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-rw-r--r--kernel/power/disk.c955
1 files changed, 0 insertions, 955 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
deleted file mode 100644
index a9beba68b6c7..000000000000
--- a/kernel/power/disk.c
+++ /dev/null
@@ -1,955 +0,0 @@
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 <scsi/scsi_scan.h>
26#include <asm/suspend.h>
27
28#include "power.h"
29
30
31static int noresume = 0;
32static char resume_file[256] = CONFIG_PM_STD_PARTITION;
33dev_t swsusp_resume_device;
34sector_t swsusp_resume_block;
35
36enum {
37 HIBERNATION_INVALID,
38 HIBERNATION_PLATFORM,
39 HIBERNATION_TEST,
40 HIBERNATION_TESTPROC,
41 HIBERNATION_SHUTDOWN,
42 HIBERNATION_REBOOT,
43 /* keep last */
44 __HIBERNATION_AFTER_LAST
45};
46#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
47#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
48
49static int hibernation_mode = HIBERNATION_SHUTDOWN;
50
51static struct platform_hibernation_ops *hibernation_ops;
52
53/**
54 * hibernation_set_ops - set the global hibernate operations
55 * @ops: the hibernation operations to use in subsequent hibernation transitions
56 */
57
58void hibernation_set_ops(struct platform_hibernation_ops *ops)
59{
60 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
61 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
62 && ops->restore_cleanup)) {
63 WARN_ON(1);
64 return;
65 }
66 mutex_lock(&pm_mutex);
67 hibernation_ops = ops;
68 if (ops)
69 hibernation_mode = HIBERNATION_PLATFORM;
70 else if (hibernation_mode == HIBERNATION_PLATFORM)
71 hibernation_mode = HIBERNATION_SHUTDOWN;
72
73 mutex_unlock(&pm_mutex);
74}
75
76static bool entering_platform_hibernation;
77
78bool system_entering_hibernation(void)
79{
80 return entering_platform_hibernation;
81}
82EXPORT_SYMBOL(system_entering_hibernation);
83
84#ifdef CONFIG_PM_DEBUG
85static void hibernation_debug_sleep(void)
86{
87 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
88 mdelay(5000);
89}
90
91static int hibernation_testmode(int mode)
92{
93 if (hibernation_mode == mode) {
94 hibernation_debug_sleep();
95 return 1;
96 }
97 return 0;
98}
99
100static int hibernation_test(int level)
101{
102 if (pm_test_level == level) {
103 hibernation_debug_sleep();
104 return 1;
105 }
106 return 0;
107}
108#else /* !CONFIG_PM_DEBUG */
109static int hibernation_testmode(int mode) { return 0; }
110static int hibernation_test(int level) { return 0; }
111#endif /* !CONFIG_PM_DEBUG */
112
113/**
114 * platform_begin - tell the platform driver that we're starting
115 * hibernation
116 */
117
118static int platform_begin(int platform_mode)
119{
120 return (platform_mode && hibernation_ops) ?
121 hibernation_ops->begin() : 0;
122}
123
124/**
125 * platform_end - tell the platform driver that we've entered the
126 * working state
127 */
128
129static void platform_end(int platform_mode)
130{
131 if (platform_mode && hibernation_ops)
132 hibernation_ops->end();
133}
134
135/**
136 * platform_pre_snapshot - prepare the machine for hibernation using the
137 * platform driver if so configured and return an error code if it fails
138 */
139
140static int platform_pre_snapshot(int platform_mode)
141{
142 return (platform_mode && hibernation_ops) ?
143 hibernation_ops->pre_snapshot() : 0;
144}
145
146/**
147 * platform_leave - prepare the machine for switching to the normal mode
148 * of operation using the platform driver (called with interrupts disabled)
149 */
150
151static void platform_leave(int platform_mode)
152{
153 if (platform_mode && hibernation_ops)
154 hibernation_ops->leave();
155}
156
157/**
158 * platform_finish - switch the machine to the normal mode of operation
159 * using the platform driver (must be called after platform_prepare())
160 */
161
162static void platform_finish(int platform_mode)
163{
164 if (platform_mode && hibernation_ops)
165 hibernation_ops->finish();
166}
167
168/**
169 * platform_pre_restore - prepare the platform for the restoration from a
170 * hibernation image. If the restore fails after this function has been
171 * called, platform_restore_cleanup() must be called.
