[linux-2.6-block.git] / kernel / power / power.h

/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/suspend.h>
#include <linux/suspend_ioctls.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
#include <linux/compiler.h>
#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/crypto.h>

struct swsusp_info {
	struct new_utsname	uts;
	u32			version_code;
	unsigned long		num_physpages;
	int			cpus;
	unsigned long		image_pages;
	unsigned long		pages;
	unsigned long		size;
} __aligned(PAGE_SIZE);

#ifdef CONFIG_HIBERNATION
/* kernel/power/snapshot.c */
extern void __init hibernate_reserved_size_init(void);
extern void __init hibernate_image_size_init(void);

#ifdef CONFIG_ARCH_HIBERNATION_HEADER
/* Maximum size of architecture specific data in a hibernation header */
#define MAX_ARCH_HEADER_SIZE	(sizeof(struct new_utsname) + 4)

static inline int init_header_complete(struct swsusp_info *info)
{
	return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
}

static inline const char *check_image_kernel(struct swsusp_info *info)
{
	return arch_hibernation_header_restore(info) ?
			"architecture specific data" : NULL;
}
#endif /* CONFIG_ARCH_HIBERNATION_HEADER */

/*
 * Keep some memory free so that I/O operations can succeed without paging
 * [Might this be more than 4 MB?]
 */
#define PAGES_FOR_IO	((4096 * 1024) >> PAGE_SHIFT)

/*
 * Keep 1 MB of memory free so that device drivers can allocate some pages in
 * their .suspend() routines without breaking the suspend to disk.
 */
#define SPARE_PAGES	((1024 * 1024) >> PAGE_SHIFT)

asmlinkage int swsusp_save(void);

/* kernel/power/hibernate.c */
extern bool freezer_test_done;
extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME];

/* kernel/power/swap.c */
extern unsigned int swsusp_header_flags;

extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);

#ifdef CONFIG_STRICT_KERNEL_RWX
/* kernel/power/snapshot.c */
extern void enable_restore_image_protection(void);
#else
static inline void enable_restore_image_protection(void) {}
#endif /* CONFIG_STRICT_KERNEL_RWX */

#else /* !CONFIG_HIBERNATION */

static inline void hibernate_reserved_size_init(void) {}
static inline void hibernate_image_size_init(void) {}
#endif /* !CONFIG_HIBERNATION */

#define power_attr(_name) \
static struct kobj_attribute _name##_attr = {	\
	.attr	= {				\
		.name = __stringify(_name),	\
		.mode = 0644,			\
	},					\
	.show	= _name##_show,			\
	.store	= _name##_store,		\
}

#define power_attr_ro(_name) \
static struct kobj_attribute _name##_attr = {	\
	.attr	= {				\
		.name = __stringify(_name),	\
		.mode = S_IRUGO,		\
	},					\
	.show	= _name##_show,			\
}

/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
extern unsigned long reserved_size;
extern int in_suspend;
extern dev_t swsusp_resume_device;
extern sector_t swsusp_resume_block;

extern int create_basic_memory_bitmaps(void);
extern void free_basic_memory_bitmaps(void);
extern int hibernate_preallocate_memory(void);

extern void clear_or_poison_free_pages(void);

/**
 *	Auxiliary structure used for reading the snapshot image data and
 *	metadata from and writing them to the list of page backup entries
 *	(PBEs) which is the main data structure of swsusp.
 *
 *	Using struct snapshot_handle we can transfer the image, including its
 *	metadata, as a continuous sequence of bytes with the help of
 *	snapshot_read_next() and snapshot_write_next().
 *
 *	The code that writes the image to a storage or transfers it to
 *	the user land is required to use snapshot_read_next() for this
 *	purpose and it should not make any assumptions regarding the internal
 *	structure of the image.  Similarly, the code that reads the image from
 *	a storage or transfers it from the user land is required to use
 *	snapshot_write_next().
 *
 *	This may allow us to change the internal structure of the image
 *	in the future with considerably less effort.
 */

struct snapshot_handle {
	unsigned int	cur;	/* number of the block of PAGE_SIZE bytes the
				 * next operation will refer to (ie. current)
				 */
	void		*buffer;	/* address of the block to read from
					 * or write to
					 */
	int		sync_read;	/* Set to one to notify the caller of
					 * snapshot_write_next() that it may
					 * need to call wait_on_bio_chain()
					 */
};

