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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> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/fs.h> | |
d53d9f16 | 19 | #include <linux/mount.h> |
88d10bba | 20 | #include <linux/pm.h> |
97c7801c | 21 | #include <linux/console.h> |
e3920fb4 | 22 | #include <linux/cpu.h> |
7dfb7103 | 23 | #include <linux/freezer.h> |
d53d9f16 | 24 | |
1da177e4 LT |
25 | #include "power.h" |
26 | ||
27 | ||
1da177e4 | 28 | static int noresume = 0; |
47a460d5 | 29 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
1da177e4 | 30 | dev_t swsusp_resume_device; |
9a154d9d | 31 | sector_t swsusp_resume_block; |
1da177e4 | 32 | |
a3d25c27 RW |
33 | enum { |
34 | HIBERNATION_INVALID, | |
35 | HIBERNATION_PLATFORM, | |
36 | HIBERNATION_TEST, | |
37 | HIBERNATION_TESTPROC, | |
38 | HIBERNATION_SHUTDOWN, | |
39 | HIBERNATION_REBOOT, | |
40 | /* keep last */ | |
41 | __HIBERNATION_AFTER_LAST | |
42 | }; | |
43 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) | |
44 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) | |
45 | ||
46 | static int hibernation_mode = HIBERNATION_SHUTDOWN; | |
47 | ||
b3dac3b3 | 48 | static struct platform_hibernation_ops *hibernation_ops; |
a3d25c27 RW |
49 | |
50 | /** | |
51 | * hibernation_set_ops - set the global hibernate operations | |
52 | * @ops: the hibernation operations to use in subsequent hibernation transitions | |
53 | */ | |
54 | ||
b3dac3b3 | 55 | void hibernation_set_ops(struct platform_hibernation_ops *ops) |
a3d25c27 | 56 | { |
caea99ef RW |
57 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
58 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore | |
74f270af | 59 | && ops->restore_cleanup)) { |
a3d25c27 RW |
60 | WARN_ON(1); |
61 | return; | |
62 | } | |
63 | mutex_lock(&pm_mutex); | |
64 | hibernation_ops = ops; | |
65 | if (ops) | |
66 | hibernation_mode = HIBERNATION_PLATFORM; | |
67 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
68 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
69 | ||
70 | mutex_unlock(&pm_mutex); | |
71 | } | |
72 | ||
4cc79776 RW |
73 | #ifdef CONFIG_PM_DEBUG |
74 | static void hibernation_debug_sleep(void) | |
75 | { | |
76 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); | |
77 | mdelay(5000); | |
78 | } | |
79 | ||
80 | static int hibernation_testmode(int mode) | |
81 | { | |
82 | if (hibernation_mode == mode) { | |
83 | hibernation_debug_sleep(); | |
84 | return 1; | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static int hibernation_test(int level) | |
90 | { | |
91 | if (pm_test_level == level) { | |
92 | hibernation_debug_sleep(); | |
93 | return 1; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | #else /* !CONFIG_PM_DEBUG */ | |
98 | static int hibernation_testmode(int mode) { return 0; } | |
99 | static int hibernation_test(int level) { return 0; } | |
100 | #endif /* !CONFIG_PM_DEBUG */ | |
101 | ||
74f270af | 102 | /** |
caea99ef | 103 | * platform_begin - tell the platform driver that we're starting |
74f270af RW |
104 | * hibernation |
105 | */ | |
106 | ||
caea99ef | 107 | static int platform_begin(int platform_mode) |
74f270af RW |
108 | { |
109 | return (platform_mode && hibernation_ops) ? | |
caea99ef RW |
110 | hibernation_ops->begin() : 0; |
111 | } | |
112 | ||
113 | /** | |
114 | * platform_end - tell the platform driver that we've entered the | |
115 | * working state | |
116 | */ | |
117 | ||
118 | static void platform_end(int platform_mode) | |
119 | { | |
120 | if (platform_mode && hibernation_ops) | |
121 | hibernation_ops->end(); | |
74f270af | 122 | } |
a3d25c27 | 123 | |
8a05aac2 | 124 | /** |
74f270af | 125 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