172 */
173
174static int platform_pre_restore(int platform_mode)
175{
176 return (platform_mode && hibernation_ops) ?
177 hibernation_ops->pre_restore() : 0;
178}
179
180/**
181 * platform_restore_cleanup - switch the platform to the normal mode of
182 * operation after a failing restore. If platform_pre_restore() has been
183 * called before the failing restore, this function must be called too,
184 * regardless of the result of platform_pre_restore().
185 */
186
187static void platform_restore_cleanup(int platform_mode)
188{
189 if (platform_mode && hibernation_ops)
190 hibernation_ops->restore_cleanup();
191}
192
193/**
194 * platform_recover - recover the platform from a failure to suspend
195 * devices.
196 */
197
198static void platform_recover(int platform_mode)
199{
200 if (platform_mode && hibernation_ops && hibernation_ops->recover)
201 hibernation_ops->recover();
202}
203
204/**
205 * create_image - freeze devices that need to be frozen with interrupts
206 * off, create the hibernation image and thaw those devices. Control
207 * reappears in this routine after a restore.
208 */
209
210static int create_image(int platform_mode)
211{
212 int error;
213
214 error = arch_prepare_suspend();
215 if (error)
216 return error;
217
218 /* At this point, dpm_suspend_start() has been called, but *not*
219 * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
220 * Otherwise, drivers for some devices (e.g. interrupt controllers)
221 * become desynchronized with the actual state of the hardware
222 * at resume time, and evil weirdness ensues.
223 */
224 error = dpm_suspend_noirq(PMSG_FREEZE);
225 if (error) {
226 printk(KERN_ERR "PM: Some devices failed to power down, "
227 "aborting hibernation\n");
228 return error;
229 }
230
231 error = platform_pre_snapshot(platform_mode);
232 if (error || hibernation_test(TEST_PLATFORM))
233 goto Platform_finish;
234
235 error = disable_nonboot_cpus();
236 if (error || hibernation_test(TEST_CPUS)
237 || hibernation_testmode(HIBERNATION_TEST))
238 goto Enable_cpus;
239
240 local_irq_disable();
241
242 error = sysdev_suspend(PMSG_FREEZE);
243 if (error) {
244 printk(KERN_ERR "PM: Some system devices failed to power down, "
245 "aborting hibernation\n");
246 goto Enable_irqs;
247 }
248
249 if (hibernation_test(TEST_CORE))
250 goto Power_up;
251
252 in_suspend = 1;
253 save_processor_state();
254 error = swsusp_arch_suspend();
255 if (error)
256 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
257 error);
258 /* Restore control flow magically appears here */
259 restore_processor_state();
260 if (!in_suspend)
261 platform_leave(platform_mode);
262
263 Power_up:
264 sysdev_resume();
265 /* NOTE: dpm_resume_noirq() is just a resume() for devices
266 * that suspended with irqs off ... no overall powerup.
267 */
268
269 Enable_irqs:
270 local_irq_enable();
271
272 Enable_cpus:
273 enable_nonboot_cpus();
274
275 Platform_finish:
276 platform_finish(platform_mode);
277
278 dpm_resume_noirq(in_suspend ?
279 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
280
281 return error;
282}
283
284/**
285 * hibernation_snapshot - quiesce devices and create the hibernation
286 * snapshot image.
287 * @platform_mode - if set, use the platform driver, if available, to
288 * prepare the platform firmware for the power transition.
289 *
290 * Must be called with pm_mutex held
291 */
292
293int hibernation_snapshot(int platform_mode)
294{
295 int error;
296
297 error = platform_begin(platform_mode);
298 if (error)
299 return error;
300
301 /* Free memory before shutting down devices. */
302 error = swsusp_shrink_memory();
303 if (error)
304 goto Close;
305
306 suspend_console();
307 error = dpm_suspend_start(PMSG_FREEZE);
308 if (error)
309 goto Recover_platform;
310
311 if (hibernation_test(TEST_DEVICES))
312 goto Recover_platform;
313
314 error = create_image(platform_mode);
315 /* Control returns here after successful restore */
316
317 Resume_devices:
318 dpm_resume_end(in_suspend ?
