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 | ||
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); |
05db6ce8 HK |
302 | dbg_snapshot_suspend("machine_suspend", swsusp_arch_suspend, |
303 | NULL, PM_EVENT_HIBERNATE, DSS_FLAG_IN); | |
c7e0831d | 304 | error = swsusp_arch_suspend(); |
62822e2e TG |
305 | /* Restore control flow magically appears here */ |
306 | restore_processor_state(); | |
05db6ce8 HK |
307 | dbg_snapshot_suspend("machine_suspend", swsusp_arch_suspend, |
308 | NULL, PM_EVENT_HIBERNATE, DSS_FLAG_OUT); | |
bb3632c6 | 309 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false); |
c7e0831d | 310 | if (error) |
2872de13 RW |
311 | pr_err("Error %d creating hibernation image\n", error); |
312 | ||
1ad1410f | 313 | if (!in_suspend) { |
c125e96f | 314 | events_check_enabled = false; |
1ad1410f AA |
315 | clear_free_pages(); |
316 | } | |
362e77d1 BM |
317 | |
318 | platform_leave(platform_mode); | |
4aecd671 | 319 | |
4cc79776 | 320 | Power_up: |
40dc166c | 321 | syscore_resume(); |
2ed8d2b3 | 322 | |
4aecd671 | 323 | Enable_irqs: |
2ed8d2b3 RW |
324 | local_irq_enable(); |
325 | ||
4aecd671 RW |
326 | Enable_cpus: |
327 | enable_nonboot_cpus(); | |
328 | ||
329 | Platform_finish: | |
330 | platform_finish(platform_mode); | |
331 | ||
cf579dfb | 332 | dpm_resume_start(in_suspend ? |
1eede070 | 333 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 334 | |
c7e0831d RW |
335 | return error; |
336 | } | |
337 | ||
7777fab9 | 338 | /** |
f42a9813 RW |
339 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
340 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 341 | * |
f42a9813 | 342 | * This routine must be called with pm_mutex held. |
7777fab9 | 343 | */ |
7777fab9 RW |
344 | int hibernation_snapshot(int platform_mode) |
345 | { | |
953a2063 | 346 | pm_message_t msg; |
cbe2f5a6 | 347 | int error; |
7777fab9 | 348 | |
27614273 | 349 | pm_suspend_clear_flags(); |
3fe0313e | 350 | error = platform_begin(platform_mode); |
7777fab9 | 351 | if (error) |
d074ee02 | 352 | goto Close; |
7777fab9 | 353 | |
64a473cb RW |
354 | /* Preallocate image memory before shutting down devices. */ |
355 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
356 | if (error) |
357 | goto Close; | |
358 | ||
359 | error = freeze_kernel_threads(); | |
360 | if (error) | |
bb58dd5d | 361 | goto Cleanup; |
2aede851 | 362 | |
48580ab8 | 363 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
364 | |
365 | /* | |
366 | * Indicate to the caller that we are returning due to a | |
367 | * successful freezer test. | |
368 | */ | |
369 | freezer_test_done = true; | |
51d6ff7a | 370 | goto Thaw; |
aa9a7b11 SB |
371 | } |
372 | ||
2aede851 | 373 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 374 | if (error) { |
953a2063 | 375 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 376 | goto Thaw; |
bb58dd5d | 377 | } |
74f270af | 378 | |
7777fab9 | 379 | suspend_console(); |
c9e664f1 | 380 | pm_restrict_gfp_mask(); |
953a2063 | 381 | |
91e7c75b | 382 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 383 | |
953a2063 SB |
384 | if (error || hibernation_test(TEST_DEVICES)) |
385 | platform_recover(platform_mode); | |
386 | else | |
387 | error = create_image(platform_mode); | |
7777fab9 | 388 | |
c9e664f1 | 389 | /* |
953a2063 SB |
390 | * In the case that we call create_image() above, the control |
391 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
392 | * image creation has failed and (2) after a successful restore. |
393 | */ | |
4cc79776 | 394 | |
64a473cb RW |
395 | /* We may need to release the preallocated image pages here. */ |
396 | if (error || !in_suspend) | |
397 | swsusp_free(); | |
398 | ||
91e7c75b RW |
399 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
400 | dpm_resume(msg); | |
c9e664f1 RW |
401 | |
402 | if (error || !in_suspend) | |
403 | pm_restore_gfp_mask(); | |
404 | ||
7777fab9 | 405 | resume_console(); |
91e7c75b RW |
406 | dpm_complete(msg); |
407 | ||
caea99ef RW |
