[linux-2.6-block.git] / kernel / power / disk.c

/*
 * kernel/power/disk.c - Suspend-to-disk support.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
 *
 * This file is released under the GPLv2.
 *
 */

#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pm.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>

#include "power.h"


static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
sector_t swsusp_resume_block;

/**
 *	platform_prepare - prepare the machine for hibernation using the
 *	platform driver if so configured and return an error code if it fails
 */

static inline int platform_prepare(void)
{
	int error = 0;

	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->prepare)
			error = pm_ops->prepare(PM_SUSPEND_DISK);
	}
	return error;
}

/**
 *	power_down - Shut machine down for hibernate.
 *	@mode:		Suspend-to-disk mode
 *
 *	Use the platform driver, if configured so, and return gracefully if it
 *	fails.
 *	Otherwise, try to power off and reboot. If they fail, halt the machine,
 *	there ain't no turning back.
 */

static void power_down(suspend_disk_method_t mode)
{
	switch(mode) {
	case PM_DISK_PLATFORM:
		if (pm_ops && pm_ops->enter) {
			kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
			pm_ops->enter(PM_SUSPEND_DISK);
			break;
		}
	case PM_DISK_SHUTDOWN:
		kernel_power_off();
		break;
	case PM_DISK_REBOOT:
		kernel_restart(NULL);
		break;
	}
	kernel_halt();
	/* Valid image is on the disk, if we continue we risk serious data corruption
	   after resume. */
	printk(KERN_CRIT "Please power me down manually\n");
	while(1);
}

static inline void platform_finish(void)
{
	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->finish)
			pm_ops->finish(PM_SUSPEND_DISK);
	}
}

static void unprepare_processes(void)
{
	thaw_processes();
	pm_restore_console();
}

static int prepare_processes(void)
{
	int error = 0;

	pm_prepare_console();
	if (freeze_processes()) {
		error = -EBUSY;
		unprepare_processes();
	}
	return error;
}

/**
 *	pm_suspend_disk - The granpappy of hibernation power management.
 *
 *	If we're going through the firmware, then get it over with quickly.
 *
 *	If not, then call swsusp to do its thing, then figure out how
 *	to power down the system.
 */

int pm_suspend_disk(void)
{
	int error;

	error = prepare_processes();
	if (error)
		return error;

	if (pm_disk_mode == PM_DISK_TESTPROC) {
		printk("swsusp debug: Waiting for 5 seconds.\n");
		mdelay(5000);
		goto Thaw;
	}
	/* Free memory before shutting down devices. */
	error = swsusp_shrink_memory();
	if (error)
		goto Thaw;

	error = platform_prepare();
	if (error)
		goto Thaw;

	suspend_console();
	error = device_suspend(PMSG_FREEZE);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Resume_devices;
	}
	error = disable_nonboot_cpus();
	if (error)
		goto Enable_cpus;

	if (pm_disk_mode == PM_DISK_TEST) {
		printk("swsusp debug: Waiting for 5 seconds.\n");
		mdelay(5000);
		goto Enable_cpus;
	}

	pr_debug("PM: snapshotting memory.\n");
	in_suspend = 1;
	error = swsusp_suspend();
	if (error)
		goto Enable_cpus;

	if (in_suspend) {
		enable_nonboot_cpus();
		platform_finish();
		device_resume();
		resume_console();
		pr_debug("PM: writing image.\n");
		error = swsusp_write();
		if (!error)
			power_down(pm_disk_mode);
		else {
			swsusp_free();
			goto Thaw;
		}
	} else {
		pr_debug("PM: Image restored successfully.\n");
	}

	swsusp_free();
 Enable_cpus:
	enable_nonboot_cpus();
 Resume_devices:
	platform_finish();
	device_resume();
	resume_console();
 Thaw:
	unprepare_processes();
	return error;
}


