| 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 */ |