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. |
62c552cc | 8 | * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com> |
1da177e4 LT |
9 | * |
10 | * This file is released under the GPLv2. | |
1da177e4 LT |
11 | */ |
12 | ||
6e5fdeed | 13 | #include <linux/export.h> |
1da177e4 LT |
14 | #include <linux/suspend.h> |
15 | #include <linux/syscalls.h> | |
16 | #include <linux/reboot.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/device.h> | |
6f8d7022 | 19 | #include <linux/async.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> |
2df83fa4 MB |
29 | #include <linux/ctype.h> |
30 | #include <linux/genhd.h> | |
db597605 | 31 | #include <linux/ktime.h> |
bb3632c6 | 32 | #include <trace/events/power.h> |
d53d9f16 | 33 | |
1da177e4 LT |
34 | #include "power.h" |
35 | ||
36 | ||
d231ff1a BS |
37 | static int nocompress; |
38 | static int noresume; | |
a6e15a39 | 39 | static int nohibernate; |
d231ff1a | 40 | static int resume_wait; |
f6514be5 | 41 | static unsigned int resume_delay; |
47a460d5 | 42 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 43 | dev_t swsusp_resume_device; |
9a154d9d | 44 | sector_t swsusp_resume_block; |
d6efc2f7 | 45 | __visible int in_suspend __nosavedata; |
1da177e4 | 46 | |
a3d25c27 RW |
47 | enum { |
48 | HIBERNATION_INVALID, | |
49 | HIBERNATION_PLATFORM, | |
a3d25c27 RW |
50 | HIBERNATION_SHUTDOWN, |
51 | HIBERNATION_REBOOT, | |
62c552cc BS |
52 | #ifdef CONFIG_SUSPEND |
53 | HIBERNATION_SUSPEND, | |
54 | #endif | |
a3d25c27 RW |
55 | /* keep last */ |
56 | __HIBERNATION_AFTER_LAST | |
57 | }; | |
58 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
59 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
60 | ||
61 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
62 | ||
97819a26 | 63 | bool freezer_test_done; |
aa9a7b11 | 64 | |
073ef1f6 | 65 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 | 66 | |
a6e15a39 KC |
67 | bool hibernation_available(void) |
68 | { | |
69 | return (nohibernate == 0); | |
70 | } | |
71 | ||
a3d25c27 | 72 | /** |
f42a9813 RW |
73 | * hibernation_set_ops - Set the global hibernate operations. |
74 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 75 | */ |
073ef1f6 | 76 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 77 | { |
caea99ef RW |
78 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
79 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 80 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
81 | WARN_ON(1); |
82 | return; | |
83 | } | |
bcda53fa | 84 | lock_system_sleep(); |
a3d25c27 RW |
85 | hibernation_ops = ops; |
86 | if (ops) | |
87 | hibernation_mode = HIBERNATION_PLATFORM; | |
88 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
89 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
90 | ||
bcda53fa | 91 | unlock_system_sleep(); |
a3d25c27 | 92 | } |
e0c7855e | 93 | EXPORT_SYMBOL_GPL(hibernation_set_ops); |
a3d25c27 | 94 | |
abfe2d7b RW |
95 | static bool entering_platform_hibernation; |
96 | ||
97 | bool system_entering_hibernation(void) | |
98 | { | |
99 | return entering_platform_hibernation; | |
100 | } | |
101 | EXPORT_SYMBOL(system_entering_hibernation); | |
102 | ||
4cc79776 RW |
103 | #ifdef CONFIG_PM_DEBUG |
104 | static void hibernation_debug_sleep(void) | |
105 | { | |
106 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
107 | mdelay(5000); | |
108 | } | |
109 | ||
4cc79776 RW |
110 | static int hibernation_test(int level) |
111 | { | |
112 | if (pm_test_level == level) { | |
113 | hibernation_debug_sleep(); | |
114 | return 1; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | #else /* !CONFIG_PM_DEBUG */ | |
4cc79776 RW |
119 | static int hibernation_test(int level) { return 0; } |
120 | #endif /* !CONFIG_PM_DEBUG */ | |
121 | ||
74f270af | 122 | /** |
f42a9813 RW |
123 | * platform_begin - Call platform to start hibernation. |
124 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 125 | */ |
caea99ef | 126 | static int platform_begin(int platform_mode) |
74f270af RW |
127 | { |
128 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
129 | hibernation_ops->begin() : 0; |
130 | } | |
131 | ||
132 | /** | |
f42a9813 RW |
133 | * platform_end - Call platform to finish transition to the working state. |
134 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 135 | */ |
caea99ef RW |
136 | static void platform_end(int platform_mode) |
137 | { | |
138 | if (platform_mode && hibernation_ops) | |
139 | hibernation_ops->end(); | |
74f270af | 140 | } |
a3d25c27 | 141 | |
8a05aac2 | 142 | /** |
f42a9813 RW |
143 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
144 | * @platform_mode: Whether or not to use the platform driver. | |
145 | * | |
146 | * Use the platform driver to prepare the system for creating a hibernate image, | |
