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 int create_basic_memory_bitmaps(void);
  89 extern void free_basic_memory_bitmaps(void);
  90 extern int hibernate_preallocate_memory(void);
  91
  92 /**
  93  *      Auxiliary structure used for reading the snapshot image data and
  94  *      metadata from and writing them to the list of page backup entries
  95  *      (PBEs) which is the main data structure of swsusp.
  96  *
  97  *      Using struct snapshot_handle we can transfer the image, including its
  98  *      metadata, as a continuous sequence of bytes with the help of
  99  *      snapshot_read_next() and snapshot_write_next().
 100  *
 101  *      The code that writes the image to a storage or transfers it to
 102  *      the user land is required to use snapshot_read_next() for this
 103  *      purpose and it should not make any assumptions regarding the internal
 104  *      structure of the image.  Similarly, the code that reads the image from
 105  *      a storage or transfers it from the user land is required to use
 106  *      snapshot_write_next().
 107  *
 108  *      This may allow us to change the internal structure of the image
 109  *      in the future with considerably less effort.
 110  */
 111
 112 struct snapshot_handle {
 113         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
 114                                  * next operation will refer to (ie. current)
 115                                  */
 116         void            *buffer;        /* address of the block to read from
 117                                          * or write to
 118                                          */
 119         int             sync_read;      /* Set to one to notify the caller of
 120                                          * snapshot_write_next() that it may
 121                                          * need to call wait_on_bio_chain()
 122                                          */
 123 };
 124
 125 /* This macro returns the address from/to which the caller of
 126  * snapshot_read_next()/snapshot_write_next() is allowed to
 127  * read/write data after the function returns
 128  */
 129 #define data_of(handle) ((handle).buffer)
 130
 131 extern unsigned int snapshot_additional_pages(struct zone *zone);
 132 extern unsigned long snapshot_get_image_size(void);
 133 extern int snapshot_read_next(struct snapshot_handle *handle);
 134 extern int snapshot_write_next(struct snapshot_handle *handle);
 135 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 136 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 137
 138 /* If unset, the snapshot device cannot be open. */
 139 extern atomic_t snapshot_device_available;
 140
 141 extern sector_t alloc_swapdev_block(int swap);
 142 extern void free_all_swap_pages(int swap);
 143 extern int swsusp_swap_in_use(void);
 144
 145 /*
 146  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 147  * the image header.
 148  */
 149 #define SF_PLATFORM_MODE        1
 150 #define SF_NOCOMPRESS_MODE      2
 151 #define SF_CRC32_MODE           4
 152
 153 /* kernel/power/hibernate.c */
 154 extern int swsusp_check(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(fmode_t);
 159 #ifdef CONFIG_SUSPEND
 160 extern int swsusp_unmark(void);
 161 #endif
 162
 163 struct timeval;
 164 /* kernel/power/swsusp.c */
 165 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 166
 167 #ifdef CONFIG_SUSPEND
 168 /* kernel/power/suspend.c */
 169 extern const char *pm_labels[];
 170 extern const char *pm_states[];
 171
 172 extern int suspend_devices_and_enter(suspend_state_t state);
 173 #else /* !CONFIG_SUSPEND */
 174 static inline int suspend_devices_and_enter(suspend_state_t state)
 175 {
 176         return -ENOSYS;
 177 }
 178 #endif /* !CONFIG_SUSPEND */
 179
 180 #ifdef CONFIG_PM_TEST_SUSPEND
 181 /* kernel/power/suspend_test.c */
 182 extern void suspend_test_start(void);
 183 extern void suspend_test_finish(const char *label);
 184 #else /* !CONFIG_PM_TEST_SUSPEND */
 185 static inline void suspend_test_start(void) {}
 186 static inline void suspend_test_finish(const char *label) {}
 187 #endif /* !CONFIG_PM_TEST_SUSPEND */
 188
 189 #ifdef CONFIG_PM_SLEEP
 190 /* kernel/power/main.c */
 191 extern int pm_notifier_call_chain(unsigned long val);
 192 #endif
 193
 194 #ifdef CONFIG_HIGHMEM
 195 int restore_highmem(void);
 196 #else
 197 static inline unsigned int count_highmem_pages(void) { return 0; }
 198 static inline int restore_highmem(void) { return 0; }
 199 #endif
 200
 201 /*
 202  * Suspend test levels
 203  */
 204 enum {
 205         /* keep first */
 206         TEST_NONE,
 207         TEST_CORE,
 208         TEST_CPUS,
 209         TEST_PLATFORM,
 210         TEST_DEVICES,
 211         TEST_FREEZER,
 212         /* keep last */
 213         __TEST_AFTER_LAST
 214 };
 215
 216 #define TEST_FIRST      TEST_NONE
 217 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 218
 219 extern int pm_test_level;
 220
 221 #ifdef CONFIG_SUSPEND_FREEZER
 222 static inline int suspend_freeze_processes(void)
 223 {
 224         int error;
 225
 226         error = freeze_processes();
 227         /*
 228          * freeze_processes() automatically thaws every task if freezing
 229          * fails. So we need not do anything extra upon error.
 230          */
 231         if (error)
 232                 return error;
 233
 234         error = freeze_kernel_threads();
 235         /*
 236          * freeze_kernel_threads() thaws only kernel threads upon freezing
 237          * failure. So we have to thaw the userspace tasks ourselves.
 238          */
 239         if (error)
 240                 thaw_processes();
 241
 242         return error;
 243 }
 244
 245 static inline void suspend_thaw_processes(void)
 246 {
 247         thaw_processes();
 248 }
 249 #else
 250 static inline int suspend_freeze_processes(void)
 251 {
 252         return 0;
 253 }
 254
 255 static inline void suspend_thaw_processes(void)
 256 {
 257 }
 258 #endif
 259
 260 #ifdef CONFIG_PM_AUTOSLEEP
 261
 262 /* kernel/power/autosleep.c */
 263 extern int pm_autosleep_init(void);
 264 extern int pm_autosleep_lock(void);
 265 extern void pm_autosleep_unlock(void);
 266 extern suspend_state_t pm_autosleep_state(void);
 267 extern int pm_autosleep_set_state(suspend_state_t state);
 268
 269 #else /* !CONFIG_PM_AUTOSLEEP */
 270
 271 static inline int pm_autosleep_init(void) { return 0; }
 272 static inline int pm_autosleep_lock(void) { return 0; }
 273 static inline void pm_autosleep_unlock(void) {}
 274 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 275
 276 #endif /* !CONFIG_PM_AUTOSLEEP */
 277
 278 #ifdef CONFIG_PM_WAKELOCKS
 279
 280 /* kernel/power/wakelock.c */
 281 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 282 extern int pm_wake_lock(const char *buf);
 283 extern int pm_wake_unlock(const char *buf);
 284
 285 #endif /* !CONFIG_PM_WAKELOCKS */