platform_end(int platform_mode) |
130 | { | |
131 | if (platform_mode && hibernation_ops) | |
132 | hibernation_ops->end(); | |
74f270af | 133 | } |
a3d25c27 | 134 | |
8a05aac2 | 135 | /** |
f42a9813 RW |
136 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
137 | * @platform_mode: Whether or not to use the platform driver. | |
138 | * | |
139 | * Use the platform driver to prepare the system for creating a hibernate image, | |
140 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
141 | */ |
142 | ||
74f270af | 143 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 144 | { |
7777fab9 | 145 | return (platform_mode && hibernation_ops) ? |
74f270af | 146 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 147 | } |
8a05aac2 | 148 | |
c7e0831d | 149 | /** |
f42a9813 RW |
150 | * platform_leave - Call platform to prepare a transition to the working state. |
151 | * @platform_mode: Whether or not to use the platform driver. | |
152 | * | |
153 | * Use the platform driver prepare to prepare the machine for switching to the | |
154 | * normal mode of operation. | |
155 | * | |
156 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 157 | */ |
c7e0831d RW |
158 | static void platform_leave(int platform_mode) |
159 | { | |
160 | if (platform_mode && hibernation_ops) | |
161 | hibernation_ops->leave(); | |
162 | } | |
163 | ||
a3d25c27 | 164 | /** |
f42a9813 RW |
165 | * platform_finish - Call platform to switch the system to the working state. |
166 | * @platform_mode: Whether or not to use the platform driver. | |
167 | * | |
168 | * Use the platform driver to switch the machine to the normal mode of | |
169 | * operation. | |
170 | * | |
171 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 172 | */ |
7777fab9 | 173 | static void platform_finish(int platform_mode) |
a3d25c27 | 174 | { |
7777fab9 | 175 | if (platform_mode && hibernation_ops) |
a3d25c27 | 176 | hibernation_ops->finish(); |
8a05aac2 SS |
177 | } |
178 | ||
a634cc10 | 179 | /** |
f42a9813 RW |
180 | * platform_pre_restore - Prepare for hibernate image restoration. |
181 | * @platform_mode: Whether or not to use the platform driver. | |
182 | * | |
183 | * Use the platform driver to prepare the system for resume from a hibernation | |
184 | * image. | |
185 | * | |
186 | * If the restore fails after this function has been called, | |
187 | * platform_restore_cleanup() must be called. | |
a634cc10 | 188 | */ |
a634cc10 RW |
189 | static int platform_pre_restore(int platform_mode) |
190 | { | |
191 | return (platform_mode && hibernation_ops) ? | |
192 | hibernation_ops->pre_restore() : 0; | |
193 | } | |
194 | ||
195 | /** | |
f42a9813 RW |
196 | * platform_restore_cleanup - Switch to the working state after failing restore. |
197 | * @platform_mode: Whether or not to use the platform driver. | |
198 | * | |
199 | * Use the platform driver to switch the system to the normal mode of operation | |
200 | * after a failing restore. | |
201 | * | |
202 | * If platform_pre_restore() has been called before the failing restore, this | |
203 | * function must be called too, regardless of the result of | |
204 | * platform_pre_restore(). | |
a634cc10 | 205 | */ |
a634cc10 RW |
206 | static void platform_restore_cleanup(int platform_mode) |
207 | { | |
208 | if (platform_mode && hibernation_ops) | |
209 | hibernation_ops->restore_cleanup(); | |
210 | } | |
211 | ||
d8f3de0d | 212 | /** |
f42a9813 RW |
213 | * platform_recover - Recover from a failure to suspend devices. |
214 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 215 | */ |
d8f3de0d RW |
216 | static void platform_recover(int platform_mode) |
217 | { | |
218 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
219 | hibernation_ops->recover(); | |
220 | } | |
221 | ||
8e60c6a1 | 222 | /** |
f42a9813 RW |
223 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
224 | * @start: Starting event. | |
225 | * @stop: Final event. | |
226 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
227 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 228 | */ |
8e60c6a1 NC |
229 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
230 | unsigned nr_pages, char *msg) | |
231 | { | |
