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 LT |
28 | static int noresume = 0; |
29 | char resume_file[256] = CONFIG_PM_STD_PARTITION; | |
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 | { |
74f270af RW |
57 | if (ops && !(ops->start && ops->pre_snapshot && ops->finish |
58 | && ops->prepare && ops->enter && ops->pre_restore | |
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 RW |
102 | /** |
103 | * platform_start - tell the platform driver that we're starting | |
104 | * hibernation | |
105 | */ | |
106 | ||
107 | static int platform_start(int platform_mode) | |
108 | { | |
109 | return (platform_mode && hibernation_ops) ? | |
110 | hibernation_ops->start() : 0; | |
111 | } | |
a3d25c27 | 112 | |
8a05aac2 | 113 | /** |
74f270af | 114 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
115 | * platform driver if so configured and return an error code if it fails |
116 | */ | |
117 | ||
74f270af | 118 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 119 | { |
7777fab9 | 120 | return (platform_mode && hibernation_ops) ? |
74f270af | 121 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 122 | } |
8a05aac2 | 123 | |
c7e0831d RW |
124 | /** |
125 | * platform_leave - prepare the machine for switching to the normal mode | |
126 | * of operation using the platform driver (called with interrupts disabled) | |
127 | */ | |
128 | ||
129 | static void platform_leave(int platform_mode) | |
130 | { | |
131 | if (platform_mode && hibernation_ops) | |
132 | hibernation_ops->leave(); | |
133 | } | |
134 | ||
a3d25c27 RW |
135 | /** |
136 | * platform_finish - switch the machine to the normal mode of operation | |
137 | * using the platform driver (must be called after platform_prepare()) | |
138 | */ | |
139 | ||
7777fab9 | 140 | static void platform_finish(int platform_mode) |
a3d25c27 | 141 | { |
7777fab9 | 142 | if (platform_mode && hibernation_ops) |
a3d25c27 | 143 | hibernation_ops->finish(); |
8a05aac2 SS |
144 | } |
145 | ||
a634cc10 RW |
146 | /** |
147 | * platform_pre_restore - prepare the platform for the restoration from a | |
148 | * hibernation image. If the restore fails after this function has been | |
149 | * called, platform_restore_cleanup() must be called. | |
150 | */ | |
151 | ||
152 | static int platform_pre_restore(int platform_mode) | |
153 | { | |
154 | return (platform_mode && hibernation_ops) ? | |
155 | hibernation_ops->pre_restore() : 0; | |
156 | } | |
157 | ||
158 | /** | |
159 | * platform_restore_cleanup - switch the platform to the normal mode of | |
160 | * operation after a failing restore. If platform_pre_restore() has been | |
161 | * called before the failing restore, this function must be called too, | |
162 | * regardless of the result of platform_pre_restore(). | |
163 | */ | |
164 | ||
165 | static void platform_restore_cleanup(int platform_mode) | |
166 | { | |
167 | if (platform_mode && hibernation_ops) | |
168 | hibernation_ops->restore_cleanup(); | |
169 | } | |
170 | ||
c7e0831d RW |
171 | /** |
172 | * create_image - freeze devices that need to be frozen with interrupts | |
173 | * off, create the hibernation image and thaw those devices. Control | |
174 | * reappears in this routine after a restore. | |
175 | */ | |
176 | ||
177 | int create_image(int platform_mode) | |
178 | { | |
179 | int error; | |
180 | ||
181 | error = arch_prepare_suspend(); | |
182 | if (error) | |
183 | return error; | |
184 | ||
185 | local_irq_disable(); | |
186 | /* At this point, device_suspend() has been called, but *not* | |
187 | * device_power_down(). We *must* call device_power_down() now. | |
188 | * Otherwise, drivers for some devices (e.g. interrupt controllers) | |
189 | * become desynchronized with the actual state of the hardware | |
190 | * at resume time, and evil weirdness ensues. | |
191 | */ | |
192 | error = device_power_down(PMSG_FREEZE); | |
193 | if (error) { | |
194 | printk(KERN_ERR "Some devices failed to power down, " | |
195 | KERN_ERR "aborting suspend\n"); | |
196 | goto Enable_irqs; | |