/* This macro returns the address from/to which the caller of
 * snapshot_read_next()/snapshot_write_next() is allowed to
 * read/write data after the function returns
 */
#define data_of(handle)	((handle).buffer)

extern unsigned int snapshot_additional_pages(struct zone *zone);
extern unsigned long snapshot_get_image_size(void);
extern int snapshot_read_next(struct snapshot_handle *handle);
extern int snapshot_write_next(struct snapshot_handle *handle);
int snapshot_write_finalize(struct snapshot_handle *handle);
extern int snapshot_image_loaded(struct snapshot_handle *handle);

extern bool hibernate_acquire(void);
extern void hibernate_release(void);

extern sector_t alloc_swapdev_block(int swap);
extern void free_all_swap_pages(int swap);
extern int swsusp_swap_in_use(void);

/*
 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 * the image header.
 */
#define SF_COMPRESSION_ALG_LZO	0 /* dummy, details given  below */
#define SF_PLATFORM_MODE	1
#define SF_NOCOMPRESS_MODE	2
#define SF_CRC32_MODE	        4
#define SF_HW_SIG		8

/*
 * Bit to indicate the compression algorithm to be used(for LZ4). The same
 * could be checked while saving/loading image to/from disk to use the
 * corresponding algorithms.
 *
 * By default, LZO compression is enabled if SF_CRC32_MODE is set. Use
 * SF_COMPRESSION_ALG_LZ4 to override this behaviour and use LZ4.
 *
 * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZO(dummy) -> Compression, LZO
 * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZ4 -> Compression, LZ4
 */
#define SF_COMPRESSION_ALG_LZ4	16

/* kernel/power/hibernate.c */
int swsusp_check(bool exclusive);
extern void swsusp_free(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);
void swsusp_close(void);
#ifdef CONFIG_SUSPEND
extern int swsusp_unmark(void);
#else
static inline int swsusp_unmark(void) { return 0; }
#endif

struct __kernel_old_timeval;
/* kernel/power/swsusp.c */
extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);

#ifdef CONFIG_SUSPEND
/* kernel/power/suspend.c */
extern const char * const pm_labels[];
extern const char *pm_states[];
extern const char *mem_sleep_states[];

extern int suspend_devices_and_enter(suspend_state_t state);
#else /* !CONFIG_SUSPEND */
#define mem_sleep_current	PM_SUSPEND_ON

static inline int suspend_devices_and_enter(suspend_state_t state)
{
	return -ENOSYS;
}
#endif /* !CONFIG_SUSPEND */

#ifdef CONFIG_PM_TEST_SUSPEND
/* kernel/power/suspend_test.c */
extern void suspend_test_start(void);
extern void suspend_test_finish(const char *label);
#else /* !CONFIG_PM_TEST_SUSPEND */
static inline void suspend_test_start(void) {}
static inline void suspend_test_finish(const char *label) {}
#endif /* !CONFIG_PM_TEST_SUSPEND */

#ifdef CONFIG_PM_SLEEP
/* kernel/power/main.c */
extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
extern int pm_notifier_call_chain(unsigned long val);
void pm_restrict_gfp_mask(void);
void pm_restore_gfp_mask(void);
#else
static inline void pm_restrict_gfp_mask(void) {}
static inline void pm_restore_gfp_mask(void) {}
#endif

#ifdef CONFIG_HIGHMEM
int restore_highmem(void);
#else
static inline unsigned int count_highmem_pages(void) { return 0; }
static inline int restore_highmem(void) { return 0; }
#endif

/*
 * Suspend test levels
 */
enum {
	/* keep first */
	TEST_NONE,
	TEST_CORE,
	TEST_CPUS,
	TEST_PLATFORM,
	TEST_DEVICES,
	TEST_FREEZER,
	/* keep last */
	__TEST_AFTER_LAST
};

#define TEST_FIRST	TEST_NONE
#define TEST_MAX	(__TEST_AFTER_LAST - 1)

#ifdef CONFIG_PM_SLEEP_DEBUG
extern int pm_test_level;
#else
#define pm_test_level	(TEST_NONE)
#endif

