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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> |
c7510859 | 25 | #include <scsi/scsi_scan.h> |
a8af7898 | 26 | #include <asm/suspend.h> |
d53d9f16 | 27 | |
1da177e4 LT |
28 | #include "power.h" |
29 | ||
30 | ||
1da177e4 | 31 | static int noresume = 0; |
47a460d5 | 32 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 33 | dev_t swsusp_resume_device; |
9a154d9d | 34 | sector_t swsusp_resume_block; |
1da177e4 | 35 | |
a3d25c27 RW |
36 | enum { |
37 | HIBERNATION_INVALID, | |
38 | HIBERNATION_PLATFORM, | |
39 | HIBERNATION_TEST, | |
40 | HIBERNATION_TESTPROC, | |
41 | HIBERNATION_SHUTDOWN, | |
42 | HIBERNATION_REBOOT, | |
43 | /* keep last */ | |
44 | __HIBERNATION_AFTER_LAST | |
45 | }; | |
46 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
47 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
48 | ||
49 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
50 | ||
b3dac3b3 | 51 | static struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
52 | |
53 | /** | |
54 | * hibernation_set_ops - set the global hibernate operations | |
55 | * @ops: the hibernation operations to use in subsequent hibernation transitions | |
56 | */ | |
57 | ||
b3dac3b3 | 58 | void hibernation_set_ops(struct platform_hibernation_ops *ops) |
a3d25c27 | 59 | { |
caea99ef RW |
60 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
61 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
74f270af | 62 | && ops->restore_cleanup)) { |
a3d25c27 RW |
63 | WARN_ON(1); |
64 | return; | |
65 | } | |
66 | mutex_lock(&pm_mutex); | |
67 | hibernation_ops = ops; | |
68 | if (ops) | |
69 | hibernation_mode = HIBERNATION_PLATFORM; | |
70 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
71 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
72 | ||
73 | mutex_unlock(&pm_mutex); | |
74 | } | |
75 | ||
abfe2d7b RW |
76 | static bool entering_platform_hibernation; |
77 | ||
78 | bool system_entering_hibernation(void) | |
79 | { | |
80 | return entering_platform_hibernation; | |
81 | } | |
82 | EXPORT_SYMBOL(system_entering_hibernation); | |
83 | ||
4cc79776 RW |
84 | #ifdef CONFIG_PM_DEBUG |
85 | static void hibernation_debug_sleep(void) | |
86 | { | |
87 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
88 | mdelay(5000); | |
89 | } | |
90 | ||
91 | static int hibernation_testmode(int mode) | |
92 | { | |
93 | if (hibernation_mode == mode) { | |
94 | hibernation_debug_sleep(); | |
95 | return 1; | |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static int hibernation_test(int level) | |
101 | { | |
102 | if (pm_test_level == level) { | |
103 | hibernation_debug_sleep(); | |
104 | return 1; | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | #else /* !CONFIG_PM_DEBUG */ | |
109 | static int hibernation_testmode(int mode) { return 0; } | |
110 | static int hibernation_test(int level) { return 0; } | |
111 | #endif /* !CONFIG_PM_DEBUG */ | |
112 | ||
74f270af | 113 | /** |
caea99ef | 114 | * platform_begin - tell the platform driver that we're starting |
74f270af RW |
115 | * hibernation |
116 | */ | |
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 | /** | |
125 | * platform_end - tell the platform driver that we've entered the | |
126 | * working state | |
127 | */ | |
128 | ||
129 | static void platform_end(int platform_mode) | |
130 | { | |
131 | if (platform_mode && hibernation_ops) | |
132 | hibernation_ops->end(); | |
74f270af | 133 | } |
a3d25c27 | 134 | |
8a05aac2 | 135 | /** |
74f270af | 136 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
137 | * platform driver if so configured and return an error code if it fails |
138 | */ | |
139 | ||
74f270af | 140 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 141 | { |
7777fab9 | 142 | return (platform_mode && hibernation_ops) ? |
74f270af | 143 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 144 | } |
8a05aac2 | 145 | |
c7e0831d RW |
146 | /** |
147 | * platform_leave - prepare the machine for switching to the normal mode | |
