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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kernel/power/disk.c - Suspend-to-disk support. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2004 Pavel Machek <pavel@suse.cz> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/suspend.h> | |
13 | #include <linux/syscalls.h> | |
14 | #include <linux/reboot.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/device.h> | |
1bfcf130 | 17 | #include <linux/kmod.h> |
1da177e4 LT |
18 | #include <linux/delay.h> |
19 | #include <linux/fs.h> | |
d53d9f16 | 20 | #include <linux/mount.h> |
88d10bba | 21 | #include <linux/pm.h> |
97c7801c | 22 | #include <linux/console.h> |
e3920fb4 | 23 | #include <linux/cpu.h> |
7dfb7103 | 24 | #include <linux/freezer.h> |
a8af7898 | 25 | #include <asm/suspend.h> |
d53d9f16 | 26 | |
1da177e4 LT |
27 | #include "power.h" |
28 | ||
29 | ||
1da177e4 | 30 | static int noresume = 0; |
47a460d5 | 31 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 32 | dev_t swsusp_resume_device; |
9a154d9d | 33 | sector_t swsusp_resume_block; |
1da177e4 | 34 | |
a3d25c27 RW |
35 | enum { |
36 | HIBERNATION_INVALID, | |
37 | HIBERNATION_PLATFORM, | |
38 | HIBERNATION_TEST, | |
39 | HIBERNATION_TESTPROC, | |
40 | HIBERNATION_SHUTDOWN, | |
41 | HIBERNATION_REBOOT, | |
42 | /* keep last */ | |
43 | __HIBERNATION_AFTER_LAST | |
44 | }; | |
45 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
46 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
47 | ||
48 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
49 | ||
b3dac3b3 | 50 | static struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
51 | |
52 | /** | |
53 | * hibernation_set_ops - set the global hibernate operations | |
54 | * @ops: the hibernation operations to use in subsequent hibernation transitions | |
55 | */ | |
56 | ||
b3dac3b3 | 57 | void hibernation_set_ops(struct platform_hibernation_ops *ops) |
a3d25c27 | 58 | { |
caea99ef RW |
59 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
60 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
74f270af | 61 | && ops->restore_cleanup)) { |
a3d25c27 RW |
62 | WARN_ON(1); |
63 | return; | |
64 | } | |
65 | mutex_lock(&pm_mutex); | |
66 | hibernation_ops = ops; | |
67 | if (ops) | |
68 | hibernation_mode = HIBERNATION_PLATFORM; | |
69 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
70 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
71 | ||
72 | mutex_unlock(&pm_mutex); | |
73 | } | |
74 | ||
abfe2d7b RW |
75 | static bool entering_platform_hibernation; |
76 | ||
77 | bool system_entering_hibernation(void) | |
78 | { | |
79 | return entering_platform_hibernation; | |
80 | } | |
81 | EXPORT_SYMBOL(system_entering_hibernation); | |
82 | ||
4cc79776 RW |
83 | #ifdef CONFIG_PM_DEBUG |
84 | static void hibernation_debug_sleep(void) | |
85 | { | |
86 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
87 | mdelay(5000); | |
88 | } | |
89 | ||
90 | static int hibernation_testmode(int mode) | |
91 | { | |
92 | if (hibernation_mode == mode) { | |
93 | hibernation_debug_sleep(); | |
94 | return 1; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int hibernation_test(int level) | |
100 | { | |
101 | if (pm_test_level == level) { | |
102 | hibernation_debug_sleep(); | |
103 | return 1; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | #else /* !CONFIG_PM_DEBUG */ | |
108 | static int hibernation_testmode(int mode) { return 0; } | |
109 | static int hibernation_test(int level) { return 0; } | |
110 | #endif /* !CONFIG_PM_DEBUG */ | |
111 | ||
74f270af | 112 | /** |
caea99ef | 113 | * platform_begin - tell the platform driver that we're starting |
74f270af RW |
114 | * hibernation |
115 | */ | |
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 | /** | |
124 | * platform_end - tell the platform driver that we've entered the | |
125 | * working state | |
126 | */ | |
127 | ||
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 | /** |
74f270af | 135 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
136 | * platform driver if so configured and return an error code if it fails |
