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Commit | Line | Data |
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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 | ||
6e5fdeed | 12 | #include <linux/export.h> |
1da177e4 LT |
13 | #include <linux/suspend.h> |
14 | #include <linux/syscalls.h> | |
15 | #include <linux/reboot.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/device.h> | |
6f8d7022 | 18 | #include <linux/async.h> |
1bfcf130 | 19 | #include <linux/kmod.h> |
1da177e4 LT |
20 | #include <linux/delay.h> |
21 | #include <linux/fs.h> | |
d53d9f16 | 22 | #include <linux/mount.h> |
88d10bba | 23 | #include <linux/pm.h> |
97c7801c | 24 | #include <linux/console.h> |
e3920fb4 | 25 | #include <linux/cpu.h> |
7dfb7103 | 26 | #include <linux/freezer.h> |
5a0e3ad6 | 27 | #include <linux/gfp.h> |
40dc166c | 28 | #include <linux/syscore_ops.h> |
c7510859 | 29 | #include <scsi/scsi_scan.h> |
d53d9f16 | 30 | |
1da177e4 LT |
31 | #include "power.h" |
32 | ||
33 | ||
d231ff1a BS |
34 | static int nocompress; |
35 | static int noresume; | |
36 | static int resume_wait; | |
37 | static int resume_delay; | |
47a460d5 | 38 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 39 | dev_t swsusp_resume_device; |
9a154d9d | 40 | sector_t swsusp_resume_block; |
d231ff1a | 41 | int in_suspend __nosavedata; |
1da177e4 | 42 | |
a3d25c27 RW |
43 | enum { |
44 | HIBERNATION_INVALID, | |
45 | HIBERNATION_PLATFORM, | |
46 | HIBERNATION_TEST, | |
47 | HIBERNATION_TESTPROC, | |
48 | HIBERNATION_SHUTDOWN, | |
49 | HIBERNATION_REBOOT, | |
50 | /* keep last */ | |
51 | __HIBERNATION_AFTER_LAST | |
52 | }; | |
53 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
54 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
55 | ||
56 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
57 | ||
073ef1f6 | 58 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
59 | |
60 | /** | |
f42a9813 RW |
61 | * hibernation_set_ops - Set the global hibernate operations. |
62 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 63 | */ |
073ef1f6 | 64 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 65 | { |
caea99ef RW |
66 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
67 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 68 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
69 | WARN_ON(1); |
70 | return; | |
71 | } | |
72 | mutex_lock(&pm_mutex); | |
73 | hibernation_ops = ops; | |
74 | if (ops) | |
75 | hibernation_mode = HIBERNATION_PLATFORM; | |
76 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
77 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
78 | ||
79 | mutex_unlock(&pm_mutex); | |
80 | } | |
81 | ||
abfe2d7b RW |
82 | static bool entering_platform_hibernation; |
83 | ||
84 | bool system_entering_hibernation(void) | |
85 | { | |
86 | return entering_platform_hibernation; | |
87 | } | |
88 | EXPORT_SYMBOL(system_entering_hibernation); | |
89 | ||
4cc79776 RW |
90 | #ifdef CONFIG_PM_DEBUG |
91 | static void hibernation_debug_sleep(void) | |
92 | { | |
93 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
94 | mdelay(5000); | |
95 | } | |
96 | ||
97 | static int hibernation_testmode(int mode) | |
98 | { | |
99 | if (hibernation_mode == mode) { | |
100 | hibernation_debug_sleep(); | |
101 | return 1; | |
102 | } | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int hibernation_test(int level) | |
107 | { | |
108 | if (pm_test_level == level) { | |
109 | hibernation_debug_sleep(); | |
110 | return 1; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | #else /* !CONFIG_PM_DEBUG */ | |
115 | static int hibernation_testmode(int mode) { return 0; } | |
116 | static int hibernation_test(int level) { return 0; } | |
117 | #endif /* !CONFIG_PM_DEBUG */ | |
118 | ||
74f270af | 119 | /** |
f42a9813 RW |
120 | * platform_begin - Call platform to start hibernation. |
121 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 122 | */ |
caea99ef | 123 | static int platform_begin(int platform_mode) |
74f270af RW |
124 | { |
125 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
126 | hibernation_ops->begin() : 0; |
127 | } | |
128 | ||
129 | /** | |
f42a9813 RW |
130 | * platform_end - Call platform to finish transition to the working state. |
131 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 132 | */ |
caea99ef RW |
133 | static void platform_end(int platform_mode) |
134 | { | |
135 | if (platform_mode && hibernation_ops) | |
136 | hibernation_ops->end(); | |
74f270af | 137 | } |
a3d25c27 | 138 | |
8a05aac2 | 139 | /** |
f42a9813 RW |
140 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
141 | * @platform_mode: Whether or not to use the platform driver. | |
142 | * | |
143 | * Use the platform driver to prepare the system for creating a hibernate image, | |
144 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
