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 /* 18 * Keep some memory free so that I/O operations can succeed without paging 19 * [Might this be more than 4 MB?] 20 */ 21 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) 22 /* 23 * Keep 1 MB of memory free so that device drivers can allocate some pages in 24 * their .suspend() routines without breaking the suspend to disk. 25 */ 26 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) 27 28 extern struct hibernation_ops *hibernation_ops; 29 #endif 30 31 extern int pfn_is_nosave(unsigned long); 32 33 extern struct mutex pm_mutex; 34 35 #define power_attr(_name) \ 36 static struct subsys_attribute _name##_attr = { \ 37 .attr = { \ 38 .name = __stringify(_name), \ 39 .mode = 0644, \ 40 }, \ 41 .show = _name##_show, \ 42 .store = _name##_store, \ 43 } 44 45 extern struct kset power_subsys; 46 47 /* Preferred image size in bytes (default 500 MB) */ 48 extern unsigned long image_size; 49 extern int in_suspend; 50 extern dev_t swsusp_resume_device; 51 extern sector_t swsusp_resume_block; 52 53 extern asmlinkage int swsusp_arch_suspend(void); 54 extern asmlinkage int swsusp_arch_resume(void); 55 56 extern int create_basic_memory_bitmaps(void); 57 extern void free_basic_memory_bitmaps(void); 58 extern unsigned int count_data_pages(void); 59 60 /** 61 * Auxiliary structure used for reading the snapshot image data and 62 * metadata from and writing them to the list of page backup entries 63 * (PBEs) which is the main data structure of swsusp. 64 * 65 * Using struct snapshot_handle we can transfer the image, including its 66 * metadata, as a continuous sequence of bytes with the help of 67 * snapshot_read_next() and snapshot_write_next(). 68 * 69 * The code that writes the image to a storage or transfers it to 70 * the user land is required to use snapshot_read_next() for this 71 * purpose and it should not make any assumptions regarding the internal 72 * structure of the image. Similarly, the code that reads the image from 73 * a storage or transfers it from the user land is required to use 74 * snapshot_write_next(). 75 * 76 * This may allow us to change the internal structure of the image 77 * in the future with considerably less effort. 78 */ 79 80 struct snapshot_handle { 81 loff_t offset; /* number of the last byte ready for reading 82 * or writing in the sequence 83 */ 84 unsigned int cur; /* number of the block of PAGE_SIZE bytes the 85 * next operation will refer to (ie. current) 86 */ 87 unsigned int cur_offset; /* offset with respect to the current 88 * block (for the next operation) 89 */ 90 unsigned int prev; /* number of the block of PAGE_SIZE bytes that 91 * was the current one previously 92 */ 93 void *buffer; /* address of the block to read from 94 * or write to 95 */ 96 unsigned int buf_offset; /* location to read from or write to, 97 * given as a displacement from 'buffer' 98 */ 99 int sync_read; /* Set to one to notify the caller of 100 * snapshot_write_next() that it may 101 * need to call wait_on_bio_chain() 102 */ 103 }; 104 105 /* This macro returns the address from/to which the caller of 106 * snapshot_read_next()/snapshot_write_next() is allowed to 107 * read/write data after the function returns 108 */ 109 #define data_of(handle) ((handle).buffer + (handle).buf_offset) 110 111 extern unsigned int snapshot_additional_pages(struct zone *zone); 112 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); 113 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); 114 extern void snapshot_write_finalize(struct snapshot_handle *handle); 115 extern int snapshot_image_loaded(struct snapshot_handle *handle); 116 117 /* 118 * This structure is used to pass the values needed for the identification 119 * of the resume swap area from a user space to the kernel via the 120 * SNAPSHOT_SET_SWAP_AREA ioctl 121 */ 122 struct resume_swap_area { 123 loff_t offset; 124 u_int32_t dev; 125 } __attribute__((packed)); 126 127 #define SNAPSHOT_IOC_MAGIC '3' 128 #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1) 129 #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2) 130 #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *) 131 #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4) 132 #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5) 133 #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long) 134 #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *) 135 #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *) 136 #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9) 137 #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int) 138 #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11) 139 #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) 140 #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \ 141 struct resume_swap_area) 142 #define SNAPSHOT_IOC_MAXNR 13 143 144 #define PMOPS_PREPARE 1 145 #define PMOPS_ENTER 2 146 #define PMOPS_FINISH 3 147 148 /* If unset, the snapshot device cannot be open. */ 149 extern atomic_t snapshot_device_available; 150 151 extern sector_t alloc_swapdev_block(int swap); 152 extern void free_all_swap_pages(int swap); 153 extern int swsusp_swap_in_use(void); 154 155 extern int swsusp_check(void); 156 extern int swsusp_shrink_memory(void); 157 extern void swsusp_free(void); 158 extern int swsusp_suspend(void); 159 extern int swsusp_resume(void); 160 extern int swsusp_read(void); 161 extern int swsusp_write(void); 162 extern void swsusp_close(void); 163 extern int suspend_enter(suspend_state_t state); 164 165 struct timeval; 166 extern void swsusp_show_speed(struct timeval *, struct timeval *, 167 unsigned int, char *); 168