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Commit | Line | Data |
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1da177e4 | 1 | /* |
8b759b84 | 2 | * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support. |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
a2531293 | 6 | * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz> |
8b759b84 | 7 | * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc. |
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 | ||
2872de13 RW |
13 | #define pr_fmt(fmt) "PM: " fmt |
14 | ||
6e5fdeed | 15 | #include <linux/export.h> |
1da177e4 LT |
16 | #include <linux/suspend.h> |
17 | #include <linux/syscalls.h> | |
18 | #include <linux/reboot.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/device.h> | |
6f8d7022 | 21 | #include <linux/async.h> |
1da177e4 LT |
22 | #include <linux/delay.h> |
23 | #include <linux/fs.h> | |
d53d9f16 | 24 | #include <linux/mount.h> |
88d10bba | 25 | #include <linux/pm.h> |
38b8d208 | 26 | #include <linux/nmi.h> |
97c7801c | 27 | #include <linux/console.h> |
e3920fb4 | 28 | #include <linux/cpu.h> |
7dfb7103 | 29 | #include <linux/freezer.h> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
40dc166c | 31 | #include <linux/syscore_ops.h> |
2df83fa4 MB |
32 | #include <linux/ctype.h> |
33 | #include <linux/genhd.h> | |
db597605 | 34 | #include <linux/ktime.h> |
bb3632c6 | 35 | #include <trace/events/power.h> |
d53d9f16 | 36 | |
1da177e4 LT |
37 | #include "power.h" |
38 | ||
39 | ||
d231ff1a BS |
40 | static int nocompress; |
41 | static int noresume; | |
a6e15a39 | 42 | static int nohibernate; |
d231ff1a | 43 | static int resume_wait; |
f6514be5 | 44 | static unsigned int resume_delay; |
47a460d5 | 45 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 46 | dev_t swsusp_resume_device; |
9a154d9d | 47 | sector_t swsusp_resume_block; |
d6efc2f7 | 48 | __visible int in_suspend __nosavedata; |
1da177e4 | 49 | |
a3d25c27 RW |
50 | enum { |
51 | HIBERNATION_INVALID, | |
52 | HIBERNATION_PLATFORM, | |
a3d25c27 RW |
53 | HIBERNATION_SHUTDOWN, |
54 | HIBERNATION_REBOOT, | |
62c552cc BS |
55 | #ifdef CONFIG_SUSPEND |
56 | HIBERNATION_SUSPEND, | |
57 | #endif | |
fe12c00d | 58 | HIBERNATION_TEST_RESUME, |
a3d25c27 RW |
59 | /* keep last */ |
60 | __HIBERNATION_AFTER_LAST | |
61 | }; | |
62 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
63 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
64 | ||
65 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
66 | ||
97819a26 | 67 | bool freezer_test_done; |
aa9a7b11 | 68 | |
073ef1f6 | 69 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 | 70 | |
a6e15a39 KC |
71 | bool hibernation_available(void) |
72 | { | |
73 | return (nohibernate == 0); | |
74 | } | |
75 | ||
a3d25c27 | 76 | /** |
f42a9813 RW |
77 | * hibernation_set_ops - Set the global hibernate operations. |
78 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 79 | */ |
073ef1f6 | 80 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 81 | { |
caea99ef RW |
82 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
83 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 84 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
85 | WARN_ON(1); |
86 | return; | |
87 | } | |
bcda53fa | 88 | lock_system_sleep(); |
a3d25c27 RW |
89 | hibernation_ops = ops; |
90 | if (ops) | |
91 | hibernation_mode = HIBERNATION_PLATFORM; | |
92 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
93 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
94 | ||
bcda53fa | 95 | unlock_system_sleep(); |
a3d25c27 | 96 | } |
e0c7855e | 97 | EXPORT_SYMBOL_GPL(hibernation_set_ops); |
a3d25c27 | 98 | |
abfe2d7b RW |
99 | static bool entering_platform_hibernation; |
100 | ||
101 | bool system_entering_hibernation(void) | |
102 | { | |
103 | return entering_platform_hibernation; | |
104 | } | |
105 | EXPORT_SYMBOL(system_entering_hibernation); | |
106 | ||
4cc79776 RW |
107 | #ifdef CONFIG_PM_DEBUG |
108 | static void hibernation_debug_sleep(void) | |
109 | { | |
2872de13 | 110 | pr_info("hibernation debug: Waiting for 5 seconds.\n"); |
4cc79776 RW |
111 | mdelay(5000); |
112 | } | |
113 | ||
4cc79776 RW |
114 | static int hibernation_test(int level) |
115 | { | |
116 | if (pm_test_level == level) { | |
117 | hibernation_debug_sleep(); | |
118 | return 1; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | #else /* !CONFIG_PM_DEBUG */ | |
4cc79776 RW |
123 | static int hibernation_test(int level) { return 0; } |
124 | #endif /* !CONFIG_PM_DEBUG */ | |
125 | ||
74f270af | 126 | /** |
f42a9813 RW |
127 | * platform_begin - Call platform to start hibernation. |
128 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 129 | */ |
caea99ef | 130 | static int platform_begin(int platform_mode) |
74f270af RW |
131 | { |
132 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
133 | hibernation_ops->begin() : 0; |
134 | } | |
135 | ||
136 | /** | |
f42a9813 RW |
137 | * platform_end - Call platform to finish transition to the working state. |
138 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 139 | */ |
caea99ef RW |
140 | static void platform_end(int platform_mode) |
141 | { | |
142 | if (platform_mode && hibernation_ops) | |
143 | hibernation_ops->end(); | |
74f270af | 144 | } |
a3d25c27 | 145 | |
8a05aac2 | 146 | /** |
f42a9813 RW |
