include/linux/suspend.h

   1 #ifndef _LINUX_SUSPEND_H
   2 #define _LINUX_SUSPEND_H
   3
   4 #include <linux/swap.h>
   5 #include <linux/notifier.h>
   6 #include <linux/init.h>
   7 #include <linux/pm.h>
   8 #include <linux/mm.h>
   9 #include <linux/freezer.h>
  10 #include <asm/errno.h>
  11
  12 #ifdef CONFIG_VT
  13 extern void pm_set_vt_switch(int);
  14 #else
  15 static inline void pm_set_vt_switch(int do_switch)
  16 {
  17 }
  18 #endif
  19
  20 #ifdef CONFIG_VT_CONSOLE_SLEEP
  21 extern int pm_prepare_console(void);
  22 extern void pm_restore_console(void);
  23 #else
  24 static inline int pm_prepare_console(void)
  25 {
  26         return 0;
  27 }
  28
  29 static inline void pm_restore_console(void)
  30 {
  31 }
  32 #endif
  33
  34 typedef int __bitwise suspend_state_t;
  35
  36 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
  37 #define PM_SUSPEND_FREEZE       ((__force suspend_state_t) 1)
  38 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 2)
  39 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
  40 #define PM_SUSPEND_MIN          PM_SUSPEND_FREEZE
  41 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 4)
  42
  43 enum suspend_stat_step {
  44         SUSPEND_FREEZE = 1,
  45         SUSPEND_PREPARE,
  46         SUSPEND_SUSPEND,
  47         SUSPEND_SUSPEND_LATE,
  48         SUSPEND_SUSPEND_NOIRQ,
  49         SUSPEND_RESUME_NOIRQ,
  50         SUSPEND_RESUME_EARLY,
  51         SUSPEND_RESUME
  52 };
  53
  54 struct suspend_stats {
  55         int     success;
  56         int     fail;
  57         int     failed_freeze;
  58         int     failed_prepare;
  59         int     failed_suspend;
  60         int     failed_suspend_late;
  61         int     failed_suspend_noirq;
  62         int     failed_resume;
  63         int     failed_resume_early;
  64         int     failed_resume_noirq;
  65 #define REC_FAILED_NUM  2
  66         int     last_failed_dev;
  67         char    failed_devs[REC_FAILED_NUM][40];
  68         int     last_failed_errno;
  69         int     errno[REC_FAILED_NUM];
  70         int     last_failed_step;
  71         enum suspend_stat_step  failed_steps[REC_FAILED_NUM];
  72 };
  73
  74 extern struct suspend_stats suspend_stats;
  75
  76 static inline void dpm_save_failed_dev(const char *name)
  77 {
  78         strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
  79                 name,
  80                 sizeof(suspend_stats.failed_devs[0]));
  81         suspend_stats.last_failed_dev++;
  82         suspend_stats.last_failed_dev %= REC_FAILED_NUM;
  83 }
  84
  85 static inline void dpm_save_failed_errno(int err)
  86 {
  87         suspend_stats.errno[suspend_stats.last_failed_errno] = err;
  88         suspend_stats.last_failed_errno++;
  89         suspend_stats.last_failed_errno %= REC_FAILED_NUM;
  90 }
  91
  92 static inline void dpm_save_failed_step(enum suspend_stat_step step)
  93 {
  94         suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
  95         suspend_stats.last_failed_step++;
  96         suspend_stats.last_failed_step %= REC_FAILED_NUM;
  97 }
  98
  99 /**
 100  * struct platform_suspend_ops - Callbacks for managing platform dependent
 101  *      system sleep states.
 102  *
 103  * @valid: Callback to determine if given system sleep state is supported by
 104  *      the platform.
 105  *      Valid (ie. supported) states are advertised in /sys/power/state.  Note
 106  *      that it still may be impossible to enter given system sleep state if the
 107  *      conditions aren't right.
 108  *      There is the %suspend_valid_only_mem function available that can be
 109  *      assigned to this if the platform only supports mem sleep.
 110  *
 111  * @begin: Initialise a transition to given system sleep state.
 112  *      @begin() is executed right prior to suspending devices.  The information
 113  *      conveyed to the platform code by @begin() should be disregarded by it as
 114  *      soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
 115  *      @prepare(), @enter() and @finish() will not be called by the PM core.
