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 | ||
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 | ||
aa9a7b11 SB |
58 | static bool freezer_test_done; |
59 | ||
073ef1f6 | 60 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
61 | |
62 | /** | |
f42a9813 RW |
63 | * hibernation_set_ops - Set the global hibernate operations. |
64 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 65 | */ |
073ef1f6 | 66 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 67 | { |
caea99ef RW |
68 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
69 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 70 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
71 | WARN_ON(1); |
72 | return; | |
73 | } | |
74 | mutex_lock(&pm_mutex); | |
75 | hibernation_ops = ops; | |
76 | if (ops) | |
77 | hibernation_mode = HIBERNATION_PLATFORM; | |
78 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
79 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
80 | ||
81 | mutex_unlock(&pm_mutex); | |
82 | } | |
83 | ||
abfe2d7b RW |
84 | static bool entering_platform_hibernation; |
85 | ||
86 | bool system_entering_hibernation(void) | |
87 | { | |
88 | return entering_platform_hibernation; | |
89 | } | |
90 | EXPORT_SYMBOL(system_entering_hibernation); | |
91 | ||
4cc79776 RW |
92 | #ifdef CONFIG_PM_DEBUG |
93 | static void hibernation_debug_sleep(void) | |
94 | { | |
95 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
96 | mdelay(5000); | |
97 | } | |
98 | ||
99 | static int hibernation_testmode(int mode) | |
100 | { | |
101 | if (hibernation_mode == mode) { | |
102 | hibernation_debug_sleep(); | |
103 | return 1; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static int hibernation_test(int level) | |
109 | { | |
110 | if (pm_test_level == level) { | |
111 | hibernation_debug_sleep(); | |
112 | return 1; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | #else /* !CONFIG_PM_DEBUG */ | |
117 | static int hibernation_testmode(int mode) { return 0; } | |
118 | static int hibernation_test(int level) { return 0; } | |
119 | #endif /* !CONFIG_PM_DEBUG */ | |
120 | ||
74f270af | 121 | /** |
f42a9813 RW |
122 | * platform_begin - Call platform to start hibernation. |
123 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 124 | */ |
caea99ef | 125 | static int platform_begin(int platform_mode) |
74f270af RW |
126 | { |
127 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
128 | hibernation_ops->begin() : 0; |
129 | } | |
130 | ||
131 | /** | |
f42a9813 RW |
132 | * platform_end - Call platform to finish transition to the working state. |
133 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 134 | */ |
caea99ef RW |
135 | static void platform_end(int platform_mode) |
136 | { | |
137 | if (platform_mode && hibernation_ops) | |
138 | hibernation_ops->end(); | |
74f270af | 139 | } |
a3d25c27 | 140 | |
8a05aac2 | 141 | /** |
f42a9813 RW |
142 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
143 | * @platform_mode: Whether or not to use the platform driver. | |
144 | * | |
145 | * Use the platform driver to prepare the system for creating a hibernate image, | |
146 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
147 | */ |
148 | ||
74f270af | 149 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 150 | { |
7777fab9 | 151 | return (platform_mode && hibernation_ops) ? |
74f270af | 152 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 153 | } |
8a05aac2 | 154 | |
c7e0831d | 155 | /** |
f42a9813 RW |
156 | * platform_leave - Call platform to prepare a transition to the working state. |
157 | * @platform_mode: Whether or not to use the platform driver. | |
158 | * | |
159 | * Use the platform driver prepare to prepare the machine for switching to the | |
160 | * normal mode of operation. | |
161 | * | |
162 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 163 | */ |
c7e0831d RW |
164 | static void platform_leave(int platform_mode) |
165 | { | |
166 | if (platform_mode && hibernation_ops) | |
167 | hibernation_ops->leave(); | |
168 | } | |
169 | ||
a3d25c27 | 170 | /** |
f42a9813 RW |
171 | * platform_finish - Call platform to switch the system to the working state. |
172 | * @platform_mode: Whether or not to use the platform driver. | |
173 | * | |
174 | * Use the platform driver to switch the machine to the normal mode of | |
175 | * operation. | |
176 | * | |
177 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 178 | */ |
7777fab9 | 179 | static void platform_finish(int platform_mode) |
a3d25c27 | 180 | { |
7777fab9 | 181 | if (platform_mode && hibernation_ops) |
a3d25c27 | 182 | hibernation_ops->finish(); |
8a05aac2 SS |
183 | } |
184 | ||
a634cc10 | 185 | /** |