147 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
148 | * @platform_mode: Whether or not to use the platform driver. | |
149 | * | |
150 | * Use the platform driver to prepare the system for creating a hibernate image, | |
151 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
152 | */ |
153 | ||
74f270af | 154 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 155 | { |
7777fab9 | 156 | return (platform_mode && hibernation_ops) ? |
74f270af | 157 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 158 | } |
8a05aac2 | 159 | |
c7e0831d | 160 | /** |
f42a9813 RW |
161 | * platform_leave - Call platform to prepare a transition to the working state. |
162 | * @platform_mode: Whether or not to use the platform driver. | |
163 | * | |
164 | * Use the platform driver prepare to prepare the machine for switching to the | |
165 | * normal mode of operation. | |
166 | * | |
167 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 168 | */ |
c7e0831d RW |
169 | static void platform_leave(int platform_mode) |
170 | { | |
171 | if (platform_mode && hibernation_ops) | |
172 | hibernation_ops->leave(); | |
173 | } | |
174 | ||
a3d25c27 | 175 | /** |
f42a9813 RW |
176 | * platform_finish - Call platform to switch the system to the working state. |
177 | * @platform_mode: Whether or not to use the platform driver. | |
178 | * | |
179 | * Use the platform driver to switch the machine to the normal mode of | |
180 | * operation. | |
181 | * | |
182 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 183 | */ |
7777fab9 | 184 | static void platform_finish(int platform_mode) |
a3d25c27 | 185 | { |
7777fab9 | 186 | if (platform_mode && hibernation_ops) |
a3d25c27 | 187 | hibernation_ops->finish(); |
8a05aac2 SS |
188 | } |
189 | ||
a634cc10 | 190 | /** |
f42a9813 RW |
191 | * platform_pre_restore - Prepare for hibernate image restoration. |
192 | * @platform_mode: Whether or not to use the platform driver. | |
193 | * | |
194 | * Use the platform driver to prepare the system for resume from a hibernation | |
195 | * image. | |
196 | * | |
197 | * If the restore fails after this function has been called, | |
198 | * platform_restore_cleanup() must be called. | |
a634cc10 | 199 | */ |
a634cc10 RW |
200 | static int platform_pre_restore(int platform_mode) |
201 | { | |
202 | return (platform_mode && hibernation_ops) ? | |
203 | hibernation_ops->pre_restore() : 0; | |
204 | } | |
205 | ||
206 | /** | |
f42a9813 RW |
207 | * platform_restore_cleanup - Switch to the working state after failing restore. |
208 | * @platform_mode: Whether or not to use the platform driver. | |
209 | * | |
210 | * Use the platform driver to switch the system to the normal mode of operation | |
211 | * after a failing restore. | |
212 | * | |
213 | * If platform_pre_restore() has been called before the failing restore, this | |
214 | * function must be called too, regardless of the result of | |
215 | * platform_pre_restore(). | |
a634cc10 | 216 | */ |
a634cc10 RW |
217 | static void platform_restore_cleanup(int platform_mode) |
218 | { | |
219 | if (platform_mode && hibernation_ops) | |
220 | hibernation_ops->restore_cleanup(); | |
221 | } | |
222 | ||
d8f3de0d | 223 | /** |
f42a9813 RW |
224 | * platform_recover - Recover from a failure to suspend devices. |
225 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 226 | */ |
d8f3de0d RW |
227 | static void platform_recover(int platform_mode) |
228 | { | |
229 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
230 | hibernation_ops->recover(); | |
231 | } | |
232 | ||
8e60c6a1 | 233 | /** |
f42a9813 RW |
234 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
235 | * @start: Starting event. | |
236 | * @stop: Final event. | |
237 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
238 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 239 | */ |
db597605 TR |
240 | void swsusp_show_speed(ktime_t start, ktime_t stop, |
241 | unsigned nr_pages, char *msg) | |
8e60c6a1 | 242 | { |
db597605 | 243 | ktime_t diff; |
4881f603 CG |
244 | u64 elapsed_centisecs64; |
245 | unsigned int centisecs; | |
246 | unsigned int k; | |
247 | unsigned int kps; | |
8e60c6a1 | 248 | |
db597605 TR |
249 | diff = ktime_sub(stop, start); |
250 | elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC); | |
8e60c6a1 NC |
251 | centisecs = elapsed_centisecs64; |
252 | if (centisecs == 0) | |
253 | centisecs = 1; /* avoid div-by-zero */ | |
254 | k = nr_pages * (PAGE_SIZE / 1024); | |
255 | kps = (k * 100) / centisecs; | |
2872de13 RW |
256 | pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n", |
257 | msg, k, centisecs / 100, centisecs % 100, kps / 1000, | |
258 | (kps % 1000) / 10); | |
8e60c6a1 NC |
259 | } |
260 | ||
c7e0831d | 261 | /** |
f42a9813 RW |
262 | * create_image - Create a hibernation image. |
263 | * @platform_mode: Whether or not to use the platform driver. | |
264 | * | |
cf579dfb RW |
265 | * Execute device drivers' "late" and "noirq" freeze callbacks, create a |
266 | * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. | |
f42a9813 RW |
267 | * |
268 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 269 | */ |
47a460d5 | 270 | static int create_image(int platform_mode) |
c7e0831d RW |
271 | { |
272 | int error; | |
273 | ||
cf579dfb | 274 | error = dpm_suspend_end(PMSG_FREEZE); |
c7e0831d | 275 | if (error) { |