145 | */ |
146 | ||
74f270af | 147 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 148 | { |
7777fab9 | 149 | return (platform_mode && hibernation_ops) ? |
74f270af | 150 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 151 | } |
8a05aac2 | 152 | |
c7e0831d | 153 | /** |
f42a9813 RW |
154 | * platform_leave - Call platform to prepare a transition to the working state. |
155 | * @platform_mode: Whether or not to use the platform driver. | |
156 | * | |
157 | * Use the platform driver prepare to prepare the machine for switching to the | |
158 | * normal mode of operation. | |
159 | * | |
160 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 161 | */ |
c7e0831d RW |
162 | static void platform_leave(int platform_mode) |
163 | { | |
164 | if (platform_mode && hibernation_ops) | |
165 | hibernation_ops->leave(); | |
166 | } | |
167 | ||
a3d25c27 | 168 | /** |
f42a9813 RW |
169 | * platform_finish - Call platform to switch the system to the working state. |
170 | * @platform_mode: Whether or not to use the platform driver. | |
171 | * | |
172 | * Use the platform driver to switch the machine to the normal mode of | |
173 | * operation. | |
174 | * | |
175 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 176 | */ |
7777fab9 | 177 | static void platform_finish(int platform_mode) |
a3d25c27 | 178 | { |
7777fab9 | 179 | if (platform_mode && hibernation_ops) |
a3d25c27 | 180 | hibernation_ops->finish(); |
8a05aac2 SS |
181 | } |
182 | ||
a634cc10 | 183 | /** |
f42a9813 RW |
184 | * platform_pre_restore - Prepare for hibernate image restoration. |
185 | * @platform_mode: Whether or not to use the platform driver. | |
186 | * | |
187 | * Use the platform driver to prepare the system for resume from a hibernation | |
188 | * image. | |
189 | * | |
190 | * If the restore fails after this function has been called, | |
191 | * platform_restore_cleanup() must be called. | |
a634cc10 | 192 | */ |
a634cc10 RW |
193 | static int platform_pre_restore(int platform_mode) |
194 | { | |
195 | return (platform_mode && hibernation_ops) ? | |
196 | hibernation_ops->pre_restore() : 0; | |
197 | } | |
198 | ||
199 | /** | |
f42a9813 RW |
200 | * platform_restore_cleanup - Switch to the working state after failing restore. |
201 | * @platform_mode: Whether or not to use the platform driver. | |
202 | * | |
203 | * Use the platform driver to switch the system to the normal mode of operation | |
204 | * after a failing restore. | |
205 | * | |
206 | * If platform_pre_restore() has been called before the failing restore, this | |
207 | * function must be called too, regardless of the result of | |
208 | * platform_pre_restore(). | |
a634cc10 | 209 | */ |
a634cc10 RW |
210 | static void platform_restore_cleanup(int platform_mode) |
211 | { | |
212 | if (platform_mode && hibernation_ops) | |
213 | hibernation_ops->restore_cleanup(); | |
214 | } | |
215 | ||
d8f3de0d | 216 | /** |
f42a9813 RW |
217 | * platform_recover - Recover from a failure to suspend devices. |
218 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 219 | */ |
d8f3de0d RW |
220 | static void platform_recover(int platform_mode) |
221 | { | |
222 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
223 | hibernation_ops->recover(); | |
224 | } | |
225 | ||
8e60c6a1 | 226 | /** |
f42a9813 RW |
227 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
228 | * @start: Starting event. | |
229 | * @stop: Final event. | |
230 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
231 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 232 | */ |
8e60c6a1 NC |
233 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
234 | unsigned nr_pages, char *msg) | |
235 | { | |
236 | s64 elapsed_centisecs64; | |
237 | int centisecs; | |
238 | int k; | |
239 | int kps; | |
240 | ||
241 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
242 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
243 | centisecs = elapsed_centisecs64; | |
244 | if (centisecs == 0) | |
245 | centisecs = 1; /* avoid div-by-zero */ | |
246 | k = nr_pages * (PAGE_SIZE / 1024); | |
247 | kps = (k * 100) / centisecs; | |
248 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
249 | msg, k, | |
250 | centisecs / 100, centisecs % 100, | |
251 | kps / 1000, (kps % 1000) / 10); | |
252 | } | |
253 | ||
c7e0831d | 254 | /** |
f42a9813 RW |
255 | * create_image - Create a hibernation image. |
256 | * @platform_mode: Whether or not to use the platform driver. | |
257 | * | |
258 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image | |
259 | * and execute the drivers' .thaw_noirq() callbacks. | |
260 | * | |
261 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 262 | */ |
47a460d5 | 263 | static int create_image(int platform_mode) |
c7e0831d RW |
264 | { |
265 | int error; | |
266 | ||
d1616302 | 267 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 268 | if (error) { |
