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 | |
fe12c00d | 55 | HIBERNATION_TEST_RESUME, |
a3d25c27 RW |
56 | /* keep last */ |
57 | __HIBERNATION_AFTER_LAST | |
58 | }; | |
59 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
60 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
61 | ||
62 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
63 | ||
97819a26 | 64 | bool freezer_test_done; |
aa9a7b11 | 65 | |
073ef1f6 | 66 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 | 67 | |
a6e15a39 KC |
68 | bool hibernation_available(void) |
69 | { | |
70 | return (nohibernate == 0); | |
71 | } | |
72 | ||
a3d25c27 | 73 | /** |
f42a9813 RW |
74 | * hibernation_set_ops - Set the global hibernate operations. |
75 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 76 | */ |
073ef1f6 | 77 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 78 | { |
caea99ef RW |
79 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
80 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 81 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
82 | WARN_ON(1); |
83 | return; | |
84 | } | |
bcda53fa | 85 | lock_system_sleep(); |
a3d25c27 RW |
86 | hibernation_ops = ops; |
87 | if (ops) | |
88 | hibernation_mode = HIBERNATION_PLATFORM; | |
89 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
90 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
91 | ||
bcda53fa | 92 | unlock_system_sleep(); |
a3d25c27 | 93 | } |
e0c7855e | 94 | EXPORT_SYMBOL_GPL(hibernation_set_ops); |
a3d25c27 | 95 | |
abfe2d7b RW |
96 | static bool entering_platform_hibernation; |
97 | ||
98 | bool system_entering_hibernation(void) | |
99 | { | |
100 | return entering_platform_hibernation; | |
101 | } | |
102 | EXPORT_SYMBOL(system_entering_hibernation); | |
103 | ||
4cc79776 RW |
104 | #ifdef CONFIG_PM_DEBUG |
105 | static void hibernation_debug_sleep(void) | |
106 | { | |
107 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
108 | mdelay(5000); | |
109 | } | |
110 | ||
4cc79776 RW |
111 | static int hibernation_test(int level) |
112 | { | |
113 | if (pm_test_level == level) { | |
114 | hibernation_debug_sleep(); | |
115 | return 1; | |
116 | } | |
117 | return 0; | |
118 | } | |
119 | #else /* !CONFIG_PM_DEBUG */ | |
4cc79776 RW |
120 | static int hibernation_test(int level) { return 0; } |
121 | #endif /* !CONFIG_PM_DEBUG */ | |
122 | ||
74f270af | 123 | /** |
f42a9813 RW |
124 | * platform_begin - Call platform to start hibernation. |
125 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 126 | */ |
caea99ef | 127 | static int platform_begin(int platform_mode) |
74f270af RW |
128 | { |
129 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
130 | hibernation_ops->begin() : 0; |
131 | } | |
132 | ||
133 | /** | |
f42a9813 RW |
134 | * platform_end - Call platform to finish transition to the working state. |
135 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 136 | */ |
caea99ef RW |
137 | static void platform_end(int platform_mode) |
138 | { | |
139 | if (platform_mode && hibernation_ops) | |
140 | hibernation_ops->end(); | |
74f270af | 141 | } |
a3d25c27 | 142 | |
8a05aac2 | 143 | /** |
f42a9813 RW |
144 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
145 | * @platform_mode: Whether or not to use the platform driver. | |
146 | * | |
147 | * Use the platform driver to prepare the system for creating a hibernate image, | |
148 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
149 | */ |
150 | ||
74f270af | 151 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 152 | { |
7777fab9 | 153 | return (platform_mode && hibernation_ops) ? |
74f270af | 154 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 155 | } |
8a05aac2 | 156 | |
c7e0831d | 157 | /** |
f42a9813 RW |
158 | * platform_leave - Call platform to prepare a transition to the working state. |
159 | * @platform_mode: Whether or not to use the platform driver. | |
160 | * | |
161 | * Use the platform driver prepare to prepare the machine for switching to the | |
162 | * normal mode of operation. | |
163 | * | |
164 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 165 | */ |
c7e0831d RW |
166 | static void platform_leave(int platform_mode) |
167 | { | |
168 | if (platform_mode && hibernation_ops) | |
169 | hibernation_ops->leave(); | |
170 | } | |
171 | ||
a3d25c27 | 172 | /** |
f42a9813 RW |
173 | * platform_finish - Call platform to switch the system to the working state. |
174 | * @platform_mode: Whether or not to use the platform driver. | |
175 | * | |
176 | * Use the platform driver to switch the machine to the normal mode of | |
177 | * operation. | |
178 | * | |
179 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 180 | */ |
7777fab9 | 181 | static void platform_finish(int platform_mode) |
a3d25c27 | 182 | { |
7777fab9 | 183 | if (platform_mode && hibernation_ops) |
a3d25c27 | 184 | hibernation_ops->finish(); |
8a05aac2 SS |
185 | } |
186 | ||
a634cc10 | 187 | /** |
f42a9813 RW |
188 | * platform_pre_restore - Prepare for hibernate image restoration. |
189 | * @platform_mode: Whether or not to use the platform driver. | |
190 | * | |
191 | * Use the platform driver to prepare the system for resume from a hibernation | |
