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> | |
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; | |
38 | static 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; |
d231ff1a | 42 | 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 RW |
84 | } |
85 | ||
abfe2d7b RW |
86 | static bool entering_platform_hibernation; |
87 | ||
88 | bool system_entering_hibernation(void) | |
89 | { | |
90 | return entering_platform_hibernation; | |
91 | } | |
92 | EXPORT_SYMBOL(system_entering_hibernation); | |
93 | ||
4cc79776 RW |
94 | #ifdef CONFIG_PM_DEBUG |
95 | static void hibernation_debug_sleep(void) | |
96 | { | |
97 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
98 | mdelay(5000); | |
99 | } | |
100 | ||
4cc79776 RW |
101 | static int hibernation_test(int level) |
102 | { | |
103 | if (pm_test_level == level) { | |
104 | hibernation_debug_sleep(); | |
105 | return 1; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | #else /* !CONFIG_PM_DEBUG */ | |
4cc79776 RW |
110 | static int hibernation_test(int level) { return 0; } |
111 | #endif /* !CONFIG_PM_DEBUG */ | |
112 | ||
74f270af | 113 | /** |
f42a9813 RW |
114 | * platform_begin - Call platform to start hibernation. |
115 | * @platform_mode: Whether or not to use the platform driver. | |
74f270af | 116 | */ |
caea99ef | 117 | static int platform_begin(int platform_mode) |
74f270af RW |
118 | { |
119 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
120 | hibernation_ops->begin() : 0; |
121 | } | |
122 | ||
123 | /** | |
f42a9813 RW |
124 | * platform_end - Call platform to finish transition to the working state. |
125 | * @platform_mode: Whether or not to use the platform driver. | |
caea99ef | 126 | */ |
caea99ef RW |
127 | static void platform_end(int platform_mode) |
128 | { | |
129 | if (platform_mode && hibernation_ops) | |
130 | hibernation_ops->end(); | |
74f270af | 131 | } |
a3d25c27 | 132 | |
8a05aac2 | 133 | /** |
f42a9813 RW |
134 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
135 | * @platform_mode: Whether or not to use the platform driver. | |
136 | * | |
137 | * Use the platform driver to prepare the system for creating a hibernate image, | |
138 | * if so configured, and return an error code if that fails. | |
8a05aac2 SS |
139 | */ |
140 | ||
74f270af | 141 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 142 | { |
7777fab9 | 143 | return (platform_mode && hibernation_ops) ? |
74f270af | 144 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 145 | } |
8a05aac2 | 146 | |
c7e0831d | 147 | /** |
f42a9813 RW |
148 | * platform_leave - Call platform to prepare a transition to the working state. |
149 | * @platform_mode: Whether or not to use the platform driver. | |
150 | * | |
151 | * Use the platform driver prepare to prepare the machine for switching to the | |
152 | * normal mode of operation. | |
153 | * | |
154 | * This routine is called on one CPU with interrupts disabled. | |
c7e0831d | 155 | */ |
c7e0831d RW |
156 | static void platform_leave(int platform_mode) |
157 | { | |
158 | if (platform_mode && hibernation_ops) | |
159 | hibernation_ops->leave(); | |
160 | } | |
161 | ||
a3d25c27 | 162 | /** |
f42a9813 RW |
163 | * platform_finish - Call platform to switch the system to the working state. |
164 | * @platform_mode: Whether or not to use the platform driver. | |
165 | * | |
166 | * Use the platform driver to switch the machine to the normal mode of | |
167 | * operation. | |
168 | * | |
169 | * This routine must be called after platform_prepare(). | |
a3d25c27 | 170 | */ |
7777fab9 | 171 | static void platform_finish(int platform_mode) |
a3d25c27 | 172 | { |
7777fab9 | 173 | if (platform_mode && hibernation_ops) |
a3d25c27 | 174 | hibernation_ops->finish(); |
8a05aac2 SS |
175 | } |
176 | ||
a634cc10 | 177 | /** |
f42a9813 RW |
178 | * platform_pre_restore - Prepare for hibernate image restoration. |
179 | * @platform_mode: Whether or not to use the platform driver. | |
180 | * | |
181 | * Use the platform driver to prepare the system for resume from a hibernation | |
182 | * image. | |
183 | * | |
184 | * If the restore fails after this function has been called, | |
185 | * platform_restore_cleanup() must be called. | |
a634cc10 | 186 | */ |
a634cc10 RW |
187 | static int platform_pre_restore(int platform_mode) |
188 | { | |
189 | return (platform_mode && hibernation_ops) ? | |
190 | hibernation_ops->pre_restore() : 0; | |
191 | } | |
192 | ||
193 | /** | |
f42a9813 RW |
194 | * platform_restore_cleanup - Switch to the working state after failing restore. |
195 | * @platform_mode: Whether or not to use the platform driver. | |
196 | * | |