319 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
320 resume_console();
321 Close:
322 platform_end(platform_mode);
323 return error;
324
325 Recover_platform:
326 platform_recover(platform_mode);
327 goto Resume_devices;
328}
329
330/**
331 * resume_target_kernel - prepare devices that need to be suspended with
332 * interrupts off, restore the contents of highmem that have not been
333 * restored yet from the image and run the low level code that will restore
334 * the remaining contents of memory and switch to the just restored target
335 * kernel.
336 */
337
338static int resume_target_kernel(bool platform_mode)
339{
340 int error;
341
342 error = dpm_suspend_noirq(PMSG_QUIESCE);
343 if (error) {
344 printk(KERN_ERR "PM: Some devices failed to power down, "
345 "aborting resume\n");
346 return error;
347 }
348
349 error = platform_pre_restore(platform_mode);
350 if (error)
351 goto Cleanup;
352
353 error = disable_nonboot_cpus();
354 if (error)
355 goto Enable_cpus;
356
357 local_irq_disable();
358
359 error = sysdev_suspend(PMSG_QUIESCE);
360 if (error)
361 goto Enable_irqs;
362
363 /* We'll ignore saved state, but this gets preempt count (etc) right */
364 save_processor_state();
365 error = restore_highmem();
366 if (!error) {
367 error = swsusp_arch_resume();
368 /*
369 * The code below is only ever reached in case of a failure.
370 * Otherwise execution continues at place where
371 * swsusp_arch_suspend() was called
372 */
373 BUG_ON(!error);
374 /* This call to restore_highmem() undos the previous one */
375 restore_highmem();
376 }
377 /*
378 * The only reason why swsusp_arch_resume() can fail is memory being
379 * very tight, so we have to free it as soon as we can to avoid
380 * subsequent failures
381 */
382 swsusp_free();
383 restore_processor_state();
384 touch_softlockup_watchdog();
385
386 sysdev_resume();
387
388 Enable_irqs:
389 local_irq_enable();
390
391 Enable_cpus:
392 enable_nonboot_cpus();
393
394 Cleanup:
395 platform_restore_cleanup(platform_mode);
396
397 dpm_resume_noirq(PMSG_RECOVER);
398
399 return error;
400}
401
402/**
403 * hibernation_restore - quiesce devices and restore the hibernation
404 * snapshot image. If successful, control returns in hibernation_snaphot()
405 * @platform_mode - if set, use the platform driver, if available, to
406 * prepare the platform firmware for the transition.
407 *
408 * Must be called with pm_mutex held
409 */
410
411int hibernation_restore(int platform_mode)
412{
413 int error;
414
415 pm_prepare_console();
416 suspend_console();
417 error = dpm_suspend_start(PMSG_QUIESCE);
418 if (!error) {
419 error = resume_target_kernel(platform_mode);
420 dpm_resume_end(PMSG_RECOVER);
421 }
422 resume_console();
423 pm_restore_console();
424 return error;
425}
426
427/**
428 * hibernation_platform_enter - enter the hibernation state using the
429 * platform driver (if available)
430 */
431
432int hibernation_platform_enter(void)
433{
434 int error;
435
436 if (!hibernation_ops)
437 return -ENOSYS;
438
439 /*
440 * We have cancelled the power transition by running
441 * hibernation_ops->finish() before saving the image, so we should let
442 * the firmware know that we're going to enter the sleep state after all
443 */
444 error = hibernation_ops->begin();
445 if (error)
446 goto Close;
447
448 entering_platform_hibernation = true;
449 suspend_console();
450 error = dpm_suspend_start(PMSG_HIBERNATE);
451 if (error) {
452 if (hibernation_ops->recover)
453 hibernation_ops->recover();
454 goto Resume_devices;
455 }
456
457 error = dpm_suspend_noirq(PMSG_HIBERNATE);
458 if (error)
459 goto Resume_devices;
460
461 error = hibernation_ops->prepare();
462 if (error)
463 goto Platofrm_finish;
464
465 error = disable_nonboot_cpus();
466 if (error)
467 goto Platofrm_finish;
468
469 local_irq_disable();
470 sysdev_suspend(PMSG_HIBERNATE);
471 hibernation_ops->enter();
472 /* We should never get here */
473 while (1);
474
475 /*
476 * We don't need to reenable the nonboot CPUs or resume consoles, since
477 * the system is going to be halted anyway.
