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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Rafael J. Wysocki1bfcf132008-10-15 22:01:21 -070017#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/delay.h>
19#include <linux/fs.h>
Andrew Mortond53d9f12005-07-12 13:58:07 -070020#include <linux/mount.h>
Eric W. Biederman88d10bb2005-09-22 21:43:46 -070021#include <linux/pm.h>
Rafael J. Wysocki97c78012006-10-11 01:20:45 -070022#include <linux/console.h>
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -070023#include <linux/cpu.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080024#include <linux/freezer.h>
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +020025#include <linux/ftrace.h>
Andrew Mortond53d9f12005-07-12 13:58:07 -070026
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "power.h"
28
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030static int noresume = 0;
Adrian Bunk47a460d2008-02-04 22:30:06 -080031static char resume_file[256] = CONFIG_PM_STD_PARTITION;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032dev_t swsusp_resume_device;
Rafael J. Wysocki9a154d92006-12-06 20:34:12 -080033sector_t swsusp_resume_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -070035enum {
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
48static int hibernation_mode = HIBERNATION_SHUTDOWN;
49
Rafael J. Wysockib3dac3b2007-10-18 03:04:43 -070050static struct platform_hibernation_ops *hibernation_ops;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -070051
52/**
53 * hibernation_set_ops - set the global hibernate operations
54 * @ops: the hibernation operations to use in subsequent hibernation transitions
55 */
56
Rafael J. Wysockib3dac3b2007-10-18 03:04:43 -070057void hibernation_set_ops(struct platform_hibernation_ops *ops)
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -070058{
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +010059 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
60 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -070061 && ops->restore_cleanup)) {
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -070062 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
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +010075#ifdef CONFIG_PM_DEBUG
76static void hibernation_debug_sleep(void)
77{
78 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
79 mdelay(5000);
80}
81
82static int hibernation_testmode(int mode)
83{
84 if (hibernation_mode == mode) {
85 hibernation_debug_sleep();
86 return 1;
87 }
88 return 0;
89}
90
91static 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 */
100static int hibernation_testmode(int mode) { return 0; }
101static int hibernation_test(int level) { return 0; }
102#endif /* !CONFIG_PM_DEBUG */
103
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700104/**
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100105 * platform_begin - tell the platform driver that we're starting
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700106 * hibernation
107 */
108
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100109static int platform_begin(int platform_mode)
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700110{
111 return (platform_mode && hibernation_ops) ?
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100112 hibernation_ops->begin() : 0;
113}
114
115/**
116 * platform_end - tell the platform driver that we've entered the
117 * working state
118 */
119
120static void platform_end(int platform_mode)
121{
122 if (platform_mode && hibernation_ops)
123 hibernation_ops->end();
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700124}
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/**
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700127 * platform_pre_snapshot - prepare the machine for hibernation using the
Stefan Seyfried8a05aac2006-12-06 20:34:21 -0800128 * platform driver if so configured and return an error code if it fails
129 */
130
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700131static int platform_pre_snapshot(int platform_mode)
Stefan Seyfried8a05aac2006-12-06 20:34:21 -0800132{
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700133 return (platform_mode && hibernation_ops) ?
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700134 hibernation_ops->pre_snapshot() : 0;
Stefan Seyfried8a05aac2006-12-06 20:34:21 -0800135}
136
137/**
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700138 * platform_leave - prepare the machine for switching to the normal mode
139 * of operation using the platform driver (called with interrupts disabled)
140 */
141
142static void platform_leave(int platform_mode)
143{
144 if (platform_mode && hibernation_ops)
145 hibernation_ops->leave();
146}
147
148/**
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700149 * platform_finish - switch the machine to the normal mode of operation
150 * using the platform driver (must be called after platform_prepare())
151 */
152
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700153static void platform_finish(int platform_mode)
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700154{
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700155 if (platform_mode && hibernation_ops)
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700156 hibernation_ops->finish();
157}
158
159/**
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700160 * 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
165static 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
178static void platform_restore_cleanup(int platform_mode)
179{
180 if (platform_mode && hibernation_ops)
181 hibernation_ops->restore_cleanup();
182}
183
184/**
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200185 * platform_recover - recover the platform from a failure to suspend
186 * devices.
