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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 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 | ||
74f270af RW |
73 | /** |
74 | * platform_start - tell the platform driver that we're starting | |
75 | * hibernation | |
76 | */ | |
77 | ||
78 | static int platform_start(int platform_mode) | |
79 | { | |
80 | return (platform_mode && hibernation_ops) ? | |
81 | hibernation_ops->start() : 0; | |
82 | } | |
a3d25c27 | 83 | |
8a05aac2 | 84 | /** |
74f270af | 85 | * platform_pre_snapshot - prepare the machine for hibernation using the |
8a05aac2 SS |
86 | * platform driver if so configured and return an error code if it fails |
87 | */ | |
88 | ||
74f270af | 89 | static int platform_pre_snapshot(int platform_mode) |
8a05aac2 | 90 | { |
7777fab9 | 91 | return (platform_mode && hibernation_ops) ? |
74f270af | 92 | hibernation_ops->pre_snapshot() : 0; |
a3d25c27 | 93 | } |
8a05aac2 | 94 | |
a3d25c27 RW |
95 | /** |
96 | * platform_finish - switch the machine to the normal mode of operation | |
97 | * using the platform driver (must be called after platform_prepare()) | |
98 | */ | |
99 | ||
7777fab9 | 100 | static void platform_finish(int platform_mode) |
a3d25c27 | 101 | { |
7777fab9 | 102 | if (platform_mode && hibernation_ops) |
a3d25c27 | 103 | hibernation_ops->finish(); |
8a05aac2 SS |
104 | } |
105 | ||
a634cc10 RW |
106 | /** |
107 | * platform_pre_restore - prepare the platform for the restoration from a | |
108 | * hibernation image. If the restore fails after this function has been | |
109 | * called, platform_restore_cleanup() must be called. | |
110 | */ | |
111 | ||
112 | static int platform_pre_restore(int platform_mode) | |
113 | { | |
114 | return (platform_mode && hibernation_ops) ? | |
115 | hibernation_ops->pre_restore() : 0; | |
116 | } | |
117 | ||
118 | /** | |
119 | * platform_restore_cleanup - switch the platform to the normal mode of | |
120 | * operation after a failing restore. If platform_pre_restore() has been | |
121 | * called before the failing restore, this function must be called too, | |
122 | * regardless of the result of platform_pre_restore(). | |
123 | */ | |
124 | ||
125 | static void platform_restore_cleanup(int platform_mode) | |
126 | { | |
127 | if (platform_mode && hibernation_ops) | |
128 | hibernation_ops->restore_cleanup(); | |
129 | } | |
130 | ||
7777fab9 RW |
131 | /** |
132 | * hibernation_snapshot - quiesce devices and create the hibernation | |
133 | * snapshot image. | |
134 | * @platform_mode - if set, use the platform driver, if available, to | |
135 | * prepare the platform frimware for the power transition. | |
136 | * | |
137 | * Must be called with pm_mutex held | |
138 | */ | |
139 | ||
140 | int hibernation_snapshot(int platform_mode) | |
141 | { | |
142 | int error; | |
143 | ||
144 | /* Free memory before shutting down devices. */ | |
145 | error = swsusp_shrink_memory(); | |
146 | if (error) | |
10a1803d | 147 | return error; |
7777fab9 | 148 | |
74f270af RW |
149 | error = platform_start(platform_mode); |
150 | if (error) | |
151 | return error; | |
152 | ||
7777fab9 RW |
153 | suspend_console(); |
154 | error = device_suspend(PMSG_FREEZE); | |
10a1803d RW |
155 | if (error) |
156 | goto Resume_console; | |
157 | ||
74f270af | 158 | error = platform_pre_snapshot(platform_mode); |
7777fab9 RW |
159 | if (error) |
160 | goto Resume_devices; | |
161 | ||
162 | error = disable_nonboot_cpus(); | |
163 | if (!error) { | |
164 | if (hibernation_mode != HIBERNATION_TEST) { | |
165 | in_suspend = 1; | |
166 | error = swsusp_suspend(); | |
167 | /* Control returns here after successful restore */ | |
168 | } else { | |
169 | printk("swsusp debug: Waiting for 5 seconds.\n"); | |
170 | mdelay(5000); | |
171 | } | |
172 | } | |
173 | enable_nonboot_cpus(); | |
174 | Resume_devices: | |
175 | platform_finish(platform_mode); | |
176 | device_resume(); | |
10a1803d | 177 | Resume_console: |
