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 | ||
d231ff1a BS |
33 | static int nocompress; |
34 | static int noresume; | |
35 | static int resume_wait; | |
36 | static int resume_delay; | |
47a460d5 | 37 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 38 | dev_t swsusp_resume_device; |
9a154d9d | 39 | sector_t swsusp_resume_block; |
d231ff1a | 40 | int in_suspend __nosavedata; |
1da177e4 | 41 | |
a3d25c27 RW |
42 | enum { |
43 | HIBERNATION_INVALID, | |
44 | HIBERNATION_PLATFORM, | |
45 | HIBERNATION_TEST, | |
46 | HIBERNATION_TESTPROC, | |
47 | HIBERNATION_SHUTDOWN, | |
48 | HIBERNATION_REBOOT, | |
49 | /* keep last */ | |
50 | __HIBERNATION_AFTER_LAST | |
51 | }; | |
52 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
53 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
54 | ||
55 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
56 | ||
073ef1f6 | 57 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
58 | |
59 | /** | |
f42a9813 RW |
60 | * hibernation_set_ops - Set the global hibernate operations. |
61 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 62 | */ |
073ef1f6 | 63 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 64 | { |
caea99ef RW |
65 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
66 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 67 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
68 | WARN_ON(1); |
69 | return; | |
70 | } | |
71 | mutex_lock(&pm_mutex); | |
72 | hibernation_ops = ops; | |
73 | if (ops) | |
74 | hibernation_mode = HIBERNATION_PLATFORM; | |
75 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
76 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
77 | ||
78 | mutex_unlock(&pm_mutex); | |
79 | } | |
80 | ||
abfe2d7b RW |
81 | static bool entering_platform_hibernation; |
82 | ||
83 | bool system_entering_hibernation(void) | |
84 | { | |
85 | return entering_platform_hibernation; | |
86 | } | |
87 | EXPORT_SYMBOL(system_entering_hibernation); | |
88 | ||
4cc79776 RW |
89 | #ifdef CONFIG_PM_DEBUG |
90 | static void hibernation_debug_sleep(void) | |
91 | { | |
92 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
93 | mdelay(5000); | |
94 | } | |
95 | ||
96 | static int hibernation_testmode(int mode) | |
97 | { | |
98 | if (hibernation_mode == mode) { | |
99 | hibernation_debug_sleep(); | |
100 | return 1; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int hibernation_test(int level) | |
106 | { | |
107 | if (pm_test_level == level) { | |
108 | hibernation_debug_sleep(); | |
109 | return 1; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | #else /* !CONFIG_PM_DEBUG */ | |
114 | static int hibernation_testmode(int mode) { return 0; } | |
115 | static int hibernation_test(int level) { return 0; } | |
116 | #endif /* !CONFIG_PM_DEBUG */ | |
117 | ||
74f270af | 118 | /** |
f42a9813 RW |
119 | * platform_begin - Call platform to start hibernation. |
120 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 121 | */ |
caea99ef | 122 | static int platform_begin(int platform_mode) |
74f270af RW |
123 | { |
124 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
125 | hibernation_ops->begin() : 0; |
126 | } | |
127 | ||
128 | /** | |
f42a9813 RW |
129 | * platform_end - Call platform to finish transition to the working state. |
130 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 131 | */ |
caea99ef RW |
132 | static void platform_end(int platform_mode) |
133 | { | |
134 | if (platform_mode && hibernation_ops) | |
135 | hibernation_ops->end(); | |
74f270af | 136 | } |
a3d25c27 | 137 | |
8a05aac2 | 138 | /** |
f42a9813 RW |
139 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
140 | * @platform_mode: Whether or not to use the platform driver. | |
141 | * | |
142 | * Use the platform driver to prepare the system for creating a hibernate image, | |
143 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
144 | */ |
145 | ||
74f270af | 146 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 147 | { |
7777fab9 | 148 | return (platform_mode && hibernation_ops) ? |
74f270af | 149 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 150 | } |
8a05aac2 | 151 | |
c7e0831d | 152 | /** |
f42a9813 RW |
153 | * platform_leave - Call platform to prepare a transition to the working state. |
154 | * @platform_mode: Whether or not to use the platform driver. | |
155 | * | |
156 | * Use the platform driver prepare to prepare the machine for switching to the | |
157 | * normal mode of operation. | |
158 | * | |
159 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 160 | */ |
c7e0831d RW |
161 | static void platform_leave(int platform_mode) |
162 | { | |
163 | if (platform_mode && hibernation_ops) | |
164 | hibernation_ops->leave(); | |
