linux/kernel/time/tick-internal.h
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   1/*
   2 * tick internal variable and functions used by low/high res code
   3 */
   4#include <linux/hrtimer.h>
   5#include <linux/tick.h>
   6
   7#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
   8
   9#define TICK_DO_TIMER_NONE      -1
  10#define TICK_DO_TIMER_BOOT      -2
  11
  12DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  13extern ktime_t tick_next_period;
  14extern ktime_t tick_period;
  15extern int tick_do_timer_cpu __read_mostly;
  16
  17extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  18extern void tick_handle_periodic(struct clock_event_device *dev);
  19
  20extern void clockevents_shutdown(struct clock_event_device *dev);
  21
  22/*
  23 * NO_HZ / high resolution timer shared code
  24 */
  25#ifdef CONFIG_TICK_ONESHOT
  26extern void tick_setup_oneshot(struct clock_event_device *newdev,
  27                               void (*handler)(struct clock_event_device *),
  28                               ktime_t nextevt);
  29extern int tick_program_event(ktime_t expires, int force);
  30extern void tick_oneshot_notify(void);
  31extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  32extern void tick_resume_oneshot(void);
  33# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  34extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  35extern void tick_broadcast_oneshot_control(unsigned long reason);
  36extern void tick_broadcast_switch_to_oneshot(void);
  37extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  38extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  39extern int tick_broadcast_oneshot_active(void);
  40extern void tick_check_oneshot_broadcast(int cpu);
  41bool tick_broadcast_oneshot_available(void);
  42# else /* BROADCAST */
  43static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  44{
  45        BUG();
  46}
  47static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  48static inline void tick_broadcast_switch_to_oneshot(void) { }
  49static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  50static inline int tick_broadcast_oneshot_active(void) { return 0; }
  51static inline void tick_check_oneshot_broadcast(int cpu) { }
  52static inline bool tick_broadcast_oneshot_available(void) { return true; }
  53# endif /* !BROADCAST */
  54
  55#else /* !ONESHOT */
  56static inline
  57void tick_setup_oneshot(struct clock_event_device *newdev,
  58                        void (*handler)(struct clock_event_device *),
  59                        ktime_t nextevt)
  60{
  61        BUG();
  62}
  63static inline void tick_resume_oneshot(void)
  64{
  65        BUG();
  66}
  67static inline int tick_program_event(ktime_t expires, int force)
  68{
  69        return 0;
  70}
  71static inline void tick_oneshot_notify(void) { }
  72static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  73{
  74        BUG();
  75}
  76static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  77static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  78static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  79{
  80        return 0;
  81}
  82static inline int tick_broadcast_oneshot_active(void) { return 0; }
  83static inline bool tick_broadcast_oneshot_available(void) { return false; }
  84#endif /* !TICK_ONESHOT */
  85
  86/*
  87 * Broadcasting support
  88 */
  89#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  90extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  91extern int tick_check_broadcast_device(struct clock_event_device *dev);
  92extern int tick_is_broadcast_device(struct clock_event_device *dev);
  93extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  94extern void tick_shutdown_broadcast(unsigned int *cpup);
  95extern void tick_suspend_broadcast(void);
  96extern int tick_resume_broadcast(void);
  97
  98extern void
  99tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 100
 101#else /* !BROADCAST */
 102
 103static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 104{
 105        return 0;
 106}
 107
 108static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 109{
 110        return 0;
 111}
 112static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 113                                             int cpu)
 114{
 115        return 0;
 116}
 117static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 118static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 119static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 120static inline void tick_suspend_broadcast(void) { }
 121static inline int tick_resume_broadcast(void) { return 0; }
 122
 123/*
 124 * Set the periodic handler in non broadcast mode
 125 */
 126static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 127                                             int broadcast)
 128{
 129        dev->event_handler = tick_handle_periodic;
 130}
 131#endif /* !BROADCAST */
 132
 133/*
 134 * Check, if the device is functional or a dummy for broadcast
 135 */
 136static inline int tick_device_is_functional(struct clock_event_device *dev)
 137{
 138        return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 139}
 140
 141#endif
 142
 143extern void do_timer(unsigned long ticks);
 144extern seqlock_t xtime_lock;
 145
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