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> | |
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 | ||
7777fab9 | 48 | static struct 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 | ||
55 | void hibernation_set_ops(struct hibernation_ops *ops) | |
56 | { | |
a634cc10 RW |
57 | if (ops && !(ops->prepare && ops->enter && ops->finish |
58 | && ops->pre_restore && ops->restore_cleanup)) { | |
a3d25c27 RW |
59 | WARN_ON(1); |
60 | return; | |
61 | } | |
62 | mutex_lock(&pm_mutex); | |
63 | hibernation_ops = ops; | |
64 | if (ops) | |
65 | hibernation_mode = HIBERNATION_PLATFORM; | |
66 | else if (hibernation_mode == HIBERNATION_PLATFORM) | |
67 | hibernation_mode = HIBERNATION_SHUTDOWN; | |
68 | ||
69 | mutex_unlock(&pm_mutex); | |
70 | } | |
71 | ||
72 | ||
8a05aac2 SS |
73 | /** |
74 | * platform_prepare - prepare the machine for hibernation using the | |
75 | * platform driver if so configured and return an error code if it fails | |
76 | */ | |
77 | ||
7777fab9 | 78 | static int platform_prepare(int platform_mode) |
8a05aac2 | 79 | { |
7777fab9 | 80 | return (platform_mode && hibernation_ops) ? |
a3d25c27 RW |
81 | hibernation_ops->prepare() : 0; |
82 | } | |
8a05aac2 | 83 | |
a3d25c27 RW |
84 | /** |
85 | * platform_finish - switch the machine to the normal mode of operation | |
86 | * using the platform driver (must be called after platform_prepare()) | |
87 | */ | |
88 | ||
7777fab9 | 89 | static void platform_finish(int platform_mode) |
a3d25c27 | 90 | { |
7777fab9 | 91 | if (platform_mode && hibernation_ops) |
a3d25c27 | 92 | hibernation_ops->finish(); |
8a05aac2 SS |
93 | } |
94 | ||
a634cc10 RW |
95 | /** |
96 | * platform_pre_restore - prepare the platform for the restoration from a | |
97 | * hibernation image. If the restore fails after this function has been | |
98 | * called, platform_restore_cleanup() must be called. | |
99 | */ | |
100 | ||
101 | static int platform_pre_restore(int platform_mode) | |
102 | { | |
103 | return (platform_mode && hibernation_ops) ? | |
104 | hibernation_ops->pre_restore() : 0; | |
105 | } | |
106 | ||
107 | /** | |
108 | * platform_restore_cleanup - switch the platform to the normal mode of | |
109 | * operation after a failing restore. If platform_pre_restore() has been | |
110 | * called before the failing restore, this function must be called too, | |
111 | * regardless of the result of platform_pre_restore(). | |
112 | */ | |
113 | ||
114 | static void platform_restore_cleanup(int platform_mode) | |
115 | { | |
116 | if (platform_mode && hibernation_ops) | |
117 | hibernation_ops->restore_cleanup(); | |
118 | } | |
119 | ||
7777fab9 RW |
120 | /** |
121 | * hibernation_snapshot - quiesce devices and create the hibernation | |
122 | * snapshot image. | |
123 | * @platform_mode - if set, use the platform driver, if available, to | |
124 | * prepare the platform frimware for the power transition. | |
125 | * | |
126 | * Must be called with pm_mutex held | |
127 | */ | |
128 | ||
129 | int hibernation_snapshot(int platform_mode) | |
130 | { | |
131 | int error; | |
132 | ||
133 | /* Free memory before shutting down devices. */ | |
134 | error = swsusp_shrink_memory(); | |
135 | if (error) | |
10a1803d | 136 | return error; |
7777fab9 RW |
