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 #include <linux/cpu.h>
   8 #include <linux/cpuidle.h>
   9 #include <linux/crypto.h>
  10
  11 struct swsusp_info {
  12         struct new_utsname      uts;
  13         u32                     version_code;
  14         unsigned long           num_physpages;
  15         int                     cpus;
  16         unsigned long           image_pages;
  17         unsigned long           pages;
  18         unsigned long           size;
  19 } __aligned(PAGE_SIZE);
  20
  21 #ifdef CONFIG_HIBERNATION
  22 /* kernel/power/snapshot.c */
  23 extern void __init hibernate_reserved_size_init(void);
  24 extern void __init hibernate_image_size_init(void);
  25
  26 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
  27 /* Maximum size of architecture specific data in a hibernation header */
  28 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
  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 const 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 /*
  43  * Keep some memory free so that I/O operations can succeed without paging
  44  * [Might this be more than 4 MB?]
  45  */
  46 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
  47
  48 /*
  49  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  50  * their .suspend() routines without breaking the suspend to disk.
  51  */
  52 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
  53
  54 asmlinkage int swsusp_save(void);
  55
  56 /* kernel/power/hibernate.c */
  57 extern bool freezer_test_done;
  58 extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
  59
  60 /* kernel/power/swap.c */
  61 extern unsigned int swsusp_header_flags;
  62
  63 extern int hibernation_snapshot(int platform_mode);
  64 extern int hibernation_restore(int platform_mode);
  65 extern int hibernation_platform_enter(void);
  66
  67 #ifdef CONFIG_STRICT_KERNEL_RWX
  68 /* kernel/power/snapshot.c */
  69 extern void enable_restore_image_protection(void);
  70 #else
  71 static inline void enable_restore_image_protection(void) {}
  72 #endif /* CONFIG_STRICT_KERNEL_RWX */
  73
  74 #else /* !CONFIG_HIBERNATION */
  75
  76 static inline void hibernate_reserved_size_init(void) {}
  77 static inline void hibernate_image_size_init(void) {}
  78 #endif /* !CONFIG_HIBERNATION */
  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_or_poison_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 int snapshot_write_finalize(struct snapshot_handle *handle);
 157 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 158
 159 extern bool hibernate_acquire(void);
 160 extern void hibernate_release(void);
 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_COMPRESSION_ALG_LZO  0 /* dummy, details given  below */
 171 #define SF_PLATFORM_MODE        1
 172 #define SF_NOCOMPRESS_MODE      2
 173 #define SF_CRC32_MODE           4
 174 #define SF_HW_SIG               8
 175
 176 /*
 177  * Bit to indicate the compression algorithm to be used(for LZ4). The same
 178  * could be checked while saving/loading image to/from disk to use the
 179  * corresponding algorithms.
 180  *
 181  * By default, LZO compression is enabled if SF_CRC32_MODE is set. Use
 182  * SF_COMPRESSION_ALG_LZ4 to override this behaviour and use LZ4.
 183  *
 184  * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZO(dummy) -> Compression, LZO
 185  * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZ4 -> Compression, LZ4
 186  */
 187 #define SF_COMPRESSION_ALG_LZ4  16
 188
 189 /* kernel/power/hibernate.c */
 190 int swsusp_check(bool exclusive);
 191 extern void swsusp_free(void);
 192 extern int swsusp_read(unsigned int *flags_p);
 193 extern int swsusp_write(unsigned int flags);
 194 void swsusp_close(void);
 195 #ifdef CONFIG_SUSPEND
 196 extern int swsusp_unmark(void);
 197 #else
 198 static inline int swsusp_unmark(void) { return 0; }
 199 #endif
 200
 201 struct __kernel_old_timeval;
 202 /* kernel/power/swsusp.c */
 203 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 204
 205 #ifdef CONFIG_SUSPEND
 206 /* kernel/power/suspend.c */
 207 extern const char * const pm_labels[];
 208 extern const char *pm_states[];