197 | * Use the platform driver to switch the system to the normal mode of operation | |
198 | * after a failing restore. | |
199 | * | |
200 | * If platform_pre_restore() has been called before the failing restore, this | |
201 | * function must be called too, regardless of the result of | |
202 | * platform_pre_restore(). | |
a634cc10 | 203 | */ |
a634cc10 RW |
204 | static void platform_restore_cleanup(int platform_mode) |
205 | { | |
206 | if (platform_mode && hibernation_ops) | |
207 | hibernation_ops->restore_cleanup(); | |
208 | } | |
209 | ||
d8f3de0d | 210 | /** |
f42a9813 RW |
211 | * platform_recover - Recover from a failure to suspend devices. |
212 | * @platform_mode: Whether or not to use the platform driver. | |
d8f3de0d | 213 | */ |
d8f3de0d RW |
214 | static void platform_recover(int platform_mode) |
215 | { | |
216 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
217 | hibernation_ops->recover(); | |
218 | } | |
219 | ||
8e60c6a1 | 220 | /** |
f42a9813 RW |
221 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
222 | * @start: Starting event. | |
223 | * @stop: Final event. | |
224 | * @nr_pages: Number of memory pages processed between @start and @stop. | |
225 | * @msg: Additional diagnostic message to print. | |
8e60c6a1 | 226 | */ |
8e60c6a1 NC |
227 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
228 | unsigned nr_pages, char *msg) | |
229 | { | |
230 | s64 elapsed_centisecs64; | |
231 | int centisecs; | |
232 | int k; | |
233 | int kps; | |
234 | ||
235 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); | |
236 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); | |
237 | centisecs = elapsed_centisecs64; | |
238 | if (centisecs == 0) | |
239 | centisecs = 1; /* avoid div-by-zero */ | |
240 | k = nr_pages * (PAGE_SIZE / 1024); | |
241 | kps = (k * 100) / centisecs; | |
242 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", | |
243 | msg, k, | |
244 | centisecs / 100, centisecs % 100, | |
245 | kps / 1000, (kps % 1000) / 10); | |
246 | } | |
247 | ||
c7e0831d | 248 | /** |
f42a9813 RW |
249 | * create_image - Create a hibernation image. |
250 | * @platform_mode: Whether or not to use the platform driver. | |
251 | * | |
cf579dfb RW |
252 | * Execute device drivers' "late" and "noirq" freeze callbacks, create a |
253 | * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. | |
f42a9813 RW |
254 | * |
255 | * Control reappears in this routine after the subsequent restore. | |
c7e0831d | 256 | */ |
47a460d5 | 257 | static int create_image(int platform_mode) |
c7e0831d RW |
258 | { |
259 | int error; | |
260 | ||
cf579dfb | 261 | error = dpm_suspend_end(PMSG_FREEZE); |
c7e0831d | 262 | if (error) { |
23976728 RW |
263 | printk(KERN_ERR "PM: Some devices failed to power down, " |
264 | "aborting hibernation\n"); | |
32bdfac5 | 265 | return error; |
c7e0831d | 266 | } |
2ed8d2b3 | 267 | |
4aecd671 RW |
268 | error = platform_pre_snapshot(platform_mode); |
269 | if (error || hibernation_test(TEST_PLATFORM)) | |
270 | goto Platform_finish; | |
271 | ||
272 | error = disable_nonboot_cpus(); | |
48580ab8 | 273 | if (error || hibernation_test(TEST_CPUS)) |
4aecd671 RW |
274 | goto Enable_cpus; |
275 | ||
2ed8d2b3 RW |
276 | local_irq_disable(); |
277 | ||
2e711c04 | 278 | error = syscore_suspend(); |
770824bd | 279 | if (error) { |
4484079d | 280 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 281 | "aborting hibernation\n"); |
4aecd671 | 282 | goto Enable_irqs; |
770824bd | 283 | } |
c7e0831d | 284 | |
a2867e08 | 285 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
4cc79776 RW |
286 | goto Power_up; |
287 | ||
288 | in_suspend = 1; | |
c7e0831d RW |
289 | save_processor_state(); |
290 | error = swsusp_arch_suspend(); | |
291 | if (error) | |
23976728 RW |
292 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
293 | error); | |
c7e0831d RW |
294 | /* Restore control flow magically appears here */ |
295 | restore_processor_state(); | |
c125e96f RW |
296 | if (!in_suspend) { |
297 | events_check_enabled = false; | |
c7e0831d | 298 | platform_leave(platform_mode); |
c125e96f | 299 | } |
4aecd671 | 300 | |
4cc79776 | 301 | Power_up: |
40dc166c | 302 | syscore_resume(); |
2ed8d2b3 | 303 | |
4aecd671 | 304 | Enable_irqs: |
2ed8d2b3 RW |
305 | local_irq_enable(); |
306 | ||
4aecd671 RW |
307 | Enable_cpus: |
308 | enable_nonboot_cpus(); | |
309 | ||
310 | Platform_finish: | |
311 | platform_finish(platform_mode); | |
312 | ||
cf579dfb | 313 | dpm_resume_start(in_suspend ? |
1eede070 | 314 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 315 | |
c7e0831d RW |
316 | return error; |
317 | } | |
318 | ||
7777fab9 | 319 | /** |
f42a9813 RW |
320 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
