]>
Commit | Line | Data |
---|---|---|
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> |
41108eb1 | 25 | #include <linux/ftrace.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 | ||
4cc79776 RW |
75 | #ifdef CONFIG_PM_DEBUG |
76 | static void hibernation_debug_sleep(void) | |
77 | { | |
78 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
79 | mdelay(5000); | |
80 | } | |
81 | ||
82 | static int hibernation_testmode(int mode) | |
83 | { | |
84 | if (hibernation_mode == mode) { | |
85 | hibernation_debug_sleep(); | |
86 | return 1; | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int hibernation_test(int level) | |
92 | { | |
93 | if (pm_test_level == level) { | |
94 | hibernation_debug_sleep(); | |
95 | return 1; | |
96 | } | |
97 | return 0; | |
98 | } | |
99 | #else /* !CONFIG_PM_DEBUG */ | |
100 | static int hibernation_testmode(int mode) { return 0; } | |
101 | static int hibernation_test(int level) { return 0; } | |
102 | #endif /* !CONFIG_PM_DEBUG */ | |
103 | ||
74f270af | 104 | /** |
caea99ef | 105 | * platform_begin - tell the platform driver that we're starting |
74f270af RW |
106 | * hibernation |
107 | */ | |
108 | ||
caea99ef | 109 | static int platform_begin(int platform_mode) |
74f270af RW |
110 | { |
111 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
112 | hibernation_ops->begin() : 0; |
113 | } | |
114 | ||
115 | /** | |
116 | * platform_end - tell the platform driver that we've entered the | |
117 | * working state | |
118 | */ | |
119 | ||
120 | static void platform_end(int platform_mode) | |
121 | { | |
122 | if (platform_mode && hibernation_ops) | |
123 | hibernation_ops->end(); | |
74f270af | 124 | } |
a3d25c27 | 125 | |
8a05aac2 | 126 | /** |
74f270af | 127 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
128 | * platform driver if so configured and return an error code if it fails |
129 | */ | |
130 | ||
74f270af | 131 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 132 | { |
7777fab9 | 133 | return (platform_mode && hibernation_ops) ? |
74f270af | 134 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 135 | } |
8a05aac2 | 136 | |
c7e0831d RW |
137 | /** |
138 | * platform_leave - prepare the machine for switching to the normal mode | |
139 | * of operation using the platform driver (called with interrupts disabled) | |
140 | */ | |
141 | ||
142 | static void platform_leave(int platform_mode) | |
143 | { | |
144 | if (platform_mode && hibernation_ops) | |
145 | hibernation_ops->leave(); | |
146 | } | |
147 | ||
a3d25c27 RW |
148 | /** |
149 | * platform_finish - switch the machine to the normal mode of operation | |
150 | * using the platform driver (must be called after platform_prepare()) | |
151 | */ | |
152 | ||
7777fab9 | 153 | static void platform_finish(int platform_mode) |
a3d25c27 | 154 | { |
7777fab9 | 155 | if (platform_mode && hibernation_ops) |
a3d25c27 | 156 | hibernation_ops->finish(); |
8a05aac2 SS |
157 | } |
158 | ||
a634cc10 RW |
159 | /** |
160 | * platform_pre_restore - prepare the platform for the restoration from a | |
161 | * hibernation image. If the restore fails after this function has been | |
162 | * called, platform_restore_cleanup() must be called. | |
163 | */ | |
164 | ||
165 | static int platform_pre_restore(int platform_mode) | |
166 | { | |
167 | return (platform_mode && hibernation_ops) ? | |
168 | hibernation_ops->pre_restore() : 0; | |
169 | } | |
170 | ||
171 | /** | |
172 | * platform_restore_cleanup - switch the platform to the normal mode of | |
173 | * operation after a failing restore. If platform_pre_restore() has been | |
174 | * called before the failing restore, this function must be called too, | |