147 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
148 | */ |
149 | ||
74f270af | 150 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 151 | { |
7777fab9 | 152 | return (platform_mode && hibernation_ops) ? |
74f270af | 153 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 154 | } |
8a05aac2 | 155 | |
c7e0831d | 156 | /** |
f42a9813 RW |
157 | * platform_leave - Call platform to prepare a transition to the working state. |
158 | * @platform_mode: Whether or not to use the platform driver. | |
159 | * | |
160 | * Use the platform driver prepare to prepare the machine for switching to the | |
161 | * normal mode of operation. | |
162 | * | |
163 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 164 | */ |
c7e0831d RW |
165 | static void platform_leave(int platform_mode) |
166 | { | |
167 | if (platform_mode && hibernation_ops) | |
168 | hibernation_ops->leave(); | |
169 | } | |
170 | ||
a3d25c27 | 171 | /** |
f42a9813 RW |
172 | * platform_finish - Call platform to switch the system to the working state. |
173 | * @platform_mode: Whether or not to use the platform driver. | |
174 | * | |
175 | * Use the platform driver to switch the machine to the normal mode of | |
176 | * operation. | |
177 | * | |
178 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 179 | */ |
7777fab9 | 180 | static void platform_finish(int platform_mode) |
a3d25c27 | 181 | { |
7777fab9 | 182 | if (platform_mode && hibernation_ops) |
a3d25c27 | 183 | hibernation_ops->finish(); |
8a05aac2 SS |
184 | } |
185 | ||
a634cc10 | 186 | /** |
f42a9813 RW |
187 | * platform_pre_restore - Prepare for hibernate image restoration. |
188 | * @platform_mode: Whether or not to use the platform driver. | |
189 | * | |
190 | * Use the platform driver to prepare the system for resume from a hibernation | |
191 | * image. | |
192 | * | |
193 | * If the restore fails after this function has been called, | |
194 | * platform_restore_cleanup() must be called. | |
a634cc10 | 195 | */ |
a634cc10 RW |
196 | static int platform_pre_restore(int platform_mode) |
197 | { | |
198 | return (platform_mode && hibernation_ops) ? | |
199 | hibernation_ops->pre_restore() : 0; | |
200 | } | |
201 | ||
202 | /** | |
f42a9813 RW |
203 | * platform_restore_cleanup - Switch to the working state after failing restore. |
204 | * @platform_mode: Whether or not to use the platform driver. | |
205 | * | |
206 | * Use the platform driver to switch the system to the normal mode of operation | |
207 | * after a failing restore. | |
208 | * | |
209 | * If platform_pre_restore() has been called before the failing restore, this | |
210 | * function must be called too, regardless of the result of | |
211 | * platform_pre_restore(). | |
a634cc10 | 212 | */ |
a634cc10 RW |
213 | static void platform_restore_cleanup(int platform_mode) |
214 | { | |
215 | if (platform_mode && hibernation_ops) | |
216 | hibernation_ops->restore_cleanup(); | |
217 | } | |
218 | ||
d8f3de0d | 219 | /** |
f42a9813 RW |
220 | * platform_recover - Recover from a failure to suspend devices. |
221 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 222 | */ |
d8f3de0d RW |
223 | static void platform_recover(int platform_mode) |
224 | { | |
225 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
226 | hibernation_ops->recover(); | |
227 | } | |
228 | ||
8e60c6a1 | 229 | /** |
f42a9813 RW |
230 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
231 | * @start: Starting event. | |
232 | * @stop: Final event. | |
233 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
234 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 235 | */ |
db597605 TR |
236 | void swsusp_show_speed(ktime_t start, ktime_t stop, |
237 | unsigned nr_pages, char *msg) | |
8e60c6a1 | 238 | { |
db597605 | 239 | ktime_t diff; |
4881f603 CG |
240 | u64 elapsed_centisecs64; |
241 | unsigned int centisecs; | |
242 | unsigned int k; | |
243 | unsigned int kps; | |
8e60c6a1 | 244 | |
db597605 TR |
245 | diff = ktime_sub(stop, start); |
246 | elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC); | |
8e60c6a1 NC |
247 | centisecs = elapsed_centisecs64; |
248 | if (centisecs == 0) | |
249 | centisecs = 1; /* avoid div-by-zero */ | |
250 | k = nr_pages * (PAGE_SIZE / 1024); | |
251 | kps = (k * 100) / centisecs; | |
4881f603 | 252 | printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n", |
8e60c6a1 NC |
253 | msg, k, |
254 | centisecs / 100, centisecs % 100, | |
255 | kps / 1000, (kps % 1000) / 10); | |
256 | } | |
257 | ||
c7e0831d | 258 | /** |
f42a9813 RW |
259 | * create_image - Create a hibernation image. |
260 | * @platform_mode: Whether or not to use the platform driver. | |
261 | * | |
cf579dfb RW |
262 | * Execute device drivers' "late" and "noirq" freeze callbacks, create a |
