linux/kernel/power/power.h
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   1#include <linux/suspend.h>
   2#include <linux/suspend_ioctls.h>
   3#include <linux/utsname.h>
   4#include <linux/freezer.h>
   5
   6struct 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 */
  18extern void __init hibernate_reserved_size_init(void);
  19extern void __init hibernate_image_size_init(void);
  20
  21#ifdef CONFIG_ARCH_HIBERNATION_HEADER
  22/* Maximum size of architecture specific data in a hibernation header */
  23#define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
  24
  25extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
  26extern int arch_hibernation_header_restore(void *addr);
  27
  28static inline int init_header_complete(struct swsusp_info *info)
  29{
  30        return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
  31}
  32
  33static inline char *check_image_kernel(struct swsusp_info *info)
  34{
  35        return arch_hibernation_header_restore(info) ?
  36                        "architecture specific data" : NULL;
  37}
  38#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
  39
  40/*
  41 * Keep some memory free so that I/O operations can succeed without paging
  42 * [Might this be more than 4 MB?]
  43 */
  44#define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
  45
  46/*
  47 * Keep 1 MB of memory free so that device drivers can allocate some pages in
  48 * their .suspend() routines without breaking the suspend to disk.
  49 */
  50#define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
  51
  52/* kernel/power/hibernate.c */
  53extern bool freezer_test_done;
  54
  55extern int hibernation_snapshot(int platform_mode);
  56extern int hibernation_restore(int platform_mode);
  57extern int hibernation_platform_enter(void);
  58
  59#else /* !CONFIG_HIBERNATION */
  60
  61static inline void hibernate_reserved_size_init(void) {}
  62static inline void hibernate_image_size_init(void) {}
  63#endif /* !CONFIG_HIBERNATION */
  64
  65extern int pfn_is_nosave(unsigned long);
  66
  67#define power_attr(_name) \
  68static struct kobj_attribute _name##_attr = {   \
  69        .attr   = {                             \
  70                .name = __stringify(_name),     \
  71                .mode = 0644,                   \
  72        },                                      \
  73        .show   = _name##_show,                 \
  74        .store  = _name##_store,                \
  75}
  76
  77/* Preferred image size in bytes (default 500 MB) */
  78extern unsigned long image_size;
  79/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
  80extern unsigned long reserved_size;
  81extern int in_suspend;
  82extern dev_t swsusp_resume_device;
  83extern sector_t swsusp_resume_block;
  84
  85extern asmlinkage int swsusp_arch_suspend(void);
  86extern asmlinkage int swsusp_arch_resume(void);
  87
  88extern int create_basic_memory_bitmaps(void);
  89extern void free_basic_memory_bitmaps(void);
  90extern 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
 112struct 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
 131extern unsigned int snapshot_additional_pages(struct zone *zone);
 132extern unsigned long snapshot_get_image_size(void);
 133extern int snapshot_read_next(struct snapshot_handle *handle);
 134extern int snapshot_write_next(struct snapshot_handle *handle);
 135extern void snapshot_write_finalize(struct snapshot_handle *handle);
 136extern int snapshot_image_loaded(struct snapshot_handle *handle);
 137
 138/* If unset, the snapshot device cannot be open. */
 139extern atomic_t snapshot_device_available;
 140
 141extern sector_t alloc_swapdev_block(int swap);
 142extern void free_all_swap_pages(int swap);
 143extern 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 */
 154extern int swsusp_check(void);
 155extern void swsusp_free(void);
 156extern int swsusp_read(unsigned int *flags_p);
 157extern int swsusp_write(unsigned int flags);
 158extern void swsusp_close(fmode_t);
 159#ifdef CONFIG_SUSPEND
 160extern int swsusp_unmark(void);
 161#endif
 162
 163/* kernel/power/block_io.c */
