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Commit | Line | Data |
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1da177e4 | 1 | /* |
8b759b84 | 2 | * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support. |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2004 Pavel Machek <pavel@suse.cz> | |
8b759b84 | 7 | * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc. |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2. | |
1da177e4 LT |
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 | ||
d1616302 AS |
218 | /* At this point, dpm_suspend_start() has been called, but *not* |
219 | * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now. | |
c7e0831d RW |
220 | * Otherwise, drivers for some devices (e.g. interrupt controllers) |
221 | * become desynchronized with the actual state of the hardware | |
222 | * at resume time, and evil weirdness ensues. | |
223 | */ | |
d1616302 | 224 | error = dpm_suspend_noirq(PMSG_FREEZE); |
c7e0831d | 225 | if (error) { |
23976728 RW |
226 | printk(KERN_ERR "PM: Some devices failed to power down, " |
227 | "aborting hibernation\n"); | |
32bdfac5 | 228 | return error; |
c7e0831d | 229 | } |
2ed8d2b3 | 230 | |
4aecd671 RW |
231 | error = platform_pre_snapshot(platform_mode); |
232 | if (error || hibernation_test(TEST_PLATFORM)) | |
233 | goto Platform_finish; | |
234 | ||
235 | error = disable_nonboot_cpus(); | |
236 | if (error || hibernation_test(TEST_CPUS) | |
237 | || hibernation_testmode(HIBERNATION_TEST)) | |
238 | goto Enable_cpus; | |
239 | ||
2ed8d2b3 RW |
240 | local_irq_disable(); |
241 | ||
4484079d | 242 | error = sysdev_suspend(PMSG_FREEZE); |
770824bd | 243 | if (error) { |
4484079d | 244 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
770824bd | 245 | "aborting hibernation\n"); |
4aecd671 | 246 | goto Enable_irqs; |
770824bd | 247 | } |
c7e0831d | 248 | |
4cc79776 RW |
249 | if (hibernation_test(TEST_CORE)) |
250 | goto Power_up; | |
251 | ||
252 | in_suspend = 1; | |
c7e0831d RW |
253 | save_processor_state(); |
254 | error = swsusp_arch_suspend(); | |
255 | if (error) | |
23976728 RW |
256 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
257 | error); | |
c7e0831d RW |
258 | /* Restore control flow magically appears here */ |
259 | restore_processor_state(); | |
260 | if (!in_suspend) | |
261 | platform_leave(platform_mode); | |
4aecd671 | 262 | |
4cc79776 | 263 | Power_up: |
770824bd | 264 | sysdev_resume(); |
d1616302 | 265 | /* NOTE: dpm_resume_noirq() is just a resume() for devices |
c7e0831d RW |
266 | * that suspended with irqs off ... no overall powerup. |
267 | */ | |
2ed8d2b3 | 268 | |
4aecd671 | 269 | Enable_irqs: |
2ed8d2b3 RW |
270 | local_irq_enable(); |
271 | ||
4aecd671 RW |
272 | Enable_cpus: |
273 | enable_nonboot_cpus(); | |
274 | ||
275 | Platform_finish: | |
276 | platform_finish(platform_mode); | |
277 | ||
d1616302 | 278 | dpm_resume_noirq(in_suspend ? |
1eede070 | 279 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
2ed8d2b3 | 280 | |
c7e0831d RW |
281 | return error; |
282 | } | |
283 | ||
7777fab9 RW |
284 | /** |
285 | * hibernation_snapshot - quiesce devices and create the hibernation | |
286 | * snapshot image. | |
287 | * @platform_mode - if set, use the platform driver, if available, to | |
877d0310 | 288 | * prepare the platform firmware for the power transition. |
7777fab9 RW |
289 | * |
290 | * Must be called with pm_mutex held | |
291 | */ | |
292 | ||
293 | int hibernation_snapshot(int platform_mode) | |
294 | { | |
cbe2f5a6 | 295 | int error; |
7777fab9 | 296 | |
3fe0313e | 297 | error = platform_begin(platform_mode); |
7777fab9 | 298 | if (error) |
10a1803d | 299 | return error; |
7777fab9 | 300 | |
3fe0313e ZR |
301 | /* Free memory before shutting down devices. */ |
