1 #include <linux/suspend.h> 2 #include <linux/suspend_ioctls.h> 3 #include <linux/utsname.h> 4 #include <linux/freezer.h> 5 #include <linux/compiler.h> 6 7 struct swsusp_info { 8 struct new_utsname uts; 9 u32 version_code; 10 unsigned long num_physpages; 11 int cpus; 12 unsigned long image_pages; 13 unsigned long pages; 14 unsigned long size; 15 } __aligned(PAGE_SIZE); 16 17 #ifdef CONFIG_HIBERNATION 18 /* kernel/power/snapshot.c */ 19 extern void __init hibernate_reserved_size_init(void); 20 extern void __init hibernate_image_size_init(void); 21 22 #ifdef CONFIG_ARCH_HIBERNATION_HEADER 23 /* Maximum size of architecture specific data in a hibernation header */ 24 #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) 25 26 extern int arch_hibernation_header_save(void *addr, unsigned int max_size); 27 extern int arch_hibernation_header_restore(void *addr); 28 29 static inline int init_header_complete(struct swsusp_info *info) 30 { 31 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); 32 } 33 34 static inline char *check_image_kernel(struct swsusp_info *info) 35 { 36 return arch_hibernation_header_restore(info) ? 37 "architecture specific data" : NULL; 38 } 39 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ 40 41 /* 42 * Keep some memory free so that I/O operations can succeed without paging 43 * [Might this be more than 4 MB?] 44 */ 45 #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) 46 47 /* 48 * Keep 1 MB of memory free so that device drivers can allocate some pages in 49 * their .suspend() routines without breaking the suspend to disk. 50 */ 51 #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) 52 53 asmlinkage int swsusp_save(void); 54 55 /* kernel/power/hibernate.c */ 56 extern bool freezer_test_done; 57 58 extern int hibernation_snapshot(int platform_mode); 59 extern int hibernation_restore(int platform_mode); 60 extern int hibernation_platform_enter(void); 61 62 #else /* !CONFIG_HIBERNATION */ 63 64 static inline void hibernate_reserved_size_init(void) {} 65 static inline void hibernate_image_size_init(void) {} 66 #endif /* !CONFIG_HIBERNATION */ 67 68 extern int pfn_is_nosave(unsigned long); 69 70 #define power_attr(_name) \ 71 static struct kobj_attribute _name##_attr = { \ 72 .attr = { \ 73 .name = __stringify(_name), \ 74 .mode = 0644, \ 75 }, \ 76 .show = _name##_show, \ 77 .store = _name##_store, \ 78 } 79 80 /* Preferred image size in bytes (default 500 MB) */ 81 extern unsigned long image_size; 82 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */ 83 extern unsigned long reserved_size; 84 extern int in_suspend; 85 extern dev_t swsusp_resume_device; 86 extern sector_t swsusp_resume_block; 87 88 extern asmlinkage int swsusp_arch_suspend(void); 89 extern asmlinkage int swsusp_arch_resume(void); 90 91 extern int create_basic_memory_bitmaps(void); 92 extern void free_basic_memory_bitmaps(void); 93 extern int hibernate_preallocate_memory(void); 94 95 /** 96 * Auxiliary structure used for reading the snapshot image data and 97 * metadata from and writing them to the list of page backup entries 98 * (PBEs) which is the main data structure of swsusp. 99 * 100 * Using struct snapshot_handle we can transfer the image, including its 101 * metadata, as a continuous sequence of bytes with the help of 102 * snapshot_read_next() and snapshot_write_next(). 103 * 104 * The code that writes the image to a storage or transfers it to 105 * the user land is required to use snapshot_read_next() for this 106 * purpose and it should not make any assumptions regarding the internal 107 * structure of the image. Similarly, the code that reads the image from 108 * a storage or transfers it from the user land is required to use 109 * snapshot_write_next(). 110 * 111 * This may allow us to change the internal structure of the image 112 * in the future with considerably less effort. 113 */ 114 115 struct snapshot_handle { 116 unsigned int cur; /* number of the block of PAGE_SIZE bytes the 117 * next operation will refer to (ie. current) 118 */ 119 void *buffer; /* address of the block to read from 120 * or write to 121 */ 122 int sync_read; /* Set to one to notify the caller of 123 * snapshot_write_next() that it may 124 * need to call wait_on_bio_chain() 125 */ 126 }; 127 128 /* This macro returns the address from/to which the caller of 129 * snapshot_read_next()/snapshot_write_next() is allowed to 130 * read/write data after the function returns 131 */ 132 #define data_of(handle) ((handle).buffer) 133 134 extern unsigned int snapshot_additional_pages(struct zone *zone); 135 extern unsigned long snapshot_get_image_size(void); 136 extern int snapshot_read_next(struct snapshot_handle *handle); 137 extern int snapshot_write_next(struct snapshot_handle *handle); 138 extern void snapshot_write_finalize(struct snapshot_handle *handle); 139 extern int snapshot_image_loaded(struct snapshot_handle *handle); 140 141 /* If unset, the snapshot device cannot be open. */ 142 extern atomic_t snapshot_device_available; 143 144 extern sector_t alloc_swapdev_block(int swap); 145 extern void free_all_swap_pages(int swap); 146 extern int swsusp_swap_in_use(void); 147 148 /* 149 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in 150 * the image header. 