187 */
188
189static void platform_recover(int platform_mode)
190{
191 if (platform_mode && hibernation_ops && hibernation_ops->recover)
192 hibernation_ops->recover();
193}
194
195/**
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700196 * 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
Adrian Bunk47a460d2008-02-04 22:30:06 -0800201static int create_image(int platform_mode)
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700202{
203 int error;
204
205 error = arch_prepare_suspend();
206 if (error)
207 return error;
208
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200209 device_pm_lock();
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700210 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) {
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100219 printk(KERN_ERR "PM: Some devices failed to power down, "
220 "aborting hibernation\n");
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700221 goto Enable_irqs;
222 }
223
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100224 if (hibernation_test(TEST_CORE))
225 goto Power_up;
226
227 in_suspend = 1;
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700228 save_processor_state();
229 error = swsusp_arch_suspend();
230 if (error)
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100231 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
232 error);
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700233 /* Restore control flow magically appears here */
234 restore_processor_state();
235 if (!in_suspend)
236 platform_leave(platform_mode);
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100237 Power_up:
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700238 /* NOTE: device_power_up() is just a resume() for devices
239 * that suspended with irqs off ... no overall powerup.
240 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200241 device_power_up(in_suspend ?
242 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700243 Enable_irqs:
244 local_irq_enable();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200245 device_pm_unlock();
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700246 return error;
247}
248
249/**
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700250 * 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
258int hibernation_snapshot(int platform_mode)
259{
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200260 int error, ftrace_save;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700261
262 /* Free memory before shutting down devices. */
263 error = swsusp_shrink_memory();
264 if (error)
Rafael J. Wysocki10a18032007-07-19 01:47:31 -0700265 return error;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700266
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100267 error = platform_begin(platform_mode);
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700268 if (error)
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100269 goto Close;
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700270
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700271 suspend_console();
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200272 ftrace_save = __ftrace_enabled_save();
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700273 error = device_suspend(PMSG_FREEZE);
274 if (error)
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200275 goto Recover_platform;
Rafael J. Wysocki10a18032007-07-19 01:47:31 -0700276
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100277 if (hibernation_test(TEST_DEVICES))
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200278 goto Recover_platform;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700279
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100280 error = platform_pre_snapshot(platform_mode);
281 if (error || hibernation_test(TEST_PLATFORM))
282 goto Finish;
283
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700284 error = disable_nonboot_cpus();
285 if (!error) {
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100286 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 */
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700294 }
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100295 Enable_cpus:
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700296 enable_nonboot_cpus();
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100297 Finish:
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700298 platform_finish(platform_mode);
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100299 Resume_devices:
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200300 device_resume(in_suspend ?
301 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200302 __ftrace_enabled_restore(ftrace_save);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700303 resume_console();
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100304 Close:
305 platform_end(platform_mode);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700306 return error;
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200307
308 Recover_platform:
309 platform_recover(platform_mode);
310 goto Resume_devices;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700311}
312
313/**
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100314 * 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
321static int resume_target_kernel(void)
322{
323 int error;
324
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200325 device_pm_lock();
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100326 local_irq_disable();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200327 error = device_power_down(PMSG_QUIESCE);
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100328 if (error) {
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100329 printk(KERN_ERR "PM: Some devices failed to power down, "
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100330 "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();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200355 device_power_up(PMSG_RECOVER);
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100356 Enable_irqs:
357 local_irq_enable();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200358 device_pm_unlock();
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100359 return error;
360}
361
362/**
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700363 * hibernation_restore - quiesce devices and restore the hibernation
364 * snapshot image. If successful, control returns in hibernation_snaphot()
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700365 * @platform_mode - if set, use the platform driver, if available, to
366 * prepare the platform frimware for the transition.
