Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
[deliverable/linux.git] / kernel / power / disk.c
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/kmod.h>
18 #include <linux/delay.h>
19 #include <linux/fs.h>
20 #include <linux/mount.h>
21 #include <linux/pm.h>
22 #include <linux/console.h>
23 #include <linux/cpu.h>
24 #include <linux/freezer.h>
25 #include <linux/ftrace.h>
26
27 #include "power.h"
28
29
30 static int noresume = 0;
31 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
32 dev_t swsusp_resume_device;
33 sector_t swsusp_resume_block;
34
35 enum {
36 HIBERNATION_INVALID,
37 HIBERNATION_PLATFORM,
38 HIBERNATION_TEST,
39 HIBERNATION_TESTPROC,
40 HIBERNATION_SHUTDOWN,
41 HIBERNATION_REBOOT,
42 /* keep last */
43 __HIBERNATION_AFTER_LAST
44 };
45 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
46 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
47
48 static int hibernation_mode = HIBERNATION_SHUTDOWN;
49
50 static struct platform_hibernation_ops *hibernation_ops;
51
52 /**
53 * hibernation_set_ops - set the global hibernate operations
54 * @ops: the hibernation operations to use in subsequent hibernation transitions
55 */
56
57 void hibernation_set_ops(struct platform_hibernation_ops *ops)
58 {
59 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
60 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
61 && ops->restore_cleanup)) {
62 WARN_ON(1);
63 return;
64 }
65 mutex_lock(&pm_mutex);
66 hibernation_ops = ops;
67 if (ops)
68 hibernation_mode = HIBERNATION_PLATFORM;
69 else if (hibernation_mode == HIBERNATION_PLATFORM)
70 hibernation_mode = HIBERNATION_SHUTDOWN;
71
72 mutex_unlock(&pm_mutex);
73 }
74
75 #ifdef CONFIG_PM_DEBUG
76 static void hibernation_debug_sleep(void)
77 {
78 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
79 mdelay(5000);
80 }
81
82 static int hibernation_testmode(int mode)
83 {
84 if (hibernation_mode == mode) {
85 hibernation_debug_sleep();
86 return 1;
87 }
88 return 0;
89 }
90
91 static int hibernation_test(int level)
92 {
93 if (pm_test_level == level) {
94 hibernation_debug_sleep();
95 return 1;
96 }
97 return 0;
98 }
99 #else /* !CONFIG_PM_DEBUG */
100 static int hibernation_testmode(int mode) { return 0; }
101 static int hibernation_test(int level) { return 0; }
102 #endif /* !CONFIG_PM_DEBUG */
103
104 /**
105 * platform_begin - tell the platform driver that we're starting
106 * hibernation
107 */
108
109 static int platform_begin(int platform_mode)
110 {
111 return (platform_mode && hibernation_ops) ?
112 hibernation_ops->begin() : 0;
113 }
114
115 /**
116 * platform_end - tell the platform driver that we've entered the
117 * working state
118 */
119
120 static void platform_end(int platform_mode)
121 {
122 if (platform_mode && hibernation_ops)
123 hibernation_ops->end();
124 }
125
126 /**
127 * platform_pre_snapshot - prepare the machine for hibernation using the
128 * platform driver if so configured and return an error code if it fails
129 */
130
131 static int platform_pre_snapshot(int platform_mode)
132 {
133 return (platform_mode && hibernation_ops) ?
134 hibernation_ops->pre_snapshot() : 0;
135 }
136
137 /**
138 * platform_leave - prepare the machine for switching to the normal mode
139 * of operation using the platform driver (called with interrupts disabled)
140 */
141
142 static void platform_leave(int platform_mode)
143 {
144 if (platform_mode && hibernation_ops)
145 hibernation_ops->leave();
146 }
147
148 /**
149 * platform_finish - switch the machine to the normal mode of operation
150 * using the platform driver (must be called after platform_prepare())
151 */
152
153 static void platform_finish(int platform_mode)
154 {
155 if (platform_mode && hibernation_ops)
156 hibernation_ops->finish();
157 }
158
159 /**
160 * platform_pre_restore - prepare the platform for the restoration from a
161 * hibernation image. If the restore fails after this function has been
162 * called, platform_restore_cleanup() must be called.