f42a9813 RW |
186 | * platform_pre_restore - Prepare for hibernate image restoration. |
187 | * @platform_mode: Whether or not to use the platform driver. | |
188 | * | |
189 | * Use the platform driver to prepare the system for resume from a hibernation | |
190 | * image. | |
191 | * | |
192 | * If the restore fails after this function has been called, | |
193 | * platform_restore_cleanup() must be called. | |
a634cc10 | 194 | */ |
a634cc10 RW |
195 | static int platform_pre_restore(int platform_mode) |
196 | { | |
197 | return (platform_mode && hibernation_ops) ? | |
198 | hibernation_ops->pre_restore() : 0; | |
199 | } | |
200 | ||
201 | /** | |
f42a9813 RW |
202 | * platform_restore_cleanup - Switch to the working state after failing restore. |
203 | * @platform_mode: Whether or not to use the platform driver. | |
204 | * | |
205 | * Use the platform driver to switch the system to the normal mode of operation | |
206 | * after a failing restore. | |
207 | * | |
208 | * If platform_pre_restore() has been called before the failing restore, this | |
209 | * function must be called too, regardless of the result of | |
210 | * platform_pre_restore(). | |
a634cc10 | 211 | */ |
a634cc10 RW |
212 | static void platform_restore_cleanup(int platform_mode) |
213 | { | |
214 | if (platform_mode && hibernation_ops) | |
215 | hibernation_ops->restore_cleanup(); | |
216 | } | |
217 | ||
d8f3de0d | 218 | /** |
f42a9813 RW |
219 | * platform_recover - Recover from a failure to suspend devices. |
220 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 221 | */ |
d8f3de0d RW |
222 | static void platform_recover(int platform_mode) |
223 | { | |
224 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
225 | hibernation_ops->recover(); | |
226 | } | |
227 | ||
8e60c6a1 | 228 | /** |
f42a9813 RW |
229 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
230 | * @start: Starting event. | |
231 | * @stop: Final event. | |
232 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
233 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 234 | */ |
8e60c6a1 NC |
235 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
236 | unsigned nr_pages, char *msg) | |
237 | { | |
238 | s64 elapsed_centisecs64; | |
239 | int centisecs; | |
240 | int k; | |
241 | int kps; | |
242 | ||
243 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
244 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
245 | centisecs = elapsed_centisecs64; | |
246 | if (centisecs == 0) | |
247 | centisecs = 1; /* avoid div-by-zero */ | |
248 | k = nr_pages * (PAGE_SIZE / 1024); | |
249 | kps = (k * 100) / centisecs; | |
250 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
251 | msg, k, | |
252 | centisecs / 100, centisecs % 100, | |
253 | kps / 1000, (kps % 1000) / 10); | |
254 | } | |
255 | ||
c7e0831d | 256 | /** |
f42a9813 RW |
257 | * create_image - Create a hibernation image. |
258 | * @platform_mode: Whether or not to use the platform driver. | |
259 | * | |
260 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image | |
261 | * and execute the drivers' .thaw_noirq() callbacks. | |
262 | * | |
263 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 264 | */ |
47a460d5 | 265 | static int create_image(int platform_mode) |
c7e0831d RW |
266 | { |
267 | int error; | |
268 | ||
d1616302 | 269 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 270 | if (error) { |
23976728 RW |
271 | printk(KERN_ERR "PM: Some devices failed to power down, " |
272 | "aborting hibernation\n"); | |
32bdfac5 | 273 | return error; |
c7e0831d | 274 | } |
2ed8d2b3 | 275 | |
4aecd671 RW |
276 | error = platform_pre_snapshot(platform_mode); |
277 | if (error || hibernation_test(TEST_PLATFORM)) | |
278 | goto Platform_finish; | |
279 | ||
280 | error = disable_nonboot_cpus(); | |
281 | if (error || hibernation_test(TEST_CPUS) | |
282 | || hibernation_testmode(HIBERNATION_TEST)) | |
283 | goto Enable_cpus; | |
284 | ||
2ed8d2b3 RW |
285 | local_irq_disable(); |
286 | ||
2e711c04 | 287 | error = syscore_suspend(); |
770824bd | 288 | if (error) { |
4484079d | 289 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 290 | "aborting hibernation\n"); |
4aecd671 | 291 | goto Enable_irqs; |
770824bd | 292 | } |
c7e0831d | 293 | |
a2867e08 | 294 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
295 | goto Power_up; |
296 | ||
297 | in_suspend = 1; | |
c7e0831d RW |
298 | save_processor_state(); |
299 | error = swsusp_arch_suspend(); | |
300 | if (error) | |
23976728 RW |
301 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
302 | error); | |
c7e0831d RW |
303 | /* Restore control flow magically appears here */ |
304 | restore_processor_state(); | |
c125e96f RW |