23976728 RW |
269 | printk(KERN_ERR "PM: Some devices failed to power down, " |
270 | "aborting hibernation\n"); | |
32bdfac5 | 271 | return error; |
c7e0831d | 272 | } |
2ed8d2b3 | 273 | |
4aecd671 RW |
274 | error = platform_pre_snapshot(platform_mode); |
275 | if (error || hibernation_test(TEST_PLATFORM)) | |
276 | goto Platform_finish; | |
277 | ||
278 | error = disable_nonboot_cpus(); | |
279 | if (error || hibernation_test(TEST_CPUS) | |
280 | || hibernation_testmode(HIBERNATION_TEST)) | |
281 | goto Enable_cpus; | |
282 | ||
2ed8d2b3 RW |
283 | local_irq_disable(); |
284 | ||
2e711c04 | 285 | error = syscore_suspend(); |
770824bd | 286 | if (error) { |
4484079d | 287 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 288 | "aborting hibernation\n"); |
4aecd671 | 289 | goto Enable_irqs; |
770824bd | 290 | } |
c7e0831d | 291 | |
a2867e08 | 292 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
293 | goto Power_up; |
294 | ||
295 | in_suspend = 1; | |
c7e0831d RW |
296 | save_processor_state(); |
297 | error = swsusp_arch_suspend(); | |
298 | if (error) | |
23976728 RW |
299 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
300 | error); | |
c7e0831d RW |
301 | /* Restore control flow magically appears here */ |
302 | restore_processor_state(); | |
c125e96f RW |
303 | if (!in_suspend) { |
304 | events_check_enabled = false; | |
c7e0831d | 305 | platform_leave(platform_mode); |
c125e96f | 306 | } |
4aecd671 | 307 | |
4cc79776 | 308 | Power_up: |
40dc166c | 309 | syscore_resume(); |
2ed8d2b3 | 310 | |
4aecd671 | 311 | Enable_irqs: |
2ed8d2b3 RW |
312 | local_irq_enable(); |
313 | ||
4aecd671 RW |
314 | Enable_cpus: |
315 | enable_nonboot_cpus(); | |
316 | ||
317 | Platform_finish: | |
318 | platform_finish(platform_mode); | |
319 | ||
d1616302 | 320 | dpm_resume_noirq(in_suspend ? |
1eede070 | 321 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 322 | |
c7e0831d RW |
323 | return error; |
324 | } | |
325 | ||
7777fab9 | 326 | /** |
f42a9813 RW |
327 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
328 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 329 | * |
f42a9813 | 330 | * This routine must be called with pm_mutex held. |
7777fab9 | 331 | */ |
7777fab9 RW |
332 | int hibernation_snapshot(int platform_mode) |
333 | { | |
91e7c75b | 334 | pm_message_t msg = PMSG_RECOVER; |
cbe2f5a6 | 335 | int error; |
7777fab9 | 336 | |
3fe0313e | 337 | error = platform_begin(platform_mode); |
7777fab9 | 338 | if (error) |
d074ee02 | 339 | goto Close; |
7777fab9 | 340 | |
64a473cb RW |
341 | /* Preallocate image memory before shutting down devices. */ |
342 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
343 | if (error) |
344 | goto Close; | |
345 | ||
346 | error = freeze_kernel_threads(); | |
347 | if (error) | |
348 | goto Close; | |
349 | ||
350 | error = dpm_prepare(PMSG_FREEZE); | |
74f270af | 351 | if (error) |
91e7c75b | 352 | goto Complete_devices; |
74f270af | 353 | |
7777fab9 | 354 | suspend_console(); |
c9e664f1 | 355 | pm_restrict_gfp_mask(); |
91e7c75b | 356 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 357 | if (error) |
d8f3de0d | 358 | goto Recover_platform; |
10a1803d | 359 | |
4cc79776 | 360 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 361 | goto Recover_platform; |
7777fab9 | 362 | |
4aecd671 | 363 | error = create_image(platform_mode); |
c9e664f1 RW |
364 | /* |
365 | * Control returns here (1) after the image has been created or the | |
366 | * image creation has failed and (2) after a successful restore. | |
367 | */ | |
4cc79776 | 368 | |
4cc79776 | 369 | Resume_devices: |
64a473cb RW |
370 | /* We may need to release the preallocated image pages here. */ |
371 | if (error || !in_suspend) | |
372 | swsusp_free(); | |
373 | ||
91e7c75b RW |
374 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
375 | dpm_resume(msg); | |
c9e664f1 RW |
376 | |
377 | if (error || !in_suspend) | |
378 | pm_restore_gfp_mask(); | |
379 | ||
7777fab9 | 380 | resume_console(); |
91e7c75b RW |
381 | |
382 | Complete_devices: | |
383 | dpm_complete(msg); | |
384 | ||
caea99ef RW |
385 | Close: |
386 | platform_end(platform_mode); | |
7777fab9 | 387 | return error; |
d8f3de0d RW |
388 | |
389 | Recover_platform: | |
390 | platform_recover(platform_mode); | |
391 | goto Resume_devices; | |
7777fab9 RW |
392 | } |
393 | ||
72df68ca | 394 | /** |
f42a9813 RW |
395 | * resume_target_kernel - Restore system state from a hibernation image. |
396 | * @platform_mode: Whether or not to use the platform driver. | |
397 | * | |
398 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of | |
399 | * highmem that have not been restored yet from the image and run the low-level | |
400 | * code that will restore the remaining contents of memory and switch to the | |