263 | * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. | |
f42a9813 RW |
264 | * |
265 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 266 | */ |
47a460d5 | 267 | static int create_image(int platform_mode) |
c7e0831d RW |
268 | { |
269 | int error; | |
270 | ||
cf579dfb | 271 | error = dpm_suspend_end(PMSG_FREEZE); |
c7e0831d | 272 | if (error) { |
23976728 RW |
273 | printk(KERN_ERR "PM: Some devices failed to power down, " |
274 | "aborting hibernation\n"); | |
32bdfac5 | 275 | return error; |
c7e0831d | 276 | } |
2ed8d2b3 | 277 | |
4aecd671 RW |
278 | error = platform_pre_snapshot(platform_mode); |
279 | if (error || hibernation_test(TEST_PLATFORM)) | |
280 | goto Platform_finish; | |
281 | ||
282 | error = disable_nonboot_cpus(); | |
48580ab8 | 283 | if (error || hibernation_test(TEST_CPUS)) |
4aecd671 RW |
284 | goto Enable_cpus; |
285 | ||
2ed8d2b3 RW |
286 | local_irq_disable(); |
287 | ||
2e711c04 | 288 | error = syscore_suspend(); |
770824bd | 289 | if (error) { |
4484079d | 290 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 291 | "aborting hibernation\n"); |
4aecd671 | 292 | goto Enable_irqs; |
770824bd | 293 | } |
c7e0831d | 294 | |
a2867e08 | 295 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
296 | goto Power_up; |
297 | ||
298 | in_suspend = 1; | |
c7e0831d | 299 | save_processor_state(); |
bb3632c6 | 300 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true); |
c7e0831d | 301 | error = swsusp_arch_suspend(); |
bb3632c6 | 302 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false); |
c7e0831d | 303 | if (error) |
23976728 RW |
304 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
305 | error); | |
c7e0831d RW |
306 | /* Restore control flow magically appears here */ |
307 | restore_processor_state(); | |
362e77d1 | 308 | if (!in_suspend) |
c125e96f | 309 | events_check_enabled = false; |
362e77d1 BM |
310 | |
311 | platform_leave(platform_mode); | |
4aecd671 | 312 | |
4cc79776 | 313 | Power_up: |
40dc166c | 314 | syscore_resume(); |
2ed8d2b3 | 315 | |
4aecd671 | 316 | Enable_irqs: |
2ed8d2b3 RW |
317 | local_irq_enable(); |
318 | ||
4aecd671 RW |
319 | Enable_cpus: |
320 | enable_nonboot_cpus(); | |
321 | ||
322 | Platform_finish: | |
323 | platform_finish(platform_mode); | |
324 | ||
cf579dfb | 325 | dpm_resume_start(in_suspend ? |
1eede070 | 326 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 327 | |
c7e0831d RW |
328 | return error; |
329 | } | |
330 | ||
7777fab9 | 331 | /** |
f42a9813 RW |
332 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
333 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 334 | * |
f42a9813 | 335 | * This routine must be called with pm_mutex held. |
7777fab9 | 336 | */ |
7777fab9 RW |
337 | int hibernation_snapshot(int platform_mode) |
338 | { | |
953a2063 | 339 | pm_message_t msg; |
cbe2f5a6 | 340 | int error; |
7777fab9 | 341 | |
3fe0313e | 342 | error = platform_begin(platform_mode); |
7777fab9 | 343 | if (error) |
d074ee02 | 344 | goto Close; |
7777fab9 | 345 | |
64a473cb RW |
346 | /* Preallocate image memory before shutting down devices. */ |
347 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
348 | if (error) |
349 | goto Close; | |
350 | ||
351 | error = freeze_kernel_threads(); | |
352 | if (error) | |
bb58dd5d | 353 | goto Cleanup; |
2aede851 | 354 | |
48580ab8 | 355 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
356 | |
357 | /* | |
358 | * Indicate to the caller that we are returning due to a | |
359 | * successful freezer test. | |
360 | */ | |
361 | freezer_test_done = true; | |
51d6ff7a | 362 | goto Thaw; |
aa9a7b11 SB |
363 | } |
364 | ||
2aede851 | 365 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 366 | if (error) { |
953a2063 | 367 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 368 | goto Thaw; |
bb58dd5d | 369 | } |
74f270af | 370 | |
7777fab9 | 371 | suspend_console(); |
c9e664f1 | 372 | pm_restrict_gfp_mask(); |
953a2063 | 373 | |
91e7c75b | 374 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 375 | |
953a2063 SB |
376 | if (error || hibernation_test(TEST_DEVICES)) |
377 | platform_recover(platform_mode); | |
378 | else | |
379 | error = create_image(platform_mode); | |
7777fab9 | 380 | |
c9e664f1 | 381 | /* |
953a2063 SB |
382 | * In the case that we call create_image() above, the control |
383 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
384 | * image creation has failed and (2) after a successful restore. |
385 | */ | |
4cc79776 | 386 | |
64a473cb RW |
387 | /* We may need to release the preallocated image pages here. */ |
388 | if (error || !in_suspend) | |
389 | swsusp_free(); | |
390 | ||
91e7c75b RW |
391 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
392 | dpm_resume(msg); | |
c9e664f1 RW |
393 | |
394 | if (error || !in_suspend) | |
395 | pm_restore_gfp_mask(); | |