148 | * of operation using the platform driver (called with interrupts disabled) | |
149 | */ | |
150 | ||
151 | static void platform_leave(int platform_mode) | |
152 | { | |
153 | if (platform_mode && hibernation_ops) | |
154 | hibernation_ops->leave(); | |
155 | } | |
156 | ||
a3d25c27 RW |
157 | /** |
158 | * platform_finish - switch the machine to the normal mode of operation | |
159 | * using the platform driver (must be called after platform_prepare()) | |
160 | */ | |
161 | ||
7777fab9 | 162 | static void platform_finish(int platform_mode) |
a3d25c27 | 163 | { |
7777fab9 | 164 | if (platform_mode && hibernation_ops) |
a3d25c27 | 165 | hibernation_ops->finish(); |
8a05aac2 SS |
166 | } |
167 | ||
a634cc10 RW |
168 | /** |
169 | * platform_pre_restore - prepare the platform for the restoration from a | |
170 | * hibernation image. If the restore fails after this function has been | |
171 | * called, platform_restore_cleanup() must be called. | |
172 | */ | |
173 | ||
174 | static int platform_pre_restore(int platform_mode) | |
175 | { | |
176 | return (platform_mode && hibernation_ops) ? | |
177 | hibernation_ops->pre_restore() : 0; | |
178 | } | |
179 | ||
180 | /** | |
181 | * platform_restore_cleanup - switch the platform to the normal mode of | |
182 | * operation after a failing restore. If platform_pre_restore() has been | |
183 | * called before the failing restore, this function must be called too, | |
184 | * regardless of the result of platform_pre_restore(). | |
185 | */ | |
186 | ||
187 | static void platform_restore_cleanup(int platform_mode) | |
188 | { | |
189 | if (platform_mode && hibernation_ops) | |
190 | hibernation_ops->restore_cleanup(); | |
191 | } | |
192 | ||
d8f3de0d RW |
193 | /** |
194 | * platform_recover - recover the platform from a failure to suspend | |
195 | * devices. | |
196 | */ | |
197 | ||
198 | static void platform_recover(int platform_mode) | |
199 | { | |
200 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
201 | hibernation_ops->recover(); | |
202 | } | |
203 | ||
c7e0831d RW |
204 | /** |
205 | * create_image - freeze devices that need to be frozen with interrupts | |
206 | * off, create the hibernation image and thaw those devices. Control | |
207 | * reappears in this routine after a restore. | |
208 | */ | |
209 | ||
47a460d5 | 210 | static int create_image(int platform_mode) |
c7e0831d RW |
211 | { |
212 | int error; | |
213 | ||
214 | error = arch_prepare_suspend(); | |
215 | if (error) | |
216 | return error; | |
217 | ||
1eede070 | 218 | device_pm_lock(); |
2ed8d2b3 | 219 | |
c7e0831d RW |
220 | /* At this point, device_suspend() has been called, but *not* |
221 | * device_power_down(). We *must* call device_power_down() now. | |
222 | * Otherwise, drivers for some devices (e.g. interrupt controllers) | |
223 | * become desynchronized with the actual state of the hardware | |
224 | * at resume time, and evil weirdness ensues. | |
225 | */ | |
226 | error = device_power_down(PMSG_FREEZE); | |
227 | if (error) { | |
23976728 RW |
228 | printk(KERN_ERR "PM: Some devices failed to power down, " |
229 | "aborting hibernation\n"); | |
2ed8d2b3 | 230 | goto Unlock; |
c7e0831d | 231 | } |
2ed8d2b3 | 232 | |
4aecd671 RW |
233 | error = platform_pre_snapshot(platform_mode); |
234 | if (error || hibernation_test(TEST_PLATFORM)) | |
235 | goto Platform_finish; | |
236 | ||
237 | error = disable_nonboot_cpus(); | |
238 | if (error || hibernation_test(TEST_CPUS) | |
239 | || hibernation_testmode(HIBERNATION_TEST)) | |
240 | goto Enable_cpus; | |
241 | ||
2ed8d2b3 RW |
242 | local_irq_disable(); |
243 | ||
770824bd RW |
244 | sysdev_suspend(PMSG_FREEZE); |
245 | if (error) { | |
246 | printk(KERN_ERR "PM: Some devices failed to power down, " | |
247 | "aborting hibernation\n"); | |
4aecd671 | 248 | goto Enable_irqs; |
770824bd | 249 | } |
c7e0831d | 250 | |
4cc79776 RW |
251 | if (hibernation_test(TEST_CORE)) |
252 | goto Power_up; | |
253 | ||
254 | in_suspend = 1; | |
c7e0831d RW |
255 | save_processor_state(); |
256 | error = swsusp_arch_suspend(); | |