163 */
164
165 static int platform_pre_restore(int platform_mode)
166 {
167 return (platform_mode && hibernation_ops) ?
168 hibernation_ops->pre_restore() : 0;
169 }
170
171 /**
172 * platform_restore_cleanup - switch the platform to the normal mode of
173 * operation after a failing restore. If platform_pre_restore() has been
174 * called before the failing restore, this function must be called too,
175 * regardless of the result of platform_pre_restore().
176 */
177
178 static void platform_restore_cleanup(int platform_mode)
179 {
180 if (platform_mode && hibernation_ops)
181 hibernation_ops->restore_cleanup();
182 }
183
184 /**
185 * platform_recover - recover the platform from a failure to suspend
186 * devices.
187 */
188
189 static void platform_recover(int platform_mode)
190 {
191 if (platform_mode && hibernation_ops && hibernation_ops->recover)
192 hibernation_ops->recover();
193 }
194
195 /**
196 * create_image - freeze devices that need to be frozen with interrupts
197 * off, create the hibernation image and thaw those devices. Control
198 * reappears in this routine after a restore.
199 */
200
201 static int create_image(int platform_mode)
202 {
203 int error;
204
205 error = arch_prepare_suspend();
206 if (error)
207 return error;
208
209 device_pm_lock();
210 local_irq_disable();
211 /* At this point, device_suspend() has been called, but *not*
212 * device_power_down(). We *must* call device_power_down() now.
213 * Otherwise, drivers for some devices (e.g. interrupt controllers)
214 * become desynchronized with the actual state of the hardware
215 * at resume time, and evil weirdness ensues.
216 */
217 error = device_power_down(PMSG_FREEZE);
218 if (error) {
219 printk(KERN_ERR "PM: Some devices failed to power down, "
220 "aborting hibernation\n");
221 goto Enable_irqs;
222 }
223
224 if (hibernation_test(TEST_CORE))
225 goto Power_up;
226
227 in_suspend = 1;
228 save_processor_state();
229 error = swsusp_arch_suspend();
230 if (error)
231 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
232 error);
233 /* Restore control flow magically appears here */
234 restore_processor_state();
235 if (!in_suspend)
236 platform_leave(platform_mode);
237 Power_up:
238 /* NOTE: device_power_up() is just a resume() for devices
239 * that suspended with irqs off ... no overall powerup.
240 */
241 device_power_up(in_suspend ?
242 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
243 Enable_irqs:
244 local_irq_enable();
245 device_pm_unlock();
246 return error;
247 }
248
249 /**
250 * hibernation_snapshot - quiesce devices and create the hibernation
251 * snapshot image.
252 * @platform_mode - if set, use the platform driver, if available, to
253 * prepare the platform frimware for the power transition.
254 *
255 * Must be called with pm_mutex held
256 */
257
258 int hibernation_snapshot(int platform_mode)
259 {
260 int error, ftrace_save;
261
262 /* Free memory before shutting down devices. */
263 error = swsusp_shrink_memory();
264 if (error)
265 return error;
266
267 error = platform_begin(platform_mode);
268 if (error)
269 goto Close;
270
271 suspend_console();
272 ftrace_save = __ftrace_enabled_save();
273 error = device_suspend(PMSG_FREEZE);
274 if (error)
275 goto Recover_platform;
276
277 if (hibernation_test(TEST_DEVICES))
278 goto Recover_platform;
279
280 error = platform_pre_snapshot(platform_mode);
281 if (error || hibernation_test(TEST_PLATFORM))
282 goto Finish;
283
284 error = disable_nonboot_cpus();
285 if (!error) {
286 if (hibernation_test(TEST_CPUS))
287 goto Enable_cpus;
288
289 if (hibernation_testmode(HIBERNATION_TEST))
290 goto Enable_cpus;
291
292 error = create_image(platform_mode);
293 /* Control returns here after successful restore */
294 }
295 Enable_cpus:
296 enable_nonboot_cpus();
297 Finish:
298 platform_finish(platform_mode);
299 Resume_devices:
300 device_resume(in_suspend ?