396 | ||
7777fab9 | 397 | resume_console(); |
91e7c75b RW |
398 | dpm_complete(msg); |
399 | ||
caea99ef RW |
400 | Close: |
401 | platform_end(platform_mode); | |
7777fab9 | 402 | return error; |
d8f3de0d | 403 | |
51d6ff7a SB |
404 | Thaw: |
405 | thaw_kernel_threads(); | |
bb58dd5d RW |
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 | * | |
cf579dfb RW |
415 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
416 | * contents of highmem that have not been restored yet from the image and run | |
417 | * the low-level code that will restore the remaining contents of memory and | |
418 | * switch to the just restored target kernel. | |
72df68ca | 419 | */ |
4aecd671 | 420 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
421 | { |
422 | int error; | |
423 | ||
cf579dfb | 424 | error = dpm_suspend_end(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 | ||
cf579dfb | 481 | dpm_resume_start(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); |
94fb823f ID |
503 | /* |
504 | * The above should either succeed and jump to the new kernel, | |
505 | * or return with an error. Otherwise things are just | |
506 | * undefined, so let's be paranoid. | |
507 | */ | |
508 | BUG_ON(!error); | |
a634cc10 | 509 | } |
94fb823f | 510 | dpm_resume_end(PMSG_RECOVER); |
c9e664f1 | 511 | pm_restore_gfp_mask(); |
7777fab9 RW |
512 | resume_console(); |
513 | pm_restore_console(); | |
514 | return error; | |
515 | } | |
516 | ||
517 | /** | |
f42a9813 | 518 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 519 | */ |
7777fab9 RW |
520 | int hibernation_platform_enter(void) |
521 | { | |
cbe2f5a6 | 522 | int error; |
b1457bcc | 523 | |
9cd9a005 RW |
524 | if (!hibernation_ops) |
525 | return -ENOSYS; | |
526 | ||
527 | /* | |
528 | * We have cancelled the power transition by running | |
529 | * hibernation_ops->finish() before saving the image, so we should let | |
530 | * the firmware know that we're going to enter the sleep state after all | |
531 | */ | |
caea99ef | 532 | error = hibernation_ops->begin(); |
9cd9a005 | 533 | if (error) |
caea99ef | 534 | goto Close; |
9cd9a005 | 535 | |
abfe2d7b | 536 | entering_platform_hibernation = true; |
9cd9a005 | 537 | suspend_console(); |
d1616302 | 538 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
539 | if (error) { |
540 | if (hibernation_ops->recover) | |
541 | hibernation_ops->recover(); | |
542 | goto Resume_devices; | |
543 | } | |
9cd9a005 | 544 | |
cf579dfb | 545 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 546 | if (error) |
32bdfac5 | 547 | goto Resume_devices; |
4aecd671 | 548 | |
9cd9a005 RW |
549 | error = hibernation_ops->prepare(); |
550 | if (error) | |
e681c9dd | 551 | goto Platform_finish; |
9cd9a005 RW |
552 | |
553 | error = disable_nonboot_cpus(); | |
554 | if (error) | |
8c506608 | 555 | goto Enable_cpus; |
2ed8d2b3 | 556 | |
4aecd671 | 557 | local_irq_disable(); |
40dc166c | 558 | syscore_suspend(); |
a2867e08 | 559 | if (pm_wakeup_pending()) { |
c125e96f RW |
560 | error = -EAGAIN; |
561 | goto Power_up; | |
562 | } | |
563 | ||
4aecd671 RW |
564 | hibernation_ops->enter(); |
565 | /* We should never get here */ | |
566 | while (1); | |
9cd9a005 | 567 | |
c125e96f | 568 | Power_up: |
40dc166c | 569 | syscore_resume(); |
c125e96f | 570 | local_irq_enable(); |
8c506608 VK |
571 | |
572 | Enable_cpus: | |
c125e96f RW |
573 | enable_nonboot_cpus(); |
574 | ||
e681c9dd | 575 | Platform_finish: |
9cd9a005 | 576 | hibernation_ops->finish(); |
2ed8d2b3 | 577 | |
cf579dfb | 578 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 579 | |
9cd9a005 | 580 | Resume_devices: |
abfe2d7b | 581 | entering_platform_hibernation = false; |
d1616302 | 582 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 583 | resume_console(); |
2ed8d2b3 | 584 | |
caea99ef RW |
585 | Close: |
586 | hibernation_ops->end(); | |
2ed8d2b3 | 587 | |
b1457bcc | 588 | return error; |
7777fab9 RW |
589 | } |
590 | ||
1da177e4 | 591 | /** |
f42a9813 | 592 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 593 | * |
f42a9813 RW |
594 | * Use the platform driver, if configured, to put the system into the sleep |
595 | * state corresponding to hibernation, or try to power it off or reboot, | |
596 | * depending on the value of hibernation_mode. | |
1da177e4 | 597 | */ |
fe0c935a | 598 | static void power_down(void) |
1da177e4 | 599 | { |
62c552cc BS |
600 | #ifdef CONFIG_SUSPEND |
601 | int error; | |
602 | #endif | |
603 | ||
a3d25c27 | 604 | switch (hibernation_mode) { |
a3d25c27 | 605 | case HIBERNATION_REBOOT: |
fdde86ac | 606 | kernel_restart(NULL); |
1da177e4 | 607 | break; |
a3d25c27 | 608 | case HIBERNATION_PLATFORM: |
7777fab9 | 609 | hibernation_platform_enter(); |
9cd9a005 | 610 | case HIBERNATION_SHUTDOWN: |
2c730785 SC |