401 | * just restored target kernel. | |
72df68ca | 402 | */ |
4aecd671 | 403 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
404 | { |
405 | int error; | |
406 | ||
d1616302 | 407 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 408 | if (error) { |
23976728 | 409 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 410 | "aborting resume\n"); |
32bdfac5 | 411 | return error; |
72df68ca | 412 | } |
2ed8d2b3 | 413 | |
4aecd671 RW |
414 | error = platform_pre_restore(platform_mode); |
415 | if (error) | |
416 | goto Cleanup; | |
417 | ||
418 | error = disable_nonboot_cpus(); | |
419 | if (error) | |
420 | goto Enable_cpus; | |
421 | ||
2ed8d2b3 RW |
422 | local_irq_disable(); |
423 | ||
2e711c04 | 424 | error = syscore_suspend(); |
4aecd671 RW |
425 | if (error) |
426 | goto Enable_irqs; | |
427 | ||
72df68ca RW |
428 | save_processor_state(); |
429 | error = restore_highmem(); | |
430 | if (!error) { | |
431 | error = swsusp_arch_resume(); | |
432 | /* | |
433 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
434 | * Otherwise, execution continues at the place where |
435 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
436 | */ |
437 | BUG_ON(!error); | |
4e2d9491 RW |
438 | /* |
439 | * This call to restore_highmem() reverts the changes made by | |
440 | * the previous one. | |
441 | */ | |
72df68ca RW |
442 | restore_highmem(); |
443 | } | |
444 | /* | |
445 | * The only reason why swsusp_arch_resume() can fail is memory being | |
446 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 447 | * subsequent failures. |
72df68ca RW |
448 | */ |
449 | swsusp_free(); | |
450 | restore_processor_state(); | |
451 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 452 | |
40dc166c | 453 | syscore_resume(); |
2ed8d2b3 | 454 | |
4aecd671 | 455 | Enable_irqs: |
72df68ca | 456 | local_irq_enable(); |
2ed8d2b3 | 457 | |
4aecd671 RW |
458 | Enable_cpus: |
459 | enable_nonboot_cpus(); | |
460 | ||
461 | Cleanup: | |
462 | platform_restore_cleanup(platform_mode); | |
463 | ||
d1616302 | 464 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 465 | |
72df68ca RW |
466 | return error; |
467 | } | |
468 | ||
7777fab9 | 469 | /** |
f42a9813 RW |
470 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
471 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 472 | * |
f42a9813 | 473 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 474 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 475 | */ |
a634cc10 | 476 | int hibernation_restore(int platform_mode) |
7777fab9 | 477 | { |
cbe2f5a6 | 478 | int error; |
7777fab9 RW |
479 | |
480 | pm_prepare_console(); | |
481 | suspend_console(); | |
c9e664f1 | 482 | pm_restrict_gfp_mask(); |
d1616302 | 483 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 484 | if (!error) { |
4aecd671 | 485 | error = resume_target_kernel(platform_mode); |
d1616302 | 486 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 487 | } |
c9e664f1 | 488 | pm_restore_gfp_mask(); |
7777fab9 RW |
489 | resume_console(); |
490 | pm_restore_console(); | |
491 | return error; | |
492 | } | |
493 | ||
494 | /** | |
f42a9813 | 495 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 496 | */ |
7777fab9 RW |
497 | int hibernation_platform_enter(void) |
498 | { | |
cbe2f5a6 | 499 | int error; |
b1457bcc | 500 | |
9cd9a005 RW |
501 | if (!hibernation_ops) |
502 | return -ENOSYS; | |
503 | ||
504 | /* | |
505 | * We have cancelled the power transition by running | |
506 | * hibernation_ops->finish() before saving the image, so we should let | |
507 | * the firmware know that we're going to enter the sleep state after all | |
508 | */ | |
caea99ef | 509 | error = hibernation_ops->begin(); |
9cd9a005 | 510 | if (error) |
caea99ef | 511 | goto Close; |
9cd9a005 | 512 | |
abfe2d7b | 513 | entering_platform_hibernation = true; |
9cd9a005 | 514 | suspend_console(); |
d1616302 | 515 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
516 | if (error) { |
517 | if (hibernation_ops->recover) | |
518 | hibernation_ops->recover(); | |
519 | goto Resume_devices; | |
520 | } | |
9cd9a005 | 521 | |
d1616302 | 522 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 523 | if (error) |
32bdfac5 | 524 | goto Resume_devices; |
4aecd671 | 525 | |
9cd9a005 RW |
526 | error = hibernation_ops->prepare(); |
527 | if (error) | |
e681c9dd | 528 | goto Platform_finish; |
9cd9a005 RW |
529 | |
530 | error = disable_nonboot_cpus(); | |
531 | if (error) | |
e681c9dd | 532 | goto Platform_finish; |
2ed8d2b3 | 533 | |
4aecd671 | 534 | local_irq_disable(); |
40dc166c | 535 | syscore_suspend(); |
a2867e08 | 536 | if (pm_wakeup_pending()) { |
c125e96f RW |
537 | error = -EAGAIN; |
538 | goto Power_up; | |
539 | } | |
540 | ||
4aecd671 RW |
541 | hibernation_ops->enter(); |
542 | /* We should never get here */ | |
543 | while (1); | |
9cd9a005 | 544 | |
c125e96f | 545 | Power_up: |