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700367 *
368 * Must be called with pm_mutex held
369 */
370
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700371int hibernation_restore(int platform_mode)
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700372{
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200373 int error, ftrace_save;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700374
375 pm_prepare_console();
376 suspend_console();
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200377 ftrace_save = __ftrace_enabled_save();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200378 error = device_suspend(PMSG_QUIESCE);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700379 if (error)
380 goto Finish;
381
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700382 error = platform_pre_restore(platform_mode);
383 if (!error) {
384 error = disable_nonboot_cpus();
385 if (!error)
Rafael J. Wysocki72df68c2007-12-08 02:04:21 +0100386 error = resume_target_kernel();
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700387 enable_nonboot_cpus();
388 }
389 platform_restore_cleanup(platform_mode);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200390 device_resume(PMSG_RECOVER);
Rafael J. Wysocki10a18032007-07-19 01:47:31 -0700391 Finish:
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200392 __ftrace_enabled_restore(ftrace_save);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700393 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
403int hibernation_platform_enter(void)
404{
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200405 int error, ftrace_save;
Rafael J. Wysockib1457bc2007-07-19 01:47:31 -0700406
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700407 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 */
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100415 error = hibernation_ops->begin();
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700416 if (error)
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100417 goto Close;
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700418
419 suspend_console();
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200420 ftrace_save = __ftrace_enabled_save();
Rafael J. Wysocki3a2d5b72008-02-23 19:13:25 +0100421 error = device_suspend(PMSG_HIBERNATE);
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200422 if (error) {
423 if (hibernation_ops->recover)
424 hibernation_ops->recover();
425 goto Resume_devices;
426 }
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700427
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
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200436 device_pm_lock();
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700437 local_irq_disable();
Rafael J. Wysocki3a2d5b72008-02-23 19:13:25 +0100438 error = device_power_down(PMSG_HIBERNATE);
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700439 if (!error) {
440 hibernation_ops->enter();
441 /* We should never get here */
442 while (1);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700443 }
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700444 local_irq_enable();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200445 device_pm_unlock();
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700446
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:
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200454 device_resume(PMSG_RESTORE);
Rafael J. Wysocki41108eb2008-08-28 14:39:12 +0200455 __ftrace_enabled_restore(ftrace_save);
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700456 resume_console();
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100457 Close:
458 hibernation_ops->end();
Rafael J. Wysockib1457bc2007-07-19 01:47:31 -0700459 return error;
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700460}
461
462/**
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700463 * power_down - Shut the machine down for hibernation.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 *
Johannes Bergfe0c9352007-04-30 15:09:51 -0700465 * Use the platform driver, if configured so; otherwise try
466 * to power off or reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 */
468
Johannes Bergfe0c9352007-04-30 15:09:51 -0700469static void power_down(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700471 switch (hibernation_mode) {
472 case HIBERNATION_TEST:
473 case HIBERNATION_TESTPROC:
Johannes Bergfe0c9352007-04-30 15:09:51 -0700474 break;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700475 case HIBERNATION_REBOOT:
Eric W. Biedermanfdde86a2005-07-26 12:01:17 -0600476 kernel_restart(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 break;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700478 case HIBERNATION_PLATFORM:
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700479 hibernation_platform_enter();
Rafael J. Wysocki9cd9a002007-10-18 03:04:56 -0700480 case HIBERNATION_SHUTDOWN:
481 kernel_power_off();
482 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
Eric W. Biedermanfdde86a2005-07-26 12:01:17 -0600484 kernel_halt();
Johannes Bergfe0c9352007-04-30 15:09:51 -0700485 /*
486 * Valid image is on the disk, if we continue we risk serious data
487 * corruption after resume.
488 */
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100489 printk(KERN_CRIT "PM: Please power down manually\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 while(1);
491}
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493static int prepare_processes(void)
494{
Rafael J. Wysockib918f6e2006-11-02 22:07:19 -0800495 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 if (freeze_processes()) {
498 error = -EBUSY;
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100499 thaw_processes();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