257 | if (error) | |
23976728 RW |
258 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
259 | error); | |
c7e0831d RW |
260 | /* Restore control flow magically appears here */ |
261 | restore_processor_state(); | |
262 | if (!in_suspend) | |
263 | platform_leave(platform_mode); | |
4aecd671 | 264 | |
4cc79776 | 265 | Power_up: |
770824bd | 266 | sysdev_resume(); |
c7e0831d RW |
267 | /* NOTE: device_power_up() is just a resume() for devices |
268 | * that suspended with irqs off ... no overall powerup. | |
269 | */ | |
2ed8d2b3 | 270 | |
4aecd671 | 271 | Enable_irqs: |
2ed8d2b3 RW |
272 | local_irq_enable(); |
273 | ||
4aecd671 RW |
274 | Enable_cpus: |
275 | enable_nonboot_cpus(); | |
276 | ||
277 | Platform_finish: | |
278 | platform_finish(platform_mode); | |
279 | ||
1eede070 RW |
280 | device_power_up(in_suspend ? |
281 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
2ed8d2b3 RW |
282 | |
283 | Unlock: | |
1eede070 | 284 | device_pm_unlock(); |
2ed8d2b3 | 285 | |
c7e0831d RW |
286 | return error; |
287 | } | |
288 | ||
7777fab9 RW |
289 | /** |
290 | * hibernation_snapshot - quiesce devices and create the hibernation | |
291 | * snapshot image. | |
292 | * @platform_mode - if set, use the platform driver, if available, to | |
877d0310 | 293 | * prepare the platform firmware for the power transition. |
7777fab9 RW |
294 | * |
295 | * Must be called with pm_mutex held | |
296 | */ | |
297 | ||
298 | int hibernation_snapshot(int platform_mode) | |
299 | { | |
cbe2f5a6 | 300 | int error; |
7777fab9 | 301 | |
3fe0313e | 302 | error = platform_begin(platform_mode); |
7777fab9 | 303 | if (error) |
10a1803d | 304 | return error; |
7777fab9 | 305 | |
3fe0313e ZR |
306 | /* Free memory before shutting down devices. */ |
307 | error = swsusp_shrink_memory(); | |
74f270af | 308 | if (error) |
caea99ef | 309 | goto Close; |
74f270af | 310 | |
7777fab9 RW |
311 | suspend_console(); |
312 | error = device_suspend(PMSG_FREEZE); | |
10a1803d | 313 | if (error) |
d8f3de0d | 314 | goto Recover_platform; |
10a1803d | 315 | |
4cc79776 | 316 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 317 | goto Recover_platform; |
7777fab9 | 318 | |
4aecd671 RW |
319 | error = create_image(platform_mode); |
320 | /* Control returns here after successful restore */ | |
4cc79776 | 321 | |
4cc79776 | 322 | Resume_devices: |
1eede070 RW |
323 | device_resume(in_suspend ? |
324 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
7777fab9 | 325 | resume_console(); |
caea99ef RW |
326 | Close: |
327 | platform_end(platform_mode); | |
7777fab9 | 328 | return error; |
d8f3de0d RW |
329 | |
330 | Recover_platform: | |
331 | platform_recover(platform_mode); | |
332 | goto Resume_devices; | |
7777fab9 RW |
333 | } |
334 | ||
72df68ca RW |
335 | /** |
336 | * resume_target_kernel - prepare devices that need to be suspended with | |
337 | * interrupts off, restore the contents of highmem that have not been | |
338 | * restored yet from the image and run the low level code that will restore | |
339 | * the remaining contents of memory and switch to the just restored target | |
340 | * kernel. | |
341 | */ | |
342 | ||
4aecd671 | 343 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
344 | { |
345 | int error; | |
346 | ||
1eede070 | 347 | device_pm_lock(); |
2ed8d2b3 | 348 | |
1eede070 | 349 | error = device_power_down(PMSG_QUIESCE); |
72df68ca | 350 | if (error) { |
23976728 | 351 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 352 | "aborting resume\n"); |
2ed8d2b3 | 353 | goto Unlock; |
72df68ca | 354 | } |
2ed8d2b3 | 355 | |
4aecd671 RW |
356 | error = platform_pre_restore(platform_mode); |
357 | if (error) | |
358 | goto Cleanup; | |
359 | ||
360 | error = disable_nonboot_cpus(); | |
361 | if (error) | |
362 | goto Enable_cpus; | |
363 | ||
2ed8d2b3 RW |
364 | local_irq_disable(); |
365 | ||
4aecd671 RW |
366 | error = sysdev_suspend(PMSG_QUIESCE); |
367 | if (error) | |
368 | goto Enable_irqs; | |
369 | ||
72df68ca RW |
370 | /* We'll ignore saved state, but this gets preempt count (etc) right */ |