7777fab9 | 178 | resume_console(); |
7777fab9 RW |
179 | return error; |
180 | } | |
181 | ||
182 | /** | |
183 | * hibernation_restore - quiesce devices and restore the hibernation | |
184 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
185 | * @platform_mode - if set, use the platform driver, if available, to |
186 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
187 | * |
188 | * Must be called with pm_mutex held | |
189 | */ | |
190 | ||
a634cc10 | 191 | int hibernation_restore(int platform_mode) |
7777fab9 RW |
192 | { |
193 | int error; | |
194 | ||
195 | pm_prepare_console(); | |
196 | suspend_console(); | |
197 | error = device_suspend(PMSG_PRETHAW); | |
198 | if (error) | |
199 | goto Finish; | |
200 | ||
a634cc10 RW |
201 | error = platform_pre_restore(platform_mode); |
202 | if (!error) { | |
203 | error = disable_nonboot_cpus(); | |
204 | if (!error) | |
205 | error = swsusp_resume(); | |
206 | enable_nonboot_cpus(); | |
207 | } | |
208 | platform_restore_cleanup(platform_mode); | |
7777fab9 | 209 | device_resume(); |
10a1803d | 210 | Finish: |
7777fab9 RW |
211 | resume_console(); |
212 | pm_restore_console(); | |
213 | return error; | |
214 | } | |
215 | ||
216 | /** | |
217 | * hibernation_platform_enter - enter the hibernation state using the | |
218 | * platform driver (if available) | |
219 | */ | |
220 | ||
221 | int hibernation_platform_enter(void) | |
222 | { | |
b1457bcc RW |
223 | int error; |
224 | ||
7777fab9 RW |
225 | if (hibernation_ops) { |
226 | kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); | |
b1457bcc RW |
227 | /* |
228 | * We have cancelled the power transition by running | |
229 | * hibernation_ops->finish() before saving the image, so we | |
230 | * should let the firmware know that we're going to enter the | |
231 | * sleep state after all | |
232 | */ | |
233 | error = hibernation_ops->prepare(); | |
58b3b71d | 234 | sysdev_shutdown(); |
b1457bcc RW |
235 | if (!error) |
236 | error = hibernation_ops->enter(); | |
7777fab9 | 237 | } else { |
b1457bcc | 238 | error = -ENOSYS; |
7777fab9 | 239 | } |
b1457bcc | 240 | return error; |
7777fab9 RW |
241 | } |
242 | ||
1da177e4 | 243 | /** |
a3d25c27 | 244 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 245 | * |
fe0c935a JB |
246 | * Use the platform driver, if configured so; otherwise try |
247 | * to power off or reboot. | |
1da177e4 LT |
248 | */ |
249 | ||
fe0c935a | 250 | static void power_down(void) |
1da177e4 | 251 | { |
a3d25c27 RW |
252 | switch (hibernation_mode) { |
253 | case HIBERNATION_TEST: | |
254 | case HIBERNATION_TESTPROC: | |
fe0c935a | 255 | break; |
a3d25c27 | 256 | case HIBERNATION_SHUTDOWN: |
fdde86ac | 257 | kernel_power_off(); |
1da177e4 | 258 | break; |
a3d25c27 | 259 | case HIBERNATION_REBOOT: |
fdde86ac | 260 | kernel_restart(NULL); |
1da177e4 | 261 | break; |
a3d25c27 | 262 | case HIBERNATION_PLATFORM: |
7777fab9 | 263 | hibernation_platform_enter(); |
1da177e4 | 264 | } |
fdde86ac | 265 | kernel_halt(); |
fe0c935a JB |
266 | /* |
267 | * Valid image is on the disk, if we continue we risk serious data | |
268 | * corruption after resume. | |
269 | */ | |
1da177e4 LT |
270 | printk(KERN_CRIT "Please power me down manually\n"); |
271 | while(1); | |
272 | } | |
273 | ||
ed746e3b RW |
274 | static void unprepare_processes(void) |
275 | { | |
276 | thaw_processes(); | |
277 | pm_restore_console(); | |
278 | } | |
279 | ||
1da177e4 LT |
280 | static int prepare_processes(void) |
281 | { | |
b918f6e6 | 282 | int error = 0; |
1da177e4 LT |
283 | |
284 | pm_prepare_console(); | |
1da177e4 LT |
285 | if (freeze_processes()) { |
286 | error = -EBUSY; | |
ed746e3b | 287 | unprepare_processes(); |
1da177e4 | 288 | } |
5a72e04d | 289 | return error; |
1da177e4 LT |
290 | } |
291 | ||
1da177e4 | 292 | /** |
a3d25c27 | 293 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
294 | */ |
295 | ||
a3d25c27 | 296 | int hibernate(void) |
1da177e4 LT |
297 | { |
298 | int error; | |
299 | ||