165 | } | |
166 | ||
a3d25c27 | 167 | /** |
f42a9813 RW |
168 | * platform_finish - Call platform to switch the system to the working state. |
169 | * @platform_mode: Whether or not to use the platform driver. | |
170 | * | |
171 | * Use the platform driver to switch the machine to the normal mode of | |
172 | * operation. | |
173 | * | |
174 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 175 | */ |
7777fab9 | 176 | static void platform_finish(int platform_mode) |
a3d25c27 | 177 | { |
7777fab9 | 178 | if (platform_mode && hibernation_ops) |
a3d25c27 | 179 | hibernation_ops->finish(); |
8a05aac2 SS |
180 | } |
181 | ||
a634cc10 | 182 | /** |
f42a9813 RW |
183 | * platform_pre_restore - Prepare for hibernate image restoration. |
184 | * @platform_mode: Whether or not to use the platform driver. | |
185 | * | |
186 | * Use the platform driver to prepare the system for resume from a hibernation | |
187 | * image. | |
188 | * | |
189 | * If the restore fails after this function has been called, | |
190 | * platform_restore_cleanup() must be called. | |
a634cc10 | 191 | */ |
a634cc10 RW |
192 | static int platform_pre_restore(int platform_mode) |
193 | { | |
194 | return (platform_mode && hibernation_ops) ? | |
195 | hibernation_ops->pre_restore() : 0; | |
196 | } | |
197 | ||
198 | /** | |
f42a9813 RW |
199 | * platform_restore_cleanup - Switch to the working state after failing restore. |
200 | * @platform_mode: Whether or not to use the platform driver. | |
201 | * | |
202 | * Use the platform driver to switch the system to the normal mode of operation | |
203 | * after a failing restore. | |
204 | * | |
205 | * If platform_pre_restore() has been called before the failing restore, this | |
206 | * function must be called too, regardless of the result of | |
207 | * platform_pre_restore(). | |
a634cc10 | 208 | */ |
a634cc10 RW |
209 | static void platform_restore_cleanup(int platform_mode) |
210 | { | |
211 | if (platform_mode && hibernation_ops) | |
212 | hibernation_ops->restore_cleanup(); | |
213 | } | |
214 | ||
d8f3de0d | 215 | /** |
f42a9813 RW |
216 | * platform_recover - Recover from a failure to suspend devices. |
217 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 218 | */ |
d8f3de0d RW |
219 | static void platform_recover(int platform_mode) |
220 | { | |
221 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
222 | hibernation_ops->recover(); | |
223 | } | |
224 | ||
8e60c6a1 | 225 | /** |
f42a9813 RW |
226 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
227 | * @start: Starting event. | |
228 | * @stop: Final event. | |
229 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
230 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 231 | */ |
8e60c6a1 NC |
232 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
233 | unsigned nr_pages, char *msg) | |
234 | { | |
235 | s64 elapsed_centisecs64; | |
236 | int centisecs; | |
237 | int k; | |
238 | int kps; | |
239 | ||
240 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
241 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
242 | centisecs = elapsed_centisecs64; | |
243 | if (centisecs == 0) | |
244 | centisecs = 1; /* avoid div-by-zero */ | |
245 | k = nr_pages * (PAGE_SIZE / 1024); | |
246 | kps = (k * 100) / centisecs; | |
247 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
248 | msg, k, | |
249 | centisecs / 100, centisecs % 100, | |
250 | kps / 1000, (kps % 1000) / 10); | |
251 | } | |
252 | ||
c7e0831d | 253 | /** |
f42a9813 RW |
254 | * create_image - Create a hibernation image. |
255 | * @platform_mode: Whether or not to use the platform driver. | |
256 | * | |
257 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image | |
258 | * and execute the drivers' .thaw_noirq() callbacks. | |
259 | * | |
260 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 261 | */ |
47a460d5 | 262 | static int create_image(int platform_mode) |
c7e0831d RW |
263 | { |
264 | int error; | |
265 | ||
d1616302 | 266 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 267 | if (error) { |
23976728 RW |
268 | printk(KERN_ERR "PM: Some devices failed to power down, " |
269 | "aborting hibernation\n"); | |
32bdfac5 | 270 | return error; |
c7e0831d | 271 | } |
2ed8d2b3 | 272 | |
4aecd671 RW |
273 | error = platform_pre_snapshot(platform_mode); |
274 | if (error || hibernation_test(TEST_PLATFORM)) | |
275 | goto Platform_finish; | |
276 | ||
277 | error = disable_nonboot_cpus(); | |
278 | if (error || hibernation_test(TEST_CPUS) | |
279 | || hibernation_testmode(HIBERNATION_TEST)) | |
280 | goto Enable_cpus; | |
281 | ||
2ed8d2b3 RW |
282 | local_irq_disable(); |
283 | ||
2e711c04 | 284 | error = syscore_suspend(); |
770824bd | 285 | if (error) { |
