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 # else /* BROADCAST */
  40 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  41 {
  42         BUG();
  43 }
  44 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  45 static inline void tick_broadcast_switch_to_oneshot(void) { }
  46 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  47 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  48 # endif /* !BROADCAST */
  49
  50 #else /* !ONESHOT */
  51 static inline
  52 void tick_setup_oneshot(struct clock_event_device *newdev,
  53                         void (*handler)(struct clock_event_device *),
  54                         ktime_t nextevt)
  55 {
  56         BUG();
  57 }
  58 static inline void tick_resume_oneshot(void)
  59 {
  60         BUG();
  61 }
  62 static inline int tick_program_event(ktime_t expires, int force)
  63 {
  64         return 0;
  65 }
  66 static inline void tick_oneshot_notify(void) { }
  67 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  68 {
  69         BUG();
  70 }
  71 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  72 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  73 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  74 {
  75         return 0;
  76 }
  77 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  78 #endif /* !TICK_ONESHOT */
  79
  80 /*
  81  * Broadcasting support
  82  */
  83 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  84 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  85 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  86 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  87 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  88 extern void tick_shutdown_broadcast(unsigned int *cpup);
  89 extern void tick_suspend_broadcast(void);
  90 extern int tick_resume_broadcast(void);
  91
  92 extern void
  93 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  94
  95 #else /* !BROADCAST */
  96
  97 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
  98 {
  99         return 0;
 100 }
 101
 102 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 103 {
 104         return 0;
 105 }
 106 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 107                                              int cpu)
 108 {
 109         return 0;
 110 }
 111 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 112 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 113 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 114 static inline void tick_suspend_broadcast(void) { }
 115 static inline int tick_resume_broadcast(void) { return 0; }
 116
 117 /*
 118  * Set the periodic handler in non broadcast mode
 119  */
 120 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 121                                              int broadcast)
 122 {
 123         dev->event_handler = tick_handle_periodic;
 124 }
 125 #endif /* !BROADCAST */
 126
 127 /*
 128  * Check, if the device is functional or a dummy for broadcast
 129  */
 130 static inline int tick_device_is_functional(struct clock_event_device *dev)
 131 {
 132         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 133 }