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> | |
bb3632c6 | 31 | #include <trace/events/power.h> |
d53d9f16 | 32 | |
1da177e4 LT |
33 | #include "power.h" |
34 | ||
35 | ||
d231ff1a BS |
36 | static int nocompress; |
37 | static int noresume; | |
38 | static int resume_wait; | |
f6514be5 | 39 | static unsigned int resume_delay; |
47a460d5 | 40 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 41 | dev_t swsusp_resume_device; |
9a154d9d | 42 | sector_t swsusp_resume_block; |
d6efc2f7 | 43 | __visible int in_suspend __nosavedata; |
1da177e4 | 44 | |
a3d25c27 RW |
45 | enum { |
46 | HIBERNATION_INVALID, | |
47 | HIBERNATION_PLATFORM, | |
a3d25c27 RW |
48 | HIBERNATION_SHUTDOWN, |
49 | HIBERNATION_REBOOT, | |
62c552cc BS |
50 | #ifdef CONFIG_SUSPEND |
51 | HIBERNATION_SUSPEND, | |
52 | #endif | |
a3d25c27 RW |
53 | /* keep last */ |
54 | __HIBERNATION_AFTER_LAST | |
55 | }; | |
56 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
57 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
58 | ||
59 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
60 | ||
97819a26 | 61 | bool freezer_test_done; |
aa9a7b11 | 62 | |
073ef1f6 | 63 | static const struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
64 | |
65 | /** | |
f42a9813 RW |
66 | * hibernation_set_ops - Set the global hibernate operations. |
67 | * @ops: Hibernation operations to use in subsequent hibernation transitions. | |
a3d25c27 | 68 | */ |
073ef1f6 | 69 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
a3d25c27 | 70 | { |
caea99ef RW |
71 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
72 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
5729c63a | 73 | && ops->restore_cleanup && ops->leave)) { |
a3d25c27 RW |
74 | WARN_ON(1); |
75 | return; | |
76 | } | |
bcda53fa | 77 | lock_system_sleep(); |
a3d25c27 RW |
78 | hibernation_ops = ops; |
79 | if (ops) | |
80 | hibernation_mode = HIBERNATION_PLATFORM; | |
81 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
82 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
83 | ||
bcda53fa | 84 | unlock_system_sleep(); |
a3d25c27 | 85 | } |
e0c7855e | 86 | EXPORT_SYMBOL_GPL(hibernation_set_ops); |
a3d25c27 | 87 | |
abfe2d7b RW |
88 | static bool entering_platform_hibernation; |
89 | ||
90 | bool system_entering_hibernation(void) | |
91 | { | |
92 | return entering_platform_hibernation; | |
93 | } | |
94 | EXPORT_SYMBOL(system_entering_hibernation); | |
95 | ||
4cc79776 RW |
96 | #ifdef CONFIG_PM_DEBUG |
97 | static void hibernation_debug_sleep(void) | |
98 | { | |
99 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
100 | mdelay(5000); | |
101 | } | |
102 | ||
4cc79776 RW |
103 | static int hibernation_test(int level) |
104 | { | |
105 | if (pm_test_level == level) { | |
106 | hibernation_debug_sleep(); | |
107 | return 1; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | #else /* !CONFIG_PM_DEBUG */ | |
4cc79776 RW |
112 | static int hibernation_test(int level) { return 0; } |
113 | #endif /* !CONFIG_PM_DEBUG */ | |
114 | ||
74f270af | 115 | /** |
f42a9813 RW |
116 | * platform_begin - Call platform to start hibernation. |
117 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 118 | */ |
caea99ef | 119 | static int platform_begin(int platform_mode) |
74f270af RW |
120 | { |
121 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
122 | hibernation_ops->begin() : 0; |
123 | } | |
124 | ||
125 | /** | |
f42a9813 RW |
126 | * platform_end - Call platform to finish transition to the working state. |
127 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 128 | */ |
caea99ef RW |
129 | static void platform_end(int platform_mode) |
130 | { | |
131 | if (platform_mode && hibernation_ops) | |
132 | hibernation_ops->end(); | |
74f270af | 133 | } |
a3d25c27 | 134 | |
8a05aac2 | 135 | /** |
f42a9813 RW |
136 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
137 | * @platform_mode: Whether or not to use the platform driver. | |
138 | * | |
139 | * Use the platform driver to prepare the system for creating a hibernate image, | |
140 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
141 | */ |
142 | ||
74f270af | 143 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 144 | { |
7777fab9 | 145 | return (platform_mode && hibernation_ops) ? |
74f270af | 146 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 147 | } |
8a05aac2 | 148 | |
c7e0831d | 149 | /** |
f42a9813 RW |
150 | * platform_leave - Call platform to prepare a transition to the working state. |
151 | * @platform_mode: Whether or not to use the platform driver. | |
152 | * | |
153 | * Use the platform driver prepare to prepare the machine for switching to the | |
154 | * normal mode of operation. | |
155 | * | |
156 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 157 | */ |
c7e0831d RW |
158 | static void platform_leave(int platform_mode) |
159 | { | |
160 | if (platform_mode && hibernation_ops) | |