b10d9117 | 300 | mutex_lock(&pm_mutex); |
0709db60 | 301 | /* The snapshot device should not be opened while we're running */ |
b10d9117 RW |
302 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
303 | error = -EBUSY; | |
304 | goto Unlock; | |
305 | } | |
306 | ||
307 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); | |
308 | if (error) | |
309 | goto Exit; | |
0709db60 RW |
310 | |
311 | /* Allocate memory management structures */ | |
312 | error = create_basic_memory_bitmaps(); | |
313 | if (error) | |
314 | goto Exit; | |
315 | ||
232b1432 RW |
316 | printk("Syncing filesystems ... "); |
317 | sys_sync(); | |
318 | printk("done.\n"); | |
319 | ||
1da177e4 | 320 | error = prepare_processes(); |
5a72e04d | 321 | if (error) |
0709db60 | 322 | goto Finish; |
1da177e4 | 323 | |
a3d25c27 | 324 | if (hibernation_mode == HIBERNATION_TESTPROC) { |
ed746e3b RW |
325 | printk("swsusp debug: Waiting for 5 seconds.\n"); |
326 | mdelay(5000); | |
327 | goto Thaw; | |
328 | } | |
7777fab9 RW |
329 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
330 | if (in_suspend && !error) { | |
a634cc10 RW |
331 | unsigned int flags = 0; |
332 | ||
333 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
334 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 335 | pr_debug("PM: writing image.\n"); |
a634cc10 | 336 | error = swsusp_write(flags); |
7777fab9 | 337 | swsusp_free(); |
1da177e4 | 338 | if (!error) |
fe0c935a | 339 | power_down(); |
b918f6e6 | 340 | } else { |
1da177e4 | 341 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 342 | swsusp_free(); |
b918f6e6 | 343 | } |
b918f6e6 | 344 | Thaw: |
99dc7d63 | 345 | unprepare_processes(); |
0709db60 RW |
346 | Finish: |
347 | free_basic_memory_bitmaps(); | |
348 | Exit: | |
b10d9117 | 349 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
0709db60 | 350 | atomic_inc(&snapshot_device_available); |
b10d9117 RW |
351 | Unlock: |
352 | mutex_unlock(&pm_mutex); | |
1da177e4 LT |
353 | return error; |
354 | } | |
355 | ||
356 | ||
357 | /** | |
358 | * software_resume - Resume from a saved image. | |
359 | * | |
360 | * Called as a late_initcall (so all devices are discovered and | |
361 | * initialized), we call swsusp to see if we have a saved image or not. | |
362 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 363 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
364 | * Otherwise, we fail gracefully and return to the normally |
365 | * scheduled program. | |
366 | * | |
367 | */ | |
368 | ||
369 | static int software_resume(void) | |
370 | { | |
371 | int error; | |
a634cc10 | 372 | unsigned int flags; |
1da177e4 | 373 | |
a6d70980 | 374 | mutex_lock(&pm_mutex); |
3efa147a | 375 | if (!swsusp_resume_device) { |
dd5d666b | 376 | if (!strlen(resume_file)) { |
a6d70980 | 377 | mutex_unlock(&pm_mutex); |
3efa147a | 378 | return -ENOENT; |
dd5d666b | 379 | } |
3efa147a PM |
380 | swsusp_resume_device = name_to_dev_t(resume_file); |
381 | pr_debug("swsusp: Resume From Partition %s\n", resume_file); | |
382 | } else { | |
383 | pr_debug("swsusp: Resume From Partition %d:%d\n", | |
384 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | if (noresume) { |
388 | /** | |
389 | * FIXME: If noresume is specified, we need to find the partition | |
390 | * and reset it back to normal swap space. | |
391 | */ | |
a6d70980 | 392 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
393 | return 0; |
394 | } | |
395 | ||
396 | pr_debug("PM: Checking swsusp image.\n"); | |
ed746e3b RW |
397 | error = swsusp_check(); |
398 | if (error) | |
74dfd666 | 399 | goto Unlock; |
1da177e4 | 400 | |
0709db60 RW |
401 | /* The snapshot device should not be opened while we're running */ |
402 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
403 | error = -EBUSY; | |
404 | goto Unlock; | |
405 | } | |
406 | ||
74dfd666 RW |
407 | error = create_basic_memory_bitmaps(); |
408 | if (error) | |
0709db60 | 409 | goto Finish; |
1da177e4 | 410 | |
74dfd666 | 411 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