301 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
302 __ftrace_enabled_restore(ftrace_save);
303 resume_console();
304 Close:
305 platform_end(platform_mode);
306 return error;
307
308 Recover_platform:
309 platform_recover(platform_mode);
310 goto Resume_devices;
311 }
312
313 /**
314 * resume_target_kernel - prepare devices that need to be suspended with
315 * interrupts off, restore the contents of highmem that have not been
316 * restored yet from the image and run the low level code that will restore
317 * the remaining contents of memory and switch to the just restored target
318 * kernel.
319 */
320
321 static int resume_target_kernel(void)
322 {
323 int error;
324
325 device_pm_lock();
326 local_irq_disable();
327 error = device_power_down(PMSG_QUIESCE);
328 if (error) {
329 printk(KERN_ERR "PM: Some devices failed to power down, "
330 "aborting resume\n");
331 goto Enable_irqs;
332 }
333 /* We'll ignore saved state, but this gets preempt count (etc) right */
334 save_processor_state();
335 error = restore_highmem();
336 if (!error) {
337 error = swsusp_arch_resume();
338 /*
339 * The code below is only ever reached in case of a failure.
340 * Otherwise execution continues at place where
341 * swsusp_arch_suspend() was called
342 */
343 BUG_ON(!error);
344 /* This call to restore_highmem() undos the previous one */
345 restore_highmem();
346 }
347 /*
348 * The only reason why swsusp_arch_resume() can fail is memory being
349 * very tight, so we have to free it as soon as we can to avoid
350 * subsequent failures
351 */
352 swsusp_free();
353 restore_processor_state();
354 touch_softlockup_watchdog();
355 device_power_up(PMSG_RECOVER);
356 Enable_irqs:
357 local_irq_enable();
358 device_pm_unlock();
359 return error;
360 }
361
362 /**
363 * hibernation_restore - quiesce devices and restore the hibernation
364 * snapshot image. If successful, control returns in hibernation_snaphot()
365 * @platform_mode - if set, use the platform driver, if available, to
366 * prepare the platform frimware for the transition.
367 *
368 * Must be called with pm_mutex held
369 */
370
371 int hibernation_restore(int platform_mode)
372 {
373 int error, ftrace_save;
374
375 pm_prepare_console();
376 suspend_console();
377 ftrace_save = __ftrace_enabled_save();
378 error = device_suspend(PMSG_QUIESCE);
379 if (error)
380 goto Finish;
381
382 error = platform_pre_restore(platform_mode);
383 if (!error) {
384 error = disable_nonboot_cpus();
385 if (!error)
386 error = resume_target_kernel();
387 enable_nonboot_cpus();
388 }
389 platform_restore_cleanup(platform_mode);
390 device_resume(PMSG_RECOVER);
391 Finish:
392 __ftrace_enabled_restore(ftrace_save);
393 resume_console();
394 pm_restore_console();
395 return error;
396 }
397
398 /**
399 * hibernation_platform_enter - enter the hibernation state using the
400 * platform driver (if available)
401 */
402
403 int hibernation_platform_enter(void)
404 {
405 int error, ftrace_save;
406
407 if (!hibernation_ops)
408 return -ENOSYS;
409
410 /*
411 * We have cancelled the power transition by running
412 * hibernation_ops->finish() before saving the image, so we should let
413 * the firmware know that we're going to enter the sleep state after all
414 */
415 error = hibernation_ops->begin();
416 if (error)
417 goto Close;
418
419 suspend_console();
420 ftrace_save = __ftrace_enabled_save();
421 error = device_suspend(PMSG_HIBERNATE);
422 if (error) {
423 if (hibernation_ops->recover)
424 hibernation_ops->recover();
425 goto Resume_devices;
426 }
427
428 error = hibernation_ops->prepare();
429 if (error)
430 goto Resume_devices;
431
432 error = disable_nonboot_cpus();
433 if (error)
434 goto Finish;
435
436 device_pm_lock();
437 local_irq_disable();
438 error = device_power_down(PMSG_HIBERNATE);
439 if (!error) {
440 hibernation_ops->enter();
441 /* We should never get here */
442 while (1);
443 }
444 local_irq_enable();
445 device_pm_unlock();
446
447 /*
448 * We don't need to reenable the nonboot CPUs or resume consoles, since
449 * the system is going to be halted anyway.