 116  *      This callback is optional.  However, if it is implemented, the argument
 117  *      passed to @enter() is redundant and should be ignored.
 118  *
 119  * @prepare: Prepare the platform for entering the system sleep state indicated
 120  *      by @begin().
 121  *      @prepare() is called right after devices have been suspended (ie. the
 122  *      appropriate .suspend() method has been executed for each device) and
 123  *      before device drivers' late suspend callbacks are executed.  It returns
 124  *      0 on success or a negative error code otherwise, in which case the
 125  *      system cannot enter the desired sleep state (@prepare_late(), @enter(),
 126  *      and @wake() will not be called in that case).
 127  *
 128  * @prepare_late: Finish preparing the platform for entering the system sleep
 129  *      state indicated by @begin().
 130  *      @prepare_late is called before disabling nonboot CPUs and after
 131  *      device drivers' late suspend callbacks have been executed.  It returns
 132  *      0 on success or a negative error code otherwise, in which case the
 133  *      system cannot enter the desired sleep state (@enter() will not be
 134  *      executed).
 135  *
 136  * @enter: Enter the system sleep state indicated by @begin() or represented by
 137  *      the argument if @begin() is not implemented.
 138  *      This callback is mandatory.  It returns 0 on success or a negative
 139  *      error code otherwise, in which case the system cannot enter the desired
 140  *      sleep state.
 141  *
 142  * @wake: Called when the system has just left a sleep state, right after
 143  *      the nonboot CPUs have been enabled and before device drivers' early
 144  *      resume callbacks are executed.
 145  *      This callback is optional, but should be implemented by the platforms
 146  *      that implement @prepare_late().  If implemented, it is always called
 147  *      after @prepare_late and @enter(), even if one of them fails.
 148  *
 149  * @finish: Finish wake-up of the platform.
 150  *      @finish is called right prior to calling device drivers' regular suspend
 151  *      callbacks.
 152  *      This callback is optional, but should be implemented by the platforms
 153  *      that implement @prepare().  If implemented, it is always called after
 154  *      @enter() and @wake(), even if any of them fails.  It is executed after
 155  *      a failing @prepare.
 156  *
 157  * @suspend_again: Returns whether the system should suspend again (true) or
 158  *      not (false). If the platform wants to poll sensors or execute some
 159  *      code during suspended without invoking userspace and most of devices,
 160  *      suspend_again callback is the place assuming that periodic-wakeup or
 161  *      alarm-wakeup is already setup. This allows to execute some codes while
 162  *      being kept suspended in the view of userland and devices.
 163  *
 164  * @end: Called by the PM core right after resuming devices, to indicate to
 165  *      the platform that the system has returned to the working state or
 166  *      the transition to the sleep state has been aborted.
 167  *      This callback is optional, but should be implemented by the platforms
 168  *      that implement @begin().  Accordingly, platforms implementing @begin()
 169  *      should also provide a @end() which cleans up transitions aborted before
 170  *      @enter().
 171  *
 172  * @recover: Recover the platform from a suspend failure.
 173  *      Called by the PM core if the suspending of devices fails.
 174  *      This callback is optional and should only be implemented by platforms
 175  *      which require special recovery actions in that situation.
 176  */
 177 struct platform_suspend_ops {
 178         int (*valid)(suspend_state_t state);
 179         int (*begin)(suspend_state_t state);
 180         int (*prepare)(void);
 181         int (*prepare_late)(void);
 182         int (*enter)(suspend_state_t state);
 183         void (*wake)(void);
 184         void (*finish)(void);
 185         bool (*suspend_again)(void);
 186         void (*end)(void);
 187         void (*recover)(void);
 188 };
 189
 190 struct platform_freeze_ops {
 191         int (*begin)(void);
 192         int (*prepare)(void);
 193         void (*restore)(void);
 194         void (*end)(void);
 195 };
 196
 197 #ifdef CONFIG_SUSPEND
 198 /**
 199  * suspend_set_ops - set platform dependent suspend operations
 200  * @ops: The new suspend operations to set.