40dc166c | 546 | syscore_resume(); |
c125e96f RW |
547 | local_irq_enable(); |
548 | enable_nonboot_cpus(); | |
549 | ||
e681c9dd | 550 | Platform_finish: |
9cd9a005 | 551 | hibernation_ops->finish(); |
2ed8d2b3 | 552 | |
f6f71f18 | 553 | dpm_resume_noirq(PMSG_RESTORE); |
4aecd671 | 554 | |
9cd9a005 | 555 | Resume_devices: |
abfe2d7b | 556 | entering_platform_hibernation = false; |
d1616302 | 557 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 558 | resume_console(); |
2ed8d2b3 | 559 | |
caea99ef RW |
560 | Close: |
561 | hibernation_ops->end(); | |
2ed8d2b3 | 562 | |
b1457bcc | 563 | return error; |
7777fab9 RW |
564 | } |
565 | ||
1da177e4 | 566 | /** |
f42a9813 | 567 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 568 | * |
f42a9813 RW |
569 | * Use the platform driver, if configured, to put the system into the sleep |
570 | * state corresponding to hibernation, or try to power it off or reboot, | |
571 | * depending on the value of hibernation_mode. | |
1da177e4 | 572 | */ |
fe0c935a | 573 | static void power_down(void) |
1da177e4 | 574 | { |
a3d25c27 RW |
575 | switch (hibernation_mode) { |
576 | case HIBERNATION_TEST: | |
577 | case HIBERNATION_TESTPROC: | |
fe0c935a | 578 | break; |
a3d25c27 | 579 | case HIBERNATION_REBOOT: |
fdde86ac | 580 | kernel_restart(NULL); |
1da177e4 | 581 | break; |
a3d25c27 | 582 | case HIBERNATION_PLATFORM: |
7777fab9 | 583 | hibernation_platform_enter(); |
9cd9a005 RW |
584 | case HIBERNATION_SHUTDOWN: |
585 | kernel_power_off(); | |
586 | break; | |
1da177e4 | 587 | } |
fdde86ac | 588 | kernel_halt(); |
fe0c935a JB |
589 | /* |
590 | * Valid image is on the disk, if we continue we risk serious data | |
591 | * corruption after resume. | |
592 | */ | |
23976728 | 593 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
594 | while(1); |
595 | } | |
596 | ||
1da177e4 LT |
597 | static int prepare_processes(void) |
598 | { | |
b918f6e6 | 599 | int error = 0; |
1da177e4 | 600 | |
1da177e4 LT |
601 | if (freeze_processes()) { |
602 | error = -EBUSY; | |
5a0a2f30 | 603 | thaw_processes(); |
1da177e4 | 604 | } |
5a72e04d | 605 | return error; |
1da177e4 LT |
606 | } |
607 | ||
1da177e4 | 608 | /** |
f42a9813 | 609 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 610 | */ |
a3d25c27 | 611 | int hibernate(void) |
1da177e4 LT |
612 | { |
613 | int error; | |
614 | ||
b10d9117 | 615 | mutex_lock(&pm_mutex); |
0709db60 | 616 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
617 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
618 | error = -EBUSY; | |
619 | goto Unlock; | |
620 | } | |
621 | ||
5a0a2f30 | 622 | pm_prepare_console(); |
b10d9117 RW |
623 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
624 | if (error) | |
625 | goto Exit; | |
0709db60 | 626 | |
1bfcf130 RW |
627 | error = usermodehelper_disable(); |
628 | if (error) | |
629 | goto Exit; | |
630 | ||
0709db60 RW |
631 | /* Allocate memory management structures */ |
632 | error = create_basic_memory_bitmaps(); | |
633 | if (error) | |
634 | goto Exit; | |
635 | ||
23976728 | 636 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
637 | sys_sync(); |
638 | printk("done.\n"); | |
639 | ||
1da177e4 | 640 | error = prepare_processes(); |
5a72e04d | 641 | if (error) |
0709db60 | 642 | goto Finish; |
1da177e4 | 643 | |
4cc79776 | 644 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 645 | goto Thaw; |
4cc79776 RW |
646 | |
647 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
648 | goto Thaw; | |
649 | ||
7777fab9 | 650 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
64a473cb RW |
651 | if (error) |
652 | goto Thaw; | |
653 | ||
654 | if (in_suspend) { | |
a634cc10 RW |
655 | unsigned int flags = 0; |
656 | ||
657 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
658 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
659 | if (nocompress) |
660 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
661 | else |
662 | flags |= SF_CRC32_MODE; | |
663 | ||
1da177e4 | 664 | pr_debug("PM: writing image.\n"); |
a634cc10 | 665 | error = swsusp_write(flags); |
7777fab9 | 666 | swsusp_free(); |
1da177e4 | 667 | if (!error) |
fe0c935a | 668 | power_down(); |
5262a475 | 669 | in_suspend = 0; |
c9e664f1 | 670 | pm_restore_gfp_mask(); |
b918f6e6 | 671 | } else { |
1da177e4 | 672 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 673 | } |
64a473cb | 674 | |
b918f6e6 | 675 | Thaw: |
5a0a2f30 | 676 | thaw_processes(); |
0709db60 RW |
677 | Finish: |
678 | free_basic_memory_bitmaps(); | |
1bfcf130 | 679 | usermodehelper_enable(); |
0709db60 | 680 | Exit: |
b10d9117 | 681 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 682 | pm_restore_console(); |
0709db60 | 683 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
684 | Unlock: |
685 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
686 | return error; |