192 | * image. | |
193 | * | |
194 | * If the restore fails after this function has been called, | |
195 | * platform_restore_cleanup() must be called. | |
a634cc10 | 196 | */ |
a634cc10 RW |
197 | static int platform_pre_restore(int platform_mode) |
198 | { | |
199 | return (platform_mode && hibernation_ops) ? | |
200 | hibernation_ops->pre_restore() : 0; | |
201 | } | |
202 | ||
203 | /** | |
f42a9813 RW |
204 | * platform_restore_cleanup - Switch to the working state after failing restore. |
205 | * @platform_mode: Whether or not to use the platform driver. | |
206 | * | |
207 | * Use the platform driver to switch the system to the normal mode of operation | |
208 | * after a failing restore. | |
209 | * | |
210 | * If platform_pre_restore() has been called before the failing restore, this | |
211 | * function must be called too, regardless of the result of | |
212 | * platform_pre_restore(). | |
a634cc10 | 213 | */ |
a634cc10 RW |
214 | static void platform_restore_cleanup(int platform_mode) |
215 | { | |
216 | if (platform_mode && hibernation_ops) | |
217 | hibernation_ops->restore_cleanup(); | |
218 | } | |
219 | ||
d8f3de0d | 220 | /** |
f42a9813 RW |
221 | * platform_recover - Recover from a failure to suspend devices. |
222 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 223 | */ |
d8f3de0d RW |
224 | static void platform_recover(int platform_mode) |
225 | { | |
226 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
227 | hibernation_ops->recover(); | |
228 | } | |
229 | ||
8e60c6a1 | 230 | /** |
f42a9813 RW |
231 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
232 | * @start: Starting event. | |
233 | * @stop: Final event. | |
234 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
235 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 236 | */ |
db597605 TR |
237 | void swsusp_show_speed(ktime_t start, ktime_t stop, |
238 | unsigned nr_pages, char *msg) | |
8e60c6a1 | 239 | { |
db597605 | 240 | ktime_t diff; |
4881f603 CG |
241 | u64 elapsed_centisecs64; |
242 | unsigned int centisecs; | |
243 | unsigned int k; | |
244 | unsigned int kps; | |
8e60c6a1 | 245 | |
db597605 TR |
246 | diff = ktime_sub(stop, start); |
247 | elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC); | |
8e60c6a1 NC |
248 | centisecs = elapsed_centisecs64; |
249 | if (centisecs == 0) | |
250 | centisecs = 1; /* avoid div-by-zero */ | |
251 | k = nr_pages * (PAGE_SIZE / 1024); | |
252 | kps = (k * 100) / centisecs; | |
4881f603 | 253 | printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n", |
8e60c6a1 NC |
254 | msg, k, |
255 | centisecs / 100, centisecs % 100, | |
256 | kps / 1000, (kps % 1000) / 10); | |
257 | } | |
258 | ||
c7e0831d | 259 | /** |
f42a9813 RW |
260 | * create_image - Create a hibernation image. |
261 | * @platform_mode: Whether or not to use the platform driver. | |
262 | * | |
cf579dfb RW |
263 | * Execute device drivers' "late" and "noirq" freeze callbacks, create a |
264 | * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. | |
f42a9813 RW |
265 | * |
266 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 267 | */ |
47a460d5 | 268 | static int create_image(int platform_mode) |
c7e0831d RW |
269 | { |
270 | int error; | |
271 | ||
cf579dfb | 272 | error = dpm_suspend_end(PMSG_FREEZE); |
c7e0831d | 273 | if (error) { |
23976728 RW |
274 | printk(KERN_ERR "PM: Some devices failed to power down, " |
275 | "aborting hibernation\n"); | |
32bdfac5 | 276 | return error; |
c7e0831d | 277 | } |
2ed8d2b3 | 278 | |
4aecd671 RW |
279 | error = platform_pre_snapshot(platform_mode); |
280 | if (error || hibernation_test(TEST_PLATFORM)) | |
281 | goto Platform_finish; | |
282 | ||
283 | error = disable_nonboot_cpus(); | |
48580ab8 | 284 | if (error || hibernation_test(TEST_CPUS)) |
4aecd671 RW |
285 | goto Enable_cpus; |
286 | ||
2ed8d2b3 RW |
287 | local_irq_disable(); |
288 | ||
2e711c04 | 289 | error = syscore_suspend(); |
770824bd | 290 | if (error) { |
4484079d | 291 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 292 | "aborting hibernation\n"); |
4aecd671 | 293 | goto Enable_irqs; |
770824bd | 294 | } |
c7e0831d | 295 | |
a2867e08 | 296 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
297 | goto Power_up; |
298 | ||
299 | in_suspend = 1; | |
c7e0831d | 300 | save_processor_state(); |
bb3632c6 | 301 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true); |
c7e0831d | 302 | error = swsusp_arch_suspend(); |
bb3632c6 | 303 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false); |
c7e0831d | 304 | if (error) |
23976728 RW |
305 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
306 | error); | |
c7e0831d RW |
307 | /* Restore control flow magically appears here */ |
308 | restore_processor_state(); | |
362e77d1 | 309 | if (!in_suspend) |
c125e96f | 310 | events_check_enabled = false; |
362e77d1 BM |
311 | |
312 | platform_leave(platform_mode); | |
4aecd671 | 313 | |
4cc79776 | 314 | Power_up: |
40dc166c | 315 | syscore_resume(); |
2ed8d2b3 | 316 | |
4aecd671 | 317 | Enable_irqs: |
2ed8d2b3 RW |
318 | local_irq_enable(); |
319 | ||
4aecd671 RW |
320 | Enable_cpus: |
321 | enable_nonboot_cpus(); | |
