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