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> | |
6f8d7022 | 17 | #include <linux/async.h> |
1bfcf130 | 18 | #include <linux/kmod.h> |
1da177e4 LT |
19 | #include <linux/delay.h> |
20 | #include <linux/fs.h> | |
d53d9f16 | 21 | #include <linux/mount.h> |
88d10bba | 22 | #include <linux/pm.h> |
97c7801c | 23 | #include <linux/console.h> |
e3920fb4 | 24 | #include <linux/cpu.h> |
7dfb7103 | 25 | #include <linux/freezer.h> |
5a0e3ad6 | 26 | #include <linux/gfp.h> |
40dc166c | 27 | #include <linux/syscore_ops.h> |
c7510859 | 28 | #include <scsi/scsi_scan.h> |
d53d9f16 | 29 | |
1da177e4 LT |
30 | #include "power.h" |
31 | ||
32 | ||
f996fc96 | 33 | static int nocompress = 0; |
1da177e4 | 34 | static int noresume = 0; |
6f8d7022 | 35 | static int resume_wait = 0; |
47a460d5 | 36 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 37 | dev_t swsusp_resume_device; |
9a154d9d | 38 | sector_t swsusp_resume_block; |
8e60c6a1 | 39 | int in_suspend __nosavedata = 0; |
1da177e4 | 40 | |
a3d25c27 RW |
41 | enum { |
42 | HIBERNATION_INVALID, | |
43 | HIBERNATION_PLATFORM, | |
44 | HIBERNATION_TEST, | |
45 | HIBERNATION_TESTPROC, | |
46 | HIBERNATION_SHUTDOWN, | |
47 | HIBERNATION_REBOOT, | |
48 | /* keep last */ | |
49 | __HIBERNATION_AFTER_LAST | |
50 | }; | |
51 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
52 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
53 | ||
54 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
55 | ||
073ef1f6 | 56 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
57 | |
58 | /** | |
f42a9813 RW |
59 | * hibernation_set_ops - Set the global hibernate operations. |
60 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 61 | */ |
073ef1f6 | 62 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 63 | { |
caea99ef RW |
64 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
65 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 66 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
67 | WARN_ON(1); |
68 | return; | |
69 | } | |
70 | mutex_lock(&pm_mutex); | |
71 | hibernation_ops = ops; | |
72 | if (ops) | |
73 | hibernation_mode = HIBERNATION_PLATFORM; | |
74 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
75 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
76 | ||
77 | mutex_unlock(&pm_mutex); | |
78 | } | |
79 | ||
abfe2d7b RW |
80 | static bool entering_platform_hibernation; |
81 | ||
82 | bool system_entering_hibernation(void) | |
83 | { | |
84 | return entering_platform_hibernation; | |
85 | } | |
86 | EXPORT_SYMBOL(system_entering_hibernation); | |
87 | ||
4cc79776 RW |
88 | #ifdef CONFIG_PM_DEBUG |
89 | static void hibernation_debug_sleep(void) | |
90 | { | |
91 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
92 | mdelay(5000); | |
93 | } | |
94 | ||
95 | static int hibernation_testmode(int mode) | |
96 | { | |
97 | if (hibernation_mode == mode) { | |
98 | hibernation_debug_sleep(); | |
99 | return 1; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static int hibernation_test(int level) | |
105 | { | |
106 | if (pm_test_level == level) { | |
107 | hibernation_debug_sleep(); | |
108 | return 1; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | #else /* !CONFIG_PM_DEBUG */ | |
113 | static int hibernation_testmode(int mode) { return 0; } | |
114 | static int hibernation_test(int level) { return 0; } | |
115 | #endif /* !CONFIG_PM_DEBUG */ | |
116 | ||
74f270af | 117 | /** |
f42a9813 RW |
118 | * platform_begin - Call platform to start hibernation. |
119 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 120 | */ |
caea99ef | 121 | static int platform_begin(int platform_mode) |
74f270af RW |
122 | { |
123 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
124 | hibernation_ops->begin() : 0; |
125 | } | |
126 | ||
127 | /** | |
f42a9813 RW |
128 | * platform_end - Call platform to finish transition to the working state. |
129 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 130 | */ |
caea99ef RW |
131 | static void platform_end(int platform_mode) |
132 | { | |
133 | if (platform_mode && hibernation_ops) | |
134 | hibernation_ops->end(); | |
74f270af | 135 | } |
a3d25c27 | 136 | |
8a05aac2 | 137 | /** |
f42a9813 RW |
138 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
139 | * @platform_mode: Whether or not to use the platform driver. | |
140 | * | |
141 | * Use the platform driver to prepare the system for creating a hibernate image, | |
142 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
143 | */ |
144 | ||
74f270af | 145 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 146 | { |
7777fab9 | 147 | return (platform_mode && hibernation_ops) ? |
74f270af | 148 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 149 | } |
8a05aac2 | 150 | |