322 | ||
323 | Platform_finish: | |
324 | platform_finish(platform_mode); | |
325 | ||
cf579dfb | 326 | dpm_resume_start(in_suspend ? |
1eede070 | 327 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 328 | |
c7e0831d RW |
329 | return error; |
330 | } | |
331 | ||
7777fab9 | 332 | /** |
f42a9813 RW |
333 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
334 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 335 | * |
f42a9813 | 336 | * This routine must be called with pm_mutex held. |
7777fab9 | 337 | */ |
7777fab9 RW |
338 | int hibernation_snapshot(int platform_mode) |
339 | { | |
953a2063 | 340 | pm_message_t msg; |
cbe2f5a6 | 341 | int error; |
7777fab9 | 342 | |
27614273 | 343 | pm_suspend_clear_flags(); |
3fe0313e | 344 | error = platform_begin(platform_mode); |
7777fab9 | 345 | if (error) |
d074ee02 | 346 | goto Close; |
7777fab9 | 347 | |
64a473cb RW |
348 | /* Preallocate image memory before shutting down devices. */ |
349 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
350 | if (error) |
351 | goto Close; | |
352 | ||
353 | error = freeze_kernel_threads(); | |
354 | if (error) | |
bb58dd5d | 355 | goto Cleanup; |
2aede851 | 356 | |
48580ab8 | 357 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
358 | |
359 | /* | |
360 | * Indicate to the caller that we are returning due to a | |
361 | * successful freezer test. | |
362 | */ | |
363 | freezer_test_done = true; | |
51d6ff7a | 364 | goto Thaw; |
aa9a7b11 SB |
365 | } |
366 | ||
2aede851 | 367 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 368 | if (error) { |
953a2063 | 369 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 370 | goto Thaw; |
bb58dd5d | 371 | } |
74f270af | 372 | |
7777fab9 | 373 | suspend_console(); |
c9e664f1 | 374 | pm_restrict_gfp_mask(); |
953a2063 | 375 | |
91e7c75b | 376 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 377 | |
953a2063 SB |
378 | if (error || hibernation_test(TEST_DEVICES)) |
379 | platform_recover(platform_mode); | |
380 | else | |
381 | error = create_image(platform_mode); | |
7777fab9 | 382 | |
c9e664f1 | 383 | /* |
953a2063 SB |
384 | * In the case that we call create_image() above, the control |
385 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
386 | * image creation has failed and (2) after a successful restore. |
387 | */ | |
4cc79776 | 388 | |
64a473cb RW |
389 | /* We may need to release the preallocated image pages here. */ |
390 | if (error || !in_suspend) | |
391 | swsusp_free(); | |
392 | ||
91e7c75b RW |
393 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
394 | dpm_resume(msg); | |
c9e664f1 RW |
395 | |
396 | if (error || !in_suspend) | |
397 | pm_restore_gfp_mask(); | |
398 | ||
7777fab9 | 399 | resume_console(); |
91e7c75b RW |
400 | dpm_complete(msg); |
401 | ||
caea99ef RW |
402 | Close: |
403 | platform_end(platform_mode); | |
7777fab9 | 404 | return error; |
d8f3de0d | 405 | |
51d6ff7a SB |
406 | Thaw: |
407 | thaw_kernel_threads(); | |
bb58dd5d RW |
408 | Cleanup: |
409 | swsusp_free(); | |
410 | goto Close; | |
7777fab9 RW |
411 | } |
412 | ||
406f992e RW |
413 | int __weak hibernate_resume_nonboot_cpu_disable(void) |
414 | { | |
415 | return disable_nonboot_cpus(); | |
416 | } | |
417 | ||
72df68ca | 418 | /** |
f42a9813 RW |
419 | * resume_target_kernel - Restore system state from a hibernation image. |
420 | * @platform_mode: Whether or not to use the platform driver. | |
421 | * | |
cf579dfb RW |
422 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
423 | * contents of highmem that have not been restored yet from the image and run | |
424 | * the low-level code that will restore the remaining contents of memory and | |
425 | * switch to the just restored target kernel. | |
72df68ca | 426 | */ |
4aecd671 | 427 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
428 | { |
429 | int error; | |
430 | ||
cf579dfb | 431 | error = dpm_suspend_end(PMSG_QUIESCE); |
72df68ca | 432 | if (error) { |
23976728 | 433 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 434 | "aborting resume\n"); |
32bdfac5 | 435 | return error; |
72df68ca | 436 | } |
2ed8d2b3 | 437 | |
4aecd671 RW |
438 | error = platform_pre_restore(platform_mode); |
439 | if (error) | |
440 | goto Cleanup; | |
441 | ||
406f992e | 442 | error = hibernate_resume_nonboot_cpu_disable(); |
4aecd671 RW |
443 | if (error) |
444 | goto Enable_cpus; | |
445 | ||
2ed8d2b3 RW |
446 | local_irq_disable(); |
447 | ||
2e711c04 | 448 | error = syscore_suspend(); |
4aecd671 RW |
449 | if (error) |
450 | goto Enable_irqs; | |
451 | ||
72df68ca RW |
452 | save_processor_state(); |
453 | error = restore_highmem(); | |
454 | if (!error) { | |
455 | error = swsusp_arch_resume(); | |
456 | /* | |
457 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
458 | * Otherwise, execution continues at the place where |
459 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
460 | */ |
461 | BUG_ON(!error); | |
4e2d9491 RW |
462 | /* |
463 | * This call to restore_highmem() reverts the changes made by | |
464 | * the previous one. | |
465 | */ | |
72df68ca RW |
466 | restore_highmem(); |
467 | } | |
468 | /* | |
469 | * The only reason why swsusp_arch_resume() can fail is memory being | |