305 | if (!in_suspend) { |
306 | events_check_enabled = false; | |
c7e0831d | 307 | platform_leave(platform_mode); |
c125e96f | 308 | } |
4aecd671 | 309 | |
4cc79776 | 310 | Power_up: |
40dc166c | 311 | syscore_resume(); |
2ed8d2b3 | 312 | |
4aecd671 | 313 | Enable_irqs: |
2ed8d2b3 RW |
314 | local_irq_enable(); |
315 | ||
4aecd671 RW |
316 | Enable_cpus: |
317 | enable_nonboot_cpus(); | |
318 | ||
319 | Platform_finish: | |
320 | platform_finish(platform_mode); | |
321 | ||
d1616302 | 322 | dpm_resume_noirq(in_suspend ? |
1eede070 | 323 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 324 | |
c7e0831d RW |
325 | return error; |
326 | } | |
327 | ||
7777fab9 | 328 | /** |
f42a9813 RW |
329 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
330 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 331 | * |
f42a9813 | 332 | * This routine must be called with pm_mutex held. |
7777fab9 | 333 | */ |
7777fab9 RW |
334 | int hibernation_snapshot(int platform_mode) |
335 | { | |
91e7c75b | 336 | pm_message_t msg = PMSG_RECOVER; |
cbe2f5a6 | 337 | int error; |
7777fab9 | 338 | |
3fe0313e | 339 | error = platform_begin(platform_mode); |
7777fab9 | 340 | if (error) |
d074ee02 | 341 | goto Close; |
7777fab9 | 342 | |
64a473cb RW |
343 | /* Preallocate image memory before shutting down devices. */ |
344 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
345 | if (error) |
346 | goto Close; | |
347 | ||
348 | error = freeze_kernel_threads(); | |
349 | if (error) | |
bb58dd5d | 350 | goto Cleanup; |
2aede851 | 351 | |
aa9a7b11 SB |
352 | if (hibernation_test(TEST_FREEZER) || |
353 | hibernation_testmode(HIBERNATION_TESTPROC)) { | |
354 | ||
355 | /* | |
356 | * Indicate to the caller that we are returning due to a | |
357 | * successful freezer test. | |
358 | */ | |
359 | freezer_test_done = true; | |
bb58dd5d | 360 | goto Cleanup; |
aa9a7b11 SB |
361 | } |
362 | ||
2aede851 | 363 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d RW |
364 | if (error) { |
365 | dpm_complete(msg); | |
366 | goto Cleanup; | |
367 | } | |
74f270af | 368 | |
7777fab9 | 369 | suspend_console(); |
c9e664f1 | 370 | pm_restrict_gfp_mask(); |
91e7c75b | 371 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 372 | if (error) |
d8f3de0d | 373 | goto Recover_platform; |
10a1803d | 374 | |
4cc79776 | 375 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 376 | goto Recover_platform; |
7777fab9 | 377 | |
4aecd671 | 378 | error = create_image(platform_mode); |
c9e664f1 RW |
379 | /* |
380 | * Control returns here (1) after the image has been created or the | |
381 | * image creation has failed and (2) after a successful restore. | |
382 | */ | |
4cc79776 | 383 | |
4cc79776 | 384 | Resume_devices: |
64a473cb RW |
385 | /* We may need to release the preallocated image pages here. */ |
386 | if (error || !in_suspend) | |
387 | swsusp_free(); | |
388 | ||
91e7c75b RW |
389 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
390 | dpm_resume(msg); | |
c9e664f1 RW |
391 | |
392 | if (error || !in_suspend) | |
393 | pm_restore_gfp_mask(); | |
394 | ||
7777fab9 | 395 | resume_console(); |
91e7c75b RW |
396 | dpm_complete(msg); |
397 | ||
caea99ef RW |
398 | Close: |
399 | platform_end(platform_mode); | |
7777fab9 | 400 | return error; |
d8f3de0d RW |
401 | |
402 | Recover_platform: | |
403 | platform_recover(platform_mode); | |
404 | goto Resume_devices; | |
bb58dd5d RW |
405 | |
406 | Cleanup: | |
407 | swsusp_free(); | |
408 | goto Close; | |
7777fab9 RW |
409 | } |
410 | ||
72df68ca | 411 | /** |
f42a9813 RW |
412 | * resume_target_kernel - Restore system state from a hibernation image. |
413 | * @platform_mode: Whether or not to use the platform driver. | |
414 | * | |
415 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of | |
416 | * highmem that have not been restored yet from the image and run the low-level | |
417 | * code that will restore the remaining contents of memory and switch to the | |
418 | * just restored target kernel. | |
72df68ca | 419 | */ |
4aecd671 | 420 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
421 | { |
422 | int error; | |
423 | ||
d1616302 | 424 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 425 | if (error) { |
23976728 | 426 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 427 | "aborting resume\n"); |
32bdfac5 | 428 | return error; |
72df68ca | 429 | } |
2ed8d2b3 | 430 | |
4aecd671 RW |
431 | error = platform_pre_restore(platform_mode); |
432 | if (error) | |
433 | goto Cleanup; | |
434 | ||
435 | error = disable_nonboot_cpus(); | |
436 | if (error) | |
437 | goto Enable_cpus; | |
438 | ||
2ed8d2b3 RW |
439 | local_irq_disable(); |
440 | ||
2e711c04 | 441 | error = syscore_suspend(); |