412 | error = prepare_processes(); |
413 | if (error) { | |
1da177e4 | 414 | swsusp_close(); |
5a72e04d | 415 | goto Done; |
1da177e4 LT |
416 | } |
417 | ||
418 | pr_debug("PM: Reading swsusp image.\n"); | |
419 | ||
a634cc10 | 420 | error = swsusp_read(&flags); |
ed746e3b | 421 | if (!error) |
a634cc10 | 422 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 423 | |
ed746e3b | 424 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 425 | swsusp_free(); |
1da177e4 LT |
426 | unprepare_processes(); |
427 | Done: | |
74dfd666 | 428 | free_basic_memory_bitmaps(); |
0709db60 RW |
429 | Finish: |
430 | atomic_inc(&snapshot_device_available); | |
dd5d666b | 431 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 432 | Unlock: |
a6d70980 | 433 | mutex_unlock(&pm_mutex); |
1da177e4 | 434 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 435 | return error; |
1da177e4 LT |
436 | } |
437 | ||
438 | late_initcall(software_resume); | |
439 | ||
440 | ||
a3d25c27 RW |
441 | static const char * const hibernation_modes[] = { |
442 | [HIBERNATION_PLATFORM] = "platform", | |
443 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
444 | [HIBERNATION_REBOOT] = "reboot", | |
445 | [HIBERNATION_TEST] = "test", | |
446 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
447 | }; |
448 | ||
449 | /** | |
a3d25c27 | 450 | * disk - Control hibernation mode |
1da177e4 | 451 | * |
11d77d0c JB |
452 | * Suspend-to-disk can be handled in several ways. We have a few options |
453 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
454 | * or other hibernation_ops), powering off the system or rebooting the |
455 | * system (for testing) as well as the two test modes. | |
1da177e4 | 456 | * |
11d77d0c | 457 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
458 | * encoded by the presence of hibernation_ops). However, the user may |
459 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
460 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
461 | * |
462 | * show() will display what the mode is currently set to. | |
463 | * store() will accept one of | |
464 | * | |
1da177e4 LT |
465 | * 'platform' |
466 | * 'shutdown' | |
467 | * 'reboot' | |
11d77d0c JB |
468 | * 'test' |
469 | * 'testproc' | |
1da177e4 | 470 | * |
11d77d0c | 471 | * It will only change to 'platform' if the system |
a3d25c27 | 472 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
473 | */ |
474 | ||
823bccfc | 475 | static ssize_t disk_show(struct kset *kset, char *buf) |
1da177e4 | 476 | { |
f0ced9b2 JB |
477 | int i; |
478 | char *start = buf; | |
479 | ||
a3d25c27 RW |
480 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
481 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
482 | continue; |
483 | switch (i) { | |
a3d25c27 RW |
484 | case HIBERNATION_SHUTDOWN: |
485 | case HIBERNATION_REBOOT: | |
486 | case HIBERNATION_TEST: | |
487 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 488 | break; |
a3d25c27 RW |
489 | case HIBERNATION_PLATFORM: |
490 | if (hibernation_ops) | |
f0ced9b2 JB |
491 | break; |
492 | /* not a valid mode, continue with loop */ | |
493 | continue; | |
494 | } | |
a3d25c27 RW |
495 | if (i == hibernation_mode) |
496 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 497 | else |
a3d25c27 | 498 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
499 | } |
500 | buf += sprintf(buf, "\n"); | |
501 | return buf-start; | |
1da177e4 LT |
502 | } |
503 | ||
504 | ||
823bccfc | 505 | static ssize_t disk_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 LT |
506 | { |
507 | int error = 0; | |
508 | int i; | |
509 | int len; | |
510 | char *p; | |
a3d25c27 | 511 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
512 | |
513 | p = memchr(buf, '\n', n); | |
514 | len = p ? p - buf : n; | |
515 | ||
a6d70980 | 516 | mutex_lock(&pm_mutex); |
a3d25c27 | 517 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
518 | if (len == strlen(hibernation_modes[i]) |
519 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