478 */
479 Platofrm_finish:
480 hibernation_ops->finish();
481
482 dpm_suspend_noirq(PMSG_RESTORE);
483
484 Resume_devices:
485 entering_platform_hibernation = false;
486 dpm_resume_end(PMSG_RESTORE);
487 resume_console();
488
489 Close:
490 hibernation_ops->end();
491
492 return error;
493}
494
495/**
496 * power_down - Shut the machine down for hibernation.
497 *
498 * Use the platform driver, if configured so; otherwise try
499 * to power off or reboot.
500 */
501
502static void power_down(void)
503{
504 switch (hibernation_mode) {
505 case HIBERNATION_TEST:
506 case HIBERNATION_TESTPROC:
507 break;
508 case HIBERNATION_REBOOT:
509 kernel_restart(NULL);
510 break;
511 case HIBERNATION_PLATFORM:
512 hibernation_platform_enter();
513 case HIBERNATION_SHUTDOWN:
514 kernel_power_off();
515 break;
516 }
517 kernel_halt();
518 /*
519 * Valid image is on the disk, if we continue we risk serious data
520 * corruption after resume.
521 */
522 printk(KERN_CRIT "PM: Please power down manually\n");
523 while(1);
524}
525
526static int prepare_processes(void)
527{
528 int error = 0;
529
530 if (freeze_processes()) {
531 error = -EBUSY;
532 thaw_processes();
533 }
534 return error;
535}
536
537/**
538 * hibernate - The granpappy of the built-in hibernation management
539 */
540
541int hibernate(void)
542{
543 int error;
544
545 mutex_lock(&pm_mutex);
546 /* The snapshot device should not be opened while we're running */
547 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
548 error = -EBUSY;
549 goto Unlock;
550 }
551
552 pm_prepare_console();
553 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
554 if (error)
555 goto Exit;
556
557 error = usermodehelper_disable();
558 if (error)
559 goto Exit;
560
561 /* Allocate memory management structures */
562 error = create_basic_memory_bitmaps();
563 if (error)
564 goto Exit;
565
566 printk(KERN_INFO "PM: Syncing filesystems ... ");
567 sys_sync();
568 printk("done.\n");
569
570 error = prepare_processes();
571 if (error)
572 goto Finish;
573
574 if (hibernation_test(TEST_FREEZER))
575 goto Thaw;
576
577 if (hibernation_testmode(HIBERNATION_TESTPROC))
578 goto Thaw;
579
580 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
581 if (in_suspend && !error) {
582 unsigned int flags = 0;
583
584 if (hibernation_mode == HIBERNATION_PLATFORM)
585 flags |= SF_PLATFORM_MODE;
586 pr_debug("PM: writing image.\n");
587 error = swsusp_write(flags);
588 swsusp_free();
589 if (!error)
590 power_down();
591 } else {
592 pr_debug("PM: Image restored successfully.\n");
593 swsusp_free();
594 }
595 Thaw:
596 thaw_processes();
597 Finish:
598 free_basic_memory_bitmaps();
599 usermodehelper_enable();
600 Exit:
601 pm_notifier_call_chain(PM_POST_HIBERNATION);
602 pm_restore_console();
603 atomic_inc(&snapshot_device_available);
604 Unlock:
605 mutex_unlock(&pm_mutex);
606 return error;
607}
608
609
610/**
611 * software_resume - Resume from a saved image.
612 *
613 * Called as a late_initcall (so all devices are discovered and
614 * initialized), we call swsusp to see if we have a saved image or not.
615 * If so, we quiesce devices, the restore the saved image. We will
616 * return above (in hibernate() ) if everything goes well.
617 * Otherwise, we fail gracefully and return to the normally
618 * scheduled program.
619 *
620 */
621
622static int software_resume(void)
623{
624 int error;
625 unsigned int flags;
626
627 /*
628 * If the user said "noresume".. bail out early.