/**
 *	software_resume - Resume from a saved image.
 *
 *	Called as a late_initcall (so all devices are discovered and
 *	initialized), we call swsusp to see if we have a saved image or not.
 *	If so, we quiesce devices, the restore the saved image. We will
 *	return above (in pm_suspend_disk() ) if everything goes well.
 *	Otherwise, we fail gracefully and return to the normally
 *	scheduled program.
 *
 */

static int software_resume(void)
{
	int error;

	mutex_lock(&pm_mutex);
	if (!swsusp_resume_device) {
		if (!strlen(resume_file)) {
			mutex_unlock(&pm_mutex);
			return -ENOENT;
		}
		swsusp_resume_device = name_to_dev_t(resume_file);
		pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	} else {
		pr_debug("swsusp: Resume From Partition %d:%d\n",
			 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	}

	if (noresume) {
		/**
		 * FIXME: If noresume is specified, we need to find the partition
		 * and reset it back to normal swap space.
		 */
		mutex_unlock(&pm_mutex);
		return 0;
	}

	pr_debug("PM: Checking swsusp image.\n");

	error = swsusp_check();
	if (error)
		goto Done;

	pr_debug("PM: Preparing processes for restore.\n");

	error = prepare_processes();
	if (error) {
		swsusp_close();
		goto Done;
	}

	error = platform_prepare();
	if (error) {
		swsusp_free();
		goto Thaw;
	}

	pr_debug("PM: Reading swsusp image.\n");

	error = swsusp_read();
	if (error) {
		swsusp_free();
		goto Thaw;
	}

	pr_debug("PM: Preparing devices for restore.\n");

	suspend_console();
	error = device_suspend(PMSG_PRETHAW);
	if (error)
		goto Free;

	error = disable_nonboot_cpus();
	if (!error)
		swsusp_resume();

	enable_nonboot_cpus();
 Free:
	swsusp_free();
	platform_finish();
	device_resume();
	resume_console();
 Thaw:
	printk(KERN_ERR "PM: Restore failed, recovering.\n");
	unprepare_processes();
 Done:
	/* For success case, the suspend path will release the lock */
	mutex_unlock(&pm_mutex);
	pr_debug("PM: Resume from disk failed.\n");
	return 0;
}

late_initcall(software_resume);


static const char * const pm_disk_modes[] = {
	[PM_DISK_FIRMWARE]	= "firmware",
	[PM_DISK_PLATFORM]	= "platform",
	[PM_DISK_SHUTDOWN]	= "shutdown",
	[PM_DISK_REBOOT]	= "reboot",
	[PM_DISK_TEST]		= "test",
	[PM_DISK_TESTPROC]	= "testproc",
};

/**
 *	disk - Control suspend-to-disk mode
 *
 *	Suspend-to-disk can be handled in several ways. The greatest
 *	distinction is who writes memory to disk - the firmware or the OS.
 *	If the firmware does it, we assume that it also handles suspending
 *	the system.
 *	If the OS does it, then we have three options for putting the system
 *	to sleep - using the platform driver (e.g. ACPI or other PM registers),
 *	powering off the system or rebooting the system (for testing).
 *
 *	The system will support either 'firmware' or 'platform', and that is
 *	known a priori (and encoded in pm_ops). But, the user may choose
 *	'shutdown' or 'reboot' as alternatives.
 *
 *	show() will display what the mode is currently set to.
 *	store() will accept one of
 *
 *	'firmware'
 *	'platform'
 *	'shutdown'
 *	'reboot'
 *
 *	It will only change to 'firmware' or 'platform' if the system
 *	supports it (as determined from pm_ops->pm_disk_mode).
 */

static ssize_t disk_show(struct subsystem * subsys, char * buf)
{
	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}


static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
{
	int error = 0;
	int i;
	int len;
	char *p;
	suspend_disk_method_t mode = 0;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	mutex_lock(&pm_mutex);
	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
		if (!strncmp(buf, pm_disk_modes[i], len)) {
			mode = i;
			break;
		}
	}
	if (mode) {
		if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
		     mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
			pm_disk_mode = mode;
		} else {
			if (pm_ops && pm_ops->enter &&
			    (mode == pm_ops->pm_disk_mode))
				pm_disk_mode = mode;
			else
				error = -EINVAL;
		}
	} else {
		error = -EINVAL;
	}

	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
		 pm_disk_modes[mode]);
	mutex_unlock(&pm_mutex);
	return error ? error : n;
}

power_attr(disk);

static ssize_t resume_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
		       MINOR(swsusp_resume_device));
}

static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n)
{
	unsigned int maj, min;
	dev_t res;
	int ret = -EINVAL;

