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  * @set_target: Tell the platform which system sleep state is going to be
  42  *      entered.
  43  *      @set_target() is executed right prior to suspending devices.  The
  44  *      information conveyed to the platform code by @set_target() should be
  45  *      disregarded by the platform as soon as @finish() is executed and if
  46  *      @prepare() fails.  If @set_target() fails (ie. returns nonzero),
  47  *      @prepare(), @enter() and @finish() will not be called by the PM core.
  48  *      This callback is optional.  However, if it is implemented, the argument
  49  *      passed to @enter() is meaningless and should be ignored.
  50  *
  51  * @prepare: Prepare the platform for entering the system sleep state indicated
  52  *      by @set_target().
  53  *      @prepare() is called right after devices have been suspended (ie. the
  54  *      appropriate .suspend() method has been executed for each device) and
  55  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
  56  *      This callback is optional.  It returns 0 on success or a negative
  57  *      error code otherwise, in which case the system cannot enter the desired
  58  *      sleep state (@enter() and @finish() will not be called in that case).
  59  *
  60  * @enter: Enter the system sleep state indicated by @set_target() or
  61  *      represented by the argument if @set_target() is not implemented.
  62  *      This callback is mandatory.  It returns 0 on success or a negative
  63  *      error code otherwise, in which case the system cannot enter the desired
  64  *      sleep state.
  65  *
  66  * @finish: Called when the system has just left a sleep state, right after
  67  *      the nonboot CPUs have been enabled and before devices are resumed (it is
  68  *      executed with IRQs enabled).
  69  *      This callback is optional, but should be implemented by the platforms
  70  *      that implement @prepare().  If implemented, it is always called after
  71  *      @enter() (even if @enter() fails).
  72  */
  73 struct platform_suspend_ops {
  74         int (*valid)(suspend_state_t state);
  75         int (*set_target)(suspend_state_t state);
  76         int (*prepare)(void);
  77         int (*enter)(suspend_state_t state);
  78         void (*finish)(void);
  79 };
  80
  81 #ifdef CONFIG_SUSPEND
  82 /**
  83  * suspend_set_ops - set platform dependent suspend operations
  84  * @ops: The new suspend operations to set.
  85  */
  86 extern void suspend_set_ops(struct platform_suspend_ops *ops);
  87 extern int suspend_valid_only_mem(suspend_state_t state);
  88
  89 /**
  90  * arch_suspend_disable_irqs - disable IRQs for suspend
  91  *
  92  * Disables IRQs (in the default case). This is a weak symbol in the common
  93  * code and thus allows architectures to override it if more needs to be
  94  * done. Not called for suspend to disk.
  95  */
  96 extern void arch_suspend_disable_irqs(void);
  97
  98 /**
  99  * arch_suspend_enable_irqs - enable IRQs after suspend
 100  *
 101  * Enables IRQs (in the default case). This is a weak symbol in the common
 102  * code and thus allows architectures to override it if more needs to be
 103  * done. Not called for suspend to disk.
 104  */
 105 extern void arch_suspend_enable_irqs(void);
 106
 107 extern int pm_suspend(suspend_state_t state);
 108 #else /* !CONFIG_SUSPEND */
 109 #define suspend_valid_only_mem  NULL
 110
 111 static inline void suspend_set_ops(struct platform_suspend_ops *ops) {}
 112 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 113 #endif /* !CONFIG_SUSPEND */
 114
 115 /* struct pbe is used for creating lists of pages that should be restored
 116  * atomically during the resume from disk, because the page frames they have
 117  * occupied before the suspend are in use.
 118  */
 119 struct pbe {
 120         void *address;          /* address of the copy */
 121         void *orig_address;     /* original address of a page */
 122         struct pbe *next;
 123 };
 124
 125 /* mm/page_alloc.c */
 126 extern void drain_local_pages(void);
 127 extern void mark_free_pages(struct zone *zone);
 128
 129 /**
 130  * struct platform_hibernation_ops - hibernation platform support
 131  *
 132  * The methods in this structure allow a platform to override the default
 133  * mechanism of shutting down the machine during a hibernation transition.
 134  *
 135  * All three methods must be assigned.
 136  *
 137  * @start: Tell the platform driver that we're starting hibernation.
 138  *      Called right after shrinking memory and before freezing devices.
 139  *
 140  * @pre_snapshot: Prepare the platform for creating the hibernation image.