c7e0831d | 151 | /** |
f42a9813 RW |
152 | * platform_leave - Call platform to prepare a transition to the working state. |
153 | * @platform_mode: Whether or not to use the platform driver. | |
154 | * | |
155 | * Use the platform driver prepare to prepare the machine for switching to the | |
156 | * normal mode of operation. | |
157 | * | |
158 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 159 | */ |
c7e0831d RW |
160 | static void platform_leave(int platform_mode) |
161 | { | |
162 | if (platform_mode && hibernation_ops) | |
163 | hibernation_ops->leave(); | |
164 | } | |
165 | ||
a3d25c27 | 166 | /** |
f42a9813 RW |
167 | * platform_finish - Call platform to switch the system to the working state. |
168 | * @platform_mode: Whether or not to use the platform driver. | |
169 | * | |
170 | * Use the platform driver to switch the machine to the normal mode of | |
171 | * operation. | |
172 | * | |
173 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 174 | */ |
7777fab9 | 175 | static void platform_finish(int platform_mode) |
a3d25c27 | 176 | { |
7777fab9 | 177 | if (platform_mode && hibernation_ops) |
a3d25c27 | 178 | hibernation_ops->finish(); |
8a05aac2 SS |
179 | } |
180 | ||
a634cc10 | 181 | /** |
f42a9813 RW |
182 | * platform_pre_restore - Prepare for hibernate image restoration. |
183 | * @platform_mode: Whether or not to use the platform driver. | |
184 | * | |
185 | * Use the platform driver to prepare the system for resume from a hibernation | |
186 | * image. | |
187 | * | |
188 | * If the restore fails after this function has been called, | |
189 | * platform_restore_cleanup() must be called. | |
a634cc10 | 190 | */ |
a634cc10 RW |
191 | static int platform_pre_restore(int platform_mode) |
192 | { | |
193 | return (platform_mode && hibernation_ops) ? | |
194 | hibernation_ops->pre_restore() : 0; | |
195 | } | |
196 | ||
197 | /** | |
f42a9813 RW |
198 | * platform_restore_cleanup - Switch to the working state after failing restore. |
199 | * @platform_mode: Whether or not to use the platform driver. | |
200 | * | |
201 | * Use the platform driver to switch the system to the normal mode of operation | |
202 | * after a failing restore. | |
203 | * | |
204 | * If platform_pre_restore() has been called before the failing restore, this | |
205 | * function must be called too, regardless of the result of | |
206 | * platform_pre_restore(). | |
a634cc10 | 207 | */ |
a634cc10 RW |
208 | static void platform_restore_cleanup(int platform_mode) |
209 | { | |
210 | if (platform_mode && hibernation_ops) | |
211 | hibernation_ops->restore_cleanup(); | |
212 | } | |
213 | ||
d8f3de0d | 214 | /** |
f42a9813 RW |
215 | * platform_recover - Recover from a failure to suspend devices. |
216 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 217 | */ |
d8f3de0d RW |
218 | static void platform_recover(int platform_mode) |
219 | { | |
220 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
221 | hibernation_ops->recover(); | |
222 | } | |
223 | ||
8e60c6a1 | 224 | /** |
f42a9813 RW |
225 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
226 | * @start: Starting event. | |
227 | * @stop: Final event. | |
228 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
229 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 230 | */ |
8e60c6a1 NC |
231 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
232 | unsigned nr_pages, char *msg) | |
233 | { | |
234 | s64 elapsed_centisecs64; | |
235 | int centisecs; | |
236 | int k; | |
237 | int kps; | |
238 | ||
239 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
240 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
241 | centisecs = elapsed_centisecs64; | |
242 | if (centisecs == 0) | |
243 | centisecs = 1; /* avoid div-by-zero */ | |
244 | k = nr_pages * (PAGE_SIZE / 1024); | |
245 | kps = (k * 100) / centisecs; | |
246 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
247 | msg, k, | |
248 | centisecs / 100, centisecs % 100, | |
249 | kps / 1000, (kps % 1000) / 10); | |
250 | } | |
251 | ||
c7e0831d | 252 | /** |
f42a9813 RW |
253 | * create_image - Create a hibernation image. |
254 | * @platform_mode: Whether or not to use the platform driver. | |
255 | * | |
256 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image | |
257 | * and execute the drivers' .thaw_noirq() callbacks. | |
258 | * | |
259 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 260 | */ |
47a460d5 | 261 | static int create_image(int platform_mode) |
c7e0831d RW |
262 | { |
263 | int error; | |
264 | ||
d1616302 | 265 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 266 | if (error) { |
23976728 RW |
267 | printk(KERN_ERR "PM: Some devices failed to power down, " |
268 | "aborting hibernation\n"); | |
