kernel/time/tick-internal.h

   1 /*
   2  * tick internal variable and functions used by low/high res code
   3  */
   4 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
   5 extern spinlock_t tick_device_lock;
   6 extern ktime_t tick_next_period;
   7 extern ktime_t tick_period;
   8 extern int tick_do_timer_cpu __read_mostly;
   9
  10 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  11 extern void tick_handle_periodic(struct clock_event_device *dev);
  12
  13 /*
  14  * NO_HZ / high resolution timer shared code
  15  */
  16 #ifdef CONFIG_TICK_ONESHOT
  17 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  18                                void (*handler)(struct clock_event_device *),
  19                                ktime_t nextevt);
  20 extern int tick_dev_program_event(struct clock_event_device *dev,
  21                                   ktime_t expires, int force);
  22 extern int tick_program_event(ktime_t expires, int force);
  23 extern void tick_oneshot_notify(void);
  24 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  25 extern void tick_resume_oneshot(void);
  26 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  27 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  28 extern void tick_broadcast_oneshot_control(unsigned long reason);
  29 extern void tick_broadcast_switch_to_oneshot(void);
  30 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  31 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  32 # else /* BROADCAST */
  33 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  34 {
  35         BUG();
  36 }
  37 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  38 static inline void tick_broadcast_switch_to_oneshot(void) { }
  39 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  40 # endif /* !BROADCAST */
  41
  42 #else /* !ONESHOT */
  43 static inline
  44 void tick_setup_oneshot(struct clock_event_device *newdev,
  45                         void (*handler)(struct clock_event_device *),
  46                         ktime_t nextevt)
  47 {
  48         BUG();
  49 }
  50 static inline void tick_resume_oneshot(void)
  51 {
  52         BUG();
  53 }
  54 static inline int tick_program_event(ktime_t expires, int force)
  55 {
  56         return 0;
  57 }
  58 static inline void tick_oneshot_notify(void) { }
  59 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  60 {
  61         BUG();
  62 }
  63 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  64 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  65 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  66 {
  67         return 0;
  68 }
  69 #endif /* !TICK_ONESHOT */
  70
  71 /*
  72  * Broadcasting support
  73  */
  74 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  75 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  76 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  77 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  78 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  79 extern void tick_shutdown_broadcast(unsigned int *cpup);
  80 extern void tick_suspend_broadcast(void);
  81 extern int tick_resume_broadcast(void);
  82
  83 extern void
  84 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  85
  86 #else /* !BROADCAST */
  87
  88 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
  89 {
  90         return 0;
  91 }
  92
  93 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
  94 {
  95         return 0;
  96 }
  97 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
  98                                              int cpu)
  99 {
 100         return 0;
 101 }
 102 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 103 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 104 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 105 static inline void tick_suspend_broadcast(void) { }
 106 static inline int tick_resume_broadcast(void) { return 0; }
 107
 108 /*
 109  * Set the periodic handler in non broadcast mode
 110  */
 111 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 112                                              int broadcast)
 113 {
 114         dev->event_handler = tick_handle_periodic;
 115 }
 116 #endif /* !BROADCAST */
 117
 118 /*
 119  * Check, if the device is functional or a dummy for broadcast
 120  */
 121 static inline int tick_device_is_functional(struct clock_event_device *dev)
 122 {
 123         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 124 }