408 | Close: |
409 | platform_end(platform_mode); | |
7777fab9 | 410 | return error; |
d8f3de0d | 411 | |
51d6ff7a SB |
412 | Thaw: |
413 | thaw_kernel_threads(); | |
bb58dd5d RW |
414 | Cleanup: |
415 | swsusp_free(); | |
416 | goto Close; | |
7777fab9 RW |
417 | } |
418 | ||
406f992e RW |
419 | int __weak hibernate_resume_nonboot_cpu_disable(void) |
420 | { | |
421 | return disable_nonboot_cpus(); | |
422 | } | |
423 | ||
72df68ca | 424 | /** |
f42a9813 RW |
425 | * resume_target_kernel - Restore system state from a hibernation image. |
426 | * @platform_mode: Whether or not to use the platform driver. | |
427 | * | |
cf579dfb RW |
428 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
429 | * contents of highmem that have not been restored yet from the image and run | |
430 | * the low-level code that will restore the remaining contents of memory and | |
431 | * switch to the just restored target kernel. | |
72df68ca | 432 | */ |
4aecd671 | 433 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
434 | { |
435 | int error; | |
436 | ||
cf579dfb | 437 | error = dpm_suspend_end(PMSG_QUIESCE); |
72df68ca | 438 | if (error) { |
2872de13 | 439 | pr_err("Some devices failed to power down, aborting resume\n"); |
32bdfac5 | 440 | return error; |
72df68ca | 441 | } |
2ed8d2b3 | 442 | |
4aecd671 RW |
443 | error = platform_pre_restore(platform_mode); |
444 | if (error) | |
445 | goto Cleanup; | |
446 | ||
406f992e | 447 | error = hibernate_resume_nonboot_cpu_disable(); |
4aecd671 RW |
448 | if (error) |
449 | goto Enable_cpus; | |
450 | ||
2ed8d2b3 RW |
451 | local_irq_disable(); |
452 | ||
2e711c04 | 453 | error = syscore_suspend(); |
4aecd671 RW |
454 | if (error) |
455 | goto Enable_irqs; | |
456 | ||
72df68ca RW |
457 | save_processor_state(); |
458 | error = restore_highmem(); | |
459 | if (!error) { | |
460 | error = swsusp_arch_resume(); | |
461 | /* | |
462 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
463 | * Otherwise, execution continues at the place where |
464 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
465 | */ |
466 | BUG_ON(!error); | |
4e2d9491 RW |
467 | /* |
468 | * This call to restore_highmem() reverts the changes made by | |
469 | * the previous one. | |
470 | */ | |
72df68ca RW |
471 | restore_highmem(); |
472 | } | |
473 | /* | |
474 | * The only reason why swsusp_arch_resume() can fail is memory being | |
475 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 476 | * subsequent failures. |
72df68ca RW |
477 | */ |
478 | swsusp_free(); | |
479 | restore_processor_state(); | |
480 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 481 | |
40dc166c | 482 | syscore_resume(); |
2ed8d2b3 | 483 | |
4aecd671 | 484 | Enable_irqs: |
72df68ca | 485 | local_irq_enable(); |
2ed8d2b3 | 486 | |
4aecd671 RW |
487 | Enable_cpus: |
488 | enable_nonboot_cpus(); | |
489 | ||
490 | Cleanup: | |
491 | platform_restore_cleanup(platform_mode); | |
492 | ||
cf579dfb | 493 | dpm_resume_start(PMSG_RECOVER); |
2ed8d2b3 | 494 | |
72df68ca RW |
495 | return error; |
496 | } | |
497 | ||
7777fab9 | 498 | /** |
f42a9813 RW |
499 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
500 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 501 | * |
f42a9813 | 502 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 503 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 504 | */ |
a634cc10 | 505 | int hibernation_restore(int platform_mode) |
7777fab9 | 506 | { |
cbe2f5a6 | 507 | int error; |
7777fab9 RW |
508 | |
509 | pm_prepare_console(); | |
510 | suspend_console(); | |
c9e664f1 | 511 | pm_restrict_gfp_mask(); |
d1616302 | 512 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 513 | if (!error) { |
4aecd671 | 514 | error = resume_target_kernel(platform_mode); |
94fb823f ID |
515 | /* |
516 | * The above should either succeed and jump to the new kernel, | |
517 | * or return with an error. Otherwise things are just | |
518 | * undefined, so let's be paranoid. | |
519 | */ | |
520 | BUG_ON(!error); | |