175 | * regardless of the result of platform_pre_restore(). | |
176 | */ | |
177 | ||
178 | static void platform_restore_cleanup(int platform_mode) | |
179 | { | |
180 | if (platform_mode && hibernation_ops) | |
181 | hibernation_ops->restore_cleanup(); | |
182 | } | |
183 | ||
d8f3de0d RW |
184 | /** |
185 | * platform_recover - recover the platform from a failure to suspend | |
186 | * devices. | |
187 | */ | |
188 | ||
189 | static void platform_recover(int platform_mode) | |
190 | { | |
191 | if (platform_mode && hibernation_ops && hibernation_ops->recover) | |
192 | hibernation_ops->recover(); | |
193 | } | |
194 | ||
c7e0831d RW |
195 | /** |
196 | * create_image - freeze devices that need to be frozen with interrupts | |
197 | * off, create the hibernation image and thaw those devices. Control | |
198 | * reappears in this routine after a restore. | |
199 | */ | |
200 | ||
47a460d5 | 201 | static int create_image(int platform_mode) |
c7e0831d RW |
202 | { |
203 | int error; | |
204 | ||
205 | error = arch_prepare_suspend(); | |
206 | if (error) | |
207 | return error; | |
208 | ||
1eede070 | 209 | device_pm_lock(); |
c7e0831d RW |
210 | local_irq_disable(); |
211 | /* At this point, device_suspend() has been called, but *not* | |
212 | * device_power_down(). We *must* call device_power_down() now. | |
213 | * Otherwise, drivers for some devices (e.g. interrupt controllers) | |
214 | * become desynchronized with the actual state of the hardware | |
215 | * at resume time, and evil weirdness ensues. | |
216 | */ | |
217 | error = device_power_down(PMSG_FREEZE); | |
218 | if (error) { | |
23976728 RW |
219 | printk(KERN_ERR "PM: Some devices failed to power down, " |
220 | "aborting hibernation\n"); | |
c7e0831d RW |
221 | goto Enable_irqs; |
222 | } | |
223 | ||
4cc79776 RW |
224 | if (hibernation_test(TEST_CORE)) |
225 | goto Power_up; | |
226 | ||
227 | in_suspend = 1; | |
c7e0831d RW |
228 | save_processor_state(); |
229 | error = swsusp_arch_suspend(); | |
230 | if (error) | |
23976728 RW |
231 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
232 | error); | |
c7e0831d RW |
233 | /* Restore control flow magically appears here */ |
234 | restore_processor_state(); | |
235 | if (!in_suspend) | |
236 | platform_leave(platform_mode); | |
4cc79776 | 237 | Power_up: |
c7e0831d RW |
238 | /* NOTE: device_power_up() is just a resume() for devices |
239 | * that suspended with irqs off ... no overall powerup. | |
240 | */ | |
1eede070 RW |
241 | device_power_up(in_suspend ? |
242 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
c7e0831d RW |
243 | Enable_irqs: |
244 | local_irq_enable(); | |
1eede070 | 245 | device_pm_unlock(); |
c7e0831d RW |
246 | return error; |
247 | } | |
248 | ||
7777fab9 RW |
249 | /** |
250 | * hibernation_snapshot - quiesce devices and create the hibernation | |
251 | * snapshot image. | |
252 | * @platform_mode - if set, use the platform driver, if available, to | |
253 | * prepare the platform frimware for the power transition. | |
254 | * | |
255 | * Must be called with pm_mutex held | |
256 | */ | |
257 | ||
258 | int hibernation_snapshot(int platform_mode) | |
259 | { | |
41108eb1 | 260 | int error, ftrace_save; |
7777fab9 RW |
261 | |
262 | /* Free memory before shutting down devices. */ | |
263 | error = swsusp_shrink_memory(); | |
264 | if (error) | |
10a1803d | 265 | return error; |
7777fab9 | 266 | |
caea99ef | 267 | error = platform_begin(platform_mode); |
74f270af | 268 | if (error) |
caea99ef | 269 | goto Close; |
74f270af | 270 | |
7777fab9 | 271 | suspend_console(); |
41108eb1 | 272 | ftrace_save = __ftrace_enabled_save(); |