4aecd671 RW |
442 | if (error) |
443 | goto Enable_irqs; | |
444 | ||
72df68ca RW |
445 | save_processor_state(); |
446 | error = restore_highmem(); | |
447 | if (!error) { | |
448 | error = swsusp_arch_resume(); | |
449 | /* | |
450 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
451 | * Otherwise, execution continues at the place where |
452 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
453 | */ |
454 | BUG_ON(!error); | |
4e2d9491 RW |
455 | /* |
456 | * This call to restore_highmem() reverts the changes made by | |
457 | * the previous one. | |
458 | */ | |
72df68ca RW |
459 | restore_highmem(); |
460 | } | |
461 | /* | |
462 | * The only reason why swsusp_arch_resume() can fail is memory being | |
463 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 464 | * subsequent failures. |
72df68ca RW |
465 | */ |
466 | swsusp_free(); | |
467 | restore_processor_state(); | |
468 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 469 | |
40dc166c | 470 | syscore_resume(); |
2ed8d2b3 | 471 | |
4aecd671 | 472 | Enable_irqs: |
72df68ca | 473 | local_irq_enable(); |
2ed8d2b3 | 474 | |
4aecd671 RW |
475 | Enable_cpus: |
476 | enable_nonboot_cpus(); | |
477 | ||
478 | Cleanup: | |
479 | platform_restore_cleanup(platform_mode); | |
480 | ||
d1616302 | 481 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 482 | |
72df68ca RW |
483 | return error; |
484 | } | |
485 | ||
7777fab9 | 486 | /** |
f42a9813 RW |
487 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
488 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 489 | * |
f42a9813 | 490 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 491 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 492 | */ |
a634cc10 | 493 | int hibernation_restore(int platform_mode) |
7777fab9 | 494 | { |
cbe2f5a6 | 495 | int error; |
7777fab9 RW |
496 | |
497 | pm_prepare_console(); | |
498 | suspend_console(); | |
c9e664f1 | 499 | pm_restrict_gfp_mask(); |
d1616302 | 500 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 501 | if (!error) { |
4aecd671 | 502 | error = resume_target_kernel(platform_mode); |
d1616302 | 503 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 504 | } |
c9e664f1 | 505 | pm_restore_gfp_mask(); |
7777fab9 RW |
506 | resume_console(); |
507 | pm_restore_console(); | |
508 | return error; | |
509 | } | |
510 | ||
511 | /** | |
f42a9813 | 512 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 513 | */ |
7777fab9 RW |
514 | int hibernation_platform_enter(void) |
515 | { | |
cbe2f5a6 | 516 | int error; |
b1457bcc | 517 | |
9cd9a005 RW |
518 | if (!hibernation_ops) |
519 | return -ENOSYS; | |
520 | ||
521 | /* | |
522 | * We have cancelled the power transition by running | |
523 | * hibernation_ops->finish() before saving the image, so we should let | |
524 | * the firmware know that we're going to enter the sleep state after all | |
525 | */ | |
caea99ef | 526 | error = hibernation_ops->begin(); |
9cd9a005 | 527 | if (error) |
caea99ef | 528 | goto Close; |
9cd9a005 | 529 | |
abfe2d7b | 530 | entering_platform_hibernation = true; |
9cd9a005 | 531 | suspend_console(); |
d1616302 | 532 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
533 | if (error) { |
534 | if (hibernation_ops->recover) | |
535 | hibernation_ops->recover(); | |
536 | goto Resume_devices; | |
537 | } | |
9cd9a005 | 538 | |
d1616302 | 539 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 540 | if (error) |
32bdfac5 | 541 | goto Resume_devices; |
4aecd671 | 542 | |
9cd9a005 RW |
543 | error = hibernation_ops->prepare(); |
544 | if (error) | |
e681c9dd | 545 | goto Platform_finish; |
9cd9a005 RW |
546 | |
547 | error = disable_nonboot_cpus(); | |
548 | if (error) | |
e681c9dd | 549 | goto Platform_finish; |
2ed8d2b3 | 550 | |
4aecd671 | 551 | local_irq_disable(); |
40dc166c | 552 | syscore_suspend(); |
a2867e08 | 553 | if (pm_wakeup_pending()) { |
c125e96f RW |
554 | error = -EAGAIN; |
555 | goto Power_up; | |
556 | } | |
557 | ||
4aecd671 RW |
558 | hibernation_ops->enter(); |
559 | /* We should never get here */ | |
560 | while (1); | |
9cd9a005 | 561 | |
c125e96f | 562 | Power_up: |
40dc166c | 563 | syscore_resume(); |
c125e96f RW |
564 | local_irq_enable(); |
565 | enable_nonboot_cpus(); | |
566 | ||
e681c9dd | 567 | Platform_finish: |
9cd9a005 | 568 | hibernation_ops->finish(); |
2ed8d2b3 | 569 | |
f6f71f18 | 570 | dpm_resume_noirq(PMSG_RESTORE); |
4aecd671 | 571 | |
9cd9a005 | 572 | Resume_devices: |
abfe2d7b | 573 | entering_platform_hibernation = false; |
d1616302 | 574 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 575 | resume_console(); |
2ed8d2b3 | 576 | |
caea99ef RW |
577 | Close: |
578 | hibernation_ops->end(); | |