a634cc10 | 521 | } |
94fb823f | 522 | dpm_resume_end(PMSG_RECOVER); |
c9e664f1 | 523 | pm_restore_gfp_mask(); |
7777fab9 RW |
524 | resume_console(); |
525 | pm_restore_console(); | |
526 | return error; | |
527 | } | |
528 | ||
529 | /** | |
f42a9813 | 530 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 531 | */ |
7777fab9 RW |
532 | int hibernation_platform_enter(void) |
533 | { | |
cbe2f5a6 | 534 | int error; |
b1457bcc | 535 | |
9cd9a005 RW |
536 | if (!hibernation_ops) |
537 | return -ENOSYS; | |
538 | ||
539 | /* | |
540 | * We have cancelled the power transition by running | |
541 | * hibernation_ops->finish() before saving the image, so we should let | |
542 | * the firmware know that we're going to enter the sleep state after all | |
543 | */ | |
caea99ef | 544 | error = hibernation_ops->begin(); |
9cd9a005 | 545 | if (error) |
caea99ef | 546 | goto Close; |
9cd9a005 | 547 | |
abfe2d7b | 548 | entering_platform_hibernation = true; |
9cd9a005 | 549 | suspend_console(); |
d1616302 | 550 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
551 | if (error) { |
552 | if (hibernation_ops->recover) | |
553 | hibernation_ops->recover(); | |
554 | goto Resume_devices; | |
555 | } | |
9cd9a005 | 556 | |
cf579dfb | 557 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 558 | if (error) |
32bdfac5 | 559 | goto Resume_devices; |
4aecd671 | 560 | |
9cd9a005 RW |
561 | error = hibernation_ops->prepare(); |
562 | if (error) | |
e681c9dd | 563 | goto Platform_finish; |
9cd9a005 RW |
564 | |
565 | error = disable_nonboot_cpus(); | |
566 | if (error) | |
8c506608 | 567 | goto Enable_cpus; |
2ed8d2b3 | 568 | |
4aecd671 | 569 | local_irq_disable(); |
40dc166c | 570 | syscore_suspend(); |
a2867e08 | 571 | if (pm_wakeup_pending()) { |
c125e96f RW |
572 | error = -EAGAIN; |
573 | goto Power_up; | |
574 | } | |
575 | ||
4aecd671 RW |
576 | hibernation_ops->enter(); |
577 | /* We should never get here */ | |
578 | while (1); | |
9cd9a005 | 579 | |
c125e96f | 580 | Power_up: |
40dc166c | 581 | syscore_resume(); |
c125e96f | 582 | local_irq_enable(); |
8c506608 VK |
583 | |
584 | Enable_cpus: | |
c125e96f RW |
585 | enable_nonboot_cpus(); |
586 | ||
e681c9dd | 587 | Platform_finish: |
9cd9a005 | 588 | hibernation_ops->finish(); |
2ed8d2b3 | 589 | |
cf579dfb | 590 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 591 | |
9cd9a005 | 592 | Resume_devices: |
abfe2d7b | 593 | entering_platform_hibernation = false; |
d1616302 | 594 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 595 | resume_console(); |
2ed8d2b3 | 596 | |
caea99ef RW |
597 | Close: |
598 | hibernation_ops->end(); | |
2ed8d2b3 | 599 | |
b1457bcc | 600 | return error; |
7777fab9 RW |
601 | } |
602 | ||
1da177e4 | 603 | /** |
f42a9813 | 604 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 605 | * |
f42a9813 RW |
606 | * Use the platform driver, if configured, to put the system into the sleep |
607 | * state corresponding to hibernation, or try to power it off or reboot, | |
608 | * depending on the value of hibernation_mode. | |
1da177e4 | 609 | */ |
fe0c935a | 610 | static void power_down(void) |
1da177e4 | 611 | { |
62c552cc BS |
612 | #ifdef CONFIG_SUSPEND |
613 | int error; | |
81d45bdf RW |
614 | |
615 | if (hibernation_mode == HIBERNATION_SUSPEND) { | |
616 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
617 | if (error) { | |
618 | hibernation_mode = hibernation_ops ? | |
619 | HIBERNATION_PLATFORM : | |
620 | HIBERNATION_SHUTDOWN; | |
621 | } else { | |
622 | /* Restore swap signature. */ | |
623 | error = swsusp_unmark(); | |
624 | if (error) | |
2872de13 | 625 | pr_err("Swap will be unusable! Try swapon -a.\n"); |
81d45bdf RW |
626 | |
627 | return; | |
628 | } | |
629 | } | |
62c552cc BS |
630 | #endif |
631 | ||
a3d25c27 | 632 | switch (hibernation_mode) { |
a3d25c27 | 633 | case HIBERNATION_REBOOT: |
fdde86ac | 634 | kernel_restart(NULL); |
1da177e4 | 635 | break; |
a3d25c27 | 636 | case HIBERNATION_PLATFORM: |