2872de13 | 276 | pr_err("Some devices failed to power down, aborting hibernation\n"); |
32bdfac5 | 277 | return error; |
c7e0831d | 278 | } |
2ed8d2b3 | 279 | |
4aecd671 RW |
280 | error = platform_pre_snapshot(platform_mode); |
281 | if (error || hibernation_test(TEST_PLATFORM)) | |
282 | goto Platform_finish; | |
283 | ||
284 | error = disable_nonboot_cpus(); | |
48580ab8 | 285 | if (error || hibernation_test(TEST_CPUS)) |
4aecd671 RW |
286 | goto Enable_cpus; |
287 | ||
2ed8d2b3 RW |
288 | local_irq_disable(); |
289 | ||
2e711c04 | 290 | error = syscore_suspend(); |
770824bd | 291 | if (error) { |
2872de13 | 292 | pr_err("Some system devices failed to power down, 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(); |
62822e2e TG |
303 | /* Restore control flow magically appears here */ |
304 | restore_processor_state(); | |
bb3632c6 | 305 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false); |
c7e0831d | 306 | if (error) |
2872de13 RW |
307 | pr_err("Error %d creating hibernation image\n", error); |
308 | ||
1ad1410f | 309 | if (!in_suspend) { |
c125e96f | 310 | events_check_enabled = false; |
1ad1410f AA |
311 | clear_free_pages(); |
312 | } | |
362e77d1 BM |
313 | |
314 | platform_leave(platform_mode); | |
4aecd671 | 315 | |
4cc79776 | 316 | Power_up: |
40dc166c | 317 | syscore_resume(); |
2ed8d2b3 | 318 | |
4aecd671 | 319 | Enable_irqs: |
2ed8d2b3 RW |
320 | local_irq_enable(); |
321 | ||
4aecd671 RW |
322 | Enable_cpus: |
323 | enable_nonboot_cpus(); | |
324 | ||
325 | Platform_finish: | |
326 | platform_finish(platform_mode); | |
327 | ||
cf579dfb | 328 | dpm_resume_start(in_suspend ? |
1eede070 | 329 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 330 | |
c7e0831d RW |
331 | return error; |
332 | } | |
333 | ||
7777fab9 | 334 | /** |
f42a9813 RW |
335 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
336 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 337 | * |
f42a9813 | 338 | * This routine must be called with pm_mutex held. |
7777fab9 | 339 | */ |
7777fab9 RW |
340 | int hibernation_snapshot(int platform_mode) |
341 | { | |
953a2063 | 342 | pm_message_t msg; |
cbe2f5a6 | 343 | int error; |
7777fab9 | 344 | |
27614273 | 345 | pm_suspend_clear_flags(); |
3fe0313e | 346 | error = platform_begin(platform_mode); |
7777fab9 | 347 | if (error) |
d074ee02 | 348 | goto Close; |
7777fab9 | 349 | |
64a473cb RW |
350 | /* Preallocate image memory before shutting down devices. */ |
351 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
352 | if (error) |
353 | goto Close; | |
354 | ||
355 | error = freeze_kernel_threads(); | |
356 | if (error) | |
bb58dd5d | 357 | goto Cleanup; |
2aede851 | 358 | |
48580ab8 | 359 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
360 | |
361 | /* | |
362 | * Indicate to the caller that we are returning due to a | |
363 | * successful freezer test. | |
364 | */ | |
365 | freezer_test_done = true; | |
51d6ff7a | 366 | goto Thaw; |
aa9a7b11 SB |
367 | } |
368 | ||
2aede851 | 369 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 370 | if (error) { |
953a2063 | 371 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 372 | goto Thaw; |
bb58dd5d | 373 | } |
74f270af | 374 | |
7777fab9 | 375 | suspend_console(); |
c9e664f1 | 376 | pm_restrict_gfp_mask(); |
953a2063 | 377 | |
91e7c75b | 378 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 379 | |
953a2063 SB |
380 | if (error || hibernation_test(TEST_DEVICES)) |
381 | platform_recover(platform_mode); | |
382 | else | |
383 | error = create_image(platform_mode); | |
7777fab9 | 384 | |
c9e664f1 | 385 | /* |
953a2063 SB |
386 | * In the case that we call create_image() above, the control |
387 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
388 | * image creation has failed and (2) after a successful restore. |
389 | */ | |
4cc79776 | 390 | |
64a473cb RW |
391 | /* We may need to release the preallocated image pages here. */ |
392 | if (error || !in_suspend) | |
393 | swsusp_free(); | |
394 | ||
91e7c75b RW |
395 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
396 | dpm_resume(msg); | |
c9e664f1 RW |
397 | |
398 | if (error || !in_suspend) | |
399 | pm_restore_gfp_mask(); | |
400 | ||
7777fab9 | 401 | resume_console(); |
91e7c75b RW |
402 | dpm_complete(msg); |
403 | ||
caea99ef RW |
404 | Close: |
405 | platform_end(platform_mode); | |
7777fab9 | 406 | return error; |
d8f3de0d | 407 | |
51d6ff7a SB |
408 | Thaw: |
409 | thaw_kernel_threads(); | |
bb58dd5d RW |
410 | Cleanup: |
411 | swsusp_free(); | |
412 | goto Close; | |
7777fab9 RW |
413 | } |
414 | ||
406f992e RW |
415 | int __weak hibernate_resume_nonboot_cpu_disable(void) |
416 | { | |
417 | return disable_nonboot_cpus(); | |
418 | } | |
419 | ||
72df68ca | 420 | /** |
f42a9813 RW |
421 | * resume_target_kernel - Restore system state from a hibernation image. |
422 | * @platform_mode: Whether or not to use the platform driver. | |
423 | * | |
cf579dfb RW |
424 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
425 | * contents of highmem that have not been restored yet from the image and run | |
426 | * the low-level code that will restore the remaining contents of memory and | |
427 | * switch to the just restored target kernel. | |
72df68ca | 428 | */ |
4aecd671 | 429 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
430 | { |
