Release 4.17 include/linux/tick.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Tick related global functions
 */
#ifndef _LINUX_TICK_H

#define _LINUX_TICK_H

#include <linux/clockchips.h>
#include <linux/irqflags.h>
#include <linux/percpu.h>
#include <linux/context_tracking_state.h>
#include <linux/cpumask.h>
#include <linux/sched.h>

#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern void __init tick_init(void);
/* Should be core only, but ARM BL switcher requires it */
extern void tick_suspend_local(void);
/* Should be core only, but XEN resume magic and ARM BL switcher require it */
extern void tick_resume_local(void);
extern void tick_handover_do_timer(void);
extern void tick_cleanup_dead_cpu(int cpu);
#else /* CONFIG_GENERIC_CLOCKEVENTS */


static inline void tick_init(void) { }
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static inline void tick_suspend_local(void) { }
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static inline void tick_resume_local(void) { }
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static inline void tick_handover_do_timer(void) { }
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static inline void tick_cleanup_dead_cpu(int cpu) { }
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#endif /* !CONFIG_GENERIC_CLOCKEVENTS */

#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
extern void tick_freeze(void);
extern void tick_unfreeze(void);
#else


static inline void tick_freeze(void) { }
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static inline void tick_unfreeze(void) { }
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#endif

#ifdef CONFIG_TICK_ONESHOT
extern void tick_irq_enter(void);
#  ifndef arch_needs_cpu

#   define arch_needs_cpu() (0)
#  endif
# else


static inline void tick_irq_enter(void) { }
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#endif

#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
#else


static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
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#endif


enum tick_broadcast_mode {
	
TICK_BROADCAST_OFF,
	
TICK_BROADCAST_ON,
	
TICK_BROADCAST_FORCE,
};


enum tick_broadcast_state {
	
TICK_BROADCAST_EXIT,
	
TICK_BROADCAST_ENTER,
};

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
extern void tick_broadcast_control(enum tick_broadcast_mode mode);
#else


static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
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#endif /* BROADCAST */

#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
#else


static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
{
	return 0;
}
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#endif



static inline void tick_broadcast_enable(void)
{
	tick_broadcast_control(TICK_BROADCAST_ON);
}
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static inline void tick_broadcast_disable(void)
{
	tick_broadcast_control(TICK_BROADCAST_OFF);
}
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static inline void tick_broadcast_force(void)
{
	tick_broadcast_control(TICK_BROADCAST_FORCE);
}
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static inline int tick_broadcast_enter(void)
{
	return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
}
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static inline void tick_broadcast_exit(void)
{
	tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
}

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enum tick_dep_bits {
	
TICK_DEP_BIT_POSIX_TIMER	= 0,
	
TICK_DEP_BIT_PERF_EVENTS	= 1,
	
TICK_DEP_BIT_SCHED		= 2,
	
TICK_DEP_BIT_CLOCK_UNSTABLE	= 3
};


#define TICK_DEP_MASK_NONE		0

#define TICK_DEP_MASK_POSIX_TIMER	(1 << TICK_DEP_BIT_POSIX_TIMER)

#define TICK_DEP_MASK_PERF_EVENTS	(1 << TICK_DEP_BIT_PERF_EVENTS)

#define TICK_DEP_MASK_SCHED		(1 << TICK_DEP_BIT_SCHED)

#define TICK_DEP_MASK_CLOCK_UNSTABLE	(1 << TICK_DEP_BIT_CLOCK_UNSTABLE)

#ifdef CONFIG_NO_HZ_COMMON
extern bool tick_nohz_enabled;
extern bool tick_nohz_tick_stopped(void);
extern bool tick_nohz_tick_stopped_cpu(int cpu);
extern void tick_nohz_idle_stop_tick(void);
extern void tick_nohz_idle_retain_tick(void);
extern void tick_nohz_idle_restart_tick(void);
extern void tick_nohz_idle_enter(void);
extern void tick_nohz_idle_exit(void);
extern void tick_nohz_irq_exit(void);
extern bool tick_nohz_idle_got_tick(void);
extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
extern unsigned long tick_nohz_get_idle_calls(void);
extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);



static inline void tick_nohz_idle_stop_tick_protected(void)
{
	local_irq_disable();
	tick_nohz_idle_stop_tick();
	local_irq_enable();
}

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#else /* !CONFIG_NO_HZ_COMMON */

#define tick_nohz_enabled (0)


static inline int tick_nohz_tick_stopped(void) { return 0; }
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static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
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static inline void tick_nohz_idle_stop_tick(void) { }
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static inline void tick_nohz_idle_retain_tick(void) { }
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static inline void tick_nohz_idle_restart_tick(void) { }
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static inline void tick_nohz_idle_enter(void) { }
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static inline void tick_nohz_idle_exit(void) { }
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static inline bool tick_nohz_idle_got_tick(void) { return false; }