4484079d | 286 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 287 | "aborting hibernation\n"); |
4aecd671 | 288 | goto Enable_irqs; |
770824bd | 289 | } |
c7e0831d | 290 | |
a2867e08 | 291 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
292 | goto Power_up; |
293 | ||
294 | in_suspend = 1; | |
c7e0831d RW |
295 | save_processor_state(); |
296 | error = swsusp_arch_suspend(); | |
297 | if (error) | |
23976728 RW |
298 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
299 | error); | |
c7e0831d RW |
300 | /* Restore control flow magically appears here */ |
301 | restore_processor_state(); | |
c125e96f RW |
302 | if (!in_suspend) { |
303 | events_check_enabled = false; | |
c7e0831d | 304 | platform_leave(platform_mode); |
c125e96f | 305 | } |
4aecd671 | 306 | |
4cc79776 | 307 | Power_up: |
40dc166c | 308 | syscore_resume(); |
2ed8d2b3 | 309 | |
4aecd671 | 310 | Enable_irqs: |
2ed8d2b3 RW |
311 | local_irq_enable(); |
312 | ||
4aecd671 RW |
313 | Enable_cpus: |
314 | enable_nonboot_cpus(); | |
315 | ||
316 | Platform_finish: | |
317 | platform_finish(platform_mode); | |
318 | ||
d1616302 | 319 | dpm_resume_noirq(in_suspend ? |
1eede070 | 320 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 321 | |
c7e0831d RW |
322 | return error; |
323 | } | |
324 | ||
7777fab9 | 325 | /** |
f42a9813 RW |
326 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
327 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 328 | * |
f42a9813 | 329 | * This routine must be called with pm_mutex held. |
7777fab9 | 330 | */ |
7777fab9 RW |
331 | int hibernation_snapshot(int platform_mode) |
332 | { | |
91e7c75b | 333 | pm_message_t msg = PMSG_RECOVER; |
cbe2f5a6 | 334 | int error; |
7777fab9 | 335 | |
3fe0313e | 336 | error = platform_begin(platform_mode); |
7777fab9 | 337 | if (error) |
d074ee02 | 338 | goto Close; |
7777fab9 | 339 | |
64a473cb RW |
340 | /* Preallocate image memory before shutting down devices. */ |
341 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
342 | if (error) |
343 | goto Close; | |
344 | ||
345 | error = freeze_kernel_threads(); | |
346 | if (error) | |
347 | goto Close; | |
348 | ||
349 | error = dpm_prepare(PMSG_FREEZE); | |
74f270af | 350 | if (error) |
91e7c75b | 351 | goto Complete_devices; |
74f270af | 352 | |
7777fab9 | 353 | suspend_console(); |
c9e664f1 | 354 | pm_restrict_gfp_mask(); |
91e7c75b | 355 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 356 | if (error) |
d8f3de0d | 357 | goto Recover_platform; |
10a1803d | 358 | |
4cc79776 | 359 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 360 | goto Recover_platform; |
7777fab9 | 361 | |
4aecd671 | 362 | error = create_image(platform_mode); |
c9e664f1 RW |
363 | /* |
364 | * Control returns here (1) after the image has been created or the | |
365 | * image creation has failed and (2) after a successful restore. | |
366 | */ | |
4cc79776 | 367 | |
4cc79776 | 368 | Resume_devices: |
64a473cb RW |
369 | /* We may need to release the preallocated image pages here. */ |
370 | if (error || !in_suspend) | |
371 | swsusp_free(); | |
372 | ||
91e7c75b RW |
373 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
374 | dpm_resume(msg); | |
c9e664f1 RW |
375 | |
376 | if (error || !in_suspend) | |
377 | pm_restore_gfp_mask(); | |
378 | ||
7777fab9 | 379 | resume_console(); |
91e7c75b RW |
380 | |
381 | Complete_devices: | |
382 | dpm_complete(msg); | |
383 | ||
caea99ef RW |
384 | Close: |
385 | platform_end(platform_mode); | |
7777fab9 | 386 | return error; |
d8f3de0d RW |
387 | |
388 | Recover_platform: | |
389 | platform_recover(platform_mode); | |
390 | goto Resume_devices; | |
7777fab9 RW |
391 | } |
392 | ||
72df68ca | 393 | /** |
f42a9813 RW |
394 | * resume_target_kernel - Restore system state from a hibernation image. |
395 | * @platform_mode: Whether or not to use the platform driver. | |
396 | * | |
397 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of | |
398 | * highmem that have not been restored yet from the image and run the low-level | |
399 | * code that will restore the remaining contents of memory and switch to the | |
400 | * just restored target kernel. | |
72df68ca | 401 | */ |
4aecd671 | 402 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
403 | { |
404 | int error; | |
405 | ||
d1616302 | 406 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 407 | if (error) { |
23976728 | 408 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 409 | "aborting resume\n"); |
32bdfac5 | 410 | return error; |
72df68ca | 411 | } |
2ed8d2b3 | 412 | |
4aecd671 RW |
413 | error = platform_pre_restore(platform_mode); |
414 | if (error) | |
415 | goto Cleanup; | |
416 | ||
417 | error = disable_nonboot_cpus(); | |
418 | if (error) | |