137 | */ | |
138 | ||
74f270af | 139 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 140 | { |
7777fab9 | 141 | return (platform_mode && hibernation_ops) ? |
74f270af | 142 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 143 | } |
8a05aac2 | 144 | |
c7e0831d RW |
145 | /** |
146 | * platform_leave - prepare the machine for switching to the normal mode | |
147 | * of operation using the platform driver (called with interrupts disabled) | |
148 | */ | |
149 | ||
150 | static void platform_leave(int platform_mode) | |
151 | { | |
152 | if (platform_mode && hibernation_ops) | |
153 | hibernation_ops->leave(); | |
154 | } | |
155 | ||
a3d25c27 RW |
156 | /** |
157 | * platform_finish - switch the machine to the normal mode of operation | |
158 | * using the platform driver (must be called after platform_prepare()) | |
159 | */ | |
160 | ||
7777fab9 | 161 | static void platform_finish(int platform_mode) |
a3d25c27 | 162 | { |
7777fab9 | 163 | if (platform_mode && hibernation_ops) |
a3d25c27 | 164 | hibernation_ops->finish(); |
8a05aac2 SS |
165 | } |
166 | ||
a634cc10 RW |
167 | /** |
168 | * platform_pre_restore - prepare the platform for the restoration from a | |
169 | * hibernation image. If the restore fails after this function has been | |
170 | * called, platform_restore_cleanup() must be called. | |
171 | */ | |
172 | ||
173 | static int platform_pre_restore(int platform_mode) | |
174 | { | |
175 | return (platform_mode && hibernation_ops) ? | |
176 | hibernation_ops->pre_restore() : 0; | |
177 | } | |
178 | ||
179 | /** | |
180 | * platform_restore_cleanup - switch the platform to the normal mode of | |
181 | * operation after a failing restore. If platform_pre_restore() has been | |
182 | * called before the failing restore, this function must be called too, | |
183 | * regardless of the result of platform_pre_restore(). | |
184 | */ | |
185 | ||
186 | static void platform_restore_cleanup(int platform_mode) | |
187 | { | |
188 | if (platform_mode && hibernation_ops) | |
189 | hibernation_ops->restore_cleanup(); | |
190 | } | |
191 | ||
d8f3de0d RW |
192 | /** |
193 | * platform_recover - recover the platform from a failure to suspend | |
194 | * devices. | |
195 | */ | |
196 | ||
197 | static void platform_recover(int platform_mode) | |
198 | { | |
199 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
200 | hibernation_ops->recover(); | |
201 | } | |
202 | ||
c7e0831d RW |
203 | /** |
204 | * create_image - freeze devices that need to be frozen with interrupts | |
205 | * off, create the hibernation image and thaw those devices. Control | |
206 | * reappears in this routine after a restore. | |
207 | */ | |
208 | ||
47a460d5 | 209 | static int create_image(int platform_mode) |
c7e0831d RW |
210 | { |
211 | int error; | |
212 | ||
213 | error = arch_prepare_suspend(); | |
214 | if (error) | |
215 | return error; | |
216 | ||
1eede070 | 217 | device_pm_lock(); |
2ed8d2b3 | 218 | |
c7e0831d RW |
219 | /* At this point, device_suspend() has been called, but *not* |
220 | * device_power_down(). We *must* call device_power_down() now. | |
221 | * Otherwise, drivers for some devices (e.g. interrupt controllers) | |
222 | * become desynchronized with the actual state of the hardware | |
223 | * at resume time, and evil weirdness ensues. | |
224 | */ | |
225 | error = device_power_down(PMSG_FREEZE); | |
226 | if (error) { | |
23976728 RW |
227 | printk(KERN_ERR "PM: Some devices failed to power down, " |
228 | "aborting hibernation\n"); | |
2ed8d2b3 | 229 | goto Unlock; |
c7e0831d | 230 | } |
2ed8d2b3 | 231 | |
4aecd671 RW |
232 | error = platform_pre_snapshot(platform_mode); |
233 | if (error || hibernation_test(TEST_PLATFORM)) | |
234 | goto Platform_finish; | |
235 | ||
236 | error = disable_nonboot_cpus(); | |
237 | if (error || hibernation_test(TEST_CPUS) | |
238 | || hibernation_testmode(HIBERNATION_TEST)) | |
239 | goto Enable_cpus; | |
240 | ||
2ed8d2b3 RW |
241 | local_irq_disable(); |
242 | ||
770824bd RW |
243 | sysdev_suspend(PMSG_FREEZE); |
244 | if (error) { | |