7777fab9 | 273 | error = device_suspend(PMSG_FREEZE); |
10a1803d | 274 | if (error) |
d8f3de0d | 275 | goto Recover_platform; |
10a1803d | 276 | |
4cc79776 | 277 | if (hibernation_test(TEST_DEVICES)) |
d8f3de0d | 278 | goto Recover_platform; |
7777fab9 | 279 | |
4cc79776 RW |
280 | error = platform_pre_snapshot(platform_mode); |
281 | if (error || hibernation_test(TEST_PLATFORM)) | |
282 | goto Finish; | |
283 | ||
7777fab9 RW |
284 | error = disable_nonboot_cpus(); |
285 | if (!error) { | |
4cc79776 RW |
286 | if (hibernation_test(TEST_CPUS)) |
287 | goto Enable_cpus; | |
288 | ||
289 | if (hibernation_testmode(HIBERNATION_TEST)) | |
290 | goto Enable_cpus; | |
291 | ||
292 | error = create_image(platform_mode); | |
293 | /* Control returns here after successful restore */ | |
7777fab9 | 294 | } |
4cc79776 | 295 | Enable_cpus: |
7777fab9 | 296 | enable_nonboot_cpus(); |
4cc79776 | 297 | Finish: |
7777fab9 | 298 | platform_finish(platform_mode); |
4cc79776 | 299 | Resume_devices: |
1eede070 RW |
300 | device_resume(in_suspend ? |
301 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
41108eb1 | 302 | __ftrace_enabled_restore(ftrace_save); |
7777fab9 | 303 | resume_console(); |
caea99ef RW |
304 | Close: |
305 | platform_end(platform_mode); | |
7777fab9 | 306 | return error; |
d8f3de0d RW |
307 | |
308 | Recover_platform: | |
309 | platform_recover(platform_mode); | |
310 | goto Resume_devices; | |
7777fab9 RW |
311 | } |
312 | ||
72df68ca RW |
313 | /** |
314 | * resume_target_kernel - prepare devices that need to be suspended with | |
315 | * interrupts off, restore the contents of highmem that have not been | |
316 | * restored yet from the image and run the low level code that will restore | |
317 | * the remaining contents of memory and switch to the just restored target | |
318 | * kernel. | |
319 | */ | |
320 | ||
321 | static int resume_target_kernel(void) | |
322 | { | |
323 | int error; | |
324 | ||
1eede070 | 325 | device_pm_lock(); |
72df68ca | 326 | local_irq_disable(); |
1eede070 | 327 | error = device_power_down(PMSG_QUIESCE); |
72df68ca | 328 | if (error) { |
23976728 | 329 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca RW |
330 | "aborting resume\n"); |
331 | goto Enable_irqs; | |
332 | } | |
333 | /* We'll ignore saved state, but this gets preempt count (etc) right */ | |
334 | save_processor_state(); | |
335 | error = restore_highmem(); | |
336 | if (!error) { | |
337 | error = swsusp_arch_resume(); | |
338 | /* | |
339 | * The code below is only ever reached in case of a failure. | |
340 | * Otherwise execution continues at place where | |
341 | * swsusp_arch_suspend() was called | |
342 | */ | |
343 | BUG_ON(!error); | |
344 | /* This call to restore_highmem() undos the previous one */ | |
345 | restore_highmem(); | |
346 | } | |
347 | /* | |
348 | * The only reason why swsusp_arch_resume() can fail is memory being | |
349 | * very tight, so we have to free it as soon as we can to avoid | |
350 | * subsequent failures | |
351 | */ | |
352 | swsusp_free(); | |
353 | restore_processor_state(); | |
354 | touch_softlockup_watchdog(); | |
1eede070 | 355 | device_power_up(PMSG_RECOVER); |
72df68ca RW |
356 | Enable_irqs: |
357 | local_irq_enable(); | |
1eede070 | 358 | device_pm_unlock(); |
72df68ca RW |
359 | return error; |
360 | } | |
361 | ||
7777fab9 RW |
362 | /** |
363 | * hibernation_restore - quiesce devices and restore the hibernation | |
364 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
365 | * @platform_mode - if set, use the platform driver, if available, to |
366 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