302 | error = swsusp_shrink_memory(); | |
74f270af | 303 | if (error) |
caea99ef | 304 | goto Close; |
74f270af | 305 | |
7777fab9 | 306 | suspend_console(); |
d1616302 | 307 | error = dpm_suspend_start(PMSG_FREEZE); |
10a1803d | 308 | if (error) |
d8f3de0d | 309 | goto Recover_platform; |
10a1803d | 310 | |
4cc79776 | 311 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 312 | goto Recover_platform; |
7777fab9 | 313 | |
4aecd671 RW |
314 | error = create_image(platform_mode); |
315 | /* Control returns here after successful restore */ | |
4cc79776 | 316 | |
4cc79776 | 317 | Resume_devices: |
d1616302 | 318 | dpm_resume_end(in_suspend ? |
1eede070 | 319 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
7777fab9 | 320 | resume_console(); |
caea99ef RW |
321 | Close: |
322 | platform_end(platform_mode); | |
7777fab9 | 323 | return error; |
d8f3de0d RW |
324 | |
325 | Recover_platform: | |
326 | platform_recover(platform_mode); | |
327 | goto Resume_devices; | |
7777fab9 RW |
328 | } |
329 | ||
72df68ca RW |
330 | /** |
331 | * resume_target_kernel - prepare devices that need to be suspended with | |
332 | * interrupts off, restore the contents of highmem that have not been | |
333 | * restored yet from the image and run the low level code that will restore | |
334 | * the remaining contents of memory and switch to the just restored target | |
335 | * kernel. | |
336 | */ | |
337 | ||
4aecd671 | 338 | static int resume_target_kernel(bool platform_mode) |
72df68ca RW |
339 | { |
340 | int error; | |
341 | ||
d1616302 | 342 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
72df68ca | 343 | if (error) { |
23976728 | 344 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca | 345 | "aborting resume\n"); |
32bdfac5 | 346 | return error; |
72df68ca | 347 | } |
2ed8d2b3 | 348 | |
4aecd671 RW |
349 | error = platform_pre_restore(platform_mode); |
350 | if (error) | |
351 | goto Cleanup; | |
352 | ||
353 | error = disable_nonboot_cpus(); | |
354 | if (error) | |
355 | goto Enable_cpus; | |
356 | ||
2ed8d2b3 RW |
357 | local_irq_disable(); |
358 | ||
4aecd671 RW |
359 | error = sysdev_suspend(PMSG_QUIESCE); |
360 | if (error) | |
361 | goto Enable_irqs; | |
362 | ||
72df68ca RW |
363 | /* We'll ignore saved state, but this gets preempt count (etc) right */ |
364 | save_processor_state(); | |
365 | error = restore_highmem(); | |
366 | if (!error) { | |
367 | error = swsusp_arch_resume(); | |
368 | /* | |
369 | * The code below is only ever reached in case of a failure. | |
370 | * Otherwise execution continues at place where | |
371 | * swsusp_arch_suspend() was called | |
372 | */ | |
373 | BUG_ON(!error); | |
374 | /* This call to restore_highmem() undos the previous one */ | |
375 | restore_highmem(); | |
376 | } | |
377 | /* | |
378 | * The only reason why swsusp_arch_resume() can fail is memory being | |
379 | * very tight, so we have to free it as soon as we can to avoid | |
380 | * subsequent failures | |
381 | */ | |
382 | swsusp_free(); | |
383 | restore_processor_state(); | |
384 | touch_softlockup_watchdog(); | |
2ed8d2b3 | 385 | |
770824bd | 386 | sysdev_resume(); |
2ed8d2b3 | 387 | |
4aecd671 | 388 | Enable_irqs: |
72df68ca | 389 | local_irq_enable(); |
2ed8d2b3 | 390 | |
4aecd671 RW |
391 | Enable_cpus: |
392 | enable_nonboot_cpus(); | |
393 | ||
394 | Cleanup: | |
395 | platform_restore_cleanup(platform_mode); | |
396 | ||
d1616302 | 397 | dpm_resume_noirq(PMSG_RECOVER); |
2ed8d2b3 | 398 | |
72df68ca RW |
399 | return error; |
400 | } | |
401 | ||
7777fab9 RW |
402 | /** |
403 | * hibernation_restore - quiesce devices and restore the hibernation | |
404 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 | 405 | * @platform_mode - if set, use the platform driver, if available, to |
