[mirror_ubuntu-artful-kernel.git] / kernel / power / power.h

#include <linux/suspend.h>
#include <linux/utsname.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;
} __attribute__((aligned(PAGE_SIZE)));


#ifdef CONFIG_SOFTWARE_SUSPEND
extern int pm_suspend_disk(void);

#else
static inline int pm_suspend_disk(void)
{
	return -EPERM;
}
#endif
extern struct semaphore pm_sem;
#define power_attr(_name) \
static struct subsys_attribute _name##_attr = {	\
	.attr	= {				\
		.name = __stringify(_name),	\
		.mode = 0644,			\
	},					\
	.show	= _name##_show,			\
	.store	= _name##_store,		\
}

extern struct subsystem power_subsys;

/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;

extern struct pbe *pagedir_nosave;

/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
extern int in_suspend;
extern dev_t swsusp_resume_device;

extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);

extern unsigned int count_data_pages(void);

struct snapshot_handle {
	loff_t		offset;
	unsigned int	page;
	unsigned int	page_offset;
	unsigned int	prev;
	struct pbe	*pbe;
	void		*buffer;
	unsigned int	buf_offset;
};

#define data_of(handle)	((handle).buffer + (handle).buf_offset)

extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
int snapshot_image_loaded(struct snapshot_handle *handle);

#define SNAPSHOT_IOC_MAGIC	'3'
#define SNAPSHOT_FREEZE			_IO(SNAPSHOT_IOC_MAGIC, 1)
#define SNAPSHOT_UNFREEZE		_IO(SNAPSHOT_IOC_MAGIC, 2)
#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
#define SNAPSHOT_ATOMIC_RESTORE		_IO(SNAPSHOT_IOC_MAGIC, 4)
#define SNAPSHOT_FREE			_IO(SNAPSHOT_IOC_MAGIC, 5)
#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
#define SNAPSHOT_FREE_SWAP_PAGES	_IO(SNAPSHOT_IOC_MAGIC, 9)
#define SNAPSHOT_SET_SWAP_FILE		_IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
#define SNAPSHOT_IOC_MAXNR	10

/**
 *	The bitmap is used for tracing allocated swap pages
 *
 *	The entire bitmap consists of a number of bitmap_page
 *	structures linked with the help of the .next member.
 *	Thus each page can be allocated individually, so we only
 *	need to make 0-order memory allocations to create
 *	the bitmap.
 */

#define BITMAP_PAGE_SIZE	(PAGE_SIZE - sizeof(void *))
#define BITMAP_PAGE_CHUNKS	(BITMAP_PAGE_SIZE / sizeof(long))
#define BITS_PER_CHUNK		(sizeof(long) * 8)
#define BITMAP_PAGE_BITS	(BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)

struct bitmap_page {
	unsigned long		chunks[BITMAP_PAGE_CHUNKS];
	struct bitmap_page	*next;
};

extern void free_bitmap(struct bitmap_page *bitmap);
extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);

extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
extern void swsusp_free(void);
extern int swsusp_suspend(void);
extern int swsusp_resume(void);
extern int swsusp_read(void);
extern int swsusp_write(void);
extern void swsusp_close(void);
Commit	Line	Data
1da177e4 LT	1	#include <linux/suspend.h>
	2	#include <linux/utsname.h>
	3
1da177e4 LT	4	struct swsusp_info {
	5	struct new_utsname uts;
	6	u32 version_code;
	7	unsigned long num_physpages;
	8	int cpus;
	9	unsigned long image_pages;
7088a5c0	10	unsigned long pages;
6e1819d6	11	unsigned long size;
1da177e4 LT	12	} __attribute__((aligned(PAGE_SIZE)));
	13
	14
	15
	16	#ifdef CONFIG_SOFTWARE_SUSPEND
	17	extern int pm_suspend_disk(void);
	18
	19	#else
	20	static inline int pm_suspend_disk(void)
	21	{
	22	return -EPERM;
	23	}
	24	#endif
	25	extern struct semaphore pm_sem;
	26	#define power_attr(_name) \
	27	static struct subsys_attribute _name##_attr = { \
	28	.attr = { \
	29	.name = __stringify(_name), \
	30	.mode = 0644, \
	31	}, \
	32	.show = _name##_show, \
	33	.store = _name##_store, \
	34	}
	35
	36	extern struct subsystem power_subsys;
	37
25761b6e RW	38	/* References to section boundaries */
	39	extern const void __nosave_begin, __nosave_end;
	40
72a97e08 RW	41	extern struct pbe *pagedir_nosave;
72a97e08 RW	42
853609b6 RW	43	/* Preferred image size in bytes (default 500 MB) */
853609b6 RW	44	extern unsigned long image_size;
f577eb30	45	extern int in_suspend;
61159a31	46	extern dev_t swsusp_resume_device;
f577eb30	47
25761b6e RW	48	extern asmlinkage int swsusp_arch_suspend(void);
	49	extern asmlinkage int swsusp_arch_resume(void);
	50
72a97e08	51	extern unsigned int count_data_pages(void);
f577eb30 RW	52
	53	struct snapshot_handle {
	54	loff_t offset;
	55	unsigned int page;
	56	unsigned int page_offset;
	57	unsigned int prev;
	58	struct pbe *pbe;
	59	void *buffer;
	60	unsigned int buf_offset;
	61	};
	62
	63	#define data_of(handle) ((handle).buffer + (handle).buf_offset)
	64
	65	extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
	66	extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
	67	int snapshot_image_loaded(struct snapshot_handle *handle);
61159a31	68
6e1819d6 RW	69	#define SNAPSHOT_IOC_MAGIC '3'
	70	#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
	71	#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
	72	#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
	73	#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
	74	#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
	75	#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
	76	#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
	77	#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
	78	#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
	79	#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
	80	#define SNAPSHOT_IOC_MAXNR 10
	81
61159a31 RW	82	/**
	83	* The bitmap is used for tracing allocated swap pages
	84	*
	85	* The entire bitmap consists of a number of bitmap_page
	86	* structures linked with the help of the .next member.
	87	* Thus each page can be allocated individually, so we only
	88	* need to make 0-order memory allocations to create
	89	* the bitmap.
	90	*/
	91
	92	#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
	93	#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
	94	#define BITS_PER_CHUNK (sizeof(long) * 8)
	95	#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
	96
	97	struct bitmap_page {
	98	unsigned long chunks[BITMAP_PAGE_CHUNKS];
	99	struct bitmap_page *next;
	100	};
	101
	102	extern void free_bitmap(struct bitmap_page *bitmap);
	103	extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
	104	extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
	105	extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
	106
74c7e2ef	107	extern int swsusp_check(void);
61159a31	108	extern int swsusp_shrink_memory(void);
74c7e2ef	109	extern void swsusp_free(void);
61159a31 RW	110	extern int swsusp_suspend(void);
61159a31 RW	111	extern int swsusp_resume(void);
74c7e2ef RD	112	extern int swsusp_read(void);
	113	extern int swsusp_write(void);
	114	extern void swsusp_close(void);