367 | * |
368 | * Must be called with pm_mutex held | |
369 | */ | |
370 | ||
a634cc10 | 371 | int hibernation_restore(int platform_mode) |
7777fab9 | 372 | { |
41108eb1 | 373 | int error, ftrace_save; |
7777fab9 RW |
374 | |
375 | pm_prepare_console(); | |
376 | suspend_console(); | |
41108eb1 | 377 | ftrace_save = __ftrace_enabled_save(); |
1eede070 | 378 | error = device_suspend(PMSG_QUIESCE); |
7777fab9 RW |
379 | if (error) |
380 | goto Finish; | |
381 | ||
a634cc10 RW |
382 | error = platform_pre_restore(platform_mode); |
383 | if (!error) { | |
384 | error = disable_nonboot_cpus(); | |
385 | if (!error) | |
72df68ca | 386 | error = resume_target_kernel(); |
a634cc10 RW |
387 | enable_nonboot_cpus(); |
388 | } | |
389 | platform_restore_cleanup(platform_mode); | |
1eede070 | 390 | device_resume(PMSG_RECOVER); |
10a1803d | 391 | Finish: |
41108eb1 | 392 | __ftrace_enabled_restore(ftrace_save); |
7777fab9 RW |
393 | resume_console(); |
394 | pm_restore_console(); | |
395 | return error; | |
396 | } | |
397 | ||
398 | /** | |
399 | * hibernation_platform_enter - enter the hibernation state using the | |
400 | * platform driver (if available) | |
401 | */ | |
402 | ||
403 | int hibernation_platform_enter(void) | |
404 | { | |
41108eb1 | 405 | int error, ftrace_save; |
b1457bcc | 406 | |
9cd9a005 RW |
407 | if (!hibernation_ops) |
408 | return -ENOSYS; | |
409 | ||
410 | /* | |
411 | * We have cancelled the power transition by running | |
412 | * hibernation_ops->finish() before saving the image, so we should let | |
413 | * the firmware know that we're going to enter the sleep state after all | |
414 | */ | |
caea99ef | 415 | error = hibernation_ops->begin(); |
9cd9a005 | 416 | if (error) |
caea99ef | 417 | goto Close; |
9cd9a005 RW |
418 | |
419 | suspend_console(); | |
41108eb1 | 420 | ftrace_save = __ftrace_enabled_save(); |
3a2d5b70 | 421 | error = device_suspend(PMSG_HIBERNATE); |
d8f3de0d RW |
422 | if (error) { |
423 | if (hibernation_ops->recover) | |
424 | hibernation_ops->recover(); | |
425 | goto Resume_devices; | |
426 | } | |
9cd9a005 RW |
427 | |
428 | error = hibernation_ops->prepare(); | |
429 | if (error) | |
430 | goto Resume_devices; | |
431 | ||
432 | error = disable_nonboot_cpus(); | |
433 | if (error) | |
434 | goto Finish; | |
435 | ||
1eede070 | 436 | device_pm_lock(); |
9cd9a005 | 437 | local_irq_disable(); |
3a2d5b70 | 438 | error = device_power_down(PMSG_HIBERNATE); |
9cd9a005 RW |
439 | if (!error) { |
440 | hibernation_ops->enter(); | |
441 | /* We should never get here */ | |
442 | while (1); | |
7777fab9 | 443 | } |
9cd9a005 | 444 | local_irq_enable(); |
1eede070 | 445 | device_pm_unlock(); |
9cd9a005 RW |
446 | |
447 | /* | |
448 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
449 | * the system is going to be halted anyway. | |
450 | */ | |
451 | Finish: | |
452 | hibernation_ops->finish(); | |
453 | Resume_devices: | |
1eede070 | 454 | device_resume(PMSG_RESTORE); |
41108eb1 | 455 | __ftrace_enabled_restore(ftrace_save); |
9cd9a005 | 456 | resume_console(); |
caea99ef RW |
457 | Close: |
458 | hibernation_ops->end(); | |
b1457bcc | 459 | return error; |
7777fab9 RW |
460 | } |
461 | ||
1da177e4 | 462 | /** |
a3d25c27 | 463 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 464 | * |
fe0c935a JB |
465 | * Use the platform driver, if configured so; otherwise try |
466 | * to power off or reboot. | |
1da177e4 LT |
467 | */ |
468 | ||
fe0c935a | 469 | static void power_down(void) |
1da177e4 | 470 | { |
a3d25c27 RW |
471 | switch (hibernation_mode) { |
472 | case HIBERNATION_TEST: | |
473 | case HIBERNATION_TESTPROC: | |
fe0c935a | 474 | break; |