371 | save_processor_state(); | |
372 | error = restore_highmem(); | |
373 | if (!error) { | |
374 | error = swsusp_arch_resume(); | |
375 | /* | |
376 | * The code below is only ever reached in case of a failure. | |
377 | * Otherwise execution continues at place where | |
378 | * swsusp_arch_suspend() was called | |
379 | */ | |
380 | BUG_ON(!error); | |
381 | /* This call to restore_highmem() undos the previous one */ | |
382 | restore_highmem(); | |
383 | } | |
384 | /* | |
385 | * The only reason why swsusp_arch_resume() can fail is memory being | |
386 | * very tight, so we have to free it as soon as we can to avoid | |
387 | * subsequent failures | |
388 | */ | |
389 | swsusp_free(); | |
390 | restore_processor_state(); | |
391 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 392 | |
770824bd | 393 | sysdev_resume(); |
2ed8d2b3 | 394 | |
4aecd671 | 395 | Enable_irqs: |
72df68ca | 396 | local_irq_enable(); |
2ed8d2b3 | 397 | |
4aecd671 RW |
398 | Enable_cpus: |
399 | enable_nonboot_cpus(); | |
400 | ||
401 | Cleanup: | |
402 | platform_restore_cleanup(platform_mode); | |
403 | ||
2ed8d2b3 RW |
404 | device_power_up(PMSG_RECOVER); |
405 | ||
406 | Unlock: | |
1eede070 | 407 | device_pm_unlock(); |
2ed8d2b3 | 408 | |
72df68ca RW |
409 | return error; |
410 | } | |
411 | ||
7777fab9 RW |
412 | /** |
413 | * hibernation_restore - quiesce devices and restore the hibernation | |
414 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 | 415 | * @platform_mode - if set, use the platform driver, if available, to |
877d0310 | 416 | * prepare the platform firmware for the transition. |
7777fab9 RW |
417 | * |
418 | * Must be called with pm_mutex held | |
419 | */ | |
420 | ||
a634cc10 | 421 | int hibernation_restore(int platform_mode) |
7777fab9 | 422 | { |
cbe2f5a6 | 423 | int error; |
7777fab9 RW |
424 | |
425 | pm_prepare_console(); | |
426 | suspend_console(); | |
1eede070 | 427 | error = device_suspend(PMSG_QUIESCE); |
a634cc10 | 428 | if (!error) { |
4aecd671 RW |
429 | error = resume_target_kernel(platform_mode); |
430 | device_resume(PMSG_RECOVER); | |
a634cc10 | 431 | } |
7777fab9 RW |
432 | resume_console(); |
433 | pm_restore_console(); | |
434 | return error; | |
435 | } | |
436 | ||
437 | /** | |
438 | * hibernation_platform_enter - enter the hibernation state using the | |
439 | * platform driver (if available) | |
440 | */ | |
441 | ||
442 | int hibernation_platform_enter(void) | |
443 | { | |
cbe2f5a6 | 444 | int error; |
b1457bcc | 445 | |
9cd9a005 RW |
446 | if (!hibernation_ops) |
447 | return -ENOSYS; | |
448 | ||
449 | /* | |
450 | * We have cancelled the power transition by running | |
451 | * hibernation_ops->finish() before saving the image, so we should let | |
452 | * the firmware know that we're going to enter the sleep state after all | |
453 | */ | |
caea99ef | 454 | error = hibernation_ops->begin(); |
9cd9a005 | 455 | if (error) |
caea99ef | 456 | goto Close; |
9cd9a005 | 457 | |
abfe2d7b | 458 | entering_platform_hibernation = true; |
9cd9a005 | 459 | suspend_console(); |
3a2d5b70 | 460 | error = device_suspend(PMSG_HIBERNATE); |
d8f3de0d RW |
461 | if (error) { |
462 | if (hibernation_ops->recover) | |
463 | hibernation_ops->recover(); | |
464 | goto Resume_devices; | |
465 | } | |
9cd9a005 | 466 | |
4aecd671 RW |
467 | device_pm_lock(); |
468 | ||
469 | error = device_power_down(PMSG_HIBERNATE); | |
470 | if (error) | |
471 | goto Unlock; | |
472 | ||
9cd9a005 RW |
473 | error = hibernation_ops->prepare(); |
474 | if (error) | |
4aecd671 | 475 | goto Platofrm_finish; |
9cd9a005 RW |
476 | |
477 | error = disable_nonboot_cpus(); | |
478 | if (error) | |
4aecd671 | 479 | goto Platofrm_finish; |
2ed8d2b3 | 480 | |
4aecd671 RW |
481 | local_irq_disable(); |
482 | sysdev_suspend(PMSG_HIBERNATE); | |
483 | hibernation_ops->enter(); | |
484 | /* We should never get here */ | |
485 | while (1); | |
9cd9a005 RW |
486 | |
487 | /* | |
488 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
489 | * the system is going to be halted anyway. | |