126 | * platform driver if so configured and return an error code if it fails |
127 | */ | |
128 | ||
74f270af | 129 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 130 | { |
7777fab9 | 131 | return (platform_mode && hibernation_ops) ? |
74f270af | 132 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 133 | } |
8a05aac2 | 134 | |
c7e0831d RW |
135 | /** |
136 | * platform_leave - prepare the machine for switching to the normal mode | |
137 | * of operation using the platform driver (called with interrupts disabled) | |
138 | */ | |
139 | ||
140 | static void platform_leave(int platform_mode) | |
141 | { | |
142 | if (platform_mode && hibernation_ops) | |
143 | hibernation_ops->leave(); | |
144 | } | |
145 | ||
a3d25c27 RW |
146 | /** |
147 | * platform_finish - switch the machine to the normal mode of operation | |
148 | * using the platform driver (must be called after platform_prepare()) | |
149 | */ | |
150 | ||
7777fab9 | 151 | static void platform_finish(int platform_mode) |
a3d25c27 | 152 | { |
7777fab9 | 153 | if (platform_mode && hibernation_ops) |
a3d25c27 | 154 | hibernation_ops->finish(); |
8a05aac2 SS |
155 | } |
156 | ||
a634cc10 RW |
157 | /** |
158 | * platform_pre_restore - prepare the platform for the restoration from a | |
159 | * hibernation image. If the restore fails after this function has been | |
160 | * called, platform_restore_cleanup() must be called. | |
161 | */ | |
162 | ||
163 | static int platform_pre_restore(int platform_mode) | |
164 | { | |
165 | return (platform_mode && hibernation_ops) ? | |
166 | hibernation_ops->pre_restore() : 0; | |
167 | } | |
168 | ||
169 | /** | |
170 | * platform_restore_cleanup - switch the platform to the normal mode of | |
171 | * operation after a failing restore. If platform_pre_restore() has been | |
172 | * called before the failing restore, this function must be called too, | |
173 | * regardless of the result of platform_pre_restore(). | |
174 | */ | |
175 | ||
176 | static void platform_restore_cleanup(int platform_mode) | |
177 | { | |
178 | if (platform_mode && hibernation_ops) | |
179 | hibernation_ops->restore_cleanup(); | |
180 | } | |
181 | ||
c7e0831d RW |
182 | /** |
183 | * create_image - freeze devices that need to be frozen with interrupts | |
184 | * off, create the hibernation image and thaw those devices. Control | |
185 | * reappears in this routine after a restore. | |
186 | */ | |
187 | ||
47a460d5 | 188 | static int create_image(int platform_mode) |
c7e0831d RW |
189 | { |
190 | int error; | |
191 | ||
192 | error = arch_prepare_suspend(); | |
193 | if (error) | |
194 | return error; | |
195 | ||
1eede070 | 196 | device_pm_lock(); |
c7e0831d RW |
197 | local_irq_disable(); |
198 | /* At this point, device_suspend() has been called, but *not* | |
199 | * device_power_down(). We *must* call device_power_down() now. | |
200 | * Otherwise, drivers for some devices (e.g. interrupt controllers) | |
201 | * become desynchronized with the actual state of the hardware | |
202 | * at resume time, and evil weirdness ensues. | |
203 | */ | |
204 | error = device_power_down(PMSG_FREEZE); | |
205 | if (error) { | |
23976728 RW |
206 | printk(KERN_ERR "PM: Some devices failed to power down, " |
207 | "aborting hibernation\n"); | |
c7e0831d RW |
208 | goto Enable_irqs; |
209 | } | |
210 | ||
4cc79776 RW |
211 | if (hibernation_test(TEST_CORE)) |
212 | goto Power_up; | |
213 | ||
214 | in_suspend = 1; | |
c7e0831d RW |
215 | save_processor_state(); |
216 | error = swsusp_arch_suspend(); | |
217 | if (error) | |
23976728 RW |
218 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
219 | error); | |
c7e0831d RW |
220 | /* Restore control flow magically appears here */ |
221 | restore_processor_state(); | |
