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
   7#include "timekeeping.h"
   8
   9extern seqlock_t jiffies_lock;
  10
  11#define CS_NAME_LEN     32
  12
  13#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
  14
  15#define TICK_DO_TIMER_NONE      -1
  16#define TICK_DO_TIMER_BOOT      -2
  17
  18DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  19extern ktime_t tick_next_period;
  20extern ktime_t tick_period;
  21extern int tick_do_timer_cpu __read_mostly;
  22
  23extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  24extern void tick_handle_periodic(struct clock_event_device *dev);
  25extern void tick_check_new_device(struct clock_event_device *dev);
  26extern void tick_handover_do_timer(int *cpup);
  27extern void tick_shutdown(unsigned int *cpup);
  28extern void tick_suspend(void);
  29extern void tick_resume(void);
  30extern bool tick_check_replacement(struct clock_event_device *curdev,
  31                                   struct clock_event_device *newdev);
  32extern void tick_install_replacement(struct clock_event_device *dev);
  33
  34extern void clockevents_shutdown(struct clock_event_device *dev);
  35
  36extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
  37
  38/*
  39 * NO_HZ / high resolution timer shared code
  40 */
  41#ifdef CONFIG_TICK_ONESHOT
  42extern void tick_setup_oneshot(struct clock_event_device *newdev,
  43                               void (*handler)(struct clock_event_device *),
  44                               ktime_t nextevt);
  45extern int tick_program_event(ktime_t expires, int force);
  46extern void tick_oneshot_notify(void);
  47extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  48extern void tick_resume_oneshot(void);
  49# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  50extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  51extern int tick_broadcast_oneshot_control(unsigned long reason);
  52extern void tick_broadcast_switch_to_oneshot(void);
  53extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  54extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  55extern int tick_broadcast_oneshot_active(void);
  56extern void tick_check_oneshot_broadcast_this_cpu(void);
  57bool tick_broadcast_oneshot_available(void);
  58# else /* BROADCAST */
  59static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  60{
  61        BUG();
  62}
  63static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
  64static inline void tick_broadcast_switch_to_oneshot(void) { }
  65static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  66static inline int tick_broadcast_oneshot_active(void) { return 0; }
  67static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
  68static inline bool tick_broadcast_oneshot_available(void) { return true; }
  69# endif /* !BROADCAST */
  70
  71#else /* !ONESHOT */
  72static inline
  73void tick_setup_oneshot(struct clock_event_device *newdev,
  74                        void (*handler)(struct clock_event_device *),
  75                        ktime_t nextevt)
  76{
  77        BUG();
  78}
  79static inline void tick_resume_oneshot(void)
  80{
  81        BUG();
  82}
  83static inline int tick_program_event(ktime_t expires, int force)
  84{
  85        return 0;
  86}
  87static inline void tick_oneshot_notify(void) { }
  88static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  89{
  90        BUG();
  91}
  92static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
  93static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  94static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  95{
  96        return 0;
  97}
  98static inline int tick_broadcast_oneshot_active(void) { return 0; }
  99static inline bool tick_broadcast_oneshot_available(void) { return false; }
 100#endif /* !TICK_ONESHOT */
 101
 102/* NO_HZ_FULL internal */
 103#ifdef CONFIG_NO_HZ_FULL
 104extern void tick_nohz_init(void);
 105# else
 106static inline void tick_nohz_init(void) { }
 107#endif
 108
 109/*
 110 * Broadcasting support
 111 */
 112#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 113extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 114extern void tick_install_broadcast_device(struct clock_event_device *dev);
 115extern int tick_is_broadcast_device(struct clock_event_device *dev);
 116extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
 117extern void tick_shutdown_broadcast(unsigned int *cpup);
 118extern void tick_suspend_broadcast(void);
 119extern int tick_resume_broadcast(void);
 120extern void tick_broadcast_init(void);
 121extern void
 122tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 123int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 124
 125#else /* !BROADCAST */
 126
 127static inline void tick_install_broadcast_device(struct clock_event_device *dev)
 128{
 129}
 130
 131static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 132{
 133        return 0;
 134}
 135static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 136                                             int cpu)
 137{
 138        return 0;
 139}
 140static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 141static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 142static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 143static inline void tick_suspend_broadcast(void) { }
 144static inline int tick_resume_broadcast(void) { return 0; }
 145static inline void tick_broadcast_init(void) { }
 146static inline int tick_broadcast_update_freq(struct clock_event_device *dev,
 147                                             u32 freq) { return -ENODEV; }
 148
 149/*
 150 * Set the periodic handler in non broadcast mode
 151 */
 152static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 153                                             int broadcast)
 154{
 155        dev->event_handler = tick_handle_periodic;
 156}
 157#endif /* !BROADCAST */
 158
 159/*
 160 * Check, if the device is functional or a dummy for broadcast
 161 */
 162static inline int tick_device_is_functional(struct clock_event_device *dev)
 163{
 164        return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 165}
 166
 167int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 168
 169#endif
 170
 171extern void do_timer(unsigned long ticks);
 172extern void update_wall_time(void);
 173