197 | } | |
198 | ||
4cc79776 RW |
199 | if (hibernation_test(TEST_CORE)) |
200 | goto Power_up; | |
201 | ||
202 | in_suspend = 1; | |
c7e0831d RW |
203 | save_processor_state(); |
204 | error = swsusp_arch_suspend(); | |
205 | if (error) | |
206 | printk(KERN_ERR "Error %d while creating the image\n", error); | |
207 | /* Restore control flow magically appears here */ | |
208 | restore_processor_state(); | |
209 | if (!in_suspend) | |
210 | platform_leave(platform_mode); | |
4cc79776 | 211 | Power_up: |
c7e0831d RW |
212 | /* NOTE: device_power_up() is just a resume() for devices |
213 | * that suspended with irqs off ... no overall powerup. | |
214 | */ | |
215 | device_power_up(); | |
216 | Enable_irqs: | |
217 | local_irq_enable(); | |
218 | return error; | |
219 | } | |
220 | ||
7777fab9 RW |
221 | /** |
222 | * hibernation_snapshot - quiesce devices and create the hibernation | |
223 | * snapshot image. | |
224 | * @platform_mode - if set, use the platform driver, if available, to | |
225 | * prepare the platform frimware for the power transition. | |
226 | * | |
227 | * Must be called with pm_mutex held | |
228 | */ | |
229 | ||
230 | int hibernation_snapshot(int platform_mode) | |
231 | { | |
232 | int error; | |
233 | ||
234 | /* Free memory before shutting down devices. */ | |
235 | error = swsusp_shrink_memory(); | |
236 | if (error) | |
10a1803d | 237 | return error; |
7777fab9 | 238 | |
74f270af RW |
239 | error = platform_start(platform_mode); |
240 | if (error) | |
241 | return error; | |
242 | ||
7777fab9 RW |
243 | suspend_console(); |
244 | error = device_suspend(PMSG_FREEZE); | |
10a1803d RW |
245 | if (error) |
246 | goto Resume_console; | |
247 | ||
4cc79776 | 248 | if (hibernation_test(TEST_DEVICES)) |
7777fab9 RW |
249 | goto Resume_devices; |
250 | ||
4cc79776 RW |
251 | error = platform_pre_snapshot(platform_mode); |
252 | if (error || hibernation_test(TEST_PLATFORM)) | |
253 | goto Finish; | |
254 | ||
7777fab9 RW |
255 | error = disable_nonboot_cpus(); |
256 | if (!error) { | |
4cc79776 RW |
257 | if (hibernation_test(TEST_CPUS)) |
258 | goto Enable_cpus; | |
259 | ||
260 | if (hibernation_testmode(HIBERNATION_TEST)) | |
261 | goto Enable_cpus; | |
262 | ||
263 | error = create_image(platform_mode); | |
264 | /* Control returns here after successful restore */ | |
7777fab9 | 265 | } |
4cc79776 | 266 | Enable_cpus: |
7777fab9 | 267 | enable_nonboot_cpus(); |
4cc79776 | 268 | Finish: |
7777fab9 | 269 | platform_finish(platform_mode); |
4cc79776 | 270 | Resume_devices: |
7777fab9 | 271 | device_resume(); |
10a1803d | 272 | Resume_console: |
7777fab9 | 273 | resume_console(); |
7777fab9 RW |
274 | return error; |
275 | } | |
276 | ||
277 | /** | |
278 | * hibernation_restore - quiesce devices and restore the hibernation | |
279 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
280 | * @platform_mode - if set, use the platform driver, if available, to |
281 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
282 | * |
283 | * Must be called with pm_mutex held | |
284 | */ | |
285 | ||
a634cc10 | 286 | int hibernation_restore(int platform_mode) |
7777fab9 RW |
287 | { |
288 | int error; | |
289 | ||
290 | pm_prepare_console(); | |
291 | suspend_console(); | |
292 | error = device_suspend(PMSG_PRETHAW); | |
293 | if (error) | |
294 | goto Finish; | |
295 | ||
a634cc10 RW |
296 | error = platform_pre_restore(platform_mode); |
297 | if (!error) { | |
298 | error = disable_nonboot_cpus(); | |
299 | if (!error) | |
300 | error = swsusp_resume(); | |
301 | enable_nonboot_cpus(); | |
302 | } | |
303 | platform_restore_cleanup(platform_mode); | |
7777fab9 | 304 | device_resume(); |
10a1803d | 305 | Finish: |
7777fab9 RW |
306 | resume_console(); |
307 | pm_restore_console(); | |
308 | return error; | |
309 | } | |
310 | ||
311 | /** | |
312 | * hibernation_platform_enter - enter the hibernation state using the | |
313 | * platform driver (if available) | |
314 | */ | |
315 | ||
316 | int hibernation_platform_enter(void) | |
317 | { | |