32bdfac5 | 269 | return error; |
c7e0831d | 270 | } |
2ed8d2b3 | 271 | |
4aecd671 RW |
272 | error = platform_pre_snapshot(platform_mode); |
273 | if (error || hibernation_test(TEST_PLATFORM)) | |
274 | goto Platform_finish; | |
275 | ||
276 | error = disable_nonboot_cpus(); | |
277 | if (error || hibernation_test(TEST_CPUS) | |
278 | || hibernation_testmode(HIBERNATION_TEST)) | |
279 | goto Enable_cpus; | |
280 | ||
2ed8d2b3 RW |
281 | local_irq_disable(); |
282 | ||
2e711c04 | 283 | error = syscore_suspend(); |
770824bd | 284 | if (error) { |
4484079d | 285 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 286 | "aborting hibernation\n"); |
4aecd671 | 287 | goto Enable_irqs; |
770824bd | 288 | } |
c7e0831d | 289 | |
a2867e08 | 290 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
291 | goto Power_up; |
292 | ||
293 | in_suspend = 1; | |
c7e0831d RW |
294 | save_processor_state(); |
295 | error = swsusp_arch_suspend(); | |
296 | if (error) | |
23976728 RW |
297 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
298 | error); | |
c7e0831d RW |
299 | /* Restore control flow magically appears here */ |
300 | restore_processor_state(); | |
c125e96f RW |
301 | if (!in_suspend) { |
302 | events_check_enabled = false; | |
c7e0831d | 303 | platform_leave(platform_mode); |
c125e96f | 304 | } |
4aecd671 | 305 | |
4cc79776 | 306 | Power_up: |
40dc166c | 307 | syscore_resume(); |
2ed8d2b3 | 308 | |
4aecd671 | 309 | Enable_irqs: |
2ed8d2b3 RW |
310 | local_irq_enable(); |
311 | ||
4aecd671 RW |
312 | Enable_cpus: |
313 | enable_nonboot_cpus(); | |
314 | ||
315 | Platform_finish: | |
316 | platform_finish(platform_mode); | |
317 | ||
d1616302 | 318 | dpm_resume_noirq(in_suspend ? |
1eede070 | 319 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 320 | |
c7e0831d RW |
321 | return error; |
322 | } | |
323 | ||
7777fab9 | 324 | /** |
f42a9813 RW |
325 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
326 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 327 | * |
f42a9813 | 328 | * This routine must be called with pm_mutex held. |
7777fab9 | 329 | */ |
7777fab9 RW |
330 | int hibernation_snapshot(int platform_mode) |
331 | { | |
91e7c75b | 332 | pm_message_t msg = PMSG_RECOVER; |
cbe2f5a6 | 333 | int error; |
7777fab9 | 334 | |
3fe0313e | 335 | error = platform_begin(platform_mode); |
7777fab9 | 336 | if (error) |
d074ee02 | 337 | goto Close; |
7777fab9 | 338 | |
64a473cb RW |
339 | /* Preallocate image memory before shutting down devices. */ |
340 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
341 | if (error) |
342 | goto Close; | |
343 | ||
344 | error = freeze_kernel_threads(); | |
345 | if (error) | |
346 | goto Close; | |
347 | ||
348 | error = dpm_prepare(PMSG_FREEZE); | |
74f270af | 349 | if (error) |
91e7c75b | 350 | goto Complete_devices; |
74f270af | 351 | |
7777fab9 | 352 | suspend_console(); |
c9e664f1 | 353 | pm_restrict_gfp_mask(); |
91e7c75b | 354 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 355 | if (error) |
d8f3de0d | 356 | goto Recover_platform; |
10a1803d | 357 | |
4cc79776 | 358 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 359 | goto Recover_platform; |
7777fab9 | 360 | |
4aecd671 | 361 | error = create_image(platform_mode); |
c9e664f1 RW |
362 | /* |
363 | * Control returns here (1) after the image has been created or the | |
364 | * image creation has failed and (2) after a successful restore. | |
365 | */ | |
4cc79776 | 366 | |
4cc79776 | 367 | Resume_devices: |
64a473cb RW |
368 | /* We may need to release the preallocated image pages here. */ |
369 | if (error || !in_suspend) | |
370 | swsusp_free(); | |
371 | ||
91e7c75b RW |
372 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
373 | dpm_resume(msg); | |
c9e664f1 RW |
374 | |
375 | if (error || !in_suspend) | |
376 | pm_restore_gfp_mask(); | |
377 | ||
7777fab9 | 378 | resume_console(); |
91e7c75b RW |
379 | |
380 | Complete_devices: | |
381 | dpm_complete(msg); | |
382 | ||
caea99ef RW |
383 | Close: |
384 | platform_end(platform_mode); | |
7777fab9 | 385 | return error; |
d8f3de0d RW |
386 | |
387 | Recover_platform: | |
388 | platform_recover(platform_mode); | |
389 | goto Resume_devices; | |
7777fab9 RW |
390 | } |
391 | ||
72df68ca | 392 | /** |
f42a9813 RW |
393 | * resume_target_kernel - Restore system state from a hibernation image. |
394 | * @platform_mode: Whether or not to use the platform driver. | |
395 | * | |
396 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of | |
397 | * highmem that have not been restored yet from the image and run the low-level | |
398 | * code that will restore the remaining contents of memory and switch to the | |
399 | * just restored target kernel. | |
72df68ca | 400 | */ |