2ed8d2b3 | 579 | |
b1457bcc | 580 | return error; |
7777fab9 RW |
581 | } |
582 | ||
1da177e4 | 583 | /** |
f42a9813 | 584 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 585 | * |
f42a9813 RW |
586 | * Use the platform driver, if configured, to put the system into the sleep |
587 | * state corresponding to hibernation, or try to power it off or reboot, | |
588 | * depending on the value of hibernation_mode. | |
1da177e4 | 589 | */ |
fe0c935a | 590 | static void power_down(void) |
1da177e4 | 591 | { |
a3d25c27 RW |
592 | switch (hibernation_mode) { |
593 | case HIBERNATION_TEST: | |
594 | case HIBERNATION_TESTPROC: | |
fe0c935a | 595 | break; |
a3d25c27 | 596 | case HIBERNATION_REBOOT: |
fdde86ac | 597 | kernel_restart(NULL); |
1da177e4 | 598 | break; |
a3d25c27 | 599 | case HIBERNATION_PLATFORM: |
7777fab9 | 600 | hibernation_platform_enter(); |
9cd9a005 RW |
601 | case HIBERNATION_SHUTDOWN: |
602 | kernel_power_off(); | |
603 | break; | |
1da177e4 | 604 | } |
fdde86ac | 605 | kernel_halt(); |
fe0c935a JB |
606 | /* |
607 | * Valid image is on the disk, if we continue we risk serious data | |
608 | * corruption after resume. | |
609 | */ | |
23976728 | 610 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
611 | while(1); |
612 | } | |
613 | ||
1da177e4 LT |
614 | static int prepare_processes(void) |
615 | { | |
b918f6e6 | 616 | int error = 0; |
1da177e4 | 617 | |
1da177e4 LT |
618 | if (freeze_processes()) { |
619 | error = -EBUSY; | |
5a0a2f30 | 620 | thaw_processes(); |
1da177e4 | 621 | } |
5a72e04d | 622 | return error; |
1da177e4 LT |
623 | } |
624 | ||
1da177e4 | 625 | /** |
f42a9813 | 626 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 627 | */ |
a3d25c27 | 628 | int hibernate(void) |
1da177e4 LT |
629 | { |
630 | int error; | |
631 | ||
b10d9117 | 632 | mutex_lock(&pm_mutex); |
0709db60 | 633 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
634 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
635 | error = -EBUSY; | |
636 | goto Unlock; | |
637 | } | |
638 | ||
5a0a2f30 | 639 | pm_prepare_console(); |
b10d9117 RW |
640 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
641 | if (error) | |
642 | goto Exit; | |
0709db60 | 643 | |
1bfcf130 RW |
644 | error = usermodehelper_disable(); |
645 | if (error) | |
646 | goto Exit; | |
647 | ||
0709db60 RW |
648 | /* Allocate memory management structures */ |
649 | error = create_basic_memory_bitmaps(); | |
650 | if (error) | |
651 | goto Exit; | |
652 | ||
23976728 | 653 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
654 | sys_sync(); |
655 | printk("done.\n"); | |
656 | ||
1da177e4 | 657 | error = prepare_processes(); |
5a72e04d | 658 | if (error) |
0709db60 | 659 | goto Finish; |
1da177e4 | 660 | |
7777fab9 | 661 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
64a473cb RW |
662 | if (error) |
663 | goto Thaw; | |
aa9a7b11 SB |
664 | if (freezer_test_done) { |
665 | freezer_test_done = false; | |
666 | goto Thaw; | |
667 | } | |
64a473cb RW |
668 | |
669 | if (in_suspend) { | |
a634cc10 RW |
670 | unsigned int flags = 0; |
671 | ||
672 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
673 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
674 | if (nocompress) |
675 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
676 | else |
677 | flags |= SF_CRC32_MODE; | |
678 | ||
1da177e4 | 679 | pr_debug("PM: writing image.\n"); |
a634cc10 | 680 | error = swsusp_write(flags); |
7777fab9 | 681 | swsusp_free(); |
1da177e4 | 682 | if (!error) |
fe0c935a | 683 | power_down(); |
5262a475 | 684 | in_suspend = 0; |
c9e664f1 | 685 | pm_restore_gfp_mask(); |
b918f6e6 | 686 | } else { |
1da177e4 | 687 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 688 | } |
64a473cb | 689 | |
b918f6e6 | 690 | Thaw: |
5a0a2f30 | 691 | thaw_processes(); |
0709db60 RW |
692 | Finish: |
693 | free_basic_memory_bitmaps(); | |
1bfcf130 | 694 | usermodehelper_enable(); |
0709db60 | 695 | Exit: |
b10d9117 | 696 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 697 | pm_restore_console(); |
0709db60 | 698 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
699 | Unlock: |
700 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
701 | return error; |
702 | } | |
703 | ||
704 | ||
705 | /** | |
f42a9813 RW |
706 | * software_resume - Resume from a saved hibernation image. |
707 | * | |
708 | * This routine is called as a late initcall, when all devices have been | |
709 | * discovered and initialized already. | |
1da177e4 | 710 | * |
f42a9813 RW |
711 | * The image reading code is called to see if there is a hibernation image |
712 | * available for reading. If that is the case, devices are quiesced and the | |