a3d25c27 | 475 | case HIBERNATION_REBOOT: |
fdde86ac | 476 | kernel_restart(NULL); |
1da177e4 | 477 | break; |
a3d25c27 | 478 | case HIBERNATION_PLATFORM: |
7777fab9 | 479 | hibernation_platform_enter(); |
9cd9a005 RW |
480 | case HIBERNATION_SHUTDOWN: |
481 | kernel_power_off(); | |
482 | break; | |
1da177e4 | 483 | } |
fdde86ac | 484 | kernel_halt(); |
fe0c935a JB |
485 | /* |
486 | * Valid image is on the disk, if we continue we risk serious data | |
487 | * corruption after resume. | |
488 | */ | |
23976728 | 489 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
490 | while(1); |
491 | } | |
492 | ||
1da177e4 LT |
493 | static int prepare_processes(void) |
494 | { | |
b918f6e6 | 495 | int error = 0; |
1da177e4 | 496 | |
1da177e4 LT |
497 | if (freeze_processes()) { |
498 | error = -EBUSY; | |
5a0a2f30 | 499 | thaw_processes(); |
1da177e4 | 500 | } |
5a72e04d | 501 | return error; |
1da177e4 LT |
502 | } |
503 | ||
1da177e4 | 504 | /** |
a3d25c27 | 505 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
506 | */ |
507 | ||
a3d25c27 | 508 | int hibernate(void) |
1da177e4 LT |
509 | { |
510 | int error; | |
511 | ||
b10d9117 | 512 | mutex_lock(&pm_mutex); |
0709db60 | 513 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
514 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
515 | error = -EBUSY; | |
516 | goto Unlock; | |
517 | } | |
518 | ||
5a0a2f30 | 519 | pm_prepare_console(); |
b10d9117 RW |
520 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
521 | if (error) | |
522 | goto Exit; | |
0709db60 | 523 | |
1bfcf130 RW |
524 | error = usermodehelper_disable(); |
525 | if (error) | |
526 | goto Exit; | |
527 | ||
0709db60 RW |
528 | /* Allocate memory management structures */ |
529 | error = create_basic_memory_bitmaps(); | |
530 | if (error) | |
531 | goto Exit; | |
532 | ||
23976728 | 533 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
534 | sys_sync(); |
535 | printk("done.\n"); | |
536 | ||
1da177e4 | 537 | error = prepare_processes(); |
5a72e04d | 538 | if (error) |
0709db60 | 539 | goto Finish; |
1da177e4 | 540 | |
4cc79776 | 541 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 542 | goto Thaw; |
4cc79776 RW |
543 | |
544 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
545 | goto Thaw; | |
546 | ||
7777fab9 RW |
547 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
548 | if (in_suspend && !error) { | |
a634cc10 RW |
549 | unsigned int flags = 0; |
550 | ||
551 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
552 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 553 | pr_debug("PM: writing image.\n"); |
a634cc10 | 554 | error = swsusp_write(flags); |
7777fab9 | 555 | swsusp_free(); |
1da177e4 | 556 | if (!error) |
fe0c935a | 557 | power_down(); |
b918f6e6 | 558 | } else { |
1da177e4 | 559 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 560 | swsusp_free(); |
b918f6e6 | 561 | } |
b918f6e6 | 562 | Thaw: |
5a0a2f30 | 563 | thaw_processes(); |
0709db60 RW |
564 | Finish: |
565 | free_basic_memory_bitmaps(); | |
1bfcf130 | 566 | usermodehelper_enable(); |
0709db60 | 567 | Exit: |
b10d9117 | 568 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 569 | pm_restore_console(); |
0709db60 | 570 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
571 | Unlock: |
572 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
573 | return error; |
574 | } | |
575 | ||
576 | ||
577 | /** | |
578 | * software_resume - Resume from a saved image. | |
579 | * | |
580 | * Called as a late_initcall (so all devices are discovered and | |
581 | * initialized), we call swsusp to see if we have a saved image or not. | |