Li Shaohua5a72e042005-06-25 14:55:06 -0700501 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504/**
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700505 * hibernate - The granpappy of the built-in hibernation management
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 */
507
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700508int hibernate(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
510 int error;
511
Rafael J. Wysockib10d9112007-07-19 01:47:36 -0700512 mutex_lock(&pm_mutex);
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700513 /* The snapshot device should not be opened while we're running */
Rafael J. Wysockib10d9112007-07-19 01:47:36 -0700514 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
515 error = -EBUSY;
516 goto Unlock;
517 }
518
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100519 pm_prepare_console();
Rafael J. Wysockib10d9112007-07-19 01:47:36 -0700520 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
521 if (error)
522 goto Exit;
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700523
Rafael J. Wysocki1bfcf132008-10-15 22:01:21 -0700524 error = usermodehelper_disable();
525 if (error)
526 goto Exit;
527
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700528 /* Allocate memory management structures */
529 error = create_basic_memory_bitmaps();
530 if (error)
531 goto Exit;
532
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100533 printk(KERN_INFO "PM: Syncing filesystems ... ");
Rafael J. Wysocki232b1432007-10-18 03:04:44 -0700534 sys_sync();
535 printk("done.\n");
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 error = prepare_processes();
Li Shaohua5a72e042005-06-25 14:55:06 -0700538 if (error)
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700539 goto Finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100541 if (hibernation_test(TEST_FREEZER))
Rafael J. Wysockied746e32007-02-10 01:43:32 -0800542 goto Thaw;
Rafael J. Wysocki4cc79772007-11-19 23:42:31 +0100543
544 if (hibernation_testmode(HIBERNATION_TESTPROC))
545 goto Thaw;
546
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700547 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
548 if (in_suspend && !error) {
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700549 unsigned int flags = 0;
550
551 if (hibernation_mode == HIBERNATION_PLATFORM)
552 flags |= SF_PLATFORM_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 pr_debug("PM: writing image.\n");
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700554 error = swsusp_write(flags);
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700555 swsusp_free();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 if (!error)
Johannes Bergfe0c9352007-04-30 15:09:51 -0700557 power_down();
Rafael J. Wysockib918f6e2006-11-02 22:07:19 -0800558 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 pr_debug("PM: Image restored successfully.\n");
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700560 swsusp_free();
Rafael J. Wysockib918f6e2006-11-02 22:07:19 -0800561 }
Rafael J. Wysockib918f6e2006-11-02 22:07:19 -0800562 Thaw:
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100563 thaw_processes();
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700564 Finish:
565 free_basic_memory_bitmaps();
Rafael J. Wysocki1bfcf132008-10-15 22:01:21 -0700566 usermodehelper_enable();
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700567 Exit:
Rafael J. Wysockib10d9112007-07-19 01:47:36 -0700568 pm_notifier_call_chain(PM_POST_HIBERNATION);
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100569 pm_restore_console();
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700570 atomic_inc(&snapshot_device_available);
Rafael J. Wysockib10d9112007-07-19 01:47:36 -0700571 Unlock:
572 mutex_unlock(&pm_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 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
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700583 * return above (in hibernate() ) if everything goes well.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 * Otherwise, we fail gracefully and return to the normally
585 * scheduled program.
586 *
587 */
588
589static int software_resume(void)
590{
591 int error;
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700592 unsigned int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Johannes Berg60a0d232007-11-14 17:00:16 -0800594 /*
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);
Pavel Machek3efa1472005-07-07 17:56:43 -0700605 if (!swsusp_resume_device) {
Shaohua Lidd5d6662005-09-03 15:57:04 -0700606 if (!strlen(resume_file)) {
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800607 mutex_unlock(&pm_mutex);
Pavel Machek3efa1472005-07-07 17:56:43 -0700608 return -ENOENT;
Shaohua Lidd5d6662005-09-03 15:57:04 -0700609 }
Pavel Machek3efa1472005-07-07 17:56:43 -0700610 swsusp_resume_device = name_to_dev_t(resume_file);
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100611 pr_debug("PM: Resume from partition %s\n", resume_file);
Pavel Machek3efa1472005-07-07 17:56:43 -0700612 } else {
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100613 pr_debug("PM: Resume from partition %d:%d\n",
614 MAJOR(swsusp_resume_device),
615 MINOR(swsusp_resume_device));
Pavel Machek3efa1472005-07-07 17:56:43 -0700616 }
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (noresume) {
619 /**
Rafael J. Wysocki95758092007-12-08 02:06:57 +0100620 * FIXME: If noresume is specified, we need to find the
621 * partition and reset it back to normal swap space.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 */
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800623 mutex_unlock(&pm_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return 0;
625 }
626