877d0310 | 406 | * prepare the platform firmware for the transition. |
7777fab9 RW |
407 | * |
408 | * Must be called with pm_mutex held | |
409 | */ | |
410 | ||
a634cc10 | 411 | int hibernation_restore(int platform_mode) |
7777fab9 | 412 | { |
cbe2f5a6 | 413 | int error; |
7777fab9 RW |
414 | |
415 | pm_prepare_console(); | |
416 | suspend_console(); | |
d1616302 | 417 | error = dpm_suspend_start(PMSG_QUIESCE); |
a634cc10 | 418 | if (!error) { |
4aecd671 | 419 | error = resume_target_kernel(platform_mode); |
d1616302 | 420 | dpm_resume_end(PMSG_RECOVER); |
a634cc10 | 421 | } |
7777fab9 RW |
422 | resume_console(); |
423 | pm_restore_console(); | |
424 | return error; | |
425 | } | |
426 | ||
427 | /** | |
428 | * hibernation_platform_enter - enter the hibernation state using the | |
429 | * platform driver (if available) | |
430 | */ | |
431 | ||
432 | int hibernation_platform_enter(void) | |
433 | { | |
cbe2f5a6 | 434 | int error; |
b1457bcc | 435 | |
9cd9a005 RW |
436 | if (!hibernation_ops) |
437 | return -ENOSYS; | |
438 | ||
439 | /* | |
440 | * We have cancelled the power transition by running | |
441 | * hibernation_ops->finish() before saving the image, so we should let | |
442 | * the firmware know that we're going to enter the sleep state after all | |
443 | */ | |
caea99ef | 444 | error = hibernation_ops->begin(); |
9cd9a005 | 445 | if (error) |
caea99ef | 446 | goto Close; |
9cd9a005 | 447 | |
abfe2d7b | 448 | entering_platform_hibernation = true; |
9cd9a005 | 449 | suspend_console(); |
d1616302 | 450 | error = dpm_suspend_start(PMSG_HIBERNATE); |
d8f3de0d RW |
451 | if (error) { |
452 | if (hibernation_ops->recover) | |
453 | hibernation_ops->recover(); | |
454 | goto Resume_devices; | |
455 | } | |
9cd9a005 | 456 | |
d1616302 | 457 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
4aecd671 | 458 | if (error) |
32bdfac5 | 459 | goto Resume_devices; |
4aecd671 | 460 | |
9cd9a005 RW |
461 | error = hibernation_ops->prepare(); |
462 | if (error) | |
4aecd671 | 463 | goto Platofrm_finish; |
9cd9a005 RW |
464 | |
465 | error = disable_nonboot_cpus(); | |
466 | if (error) | |
4aecd671 | 467 | goto Platofrm_finish; |
2ed8d2b3 | 468 | |
4aecd671 RW |
469 | local_irq_disable(); |
470 | sysdev_suspend(PMSG_HIBERNATE); | |
471 | hibernation_ops->enter(); | |
472 | /* We should never get here */ | |
473 | while (1); | |
9cd9a005 RW |
474 | |
475 | /* | |
476 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
477 | * the system is going to be halted anyway. | |
478 | */ | |
4aecd671 | 479 | Platofrm_finish: |
9cd9a005 | 480 | hibernation_ops->finish(); |
2ed8d2b3 | 481 | |
d1616302 | 482 | dpm_suspend_noirq(PMSG_RESTORE); |
4aecd671 | 483 | |
9cd9a005 | 484 | Resume_devices: |
abfe2d7b | 485 | entering_platform_hibernation = false; |
d1616302 | 486 | dpm_resume_end(PMSG_RESTORE); |
9cd9a005 | 487 | resume_console(); |
2ed8d2b3 | 488 | |
caea99ef RW |
489 | Close: |
490 | hibernation_ops->end(); | |
2ed8d2b3 | 491 | |
b1457bcc | 492 | return error; |
7777fab9 RW |
493 | } |
494 | ||
1da177e4 | 495 | /** |
a3d25c27 | 496 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 497 | * |
fe0c935a JB |
498 | * Use the platform driver, if configured so; otherwise try |
499 | * to power off or reboot. | |
1da177e4 LT |
500 | */ |
501 | ||
fe0c935a | 502 | static void power_down(void) |
1da177e4 | 503 | { |
a3d25c27 RW |
504 | switch (hibernation_mode) { |
505 | case HIBERNATION_TEST: | |
506 | case HIBERNATION_TESTPROC: | |
fe0c935a | 507 | break; |
a3d25c27 | 508 | case HIBERNATION_REBOOT: |
fdde86ac | 509 | kernel_restart(NULL); |
1da177e4 | 510 | break; |
a3d25c27 | 511 | case HIBERNATION_PLATFORM: |
7777fab9 | 512 | hibernation_platform_enter(); |