7777fab9 | 637 | hibernation_platform_enter(); |
9cd9a005 | 638 | case HIBERNATION_SHUTDOWN: |
2c730785 SC |
639 | if (pm_power_off) |
640 | kernel_power_off(); | |
9cd9a005 | 641 | break; |
1da177e4 | 642 | } |
fdde86ac | 643 | kernel_halt(); |
fe0c935a JB |
644 | /* |
645 | * Valid image is on the disk, if we continue we risk serious data | |
646 | * corruption after resume. | |
647 | */ | |
2872de13 | 648 | pr_crit("Power down manually\n"); |
2c730785 SC |
649 | while (1) |
650 | cpu_relax(); | |
1da177e4 LT |
651 | } |
652 | ||
fe12c00d CY |
653 | static int load_image_and_restore(void) |
654 | { | |
655 | int error; | |
656 | unsigned int flags; | |
657 | ||
8d8b2441 | 658 | pm_pr_dbg("Loading hibernation image.\n"); |
fe12c00d CY |
659 | |
660 | lock_device_hotplug(); | |
661 | error = create_basic_memory_bitmaps(); | |
662 | if (error) | |
663 | goto Unlock; | |
664 | ||
665 | error = swsusp_read(&flags); | |
666 | swsusp_close(FMODE_READ); | |
667 | if (!error) | |
668 | hibernation_restore(flags & SF_PLATFORM_MODE); | |
669 | ||
2872de13 | 670 | pr_err("Failed to load hibernation image, recovering.\n"); |
fe12c00d CY |
671 | swsusp_free(); |
672 | free_basic_memory_bitmaps(); | |
673 | Unlock: | |
674 | unlock_device_hotplug(); | |
675 | ||
676 | return error; | |
677 | } | |
678 | ||
1da177e4 | 679 | /** |
f42a9813 | 680 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 681 | */ |
a3d25c27 | 682 | int hibernate(void) |
1da177e4 | 683 | { |
ea00f4f4 | 684 | int error, nr_calls = 0; |
fe12c00d | 685 | bool snapshot_test = false; |
1da177e4 | 686 | |
a6e15a39 | 687 | if (!hibernation_available()) { |
8d8b2441 | 688 | pm_pr_dbg("Hibernation not available.\n"); |
a6e15a39 KC |
689 | return -EPERM; |
690 | } | |
691 | ||
bcda53fa | 692 | lock_system_sleep(); |
0709db60 | 693 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
694 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
695 | error = -EBUSY; | |
696 | goto Unlock; | |
697 | } | |
698 | ||
8915aa20 | 699 | pr_info("hibernation entry\n"); |
5a0a2f30 | 700 | pm_prepare_console(); |
ea00f4f4 LW |
701 | error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); |
702 | if (error) { | |
703 | nr_calls--; | |
b10d9117 | 704 | goto Exit; |
ea00f4f4 | 705 | } |
0709db60 | 706 | |
2872de13 | 707 | pr_info("Syncing filesystems ... \n"); |
232b1432 | 708 | sys_sync(); |
2872de13 | 709 | pr_info("done.\n"); |
232b1432 | 710 | |
03afed8b | 711 | error = freeze_processes(); |
5a72e04d | 712 | if (error) |
8fd37a4c RW |
713 | goto Exit; |
714 | ||
942f4015 | 715 | lock_device_hotplug(); |
8fd37a4c RW |
716 | /* Allocate memory management structures */ |
717 | error = create_basic_memory_bitmaps(); | |
718 | if (error) | |
719 | goto Thaw; | |
1da177e4 | 720 | |
7777fab9 | 721 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 722 | if (error || freezer_test_done) |
8fd37a4c | 723 | goto Free_bitmaps; |
64a473cb RW |
724 | |
725 | if (in_suspend) { | |
a634cc10 RW |
726 | unsigned int flags = 0; |
727 | ||
728 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
729 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
730 | if (nocompress) |
731 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
732 | else |
733 | flags |= SF_CRC32_MODE; | |
734 | ||
8d8b2441 | 735 | pm_pr_dbg("Writing image.\n"); |
a634cc10 | 736 | error = swsusp_write(flags); |
7777fab9 | 737 | swsusp_free(); |
fe12c00d CY |
738 | if (!error) { |
739 | if (hibernation_mode == HIBERNATION_TEST_RESUME) | |
740 | snapshot_test = true; | |
741 | else | |
742 | power_down(); | |
743 | } | |
5262a475 | 744 | in_suspend = 0; |
c9e664f1 | 745 | pm_restore_gfp_mask(); |
b918f6e6 | 746 | } else { |
8d8b2441 | 747 | pm_pr_dbg("Image restored successfully.\n"); |
b918f6e6 | 748 | } |
64a473cb | 749 | |
8fd37a4c RW |
750 | Free_bitmaps: |
751 | free_basic_memory_bitmaps(); | |
b918f6e6 | 752 | Thaw: |
942f4015 | 753 | unlock_device_hotplug(); |
fe12c00d | 754 | if (snapshot_test) { |
8d8b2441 | 755 | pm_pr_dbg("Checking hibernation image\n"); |