#ifdef CONFIG_SUSPEND_FREEZER
static inline int suspend_freeze_processes(void)
{
	int error;

	error = freeze_processes();
	/*
	 * freeze_processes() automatically thaws every task if freezing
	 * fails. So we need not do anything extra upon error.
	 */
	if (error)
		return error;

	error = freeze_kernel_threads();
	/*
	 * freeze_kernel_threads() thaws only kernel threads upon freezing
	 * failure. So we have to thaw the userspace tasks ourselves.
	 */
	if (error)
		thaw_processes();

	return error;
}

static inline void suspend_thaw_processes(void)
{
	thaw_processes();
}
#else
static inline int suspend_freeze_processes(void)
{
	return 0;
}

static inline void suspend_thaw_processes(void)
{
}
#endif

#ifdef CONFIG_PM_AUTOSLEEP

/* kernel/power/autosleep.c */
extern int pm_autosleep_init(void);
extern int pm_autosleep_lock(void);
extern void pm_autosleep_unlock(void);
extern suspend_state_t pm_autosleep_state(void);
extern int pm_autosleep_set_state(suspend_state_t state);

#else /* !CONFIG_PM_AUTOSLEEP */

static inline int pm_autosleep_init(void) { return 0; }
static inline int pm_autosleep_lock(void) { return 0; }
static inline void pm_autosleep_unlock(void) {}
static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }

#endif /* !CONFIG_PM_AUTOSLEEP */

#ifdef CONFIG_PM_WAKELOCKS

/* kernel/power/wakelock.c */
extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
extern int pm_wake_lock(const char *buf);
extern int pm_wake_unlock(const char *buf);

#endif /* !CONFIG_PM_WAKELOCKS */

static inline int pm_sleep_disable_secondary_cpus(void)
{
	cpuidle_pause();
	return suspend_disable_secondary_cpus();
}

static inline void pm_sleep_enable_secondary_cpus(void)
{
	suspend_enable_secondary_cpus();
	cpuidle_resume();
}