431 | int error; | |
432 | ||
cf579dfb | 433 | error = dpm_suspend_end(PMSG_QUIESCE); |
72df68ca | 434 | if (error) { |
2872de13 | 435 | pr_err("Some devices failed to power down, aborting resume\n"); |
32bdfac5 | 436 | return error; |
72df68ca | 437 | } |
2ed8d2b3 | 438 | |
4aecd671 RW |
439 | error = platform_pre_restore(platform_mode); |
440 | if (error) | |
441 | goto Cleanup; | |
442 | ||
406f992e | 443 | error = hibernate_resume_nonboot_cpu_disable(); |
4aecd671 RW |
444 | if (error) |
445 | goto Enable_cpus; | |
446 | ||
2ed8d2b3 RW |
447 | local_irq_disable(); |
448 | ||
2e711c04 | 449 | error = syscore_suspend(); |
4aecd671 RW |
450 | if (error) |
451 | goto Enable_irqs; | |
452 | ||
72df68ca RW |
453 | save_processor_state(); |
454 | error = restore_highmem(); | |
455 | if (!error) { | |
456 | error = swsusp_arch_resume(); | |
457 | /* | |
458 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
459 | * Otherwise, execution continues at the place where |
460 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
461 | */ |
462 | BUG_ON(!error); | |
4e2d9491 RW |
463 | /* |
464 | * This call to restore_highmem() reverts the changes made by | |
465 | * the previous one. | |
466 | */ | |
72df68ca RW |
467 | restore_highmem(); |
468 | } | |
469 | /* | |
470 | * The only reason why swsusp_arch_resume() can fail is memory being | |
471 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 472 | * subsequent failures. |
72df68ca RW |
473 | */ |
474 | swsusp_free(); | |
475 | restore_processor_state(); | |
476 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 477 | |
40dc166c | 478 | syscore_resume(); |
2ed8d2b3 | 479 | |
4aecd671 | 480 | Enable_irqs: |
72df68ca | 481 | local_irq_enable(); |
2ed8d2b3 | 482 | |
4aecd671 RW |
483 | Enable_cpus: |
484 | enable_nonboot_cpus(); | |
485 | ||
486 | Cleanup: | |
487 | platform_restore_cleanup(platform_mode); | |
488 | ||
cf579dfb | 489 | dpm_resume_start(PMSG_RECOVER); |
2ed8d2b3 | 490 | |
72df68ca RW |
491 | return error; |
492 | } | |
493 | ||
7777fab9 | 494 | /** |
f42a9813 RW |
495 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
496 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 497 | * |
f42a9813 | 498 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 499 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 500 | */ |
a634cc10 | 501 | int hibernation_restore(int platform_mode) |
7777fab9 | 502 | { |
cbe2f5a6 | 503 | int error; |
7777fab9 RW |
504 | |
505 | pm_prepare_console(); | |
506 | suspend_console(); | |
c9e664f1 | 507 | pm_restrict_gfp_mask(); |
d1616302 | 508 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 509 | if (!error) { |
4aecd671 | 510 | error = resume_target_kernel(platform_mode); |
94fb823f ID |
511 | /* |
512 | * The above should either succeed and jump to the new kernel, | |
513 | * or return with an error. Otherwise things are just | |
514 | * undefined, so let's be paranoid. | |
515 | */ | |
516 | BUG_ON(!error); | |
a634cc10 | 517 | } |
94fb823f | 518 | dpm_resume_end(PMSG_RECOVER); |
c9e664f1 | 519 | pm_restore_gfp_mask(); |
7777fab9 RW |
520 | resume_console(); |
521 | pm_restore_console(); | |
522 | return error; | |
523 | } | |
524 | ||
525 | /** | |
f42a9813 | 526 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 527 | */ |
7777fab9 RW |
528 | int hibernation_platform_enter(void) |
529 | { | |
cbe2f5a6 | 530 | int error; |
b1457bcc | 531 | |
9cd9a005 RW |
532 | if (!hibernation_ops) |
533 | return -ENOSYS; | |
534 | ||
535 | /* | |
536 | * We have cancelled the power transition by running | |
537 | * hibernation_ops->finish() before saving the image, so we should let | |
538 | * the firmware know that we're going to enter the sleep state after all | |
539 | */ | |
caea99ef | 540 | error = hibernation_ops->begin(); |
9cd9a005 | 541 | if (error) |
caea99ef | 542 | goto Close; |
9cd9a005 | 543 | |
abfe2d7b | 544 | entering_platform_hibernation = true; |
9cd9a005 | 545 | suspend_console(); |
d1616302 | 546 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
547 | if (error) { |
548 | if (hibernation_ops->recover) | |
549 | hibernation_ops->recover(); | |
550 | goto Resume_devices; | |
551 | } | |
9cd9a005 | 552 | |
cf579dfb | 553 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 554 | if (error) |
32bdfac5 | 555 | goto Resume_devices; |
4aecd671 | 556 | |
9cd9a005 RW |
557 | error = hibernation_ops->prepare(); |
558 | if (error) | |
e681c9dd | 559 | goto Platform_finish; |
9cd9a005 RW |
560 | |
561 | error = disable_nonboot_cpus(); | |
562 | if (error) | |
8c506608 | 563 | goto Enable_cpus; |
2ed8d2b3 | 564 | |
4aecd671 | 565 | local_irq_disable(); |
40dc166c | 566 | syscore_suspend(); |
a2867e08 | 567 | if (pm_wakeup_pending()) { |
c125e96f RW |
568 | error = -EAGAIN; |
569 | goto Power_up; | |
570 | } | |
571 | ||
4aecd671 RW |
572 | hibernation_ops->enter(); |
573 | /* We should never get here */ | |
574 | while (1); | |
9cd9a005 | 575 | |
c125e96f | 576 | Power_up: |
40dc166c | 577 | syscore_resume(); |
c125e96f | 578 | local_irq_enable(); |
8c506608 VK |
579 | |
580 | Enable_cpus: | |
c125e96f RW |
581 | enable_nonboot_cpus(); |
582 | ||
e681c9dd | 583 | Platform_finish: |
9cd9a005 | 584 | hibernation_ops->finish(); |
2ed8d2b3 | 585 | |
cf579dfb | 586 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 587 | |