9cd9a005 RW |
513 | case HIBERNATION_SHUTDOWN: |
514 | kernel_power_off(); | |
515 | break; | |
1da177e4 | 516 | } |
fdde86ac | 517 | kernel_halt(); |
fe0c935a JB |
518 | /* |
519 | * Valid image is on the disk, if we continue we risk serious data | |
520 | * corruption after resume. | |
521 | */ | |
23976728 | 522 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
523 | while(1); |
524 | } | |
525 | ||
1da177e4 LT |
526 | static int prepare_processes(void) |
527 | { | |
b918f6e6 | 528 | int error = 0; |
1da177e4 | 529 | |
1da177e4 LT |
530 | if (freeze_processes()) { |
531 | error = -EBUSY; | |
5a0a2f30 | 532 | thaw_processes(); |
1da177e4 | 533 | } |
5a72e04d | 534 | return error; |
1da177e4 LT |
535 | } |
536 | ||
1da177e4 | 537 | /** |
a3d25c27 | 538 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
539 | */ |
540 | ||
a3d25c27 | 541 | int hibernate(void) |
1da177e4 LT |
542 | { |
543 | int error; | |
544 | ||
b10d9117 | 545 | mutex_lock(&pm_mutex); |
0709db60 | 546 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
547 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
548 | error = -EBUSY; | |
549 | goto Unlock; | |
550 | } | |
551 | ||
5a0a2f30 | 552 | pm_prepare_console(); |
b10d9117 RW |
553 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
554 | if (error) | |
555 | goto Exit; | |
0709db60 | 556 | |
1bfcf130 RW |
557 | error = usermodehelper_disable(); |
558 | if (error) | |
559 | goto Exit; | |
560 | ||
0709db60 RW |
561 | /* Allocate memory management structures */ |
562 | error = create_basic_memory_bitmaps(); | |
563 | if (error) | |
564 | goto Exit; | |
565 | ||
23976728 | 566 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
567 | sys_sync(); |
568 | printk("done.\n"); | |
569 | ||
1da177e4 | 570 | error = prepare_processes(); |
5a72e04d | 571 | if (error) |
0709db60 | 572 | goto Finish; |
1da177e4 | 573 | |
4cc79776 | 574 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 575 | goto Thaw; |
4cc79776 RW |
576 | |
577 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
578 | goto Thaw; | |
579 | ||
7777fab9 RW |
580 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
581 | if (in_suspend && !error) { | |
a634cc10 RW |
582 | unsigned int flags = 0; |
583 | ||
584 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
585 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 586 | pr_debug("PM: writing image.\n"); |
a634cc10 | 587 | error = swsusp_write(flags); |
7777fab9 | 588 | swsusp_free(); |
1da177e4 | 589 | if (!error) |
fe0c935a | 590 | power_down(); |
b918f6e6 | 591 | } else { |
1da177e4 | 592 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 593 | swsusp_free(); |
b918f6e6 | 594 | } |
b918f6e6 | 595 | Thaw: |
5a0a2f30 | 596 | thaw_processes(); |
0709db60 RW |
597 | Finish: |
598 | free_basic_memory_bitmaps(); | |
1bfcf130 | 599 | usermodehelper_enable(); |
0709db60 | 600 | Exit: |
b10d9117 | 601 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 602 | pm_restore_console(); |
0709db60 | 603 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
604 | Unlock: |
605 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
606 | return error; |
607 | } | |
608 | ||
609 | ||
610 | /** | |
611 | * software_resume - Resume from a saved image. | |
612 | * | |
613 | * Called as a late_initcall (so all devices are discovered and | |
614 | * initialized), we call swsusp to see if we have a saved image or not. | |
615 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 616 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
617 | * Otherwise, we fail gracefully and return to the normally |
618 | * scheduled program. | |
619 | * | |
620 | */ | |
621 | ||
622 | static int software_resume(void) | |
623 | { | |
624 | int error; | |