232 | s64 elapsed_centisecs64; | |
233 | int centisecs; | |
234 | int k; | |
235 | int kps; | |
236 | ||
237 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
238 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
239 | centisecs = elapsed_centisecs64; | |
240 | if (centisecs == 0) | |
241 | centisecs = 1; /* avoid div-by-zero */ | |
242 | k = nr_pages * (PAGE_SIZE / 1024); | |
243 | kps = (k * 100) / centisecs; | |
244 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
245 | msg, k, | |
246 | centisecs / 100, centisecs % 100, | |
247 | kps / 1000, (kps % 1000) / 10); | |
248 | } | |
249 | ||
c7e0831d | 250 | /** |
f42a9813 RW |
251 | * create_image - Create a hibernation image. |
252 | * @platform_mode: Whether or not to use the platform driver. | |
253 | * | |
254 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image | |
255 | * and execute the drivers' .thaw_noirq() callbacks. | |
256 | * | |
257 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 258 | */ |
47a460d5 | 259 | static int create_image(int platform_mode) |
c7e0831d RW |
260 | { |
261 | int error; | |
262 | ||
d1616302 | 263 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 264 | if (error) { |
23976728 RW |
265 | printk(KERN_ERR "PM: Some devices failed to power down, " |
266 | "aborting hibernation\n"); | |
32bdfac5 | 267 | return error; |
c7e0831d | 268 | } |
2ed8d2b3 | 269 | |
4aecd671 RW |
270 | error = platform_pre_snapshot(platform_mode); |
271 | if (error || hibernation_test(TEST_PLATFORM)) | |
272 | goto Platform_finish; | |
273 | ||
274 | error = disable_nonboot_cpus(); | |
275 | if (error || hibernation_test(TEST_CPUS) | |
276 | || hibernation_testmode(HIBERNATION_TEST)) | |
277 | goto Enable_cpus; | |
278 | ||
2ed8d2b3 RW |
279 | local_irq_disable(); |
280 | ||
2e711c04 | 281 | error = syscore_suspend(); |
770824bd | 282 | if (error) { |
4484079d | 283 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 284 | "aborting hibernation\n"); |
4aecd671 | 285 | goto Enable_irqs; |
770824bd | 286 | } |
c7e0831d | 287 | |
a2867e08 | 288 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
289 | goto Power_up; |
290 | ||
291 | in_suspend = 1; | |
c7e0831d RW |
292 | save_processor_state(); |
293 | error = swsusp_arch_suspend(); | |
294 | if (error) | |
23976728 RW |
295 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
296 | error); | |
c7e0831d RW |
297 | /* Restore control flow magically appears here */ |
298 | restore_processor_state(); | |
c125e96f RW |
299 | if (!in_suspend) { |
300 | events_check_enabled = false; | |
c7e0831d | 301 | platform_leave(platform_mode); |
c125e96f | 302 | } |
4aecd671 | 303 | |
4cc79776 | 304 | Power_up: |
40dc166c | 305 | syscore_resume(); |
2ed8d2b3 | 306 | |
4aecd671 | 307 | Enable_irqs: |
2ed8d2b3 RW |
308 | local_irq_enable(); |
309 | ||
4aecd671 RW |
310 | Enable_cpus: |
311 | enable_nonboot_cpus(); | |
312 | ||
313 | Platform_finish: | |
314 | platform_finish(platform_mode); | |
315 | ||
d1616302 | 316 | dpm_resume_noirq(in_suspend ? |
1eede070 | 317 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 318 | |
c7e0831d RW |
319 | return error; |
320 | } | |
321 | ||
7777fab9 | 322 | /** |
f42a9813 RW |
323 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
324 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 325 | * |
f42a9813 | 326 | * This routine must be called with pm_mutex held. |
7777fab9 | 327 | */ |
7777fab9 RW |
328 | int hibernation_snapshot(int platform_mode) |
329 | { | |
91e7c75b | 330 | pm_message_t msg = PMSG_RECOVER; |
cbe2f5a6 | 331 | int error; |
7777fab9 | 332 | |
3fe0313e | 333 | error = platform_begin(platform_mode); |
7777fab9 | 334 | if (error) |
d074ee02 | 335 | goto Close; |
7777fab9 | 336 | |
91e7c75b RW |
337 | error = dpm_prepare(PMSG_FREEZE); |
338 | if (error) | |
339 | goto Complete_devices; | |
340 | ||
64a473cb RW |
341 | /* Preallocate image memory before shutting down devices. */ |
342 | error = hibernate_preallocate_memory(); | |
74f270af | 343 | if (error) |
91e7c75b | 344 | goto Complete_devices; |
74f270af | 345 | |
7777fab9 | 346 | suspend_console(); |
c9e664f1 | 347 | pm_restrict_gfp_mask(); |