222 | if (!in_suspend) | |
223 | platform_leave(platform_mode); | |
4cc79776 | 224 | Power_up: |
c7e0831d RW |
225 | /* NOTE: device_power_up() is just a resume() for devices |
226 | * that suspended with irqs off ... no overall powerup. | |
227 | */ | |
1eede070 RW |
228 | device_power_up(in_suspend ? |
229 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
c7e0831d RW |
230 | Enable_irqs: |
231 | local_irq_enable(); | |
1eede070 | 232 | device_pm_unlock(); |
c7e0831d RW |
233 | return error; |
234 | } | |
235 | ||
7777fab9 RW |
236 | /** |
237 | * hibernation_snapshot - quiesce devices and create the hibernation | |
238 | * snapshot image. | |
239 | * @platform_mode - if set, use the platform driver, if available, to | |
240 | * prepare the platform frimware for the power transition. | |
241 | * | |
242 | * Must be called with pm_mutex held | |
243 | */ | |
244 | ||
245 | int hibernation_snapshot(int platform_mode) | |
246 | { | |
247 | int error; | |
248 | ||
249 | /* Free memory before shutting down devices. */ | |
250 | error = swsusp_shrink_memory(); | |
251 | if (error) | |
10a1803d | 252 | return error; |
7777fab9 | 253 | |
caea99ef | 254 | error = platform_begin(platform_mode); |
74f270af | 255 | if (error) |
caea99ef | 256 | goto Close; |
74f270af | 257 | |
7777fab9 RW |
258 | suspend_console(); |
259 | error = device_suspend(PMSG_FREEZE); | |
10a1803d RW |
260 | if (error) |
261 | goto Resume_console; | |
262 | ||
4cc79776 | 263 | if (hibernation_test(TEST_DEVICES)) |
7777fab9 RW |
264 | goto Resume_devices; |
265 | ||
4cc79776 RW |
266 | error = platform_pre_snapshot(platform_mode); |
267 | if (error || hibernation_test(TEST_PLATFORM)) | |
268 | goto Finish; | |
269 | ||
7777fab9 RW |
270 | error = disable_nonboot_cpus(); |
271 | if (!error) { | |
4cc79776 RW |
272 | if (hibernation_test(TEST_CPUS)) |
273 | goto Enable_cpus; | |
274 | ||
275 | if (hibernation_testmode(HIBERNATION_TEST)) | |
276 | goto Enable_cpus; | |
277 | ||
278 | error = create_image(platform_mode); | |
279 | /* Control returns here after successful restore */ | |
7777fab9 | 280 | } |
4cc79776 | 281 | Enable_cpus: |
7777fab9 | 282 | enable_nonboot_cpus(); |
4cc79776 | 283 | Finish: |
7777fab9 | 284 | platform_finish(platform_mode); |
4cc79776 | 285 | Resume_devices: |
1eede070 RW |
286 | device_resume(in_suspend ? |
287 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); | |
10a1803d | 288 | Resume_console: |
7777fab9 | 289 | resume_console(); |
caea99ef RW |
290 | Close: |
291 | platform_end(platform_mode); | |
7777fab9 RW |
292 | return error; |
293 | } | |
294 | ||
72df68ca RW |
295 | /** |
296 | * resume_target_kernel - prepare devices that need to be suspended with | |
297 | * interrupts off, restore the contents of highmem that have not been | |
298 | * restored yet from the image and run the low level code that will restore | |
299 | * the remaining contents of memory and switch to the just restored target | |
300 | * kernel. | |
301 | */ | |
302 | ||
303 | static int resume_target_kernel(void) | |
304 | { | |
305 | int error; | |
306 | ||
1eede070 | 307 | device_pm_lock(); |
72df68ca | 308 | local_irq_disable(); |
1eede070 | 309 | error = device_power_down(PMSG_QUIESCE); |
72df68ca | 310 | if (error) { |
23976728 | 311 | printk(KERN_ERR "PM: Some devices failed to power down, " |
72df68ca RW |
312 | "aborting resume\n"); |
313 | goto Enable_irqs; | |
314 | } | |
315 | /* We'll ignore saved state, but this gets preempt count (etc) right */ | |
316 | save_processor_state(); | |
317 | error = restore_highmem(); | |
318 | if (!error) { | |
319 | error = swsusp_arch_resume(); | |
320 | /* | |
321 | * The code below is only ever reached in case of a failure. | |
