include/linux/suspend.h

   1 #ifndef _LINUX_SUSPEND_H
   2 #define _LINUX_SUSPEND_H
   3
   4 #if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)
   5 #include <asm/suspend.h>
   6 #endif
   7 #include <linux/swap.h>
   8 #include <linux/notifier.h>
   9 #include <linux/init.h>
  10 #include <linux/pm.h>
  11 #include <linux/mm.h>
  12 #include <asm/errno.h>
  13
  14 #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
  15 extern int pm_prepare_console(void);
  16 extern void pm_restore_console(void);
  17 #else
  18 static inline int pm_prepare_console(void) { return 0; }
  19 static inline void pm_restore_console(void) {}
  20 #endif
  21
  22 typedef int __bitwise suspend_state_t;
  23
  24 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
  25 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
  26 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
  27 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 4)
  28
  29 /**
  30  * struct platform_suspend_ops - Callbacks for managing platform dependent
  31  *      system sleep states.
  32  *
  33  * @valid: Callback to determine if given system sleep state is supported by
  34  *      the platform.
  35  *      Valid (ie. supported) states are advertised in /sys/power/state.  Note
  36  *      that it still may be impossible to enter given system sleep state if the
  37  *      conditions aren't right.
  38  *      There is the %suspend_valid_only_mem function available that can be
  39  *      assigned to this if the platform only supports mem sleep.
  40  *
  41  * @begin: Initialise a transition to given system sleep state.
  42  *      @begin() is executed right prior to suspending devices.  The information
  43  *      conveyed to the platform code by @begin() should be disregarded by it as
  44  *      soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
  45  *      @prepare(), @enter() and @finish() will not be called by the PM core.
  46  *      This callback is optional.  However, if it is implemented, the argument
  47  *      passed to @enter() is redundant and should be ignored.
  48  *
  49  * @prepare: Prepare the platform for entering the system sleep state indicated
  50  *      by @begin().
  51  *      @prepare() is called right after devices have been suspended (ie. the
  52  *      appropriate .suspend() method has been executed for each device) and
  53  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
  54  *      This callback is optional.  It returns 0 on success or a negative
  55  *      error code otherwise, in which case the system cannot enter the desired
  56  *      sleep state (@enter() and @finish() will not be called in that case).
  57  *
  58  * @enter: Enter the system sleep state indicated by @begin() or represented by
  59  *      the argument if @begin() is not implemented.
  60  *      This callback is mandatory.  It returns 0 on success or a negative
  61  *      error code otherwise, in which case the system cannot enter the desired
  62  *      sleep state.
  63  *
  64  * @finish: Called when the system has just left a sleep state, right after
  65  *      the nonboot CPUs have been enabled and before devices are resumed (it is
  66  *      executed with IRQs enabled).
  67  *      This callback is optional, but should be implemented by the platforms
  68  *      that implement @prepare().  If implemented, it is always called after
  69  *      @enter() (even if @enter() fails).
  70  *
  71  * @end: Called by the PM core right after resuming devices, to indicate to
  72  *      the platform that the system has returned to the working state or
  73  *      the transition to the sleep state has been aborted.
  74  *      This callback is optional, but should be implemented by the platforms
  75  *      that implement @begin(), but platforms implementing @begin() should
  76  *      also provide a @end() which cleans up transitions aborted before
  77  *      @enter().
  78  */
  79 struct platform_suspend_ops {
  80         int (*valid)(suspend_state_t state);
  81         int (*begin)(suspend_state_t state);
  82         int (*prepare)(void);
  83         int (*enter)(suspend_state_t state);
  84         void (*finish)(void);
  85         void (*end)(void);
  86 };
  87
  88 #ifdef CONFIG_SUSPEND
  89 /**
  90  * suspend_set_ops - set platform dependent suspend operations
  91  * @ops: The new suspend operations to set.
  92  */
  93 extern void suspend_set_ops(struct platform_suspend_ops *ops);
  94 extern int suspend_valid_only_mem(suspend_state_t state);
  95
  96 /**
  97  * arch_suspend_disable_irqs - disable IRQs for suspend
  98  *
  99  * Disables IRQs (in the default case). This is a weak symbol in the common
 100  * code and thus allows architectures to override it if more needs to be
 101  * done. Not called for suspend to disk.
 102  */
 103 extern void arch_suspend_disable_irqs(void);
 104
 105 /**
 106  * arch_suspend_enable_irqs - enable IRQs after suspend
 107  *
 108  * Enables IRQs (in the default case). This is a weak symbol in the common
 109  * code and thus allows architectures to override it if more needs to be
 110  * done. Not called for suspend to disk.
 111  */
 112 extern void arch_suspend_enable_irqs(void);
 113
 114 extern int pm_suspend(suspend_state_t state);
 115 #else /* !CONFIG_SUSPEND */
 116 #define suspend_valid_only_mem  NULL
 117
 118 static inline void suspend_set_ops(struct platform_suspend_ops *ops) {}
 119 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 120 #endif /* !CONFIG_SUSPEND */
 121
 122 /* struct pbe is used for creating lists of pages that should be restored
 123  * atomically during the resume from disk, because the page frames they have
 124  * occupied before the suspend are in use.