713 | * contents of memory is restored from the saved image. | |
1da177e4 | 714 | * |
f42a9813 RW |
715 | * If this is successful, control reappears in the restored target kernel in |
716 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
717 | * attempts to recover gracefully and make the kernel return to the normal mode | |
718 | * of operation. | |
1da177e4 | 719 | */ |
1da177e4 LT |
720 | static int software_resume(void) |
721 | { | |
722 | int error; | |
a634cc10 | 723 | unsigned int flags; |
1da177e4 | 724 | |
eed3ee08 AV |
725 | /* |
726 | * If the user said "noresume".. bail out early. | |
727 | */ | |
728 | if (noresume) | |
729 | return 0; | |
730 | ||
60a0d233 JB |
731 | /* |
732 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
733 | * is configured into the kernel. Since the regular hibernate | |
734 | * trigger path is via sysfs which takes a buffer mutex before | |
735 | * calling hibernate functions (which take pm_mutex) this can | |
736 | * cause lockdep to complain about a possible ABBA deadlock | |
737 | * which cannot happen since we're in the boot code here and | |
738 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
739 | * here to avoid lockdep complaining. | |
740 | */ | |
741 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
742 | |
743 | if (swsusp_resume_device) | |
744 | goto Check_image; | |
745 | ||
746 | if (!strlen(resume_file)) { | |
747 | error = -ENOENT; | |
748 | goto Unlock; | |
749 | } | |
750 | ||
d0941ead | 751 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 752 | |
f126f733 BS |
753 | if (resume_delay) { |
754 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
755 | resume_delay); | |
756 | ssleep(resume_delay); | |
757 | } | |
758 | ||
0c8454f5 RW |
759 | /* Check if the device is there */ |
760 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 761 | if (!swsusp_resume_device) { |
eed3ee08 AV |
762 | /* |
763 | * Some device discovery might still be in progress; we need | |
764 | * to wait for this to finish. | |
765 | */ | |
766 | wait_for_device_probe(); | |
6f8d7022 BS |
767 | |
768 | if (resume_wait) { | |
769 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
770 | msleep(10); | |
771 | async_synchronize_full(); | |
772 | } | |
773 | ||
0c8454f5 RW |
774 | /* |
775 | * We can't depend on SCSI devices being available after loading | |
776 | * one of their modules until scsi_complete_async_scans() is | |
777 | * called and the resume device usually is a SCSI one. | |
778 | */ | |
779 | scsi_complete_async_scans(); | |
780 | ||
3efa147a | 781 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
782 | if (!swsusp_resume_device) { |
783 | error = -ENODEV; | |
784 | goto Unlock; | |
785 | } | |
3efa147a PM |
786 | } |
787 | ||
0c8454f5 | 788 | Check_image: |
d0941ead | 789 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 790 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 791 | |
d0941ead | 792 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
793 | error = swsusp_check(); |
794 | if (error) | |
74dfd666 | 795 | goto Unlock; |
1da177e4 | 796 | |
0709db60 RW |
797 | /* The snapshot device should not be opened while we're running */ |
798 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
799 | error = -EBUSY; | |
76b57e61 | 800 | swsusp_close(FMODE_READ); |
0709db60 RW |
801 | goto Unlock; |
802 | } | |
803 | ||
5a0a2f30 | 804 | pm_prepare_console(); |
c3e94d89 AS |
805 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
806 | if (error) | |
76b57e61 | 807 | goto close_finish; |
c3e94d89 | 808 | |
1bfcf130 RW |
809 | error = usermodehelper_disable(); |
810 | if (error) | |
76b57e61 | 811 | goto close_finish; |
1bfcf130 | 812 | |
74dfd666 RW |
813 | error = create_basic_memory_bitmaps(); |
814 | if (error) | |
76b57e61 | 815 | goto close_finish; |
1da177e4 | 816 | |
74dfd666 | 817 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
818 | error = prepare_processes(); |
819 | if (error) { | |
c2dd0dae | 820 | swsusp_close(FMODE_READ); |
5a72e04d | 821 | goto Done; |
1da177e4 LT |
822 | } |
823 | ||
d0941ead | 824 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 825 | |
a634cc10 | 826 | error = swsusp_read(&flags); |
76b57e61 | 827 | swsusp_close(FMODE_READ); |
ed746e3b | 828 | if (!error) |
a634cc10 | 829 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 830 | |
d0941ead | 831 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 832 | swsusp_free(); |
5a0a2f30 | 833 | thaw_processes(); |
1da177e4 | 834 | Done: |
74dfd666 | 835 | free_basic_memory_bitmaps(); |
1bfcf130 | 836 | usermodehelper_enable(); |
0709db60 | 837 | Finish: |
c3e94d89 | 838 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 839 | pm_restore_console(); |