151 */ 152 #define SF_PLATFORM_MODE 1 153 #define SF_NOCOMPRESS_MODE 2 154 #define SF_CRC32_MODE 4 155 156 /* kernel/power/hibernate.c */ 157 extern int swsusp_check(void); 158 extern void swsusp_free(void); 159 extern int swsusp_read(unsigned int *flags_p); 160 extern int swsusp_write(unsigned int flags); 161 extern void swsusp_close(fmode_t); 162 #ifdef CONFIG_SUSPEND 163 extern int swsusp_unmark(void); 164 #endif 165 166 /* kernel/power/block_io.c */ 167 extern struct block_device *hib_resume_bdev; 168 169 extern int hib_bio_read_page(pgoff_t page_off, void *addr, 170 struct bio **bio_chain); 171 extern int hib_bio_write_page(pgoff_t page_off, void *addr, 172 struct bio **bio_chain); 173 extern int hib_wait_on_bio_chain(struct bio **bio_chain); 174 175 struct timeval; 176 /* kernel/power/swsusp.c */ 177 extern void swsusp_show_speed(struct timeval *, struct timeval *, 178 unsigned int, char *); 179 180 #ifdef CONFIG_SUSPEND 181 /* kernel/power/suspend.c */ 182 extern const char *const pm_states[]; 183 184 extern bool valid_state(suspend_state_t state); 185 extern int suspend_devices_and_enter(suspend_state_t state); 186 #else /* !CONFIG_SUSPEND */ 187 static inline int suspend_devices_and_enter(suspend_state_t state) 188 { 189 return -ENOSYS; 190 } 191 static inline bool valid_state(suspend_state_t state) { return false; } 192 #endif /* !CONFIG_SUSPEND */ 193 194 #ifdef CONFIG_PM_TEST_SUSPEND 195 /* kernel/power/suspend_test.c */ 196 extern void suspend_test_start(void); 197 extern void suspend_test_finish(const char *label); 198 #else /* !CONFIG_PM_TEST_SUSPEND */ 199 static inline void suspend_test_start(void) {} 200 static inline void suspend_test_finish(const char *label) {} 201 #endif /* !CONFIG_PM_TEST_SUSPEND */ 202 203 #ifdef CONFIG_PM_SLEEP 204 /* kernel/power/main.c */ 205 extern int pm_notifier_call_chain(unsigned long val); 206 #endif 207 208 #ifdef CONFIG_HIGHMEM 209 int restore_highmem(void); 210 #else 211 static inline unsigned int count_highmem_pages(void) { return 0; } 212 static inline int restore_highmem(void) { return 0; } 213 #endif 214 215 /* 216 * Suspend test levels 217 */ 218 enum { 219 /* keep first */ 220 TEST_NONE, 221 TEST_CORE, 222 TEST_CPUS, 223 TEST_PLATFORM, 224 TEST_DEVICES, 225 TEST_FREEZER, 226 /* keep last */ 227 __TEST_AFTER_LAST 228 }; 229 230 #define TEST_FIRST TEST_NONE 231 #define TEST_MAX (__TEST_AFTER_LAST - 1) 232 233 extern int pm_test_level; 234 235 #ifdef CONFIG_SUSPEND_FREEZER 236 static inline int suspend_freeze_processes(void) 237 { 238 int error; 239 240 error = freeze_processes(); 241 /* 242 * freeze_processes() automatically thaws every task if freezing 243 * fails. So we need not do anything extra upon error. 244 */ 245 if (error) 246 return error; 247 248 error = freeze_kernel_threads(); 249 /* 250 * freeze_kernel_threads() thaws only kernel threads upon freezing 251 * failure. So we have to thaw the userspace tasks ourselves. 252 */ 253 if (error) 254 thaw_processes(); 255 256 return error; 257 } 258 259 static inline void suspend_thaw_processes(void) 260 { 261 thaw_processes(); 262 } 263 #else 264 static inline int suspend_freeze_processes(void) 265 { 266 return 0; 267 } 268 269 static inline void suspend_thaw_processes(void) 270 { 271 } 272 #endif 273 274 #ifdef CONFIG_PM_AUTOSLEEP 275 276 /* kernel/power/autosleep.c */ 277 extern int pm_autosleep_init(void); 278 extern int pm_autosleep_lock(void); 279 extern void pm_autosleep_unlock(void); 280 extern suspend_state_t pm_autosleep_state(void); 281 extern int pm_autosleep_set_state(suspend_state_t state); 282 283 #else /* !CONFIG_PM_AUTOSLEEP */ 284 285 static inline int pm_autosleep_init(void) { return 0; } 286 static inline int pm_autosleep_lock(void) { return 0; } 287 static inline void pm_autosleep_unlock(void) {} 288 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; } 289 290 #endif /* !CONFIG_PM_AUTOSLEEP */ 291 292 #ifdef CONFIG_PM_WAKELOCKS 293 294 /* kernel/power/wakelock.c */ 295 extern ssize_t pm_show_wakelocks(char *buf, bool show_active); 296 extern int pm_wake_lock(const char *buf); 297 extern int pm_wake_unlock(const char *buf); 298 299 #endif /* !CONFIG_PM_WAKELOCKS */ 300