245 | printk(KERN_ERR "PM: Some devices failed to power down, " | |
246 | "aborting hibernation\n"); | |
4aecd671 | 247 | goto Enable_irqs; |
770824bd | 248 | } |
c7e0831d | 249 | |
4cc79776 RW |
250 | if (hibernation_test(TEST_CORE)) |
251 | goto Power_up; | |
252 | ||
253 | in_suspend = 1; | |
c7e0831d RW |
254 | save_processor_state(); |
255 | error = swsusp_arch_suspend(); | |
256 | if (error) | |
23976728 RW |
257 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
258 | error); | |
c7e0831d RW |
259 | /* Restore control flow magically appears here */ |
260 | restore_processor_state(); | |
261 | if (!in_suspend) | |
262 | platform_leave(platform_mode); | |
4aecd671 | 263 | |
4cc79776 | 264 | Power_up: |
770824bd | 265 | sysdev_resume(); |
c7e0831d RW |
266 | /* NOTE: device_power_up() is just a resume() for devices |
267 | * that suspended with irqs off ... no overall powerup. | |
268 | */ | |
2ed8d2b3 | 269 | |
4aecd671 | 270 | Enable_irqs: |
2ed8d2b3 RW |
271 | local_irq_enable(); |
272 | ||
4aecd671 RW |
273 | Enable_cpus: |
274 | enable_nonboot_cpus(); | |
275 | ||
276 | Platform_finish: | |
277 | platform_finish(platform_mode); | |
278 | ||
1eede070 RW |
279 | device_power_up(in_suspend ? |
280 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
2ed8d2b3 RW |
281 | |
282 | Unlock: | |
1eede070 | 283 | device_pm_unlock(); |
2ed8d2b3 | 284 | |
c7e0831d RW |
285 | return error; |
286 | } | |
287 | ||
7777fab9 RW |
288 | /** |
289 | * hibernation_snapshot - quiesce devices and create the hibernation | |
290 | * snapshot image. | |
291 | * @platform_mode - if set, use the platform driver, if available, to | |
877d0310 | 292 | * prepare the platform firmware for the power transition. |
7777fab9 RW |
293 | * |
294 | * Must be called with pm_mutex held | |
295 | */ | |
296 | ||
297 | int hibernation_snapshot(int platform_mode) | |
298 | { | |
cbe2f5a6 | 299 | int error; |
7777fab9 | 300 | |
3fe0313e | 301 | error = platform_begin(platform_mode); |
7777fab9 | 302 | if (error) |
10a1803d | 303 | return error; |
7777fab9 | 304 | |
3fe0313e ZR |
305 | /* Free memory before shutting down devices. */ |
306 | error = swsusp_shrink_memory(); | |
74f270af | 307 | if (error) |
caea99ef | 308 | goto Close; |
74f270af | 309 | |
7777fab9 RW |
310 | suspend_console(); |
311 | error = device_suspend(PMSG_FREEZE); | |
10a1803d | 312 | if (error) |
d8f3de0d | 313 | goto Recover_platform; |
10a1803d | 314 | |
4cc79776 | 315 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 316 | goto Recover_platform; |
7777fab9 | 317 | |
4aecd671 RW |
318 | error = create_image(platform_mode); |
319 | /* Control returns here after successful restore */ | |
4cc79776 | 320 | |
4cc79776 | 321 | Resume_devices: |
1eede070 RW |
322 | device_resume(in_suspend ? |
323 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
7777fab9 | 324 | resume_console(); |
caea99ef RW |
325 | Close: |
326 | platform_end(platform_mode); | |
7777fab9 | 327 | return error; |
d8f3de0d RW |
328 | |
329 | Recover_platform: | |
330 | platform_recover(platform_mode); | |
331 | goto Resume_devices; | |
7777fab9 RW |
332 | } |
333 | ||
72df68ca RW |
334 | /** |
335 | * resume_target_kernel - prepare devices that need to be suspended with | |
336 | * interrupts off, restore the contents of highmem that have not been | |
337 | * restored yet from the image and run the low level code that will restore | |
338 | * the remaining contents of memory and switch to the just restored target | |
339 | * kernel. | |
340 | */ | |
341 | ||
4aecd671 | 342 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
343 | { |
344 | int error; | |
345 | ||
1eede070 | 346 | device_pm_lock(); |
2ed8d2b3 | 347 | |
1eede070 | 348 | error = device_power_down(PMSG_QUIESCE); |
72df68ca | 349 | if (error) { |
23976728 | 350 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 351 | "aborting resume\n"); |
2ed8d2b3 | 352 | goto Unlock; |
72df68ca | 353 | } |
2ed8d2b3 | 354 | |
4aecd671 RW |
355 | error = platform_pre_restore(platform_mode); |
356 | if (error) | |
357 | goto Cleanup; | |