0709db60 | 840 | atomic_inc(&snapshot_device_available); |
dd5d666b | 841 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 842 | Unlock: |
a6d70980 | 843 | mutex_unlock(&pm_mutex); |
d0941ead | 844 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 845 | return error; |
76b57e61 JS |
846 | close_finish: |
847 | swsusp_close(FMODE_READ); | |
848 | goto Finish; | |
1da177e4 LT |
849 | } |
850 | ||
851 | late_initcall(software_resume); | |
852 | ||
853 | ||
a3d25c27 RW |
854 | static const char * const hibernation_modes[] = { |
855 | [HIBERNATION_PLATFORM] = "platform", | |
856 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
857 | [HIBERNATION_REBOOT] = "reboot", | |
858 | [HIBERNATION_TEST] = "test", | |
859 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
860 | }; |
861 | ||
f42a9813 RW |
862 | /* |
863 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 864 | * |
f42a9813 RW |
865 | * Hibernation can be handled in several ways. There are a few different ways |
866 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
867 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
868 | * mostly), or using one of the two available test modes. | |
1da177e4 | 869 | * |
f42a9813 RW |
870 | * The sysfs file /sys/power/disk provides an interface for selecting the |
871 | * hibernation mode to use. Reading from this file causes the available modes | |
872 | * to be printed. There are 5 modes that can be supported: | |
1da177e4 | 873 | * |
1da177e4 LT |
874 | * 'platform' |
875 | * 'shutdown' | |
876 | * 'reboot' | |
11d77d0c JB |
877 | * 'test' |
878 | * 'testproc' | |
1da177e4 | 879 | * |
f42a9813 RW |
880 | * If a platform hibernation driver is in use, 'platform' will be supported |
881 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
882 | * The selected option (i.e. the one corresponding to the current value of | |
883 | * hibernation_mode) is enclosed by a square bracket. | |
884 | * | |
885 | * To select a given hibernation mode it is necessary to write the mode's | |
886 | * string representation (as returned by reading from /sys/power/disk) back | |
887 | * into /sys/power/disk. | |
1da177e4 LT |
888 | */ |
889 | ||
386f275f KS |
890 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
891 | char *buf) | |
1da177e4 | 892 | { |
f0ced9b2 JB |
893 | int i; |
894 | char *start = buf; | |
895 | ||
a3d25c27 RW |
896 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
897 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
898 | continue; |
899 | switch (i) { | |
a3d25c27 RW |
900 | case HIBERNATION_SHUTDOWN: |
901 | case HIBERNATION_REBOOT: | |
902 | case HIBERNATION_TEST: | |
903 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 904 | break; |
a3d25c27 RW |
905 | case HIBERNATION_PLATFORM: |
906 | if (hibernation_ops) | |
f0ced9b2 JB |
907 | break; |
908 | /* not a valid mode, continue with loop */ | |
909 | continue; | |
910 | } | |
a3d25c27 RW |
911 | if (i == hibernation_mode) |
912 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 913 | else |
a3d25c27 | 914 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
915 | } |
916 | buf += sprintf(buf, "\n"); | |
917 | return buf-start; | |
1da177e4 LT |
918 | } |
919 | ||
386f275f KS |
920 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
921 | const char *buf, size_t n) | |
1da177e4 LT |
922 | { |
923 | int error = 0; | |
924 | int i; | |
925 | int len; | |
926 | char *p; | |
a3d25c27 | 927 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
928 | |
929 | p = memchr(buf, '\n', n); | |
930 | len = p ? p - buf : n; | |
931 | ||
a6d70980 | 932 | mutex_lock(&pm_mutex); |
a3d25c27 | 933 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
934 | if (len == strlen(hibernation_modes[i]) |
935 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
936 | mode = i; |
937 | break; | |
938 | } | |
939 | } | |
a3d25c27 | 940 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 941 | switch (mode) { |
a3d25c27 RW |
942 | case HIBERNATION_SHUTDOWN: |
943 | case HIBERNATION_REBOOT: | |
944 | case HIBERNATION_TEST: | |
945 | case HIBERNATION_TESTPROC: | |
946 | hibernation_mode = mode; | |
fe0c935a | 947 | break; |
a3d25c27 RW |
948 | case HIBERNATION_PLATFORM: |
949 | if (hibernation_ops) | |
950 | hibernation_mode = mode; | |
1da177e4 LT |
951 | else |
952 | error = -EINVAL; | |
953 | } | |
a3d25c27 | 954 | } else |
1da177e4 LT |
955 | error = -EINVAL; |
956 | ||
a3d25c27 | 957 | if (!error) |
23976728 | 958 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 959 | hibernation_modes[mode]); |
a6d70980 | 960 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
961 | return error ? error : n; |
962 | } | |
963 | ||