void dpm_save_errno(int err);
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4	2	#include <linux/suspend.h>
3010f8ca	3	#include <linux/suspend_ioctls.h>
1da177e4	4	#include <linux/utsname.h>
b28f5081	5	#include <linux/freezer.h>
52f5684c	6	#include <linux/compiler.h>
23f62d7a RW	7	#include <linux/cpu.h>
23f62d7a RW	8	#include <linux/cpuidle.h>
a06c6f5d	9	#include <linux/crypto.h>
1da177e4	10
1da177e4 LT	11	struct swsusp_info {
	12	struct new_utsname uts;
	13	u32 version_code;
	14	unsigned long num_physpages;
	15	int cpus;
	16	unsigned long image_pages;
7088a5c0	17	unsigned long pages;
6e1819d6	18	unsigned long size;
52f5684c	19	} __aligned(PAGE_SIZE);
1da177e4	20
d307c4a8	21	#ifdef CONFIG_HIBERNATION
ac5c24ec	22	/* kernel/power/snapshot.c */
ddeb6487	23	extern void __init hibernate_reserved_size_init(void);
ac5c24ec RW	24	extern void __init hibernate_image_size_init(void);
ac5c24ec RW	25
d307c4a8 RW	26	#ifdef CONFIG_ARCH_HIBERNATION_HEADER
	27	/* Maximum size of architecture specific data in a hibernation header */
	28	#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
1da177e4	29
d307c4a8 RW	30	static inline int init_header_complete(struct swsusp_info *info)
	31	{
	32	return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
	33	}
	34
02d7f400	35	static inline const char check_image_kernel(struct swsusp_info info)
d307c4a8 RW	36	{
	37	return arch_hibernation_header_restore(info) ?
	38	"architecture specific data" : NULL;
	39	}
	40	#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
1da177e4	41
56f99bcb RW	42	/*
	43	* Keep some memory free so that I/O operations can succeed without paging
	44	* [Might this be more than 4 MB?]
	45	*/
	46	#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
d307c4a8	47
56f99bcb RW	48	/*
	49	* Keep 1 MB of memory free so that device drivers can allocate some pages in
	50	* their .suspend() routines without breaking the suspend to disk.
	51	*/
	52	#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
1da177e4	53
04b73469 RK	54	asmlinkage int swsusp_save(void);
04b73469 RK	55
8b759b84	56	/* kernel/power/hibernate.c */
97819a26	57	extern bool freezer_test_done;
a06c6f5d N	58	extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
	59
	60	/* kernel/power/swap.c */
	61	extern unsigned int swsusp_header_flags;
97819a26	62
7777fab9	63	extern int hibernation_snapshot(int platform_mode);
a634cc10	64	extern int hibernation_restore(int platform_mode);
7777fab9	65	extern int hibernation_platform_enter(void);
ac5c24ec	66
0f5bf6d0	67	#ifdef CONFIG_STRICT_KERNEL_RWX
4c0b6c10 RW	68	/* kernel/power/snapshot.c */
	69	extern void enable_restore_image_protection(void);
	70	#else
	71	static inline void enable_restore_image_protection(void) {}
0f5bf6d0	72	#endif /* CONFIG_STRICT_KERNEL_RWX */
4c0b6c10	73
ac5c24ec RW	74	#else /* !CONFIG_HIBERNATION */
ac5c24ec RW	75
ddeb6487	76	static inline void hibernate_reserved_size_init(void) {}
ac5c24ec RW	77	static inline void hibernate_image_size_init(void) {}
ac5c24ec RW	78	#endif /* !CONFIG_HIBERNATION */
a6d70980	79
1da177e4	80	#define power_attr(_name) \
386f275f	81	static struct kobj_attribute _name##_attr = { \
1da177e4 LT	82	.attr = { \
	83	.name = __stringify(_name), \
	84	.mode = 0644, \
	85	}, \
	86	.show = _name##_show, \
	87	.store = _name##_store, \
	88	}
	89
a1e9ca69 RW	90	#define power_attr_ro(_name) \
	91	static struct kobj_attribute _name##_attr = { \
	92	.attr = { \
	93	.name = __stringify(_name), \
	94	.mode = S_IRUGO, \
	95	}, \
	96	.show = _name##_show, \
	97	}
	98
853609b6 RW	99	/* Preferred image size in bytes (default 500 MB) */
853609b6 RW	100	extern unsigned long image_size;
ddeb6487 RW	101	/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
ddeb6487 RW	102	extern unsigned long reserved_size;
f577eb30	103	extern int in_suspend;
61159a31	104	extern dev_t swsusp_resume_device;
9a154d9d	105	extern sector_t swsusp_resume_block;
f577eb30	106
74dfd666 RW	107	extern int create_basic_memory_bitmaps(void);
74dfd666 RW	108	extern void free_basic_memory_bitmaps(void);
64a473cb	109	extern int hibernate_preallocate_memory(void);
f577eb30	110
03b6c9a3	111	extern void clear_or_poison_free_pages(void);
1ad1410f	112
fb13a28b RW	113	/**