490 | */ | |
4aecd671 | 491 | Platofrm_finish: |
9cd9a005 | 492 | hibernation_ops->finish(); |
2ed8d2b3 | 493 | |
4aecd671 RW |
494 | device_power_up(PMSG_RESTORE); |
495 | ||
496 | Unlock: | |
497 | device_pm_unlock(); | |
498 | ||
9cd9a005 | 499 | Resume_devices: |
abfe2d7b | 500 | entering_platform_hibernation = false; |
1eede070 | 501 | device_resume(PMSG_RESTORE); |
9cd9a005 | 502 | resume_console(); |
2ed8d2b3 | 503 | |
caea99ef RW |
504 | Close: |
505 | hibernation_ops->end(); | |
2ed8d2b3 | 506 | |
b1457bcc | 507 | return error; |
7777fab9 RW |
508 | } |
509 | ||
1da177e4 | 510 | /** |
a3d25c27 | 511 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 512 | * |
fe0c935a JB |
513 | * Use the platform driver, if configured so; otherwise try |
514 | * to power off or reboot. | |
1da177e4 LT |
515 | */ |
516 | ||
fe0c935a | 517 | static void power_down(void) |
1da177e4 | 518 | { |
a3d25c27 RW |
519 | switch (hibernation_mode) { |
520 | case HIBERNATION_TEST: | |
521 | case HIBERNATION_TESTPROC: | |
fe0c935a | 522 | break; |
a3d25c27 | 523 | case HIBERNATION_REBOOT: |
fdde86ac | 524 | kernel_restart(NULL); |
1da177e4 | 525 | break; |
a3d25c27 | 526 | case HIBERNATION_PLATFORM: |
7777fab9 | 527 | hibernation_platform_enter(); |
9cd9a005 RW |
528 | case HIBERNATION_SHUTDOWN: |
529 | kernel_power_off(); | |
530 | break; | |
1da177e4 | 531 | } |
fdde86ac | 532 | kernel_halt(); |
fe0c935a JB |
533 | /* |
534 | * Valid image is on the disk, if we continue we risk serious data | |
535 | * corruption after resume. | |
536 | */ | |
23976728 | 537 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
538 | while(1); |
539 | } | |
540 | ||
1da177e4 LT |
541 | static int prepare_processes(void) |
542 | { | |
b918f6e6 | 543 | int error = 0; |
1da177e4 | 544 | |
1da177e4 LT |
545 | if (freeze_processes()) { |
546 | error = -EBUSY; | |
5a0a2f30 | 547 | thaw_processes(); |
1da177e4 | 548 | } |
5a72e04d | 549 | return error; |
1da177e4 LT |
550 | } |
551 | ||
1da177e4 | 552 | /** |
a3d25c27 | 553 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
554 | */ |
555 | ||
a3d25c27 | 556 | int hibernate(void) |
1da177e4 LT |
557 | { |
558 | int error; | |
559 | ||
b10d9117 | 560 | mutex_lock(&pm_mutex); |
0709db60 | 561 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
562 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
563 | error = -EBUSY; | |
564 | goto Unlock; | |
565 | } | |
566 | ||
5a0a2f30 | 567 | pm_prepare_console(); |
b10d9117 RW |
568 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
569 | if (error) | |
570 | goto Exit; | |
0709db60 | 571 | |
1bfcf130 RW |
572 | error = usermodehelper_disable(); |
573 | if (error) | |
574 | goto Exit; | |
575 | ||
0709db60 RW |
576 | /* Allocate memory management structures */ |
577 | error = create_basic_memory_bitmaps(); | |
578 | if (error) | |
579 | goto Exit; | |
580 | ||
23976728 | 581 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
582 | sys_sync(); |
583 | printk("done.\n"); | |
584 | ||
1da177e4 | 585 | error = prepare_processes(); |
5a72e04d | 586 | if (error) |
0709db60 | 587 | goto Finish; |
1da177e4 | 588 | |
4cc79776 | 589 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 590 | goto Thaw; |
4cc79776 RW |
591 | |
592 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
593 | goto Thaw; | |
594 | ||
7777fab9 RW |
595 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
596 | if (in_suspend && !error) { | |
a634cc10 RW |
597 | unsigned int flags = 0; |
598 | ||
599 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
600 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 601 | pr_debug("PM: writing image.\n"); |
a634cc10 | 602 | error = swsusp_write(flags); |
7777fab9 | 603 | swsusp_free(); |
1da177e4 | 604 | if (!error) |
fe0c935a | 605 | power_down(); |
b918f6e6 | 606 | } else { |
1da177e4 | 607 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 608 | swsusp_free(); |
b918f6e6 | 609 | } |
b918f6e6 | 610 | Thaw: |
5a0a2f30 | 611 | thaw_processes(); |
0709db60 RW |
612 | Finish: |