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100627 pr_debug("PM: Checking hibernation image.\n");
Rafael J. Wysockied746e32007-02-10 01:43:32 -0800628 error = swsusp_check();
629 if (error)
Rafael J. Wysocki74dfd662007-05-06 14:50:43 -0700630 goto Unlock;
631
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700632 /* 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
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100638 pm_prepare_console();
Alan Sternc3e94d82007-11-19 23:38:25 +0100639 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
640 if (error)
641 goto Finish;
642
Rafael J. Wysocki1bfcf132008-10-15 22:01:21 -0700643 error = usermodehelper_disable();
644 if (error)
645 goto Finish;
646
Rafael J. Wysocki74dfd662007-05-06 14:50:43 -0700647 error = create_basic_memory_bitmaps();
648 if (error)
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700649 goto Finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
651 pr_debug("PM: Preparing processes for restore.\n");
Rafael J. Wysockied746e32007-02-10 01:43:32 -0800652 error = prepare_processes();
653 if (error) {
Al Viroc2dd0da2007-10-08 13:21:10 -0400654 swsusp_close(FMODE_READ);
Li Shaohua5a72e042005-06-25 14:55:06 -0700655 goto Done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 }
657
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100658 pr_debug("PM: Reading hibernation image.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700660 error = swsusp_read(&flags);
Rafael J. Wysockied746e32007-02-10 01:43:32 -0800661 if (!error)
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700662 hibernation_restore(flags & SF_PLATFORM_MODE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Rafael J. Wysockied746e32007-02-10 01:43:32 -0800664 printk(KERN_ERR "PM: Restore failed, recovering.\n");
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700665 swsusp_free();
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100666 thaw_processes();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 Done:
Rafael J. Wysocki74dfd662007-05-06 14:50:43 -0700668 free_basic_memory_bitmaps();
Rafael J. Wysocki1bfcf132008-10-15 22:01:21 -0700669 usermodehelper_enable();
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700670 Finish:
Alan Sternc3e94d82007-11-19 23:38:25 +0100671 pm_notifier_call_chain(PM_POST_RESTORE);
Rafael J. Wysocki5a0a2f32008-01-11 01:25:21 +0100672 pm_restore_console();
Rafael J. Wysocki0709db62007-05-06 14:50:45 -0700673 atomic_inc(&snapshot_device_available);
Shaohua Lidd5d6662005-09-03 15:57:04 -0700674 /* For success case, the suspend path will release the lock */
Rafael J. Wysocki74dfd662007-05-06 14:50:43 -0700675 Unlock:
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800676 mutex_unlock(&pm_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 pr_debug("PM: Resume from disk failed.\n");
Rafael J. Wysocki7777fab2007-07-19 01:47:29 -0700678 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
680
681late_initcall(software_resume);
682
683
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700684static 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",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690};
691
692/**
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700693 * disk - Control hibernation mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 *
Johannes Berg11d77d02007-04-30 15:09:53 -0700695 * 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
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700697 * or other hibernation_ops), powering off the system or rebooting the
698 * system (for testing) as well as the two test modes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 *
Johannes Berg11d77d02007-04-30 15:09:53 -0700700 * The system can support 'platform', and that is known a priori (and
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700701 * 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'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 *
705 * show() will display what the mode is currently set to.
706 * store() will accept one of
707 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 * 'platform'
709 * 'shutdown'
710 * 'reboot'
Johannes Berg11d77d02007-04-30 15:09:53 -0700711 * 'test'
712 * 'testproc'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 *
Johannes Berg11d77d02007-04-30 15:09:53 -0700714 * It will only change to 'platform' if the system
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700715 * supports it (as determined by having hibernation_ops).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 */
717
Kay Sievers386f2752007-11-02 13:47:53 +0100718static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
719 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700721 int i;
722 char *start = buf;
723
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700724 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
725 if (!hibernation_modes[i])
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700726 continue;
727 switch (i) {
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700728 case HIBERNATION_SHUTDOWN:
729 case HIBERNATION_REBOOT:
730 case HIBERNATION_TEST:
731 case HIBERNATION_TESTPROC:
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700732 break;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700733 case HIBERNATION_PLATFORM:
734 if (hibernation_ops)
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700735 break;
736 /* not a valid mode, continue with loop */
737 continue;
738 }
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700739 if (i == hibernation_mode)
740 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700741 else
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700742 buf += sprintf(buf, "%s ", hibernation_modes[i]);
Johannes Bergf0ced9b2007-05-06 14:50:50 -0700743 }