470 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 471 | * subsequent failures. |
72df68ca RW |
472 | */ |
473 | swsusp_free(); | |
474 | restore_processor_state(); | |
475 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 476 | |
40dc166c | 477 | syscore_resume(); |
2ed8d2b3 | 478 | |
4aecd671 | 479 | Enable_irqs: |
72df68ca | 480 | local_irq_enable(); |
2ed8d2b3 | 481 | |
4aecd671 RW |
482 | Enable_cpus: |
483 | enable_nonboot_cpus(); | |
484 | ||
485 | Cleanup: | |
486 | platform_restore_cleanup(platform_mode); | |
487 | ||
cf579dfb | 488 | dpm_resume_start(PMSG_RECOVER); |
2ed8d2b3 | 489 | |
72df68ca RW |
490 | return error; |
491 | } | |
492 | ||
7777fab9 | 493 | /** |
f42a9813 RW |
494 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
495 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 496 | * |
f42a9813 | 497 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 498 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 499 | */ |
a634cc10 | 500 | int hibernation_restore(int platform_mode) |
7777fab9 | 501 | { |
cbe2f5a6 | 502 | int error; |
7777fab9 RW |
503 | |
504 | pm_prepare_console(); | |
505 | suspend_console(); | |
c9e664f1 | 506 | pm_restrict_gfp_mask(); |
d1616302 | 507 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 508 | if (!error) { |
4aecd671 | 509 | error = resume_target_kernel(platform_mode); |
94fb823f ID |
510 | /* |
511 | * The above should either succeed and jump to the new kernel, | |
512 | * or return with an error. Otherwise things are just | |
513 | * undefined, so let's be paranoid. | |
514 | */ | |
515 | BUG_ON(!error); | |
a634cc10 | 516 | } |
94fb823f | 517 | dpm_resume_end(PMSG_RECOVER); |
c9e664f1 | 518 | pm_restore_gfp_mask(); |
7777fab9 RW |
519 | resume_console(); |
520 | pm_restore_console(); | |
521 | return error; | |
522 | } | |
523 | ||
524 | /** | |
f42a9813 | 525 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 526 | */ |
7777fab9 RW |
527 | int hibernation_platform_enter(void) |
528 | { | |
cbe2f5a6 | 529 | int error; |
b1457bcc | 530 | |
9cd9a005 RW |
531 | if (!hibernation_ops) |
532 | return -ENOSYS; | |
533 | ||
534 | /* | |
535 | * We have cancelled the power transition by running | |
536 | * hibernation_ops->finish() before saving the image, so we should let | |
537 | * the firmware know that we're going to enter the sleep state after all | |
538 | */ | |
caea99ef | 539 | error = hibernation_ops->begin(); |
9cd9a005 | 540 | if (error) |
caea99ef | 541 | goto Close; |
9cd9a005 | 542 | |
abfe2d7b | 543 | entering_platform_hibernation = true; |
9cd9a005 | 544 | suspend_console(); |
d1616302 | 545 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
546 | if (error) { |
547 | if (hibernation_ops->recover) | |
548 | hibernation_ops->recover(); | |
549 | goto Resume_devices; | |
550 | } | |
9cd9a005 | 551 | |
cf579dfb | 552 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 553 | if (error) |
32bdfac5 | 554 | goto Resume_devices; |
4aecd671 | 555 | |
9cd9a005 RW |
556 | error = hibernation_ops->prepare(); |
557 | if (error) | |
e681c9dd | 558 | goto Platform_finish; |
9cd9a005 RW |
559 | |
560 | error = disable_nonboot_cpus(); | |
561 | if (error) | |
8c506608 | 562 | goto Enable_cpus; |
2ed8d2b3 | 563 | |
4aecd671 | 564 | local_irq_disable(); |
40dc166c | 565 | syscore_suspend(); |
a2867e08 | 566 | if (pm_wakeup_pending()) { |
c125e96f RW |
567 | error = -EAGAIN; |
568 | goto Power_up; | |
569 | } | |
570 | ||
4aecd671 RW |
571 | hibernation_ops->enter(); |
572 | /* We should never get here */ | |
573 | while (1); | |
9cd9a005 | 574 | |
c125e96f | 575 | Power_up: |
40dc166c | 576 | syscore_resume(); |
c125e96f | 577 | local_irq_enable(); |
8c506608 VK |
578 | |
579 | Enable_cpus: | |
c125e96f RW |
580 | enable_nonboot_cpus(); |
581 | ||
e681c9dd | 582 | Platform_finish: |
9cd9a005 | 583 | hibernation_ops->finish(); |
2ed8d2b3 | 584 | |
cf579dfb | 585 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 586 | |
9cd9a005 | 587 | Resume_devices: |
abfe2d7b | 588 | entering_platform_hibernation = false; |
d1616302 | 589 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 590 | resume_console(); |
2ed8d2b3 | 591 | |
caea99ef RW |
592 | Close: |
593 | hibernation_ops->end(); | |
2ed8d2b3 | 594 | |
b1457bcc | 595 | return error; |
7777fab9 RW |
596 | } |
597 | ||
1da177e4 | 598 | /** |
f42a9813 | 599 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 600 | * |
f42a9813 RW |
601 | * Use the platform driver, if configured, to put the system into the sleep |
602 | * state corresponding to hibernation, or try to power it off or reboot, | |
603 | * depending on the value of hibernation_mode. | |
1da177e4 | 604 | */ |
fe0c935a | 605 | static void power_down(void) |
1da177e4 | 606 | { |
62c552cc BS |
607 | #ifdef CONFIG_SUSPEND |
608 | int error; | |
609 | #endif | |
610 | ||
a3d25c27 | 611 | switch (hibernation_mode) { |
a3d25c27 | 612 | case HIBERNATION_REBOOT: |
fdde86ac | 613 | kernel_restart(NULL); |
1da177e4 | 614 | break; |
a3d25c27 | 615 | case HIBERNATION_PLATFORM: |
7777fab9 | 616 | hibernation_platform_enter(); |
9cd9a005 | 617 | case HIBERNATION_SHUTDOWN: |