a634cc10 | 625 | unsigned int flags; |
1da177e4 | 626 | |
eed3ee08 AV |
627 | /* |
628 | * If the user said "noresume".. bail out early. | |
629 | */ | |
630 | if (noresume) | |
631 | return 0; | |
632 | ||
60a0d233 JB |
633 | /* |
634 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
635 | * is configured into the kernel. Since the regular hibernate | |
636 | * trigger path is via sysfs which takes a buffer mutex before | |
637 | * calling hibernate functions (which take pm_mutex) this can | |
638 | * cause lockdep to complain about a possible ABBA deadlock | |
639 | * which cannot happen since we're in the boot code here and | |
640 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
641 | * here to avoid lockdep complaining. | |
642 | */ | |
643 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
0c8454f5 RW |
644 | |
645 | if (swsusp_resume_device) | |
646 | goto Check_image; | |
647 | ||
648 | if (!strlen(resume_file)) { | |
649 | error = -ENOENT; | |
650 | goto Unlock; | |
651 | } | |
652 | ||
653 | pr_debug("PM: Checking image partition %s\n", resume_file); | |
654 | ||
655 | /* Check if the device is there */ | |
656 | swsusp_resume_device = name_to_dev_t(resume_file); | |
3efa147a | 657 | if (!swsusp_resume_device) { |
eed3ee08 AV |
658 | /* |
659 | * Some device discovery might still be in progress; we need | |
660 | * to wait for this to finish. | |
661 | */ | |
662 | wait_for_device_probe(); | |
0c8454f5 RW |
663 | /* |
664 | * We can't depend on SCSI devices being available after loading | |
665 | * one of their modules until scsi_complete_async_scans() is | |
666 | * called and the resume device usually is a SCSI one. | |
667 | */ | |
668 | scsi_complete_async_scans(); | |
669 | ||
3efa147a | 670 | swsusp_resume_device = name_to_dev_t(resume_file); |
0c8454f5 RW |
671 | if (!swsusp_resume_device) { |
672 | error = -ENODEV; | |
673 | goto Unlock; | |
674 | } | |
3efa147a PM |
675 | } |
676 | ||
0c8454f5 RW |
677 | Check_image: |
678 | pr_debug("PM: Resume from partition %d:%d\n", | |
679 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
1da177e4 | 680 | |
23976728 | 681 | pr_debug("PM: Checking hibernation image.\n"); |
ed746e3b RW |
682 | error = swsusp_check(); |
683 | if (error) | |
74dfd666 | 684 | goto Unlock; |
1da177e4 | 685 | |
0709db60 RW |
686 | /* The snapshot device should not be opened while we're running */ |
687 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
688 | error = -EBUSY; | |
689 | goto Unlock; | |
690 | } | |
691 | ||
5a0a2f30 | 692 | pm_prepare_console(); |
c3e94d89 AS |
693 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
694 | if (error) | |
695 | goto Finish; | |
696 | ||
1bfcf130 RW |
697 | error = usermodehelper_disable(); |
698 | if (error) | |
699 | goto Finish; | |
700 | ||
74dfd666 RW |
701 | error = create_basic_memory_bitmaps(); |
702 | if (error) | |
0709db60 | 703 | goto Finish; |
1da177e4 | 704 | |
74dfd666 | 705 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
706 | error = prepare_processes(); |
707 | if (error) { | |
c2dd0dae | 708 | swsusp_close(FMODE_READ); |
5a72e04d | 709 | goto Done; |
1da177e4 LT |
710 | } |
711 | ||
23976728 | 712 | pr_debug("PM: Reading hibernation image.\n"); |
1da177e4 | 713 | |
a634cc10 | 714 | error = swsusp_read(&flags); |
ed746e3b | 715 | if (!error) |
a634cc10 | 716 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 717 | |
ed746e3b | 718 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 719 | swsusp_free(); |
5a0a2f30 | 720 | thaw_processes(); |
1da177e4 | 721 | Done: |
74dfd666 | 722 | free_basic_memory_bitmaps(); |
1bfcf130 | 723 | usermodehelper_enable(); |
0709db60 | 724 | Finish: |
c3e94d89 | 725 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 726 | pm_restore_console(); |
