1 #include <linux/suspend.h> 2 #include <linux/utsname.h> 3 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; 10 unsigned long pages; 11 unsigned long size; 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 38 /* References to section boundaries */ 39 extern const void __nosave_begin, __nosave_end; 40 41 extern struct pbe *pagedir_nosave; 42 43 /* Preferred image size in bytes (default 500 MB) */ 44 extern unsigned long image_size; 45 extern int in_suspend; 46 extern dev_t swsusp_resume_device; 47 48 extern asmlinkage int swsusp_arch_suspend(void); 49 extern asmlinkage int swsusp_arch_resume(void); 50 51 extern unsigned int count_data_pages(void); 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); 68 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_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11) 81 #define SNAPSHOT_IOC_MAXNR 11 82 83 /** 84 * The bitmap is used for tracing allocated swap pages 85 * 86 * The entire bitmap consists of a number of bitmap_page 87 * structures linked with the help of the .next member. 88 * Thus each page can be allocated individually, so we only 89 * need to make 0-order memory allocations to create 90 * the bitmap. 91 */ 92 93 #define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *)) 94 #define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long)) 95 #define BITS_PER_CHUNK (sizeof(long) * 8) 96 #define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK) 97 98 struct bitmap_page { 99 unsigned long chunks[BITMAP_PAGE_CHUNKS]; 100 struct bitmap_page *next; 101 }; 102 103 extern void free_bitmap(struct bitmap_page *bitmap); 104 extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits); 105 extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap); 106 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap); 107 108 extern int swsusp_check(void); 109 extern int swsusp_shrink_memory(void); 110 extern void swsusp_free(void); 111 extern int swsusp_suspend(void); 112 extern int swsusp_resume(void); 113 extern int swsusp_read(void); 114 extern int swsusp_write(void); 115 extern void swsusp_close(void); 116 extern int suspend_enter(suspend_state_t state); 117