964 | power_attr(disk); | |
965 | ||
386f275f KS |
966 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
967 | char *buf) | |
1da177e4 LT |
968 | { |
969 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
970 | MINOR(swsusp_resume_device)); | |
971 | } | |
972 | ||
386f275f KS |
973 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
974 | const char *buf, size_t n) | |
1da177e4 | 975 | { |
1da177e4 | 976 | unsigned int maj, min; |
1da177e4 | 977 | dev_t res; |
a576219a | 978 | int ret = -EINVAL; |
1da177e4 | 979 | |
a576219a AM |
980 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
981 | goto out; | |
1da177e4 | 982 | |
a576219a AM |
983 | res = MKDEV(maj,min); |
984 | if (maj != MAJOR(res) || min != MINOR(res)) | |
985 | goto out; | |
1da177e4 | 986 | |
a6d70980 | 987 | mutex_lock(&pm_mutex); |
a576219a | 988 | swsusp_resume_device = res; |
a6d70980 | 989 | mutex_unlock(&pm_mutex); |
23976728 | 990 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
991 | noresume = 0; |
992 | software_resume(); | |
993 | ret = n; | |
59a49335 | 994 | out: |
a576219a | 995 | return ret; |
1da177e4 LT |
996 | } |
997 | ||
998 | power_attr(resume); | |
999 | ||
386f275f KS |
1000 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1001 | char *buf) | |
ca0aec0f | 1002 | { |
853609b6 | 1003 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1004 | } |
1005 | ||
386f275f KS |
1006 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1007 | const char *buf, size_t n) | |
ca0aec0f | 1008 | { |
853609b6 | 1009 | unsigned long size; |
ca0aec0f | 1010 | |
853609b6 | 1011 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1012 | image_size = size; |
1013 | return n; | |
1014 | } | |
1015 | ||
1016 | return -EINVAL; | |
1017 | } | |
1018 | ||
1019 | power_attr(image_size); | |
1020 | ||
ddeb6487 RW |
1021 | static ssize_t reserved_size_show(struct kobject *kobj, |
1022 | struct kobj_attribute *attr, char *buf) | |
1023 | { | |
1024 | return sprintf(buf, "%lu\n", reserved_size); | |
1025 | } | |
1026 | ||
1027 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1028 | struct kobj_attribute *attr, | |
1029 | const char *buf, size_t n) | |
1030 | { | |
1031 | unsigned long size; | |
1032 | ||
1033 | if (sscanf(buf, "%lu", &size) == 1) { | |
1034 | reserved_size = size; | |
1035 | return n; | |
1036 | } | |
1037 | ||
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
1041 | power_attr(reserved_size); | |
1042 | ||
1da177e4 LT |
1043 | static struct attribute * g[] = { |
1044 | &disk_attr.attr, | |
1045 | &resume_attr.attr, | |
ca0aec0f | 1046 | &image_size_attr.attr, |
ddeb6487 | 1047 | &reserved_size_attr.attr, |
1da177e4 LT |
1048 | NULL, |
1049 | }; | |
1050 | ||
1051 | ||
1052 | static struct attribute_group attr_group = { | |
1053 | .attrs = g, | |
1054 | }; | |
1055 | ||
1056 | ||
1057 | static int __init pm_disk_init(void) | |
1058 | { | |
d76e15fb | 1059 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1060 | } |
1061 | ||
1062 | core_initcall(pm_disk_init); | |
1063 | ||
1064 | ||
1065 | static int __init resume_setup(char *str) | |
1066 | { | |
1067 | if (noresume) | |
1068 | return 1; | |
1069 | ||
1070 | strncpy( resume_file, str, 255 ); | |
1071 | return 1; | |
1072 | } | |
1073 | ||
9a154d9d RW |
1074 | static int __init resume_offset_setup(char *str) |
1075 | { | |
1076 | unsigned long long offset; | |
1077 | ||
1078 | if (noresume) | |
1079 | return 1; | |
1080 | ||
1081 | if (sscanf(str, "%llu", &offset) == 1) | |
1082 | swsusp_resume_block = offset; | |
1083 | ||
1084 | return 1; | |
1085 | } | |
1086 | ||
f996fc96 BS |
1087 | static int __init hibernate_setup(char *str) |
1088 | { | |
1089 | if (!strncmp(str, "noresume", 8)) | |
1090 | noresume = 1; | |
1091 | else if (!strncmp(str, "nocompress", 10)) | |
1092 | nocompress = 1; | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | static int __init noresume_setup(char *str) |
1097 | { | |
1098 | noresume = 1; | |
1099 | return 1; | |
1100 | } | |
1101 | ||
6f8d7022 BS |
1102 | static int __init resumewait_setup(char *str) |
1103 | { | |
1104 | resume_wait = 1; | |
1105 | return 1; | |
1106 | } | |
1107 | ||
f126f733 BS |
1108 | static int __init resumedelay_setup(char *str) |
1109 | { | |
1110 | resume_delay = simple_strtoul(str, NULL, 0); | |
1111 | return 1; | |
1112 | } | |
1113 | ||
1da177e4 | 1114 | __setup("noresume", noresume_setup); |
9a154d9d | 1115 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1116 | __setup("resume=", resume_setup); |
f996fc96 | 1117 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1118 | __setup("resumewait", resumewait_setup); |
f126f733 | 1119 | __setup("resumedelay=", resumedelay_setup); |