629 */
630 if (noresume)
631 return 0;
632
633 /*
634 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
635 * is configured into the kernel. Since the regular hibernate
636 * trigger path is via sysfs which takes a buffer mutex before
637 * calling hibernate functions (which take pm_mutex) this can
638 * cause lockdep to complain about a possible ABBA deadlock
639 * which cannot happen since we're in the boot code here and
640 * sysfs can't be invoked yet. Therefore, we use a subclass
641 * here to avoid lockdep complaining.
642 */
643 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
644
645 if (swsusp_resume_device)
646 goto Check_image;
647
648 if (!strlen(resume_file)) {
649 error = -ENOENT;
650 goto Unlock;
651 }
652
653 pr_debug("PM: Checking image partition %s\n", resume_file);
654
655 /* Check if the device is there */
656 swsusp_resume_device = name_to_dev_t(resume_file);
657 if (!swsusp_resume_device) {
658 /*
659 * Some device discovery might still be in progress; we need
660 * to wait for this to finish.
661 */
662 wait_for_device_probe();
663 /*
664 * We can't depend on SCSI devices being available after loading
665 * one of their modules until scsi_complete_async_scans() is
666 * called and the resume device usually is a SCSI one.
667 */
668 scsi_complete_async_scans();
669
670 swsusp_resume_device = name_to_dev_t(resume_file);
671 if (!swsusp_resume_device) {
672 error = -ENODEV;
673 goto Unlock;
674 }
675 }
676
677 Check_image:
678 pr_debug("PM: Resume from partition %d:%d\n",
679 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
680
681 pr_debug("PM: Checking hibernation image.\n");
682 error = swsusp_check();
683 if (error)
684 goto Unlock;
685
686 /* The snapshot device should not be opened while we're running */
687 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
688 error = -EBUSY;
689 goto Unlock;
690 }
691
692 pm_prepare_console();
693 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
694 if (error)
695 goto Finish;
696
697 error = usermodehelper_disable();
698 if (error)
699 goto Finish;
700
701 error = create_basic_memory_bitmaps();
702 if (error)
703 goto Finish;
704
705 pr_debug("PM: Preparing processes for restore.\n");
706 error = prepare_processes();
707 if (error) {
708 swsusp_close(FMODE_READ);
709 goto Done;
710 }
711
712 pr_debug("PM: Reading hibernation image.\n");
713
714 error = swsusp_read(&flags);
715 if (!error)
716 hibernation_restore(flags & SF_PLATFORM_MODE);
717
718 printk(KERN_ERR "PM: Restore failed, recovering.\n");
719 swsusp_free();
720 thaw_processes();
721 Done:
722 free_basic_memory_bitmaps();
723 usermodehelper_enable();
724 Finish:
725 pm_notifier_call_chain(PM_POST_RESTORE);
726 pm_restore_console();
727 atomic_inc(&snapshot_device_available);
728 /* For success case, the suspend path will release the lock */
729 Unlock:
730 mutex_unlock(&pm_mutex);
731 pr_debug("PM: Resume from disk failed.\n");
732 return error;
733}
734
735late_initcall(software_resume);
736
737
738static const char * const hibernation_modes[] = {
739 [HIBERNATION_PLATFORM] = "platform",
740 [HIBERNATION_SHUTDOWN] = "shutdown",
741 [HIBERNATION_REBOOT] = "reboot",
742 [HIBERNATION_TEST] = "test",
743 [HIBERNATION_TESTPROC] = "testproc",
744};
745
746/**
747 * disk - Control hibernation mode
748 *
749 * Suspend-to-disk can be handled in several ways. We have a few options
750 * for putting the system to sleep - using the platform driver (e.g. ACPI
751 * or other hibernation_ops), powering off the system or rebooting the
752 * system (for testing) as well as the two test modes.
753 *
754 * The system can support 'platform', and that is known a priori (and
755 * encoded by the presence of hibernation_ops). However, the user may
756 * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
757 * test modes, 'test' or 'testproc'.
758 *
759 * show() will display what the mode is currently set to.
760 * store() will accept one of
761 *
762 * 'platform'
763 * 'shutdown'
764 * 'reboot'
765 * 'test'
766 * 'testproc'
767 *
768 * It will only change to 'platform' if the system
769 * supports it (as determined by having hibernation_ops).