613 | free_basic_memory_bitmaps(); | |
1bfcf130 | 614 | usermodehelper_enable(); |
0709db60 | 615 | Exit: |
b10d9117 | 616 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 617 | pm_restore_console(); |
0709db60 | 618 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
619 | Unlock: |
620 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
621 | return error; |
622 | } | |
623 | ||
624 | ||
625 | /** | |
626 | * software_resume - Resume from a saved image. | |
627 | * | |
628 | * Called as a late_initcall (so all devices are discovered and | |
629 | * initialized), we call swsusp to see if we have a saved image or not. | |
630 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 631 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
632 | * Otherwise, we fail gracefully and return to the normally |
633 | * scheduled program. | |
634 | * | |
635 | */ | |
636 | ||
637 | static int software_resume(void) | |
638 | { | |
639 | int error; | |
a634cc10 | 640 | unsigned int flags; |
1da177e4 | 641 | |
eed3ee08 AV |
642 | /* |
643 | * If the user said "noresume".. bail out early. | |
644 | */ | |
645 | if (noresume) | |
646 | return 0; | |
647 | ||
60a0d233 JB |
648 | /* |
649 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
650 | * is configured into the kernel. Since the regular hibernate | |
651 | * trigger path is via sysfs which takes a buffer mutex before | |
652 | * calling hibernate functions (which take pm_mutex) this can | |
653 | * cause lockdep to complain about a possible ABBA deadlock | |
654 | * which cannot happen since we're in the boot code here and | |
655 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
656 | * here to avoid lockdep complaining. | |
657 | */ | |
658 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
659 | |
660 | if (swsusp_resume_device) | |
661 | goto Check_image; | |
662 | ||
663 | if (!strlen(resume_file)) { | |
664 | error = -ENOENT; | |
665 | goto Unlock; | |
666 | } | |
667 | ||
668 | pr_debug("PM: Checking image partition %s\n", resume_file); | |
669 | ||
670 | /* Check if the device is there */ | |
671 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 672 | if (!swsusp_resume_device) { |
eed3ee08 AV |
673 | /* |
674 | * Some device discovery might still be in progress; we need | |
675 | * to wait for this to finish. | |
676 | */ | |
677 | wait_for_device_probe(); | |
0c8454f5 RW |
678 | /* |
679 | * We can't depend on SCSI devices being available after loading | |
680 | * one of their modules until scsi_complete_async_scans() is | |
681 | * called and the resume device usually is a SCSI one. | |
682 | */ | |
683 | scsi_complete_async_scans(); | |
684 | ||
3efa147a | 685 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
686 | if (!swsusp_resume_device) { |
687 | error = -ENODEV; | |
688 | goto Unlock; | |
689 | } | |
3efa147a PM |
690 | } |
691 | ||
0c8454f5 RW |
692 | Check_image: |
693 | pr_debug("PM: Resume from partition %d:%d\n", | |
694 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
1da177e4 | 695 | |
23976728 | 696 | pr_debug("PM: Checking hibernation image.\n"); |
ed746e3b RW |
697 | error = swsusp_check(); |
698 | if (error) | |
74dfd666 | 699 | goto Unlock; |
1da177e4 | 700 | |
0709db60 RW |
701 | /* The snapshot device should not be opened while we're running */ |
702 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
703 | error = -EBUSY; | |
704 | goto Unlock; | |
705 | } | |
706 | ||
5a0a2f30 | 707 | pm_prepare_console(); |
c3e94d89 AS |
708 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
709 | if (error) | |
710 | goto Finish; | |
711 | ||
1bfcf130 RW |
712 | error = usermodehelper_disable(); |
713 | if (error) | |
714 | goto Finish; | |
715 | ||
74dfd666 RW |
716 | error = create_basic_memory_bitmaps(); |
717 | if (error) | |
0709db60 | 718 | goto Finish; |
1da177e4 | 719 | |
74dfd666 | 720 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
721 | error = prepare_processes(); |
722 | if (error) { | |
c2dd0dae | 723 | swsusp_close(FMODE_READ); |
5a72e04d | 724 | goto Done; |
1da177e4 LT |
