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 extern int hibernate_resume_nonboot_cpu_disable(void);
  42
  43 /*
  44  * Keep some memory free so that I/O operations can succeed without paging
  45  * [Might this be more than 4 MB?]
  46  */
  47 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
  48
  49 /*
  50  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  51  * their .suspend() routines without breaking the suspend to disk.
  52  */
  53 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
  54
  55 asmlinkage int swsusp_save(void);
  56
  57 /* kernel/power/hibernate.c */
  58 extern bool freezer_test_done;
  59
  60 extern int hibernation_snapshot(int platform_mode);
  61 extern int hibernation_restore(int platform_mode);
  62 extern int hibernation_platform_enter(void);
  63
  64 #ifdef CONFIG_STRICT_KERNEL_RWX
  65 /* kernel/power/snapshot.c */
  66 extern void enable_restore_image_protection(void);
  67 #else
  68 static inline void enable_restore_image_protection(void) {}
  69 #endif /* CONFIG_STRICT_KERNEL_RWX */
  70
  71 #else /* !CONFIG_HIBERNATION */
  72
  73 static inline void hibernate_reserved_size_init(void) {}
  74 static inline void hibernate_image_size_init(void) {}
  75 #endif /* !CONFIG_HIBERNATION */
  76
  77 extern int pfn_is_nosave(unsigned long);
  78
  79 #define power_attr(_name) \
  80 static struct kobj_attribute _name##_attr = {   \
  81         .attr   = {                             \
  82                 .name = __stringify(_name),     \
  83                 .mode = 0644,                   \
  84         },                                      \
  85         .show   = _name##_show,                 \
  86         .store  = _name##_store,                \
  87 }
  88
  89 #define power_attr_ro(_name) \
  90 static struct kobj_attribute _name##_attr = {   \
  91         .attr   = {                             \
  92                 .name = __stringify(_name),     \
  93                 .mode = S_IRUGO,                \
  94         },                                      \
  95         .show   = _name##_show,                 \
  96 }
  97
  98 /* Preferred image size in bytes (default 500 MB) */
  99 extern unsigned long image_size;
 100 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
 101 extern unsigned long reserved_size;
 102 extern int in_suspend;
 103 extern dev_t swsusp_resume_device;
 104 extern sector_t swsusp_resume_block;
 105
 106 extern asmlinkage int swsusp_arch_suspend(void);
 107 extern asmlinkage int swsusp_arch_resume(void);
 108
 109 extern int create_basic_memory_bitmaps(void);
 110 extern void free_basic_memory_bitmaps(void);
 111 extern int hibernate_preallocate_memory(void);
 112
 113 extern void clear_free_pages(void);
 114
 115 /**
 116  *      Auxiliary structure used for reading the snapshot image data and
 117  *      metadata from and writing them to the list of page backup entries
 118  *      (PBEs) which is the main data structure of swsusp.
 119  *
 120  *      Using struct snapshot_handle we can transfer the image, including its
 121  *      metadata, as a continuous sequence of bytes with the help of
 122  *      snapshot_read_next() and snapshot_write_next().
 123  *
 124  *      The code that writes the image to a storage or transfers it to
 125  *      the user land is required to use snapshot_read_next() for this
 126  *      purpose and it should not make any assumptions regarding the internal
 127  *      structure of the image.  Similarly, the code that reads the image from
 128  *      a storage or transfers it from the user land is required to use
 129  *      snapshot_write_next().
 130  *
 131  *      This may allow us to change the internal structure of the image
 132  *      in the future with considerably less effort.
 133  */
 134
 135 struct snapshot_handle {
 136         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
 137                                  * next operation will refer to (ie. current)
 138                                  */
 139         void            *buffer;        /* address of the block to read from
 140                                          * or write to
 141                                          */
 142         int             sync_read;      /* Set to one to notify the caller of
 143                                          * snapshot_write_next() that it may
 144                                          * need to call wait_on_bio_chain()
 145                                          */
 146 };
 147
 148 /* This macro returns the address from/to which the caller of
 149  * snapshot_read_next()/snapshot_write_next() is allowed to
 150  * read/write data after the function returns
 151  */
 152 #define data_of(handle) ((handle).buffer)
 153
 154 extern unsigned int snapshot_additional_pages(struct zone *zone);
 155 extern unsigned long snapshot_get_image_size(void);
 156 extern int snapshot_read_next(struct snapshot_handle *handle);
 157 extern int snapshot_write_next(struct snapshot_handle *handle);
 158 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 159 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 160
 161 /* If unset, the snapshot device cannot be open. */
 162 extern atomic_t snapshot_device_available;
 163
 164 extern sector_t alloc_swapdev_block(int swap);
 165 extern void free_all_swap_pages(int swap);
 166 extern int swsusp_swap_in_use(void);
 167
 168 /*
 169  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 170  * the image header.