358 | ||
359 | error = disable_nonboot_cpus(); | |
360 | if (error) | |
361 | goto Enable_cpus; | |
362 | ||
2ed8d2b3 RW |
363 | local_irq_disable(); |
364 | ||
4aecd671 RW |
365 | error = sysdev_suspend(PMSG_QUIESCE); |
366 | if (error) | |
367 | goto Enable_irqs; | |
368 | ||
72df68ca RW |
369 | /* We'll ignore saved state, but this gets preempt count (etc) right */ |
370 | save_processor_state(); | |
371 | error = restore_highmem(); | |
372 | if (!error) { | |
373 | error = swsusp_arch_resume(); | |
374 | /* | |
375 | * The code below is only ever reached in case of a failure. | |
376 | * Otherwise execution continues at place where | |
377 | * swsusp_arch_suspend() was called | |
378 | */ | |
379 | BUG_ON(!error); | |
380 | /* This call to restore_highmem() undos the previous one */ | |
381 | restore_highmem(); | |
382 | } | |
383 | /* | |
384 | * The only reason why swsusp_arch_resume() can fail is memory being | |
385 | * very tight, so we have to free it as soon as we can to avoid | |
386 | * subsequent failures | |
387 | */ | |
388 | swsusp_free(); | |
389 | restore_processor_state(); | |
390 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 391 | |
770824bd | 392 | sysdev_resume(); |
2ed8d2b3 | 393 | |
4aecd671 | 394 | Enable_irqs: |
72df68ca | 395 | local_irq_enable(); |
2ed8d2b3 | 396 | |
4aecd671 RW |
397 | Enable_cpus: |
398 | enable_nonboot_cpus(); | |
399 | ||
400 | Cleanup: | |
401 | platform_restore_cleanup(platform_mode); | |
402 | ||
2ed8d2b3 RW |
403 | device_power_up(PMSG_RECOVER); |
404 | ||
405 | Unlock: | |
1eede070 | 406 | device_pm_unlock(); |
2ed8d2b3 | 407 | |
72df68ca RW |
408 | return error; |
409 | } | |
410 | ||
7777fab9 RW |
411 | /** |
412 | * hibernation_restore - quiesce devices and restore the hibernation | |
413 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 | 414 | * @platform_mode - if set, use the platform driver, if available, to |
877d0310 | 415 | * prepare the platform firmware for the transition. |
7777fab9 RW |
416 | * |
417 | * Must be called with pm_mutex held | |
418 | */ | |
419 | ||
a634cc10 | 420 | int hibernation_restore(int platform_mode) |
7777fab9 | 421 | { |
cbe2f5a6 | 422 | int error; |
7777fab9 RW |
423 | |
424 | pm_prepare_console(); | |
425 | suspend_console(); | |
1eede070 | 426 | error = device_suspend(PMSG_QUIESCE); |
a634cc10 | 427 | if (!error) { |
4aecd671 RW |
428 | error = resume_target_kernel(platform_mode); |
429 | device_resume(PMSG_RECOVER); | |
a634cc10 | 430 | } |
7777fab9 RW |
431 | resume_console(); |
432 | pm_restore_console(); | |
433 | return error; | |
434 | } | |
435 | ||
436 | /** | |
437 | * hibernation_platform_enter - enter the hibernation state using the | |
438 | * platform driver (if available) | |
439 | */ | |
440 | ||
441 | int hibernation_platform_enter(void) | |
442 | { | |
cbe2f5a6 | 443 | int error; |
b1457bcc | 444 | |
9cd9a005 RW |
445 | if (!hibernation_ops) |
446 | return -ENOSYS; | |
447 | ||
448 | /* | |
449 | * We have cancelled the power transition by running | |
450 | * hibernation_ops->finish() before saving the image, so we should let | |
451 | * the firmware know that we're going to enter the sleep state after all | |
452 | */ | |
caea99ef | 453 | error = hibernation_ops->begin(); |
9cd9a005 | 454 | if (error) |
caea99ef | 455 | goto Close; |
9cd9a005 | 456 | |
abfe2d7b | 457 | entering_platform_hibernation = true; |
9cd9a005 | 458 | suspend_console(); |
3a2d5b70 | 459 | error = device_suspend(PMSG_HIBERNATE); |
d8f3de0d RW |
460 | if (error) { |
461 | if (hibernation_ops->recover) | |
462 | hibernation_ops->recover(); | |
463 | goto Resume_devices; | |
464 | } | |
9cd9a005 | 465 | |
4aecd671 RW |
466 | device_pm_lock(); |
467 | ||
468 | error = device_power_down(PMSG_HIBERNATE); | |
469 | if (error) | |
470 | goto Unlock; | |
471 | ||
9cd9a005 RW |
472 | error = hibernation_ops->prepare(); |
473 | if (error) | |
4aecd671 | 474 | goto Platofrm_finish; |
9cd9a005 RW |
475 | |
476 | error = disable_nonboot_cpus(); | |
477 | if (error) | |
4aecd671 | 478 | goto Platofrm_finish; |
2ed8d2b3 | 479 | |