fe12c00d CY |
756 | error = swsusp_check(); |
757 | if (!error) | |
758 | error = load_image_and_restore(); | |
759 | } | |
5a0a2f30 | 760 | thaw_processes(); |
a556d5b5 SB |
761 | |
762 | /* Don't bother checking whether freezer_test_done is true */ | |
763 | freezer_test_done = false; | |
0709db60 | 764 | Exit: |
ea00f4f4 | 765 | __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL); |
5a0a2f30 | 766 | pm_restore_console(); |
0709db60 | 767 | atomic_inc(&snapshot_device_available); |
b10d9117 | 768 | Unlock: |
bcda53fa | 769 | unlock_system_sleep(); |
8915aa20 RW |
770 | pr_info("hibernation exit\n"); |
771 | ||
1da177e4 LT |
772 | return error; |
773 | } | |
774 | ||
775 | ||
776 | /** | |
f42a9813 RW |
777 | * software_resume - Resume from a saved hibernation image. |
778 | * | |
779 | * This routine is called as a late initcall, when all devices have been | |
780 | * discovered and initialized already. | |
1da177e4 | 781 | * |
f42a9813 RW |
782 | * The image reading code is called to see if there is a hibernation image |
783 | * available for reading. If that is the case, devices are quiesced and the | |
784 | * contents of memory is restored from the saved image. | |
1da177e4 | 785 | * |
f42a9813 | 786 | * If this is successful, control reappears in the restored target kernel in |
d439e64f | 787 | * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine |
f42a9813 RW |
788 | * attempts to recover gracefully and make the kernel return to the normal mode |
789 | * of operation. | |
1da177e4 | 790 | */ |
1da177e4 LT |
791 | static int software_resume(void) |
792 | { | |
ea00f4f4 | 793 | int error, nr_calls = 0; |
1da177e4 | 794 | |
eed3ee08 AV |
795 | /* |
796 | * If the user said "noresume".. bail out early. | |
797 | */ | |
a6e15a39 | 798 | if (noresume || !hibernation_available()) |
eed3ee08 AV |
799 | return 0; |
800 | ||
60a0d233 JB |
801 | /* |
802 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
803 | * is configured into the kernel. Since the regular hibernate | |
804 | * trigger path is via sysfs which takes a buffer mutex before | |
805 | * calling hibernate functions (which take pm_mutex) this can | |
806 | * cause lockdep to complain about a possible ABBA deadlock | |
807 | * which cannot happen since we're in the boot code here and | |
808 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
809 | * here to avoid lockdep complaining. | |
810 | */ | |
811 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
812 | |
813 | if (swsusp_resume_device) | |
814 | goto Check_image; | |
815 | ||
816 | if (!strlen(resume_file)) { | |
817 | error = -ENOENT; | |
818 | goto Unlock; | |
819 | } | |
820 | ||
8d8b2441 | 821 | pm_pr_dbg("Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 822 | |
f126f733 | 823 | if (resume_delay) { |
2872de13 | 824 | pr_info("Waiting %dsec before reading resume device ...\n", |
f126f733 BS |
825 | resume_delay); |
826 | ssleep(resume_delay); | |
827 | } | |
828 | ||
0c8454f5 RW |
829 | /* Check if the device is there */ |
830 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
831 | |
832 | /* | |
833 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
834 | * integer format. (e.g. major:minor) | |
835 | */ | |
836 | if (isdigit(resume_file[0]) && resume_wait) { | |
837 | int partno; | |
838 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
839 | msleep(10); | |
840 | } | |
841 | ||
3efa147a | 842 | if (!swsusp_resume_device) { |
eed3ee08 AV |
843 | /* |
844 | * Some device discovery might still be in progress; we need | |
845 | * to wait for this to finish. | |
846 | */ | |
847 | wait_for_device_probe(); | |
6f8d7022 BS |
848 | |
849 | if (resume_wait) { | |
850 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
851 | msleep(10); | |
852 | async_synchronize_full(); | |
853 | } | |
854 | ||
3efa147a | 855 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
856 | if (!swsusp_resume_device) { |
857 | error = -ENODEV; | |