321 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 322 | * |
f42a9813 | 323 | * This routine must be called with pm_mutex held. |
7777fab9 | 324 | */ |
7777fab9 RW |
325 | int hibernation_snapshot(int platform_mode) |
326 | { | |
953a2063 | 327 | pm_message_t msg; |
cbe2f5a6 | 328 | int error; |
7777fab9 | 329 | |
3fe0313e | 330 | error = platform_begin(platform_mode); |
7777fab9 | 331 | if (error) |
d074ee02 | 332 | goto Close; |
7777fab9 | 333 | |
64a473cb RW |
334 | /* Preallocate image memory before shutting down devices. */ |
335 | error = hibernate_preallocate_memory(); | |
2aede851 RW |
336 | if (error) |
337 | goto Close; | |
338 | ||
339 | error = freeze_kernel_threads(); | |
340 | if (error) | |
bb58dd5d | 341 | goto Cleanup; |
2aede851 | 342 | |
48580ab8 | 343 | if (hibernation_test(TEST_FREEZER)) { |
aa9a7b11 SB |
344 | |
345 | /* | |
346 | * Indicate to the caller that we are returning due to a | |
347 | * successful freezer test. | |
348 | */ | |
349 | freezer_test_done = true; | |
51d6ff7a | 350 | goto Thaw; |
aa9a7b11 SB |
351 | } |
352 | ||
2aede851 | 353 | error = dpm_prepare(PMSG_FREEZE); |
bb58dd5d | 354 | if (error) { |
953a2063 | 355 | dpm_complete(PMSG_RECOVER); |
51d6ff7a | 356 | goto Thaw; |
bb58dd5d | 357 | } |
74f270af | 358 | |
7777fab9 | 359 | suspend_console(); |
443772d4 | 360 | ftrace_stop(); |
c9e664f1 | 361 | pm_restrict_gfp_mask(); |
953a2063 | 362 | |
91e7c75b | 363 | error = dpm_suspend(PMSG_FREEZE); |
10a1803d | 364 | |
953a2063 SB |
365 | if (error || hibernation_test(TEST_DEVICES)) |
366 | platform_recover(platform_mode); | |
367 | else | |
368 | error = create_image(platform_mode); | |
7777fab9 | 369 | |
c9e664f1 | 370 | /* |
953a2063 SB |
371 | * In the case that we call create_image() above, the control |
372 | * returns here (1) after the image has been created or the | |
c9e664f1 RW |
373 | * image creation has failed and (2) after a successful restore. |
374 | */ | |
4cc79776 | 375 | |
64a473cb RW |
376 | /* We may need to release the preallocated image pages here. */ |
377 | if (error || !in_suspend) | |
378 | swsusp_free(); | |
379 | ||
91e7c75b RW |
380 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
381 | dpm_resume(msg); | |
c9e664f1 RW |
382 | |
383 | if (error || !in_suspend) | |
384 | pm_restore_gfp_mask(); | |
385 | ||
443772d4 | 386 | ftrace_start(); |
7777fab9 | 387 | resume_console(); |
91e7c75b RW |
388 | dpm_complete(msg); |
389 | ||
caea99ef RW |
390 | Close: |
391 | platform_end(platform_mode); | |
7777fab9 | 392 | return error; |
d8f3de0d | 393 | |
51d6ff7a SB |
394 | Thaw: |
395 | thaw_kernel_threads(); | |
bb58dd5d RW |
396 | Cleanup: |
397 | swsusp_free(); | |
398 | goto Close; | |
7777fab9 RW |
399 | } |
400 | ||
72df68ca | 401 | /** |
f42a9813 RW |
402 | * resume_target_kernel - Restore system state from a hibernation image. |
403 | * @platform_mode: Whether or not to use the platform driver. | |
404 | * | |
cf579dfb RW |
405 | * Execute device drivers' "noirq" and "late" freeze callbacks, restore the |
406 | * contents of highmem that have not been restored yet from the image and run | |
407 | * the low-level code that will restore the remaining contents of memory and | |
408 | * switch to the just restored target kernel. | |
72df68ca | 409 | */ |
4aecd671 | 410 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
411 | { |
412 | int error; | |
413 | ||
cf579dfb | 414 | error = dpm_suspend_end(PMSG_QUIESCE); |
72df68ca | 415 | if (error) { |
23976728 | 416 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 417 | "aborting resume\n"); |
32bdfac5 | 418 | return error; |
72df68ca | 419 | } |
2ed8d2b3 | 420 | |
4aecd671 RW |
421 | error = platform_pre_restore(platform_mode); |
422 | if (error) | |
423 | goto Cleanup; | |
424 | ||
425 | error = disable_nonboot_cpus(); | |
426 | if (error) | |
427 | goto Enable_cpus; | |
428 | ||
2ed8d2b3 RW |
429 | local_irq_disable(); |
430 | ||
2e711c04 | 431 | error = syscore_suspend(); |
4aecd671 RW |
432 | if (error) |
433 | goto Enable_irqs; | |
434 | ||
72df68ca RW |
435 | save_processor_state(); |
436 | error = restore_highmem(); | |
437 | if (!error) { | |
438 | error = swsusp_arch_resume(); | |
439 | /* | |
440 | * The code below is only ever reached in case of a failure. | |
4e2d9491 RW |
441 | * Otherwise, execution continues at the place where |
442 | * swsusp_arch_suspend() was called. | |
72df68ca RW |
443 | */ |
444 | BUG_ON(!error); | |
4e2d9491 RW |
445 | /* |
446 | * This call to restore_highmem() reverts the changes made by | |
447 | * the previous one. | |
448 | */ | |
72df68ca RW |
449 | restore_highmem(); |
450 | } | |
451 | /* | |