687 | } | |
688 | ||
689 | ||
690 | /** | |
f42a9813 RW |
691 | * software_resume - Resume from a saved hibernation image. |
692 | * | |
693 | * This routine is called as a late initcall, when all devices have been | |
694 | * discovered and initialized already. | |
1da177e4 | 695 | * |
f42a9813 RW |
696 | * The image reading code is called to see if there is a hibernation image |
697 | * available for reading. If that is the case, devices are quiesced and the | |
698 | * contents of memory is restored from the saved image. | |
1da177e4 | 699 | * |
f42a9813 RW |
700 | * If this is successful, control reappears in the restored target kernel in |
701 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
702 | * attempts to recover gracefully and make the kernel return to the normal mode | |
703 | * of operation. | |
1da177e4 | 704 | */ |
1da177e4 LT |
705 | static int software_resume(void) |
706 | { | |
707 | int error; | |
a634cc10 | 708 | unsigned int flags; |
1da177e4 | 709 | |
eed3ee08 AV |
710 | /* |
711 | * If the user said "noresume".. bail out early. | |
712 | */ | |
713 | if (noresume) | |
714 | return 0; | |
715 | ||
60a0d233 JB |
716 | /* |
717 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
718 | * is configured into the kernel. Since the regular hibernate | |
719 | * trigger path is via sysfs which takes a buffer mutex before | |
720 | * calling hibernate functions (which take pm_mutex) this can | |
721 | * cause lockdep to complain about a possible ABBA deadlock | |
722 | * which cannot happen since we're in the boot code here and | |
723 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
724 | * here to avoid lockdep complaining. | |
725 | */ | |
726 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
727 | |
728 | if (swsusp_resume_device) | |
729 | goto Check_image; | |
730 | ||
731 | if (!strlen(resume_file)) { | |
732 | error = -ENOENT; | |
733 | goto Unlock; | |
734 | } | |
735 | ||
d0941ead | 736 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 737 | |
f126f733 BS |
738 | if (resume_delay) { |
739 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
740 | resume_delay); | |
741 | ssleep(resume_delay); | |
742 | } | |
743 | ||
0c8454f5 RW |
744 | /* Check if the device is there */ |
745 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 746 | if (!swsusp_resume_device) { |
eed3ee08 AV |
747 | /* |
748 | * Some device discovery might still be in progress; we need | |
749 | * to wait for this to finish. | |
750 | */ | |
751 | wait_for_device_probe(); | |
6f8d7022 BS |
752 | |
753 | if (resume_wait) { | |
754 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
755 | msleep(10); | |
756 | async_synchronize_full(); | |
757 | } | |
758 | ||
0c8454f5 RW |
759 | /* |
760 | * We can't depend on SCSI devices being available after loading | |
761 | * one of their modules until scsi_complete_async_scans() is | |
762 | * called and the resume device usually is a SCSI one. | |
763 | */ | |
764 | scsi_complete_async_scans(); | |
765 | ||
3efa147a | 766 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
767 | if (!swsusp_resume_device) { |
768 | error = -ENODEV; | |
769 | goto Unlock; | |
770 | } | |
3efa147a PM |
771 | } |
772 | ||
0c8454f5 | 773 | Check_image: |
d0941ead | 774 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 775 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 776 | |
d0941ead | 777 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
778 | error = swsusp_check(); |
779 | if (error) | |
74dfd666 | 780 | goto Unlock; |
1da177e4 | 781 | |
0709db60 RW |
782 | /* The snapshot device should not be opened while we're running */ |
783 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
784 | error = -EBUSY; | |
76b57e61 | 785 | swsusp_close(FMODE_READ); |
0709db60 RW |
786 | goto Unlock; |
787 | } | |
788 | ||
5a0a2f30 | 789 | pm_prepare_console(); |
c3e94d89 AS |
790 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
791 | if (error) | |
76b57e61 | 792 | goto close_finish; |
c3e94d89 | 793 | |
1bfcf130 RW |
794 | error = usermodehelper_disable(); |
795 | if (error) | |
76b57e61 | 796 | goto close_finish; |
1bfcf130 | 797 | |
74dfd666 RW |
798 | error = create_basic_memory_bitmaps(); |
799 | if (error) | |
76b57e61 | 800 | goto close_finish; |
1da177e4 | 801 | |
74dfd666 | 802 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
803 | error = prepare_processes(); |
804 | if (error) { | |
c2dd0dae | 805 | swsusp_close(FMODE_READ); |
5a72e04d | 806 | goto Done; |
1da177e4 LT |
807 | } |
808 | ||
d0941ead | 809 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 810 | |
a634cc10 | 811 | error = swsusp_read(&flags); |
76b57e61 | 812 | swsusp_close(FMODE_READ); |
ed746e3b | 813 | if (!error) |
a634cc10 | 814 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 815 | |