419 | goto Enable_cpus; | |
420 | ||
2ed8d2b3 RW |
421 | local_irq_disable(); |
422 | ||
2e711c04 | 423 | error = syscore_suspend(); |
4aecd671 RW |
424 | if (error) |
425 | goto Enable_irqs; | |
426 | ||
72df68ca RW |
427 | save_processor_state(); |
428 | error = restore_highmem(); | |
429 | if (!error) { | |
430 | error = swsusp_arch_resume(); | |
431 | /* | |
432 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
433 | * Otherwise, execution continues at the place where |
434 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
435 | */ |
436 | BUG_ON(!error); | |
4e2d9491 RW |
437 | /* |
438 | * This call to restore_highmem() reverts the changes made by | |
439 | * the previous one. | |
440 | */ | |
72df68ca RW |
441 | restore_highmem(); |
442 | } | |
443 | /* | |
444 | * The only reason why swsusp_arch_resume() can fail is memory being | |
445 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 446 | * subsequent failures. |
72df68ca RW |
447 | */ |
448 | swsusp_free(); | |
449 | restore_processor_state(); | |
450 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 451 | |
40dc166c | 452 | syscore_resume(); |
2ed8d2b3 | 453 | |
4aecd671 | 454 | Enable_irqs: |
72df68ca | 455 | local_irq_enable(); |
2ed8d2b3 | 456 | |
4aecd671 RW |
457 | Enable_cpus: |
458 | enable_nonboot_cpus(); | |
459 | ||
460 | Cleanup: | |
461 | platform_restore_cleanup(platform_mode); | |
462 | ||
d1616302 | 463 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 464 | |
72df68ca RW |
465 | return error; |
466 | } | |
467 | ||
7777fab9 | 468 | /** |
f42a9813 RW |
469 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
470 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 471 | * |
f42a9813 | 472 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 473 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 474 | */ |
a634cc10 | 475 | int hibernation_restore(int platform_mode) |
7777fab9 | 476 | { |
cbe2f5a6 | 477 | int error; |
7777fab9 RW |
478 | |
479 | pm_prepare_console(); | |
480 | suspend_console(); | |
c9e664f1 | 481 | pm_restrict_gfp_mask(); |
d1616302 | 482 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 483 | if (!error) { |
4aecd671 | 484 | error = resume_target_kernel(platform_mode); |
d1616302 | 485 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 486 | } |
c9e664f1 | 487 | pm_restore_gfp_mask(); |
7777fab9 RW |
488 | resume_console(); |
489 | pm_restore_console(); | |
490 | return error; | |
491 | } | |
492 | ||
493 | /** | |
f42a9813 | 494 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 495 | */ |
7777fab9 RW |
496 | int hibernation_platform_enter(void) |
497 | { | |
cbe2f5a6 | 498 | int error; |
b1457bcc | 499 | |
9cd9a005 RW |
500 | if (!hibernation_ops) |
501 | return -ENOSYS; | |
502 | ||
503 | /* | |
504 | * We have cancelled the power transition by running | |
505 | * hibernation_ops->finish() before saving the image, so we should let | |
506 | * the firmware know that we're going to enter the sleep state after all | |
507 | */ | |
caea99ef | 508 | error = hibernation_ops->begin(); |
9cd9a005 | 509 | if (error) |
caea99ef | 510 | goto Close; |
9cd9a005 | 511 | |
abfe2d7b | 512 | entering_platform_hibernation = true; |
9cd9a005 | 513 | suspend_console(); |
d1616302 | 514 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
515 | if (error) { |
516 | if (hibernation_ops->recover) | |
517 | hibernation_ops->recover(); | |
518 | goto Resume_devices; | |
519 | } | |
9cd9a005 | 520 | |
d1616302 | 521 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 522 | if (error) |
32bdfac5 | 523 | goto Resume_devices; |
4aecd671 | 524 | |
9cd9a005 RW |
525 | error = hibernation_ops->prepare(); |
526 | if (error) | |
e681c9dd | 527 | goto Platform_finish; |
9cd9a005 RW |
528 | |
529 | error = disable_nonboot_cpus(); | |
530 | if (error) | |
e681c9dd | 531 | goto Platform_finish; |
2ed8d2b3 | 532 | |
4aecd671 | 533 | local_irq_disable(); |
40dc166c | 534 | syscore_suspend(); |
a2867e08 | 535 | if (pm_wakeup_pending()) { |
c125e96f RW |
536 | error = -EAGAIN; |
537 | goto Power_up; | |
538 | } | |
539 | ||
4aecd671 RW |
540 | hibernation_ops->enter(); |
541 | /* We should never get here */ | |
542 | while (1); | |
9cd9a005 | 543 | |
c125e96f | 544 | Power_up: |
40dc166c | 545 | syscore_resume(); |
c125e96f RW |
546 | local_irq_enable(); |
547 | enable_nonboot_cpus(); | |
548 | ||
e681c9dd | 549 | Platform_finish: |
9cd9a005 | 550 | hibernation_ops->finish(); |
2ed8d2b3 | 551 | |
f6f71f18 | 552 | dpm_resume_noirq(PMSG_RESTORE); |
4aecd671 | 553 | |
9cd9a005 | 554 | Resume_devices: |
abfe2d7b | 555 | entering_platform_hibernation = false; |
d1616302 | 556 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 557 | resume_console(); |