322 | * Otherwise execution continues at place where | |
323 | * swsusp_arch_suspend() was called | |
324 | */ | |
325 | BUG_ON(!error); | |
326 | /* This call to restore_highmem() undos the previous one */ | |
327 | restore_highmem(); | |
328 | } | |
329 | /* | |
330 | * The only reason why swsusp_arch_resume() can fail is memory being | |
331 | * very tight, so we have to free it as soon as we can to avoid | |
332 | * subsequent failures | |
333 | */ | |
334 | swsusp_free(); | |
335 | restore_processor_state(); | |
336 | touch_softlockup_watchdog(); | |
1eede070 | 337 | device_power_up(PMSG_RECOVER); |
72df68ca RW |
338 | Enable_irqs: |
339 | local_irq_enable(); | |
1eede070 | 340 | device_pm_unlock(); |
72df68ca RW |
341 | return error; |
342 | } | |
343 | ||
7777fab9 RW |
344 | /** |
345 | * hibernation_restore - quiesce devices and restore the hibernation | |
346 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
347 | * @platform_mode - if set, use the platform driver, if available, to |
348 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
349 | * |
350 | * Must be called with pm_mutex held | |
351 | */ | |
352 | ||
a634cc10 | 353 | int hibernation_restore(int platform_mode) |
7777fab9 RW |
354 | { |
355 | int error; | |
356 | ||
357 | pm_prepare_console(); | |
358 | suspend_console(); | |
1eede070 | 359 | error = device_suspend(PMSG_QUIESCE); |
7777fab9 RW |
360 | if (error) |
361 | goto Finish; | |
362 | ||
a634cc10 RW |
363 | error = platform_pre_restore(platform_mode); |
364 | if (!error) { | |
365 | error = disable_nonboot_cpus(); | |
366 | if (!error) | |
72df68ca | 367 | error = resume_target_kernel(); |
a634cc10 RW |
368 | enable_nonboot_cpus(); |
369 | } | |
370 | platform_restore_cleanup(platform_mode); | |
1eede070 | 371 | device_resume(PMSG_RECOVER); |
10a1803d | 372 | Finish: |
7777fab9 RW |
373 | resume_console(); |
374 | pm_restore_console(); | |
375 | return error; | |
376 | } | |
377 | ||
378 | /** | |
379 | * hibernation_platform_enter - enter the hibernation state using the | |
380 | * platform driver (if available) | |
381 | */ | |
382 | ||
383 | int hibernation_platform_enter(void) | |
384 | { | |
b1457bcc RW |
385 | int error; |
386 | ||
9cd9a005 RW |
387 | if (!hibernation_ops) |
388 | return -ENOSYS; | |
389 | ||
390 | /* | |
391 | * We have cancelled the power transition by running | |
392 | * hibernation_ops->finish() before saving the image, so we should let | |
393 | * the firmware know that we're going to enter the sleep state after all | |
394 | */ | |
caea99ef | 395 | error = hibernation_ops->begin(); |
9cd9a005 | 396 | if (error) |
caea99ef | 397 | goto Close; |
9cd9a005 RW |
398 | |
399 | suspend_console(); | |
3a2d5b70 | 400 | error = device_suspend(PMSG_HIBERNATE); |
9cd9a005 RW |
401 | if (error) |
402 | goto Resume_console; | |
403 | ||
404 | error = hibernation_ops->prepare(); | |
405 | if (error) | |
406 | goto Resume_devices; | |
407 | ||
408 | error = disable_nonboot_cpus(); | |
409 | if (error) | |
410 | goto Finish; | |
411 | ||
1eede070 | 412 | device_pm_lock(); |
9cd9a005 | 413 | local_irq_disable(); |
3a2d5b70 | 414 | error = device_power_down(PMSG_HIBERNATE); |
9cd9a005 RW |
415 | if (!error) { |
416 | hibernation_ops->enter(); | |
417 | /* We should never get here */ | |
418 | while (1); | |
7777fab9 | 419 | } |
9cd9a005 | 420 | local_irq_enable(); |
1eede070 | 421 | device_pm_unlock(); |
9cd9a005 RW |
422 | |
423 | /* | |
424 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
425 | * the system is going to be halted anyway. | |
426 | */ | |
427 | Finish: | |
428 | hibernation_ops->finish(); | |
429 | Resume_devices: | |
1eede070 | 430 | device_resume(PMSG_RESTORE); |
9cd9a005 RW |
431 | Resume_console: |