4aecd671 RW |
480 | local_irq_disable(); |
481 | sysdev_suspend(PMSG_HIBERNATE); | |
482 | hibernation_ops->enter(); | |
483 | /* We should never get here */ | |
484 | while (1); | |
9cd9a005 RW |
485 | |
486 | /* | |
487 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
488 | * the system is going to be halted anyway. | |
489 | */ | |
4aecd671 | 490 | Platofrm_finish: |
9cd9a005 | 491 | hibernation_ops->finish(); |
2ed8d2b3 | 492 | |
4aecd671 RW |
493 | device_power_up(PMSG_RESTORE); |
494 | ||
495 | Unlock: | |
496 | device_pm_unlock(); | |
497 | ||
9cd9a005 | 498 | Resume_devices: |
abfe2d7b | 499 | entering_platform_hibernation = false; |
1eede070 | 500 | device_resume(PMSG_RESTORE); |
9cd9a005 | 501 | resume_console(); |
2ed8d2b3 | 502 | |
caea99ef RW |
503 | Close: |
504 | hibernation_ops->end(); | |
2ed8d2b3 | 505 | |
b1457bcc | 506 | return error; |
7777fab9 RW |
507 | } |
508 | ||
1da177e4 | 509 | /** |
a3d25c27 | 510 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 511 | * |
fe0c935a JB |
512 | * Use the platform driver, if configured so; otherwise try |
513 | * to power off or reboot. | |
1da177e4 LT |
514 | */ |
515 | ||
fe0c935a | 516 | static void power_down(void) |
1da177e4 | 517 | { |
a3d25c27 RW |
518 | switch (hibernation_mode) { |
519 | case HIBERNATION_TEST: | |
520 | case HIBERNATION_TESTPROC: | |
fe0c935a | 521 | break; |
a3d25c27 | 522 | case HIBERNATION_REBOOT: |
fdde86ac | 523 | kernel_restart(NULL); |
1da177e4 | 524 | break; |
a3d25c27 | 525 | case HIBERNATION_PLATFORM: |
7777fab9 | 526 | hibernation_platform_enter(); |
9cd9a005 RW |
527 | case HIBERNATION_SHUTDOWN: |
528 | kernel_power_off(); | |
529 | break; | |
1da177e4 | 530 | } |
fdde86ac | 531 | kernel_halt(); |
fe0c935a JB |
532 | /* |
533 | * Valid image is on the disk, if we continue we risk serious data | |
534 | * corruption after resume. | |
535 | */ | |
23976728 | 536 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
537 | while(1); |
538 | } | |
539 | ||
1da177e4 LT |
540 | static int prepare_processes(void) |
541 | { | |
b918f6e6 | 542 | int error = 0; |
1da177e4 | 543 | |
1da177e4 LT |
544 | if (freeze_processes()) { |
545 | error = -EBUSY; | |
5a0a2f30 | 546 | thaw_processes(); |
1da177e4 | 547 | } |
5a72e04d | 548 | return error; |
1da177e4 LT |
549 | } |
550 | ||
1da177e4 | 551 | /** |
a3d25c27 | 552 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
553 | */ |
554 | ||
a3d25c27 | 555 | int hibernate(void) |
1da177e4 LT |
556 | { |
557 | int error; | |
558 | ||
b10d9117 | 559 | mutex_lock(&pm_mutex); |
0709db60 | 560 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
561 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
562 | error = -EBUSY; | |
563 | goto Unlock; | |
564 | } | |
565 | ||
5a0a2f30 | 566 | pm_prepare_console(); |
b10d9117 RW |
567 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
568 | if (error) | |
569 | goto Exit; | |
0709db60 | 570 | |
1bfcf130 RW |
571 | error = usermodehelper_disable(); |
572 | if (error) | |
573 | goto Exit; | |
574 | ||
0709db60 RW |
575 | /* Allocate memory management structures */ |
576 | error = create_basic_memory_bitmaps(); | |
577 | if (error) | |
578 | goto Exit; | |
579 | ||
23976728 | 580 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
581 | sys_sync(); |
582 | printk("done.\n"); | |
583 | ||
1da177e4 | 584 | error = prepare_processes(); |
5a72e04d | 585 | if (error) |
0709db60 | 586 | goto Finish; |
1da177e4 | 587 | |
4cc79776 | 588 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 589 | goto Thaw; |
4cc79776 RW |
590 | |
591 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
592 | goto Thaw; | |
593 | ||
7777fab9 RW |
594 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
595 | if (in_suspend && !error) { | |
a634cc10 RW |
596 | unsigned int flags = 0; |
597 | ||
598 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
599 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 600 | pr_debug("PM: writing image.\n"); |
a634cc10 | 601 | error = swsusp_write(flags); |
7777fab9 | 602 | swsusp_free(); |