2c730785 SC |
618 | if (pm_power_off) |
619 | kernel_power_off(); | |
9cd9a005 | 620 | break; |
62c552cc BS |
621 | #ifdef CONFIG_SUSPEND |
622 | case HIBERNATION_SUSPEND: | |
623 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
624 | if (error) { | |
625 | if (hibernation_ops) | |
626 | hibernation_mode = HIBERNATION_PLATFORM; | |
627 | else | |
628 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
629 | power_down(); | |
630 | } | |
631 | /* | |
632 | * Restore swap signature. | |
633 | */ | |
634 | error = swsusp_unmark(); | |
635 | if (error) | |
636 | printk(KERN_ERR "PM: Swap will be unusable! " | |
637 | "Try swapon -a.\n"); | |
638 | return; | |
639 | #endif | |
1da177e4 | 640 | } |
fdde86ac | 641 | kernel_halt(); |
fe0c935a JB |
642 | /* |
643 | * Valid image is on the disk, if we continue we risk serious data | |
644 | * corruption after resume. | |
645 | */ | |
23976728 | 646 | printk(KERN_CRIT "PM: Please power down manually\n"); |
2c730785 SC |
647 | while (1) |
648 | cpu_relax(); | |
1da177e4 LT |
649 | } |
650 | ||
fe12c00d CY |
651 | static int load_image_and_restore(void) |
652 | { | |
653 | int error; | |
654 | unsigned int flags; | |
655 | ||
656 | pr_debug("PM: Loading hibernation image.\n"); | |
657 | ||
658 | lock_device_hotplug(); | |
659 | error = create_basic_memory_bitmaps(); | |
660 | if (error) | |
661 | goto Unlock; | |
662 | ||
663 | error = swsusp_read(&flags); | |
664 | swsusp_close(FMODE_READ); | |
665 | if (!error) | |
666 | hibernation_restore(flags & SF_PLATFORM_MODE); | |
667 | ||
668 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); | |
669 | swsusp_free(); | |
670 | free_basic_memory_bitmaps(); | |
671 | Unlock: | |
672 | unlock_device_hotplug(); | |
673 | ||
674 | return error; | |
675 | } | |
676 | ||
1da177e4 | 677 | /** |
f42a9813 | 678 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 679 | */ |
a3d25c27 | 680 | int hibernate(void) |
1da177e4 | 681 | { |
ea00f4f4 | 682 | int error, nr_calls = 0; |
fe12c00d | 683 | bool snapshot_test = false; |
1da177e4 | 684 | |
a6e15a39 KC |
685 | if (!hibernation_available()) { |
686 | pr_debug("PM: Hibernation not available.\n"); | |
687 | return -EPERM; | |
688 | } | |
689 | ||
bcda53fa | 690 | lock_system_sleep(); |
0709db60 | 691 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
692 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
693 | error = -EBUSY; | |
694 | goto Unlock; | |
695 | } | |
696 | ||
5a0a2f30 | 697 | pm_prepare_console(); |
ea00f4f4 LW |
698 | error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); |
699 | if (error) { | |
700 | nr_calls--; | |
b10d9117 | 701 | goto Exit; |
ea00f4f4 | 702 | } |
0709db60 | 703 | |
23976728 | 704 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
705 | sys_sync(); |
706 | printk("done.\n"); | |
707 | ||
03afed8b | 708 | error = freeze_processes(); |
5a72e04d | 709 | if (error) |
8fd37a4c RW |
710 | goto Exit; |
711 | ||
942f4015 | 712 | lock_device_hotplug(); |
8fd37a4c RW |
713 | /* Allocate memory management structures */ |
714 | error = create_basic_memory_bitmaps(); | |
715 | if (error) | |
716 | goto Thaw; | |
1da177e4 | 717 | |
7777fab9 | 718 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 719 | if (error || freezer_test_done) |
8fd37a4c | 720 | goto Free_bitmaps; |
64a473cb RW |
721 | |
722 | if (in_suspend) { | |
a634cc10 RW |
723 | unsigned int flags = 0; |
724 | ||
725 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
726 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
727 | if (nocompress) |
728 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
729 | else |
730 | flags |= SF_CRC32_MODE; | |
731 | ||
1da177e4 | 732 | pr_debug("PM: writing image.\n"); |
a634cc10 | 733 | error = swsusp_write(flags); |
7777fab9 | 734 | swsusp_free(); |
fe12c00d CY |
735 | if (!error) { |
736 | if (hibernation_mode == HIBERNATION_TEST_RESUME) | |
737 | snapshot_test = true; | |
738 | else | |
739 | power_down(); | |
740 | } | |
5262a475 | 741 | in_suspend = 0; |
c9e664f1 | 742 | pm_restore_gfp_mask(); |
b918f6e6 | 743 | } else { |
1da177e4 | 744 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 745 | } |
64a473cb | 746 | |
8fd37a4c RW |
747 | Free_bitmaps: |
748 | free_basic_memory_bitmaps(); | |
b918f6e6 | 749 | Thaw: |
942f4015 | 750 | unlock_device_hotplug(); |
fe12c00d CY |
751 | if (snapshot_test) { |
752 | pr_debug("PM: Checking hibernation image\n"); | |
753 | error = swsusp_check(); | |
754 | if (!error) | |
755 | error = load_image_and_restore(); | |
756 | } | |
5a0a2f30 | 757 | thaw_processes(); |
a556d5b5 SB |
758 | |
759 | /* Don't bother checking whether freezer_test_done is true */ | |
760 | freezer_test_done = false; | |
0709db60 | 761 | Exit: |
ea00f4f4 | 762 | __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL); |
5a0a2f30 | 763 | pm_restore_console(); |
0709db60 | 764 | atomic_inc(&snapshot_device_available); |
b10d9117 | 765 | Unlock: |
bcda53fa | 766 | unlock_system_sleep(); |
1da177e4 LT |
767 | return error; |
768 | } | |
769 | ||
770 | ||
771 | /** | |
f42a9813 RW |
772 | * software_resume - Resume from a saved hibernation image. |
773 | * | |