161 | hibernation_ops->leave(); | |
162 | } | |
163 | ||
a3d25c27 | 164 | /** |
f42a9813 RW |
165 | * platform_finish - Call platform to switch the system to the working state. |
166 | * @platform_mode: Whether or not to use the platform driver. | |
167 | * | |
168 | * Use the platform driver to switch the machine to the normal mode of | |
169 | * operation. | |
170 | * | |
171 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 172 | */ |
7777fab9 | 173 | static void platform_finish(int platform_mode) |
a3d25c27 | 174 | { |
7777fab9 | 175 | if (platform_mode && hibernation_ops) |
a3d25c27 | 176 | hibernation_ops->finish(); |
8a05aac2 SS |
177 | } |
178 | ||
a634cc10 | 179 | /** |
f42a9813 RW |
180 | * platform_pre_restore - Prepare for hibernate image restoration. |
181 | * @platform_mode: Whether or not to use the platform driver. | |
182 | * | |
183 | * Use the platform driver to prepare the system for resume from a hibernation | |
184 | * image. | |
185 | * | |
186 | * If the restore fails after this function has been called, | |
187 | * platform_restore_cleanup() must be called. | |
a634cc10 | 188 | */ |
a634cc10 RW |
189 | static int platform_pre_restore(int platform_mode) |
190 | { | |
191 | return (platform_mode && hibernation_ops) ? | |
192 | hibernation_ops->pre_restore() : 0; | |
193 | } | |
194 | ||
195 | /** | |
f42a9813 RW |
196 | * platform_restore_cleanup - Switch to the working state after failing restore. |
197 | * @platform_mode: Whether or not to use the platform driver. | |
198 | * | |
199 | * Use the platform driver to switch the system to the normal mode of operation | |
200 | * after a failing restore. | |
201 | * | |
202 | * If platform_pre_restore() has been called before the failing restore, this | |
203 | * function must be called too, regardless of the result of | |
204 | * platform_pre_restore(). | |
a634cc10 | 205 | */ |
a634cc10 RW |
206 | static void platform_restore_cleanup(int platform_mode) |
207 | { | |
208 | if (platform_mode && hibernation_ops) | |
209 | hibernation_ops->restore_cleanup(); | |
210 | } | |
211 | ||
d8f3de0d | 212 | /** |
f42a9813 RW |
213 | * platform_recover - Recover from a failure to suspend devices. |
214 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 215 | */ |
d8f3de0d RW |
216 | static void platform_recover(int platform_mode) |
217 | { | |
218 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
219 | hibernation_ops->recover(); | |
220 | } | |
221 | ||
8e60c6a1 | 222 | /** |
f42a9813 RW |
223 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
224 | * @start: Starting event. | |
225 | * @stop: Final event. | |
226 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
227 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 228 | */ |
8e60c6a1 NC |
229 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
230 | unsigned nr_pages, char *msg) | |
231 | { | |
4881f603 CG |
232 | u64 elapsed_centisecs64; |
233 | unsigned int centisecs; | |
234 | unsigned int k; | |
235 | unsigned int kps; | |
8e60c6a1 NC |
236 | |
237 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
4881f603 CG |
238 | /* |
239 | * If "(s64)elapsed_centisecs64 < 0", it will print long elapsed time, | |
240 | * it is obvious enough for what went wrong. | |
241 | */ | |
8e60c6a1 NC |
242 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); |
243 | centisecs = elapsed_centisecs64; | |
244 | if (centisecs == 0) | |
245 | centisecs = 1; /* avoid div-by-zero */ | |
246 | k = nr_pages * (PAGE_SIZE / 1024); | |
247 | kps = (k * 100) / centisecs; | |
4881f603 | 248 | printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n", |
8e60c6a1 NC |
249 | msg, k, |
250 | centisecs / 100, centisecs % 100, | |
251 | kps / 1000, (kps % 1000) / 10); | |
252 | } | |
253 | ||
c7e0831d | 254 | /** |
f42a9813 RW |
255 | * create_image - Create a hibernation image. |
256 | * @platform_mode: Whether or not to use the platform driver. | |
257 | * | |
cf579dfb RW |
258 | * Execute device drivers' "late" and "noirq" freeze callbacks, create a |
259 | * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. | |
f42a9813 RW |
260 | * |
261 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 262 | */ |
47a460d5 | 263 | static int create_image(int platform_mode) |
c7e0831d RW |
264 | { |
265 | int error; | |
266 | ||
cf579dfb | 267 | error = dpm_suspend_end(PMSG_FREEZE); |
c7e0831d | 268 | if (error) { |
23976728 RW |
269 | printk(KERN_ERR "PM: Some devices failed to power down, " |
270 | "aborting hibernation\n"); | |
32bdfac5 | 271 | return error; |
c7e0831d | 272 | } |
2ed8d2b3 | 273 | |
4aecd671 RW |
274 | error = platform_pre_snapshot(platform_mode); |
275 | if (error || hibernation_test(TEST_PLATFORM)) | |
276 | goto Platform_finish; | |
277 | ||
278 | error = disable_nonboot_cpus(); | |
48580ab8 | 279 | if (error || hibernation_test(TEST_CPUS)) |
4aecd671 RW |
280 | goto Enable_cpus; |
281 | ||
