LXR linux/kernel/time/tick-internal.h

   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
   7extern seqlock_t jiffies_lock;
   8
   9#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
  10
  11#define TICK_DO_TIMER_NONE      -1
  12#define TICK_DO_TIMER_BOOT      -2
  13
  14DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  15extern ktime_t tick_next_period;
  16extern ktime_t tick_period;
  17extern int tick_do_timer_cpu __read_mostly;
  18
  19extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  20extern void tick_handle_periodic(struct clock_event_device *dev);
  21
  22extern void clockevents_shutdown(struct clock_event_device *dev);
  23
  24/*
  25 * NO_HZ / high resolution timer shared code
  26 */
  27#ifdef CONFIG_TICK_ONESHOT
  28extern void tick_setup_oneshot(struct clock_event_device *newdev,
  29                               void (*handler)(struct clock_event_device *),
  30                               ktime_t nextevt);
  31extern int tick_program_event(ktime_t expires, int force);
  32extern void tick_oneshot_notify(void);
  33extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  34extern void tick_resume_oneshot(void);
  35# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  36extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  37extern void tick_broadcast_oneshot_control(unsigned long reason);
  38extern void tick_broadcast_switch_to_oneshot(void);
  39extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  40extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  41extern int tick_broadcast_oneshot_active(void);
  42extern void tick_check_oneshot_broadcast(int cpu);
  43bool tick_broadcast_oneshot_available(void);
  44# else /* BROADCAST */
  45static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  46{
  47        BUG();
  48}
  49static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  50static inline void tick_broadcast_switch_to_oneshot(void) { }
  51static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  52static inline int tick_broadcast_oneshot_active(void) { return 0; }
  53static inline void tick_check_oneshot_broadcast(int cpu) { }
  54static inline bool tick_broadcast_oneshot_available(void) { return true; }
  55# endif /* !BROADCAST */
  56
  57#else /* !ONESHOT */
  58static inline
  59void tick_setup_oneshot(struct clock_event_device *newdev,
  60                        void (*handler)(struct clock_event_device *),
  61                        ktime_t nextevt)
  62{
  63        BUG();
  64}
  65static inline void tick_resume_oneshot(void)
  66{
  67        BUG();
  68}
  69static inline int tick_program_event(ktime_t expires, int force)
  70{
  71        return 0;
  72}
  73static inline void tick_oneshot_notify(void) { }
  74static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  75{
  76        BUG();
  77}
  78static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  79static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  80static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  81{
  82        return 0;
  83}
  84static inline int tick_broadcast_oneshot_active(void) { return 0; }
  85static inline bool tick_broadcast_oneshot_available(void) { return false; }
  86#endif /* !TICK_ONESHOT */
  87
  88/*
  89 * Broadcasting support
  90 */
  91#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  92extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  93extern int tick_check_broadcast_device(struct clock_event_device *dev);
  94extern int tick_is_broadcast_device(struct clock_event_device *dev);
  95extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  96extern void tick_shutdown_broadcast(unsigned int *cpup);
  97extern void tick_suspend_broadcast(void);
  98extern int tick_resume_broadcast(void);
  99extern void tick_broadcast_init(void);
 100extern void
 101tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 102
 103#else /* !BROADCAST */
 104
 105static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 106{
 107        return 0;
 108}
 109
 110static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 111{
 112        return 0;
 113}
 114static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 115                                             int cpu)
 116{
 117        return 0;
 118}
 119static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 120static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 121static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 122static inline void tick_suspend_broadcast(void) { }
 123static inline int tick_resume_broadcast(void) { return 0; }
 124static inline void tick_broadcast_init(void) { }
 125
 126/*
 127 * Set the periodic handler in non broadcast mode
 128 */
 129static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 130                                             int broadcast)
 131{
 132        dev->event_handler = tick_handle_periodic;
 133}
 134#endif /* !BROADCAST */
 135
 136/*
 137 * Check, if the device is functional or a dummy for broadcast
 138 */
 139static inline int tick_device_is_functional(struct clock_event_device *dev)
 140{
 141        return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 142}
 143
 144#endif
 145
 146extern void do_timer(unsigned long ticks);
 147