91e7c75b | 348 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 349 | if (error) |
d8f3de0d | 350 | goto Recover_platform; |
10a1803d | 351 | |
4cc79776 | 352 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 353 | goto Recover_platform; |
7777fab9 | 354 | |
4aecd671 | 355 | error = create_image(platform_mode); |
c9e664f1 RW |
356 | /* |
357 | * Control returns here (1) after the image has been created or the | |
358 | * image creation has failed and (2) after a successful restore. | |
359 | */ | |
4cc79776 | 360 | |
4cc79776 | 361 | Resume_devices: |
64a473cb RW |
362 | /* We may need to release the preallocated image pages here. */ |
363 | if (error || !in_suspend) | |
364 | swsusp_free(); | |
365 | ||
91e7c75b RW |
366 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
367 | dpm_resume(msg); | |
c9e664f1 RW |
368 | |
369 | if (error || !in_suspend) | |
370 | pm_restore_gfp_mask(); | |
371 | ||
7777fab9 | 372 | resume_console(); |
91e7c75b RW |
373 | |
374 | Complete_devices: | |
375 | dpm_complete(msg); | |
376 | ||
caea99ef RW |
377 | Close: |
378 | platform_end(platform_mode); | |
7777fab9 | 379 | return error; |
d8f3de0d RW |
380 | |
381 | Recover_platform: | |
382 | platform_recover(platform_mode); | |
383 | goto Resume_devices; | |
7777fab9 RW |
384 | } |
385 | ||
72df68ca | 386 | /** |
f42a9813 RW |
387 | * resume_target_kernel - Restore system state from a hibernation image. |
388 | * @platform_mode: Whether or not to use the platform driver. | |
389 | * | |
390 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of | |
391 | * highmem that have not been restored yet from the image and run the low-level | |
392 | * code that will restore the remaining contents of memory and switch to the | |
393 | * just restored target kernel. | |
72df68ca | 394 | */ |
4aecd671 | 395 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
396 | { |
397 | int error; | |
398 | ||
d1616302 | 399 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 400 | if (error) { |
23976728 | 401 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 402 | "aborting resume\n"); |
32bdfac5 | 403 | return error; |
72df68ca | 404 | } |
2ed8d2b3 | 405 | |
4aecd671 RW |
406 | error = platform_pre_restore(platform_mode); |
407 | if (error) | |
408 | goto Cleanup; | |
409 | ||
410 | error = disable_nonboot_cpus(); | |
411 | if (error) | |
412 | goto Enable_cpus; | |
413 | ||
2ed8d2b3 RW |
414 | local_irq_disable(); |
415 | ||
2e711c04 | 416 | error = syscore_suspend(); |
4aecd671 RW |
417 | if (error) |
418 | goto Enable_irqs; | |
419 | ||
72df68ca RW |
420 | save_processor_state(); |
421 | error = restore_highmem(); | |
422 | if (!error) { | |
423 | error = swsusp_arch_resume(); | |
424 | /* | |
425 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
426 | * Otherwise, execution continues at the place where |
427 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
428 | */ |
429 | BUG_ON(!error); | |
4e2d9491 RW |
430 | /* |
431 | * This call to restore_highmem() reverts the changes made by | |
432 | * the previous one. | |
433 | */ | |
72df68ca RW |
434 | restore_highmem(); |
435 | } | |
436 | /* | |
437 | * The only reason why swsusp_arch_resume() can fail is memory being | |
438 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 439 | * subsequent failures. |
72df68ca RW |
440 | */ |
441 | swsusp_free(); | |
442 | restore_processor_state(); | |
443 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 444 | |
40dc166c | 445 | syscore_resume(); |
2ed8d2b3 | 446 | |
4aecd671 | 447 | Enable_irqs: |
72df68ca | 448 | local_irq_enable(); |
2ed8d2b3 | 449 | |
4aecd671 RW |
450 | Enable_cpus: |
451 | enable_nonboot_cpus(); | |
452 | ||
453 | Cleanup: | |
454 | platform_restore_cleanup(platform_mode); | |
455 | ||
d1616302 | 456 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 457 | |
72df68ca RW |
458 | return error; |
459 | } | |
460 | ||
7777fab9 | 461 | /** |
f42a9813 RW |
462 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
463 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 464 | * |
f42a9813 RW |
465 | * This routine must be called with pm_mutex held. If it is successful, control |