2ed8d2b3 RW |
282 | local_irq_disable(); |
283 | ||
2e711c04 | 284 | error = syscore_suspend(); |
770824bd | 285 | if (error) { |
4484079d | 286 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 287 | "aborting hibernation\n"); |
4aecd671 | 288 | goto Enable_irqs; |
770824bd | 289 | } |
c7e0831d | 290 | |
a2867e08 | 291 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
292 | goto Power_up; |
293 | ||
294 | in_suspend = 1; | |
c7e0831d | 295 | save_processor_state(); |
bb3632c6 | 296 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true); |
c7e0831d | 297 | error = swsusp_arch_suspend(); |
bb3632c6 | 298 | trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false); |
c7e0831d | 299 | if (error) |
23976728 RW |
300 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
301 | error); | |
c7e0831d RW |
302 | /* Restore control flow magically appears here */ |
303 | restore_processor_state(); | |
362e77d1 | 304 | if (!in_suspend) |
c125e96f | 305 | events_check_enabled = false; |
362e77d1 BM |
306 | |
307 | platform_leave(platform_mode); | |
4aecd671 | 308 | |
4cc79776 | 309 | Power_up: |
40dc166c | 310 | syscore_resume(); |
2ed8d2b3 | 311 | |
4aecd671 | 312 | Enable_irqs: |
2ed8d2b3 RW |
313 | local_irq_enable(); |
314 | ||
4aecd671 RW |
315 | Enable_cpus: |
316 | enable_nonboot_cpus(); | |
317 | ||
318 | Platform_finish: | |
319 | platform_finish(platform_mode); | |
320 | ||
cf579dfb | 321 | dpm_resume_start(in_suspend ? |
1eede070 | 322 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 323 | |
c7e0831d RW |
324 | return error; |
325 | } | |
326 | ||
7777fab9 | 327 | /** |
f42a9813 RW |
328 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
329 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 330 | * |
f42a9813 | 331 | * This routine must be called with pm_mutex held. |
7777fab9 | 332 | */ |
7777fab9 RW |
333 | int hibernation_snapshot(int platform_mode) |
334 | { | |
953a2063 | 335 | pm_message_t msg; |
cbe2f5a6 | 336 | int error; |
7777fab9 | 337 | |
3fe0313e | 338 | error = platform_begin(platform_mode); |
7777fab9 | 339 | if (error) |
d074ee02 | 340 | goto Close; |
7777fab9 | 341 | |
64a473cb RW |
342 | /* Preallocate image memory before shutting down devices. */ |
343 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
344 | if (error) |
345 | goto Close; | |
346 | ||
347 | error = freeze_kernel_threads(); | |
348 | if (error) | |
bb58dd5d | 349 | goto Cleanup; |
2aede851 | 350 | |
48580ab8 | 351 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
352 | |
353 | /* | |
354 | * Indicate to the caller that we are returning due to a | |
355 | * successful freezer test. | |
356 | */ | |
357 | freezer_test_done = true; | |
51d6ff7a | 358 | goto Thaw; |
aa9a7b11 SB |
359 | } |
360 | ||
2aede851 | 361 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 362 | if (error) { |
953a2063 | 363 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 364 | goto Thaw; |
bb58dd5d | 365 | } |
74f270af | 366 | |
7777fab9 | 367 | suspend_console(); |
443772d4 | 368 | ftrace_stop(); |
c9e664f1 | 369 | pm_restrict_gfp_mask(); |
953a2063 | 370 | |
91e7c75b | 371 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 372 | |
953a2063 SB |
373 | if (error || hibernation_test(TEST_DEVICES)) |
374 | platform_recover(platform_mode); | |
375 | else | |
376 | error = create_image(platform_mode); | |
7777fab9 | 377 | |
c9e664f1 | 378 | /* |
953a2063 SB |
379 | * In the case that we call create_image() above, the control |
380 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
381 | * image creation has failed and (2) after a successful restore. |
382 | */ | |
4cc79776 | 383 | |
64a473cb RW |
384 | /* We may need to release the preallocated image pages here. */ |
385 | if (error || !in_suspend) | |
386 | swsusp_free(); | |
387 | ||
91e7c75b RW |
388 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
389 | dpm_resume(msg); | |
c9e664f1 RW |
390 | |
391 | if (error || !in_suspend) | |
392 | pm_restore_gfp_mask(); | |
393 | ||
443772d4 | 394 | ftrace_start(); |
7777fab9 | 395 | resume_console(); |
91e7c75b RW |
396 | dpm_complete(msg); |
397 | ||
caea99ef RW |
398 | Close: |
399 | platform_end(platform_mode); | |
7777fab9 | 400 | return error; |
d8f3de0d | 401 | |
51d6ff7a SB |
402 | Thaw: |
403 | thaw_kernel_threads(); | |
bb58dd5d RW |
404 | Cleanup: |
405 | swsusp_free(); | |
406 | goto Close; | |
7777fab9 RW |
407 | } |
408 | ||
72df68ca | 409 | /** |
f42a9813 RW |
410 | * resume_target_kernel - Restore system state from a hibernation image. |
411 | * @platform_mode: Whether or not to use the platform driver. | |
412 | * | |
cf579dfb RW |
413 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
414 | * contents of highmem that have not been restored yet from the image and run | |
415 | * the low-level code that will restore the remaining contents of memory and | |
416 | * switch to the just restored target kernel. | |