611 | if (pm_power_off) |
612 | kernel_power_off(); | |
9cd9a005 | 613 | break; |
62c552cc BS |
614 | #ifdef CONFIG_SUSPEND |
615 | case HIBERNATION_SUSPEND: | |
616 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
617 | if (error) { | |
618 | if (hibernation_ops) | |
619 | hibernation_mode = HIBERNATION_PLATFORM; | |
620 | else | |
621 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
622 | power_down(); | |
623 | } | |
624 | /* | |
625 | * Restore swap signature. | |
626 | */ | |
627 | error = swsusp_unmark(); | |
628 | if (error) | |
629 | printk(KERN_ERR "PM: Swap will be unusable! " | |
630 | "Try swapon -a.\n"); | |
631 | return; | |
632 | #endif | |
1da177e4 | 633 | } |
fdde86ac | 634 | kernel_halt(); |
fe0c935a JB |
635 | /* |
636 | * Valid image is on the disk, if we continue we risk serious data | |
637 | * corruption after resume. | |
638 | */ | |
23976728 | 639 | printk(KERN_CRIT "PM: Please power down manually\n"); |
2c730785 SC |
640 | while (1) |
641 | cpu_relax(); | |
1da177e4 LT |
642 | } |
643 | ||
1da177e4 | 644 | /** |
f42a9813 | 645 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 646 | */ |
a3d25c27 | 647 | int hibernate(void) |
1da177e4 LT |
648 | { |
649 | int error; | |
650 | ||
a6e15a39 KC |
651 | if (!hibernation_available()) { |
652 | pr_debug("PM: Hibernation not available.\n"); | |
653 | return -EPERM; | |
654 | } | |
655 | ||
bcda53fa | 656 | lock_system_sleep(); |
0709db60 | 657 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
658 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
659 | error = -EBUSY; | |
660 | goto Unlock; | |
661 | } | |
662 | ||
5a0a2f30 | 663 | pm_prepare_console(); |
b10d9117 RW |
664 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
665 | if (error) | |
666 | goto Exit; | |
0709db60 | 667 | |
23976728 | 668 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
669 | sys_sync(); |
670 | printk("done.\n"); | |
671 | ||
03afed8b | 672 | error = freeze_processes(); |
5a72e04d | 673 | if (error) |
8fd37a4c RW |
674 | goto Exit; |
675 | ||
942f4015 | 676 | lock_device_hotplug(); |
8fd37a4c RW |
677 | /* Allocate memory management structures */ |
678 | error = create_basic_memory_bitmaps(); | |
679 | if (error) | |
680 | goto Thaw; | |
1da177e4 | 681 | |
7777fab9 | 682 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 683 | if (error || freezer_test_done) |
8fd37a4c | 684 | goto Free_bitmaps; |
64a473cb RW |
685 | |
686 | if (in_suspend) { | |
a634cc10 RW |
687 | unsigned int flags = 0; |
688 | ||
689 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
690 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
691 | if (nocompress) |
692 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
693 | else |
694 | flags |= SF_CRC32_MODE; | |
695 | ||
1da177e4 | 696 | pr_debug("PM: writing image.\n"); |
a634cc10 | 697 | error = swsusp_write(flags); |
7777fab9 | 698 | swsusp_free(); |
1da177e4 | 699 | if (!error) |
fe0c935a | 700 | power_down(); |
5262a475 | 701 | in_suspend = 0; |
c9e664f1 | 702 | pm_restore_gfp_mask(); |
b918f6e6 | 703 | } else { |
1da177e4 | 704 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 705 | } |
64a473cb | 706 | |
8fd37a4c RW |
707 | Free_bitmaps: |
708 | free_basic_memory_bitmaps(); | |
b918f6e6 | 709 | Thaw: |
942f4015 | 710 | unlock_device_hotplug(); |
5a0a2f30 | 711 | thaw_processes(); |
a556d5b5 SB |
712 | |
713 | /* Don't bother checking whether freezer_test_done is true */ | |
714 | freezer_test_done = false; | |
0709db60 | 715 | Exit: |
b10d9117 | 716 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 717 | pm_restore_console(); |
0709db60 | 718 | atomic_inc(&snapshot_device_available); |
b10d9117 | 719 | Unlock: |
bcda53fa | 720 | unlock_system_sleep(); |
1da177e4 LT |
721 | return error; |
722 | } | |
723 | ||
724 | ||
725 | /** | |
f42a9813 RW |
726 | * software_resume - Resume from a saved hibernation image. |
727 | * | |
728 | * This routine is called as a late initcall, when all devices have been | |
729 | * discovered and initialized already. | |
1da177e4 | 730 | * |
f42a9813 RW |
731 | * The image reading code is called to see if there is a hibernation image |
732 | * available for reading. If that is the case, devices are quiesced and the | |
733 | * contents of memory is restored from the saved image. | |
1da177e4 | 734 | * |
f42a9813 | 735 | * If this is successful, control reappears in the restored target kernel in |
d439e64f | 736 | * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine |
f42a9813 RW |
737 | * attempts to recover gracefully and make the kernel return to the normal mode |
738 | * of operation. | |
1da177e4 | 739 | */ |
1da177e4 LT |
740 | static int software_resume(void) |
741 | { | |
742 | int error; | |
a634cc10 | 743 | unsigned int flags; |
1da177e4 | 744 | |