2ed8d2b3 | 558 | |
caea99ef RW |
559 | Close: |
560 | hibernation_ops->end(); | |
2ed8d2b3 | 561 | |
b1457bcc | 562 | return error; |
7777fab9 RW |
563 | } |
564 | ||
1da177e4 | 565 | /** |
f42a9813 | 566 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 567 | * |
f42a9813 RW |
568 | * Use the platform driver, if configured, to put the system into the sleep |
569 | * state corresponding to hibernation, or try to power it off or reboot, | |
570 | * depending on the value of hibernation_mode. | |
1da177e4 | 571 | */ |
fe0c935a | 572 | static void power_down(void) |
1da177e4 | 573 | { |
a3d25c27 RW |
574 | switch (hibernation_mode) { |
575 | case HIBERNATION_TEST: | |
576 | case HIBERNATION_TESTPROC: | |
fe0c935a | 577 | break; |
a3d25c27 | 578 | case HIBERNATION_REBOOT: |
fdde86ac | 579 | kernel_restart(NULL); |
1da177e4 | 580 | break; |
a3d25c27 | 581 | case HIBERNATION_PLATFORM: |
7777fab9 | 582 | hibernation_platform_enter(); |
9cd9a005 RW |
583 | case HIBERNATION_SHUTDOWN: |
584 | kernel_power_off(); | |
585 | break; | |
1da177e4 | 586 | } |
fdde86ac | 587 | kernel_halt(); |
fe0c935a JB |
588 | /* |
589 | * Valid image is on the disk, if we continue we risk serious data | |
590 | * corruption after resume. | |
591 | */ | |
23976728 | 592 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
593 | while(1); |
594 | } | |
595 | ||
1da177e4 LT |
596 | static int prepare_processes(void) |
597 | { | |
b918f6e6 | 598 | int error = 0; |
1da177e4 | 599 | |
1da177e4 LT |
600 | if (freeze_processes()) { |
601 | error = -EBUSY; | |
5a0a2f30 | 602 | thaw_processes(); |
1da177e4 | 603 | } |
5a72e04d | 604 | return error; |
1da177e4 LT |
605 | } |
606 | ||
1da177e4 | 607 | /** |
f42a9813 | 608 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 609 | */ |
a3d25c27 | 610 | int hibernate(void) |
1da177e4 LT |
611 | { |
612 | int error; | |
613 | ||
b10d9117 | 614 | mutex_lock(&pm_mutex); |
0709db60 | 615 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
616 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
617 | error = -EBUSY; | |
618 | goto Unlock; | |
619 | } | |
620 | ||
5a0a2f30 | 621 | pm_prepare_console(); |
b10d9117 RW |
622 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
623 | if (error) | |
624 | goto Exit; | |
0709db60 | 625 | |
1bfcf130 RW |
626 | error = usermodehelper_disable(); |
627 | if (error) | |
628 | goto Exit; | |
629 | ||
0709db60 RW |
630 | /* Allocate memory management structures */ |
631 | error = create_basic_memory_bitmaps(); | |
632 | if (error) | |
633 | goto Exit; | |
634 | ||
23976728 | 635 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
636 | sys_sync(); |
637 | printk("done.\n"); | |
638 | ||
1da177e4 | 639 | error = prepare_processes(); |
5a72e04d | 640 | if (error) |
0709db60 | 641 | goto Finish; |
1da177e4 | 642 | |
4cc79776 | 643 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 644 | goto Thaw; |
4cc79776 RW |
645 | |
646 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
647 | goto Thaw; | |
648 | ||
7777fab9 | 649 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
64a473cb RW |
650 | if (error) |
651 | goto Thaw; | |
652 | ||
653 | if (in_suspend) { | |
a634cc10 RW |
654 | unsigned int flags = 0; |
655 | ||
656 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
657 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
658 | if (nocompress) |
659 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
660 | else |
661 | flags |= SF_CRC32_MODE; | |
662 | ||
1da177e4 | 663 | pr_debug("PM: writing image.\n"); |
a634cc10 | 664 | error = swsusp_write(flags); |
7777fab9 | 665 | swsusp_free(); |
1da177e4 | 666 | if (!error) |
fe0c935a | 667 | power_down(); |
5262a475 | 668 | in_suspend = 0; |
c9e664f1 | 669 | pm_restore_gfp_mask(); |
b918f6e6 | 670 | } else { |
1da177e4 | 671 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 672 | } |
64a473cb | 673 | |
b918f6e6 | 674 | Thaw: |
5a0a2f30 | 675 | thaw_processes(); |
0709db60 RW |
676 | Finish: |
677 | free_basic_memory_bitmaps(); | |
1bfcf130 | 678 | usermodehelper_enable(); |
0709db60 | 679 | Exit: |
b10d9117 | 680 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 681 | pm_restore_console(); |
0709db60 | 682 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
683 | Unlock: |
684 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
685 | return error; |
686 | } | |
687 | ||
688 | ||
689 | /** | |
f42a9813 RW |
690 | * software_resume - Resume from a saved hibernation image. |
691 | * | |
692 | * This routine is called as a late initcall, when all devices have been | |
693 | * discovered and initialized already. | |
1da177e4 | 694 | * |
f42a9813 RW |
695 | * The image reading code is called to see if there is a hibernation image |