72df68ca | 417 | */ |
4aecd671 | 418 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
419 | { |
420 | int error; | |
421 | ||
cf579dfb | 422 | error = dpm_suspend_end(PMSG_QUIESCE); |
72df68ca | 423 | if (error) { |
23976728 | 424 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 425 | "aborting resume\n"); |
32bdfac5 | 426 | return error; |
72df68ca | 427 | } |
2ed8d2b3 | 428 | |
4aecd671 RW |
429 | error = platform_pre_restore(platform_mode); |
430 | if (error) | |
431 | goto Cleanup; | |
432 | ||
433 | error = disable_nonboot_cpus(); | |
434 | if (error) | |
435 | goto Enable_cpus; | |
436 | ||
2ed8d2b3 RW |
437 | local_irq_disable(); |
438 | ||
2e711c04 | 439 | error = syscore_suspend(); |
4aecd671 RW |
440 | if (error) |
441 | goto Enable_irqs; | |
442 | ||
72df68ca RW |
443 | save_processor_state(); |
444 | error = restore_highmem(); | |
445 | if (!error) { | |
446 | error = swsusp_arch_resume(); | |
447 | /* | |
448 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
449 | * Otherwise, execution continues at the place where |
450 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
451 | */ |
452 | BUG_ON(!error); | |
4e2d9491 RW |
453 | /* |
454 | * This call to restore_highmem() reverts the changes made by | |
455 | * the previous one. | |
456 | */ | |
72df68ca RW |
457 | restore_highmem(); |
458 | } | |
459 | /* | |
460 | * The only reason why swsusp_arch_resume() can fail is memory being | |
461 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 462 | * subsequent failures. |
72df68ca RW |
463 | */ |
464 | swsusp_free(); | |
465 | restore_processor_state(); | |
466 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 467 | |
40dc166c | 468 | syscore_resume(); |
2ed8d2b3 | 469 | |
4aecd671 | 470 | Enable_irqs: |
72df68ca | 471 | local_irq_enable(); |
2ed8d2b3 | 472 | |
4aecd671 RW |
473 | Enable_cpus: |
474 | enable_nonboot_cpus(); | |
475 | ||
476 | Cleanup: | |
477 | platform_restore_cleanup(platform_mode); | |
478 | ||
cf579dfb | 479 | dpm_resume_start(PMSG_RECOVER); |
2ed8d2b3 | 480 | |
72df68ca RW |
481 | return error; |
482 | } | |
483 | ||
7777fab9 | 484 | /** |
f42a9813 RW |
485 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
486 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 487 | * |
f42a9813 | 488 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 489 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 490 | */ |
a634cc10 | 491 | int hibernation_restore(int platform_mode) |
7777fab9 | 492 | { |
cbe2f5a6 | 493 | int error; |
7777fab9 RW |
494 | |
495 | pm_prepare_console(); | |
496 | suspend_console(); | |
443772d4 | 497 | ftrace_stop(); |
c9e664f1 | 498 | pm_restrict_gfp_mask(); |
d1616302 | 499 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 500 | if (!error) { |
4aecd671 | 501 | error = resume_target_kernel(platform_mode); |
d1616302 | 502 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 503 | } |
c9e664f1 | 504 | pm_restore_gfp_mask(); |
443772d4 | 505 | ftrace_start(); |
7777fab9 RW |
506 | resume_console(); |
507 | pm_restore_console(); | |
508 | return error; | |
509 | } | |
510 | ||
511 | /** | |
f42a9813 | 512 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 513 | */ |
7777fab9 RW |
514 | int hibernation_platform_enter(void) |
515 | { | |
cbe2f5a6 | 516 | int error; |
b1457bcc | 517 | |
9cd9a005 RW |
518 | if (!hibernation_ops) |
519 | return -ENOSYS; | |
520 | ||
521 | /* | |
522 | * We have cancelled the power transition by running | |
523 | * hibernation_ops->finish() before saving the image, so we should let | |
524 | * the firmware know that we're going to enter the sleep state after all | |
525 | */ | |
caea99ef | 526 | error = hibernation_ops->begin(); |
9cd9a005 | 527 | if (error) |
caea99ef | 528 | goto Close; |
9cd9a005 | 529 | |
abfe2d7b | 530 | entering_platform_hibernation = true; |
9cd9a005 | 531 | suspend_console(); |
443772d4 | 532 | ftrace_stop(); |
d1616302 | 533 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
534 | if (error) { |
535 | if (hibernation_ops->recover) | |
536 | hibernation_ops->recover(); | |
537 | goto Resume_devices; | |
538 | } | |
9cd9a005 | 539 | |
cf579dfb | 540 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 541 | if (error) |
32bdfac5 | 542 | goto Resume_devices; |
4aecd671 | 543 | |
9cd9a005 RW |
544 | error = hibernation_ops->prepare(); |
545 | if (error) | |
e681c9dd | 546 | goto Platform_finish; |
9cd9a005 RW |
547 | |
548 | error = disable_nonboot_cpus(); | |
549 | if (error) | |
e681c9dd | 550 | goto Platform_finish; |
2ed8d2b3 | 551 | |
4aecd671 | 552 | local_irq_disable(); |
40dc166c | 553 | syscore_suspend(); |
a2867e08 | 554 | if (pm_wakeup_pending()) { |
c125e96f RW |
555 | error = -EAGAIN; |
556 | goto Power_up; | |
557 | } | |
558 | ||
4aecd671 RW |
559 | hibernation_ops->enter(); |
560 | /* We should never get here */ | |
561 | while (1); | |
9cd9a005 | 562 | |
