200 lines
7.9 KiB
C
200 lines
7.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* tick internal variable and functions used by low/high res code
|
|
*/
|
|
#include <linux/hrtimer.h>
|
|
#include <linux/tick.h>
|
|
|
|
#include "timekeeping.h"
|
|
#include "tick-sched.h"
|
|
|
|
#ifdef CONFIG_GENERIC_CLOCKEVENTS
|
|
|
|
# define TICK_DO_TIMER_NONE -1
|
|
# define TICK_DO_TIMER_BOOT -2
|
|
|
|
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
|
|
extern ktime_t tick_next_period;
|
|
extern int tick_do_timer_cpu __read_mostly;
|
|
|
|
extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
|
|
extern void tick_handle_periodic(struct clock_event_device *dev);
|
|
extern void tick_check_new_device(struct clock_event_device *dev);
|
|
extern void tick_shutdown(unsigned int cpu);
|
|
extern void tick_suspend(void);
|
|
extern void tick_resume(void);
|
|
extern bool tick_check_replacement(struct clock_event_device *curdev,
|
|
struct clock_event_device *newdev);
|
|
extern void tick_install_replacement(struct clock_event_device *dev);
|
|
extern int tick_is_oneshot_available(void);
|
|
extern struct tick_device *tick_get_device(int cpu);
|
|
|
|
extern int clockevents_tick_resume(struct clock_event_device *dev);
|
|
/* Check, if the device is functional or a dummy for broadcast */
|
|
static inline int tick_device_is_functional(struct clock_event_device *dev)
|
|
{
|
|
return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
|
|
}
|
|
|
|
static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
|
|
{
|
|
return dev->state_use_accessors;
|
|
}
|
|
|
|
static inline void clockevent_set_state(struct clock_event_device *dev,
|
|
enum clock_event_state state)
|
|
{
|
|
dev->state_use_accessors = state;
|
|
}
|
|
|
|
extern void clockevents_shutdown(struct clock_event_device *dev);
|
|
extern void clockevents_exchange_device(struct clock_event_device *old,
|
|
struct clock_event_device *new);
|
|
extern void clockevents_switch_state(struct clock_event_device *dev,
|
|
enum clock_event_state state);
|
|
extern int clockevents_program_event(struct clock_event_device *dev,
|
|
ktime_t expires, bool force);
|
|
extern void clockevents_handle_noop(struct clock_event_device *dev);
|
|
extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
|
|
extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
|
|
|
|
/* Broadcasting support */
|
|
# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
|
|
extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
|
|
extern void tick_install_broadcast_device(struct clock_event_device *dev, int cpu);
|
|
extern int tick_is_broadcast_device(struct clock_event_device *dev);
|
|
extern void tick_suspend_broadcast(void);
|
|
extern void tick_resume_broadcast(void);
|
|
extern bool tick_resume_check_broadcast(void);
|
|
extern void tick_broadcast_init(void);
|
|
extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
|
|
extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
|
|
extern struct tick_device *tick_get_broadcast_device(void);
|
|
extern struct cpumask *tick_get_broadcast_mask(void);
|
|
extern const struct clock_event_device *tick_get_wakeup_device(int cpu);
|
|
# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
|
|
static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { }
|
|
static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
|
|
static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
|
|
static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
|
|
static inline void tick_suspend_broadcast(void) { }
|
|
static inline void tick_resume_broadcast(void) { }
|
|
static inline bool tick_resume_check_broadcast(void) { return false; }
|
|
static inline void tick_broadcast_init(void) { }
|
|
static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
|
|
|
|
/* Set the periodic handler in non broadcast mode */
|
|
static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
|
|
{
|
|
dev->event_handler = tick_handle_periodic;
|
|
}
|
|
# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
|
|
|
|
#else /* !GENERIC_CLOCKEVENTS: */
|
|
static inline void tick_suspend(void) { }
|
|
static inline void tick_resume(void) { }
