9b238205ba
Add the SNAPSHOT_S2RAM ioctl to the snapshot device. This ioctl allows a userland application to make the system (previously frozen with the SNAPSHOT_FREE ioctl) enter the S3 state without freezing processes and disabling nonboot CPUs for the second time. This will allow us to implement the suspend-to-disk-and-RAM (STDR) functionality in the userland suspend tools. Signed-off-by: Luca Tettamanti <kronos.it@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
#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_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
|
|
#define SNAPSHOT_IOC_MAXNR 11
|
|
|
|
/**
|
|
* 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);
|
|
extern int suspend_enter(suspend_state_t state);
|