744 buf += sprintf(buf, "\n");
745 return buf-start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746}
747
748
Kay Sievers386f2752007-11-02 13:47:53 +0100749static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
750 const char *buf, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
752 int error = 0;
753 int i;
754 int len;
755 char *p;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700756 int mode = HIBERNATION_INVALID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 p = memchr(buf, '\n', n);
759 len = p ? p - buf : n;
760
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800761 mutex_lock(&pm_mutex);
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700762 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
Rafael J. Wysocki8d98a692007-05-16 22:11:19 -0700763 if (len == strlen(hibernation_modes[i])
764 && !strncmp(buf, hibernation_modes[i], len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 mode = i;
766 break;
767 }
768 }
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700769 if (mode != HIBERNATION_INVALID) {
Johannes Bergfe0c9352007-04-30 15:09:51 -0700770 switch (mode) {
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700771 case HIBERNATION_SHUTDOWN:
772 case HIBERNATION_REBOOT:
773 case HIBERNATION_TEST:
774 case HIBERNATION_TESTPROC:
775 hibernation_mode = mode;
Johannes Bergfe0c9352007-04-30 15:09:51 -0700776 break;
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700777 case HIBERNATION_PLATFORM:
778 if (hibernation_ops)
779 hibernation_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 else
781 error = -EINVAL;
782 }
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700783 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 error = -EINVAL;
785
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700786 if (!error)
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100787 pr_debug("PM: Hibernation mode set to '%s'\n",
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700788 hibernation_modes[mode]);
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800789 mutex_unlock(&pm_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 return error ? error : n;
791}
792
793power_attr(disk);
794
Kay Sievers386f2752007-11-02 13:47:53 +0100795static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
796 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
798 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
799 MINOR(swsusp_resume_device));
800}
801
Kay Sievers386f2752007-11-02 13:47:53 +0100802static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
803 const char *buf, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 unsigned int maj, min;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 dev_t res;
Andrew Mortona5762192006-01-06 00:09:50 -0800807 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Andrew Mortona5762192006-01-06 00:09:50 -0800809 if (sscanf(buf, "%u:%u", &maj, &min) != 2)
810 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Andrew Mortona5762192006-01-06 00:09:50 -0800812 res = MKDEV(maj,min);
813 if (maj != MAJOR(res) || min != MINOR(res))
814 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800816 mutex_lock(&pm_mutex);
Andrew Mortona5762192006-01-06 00:09:50 -0800817 swsusp_resume_device = res;
Stephen Hemmingera6d70982006-12-06 20:34:35 -0800818 mutex_unlock(&pm_mutex);
Rafael J. Wysocki23976722007-12-08 02:09:43 +0100819 printk(KERN_INFO "PM: Starting manual resume from disk\n");
Andrew Mortona5762192006-01-06 00:09:50 -0800820 noresume = 0;
821 software_resume();
822 ret = n;
Rafael J. Wysocki59a493352006-12-06 20:34:44 -0800823 out:
Andrew Mortona5762192006-01-06 00:09:50 -0800824 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825}
826
827power_attr(resume);
828
Kay Sievers386f2752007-11-02 13:47:53 +0100829static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
830 char *buf)
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800831{
Rafael J. Wysocki853609b2006-02-01 03:05:07 -0800832 return sprintf(buf, "%lu\n", image_size);
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800833}
834
Kay Sievers386f2752007-11-02 13:47:53 +0100835static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
836 const char *buf, size_t n)
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800837{
Rafael J. Wysocki853609b2006-02-01 03:05:07 -0800838 unsigned long size;
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800839
Rafael J. Wysocki853609b2006-02-01 03:05:07 -0800840 if (sscanf(buf, "%lu", &size) == 1) {
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800841 image_size = size;
842 return n;
843 }
844
845 return -EINVAL;
846}
847
848power_attr(image_size);
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850static struct attribute * g[] = {
851 &disk_attr.attr,
852 &resume_attr.attr,
Rafael J. Wysockica0aec02006-01-06 00:15:56 -0800853 &image_size_attr.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 NULL,
855};
856
857
858static struct attribute_group attr_group = {
859 .attrs = g,
860};
861
862
863static int __init pm_disk_init(void)
864{
Greg Kroah-Hartmand76e15f2007-11-27 11:28:26 -0800865 return sysfs_create_group(power_kobj, &attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866}
867
868core_initcall(pm_disk_init);
869
870
871static 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
Rafael J. Wysocki9a154d92006-12-06 20:34:12 -0800880static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893static int __init noresume_setup(char *str)
894{
895 noresume = 1;
896 return 1;
897}
898
899__setup("noresume", noresume_setup);
Rafael J. Wysocki9a154d92006-12-06 20:34:12 -0800900__setup("resume_offset=", resume_offset_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901__setup("resume=", resume_setup);