kernel/power/power.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/suspend.h>
   3 #include <linux/suspend_ioctls.h>
   4 #include <linux/utsname.h>
   5 #include <linux/freezer.h>
   6 #include <linux/compiler.h>
   7
   8 struct swsusp_info {
   9         struct new_utsname      uts;
  10         u32                     version_code;
  11         unsigned long           num_physpages;
  12         int                     cpus;
  13         unsigned long           image_pages;
  14         unsigned long           pages;
  15         unsigned long           size;
  16 } __aligned(PAGE_SIZE);
  17
  18 #ifdef CONFIG_HIBERNATION
  19 /* kernel/power/snapshot.c */
  20 extern void __init hibernate_reserved_size_init(void);
  21 extern void __init hibernate_image_size_init(void);
  22
  23 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
  24 /* Maximum size of architecture specific data in a hibernation header */
  25 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
  26
  27 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
  28 extern int arch_hibernation_header_restore(void *addr);
  29
  30 static inline int init_header_complete(struct swsusp_info *info)
  31 {
  32         return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
  33 }
  34
  35 static inline char *check_image_kernel(struct swsusp_info *info)
  36 {
  37         return arch_hibernation_header_restore(info) ?
  38                         "architecture specific data" : NULL;
  39 }
  40 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
  41
  42 extern int hibernate_resume_nonboot_cpu_disable(void);
  43
  44 /*
  45  * Keep some memory free so that I/O operations can succeed without paging
  46  * [Might this be more than 4 MB?]
  47  */
  48 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
  49
  50 /*
  51  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  52  * their .suspend() routines without breaking the suspend to disk.
  53  */
  54 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
  55
  56 asmlinkage int swsusp_save(void);
  57
  58 /* kernel/power/hibernate.c */
  59 extern bool freezer_test_done;
  60
  61 extern int hibernation_snapshot(int platform_mode);
  62 extern int hibernation_restore(int platform_mode);
  63 extern int hibernation_platform_enter(void);
  64
  65 #ifdef CONFIG_STRICT_KERNEL_RWX
  66 /* kernel/power/snapshot.c */
  67 extern void enable_restore_image_protection(void);
  68 #else
  69 static inline void enable_restore_image_protection(void) {}
  70 #endif /* CONFIG_STRICT_KERNEL_RWX */
  71
  72 #else /* !CONFIG_HIBERNATION */
  73
  74 static inline void hibernate_reserved_size_init(void) {}
  75 static inline void hibernate_image_size_init(void) {}
  76 #endif /* !CONFIG_HIBERNATION */
  77
  78 extern int pfn_is_nosave(unsigned long);
  79
  80 #define power_attr(_name) \
  81 static struct kobj_attribute _name##_attr = {   \
  82         .attr   = {                             \
  83                 .name = __stringify(_name),     \
  84                 .mode = 0644,                   \
  85         },                                      \
  86         .show   = _name##_show,                 \
  87         .store  = _name##_store,                \
  88 }
  89
  90 #define power_attr_ro(_name) \
  91 static struct kobj_attribute _name##_attr = {   \
  92         .attr   = {                             \
  93                 .name = __stringify(_name),     \
  94                 .mode = S_IRUGO,                \
  95         },                                      \
  96         .show   = _name##_show,                 \
  97 }
  98
  99 /* Preferred image size in bytes (default 500 MB) */
 100 extern unsigned long image_size;
 101 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
 102 extern unsigned long reserved_size;
 103 extern int in_suspend;
 104 extern dev_t swsusp_resume_device;
 105 extern sector_t swsusp_resume_block;
 106
 107 extern int create_basic_memory_bitmaps(void);
 108 extern void free_basic_memory_bitmaps(void);
 109 extern int hibernate_preallocate_memory(void);
 110
 111 extern void clear_free_pages(void);
 112
 113 /**
 114  *      Auxiliary structure used for reading the snapshot image data and
 115  *      metadata from and writing them to the list of page backup entries
 116  *      (PBEs) which is the main data structure of swsusp.
 117  *
 118  *      Using struct snapshot_handle we can transfer the image, including its
 119  *      metadata, as a continuous sequence of bytes with the help of
 120  *      snapshot_read_next() and snapshot_write_next().
 121  *
 122  *      The code that writes the image to a storage or transfers it to
 123  *      the user land is required to use snapshot_read_next() for this
 124  *      purpose and it should not make any assumptions regarding the internal
 125  *      structure of the image.  Similarly, the code that reads the image from
 126  *      a storage or transfers it from the user land is required to use
 127  *      snapshot_write_next().
 128  *
 129  *      This may allow us to change the internal structure of the image
 130  *      in the future with considerably less effort.
 131  */
 132
 133 struct snapshot_handle {
 134         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
 135                                  * next operation will refer to (ie. current)
 136                                  */
 137         void            *buffer;        /* address of the block to read from
 138                                          * or write to
 139                                          */
 140         int             sync_read;      /* Set to one to notify the caller of
 141                                          * snapshot_write_next() that it may
 142                                          * need to call wait_on_bio_chain()
 143                                          */
 144 };
 145
 146 /* This macro returns the address from/to which the caller of
 147  * snapshot_read_next()/snapshot_write_next() is allowed to
 148  * read/write data after the function returns
 149  */
 150 #define data_of(handle) ((handle).buffer)
 151
 152 extern unsigned int snapshot_additional_pages(struct zone *zone);
 153 extern unsigned long snapshot_get_image_size(void);
 154 extern int snapshot_read_next(struct snapshot_handle *handle);
 155 extern int snapshot_write_next(struct snapshot_handle *handle);
 156 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 157 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 158
 159 /* If unset, the snapshot device cannot be open. */
 160 extern atomic_t snapshot_device_available;
 161
 162 extern sector_t alloc_swapdev_block(int swap);
 163 extern void free_all_swap_pages(int swap);
 164 extern int swsusp_swap_in_use(void);
 165
 166 /*
 167  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 168  * the image header.