452 | * The only reason why swsusp_arch_resume() can fail is memory being | |
453 | * very tight, so we have to free it as soon as we can to avoid | |
4e2d9491 | 454 | * subsequent failures. |
72df68ca RW |
455 | */ |
456 | swsusp_free(); | |
457 | restore_processor_state(); | |
458 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 459 | |
40dc166c | 460 | syscore_resume(); |
2ed8d2b3 | 461 | |
4aecd671 | 462 | Enable_irqs: |
72df68ca | 463 | local_irq_enable(); |
2ed8d2b3 | 464 | |
4aecd671 RW |
465 | Enable_cpus: |
466 | enable_nonboot_cpus(); | |
467 | ||
468 | Cleanup: | |
469 | platform_restore_cleanup(platform_mode); | |
470 | ||
cf579dfb | 471 | dpm_resume_start(PMSG_RECOVER); |
2ed8d2b3 | 472 | |
72df68ca RW |
473 | return error; |
474 | } | |
475 | ||
7777fab9 | 476 | /** |
f42a9813 RW |
477 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
478 | * @platform_mode: If set, use platform driver to prepare for the transition. | |
7777fab9 | 479 | * |
f42a9813 | 480 | * This routine must be called with pm_mutex held. If it is successful, control |
21e82808 | 481 | * reappears in the restored target kernel in hibernation_snapshot(). |
7777fab9 | 482 | */ |
a634cc10 | 483 | int hibernation_restore(int platform_mode) |
7777fab9 | 484 | { |
cbe2f5a6 | 485 | int error; |
7777fab9 RW |
486 | |
487 | pm_prepare_console(); | |
488 | suspend_console(); | |
443772d4 | 489 | ftrace_stop(); |
c9e664f1 | 490 | pm_restrict_gfp_mask(); |
d1616302 | 491 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 492 | if (!error) { |
4aecd671 | 493 | error = resume_target_kernel(platform_mode); |
d1616302 | 494 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 495 | } |
c9e664f1 | 496 | pm_restore_gfp_mask(); |
443772d4 | 497 | ftrace_start(); |
7777fab9 RW |
498 | resume_console(); |
499 | pm_restore_console(); | |
500 | return error; | |
501 | } | |
502 | ||
503 | /** | |
f42a9813 | 504 | * hibernation_platform_enter - Power off the system using the platform driver. |
7777fab9 | 505 | */ |
7777fab9 RW |
506 | int hibernation_platform_enter(void) |
507 | { | |
cbe2f5a6 | 508 | int error; |
b1457bcc | 509 | |
9cd9a005 RW |
510 | if (!hibernation_ops) |
511 | return -ENOSYS; | |
512 | ||
513 | /* | |
514 | * We have cancelled the power transition by running | |
515 | * hibernation_ops->finish() before saving the image, so we should let | |
516 | * the firmware know that we're going to enter the sleep state after all | |
517 | */ | |
caea99ef | 518 | error = hibernation_ops->begin(); |
9cd9a005 | 519 | if (error) |
caea99ef | 520 | goto Close; |
9cd9a005 | 521 | |
abfe2d7b | 522 | entering_platform_hibernation = true; |
9cd9a005 | 523 | suspend_console(); |
443772d4 | 524 | ftrace_stop(); |
d1616302 | 525 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
526 | if (error) { |
527 | if (hibernation_ops->recover) | |
528 | hibernation_ops->recover(); | |
529 | goto Resume_devices; | |
530 | } | |
9cd9a005 | 531 | |
cf579dfb | 532 | error = dpm_suspend_end(PMSG_HIBERNATE); |
4aecd671 | 533 | if (error) |
32bdfac5 | 534 | goto Resume_devices; |
4aecd671 | 535 | |
9cd9a005 RW |
536 | error = hibernation_ops->prepare(); |
537 | if (error) | |
e681c9dd | 538 | goto Platform_finish; |
9cd9a005 RW |
539 | |
540 | error = disable_nonboot_cpus(); | |
541 | if (error) | |
e681c9dd | 542 | goto Platform_finish; |
2ed8d2b3 | 543 | |
4aecd671 | 544 | local_irq_disable(); |
40dc166c | 545 | syscore_suspend(); |
a2867e08 | 546 | if (pm_wakeup_pending()) { |
c125e96f RW |
547 | error = -EAGAIN; |
548 | goto Power_up; | |
549 | } | |
550 | ||
4aecd671 RW |
551 | hibernation_ops->enter(); |
552 | /* We should never get here */ | |
553 | while (1); | |
9cd9a005 | 554 | |
c125e96f | 555 | Power_up: |
40dc166c | 556 | syscore_resume(); |
c125e96f RW |
557 | local_irq_enable(); |
558 | enable_nonboot_cpus(); | |
559 | ||
e681c9dd | 560 | Platform_finish: |
9cd9a005 | 561 | hibernation_ops->finish(); |
2ed8d2b3 | 562 | |
cf579dfb | 563 | dpm_resume_start(PMSG_RESTORE); |
4aecd671 | 564 | |
9cd9a005 | 565 | Resume_devices: |
abfe2d7b | 566 | entering_platform_hibernation = false; |
d1616302 | 567 | dpm_resume_end(PMSG_RESTORE); |
443772d4 | 568 | ftrace_start(); |
9cd9a005 | 569 | resume_console(); |
2ed8d2b3 | 570 | |
caea99ef RW |
571 | Close: |
572 | hibernation_ops->end(); | |
2ed8d2b3 | 573 | |
b1457bcc | 574 | return error; |
7777fab9 RW |
575 | } |
576 | ||
1da177e4 | 577 | /** |
f42a9813 | 578 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 579 | * |
f42a9813 RW |
580 | * Use the platform driver, if configured, to put the system into the sleep |
581 | * state corresponding to hibernation, or try to power it off or reboot, | |