725 | } |
726 | ||
23976728 | 727 | pr_debug("PM: Reading hibernation image.\n"); |
1da177e4 | 728 | |
a634cc10 | 729 | error = swsusp_read(&flags); |
ed746e3b | 730 | if (!error) |
a634cc10 | 731 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 732 | |
ed746e3b | 733 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 734 | swsusp_free(); |
5a0a2f30 | 735 | thaw_processes(); |
1da177e4 | 736 | Done: |
74dfd666 | 737 | free_basic_memory_bitmaps(); |
1bfcf130 | 738 | usermodehelper_enable(); |
0709db60 | 739 | Finish: |
c3e94d89 | 740 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 741 | pm_restore_console(); |
0709db60 | 742 | atomic_inc(&snapshot_device_available); |
dd5d666b | 743 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 744 | Unlock: |
a6d70980 | 745 | mutex_unlock(&pm_mutex); |
1da177e4 | 746 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 747 | return error; |
1da177e4 LT |
748 | } |
749 | ||
750 | late_initcall(software_resume); | |
751 | ||
752 | ||
a3d25c27 RW |
753 | static const char * const hibernation_modes[] = { |
754 | [HIBERNATION_PLATFORM] = "platform", | |
755 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
756 | [HIBERNATION_REBOOT] = "reboot", | |
757 | [HIBERNATION_TEST] = "test", | |
758 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
759 | }; |
760 | ||
761 | /** | |
a3d25c27 | 762 | * disk - Control hibernation mode |
1da177e4 | 763 | * |
11d77d0c JB |
764 | * Suspend-to-disk can be handled in several ways. We have a few options |
765 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
766 | * or other hibernation_ops), powering off the system or rebooting the |
767 | * system (for testing) as well as the two test modes. | |
1da177e4 | 768 | * |
11d77d0c | 769 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
770 | * encoded by the presence of hibernation_ops). However, the user may |
771 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
772 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
773 | * |
774 | * show() will display what the mode is currently set to. | |
775 | * store() will accept one of | |
776 | * | |
1da177e4 LT |
777 | * 'platform' |
778 | * 'shutdown' | |
779 | * 'reboot' | |
11d77d0c JB |
780 | * 'test' |
781 | * 'testproc' | |
1da177e4 | 782 | * |
11d77d0c | 783 | * It will only change to 'platform' if the system |
a3d25c27 | 784 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
785 | */ |
786 | ||
386f275f KS |
787 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
788 | char *buf) | |
1da177e4 | 789 | { |
f0ced9b2 JB |
790 | int i; |
791 | char *start = buf; | |
792 | ||
a3d25c27 RW |
793 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
794 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
795 | continue; |
796 | switch (i) { | |
a3d25c27 RW |
797 | case HIBERNATION_SHUTDOWN: |
798 | case HIBERNATION_REBOOT: | |
799 | case HIBERNATION_TEST: | |
800 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 801 | break; |
a3d25c27 RW |
802 | case HIBERNATION_PLATFORM: |
803 | if (hibernation_ops) | |
f0ced9b2 JB |
804 | break; |
805 | /* not a valid mode, continue with loop */ | |
806 | continue; | |
807 | } | |
a3d25c27 RW |
808 | if (i == hibernation_mode) |
809 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 810 | else |
a3d25c27 | 811 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
812 | } |
813 | buf += sprintf(buf, "\n"); | |
814 | return buf-start; | |
1da177e4 LT |
815 | } |
816 | ||
817 | ||
386f275f KS |
818 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
819 | const char *buf, size_t n) | |
1da177e4 LT |
820 | { |
821 | int error = 0; | |
822 | int i; | |
823 | int len; | |
824 | char *p; | |
a3d25c27 | 825 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
826 | |
827 | p = memchr(buf, '\n', n); | |
828 | len = p ? p - buf : n; | |
829 | ||
a6d70980 | 830 | mutex_lock(&pm_mutex); |
a3d25c27 | 831 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
832 | if (len == strlen(hibernation_modes[i]) |
833 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