774 | * This routine is called as a late initcall, when all devices have been | |
775 | * discovered and initialized already. | |
1da177e4 | 776 | * |
f42a9813 RW |
777 | * The image reading code is called to see if there is a hibernation image |
778 | * available for reading. If that is the case, devices are quiesced and the | |
779 | * contents of memory is restored from the saved image. | |
1da177e4 | 780 | * |
f42a9813 | 781 | * If this is successful, control reappears in the restored target kernel in |
d439e64f | 782 | * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine |
f42a9813 RW |
783 | * attempts to recover gracefully and make the kernel return to the normal mode |
784 | * of operation. | |
1da177e4 | 785 | */ |
1da177e4 LT |
786 | static int software_resume(void) |
787 | { | |
ea00f4f4 | 788 | int error, nr_calls = 0; |
1da177e4 | 789 | |
eed3ee08 AV |
790 | /* |
791 | * If the user said "noresume".. bail out early. | |
792 | */ | |
a6e15a39 | 793 | if (noresume || !hibernation_available()) |
eed3ee08 AV |
794 | return 0; |
795 | ||
60a0d233 JB |
796 | /* |
797 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
798 | * is configured into the kernel. Since the regular hibernate | |
799 | * trigger path is via sysfs which takes a buffer mutex before | |
800 | * calling hibernate functions (which take pm_mutex) this can | |
801 | * cause lockdep to complain about a possible ABBA deadlock | |
802 | * which cannot happen since we're in the boot code here and | |
803 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
804 | * here to avoid lockdep complaining. | |
805 | */ | |
806 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
807 | |
808 | if (swsusp_resume_device) | |
809 | goto Check_image; | |
810 | ||
811 | if (!strlen(resume_file)) { | |
812 | error = -ENOENT; | |
813 | goto Unlock; | |
814 | } | |
815 | ||
d0941ead | 816 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 817 | |
f126f733 BS |
818 | if (resume_delay) { |
819 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
820 | resume_delay); | |
821 | ssleep(resume_delay); | |
822 | } | |
823 | ||
0c8454f5 RW |
824 | /* Check if the device is there */ |
825 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
826 | |
827 | /* | |
828 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
829 | * integer format. (e.g. major:minor) | |
830 | */ | |
831 | if (isdigit(resume_file[0]) && resume_wait) { | |
832 | int partno; | |
833 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
834 | msleep(10); | |
835 | } | |
836 | ||
3efa147a | 837 | if (!swsusp_resume_device) { |
eed3ee08 AV |
838 | /* |
839 | * Some device discovery might still be in progress; we need | |
840 | * to wait for this to finish. | |
841 | */ | |
842 | wait_for_device_probe(); | |
6f8d7022 BS |
843 | |
844 | if (resume_wait) { | |
845 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
846 | msleep(10); | |
847 | async_synchronize_full(); | |
848 | } | |
849 | ||
3efa147a | 850 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
851 | if (!swsusp_resume_device) { |
852 | error = -ENODEV; | |
853 | goto Unlock; | |
854 | } | |
3efa147a PM |
855 | } |
856 | ||
0c8454f5 | 857 | Check_image: |
d0941ead | 858 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 859 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 860 | |
d0941ead | 861 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
862 | error = swsusp_check(); |
863 | if (error) | |
74dfd666 | 864 | goto Unlock; |
1da177e4 | 865 | |
0709db60 RW |
866 | /* The snapshot device should not be opened while we're running */ |
867 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
868 | error = -EBUSY; | |
76b57e61 | 869 | swsusp_close(FMODE_READ); |
0709db60 RW |
870 | goto Unlock; |
871 | } | |
872 | ||
5a0a2f30 | 873 | pm_prepare_console(); |
ea00f4f4 LW |
874 | error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); |
875 | if (error) { | |
876 | nr_calls--; | |
8fd37a4c | 877 | goto Close_Finish; |
ea00f4f4 | 878 | } |
1bfcf130 | 879 | |
74dfd666 | 880 | pr_debug("PM: Preparing processes for restore.\n"); |
03afed8b | 881 | error = freeze_processes(); |
8fd37a4c RW |
882 | if (error) |
883 | goto Close_Finish; | |
fe12c00d | 884 | error = load_image_and_restore(); |
8fd37a4c | 885 | thaw_processes(); |
0709db60 | 886 | Finish: |
ea00f4f4 | 887 | __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); |
5a0a2f30 | 888 | pm_restore_console(); |
0709db60 | 889 | atomic_inc(&snapshot_device_available); |
dd5d666b | 890 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 891 | Unlock: |
a6d70980 | 892 | mutex_unlock(&pm_mutex); |
d0941ead | 893 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 894 | return error; |
8fd37a4c | 895 | Close_Finish: |
76b57e61 JS |
896 | swsusp_close(FMODE_READ); |
897 | goto Finish; | |
1da177e4 LT |
898 | } |
899 | ||
d3c345db | 900 | late_initcall_sync(software_resume); |
1da177e4 LT |
901 | |
902 | ||
a3d25c27 RW |
903 | static const char * const hibernation_modes[] = { |
904 | [HIBERNATION_PLATFORM] = "platform", | |
905 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
906 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