582 | * depending on the value of hibernation_mode. | |
1da177e4 | 583 | */ |
fe0c935a | 584 | static void power_down(void) |
1da177e4 | 585 | { |
62c552cc BS |
586 | #ifdef CONFIG_SUSPEND |
587 | int error; | |
588 | #endif | |
589 | ||
a3d25c27 | 590 | switch (hibernation_mode) { |
a3d25c27 | 591 | case HIBERNATION_REBOOT: |
fdde86ac | 592 | kernel_restart(NULL); |
1da177e4 | 593 | break; |
a3d25c27 | 594 | case HIBERNATION_PLATFORM: |
7777fab9 | 595 | hibernation_platform_enter(); |
9cd9a005 RW |
596 | case HIBERNATION_SHUTDOWN: |
597 | kernel_power_off(); | |
598 | break; | |
62c552cc BS |
599 | #ifdef CONFIG_SUSPEND |
600 | case HIBERNATION_SUSPEND: | |
601 | error = suspend_devices_and_enter(PM_SUSPEND_MEM); | |
602 | if (error) { | |
603 | if (hibernation_ops) | |
604 | hibernation_mode = HIBERNATION_PLATFORM; | |
605 | else | |
606 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
607 | power_down(); | |
608 | } | |
609 | /* | |
610 | * Restore swap signature. | |
611 | */ | |
612 | error = swsusp_unmark(); | |
613 | if (error) | |
614 | printk(KERN_ERR "PM: Swap will be unusable! " | |
615 | "Try swapon -a.\n"); | |
616 | return; | |
617 | #endif | |
1da177e4 | 618 | } |
fdde86ac | 619 | kernel_halt(); |
fe0c935a JB |
620 | /* |
621 | * Valid image is on the disk, if we continue we risk serious data | |
622 | * corruption after resume. | |
623 | */ | |
23976728 | 624 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
625 | while(1); |
626 | } | |
627 | ||
1da177e4 | 628 | /** |
f42a9813 | 629 | * hibernate - Carry out system hibernation, including saving the image. |
1da177e4 | 630 | */ |
a3d25c27 | 631 | int hibernate(void) |
1da177e4 LT |
632 | { |
633 | int error; | |
634 | ||
bcda53fa | 635 | lock_system_sleep(); |
0709db60 | 636 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
637 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
638 | error = -EBUSY; | |
639 | goto Unlock; | |
640 | } | |
641 | ||
5a0a2f30 | 642 | pm_prepare_console(); |
b10d9117 RW |
643 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
644 | if (error) | |
645 | goto Exit; | |
0709db60 RW |
646 | |
647 | /* Allocate memory management structures */ | |
648 | error = create_basic_memory_bitmaps(); | |
649 | if (error) | |
7b5179ac | 650 | goto Exit; |
0709db60 | 651 | |
23976728 | 652 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
653 | sys_sync(); |
654 | printk("done.\n"); | |
655 | ||
03afed8b | 656 | error = freeze_processes(); |
5a72e04d | 657 | if (error) |
05b4877f | 658 | goto Free_bitmaps; |
1da177e4 | 659 | |
7777fab9 | 660 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
a556d5b5 | 661 | if (error || freezer_test_done) |
aa9a7b11 | 662 | goto Thaw; |
64a473cb RW |
663 | |
664 | if (in_suspend) { | |
a634cc10 RW |
665 | unsigned int flags = 0; |
666 | ||
667 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
668 | flags |= SF_PLATFORM_MODE; | |
f996fc96 BS |
669 | if (nocompress) |
670 | flags |= SF_NOCOMPRESS_MODE; | |
081a9d04 BS |
671 | else |
672 | flags |= SF_CRC32_MODE; | |
673 | ||
1da177e4 | 674 | pr_debug("PM: writing image.\n"); |
a634cc10 | 675 | error = swsusp_write(flags); |
7777fab9 | 676 | swsusp_free(); |
1da177e4 | 677 | if (!error) |
fe0c935a | 678 | power_down(); |
5262a475 | 679 | in_suspend = 0; |
c9e664f1 | 680 | pm_restore_gfp_mask(); |
b918f6e6 | 681 | } else { |
1da177e4 | 682 | pr_debug("PM: Image restored successfully.\n"); |
b918f6e6 | 683 | } |
64a473cb | 684 | |
b918f6e6 | 685 | Thaw: |
5a0a2f30 | 686 | thaw_processes(); |
a556d5b5 SB |
687 | |
688 | /* Don't bother checking whether freezer_test_done is true */ | |
689 | freezer_test_done = false; | |
690 | ||
05b4877f | 691 | Free_bitmaps: |
7b5179ac | 692 | free_basic_memory_bitmaps(); |
0709db60 | 693 | Exit: |
b10d9117 | 694 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 695 | pm_restore_console(); |
0709db60 | 696 | atomic_inc(&snapshot_device_available); |
b10d9117 | 697 | Unlock: |
bcda53fa | 698 | unlock_system_sleep(); |
1da177e4 LT |
699 | return error; |
700 | } | |
701 | ||
702 | ||
703 | /** | |
f42a9813 RW |
704 | * software_resume - Resume from a saved hibernation image. |
705 | * | |
706 | * This routine is called as a late initcall, when all devices have been | |
707 | * discovered and initialized already. | |
1da177e4 | 708 | * |
f42a9813 RW |
709 | * The image reading code is called to see if there is a hibernation image |
710 | * available for reading. If that is the case, devices are quiesced and the | |
711 | * contents of memory is restored from the saved image. | |
1da177e4 | 712 | * |
f42a9813 RW |
713 | * If this is successful, control reappears in the restored target kernel in |