582 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 583 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
584 | * Otherwise, we fail gracefully and return to the normally |
585 | * scheduled program. | |
586 | * | |
587 | */ | |
588 | ||
589 | static int software_resume(void) | |
590 | { | |
591 | int error; | |
a634cc10 | 592 | unsigned int flags; |
1da177e4 | 593 | |
60a0d233 JB |
594 | /* |
595 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
596 | * is configured into the kernel. Since the regular hibernate | |
597 | * trigger path is via sysfs which takes a buffer mutex before | |
598 | * calling hibernate functions (which take pm_mutex) this can | |
599 | * cause lockdep to complain about a possible ABBA deadlock | |
600 | * which cannot happen since we're in the boot code here and | |
601 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
602 | * here to avoid lockdep complaining. | |
603 | */ | |
604 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
3efa147a | 605 | if (!swsusp_resume_device) { |
dd5d666b | 606 | if (!strlen(resume_file)) { |
a6d70980 | 607 | mutex_unlock(&pm_mutex); |
3efa147a | 608 | return -ENOENT; |
dd5d666b | 609 | } |
3efa147a | 610 | swsusp_resume_device = name_to_dev_t(resume_file); |
23976728 | 611 | pr_debug("PM: Resume from partition %s\n", resume_file); |
3efa147a | 612 | } else { |
23976728 RW |
613 | pr_debug("PM: Resume from partition %d:%d\n", |
614 | MAJOR(swsusp_resume_device), | |
615 | MINOR(swsusp_resume_device)); | |
3efa147a PM |
616 | } |
617 | ||
1da177e4 LT |
618 | if (noresume) { |
619 | /** | |
9575809c RW |
620 | * FIXME: If noresume is specified, we need to find the |
621 | * partition and reset it back to normal swap space. | |
1da177e4 | 622 | */ |
a6d70980 | 623 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
624 | return 0; |
625 | } | |
626 | ||
23976728 | 627 | pr_debug("PM: Checking hibernation image.\n"); |
ed746e3b RW |
628 | error = swsusp_check(); |
629 | if (error) | |
74dfd666 | 630 | goto Unlock; |
1da177e4 | 631 | |
0709db60 RW |
632 | /* The snapshot device should not be opened while we're running */ |
633 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
634 | error = -EBUSY; | |
635 | goto Unlock; | |
636 | } | |
637 | ||
5a0a2f30 | 638 | pm_prepare_console(); |
c3e94d89 AS |
639 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
640 | if (error) | |
641 | goto Finish; | |
642 | ||
1bfcf130 RW |
643 | error = usermodehelper_disable(); |
644 | if (error) | |
645 | goto Finish; | |
646 | ||
74dfd666 RW |
647 | error = create_basic_memory_bitmaps(); |
648 | if (error) | |
0709db60 | 649 | goto Finish; |
1da177e4 | 650 | |
74dfd666 | 651 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
652 | error = prepare_processes(); |
653 | if (error) { | |
1da177e4 | 654 | swsusp_close(); |
5a72e04d | 655 | goto Done; |
1da177e4 LT |
656 | } |
657 | ||
23976728 | 658 | pr_debug("PM: Reading hibernation image.\n"); |
1da177e4 | 659 | |
a634cc10 | 660 | error = swsusp_read(&flags); |
ed746e3b | 661 | if (!error) |
a634cc10 | 662 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 663 | |
ed746e3b | 664 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 665 | swsusp_free(); |
5a0a2f30 | 666 | thaw_processes(); |
1da177e4 | 667 | Done: |
74dfd666 | 668 | free_basic_memory_bitmaps(); |
1bfcf130 | 669 | usermodehelper_enable(); |
0709db60 | 670 | Finish: |
c3e94d89 | 671 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 672 | pm_restore_console(); |
0709db60 | 673 | atomic_inc(&snapshot_device_available); |
dd5d666b | 674 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 675 | Unlock: |
