1 #include <linux/suspend.h> 2 #include <linux/suspend_ioctls.h> 3 #include <linux/utsname.h> 4 #include <linux/freezer.h> 5 6 struct swsusp_info { 7 struct new_utsname uts; 8 u32 version_code; 9 unsigned long num_physpages; 10 int cpus; 11 unsigned long image_pages; 12 unsigned long pages; 13 unsigned long size; 14 } __attribute__((aligned(PAGE_SIZE))); 15 16 #ifdef CONFIG_HIBERNATION 17 #ifdef CONFIG_ARCH_HIBERNATION_HEADER 18 /* Maximum size of architecture specific data in a hibernation header */ 19 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) 20 21 extern int arch_hibernation_header_save(void *addr, unsigned int max_size); 22 extern int arch_hibernation_header_restore(void *addr); 23 24 static inline int init_header_complete(struct swsusp_info *info) 25 { 26 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); 27 } 28 29 static inline char *check_image_kernel(struct swsusp_info *info) 30 { 31 return arch_hibernation_header_restore(info) ? 32 "architecture specific data" : NULL; 33 } 34 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ 35 36 /* 37 * Keep some memory free so that I/O operations can succeed without paging 38 * [Might this be more than 4 MB?] 39 */ 40 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) 41 42 /* 43 * Keep 1 MB of memory free so that device drivers can allocate some pages in 44 * their .suspend() routines without breaking the suspend to disk. 45 */ 46 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) 47 48 /* kernel/power/disk.c */ 49 extern int hibernation_snapshot(int platform_mode); 50 extern int hibernation_restore(int platform_mode); 51 extern int hibernation_platform_enter(void); 52 #endif 53 54 extern int pfn_is_nosave(unsigned long); 55 56 extern struct mutex pm_mutex; 57 58 #define power_attr(_name) \ 59 static struct kobj_attribute _name##_attr = { \ 60 .attr = { \ 61 .name = __stringify(_name), \ 62 .mode = 0644, \ 63 }, \ 64 .show = _name##_show, \ 65 .store = _name##_store, \ 66 } 67 68 /* Preferred image size in bytes (default 500 MB) */ 69 extern unsigned long image_size; 70 extern int in_suspend; 71 extern dev_t swsusp_resume_device; 72 extern sector_t swsusp_resume_block; 73 74 extern asmlinkage int swsusp_arch_suspend(void); 75 extern asmlinkage int swsusp_arch_resume(void); 76 77 extern int create_basic_memory_bitmaps(void); 78 extern void free_basic_memory_bitmaps(void); 79 extern unsigned int count_data_pages(void); 80 81 /** 82 * Auxiliary structure used for reading the snapshot image data and 83 * metadata from and writing them to the list of page backup entries 84 * (PBEs) which is the main data structure of swsusp. 85 * 86 * Using struct snapshot_handle we can transfer the image, including its 87 * metadata, as a continuous sequence of bytes with the help of 88 * snapshot_read_next() and snapshot_write_next(). 89 * 90 * The code that writes the image to a storage or transfers it to 91 * the user land is required to use snapshot_read_next() for this 92 * purpose and it should not make any assumptions regarding the internal 93 * structure of the image. Similarly, the code that reads the image from 94 * a storage or transfers it from the user land is required to use 95 * snapshot_write_next(). 96 * 97 * This may allow us to change the internal structure of the image 98 * in the future with considerably less effort. 99 */ 100 101 struct snapshot_handle { 102 loff_t offset; /* number of the last byte ready for reading 103 * or writing in the sequence 104 */ 105 unsigned int cur; /* number of the block of PAGE_SIZE bytes the 106 * next operation will refer to (ie. current) 107 */ 108 unsigned int cur_offset; /* offset with respect to the current 109 * block (for the next operation) 110 */ 111 unsigned int prev; /* number of the block of PAGE_SIZE bytes that 112 * was the current one previously 113 */ 114 void *buffer; /* address of the block to read from 115 * or write to 116 */ 117 unsigned int buf_offset; /* location to read from or write to, 118 * given as a displacement from 'buffer' 119 */ 120 int sync_read; /* Set to one to notify the caller of 121 * snapshot_write_next() that it may 122 * need to call wait_on_bio_chain() 123 */ 124 }; 125 126 /* This macro returns the address from/to which the caller of 127 * snapshot_read_next()/snapshot_write_next() is allowed to 128 * read/write data after the function returns 129 */ 130 #define data_of(handle) ((handle).buffer + (handle).buf_offset) 131 132 extern unsigned int snapshot_additional_pages(struct zone *zone); 133 extern unsigned long snapshot_get_image_size(void); 134 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); 135 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); 136 extern void snapshot_write_finalize(struct snapshot_handle *handle); 137 extern int snapshot_image_loaded(struct snapshot_handle *handle); 138 139 /* If unset, the snapshot device cannot be open. */ 140 extern atomic_t snapshot_device_available; 141 142 extern sector_t alloc_swapdev_block(int swap); 143 extern void free_all_swap_pages(int swap); 144 extern int swsusp_swap_in_use(void); 145 146 /* 147 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in 148 * the image header. 149 */ 150 #define SF_PLATFORM_MODE 1 151 152 /* kernel/power/disk.c */ 153 extern int swsusp_check(void); 154 extern int swsusp_shrink_memory(void); 155 extern void swsusp_free(void); 156 extern int swsusp_read(unsigned int *flags_p); 157 extern int swsusp_write(unsigned int flags); 158 extern void swsusp_close(void); 159 160 struct timeval; 161 /* kernel/power/swsusp.c */ 162 extern void swsusp_show_speed(struct timeval *, struct timeval *, 163 unsigned int, char *); 164 165 #ifdef CONFIG_SUSPEND 166 /* kernel/power/main.c */ 167 extern int suspend_devices_and_enter(suspend_state_t state); 168 #else /* !CONFIG_SUSPEND */ 169 static inline int suspend_devices_and_enter(suspend_state_t state) 170 { 171 return -ENOSYS; 172 } 173 #endif /* !CONFIG_SUSPEND */ 174 175 #ifdef CONFIG_PM_SLEEP 176 /* kernel/power/main.c */ 177 extern int pm_notifier_call_chain(unsigned long val); 178 #endif 179 180 #ifdef CONFIG_HIGHMEM 181 unsigned int count_highmem_pages(void); 182 int restore_highmem(void); 183 #else 184 static inline unsigned int count_highmem_pages(void) { return 0; } 185 static inline int restore_highmem(void) { return 0; } 186 #endif 187 188 /* 189 * Suspend test levels 190 */ 191 enum { 192 /* keep first */ 193 TEST_NONE, 194 TEST_CORE, 195 TEST_CPUS, 196 TEST_PLATFORM, 197 TEST_DEVICES, 198 TEST_FREEZER, 199 /* keep last */ 200 __TEST_AFTER_LAST 201 }; 202 203 #define TEST_FIRST TEST_NONE 204 #define TEST_MAX (__TEST_AFTER_LAST - 1) 205 206 extern int pm_test_level; 207 208 #ifdef CONFIG_SUSPEND_FREEZER 209 static inline int suspend_freeze_processes(void) 210 { 211 return freeze_processes(); 212 } 213 214 static inline void suspend_thaw_processes(void) 215 { 216 thaw_processes(); 217 } 218 #else 219 static inline int suspend_freeze_processes(void) 220 { 221 return 0; 222 } 223 224 static inline void suspend_thaw_processes(void) 225 { 226 } 227 #endif 228