4aecd671 | 401 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
402 | { |
403 | int error; | |
404 | ||
d1616302 | 405 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 406 | if (error) { |
23976728 | 407 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 408 | "aborting resume\n"); |
32bdfac5 | 409 | return error; |
72df68ca | 410 | } |
2ed8d2b3 | 411 | |
4aecd671 RW |
412 | error = platform_pre_restore(platform_mode); |
413 | if (error) | |
414 | goto Cleanup; | |
415 | ||
416 | error = disable_nonboot_cpus(); | |
417 | if (error) | |
418 | goto Enable_cpus; | |
419 | ||
2ed8d2b3 RW |
420 | local_irq_disable(); |
421 | ||
2e711c04 | 422 | error = syscore_suspend(); |
4aecd671 RW |
423 | if (error) |
424 | goto Enable_irqs; | |
425 | ||
72df68ca RW |
426 | save_processor_state(); |
427 | error = restore_highmem(); | |
428 | if (!error) { | |
429 | error = swsusp_arch_resume(); | |
430 | /* | |
431 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
432 | * Otherwise, execution continues at the place where |
433 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
434 | */ |
435 | BUG_ON(!error); | |
4e2d9491 RW |
436 | /* |
437 | * This call to restore_highmem() reverts the changes made by | |
438 | * the previous one. | |
439 | */ | |
72df68ca RW |
440 | restore_highmem(); |
441 | } | |
442 | /* | |
443 | * The only reason why swsusp_arch_resume() can fail is memory being | |
444 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 445 | * subsequent failures. |
72df68ca RW |
446 | */ |
447 | swsusp_free(); | |
448 | restore_processor_state(); | |
449 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 450 | |
40dc166c | 451 | syscore_resume(); |
2ed8d2b3 | 452 | |
4aecd671 | 453 | Enable_irqs: |
72df68ca | 454 | local_irq_enable(); |
2ed8d2b3 | 455 | |
4aecd671 RW |
456 | Enable_cpus: |
457 | enable_nonboot_cpus(); | |
458 | ||
459 | Cleanup: | |
460 | platform_restore_cleanup(platform_mode); | |
461 | ||
d1616302 | 462 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 463 | |
72df68ca RW |
464 | return error; |
465 | } | |
466 | ||
7777fab9 | 467 | /** |
f42a9813 RW |
468 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
469 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 470 | * |
f42a9813 | 471 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 472 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 473 | */ |
a634cc10 | 474 | int hibernation_restore(int platform_mode) |
7777fab9 | 475 | { |
cbe2f5a6 | 476 | int error; |
7777fab9 RW |
477 | |
478 | pm_prepare_console(); | |
479 | suspend_console(); | |
c9e664f1 | 480 | pm_restrict_gfp_mask(); |
d1616302 | 481 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 482 | if (!error) { |
4aecd671 | 483 | error = resume_target_kernel(platform_mode); |
d1616302 | 484 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 485 | } |
c9e664f1 | 486 | pm_restore_gfp_mask(); |
7777fab9 RW |
487 | resume_console(); |
488 | pm_restore_console(); | |
489 | return error; | |
490 | } | |
491 | ||
492 | /** | |
f42a9813 | 493 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 494 | */ |
7777fab9 RW |
495 | int hibernation_platform_enter(void) |
496 | { | |
cbe2f5a6 | 497 | int error; |
b1457bcc | 498 | |
9cd9a005 RW |
499 | if (!hibernation_ops) |
500 | return -ENOSYS; | |
501 | ||
502 | /* | |
503 | * We have cancelled the power transition by running | |
504 | * hibernation_ops->finish() before saving the image, so we should let | |
505 | * the firmware know that we're going to enter the sleep state after all | |
506 | */ | |
caea99ef | 507 | error = hibernation_ops->begin(); |
9cd9a005 | 508 | if (error) |
caea99ef | 509 | goto Close; |
9cd9a005 | 510 | |
abfe2d7b | 511 | entering_platform_hibernation = true; |
9cd9a005 | 512 | suspend_console(); |
d1616302 | 513 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
514 | if (error) { |
515 | if (hibernation_ops->recover) | |
516 | hibernation_ops->recover(); | |
517 | goto Resume_devices; | |
518 | } | |
9cd9a005 | 519 | |
d1616302 | 520 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 521 | if (error) |
32bdfac5 | 522 | goto Resume_devices; |
4aecd671 | 523 | |
9cd9a005 RW |
524 | error = hibernation_ops->prepare(); |
525 | if (error) | |
e681c9dd | 526 | goto Platform_finish; |
9cd9a005 RW |
527 | |
528 | error = disable_nonboot_cpus(); | |
529 | if (error) | |
e681c9dd | 530 | goto Platform_finish; |
2ed8d2b3 | 531 | |
4aecd671 | 532 | local_irq_disable(); |
40dc166c | 533 | syscore_suspend(); |
a2867e08 | 534 | if (pm_wakeup_pending()) { |
c125e96f RW |
535 | error = -EAGAIN; |
536 | goto Power_up; | |
537 | } | |
538 | ||
4aecd671 RW |
539 | hibernation_ops->enter(); |
540 | /* We should never get here */ | |