	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
		goto out;

	res = MKDEV(maj,min);
	if (maj != MAJOR(res) || min != MINOR(res))
		goto out;

	mutex_lock(&pm_mutex);
	swsusp_resume_device = res;
	mutex_unlock(&pm_mutex);
	printk("Attempting manual resume\n");
	noresume = 0;
	software_resume();
	ret = n;
 out:
	return ret;
}

power_attr(resume);

static ssize_t image_size_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf, "%lu\n", image_size);
}

static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
{
	unsigned long size;

	if (sscanf(buf, "%lu", &size) == 1) {
		image_size = size;
		return n;
	}

	return -EINVAL;
}

power_attr(image_size);

static struct attribute * g[] = {
	&disk_attr.attr,
	&resume_attr.attr,
	&image_size_attr.attr,
	NULL,
};


static struct attribute_group attr_group = {
	.attrs = g,
};


static int __init pm_disk_init(void)
{
	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
}

core_initcall(pm_disk_init);


static int __init resume_setup(char *str)
{
	if (noresume)
		return 1;

	strncpy( resume_file, str, 255 );
	return 1;
}

static int __init resume_offset_setup(char *str)
{
	unsigned long long offset;

	if (noresume)
		return 1;

	if (sscanf(str, "%llu", &offset) == 1)
		swsusp_resume_block = offset;