 171  */
 172 #define SF_PLATFORM_MODE        1
 173 #define SF_NOCOMPRESS_MODE      2
 174 #define SF_CRC32_MODE           4
 175
 176 /* kernel/power/hibernate.c */
 177 extern int swsusp_check(void);
 178 extern void swsusp_free(void);
 179 extern int swsusp_read(unsigned int *flags_p);
 180 extern int swsusp_write(unsigned int flags);
 181 extern void swsusp_close(fmode_t);
 182 #ifdef CONFIG_SUSPEND
 183 extern int swsusp_unmark(void);
 184 #endif
 185
 186 struct timeval;
 187 /* kernel/power/swsusp.c */
 188 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 189
 190 #ifdef CONFIG_SUSPEND
 191 /* kernel/power/suspend.c */
 192 extern const char * const pm_labels[];
 193 extern const char *pm_states[];
 194 extern const char *mem_sleep_states[];
 195 extern suspend_state_t mem_sleep_current;
 196
 197 extern int suspend_devices_and_enter(suspend_state_t state);
 198 #else /* !CONFIG_SUSPEND */
 199 #define mem_sleep_current       PM_SUSPEND_ON
 200
 201 static inline int suspend_devices_and_enter(suspend_state_t state)
 202 {
 203         return -ENOSYS;
 204 }
 205 #endif /* !CONFIG_SUSPEND */
 206
 207 #ifdef CONFIG_PM_TEST_SUSPEND
 208 /* kernel/power/suspend_test.c */
 209 extern void suspend_test_start(void);
 210 extern void suspend_test_finish(const char *label);
 211 #else /* !CONFIG_PM_TEST_SUSPEND */
 212 static inline void suspend_test_start(void) {}
 213 static inline void suspend_test_finish(const char *label) {}
 214 #endif /* !CONFIG_PM_TEST_SUSPEND */
 215
 216 #ifdef CONFIG_PM_SLEEP
 217 /* kernel/power/main.c */
 218 extern int __pm_notifier_call_chain(unsigned long val, int nr_to_call,
 219                                     int *nr_calls);
 220 extern int pm_notifier_call_chain(unsigned long val);
 221 #endif
 222
 223 #ifdef CONFIG_HIGHMEM
 224 int restore_highmem(void);
 225 #else
 226 static inline unsigned int count_highmem_pages(void) { return 0; }
 227 static inline int restore_highmem(void) { return 0; }
 228 #endif
 229
 230 /*
 231  * Suspend test levels
 232  */
 233 enum {
 234         /* keep first */
 235         TEST_NONE,
 236         TEST_CORE,
 237         TEST_CPUS,
 238         TEST_PLATFORM,
 239         TEST_DEVICES,
 240         TEST_FREEZER,
 241         /* keep last */
 242         __TEST_AFTER_LAST
 243 };
 244
 245 #define TEST_FIRST      TEST_NONE
 246 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 247
 248 extern int pm_test_level;
 249
 250 #ifdef CONFIG_SUSPEND_FREEZER
 251 static inline int suspend_freeze_processes(void)
 252 {
 253         int error;
 254
 255         error = freeze_processes();
 256         /*
 257          * freeze_processes() automatically thaws every task if freezing
 258          * fails. So we need not do anything extra upon error.
 259          */
 260         if (error)
 261                 return error;
 262
 263         error = freeze_kernel_threads();
 264         /*
 265          * freeze_kernel_threads() thaws only kernel threads upon freezing
 266          * failure. So we have to thaw the userspace tasks ourselves.
 267          */
 268         if (error)
 269                 thaw_processes();
 270
 271         return error;
 272 }
 273
 274 static inline void suspend_thaw_processes(void)
 275 {
 276         thaw_processes();
 277 }
 278 #else
 279 static inline int suspend_freeze_processes(void)
 280 {
 281         return 0;
 282 }
 283
 284 static inline void suspend_thaw_processes(void)
 285 {
 286 }
 287 #endif
 288
 289 #ifdef CONFIG_PM_AUTOSLEEP
 290
 291 /* kernel/power/autosleep.c */
 292 extern int pm_autosleep_init(void);
 293 extern int pm_autosleep_lock(void);
 294 extern void pm_autosleep_unlock(void);
 295 extern suspend_state_t pm_autosleep_state(void);
 296 extern int pm_autosleep_set_state(suspend_state_t state);
 297
 298 #else /* !CONFIG_PM_AUTOSLEEP */
 299
 300 static inline int pm_autosleep_init(void) { return 0; }
 301 static inline int pm_autosleep_lock(void) { return 0; }
 302 static inline void pm_autosleep_unlock(void) {}
 303 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 304
 305 #endif /* !CONFIG_PM_AUTOSLEEP */
 306
 307 #ifdef CONFIG_PM_WAKELOCKS
 308
 309 /* kernel/power/wakelock.c */
 310 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 311 extern int pm_wake_lock(const char *buf);
 312 extern int pm_wake_unlock(const char *buf);
 313
 314 #endif /* !CONFIG_PM_WAKELOCKS */