541 | while (1); | |
9cd9a005 | 542 | |
c125e96f | 543 | Power_up: |
40dc166c | 544 | syscore_resume(); |
c125e96f RW |
545 | local_irq_enable(); |
546 | enable_nonboot_cpus(); | |
547 | ||
e681c9dd | 548 | Platform_finish: |
9cd9a005 | 549 | hibernation_ops->finish(); |
2ed8d2b3 | 550 | |
f6f71f18 | 551 | dpm_resume_noirq(PMSG_RESTORE); |
4aecd671 | 552 | |
9cd9a005 | 553 | Resume_devices: |
abfe2d7b | 554 | entering_platform_hibernation = false; |
d1616302 | 555 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 556 | resume_console(); |
2ed8d2b3 | 557 | |
caea99ef RW |
558 | Close: |
559 | hibernation_ops->end(); | |
2ed8d2b3 | 560 | |
b1457bcc | 561 | return error; |
7777fab9 RW |
562 | } |
563 | ||
1da177e4 | 564 | /** |
f42a9813 | 565 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 566 | * |
f42a9813 RW |
567 | * Use the platform driver, if configured, to put the system into the sleep |
568 | * state corresponding to hibernation, or try to power it off or reboot, | |
569 | * depending on the value of hibernation_mode. | |
1da177e4 | 570 | */ |
fe0c935a | 571 | static void power_down(void) |
1da177e4 | 572 | { |
a3d25c27 RW |
573 | switch (hibernation_mode) { |
574 | case HIBERNATION_TEST: | |
575 | case HIBERNATION_TESTPROC: | |
fe0c935a | 576 | break; |
a3d25c27 | 577 | case HIBERNATION_REBOOT: |
fdde86ac | 578 | kernel_restart(NULL); |
1da177e4 | 579 | break; |
a3d25c27 | 580 | case HIBERNATION_PLATFORM: |
7777fab9 | 581 | hibernation_platform_enter(); |
9cd9a005 RW |
582 | case HIBERNATION_SHUTDOWN: |
583 | kernel_power_off(); | |
584 | break; | |
1da177e4 | 585 | } |
fdde86ac | 586 | kernel_halt(); |
fe0c935a JB |
587 | /* |
588 | * Valid image is on the disk, if we continue we risk serious data | |
589 | * corruption after resume. | |
590 | */ | |
23976728 | 591 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
592 | while(1); |
593 | } | |
594 | ||
1da177e4 LT |
595 | static int prepare_processes(void) |
596 | { | |
b918f6e6 | 597 | int error = 0; |
1da177e4 | 598 | |
1da177e4 LT |
599 | if (freeze_processes()) { |
600 | error = -EBUSY; | |
5a0a2f30 | 601 | thaw_processes(); |
1da177e4 | 602 | } |
5a72e04d | 603 | return error; |
1da177e4 LT |
604 | } |
605 | ||
1da177e4 | 606 | /** |
f42a9813 | 607 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 608 | */ |
a3d25c27 | 609 | int hibernate(void) |
1da177e4 LT |
610 | { |
611 | int error; | |
612 | ||
b10d9117 | 613 | mutex_lock(&pm_mutex); |
0709db60 | 614 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
615 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
616 | error = -EBUSY; | |
617 | goto Unlock; | |
618 | } | |
619 | ||
5a0a2f30 | 620 | pm_prepare_console(); |
b10d9117 RW |
621 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
622 | if (error) | |
623 | goto Exit; | |
0709db60 | 624 | |
1bfcf130 RW |
625 | error = usermodehelper_disable(); |
626 | if (error) | |
627 | goto Exit; | |
628 | ||
0709db60 RW |
629 | /* Allocate memory management structures */ |
630 | error = create_basic_memory_bitmaps(); | |
631 | if (error) | |
632 | goto Exit; | |
633 | ||
23976728 | 634 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
635 | sys_sync(); |
636 | printk("done.\n"); | |
637 | ||
1da177e4 | 638 | error = prepare_processes(); |
5a72e04d | 639 | if (error) |
0709db60 | 640 | goto Finish; |
1da177e4 | 641 | |
4cc79776 | 642 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 643 | goto Thaw; |
4cc79776 RW |
644 | |
645 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
646 | goto Thaw; | |
647 | ||
7777fab9 | 648 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
64a473cb RW |
649 | if (error) |
650 | goto Thaw; | |
651 | ||
652 | if (in_suspend) { | |
a634cc10 RW |
653 | unsigned int flags = 0; |
654 | ||
655 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
656 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
657 | if (nocompress) |
658 | flags |= SF_NOCOMPRESS_MODE; | |
1da177e4 | 659 | pr_debug("PM: writing image.\n"); |
a634cc10 | 660 | error = swsusp_write(flags); |
7777fab9 | 661 | swsusp_free(); |
1da177e4 | 662 | if (!error) |
fe0c935a | 663 | power_down(); |
5262a475 | 664 | in_suspend = 0; |
c9e664f1 | 665 | pm_restore_gfp_mask(); |
b918f6e6 | 666 | } else { |
1da177e4 | 667 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 668 | } |
64a473cb | 669 | |
b918f6e6 | 670 | Thaw: |
5a0a2f30 | 671 | thaw_processes(); |
0709db60 RW |
672 | Finish: |
673 | free_basic_memory_bitmaps(); | |
1bfcf130 | 674 | usermodehelper_enable(); |
0709db60 | 675 | Exit: |
b10d9117 | 676 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 677 | pm_restore_console(); |
0709db60 | 678 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