 164extern struct block_device *hib_resume_bdev;
 165
 166extern int hib_bio_read_page(pgoff_t page_off, void *addr,
 167                struct bio **bio_chain);
 168extern int hib_bio_write_page(pgoff_t page_off, void *addr,
 169                struct bio **bio_chain);
 170extern int hib_wait_on_bio_chain(struct bio **bio_chain);
 171
 172struct timeval;
 173/* kernel/power/swsusp.c */
 174extern void swsusp_show_speed(struct timeval *, struct timeval *,
 175                                unsigned int, char *);
 176
 177#ifdef CONFIG_SUSPEND
 178/* kernel/power/suspend.c */
 179extern const char *const pm_states[];
 180
 181extern bool valid_state(suspend_state_t state);
 182extern int suspend_devices_and_enter(suspend_state_t state);
 183#else /* !CONFIG_SUSPEND */
 184static inline int suspend_devices_and_enter(suspend_state_t state)
 185{
 186        return -ENOSYS;
 187}
 188static inline bool valid_state(suspend_state_t state) { return false; }
 189#endif /* !CONFIG_SUSPEND */
 190
 191#ifdef CONFIG_PM_TEST_SUSPEND
 192/* kernel/power/suspend_test.c */
 193extern void suspend_test_start(void);
 194extern void suspend_test_finish(const char *label);
 195#else /* !CONFIG_PM_TEST_SUSPEND */
 196static inline void suspend_test_start(void) {}
 197static inline void suspend_test_finish(const char *label) {}
 198#endif /* !CONFIG_PM_TEST_SUSPEND */
 199
 200#ifdef CONFIG_PM_SLEEP
 201/* kernel/power/main.c */
 202extern int pm_notifier_call_chain(unsigned long val);
 203#endif
 204
 205#ifdef CONFIG_HIGHMEM
 206int restore_highmem(void);
 207#else
 208static inline unsigned int count_highmem_pages(void) { return 0; }
 209static inline int restore_highmem(void) { return 0; }
 210#endif
 211
 212/*
 213 * Suspend test levels
 214 */
 215enum {
 216        /* keep first */
 217        TEST_NONE,
 218        TEST_CORE,
 219        TEST_CPUS,
 220        TEST_PLATFORM,
 221        TEST_DEVICES,
 222        TEST_FREEZER,
 223        /* keep last */
 224        __TEST_AFTER_LAST
 225};
 226
 227#define TEST_FIRST      TEST_NONE
 228#define TEST_MAX        (__TEST_AFTER_LAST - 1)
 229
 230extern int pm_test_level;
 231
 232#ifdef CONFIG_SUSPEND_FREEZER
 233static inline int suspend_freeze_processes(void)
 234{
 235        int error;
 236
 237        error = freeze_processes();
 238        /*
 239         * freeze_processes() automatically thaws every task if freezing
 240         * fails. So we need not do anything extra upon error.
 241         */
 242        if (error)
 243                return error;
 244
 245        error = freeze_kernel_threads();
 246        /*
 247         * freeze_kernel_threads() thaws only kernel threads upon freezing
 248         * failure. So we have to thaw the userspace tasks ourselves.
 249         */
 250        if (error)
 251                thaw_processes();
 252
 253        return error;
 254}
 255
 256static inline void suspend_thaw_processes(void)
 257{
 258        thaw_processes();
 259}
 260#else
 261static inline int suspend_freeze_processes(void)
 262{
 263        return 0;
 264}
 265
 266static inline void suspend_thaw_processes(void)
 267{
 268}
 269#endif
 270
 271#ifdef CONFIG_PM_AUTOSLEEP
 272
 273/* kernel/power/autosleep.c */
 274extern int pm_autosleep_init(void);
 275extern int pm_autosleep_lock(void);
 276extern void pm_autosleep_unlock(void);
 277extern suspend_state_t pm_autosleep_state(void);
 278extern int pm_autosleep_set_state(suspend_state_t state);
 279
 280#else /* !CONFIG_PM_AUTOSLEEP */
 281
 282static inline int pm_autosleep_init(void) { return 0; }
 283static inline int pm_autosleep_lock(void) { return 0; }
 284static inline void pm_autosleep_unlock(void) {}
 285static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 286
 287#endif /* !CONFIG_PM_AUTOSLEEP */
 288
 289#ifdef CONFIG_PM_WAKELOCKS
 290
 291/* kernel/power/wakelock.c */
 292extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 293extern int pm_wake_lock(const char *buf);
 294extern int pm_wake_unlock(const char *buf);
 295
 296#endif /* !CONFIG_PM_WAKELOCKS */
 297
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