b1457bcc RW |
318 | int error; |
319 | ||
9cd9a005 RW |
320 | if (!hibernation_ops) |
321 | return -ENOSYS; | |
322 | ||
323 | /* | |
324 | * We have cancelled the power transition by running | |
325 | * hibernation_ops->finish() before saving the image, so we should let | |
326 | * the firmware know that we're going to enter the sleep state after all | |
327 | */ | |
328 | error = hibernation_ops->start(); | |
329 | if (error) | |
330 | return error; | |
331 | ||
332 | suspend_console(); | |
333 | error = device_suspend(PMSG_SUSPEND); | |
334 | if (error) | |
335 | goto Resume_console; | |
336 | ||
337 | error = hibernation_ops->prepare(); | |
338 | if (error) | |
339 | goto Resume_devices; | |
340 | ||
341 | error = disable_nonboot_cpus(); | |
342 | if (error) | |
343 | goto Finish; | |
344 | ||
345 | local_irq_disable(); | |
346 | error = device_power_down(PMSG_SUSPEND); | |
347 | if (!error) { | |
348 | hibernation_ops->enter(); | |
349 | /* We should never get here */ | |
350 | while (1); | |
7777fab9 | 351 | } |
9cd9a005 RW |
352 | local_irq_enable(); |
353 | ||
354 | /* | |
355 | * We don't need to reenable the nonboot CPUs or resume consoles, since | |
356 | * the system is going to be halted anyway. | |
357 | */ | |
358 | Finish: | |
359 | hibernation_ops->finish(); | |
360 | Resume_devices: | |
361 | device_resume(); | |
362 | Resume_console: | |
363 | resume_console(); | |
b1457bcc | 364 | return error; |
7777fab9 RW |
365 | } |
366 | ||
1da177e4 | 367 | /** |
a3d25c27 | 368 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 369 | * |
fe0c935a JB |
370 | * Use the platform driver, if configured so; otherwise try |
371 | * to power off or reboot. | |
1da177e4 LT |
372 | */ |
373 | ||
fe0c935a | 374 | static void power_down(void) |
1da177e4 | 375 | { |
a3d25c27 RW |
376 | switch (hibernation_mode) { |
377 | case HIBERNATION_TEST: | |
378 | case HIBERNATION_TESTPROC: | |
fe0c935a | 379 | break; |
a3d25c27 | 380 | case HIBERNATION_REBOOT: |
fdde86ac | 381 | kernel_restart(NULL); |
1da177e4 | 382 | break; |
a3d25c27 | 383 | case HIBERNATION_PLATFORM: |
7777fab9 | 384 | hibernation_platform_enter(); |
9cd9a005 RW |
385 | case HIBERNATION_SHUTDOWN: |
386 | kernel_power_off(); | |
387 | break; | |
1da177e4 | 388 | } |
fdde86ac | 389 | kernel_halt(); |
fe0c935a JB |
390 | /* |
391 | * Valid image is on the disk, if we continue we risk serious data | |
392 | * corruption after resume. | |
393 | */ | |
1da177e4 LT |
394 | printk(KERN_CRIT "Please power me down manually\n"); |
395 | while(1); | |
396 | } | |
397 | ||
ed746e3b RW |
398 | static void unprepare_processes(void) |
399 | { | |
400 | thaw_processes(); | |
401 | pm_restore_console(); | |
402 | } | |
403 | ||
1da177e4 LT |
404 | static int prepare_processes(void) |
405 | { | |
b918f6e6 | 406 | int error = 0; |
1da177e4 LT |
407 | |
408 | pm_prepare_console(); | |
1da177e4 LT |
409 | if (freeze_processes()) { |
410 | error = -EBUSY; | |
ed746e3b | 411 | unprepare_processes(); |
1da177e4 | 412 | } |
5a72e04d | 413 | return error; |
1da177e4 LT |
414 | } |
415 | ||
1da177e4 | 416 | /** |
a3d25c27 | 417 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
418 | */ |
419 | ||
a3d25c27 | 420 | int hibernate(void) |
1da177e4 LT |
421 | { |
422 | int error; | |
423 | ||
b10d9117 | 424 | mutex_lock(&pm_mutex); |
0709db60 | 425 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
426 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
427 | error = -EBUSY; | |
428 | goto Unlock; | |
429 | } | |
430 | ||
431 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); | |
432 | if (error) | |
433 | goto Exit; | |
0709db60 RW |
434 | |
435 | /* Allocate memory management structures */ | |
436 | error = create_basic_memory_bitmaps(); | |
437 | if (error) | |
438 | goto Exit; | |
439 | ||
232b1432 RW |
440 | printk("Syncing filesystems ... "); |
441 | sys_sync(); | |
442 | printk("done.\n"); | |
443 | ||
1da177e4 | 444 | error = prepare_processes(); |
5a72e04d | 445 | if (error) |
0709db60 | 446 | goto Finish; |
1da177e4 | 447 | |