	return 1;
}

static int __init noresume_setup(char *str)
{
	noresume = 1;
	return 1;
}

__setup("noresume", noresume_setup);
__setup("resume_offset=", resume_offset_setup);
__setup("resume=", resume_setup);
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
8a05aac2 SS	33	/**
	34	* platform_prepare - prepare the machine for hibernation using the
	35	* platform driver if so configured and return an error code if it fails
	36	*/
	37
	38	static inline int platform_prepare(void)
	39	{
	40	int error = 0;
	41
	42	if (pm_disk_mode == PM_DISK_PLATFORM) {
	43	if (pm_ops && pm_ops->prepare)
	44	error = pm_ops->prepare(PM_SUSPEND_DISK);
	45	}
	46	return error;
	47	}
	48
1da177e4 LT	49	/**
	50	* power_down - Shut machine down for hibernate.
	51	* @mode: Suspend-to-disk mode
	52	*
	53	* Use the platform driver, if configured so, and return gracefully if it
	54	* fails.
	55	* Otherwise, try to power off and reboot. If they fail, halt the machine,
	56	* there ain't no turning back.
	57	*/
	58
	59	static void power_down(suspend_disk_method_t mode)
	60	{
1da177e4 LT	61	switch(mode) {
1da177e4 LT	62	case PM_DISK_PLATFORM:
9185cfa9 RW	63	if (pm_ops && pm_ops->enter) {
9185cfa9 RW	64	kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
cfee47f9	65	pm_ops->enter(PM_SUSPEND_DISK);
9185cfa9 RW	66	break;
9185cfa9 RW	67	}
1da177e4	68	case PM_DISK_SHUTDOWN:
fdde86ac	69	kernel_power_off();
1da177e4 LT	70	break;
1da177e4 LT	71	case PM_DISK_REBOOT:
fdde86ac	72	kernel_restart(NULL);
1da177e4 LT	73	break;
1da177e4 LT	74	}
fdde86ac	75	kernel_halt();
1da177e4 LT	76	/* Valid image is on the disk, if we continue we risk serious data corruption
	77	after resume. */
	78	printk(KERN_CRIT "Please power me down manually\n");
	79	while(1);
	80	}
	81
1da177e4 LT	82	static inline void platform_finish(void)
	83	{
	84	if (pm_disk_mode == PM_DISK_PLATFORM) {
	85	if (pm_ops && pm_ops->finish)
	86	pm_ops->finish(PM_SUSPEND_DISK);
	87	}
	88	}
	89
ed746e3b RW	90	static void unprepare_processes(void)
	91	{
	92	thaw_processes();
	93	pm_restore_console();
	94	}
	95
1da177e4 LT	96	static int prepare_processes(void)
1da177e4 LT	97	{
b918f6e6	98	int error = 0;
1da177e4 LT	99
1da177e4 LT	100	pm_prepare_console();
1da177e4 LT	101	if (freeze_processes()) {
1da177e4 LT	102	error = -EBUSY;
ed746e3b	103	unprepare_processes();
1da177e4	104	}
5a72e04d	105	return error;
1da177e4 LT	106	}
1da177e4 LT	107
1da177e4	108	/**
f1cc0a89	109	* pm_suspend_disk - The granpappy of hibernation power management.
1da177e4 LT	110	*
	111	* If we're going through the firmware, then get it over with quickly.
	112	*
	113	* If not, then call swsusp to do its thing, then figure out how
	114	* to power down the system.
	115	*/
	116
	117	int pm_suspend_disk(void)
	118	{
	119	int error;
	120
	121	error = prepare_processes();
5a72e04d LS	122	if (error)
5a72e04d LS	123	return error;
1da177e4	124
ed746e3b RW	125	if (pm_disk_mode == PM_DISK_TESTPROC) {
	126	printk("swsusp debug: Waiting for 5 seconds.\n");
	127	mdelay(5000);
	128	goto Thaw;
	129	}
	130	/* Free memory before shutting down devices. */
	131	error = swsusp_shrink_memory();
	132	if (error)
	133	goto Thaw;
	134
	135	error = platform_prepare();
	136	if (error)
	137	goto Thaw;
b918f6e6	138
97c7801c	139	suspend_console();
99dc7d63	140	error = device_suspend(PMSG_FREEZE);
1da177e4	141	if (error) {
ed746e3b RW	142	printk(KERN_ERR "PM: Some devices failed to suspend\n");
ed746e3b RW	143	goto Resume_devices;
b918f6e6	144	}
ed746e3b RW	145	error = disable_nonboot_cpus();
	146	if (error)
	147	goto Enable_cpus;
b918f6e6 RW	148
	149	if (pm_disk_mode == PM_DISK_TEST) {
	150	printk("swsusp debug: Waiting for 5 seconds.\n");
	151	mdelay(5000);
ed746e3b	152	goto Enable_cpus;
1da177e4 LT	153	}
1da177e4 LT	154
1da177e4 LT	155	pr_debug("PM: snapshotting memory.\n");
1da177e4 LT	156	in_suspend = 1;
ed746e3b RW	157	error = swsusp_suspend();
	158	if (error)
	159	goto Enable_cpus;
1da177e4 LT	160
1da177e4 LT	161	if (in_suspend) {
ed746e3b RW	162	enable_nonboot_cpus();
ed746e3b RW	163	platform_finish();
0245b3e7	164	device_resume();
97c7801c	165	resume_console();
1da177e4	166	pr_debug("PM: writing image.\n");
f577eb30	167	error = swsusp_write();
1da177e4 LT	168	if (!error)