714 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine | |
715 | * attempts to recover gracefully and make the kernel return to the normal mode | |
716 | * of operation. | |
1da177e4 | 717 | */ |
1da177e4 LT |
718 | static int software_resume(void) |
719 | { | |
720 | int error; | |
a634cc10 | 721 | unsigned int flags; |
1da177e4 | 722 | |
eed3ee08 AV |
723 | /* |
724 | * If the user said "noresume".. bail out early. | |
725 | */ | |
726 | if (noresume) | |
727 | return 0; | |
728 | ||
60a0d233 JB |
729 | /* |
730 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
731 | * is configured into the kernel. Since the regular hibernate | |
732 | * trigger path is via sysfs which takes a buffer mutex before | |
733 | * calling hibernate functions (which take pm_mutex) this can | |
734 | * cause lockdep to complain about a possible ABBA deadlock | |
735 | * which cannot happen since we're in the boot code here and | |
736 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
737 | * here to avoid lockdep complaining. | |
738 | */ | |
739 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
740 | |
741 | if (swsusp_resume_device) | |
742 | goto Check_image; | |
743 | ||
744 | if (!strlen(resume_file)) { | |
745 | error = -ENOENT; | |
746 | goto Unlock; | |
747 | } | |
748 | ||
d0941ead | 749 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
0c8454f5 | 750 | |
f126f733 BS |
751 | if (resume_delay) { |
752 | printk(KERN_INFO "Waiting %dsec before reading resume device...\n", | |
753 | resume_delay); | |
754 | ssleep(resume_delay); | |
755 | } | |
756 | ||
0c8454f5 RW |
757 | /* Check if the device is there */ |
758 | swsusp_resume_device = name_to_dev_t(resume_file); | |
2df83fa4 MB |
759 | |
760 | /* | |
761 | * name_to_dev_t is ineffective to verify parition if resume_file is in | |
762 | * integer format. (e.g. major:minor) | |
763 | */ | |
764 | if (isdigit(resume_file[0]) && resume_wait) { | |
765 | int partno; | |
766 | while (!get_gendisk(swsusp_resume_device, &partno)) | |
767 | msleep(10); | |
768 | } | |
769 | ||
3efa147a | 770 | if (!swsusp_resume_device) { |
eed3ee08 AV |
771 | /* |
772 | * Some device discovery might still be in progress; we need | |
773 | * to wait for this to finish. | |
774 | */ | |
775 | wait_for_device_probe(); | |
6f8d7022 BS |
776 | |
777 | if (resume_wait) { | |
778 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) | |
779 | msleep(10); | |
780 | async_synchronize_full(); | |
781 | } | |
782 | ||
3efa147a | 783 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
784 | if (!swsusp_resume_device) { |
785 | error = -ENODEV; | |
786 | goto Unlock; | |
787 | } | |
3efa147a PM |
788 | } |
789 | ||
0c8454f5 | 790 | Check_image: |
d0941ead | 791 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
0c8454f5 | 792 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
1da177e4 | 793 | |
d0941ead | 794 | pr_debug("PM: Looking for hibernation image.\n"); |
ed746e3b RW |
795 | error = swsusp_check(); |
796 | if (error) | |
74dfd666 | 797 | goto Unlock; |
1da177e4 | 798 | |
0709db60 RW |
799 | /* The snapshot device should not be opened while we're running */ |
800 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
801 | error = -EBUSY; | |
76b57e61 | 802 | swsusp_close(FMODE_READ); |
0709db60 RW |
803 | goto Unlock; |
804 | } | |
805 | ||
5a0a2f30 | 806 | pm_prepare_console(); |
c3e94d89 AS |
807 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
808 | if (error) | |
76b57e61 | 809 | goto close_finish; |
c3e94d89 | 810 | |
7b5179ac | 811 | error = create_basic_memory_bitmaps(); |
1bfcf130 | 812 | if (error) |
76b57e61 | 813 | goto close_finish; |
1bfcf130 | 814 | |
74dfd666 | 815 | pr_debug("PM: Preparing processes for restore.\n"); |
03afed8b | 816 | error = freeze_processes(); |
ed746e3b | 817 | if (error) { |
c2dd0dae | 818 | swsusp_close(FMODE_READ); |
5a72e04d | 819 | goto Done; |
1da177e4 LT |
820 | } |
821 | ||
d0941ead | 822 | pr_debug("PM: Loading hibernation image.\n"); |
1da177e4 | 823 | |
a634cc10 | 824 | error = swsusp_read(&flags); |
76b57e61 | 825 | swsusp_close(FMODE_READ); |
ed746e3b | 826 | if (!error) |
a634cc10 | 827 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 828 | |
d0941ead | 829 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
7777fab9 | 830 | swsusp_free(); |
5a0a2f30 | 831 | thaw_processes(); |
1da177e4 | 832 | Done: |
7b5179ac | 833 | free_basic_memory_bitmaps(); |
0709db60 | 834 | Finish: |
c3e94d89 | 835 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 836 | pm_restore_console(); |
0709db60 | 837 | atomic_inc(&snapshot_device_available); |