432 | resume_console(); | |
caea99ef RW |
433 | Close: |
434 | hibernation_ops->end(); | |
b1457bcc | 435 | return error; |
7777fab9 RW |
436 | } |
437 | ||
1da177e4 | 438 | /** |
a3d25c27 | 439 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 440 | * |
fe0c935a JB |
441 | * Use the platform driver, if configured so; otherwise try |
442 | * to power off or reboot. | |
1da177e4 LT |
443 | */ |
444 | ||
fe0c935a | 445 | static void power_down(void) |
1da177e4 | 446 | { |
a3d25c27 RW |
447 | switch (hibernation_mode) { |
448 | case HIBERNATION_TEST: | |
449 | case HIBERNATION_TESTPROC: | |
fe0c935a | 450 | break; |
a3d25c27 | 451 | case HIBERNATION_REBOOT: |
fdde86ac | 452 | kernel_restart(NULL); |
1da177e4 | 453 | break; |
a3d25c27 | 454 | case HIBERNATION_PLATFORM: |
7777fab9 | 455 | hibernation_platform_enter(); |
9cd9a005 RW |
456 | case HIBERNATION_SHUTDOWN: |
457 | kernel_power_off(); | |
458 | break; | |
1da177e4 | 459 | } |
fdde86ac | 460 | kernel_halt(); |
fe0c935a JB |
461 | /* |
462 | * Valid image is on the disk, if we continue we risk serious data | |
463 | * corruption after resume. | |
464 | */ | |
23976728 | 465 | printk(KERN_CRIT "PM: Please power down manually\n"); |
1da177e4 LT |
466 | while(1); |
467 | } | |
468 | ||
1da177e4 LT |
469 | static int prepare_processes(void) |
470 | { | |
b918f6e6 | 471 | int error = 0; |
1da177e4 | 472 | |
1da177e4 LT |
473 | if (freeze_processes()) { |
474 | error = -EBUSY; | |
5a0a2f30 | 475 | thaw_processes(); |
1da177e4 | 476 | } |
5a72e04d | 477 | return error; |
1da177e4 LT |
478 | } |
479 | ||
1da177e4 | 480 | /** |
a3d25c27 | 481 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
482 | */ |
483 | ||
a3d25c27 | 484 | int hibernate(void) |
1da177e4 LT |
485 | { |
486 | int error; | |
487 | ||
b10d9117 | 488 | mutex_lock(&pm_mutex); |
0709db60 | 489 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
490 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
491 | error = -EBUSY; | |
492 | goto Unlock; | |
493 | } | |
494 | ||
5a0a2f30 | 495 | pm_prepare_console(); |
b10d9117 RW |
496 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
497 | if (error) | |
498 | goto Exit; | |
0709db60 RW |
499 | |
500 | /* Allocate memory management structures */ | |
501 | error = create_basic_memory_bitmaps(); | |
502 | if (error) | |
503 | goto Exit; | |
504 | ||
23976728 | 505 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
506 | sys_sync(); |
507 | printk("done.\n"); | |
508 | ||
1da177e4 | 509 | error = prepare_processes(); |
5a72e04d | 510 | if (error) |
0709db60 | 511 | goto Finish; |
1da177e4 | 512 | |
4cc79776 | 513 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 514 | goto Thaw; |
4cc79776 RW |
515 | |
516 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
517 | goto Thaw; | |
518 | ||
7777fab9 RW |
519 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
520 | if (in_suspend && !error) { | |
a634cc10 RW |
521 | unsigned int flags = 0; |
522 | ||
523 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
524 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 525 | pr_debug("PM: writing image.\n"); |
a634cc10 | 526 | error = swsusp_write(flags); |
7777fab9 | 527 | swsusp_free(); |
1da177e4 | 528 | if (!error) |
fe0c935a | 529 | power_down(); |
b918f6e6 | 530 | } else { |
1da177e4 | 531 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 532 | swsusp_free(); |
b918f6e6 | 533 | } |
b918f6e6 | 534 | Thaw: |
5a0a2f30 | 535 | thaw_processes(); |
0709db60 RW |
536 | Finish: |
537 | free_basic_memory_bitmaps(); | |
538 | Exit: | |
b10d9117 | 539 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
5a0a2f30 | 540 | pm_restore_console(); |
0709db60 | 541 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