a6d70980 | 676 | mutex_unlock(&pm_mutex); |
1da177e4 | 677 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 678 | return error; |
1da177e4 LT |
679 | } |
680 | ||
681 | late_initcall(software_resume); | |
682 | ||
683 | ||
a3d25c27 RW |
684 | static const char * const hibernation_modes[] = { |
685 | [HIBERNATION_PLATFORM] = "platform", | |
686 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
687 | [HIBERNATION_REBOOT] = "reboot", | |
688 | [HIBERNATION_TEST] = "test", | |
689 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
690 | }; |
691 | ||
692 | /** | |
a3d25c27 | 693 | * disk - Control hibernation mode |
1da177e4 | 694 | * |
11d77d0c JB |
695 | * Suspend-to-disk can be handled in several ways. We have a few options |
696 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
697 | * or other hibernation_ops), powering off the system or rebooting the |
698 | * system (for testing) as well as the two test modes. | |
1da177e4 | 699 | * |
11d77d0c | 700 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
701 | * encoded by the presence of hibernation_ops). However, the user may |
702 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
703 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
704 | * |
705 | * show() will display what the mode is currently set to. | |
706 | * store() will accept one of | |
707 | * | |
1da177e4 LT |
708 | * 'platform' |
709 | * 'shutdown' | |
710 | * 'reboot' | |
11d77d0c JB |
711 | * 'test' |
712 | * 'testproc' | |
1da177e4 | 713 | * |
11d77d0c | 714 | * It will only change to 'platform' if the system |
a3d25c27 | 715 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
716 | */ |
717 | ||
386f275f KS |
718 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
719 | char *buf) | |
1da177e4 | 720 | { |
f0ced9b2 JB |
721 | int i; |
722 | char *start = buf; | |
723 | ||
a3d25c27 RW |
724 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
725 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
726 | continue; |
727 | switch (i) { | |
a3d25c27 RW |
728 | case HIBERNATION_SHUTDOWN: |
729 | case HIBERNATION_REBOOT: | |
730 | case HIBERNATION_TEST: | |
731 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 732 | break; |
a3d25c27 RW |
733 | case HIBERNATION_PLATFORM: |
734 | if (hibernation_ops) | |
f0ced9b2 JB |
735 | break; |
736 | /* not a valid mode, continue with loop */ | |
737 | continue; | |
738 | } | |
a3d25c27 RW |
739 | if (i == hibernation_mode) |
740 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 741 | else |
a3d25c27 | 742 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
743 | } |
744 | buf += sprintf(buf, "\n"); | |
745 | return buf-start; | |
1da177e4 LT |
746 | } |
747 | ||
748 | ||
386f275f KS |
749 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
750 | const char *buf, size_t n) | |
1da177e4 LT |
751 | { |
752 | int error = 0; | |
753 | int i; | |
754 | int len; | |
755 | char *p; | |
a3d25c27 | 756 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
757 | |
758 | p = memchr(buf, '\n', n); | |
759 | len = p ? p - buf : n; | |
760 | ||
a6d70980 | 761 | mutex_lock(&pm_mutex); |
a3d25c27 | 762 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
763 | if (len == strlen(hibernation_modes[i]) |
764 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
765 | mode = i; |
766 | break; | |
767 | } | |
768 | } | |
a3d25c27 | 769 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 770 | switch (mode) { |
a3d25c27 RW |
771 | case HIBERNATION_SHUTDOWN: |
772 | case HIBERNATION_REBOOT: | |
773 | case HIBERNATION_TEST: | |
774 | case HIBERNATION_TESTPROC: | |
775 | hibernation_mode = mode; | |
fe0c935a | 776 | break; |