466 | * reappears in the restored target kernel in hibernation_snaphot(). | |
7777fab9 | 467 | */ |
a634cc10 | 468 | int hibernation_restore(int platform_mode) |
7777fab9 | 469 | { |
cbe2f5a6 | 470 | int error; |
7777fab9 RW |
471 | |
472 | pm_prepare_console(); | |
473 | suspend_console(); | |
c9e664f1 | 474 | pm_restrict_gfp_mask(); |
d1616302 | 475 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 476 | if (!error) { |
4aecd671 | 477 | error = resume_target_kernel(platform_mode); |
d1616302 | 478 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 479 | } |
c9e664f1 | 480 | pm_restore_gfp_mask(); |
7777fab9 RW |
481 | resume_console(); |
482 | pm_restore_console(); | |
483 | return error; | |
484 | } | |
485 | ||
486 | /** | |
f42a9813 | 487 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 488 | */ |
7777fab9 RW |
489 | int hibernation_platform_enter(void) |
490 | { | |
cbe2f5a6 | 491 | int error; |
b1457bcc | 492 | |
9cd9a005 RW |
493 | if (!hibernation_ops) |
494 | return -ENOSYS; | |
495 | ||
496 | /* | |
497 | * We have cancelled the power transition by running | |
498 | * hibernation_ops->finish() before saving the image, so we should let | |
499 | * the firmware know that we're going to enter the sleep state after all | |
500 | */ | |
caea99ef | 501 | error = hibernation_ops->begin(); |
9cd9a005 | 502 | if (error) |
caea99ef | 503 | goto Close; |
9cd9a005 | 504 | |
abfe2d7b | 505 | entering_platform_hibernation = true; |
9cd9a005 | 506 | suspend_console(); |
d1616302 | 507 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
508 | if (error) { |
509 | if (hibernation_ops->recover) | |
510 | hibernation_ops->recover(); | |
511 | goto Resume_devices; | |
512 | } | |
9cd9a005 | 513 | |
d1616302 | 514 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 515 | if (error) |
32bdfac5 | 516 | goto Resume_devices; |
4aecd671 | 517 | |
9cd9a005 RW |
518 | error = hibernation_ops->prepare(); |
519 | if (error) | |
e681c9dd | 520 | goto Platform_finish; |
9cd9a005 RW |
521 | |
522 | error = disable_nonboot_cpus(); | |
523 | if (error) | |
e681c9dd | 524 | goto Platform_finish; |
2ed8d2b3 | 525 | |
4aecd671 | 526 | local_irq_disable(); |
40dc166c | 527 | syscore_suspend(); |
a2867e08 | 528 | if (pm_wakeup_pending()) { |
c125e96f RW |
529 | error = -EAGAIN; |
530 | goto Power_up; | |
531 | } | |
532 | ||
4aecd671 RW |
533 | hibernation_ops->enter(); |
534 | /* We should never get here */ | |
535 | while (1); | |
9cd9a005 | 536 | |
c125e96f | 537 | Power_up: |
40dc166c | 538 | syscore_resume(); |
c125e96f RW |
539 | local_irq_enable(); |
540 | enable_nonboot_cpus(); | |
541 | ||
e681c9dd | 542 | Platform_finish: |
9cd9a005 | 543 | hibernation_ops->finish(); |
2ed8d2b3 | 544 | |
f6f71f18 | 545 | dpm_resume_noirq(PMSG_RESTORE); |
4aecd671 | 546 | |
9cd9a005 | 547 | Resume_devices: |
abfe2d7b | 548 | entering_platform_hibernation = false; |
d1616302 | 549 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 550 | resume_console(); |
2ed8d2b3 | 551 | |
caea99ef RW |
552 | Close: |
553 | hibernation_ops->end(); | |
2ed8d2b3 | 554 | |
b1457bcc | 555 | return error; |
7777fab9 RW |
556 | } |
557 | ||
1da177e4 | 558 | /** |
f42a9813 | 559 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 560 | * |
f42a9813 RW |
561 | * Use the platform driver, if configured, to put the system into the sleep |
562 | * state corresponding to hibernation, or try to power it off or reboot, | |
563 | * depending on the value of hibernation_mode. | |
1da177e4 | 564 | */ |
fe0c935a | 565 | static void power_down(void) |
1da177e4 | 566 | { |
a3d25c27 RW |
567 | switch (hibernation_mode) { |
568 | case HIBERNATION_TEST: | |
569 | case HIBERNATION_TESTPROC: | |
fe0c935a | 570 | break; |
a3d25c27 | 571 | case HIBERNATION_REBOOT: |
fdde86ac | 572 | kernel_restart(NULL); |
1da177e4 | 573 | break; |
a3d25c27 | 574 | case HIBERNATION_PLATFORM: |
7777fab9 | 575 | hibernation_platform_enter(); |
9cd9a005 RW |
576 | case HIBERNATION_SHUTDOWN: |
577 | kernel_power_off(); | |
578 | break; | |
1da177e4 | 579 | } |
fdde86ac | 580 | kernel_halt(); |
fe0c935a JB |
581 | /* |
582 | * Valid image is on the disk, if we continue we risk serious data | |
583 | * corruption after resume. | |