c125e96f | 563 | Power_up: |
40dc166c | 564 | syscore_resume(); |
c125e96f RW |
565 | local_irq_enable(); |
566 | enable_nonboot_cpus(); | |
567 | ||
e681c9dd | 568 | Platform_finish: |
9cd9a005 | 569 | hibernation_ops->finish(); |
2ed8d2b3 | 570 | |
cf579dfb | 571 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 572 | |
9cd9a005 | 573 | Resume_devices: |
abfe2d7b | 574 | entering_platform_hibernation = false; |
d1616302 | 575 | dpm_resume_end(PMSG_RESTORE); |
443772d4 | 576 | ftrace_start(); |
9cd9a005 | 577 | resume_console(); |
2ed8d2b3 | 578 | |
caea99ef RW |
579 | Close: |
580 | hibernation_ops->end(); | |
2ed8d2b3 | 581 | |
b1457bcc | 582 | return error; |
7777fab9 RW |
583 | } |
584 | ||
1da177e4 | 585 | /** |
f42a9813 | 586 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 587 | * |
f42a9813 RW |
588 | * Use the platform driver, if configured, to put the system into the sleep |
589 | * state corresponding to hibernation, or try to power it off or reboot, | |
590 | * depending on the value of hibernation_mode. | |
1da177e4 | 591 | */ |
fe0c935a | 592 | static void power_down(void) |
1da177e4 | 593 | { |
62c552cc BS |
594 | #ifdef CONFIG_SUSPEND |
595 | int error; | |
596 | #endif | |
597 | ||
a3d25c27 | 598 | switch (hibernation_mode) { |
a3d25c27 | 599 | case HIBERNATION_REBOOT: |
fdde86ac | 600 | kernel_restart(NULL); |
1da177e4 | 601 | break; |
a3d25c27 | 602 | case HIBERNATION_PLATFORM: |
7777fab9 | 603 | hibernation_platform_enter(); |
9cd9a005 | 604 | case HIBERNATION_SHUTDOWN: |
2c730785 SC |
605 | if (pm_power_off) |
606 | kernel_power_off(); | |
9cd9a005 | 607 | break; |
62c552cc BS |
608 | #ifdef CONFIG_SUSPEND |
609 | case HIBERNATION_SUSPEND: | |
610 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
611 | if (error) { | |
612 | if (hibernation_ops) | |
613 | hibernation_mode = HIBERNATION_PLATFORM; | |
614 | else | |
615 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
616 | power_down(); | |
617 | } | |
618 | /* | |
619 | * Restore swap signature. | |
620 | */ | |
621 | error = swsusp_unmark(); | |
622 | if (error) | |
623 | printk(KERN_ERR "PM: Swap will be unusable! " | |
624 | "Try swapon -a.\n"); | |
625 | return; | |
626 | #endif | |
1da177e4 | 627 | } |
fdde86ac | 628 | kernel_halt(); |
fe0c935a JB |
629 | /* |
630 | * Valid image is on the disk, if we continue we risk serious data | |
631 | * corruption after resume. | |
632 | */ | |
23976728 | 633 | printk(KERN_CRIT "PM: Please power down manually\n"); |
2c730785 SC |
634 | while (1) |
635 | cpu_relax(); | |
1da177e4 LT |
636 | } |
637 | ||
1da177e4 | 638 | /** |
f42a9813 | 639 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 640 | */ |
a3d25c27 | 641 | int hibernate(void) |
1da177e4 LT |
642 | { |
643 | int error; | |
644 | ||
bcda53fa | 645 | lock_system_sleep(); |
0709db60 | 646 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
647 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
648 | error = -EBUSY; | |
649 | goto Unlock; | |
650 | } | |
651 | ||
5a0a2f30 | 652 | pm_prepare_console(); |
b10d9117 RW |
653 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
654 | if (error) | |
655 | goto Exit; | |
0709db60 | 656 | |
23976728 | 657 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
658 | sys_sync(); |
659 | printk("done.\n"); | |
660 | ||
03afed8b | 661 | error = freeze_processes(); |
5a72e04d | 662 | if (error) |
8fd37a4c RW |
663 | goto Exit; |
664 | ||
942f4015 | 665 | lock_device_hotplug(); |
8fd37a4c RW |
666 | /* Allocate memory management structures */ |
667 | error = create_basic_memory_bitmaps(); | |
668 | if (error) | |
669 | goto Thaw; | |
1da177e4 | 670 | |
7777fab9 | 671 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 672 | if (error || freezer_test_done) |
8fd37a4c | 673 | goto Free_bitmaps; |
64a473cb RW |
674 | |
675 | if (in_suspend) { | |
a634cc10 RW |
676 | unsigned int flags = 0; |
677 | ||
678 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
679 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
680 | if (nocompress) |
681 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
682 | else |
683 | flags |= SF_CRC32_MODE; | |
684 | ||
1da177e4 | 685 | pr_debug("PM: writing image.\n"); |
a634cc10 | 686 | error = swsusp_write(flags); |
7777fab9 | 687 | swsusp_free(); |
1da177e4 | 688 | if (!error) |
fe0c935a | 689 | power_down(); |
5262a475 | 690 | in_suspend = 0; |
c9e664f1 | 691 | pm_restore_gfp_mask(); |
b918f6e6 | 692 | } else { |
1da177e4 | 693 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 694 | } |
64a473cb | 695 | |
8fd37a4c RW |
696 | Free_bitmaps: |
697 | free_basic_memory_bitmaps(); | |
b918f6e6 | 698 | Thaw: |
942f4015 | 699 | unlock_device_hotplug(); |
5a0a2f30 | 700 | thaw_processes(); |
a556d5b5 SB |
701 | |
702 | /* Don't bother checking whether freezer_test_done is true */ | |
703 | freezer_test_done = false; | |
0709db60 | 704 | Exit: |