4cc79776 | 448 | if (hibernation_test(TEST_FREEZER)) |
ed746e3b | 449 | goto Thaw; |
4cc79776 RW |
450 | |
451 | if (hibernation_testmode(HIBERNATION_TESTPROC)) | |
452 | goto Thaw; | |
453 | ||
7777fab9 RW |
454 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
455 | if (in_suspend && !error) { | |
a634cc10 RW |
456 | unsigned int flags = 0; |
457 | ||
458 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
459 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 460 | pr_debug("PM: writing image.\n"); |
a634cc10 | 461 | error = swsusp_write(flags); |
7777fab9 | 462 | swsusp_free(); |
1da177e4 | 463 | if (!error) |
fe0c935a | 464 | power_down(); |
b918f6e6 | 465 | } else { |
1da177e4 | 466 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 467 | swsusp_free(); |
b918f6e6 | 468 | } |
b918f6e6 | 469 | Thaw: |
99dc7d63 | 470 | unprepare_processes(); |
0709db60 RW |
471 | Finish: |
472 | free_basic_memory_bitmaps(); | |
473 | Exit: | |
b10d9117 | 474 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
0709db60 | 475 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
476 | Unlock: |
477 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
478 | return error; |
479 | } | |
480 | ||
481 | ||
482 | /** | |
483 | * software_resume - Resume from a saved image. | |
484 | * | |
485 | * Called as a late_initcall (so all devices are discovered and | |
486 | * initialized), we call swsusp to see if we have a saved image or not. | |
487 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 488 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
489 | * Otherwise, we fail gracefully and return to the normally |
490 | * scheduled program. | |
491 | * | |
492 | */ | |
493 | ||
494 | static int software_resume(void) | |
495 | { | |
496 | int error; | |
a634cc10 | 497 | unsigned int flags; |
1da177e4 | 498 | |
60a0d233 JB |
499 | /* |
500 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs | |
501 | * is configured into the kernel. Since the regular hibernate | |
502 | * trigger path is via sysfs which takes a buffer mutex before | |
503 | * calling hibernate functions (which take pm_mutex) this can | |
504 | * cause lockdep to complain about a possible ABBA deadlock | |
505 | * which cannot happen since we're in the boot code here and | |
506 | * sysfs can't be invoked yet. Therefore, we use a subclass | |
507 | * here to avoid lockdep complaining. | |
508 | */ | |
509 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); | |
3efa147a | 510 | if (!swsusp_resume_device) { |
dd5d666b | 511 | if (!strlen(resume_file)) { |
a6d70980 | 512 | mutex_unlock(&pm_mutex); |
3efa147a | 513 | return -ENOENT; |
dd5d666b | 514 | } |
3efa147a PM |
515 | swsusp_resume_device = name_to_dev_t(resume_file); |
516 | pr_debug("swsusp: Resume From Partition %s\n", resume_file); | |
517 | } else { | |
518 | pr_debug("swsusp: Resume From Partition %d:%d\n", | |
519 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
520 | } | |
521 | ||
1da177e4 LT |
522 | if (noresume) { |
523 | /** | |
524 | * FIXME: If noresume is specified, we need to find the partition | |
525 | * and reset it back to normal swap space. | |
526 | */ | |
a6d70980 | 527 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
528 | return 0; |
529 | } | |
530 | ||
531 | pr_debug("PM: Checking swsusp image.\n"); | |
ed746e3b RW |
532 | error = swsusp_check(); |
533 | if (error) | |
74dfd666 | 534 | goto Unlock; |
1da177e4 | 535 | |
0709db60 RW |
536 | /* The snapshot device should not be opened while we're running */ |
537 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
538 | error = -EBUSY; | |
539 | goto Unlock; | |
540 | } | |
541 | ||
c3e94d89 AS |
542 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
543 | if (error) | |
544 | goto Finish; | |
545 | ||
74dfd666 RW |
546 | error = create_basic_memory_bitmaps(); |
547 | if (error) | |
0709db60 | 548 | goto Finish; |
1da177e4 | 549 | |
74dfd666 | 550 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
551 | error = prepare_processes(); |