9cd9a005 | 588 | Resume_devices: |
abfe2d7b | 589 | entering_platform_hibernation = false; |
d1616302 | 590 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 591 | resume_console(); |
2ed8d2b3 | 592 | |
caea99ef RW |
593 | Close: |
594 | hibernation_ops->end(); | |
2ed8d2b3 | 595 | |
b1457bcc | 596 | return error; |
7777fab9 RW |
597 | } |
598 | ||
1da177e4 | 599 | /** |
f42a9813 | 600 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 601 | * |
f42a9813 RW |
602 | * Use the platform driver, if configured, to put the system into the sleep |
603 | * state corresponding to hibernation, or try to power it off or reboot, | |
604 | * depending on the value of hibernation_mode. | |
1da177e4 | 605 | */ |
fe0c935a | 606 | static void power_down(void) |
1da177e4 | 607 | { |
62c552cc BS |
608 | #ifdef CONFIG_SUSPEND |
609 | int error; | |
81d45bdf RW |
610 | |
611 | if (hibernation_mode == HIBERNATION_SUSPEND) { | |
612 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
613 | if (error) { | |
614 | hibernation_mode = hibernation_ops ? | |
615 | HIBERNATION_PLATFORM : | |
616 | HIBERNATION_SHUTDOWN; | |
617 | } else { | |
618 | /* Restore swap signature. */ | |
619 | error = swsusp_unmark(); | |
620 | if (error) | |
2872de13 | 621 | pr_err("Swap will be unusable! Try swapon -a.\n"); |
81d45bdf RW |
622 | |
623 | return; | |
624 | } | |
625 | } | |
62c552cc BS |
626 | #endif |
627 | ||
a3d25c27 | 628 | switch (hibernation_mode) { |
a3d25c27 | 629 | case HIBERNATION_REBOOT: |
fdde86ac | 630 | kernel_restart(NULL); |
1da177e4 | 631 | break; |
a3d25c27 | 632 | case HIBERNATION_PLATFORM: |
7777fab9 | 633 | hibernation_platform_enter(); |
9cd9a005 | 634 | case HIBERNATION_SHUTDOWN: |
2c730785 SC |
635 | if (pm_power_off) |
636 | kernel_power_off(); | |
9cd9a005 | 637 | break; |
1da177e4 | 638 | } |
fdde86ac | 639 | kernel_halt(); |
fe0c935a JB |
640 | /* |
641 | * Valid image is on the disk, if we continue we risk serious data | |
642 | * corruption after resume. | |
643 | */ | |
2872de13 | 644 | pr_crit("Power down manually\n"); |
2c730785 SC |
645 | while (1) |
646 | cpu_relax(); | |
1da177e4 LT |
647 | } |
648 | ||
fe12c00d CY |
649 | static int load_image_and_restore(void) |
650 | { | |
651 | int error; | |
652 | unsigned int flags; | |
653 | ||
2872de13 | 654 | pr_debug("Loading hibernation image.\n"); |
fe12c00d CY |
655 | |
656 | lock_device_hotplug(); | |
657 | error = create_basic_memory_bitmaps(); | |
658 | if (error) | |
659 | goto Unlock; | |
660 | ||
661 | error = swsusp_read(&flags); | |
662 | swsusp_close(FMODE_READ); | |
663 | if (!error) | |
664 | hibernation_restore(flags & SF_PLATFORM_MODE); | |
665 | ||
2872de13 | 666 | pr_err("Failed to load hibernation image, recovering.\n"); |
fe12c00d CY |
667 | swsusp_free(); |
668 | free_basic_memory_bitmaps(); | |
669 | Unlock: | |
670 | unlock_device_hotplug(); | |
671 | ||
672 | return error; | |
673 | } | |
674 | ||
1da177e4 | 675 | /** |
f42a9813 | 676 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 677 | */ |
a3d25c27 | 678 | int hibernate(void) |
1da177e4 | 679 | { |
ea00f4f4 | 680 | int error, nr_calls = 0; |
fe12c00d | 681 | bool snapshot_test = false; |
1da177e4 | 682 | |
a6e15a39 | 683 | if (!hibernation_available()) { |
2872de13 | 684 | pr_debug("Hibernation not available.\n"); |
a6e15a39 KC |
685 | return -EPERM; |
686 | } | |
687 | ||
bcda53fa | 688 | lock_system_sleep(); |
0709db60 | 689 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
690 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
691 | error = -EBUSY; | |
692 | goto Unlock; | |
693 | } | |
694 | ||
5a0a2f30 | 695 | pm_prepare_console(); |
ea00f4f4 LW |
696 | error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); |
697 | if (error) { | |
698 | nr_calls--; | |
b10d9117 | 699 | goto Exit; |
ea00f4f4 | 700 | } |
0709db60 | 701 | |
2872de13 | 702 | pr_info("Syncing filesystems ... \n"); |
232b1432 | 703 | sys_sync(); |
2872de13 | 704 | pr_info("done.\n"); |
232b1432 | 705 | |
03afed8b | 706 | error = freeze_processes(); |
5a72e04d | 707 | if (error) |
8fd37a4c RW |
708 | goto Exit; |
709 | ||
942f4015 | 710 | lock_device_hotplug(); |
8fd37a4c RW |
711 | /* Allocate memory management structures */ |
712 | error = create_basic_memory_bitmaps(); | |
713 | if (error) | |
714 | goto Thaw; | |
1da177e4 | 715 | |
7777fab9 | 716 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 717 | if (error || freezer_test_done) |
8fd37a4c | 718 | goto Free_bitmaps; |
64a473cb RW |
719 | |
720 | if (in_suspend) { | |
a634cc10 RW |
721 | unsigned int flags = 0; |
722 | ||
723 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
724 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
725 | if (nocompress) |
726 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
727 | else |
728 | flags |= SF_CRC32_MODE; | |
729 | ||
2872de13 | 730 | pr_debug("Writing image.\n"); |
a634cc10 | 731 | error = swsusp_write(flags); |
7777fab9 | 732 | swsusp_free(); |
fe12c00d CY |
733 | if (!error) { |
734 | if (hibernation_mode == HIBERNATION_TEST_RESUME) | |
735 | snapshot_test = true; | |
736 | else | |
737 | power_down(); | |
738 | } | |
5262a475 | 739 | in_suspend = 0; |
c9e664f1 | 740 | pm_restore_gfp_mask(); |
b918f6e6 | 741 | } else { |
2872de13 | 742 | pr_debug("Image restored successfully.\n"); |
b918f6e6 | 743 | } |