 201  */
 202 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
 203 extern int suspend_valid_only_mem(suspend_state_t state);
 204
 205 extern unsigned int pm_suspend_global_flags;
 206
 207 #define PM_SUSPEND_FLAG_FW_SUSPEND      (1 << 0)
 208 #define PM_SUSPEND_FLAG_FW_RESUME       (1 << 1)
 209
 210 static inline void pm_suspend_clear_flags(void)
 211 {
 212         pm_suspend_global_flags = 0;
 213 }
 214
 215 static inline void pm_set_suspend_via_firmware(void)
 216 {
 217         pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
 218 }
 219
 220 static inline void pm_set_resume_via_firmware(void)
 221 {
 222         pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
 223 }
 224
 225 static inline bool pm_suspend_via_firmware(void)
 226 {
 227         return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
 228 }
 229
 230 static inline bool pm_resume_via_firmware(void)
 231 {
 232         return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
 233 }
 234
 235 /* Suspend-to-idle state machnine. */
 236 enum freeze_state {
 237         FREEZE_STATE_NONE,      /* Not suspended/suspending. */
 238         FREEZE_STATE_ENTER,     /* Enter suspend-to-idle. */
 239         FREEZE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
 240 };
 241
 242 extern enum freeze_state __read_mostly suspend_freeze_state;
 243
 244 static inline bool idle_should_freeze(void)
 245 {
 246         return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER);
 247 }
 248
 249 extern void freeze_set_ops(const struct platform_freeze_ops *ops);
 250 extern void freeze_wake(void);
 251
 252 /**
 253  * arch_suspend_disable_irqs - disable IRQs for suspend
 254  *
 255  * Disables IRQs (in the default case). This is a weak symbol in the common
 256  * code and thus allows architectures to override it if more needs to be
 257  * done. Not called for suspend to disk.
 258  */
 259 extern void arch_suspend_disable_irqs(void);
 260
 261 /**
 262  * arch_suspend_enable_irqs - enable IRQs after suspend
 263  *
 264  * Enables IRQs (in the default case). This is a weak symbol in the common
 265  * code and thus allows architectures to override it if more needs to be
 266  * done. Not called for suspend to disk.
 267  */
 268 extern void arch_suspend_enable_irqs(void);
 269
 270 extern int pm_suspend(suspend_state_t state);
 271 #else /* !CONFIG_SUSPEND */
 272 #define suspend_valid_only_mem  NULL
 273
 274 static inline void pm_suspend_clear_flags(void) {}
 275 static inline void pm_set_suspend_via_firmware(void) {}
 276 static inline void pm_set_resume_via_firmware(void) {}
 277 static inline bool pm_suspend_via_firmware(void) { return false; }
 278 static inline bool pm_resume_via_firmware(void) { return false; }
 279
 280 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
 281 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 282 static inline bool idle_should_freeze(void) { return false; }
 283 static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
 284 static inline void freeze_wake(void) {}
 285 #endif /* !CONFIG_SUSPEND */
 286
 287 /* struct pbe is used for creating lists of pages that should be restored
 288  * atomically during the resume from disk, because the page frames they have
 289  * occupied before the suspend are in use.
 290  */
 291 struct pbe {
 292         void *address;          /* address of the copy */
 293         void *orig_address;     /* original address of a page */
 294         struct pbe *next;
 295 };
 296
 297 /* mm/page_alloc.c */
 298 extern void mark_free_pages(struct zone *zone);
 299
 300 /**
 301  * struct platform_hibernation_ops - hibernation platform support
 302  *
 303  * The methods in this structure allow a platform to carry out special
 304  * operations required by it during a hibernation transition.
 305  *
 306  * All the methods below, except for @recover(), must be implemented.
 307  *
 308  * @begin: Tell the platform driver that we're starting hibernation.
 309  *      Called right after shrinking memory and before freezing devices.
 310  *
 311  * @end: Called by the PM core right after resuming devices, to indicate to
 312  *      the platform that the system has returned to the working state.
 313  *
 314  * @pre_snapshot: Prepare the platform for creating the hibernation image.
 315  *      Called right after devices have been frozen and before the nonboot
 316  *      CPUs are disabled (runs with IRQs on).
 317  *
 318  * @finish: Restore the previous state of the platform after the hibernation
 319  *      image has been created *or* put the platform into the normal operation
 320  *      mode after the hibernation (the same method is executed in both cases).
 321  *      Called right after the nonboot CPUs have been enabled and before
 322  *      thawing devices (runs with IRQs on).
 323  *
 324  * @prepare: Prepare the platform for entering the low power state.