1da177e4 LT	169	power_down(pm_disk_mode);
99dc7d63	170	else {
99dc7d63	171	swsusp_free();
b918f6e6	172	goto Thaw;
99dc7d63	173	}
b918f6e6	174	} else {
1da177e4	175	pr_debug("PM: Image restored successfully.\n");
b918f6e6	176	}
99dc7d63	177
1da177e4	178	swsusp_free();
ed746e3b RW	179	Enable_cpus:
	180	enable_nonboot_cpus();
	181	Resume_devices:
	182	platform_finish();
99dc7d63	183	device_resume();
97c7801c	184	resume_console();
b918f6e6	185	Thaw:
99dc7d63	186	unprepare_processes();
1da177e4 LT	187	return error;
	188	}
	189
	190
	191	/**
	192	* software_resume - Resume from a saved image.
	193	*
	194	* Called as a late_initcall (so all devices are discovered and
	195	* initialized), we call swsusp to see if we have a saved image or not.
	196	* If so, we quiesce devices, the restore the saved image. We will
	197	* return above (in pm_suspend_disk() ) if everything goes well.
	198	* Otherwise, we fail gracefully and return to the normally
	199	* scheduled program.
	200	*
	201	*/
	202
	203	static int software_resume(void)
	204	{
	205	int error;
	206
a6d70980	207	mutex_lock(&pm_mutex);
3efa147a	208	if (!swsusp_resume_device) {
dd5d666b	209	if (!strlen(resume_file)) {
a6d70980	210	mutex_unlock(&pm_mutex);
3efa147a	211	return -ENOENT;
dd5d666b	212	}
3efa147a PM	213	swsusp_resume_device = name_to_dev_t(resume_file);
	214	pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	215	} else {
	216	pr_debug("swsusp: Resume From Partition %d:%d\n",
	217	MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	218	}
	219
1da177e4 LT	220	if (noresume) {
	221	/**
	222	* FIXME: If noresume is specified, we need to find the partition
	223	* and reset it back to normal swap space.
	224	*/
a6d70980	225	mutex_unlock(&pm_mutex);
1da177e4 LT	226	return 0;
	227	}
	228
	229	pr_debug("PM: Checking swsusp image.\n");
	230
ed746e3b RW	231	error = swsusp_check();
ed746e3b RW	232	if (error)
1da177e4 LT	233	goto Done;
	234
	235	pr_debug("PM: Preparing processes for restore.\n");
	236
ed746e3b RW	237	error = prepare_processes();
ed746e3b RW	238	if (error) {
1da177e4	239	swsusp_close();
5a72e04d	240	goto Done;
1da177e4 LT	241	}
1da177e4 LT	242
ed746e3b RW	243	error = platform_prepare();
	244	if (error) {
	245	swsusp_free();
	246	goto Thaw;
	247	}
	248
1da177e4 LT	249	pr_debug("PM: Reading swsusp image.\n");
1da177e4 LT	250
ed746e3b RW	251	error = swsusp_read();
ed746e3b RW	252	if (error) {
2c1b4a5c RW	253	swsusp_free();
	254	goto Thaw;
	255	}
1da177e4 LT	256
	257	pr_debug("PM: Preparing devices for restore.\n");
	258
97c7801c	259	suspend_console();
ed746e3b RW	260	error = device_suspend(PMSG_PRETHAW);
	261	if (error)
	262	goto Free;
1da177e4	263
ed746e3b RW	264	error = disable_nonboot_cpus();
	265	if (!error)
	266	swsusp_resume();
1da177e4	267
ed746e3b RW	268	enable_nonboot_cpus();
	269	Free:
	270	swsusp_free();
	271	platform_finish();
99dc7d63	272	device_resume();
97c7801c	273	resume_console();
2c1b4a5c	274	Thaw:
ed746e3b	275	printk(KERN_ERR "PM: Restore failed, recovering.\n");
1da177e4 LT	276	unprepare_processes();
1da177e4 LT	277	Done:
dd5d666b	278	/* For success case, the suspend path will release the lock */
a6d70980	279	mutex_unlock(&pm_mutex);
1da177e4 LT	280	pr_debug("PM: Resume from disk failed.\n");
	281	return 0;
	282	}
	283
	284	late_initcall(software_resume);
	285
	286
3b364b8d	287	static const char * const pm_disk_modes[] = {
1da177e4 LT	288	[PM_DISK_FIRMWARE] = "firmware",
	289	[PM_DISK_PLATFORM] = "platform",
	290	[PM_DISK_SHUTDOWN] = "shutdown",
	291	[PM_DISK_REBOOT] = "reboot",
b918f6e6 RW	292	[PM_DISK_TEST] = "test",
b918f6e6 RW	293	[PM_DISK_TESTPROC] = "testproc",
1da177e4 LT	294	};
	295
	296	/**
	297	* disk - Control suspend-to-disk mode
	298	*
	299	* Suspend-to-disk can be handled in several ways. The greatest
	300	* distinction is who writes memory to disk - the firmware or the OS.
	301	* If the firmware does it, we assume that it also handles suspending
	302	* the system.
	303	* If the OS does it, then we have three options for putting the system
	304	* to sleep - using the platform driver (e.g. ACPI or other PM registers),
	305	* powering off the system or rebooting the system (for testing).
	306	*
	307	* The system will support either 'firmware' or 'platform', and that is