137 | |
138 | suspend_console(); | |
139 | error = device_suspend(PMSG_FREEZE); | |
10a1803d RW |
140 | if (error) |
141 | goto Resume_console; | |
142 | ||
143 | error = platform_prepare(platform_mode); | |
7777fab9 RW |
144 | if (error) |
145 | goto Resume_devices; | |
146 | ||
147 | error = disable_nonboot_cpus(); | |
148 | if (!error) { | |
149 | if (hibernation_mode != HIBERNATION_TEST) { | |
150 | in_suspend = 1; | |
151 | error = swsusp_suspend(); | |
152 | /* Control returns here after successful restore */ | |
153 | } else { | |
154 | printk("swsusp debug: Waiting for 5 seconds.\n"); | |
155 | mdelay(5000); | |
156 | } | |
157 | } | |
158 | enable_nonboot_cpus(); | |
159 | Resume_devices: | |
160 | platform_finish(platform_mode); | |
161 | device_resume(); | |
10a1803d | 162 | Resume_console: |
7777fab9 | 163 | resume_console(); |
7777fab9 RW |
164 | return error; |
165 | } | |
166 | ||
167 | /** | |
168 | * hibernation_restore - quiesce devices and restore the hibernation | |
169 | * snapshot image. If successful, control returns in hibernation_snaphot() | |
a634cc10 RW |
170 | * @platform_mode - if set, use the platform driver, if available, to |
171 | * prepare the platform frimware for the transition. | |
7777fab9 RW |
172 | * |
173 | * Must be called with pm_mutex held | |
174 | */ | |
175 | ||
a634cc10 | 176 | int hibernation_restore(int platform_mode) |
7777fab9 RW |
177 | { |
178 | int error; | |
179 | ||
180 | pm_prepare_console(); | |
181 | suspend_console(); | |
182 | error = device_suspend(PMSG_PRETHAW); | |
183 | if (error) | |
184 | goto Finish; | |
185 | ||
a634cc10 RW |
186 | error = platform_pre_restore(platform_mode); |
187 | if (!error) { | |
188 | error = disable_nonboot_cpus(); | |
189 | if (!error) | |
190 | error = swsusp_resume(); | |
191 | enable_nonboot_cpus(); | |
192 | } | |
193 | platform_restore_cleanup(platform_mode); | |
7777fab9 | 194 | device_resume(); |
10a1803d | 195 | Finish: |
7777fab9 RW |
196 | resume_console(); |
197 | pm_restore_console(); | |
198 | return error; | |
199 | } | |
200 | ||
201 | /** | |
202 | * hibernation_platform_enter - enter the hibernation state using the | |
203 | * platform driver (if available) | |
204 | */ | |
205 | ||
206 | int hibernation_platform_enter(void) | |
207 | { | |
208 | if (hibernation_ops) { | |
209 | kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); | |
210 | return hibernation_ops->enter(); | |
211 | } else { | |
212 | return -ENOSYS; | |
213 | } | |
214 | } | |
215 | ||
1da177e4 | 216 | /** |
a3d25c27 | 217 | * power_down - Shut the machine down for hibernation. |
1da177e4 | 218 | * |
fe0c935a JB |
219 | * Use the platform driver, if configured so; otherwise try |
220 | * to power off or reboot. | |
1da177e4 LT |
221 | */ |
222 | ||
fe0c935a | 223 | static void power_down(void) |
1da177e4 | 224 | { |
a3d25c27 RW |
225 | switch (hibernation_mode) { |
226 | case HIBERNATION_TEST: | |
227 | case HIBERNATION_TESTPROC: | |
fe0c935a | 228 | break; |
a3d25c27 | 229 | case HIBERNATION_SHUTDOWN: |
fdde86ac | 230 | kernel_power_off(); |
1da177e4 | 231 | break; |
a3d25c27 | 232 | case HIBERNATION_REBOOT: |
fdde86ac | 233 | kernel_restart(NULL); |
1da177e4 | 234 | break; |
a3d25c27 | 235 | case HIBERNATION_PLATFORM: |