1da177e4 | 603 | if (!error) |
fe0c935a | 604 | power_down(); |
b918f6e6 | 605 | } else { |
1da177e4 | 606 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 607 | swsusp_free(); |
b918f6e6 | 608 | } |
b918f6e6 | 609 | Thaw: |
5a0a2f30 | 610 | thaw_processes(); |
0709db60 RW |
611 | Finish: |
612 | free_basic_memory_bitmaps(); | |
1bfcf130 | 613 | usermodehelper_enable(); |
0709db60 | 614 | Exit: |
b10d9117 | 615 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 616 | pm_restore_console(); |
0709db60 | 617 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
618 | Unlock: |
619 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
620 | return error; |
621 | } | |
622 | ||
623 | ||
624 | /** | |
625 | * software_resume - Resume from a saved image. | |
626 | * | |
627 | * Called as a late_initcall (so all devices are discovered and | |
628 | * initialized), we call swsusp to see if we have a saved image or not. | |
629 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 630 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
631 | * Otherwise, we fail gracefully and return to the normally |
632 | * scheduled program. | |
633 | * | |
634 | */ | |
635 | ||
636 | static int software_resume(void) | |
637 | { | |
638 | int error; | |
a634cc10 | 639 | unsigned int flags; |
1da177e4 | 640 | |
eed3ee08 AV |
641 | /* |
642 | * If the user said "noresume".. bail out early. | |
643 | */ | |
644 | if (noresume) | |
645 | return 0; | |
646 | ||
60a0d233 JB |
647 | /* |
648 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
649 | * is configured into the kernel. Since the regular hibernate | |
650 | * trigger path is via sysfs which takes a buffer mutex before | |
651 | * calling hibernate functions (which take pm_mutex) this can | |
652 | * cause lockdep to complain about a possible ABBA deadlock | |
653 | * which cannot happen since we're in the boot code here and | |
654 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
655 | * here to avoid lockdep complaining. | |
656 | */ | |
657 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
3efa147a | 658 | if (!swsusp_resume_device) { |
dd5d666b | 659 | if (!strlen(resume_file)) { |
a6d70980 | 660 | mutex_unlock(&pm_mutex); |
3efa147a | 661 | return -ENOENT; |
dd5d666b | 662 | } |
eed3ee08 AV |
663 | /* |
664 | * Some device discovery might still be in progress; we need | |
665 | * to wait for this to finish. | |
666 | */ | |
667 | wait_for_device_probe(); | |
3efa147a | 668 | swsusp_resume_device = name_to_dev_t(resume_file); |
23976728 | 669 | pr_debug("PM: Resume from partition %s\n", resume_file); |
3efa147a | 670 | } else { |
23976728 RW |
671 | pr_debug("PM: Resume from partition %d:%d\n", |
672 | MAJOR(swsusp_resume_device), | |
673 | MINOR(swsusp_resume_device)); | |
3efa147a PM |
674 | } |
675 | ||
1da177e4 LT |
676 | if (noresume) { |
677 | /** | |
9575809c RW |
678 | * FIXME: If noresume is specified, we need to find the |
679 | * partition and reset it back to normal swap space. | |
1da177e4 | 680 | */ |
a6d70980 | 681 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
682 | return 0; |
683 | } | |
684 | ||
23976728 | 685 | pr_debug("PM: Checking hibernation image.\n"); |
ed746e3b RW |
686 | error = swsusp_check(); |
687 | if (error) | |
74dfd666 | 688 | goto Unlock; |
1da177e4 | 689 | |
0709db60 RW |
690 | /* The snapshot device should not be opened while we're running */ |
691 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
692 | error = -EBUSY; | |
693 | goto Unlock; | |
694 | } | |
695 | ||
5a0a2f30 | 696 | pm_prepare_console(); |
c3e94d89 AS |
697 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
698 | if (error) | |
699 | goto Finish; | |
700 | ||
1bfcf130 RW |
701 | error = usermodehelper_disable(); |
702 | if (error) | |
703 | goto Finish; | |
704 | ||
74dfd666 RW |
705 | error = create_basic_memory_bitmaps(); |
706 | if (error) | |
0709db60 | 707 | goto Finish; |
1da177e4 | 708 | |
74dfd666 | 709 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
710 | error = prepare_processes(); |
711 | if (error) { | |
c2dd0dae | 712 | swsusp_close(FMODE_READ); |