679 | Unlock: |
680 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
681 | return error; |
682 | } | |
683 | ||
684 | ||
685 | /** | |
f42a9813 RW |
686 | * software_resume - Resume from a saved hibernation image. |
687 | * | |
688 | * This routine is called as a late initcall, when all devices have been | |
689 | * discovered and initialized already. | |
1da177e4 | 690 | * |
f42a9813 RW |
691 | * The image reading code is called to see if there is a hibernation image |
692 | * available for reading. If that is the case, devices are quiesced and the | |
693 | * contents of memory is restored from the saved image. | |
1da177e4 | 694 | * |
f42a9813 RW |
695 | * If this is successful, control reappears in the restored target kernel in |
696 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
697 | * attempts to recover gracefully and make the kernel return to the normal mode | |
698 | * of operation. | |
1da177e4 | 699 | */ |
1da177e4 LT |
700 | static int software_resume(void) |
701 | { | |
702 | int error; | |
a634cc10 | 703 | unsigned int flags; |
1da177e4 | 704 | |
eed3ee08 AV |
705 | /* |
706 | * If the user said "noresume".. bail out early. | |
707 | */ | |
708 | if (noresume) | |
709 | return 0; | |
710 | ||
60a0d233 JB |
711 | /* |
712 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
713 | * is configured into the kernel. Since the regular hibernate | |
714 | * trigger path is via sysfs which takes a buffer mutex before | |
715 | * calling hibernate functions (which take pm_mutex) this can | |
716 | * cause lockdep to complain about a possible ABBA deadlock | |
717 | * which cannot happen since we're in the boot code here and | |
718 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
719 | * here to avoid lockdep complaining. | |
720 | */ | |
721 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
722 | |
723 | if (swsusp_resume_device) | |
724 | goto Check_image; | |
725 | ||
726 | if (!strlen(resume_file)) { | |
727 | error = -ENOENT; | |
728 | goto Unlock; | |
729 | } | |
730 | ||
d0941ead | 731 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 RW |
732 | |
733 | /* Check if the device is there */ | |
734 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 735 | if (!swsusp_resume_device) { |
eed3ee08 AV |
736 | /* |
737 | * Some device discovery might still be in progress; we need | |
738 | * to wait for this to finish. | |
739 | */ | |
740 | wait_for_device_probe(); | |
6f8d7022 BS |
741 | |
742 | if (resume_wait) { | |
743 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
744 | msleep(10); | |
745 | async_synchronize_full(); | |
746 | } | |
747 | ||
0c8454f5 RW |
748 | /* |
749 | * We can't depend on SCSI devices being available after loading | |
750 | * one of their modules until scsi_complete_async_scans() is | |
751 | * called and the resume device usually is a SCSI one. | |
752 | */ | |
753 | scsi_complete_async_scans(); | |
754 | ||
3efa147a | 755 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
756 | if (!swsusp_resume_device) { |
757 | error = -ENODEV; | |
758 | goto Unlock; | |
759 | } | |
3efa147a PM |
760 | } |
761 | ||
0c8454f5 | 762 | Check_image: |
d0941ead | 763 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 764 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 765 | |
d0941ead | 766 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
767 | error = swsusp_check(); |
768 | if (error) | |
74dfd666 | 769 | goto Unlock; |
1da177e4 | 770 | |
0709db60 RW |
771 | /* The snapshot device should not be opened while we're running */ |
772 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
773 | error = -EBUSY; | |
76b57e61 | 774 | swsusp_close(FMODE_READ); |
0709db60 RW |
775 | goto Unlock; |
776 | } | |
777 | ||
5a0a2f30 | 778 | pm_prepare_console(); |
c3e94d89 AS |
779 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
780 | if (error) | |
76b57e61 | 781 | goto close_finish; |
c3e94d89 | 782 | |
1bfcf130 RW |
783 | error = usermodehelper_disable(); |
784 | if (error) | |
76b57e61 | 785 | goto close_finish; |
1bfcf130 | 786 | |
74dfd666 RW |
787 | error = create_basic_memory_bitmaps(); |
788 | if (error) | |
76b57e61 | 789 | goto close_finish; |
1da177e4 | 790 | |
74dfd666 | 791 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
792 | error = prepare_processes(); |
793 | if (error) { | |
c2dd0dae | 794 | swsusp_close(FMODE_READ); |
5a72e04d | 795 | goto Done; |
1da177e4 LT |
796 | } |
797 | ||
d0941ead | 798 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 799 | |
a634cc10 | 800 | error = swsusp_read(&flags); |
76b57e61 | 801 | swsusp_close(FMODE_READ); |
ed746e3b | 802 | if (!error) |
a634cc10 | 803 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 804 | |