542 | Unlock: |
543 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
544 | return error; |
545 | } | |
546 | ||
547 | ||
548 | /** | |
549 | * software_resume - Resume from a saved image. | |
550 | * | |
551 | * Called as a late_initcall (so all devices are discovered and | |
552 | * initialized), we call swsusp to see if we have a saved image or not. | |
553 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 554 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
555 | * Otherwise, we fail gracefully and return to the normally |
556 | * scheduled program. | |
557 | * | |
558 | */ | |
559 | ||
560 | static int software_resume(void) | |
561 | { | |
562 | int error; | |
a634cc10 | 563 | unsigned int flags; |
1da177e4 | 564 | |
60a0d233 JB |
565 | /* |
566 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
567 | * is configured into the kernel. Since the regular hibernate | |
568 | * trigger path is via sysfs which takes a buffer mutex before | |
569 | * calling hibernate functions (which take pm_mutex) this can | |
570 | * cause lockdep to complain about a possible ABBA deadlock | |
571 | * which cannot happen since we're in the boot code here and | |
572 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
573 | * here to avoid lockdep complaining. | |
574 | */ | |
575 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
3efa147a | 576 | if (!swsusp_resume_device) { |
dd5d666b | 577 | if (!strlen(resume_file)) { |
a6d70980 | 578 | mutex_unlock(&pm_mutex); |
3efa147a | 579 | return -ENOENT; |
dd5d666b | 580 | } |
3efa147a | 581 | swsusp_resume_device = name_to_dev_t(resume_file); |
23976728 | 582 | pr_debug("PM: Resume from partition %s\n", resume_file); |
3efa147a | 583 | } else { |
23976728 RW |
584 | pr_debug("PM: Resume from partition %d:%d\n", |
585 | MAJOR(swsusp_resume_device), | |
586 | MINOR(swsusp_resume_device)); | |
3efa147a PM |
587 | } |
588 | ||
1da177e4 LT |
589 | if (noresume) { |
590 | /** | |
9575809c RW |
591 | * FIXME: If noresume is specified, we need to find the |
592 | * partition and reset it back to normal swap space. | |
1da177e4 | 593 | */ |
a6d70980 | 594 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
595 | return 0; |
596 | } | |
597 | ||
23976728 | 598 | pr_debug("PM: Checking hibernation image.\n"); |
ed746e3b RW |
599 | error = swsusp_check(); |
600 | if (error) | |
74dfd666 | 601 | goto Unlock; |
1da177e4 | 602 | |
0709db60 RW |
603 | /* The snapshot device should not be opened while we're running */ |
604 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
605 | error = -EBUSY; | |
606 | goto Unlock; | |
607 | } | |
608 | ||
5a0a2f30 | 609 | pm_prepare_console(); |
c3e94d89 AS |
610 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
611 | if (error) | |
612 | goto Finish; | |
613 | ||
74dfd666 RW |
614 | error = create_basic_memory_bitmaps(); |
615 | if (error) | |
0709db60 | 616 | goto Finish; |
1da177e4 | 617 | |
74dfd666 | 618 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
619 | error = prepare_processes(); |
620 | if (error) { | |
1da177e4 | 621 | swsusp_close(); |
5a72e04d | 622 | goto Done; |
1da177e4 LT |
623 | } |
624 | ||
23976728 | 625 | pr_debug("PM: Reading hibernation image.\n"); |
1da177e4 | 626 | |
a634cc10 | 627 | error = swsusp_read(&flags); |
ed746e3b | 628 | if (!error) |
a634cc10 | 629 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 630 | |
ed746e3b | 631 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 632 | swsusp_free(); |
5a0a2f30 | 633 | thaw_processes(); |
1da177e4 | 634 | Done: |
74dfd666 | 635 | free_basic_memory_bitmaps(); |
0709db60 | 636 | Finish: |
c3e94d89 | 637 | pm_notifier_call_chain(PM_POST_RESTORE); |
5a0a2f30 | 638 | pm_restore_console(); |
