kernel/power/power.h

   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 struct pm_sleep_state {
 182         const char *label;
 183         suspend_state_t state;
 184 };
 185
 186 /* kernel/power/suspend.c */
 187 extern struct pm_sleep_state pm_states[];
 188
 189 extern int suspend_devices_and_enter(suspend_state_t state);
 190 #else /* !CONFIG_SUSPEND */
 191 static inline int suspend_devices_and_enter(suspend_state_t state)
 192 {
 193         return -ENOSYS;
 194 }
 195 #endif /* !CONFIG_SUSPEND */
 196
 197 #ifdef CONFIG_PM_TEST_SUSPEND
 198 /* kernel/power/suspend_test.c */
 199 extern void suspend_test_start(void);
 200 extern void suspend_test_finish(const char *label);
 201 #else /* !CONFIG_PM_TEST_SUSPEND */
 202 static inline void suspend_test_start(void) {}
 203 static inline void suspend_test_finish(const char *label) {}
 204 #endif /* !CONFIG_PM_TEST_SUSPEND */
 205
 206 #ifdef CONFIG_PM_SLEEP
 207 /* kernel/power/main.c */
 208 extern int pm_notifier_call_chain(unsigned long val);
 209 #endif
 210
 211 #ifdef CONFIG_HIGHMEM
 212 int restore_highmem(void);
 213 #else
 214 static inline unsigned int count_highmem_pages(void) { return 0; }
 215 static inline int restore_highmem(void) { return 0; }
 216 #endif
 217
 218 /*
 219  * Suspend test levels
 220  */
 221 enum {
 222         /* keep first */
 223         TEST_NONE,
 224         TEST_CORE,
 225         TEST_CPUS,
 226         TEST_PLATFORM,
 227         TEST_DEVICES,
 228         TEST_FREEZER,
 229         /* keep last */
 230         __TEST_AFTER_LAST
 231 };
 232
 233 #define TEST_FIRST      TEST_NONE
 234 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 235
 236 extern int pm_test_level;
 237
 238 #ifdef CONFIG_SUSPEND_FREEZER
 239 static inline int suspend_freeze_processes(void)
 240 {
 241         int error;
 242
 243         error = freeze_processes();
 244         /*
 245          * freeze_processes() automatically thaws every task if freezing
 246          * fails. So we need not do anything extra upon error.
 247          */
 248         if (error)
 249                 return error;
 250
 251         error = freeze_kernel_threads();
 252         /*
 253          * freeze_kernel_threads() thaws only kernel threads upon freezing
 254          * failure. So we have to thaw the userspace tasks ourselves.
 255          */
 256         if (error)
 257                 thaw_processes();
 258
 259         return error;
 260 }
 261
 262 static inline void suspend_thaw_processes(void)
 263 {
 264         thaw_processes();
 265 }
 266 #else
 267 static inline int suspend_freeze_processes(void)
 268 {
 269         return 0;
 270 }
 271
 272 static inline void suspend_thaw_processes(void)
 273 {
 274 }
 275 #endif
 276
 277 #ifdef CONFIG_PM_AUTOSLEEP
 278
 279 /* kernel/power/autosleep.c */
 280 extern int pm_autosleep_init(void);
 281 extern int pm_autosleep_lock(void);
 282 extern void pm_autosleep_unlock(void);
 283 extern suspend_state_t pm_autosleep_state(void);
 284 extern int pm_autosleep_set_state(suspend_state_t state);
 285
 286 #else /* !CONFIG_PM_AUTOSLEEP */
 287
 288 static inline int pm_autosleep_init(void) { return 0; }
 289 static inline int pm_autosleep_lock(void) { return 0; }
 290 static inline void pm_autosleep_unlock(void) {}
 291 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 292
 293 #endif /* !CONFIG_PM_AUTOSLEEP */
 294
 295 #ifdef CONFIG_PM_WAKELOCKS
 296
 297 /* kernel/power/wakelock.c */
 298 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 299 extern int pm_wake_lock(const char *buf);
 300 extern int pm_wake_unlock(const char *buf);
 301
 302 #endif /* !CONFIG_PM_WAKELOCKS */