 169  */
 170 #define SF_PLATFORM_MODE        1
 171 #define SF_NOCOMPRESS_MODE      2
 172 #define SF_CRC32_MODE           4
 173
 174 /* kernel/power/hibernate.c */
 175 extern int swsusp_check(void);
 176 extern void swsusp_free(void);
 177 extern int swsusp_read(unsigned int *flags_p);
 178 extern int swsusp_write(unsigned int flags);
 179 extern void swsusp_close(fmode_t);
 180 #ifdef CONFIG_SUSPEND
 181 extern int swsusp_unmark(void);
 182 #endif
 183
 184 struct timeval;
 185 /* kernel/power/swsusp.c */
 186 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 187
 188 #ifdef CONFIG_SUSPEND
 189 /* kernel/power/suspend.c */
 190 extern const char * const pm_labels[];
 191 extern const char *pm_states[];
 192 extern const char *mem_sleep_states[];
 193
 194 extern int suspend_devices_and_enter(suspend_state_t state);
 195 #else /* !CONFIG_SUSPEND */
 196 #define mem_sleep_current       PM_SUSPEND_ON
 197
 198 static inline int suspend_devices_and_enter(suspend_state_t state)
 199 {
 200         return -ENOSYS;
 201 }
 202 #endif /* !CONFIG_SUSPEND */
 203
 204 #ifdef CONFIG_PM_TEST_SUSPEND
 205 /* kernel/power/suspend_test.c */
 206 extern void suspend_test_start(void);
 207 extern void suspend_test_finish(const char *label);
 208 #else /* !CONFIG_PM_TEST_SUSPEND */
 209 static inline void suspend_test_start(void) {}
 210 static inline void suspend_test_finish(const char *label) {}
 211 #endif /* !CONFIG_PM_TEST_SUSPEND */
 212
 213 #ifdef CONFIG_PM_SLEEP
 214 /* kernel/power/main.c */
 215 extern int __pm_notifier_call_chain(unsigned long val, int nr_to_call,
 216                                     int *nr_calls);
 217 extern int pm_notifier_call_chain(unsigned long val);
 218 #endif
 219
 220 #ifdef CONFIG_HIGHMEM
 221 int restore_highmem(void);
 222 #else
 223 static inline unsigned int count_highmem_pages(void) { return 0; }
 224 static inline int restore_highmem(void) { return 0; }
 225 #endif
 226
 227 /*
 228  * Suspend test levels
 229  */
 230 enum {
 231         /* keep first */
 232         TEST_NONE,
 233         TEST_CORE,
 234         TEST_CPUS,
 235         TEST_PLATFORM,
 236         TEST_DEVICES,
 237         TEST_FREEZER,
 238         /* keep last */
 239         __TEST_AFTER_LAST
 240 };
 241
 242 #define TEST_FIRST      TEST_NONE
 243 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 244
 245 #ifdef CONFIG_PM_SLEEP_DEBUG
 246 extern int pm_test_level;
 247 #else
 248 #define pm_test_level   (TEST_NONE)
 249 #endif
 250
 251 #ifdef CONFIG_SUSPEND_FREEZER
 252 static inline int suspend_freeze_processes(void)
 253 {
 254         int error;
 255
 256         error = freeze_processes();
 257         /*
 258          * freeze_processes() automatically thaws every task if freezing
 259          * fails. So we need not do anything extra upon error.
 260          */
 261         if (error)
 262                 return error;
 263
 264         error = freeze_kernel_threads();
 265         /*
 266          * freeze_kernel_threads() thaws only kernel threads upon freezing
 267          * failure. So we have to thaw the userspace tasks ourselves.
 268          */
 269         if (error)
 270                 thaw_processes();
 271
 272         return error;
 273 }
 274
 275 static inline void suspend_thaw_processes(void)
 276 {
 277         thaw_processes();
 278 }
 279 #else
 280 static inline int suspend_freeze_processes(void)
 281 {
 282         return 0;
 283 }
 284
 285 static inline void suspend_thaw_processes(void)
 286 {
 287 }
 288 #endif
 289
 290 #ifdef CONFIG_PM_AUTOSLEEP
 291
 292 /* kernel/power/autosleep.c */
 293 extern int pm_autosleep_init(void);
 294 extern int pm_autosleep_lock(void);
 295 extern void pm_autosleep_unlock(void);
 296 extern suspend_state_t pm_autosleep_state(void);
 297 extern int pm_autosleep_set_state(suspend_state_t state);
 298
 299 #else /* !CONFIG_PM_AUTOSLEEP */
 300
 301 static inline int pm_autosleep_init(void) { return 0; }
 302 static inline int pm_autosleep_lock(void) { return 0; }
 303 static inline void pm_autosleep_unlock(void) {}
 304 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 305
 306 #endif /* !CONFIG_PM_AUTOSLEEP */
 307
 308 #ifdef CONFIG_PM_WAKELOCKS
 309
 310 /* kernel/power/wakelock.c */
 311 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 312 extern int pm_wake_lock(const char *buf);
 313 extern int pm_wake_unlock(const char *buf);
 314
 315 #endif /* !CONFIG_PM_WAKELOCKS */