7777fab9 | 236 | hibernation_platform_enter(); |
1da177e4 | 237 | } |
fdde86ac | 238 | kernel_halt(); |
fe0c935a JB |
239 | /* |
240 | * Valid image is on the disk, if we continue we risk serious data | |
241 | * corruption after resume. | |
242 | */ | |
1da177e4 LT |
243 | printk(KERN_CRIT "Please power me down manually\n"); |
244 | while(1); | |
245 | } | |
246 | ||
ed746e3b RW |
247 | static void unprepare_processes(void) |
248 | { | |
249 | thaw_processes(); | |
250 | pm_restore_console(); | |
251 | } | |
252 | ||
1da177e4 LT |
253 | static int prepare_processes(void) |
254 | { | |
b918f6e6 | 255 | int error = 0; |
1da177e4 LT |
256 | |
257 | pm_prepare_console(); | |
1da177e4 LT |
258 | if (freeze_processes()) { |
259 | error = -EBUSY; | |
ed746e3b | 260 | unprepare_processes(); |
1da177e4 | 261 | } |
5a72e04d | 262 | return error; |
1da177e4 LT |
263 | } |
264 | ||
1da177e4 | 265 | /** |
a3d25c27 | 266 | * hibernate - The granpappy of the built-in hibernation management |
1da177e4 LT |
267 | */ |
268 | ||
a3d25c27 | 269 | int hibernate(void) |
1da177e4 LT |
270 | { |
271 | int error; | |
272 | ||
0709db60 RW |
273 | /* The snapshot device should not be opened while we're running */ |
274 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) | |
275 | return -EBUSY; | |
276 | ||
277 | /* Allocate memory management structures */ | |
278 | error = create_basic_memory_bitmaps(); | |
279 | if (error) | |
280 | goto Exit; | |
281 | ||
1da177e4 | 282 | error = prepare_processes(); |
5a72e04d | 283 | if (error) |
0709db60 | 284 | goto Finish; |
1da177e4 | 285 | |
a3d25c27 RW |
286 | mutex_lock(&pm_mutex); |
287 | if (hibernation_mode == HIBERNATION_TESTPROC) { | |
ed746e3b RW |
288 | printk("swsusp debug: Waiting for 5 seconds.\n"); |
289 | mdelay(5000); | |
290 | goto Thaw; | |
291 | } | |
7777fab9 RW |
292 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
293 | if (in_suspend && !error) { | |
a634cc10 RW |
294 | unsigned int flags = 0; |
295 | ||
296 | if (hibernation_mode == HIBERNATION_PLATFORM) | |
297 | flags |= SF_PLATFORM_MODE; | |
1da177e4 | 298 | pr_debug("PM: writing image.\n"); |
a634cc10 | 299 | error = swsusp_write(flags); |
7777fab9 | 300 | swsusp_free(); |
1da177e4 | 301 | if (!error) |
fe0c935a | 302 | power_down(); |
b918f6e6 | 303 | } else { |
1da177e4 | 304 | pr_debug("PM: Image restored successfully.\n"); |
7777fab9 | 305 | swsusp_free(); |
b918f6e6 | 306 | } |
b918f6e6 | 307 | Thaw: |
a3d25c27 | 308 | mutex_unlock(&pm_mutex); |
99dc7d63 | 309 | unprepare_processes(); |
0709db60 RW |
310 | Finish: |
311 | free_basic_memory_bitmaps(); | |
312 | Exit: | |
313 | atomic_inc(&snapshot_device_available); | |
1da177e4 LT |
314 | return error; |
315 | } | |
316 | ||
317 | ||
318 | /** | |
319 | * software_resume - Resume from a saved image. | |
320 | * | |
321 | * Called as a late_initcall (so all devices are discovered and | |
322 | * initialized), we call swsusp to see if we have a saved image or not. | |
323 | * If so, we quiesce devices, the restore the saved image. We will | |
a3d25c27 | 324 | * return above (in hibernate() ) if everything goes well. |
1da177e4 LT |
325 | * Otherwise, we fail gracefully and return to the normally |
326 | * scheduled program. | |
327 | * | |