5a72e04d | 713 | goto Done; |
1da177e4 LT |
714 | } |
715 | ||
23976728 | 716 | pr_debug("PM: Reading hibernation image.\n"); |
1da177e4 | 717 | |
a634cc10 | 718 | error = swsusp_read(&flags); |
ed746e3b | 719 | if (!error) |
a634cc10 | 720 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 721 | |
ed746e3b | 722 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 723 | swsusp_free(); |
5a0a2f30 | 724 | thaw_processes(); |
1da177e4 | 725 | Done: |
74dfd666 | 726 | free_basic_memory_bitmaps(); |
1bfcf130 | 727 | usermodehelper_enable(); |
0709db60 | 728 | Finish: |
c3e94d89 | 729 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 730 | pm_restore_console(); |
0709db60 | 731 | atomic_inc(&snapshot_device_available); |
dd5d666b | 732 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 733 | Unlock: |
a6d70980 | 734 | mutex_unlock(&pm_mutex); |
1da177e4 | 735 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 736 | return error; |
1da177e4 LT |
737 | } |
738 | ||
739 | late_initcall(software_resume); | |
740 | ||
741 | ||
a3d25c27 RW |
742 | static const char * const hibernation_modes[] = { |
743 | [HIBERNATION_PLATFORM] = "platform", | |
744 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
745 | [HIBERNATION_REBOOT] = "reboot", | |
746 | [HIBERNATION_TEST] = "test", | |
747 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
748 | }; |
749 | ||
750 | /** | |
a3d25c27 | 751 | * disk - Control hibernation mode |
1da177e4 | 752 | * |
11d77d0c JB |
753 | * Suspend-to-disk can be handled in several ways. We have a few options |
754 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
755 | * or other hibernation_ops), powering off the system or rebooting the |
756 | * system (for testing) as well as the two test modes. | |
1da177e4 | 757 | * |
11d77d0c | 758 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
759 | * encoded by the presence of hibernation_ops). However, the user may |
760 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
761 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
762 | * |
763 | * show() will display what the mode is currently set to. | |
764 | * store() will accept one of | |
765 | * | |
1da177e4 LT |
766 | * 'platform' |
767 | * 'shutdown' | |
768 | * 'reboot' | |
11d77d0c JB |
769 | * 'test' |
770 | * 'testproc' | |
1da177e4 | 771 | * |
11d77d0c | 772 | * It will only change to 'platform' if the system |
a3d25c27 | 773 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
774 | */ |
775 | ||
386f275f KS |
776 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
777 | char *buf) | |
1da177e4 | 778 | { |
f0ced9b2 JB |
779 | int i; |
780 | char *start = buf; | |
781 | ||
a3d25c27 RW |
782 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
783 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
784 | continue; |
785 | switch (i) { | |
a3d25c27 RW |
786 | case HIBERNATION_SHUTDOWN: |
787 | case HIBERNATION_REBOOT: | |
788 | case HIBERNATION_TEST: | |
789 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 790 | break; |
a3d25c27 RW |
791 | case HIBERNATION_PLATFORM: |
792 | if (hibernation_ops) | |
f0ced9b2 JB |
793 | break; |
794 | /* not a valid mode, continue with loop */ | |
795 | continue; | |
796 | } | |
a3d25c27 RW |
797 | if (i == hibernation_mode) |
798 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 799 | else |
a3d25c27 | 800 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
801 | } |
802 | buf += sprintf(buf, "\n"); | |
803 | return buf-start; | |
1da177e4 LT |
804 | } |
805 | ||
806 | ||
386f275f KS |
807 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
808 | const char *buf, size_t n) | |
1da177e4 LT |
809 | { |
810 | int error = 0; | |
811 | int i; | |
812 | int len; | |
813 | char *p; | |
a3d25c27 | 814 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
815 | |
816 | p = memchr(buf, '\n', n); | |
817 | len = p ? p - buf : n; | |
818 | ||
a6d70980 | 819 | mutex_lock(&pm_mutex); |
a3d25c27 | 820 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
821 | if (len == strlen(hibernation_modes[i]) |