858 | goto Unlock; | |
859 | } | |
3efa147a PM |
860 | } |
861 | ||
0c8454f5 | 862 | Check_image: |
8d8b2441 | 863 | pm_pr_dbg("Hibernation image partition %d:%d present\n", |
0c8454f5 | 864 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 865 | |
8d8b2441 | 866 | pm_pr_dbg("Looking for hibernation image.\n"); |
ed746e3b RW |
867 | error = swsusp_check(); |
868 | if (error) | |
74dfd666 | 869 | goto Unlock; |
1da177e4 | 870 | |
0709db60 RW |
871 | /* The snapshot device should not be opened while we're running */ |
872 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
873 | error = -EBUSY; | |
76b57e61 | 874 | swsusp_close(FMODE_READ); |
0709db60 RW |
875 | goto Unlock; |
876 | } | |
877 | ||
8915aa20 | 878 | pr_info("resume from hibernation\n"); |
5a0a2f30 | 879 | pm_prepare_console(); |
ea00f4f4 LW |
880 | error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); |
881 | if (error) { | |
882 | nr_calls--; | |
8fd37a4c | 883 | goto Close_Finish; |
ea00f4f4 | 884 | } |
1bfcf130 | 885 | |
8d8b2441 | 886 | pm_pr_dbg("Preparing processes for restore.\n"); |
03afed8b | 887 | error = freeze_processes(); |
8fd37a4c RW |
888 | if (error) |
889 | goto Close_Finish; | |
fe12c00d | 890 | error = load_image_and_restore(); |
8fd37a4c | 891 | thaw_processes(); |
0709db60 | 892 | Finish: |
ea00f4f4 | 893 | __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); |
5a0a2f30 | 894 | pm_restore_console(); |
8915aa20 | 895 | pr_info("resume from hibernation failed (%d)\n", error); |
0709db60 | 896 | atomic_inc(&snapshot_device_available); |
dd5d666b | 897 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 898 | Unlock: |
a6d70980 | 899 | mutex_unlock(&pm_mutex); |
8d8b2441 | 900 | pm_pr_dbg("Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 901 | return error; |
8fd37a4c | 902 | Close_Finish: |
76b57e61 JS |
903 | swsusp_close(FMODE_READ); |
904 | goto Finish; | |
1da177e4 LT |
905 | } |
906 | ||
d3c345db | 907 | late_initcall_sync(software_resume); |
1da177e4 LT |
908 | |
909 | ||
a3d25c27 RW |
910 | static const char * const hibernation_modes[] = { |
911 | [HIBERNATION_PLATFORM] = "platform", | |
912 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
913 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
914 | #ifdef CONFIG_SUSPEND |
915 | [HIBERNATION_SUSPEND] = "suspend", | |
916 | #endif | |
fe12c00d | 917 | [HIBERNATION_TEST_RESUME] = "test_resume", |
1da177e4 LT |
918 | }; |
919 | ||
f42a9813 RW |
920 | /* |
921 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 922 | * |
f42a9813 RW |
923 | * Hibernation can be handled in several ways. There are a few different ways |
924 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
925 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 926 | * mostly). |
1da177e4 | 927 | * |
f42a9813 RW |
928 | * The sysfs file /sys/power/disk provides an interface for selecting the |
929 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 930 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 931 | * |
1da177e4 LT |
932 | * 'platform' |
933 | * 'shutdown' | |
934 | * 'reboot' | |
935 | * | |
f42a9813 RW |
936 | * If a platform hibernation driver is in use, 'platform' will be supported |
937 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
938 | * The selected option (i.e. the one corresponding to the current value of | |
939 | * hibernation_mode) is enclosed by a square bracket. | |
940 | * | |
941 | * To select a given hibernation mode it is necessary to write the mode's | |
942 | * string representation (as returned by reading from /sys/power/disk) back | |
943 | * into /sys/power/disk. | |
1da177e4 LT |
944 | */ |
945 | ||
386f275f KS |
946 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
947 | char *buf) | |
1da177e4 | 948 | { |
f0ced9b2 JB |
949 | int i; |
950 | char *start = buf; | |
951 | ||
a6e15a39 KC |
952 | if (!hibernation_available()) |
953 | return sprintf(buf, "[disabled]\n"); | |
954 | ||
a3d25c27 RW |
955 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