0709db60 | 639 | atomic_inc(&snapshot_device_available); |
dd5d666b | 640 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 641 | Unlock: |
a6d70980 | 642 | mutex_unlock(&pm_mutex); |
1da177e4 | 643 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 644 | return error; |
1da177e4 LT |
645 | } |
646 | ||
647 | late_initcall(software_resume); | |
648 | ||
649 | ||
a3d25c27 RW |
650 | static const char * const hibernation_modes[] = { |
651 | [HIBERNATION_PLATFORM] = "platform", | |
652 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
653 | [HIBERNATION_REBOOT] = "reboot", | |
654 | [HIBERNATION_TEST] = "test", | |
655 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
656 | }; |
657 | ||
658 | /** | |
a3d25c27 | 659 | * disk - Control hibernation mode |
1da177e4 | 660 | * |
11d77d0c JB |
661 | * Suspend-to-disk can be handled in several ways. We have a few options |
662 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
663 | * or other hibernation_ops), powering off the system or rebooting the |
664 | * system (for testing) as well as the two test modes. | |
1da177e4 | 665 | * |
11d77d0c | 666 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
667 | * encoded by the presence of hibernation_ops). However, the user may |
668 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
669 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
670 | * |
671 | * show() will display what the mode is currently set to. | |
672 | * store() will accept one of | |
673 | * | |
1da177e4 LT |
674 | * 'platform' |
675 | * 'shutdown' | |
676 | * 'reboot' | |
11d77d0c JB |
677 | * 'test' |
678 | * 'testproc' | |
1da177e4 | 679 | * |
11d77d0c | 680 | * It will only change to 'platform' if the system |
a3d25c27 | 681 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
682 | */ |
683 | ||
386f275f KS |
684 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
685 | char *buf) | |
1da177e4 | 686 | { |
f0ced9b2 JB |
687 | int i; |
688 | char *start = buf; | |
689 | ||
a3d25c27 RW |
690 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
691 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
692 | continue; |
693 | switch (i) { | |
a3d25c27 RW |
694 | case HIBERNATION_SHUTDOWN: |
695 | case HIBERNATION_REBOOT: | |
696 | case HIBERNATION_TEST: | |
697 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 698 | break; |
a3d25c27 RW |
699 | case HIBERNATION_PLATFORM: |
700 | if (hibernation_ops) | |
f0ced9b2 JB |
701 | break; |
702 | /* not a valid mode, continue with loop */ | |
703 | continue; | |
704 | } | |
a3d25c27 RW |
705 | if (i == hibernation_mode) |
706 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 707 | else |
a3d25c27 | 708 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
709 | } |
710 | buf += sprintf(buf, "\n"); | |
711 | return buf-start; | |
1da177e4 LT |
712 | } |
713 | ||
714 | ||
386f275f KS |
715 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
716 | const char *buf, size_t n) | |
1da177e4 LT |
717 | { |
718 | int error = 0; | |
719 | int i; | |
720 | int len; | |
721 | char *p; | |
a3d25c27 | 722 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
723 | |
724 | p = memchr(buf, '\n', n); | |
725 | len = p ? p - buf : n; | |
726 | ||
a6d70980 | 727 | mutex_lock(&pm_mutex); |
a3d25c27 | 728 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
729 | if (len == strlen(hibernation_modes[i]) |
730 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
731 | mode = i; |
732 | break; | |
733 | } | |
734 | } | |
a3d25c27 | 735 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 736 | switch (mode) { |
a3d25c27 RW |
737 | case HIBERNATION_SHUTDOWN: |
738 | case HIBERNATION_REBOOT: | |
739 | case HIBERNATION_TEST: | |
740 | case HIBERNATION_TESTPROC: | |