eed3ee08 AV |
745 | /* |
746 | * If the user said "noresume".. bail out early. | |
747 | */ | |
a6e15a39 | 748 | if (noresume || !hibernation_available()) |
eed3ee08 AV |
749 | return 0; |
750 | ||
60a0d233 JB |
751 | /* |
752 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
753 | * is configured into the kernel. Since the regular hibernate | |
754 | * trigger path is via sysfs which takes a buffer mutex before | |
755 | * calling hibernate functions (which take pm_mutex) this can | |
756 | * cause lockdep to complain about a possible ABBA deadlock | |
757 | * which cannot happen since we're in the boot code here and | |
758 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
759 | * here to avoid lockdep complaining. | |
760 | */ | |
761 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
762 | |
763 | if (swsusp_resume_device) | |
764 | goto Check_image; | |
765 | ||
766 | if (!strlen(resume_file)) { | |
767 | error = -ENOENT; | |
768 | goto Unlock; | |
769 | } | |
770 | ||
d0941ead | 771 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 772 | |
f126f733 BS |
773 | if (resume_delay) { |
774 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
775 | resume_delay); | |
776 | ssleep(resume_delay); | |
777 | } | |
778 | ||
0c8454f5 RW |
779 | /* Check if the device is there */ |
780 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
781 | |
782 | /* | |
783 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
784 | * integer format. (e.g. major:minor) | |
785 | */ | |
786 | if (isdigit(resume_file[0]) && resume_wait) { | |
787 | int partno; | |
788 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
789 | msleep(10); | |
790 | } | |
791 | ||
3efa147a | 792 | if (!swsusp_resume_device) { |
eed3ee08 AV |
793 | /* |
794 | * Some device discovery might still be in progress; we need | |
795 | * to wait for this to finish. | |
796 | */ | |
797 | wait_for_device_probe(); | |
6f8d7022 BS |
798 | |
799 | if (resume_wait) { | |
800 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
801 | msleep(10); | |
802 | async_synchronize_full(); | |
803 | } | |
804 | ||
3efa147a | 805 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
806 | if (!swsusp_resume_device) { |
807 | error = -ENODEV; | |
808 | goto Unlock; | |
809 | } | |
3efa147a PM |
810 | } |
811 | ||
0c8454f5 | 812 | Check_image: |
d0941ead | 813 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 814 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 815 | |
d0941ead | 816 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
817 | error = swsusp_check(); |
818 | if (error) | |
74dfd666 | 819 | goto Unlock; |
1da177e4 | 820 | |
0709db60 RW |
821 | /* The snapshot device should not be opened while we're running */ |
822 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
823 | error = -EBUSY; | |
76b57e61 | 824 | swsusp_close(FMODE_READ); |
0709db60 RW |
825 | goto Unlock; |
826 | } | |
827 | ||
5a0a2f30 | 828 | pm_prepare_console(); |
c3e94d89 AS |
829 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
830 | if (error) | |
8fd37a4c | 831 | goto Close_Finish; |
1bfcf130 | 832 | |
74dfd666 | 833 | pr_debug("PM: Preparing processes for restore.\n"); |
03afed8b | 834 | error = freeze_processes(); |
8fd37a4c RW |
835 | if (error) |
836 | goto Close_Finish; | |
1da177e4 | 837 | |
d0941ead | 838 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 839 | |
942f4015 | 840 | lock_device_hotplug(); |
8fd37a4c RW |
841 | error = create_basic_memory_bitmaps(); |
842 | if (error) | |
843 | goto Thaw; | |
844 | ||
a634cc10 | 845 | error = swsusp_read(&flags); |
76b57e61 | 846 | swsusp_close(FMODE_READ); |
ed746e3b | 847 | if (!error) |
a634cc10 | 848 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 849 | |
d0941ead | 850 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 851 | swsusp_free(); |
7b5179ac | 852 | free_basic_memory_bitmaps(); |
8fd37a4c | 853 | Thaw: |
942f4015 | 854 | unlock_device_hotplug(); |
8fd37a4c | 855 | thaw_processes(); |
0709db60 | 856 | Finish: |
c3e94d89 | 857 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 858 | pm_restore_console(); |
0709db60 | 859 | atomic_inc(&snapshot_device_available); |
dd5d666b | 860 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 861 | Unlock: |
a6d70980 | 862 | mutex_unlock(&pm_mutex); |
d0941ead | 863 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 864 | return error; |
8fd37a4c | 865 | Close_Finish: |
76b57e61 JS |
866 | swsusp_close(FMODE_READ); |
867 | goto Finish; | |
1da177e4 LT |
868 | } |
869 | ||
d3c345db | 870 | late_initcall_sync(software_resume); |
1da177e4 LT |
871 | |
872 | ||
a3d25c27 RW |
873 | static const char * const hibernation_modes[] = { |
874 | [HIBERNATION_PLATFORM] = "platform", | |
875 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
