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