kernel/time/tick-internal.h

   1 /*
   2  * tick internal variable and functions used by low/high res code
   3  */
   4
   5 #define TICK_DO_TIMER_NONE      -1
   6 #define TICK_DO_TIMER_BOOT      -2
   7
   8 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
   9 extern spinlock_t tick_device_lock;
  10 extern ktime_t tick_next_period;
  11 extern ktime_t tick_period;
  12 extern int tick_do_timer_cpu __read_mostly;
  13
  14 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  15 extern void tick_handle_periodic(struct clock_event_device *dev);
  16
  17 extern void clockevents_shutdown(struct clock_event_device *dev);
  18
  19 /*
  20  * NO_HZ / high resolution timer shared code
  21  */
  22 #ifdef CONFIG_TICK_ONESHOT
  23 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  24                                void (*handler)(struct clock_event_device *),
  25                                ktime_t nextevt);
  26 extern int tick_dev_program_event(struct clock_event_device *dev,
  27                                   ktime_t expires, int force);
  28 extern int tick_program_event(ktime_t expires, int force);
  29 extern void tick_oneshot_notify(void);
  30 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  31 extern void tick_resume_oneshot(void);
  32 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  33 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  34 extern void tick_broadcast_oneshot_control(unsigned long reason);
  35 extern void tick_broadcast_switch_to_oneshot(void);
  36 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  37 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  38 extern int tick_broadcast_oneshot_active(void);
  39 extern void tick_check_oneshot_broadcast(int cpu);
  40 # else /* BROADCAST */
  41 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  42 {
  43         BUG();
  44 }
  45 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  46 static inline void tick_broadcast_switch_to_oneshot(void) { }
  47 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  48 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  49 static inline void tick_check_oneshot_broadcast(int cpu) { }
  50 # endif /* !BROADCAST */
  51
  52 #else /* !ONESHOT */
  53 static inline
  54 void tick_setup_oneshot(struct clock_event_device *newdev,
  55                         void (*handler)(struct clock_event_device *),
  56                         ktime_t nextevt)
  57 {
  58         BUG();
  59 }
  60 static inline void tick_resume_oneshot(void)
  61 {
  62         BUG();
  63 }
  64 static inline int tick_program_event(ktime_t expires, int force)
  65 {
  66         return 0;
  67 }
  68 static inline void tick_oneshot_notify(void) { }
  69 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  70 {
  71         BUG();
  72 }
  73 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  74 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  75 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  76 {
  77         return 0;
  78 }
  79 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  80 #endif /* !TICK_ONESHOT */
  81
  82 /*
  83  * Broadcasting support
  84  */
  85 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  86 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  87 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  88 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  89 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  90 extern void tick_shutdown_broadcast(unsigned int *cpup);
  91 extern void tick_suspend_broadcast(void);
  92 extern int tick_resume_broadcast(void);
  93
  94 extern void
  95 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  96
  97 #else /* !BROADCAST */
  98
  99 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 100 {
 101         return 0;
 102 }
 103
 104 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 105 {
 106         return 0;
 107 }
 108 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 109                                              int cpu)
 110 {
 111         return 0;
 112 }
 113 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 114 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 115 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 116 static inline void tick_suspend_broadcast(void) { }
 117 static inline int tick_resume_broadcast(void) { return 0; }
 118
 119 /*
 120  * Set the periodic handler in non broadcast mode
 121  */
 122 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 123                                              int broadcast)
 124 {
 125         dev->event_handler = tick_handle_periodic;
 126 }
 127 #endif /* !BROADCAST */
 128
 129 /*
 130  * Check, if the device is functional or a dummy for broadcast
 131  */
 132 static inline int tick_device_is_functional(struct clock_event_device *dev)
 133 {
 134         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 135 }