	114	* Auxiliary structure used for reading the snapshot image data and
	115	* metadata from and writing them to the list of page backup entries
	116	* (PBEs) which is the main data structure of swsusp.
	117	*
	118	* Using struct snapshot_handle we can transfer the image, including its
	119	* metadata, as a continuous sequence of bytes with the help of
	120	* snapshot_read_next() and snapshot_write_next().
	121	*
	122	* The code that writes the image to a storage or transfers it to
	123	* the user land is required to use snapshot_read_next() for this
	124	* purpose and it should not make any assumptions regarding the internal
	125	* structure of the image. Similarly, the code that reads the image from
	126	* a storage or transfers it from the user land is required to use
	127	* snapshot_write_next().
	128	*
	129	* This may allow us to change the internal structure of the image
	130	* in the future with considerably less effort.
	131	*/
	132
f577eb30	133	struct snapshot_handle {
fb13a28b RW	134	unsigned int cur; /* number of the block of PAGE_SIZE bytes the
	135	* next operation will refer to (ie. current)
	136	*/
fb13a28b RW	137	void buffer; / address of the block to read from
	138	* or write to
	139	*/
fb13a28b RW	140	int sync_read; /* Set to one to notify the caller of
	141	* snapshot_write_next() that it may
	142	* need to call wait_on_bio_chain()
	143	*/
f577eb30 RW	144	};
f577eb30 RW	145
fb13a28b RW	146	/* This macro returns the address from/to which the caller of
	147	* snapshot_read_next()/snapshot_write_next() is allowed to
	148	* read/write data after the function returns
	149	*/
d3c1b24c	150	#define data_of(handle) ((handle).buffer)
f577eb30	151
b788db79	152	extern unsigned int snapshot_additional_pages(struct zone *zone);
af508b34	153	extern unsigned long snapshot_get_image_size(void);
d3c1b24c JS	154	extern int snapshot_read_next(struct snapshot_handle *handle);
d3c1b24c JS	155	extern int snapshot_write_next(struct snapshot_handle *handle);
f4311756	156	int snapshot_write_finalize(struct snapshot_handle *handle);
b788db79	157	extern int snapshot_image_loaded(struct snapshot_handle *handle);
61159a31	158
ab7e9b06 DA	159	extern bool hibernate_acquire(void);
ab7e9b06 DA	160	extern void hibernate_release(void);
0709db60	161
d1d241cc RW	162	extern sector_t alloc_swapdev_block(int swap);
	163	extern void free_all_swap_pages(int swap);
	164	extern int swsusp_swap_in_use(void);
61159a31	165
a634cc10 RW	166	/*
	167	* Flags that can be passed from the hibernatig hernel to the "boot" kernel in
	168	* the image header.
	169	*/
8bc29736	170	#define SF_COMPRESSION_ALG_LZO 0 /* dummy, details given below */
a634cc10	171	#define SF_PLATFORM_MODE 1
f996fc96	172	#define SF_NOCOMPRESS_MODE 2
081a9d04	173	#define SF_CRC32_MODE 4
74d95555	174	#define SF_HW_SIG 8
a634cc10	175
8bc29736 N	176	/*
	177	* Bit to indicate the compression algorithm to be used(for LZ4). The same
	178	* could be checked while saving/loading image to/from disk to use the
	179	* corresponding algorithms.
	180	*
	181	* By default, LZO compression is enabled if SF_CRC32_MODE is set. Use
	182	* SF_COMPRESSION_ALG_LZ4 to override this behaviour and use LZ4.
	183	*
	184	* SF_CRC32_MODE, SF_COMPRESSION_ALG_LZO(dummy) -> Compression, LZO
	185	* SF_CRC32_MODE, SF_COMPRESSION_ALG_LZ4 -> Compression, LZ4
	186	*/
	187	#define SF_COMPRESSION_ALG_LZ4 16
	188
8b759b84	189	/* kernel/power/hibernate.c */
40d84e19	190	int swsusp_check(bool exclusive);
74c7e2ef	191	extern void swsusp_free(void);
a634cc10 RW	192	extern int swsusp_read(unsigned int *flags_p);
a634cc10 RW	193	extern int swsusp_write(unsigned int flags);
93745df1	194	void swsusp_close(void);
62c552cc BS	195	#ifdef CONFIG_SUSPEND
62c552cc BS	196	extern int swsusp_unmark(void);
0c4cae1b CF	197	#else
0c4cae1b CF	198	static inline int swsusp_unmark(void) { return 0; }
62c552cc	199	#endif
0d3a9abe	200
75d319c0	201	struct __kernel_old_timeval;
b10d9117	202	/* kernel/power/swsusp.c */
db597605	203	extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
b10d9117	204
296699de	205	#ifdef CONFIG_SUSPEND
a9d70523	206	/* kernel/power/suspend.c */
406e7938	207	extern const char * const pm_labels[];
d431cbc5	208	extern const char *pm_states[];
406e7938	209	extern const char *mem_sleep_states[];