876 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
877 | #ifdef CONFIG_SUSPEND |
878 | [HIBERNATION_SUSPEND] = "suspend", | |
879 | #endif | |
1da177e4 LT |
880 | }; |
881 | ||
f42a9813 RW |
882 | /* |
883 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 884 | * |
f42a9813 RW |
885 | * Hibernation can be handled in several ways. There are a few different ways |
886 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
887 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 888 | * mostly). |
1da177e4 | 889 | * |
f42a9813 RW |
890 | * The sysfs file /sys/power/disk provides an interface for selecting the |
891 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 892 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 893 | * |
1da177e4 LT |
894 | * 'platform' |
895 | * 'shutdown' | |
896 | * 'reboot' | |
897 | * | |
f42a9813 RW |
898 | * If a platform hibernation driver is in use, 'platform' will be supported |
899 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
900 | * The selected option (i.e. the one corresponding to the current value of | |
901 | * hibernation_mode) is enclosed by a square bracket. | |
902 | * | |
903 | * To select a given hibernation mode it is necessary to write the mode's | |
904 | * string representation (as returned by reading from /sys/power/disk) back | |
905 | * into /sys/power/disk. | |
1da177e4 LT |
906 | */ |
907 | ||
386f275f KS |
908 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
909 | char *buf) | |
1da177e4 | 910 | { |
f0ced9b2 JB |
911 | int i; |
912 | char *start = buf; | |
913 | ||
a6e15a39 KC |
914 | if (!hibernation_available()) |
915 | return sprintf(buf, "[disabled]\n"); | |
916 | ||
a3d25c27 RW |
917 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
918 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
919 | continue; |
920 | switch (i) { | |
a3d25c27 RW |
921 | case HIBERNATION_SHUTDOWN: |
922 | case HIBERNATION_REBOOT: | |
62c552cc BS |
923 | #ifdef CONFIG_SUSPEND |
924 | case HIBERNATION_SUSPEND: | |
925 | #endif | |
f0ced9b2 | 926 | break; |
a3d25c27 RW |
927 | case HIBERNATION_PLATFORM: |
928 | if (hibernation_ops) | |
f0ced9b2 JB |
929 | break; |
930 | /* not a valid mode, continue with loop */ | |
931 | continue; | |
932 | } | |
a3d25c27 RW |
933 | if (i == hibernation_mode) |
934 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 935 | else |
a3d25c27 | 936 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
937 | } |
938 | buf += sprintf(buf, "\n"); | |
939 | return buf-start; | |
1da177e4 LT |
940 | } |
941 | ||
386f275f KS |
942 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
943 | const char *buf, size_t n) | |
1da177e4 LT |
944 | { |
945 | int error = 0; | |
946 | int i; | |
947 | int len; | |
948 | char *p; | |
a3d25c27 | 949 | int mode = HIBERNATION_INVALID; |
1da177e4 | 950 | |
a6e15a39 KC |
951 | if (!hibernation_available()) |
952 | return -EPERM; | |
953 | ||
1da177e4 LT |
954 | p = memchr(buf, '\n', n); |
955 | len = p ? p - buf : n; | |
956 | ||
bcda53fa | 957 | lock_system_sleep(); |
a3d25c27 | 958 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
959 | if (len == strlen(hibernation_modes[i]) |
960 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
961 | mode = i; |
962 | break; | |
963 | } | |
964 | } | |
a3d25c27 | 965 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 966 | switch (mode) { |
a3d25c27 RW |
967 | case HIBERNATION_SHUTDOWN: |
968 | case HIBERNATION_REBOOT: | |
62c552cc BS |
969 | #ifdef CONFIG_SUSPEND |
970 | case HIBERNATION_SUSPEND: | |
971 | #endif | |
a3d25c27 | 972 | hibernation_mode = mode; |
fe0c935a | 973 | break; |
a3d25c27 RW |
974 | case HIBERNATION_PLATFORM: |
975 | if (hibernation_ops) | |
976 | hibernation_mode = mode; | |
1da177e4 LT |
977 | else |
978 | error = -EINVAL; | |
979 | } | |
a3d25c27 | 980 | } else |
1da177e4 LT |
981 | error = -EINVAL; |
982 | ||
a3d25c27 | 983 | if (!error) |
23976728 | 984 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 985 | hibernation_modes[mode]); |
bcda53fa | 986 | unlock_system_sleep(); |
1da177e4 LT |
987 | return error ? error : n; |
988 | } | |
989 | ||
990 | power_attr(disk); | |
991 | ||
386f275f KS |
992 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
993 | char *buf) | |
1da177e4 LT |
994 | { |
995 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
996 | MINOR(swsusp_resume_device)); | |
997 | } | |
998 | ||
386f275f KS |
999 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
1000 | const char *buf, size_t n) | |
1da177e4 | 1001 | { |
1da177e4 | 1002 | dev_t res; |
421a5fa1 SC |
1003 | int len = n; |
1004 | char *name; | |
1da177e4 | 1005 | |
421a5fa1 SC |
1006 | if (len && buf[len-1] == '\n') |
1007 | len--; | |
1008 | name = kstrndup(buf, len, GFP_KERNEL); | |