 125  */
 126 struct pbe {
 127         void *address;          /* address of the copy */
 128         void *orig_address;     /* original address of a page */
 129         struct pbe *next;
 130 };
 131
 132 /* mm/page_alloc.c */
 133 extern void drain_local_pages(void);
 134 extern void mark_free_pages(struct zone *zone);
 135
 136 /**
 137  * struct platform_hibernation_ops - hibernation platform support
 138  *
 139  * The methods in this structure allow a platform to carry out special
 140  * operations required by it during a hibernation transition.
 141  *
 142  * All the methods below must be implemented.
 143  *
 144  * @begin: Tell the platform driver that we're starting hibernation.
 145  *      Called right after shrinking memory and before freezing devices.
 146  *
 147  * @end: Called by the PM core right after resuming devices, to indicate to
 148  *      the platform that the system has returned to the working state.
 149  *
 150  * @pre_snapshot: Prepare the platform for creating the hibernation image.
 151  *      Called right after devices have been frozen and before the nonboot
 152  *      CPUs are disabled (runs with IRQs on).
 153  *
 154  * @finish: Restore the previous state of the platform after the hibernation
 155  *      image has been created *or* put the platform into the normal operation
 156  *      mode after the hibernation (the same method is executed in both cases).
 157  *      Called right after the nonboot CPUs have been enabled and before
 158  *      thawing devices (runs with IRQs on).
 159  *
 160  * @prepare: Prepare the platform for entering the low power state.
 161  *      Called right after the hibernation image has been saved and before
 162  *      devices are prepared for entering the low power state.
 163  *
 164  * @enter: Put the system into the low power state after the hibernation image
 165  *      has been saved to disk.
 166  *      Called after the nonboot CPUs have been disabled and all of the low
 167  *      level devices have been shut down (runs with IRQs off).
 168  *
 169  * @leave: Perform the first stage of the cleanup after the system sleep state
 170  *      indicated by @set_target() has been left.
 171  *      Called right after the control has been passed from the boot kernel to
 172  *      the image kernel, before the nonboot CPUs are enabled and before devices
 173  *      are resumed.  Executed with interrupts disabled.
 174  *
 175  * @pre_restore: Prepare system for the restoration from a hibernation image.
 176  *      Called right after devices have been frozen and before the nonboot
 177  *      CPUs are disabled (runs with IRQs on).
 178  *
 179  * @restore_cleanup: Clean up after a failing image restoration.
 180  *      Called right after the nonboot CPUs have been enabled and before
 181  *      thawing devices (runs with IRQs on).
 182  */
 183 struct platform_hibernation_ops {
 184         int (*begin)(void);
 185         void (*end)(void);
 186         int (*pre_snapshot)(void);
 187         void (*finish)(void);
 188         int (*prepare)(void);
 189         int (*enter)(void);
 190         void (*leave)(void);
 191         int (*pre_restore)(void);
 192         void (*restore_cleanup)(void);
 193 };
 194
 195 #ifdef CONFIG_HIBERNATION
 196 /* kernel/power/snapshot.c */
 197 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
 198 static inline void register_nosave_region(unsigned long b, unsigned long e)
 199 {
 200         __register_nosave_region(b, e, 0);
 201 }
 202 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 203 {
 204         __register_nosave_region(b, e, 1);
 205 }
 206 extern int swsusp_page_is_forbidden(struct page *);
 207 extern void swsusp_set_page_free(struct page *);
 208 extern void swsusp_unset_page_free(struct page *);
 209 extern unsigned long get_safe_page(gfp_t gfp_mask);
 210
 211 extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
 212 extern int hibernate(void);
 213 #else /* CONFIG_HIBERNATION */
 214 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 215 static inline void swsusp_set_page_free(struct page *p) {}
 216 static inline void swsusp_unset_page_free(struct page *p) {}
 217
 218 static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
 219 static inline int hibernate(void) { return -ENOSYS; }
 220 #endif /* CONFIG_HIBERNATION */
 221
 222 #ifdef CONFIG_PM_SLEEP
 223 void save_processor_state(void);
 224 void restore_processor_state(void);
 225
 226 /* kernel/power/main.c */
 227 extern int register_pm_notifier(struct notifier_block *nb);
 228 extern int unregister_pm_notifier(struct notifier_block *nb);
 229
 230 #define pm_notifier(fn, pri) {                          \
 231         static struct notifier_block fn##_nb =                  \
 232                 { .notifier_call = fn, .priority = pri };       \
 233         register_pm_notifier(&fn##_nb);                 \
 234 }
 235 #else /* !CONFIG_PM_SLEEP */
 236
 237 static inline int register_pm_notifier(struct notifier_block *nb)
 238 {
 239         return 0;
 240 }
 241
 242 static inline int unregister_pm_notifier(struct notifier_block *nb)
 243 {
 244         return 0;
 245 }
 246
 247 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 248 #endif /* !CONFIG_PM_SLEEP */
 249
 250 #ifndef CONFIG_HIBERNATION
 251 static inline void register_nosave_region(unsigned long b, unsigned long e)
 252 {
 253 }
 254 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 255 {
 256 }
 257 #endif
 258
 259 #endif /* _LINUX_SUSPEND_H */