d0941ead | 816 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 817 | swsusp_free(); |
5a0a2f30 | 818 | thaw_processes(); |
1da177e4 | 819 | Done: |
74dfd666 | 820 | free_basic_memory_bitmaps(); |
1bfcf130 | 821 | usermodehelper_enable(); |
0709db60 | 822 | Finish: |
c3e94d89 | 823 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 824 | pm_restore_console(); |
0709db60 | 825 | atomic_inc(&snapshot_device_available); |
dd5d666b | 826 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 827 | Unlock: |
a6d70980 | 828 | mutex_unlock(&pm_mutex); |
d0941ead | 829 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 830 | return error; |
76b57e61 JS |
831 | close_finish: |
832 | swsusp_close(FMODE_READ); | |
833 | goto Finish; | |
1da177e4 LT |
834 | } |
835 | ||
836 | late_initcall(software_resume); | |
837 | ||
838 | ||
a3d25c27 RW |
839 | static const char * const hibernation_modes[] = { |
840 | [HIBERNATION_PLATFORM] = "platform", | |
841 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
842 | [HIBERNATION_REBOOT] = "reboot", | |
843 | [HIBERNATION_TEST] = "test", | |
844 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
845 | }; |
846 | ||
f42a9813 RW |
847 | /* |
848 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 849 | * |
f42a9813 RW |
850 | * Hibernation can be handled in several ways. There are a few different ways |
851 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
852 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
853 | * mostly), or using one of the two available test modes. | |
1da177e4 | 854 | * |
f42a9813 RW |
855 | * The sysfs file /sys/power/disk provides an interface for selecting the |
856 | * hibernation mode to use. Reading from this file causes the available modes | |
857 | * to be printed. There are 5 modes that can be supported: | |
1da177e4 | 858 | * |
1da177e4 LT |
859 | * 'platform' |
860 | * 'shutdown' | |
861 | * 'reboot' | |
11d77d0c JB |
862 | * 'test' |
863 | * 'testproc' | |
1da177e4 | 864 | * |
f42a9813 RW |
865 | * If a platform hibernation driver is in use, 'platform' will be supported |
866 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
867 | * The selected option (i.e. the one corresponding to the current value of | |
868 | * hibernation_mode) is enclosed by a square bracket. | |
869 | * | |
870 | * To select a given hibernation mode it is necessary to write the mode's | |
871 | * string representation (as returned by reading from /sys/power/disk) back | |
872 | * into /sys/power/disk. | |
1da177e4 LT |
873 | */ |
874 | ||
386f275f KS |
875 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
876 | char *buf) | |
1da177e4 | 877 | { |
f0ced9b2 JB |
878 | int i; |
879 | char *start = buf; | |
880 | ||
a3d25c27 RW |
881 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
882 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
883 | continue; |
884 | switch (i) { | |
a3d25c27 RW |
885 | case HIBERNATION_SHUTDOWN: |
886 | case HIBERNATION_REBOOT: | |
887 | case HIBERNATION_TEST: | |
888 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 889 | break; |
a3d25c27 RW |
890 | case HIBERNATION_PLATFORM: |
891 | if (hibernation_ops) | |
f0ced9b2 JB |
892 | break; |
893 | /* not a valid mode, continue with loop */ | |
894 | continue; | |
895 | } | |
a3d25c27 RW |
896 | if (i == hibernation_mode) |
897 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 898 | else |
a3d25c27 | 899 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
900 | } |
901 | buf += sprintf(buf, "\n"); | |
902 | return buf-start; | |
1da177e4 LT |
903 | } |
904 | ||
386f275f KS |
905 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
906 | const char *buf, size_t n) | |
1da177e4 LT |
907 | { |
908 | int error = 0; | |
909 | int i; | |
910 | int len; | |
911 | char *p; | |
a3d25c27 | 912 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
913 | |
914 | p = memchr(buf, '\n', n); | |
915 | len = p ? p - buf : n; | |
916 | ||
a6d70980 | 917 | mutex_lock(&pm_mutex); |
a3d25c27 | 918 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
919 | if (len == strlen(hibernation_modes[i]) |
920 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
921 | mode = i; |
922 | break; | |
923 | } | |
924 | } | |
a3d25c27 | 925 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 926 | switch (mode) { |
a3d25c27 RW |
927 | case HIBERNATION_SHUTDOWN: |
928 | case HIBERNATION_REBOOT: | |
929 | case HIBERNATION_TEST: | |
930 | case HIBERNATION_TESTPROC: | |
931 | hibernation_mode = mode; | |
fe0c935a | 932 | break; |
a3d25c27 RW |
933 | case HIBERNATION_PLATFORM: |
934 | if (hibernation_ops) | |
935 | hibernation_mode = mode; | |
1da177e4 LT |
936 | else |
937 | error = -EINVAL; | |
938 | } | |
a3d25c27 | 939 | } else |
1da177e4 LT |
940 | error = -EINVAL; |
941 | ||
a3d25c27 | 942 | if (!error) |