 209 extern const char *mem_sleep_states[];
 210
 211 extern int suspend_devices_and_enter(suspend_state_t state);
 212 #else /* !CONFIG_SUSPEND */
 213 #define mem_sleep_current       PM_SUSPEND_ON
 214
 215 static inline int suspend_devices_and_enter(suspend_state_t state)
 216 {
 217         return -ENOSYS;
 218 }
 219 #endif /* !CONFIG_SUSPEND */
 220
 221 #ifdef CONFIG_PM_TEST_SUSPEND
 222 /* kernel/power/suspend_test.c */
 223 extern void suspend_test_start(void);
 224 extern void suspend_test_finish(const char *label);
 225 #else /* !CONFIG_PM_TEST_SUSPEND */
 226 static inline void suspend_test_start(void) {}
 227 static inline void suspend_test_finish(const char *label) {}
 228 #endif /* !CONFIG_PM_TEST_SUSPEND */
 229
 230 #ifdef CONFIG_PM_SLEEP
 231 /* kernel/power/main.c */
 232 extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
 233 extern int pm_notifier_call_chain(unsigned long val);
 234 void pm_restrict_gfp_mask(void);
 235 void pm_restore_gfp_mask(void);
 236 #else
 237 static inline void pm_restrict_gfp_mask(void) {}
 238 static inline void pm_restore_gfp_mask(void) {}
 239 #endif
 240
 241 #ifdef CONFIG_HIGHMEM
 242 int restore_highmem(void);
 243 #else
 244 static inline unsigned int count_highmem_pages(void) { return 0; }
 245 static inline int restore_highmem(void) { return 0; }
 246 #endif
 247
 248 /*
 249  * Suspend test levels
 250  */
 251 enum {
 252         /* keep first */
 253         TEST_NONE,
 254         TEST_CORE,
 255         TEST_CPUS,
 256         TEST_PLATFORM,
 257         TEST_DEVICES,
 258         TEST_FREEZER,
 259         /* keep last */
 260         __TEST_AFTER_LAST
 261 };
 262
 263 #define TEST_FIRST      TEST_NONE
 264 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
 265
 266 #ifdef CONFIG_PM_SLEEP_DEBUG
 267 extern int pm_test_level;
 268 #else
 269 #define pm_test_level   (TEST_NONE)
 270 #endif
 271
 272 #ifdef CONFIG_SUSPEND_FREEZER
 273 static inline int suspend_freeze_processes(void)
 274 {
 275         int error;
 276
 277         error = freeze_processes();
 278         /*
 279          * freeze_processes() automatically thaws every task if freezing
 280          * fails. So we need not do anything extra upon error.
 281          */
 282         if (error)
 283                 return error;
 284
 285         error = freeze_kernel_threads();
 286         /*
 287          * freeze_kernel_threads() thaws only kernel threads upon freezing
 288          * failure. So we have to thaw the userspace tasks ourselves.
 289          */
 290         if (error)
 291                 thaw_processes();
 292
 293         return error;
 294 }
 295
 296 static inline void suspend_thaw_processes(void)
 297 {
 298         thaw_processes();
 299 }
 300 #else
 301 static inline int suspend_freeze_processes(void)
 302 {
 303         return 0;
 304 }
 305
 306 static inline void suspend_thaw_processes(void)
 307 {
 308 }
 309 #endif
 310
 311 #ifdef CONFIG_PM_AUTOSLEEP
 312
 313 /* kernel/power/autosleep.c */
 314 extern int pm_autosleep_init(void);
 315 extern int pm_autosleep_lock(void);
 316 extern void pm_autosleep_unlock(void);
 317 extern suspend_state_t pm_autosleep_state(void);
 318 extern int pm_autosleep_set_state(suspend_state_t state);
 319
 320 #else /* !CONFIG_PM_AUTOSLEEP */
 321
 322 static inline int pm_autosleep_init(void) { return 0; }
 323 static inline int pm_autosleep_lock(void) { return 0; }
 324 static inline void pm_autosleep_unlock(void) {}
 325 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
 326
 327 #endif /* !CONFIG_PM_AUTOSLEEP */
 328
 329 #ifdef CONFIG_PM_WAKELOCKS
 330
 331 /* kernel/power/wakelock.c */
 332 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
 333 extern int pm_wake_lock(const char *buf);
 334 extern int pm_wake_unlock(const char *buf);
 335
 336 #endif /* !CONFIG_PM_WAKELOCKS */
 337
 338 static inline int pm_sleep_disable_secondary_cpus(void)
 339 {
 340         cpuidle_pause();
 341         return suspend_disable_secondary_cpus();
 342 }
 343
 344 static inline void pm_sleep_enable_secondary_cpus(void)
 345 {
 346         suspend_enable_secondary_cpus();
 347         cpuidle_resume();
 348 }
 349
 350 void dpm_save_errno(int err);