[mirror_ubuntu-bionic-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;
} __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);

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