d0941ead | 805 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 806 | swsusp_free(); |
5a0a2f30 | 807 | thaw_processes(); |
1da177e4 | 808 | Done: |
74dfd666 | 809 | free_basic_memory_bitmaps(); |
1bfcf130 | 810 | usermodehelper_enable(); |
0709db60 | 811 | Finish: |
c3e94d89 | 812 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 813 | pm_restore_console(); |
0709db60 | 814 | atomic_inc(&snapshot_device_available); |
dd5d666b | 815 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 816 | Unlock: |
a6d70980 | 817 | mutex_unlock(&pm_mutex); |
d0941ead | 818 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 819 | return error; |
76b57e61 JS |
820 | close_finish: |
821 | swsusp_close(FMODE_READ); | |
822 | goto Finish; | |
1da177e4 LT |
823 | } |
824 | ||
825 | late_initcall(software_resume); | |
826 | ||
827 | ||
a3d25c27 RW |
828 | static const char * const hibernation_modes[] = { |
829 | [HIBERNATION_PLATFORM] = "platform", | |
830 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
831 | [HIBERNATION_REBOOT] = "reboot", | |
832 | [HIBERNATION_TEST] = "test", | |
833 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
834 | }; |
835 | ||
f42a9813 RW |
836 | /* |
837 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 838 | * |
f42a9813 RW |
839 | * Hibernation can be handled in several ways. There are a few different ways |
840 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
841 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
842 | * mostly), or using one of the two available test modes. | |
1da177e4 | 843 | * |
f42a9813 RW |
844 | * The sysfs file /sys/power/disk provides an interface for selecting the |
845 | * hibernation mode to use. Reading from this file causes the available modes | |
846 | * to be printed. There are 5 modes that can be supported: | |
1da177e4 | 847 | * |
1da177e4 LT |
848 | * 'platform' |
849 | * 'shutdown' | |
850 | * 'reboot' | |
11d77d0c JB |
851 | * 'test' |
852 | * 'testproc' | |
1da177e4 | 853 | * |
f42a9813 RW |
854 | * If a platform hibernation driver is in use, 'platform' will be supported |
855 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
856 | * The selected option (i.e. the one corresponding to the current value of | |
857 | * hibernation_mode) is enclosed by a square bracket. | |
858 | * | |
859 | * To select a given hibernation mode it is necessary to write the mode's | |
860 | * string representation (as returned by reading from /sys/power/disk) back | |
861 | * into /sys/power/disk. | |
1da177e4 LT |
862 | */ |
863 | ||
386f275f KS |
864 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
865 | char *buf) | |
1da177e4 | 866 | { |
f0ced9b2 JB |
867 | int i; |
868 | char *start = buf; | |
869 | ||
a3d25c27 RW |
870 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
871 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
872 | continue; |
873 | switch (i) { | |
a3d25c27 RW |
874 | case HIBERNATION_SHUTDOWN: |
875 | case HIBERNATION_REBOOT: | |
876 | case HIBERNATION_TEST: | |
877 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 878 | break; |
a3d25c27 RW |
879 | case HIBERNATION_PLATFORM: |
880 | if (hibernation_ops) | |
f0ced9b2 JB |
881 | break; |
882 | /* not a valid mode, continue with loop */ | |
883 | continue; | |
884 | } | |
a3d25c27 RW |
885 | if (i == hibernation_mode) |
886 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 887 | else |
a3d25c27 | 888 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
889 | } |
890 | buf += sprintf(buf, "\n"); | |
891 | return buf-start; | |
1da177e4 LT |
892 | } |
893 | ||
386f275f KS |
894 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
895 | const char *buf, size_t n) | |
1da177e4 LT |
896 | { |
897 | int error = 0; | |
898 | int i; | |
899 | int len; | |
900 | char *p; | |
a3d25c27 | 901 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
902 | |
903 | p = memchr(buf, '\n', n); | |
904 | len = p ? p - buf : n; | |
905 | ||
a6d70980 | 906 | mutex_lock(&pm_mutex); |
a3d25c27 | 907 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
908 | if (len == strlen(hibernation_modes[i]) |
909 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
910 | mode = i; |
911 | break; | |
912 | } | |
913 | } | |
a3d25c27 | 914 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 915 | switch (mode) { |
a3d25c27 RW |
916 | case HIBERNATION_SHUTDOWN: |
917 | case HIBERNATION_REBOOT: | |
918 | case HIBERNATION_TEST: | |
919 | case HIBERNATION_TESTPROC: | |
920 | hibernation_mode = mode; | |
fe0c935a | 921 | break; |
a3d25c27 RW |
922 | case HIBERNATION_PLATFORM: |
923 | if (hibernation_ops) | |
924 | hibernation_mode = mode; | |
1da177e4 LT |
925 | else |
926 | error = -EINVAL; | |
927 | } | |