584 | */ | |
23976728 | 585 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
586 | while(1); |
587 | } | |
588 | ||
1da177e4 LT |
589 | static int prepare_processes(void) |
590 | { | |
b918f6e6 | 591 | int error = 0; |
1da177e4 | 592 | |
1da177e4 LT |
593 | if (freeze_processes()) { |
594 | error = -EBUSY; | |
5a0a2f30 | 595 | thaw_processes(); |
1da177e4 | 596 | } |
5a72e04d | 597 | return error; |
1da177e4 LT |
598 | } |
599 | ||
1da177e4 | 600 | /** |
f42a9813 | 601 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 602 | */ |
a3d25c27 | 603 | int hibernate(void) |
1da177e4 LT |
604 | { |
605 | int error; | |
606 | ||
b10d9117 | 607 | mutex_lock(&pm_mutex); |
0709db60 | 608 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
609 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
610 | error = -EBUSY; | |
611 | goto Unlock; | |
612 | } | |
613 | ||
5a0a2f30 | 614 | pm_prepare_console(); |
b10d9117 RW |
615 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
616 | if (error) | |
617 | goto Exit; | |
0709db60 | 618 | |
1bfcf130 RW |
619 | error = usermodehelper_disable(); |
620 | if (error) | |
621 | goto Exit; | |
622 | ||
0709db60 RW |
623 | /* Allocate memory management structures */ |
624 | error = create_basic_memory_bitmaps(); | |
625 | if (error) | |
626 | goto Exit; | |
627 | ||
23976728 | 628 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
629 | sys_sync(); |
630 | printk("done.\n"); | |
631 | ||
1da177e4 | 632 | error = prepare_processes(); |
5a72e04d | 633 | if (error) |
0709db60 | 634 | goto Finish; |
1da177e4 | 635 | |
4cc79776 | 636 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 637 | goto Thaw; |
4cc79776 RW |
638 | |
639 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
640 | goto Thaw; | |
641 | ||
7777fab9 | 642 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
64a473cb RW |
643 | if (error) |
644 | goto Thaw; | |
645 | ||
646 | if (in_suspend) { | |
a634cc10 RW |
647 | unsigned int flags = 0; |
648 | ||
649 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
650 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
651 | if (nocompress) |
652 | flags |= SF_NOCOMPRESS_MODE; | |
1da177e4 | 653 | pr_debug("PM: writing image.\n"); |
a634cc10 | 654 | error = swsusp_write(flags); |
7777fab9 | 655 | swsusp_free(); |
1da177e4 | 656 | if (!error) |
fe0c935a | 657 | power_down(); |
5262a475 | 658 | in_suspend = 0; |
c9e664f1 | 659 | pm_restore_gfp_mask(); |
b918f6e6 | 660 | } else { |
1da177e4 | 661 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 662 | } |
64a473cb | 663 | |
b918f6e6 | 664 | Thaw: |
5a0a2f30 | 665 | thaw_processes(); |
0709db60 RW |
666 | Finish: |
667 | free_basic_memory_bitmaps(); | |
1bfcf130 | 668 | usermodehelper_enable(); |
0709db60 | 669 | Exit: |
b10d9117 | 670 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 671 | pm_restore_console(); |
0709db60 | 672 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
673 | Unlock: |
674 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
675 | return error; |
676 | } | |
677 | ||
678 | ||
679 | /** | |
f42a9813 RW |
680 | * software_resume - Resume from a saved hibernation image. |
681 | * | |
682 | * This routine is called as a late initcall, when all devices have been | |
683 | * discovered and initialized already. | |
1da177e4 | 684 | * |
f42a9813 RW |
685 | * The image reading code is called to see if there is a hibernation image |
686 | * available for reading. If that is the case, devices are quiesced and the | |
687 | * contents of memory is restored from the saved image. | |
1da177e4 | 688 | * |
f42a9813 RW |
689 | * If this is successful, control reappears in the restored target kernel in |
690 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
691 | * attempts to recover gracefully and make the kernel return to the normal mode | |
692 | * of operation. | |
1da177e4 | 693 | */ |
1da177e4 LT |
694 | static int software_resume(void) |
695 | { | |
696 | int error; | |
a634cc10 | 697 | unsigned int flags; |
1da177e4 | 698 | |
eed3ee08 AV |
699 | /* |
700 | * If the user said "noresume".. bail out early. | |
701 | */ | |
702 | if (noresume) | |
703 | return 0; | |