0709db60 | 727 | atomic_inc(&snapshot_device_available); |
dd5d666b | 728 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 729 | Unlock: |
a6d70980 | 730 | mutex_unlock(&pm_mutex); |
1da177e4 | 731 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 732 | return error; |
1da177e4 LT |
733 | } |
734 | ||
735 | late_initcall(software_resume); | |
736 | ||
737 | ||
a3d25c27 RW |
738 | static const char * const hibernation_modes[] = { |
739 | [HIBERNATION_PLATFORM] = "platform", | |
740 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
741 | [HIBERNATION_REBOOT] = "reboot", | |
742 | [HIBERNATION_TEST] = "test", | |
743 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
744 | }; |
745 | ||
746 | /** | |
a3d25c27 | 747 | * disk - Control hibernation mode |
1da177e4 | 748 | * |
11d77d0c JB |
749 | * Suspend-to-disk can be handled in several ways. We have a few options |
750 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
751 | * or other hibernation_ops), powering off the system or rebooting the |
752 | * system (for testing) as well as the two test modes. | |
1da177e4 | 753 | * |
11d77d0c | 754 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
755 | * encoded by the presence of hibernation_ops). However, the user may |
756 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
757 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
758 | * |
759 | * show() will display what the mode is currently set to. | |
760 | * store() will accept one of | |
761 | * | |
1da177e4 LT |
762 | * 'platform' |
763 | * 'shutdown' | |
764 | * 'reboot' | |
11d77d0c JB |
765 | * 'test' |
766 | * 'testproc' | |
1da177e4 | 767 | * |
11d77d0c | 768 | * It will only change to 'platform' if the system |
a3d25c27 | 769 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
770 | */ |
771 | ||
386f275f KS |
772 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
773 | char *buf) | |
1da177e4 | 774 | { |
f0ced9b2 JB |
775 | int i; |
776 | char *start = buf; | |
777 | ||
a3d25c27 RW |
778 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
779 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
780 | continue; |
781 | switch (i) { | |
a3d25c27 RW |
782 | case HIBERNATION_SHUTDOWN: |
783 | case HIBERNATION_REBOOT: | |
784 | case HIBERNATION_TEST: | |
785 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 786 | break; |
a3d25c27 RW |
787 | case HIBERNATION_PLATFORM: |
788 | if (hibernation_ops) | |
f0ced9b2 JB |
789 | break; |
790 | /* not a valid mode, continue with loop */ | |
791 | continue; | |
792 | } | |
a3d25c27 RW |
793 | if (i == hibernation_mode) |
794 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 795 | else |
a3d25c27 | 796 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
797 | } |
798 | buf += sprintf(buf, "\n"); | |
799 | return buf-start; | |
1da177e4 LT |
800 | } |
801 | ||
802 | ||
386f275f KS |
803 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
804 | const char *buf, size_t n) | |
1da177e4 LT |
805 | { |
806 | int error = 0; | |
807 | int i; | |
808 | int len; | |
809 | char *p; | |
a3d25c27 | 810 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
811 | |
812 | p = memchr(buf, '\n', n); | |
813 | len = p ? p - buf : n; | |
814 | ||
a6d70980 | 815 | mutex_lock(&pm_mutex); |
a3d25c27 | 816 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
817 | if (len == strlen(hibernation_modes[i]) |
818 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
819 | mode = i; |
820 | break; | |
821 | } | |
822 | } | |
a3d25c27 | 823 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 824 | switch (mode) { |
a3d25c27 RW |
825 | case HIBERNATION_SHUTDOWN: |
826 | case HIBERNATION_REBOOT: | |
827 | case HIBERNATION_TEST: | |