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static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
{
	*delta_next = TICK_NSEC;
	return *delta_next;
}
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static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
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static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }

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static inline void tick_nohz_idle_stop_tick_protected(void) { }
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#endif /* !CONFIG_NO_HZ_COMMON */

#ifdef CONFIG_NO_HZ_FULL
extern bool tick_nohz_full_running;
extern cpumask_var_t tick_nohz_full_mask;



static inline bool tick_nohz_full_enabled(void)
{
	if (!context_tracking_is_enabled())
		return false;

	return tick_nohz_full_running;
}

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static inline bool tick_nohz_full_cpu(int cpu)
{
	if (!tick_nohz_full_enabled())
		return false;

	return cpumask_test_cpu(cpu, tick_nohz_full_mask);
}

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static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
{
	if (tick_nohz_full_enabled())
		cpumask_or(mask, mask, tick_nohz_full_mask);
}

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extern void tick_nohz_dep_set(enum tick_dep_bits bit);
extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
extern void tick_nohz_dep_set_task(struct task_struct *tsk,
				   enum tick_dep_bits bit);
extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
				     enum tick_dep_bits bit);
extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
				     enum tick_dep_bits bit);
extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
				       enum tick_dep_bits bit);

/*
 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
 * on top of static keys.
 */


static inline void tick_dep_set(enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_set(bit);
}

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static inline void tick_dep_clear(enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_clear(bit);
}

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static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
{
	if (tick_nohz_full_cpu(cpu))
		tick_nohz_dep_set_cpu(cpu, bit);
}

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static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
{
	if (tick_nohz_full_cpu(cpu))
		tick_nohz_dep_clear_cpu(cpu, bit);
}

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static inline void tick_dep_set_task(struct task_struct *tsk,
				     enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_set_task(tsk, bit);
}
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static inline void tick_dep_clear_task(struct task_struct *tsk,
				       enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_clear_task(tsk, bit);
}
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static inline void tick_dep_set_signal(struct signal_struct *signal,
				       enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_set_signal(signal, bit);
}
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static inline void tick_dep_clear_signal(struct signal_struct *signal,
					 enum tick_dep_bits bit)
{
	if (tick_nohz_full_enabled())
		tick_nohz_dep_clear_signal(signal, bit);
}

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extern void tick_nohz_full_kick_cpu(int cpu);
extern void __tick_nohz_task_switch(void);
extern void __init tick_nohz_full_setup(cpumask_var_t cpumask);
#else


static inline bool tick_nohz_full_enabled(void) { return false; }
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static inline bool tick_nohz_full_cpu(int cpu) { return false; }
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static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }

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static inline void tick_dep_set(enum tick_dep_bits bit) { }
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static inline void tick_dep_clear(enum tick_dep_bits bit) { }
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static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
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static inline void tick_dep_set_task(struct task_struct *tsk,
				     enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_task(struct task_struct *tsk,
				       enum tick_dep_bits bit) { }
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static inline void tick_dep_set_signal(struct signal_struct *signal,
				       enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_signal(struct signal_struct *signal,
					 enum tick_dep_bits bit) { }

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static inline void tick_nohz_full_kick_cpu(int cpu) { }
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static inline void __tick_nohz_task_switch(void) { }
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static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
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#endif



static inline void tick_nohz_task_switch(void)
{
	if (tick_nohz_full_enabled())
		__tick_nohz_task_switch();
}

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#endif
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Frédéric Weisbecker 686 52.41% 23 39.66%
Thomas Gleixner 282 21.54% 13 22.41%
Rafael J. Wysocki 150 11.46% 7 12.07%
Chris Metcalf 37 2.83% 1 1.72%
Preeti U. Murthy 32 2.44% 1 1.72%
Venkatesh Pallipadi 30 2.29% 2 3.45%
Arjan van de Ven 30 2.29% 1 1.72%
Ingo Molnar 15 1.15% 1 1.72%
Len Brown 14 1.07% 1 1.72%
Martin Schwidefsky 10 0.76% 2 3.45%
Joel Fernandes 9 0.69% 1 1.72%
Jean Delvare 7 0.53% 1 1.72%
Paul E. McKenney 3 0.23% 1 1.72%
Youquan Song 2 0.15% 1 1.72%
Greg Kroah-Hartman 1 0.08% 1 1.72%
Kees Cook 1 0.08% 1 1.72%
Total 1309 100.00% 58 100.00%
Directory: include/linux

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cregit-Linux how code gets into the kernel

Release 4.17 include/linux/tick.h

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