704 | ||
60a0d233 JB |
705 | /* |
706 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
707 | * is configured into the kernel. Since the regular hibernate | |
708 | * trigger path is via sysfs which takes a buffer mutex before | |
709 | * calling hibernate functions (which take pm_mutex) this can | |
710 | * cause lockdep to complain about a possible ABBA deadlock | |
711 | * which cannot happen since we're in the boot code here and | |
712 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
713 | * here to avoid lockdep complaining. | |
714 | */ | |
715 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
716 | |
717 | if (swsusp_resume_device) | |
718 | goto Check_image; | |
719 | ||
720 | if (!strlen(resume_file)) { | |
721 | error = -ENOENT; | |
722 | goto Unlock; | |
723 | } | |
724 | ||
d0941ead | 725 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 RW |
726 | |
727 | /* Check if the device is there */ | |
728 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 729 | if (!swsusp_resume_device) { |
eed3ee08 AV |
730 | /* |
731 | * Some device discovery might still be in progress; we need | |
732 | * to wait for this to finish. | |
733 | */ | |
734 | wait_for_device_probe(); | |
0c8454f5 RW |
735 | /* |
736 | * We can't depend on SCSI devices being available after loading | |
737 | * one of their modules until scsi_complete_async_scans() is | |
738 | * called and the resume device usually is a SCSI one. | |
739 | */ | |
740 | scsi_complete_async_scans(); | |
741 | ||
3efa147a | 742 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
743 | if (!swsusp_resume_device) { |
744 | error = -ENODEV; | |
745 | goto Unlock; | |
746 | } | |
3efa147a PM |
747 | } |
748 | ||
0c8454f5 | 749 | Check_image: |
d0941ead | 750 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 751 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 752 | |
d0941ead | 753 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
754 | error = swsusp_check(); |
755 | if (error) | |
74dfd666 | 756 | goto Unlock; |
1da177e4 | 757 | |
0709db60 RW |
758 | /* The snapshot device should not be opened while we're running */ |
759 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
760 | error = -EBUSY; | |
76b57e61 | 761 | swsusp_close(FMODE_READ); |
0709db60 RW |
762 | goto Unlock; |
763 | } | |
764 | ||
5a0a2f30 | 765 | pm_prepare_console(); |
c3e94d89 AS |
766 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
767 | if (error) | |
76b57e61 | 768 | goto close_finish; |
c3e94d89 | 769 | |
1bfcf130 RW |
770 | error = usermodehelper_disable(); |
771 | if (error) | |
76b57e61 | 772 | goto close_finish; |
1bfcf130 | 773 | |
74dfd666 RW |
774 | error = create_basic_memory_bitmaps(); |
775 | if (error) | |
76b57e61 | 776 | goto close_finish; |
1da177e4 | 777 | |
74dfd666 | 778 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
779 | error = prepare_processes(); |
780 | if (error) { | |
c2dd0dae | 781 | swsusp_close(FMODE_READ); |
5a72e04d | 782 | goto Done; |
1da177e4 LT |
783 | } |
784 | ||
d0941ead | 785 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 786 | |
a634cc10 | 787 | error = swsusp_read(&flags); |
76b57e61 | 788 | swsusp_close(FMODE_READ); |
ed746e3b | 789 | if (!error) |
a634cc10 | 790 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 791 | |
d0941ead | 792 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 793 | swsusp_free(); |
5a0a2f30 | 794 | thaw_processes(); |
1da177e4 | 795 | Done: |
74dfd666 | 796 | free_basic_memory_bitmaps(); |
1bfcf130 | 797 | usermodehelper_enable(); |
0709db60 | 798 | Finish: |
c3e94d89 | 799 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 800 | pm_restore_console(); |
0709db60 | 801 | atomic_inc(&snapshot_device_available); |
dd5d666b | 802 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 803 | Unlock: |
a6d70980 | 804 | mutex_unlock(&pm_mutex); |
d0941ead | 805 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 806 | return error; |
76b57e61 JS |
807 | close_finish: |
808 | swsusp_close(FMODE_READ); | |
809 | goto Finish; | |
1da177e4 LT |
810 | } |
811 | ||
812 | late_initcall(software_resume); | |
813 | ||
814 | ||
a3d25c27 RW |