b10d9117 | 705 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 706 | pm_restore_console(); |
0709db60 | 707 | atomic_inc(&snapshot_device_available); |
b10d9117 | 708 | Unlock: |
bcda53fa | 709 | unlock_system_sleep(); |
1da177e4 LT |
710 | return error; |
711 | } | |
712 | ||
713 | ||
714 | /** | |
f42a9813 RW |
715 | * software_resume - Resume from a saved hibernation image. |
716 | * | |
717 | * This routine is called as a late initcall, when all devices have been | |
718 | * discovered and initialized already. | |
1da177e4 | 719 | * |
f42a9813 RW |
720 | * The image reading code is called to see if there is a hibernation image |
721 | * available for reading. If that is the case, devices are quiesced and the | |
722 | * contents of memory is restored from the saved image. | |
1da177e4 | 723 | * |
f42a9813 RW |
724 | * If this is successful, control reappears in the restored target kernel in |
725 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
726 | * attempts to recover gracefully and make the kernel return to the normal mode | |
727 | * of operation. | |
1da177e4 | 728 | */ |
1da177e4 LT |
729 | static int software_resume(void) |
730 | { | |
731 | int error; | |
a634cc10 | 732 | unsigned int flags; |
1da177e4 | 733 | |
eed3ee08 AV |
734 | /* |
735 | * If the user said "noresume".. bail out early. | |
736 | */ | |
737 | if (noresume) | |
738 | return 0; | |
739 | ||
60a0d233 JB |
740 | /* |
741 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
742 | * is configured into the kernel. Since the regular hibernate | |
743 | * trigger path is via sysfs which takes a buffer mutex before | |
744 | * calling hibernate functions (which take pm_mutex) this can | |
745 | * cause lockdep to complain about a possible ABBA deadlock | |
746 | * which cannot happen since we're in the boot code here and | |
747 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
748 | * here to avoid lockdep complaining. | |
749 | */ | |
750 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
751 | |
752 | if (swsusp_resume_device) | |
753 | goto Check_image; | |
754 | ||
755 | if (!strlen(resume_file)) { | |
756 | error = -ENOENT; | |
757 | goto Unlock; | |
758 | } | |
759 | ||
d0941ead | 760 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 761 | |
f126f733 BS |
762 | if (resume_delay) { |
763 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
764 | resume_delay); | |
765 | ssleep(resume_delay); | |
766 | } | |
767 | ||
0c8454f5 RW |
768 | /* Check if the device is there */ |
769 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
770 | |
771 | /* | |
772 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
773 | * integer format. (e.g. major:minor) | |
774 | */ | |
775 | if (isdigit(resume_file[0]) && resume_wait) { | |
776 | int partno; | |
777 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
778 | msleep(10); | |
779 | } | |
780 | ||
3efa147a | 781 | if (!swsusp_resume_device) { |
eed3ee08 AV |
782 | /* |
783 | * Some device discovery might still be in progress; we need | |
784 | * to wait for this to finish. | |
785 | */ | |
786 | wait_for_device_probe(); | |
6f8d7022 BS |
787 | |
788 | if (resume_wait) { | |
789 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
790 | msleep(10); | |
791 | async_synchronize_full(); | |
792 | } | |
793 | ||
3efa147a | 794 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
795 | if (!swsusp_resume_device) { |
796 | error = -ENODEV; | |
797 | goto Unlock; | |
798 | } | |
3efa147a PM |
799 | } |
800 | ||
0c8454f5 | 801 | Check_image: |
d0941ead | 802 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 803 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 804 | |
d0941ead | 805 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
806 | error = swsusp_check(); |
807 | if (error) | |
74dfd666 | 808 | goto Unlock; |
1da177e4 | 809 | |
0709db60 RW |
810 | /* The snapshot device should not be opened while we're running */ |
811 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
812 | error = -EBUSY; | |
76b57e61 | 813 | swsusp_close(FMODE_READ); |
0709db60 RW |
814 | goto Unlock; |
815 | } | |
816 | ||
5a0a2f30 | 817 | pm_prepare_console(); |
c3e94d89 AS |
818 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
819 | if (error) | |
8fd37a4c | 820 | goto Close_Finish; |
1bfcf130 | 821 | |
74dfd666 | 822 | pr_debug("PM: Preparing processes for restore.\n"); |
03afed8b | 823 | error = freeze_processes(); |
8fd37a4c RW |
824 | if (error) |
825 | goto Close_Finish; | |
1da177e4 | 826 | |
d0941ead | 827 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 828 | |
942f4015 | 829 | lock_device_hotplug(); |
8fd37a4c RW |
830 | error = create_basic_memory_bitmaps(); |
831 | if (error) | |
832 | goto Thaw; | |
833 | ||
a634cc10 | 834 | error = swsusp_read(&flags); |
76b57e61 | 835 | swsusp_close(FMODE_READ); |
ed746e3b | 836 | if (!error) |