741 | hibernation_mode = mode; | |
fe0c935a | 742 | break; |
a3d25c27 RW |
743 | case HIBERNATION_PLATFORM: |
744 | if (hibernation_ops) | |
745 | hibernation_mode = mode; | |
1da177e4 LT |
746 | else |
747 | error = -EINVAL; | |
748 | } | |
a3d25c27 | 749 | } else |
1da177e4 LT |
750 | error = -EINVAL; |
751 | ||
a3d25c27 | 752 | if (!error) |
23976728 | 753 | pr_debug("PM: Hibernation mode set to '%s'\n", |
a3d25c27 | 754 | hibernation_modes[mode]); |
a6d70980 | 755 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
756 | return error ? error : n; |
757 | } | |
758 | ||
759 | power_attr(disk); | |
760 | ||
386f275f KS |
761 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
762 | char *buf) | |
1da177e4 LT |
763 | { |
764 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
765 | MINOR(swsusp_resume_device)); | |
766 | } | |
767 | ||
386f275f KS |
768 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
769 | const char *buf, size_t n) | |
1da177e4 | 770 | { |
1da177e4 | 771 | unsigned int maj, min; |
1da177e4 | 772 | dev_t res; |
a576219a | 773 | int ret = -EINVAL; |
1da177e4 | 774 | |
a576219a AM |
775 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
776 | goto out; | |
1da177e4 | 777 | |
a576219a AM |
778 | res = MKDEV(maj,min); |
779 | if (maj != MAJOR(res) || min != MINOR(res)) | |
780 | goto out; | |
1da177e4 | 781 | |
a6d70980 | 782 | mutex_lock(&pm_mutex); |
a576219a | 783 | swsusp_resume_device = res; |
a6d70980 | 784 | mutex_unlock(&pm_mutex); |
23976728 | 785 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
a576219a AM |
786 | noresume = 0; |
787 | software_resume(); | |
788 | ret = n; | |
59a49335 | 789 | out: |
a576219a | 790 | return ret; |
1da177e4 LT |
791 | } |
792 | ||
793 | power_attr(resume); | |
794 | ||
386f275f KS |
795 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
796 | char *buf) | |
ca0aec0f | 797 | { |
853609b6 | 798 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
799 | } |
800 | ||
386f275f KS |
801 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
802 | const char *buf, size_t n) | |
ca0aec0f | 803 | { |
853609b6 | 804 | unsigned long size; |
ca0aec0f | 805 | |
853609b6 | 806 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
807 | image_size = size; |
808 | return n; | |
809 | } | |
810 | ||
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | power_attr(image_size); | |
815 | ||
1da177e4 LT |
816 | static struct attribute * g[] = { |
817 | &disk_attr.attr, | |
818 | &resume_attr.attr, | |
ca0aec0f | 819 | &image_size_attr.attr, |
1da177e4 LT |
820 | NULL, |
821 | }; | |
822 | ||
823 | ||
824 | static struct attribute_group attr_group = { | |
825 | .attrs = g, | |
826 | }; | |
827 | ||
828 | ||
829 | static int __init pm_disk_init(void) | |
830 | { | |
d76e15fb | 831 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
832 | } |
833 | ||
834 | core_initcall(pm_disk_init); | |
835 | ||
836 | ||
837 | static int __init resume_setup(char *str) | |
838 | { | |
839 | if (noresume) | |
840 | return 1; | |
841 | ||
842 | strncpy( resume_file, str, 255 ); | |
843 | return 1; | |
844 | } | |
845 | ||
9a154d9d RW |
846 | static int __init resume_offset_setup(char *str) |
847 | { | |
848 | unsigned long long offset; | |
849 | ||
850 | if (noresume) | |
851 | return 1; | |
852 | ||
853 | if (sscanf(str, "%llu", &offset) == 1) | |
854 | swsusp_resume_block = offset; | |
855 | ||
856 | return 1; | |
857 | } | |
858 | ||
1da177e4 LT |
859 | static int __init noresume_setup(char *str) |
860 | { | |
861 | noresume = 1; | |
862 | return 1; | |
863 | } | |
864 | ||
865 | __setup("noresume", noresume_setup); | |
9a154d9d | 866 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 867 | __setup("resume=", resume_setup); |