328 | */ | |
329 | ||
330 | static int software_resume(void) | |
331 | { | |
332 | int error; | |
a634cc10 | 333 | unsigned int flags; |
1da177e4 | 334 | |
a6d70980 | 335 | mutex_lock(&pm_mutex); |
3efa147a | 336 | if (!swsusp_resume_device) { |
dd5d666b | 337 | if (!strlen(resume_file)) { |
a6d70980 | 338 | mutex_unlock(&pm_mutex); |
3efa147a | 339 | return -ENOENT; |
dd5d666b | 340 | } |
3efa147a PM |
341 | swsusp_resume_device = name_to_dev_t(resume_file); |
342 | pr_debug("swsusp: Resume From Partition %s\n", resume_file); | |
343 | } else { | |
344 | pr_debug("swsusp: Resume From Partition %d:%d\n", | |
345 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
346 | } | |
347 | ||
1da177e4 LT |
348 | if (noresume) { |
349 | /** | |
350 | * FIXME: If noresume is specified, we need to find the partition | |
351 | * and reset it back to normal swap space. | |
352 | */ | |
a6d70980 | 353 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
354 | return 0; |
355 | } | |
356 | ||
357 | pr_debug("PM: Checking swsusp image.\n"); | |
ed746e3b RW |
358 | error = swsusp_check(); |
359 | if (error) | |
74dfd666 | 360 | goto Unlock; |
1da177e4 | 361 | |
0709db60 RW |
362 | /* The snapshot device should not be opened while we're running */ |
363 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { | |
364 | error = -EBUSY; | |
365 | goto Unlock; | |
366 | } | |
367 | ||
74dfd666 RW |
368 | error = create_basic_memory_bitmaps(); |
369 | if (error) | |
0709db60 | 370 | goto Finish; |
1da177e4 | 371 | |
74dfd666 | 372 | pr_debug("PM: Preparing processes for restore.\n"); |
ed746e3b RW |
373 | error = prepare_processes(); |
374 | if (error) { | |
1da177e4 | 375 | swsusp_close(); |
5a72e04d | 376 | goto Done; |
1da177e4 LT |
377 | } |
378 | ||
379 | pr_debug("PM: Reading swsusp image.\n"); | |
380 | ||
a634cc10 | 381 | error = swsusp_read(&flags); |
ed746e3b | 382 | if (!error) |
a634cc10 | 383 | hibernation_restore(flags & SF_PLATFORM_MODE); |
1da177e4 | 384 | |
ed746e3b | 385 | printk(KERN_ERR "PM: Restore failed, recovering.\n"); |
7777fab9 | 386 | swsusp_free(); |
1da177e4 LT |
387 | unprepare_processes(); |
388 | Done: | |
74dfd666 | 389 | free_basic_memory_bitmaps(); |
0709db60 RW |
390 | Finish: |
391 | atomic_inc(&snapshot_device_available); | |
dd5d666b | 392 | /* For success case, the suspend path will release the lock */ |
74dfd666 | 393 | Unlock: |
a6d70980 | 394 | mutex_unlock(&pm_mutex); |
1da177e4 | 395 | pr_debug("PM: Resume from disk failed.\n"); |
7777fab9 | 396 | return error; |
1da177e4 LT |
397 | } |
398 | ||
399 | late_initcall(software_resume); | |
400 | ||
401 | ||
a3d25c27 RW |
402 | static const char * const hibernation_modes[] = { |
403 | [HIBERNATION_PLATFORM] = "platform", | |
404 | [HIBERNATION_SHUTDOWN] = "shutdown", | |
405 | [HIBERNATION_REBOOT] = "reboot", | |
406 | [HIBERNATION_TEST] = "test", | |
407 | [HIBERNATION_TESTPROC] = "testproc", | |
1da177e4 LT |
408 | }; |
409 | ||
410 | /** | |
a3d25c27 | 411 | * disk - Control hibernation mode |
1da177e4 | 412 | * |
11d77d0c JB |
413 | * Suspend-to-disk can be handled in several ways. We have a few options |
414 | * for putting the system to sleep - using the platform driver (e.g. ACPI | |
a3d25c27 RW |