a634cc10 | 837 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 838 | |
d0941ead | 839 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 840 | swsusp_free(); |
7b5179ac | 841 | free_basic_memory_bitmaps(); |
8fd37a4c | 842 | Thaw: |
942f4015 | 843 | unlock_device_hotplug(); |
8fd37a4c | 844 | thaw_processes(); |
0709db60 | 845 | Finish: |
c3e94d89 | 846 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 847 | pm_restore_console(); |
0709db60 | 848 | atomic_inc(&snapshot_device_available); |
dd5d666b | 849 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 850 | Unlock: |
a6d70980 | 851 | mutex_unlock(&pm_mutex); |
d0941ead | 852 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 853 | return error; |
8fd37a4c | 854 | Close_Finish: |
76b57e61 JS |
855 | swsusp_close(FMODE_READ); |
856 | goto Finish; | |
1da177e4 LT |
857 | } |
858 | ||
d3c345db | 859 | late_initcall_sync(software_resume); |
1da177e4 LT |
860 | |
861 | ||
a3d25c27 RW |
862 | static const char * const hibernation_modes[] = { |
863 | [HIBERNATION_PLATFORM] = "platform", | |
864 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
865 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
866 | #ifdef CONFIG_SUSPEND |
867 | [HIBERNATION_SUSPEND] = "suspend", | |
868 | #endif | |
1da177e4 LT |
869 | }; |
870 | ||
f42a9813 RW |
871 | /* |
872 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 873 | * |
f42a9813 RW |
874 | * Hibernation can be handled in several ways. There are a few different ways |
875 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
876 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 877 | * mostly). |
1da177e4 | 878 | * |
f42a9813 RW |
879 | * The sysfs file /sys/power/disk provides an interface for selecting the |
880 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 881 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 882 | * |
1da177e4 LT |
883 | * 'platform' |
884 | * 'shutdown' | |
885 | * 'reboot' | |
886 | * | |
f42a9813 RW |
887 | * If a platform hibernation driver is in use, 'platform' will be supported |
888 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
889 | * The selected option (i.e. the one corresponding to the current value of | |
890 | * hibernation_mode) is enclosed by a square bracket. | |
891 | * | |
892 | * To select a given hibernation mode it is necessary to write the mode's | |
893 | * string representation (as returned by reading from /sys/power/disk) back | |
894 | * into /sys/power/disk. | |
1da177e4 LT |
895 | */ |
896 | ||
386f275f KS |
897 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
898 | char *buf) | |
1da177e4 | 899 | { |
f0ced9b2 JB |
900 | int i; |
901 | char *start = buf; | |
902 | ||
a3d25c27 RW |
903 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
904 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
905 | continue; |
906 | switch (i) { | |
a3d25c27 RW |
907 | case HIBERNATION_SHUTDOWN: |
908 | case HIBERNATION_REBOOT: | |
62c552cc BS |
909 | #ifdef CONFIG_SUSPEND |
910 | case HIBERNATION_SUSPEND: | |
911 | #endif | |
f0ced9b2 | 912 | break; |
a3d25c27 RW |
913 | case HIBERNATION_PLATFORM: |
914 | if (hibernation_ops) | |
f0ced9b2 JB |
915 | break; |
916 | /* not a valid mode, continue with loop */ | |
917 | continue; | |
918 | } | |
a3d25c27 RW |
919 | if (i == hibernation_mode) |
920 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 921 | else |
a3d25c27 | 922 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
923 | } |
924 | buf += sprintf(buf, "\n"); | |
925 | return buf-start; | |
1da177e4 LT |
926 | } |
927 | ||
386f275f KS |
928 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
929 | const char *buf, size_t n) | |
1da177e4 LT |
930 | { |
931 | int error = 0; | |
932 | int i; | |
933 | int len; | |
934 | char *p; | |
a3d25c27 | 935 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
936 | |
937 | p = memchr(buf, '\n', n); | |
938 | len = p ? p - buf : n; | |
939 | ||
bcda53fa | 940 | lock_system_sleep(); |
a3d25c27 | 941 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
942 | if (len == strlen(hibernation_modes[i]) |
943 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
944 | mode = i; |
945 | break; | |
946 | } | |
947 | } | |
a3d25c27 | 948 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 949 | switch (mode) { |
a3d25c27 RW |
950 | case HIBERNATION_SHUTDOWN: |
951 | case HIBERNATION_REBOOT: | |
62c552cc BS |
952 | #ifdef CONFIG_SUSPEND |
953 | case HIBERNATION_SUSPEND: | |
954 | #endif | |
a3d25c27 | 955 | hibernation_mode = mode; |
fe0c935a | 956 | break; |
a3d25c27 RW |
957 | case HIBERNATION_PLATFORM: |
958 | if (hibernation_ops) | |
959 | hibernation_mode = mode; | |
1da177e4 LT |
960 | else |
961 | error = -EINVAL; | |
962 | } | |
a3d25c27 | 963 | } else |
1da177e4 LT |
964 | error = -EINVAL; |
965 | ||
a3d25c27 | 966 | if (!error) |
23976728 | 967 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 968 | hibernation_modes[mode]); |