dd5d666b | 838 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 839 | Unlock: |
a6d70980 | 840 | mutex_unlock(&pm_mutex); |
d0941ead | 841 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
7777fab9 | 842 | return error; |
76b57e61 JS |
843 | close_finish: |
844 | swsusp_close(FMODE_READ); | |
845 | goto Finish; | |
1da177e4 LT |
846 | } |
847 | ||
848 | late_initcall(software_resume); | |
849 | ||
850 | ||
a3d25c27 RW |
851 | static const char * const hibernation_modes[] = { |
852 | [HIBERNATION_PLATFORM] = "platform", | |
853 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
854 | [HIBERNATION_REBOOT] = "reboot", | |
62c552cc BS |
855 | #ifdef CONFIG_SUSPEND |
856 | [HIBERNATION_SUSPEND] = "suspend", | |
857 | #endif | |
1da177e4 LT |
858 | }; |
859 | ||
f42a9813 RW |
860 | /* |
861 | * /sys/power/disk - Control hibernation mode. | |
1da177e4 | 862 | * |
f42a9813 RW |
863 | * Hibernation can be handled in several ways. There are a few different ways |
864 | * to put the system into the sleep state: using the platform driver (e.g. ACPI | |
865 | * or other hibernation_ops), powering it off or rebooting it (for testing | |
48580ab8 | 866 | * mostly). |
1da177e4 | 867 | * |
f42a9813 RW |
868 | * The sysfs file /sys/power/disk provides an interface for selecting the |
869 | * hibernation mode to use. Reading from this file causes the available modes | |
48580ab8 | 870 | * to be printed. There are 3 modes that can be supported: |
1da177e4 | 871 | * |
1da177e4 LT |
872 | * 'platform' |
873 | * 'shutdown' | |
874 | * 'reboot' | |
875 | * | |
f42a9813 RW |
876 | * If a platform hibernation driver is in use, 'platform' will be supported |
877 | * and will be used by default. Otherwise, 'shutdown' will be used by default. | |
878 | * The selected option (i.e. the one corresponding to the current value of | |
879 | * hibernation_mode) is enclosed by a square bracket. | |
880 | * | |
881 | * To select a given hibernation mode it is necessary to write the mode's | |
882 | * string representation (as returned by reading from /sys/power/disk) back | |
883 | * into /sys/power/disk. | |
1da177e4 LT |
884 | */ |
885 | ||
386f275f KS |
886 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
887 | char *buf) | |
1da177e4 | 888 | { |
f0ced9b2 JB |
889 | int i; |
890 | char *start = buf; | |
891 | ||
a3d25c27 RW |
892 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
893 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
894 | continue; |
895 | switch (i) { | |
a3d25c27 RW |
896 | case HIBERNATION_SHUTDOWN: |
897 | case HIBERNATION_REBOOT: | |
62c552cc BS |
898 | #ifdef CONFIG_SUSPEND |
899 | case HIBERNATION_SUSPEND: | |
900 | #endif | |
f0ced9b2 | 901 | break; |
a3d25c27 RW |
902 | case HIBERNATION_PLATFORM: |
903 | if (hibernation_ops) | |
f0ced9b2 JB |
904 | break; |
905 | /* not a valid mode, continue with loop */ | |
906 | continue; | |
907 | } | |
a3d25c27 RW |
908 | if (i == hibernation_mode) |
909 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 910 | else |
a3d25c27 | 911 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
912 | } |
913 | buf += sprintf(buf, "\n"); | |
914 | return buf-start; | |
1da177e4 LT |
915 | } |
916 | ||
386f275f KS |
917 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
918 | const char *buf, size_t n) | |
1da177e4 LT |
919 | { |
920 | int error = 0; | |
921 | int i; | |
922 | int len; | |
923 | char *p; | |
a3d25c27 | 924 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
925 | |
926 | p = memchr(buf, '\n', n); | |
927 | len = p ? p - buf : n; | |
928 | ||
bcda53fa | 929 | lock_system_sleep(); |
a3d25c27 | 930 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
931 | if (len == strlen(hibernation_modes[i]) |
932 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
933 | mode = i; |
934 | break; | |
935 | } | |
936 | } | |
a3d25c27 | 937 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 938 | switch (mode) { |
a3d25c27 RW |
939 | case HIBERNATION_SHUTDOWN: |
940 | case HIBERNATION_REBOOT: | |
62c552cc BS |
941 | #ifdef CONFIG_SUSPEND |
942 | case HIBERNATION_SUSPEND: | |
943 | #endif | |
a3d25c27 | 944 | hibernation_mode = mode; |
fe0c935a | 945 | break; |
a3d25c27 RW |
946 | case HIBERNATION_PLATFORM: |
947 | if (hibernation_ops) | |
948 | hibernation_mode = mode; | |
1da177e4 LT |
949 | else |
950 | error = -EINVAL; | |
951 | } | |
a3d25c27 | 952 | } else |
1da177e4 LT |
953 | error = -EINVAL; |
954 | ||
a3d25c27 | 955 | if (!error) |
23976728 | 956 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 957 | hibernation_modes[mode]); |
bcda53fa | 958 | unlock_system_sleep(); |
1da177e4 LT |
959 | return error ? error : n; |
960 | } | |
961 | ||