 141  *      Called right after devices have been frozen and before the nonboot
 142  *      CPUs are disabled (runs with IRQs on).
 143  *
 144  * @finish: Restore the previous state of the platform after the hibernation
 145  *      image has been created *or* put the platform into the normal operation
 146  *      mode after the hibernation (the same method is executed in both cases).
 147  *      Called right after the nonboot CPUs have been enabled and before
 148  *      thawing devices (runs with IRQs on).
 149  *
 150  * @prepare: Prepare the platform for entering the low power state.
 151  *      Called right after the hibernation image has been saved and before
 152  *      devices are prepared for entering the low power state.
 153  *
 154  * @enter: Put the system into the low power state after the hibernation image
 155  *      has been saved to disk.
 156  *      Called after the nonboot CPUs have been disabled and all of the low
 157  *      level devices have been shut down (runs with IRQs off).
 158  *
 159  * @pre_restore: Prepare system for the restoration from a hibernation image.
 160  *      Called right after devices have been frozen and before the nonboot
 161  *      CPUs are disabled (runs with IRQs on).
 162  *
 163  * @restore_cleanup: Clean up after a failing image restoration.
 164  *      Called right after the nonboot CPUs have been enabled and before
 165  *      thawing devices (runs with IRQs on).
 166  */
 167 struct platform_hibernation_ops {
 168         int (*start)(void);
 169         int (*pre_snapshot)(void);
 170         void (*finish)(void);
 171         int (*prepare)(void);
 172         int (*enter)(void);
 173         int (*pre_restore)(void);
 174         void (*restore_cleanup)(void);
 175 };
 176
 177 #ifdef CONFIG_HIBERNATION
 178 /* kernel/power/snapshot.c */
 179 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
 180 static inline void register_nosave_region(unsigned long b, unsigned long e)
 181 {
 182         __register_nosave_region(b, e, 0);
 183 }
 184 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 185 {
 186         __register_nosave_region(b, e, 1);
 187 }
 188 extern int swsusp_page_is_forbidden(struct page *);
 189 extern void swsusp_set_page_free(struct page *);
 190 extern void swsusp_unset_page_free(struct page *);
 191 extern unsigned long get_safe_page(gfp_t gfp_mask);
 192
 193 extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
 194 extern int hibernate(void);
 195 #else /* CONFIG_HIBERNATION */
 196 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 197 static inline void swsusp_set_page_free(struct page *p) {}
 198 static inline void swsusp_unset_page_free(struct page *p) {}
 199
 200 static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
 201 static inline int hibernate(void) { return -ENOSYS; }
 202 #endif /* CONFIG_HIBERNATION */
 203
 204 #ifdef CONFIG_PM_SLEEP
 205 void save_processor_state(void);
 206 void restore_processor_state(void);
 207 struct saved_context;
 208 void __save_processor_state(struct saved_context *ctxt);
 209 void __restore_processor_state(struct saved_context *ctxt);
 210
 211 /* kernel/power/main.c */
 212 extern struct blocking_notifier_head pm_chain_head;
 213
 214 static inline int register_pm_notifier(struct notifier_block *nb)
 215 {
 216         return blocking_notifier_chain_register(&pm_chain_head, nb);
 217 }
 218
 219 static inline int unregister_pm_notifier(struct notifier_block *nb)
 220 {
 221         return blocking_notifier_chain_unregister(&pm_chain_head, nb);
 222 }
 223
 224 #define pm_notifier(fn, pri) {                          \
 225         static struct notifier_block fn##_nb =                  \
 226                 { .notifier_call = fn, .priority = pri };       \
 227         register_pm_notifier(&fn##_nb);                 \
 228 }
 229 #else /* !CONFIG_PM_SLEEP */
 230
 231 static inline int register_pm_notifier(struct notifier_block *nb)
 232 {
 233         return 0;
 234 }
 235
 236 static inline int unregister_pm_notifier(struct notifier_block *nb)
 237 {
 238         return 0;
 239 }
 240
 241 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 242 #endif /* !CONFIG_PM_SLEEP */
 243
 244 #ifndef CONFIG_HIBERNATION
 245 static inline void register_nosave_region(unsigned long b, unsigned long e)
 246 {
 247 }
 248 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 249 {
 250 }
 251 #endif
 252
 253 #endif /* _LINUX_SUSPEND_H */