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

  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#include "tick-sched.h"
  9
 10#ifdef CONFIG_GENERIC_CLOCKEVENTS
 11
 12# define TICK_DO_TIMER_NONE	-1
 13# define TICK_DO_TIMER_BOOT	-2
 
 
 14
 15DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 16extern ktime_t tick_next_period;
 17extern ktime_t tick_period;
 18extern int tick_do_timer_cpu __read_mostly;
 19
 20extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
 21extern void tick_handle_periodic(struct clock_event_device *dev);
 22extern void tick_check_new_device(struct clock_event_device *dev);
 23extern void tick_shutdown(unsigned int cpu);
 
 24extern void tick_suspend(void);
 25extern void tick_resume(void);
 26extern bool tick_check_replacement(struct clock_event_device *curdev,
 27				   struct clock_event_device *newdev);
 28extern void tick_install_replacement(struct clock_event_device *dev);
 29extern int tick_is_oneshot_available(void);
 30extern struct tick_device *tick_get_device(int cpu);
 31
 32extern int clockevents_tick_resume(struct clock_event_device *dev);
 33/* Check, if the device is functional or a dummy for broadcast */
 34static inline int tick_device_is_functional(struct clock_event_device *dev)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 35{
 36	return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 37}
 
 
 
 
 
 
 
 38
 39static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
 
 
 
 
 
 
 
 
 
 
 
 
 40{
 41	return dev->state_use_accessors;
 42}
 43
 44static inline void clockevent_set_state(struct clock_event_device *dev,
 45					enum clock_event_state state)
 
 
 
 
 
 46{
 47	dev->state_use_accessors = state;
 48}
 
 
 
 49
 50extern void clockevents_shutdown(struct clock_event_device *dev);
 51extern void clockevents_exchange_device(struct clock_event_device *old,
 52					struct clock_event_device *new);
 53extern void clockevents_switch_state(struct clock_event_device *dev,
 54				     enum clock_event_state state);
 55extern int clockevents_program_event(struct clock_event_device *dev,
 56				     ktime_t expires, bool force);
 57extern void clockevents_handle_noop(struct clock_event_device *dev);
 58extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 59extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
 60
 61/* Broadcasting support */
 62# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 63extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 64extern void tick_install_broadcast_device(struct clock_event_device *dev);
 65extern int tick_is_broadcast_device(struct clock_event_device *dev);
 66extern void tick_shutdown_broadcast(unsigned int cpu);
 
 67extern void tick_suspend_broadcast(void);
 68extern void tick_resume_broadcast(void);
 69extern bool tick_resume_check_broadcast(void);
 70extern void tick_broadcast_init(void);
 71extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 72extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 73extern struct tick_device *tick_get_broadcast_device(void);
 74extern struct cpumask *tick_get_broadcast_mask(void);
 75# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
 76static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
 77static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
 78static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
 
 
 
 
 
 
 
 
 
 
 
 79static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 80static inline void tick_shutdown_broadcast(unsigned int cpu) { }
 
 81static inline void tick_suspend_broadcast(void) { }
 82static inline void tick_resume_broadcast(void) { }
 83static inline bool tick_resume_check_broadcast(void) { return false; }
 84static inline void tick_broadcast_init(void) { }
 85static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
 
 86
 87/* Set the periodic handler in non broadcast mode */
 88static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
 
 
 
 89{
 90	dev->event_handler = tick_handle_periodic;
 91}
 92# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
 93
 94#else /* !GENERIC_CLOCKEVENTS: */
 95static inline void tick_suspend(void) { }
 96static inline void tick_resume(void) { }
 97#endif /* !GENERIC_CLOCKEVENTS */
 
 
 
 98
 99/* Oneshot related functions */
100#ifdef CONFIG_TICK_ONESHOT
101extern void tick_setup_oneshot(struct clock_event_device *newdev,
102			       void (*handler)(struct clock_event_device *),
103			       ktime_t nextevt);
104extern int tick_program_event(ktime_t expires, int force);
105extern void tick_oneshot_notify(void);
106extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
107extern void tick_resume_oneshot(void);
108static inline bool tick_oneshot_possible(void) { return true; }
109extern int tick_oneshot_mode_active(void);
110extern void tick_clock_notify(void);
111extern int tick_check_oneshot_change(int allow_nohz);
112extern int tick_init_highres(void);
113#else /* !CONFIG_TICK_ONESHOT: */
114static inline
115void tick_setup_oneshot(struct clock_event_device *newdev,
116			void (*handler)(struct clock_event_device *),
117			ktime_t nextevt) { BUG(); }
118static inline void tick_resume_oneshot(void) { BUG(); }
119static inline int tick_program_event(ktime_t expires, int force) { return 0; }
120static inline void tick_oneshot_notify(void) { }
121static inline bool tick_oneshot_possible(void) { return false; }
122static inline int tick_oneshot_mode_active(void) { return 0; }
123static inline void tick_clock_notify(void) { }
124static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
125#endif /* !CONFIG_TICK_ONESHOT */
126
127/* Functions related to oneshot broadcasting */
128#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
129extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
130extern void tick_broadcast_switch_to_oneshot(void);
131extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
132extern int tick_broadcast_oneshot_active(void);
133extern void tick_check_oneshot_broadcast_this_cpu(void);
134bool tick_broadcast_oneshot_available(void);
135extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
136#else /* !(BROADCAST && ONESHOT): */
137static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }
138static inline void tick_broadcast_switch_to_oneshot(void) { }
139static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
140static inline int tick_broadcast_oneshot_active(void) { return 0; }
141static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
142static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
143#endif /* !(BROADCAST && ONESHOT) */
144
145/* NO_HZ_FULL internal */
146#ifdef CONFIG_NO_HZ_FULL
147extern void tick_nohz_init(void);
148# else
149static inline void tick_nohz_init(void) { }
150#endif
151
152#ifdef CONFIG_NO_HZ_COMMON
153extern unsigned long tick_nohz_active;
154#else
155#define tick_nohz_active (0)
156#endif
157
158#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
159extern void timers_update_migration(bool update_nohz);
160#else
161static inline void timers_update_migration(bool update_nohz) { }
162#endif
163
164DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
165
166extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);