956 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
957 | continue; |
958 | switch (i) { | |
a3d25c27 RW |
959 | case HIBERNATION_SHUTDOWN: |
960 | case HIBERNATION_REBOOT: | |
62c552cc BS |
961 | #ifdef CONFIG_SUSPEND |
962 | case HIBERNATION_SUSPEND: | |
963 | #endif | |
fe12c00d | 964 | case HIBERNATION_TEST_RESUME: |
f0ced9b2 | 965 | break; |
a3d25c27 RW |
966 | case HIBERNATION_PLATFORM: |
967 | if (hibernation_ops) | |
f0ced9b2 JB |
968 | break; |
969 | /* not a valid mode, continue with loop */ | |
970 | continue; | |
971 | } | |
a3d25c27 RW |
972 | if (i == hibernation_mode) |
973 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 974 | else |
a3d25c27 | 975 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
976 | } |
977 | buf += sprintf(buf, "\n"); | |
978 | return buf-start; | |
1da177e4 LT |
979 | } |
980 | ||
386f275f KS |
981 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
982 | const char *buf, size_t n) | |
1da177e4 LT |
983 | { |
984 | int error = 0; | |
985 | int i; | |
986 | int len; | |
987 | char *p; | |
a3d25c27 | 988 | int mode = HIBERNATION_INVALID; |
1da177e4 | 989 | |
a6e15a39 KC |
990 | if (!hibernation_available()) |
991 | return -EPERM; | |
992 | ||
1da177e4 LT |
993 | p = memchr(buf, '\n', n); |
994 | len = p ? p - buf : n; | |
995 | ||
bcda53fa | 996 | lock_system_sleep(); |
a3d25c27 | 997 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
998 | if (len == strlen(hibernation_modes[i]) |
999 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
1000 | mode = i; |
1001 | break; | |
1002 | } | |
1003 | } | |
a3d25c27 | 1004 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 1005 | switch (mode) { |
a3d25c27 RW |
1006 | case HIBERNATION_SHUTDOWN: |
1007 | case HIBERNATION_REBOOT: | |
62c552cc BS |
1008 | #ifdef CONFIG_SUSPEND |
1009 | case HIBERNATION_SUSPEND: | |
1010 | #endif | |
fe12c00d | 1011 | case HIBERNATION_TEST_RESUME: |
a3d25c27 | 1012 | hibernation_mode = mode; |
fe0c935a | 1013 | break; |
a3d25c27 RW |
1014 | case HIBERNATION_PLATFORM: |
1015 | if (hibernation_ops) | |
1016 | hibernation_mode = mode; | |
1da177e4 LT |
1017 | else |
1018 | error = -EINVAL; | |
1019 | } | |
a3d25c27 | 1020 | } else |
1da177e4 LT |
1021 | error = -EINVAL; |
1022 | ||
a3d25c27 | 1023 | if (!error) |
8d8b2441 RW |
1024 | pm_pr_dbg("Hibernation mode set to '%s'\n", |
1025 | hibernation_modes[mode]); | |
bcda53fa | 1026 | unlock_system_sleep(); |
1da177e4 LT |
1027 | return error ? error : n; |
1028 | } | |
1029 | ||
1030 | power_attr(disk); | |
1031 | ||
386f275f KS |
1032 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
1033 | char *buf) | |
1da177e4 LT |
1034 | { |
1035 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
1036 | MINOR(swsusp_resume_device)); | |
1037 | } | |
1038 | ||
386f275f KS |
1039 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
1040 | const char *buf, size_t n) | |
1da177e4 | 1041 | { |
1da177e4 | 1042 | dev_t res; |
421a5fa1 SC |
1043 | int len = n; |
1044 | char *name; | |
1da177e4 | 1045 | |
421a5fa1 SC |
1046 | if (len && buf[len-1] == '\n') |
1047 | len--; | |
1048 | name = kstrndup(buf, len, GFP_KERNEL); | |
1049 | if (!name) | |
1050 | return -ENOMEM; | |
1da177e4 | 1051 | |
421a5fa1 SC |
1052 | res = name_to_dev_t(name); |
1053 | kfree(name); | |
1054 | if (!res) | |
1055 | return -EINVAL; | |
1da177e4 | 1056 | |
bcda53fa | 1057 | lock_system_sleep(); |
a576219a | 1058 | swsusp_resume_device = res; |
bcda53fa | 1059 | unlock_system_sleep(); |
2872de13 | 1060 | pr_info("Starting manual resume from disk\n"); |
a576219a AM |
1061 | noresume = 0; |
1062 | software_resume(); | |
421a5fa1 | 1063 | return n; |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | power_attr(resume); | |
1067 | ||
386f275f KS |
1068 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1069 | char *buf) | |
ca0aec0f | 1070 | { |
853609b6 | 1071 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1072 | } |
1073 | ||
386f275f KS |