1009 | if (!name) | |
1010 | return -ENOMEM; | |
1da177e4 | 1011 | |
421a5fa1 SC |
1012 | res = name_to_dev_t(name); |
1013 | kfree(name); | |
1014 | if (!res) | |
1015 | return -EINVAL; | |
1da177e4 | 1016 | |
bcda53fa | 1017 | lock_system_sleep(); |
a576219a | 1018 | swsusp_resume_device = res; |
bcda53fa | 1019 | unlock_system_sleep(); |
23976728 | 1020 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
1021 | noresume = 0; |
1022 | software_resume(); | |
421a5fa1 | 1023 | return n; |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | power_attr(resume); | |
1027 | ||
386f275f KS |
1028 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1029 | char *buf) | |
ca0aec0f | 1030 | { |
853609b6 | 1031 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1032 | } |
1033 | ||
386f275f KS |
1034 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1035 | const char *buf, size_t n) | |
ca0aec0f | 1036 | { |
853609b6 | 1037 | unsigned long size; |
ca0aec0f | 1038 | |
853609b6 | 1039 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1040 | image_size = size; |
1041 | return n; | |
1042 | } | |
1043 | ||
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1047 | power_attr(image_size); | |
1048 | ||
ddeb6487 RW |
1049 | static ssize_t reserved_size_show(struct kobject *kobj, |
1050 | struct kobj_attribute *attr, char *buf) | |
1051 | { | |
1052 | return sprintf(buf, "%lu\n", reserved_size); | |
1053 | } | |
1054 | ||
1055 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1056 | struct kobj_attribute *attr, | |
1057 | const char *buf, size_t n) | |
1058 | { | |
1059 | unsigned long size; | |
1060 | ||
1061 | if (sscanf(buf, "%lu", &size) == 1) { | |
1062 | reserved_size = size; | |
1063 | return n; | |
1064 | } | |
1065 | ||
1066 | return -EINVAL; | |
1067 | } | |
1068 | ||
1069 | power_attr(reserved_size); | |
1070 | ||
1da177e4 LT |
1071 | static struct attribute * g[] = { |
1072 | &disk_attr.attr, | |
1073 | &resume_attr.attr, | |
ca0aec0f | 1074 | &image_size_attr.attr, |
ddeb6487 | 1075 | &reserved_size_attr.attr, |
1da177e4 LT |
1076 | NULL, |
1077 | }; | |
1078 | ||
1079 | ||
1080 | static struct attribute_group attr_group = { | |
1081 | .attrs = g, | |
1082 | }; | |
1083 | ||
1084 | ||
1085 | static int __init pm_disk_init(void) | |
1086 | { | |
d76e15fb | 1087 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1088 | } |
1089 | ||
1090 | core_initcall(pm_disk_init); | |
1091 | ||
1092 | ||
1093 | static int __init resume_setup(char *str) | |
1094 | { | |
1095 | if (noresume) | |
1096 | return 1; | |
1097 | ||
1098 | strncpy( resume_file, str, 255 ); | |
1099 | return 1; | |
1100 | } | |
1101 | ||
9a154d9d RW |
1102 | static int __init resume_offset_setup(char *str) |
1103 | { | |
1104 | unsigned long long offset; | |
1105 | ||
1106 | if (noresume) | |
1107 | return 1; | |
1108 | ||
1109 | if (sscanf(str, "%llu", &offset) == 1) | |
1110 | swsusp_resume_block = offset; | |
1111 | ||
1112 | return 1; | |
1113 | } | |
1114 | ||
f996fc96 BS |
1115 | static int __init hibernate_setup(char *str) |
1116 | { | |
1117 | if (!strncmp(str, "noresume", 8)) | |
1118 | noresume = 1; | |
1119 | else if (!strncmp(str, "nocompress", 10)) | |
1120 | nocompress = 1; | |
a6e15a39 KC |
1121 | else if (!strncmp(str, "no", 2)) { |
1122 | noresume = 1; | |
1123 | nohibernate = 1; | |
1124 | } | |
f996fc96 BS |
1125 | return 1; |
1126 | } | |
1127 | ||
1da177e4 LT |
1128 | static int __init noresume_setup(char *str) |
1129 | { | |
1130 | noresume = 1; | |
1131 | return 1; | |
1132 | } | |
1133 | ||
6f8d7022 BS |
1134 | static int __init resumewait_setup(char *str) |
1135 | { | |
1136 | resume_wait = 1; | |
1137 | return 1; | |
1138 | } | |
1139 | ||
f126f733 BS |
1140 | static int __init resumedelay_setup(char *str) |
1141 | { | |
f6514be5 | 1142 | int rc = kstrtouint(str, 0, &resume_delay); |
317cf7e5 FF |
1143 | |
1144 | if (rc) | |
1145 | return rc; | |
f126f733 BS |
1146 | return 1; |
1147 | } | |
1148 | ||
a6e15a39 KC |
1149 | static int __init nohibernate_setup(char *str) |
1150 | { | |
1151 | noresume = 1; | |
1152 | nohibernate = 1; | |
1153 | return 1; | |
1154 | } | |
1155 | ||
24f2e027 KC |
1156 | static int __init kaslr_nohibernate_setup(char *str) |
1157 | { | |
1158 | return nohibernate_setup(str); | |
1159 | } | |
1160 | ||
1da177e4 | 1161 | __setup("noresume", noresume_setup); |
9a154d9d | 1162 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1163 | __setup("resume=", resume_setup); |
f996fc96 | 1164 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1165 | __setup("resumewait", resumewait_setup); |
f126f733 | 1166 | __setup("resumedelay=", resumedelay_setup); |
a6e15a39 | 1167 | __setup("nohibernate", nohibernate_setup); |
24f2e027 | 1168 | __setup("kaslr", kaslr_nohibernate_setup); |