552 | if (error) { | |
1da177e4 | 553 | swsusp_close(); |
5a72e04d | 554 | goto Done; |
1da177e4 LT |
555 | } |
556 | ||
557 | pr_debug("PM: Reading swsusp image.\n"); | |
558 | ||
a634cc10 | 559 | error = swsusp_read(&flags); |
ed746e3b | 560 | if (!error) |
a634cc10 | 561 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 562 | |
ed746e3b | 563 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 564 | swsusp_free(); |
1da177e4 LT |
565 | unprepare_processes(); |
566 | Done: | |
74dfd666 | 567 | free_basic_memory_bitmaps(); |
0709db60 | 568 | Finish: |
c3e94d89 | 569 | pm_notifier_call_chain(PM_POST_RESTORE); |
0709db60 | 570 | atomic_inc(&snapshot_device_available); |
dd5d666b | 571 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 572 | Unlock: |
a6d70980 | 573 | mutex_unlock(&pm_mutex); |
1da177e4 | 574 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 575 | return error; |
1da177e4 LT |
576 | } |
577 | ||
578 | late_initcall(software_resume); | |
579 | ||
580 | ||
a3d25c27 RW |
581 | static const char * const hibernation_modes[] = { |
582 | [HIBERNATION_PLATFORM] = "platform", | |
583 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
584 | [HIBERNATION_REBOOT] = "reboot", | |
585 | [HIBERNATION_TEST] = "test", | |
586 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
587 | }; |
588 | ||
589 | /** | |
a3d25c27 | 590 | * disk - Control hibernation mode |
1da177e4 | 591 | * |
11d77d0c JB |
592 | * Suspend-to-disk can be handled in several ways. We have a few options |
593 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
594 | * or other hibernation_ops), powering off the system or rebooting the |
595 | * system (for testing) as well as the two test modes. | |
1da177e4 | 596 | * |
11d77d0c | 597 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
598 | * encoded by the presence of hibernation_ops). However, the user may |
599 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
600 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
601 | * |
602 | * show() will display what the mode is currently set to. | |
603 | * store() will accept one of | |
604 | * | |
1da177e4 LT |
605 | * 'platform' |
606 | * 'shutdown' | |
607 | * 'reboot' | |
11d77d0c JB |
608 | * 'test' |
609 | * 'testproc' | |
1da177e4 | 610 | * |
11d77d0c | 611 | * It will only change to 'platform' if the system |
a3d25c27 | 612 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
613 | */ |
614 | ||
386f275f KS |
615 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
616 | char *buf) | |
1da177e4 | 617 | { |
f0ced9b2 JB |
618 | int i; |
619 | char *start = buf; | |
620 | ||
a3d25c27 RW |
621 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
622 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
623 | continue; |
624 | switch (i) { | |
a3d25c27 RW |
625 | case HIBERNATION_SHUTDOWN: |
626 | case HIBERNATION_REBOOT: | |
627 | case HIBERNATION_TEST: | |
628 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 629 | break; |
a3d25c27 RW |
630 | case HIBERNATION_PLATFORM: |
631 | if (hibernation_ops) | |
f0ced9b2 JB |
632 | break; |
633 | /* not a valid mode, continue with loop */ | |
634 | continue; | |
635 | } | |
a3d25c27 RW |
636 | if (i == hibernation_mode) |
637 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 638 | else |
a3d25c27 | 639 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
640 | } |
641 | buf += sprintf(buf, "\n"); | |
642 | return buf-start; | |
1da177e4 LT |
643 | } |
644 | ||
645 | ||
386f275f KS |
646 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
647 | const char *buf, size_t n) | |
1da177e4 LT |
648 | { |
649 | int error = 0; | |
650 | int i; | |
651 | int len; | |
652 | char *p; | |
a3d25c27 | 653 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
654 | |
655 | p = memchr(buf, '\n', n); | |
656 | len = p ? p - buf : n; | |
657 | ||
a6d70980 | 658 | mutex_lock(&pm_mutex); |
a3d25c27 | 659 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
660 | if (len == strlen(hibernation_modes[i]) |
661 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