64a473cb | 744 | |
8fd37a4c RW |
745 | Free_bitmaps: |
746 | free_basic_memory_bitmaps(); | |
b918f6e6 | 747 | Thaw: |
942f4015 | 748 | unlock_device_hotplug(); |
fe12c00d | 749 | if (snapshot_test) { |
2872de13 | 750 | pr_debug("Checking hibernation image\n"); |
fe12c00d CY |
751 | error = swsusp_check(); |
752 | if (!error) | |
753 | error = load_image_and_restore(); | |
754 | } | |
5a0a2f30 | 755 | thaw_processes(); |
a556d5b5 SB |
756 | |
757 | /* Don't bother checking whether freezer_test_done is true */ | |
758 | freezer_test_done = false; | |
0709db60 | 759 | Exit: |
ea00f4f4 | 760 | __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL); |
5a0a2f30 | 761 | pm_restore_console(); |
0709db60 | 762 | atomic_inc(&snapshot_device_available); |
b10d9117 | 763 | Unlock: |
bcda53fa | 764 | unlock_system_sleep(); |
1da177e4 LT |
765 | return error; |
766 | } | |
767 | ||
768 | ||
769 | /** | |
f42a9813 RW |
770 | * software_resume - Resume from a saved hibernation image. |
771 | * | |
772 | * This routine is called as a late initcall, when all devices have been | |
773 | * discovered and initialized already. | |
1da177e4 | 774 | * |
f42a9813 RW |
775 | * The image reading code is called to see if there is a hibernation image |
776 | * available for reading. If that is the case, devices are quiesced and the | |
777 | * contents of memory is restored from the saved image. | |
1da177e4 | 778 | * |
f42a9813 | 779 | * If this is successful, control reappears in the restored target kernel in |
d439e64f | 780 | * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine |
f42a9813 RW |
781 | * attempts to recover gracefully and make the kernel return to the normal mode |
782 | * of operation. | |
1da177e4 | 783 | */ |
1da177e4 LT |
784 | static int software_resume(void) |
785 | { | |
ea00f4f4 | 786 | int error, nr_calls = 0; |
1da177e4 | 787 | |
eed3ee08 AV |
788 | /* |
789 | * If the user said "noresume".. bail out early. | |
790 | */ | |
a6e15a39 | 791 | if (noresume || !hibernation_available()) |
eed3ee08 AV |
792 | return 0; |
793 | ||
60a0d233 JB |
794 | /* |
795 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
796 | * is configured into the kernel. Since the regular hibernate | |
797 | * trigger path is via sysfs which takes a buffer mutex before | |
798 | * calling hibernate functions (which take pm_mutex) this can | |
799 | * cause lockdep to complain about a possible ABBA deadlock | |
800 | * which cannot happen since we're in the boot code here and | |
801 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
802 | * here to avoid lockdep complaining. | |
803 | */ | |
804 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
805 | |
806 | if (swsusp_resume_device) | |
807 | goto Check_image; | |
808 | ||
809 | if (!strlen(resume_file)) { | |
810 | error = -ENOENT; | |
811 | goto Unlock; | |
812 | } | |
813 | ||
2872de13 | 814 | pr_debug("Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 815 | |
f126f733 | 816 | if (resume_delay) { |
2872de13 | 817 | pr_info("Waiting %dsec before reading resume device ...\n", |
f126f733 BS |
818 | resume_delay); |
819 | ssleep(resume_delay); | |
820 | } | |
821 | ||
0c8454f5 RW |
822 | /* Check if the device is there */ |
823 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
824 | |
825 | /* | |
826 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
827 | * integer format. (e.g. major:minor) | |
828 | */ | |
829 | if (isdigit(resume_file[0]) && resume_wait) { | |
830 | int partno; | |
831 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
832 | msleep(10); | |
833 | } | |
834 | ||
3efa147a | 835 | if (!swsusp_resume_device) { |
eed3ee08 AV |
836 | /* |
837 | * Some device discovery might still be in progress; we need | |
838 | * to wait for this to finish. | |
839 | */ | |
840 | wait_for_device_probe(); | |
6f8d7022 BS |
841 | |
842 | if (resume_wait) { | |
843 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
844 | msleep(10); | |
845 | async_synchronize_full(); | |
846 | } | |
847 | ||
3efa147a | 848 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
849 | if (!swsusp_resume_device) { |
850 | error = -ENODEV; | |
851 | goto Unlock; | |
852 | } | |
3efa147a PM |
853 | } |
854 | ||
0c8454f5 | 855 | Check_image: |
2872de13 | 856 | pr_debug("Hibernation image partition %d:%d present\n", |
0c8454f5 | 857 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 858 | |
2872de13 | 859 | pr_debug("Looking for hibernation image.\n"); |
ed746e3b RW |
860 | error = swsusp_check(); |
861 | if (error) | |
74dfd666 | 862 | goto Unlock; |
1da177e4 | 863 | |
0709db60 RW |
864 | /* The snapshot device should not be opened while we're running */ |
865 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
866 | error = -EBUSY; | |
76b57e61 | 867 | swsusp_close(FMODE_READ); |
0709db60 RW |
868 | goto Unlock; |
869 | } | |
870 | ||
5a0a2f30 | 871 | pm_prepare_console(); |
ea00f4f4 LW |
872 | error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); |
873 | if (error) { | |
874 | nr_calls--; | |
8fd37a4c | 875 | goto Close_Finish; |
ea00f4f4 | 876 | } |
1bfcf130 | 877 | |
2872de13 | 878 | pr_debug("Preparing processes for restore.\n"); |
03afed8b | 879 | error = freeze_processes(); |
8fd37a4c RW |
880 | if (error) |
881 | goto Close_Finish; | |
fe12c00d | 882 | error = load_image_and_restore(); |