bcda53fa | 969 | unlock_system_sleep(); |
1da177e4 LT |
970 | return error ? error : n; |
971 | } | |
972 | ||
973 | power_attr(disk); | |
974 | ||
386f275f KS |
975 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
976 | char *buf) | |
1da177e4 LT |
977 | { |
978 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
979 | MINOR(swsusp_resume_device)); | |
980 | } | |
981 | ||
386f275f KS |
982 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
983 | const char *buf, size_t n) | |
1da177e4 | 984 | { |
1da177e4 | 985 | dev_t res; |
421a5fa1 SC |
986 | int len = n; |
987 | char *name; | |
1da177e4 | 988 | |
421a5fa1 SC |
989 | if (len && buf[len-1] == '\n') |
990 | len--; | |
991 | name = kstrndup(buf, len, GFP_KERNEL); | |
992 | if (!name) | |
993 | return -ENOMEM; | |
1da177e4 | 994 | |
421a5fa1 SC |
995 | res = name_to_dev_t(name); |
996 | kfree(name); | |
997 | if (!res) | |
998 | return -EINVAL; | |
1da177e4 | 999 | |
bcda53fa | 1000 | lock_system_sleep(); |
a576219a | 1001 | swsusp_resume_device = res; |
bcda53fa | 1002 | unlock_system_sleep(); |
23976728 | 1003 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
1004 | noresume = 0; |
1005 | software_resume(); | |
421a5fa1 | 1006 | return n; |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | power_attr(resume); | |
1010 | ||
386f275f KS |
1011 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
1012 | char *buf) | |
ca0aec0f | 1013 | { |
853609b6 | 1014 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1015 | } |
1016 | ||
386f275f KS |
1017 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1018 | const char *buf, size_t n) | |
ca0aec0f | 1019 | { |
853609b6 | 1020 | unsigned long size; |
ca0aec0f | 1021 | |
853609b6 | 1022 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1023 | image_size = size; |
1024 | return n; | |
1025 | } | |
1026 | ||
1027 | return -EINVAL; | |
1028 | } | |
1029 | ||
1030 | power_attr(image_size); | |
1031 | ||
ddeb6487 RW |
1032 | static ssize_t reserved_size_show(struct kobject *kobj, |
1033 | struct kobj_attribute *attr, char *buf) | |
1034 | { | |
1035 | return sprintf(buf, "%lu\n", reserved_size); | |
1036 | } | |
1037 | ||
1038 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1039 | struct kobj_attribute *attr, | |
1040 | const char *buf, size_t n) | |
1041 | { | |
1042 | unsigned long size; | |
1043 | ||
1044 | if (sscanf(buf, "%lu", &size) == 1) { | |
1045 | reserved_size = size; | |
1046 | return n; | |
1047 | } | |
1048 | ||
1049 | return -EINVAL; | |
1050 | } | |
1051 | ||
1052 | power_attr(reserved_size); | |
1053 | ||
1da177e4 LT |
1054 | static struct attribute * g[] = { |
1055 | &disk_attr.attr, | |
1056 | &resume_attr.attr, | |
ca0aec0f | 1057 | &image_size_attr.attr, |
ddeb6487 | 1058 | &reserved_size_attr.attr, |
1da177e4 LT |
1059 | NULL, |
1060 | }; | |
1061 | ||
1062 | ||
1063 | static struct attribute_group attr_group = { | |
1064 | .attrs = g, | |
1065 | }; | |
1066 | ||
1067 | ||
1068 | static int __init pm_disk_init(void) | |
1069 | { | |
d76e15fb | 1070 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | core_initcall(pm_disk_init); | |
1074 | ||
1075 | ||
1076 | static int __init resume_setup(char *str) | |
1077 | { | |
1078 | if (noresume) | |
1079 | return 1; | |
1080 | ||
1081 | strncpy( resume_file, str, 255 ); | |
1082 | return 1; | |
1083 | } | |
1084 | ||
9a154d9d RW |
1085 | static int __init resume_offset_setup(char *str) |
1086 | { | |
1087 | unsigned long long offset; | |
1088 | ||
1089 | if (noresume) | |
1090 | return 1; | |
1091 | ||
1092 | if (sscanf(str, "%llu", &offset) == 1) | |
1093 | swsusp_resume_block = offset; | |
1094 | ||
1095 | return 1; | |
1096 | } | |
1097 | ||
f996fc96 BS |
1098 | static int __init hibernate_setup(char *str) |
1099 | { | |
1100 | if (!strncmp(str, "noresume", 8)) | |
1101 | noresume = 1; | |
1102 | else if (!strncmp(str, "nocompress", 10)) | |
1103 | nocompress = 1; | |
1104 | return 1; | |
1105 | } | |
1106 | ||
1da177e4 LT |
1107 | static int __init noresume_setup(char *str) |
1108 | { | |
1109 | noresume = 1; | |
1110 | return 1; | |
1111 | } | |
1112 | ||
6f8d7022 BS |
1113 | static int __init resumewait_setup(char *str) |
1114 | { | |
1115 | resume_wait = 1; | |
1116 | return 1; | |
1117 | } | |
1118 | ||
f126f733 BS |
1119 | static int __init resumedelay_setup(char *str) |
1120 | { | |
f6514be5 | 1121 | int rc = kstrtouint(str, 0, &resume_delay); |
317cf7e5 FF |
1122 | |
1123 | if (rc) | |
1124 | return rc; | |
f126f733 BS |
1125 | return 1; |
1126 | } | |
1127 | ||
1da177e4 | 1128 | __setup("noresume", noresume_setup); |
9a154d9d | 1129 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1130 | __setup("resume=", resume_setup); |
f996fc96 | 1131 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1132 | __setup("resumewait", resumewait_setup); |
f126f733 | 1133 | __setup("resumedelay=", resumedelay_setup); |