662 | mode = i; |
663 | break; | |
664 | } | |
665 | } | |
a3d25c27 | 666 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 667 | switch (mode) { |
a3d25c27 RW |
668 | case HIBERNATION_SHUTDOWN: |
669 | case HIBERNATION_REBOOT: | |
670 | case HIBERNATION_TEST: | |
671 | case HIBERNATION_TESTPROC: | |
672 | hibernation_mode = mode; | |
fe0c935a | 673 | break; |
a3d25c27 RW |
674 | case HIBERNATION_PLATFORM: |
675 | if (hibernation_ops) | |
676 | hibernation_mode = mode; | |
1da177e4 LT |
677 | else |
678 | error = -EINVAL; | |
679 | } | |
a3d25c27 | 680 | } else |
1da177e4 LT |
681 | error = -EINVAL; |
682 | ||
a3d25c27 RW |
683 | if (!error) |
684 | pr_debug("PM: suspend-to-disk mode set to '%s'\n", | |
685 | hibernation_modes[mode]); | |
a6d70980 | 686 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
687 | return error ? error : n; |
688 | } | |
689 | ||
690 | power_attr(disk); | |
691 | ||
386f275f KS |
692 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
693 | char *buf) | |
1da177e4 LT |
694 | { |
695 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
696 | MINOR(swsusp_resume_device)); | |
697 | } | |
698 | ||
386f275f KS |
699 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
700 | const char *buf, size_t n) | |
1da177e4 | 701 | { |
1da177e4 | 702 | unsigned int maj, min; |
1da177e4 | 703 | dev_t res; |
a576219a | 704 | int ret = -EINVAL; |
1da177e4 | 705 | |
a576219a AM |
706 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
707 | goto out; | |
1da177e4 | 708 | |
a576219a AM |
709 | res = MKDEV(maj,min); |
710 | if (maj != MAJOR(res) || min != MINOR(res)) | |
711 | goto out; | |
1da177e4 | 712 | |
a6d70980 | 713 | mutex_lock(&pm_mutex); |
a576219a | 714 | swsusp_resume_device = res; |
a6d70980 | 715 | mutex_unlock(&pm_mutex); |
a576219a AM |
716 | printk("Attempting manual resume\n"); |
717 | noresume = 0; | |
718 | software_resume(); | |
719 | ret = n; | |
59a49335 | 720 | out: |
a576219a | 721 | return ret; |
1da177e4 LT |
722 | } |
723 | ||
724 | power_attr(resume); | |
725 | ||
386f275f KS |
726 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
727 | char *buf) | |
ca0aec0f | 728 | { |
853609b6 | 729 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
730 | } |
731 | ||
386f275f KS |
732 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
733 | const char *buf, size_t n) | |
ca0aec0f | 734 | { |
853609b6 | 735 | unsigned long size; |
ca0aec0f | 736 | |
853609b6 | 737 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
738 | image_size = size; |
739 | return n; | |
740 | } | |
741 | ||
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | power_attr(image_size); | |
746 | ||
1da177e4 LT |
747 | static struct attribute * g[] = { |
748 | &disk_attr.attr, | |
749 | &resume_attr.attr, | |
ca0aec0f | 750 | &image_size_attr.attr, |
1da177e4 LT |
751 | NULL, |
752 | }; | |
753 | ||
754 | ||
755 | static struct attribute_group attr_group = { | |
756 | .attrs = g, | |
757 | }; | |
758 | ||
759 | ||
760 | static int __init pm_disk_init(void) | |
761 | { | |
d76e15fb | 762 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
763 | } |
764 | ||
765 | core_initcall(pm_disk_init); | |
766 | ||
767 | ||
768 | static int __init resume_setup(char *str) | |
769 | { | |
770 | if (noresume) | |
771 | return 1; | |
772 | ||
773 | strncpy( resume_file, str, 255 ); | |
774 | return 1; | |
775 | } | |
776 | ||
9a154d9d RW |
777 | static int __init resume_offset_setup(char *str) |
778 | { | |
779 | unsigned long long offset; | |
780 | ||
781 | if (noresume) | |
782 | return 1; | |
783 | ||
784 | if (sscanf(str, "%llu", &offset) == 1) | |
785 | swsusp_resume_block = offset; | |
786 | ||
787 | return 1; | |
788 | } | |
789 | ||
1da177e4 LT |
790 | static int __init noresume_setup(char *str) |
791 | { | |
792 | noresume = 1; | |
793 | return 1; | |
794 | } | |
795 | ||
796 | __setup("noresume", noresume_setup); | |
9a154d9d | 797 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 798 | __setup("resume=", resume_setup); |