770 */
771
772static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
773 char *buf)
774{
775 int i;
776 char *start = buf;
777
778 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
779 if (!hibernation_modes[i])
780 continue;
781 switch (i) {
782 case HIBERNATION_SHUTDOWN:
783 case HIBERNATION_REBOOT:
784 case HIBERNATION_TEST:
785 case HIBERNATION_TESTPROC:
786 break;
787 case HIBERNATION_PLATFORM:
788 if (hibernation_ops)
789 break;
790 /* not a valid mode, continue with loop */
791 continue;
792 }
793 if (i == hibernation_mode)
794 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
795 else
796 buf += sprintf(buf, "%s ", hibernation_modes[i]);
797 }
798 buf += sprintf(buf, "\n");
799 return buf-start;
800}
801
802
803static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
804 const char *buf, size_t n)
805{
806 int error = 0;
807 int i;
808 int len;
809 char *p;
810 int mode = HIBERNATION_INVALID;
811
812 p = memchr(buf, '\n', n);
813 len = p ? p - buf : n;
814
815 mutex_lock(&pm_mutex);
816 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
817 if (len == strlen(hibernation_modes[i])
818 && !strncmp(buf, hibernation_modes[i], len)) {
819 mode = i;
820 break;
821 }
822 }
823 if (mode != HIBERNATION_INVALID) {
824 switch (mode) {
825 case HIBERNATION_SHUTDOWN:
826 case HIBERNATION_REBOOT:
827 case HIBERNATION_TEST:
828 case HIBERNATION_TESTPROC:
829 hibernation_mode = mode;
830 break;
831 case HIBERNATION_PLATFORM:
832 if (hibernation_ops)
833 hibernation_mode = mode;
834 else
835 error = -EINVAL;
836 }
837 } else
838 error = -EINVAL;
839
840 if (!error)
841 pr_debug("PM: Hibernation mode set to '%s'\n",
842 hibernation_modes[mode]);
843 mutex_unlock(&pm_mutex);
844 return error ? error : n;
845}
846
847power_attr(disk);
848
849static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
850 char *buf)
851{
852 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
853 MINOR(swsusp_resume_device));
854}
855
856static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
857 const char *buf, size_t n)
858{
859 unsigned int maj, min;
860 dev_t res;
861 int ret = -EINVAL;
862
863 if (sscanf(buf, "%u:%u", &maj, &min) != 2)
864 goto out;
865
866 res = MKDEV(maj,min);
867 if (maj != MAJOR(res) || min != MINOR(res))
868 goto out;
869
870 mutex_lock(&pm_mutex);
871 swsusp_resume_device = res;
872 mutex_unlock(&pm_mutex);
873 printk(KERN_INFO "PM: Starting manual resume from disk\n");
874 noresume = 0;
875 software_resume();
876 ret = n;
877 out:
878 return ret;
879}
880
881power_attr(resume);
882
883static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
884 char *buf)
885{
886 return sprintf(buf, "%lu\n", image_size);
887}
888
889static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
890 const char *buf, size_t n)
891{
892 unsigned long size;
893
894 if (sscanf(buf, "%lu", &size) == 1) {
895 image_size = size;
896 return n;
897 }
898
899 return -EINVAL;
900}
901
902power_attr(image_size);
903
904static struct attribute * g[] = {
905 &disk_attr.attr,
906 &resume_attr.attr,
907 &image_size_attr.attr,
908 NULL,
909};
910
911
912static struct attribute_group attr_group = {
913 .attrs = g,
914};
915
916
917static int __init pm_disk_init(void)
918{
919 return sysfs_create_group(power_kobj, &attr_group);
920}
921
922core_initcall(pm_disk_init);
923
924
925static int __init resume_setup(char *str)
926{
927 if (noresume)
928 return 1;
929
930 strncpy( resume_file, str, 255 );
931 return 1;
932}
933
934static int __init resume_offset_setup(char *str)
935{
936 unsigned long long offset;
937
938 if (noresume)
939 return 1;
940
941 if (sscanf(str, "%llu", &offset) == 1)
942 swsusp_resume_block = offset;
943
944 return 1;
945}
946
947static int __init noresume_setup(char *str)
948{
949 noresume = 1;
950 return 1;
951}
952
953__setup("noresume", noresume_setup);
954__setup("resume_offset=", resume_offset_setup);
955__setup("resume=", resume_setup);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 02:22:02 -0500