520 | mode = i; |
521 | break; | |
522 | } | |
523 | } | |
a3d25c27 | 524 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 525 | switch (mode) { |
a3d25c27 RW |
526 | case HIBERNATION_SHUTDOWN: |
527 | case HIBERNATION_REBOOT: | |
528 | case HIBERNATION_TEST: | |
529 | case HIBERNATION_TESTPROC: | |
530 | hibernation_mode = mode; | |
fe0c935a | 531 | break; |
a3d25c27 RW |
532 | case HIBERNATION_PLATFORM: |
533 | if (hibernation_ops) | |
534 | hibernation_mode = mode; | |
1da177e4 LT |
535 | else |
536 | error = -EINVAL; | |
537 | } | |
a3d25c27 | 538 | } else |
1da177e4 LT |
539 | error = -EINVAL; |
540 | ||
a3d25c27 RW |
541 | if (!error) |
542 | pr_debug("PM: suspend-to-disk mode set to '%s'\n", | |
543 | hibernation_modes[mode]); | |
a6d70980 | 544 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
545 | return error ? error : n; |
546 | } | |
547 | ||
548 | power_attr(disk); | |
549 | ||
823bccfc | 550 | static ssize_t resume_show(struct kset *kset, char *buf) |
1da177e4 LT |
551 | { |
552 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
553 | MINOR(swsusp_resume_device)); | |
554 | } | |
555 | ||
823bccfc | 556 | static ssize_t resume_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 | 557 | { |
1da177e4 | 558 | unsigned int maj, min; |
1da177e4 | 559 | dev_t res; |
a576219a | 560 | int ret = -EINVAL; |
1da177e4 | 561 | |
a576219a AM |
562 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
563 | goto out; | |
1da177e4 | 564 | |
a576219a AM |
565 | res = MKDEV(maj,min); |
566 | if (maj != MAJOR(res) || min != MINOR(res)) | |
567 | goto out; | |
1da177e4 | 568 | |
a6d70980 | 569 | mutex_lock(&pm_mutex); |
a576219a | 570 | swsusp_resume_device = res; |
a6d70980 | 571 | mutex_unlock(&pm_mutex); |
a576219a AM |
572 | printk("Attempting manual resume\n"); |
573 | noresume = 0; | |
574 | software_resume(); | |
575 | ret = n; | |
59a49335 | 576 | out: |
a576219a | 577 | return ret; |
1da177e4 LT |
578 | } |
579 | ||
580 | power_attr(resume); | |
581 | ||
823bccfc | 582 | static ssize_t image_size_show(struct kset *kset, char *buf) |
ca0aec0f | 583 | { |
853609b6 | 584 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
585 | } |
586 | ||
823bccfc | 587 | static ssize_t image_size_store(struct kset *kset, const char *buf, size_t n) |
ca0aec0f | 588 | { |
853609b6 | 589 | unsigned long size; |
ca0aec0f | 590 | |
853609b6 | 591 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
592 | image_size = size; |
593 | return n; | |
594 | } | |
595 | ||
596 | return -EINVAL; | |
597 | } | |
598 | ||
599 | power_attr(image_size); | |
600 | ||
1da177e4 LT |
601 | static struct attribute * g[] = { |
602 | &disk_attr.attr, | |
603 | &resume_attr.attr, | |
ca0aec0f | 604 | &image_size_attr.attr, |
1da177e4 LT |
605 | NULL, |
606 | }; | |
607 | ||
608 | ||
609 | static struct attribute_group attr_group = { | |
610 | .attrs = g, | |
611 | }; | |
612 | ||
613 | ||
614 | static int __init pm_disk_init(void) | |
615 | { | |
823bccfc | 616 | return sysfs_create_group(&power_subsys.kobj, &attr_group); |
1da177e4 LT |
617 | } |
618 | ||
619 | core_initcall(pm_disk_init); | |
620 | ||
621 | ||
622 | static int __init resume_setup(char *str) | |
623 | { | |
624 | if (noresume) | |
625 | return 1; | |
626 | ||
627 | strncpy( resume_file, str, 255 ); | |
628 | return 1; | |
629 | } | |
630 | ||
9a154d9d RW |
631 | static int __init resume_offset_setup(char *str) |
632 | { | |
633 | unsigned long long offset; | |
634 | ||
635 | if (noresume) | |
636 | return 1; | |
637 | ||
638 | if (sscanf(str, "%llu", &offset) == 1) | |
639 | swsusp_resume_block = offset; | |
640 | ||
641 | return 1; | |
642 | } | |
643 | ||
1da177e4 LT |
644 | static int __init noresume_setup(char *str) |
645 | { | |
646 | noresume = 1; | |
647 | return 1; | |
648 | } | |
649 | ||
650 | __setup("noresume", noresume_setup); | |
9a154d9d | 651 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 652 | __setup("resume=", resume_setup); |