696 | * available for reading. If that is the case, devices are quiesced and the | |
697 | * contents of memory is restored from the saved image. | |
1da177e4 | 698 | * |
f42a9813 RW |
699 | * If this is successful, control reappears in the restored target kernel in |
700 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
701 | * attempts to recover gracefully and make the kernel return to the normal mode | |
702 | * of operation. | |
1da177e4 | 703 | */ |
1da177e4 LT |
704 | static int software_resume(void) |
705 | { | |
706 | int error; | |
a634cc10 | 707 | unsigned int flags; |
1da177e4 | 708 | |
eed3ee08 AV |
709 | /* |
710 | * If the user said "noresume".. bail out early. | |
711 | */ | |
712 | if (noresume) | |
713 | return 0; | |
714 | ||
60a0d233 JB |
715 | /* |
716 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
717 | * is configured into the kernel. Since the regular hibernate | |
718 | * trigger path is via sysfs which takes a buffer mutex before | |
719 | * calling hibernate functions (which take pm_mutex) this can | |
720 | * cause lockdep to complain about a possible ABBA deadlock | |
721 | * which cannot happen since we're in the boot code here and | |
722 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
723 | * here to avoid lockdep complaining. | |
724 | */ | |
725 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
726 | |
727 | if (swsusp_resume_device) | |
728 | goto Check_image; | |
729 | ||
730 | if (!strlen(resume_file)) { | |
731 | error = -ENOENT; | |
732 | goto Unlock; | |
733 | } | |
734 | ||
d0941ead | 735 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 736 | |
f126f733 BS |
737 | if (resume_delay) { |
738 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
739 | resume_delay); | |
740 | ssleep(resume_delay); | |
741 | } | |
742 | ||
0c8454f5 RW |
743 | /* Check if the device is there */ |
744 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 745 | if (!swsusp_resume_device) { |
eed3ee08 AV |
746 | /* |
747 | * Some device discovery might still be in progress; we need | |
748 | * to wait for this to finish. | |
749 | */ | |
750 | wait_for_device_probe(); | |
6f8d7022 BS |
751 | |
752 | if (resume_wait) { | |
753 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
754 | msleep(10); | |
755 | async_synchronize_full(); | |
756 | } | |
757 | ||
0c8454f5 RW |
758 | /* |
759 | * We can't depend on SCSI devices being available after loading | |
760 | * one of their modules until scsi_complete_async_scans() is | |
761 | * called and the resume device usually is a SCSI one. | |
762 | */ | |
763 | scsi_complete_async_scans(); | |
764 | ||
3efa147a | 765 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
766 | if (!swsusp_resume_device) { |
767 | error = -ENODEV; | |
768 | goto Unlock; | |
769 | } | |
3efa147a PM |
770 | } |
771 | ||
0c8454f5 | 772 | Check_image: |
d0941ead | 773 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 774 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 775 | |
d0941ead | 776 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
777 | error = swsusp_check(); |
778 | if (error) | |
74dfd666 | 779 | goto Unlock; |
1da177e4 | 780 | |
0709db60 RW |
781 | /* The snapshot device should not be opened while we're running */ |
782 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
783 | error = -EBUSY; | |
76b57e61 | 784 | swsusp_close(FMODE_READ); |
0709db60 RW |
785 | goto Unlock; |
786 | } | |
787 | ||
5a0a2f30 | 788 | pm_prepare_console(); |
c3e94d89 AS |
789 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
790 | if (error) | |
76b57e61 | 791 | goto close_finish; |
c3e94d89 | 792 | |
1bfcf130 RW |
793 | error = usermodehelper_disable(); |
794 | if (error) | |
76b57e61 | 795 | goto close_finish; |
1bfcf130 | 796 | |
74dfd666 RW |
797 | error = create_basic_memory_bitmaps(); |
798 | if (error) | |
76b57e61 | 799 | goto close_finish; |
1da177e4 | 800 | |
74dfd666 | 801 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
802 | error = prepare_processes(); |
803 | if (error) { | |
c2dd0dae | 804 | swsusp_close(FMODE_READ); |
5a72e04d | 805 | goto Done; |
1da177e4 LT |
806 | } |
807 | ||
d0941ead | 808 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 809 | |
a634cc10 | 810 | error = swsusp_read(&flags); |
76b57e61 | 811 | swsusp_close(FMODE_READ); |
ed746e3b | 812 | if (!error) |
a634cc10 | 813 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 814 | |
d0941ead | 815 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 816 | swsusp_free(); |
5a0a2f30 | 817 | thaw_processes(); |
1da177e4 | 818 | Done: |
74dfd666 | 819 | free_basic_memory_bitmaps(); |
1bfcf130 | 820 | usermodehelper_enable(); |
0709db60 | 821 | Finish: |