23976728 | 943 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 944 | hibernation_modes[mode]); |
a6d70980 | 945 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
946 | return error ? error : n; |
947 | } | |
948 | ||
949 | power_attr(disk); | |
950 | ||
386f275f KS |
951 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
952 | char *buf) | |
1da177e4 LT |
953 | { |
954 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
955 | MINOR(swsusp_resume_device)); | |
956 | } | |
957 | ||
386f275f KS |
958 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
959 | const char *buf, size_t n) | |
1da177e4 | 960 | { |
1da177e4 | 961 | unsigned int maj, min; |
1da177e4 | 962 | dev_t res; |
a576219a | 963 | int ret = -EINVAL; |
1da177e4 | 964 | |
a576219a AM |
965 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
966 | goto out; | |
1da177e4 | 967 | |
a576219a AM |
968 | res = MKDEV(maj,min); |
969 | if (maj != MAJOR(res) || min != MINOR(res)) | |
970 | goto out; | |
1da177e4 | 971 | |
a6d70980 | 972 | mutex_lock(&pm_mutex); |
a576219a | 973 | swsusp_resume_device = res; |
a6d70980 | 974 | mutex_unlock(&pm_mutex); |
23976728 | 975 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
976 | noresume = 0; |
977 | software_resume(); | |
978 | ret = n; | |
59a49335 | 979 | out: |
a576219a | 980 | return ret; |
1da177e4 LT |
981 | } |
982 | ||
983 | power_attr(resume); | |
984 | ||
386f275f KS |
985 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
986 | char *buf) | |
ca0aec0f | 987 | { |
853609b6 | 988 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
989 | } |
990 | ||
386f275f KS |
991 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
992 | const char *buf, size_t n) | |
ca0aec0f | 993 | { |
853609b6 | 994 | unsigned long size; |
ca0aec0f | 995 | |
853609b6 | 996 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
997 | image_size = size; |
998 | return n; | |
999 | } | |
1000 | ||
1001 | return -EINVAL; | |
1002 | } | |
1003 | ||
1004 | power_attr(image_size); | |
1005 | ||
ddeb6487 RW |
1006 | static ssize_t reserved_size_show(struct kobject *kobj, |
1007 | struct kobj_attribute *attr, char *buf) | |
1008 | { | |
1009 | return sprintf(buf, "%lu\n", reserved_size); | |
1010 | } | |
1011 | ||
1012 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1013 | struct kobj_attribute *attr, | |
1014 | const char *buf, size_t n) | |
1015 | { | |
1016 | unsigned long size; | |
1017 | ||
1018 | if (sscanf(buf, "%lu", &size) == 1) { | |
1019 | reserved_size = size; | |
1020 | return n; | |
1021 | } | |
1022 | ||
1023 | return -EINVAL; | |
1024 | } | |
1025 | ||
1026 | power_attr(reserved_size); | |
1027 | ||
1da177e4 LT |
1028 | static struct attribute * g[] = { |
1029 | &disk_attr.attr, | |
1030 | &resume_attr.attr, | |
ca0aec0f | 1031 | &image_size_attr.attr, |
ddeb6487 | 1032 | &reserved_size_attr.attr, |
1da177e4 LT |
1033 | NULL, |
1034 | }; | |
1035 | ||
1036 | ||
1037 | static struct attribute_group attr_group = { | |
1038 | .attrs = g, | |
1039 | }; | |
1040 | ||
1041 | ||
1042 | static int __init pm_disk_init(void) | |
1043 | { | |
d76e15fb | 1044 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | core_initcall(pm_disk_init); | |
1048 | ||
1049 | ||
1050 | static int __init resume_setup(char *str) | |
1051 | { | |
1052 | if (noresume) | |
1053 | return 1; | |
1054 | ||
1055 | strncpy( resume_file, str, 255 ); | |
1056 | return 1; | |
1057 | } | |
1058 | ||
9a154d9d RW |
1059 | static int __init resume_offset_setup(char *str) |
1060 | { | |
1061 | unsigned long long offset; | |
1062 | ||
1063 | if (noresume) | |
1064 | return 1; | |
1065 | ||
1066 | if (sscanf(str, "%llu", &offset) == 1) | |
1067 | swsusp_resume_block = offset; | |
1068 | ||
1069 | return 1; | |
1070 | } | |
1071 | ||
f996fc96 BS |
1072 | static int __init hibernate_setup(char *str) |
1073 | { | |
1074 | if (!strncmp(str, "noresume", 8)) | |
1075 | noresume = 1; | |
1076 | else if (!strncmp(str, "nocompress", 10)) | |
1077 | nocompress = 1; | |
1078 | return 1; | |
1079 | } | |
1080 | ||
1da177e4 LT |
1081 | static int __init noresume_setup(char *str) |
1082 | { | |
1083 | noresume = 1; | |
1084 | return 1; | |
1085 | } | |
1086 | ||
6f8d7022 BS |
1087 | static int __init resumewait_setup(char *str) |
1088 | { | |
1089 | resume_wait = 1; | |
1090 | return 1; | |
1091 | } | |
1092 | ||
f126f733 BS |
1093 | static int __init resumedelay_setup(char *str) |
1094 | { | |
1095 | resume_delay = simple_strtoul(str, NULL, 0); | |
1096 | return 1; | |
1097 | } | |
1098 | ||
1da177e4 | 1099 | __setup("noresume", noresume_setup); |
9a154d9d | 1100 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1101 | __setup("resume=", resume_setup); |
f996fc96 | 1102 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1103 | __setup("resumewait", resumewait_setup); |
f126f733 | 1104 | __setup("resumedelay=", resumedelay_setup); |