450 */
451 Finish:
452 hibernation_ops->finish();
453 Resume_devices:
454 device_resume(PMSG_RESTORE);
455 __ftrace_enabled_restore(ftrace_save);
456 resume_console();
457 Close:
458 hibernation_ops->end();
459 return error;
460 }
461
462 /**
463 * power_down - Shut the machine down for hibernation.
464 *
465 * Use the platform driver, if configured so; otherwise try
466 * to power off or reboot.
467 */
468
469 static void power_down(void)
470 {
471 switch (hibernation_mode) {
472 case HIBERNATION_TEST:
473 case HIBERNATION_TESTPROC:
474 break;
475 case HIBERNATION_REBOOT:
476 kernel_restart(NULL);
477 break;
478 case HIBERNATION_PLATFORM:
479 hibernation_platform_enter();
480 case HIBERNATION_SHUTDOWN:
481 kernel_power_off();
482 break;
483 }
484 kernel_halt();
485 /*
486 * Valid image is on the disk, if we continue we risk serious data
487 * corruption after resume.
488 */
489 printk(KERN_CRIT "PM: Please power down manually\n");
490 while(1);
491 }
492
493 static int prepare_processes(void)
494 {
495 int error = 0;
496
497 if (freeze_processes()) {
498 error = -EBUSY;
499 thaw_processes();
500 }
501 return error;
502 }
503
504 /**
505 * hibernate - The granpappy of the built-in hibernation management
506 */
507
508 int hibernate(void)
509 {
510 int error;
511
512 mutex_lock(&pm_mutex);
513 /* The snapshot device should not be opened while we're running */
514 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
515 error = -EBUSY;
516 goto Unlock;
517 }
518
519 pm_prepare_console();
520 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
521 if (error)
522 goto Exit;
523
524 error = usermodehelper_disable();
525 if (error)
526 goto Exit;
527
528 /* Allocate memory management structures */
529 error = create_basic_memory_bitmaps();
530 if (error)
531 goto Exit;
532
533 printk(KERN_INFO "PM: Syncing filesystems ... ");
534 sys_sync();
535 printk("done.\n");
536
537 error = prepare_processes();
538 if (error)
539 goto Finish;
540
541 if (hibernation_test(TEST_FREEZER))
542 goto Thaw;
543
544 if (hibernation_testmode(HIBERNATION_TESTPROC))
545 goto Thaw;
546
547 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
548 if (in_suspend && !error) {
549 unsigned int flags = 0;
550
551 if (hibernation_mode == HIBERNATION_PLATFORM)
552 flags |= SF_PLATFORM_MODE;
553 pr_debug("PM: writing image.\n");
554 error = swsusp_write(flags);
555 swsusp_free();
556 if (!error)
557 power_down();
558 } else {
559 pr_debug("PM: Image restored successfully.\n");
560 swsusp_free();
561 }
562 Thaw:
563 thaw_processes();
564 Finish:
565 free_basic_memory_bitmaps();
566 usermodehelper_enable();
567 Exit:
568 pm_notifier_call_chain(PM_POST_HIBERNATION);
569 pm_restore_console();
570 atomic_inc(&snapshot_device_available);
571 Unlock:
572 mutex_unlock(&pm_mutex);
573 return error;
574 }
575
576
577 /**
578 * software_resume - Resume from a saved image.
579 *
580 * Called as a late_initcall (so all devices are discovered and
581 * initialized), we call swsusp to see if we have a saved image or not.
582 * If so, we quiesce devices, the restore the saved image. We will
583 * return above (in hibernate() ) if everything goes well.
584 * Otherwise, we fail gracefully and return to the normally
585 * scheduled program.