822 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
823 | mode = i; |
824 | break; | |
825 | } | |
826 | } | |
a3d25c27 | 827 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 828 | switch (mode) { |
a3d25c27 RW |
829 | case HIBERNATION_SHUTDOWN: |
830 | case HIBERNATION_REBOOT: | |
831 | case HIBERNATION_TEST: | |
832 | case HIBERNATION_TESTPROC: | |
833 | hibernation_mode = mode; | |
fe0c935a | 834 | break; |
a3d25c27 RW |
835 | case HIBERNATION_PLATFORM: |
836 | if (hibernation_ops) | |
837 | hibernation_mode = mode; | |
1da177e4 LT |
838 | else |
839 | error = -EINVAL; | |
840 | } | |
a3d25c27 | 841 | } else |
1da177e4 LT |
842 | error = -EINVAL; |
843 | ||
a3d25c27 | 844 | if (!error) |
23976728 | 845 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 846 | hibernation_modes[mode]); |
a6d70980 | 847 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
848 | return error ? error : n; |
849 | } | |
850 | ||
851 | power_attr(disk); | |
852 | ||
386f275f KS |
853 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
854 | char *buf) | |
1da177e4 LT |
855 | { |
856 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
857 | MINOR(swsusp_resume_device)); | |
858 | } | |
859 | ||
386f275f KS |
860 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
861 | const char *buf, size_t n) | |
1da177e4 | 862 | { |
1da177e4 | 863 | unsigned int maj, min; |
1da177e4 | 864 | dev_t res; |
a576219a | 865 | int ret = -EINVAL; |
1da177e4 | 866 | |
a576219a AM |
867 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
868 | goto out; | |
1da177e4 | 869 | |
a576219a AM |
870 | res = MKDEV(maj,min); |
871 | if (maj != MAJOR(res) || min != MINOR(res)) | |
872 | goto out; | |
1da177e4 | 873 | |
a6d70980 | 874 | mutex_lock(&pm_mutex); |
a576219a | 875 | swsusp_resume_device = res; |
a6d70980 | 876 | mutex_unlock(&pm_mutex); |
23976728 | 877 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
878 | noresume = 0; |
879 | software_resume(); | |
880 | ret = n; | |
59a49335 | 881 | out: |
a576219a | 882 | return ret; |
1da177e4 LT |
883 | } |
884 | ||
885 | power_attr(resume); | |
886 | ||
386f275f KS |
887 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
888 | char *buf) | |
ca0aec0f | 889 | { |
853609b6 | 890 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
891 | } |
892 | ||
386f275f KS |
893 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
894 | const char *buf, size_t n) | |
ca0aec0f | 895 | { |
853609b6 | 896 | unsigned long size; |
ca0aec0f | 897 | |
853609b6 | 898 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
899 | image_size = size; |
900 | return n; | |
901 | } | |
902 | ||
903 | return -EINVAL; | |
904 | } | |
905 | ||
906 | power_attr(image_size); | |
907 | ||
1da177e4 LT |
908 | static struct attribute * g[] = { |
909 | &disk_attr.attr, | |
910 | &resume_attr.attr, | |
ca0aec0f | 911 | &image_size_attr.attr, |
1da177e4 LT |
912 | NULL, |
913 | }; | |
914 | ||
915 | ||
916 | static struct attribute_group attr_group = { | |
917 | .attrs = g, | |
918 | }; | |
919 | ||
920 | ||
921 | static int __init pm_disk_init(void) | |
922 | { | |
d76e15fb | 923 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
924 | } |
925 | ||
926 | core_initcall(pm_disk_init); | |
927 | ||
928 | ||
929 | static int __init resume_setup(char *str) | |
930 | { | |
931 | if (noresume) | |
932 | return 1; | |
933 | ||
934 | strncpy( resume_file, str, 255 ); | |
935 | return 1; | |
936 | } | |
937 | ||
9a154d9d RW |
938 | static int __init resume_offset_setup(char *str) |
939 | { | |
940 | unsigned long long offset; | |
941 | ||
942 | if (noresume) | |
943 | return 1; | |
944 | ||
945 | if (sscanf(str, "%llu", &offset) == 1) | |
946 | swsusp_resume_block = offset; | |
947 | ||
948 | return 1; | |
949 | } | |
950 | ||
1da177e4 LT |
951 | static int __init noresume_setup(char *str) |
952 | { | |
953 | noresume = 1; | |
954 | return 1; | |
955 | } | |
956 | ||
957 | __setup("noresume", noresume_setup); | |
9a154d9d | 958 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 959 | __setup("resume=", resume_setup); |