a3d25c27 RW |
777 | case HIBERNATION_PLATFORM: |
778 | if (hibernation_ops) | |
779 | hibernation_mode = mode; | |
1da177e4 LT |
780 | else |
781 | error = -EINVAL; | |
782 | } | |
a3d25c27 | 783 | } else |
1da177e4 LT |
784 | error = -EINVAL; |
785 | ||
a3d25c27 | 786 | if (!error) |
23976728 | 787 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 788 | hibernation_modes[mode]); |
a6d70980 | 789 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
790 | return error ? error : n; |
791 | } | |
792 | ||
793 | power_attr(disk); | |
794 | ||
386f275f KS |
795 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
796 | char *buf) | |
1da177e4 LT |
797 | { |
798 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
799 | MINOR(swsusp_resume_device)); | |
800 | } | |
801 | ||
386f275f KS |
802 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
803 | const char *buf, size_t n) | |
1da177e4 | 804 | { |
1da177e4 | 805 | unsigned int maj, min; |
1da177e4 | 806 | dev_t res; |
a576219a | 807 | int ret = -EINVAL; |
1da177e4 | 808 | |
a576219a AM |
809 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
810 | goto out; | |
1da177e4 | 811 | |
a576219a AM |
812 | res = MKDEV(maj,min); |
813 | if (maj != MAJOR(res) || min != MINOR(res)) | |
814 | goto out; | |
1da177e4 | 815 | |
a6d70980 | 816 | mutex_lock(&pm_mutex); |
a576219a | 817 | swsusp_resume_device = res; |
a6d70980 | 818 | mutex_unlock(&pm_mutex); |
23976728 | 819 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
820 | noresume = 0; |
821 | software_resume(); | |
822 | ret = n; | |
59a49335 | 823 | out: |
a576219a | 824 | return ret; |
1da177e4 LT |
825 | } |
826 | ||
827 | power_attr(resume); | |
828 | ||
386f275f KS |
829 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
830 | char *buf) | |
ca0aec0f | 831 | { |
853609b6 | 832 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
833 | } |
834 | ||
386f275f KS |
835 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
836 | const char *buf, size_t n) | |
ca0aec0f | 837 | { |
853609b6 | 838 | unsigned long size; |
ca0aec0f | 839 | |
853609b6 | 840 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
841 | image_size = size; |
842 | return n; | |
843 | } | |
844 | ||
845 | return -EINVAL; | |
846 | } | |
847 | ||
848 | power_attr(image_size); | |
849 | ||
1da177e4 LT |
850 | static struct attribute * g[] = { |
851 | &disk_attr.attr, | |
852 | &resume_attr.attr, | |
ca0aec0f | 853 | &image_size_attr.attr, |
1da177e4 LT |
854 | NULL, |
855 | }; | |
856 | ||
857 | ||
858 | static struct attribute_group attr_group = { | |
859 | .attrs = g, | |
860 | }; | |
861 | ||
862 | ||
863 | static int __init pm_disk_init(void) | |
864 | { | |
d76e15fb | 865 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
866 | } |
867 | ||
868 | core_initcall(pm_disk_init); | |
869 | ||
870 | ||
871 | static int __init resume_setup(char *str) | |
872 | { | |
873 | if (noresume) | |
874 | return 1; | |
875 | ||
876 | strncpy( resume_file, str, 255 ); | |
877 | return 1; | |
878 | } | |
879 | ||
9a154d9d RW |
880 | static int __init resume_offset_setup(char *str) |
881 | { | |
882 | unsigned long long offset; | |
883 | ||
884 | if (noresume) | |
885 | return 1; | |
886 | ||
887 | if (sscanf(str, "%llu", &offset) == 1) | |
888 | swsusp_resume_block = offset; | |
889 | ||
890 | return 1; | |
891 | } | |
892 | ||
1da177e4 LT |
893 | static int __init noresume_setup(char *str) |
894 | { | |
895 | noresume = 1; | |
896 | return 1; | |
897 | } | |
898 | ||
899 | __setup("noresume", noresume_setup); | |
9a154d9d | 900 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 901 | __setup("resume=", resume_setup); |