415 | * or other hibernation_ops), powering off the system or rebooting the |
416 | * system (for testing) as well as the two test modes. | |
1da177e4 | 417 | * |
11d77d0c | 418 | * The system can support 'platform', and that is known a priori (and |
a3d25c27 RW |
419 | * encoded by the presence of hibernation_ops). However, the user may |
420 | * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the | |
421 | * test modes, 'test' or 'testproc'. | |
1da177e4 LT |
422 | * |
423 | * show() will display what the mode is currently set to. | |
424 | * store() will accept one of | |
425 | * | |
1da177e4 LT |
426 | * 'platform' |
427 | * 'shutdown' | |
428 | * 'reboot' | |
11d77d0c JB |
429 | * 'test' |
430 | * 'testproc' | |
1da177e4 | 431 | * |
11d77d0c | 432 | * It will only change to 'platform' if the system |
a3d25c27 | 433 | * supports it (as determined by having hibernation_ops). |
1da177e4 LT |
434 | */ |
435 | ||
823bccfc | 436 | static ssize_t disk_show(struct kset *kset, char *buf) |
1da177e4 | 437 | { |
f0ced9b2 JB |
438 | int i; |
439 | char *start = buf; | |
440 | ||
a3d25c27 RW |
441 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
442 | if (!hibernation_modes[i]) | |
f0ced9b2 JB |
443 | continue; |
444 | switch (i) { | |
a3d25c27 RW |
445 | case HIBERNATION_SHUTDOWN: |
446 | case HIBERNATION_REBOOT: | |
447 | case HIBERNATION_TEST: | |
448 | case HIBERNATION_TESTPROC: | |
f0ced9b2 | 449 | break; |
a3d25c27 RW |
450 | case HIBERNATION_PLATFORM: |
451 | if (hibernation_ops) | |
f0ced9b2 JB |
452 | break; |
453 | /* not a valid mode, continue with loop */ | |
454 | continue; | |
455 | } | |
a3d25c27 RW |
456 | if (i == hibernation_mode) |
457 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); | |
f0ced9b2 | 458 | else |
a3d25c27 | 459 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
f0ced9b2 JB |
460 | } |
461 | buf += sprintf(buf, "\n"); | |
462 | return buf-start; | |
1da177e4 LT |
463 | } |
464 | ||
465 | ||
823bccfc | 466 | static ssize_t disk_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 LT |
467 | { |
468 | int error = 0; | |
469 | int i; | |
470 | int len; | |
471 | char *p; | |
a3d25c27 | 472 | int mode = HIBERNATION_INVALID; |
1da177e4 LT |
473 | |
474 | p = memchr(buf, '\n', n); | |
475 | len = p ? p - buf : n; | |
476 | ||
a6d70980 | 477 | mutex_lock(&pm_mutex); |
a3d25c27 | 478 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
8d98a690 RW |
479 | if (len == strlen(hibernation_modes[i]) |
480 | && !strncmp(buf, hibernation_modes[i], len)) { | |
1da177e4 LT |
481 | mode = i; |
482 | break; | |
483 | } | |
484 | } | |
a3d25c27 | 485 | if (mode != HIBERNATION_INVALID) { |
fe0c935a | 486 | switch (mode) { |
a3d25c27 RW |
487 | case HIBERNATION_SHUTDOWN: |
488 | case HIBERNATION_REBOOT: | |
489 | case HIBERNATION_TEST: | |
490 | case HIBERNATION_TESTPROC: | |
491 | hibernation_mode = mode; | |
fe0c935a | 492 | break; |
a3d25c27 RW |
493 | case HIBERNATION_PLATFORM: |
494 | if (hibernation_ops) | |
495 | hibernation_mode = mode; | |
1da177e4 LT |
496 | else |
497 | error = -EINVAL; | |
498 | } | |
a3d25c27 | 499 | } else |
1da177e4 LT |
500 | error = -EINVAL; |
501 | ||
a3d25c27 RW |
502 | if (!error) |
503 | pr_debug("PM: suspend-to-disk mode set to '%s'\n", | |
504 | hibernation_modes[mode]); | |