907 | #ifdef CONFIG_SUSPEND |
908 | [HIBERNATION_SUSPEND] = "suspend", | |
909 | #endif | |
fe12c00d | 910 | [HIBERNATION_TEST_RESUME] = "test_resume", |
1da177e4 LT |
911 | }; |
912 | ||
f42a9813 RW |
913 | /* |
914 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 915 | * |
f42a9813 RW |
916 | * Hibernation can be handled in several ways. There are a few different ways |
917 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
918 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 919 | * mostly). |
1da177e4 | 920 | * |
f42a9813 RW |
921 | * The sysfs file /sys/power/disk provides an interface for selecting the |
922 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 923 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 924 | * |
1da177e4 LT |
925 | * 'platform' |
926 | * 'shutdown' | |
927 | * 'reboot' | |
928 | * | |
f42a9813 RW |
929 | * If a platform hibernation driver is in use, 'platform' will be supported |
930 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
931 | * The selected option (i.e. the one corresponding to the current value of | |
932 | * hibernation_mode) is enclosed by a square bracket. | |
933 | * | |
934 | * To select a given hibernation mode it is necessary to write the mode's | |
935 | * string representation (as returned by reading from /sys/power/disk) back | |
936 | * into /sys/power/disk. | |
1da177e4 LT |
937 | */ |
938 | ||
386f275f KS |
939 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
940 | char *buf) | |
1da177e4 | 941 | { |
f0ced9b2 JB |
942 | int i; |
943 | char *start = buf; | |
944 | ||
a6e15a39 KC |
945 | if (!hibernation_available()) |
946 | return sprintf(buf, "[disabled]\n"); | |
947 | ||
a3d25c27 RW |
948 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
949 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
950 | continue; |
951 | switch (i) { | |
a3d25c27 RW |
952 | case HIBERNATION_SHUTDOWN: |
953 | case HIBERNATION_REBOOT: | |
62c552cc BS |
954 | #ifdef CONFIG_SUSPEND |
955 | case HIBERNATION_SUSPEND: | |
956 | #endif | |
fe12c00d | 957 | case HIBERNATION_TEST_RESUME: |
f0ced9b2 | 958 | break; |
a3d25c27 RW |
959 | case HIBERNATION_PLATFORM: |
960 | if (hibernation_ops) | |
f0ced9b2 JB |
961 | break; |
962 | /* not a valid mode, continue with loop */ | |
963 | continue; | |
964 | } | |
a3d25c27 RW |
965 | if (i == hibernation_mode) |
966 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 967 | else |
a3d25c27 | 968 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
969 | } |
970 | buf += sprintf(buf, "\n"); | |
971 | return buf-start; | |
1da177e4 LT |
972 | } |
973 | ||
386f275f KS |
974 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
975 | const char *buf, size_t n) | |
1da177e4 LT |
976 | { |
977 | int error = 0; | |
978 | int i; | |
979 | int len; | |
980 | char *p; | |
a3d25c27 | 981 | int mode = HIBERNATION_INVALID; |
1da177e4 | 982 | |
a6e15a39 KC |
983 | if (!hibernation_available()) |
984 | return -EPERM; | |
985 | ||
1da177e4 LT |
986 | p = memchr(buf, '\n', n); |
987 | len = p ? p - buf : n; | |
988 | ||
bcda53fa | 989 | lock_system_sleep(); |
a3d25c27 | 990 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
991 | if (len == strlen(hibernation_modes[i]) |
992 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
993 | mode = i; |
994 | break; | |
995 | } | |
996 | } | |
a3d25c27 | 997 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 998 | switch (mode) { |
a3d25c27 RW |
999 | case HIBERNATION_SHUTDOWN: |
1000 | case HIBERNATION_REBOOT: | |
62c552cc BS |
1001 | #ifdef CONFIG_SUSPEND |
1002 | case HIBERNATION_SUSPEND: | |
1003 | #endif | |
fe12c00d | 1004 | case HIBERNATION_TEST_RESUME: |
a3d25c27 | 1005 | hibernation_mode = mode; |
fe0c935a | 1006 | break; |
a3d25c27 RW |
1007 | case HIBERNATION_PLATFORM: |
1008 | if (hibernation_ops) | |
1009 | hibernation_mode = mode; | |
1da177e4 LT |
1010 | else |
1011 | error = -EINVAL; | |
1012 | } | |
a3d25c27 | 1013 | } else |
1da177e4 LT |
1014 | error = -EINVAL; |
1015 | ||
a3d25c27 | 1016 | if (!error) |
23976728 | 1017 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 1018 | hibernation_modes[mode]); |
bcda53fa | 1019 | unlock_system_sleep(); |
1da177e4 LT |
1020 | return error ? error : n; |
1021 | } | |
1022 | ||
1023 | power_attr(disk); | |
1024 | ||
386f275f KS |
1025 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
1026 | char *buf) | |
1da177e4 LT |
1027 | { |
1028 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
1029 | MINOR(swsusp_resume_device)); | |
1030 | } | |
1031 | ||
386f275f KS |
1032 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
1033 | const char *buf, size_t n) | |
1da177e4 | 1034 | { |
1da177e4 | 1035 | dev_t res; |
421a5fa1 SC |
1036 | int len = n; |
1037 | char *name; | |
1da177e4 | 1038 | |
421a5fa1 SC |
1039 | if (len && buf[len-1] == '\n') |
1040 | len--; | |
1041 | name = kstrndup(buf, len, GFP_KERNEL); | |
1042 | if (!name) | |
1043 | return -ENOMEM; | |
1da177e4 | 1044 | |
421a5fa1 SC |
1045 | res = name_to_dev_t(name); |
1046 | kfree(name); | |
1047 | if (!res) | |
1048 | return -EINVAL; | |
1da177e4 | 1049 | |
bcda53fa | 1050 | lock_system_sleep(); |