8fd37a4c | 883 | thaw_processes(); |
0709db60 | 884 | Finish: |
ea00f4f4 | 885 | __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); |
5a0a2f30 | 886 | pm_restore_console(); |
0709db60 | 887 | atomic_inc(&snapshot_device_available); |
dd5d666b | 888 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 889 | Unlock: |
a6d70980 | 890 | mutex_unlock(&pm_mutex); |
2872de13 | 891 | pr_debug("Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 892 | return error; |
8fd37a4c | 893 | Close_Finish: |
76b57e61 JS |
894 | swsusp_close(FMODE_READ); |
895 | goto Finish; | |
1da177e4 LT |
896 | } |
897 | ||
d3c345db | 898 | late_initcall_sync(software_resume); |
1da177e4 LT |
899 | |
900 | ||
a3d25c27 RW |
901 | static const char * const hibernation_modes[] = { |
902 | [HIBERNATION_PLATFORM] = "platform", | |
903 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
904 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
905 | #ifdef CONFIG_SUSPEND |
906 | [HIBERNATION_SUSPEND] = "suspend", | |
907 | #endif | |
fe12c00d | 908 | [HIBERNATION_TEST_RESUME] = "test_resume", |
1da177e4 LT |
909 | }; |
910 | ||
f42a9813 RW |
911 | /* |
912 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 913 | * |
f42a9813 RW |
914 | * Hibernation can be handled in several ways. There are a few different ways |
915 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
916 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 917 | * mostly). |
1da177e4 | 918 | * |
f42a9813 RW |
919 | * The sysfs file /sys/power/disk provides an interface for selecting the |
920 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 921 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 922 | * |
1da177e4 LT |
923 | * 'platform' |
924 | * 'shutdown' | |
925 | * 'reboot' | |
926 | * | |
f42a9813 RW |
927 | * If a platform hibernation driver is in use, 'platform' will be supported |
928 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
929 | * The selected option (i.e. the one corresponding to the current value of | |
930 | * hibernation_mode) is enclosed by a square bracket. | |
931 | * | |
932 | * To select a given hibernation mode it is necessary to write the mode's | |
933 | * string representation (as returned by reading from /sys/power/disk) back | |
934 | * into /sys/power/disk. | |
1da177e4 LT |
935 | */ |
936 | ||
386f275f KS |
937 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
938 | char *buf) | |
1da177e4 | 939 | { |
f0ced9b2 JB |
940 | int i; |
941 | char *start = buf; | |
942 | ||
a6e15a39 KC |
943 | if (!hibernation_available()) |
944 | return sprintf(buf, "[disabled]\n"); | |
945 | ||
a3d25c27 RW |
946 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
947 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
948 | continue; |
949 | switch (i) { | |
a3d25c27 RW |
950 | case HIBERNATION_SHUTDOWN: |
951 | case HIBERNATION_REBOOT: | |
62c552cc BS |
952 | #ifdef CONFIG_SUSPEND |
953 | case HIBERNATION_SUSPEND: | |
954 | #endif | |
fe12c00d | 955 | case HIBERNATION_TEST_RESUME: |
f0ced9b2 | 956 | break; |
a3d25c27 RW |
957 | case HIBERNATION_PLATFORM: |
958 | if (hibernation_ops) | |
f0ced9b2 JB |
959 | break; |
960 | /* not a valid mode, continue with loop */ | |
961 | continue; | |
962 | } | |
a3d25c27 RW |
963 | if (i == hibernation_mode) |
964 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 965 | else |
a3d25c27 | 966 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
967 | } |
968 | buf += sprintf(buf, "\n"); | |
969 | return buf-start; | |
1da177e4 LT |
970 | } |
971 | ||
386f275f KS |
972 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
973 | const char *buf, size_t n) | |
1da177e4 LT |
974 | { |
975 | int error = 0; | |
976 | int i; | |
977 | int len; | |
978 | char *p; | |
a3d25c27 | 979 | int mode = HIBERNATION_INVALID; |
1da177e4 | 980 | |
a6e15a39 KC |
981 | if (!hibernation_available()) |
982 | return -EPERM; | |
983 | ||
1da177e4 LT |
984 | p = memchr(buf, '\n', n); |
985 | len = p ? p - buf : n; | |
986 | ||
bcda53fa | 987 | lock_system_sleep(); |
a3d25c27 | 988 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
989 | if (len == strlen(hibernation_modes[i]) |
990 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
991 | mode = i; |
992 | break; | |
993 | } | |
994 | } | |
a3d25c27 | 995 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 996 | switch (mode) { |
a3d25c27 RW |
997 | case HIBERNATION_SHUTDOWN: |
998 | case HIBERNATION_REBOOT: | |
62c552cc BS |
999 | #ifdef CONFIG_SUSPEND |
1000 | case HIBERNATION_SUSPEND: | |
1001 | #endif | |
fe12c00d | 1002 | case HIBERNATION_TEST_RESUME: |
a3d25c27 | 1003 | hibernation_mode = mode; |
fe0c935a | 1004 | break; |
a3d25c27 RW |
1005 | case HIBERNATION_PLATFORM: |
1006 | if (hibernation_ops) | |
1007 | hibernation_mode = mode; | |
1da177e4 LT |
1008 | else |
1009 | error = -EINVAL; | |
1010 | } | |
a3d25c27 | 1011 | } else |
1da177e4 LT |
1012 | error = -EINVAL; |
1013 | ||
a3d25c27 | 1014 | if (!error) |
2872de13 | 1015 | pr_debug("Hibernation mode set to '%s'\n", |
a3d25c27 | 1016 | hibernation_modes[mode]); |
bcda53fa | 1017 | unlock_system_sleep(); |
1da177e4 LT |
1018 | return error ? error : n; |
1019 | } | |
1020 | ||
1021 | power_attr(disk); | |
1022 | ||
386f275f KS |
1023 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