815 | static const char * const hibernation_modes[] = { |
816 | [HIBERNATION_PLATFORM] = "platform", | |
817 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
818 | [HIBERNATION_REBOOT] = "reboot", | |
819 | [HIBERNATION_TEST] = "test", | |
820 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
821 | }; |
822 | ||
f42a9813 RW |
823 | /* |
824 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 825 | * |
f42a9813 RW |
826 | * Hibernation can be handled in several ways. There are a few different ways |
827 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
828 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
829 | * mostly), or using one of the two available test modes. | |
1da177e4 | 830 | * |
f42a9813 RW |
831 | * The sysfs file /sys/power/disk provides an interface for selecting the |
832 | * hibernation mode to use. Reading from this file causes the available modes | |
833 | * to be printed. There are 5 modes that can be supported: | |
1da177e4 | 834 | * |
1da177e4 LT |
835 | * 'platform' |
836 | * 'shutdown' | |
837 | * 'reboot' | |
11d77d0c JB |
838 | * 'test' |
839 | * 'testproc' | |
1da177e4 | 840 | * |
f42a9813 RW |
841 | * If a platform hibernation driver is in use, 'platform' will be supported |
842 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
843 | * The selected option (i.e. the one corresponding to the current value of | |
844 | * hibernation_mode) is enclosed by a square bracket. | |
845 | * | |
846 | * To select a given hibernation mode it is necessary to write the mode's | |
847 | * string representation (as returned by reading from /sys/power/disk) back | |
848 | * into /sys/power/disk. | |
1da177e4 LT |
849 | */ |
850 | ||
386f275f KS |
851 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
852 | char *buf) | |
1da177e4 | 853 | { |
f0ced9b2 JB |
854 | int i; |
855 | char *start = buf; | |
856 | ||
a3d25c27 RW |
857 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
858 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
859 | continue; |
860 | switch (i) { | |
a3d25c27 RW |
861 | case HIBERNATION_SHUTDOWN: |
862 | case HIBERNATION_REBOOT: | |
863 | case HIBERNATION_TEST: | |
864 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 865 | break; |
a3d25c27 RW |
866 | case HIBERNATION_PLATFORM: |
867 | if (hibernation_ops) | |
f0ced9b2 JB |
868 | break; |
869 | /* not a valid mode, continue with loop */ | |
870 | continue; | |
871 | } | |
a3d25c27 RW |
872 | if (i == hibernation_mode) |
873 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 874 | else |
a3d25c27 | 875 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
876 | } |
877 | buf += sprintf(buf, "\n"); | |
878 | return buf-start; | |
1da177e4 LT |
879 | } |
880 | ||
386f275f KS |
881 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
882 | const char *buf, size_t n) | |
1da177e4 LT |
883 | { |
884 | int error = 0; | |
885 | int i; | |
886 | int len; | |
887 | char *p; | |
a3d25c27 | 888 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
889 | |
890 | p = memchr(buf, '\n', n); | |
891 | len = p ? p - buf : n; | |
892 | ||
a6d70980 | 893 | mutex_lock(&pm_mutex); |
a3d25c27 | 894 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
895 | if (len == strlen(hibernation_modes[i]) |
896 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
897 | mode = i; |
898 | break; | |
899 | } | |
900 | } | |
a3d25c27 | 901 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 902 | switch (mode) { |
a3d25c27 RW |
903 | case HIBERNATION_SHUTDOWN: |
904 | case HIBERNATION_REBOOT: | |
905 | case HIBERNATION_TEST: | |
906 | case HIBERNATION_TESTPROC: | |
907 | hibernation_mode = mode; | |
fe0c935a | 908 | break; |
a3d25c27 RW |
909 | case HIBERNATION_PLATFORM: |
910 | if (hibernation_ops) | |
911 | hibernation_mode = mode; | |
1da177e4 LT |
912 | else |
913 | error = -EINVAL; | |
914 | } | |
a3d25c27 | 915 | } else |
1da177e4 LT |
916 | error = -EINVAL; |
917 | ||
a3d25c27 | 918 | if (!error) |
23976728 | 919 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 920 | hibernation_modes[mode]); |
a6d70980 | 921 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
922 | return error ? error : n; |
923 | } | |
924 | ||