1074 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1075 | const char *buf, size_t n) | |
ca0aec0f | 1076 | { |
853609b6 | 1077 | unsigned long size; |
ca0aec0f | 1078 | |
853609b6 | 1079 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1080 | image_size = size; |
1081 | return n; | |
1082 | } | |
1083 | ||
1084 | return -EINVAL; | |
1085 | } | |
1086 | ||
1087 | power_attr(image_size); | |
1088 | ||
ddeb6487 RW |
1089 | static ssize_t reserved_size_show(struct kobject *kobj, |
1090 | struct kobj_attribute *attr, char *buf) | |
1091 | { | |
1092 | return sprintf(buf, "%lu\n", reserved_size); | |
1093 | } | |
1094 | ||
1095 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1096 | struct kobj_attribute *attr, | |
1097 | const char *buf, size_t n) | |
1098 | { | |
1099 | unsigned long size; | |
1100 | ||
1101 | if (sscanf(buf, "%lu", &size) == 1) { | |
1102 | reserved_size = size; | |
1103 | return n; | |
1104 | } | |
1105 | ||
1106 | return -EINVAL; | |
1107 | } | |
1108 | ||
1109 | power_attr(reserved_size); | |
1110 | ||
1da177e4 LT |
1111 | static struct attribute * g[] = { |
1112 | &disk_attr.attr, | |
1113 | &resume_attr.attr, | |
ca0aec0f | 1114 | &image_size_attr.attr, |
ddeb6487 | 1115 | &reserved_size_attr.attr, |
1da177e4 LT |
1116 | NULL, |
1117 | }; | |
1118 | ||
1119 | ||
59494fe2 | 1120 | static const struct attribute_group attr_group = { |
1da177e4 LT |
1121 | .attrs = g, |
1122 | }; | |
1123 | ||
1124 | ||
1125 | static int __init pm_disk_init(void) | |
1126 | { | |
d76e15fb | 1127 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | core_initcall(pm_disk_init); | |
1131 | ||
1132 | ||
1133 | static int __init resume_setup(char *str) | |
1134 | { | |
1135 | if (noresume) | |
1136 | return 1; | |
1137 | ||
1138 | strncpy( resume_file, str, 255 ); | |
1139 | return 1; | |
1140 | } | |
1141 | ||
9a154d9d RW |
1142 | static int __init resume_offset_setup(char *str) |
1143 | { | |
1144 | unsigned long long offset; | |
1145 | ||
1146 | if (noresume) | |
1147 | return 1; | |
1148 | ||
1149 | if (sscanf(str, "%llu", &offset) == 1) | |
1150 | swsusp_resume_block = offset; | |
1151 | ||
1152 | return 1; | |
1153 | } | |
1154 | ||
f996fc96 BS |
1155 | static int __init hibernate_setup(char *str) |
1156 | { | |
2f88e41a | 1157 | if (!strncmp(str, "noresume", 8)) { |
f996fc96 | 1158 | noresume = 1; |
2f88e41a | 1159 | } else if (!strncmp(str, "nocompress", 10)) { |
f996fc96 | 1160 | nocompress = 1; |
2f88e41a | 1161 | } else if (!strncmp(str, "no", 2)) { |
a6e15a39 KC |
1162 | noresume = 1; |
1163 | nohibernate = 1; | |
0f5bf6d0 | 1164 | } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) |
4c0b6c10 RW |
1165 | && !strncmp(str, "protect_image", 13)) { |
1166 | enable_restore_image_protection(); | |
a6e15a39 | 1167 | } |
f996fc96 BS |
1168 | return 1; |
1169 | } | |
1170 | ||
1da177e4 LT |
1171 | static int __init noresume_setup(char *str) |
1172 | { | |
1173 | noresume = 1; | |
1174 | return 1; | |
1175 | } | |
1176 | ||
6f8d7022 BS |
1177 | static int __init resumewait_setup(char *str) |
1178 | { | |
1179 | resume_wait = 1; | |
1180 | return 1; | |
1181 | } | |
1182 | ||
f126f733 BS |
1183 | static int __init resumedelay_setup(char *str) |
1184 | { | |
f6514be5 | 1185 | int rc = kstrtouint(str, 0, &resume_delay); |
317cf7e5 FF |
1186 | |
1187 | if (rc) | |
1188 | return rc; | |
f126f733 BS |
1189 | return 1; |
1190 | } | |
1191 | ||
a6e15a39 KC |
1192 | static int __init nohibernate_setup(char *str) |
1193 | { | |
1194 | noresume = 1; | |
1195 | nohibernate = 1; | |
1196 | return 1; | |
1197 | } | |
1198 | ||
1da177e4 | 1199 | __setup("noresume", noresume_setup); |
9a154d9d | 1200 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1201 | __setup("resume=", resume_setup); |
f996fc96 | 1202 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1203 | __setup("resumewait", resumewait_setup); |
f126f733 | 1204 | __setup("resumedelay=", resumedelay_setup); |
a6e15a39 | 1205 | __setup("nohibernate", nohibernate_setup); |