 325  *      Called right after the hibernation image has been saved and before
 326  *      devices are prepared for entering the low power state.
 327  *
 328  * @enter: Put the system into the low power state after the hibernation image
 329  *      has been saved to disk.
 330  *      Called after the nonboot CPUs have been disabled and all of the low
 331  *      level devices have been shut down (runs with IRQs off).
 332  *
 333  * @leave: Perform the first stage of the cleanup after the system sleep state
 334  *      indicated by @set_target() has been left.
 335  *      Called right after the control has been passed from the boot kernel to
 336  *      the image kernel, before the nonboot CPUs are enabled and before devices
 337  *      are resumed.  Executed with interrupts disabled.
 338  *
 339  * @pre_restore: Prepare system for the restoration from a hibernation image.
 340  *      Called right after devices have been frozen and before the nonboot
 341  *      CPUs are disabled (runs with IRQs on).
 342  *
 343  * @restore_cleanup: Clean up after a failing image restoration.
 344  *      Called right after the nonboot CPUs have been enabled and before
 345  *      thawing devices (runs with IRQs on).
 346  *
 347  * @recover: Recover the platform from a failure to suspend devices.
 348  *      Called by the PM core if the suspending of devices during hibernation
 349  *      fails.  This callback is optional and should only be implemented by
 350  *      platforms which require special recovery actions in that situation.
 351  */
 352 struct platform_hibernation_ops {
 353         int (*begin)(void);
 354         void (*end)(void);
 355         int (*pre_snapshot)(void);
 356         void (*finish)(void);
 357         int (*prepare)(void);
 358         int (*enter)(void);
 359         void (*leave)(void);
 360         int (*pre_restore)(void);
 361         void (*restore_cleanup)(void);
 362         void (*recover)(void);
 363 };
 364
 365 #ifdef CONFIG_HIBERNATION
 366 /* kernel/power/snapshot.c */
 367 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
 368 static inline void __init register_nosave_region(unsigned long b, unsigned long e)
 369 {
 370         __register_nosave_region(b, e, 0);
 371 }
 372 static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
 373 {
 374         __register_nosave_region(b, e, 1);
 375 }
 376 extern int swsusp_page_is_forbidden(struct page *);
 377 extern void swsusp_set_page_free(struct page *);
 378 extern void swsusp_unset_page_free(struct page *);
 379 extern unsigned long get_safe_page(gfp_t gfp_mask);
 380
 381 extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
 382 extern int hibernate(void);
 383 extern bool system_entering_hibernation(void);
 384 extern bool hibernation_available(void);
 385 asmlinkage int swsusp_save(void);
 386 extern struct pbe *restore_pblist;
 387 #else /* CONFIG_HIBERNATION */
 388 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
 389 static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
 390 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 391 static inline void swsusp_set_page_free(struct page *p) {}
 392 static inline void swsusp_unset_page_free(struct page *p) {}
 393
 394 static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
 395 static inline int hibernate(void) { return -ENOSYS; }
 396 static inline bool system_entering_hibernation(void) { return false; }
 397 static inline bool hibernation_available(void) { return false; }
 398 #endif /* CONFIG_HIBERNATION */
 399
 400 /* Hibernation and suspend events */
 401 #define PM_HIBERNATION_PREPARE  0x0001 /* Going to hibernate */
 402 #define PM_POST_HIBERNATION     0x0002 /* Hibernation finished */
 403 #define PM_SUSPEND_PREPARE      0x0003 /* Going to suspend the system */
 404 #define PM_POST_SUSPEND         0x0004 /* Suspend finished */
 405 #define PM_RESTORE_PREPARE      0x0005 /* Going to restore a saved image */
 406 #define PM_POST_RESTORE         0x0006 /* Restore failed */
 407
 408 extern struct mutex pm_mutex;
 409
 410 #ifdef CONFIG_PM_SLEEP
 411 void save_processor_state(void);
 412 void restore_processor_state(void);
 413
 414 /* kernel/power/main.c */
 415 extern int register_pm_notifier(struct notifier_block *nb);
 416 extern int unregister_pm_notifier(struct notifier_block *nb);
 417
 418 #define pm_notifier(fn, pri) {                          \
 419         static struct notifier_block fn##_nb =                  \
 420                 { .notifier_call = fn, .priority = pri };       \
 421         register_pm_notifier(&fn##_nb);                 \
 422 }
 423
 424 /* drivers/base/power/wakeup.c */
 425 extern bool events_check_enabled;
 426 extern unsigned int pm_wakeup_irq;
 427
 428 extern bool pm_wakeup_pending(void);
 429 extern void pm_system_wakeup(void);
 430 extern void pm_wakeup_clear(void);
 431 extern void pm_system_irq_wakeup(unsigned int irq_number);
 432 extern bool pm_get_wakeup_count(unsigned int *count, bool block);
 433 extern bool pm_save_wakeup_count(unsigned int count);
 434 extern void pm_wakep_autosleep_enabled(bool set);
 435 extern void pm_print_active_wakeup_sources(void);
 436
 437 static inline void lock_system_sleep(void)
 438 {
 439         current->flags |= PF_FREEZER_SKIP;
 440         mutex_lock(&pm_mutex);
 441 }
 442
 443 static inline void unlock_system_sleep(void)
 444 {
 445         /*
 446          * Don't use freezer_count() because we don't want the call to
 447          * try_to_freeze() here.