925 | power_attr(disk); | |
926 | ||
386f275f KS |
927 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
928 | char *buf) | |
1da177e4 LT |
929 | { |
930 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
931 | MINOR(swsusp_resume_device)); | |
932 | } | |
933 | ||
386f275f KS |
934 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
935 | const char *buf, size_t n) | |
1da177e4 | 936 | { |
1da177e4 | 937 | unsigned int maj, min; |
1da177e4 | 938 | dev_t res; |
a576219a | 939 | int ret = -EINVAL; |
1da177e4 | 940 | |
a576219a AM |
941 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
942 | goto out; | |
1da177e4 | 943 | |
a576219a AM |
944 | res = MKDEV(maj,min); |
945 | if (maj != MAJOR(res) || min != MINOR(res)) | |
946 | goto out; | |
1da177e4 | 947 | |
a6d70980 | 948 | mutex_lock(&pm_mutex); |
a576219a | 949 | swsusp_resume_device = res; |
a6d70980 | 950 | mutex_unlock(&pm_mutex); |
23976728 | 951 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
952 | noresume = 0; |
953 | software_resume(); | |
954 | ret = n; | |
59a49335 | 955 | out: |
a576219a | 956 | return ret; |
1da177e4 LT |
957 | } |
958 | ||
959 | power_attr(resume); | |
960 | ||
386f275f KS |
961 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
962 | char *buf) | |
ca0aec0f | 963 | { |
853609b6 | 964 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
965 | } |
966 | ||
386f275f KS |
967 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
968 | const char *buf, size_t n) | |
ca0aec0f | 969 | { |
853609b6 | 970 | unsigned long size; |
ca0aec0f | 971 | |
853609b6 | 972 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
973 | image_size = size; |
974 | return n; | |
975 | } | |
976 | ||
977 | return -EINVAL; | |
978 | } | |
979 | ||
980 | power_attr(image_size); | |
981 | ||
ddeb6487 RW |
982 | static ssize_t reserved_size_show(struct kobject *kobj, |
983 | struct kobj_attribute *attr, char *buf) | |
984 | { | |
985 | return sprintf(buf, "%lu\n", reserved_size); | |
986 | } | |
987 | ||
988 | static ssize_t reserved_size_store(struct kobject *kobj, | |
989 | struct kobj_attribute *attr, | |
990 | const char *buf, size_t n) | |
991 | { | |
992 | unsigned long size; | |
993 | ||
994 | if (sscanf(buf, "%lu", &size) == 1) { | |
995 | reserved_size = size; | |
996 | return n; | |
997 | } | |
998 | ||
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
1002 | power_attr(reserved_size); | |
1003 | ||
1da177e4 LT |
1004 | static struct attribute * g[] = { |
1005 | &disk_attr.attr, | |
1006 | &resume_attr.attr, | |
ca0aec0f | 1007 | &image_size_attr.attr, |
ddeb6487 | 1008 | &reserved_size_attr.attr, |
1da177e4 LT |
1009 | NULL, |
1010 | }; | |
1011 | ||
1012 | ||
1013 | static struct attribute_group attr_group = { | |
1014 | .attrs = g, | |
1015 | }; | |
1016 | ||
1017 | ||
1018 | static int __init pm_disk_init(void) | |
1019 | { | |
d76e15fb | 1020 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | core_initcall(pm_disk_init); | |
1024 | ||
1025 | ||
1026 | static int __init resume_setup(char *str) | |
1027 | { | |
1028 | if (noresume) | |
1029 | return 1; | |
1030 | ||
1031 | strncpy( resume_file, str, 255 ); | |
1032 | return 1; | |
1033 | } | |
1034 | ||
9a154d9d RW |
1035 | static int __init resume_offset_setup(char *str) |
1036 | { | |
1037 | unsigned long long offset; | |
1038 | ||
1039 | if (noresume) | |
1040 | return 1; | |
1041 | ||
1042 | if (sscanf(str, "%llu", &offset) == 1) | |
1043 | swsusp_resume_block = offset; | |
1044 | ||
1045 | return 1; | |
1046 | } | |
1047 | ||
f996fc96 BS |
1048 | static int __init hibernate_setup(char *str) |
1049 | { | |
1050 | if (!strncmp(str, "noresume", 8)) | |
1051 | noresume = 1; | |
1052 | else if (!strncmp(str, "nocompress", 10)) | |
1053 | nocompress = 1; | |
1054 | return 1; | |
1055 | } | |
1056 | ||
1da177e4 LT |
1057 | static int __init noresume_setup(char *str) |
1058 | { | |
1059 | noresume = 1; | |
1060 | return 1; | |
1061 | } | |
1062 | ||
1063 | __setup("noresume", noresume_setup); | |
9a154d9d | 1064 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1065 | __setup("resume=", resume_setup); |
f996fc96 | 1066 | __setup("hibernate=", hibernate_setup); |