586 *
587 */
588
589 static int software_resume(void)
590 {
591 int error;
592 unsigned int flags;
593
594 /*
595 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
596 * is configured into the kernel. Since the regular hibernate
597 * trigger path is via sysfs which takes a buffer mutex before
598 * calling hibernate functions (which take pm_mutex) this can
599 * cause lockdep to complain about a possible ABBA deadlock
600 * which cannot happen since we're in the boot code here and
601 * sysfs can't be invoked yet. Therefore, we use a subclass
602 * here to avoid lockdep complaining.
603 */
604 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
605 if (!swsusp_resume_device) {
606 if (!strlen(resume_file)) {
607 mutex_unlock(&pm_mutex);
608 return -ENOENT;
609 }
610 swsusp_resume_device = name_to_dev_t(resume_file);
611 pr_debug("PM: Resume from partition %s\n", resume_file);
612 } else {
613 pr_debug("PM: Resume from partition %d:%d\n",
614 MAJOR(swsusp_resume_device),
615 MINOR(swsusp_resume_device));
616 }
617
618 if (noresume) {
619 /**
620 * FIXME: If noresume is specified, we need to find the
621 * partition and reset it back to normal swap space.
622 */
623 mutex_unlock(&pm_mutex);
624 return 0;
625 }
626
627 pr_debug("PM: Checking hibernation image.\n");
628 error = swsusp_check();
629 if (error)
630 goto Unlock;
631
632 /* The snapshot device should not be opened while we're running */
633 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
634 error = -EBUSY;
635 goto Unlock;
636 }
637
638 pm_prepare_console();
639 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
640 if (error)
641 goto Finish;
642
643 error = usermodehelper_disable();
644 if (error)
645 goto Finish;
646
647 error = create_basic_memory_bitmaps();
648 if (error)
649 goto Finish;
650
651 pr_debug("PM: Preparing processes for restore.\n");
652 error = prepare_processes();
653 if (error) {
654 swsusp_close();
655 goto Done;
656 }
657
658 pr_debug("PM: Reading hibernation image.\n");
659
660 error = swsusp_read(&flags);
661 if (!error)
662 hibernation_restore(flags & SF_PLATFORM_MODE);
663
664 printk(KERN_ERR "PM: Restore failed, recovering.\n");
665 swsusp_free();
666 thaw_processes();
667 Done:
668 free_basic_memory_bitmaps();
669 usermodehelper_enable();
670 Finish:
671 pm_notifier_call_chain(PM_POST_RESTORE);
672 pm_restore_console();
673 atomic_inc(&snapshot_device_available);
674 /* For success case, the suspend path will release the lock */
675 Unlock:
676 mutex_unlock(&pm_mutex);
677 pr_debug("PM: Resume from disk failed.\n");
678 return error;
679 }
680
681 late_initcall(software_resume);
682
683
684 static const char * const hibernation_modes[] = {
685 [HIBERNATION_PLATFORM] = "platform",
686 [HIBERNATION_SHUTDOWN] = "shutdown",
687 [HIBERNATION_REBOOT] = "reboot",
688 [HIBERNATION_TEST] = "test",
689 [HIBERNATION_TESTPROC] = "testproc",
690 };
691
692 /**
693 * disk - Control hibernation mode
694 *
695 * Suspend-to-disk can be handled in several ways. We have a few options
696 * for putting the system to sleep - using the platform driver (e.g. ACPI
697 * or other hibernation_ops), powering off the system or rebooting the
698 * system (for testing) as well as the two test modes.
699 *
700 * The system can support 'platform', and that is known a priori (and
701 * encoded by the presence of hibernation_ops). However, the user may
702 * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
703 * test modes, 'test' or 'testproc'.
704 *
705 * show() will display what the mode is currently set to.
706 * store() will accept one of
707 *
708 * 'platform'
709 * 'shutdown'
710 * 'reboot'
711 * 'test'
712 * 'testproc'
713 *
714 * It will only change to 'platform' if the system
715 * supports it (as determined by having hibernation_ops).