a9d70523	210
6c961dfb	211	extern int suspend_devices_and_enter(suspend_state_t state);
296699de	212	#else /* !CONFIG_SUSPEND */
406e7938 RW	213	#define mem_sleep_current PM_SUSPEND_ON
406e7938 RW	214
296699de RW	215	static inline int suspend_devices_and_enter(suspend_state_t state)
	216	{
	217	return -ENOSYS;
	218	}
	219	#endif /* !CONFIG_SUSPEND */
	220
a9d70523 RW	221	#ifdef CONFIG_PM_TEST_SUSPEND
	222	/* kernel/power/suspend_test.c */
	223	extern void suspend_test_start(void);
	224	extern void suspend_test_finish(const char *label);
	225	#else /* !CONFIG_PM_TEST_SUSPEND */
	226	static inline void suspend_test_start(void) {}
	227	static inline void suspend_test_finish(const char *label) {}
	228	#endif /* !CONFIG_PM_TEST_SUSPEND */
	229
82525756 AS	230	#ifdef CONFIG_PM_SLEEP
82525756 AS	231	/* kernel/power/main.c */
70d93298	232	extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
82525756	233	extern int pm_notifier_call_chain(unsigned long val);
07f44ac3 KW	234	void pm_restrict_gfp_mask(void);
	235	void pm_restore_gfp_mask(void);
	236	#else
	237	static inline void pm_restrict_gfp_mask(void) {}
	238	static inline void pm_restore_gfp_mask(void) {}
82525756	239	#endif
2f8ed1c6 AB	240
2f8ed1c6 AB	241	#ifdef CONFIG_HIGHMEM
2f8ed1c6 AB	242	int restore_highmem(void);
	243	#else
	244	static inline unsigned int count_highmem_pages(void) { return 0; }
	245	static inline int restore_highmem(void) { return 0; }
	246	#endif
0e7d56e3 RW	247
	248	/*
	249	* Suspend test levels
	250	*/
	251	enum {
	252	/* keep first */
	253	TEST_NONE,
	254	TEST_CORE,
	255	TEST_CPUS,
	256	TEST_PLATFORM,
	257	TEST_DEVICES,
	258	TEST_FREEZER,
	259	/* keep last */
	260	__TEST_AFTER_LAST
	261	};
	262
	263	#define TEST_FIRST TEST_NONE
	264	#define TEST_MAX (__TEST_AFTER_LAST - 1)
4cc79776	265
e516a1db	266	#ifdef CONFIG_PM_SLEEP_DEBUG
4cc79776	267	extern int pm_test_level;
8e6bcd9f RW	268	#else
	269	#define pm_test_level (TEST_NONE)
	270	#endif
b28f5081 JB	271
	272	#ifdef CONFIG_SUSPEND_FREEZER
	273	static inline int suspend_freeze_processes(void)
	274	{
379e0be8 SB	275	int error;
	276
	277	error = freeze_processes();
379e0be8 SB	278	/*
	279	* freeze_processes() automatically thaws every task if freezing
	280	* fails. So we need not do anything extra upon error.
	281	*/
	282	if (error)
6f585f75	283	return error;
379e0be8 SB	284
379e0be8 SB	285	error = freeze_kernel_threads();
379e0be8 SB	286	/*
	287	* freeze_kernel_threads() thaws only kernel threads upon freezing
	288	* failure. So we have to thaw the userspace tasks ourselves.
	289	*/
	290	if (error)
	291	thaw_processes();
	292
379e0be8	293	return error;
b28f5081 JB	294	}
	295
	296	static inline void suspend_thaw_processes(void)
	297	{
	298	thaw_processes();
	299	}
	300	#else
	301	static inline int suspend_freeze_processes(void)
	302	{
	303	return 0;
	304	}
	305
	306	static inline void suspend_thaw_processes(void)
	307	{
	308	}
	309	#endif
7483b4a4 RW	310
	311	#ifdef CONFIG_PM_AUTOSLEEP
	312
	313	/* kernel/power/autosleep.c */
	314	extern int pm_autosleep_init(void);
	315	extern int pm_autosleep_lock(void);
	316	extern void pm_autosleep_unlock(void);
	317	extern suspend_state_t pm_autosleep_state(void);
	318	extern int pm_autosleep_set_state(suspend_state_t state);
	319
	320	#else /* !CONFIG_PM_AUTOSLEEP */
	321
	322	static inline int pm_autosleep_init(void) { return 0; }
	323	static inline int pm_autosleep_lock(void) { return 0; }
	324	static inline void pm_autosleep_unlock(void) {}
	325	static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
	326
	327	#endif /* !CONFIG_PM_AUTOSLEEP */
b86ff982 RW	328
	329	#ifdef CONFIG_PM_WAKELOCKS
	330
	331	/* kernel/power/wakelock.c */
	332	extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
	333	extern int pm_wake_lock(const char *buf);
	334	extern int pm_wake_unlock(const char *buf);
	335
	336	#endif /* !CONFIG_PM_WAKELOCKS */
23f62d7a RW	337
	338	static inline int pm_sleep_disable_secondary_cpus(void)
	339	{
	340	cpuidle_pause();
	341	return suspend_disable_secondary_cpus();
	342	}
	343
	344	static inline void pm_sleep_enable_secondary_cpus(void)
	345	{
	346	suspend_enable_secondary_cpus();
	347	cpuidle_resume();
	348	}
9ff544fa RW	349
9ff544fa RW	350	void dpm_save_errno(int err);