c3e94d89 | 822 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 823 | pm_restore_console(); |
0709db60 | 824 | atomic_inc(&snapshot_device_available); |
dd5d666b | 825 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 826 | Unlock: |
a6d70980 | 827 | mutex_unlock(&pm_mutex); |
d0941ead | 828 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 829 | return error; |
76b57e61 JS |
830 | close_finish: |
831 | swsusp_close(FMODE_READ); | |
832 | goto Finish; | |
1da177e4 LT |
833 | } |
834 | ||
835 | late_initcall(software_resume); | |
836 | ||
837 | ||
a3d25c27 RW |
838 | static const char * const hibernation_modes[] = { |
839 | [HIBERNATION_PLATFORM] = "platform", | |
840 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
841 | [HIBERNATION_REBOOT] = "reboot", | |
842 | [HIBERNATION_TEST] = "test", | |
843 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
844 | }; |
845 | ||
f42a9813 RW |
846 | /* |
847 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 848 | * |
f42a9813 RW |
849 | * Hibernation can be handled in several ways. There are a few different ways |
850 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
851 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
852 | * mostly), or using one of the two available test modes. | |
1da177e4 | 853 | * |
f42a9813 RW |
854 | * The sysfs file /sys/power/disk provides an interface for selecting the |
855 | * hibernation mode to use. Reading from this file causes the available modes | |
856 | * to be printed. There are 5 modes that can be supported: | |
1da177e4 | 857 | * |
1da177e4 LT |
858 | * 'platform' |
859 | * 'shutdown' | |
860 | * 'reboot' | |
11d77d0c JB |
861 | * 'test' |
862 | * 'testproc' | |
1da177e4 | 863 | * |
f42a9813 RW |
864 | * If a platform hibernation driver is in use, 'platform' will be supported |
865 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
866 | * The selected option (i.e. the one corresponding to the current value of | |
867 | * hibernation_mode) is enclosed by a square bracket. | |
868 | * | |
869 | * To select a given hibernation mode it is necessary to write the mode's | |
870 | * string representation (as returned by reading from /sys/power/disk) back | |
871 | * into /sys/power/disk. | |
1da177e4 LT |
872 | */ |
873 | ||
386f275f KS |
874 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
875 | char *buf) | |
1da177e4 | 876 | { |
f0ced9b2 JB |
877 | int i; |
878 | char *start = buf; | |
879 | ||
a3d25c27 RW |
880 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
881 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
882 | continue; |
883 | switch (i) { | |
a3d25c27 RW |
884 | case HIBERNATION_SHUTDOWN: |
885 | case HIBERNATION_REBOOT: | |
886 | case HIBERNATION_TEST: | |
887 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 888 | break; |
a3d25c27 RW |
889 | case HIBERNATION_PLATFORM: |
890 | if (hibernation_ops) | |
f0ced9b2 JB |
891 | break; |
892 | /* not a valid mode, continue with loop */ | |
893 | continue; | |
894 | } | |
a3d25c27 RW |
895 | if (i == hibernation_mode) |
896 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 897 | else |
a3d25c27 | 898 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
899 | } |
900 | buf += sprintf(buf, "\n"); | |
901 | return buf-start; | |
1da177e4 LT |
902 | } |
903 | ||
386f275f KS |
904 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
905 | const char *buf, size_t n) | |
1da177e4 LT |
906 | { |
907 | int error = 0; | |
908 | int i; | |
909 | int len; | |
910 | char *p; | |
a3d25c27 | 911 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
912 | |
913 | p = memchr(buf, '\n', n); | |
914 | len = p ? p - buf : n; | |
915 | ||
a6d70980 | 916 | mutex_lock(&pm_mutex); |
a3d25c27 | 917 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
918 | if (len == strlen(hibernation_modes[i]) |
919 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
920 | mode = i; |
921 | break; | |
922 | } | |
923 | } | |
a3d25c27 | 924 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 925 | switch (mode) { |
a3d25c27 RW |
926 | case HIBERNATION_SHUTDOWN: |
927 | case HIBERNATION_REBOOT: | |
928 | case HIBERNATION_TEST: | |
929 | case HIBERNATION_TESTPROC: | |
930 | hibernation_mode = mode; | |
fe0c935a | 931 | break; |
a3d25c27 RW |
932 | case HIBERNATION_PLATFORM: |
933 | if (hibernation_ops) | |
934 | hibernation_mode = mode; | |
1da177e4 LT |
935 | else |
936 | error = -EINVAL; | |
937 | } | |
a3d25c27 | 938 | } else |
1da177e4 LT |
939 | error = -EINVAL; |
940 | ||
a3d25c27 | 941 | if (!error) |
23976728 | 942 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 943 | hibernation_modes[mode]); |
a6d70980 | 944 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