a6d70980 | 505 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
506 | return error ? error : n; |
507 | } | |
508 | ||
509 | power_attr(disk); | |
510 | ||
823bccfc | 511 | static ssize_t resume_show(struct kset *kset, char *buf) |
1da177e4 LT |
512 | { |
513 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
514 | MINOR(swsusp_resume_device)); | |
515 | } | |
516 | ||
823bccfc | 517 | static ssize_t resume_store(struct kset *kset, const char *buf, size_t n) |
1da177e4 | 518 | { |
1da177e4 | 519 | unsigned int maj, min; |
1da177e4 | 520 | dev_t res; |
a576219a | 521 | int ret = -EINVAL; |
1da177e4 | 522 | |
a576219a AM |
523 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
524 | goto out; | |
1da177e4 | 525 | |
a576219a AM |
526 | res = MKDEV(maj,min); |
527 | if (maj != MAJOR(res) || min != MINOR(res)) | |
528 | goto out; | |
1da177e4 | 529 | |
a6d70980 | 530 | mutex_lock(&pm_mutex); |
a576219a | 531 | swsusp_resume_device = res; |
a6d70980 | 532 | mutex_unlock(&pm_mutex); |
a576219a AM |
533 | printk("Attempting manual resume\n"); |
534 | noresume = 0; | |
535 | software_resume(); | |
536 | ret = n; | |
59a49335 | 537 | out: |
a576219a | 538 | return ret; |
1da177e4 LT |
539 | } |
540 | ||
541 | power_attr(resume); | |
542 | ||
823bccfc | 543 | static ssize_t image_size_show(struct kset *kset, char *buf) |
ca0aec0f | 544 | { |
853609b6 | 545 | return sprintf(buf, "%lu\n", image_size); |
ca0aec0f RW |
546 | } |
547 | ||
823bccfc | 548 | static ssize_t image_size_store(struct kset *kset, const char *buf, size_t n) |
ca0aec0f | 549 | { |
853609b6 | 550 | unsigned long size; |
ca0aec0f | 551 | |
853609b6 | 552 | if (sscanf(buf, "%lu", &size) == 1) { |
ca0aec0f RW |
553 | image_size = size; |
554 | return n; | |
555 | } | |
556 | ||
557 | return -EINVAL; | |
558 | } | |
559 | ||
560 | power_attr(image_size); | |
561 | ||
1da177e4 LT |
562 | static struct attribute * g[] = { |
563 | &disk_attr.attr, | |
564 | &resume_attr.attr, | |
ca0aec0f | 565 | &image_size_attr.attr, |
1da177e4 LT |
566 | NULL, |
567 | }; | |
568 | ||
569 | ||
570 | static struct attribute_group attr_group = { | |
571 | .attrs = g, | |
572 | }; | |
573 | ||
574 | ||
575 | static int __init pm_disk_init(void) | |
576 | { | |
823bccfc | 577 | return sysfs_create_group(&power_subsys.kobj, &attr_group); |
1da177e4 LT |
578 | } |
579 | ||
580 | core_initcall(pm_disk_init); | |
581 | ||
582 | ||
583 | static int __init resume_setup(char *str) | |
584 | { | |
585 | if (noresume) | |
586 | return 1; | |
587 | ||
588 | strncpy( resume_file, str, 255 ); | |
589 | return 1; | |
590 | } | |
591 | ||
9a154d9d RW |
592 | static int __init resume_offset_setup(char *str) |
593 | { | |
594 | unsigned long long offset; | |
595 | ||
596 | if (noresume) | |
597 | return 1; | |
598 | ||
599 | if (sscanf(str, "%llu", &offset) == 1) | |
600 | swsusp_resume_block = offset; | |
601 | ||
602 | return 1; | |
603 | } | |
604 | ||
1da177e4 LT |
605 | static int __init noresume_setup(char *str) |
606 | { | |
607 | noresume = 1; | |
608 | return 1; | |
609 | } | |
610 | ||
611 | __setup("noresume", noresume_setup); | |
9a154d9d | 612 | __setup("resume_offset=", resume_offset_setup); |
1da177e4 | 613 | __setup("resume=", resume_setup); |