|
|
#endif /* !GENERIC_CLOCKEVENTS */
|
|
|
|
/* Oneshot related functions */
|
|
#ifdef CONFIG_TICK_ONESHOT
|
|
extern void tick_setup_oneshot(struct clock_event_device *newdev,
|
|
void (*handler)(struct clock_event_device *),
|
|
ktime_t nextevt);
|
|
extern int tick_program_event(ktime_t expires, int force);
|
|
extern void tick_oneshot_notify(void);
|
|
extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
|
|
extern void tick_resume_oneshot(void);
|
|
static inline bool tick_oneshot_possible(void) { return true; }
|
|
extern int tick_oneshot_mode_active(void);
|
|
extern void tick_clock_notify(void);
|
|
extern int tick_check_oneshot_change(int allow_nohz);
|
|
extern int tick_init_highres(void);
|
|
#else /* !CONFIG_TICK_ONESHOT: */
|
|
static inline
|
|
void tick_setup_oneshot(struct clock_event_device *newdev,
|
|
void (*handler)(struct clock_event_device *),
|
|
ktime_t nextevt) { BUG(); }
|
|
static inline void tick_resume_oneshot(void) { BUG(); }
|
|
static inline int tick_program_event(ktime_t expires, int force) { return 0; }
|
|
static inline void tick_oneshot_notify(void) { }
|
|
static inline bool tick_oneshot_possible(void) { return false; }
|
|
static inline int tick_oneshot_mode_active(void) { return 0; }
|
|
static inline void tick_clock_notify(void) { }
|
|
static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
|
|
#endif /* !CONFIG_TICK_ONESHOT */
|
|
|
|
/* Functions related to oneshot broadcasting */
|
|
#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
|
|
extern void tick_broadcast_switch_to_oneshot(void);
|
|
extern int tick_broadcast_oneshot_active(void);
|
|
extern void tick_check_oneshot_broadcast_this_cpu(void);
|
|
bool tick_broadcast_oneshot_available(void);
|
|
extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
|
|
#else /* !(BROADCAST && ONESHOT): */
|
|
static inline void tick_broadcast_switch_to_oneshot(void) { }
|
|
static inline int tick_broadcast_oneshot_active(void) { return 0; }
|
|
static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
|
|
static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
|
|
#endif /* !(BROADCAST && ONESHOT) */
|
|
|
|
#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
|
|
extern void tick_broadcast_offline(unsigned int cpu);
|
|
#else
|
|
static inline void tick_broadcast_offline(unsigned int cpu) { }
|
|
#endif
|
|
|
|
/* NO_HZ_FULL internal */
|
|
#ifdef CONFIG_NO_HZ_FULL
|
|
extern void tick_nohz_init(void);
|
|
# else
|
|
static inline void tick_nohz_init(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_NO_HZ_COMMON
|
|
extern unsigned long tick_nohz_active;
|
|
extern void timers_update_nohz(void);
|
|
# ifdef CONFIG_SMP
|
|
extern struct static_key_false timers_migration_enabled;
|
|
# endif
|
|
#else /* CONFIG_NO_HZ_COMMON */
|
|
static inline void timers_update_nohz(void) { }
|
|
#define tick_nohz_active (0)
|
|
#endif
|
|
|
|
DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
|
|
|
|
extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
|
|
void timer_clear_idle(void);
|
|
|
|
#define CLOCK_SET_WALL \
|
|
(BIT(HRTIMER_BASE_REALTIME) | BIT(HRTIMER_BASE_REALTIME_SOFT) | \
|
|
BIT(HRTIMER_BASE_TAI) | BIT(HRTIMER_BASE_TAI_SOFT))
|
|
|
|
#define CLOCK_SET_BOOT \
|
|
(BIT(HRTIMER_BASE_BOOTTIME) | BIT(HRTIMER_BASE_BOOTTIME_SOFT))
|
|
|
|
void clock_was_set(unsigned int bases);
|
|
void clock_was_set_delayed(void);
|
|
|
|
void hrtimers_resume_local(void);
|
|
|
|
/* Since jiffies uses a simple TICK_NSEC multiplier
|
|
* conversion, the .shift value could be zero. However
|
|
* this would make NTP adjustments impossible as they are
|
|
* in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to
|
|
* shift both the nominator and denominator the same
|
|
* amount, and give ntp adjustments in units of 1/2^8
|
|
*
|
|
* The value 8 is somewhat carefully chosen, as anything
|
|
* larger can result in overflows. TICK_NSEC grows as HZ
|
|
* shrinks, so values greater than 8 overflow 32bits when
|
|
* HZ=100.
|
|
*/
|
|
#if HZ < 34
|
|
#define JIFFIES_SHIFT 6
|
|
#elif HZ < 67
|
|
#define JIFFIES_SHIFT 7
|
|
#else
|
|
#define JIFFIES_SHIFT 8
|
|
#endif
|