945 | return error ? error : n; |
946 | } | |
947 | ||
948 | power_attr(disk); | |
949 | ||
386f275f KS |
950 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
951 | char *buf) | |
1da177e4 LT |
952 | { |
953 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
954 | MINOR(swsusp_resume_device)); | |
955 | } | |
956 | ||
386f275f KS |
957 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
958 | const char *buf, size_t n) | |
1da177e4 | 959 | { |
1da177e4 | 960 | unsigned int maj, min; |
1da177e4 | 961 | dev_t res; |
a576219a | 962 | int ret = -EINVAL; |
1da177e4 | 963 | |
a576219a AM |
964 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
965 | goto out; | |
1da177e4 | 966 | |
a576219a AM |
967 | res = MKDEV(maj,min); |
968 | if (maj != MAJOR(res) || min != MINOR(res)) | |
969 | goto out; | |
1da177e4 | 970 | |
a6d70980 | 971 | mutex_lock(&pm_mutex); |
a576219a | 972 | swsusp_resume_device = res; |
a6d70980 | 973 | mutex_unlock(&pm_mutex); |
23976728 | 974 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
975 | noresume = 0; |
976 | software_resume(); | |
977 | ret = n; | |
59a49335 | 978 | out: |
a576219a | 979 | return ret; |
1da177e4 LT |
980 | } |
981 | ||
982 | power_attr(resume); | |
983 | ||
386f275f KS |
984 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
985 | char *buf) | |
ca0aec0f | 986 | { |
853609b6 | 987 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
988 | } |
989 | ||
386f275f KS |
990 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
991 | const char *buf, size_t n) | |
ca0aec0f | 992 | { |
853609b6 | 993 | unsigned long size; |
ca0aec0f | 994 | |
853609b6 | 995 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
996 | image_size = size; |
997 | return n; | |
998 | } | |
999 | ||
1000 | return -EINVAL; | |
1001 | } | |
1002 | ||
1003 | power_attr(image_size); | |
1004 | ||
ddeb6487 RW |
1005 | static ssize_t reserved_size_show(struct kobject *kobj, |
1006 | struct kobj_attribute *attr, char *buf) | |
1007 | { | |
1008 | return sprintf(buf, "%lu\n", reserved_size); | |
1009 | } | |
1010 | ||
1011 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1012 | struct kobj_attribute *attr, | |
1013 | const char *buf, size_t n) | |
1014 | { | |
1015 | unsigned long size; | |
1016 | ||
1017 | if (sscanf(buf, "%lu", &size) == 1) { | |
1018 | reserved_size = size; | |
1019 | return n; | |
1020 | } | |
1021 | ||
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
1025 | power_attr(reserved_size); | |
1026 | ||
1da177e4 LT |
1027 | static struct attribute * g[] = { |
1028 | &disk_attr.attr, | |
1029 | &resume_attr.attr, | |
ca0aec0f | 1030 | &image_size_attr.attr, |
ddeb6487 | 1031 | &reserved_size_attr.attr, |
1da177e4 LT |
1032 | NULL, |
1033 | }; | |
1034 | ||
1035 | ||
1036 | static struct attribute_group attr_group = { | |
1037 | .attrs = g, | |
1038 | }; | |
1039 | ||
1040 | ||
1041 | static int __init pm_disk_init(void) | |
1042 | { | |
d76e15fb | 1043 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | core_initcall(pm_disk_init); | |
1047 | ||
1048 | ||
1049 | static int __init resume_setup(char *str) | |
1050 | { | |
1051 | if (noresume) | |
1052 | return 1; | |
1053 | ||
1054 | strncpy( resume_file, str, 255 ); | |
1055 | return 1; | |
1056 | } | |
1057 | ||
9a154d9d RW |
1058 | static int __init resume_offset_setup(char *str) |
1059 | { | |
1060 | unsigned long long offset; | |
1061 | ||
1062 | if (noresume) | |
1063 | return 1; | |
1064 | ||
1065 | if (sscanf(str, "%llu", &offset) == 1) | |
1066 | swsusp_resume_block = offset; | |
1067 | ||
1068 | return 1; | |
1069 | } | |
1070 | ||
f996fc96 BS |
1071 | static int __init hibernate_setup(char *str) |
1072 | { | |
1073 | if (!strncmp(str, "noresume", 8)) | |
1074 | noresume = 1; | |
1075 | else if (!strncmp(str, "nocompress", 10)) | |
1076 | nocompress = 1; | |
1077 | return 1; | |
1078 | } | |
1079 | ||
1da177e4 LT |
1080 | static int __init noresume_setup(char *str) |
1081 | { | |
1082 | noresume = 1; | |
1083 | return 1; | |
1084 | } | |
1085 | ||
6f8d7022 BS |
1086 | static int __init resumewait_setup(char *str) |
1087 | { | |
1088 | resume_wait = 1; | |
1089 | return 1; | |
1090 | } | |
1091 | ||
f126f733 BS |
1092 | static int __init resumedelay_setup(char *str) |
1093 | { | |
1094 | resume_delay = simple_strtoul(str, NULL, 0); | |
1095 | return 1; | |
1096 | } | |
1097 | ||
1da177e4 | 1098 | __setup("noresume", noresume_setup); |
9a154d9d | 1099 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1100 | __setup("resume=", resume_setup); |
f996fc96 | 1101 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1102 | __setup("resumewait", resumewait_setup); |
f126f733 | 1103 | __setup("resumedelay=", resumedelay_setup); |