716 */
717
718 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
719 char *buf)
720 {
721 int i;
722 char *start = buf;
723
724 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
725 if (!hibernation_modes[i])
726 continue;
727 switch (i) {
728 case HIBERNATION_SHUTDOWN:
729 case HIBERNATION_REBOOT:
730 case HIBERNATION_TEST:
731 case HIBERNATION_TESTPROC:
732 break;
733 case HIBERNATION_PLATFORM:
734 if (hibernation_ops)
735 break;
736 /* not a valid mode, continue with loop */
737 continue;
738 }
739 if (i == hibernation_mode)
740 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
741 else
742 buf += sprintf(buf, "%s ", hibernation_modes[i]);
743 }
744 buf += sprintf(buf, "\n");
745 return buf-start;
746 }
747
748
749 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
750 const char *buf, size_t n)
751 {
752 int error = 0;
753 int i;
754 int len;
755 char *p;
756 int mode = HIBERNATION_INVALID;
757
758 p = memchr(buf, '\n', n);
759 len = p ? p - buf : n;
760
761 mutex_lock(&pm_mutex);
762 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
763 if (len == strlen(hibernation_modes[i])
764 && !strncmp(buf, hibernation_modes[i], len)) {
765 mode = i;
766 break;
767 }
768 }
769 if (mode != HIBERNATION_INVALID) {
770 switch (mode) {
771 case HIBERNATION_SHUTDOWN:
772 case HIBERNATION_REBOOT:
773 case HIBERNATION_TEST:
774 case HIBERNATION_TESTPROC:
775 hibernation_mode = mode;
776 break;
777 case HIBERNATION_PLATFORM:
778 if (hibernation_ops)
779 hibernation_mode = mode;
780 else
781 error = -EINVAL;
782 }
783 } else
784 error = -EINVAL;
785
786 if (!error)
787 pr_debug("PM: Hibernation mode set to '%s'\n",
788 hibernation_modes[mode]);
789 mutex_unlock(&pm_mutex);
790 return error ? error : n;
791 }
792
793 power_attr(disk);
794
795 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
796 char *buf)
797 {
798 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
799 MINOR(swsusp_resume_device));
800 }
801
802 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
803 const char *buf, size_t n)
804 {
805 unsigned int maj, min;
806 dev_t res;
807 int ret = -EINVAL;
808
809 if (sscanf(buf, "%u:%u", &maj, &min) != 2)
810 goto out;
811
812 res = MKDEV(maj,min);
813 if (maj != MAJOR(res) || min != MINOR(res))
814 goto out;
815
816 mutex_lock(&pm_mutex);
817 swsusp_resume_device = res;
818 mutex_unlock(&pm_mutex);
819 printk(KERN_INFO "PM: Starting manual resume from disk\n");
820 noresume = 0;
821 software_resume();
822 ret = n;
823 out:
824 return ret;
825 }
826
827 power_attr(resume);
828
829 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
830 char *buf)
831 {
832 return sprintf(buf, "%lu\n", image_size);
833 }
834
835 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
836 const char *buf, size_t n)
837 {
838 unsigned long size;
839
840 if (sscanf(buf, "%lu", &size) == 1) {
841 image_size = size;
842 return n;
843 }
844
845 return -EINVAL;
846 }
847
848 power_attr(image_size);
849
850 static struct attribute * g[] = {
851 &disk_attr.attr,
852 &resume_attr.attr,
853 &image_size_attr.attr,
854 NULL,
855 };
856
857
858 static struct attribute_group attr_group = {
859 .attrs = g,
860 };
861
862
863 static int __init pm_disk_init(void)
864 {
865 return sysfs_create_group(power_kobj, &attr_group);
866 }
867
868 core_initcall(pm_disk_init);
869
870
871 static int __init resume_setup(char *str)
872 {
873 if (noresume)
874 return 1;
875
876 strncpy( resume_file, str, 255 );
877 return 1;
878 }
879
880 static int __init resume_offset_setup(char *str)
881 {
882 unsigned long long offset;
883
884 if (noresume)
885 return 1;
886
887 if (sscanf(str, "%llu", &offset) == 1)
888 swsusp_resume_block = offset;
889
890 return 1;
891 }
892
893 static int __init noresume_setup(char *str)
894 {
895 noresume = 1;
896 return 1;
897 }
898
899 __setup("noresume", noresume_setup);
900 __setup("resume_offset=", resume_offset_setup);
901 __setup("resume=", resume_setup);
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