962 | power_attr(disk); | |
963 | ||
386f275f KS |
964 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
965 | char *buf) | |
1da177e4 LT |
966 | { |
967 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
968 | MINOR(swsusp_resume_device)); | |
969 | } | |
970 | ||
386f275f KS |
971 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
972 | const char *buf, size_t n) | |
1da177e4 | 973 | { |
1da177e4 | 974 | unsigned int maj, min; |
1da177e4 | 975 | dev_t res; |
a576219a | 976 | int ret = -EINVAL; |
1da177e4 | 977 | |
a576219a AM |
978 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
979 | goto out; | |
1da177e4 | 980 | |
a576219a AM |
981 | res = MKDEV(maj,min); |
982 | if (maj != MAJOR(res) || min != MINOR(res)) | |
983 | goto out; | |
1da177e4 | 984 | |
bcda53fa | 985 | lock_system_sleep(); |
a576219a | 986 | swsusp_resume_device = res; |
bcda53fa | 987 | unlock_system_sleep(); |
23976728 | 988 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
989 | noresume = 0; |
990 | software_resume(); | |
991 | ret = n; | |
59a49335 | 992 | out: |
a576219a | 993 | return ret; |
1da177e4 LT |
994 | } |
995 | ||
996 | power_attr(resume); | |
997 | ||
386f275f KS |
998 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
999 | char *buf) | |
ca0aec0f | 1000 | { |
853609b6 | 1001 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
1002 | } |
1003 | ||
386f275f KS |
1004 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
1005 | const char *buf, size_t n) | |
ca0aec0f | 1006 | { |
853609b6 | 1007 | unsigned long size; |
ca0aec0f | 1008 | |
853609b6 | 1009 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
1010 | image_size = size; |
1011 | return n; | |
1012 | } | |
1013 | ||
1014 | return -EINVAL; | |
1015 | } | |
1016 | ||
1017 | power_attr(image_size); | |
1018 | ||
ddeb6487 RW |
1019 | static ssize_t reserved_size_show(struct kobject *kobj, |
1020 | struct kobj_attribute *attr, char *buf) | |
1021 | { | |
1022 | return sprintf(buf, "%lu\n", reserved_size); | |
1023 | } | |
1024 | ||
1025 | static ssize_t reserved_size_store(struct kobject *kobj, | |
1026 | struct kobj_attribute *attr, | |
1027 | const char *buf, size_t n) | |
1028 | { | |
1029 | unsigned long size; | |
1030 | ||
1031 | if (sscanf(buf, "%lu", &size) == 1) { | |
1032 | reserved_size = size; | |
1033 | return n; | |
1034 | } | |
1035 | ||
1036 | return -EINVAL; | |
1037 | } | |
1038 | ||
1039 | power_attr(reserved_size); | |
1040 | ||
1da177e4 LT |
1041 | static struct attribute * g[] = { |
1042 | &disk_attr.attr, | |
1043 | &resume_attr.attr, | |
ca0aec0f | 1044 | &image_size_attr.attr, |
ddeb6487 | 1045 | &reserved_size_attr.attr, |
1da177e4 LT |
1046 | NULL, |
1047 | }; | |
1048 | ||
1049 | ||
1050 | static struct attribute_group attr_group = { | |
1051 | .attrs = g, | |
1052 | }; | |
1053 | ||
1054 | ||
1055 | static int __init pm_disk_init(void) | |
1056 | { | |
d76e15fb | 1057 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | core_initcall(pm_disk_init); | |
1061 | ||
1062 | ||
1063 | static int __init resume_setup(char *str) | |
1064 | { | |
1065 | if (noresume) | |
1066 | return 1; | |
1067 | ||
1068 | strncpy( resume_file, str, 255 ); | |
1069 | return 1; | |
1070 | } | |
1071 | ||
9a154d9d RW |
1072 | static int __init resume_offset_setup(char *str) |
1073 | { | |
1074 | unsigned long long offset; | |
1075 | ||
1076 | if (noresume) | |
1077 | return 1; | |
1078 | ||
1079 | if (sscanf(str, "%llu", &offset) == 1) | |
1080 | swsusp_resume_block = offset; | |
1081 | ||
1082 | return 1; | |
1083 | } | |
1084 | ||
f996fc96 BS |
1085 | static int __init hibernate_setup(char *str) |
1086 | { | |
1087 | if (!strncmp(str, "noresume", 8)) | |
1088 | noresume = 1; | |
1089 | else if (!strncmp(str, "nocompress", 10)) | |
1090 | nocompress = 1; | |
1091 | return 1; | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | static int __init noresume_setup(char *str) |
1095 | { | |
1096 | noresume = 1; | |
1097 | return 1; | |
1098 | } | |
1099 | ||
6f8d7022 BS |
1100 | static int __init resumewait_setup(char *str) |
1101 | { | |
1102 | resume_wait = 1; | |
1103 | return 1; | |
1104 | } | |
1105 | ||
f126f733 BS |
1106 | static int __init resumedelay_setup(char *str) |
1107 | { | |
1108 | resume_delay = simple_strtoul(str, NULL, 0); | |
1109 | return 1; | |
1110 | } | |
1111 | ||
1da177e4 | 1112 | __setup("noresume", noresume_setup); |
9a154d9d | 1113 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 1114 | __setup("resume=", resume_setup); |
f996fc96 | 1115 | __setup("hibernate=", hibernate_setup); |
6f8d7022 | 1116 | __setup("resumewait", resumewait_setup); |
f126f733 | 1117 | __setup("resumedelay=", resumedelay_setup); |