1024 | char *buf) | |
1da177e4 LT |
1025 | { |
1026 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
1027 | MINOR(swsusp_resume_device)); | |
1028 | } | |
1029 | ||
386f275f KS |
1030 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
1031 | const char *buf, size_t n) | |
1da177e4 | 1032 | { |
1da177e4 | 1033 | dev_t res; |
421a5fa1 SC |
1034 | int len = n; |
1035 | char *name; | |
1da177e4 | 1036 | |
421a5fa1 SC |
1037 | if (len && buf[len-1] == '\n') |
1038 | len--; | |
1039 | name = kstrndup(buf, len, GFP_KERNEL); | |
1040 | if (!name) | |
1041 | return -ENOMEM; | |
1da177e4 | 1042 | |
421a5fa1 SC |
1043 | res = name_to_dev_t(name); |
1044 | kfree(name); | |
1045 | if (!res) | |
1046 | return -EINVAL; | |
1da177e4 | 1047 | |
bcda53fa | 1048 | lock_system_sleep(); |
a576219a | 1049 | swsusp_resume_device = res; |
bcda53fa | 1050 | unlock_system_sleep(); |
2872de13 | 1051 | pr_info("Starting manual resume from disk\n"); |
a576219a AM |
1052 | noresume = 0; |
1053 | software_resume(); | |
421a5fa1 | 1054 | return n; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | power_attr(resume); | |
1058 | ||
386f275f KS |
1059 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1060 | char *buf) | |
ca0aec0f | 1061 | { |
853609b6 | 1062 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1063 | } |
1064 | ||
386f275f KS |
1065 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1066 | const char *buf, size_t n) | |
ca0aec0f | 1067 | { |
853609b6 | 1068 | unsigned long size; |
ca0aec0f | 1069 | |
853609b6 | 1070 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1071 | image_size = size; |
1072 | return n; | |
1073 | } | |
1074 | ||
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | power_attr(image_size); | |
1079 | ||
ddeb6487 RW |
1080 | static ssize_t reserved_size_show(struct kobject *kobj, |
1081 | struct kobj_attribute *attr, char *buf) | |
1082 | { | |
1083 | return sprintf(buf, "%lu\n", reserved_size); | |
1084 | } | |
1085 | ||
1086 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1087 | struct kobj_attribute *attr, | |
1088 | const char *buf, size_t n) | |
1089 | { | |
1090 | unsigned long size; | |
1091 | ||
1092 | if (sscanf(buf, "%lu", &size) == 1) { | |
1093 | reserved_size = size; | |
1094 | return n; | |
1095 | } | |
1096 | ||
1097 | return -EINVAL; | |
1098 | } | |
1099 | ||
1100 | power_attr(reserved_size); | |
1101 | ||
1da177e4 LT |
1102 | static struct attribute * g[] = { |
1103 | &disk_attr.attr, | |
1104 | &resume_attr.attr, | |
ca0aec0f | 1105 | &image_size_attr.attr, |
ddeb6487 | 1106 | &reserved_size_attr.attr, |
1da177e4 LT |
1107 | NULL, |
1108 | }; | |
1109 | ||
1110 | ||
1111 | static struct attribute_group attr_group = { | |
1112 | .attrs = g, | |
1113 | }; | |
1114 | ||
1115 | ||
1116 | static int __init pm_disk_init(void) | |
1117 | { | |
d76e15fb | 1118 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | core_initcall(pm_disk_init); | |
1122 | ||
1123 | ||
1124 | static int __init resume_setup(char *str) | |
1125 | { | |
1126 | if (noresume) | |
1127 | return 1; | |
1128 | ||
1129 | strncpy( resume_file, str, 255 ); | |
1130 | return 1; | |
1131 | } | |
1132 | ||
9a154d9d RW |
1133 | static int __init resume_offset_setup(char *str) |
1134 | { | |
1135 | unsigned long long offset; | |
1136 | ||
1137 | if (noresume) | |
1138 | return 1; | |
1139 | ||
1140 | if (sscanf(str, "%llu", &offset) == 1) | |
1141 | swsusp_resume_block = offset; | |
1142 | ||
1143 | return 1; | |
1144 | } | |
1145 | ||
f996fc96 BS |
1146 | static int __init hibernate_setup(char *str) |
1147 | { | |
2f88e41a | 1148 | if (!strncmp(str, "noresume", 8)) { |
f996fc96 | 1149 | noresume = 1; |
2f88e41a | 1150 | } else if (!strncmp(str, "nocompress", 10)) { |
f996fc96 | 1151 | nocompress = 1; |
2f88e41a | 1152 | } else if (!strncmp(str, "no", 2)) { |
a6e15a39 KC |
1153 | noresume = 1; |
1154 | nohibernate = 1; | |
0f5bf6d0 | 1155 | } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) |
4c0b6c10 RW |
1156 | && !strncmp(str, "protect_image", 13)) { |
1157 | enable_restore_image_protection(); | |
a6e15a39 | 1158 | } |
f996fc96 BS |
1159 | return 1; |
1160 | } | |
1161 | ||
1da177e4 LT |
1162 | static int __init noresume_setup(char *str) |
1163 | { | |
1164 | noresume = 1; | |
1165 | return 1; | |
1166 | } | |
1167 | ||
6f8d7022 BS |
1168 | static int __init resumewait_setup(char *str) |
1169 | { | |
1170 | resume_wait = 1; | |
1171 | return 1; | |
1172 | } | |
1173 | ||
f126f733 BS |
1174 | static int __init resumedelay_setup(char *str) |
1175 | { | |
f6514be5 | 1176 | int rc = kstrtouint(str, 0, &resume_delay); |
317cf7e5 FF |
1177 | |
1178 | if (rc) | |
1179 | return rc; | |
f126f733 BS |
1180 | return 1; |
1181 | } | |
1182 | ||
a6e15a39 KC |
1183 | static int __init nohibernate_setup(char *str) |
1184 | { | |
1185 | noresume = 1; | |
1186 | nohibernate = 1; | |
1187 | return 1; | |
1188 | } | |
1189 | ||
1da177e4 | 1190 | __setup("noresume", noresume_setup); |
9a154d9d | 1191 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1192 | __setup("resume=", resume_setup); |
f996fc96 | 1193 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1194 | __setup("resumewait", resumewait_setup); |
f126f733 | 1195 | __setup("resumedelay=", resumedelay_setup); |
a6e15a39 | 1196 | __setup("nohibernate", nohibernate_setup); |