834 | mode = i; |
835 | break; | |
836 | } | |
837 | } | |
a3d25c27 | 838 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 839 | switch (mode) { |
a3d25c27 RW |
840 | case HIBERNATION_SHUTDOWN: |
841 | case HIBERNATION_REBOOT: | |
842 | case HIBERNATION_TEST: | |
843 | case HIBERNATION_TESTPROC: | |
844 | hibernation_mode = mode; | |
fe0c935a | 845 | break; |
a3d25c27 RW |
846 | case HIBERNATION_PLATFORM: |
847 | if (hibernation_ops) | |
848 | hibernation_mode = mode; | |
1da177e4 LT |
849 | else |
850 | error = -EINVAL; | |
851 | } | |
a3d25c27 | 852 | } else |
1da177e4 LT |
853 | error = -EINVAL; |
854 | ||
a3d25c27 | 855 | if (!error) |
23976728 | 856 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 857 | hibernation_modes[mode]); |
a6d70980 | 858 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
859 | return error ? error : n; |
860 | } | |
861 | ||
862 | power_attr(disk); | |
863 | ||
386f275f KS |
864 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
865 | char *buf) | |
1da177e4 LT |
866 | { |
867 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
868 | MINOR(swsusp_resume_device)); | |
869 | } | |
870 | ||
386f275f KS |
871 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
872 | const char *buf, size_t n) | |
1da177e4 | 873 | { |
1da177e4 | 874 | unsigned int maj, min; |
1da177e4 | 875 | dev_t res; |
a576219a | 876 | int ret = -EINVAL; |
1da177e4 | 877 | |
a576219a AM |
878 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
879 | goto out; | |
1da177e4 | 880 | |
a576219a AM |
881 | res = MKDEV(maj,min); |
882 | if (maj != MAJOR(res) || min != MINOR(res)) | |
883 | goto out; | |
1da177e4 | 884 | |
a6d70980 | 885 | mutex_lock(&pm_mutex); |
a576219a | 886 | swsusp_resume_device = res; |
a6d70980 | 887 | mutex_unlock(&pm_mutex); |
23976728 | 888 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
889 | noresume = 0; |
890 | software_resume(); | |
891 | ret = n; | |
59a49335 | 892 | out: |
a576219a | 893 | return ret; |
1da177e4 LT |
894 | } |
895 | ||
896 | power_attr(resume); | |
897 | ||
386f275f KS |
898 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
899 | char *buf) | |
ca0aec0f | 900 | { |
853609b6 | 901 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
902 | } |
903 | ||
386f275f KS |
904 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
905 | const char *buf, size_t n) | |
ca0aec0f | 906 | { |
853609b6 | 907 | unsigned long size; |
ca0aec0f | 908 | |
853609b6 | 909 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
910 | image_size = size; |
911 | return n; | |
912 | } | |
913 | ||
914 | return -EINVAL; | |
915 | } | |
916 | ||
917 | power_attr(image_size); | |
918 | ||
1da177e4 LT |
919 | static struct attribute * g[] = { |
920 | &disk_attr.attr, | |
921 | &resume_attr.attr, | |
ca0aec0f | 922 | &image_size_attr.attr, |
1da177e4 LT |
923 | NULL, |
924 | }; | |
925 | ||
926 | ||
927 | static struct attribute_group attr_group = { | |
928 | .attrs = g, | |
929 | }; | |
930 | ||
931 | ||
932 | static int __init pm_disk_init(void) | |
933 | { | |
d76e15fb | 934 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
935 | } |
936 | ||
937 | core_initcall(pm_disk_init); | |
938 | ||
939 | ||
940 | static int __init resume_setup(char *str) | |
941 | { | |
942 | if (noresume) | |
943 | return 1; | |
944 | ||
945 | strncpy( resume_file, str, 255 ); | |
946 | return 1; | |
947 | } | |
948 | ||
9a154d9d RW |
949 | static int __init resume_offset_setup(char *str) |
950 | { | |
951 | unsigned long long offset; | |
952 | ||
953 | if (noresume) | |
954 | return 1; | |
955 | ||
956 | if (sscanf(str, "%llu", &offset) == 1) | |
957 | swsusp_resume_block = offset; | |
958 | ||
959 | return 1; | |
960 | } | |
961 | ||
1da177e4 LT |
962 | static int __init noresume_setup(char *str) |
963 | { | |
964 | noresume = 1; | |
965 | return 1; | |
966 | } | |
967 | ||
968 | __setup("noresume", noresume_setup); | |
9a154d9d | 969 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 970 | __setup("resume=", resume_setup); |