 448          *
 449          * Reason:
 450          * Fundamentally, we just don't need it, because freezing condition
 451          * doesn't come into effect until we release the pm_mutex lock,
 452          * since the freezer always works with pm_mutex held.
 453          *
 454          * More importantly, in the case of hibernation,
 455          * unlock_system_sleep() gets called in snapshot_read() and
 456          * snapshot_write() when the freezing condition is still in effect.
 457          * Which means, if we use try_to_freeze() here, it would make them
 458          * enter the refrigerator, thus causing hibernation to lockup.
 459          */
 460         current->flags &= ~PF_FREEZER_SKIP;
 461         mutex_unlock(&pm_mutex);
 462 }
 463
 464 #else /* !CONFIG_PM_SLEEP */
 465
 466 static inline int register_pm_notifier(struct notifier_block *nb)
 467 {
 468         return 0;
 469 }
 470
 471 static inline int unregister_pm_notifier(struct notifier_block *nb)
 472 {
 473         return 0;
 474 }
 475
 476 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 477
 478 static inline bool pm_wakeup_pending(void) { return false; }
 479 static inline void pm_system_wakeup(void) {}
 480 static inline void pm_wakeup_clear(void) {}
 481 static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
 482
 483 static inline void lock_system_sleep(void) {}
 484 static inline void unlock_system_sleep(void) {}
 485
 486 #endif /* !CONFIG_PM_SLEEP */
 487
 488 #ifdef CONFIG_PM_SLEEP_DEBUG
 489 extern bool pm_print_times_enabled;
 490 #else
 491 #define pm_print_times_enabled  (false)
 492 #endif
 493
 494 #ifdef CONFIG_PM_AUTOSLEEP
 495
 496 /* kernel/power/autosleep.c */
 497 void queue_up_suspend_work(void);
 498
 499 #else /* !CONFIG_PM_AUTOSLEEP */
 500
 501 static inline void queue_up_suspend_work(void) {}
 502
 503 #endif /* !CONFIG_PM_AUTOSLEEP */
 504
 505 #ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
 506 /*
 507  * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
 508  * to save/restore additional information to/from the array of page
 509  * frame numbers in the hibernation image. For s390 this is used to
 510  * save and restore the storage key for each page that is included
 511  * in the hibernation image.
 512  */
 513 unsigned long page_key_additional_pages(unsigned long pages);
 514 int page_key_alloc(unsigned long pages);
 515 void page_key_free(void);
 516 void page_key_read(unsigned long *pfn);
 517 void page_key_memorize(unsigned long *pfn);
 518 void page_key_write(void *address);
 519
 520 #else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
 521
 522 static inline unsigned long page_key_additional_pages(unsigned long pages)
 523 {
 524         return 0;
 525 }
 526
 527 static inline int  page_key_alloc(unsigned long pages)
 528 {
 529         return 0;
 530 }
 531
 532 static inline void page_key_free(void) {}
 533 static inline void page_key_read(unsigned long *pfn) {}
 534 static inline void page_key_memorize(unsigned long *pfn) {}
 535 static inline void page_key_write(void *address) {}
 536
 537 #endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
 538
 539 #endif /* _LINUX_SUSPEND_H */