a3d25c27 | 928 | } else |
1da177e4 LT |
929 | error = -EINVAL; |
930 | ||
a3d25c27 | 931 | if (!error) |
23976728 | 932 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 933 | hibernation_modes[mode]); |
a6d70980 | 934 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
935 | return error ? error : n; |
936 | } | |
937 | ||
938 | power_attr(disk); | |
939 | ||
386f275f KS |
940 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
941 | char *buf) | |
1da177e4 LT |
942 | { |
943 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
944 | MINOR(swsusp_resume_device)); | |
945 | } | |
946 | ||
386f275f KS |
947 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
948 | const char *buf, size_t n) | |
1da177e4 | 949 | { |
1da177e4 | 950 | unsigned int maj, min; |
1da177e4 | 951 | dev_t res; |
a576219a | 952 | int ret = -EINVAL; |
1da177e4 | 953 | |
a576219a AM |
954 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
955 | goto out; | |
1da177e4 | 956 | |
a576219a AM |
957 | res = MKDEV(maj,min); |
958 | if (maj != MAJOR(res) || min != MINOR(res)) | |
959 | goto out; | |
1da177e4 | 960 | |
a6d70980 | 961 | mutex_lock(&pm_mutex); |
a576219a | 962 | swsusp_resume_device = res; |
a6d70980 | 963 | mutex_unlock(&pm_mutex); |
23976728 | 964 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
965 | noresume = 0; |
966 | software_resume(); | |
967 | ret = n; | |
59a49335 | 968 | out: |
a576219a | 969 | return ret; |
1da177e4 LT |
970 | } |
971 | ||
972 | power_attr(resume); | |
973 | ||
386f275f KS |
974 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
975 | char *buf) | |
ca0aec0f | 976 | { |
853609b6 | 977 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
978 | } |
979 | ||
386f275f KS |
980 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
981 | const char *buf, size_t n) | |
ca0aec0f | 982 | { |
853609b6 | 983 | unsigned long size; |
ca0aec0f | 984 | |
853609b6 | 985 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
986 | image_size = size; |
987 | return n; | |
988 | } | |
989 | ||
990 | return -EINVAL; | |
991 | } | |
992 | ||
993 | power_attr(image_size); | |
994 | ||
ddeb6487 RW |
995 | static ssize_t reserved_size_show(struct kobject *kobj, |
996 | struct kobj_attribute *attr, char *buf) | |
997 | { | |
998 | return sprintf(buf, "%lu\n", reserved_size); | |
999 | } | |
1000 | ||
1001 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1002 | struct kobj_attribute *attr, | |
1003 | const char *buf, size_t n) | |
1004 | { | |
1005 | unsigned long size; | |
1006 | ||
1007 | if (sscanf(buf, "%lu", &size) == 1) { | |
1008 | reserved_size = size; | |
1009 | return n; | |
1010 | } | |
1011 | ||
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | power_attr(reserved_size); | |
1016 | ||
1da177e4 LT |
1017 | static struct attribute * g[] = { |
1018 | &disk_attr.attr, | |
1019 | &resume_attr.attr, | |
ca0aec0f | 1020 | &image_size_attr.attr, |
ddeb6487 | 1021 | &reserved_size_attr.attr, |
1da177e4 LT |
1022 | NULL, |
1023 | }; | |
1024 | ||
1025 | ||
1026 | static struct attribute_group attr_group = { | |
1027 | .attrs = g, | |
1028 | }; | |
1029 | ||
1030 | ||
1031 | static int __init pm_disk_init(void) | |
1032 | { | |
d76e15fb | 1033 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | core_initcall(pm_disk_init); | |
1037 | ||
1038 | ||
1039 | static int __init resume_setup(char *str) | |
1040 | { | |
1041 | if (noresume) | |
1042 | return 1; | |
1043 | ||
1044 | strncpy( resume_file, str, 255 ); | |
1045 | return 1; | |
1046 | } | |
1047 | ||
9a154d9d RW |
1048 | static int __init resume_offset_setup(char *str) |
1049 | { | |
1050 | unsigned long long offset; | |
1051 | ||
1052 | if (noresume) | |
1053 | return 1; | |
1054 | ||
1055 | if (sscanf(str, "%llu", &offset) == 1) | |
1056 | swsusp_resume_block = offset; | |
1057 | ||
1058 | return 1; | |
1059 | } | |
1060 | ||
f996fc96 BS |
1061 | static int __init hibernate_setup(char *str) |
1062 | { | |
1063 | if (!strncmp(str, "noresume", 8)) | |
1064 | noresume = 1; | |
1065 | else if (!strncmp(str, "nocompress", 10)) | |
1066 | nocompress = 1; | |
1067 | return 1; | |
1068 | } | |
1069 | ||
1da177e4 LT |
1070 | static int __init noresume_setup(char *str) |
1071 | { | |
1072 | noresume = 1; | |
1073 | return 1; | |
1074 | } | |
1075 | ||
6f8d7022 BS |
1076 | static int __init resumewait_setup(char *str) |
1077 | { | |
1078 | resume_wait = 1; | |
1079 | return 1; | |
1080 | } | |
1081 | ||
1da177e4 | 1082 | __setup("noresume", noresume_setup); |
9a154d9d | 1083 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1084 | __setup("resume=", resume_setup); |
f996fc96 | 1085 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1086 | __setup("resumewait", resumewait_setup); |