a576219a | 1051 | swsusp_resume_device = res; |
bcda53fa | 1052 | unlock_system_sleep(); |
23976728 | 1053 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
1054 | noresume = 0; |
1055 | software_resume(); | |
421a5fa1 | 1056 | return n; |
1da177e4 LT |
1057 | } |
1058 | ||
1059 | power_attr(resume); | |
1060 | ||
386f275f KS |
1061 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1062 | char *buf) | |
ca0aec0f | 1063 | { |
853609b6 | 1064 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1065 | } |
1066 | ||
386f275f KS |
1067 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1068 | const char *buf, size_t n) | |
ca0aec0f | 1069 | { |
853609b6 | 1070 | unsigned long size; |
ca0aec0f | 1071 | |
853609b6 | 1072 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1073 | image_size = size; |
1074 | return n; | |
1075 | } | |
1076 | ||
1077 | return -EINVAL; | |
1078 | } | |
1079 | ||
1080 | power_attr(image_size); | |
1081 | ||
ddeb6487 RW |
1082 | static ssize_t reserved_size_show(struct kobject *kobj, |
1083 | struct kobj_attribute *attr, char *buf) | |
1084 | { | |
1085 | return sprintf(buf, "%lu\n", reserved_size); | |
1086 | } | |
1087 | ||
1088 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1089 | struct kobj_attribute *attr, | |
1090 | const char *buf, size_t n) | |
1091 | { | |
1092 | unsigned long size; | |
1093 | ||
1094 | if (sscanf(buf, "%lu", &size) == 1) { | |
1095 | reserved_size = size; | |
1096 | return n; | |
1097 | } | |
1098 | ||
1099 | return -EINVAL; | |
1100 | } | |
1101 | ||
1102 | power_attr(reserved_size); | |
1103 | ||
1da177e4 LT |
1104 | static struct attribute * g[] = { |
1105 | &disk_attr.attr, | |
1106 | &resume_attr.attr, | |
ca0aec0f | 1107 | &image_size_attr.attr, |
ddeb6487 | 1108 | &reserved_size_attr.attr, |
1da177e4 LT |
1109 | NULL, |
1110 | }; | |
1111 | ||
1112 | ||
1113 | static struct attribute_group attr_group = { | |
1114 | .attrs = g, | |
1115 | }; | |
1116 | ||
1117 | ||
1118 | static int __init pm_disk_init(void) | |
1119 | { | |
d76e15fb | 1120 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | core_initcall(pm_disk_init); | |
1124 | ||
1125 | ||
1126 | static int __init resume_setup(char *str) | |
1127 | { | |
1128 | if (noresume) | |
1129 | return 1; | |
1130 | ||
1131 | strncpy( resume_file, str, 255 ); | |
1132 | return 1; | |
1133 | } | |
1134 | ||
9a154d9d RW |
1135 | static int __init resume_offset_setup(char *str) |
1136 | { | |
1137 | unsigned long long offset; | |
1138 | ||
1139 | if (noresume) | |
1140 | return 1; | |
1141 | ||
1142 | if (sscanf(str, "%llu", &offset) == 1) | |
1143 | swsusp_resume_block = offset; | |
1144 | ||
1145 | return 1; | |
1146 | } | |
1147 | ||
f996fc96 BS |
1148 | static int __init hibernate_setup(char *str) |
1149 | { | |
2f88e41a | 1150 | if (!strncmp(str, "noresume", 8)) { |
f996fc96 | 1151 | noresume = 1; |
2f88e41a | 1152 | } else if (!strncmp(str, "nocompress", 10)) { |
f996fc96 | 1153 | nocompress = 1; |
2f88e41a | 1154 | } else if (!strncmp(str, "no", 2)) { |
a6e15a39 KC |
1155 | noresume = 1; |
1156 | nohibernate = 1; | |
4c0b6c10 RW |
1157 | } else if (IS_ENABLED(CONFIG_DEBUG_RODATA) |
1158 | && !strncmp(str, "protect_image", 13)) { | |
1159 | enable_restore_image_protection(); | |
a6e15a39 | 1160 | } |
f996fc96 BS |
1161 | return 1; |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | static int __init noresume_setup(char *str) |
1165 | { | |
1166 | noresume = 1; | |
1167 | return 1; | |
1168 | } | |
1169 | ||
6f8d7022 BS |
1170 | static int __init resumewait_setup(char *str) |
1171 | { | |
1172 | resume_wait = 1; | |
1173 | return 1; | |
1174 | } | |
1175 | ||
f126f733 BS |
1176 | static int __init resumedelay_setup(char *str) |
1177 | { | |
f6514be5 | 1178 | int rc = kstrtouint(str, 0, &resume_delay); |
317cf7e5 FF |
1179 | |
1180 | if (rc) | |
1181 | return rc; | |
f126f733 BS |
1182 | return 1; |
1183 | } | |
1184 | ||
a6e15a39 KC |
1185 | static int __init nohibernate_setup(char *str) |
1186 | { | |
1187 | noresume = 1; | |
1188 | nohibernate = 1; | |
1189 | return 1; | |
1190 | } | |
1191 | ||
1414c7f4 LA |
1192 | static int __init page_poison_nohibernate_setup(char *str) |
1193 | { | |
1194 | #ifdef CONFIG_PAGE_POISONING_ZERO | |
1195 | /* | |
1196 | * The zeroing option for page poison skips the checks on alloc. | |
1197 | * since hibernation doesn't save free pages there's no way to | |
1198 | * guarantee the pages will still be zeroed. | |
1199 | */ | |
1200 | if (!strcmp(str, "on")) { | |
1201 | pr_info("Disabling hibernation due to page poisoning\n"); | |
1202 | return nohibernate_setup(str); | |
1203 | } | |
1204 | #endif | |
1205 | return 1; | |
1206 | } | |
1207 | ||
1da177e4 | 1208 | __setup("noresume", noresume_setup); |
9a154d9d | 1209 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1210 | __setup("resume=", resume_setup); |
f996fc96 | 1211 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1212 | __setup("resumewait", resumewait_setup); |
f126f733 | 1213 | __setup("resumedelay=", resumedelay_setup); |
a6e15a39 | 1214 | __setup("nohibernate", nohibernate_setup); |
1414c7f4 | 1215 | __setup("page_poison=", page_poison_nohibernate_setup); |