828 | case HIBERNATION_TESTPROC: | |
829 | hibernation_mode = mode; | |
fe0c935a | 830 | break; |
a3d25c27 RW |
831 | case HIBERNATION_PLATFORM: |
832 | if (hibernation_ops) | |
833 | hibernation_mode = mode; | |
1da177e4 LT |
834 | else |
835 | error = -EINVAL; | |
836 | } | |
a3d25c27 | 837 | } else |
1da177e4 LT |
838 | error = -EINVAL; |
839 | ||
a3d25c27 | 840 | if (!error) |
23976728 | 841 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 842 | hibernation_modes[mode]); |
a6d70980 | 843 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
844 | return error ? error : n; |
845 | } | |
846 | ||
847 | power_attr(disk); | |
848 | ||
386f275f KS |
849 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
850 | char *buf) | |
1da177e4 LT |
851 | { |
852 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
853 | MINOR(swsusp_resume_device)); | |
854 | } | |
855 | ||
386f275f KS |
856 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
857 | const char *buf, size_t n) | |
1da177e4 | 858 | { |
1da177e4 | 859 | unsigned int maj, min; |
1da177e4 | 860 | dev_t res; |
a576219a | 861 | int ret = -EINVAL; |
1da177e4 | 862 | |
a576219a AM |
863 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
864 | goto out; | |
1da177e4 | 865 | |
a576219a AM |
866 | res = MKDEV(maj,min); |
867 | if (maj != MAJOR(res) || min != MINOR(res)) | |
868 | goto out; | |
1da177e4 | 869 | |
a6d70980 | 870 | mutex_lock(&pm_mutex); |
a576219a | 871 | swsusp_resume_device = res; |
a6d70980 | 872 | mutex_unlock(&pm_mutex); |
23976728 | 873 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
874 | noresume = 0; |
875 | software_resume(); | |
876 | ret = n; | |
59a49335 | 877 | out: |
a576219a | 878 | return ret; |
1da177e4 LT |
879 | } |
880 | ||
881 | power_attr(resume); | |
882 | ||
386f275f KS |
883 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
884 | char *buf) | |
ca0aec0f | 885 | { |
853609b6 | 886 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
887 | } |
888 | ||
386f275f KS |
889 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
890 | const char *buf, size_t n) | |
ca0aec0f | 891 | { |
853609b6 | 892 | unsigned long size; |
ca0aec0f | 893 | |
853609b6 | 894 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
895 | image_size = size; |
896 | return n; | |
897 | } | |
898 | ||
899 | return -EINVAL; | |
900 | } | |
901 | ||
902 | power_attr(image_size); | |
903 | ||
1da177e4 LT |
904 | static struct attribute * g[] = { |
905 | &disk_attr.attr, | |
906 | &resume_attr.attr, | |
ca0aec0f | 907 | &image_size_attr.attr, |
1da177e4 LT |
908 | NULL, |
909 | }; | |
910 | ||
911 | ||
912 | static struct attribute_group attr_group = { | |
913 | .attrs = g, | |
914 | }; | |
915 | ||
916 | ||
917 | static int __init pm_disk_init(void) | |
918 | { | |
d76e15fb | 919 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
920 | } |
921 | ||
922 | core_initcall(pm_disk_init); | |
923 | ||
924 | ||
925 | static int __init resume_setup(char *str) | |
926 | { | |
927 | if (noresume) | |
928 | return 1; | |
929 | ||
930 | strncpy( resume_file, str, 255 ); | |
931 | return 1; | |
932 | } | |
933 | ||
9a154d9d RW |
934 | static int __init resume_offset_setup(char *str) |
935 | { | |
936 | unsigned long long offset; | |
937 | ||
938 | if (noresume) | |
939 | return 1; | |
940 | ||
941 | if (sscanf(str, "%llu", &offset) == 1) | |
942 | swsusp_resume_block = offset; | |
943 | ||
944 | return 1; | |
945 | } | |
946 | ||
1da177e4 LT |
947 | static int __init noresume_setup(char *str) |
948 | { | |
949 | noresume = 1; | |
950 | return 1; | |
951 | } | |
952 | ||
953 | __setup("noresume", noresume_setup); | |
9a154d9d | 954 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 955 | __setup("resume=", resume_setup); |