	308	* known a priori (and encoded in pm_ops). But, the user may choose
	309	* 'shutdown' or 'reboot' as alternatives.
	310	*
	311	* show() will display what the mode is currently set to.
	312	* store() will accept one of
	313	*
	314	* 'firmware'
	315	* 'platform'
	316	* 'shutdown'
	317	* 'reboot'
	318	*
	319	* It will only change to 'firmware' or 'platform' if the system
	320	* supports it (as determined from pm_ops->pm_disk_mode).
	321	*/
	322
	323	static ssize_t disk_show(struct subsystem * subsys, char * buf)
	324	{
	325	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
	326	}
	327
	328
	329	static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
	330	{
	331	int error = 0;
	332	int i;
	333	int len;
	334	char *p;
	335	suspend_disk_method_t mode = 0;
	336
	337	p = memchr(buf, '\n', n);
	338	len = p ? p - buf : n;
	339
a6d70980	340	mutex_lock(&pm_mutex);
1da177e4 LT	341	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
	342	if (!strncmp(buf, pm_disk_modes[i], len)) {
	343	mode = i;
	344	break;
	345	}
	346	}
	347	if (mode) {
b918f6e6 RW	348	if (mode == PM_DISK_SHUTDOWN \|\| mode == PM_DISK_REBOOT \|\|
b918f6e6 RW	349	mode == PM_DISK_TEST \|\| mode == PM_DISK_TESTPROC) {
1da177e4	350	pm_disk_mode = mode;
b918f6e6	351	} else {
1da177e4 LT	352	if (pm_ops && pm_ops->enter &&
	353	(mode == pm_ops->pm_disk_mode))
	354	pm_disk_mode = mode;
	355	else
	356	error = -EINVAL;
	357	}
b918f6e6	358	} else {
1da177e4	359	error = -EINVAL;
b918f6e6	360	}
1da177e4 LT	361
	362	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
	363	pm_disk_modes[mode]);
a6d70980	364	mutex_unlock(&pm_mutex);
1da177e4 LT	365	return error ? error : n;
	366	}
	367
	368	power_attr(disk);
	369
	370	static ssize_t resume_show(struct subsystem * subsys, char *buf)
	371	{
	372	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
	373	MINOR(swsusp_resume_device));
	374	}
	375
a576219a	376	static ssize_t resume_store(struct subsystem subsys, const char buf, size_t n)
1da177e4	377	{
1da177e4	378	unsigned int maj, min;
1da177e4	379	dev_t res;
a576219a	380	int ret = -EINVAL;
1da177e4	381
a576219a AM	382	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
a576219a AM	383	goto out;
1da177e4	384
a576219a AM	385	res = MKDEV(maj,min);
	386	if (maj != MAJOR(res) \|\| min != MINOR(res))
	387	goto out;
1da177e4	388
a6d70980	389	mutex_lock(&pm_mutex);
a576219a	390	swsusp_resume_device = res;
a6d70980	391	mutex_unlock(&pm_mutex);
a576219a AM	392	printk("Attempting manual resume\n");
	393	noresume = 0;
	394	software_resume();
	395	ret = n;
59a49335	396	out:
a576219a	397	return ret;
1da177e4 LT	398	}
	399
	400	power_attr(resume);
	401
ca0aec0f RW	402	static ssize_t image_size_show(struct subsystem * subsys, char *buf)
ca0aec0f RW	403	{
853609b6	404	return sprintf(buf, "%lu\n", image_size);
ca0aec0f RW	405	}
	406
	407	static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
	408	{
853609b6	409	unsigned long size;
ca0aec0f	410
853609b6	411	if (sscanf(buf, "%lu", &size) == 1) {
ca0aec0f RW	412	image_size = size;
	413	return n;
	414	}
	415
	416	return -EINVAL;
	417	}
	418
	419	power_attr(image_size);
	420
1da177e4 LT	421	static struct attribute * g[] = {
	422	&disk_attr.attr,
	423	&resume_attr.attr,
ca0aec0f	424	&image_size_attr.attr,
1da177e4 LT	425	NULL,
	426	};
	427
	428
	429	static struct attribute_group attr_group = {
	430	.attrs = g,
	431	};
	432
	433
	434	static int __init pm_disk_init(void)
	435	{
	436	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
	437	}
	438
	439	core_initcall(pm_disk_init);
	440
	441
	442	static int __init resume_setup(char *str)
	443	{
	444	if (noresume)
	445	return 1;
	446
	447	strncpy( resume_file, str, 255 );
	448	return 1;
	449	}
	450
9a154d9d RW	451	static int __init resume_offset_setup(char *str)
	452	{
	453	unsigned long long offset;
	454
	455	if (noresume)
	456	return 1;
	457
	458	if (sscanf(str, "%llu", &offset) == 1)
	459	swsusp_resume_block = offset;
	460
	461	return 1;
	462	}
	463
1da177e4 LT	464	static int __init noresume_setup(char *str)
	465	{
	466	noresume = 1;
	467	return 1;
	468	}
	469
	470	__setup("noresume", noresume_setup);
9a154d9d	471	__setup("resume_offset=", resume_offset_setup);
1da177e4	472	__setup("resume=", resume_setup);