317 lines
9.9 KiB
C
317 lines
9.9 KiB
C
/* 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>
|
|
#include <linux/rcupdate.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) { }
|
|
static inline void tick_suspend_local(void) { }
|
|
static inline void tick_resume_local(void) { }
|
|
static inline void tick_handover_do_timer(void) { }
|
|
static inline void tick_cleanup_dead_cpu(int cpu) { }
|
|
#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) { }
|
|
static inline void tick_unfreeze(void) { }
|
|
#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) { }
|
|
#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) { }
|
|
#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) { }
|
|
#endif /* BROADCAST */
|
|
|
|
#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
|
|
extern void tick_offline_cpu(unsigned int cpu);
|
|
#else
|
|
static inline void tick_offline_cpu(unsigned int cpu) { }
|
|
#endif
|
|
|
|
#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;
|
|
}
|
|
#endif
|
|
|
|
static inline void tick_broadcast_enable(void)
|
|
{
|
|
tick_broadcast_control(TICK_BROADCAST_ON);
|
|
}
|
|
static inline void tick_broadcast_disable(void)
|
|
{
|
|
tick_broadcast_control(TICK_BROADCAST_OFF);
|
|
}
|
|
static inline void tick_broadcast_force(void)
|
|
{
|
|
tick_broadcast_control(TICK_BROADCAST_FORCE);
|
|
}
|
|
static inline int tick_broadcast_enter(void)
|
|
{
|
|
return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
|
|
}
|
|
static inline void tick_broadcast_exit(void)
|
|
{
|
|
tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
|
|
}
|
|
|
|
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,
|
|
TICK_DEP_BIT_RCU = 4,
|
|
TICK_DEP_BIT_RCU_EXP = 5
|
|
};
|
|
#define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP
|
|
|
|
#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)
|
|
#define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU)
|
|
#define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP)
|
|
|
|
#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_next_hrtimer(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();
|
|
}
|
|
|
|
#else /* !CONFIG_NO_HZ_COMMON */
|
|
#define tick_nohz_enabled (0)
|
|
static inline int tick_nohz_tick_stopped(void) { return 0; }
|
|
static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
|
|
static inline void tick_nohz_idle_stop_tick(void) { }
|
|
static inline void tick_nohz_idle_retain_tick(void) { }
|
|
static inline void tick_nohz_idle_restart_tick(void) { }
|
|
static inline void tick_nohz_idle_enter(void) { }
|
|
static inline void tick_nohz_idle_exit(void) { }
|
|
static inline bool tick_nohz_idle_got_tick(void) { return false; }
|
|
static inline ktime_t tick_nohz_get_next_hrtimer(void)
|
|
{
|
|
/* Next wake up is the tick period, assume it starts now */
|
|
return ktime_add(ktime_get(), TICK_NSEC);
|
|
}
|
|
static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
|
|
{
|
|
*delta_next = TICK_NSEC;
|
|
return *delta_next;
|
|
}
|
|
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
|
|
static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
|
|
|
|
static inline void tick_nohz_idle_stop_tick_protected(void) { }
|
|
#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_enabled())
|
|
return false;
|
|
|
|
return tick_nohz_full_running;
|
|
}
|
|
|
|
/*
|
|
* Check if a CPU is part of the nohz_full subset. Arrange for evaluating
|
|
* the cpu expression (typically smp_processor_id()) _after_ the static
|
|
* key.
|
|
*/
|
|
#define tick_nohz_full_cpu(_cpu) ({ \
|
|
bool __ret = false; \
|
|
if (tick_nohz_full_enabled()) \
|
|
__ret = cpumask_test_cpu((_cpu), tick_nohz_full_mask); \
|
|
__ret; \
|
|
})
|
|
|
|
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);
|
|
}
|
|
|
|
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 task_struct *tsk,
|
|
enum tick_dep_bits bit);
|
|
extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
|
|
enum tick_dep_bits bit);
|
|
extern bool tick_nohz_cpu_hotpluggable(unsigned int cpu);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
static inline void tick_dep_clear(enum tick_dep_bits bit)
|
|
{
|
|
if (tick_nohz_full_enabled())
|
|
tick_nohz_dep_clear(bit);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
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);
|
|
}
|
|
static inline void tick_dep_set_signal(struct task_struct *tsk,
|
|
enum tick_dep_bits bit)
|
|
{
|
|
if (tick_nohz_full_enabled())
|
|
tick_nohz_dep_set_signal(tsk, bit);
|
|
}
|
|
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);
|
|
}
|
|
|
|
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; }
|
|
static inline bool tick_nohz_full_cpu(int cpu) { return false; }
|
|
static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
|
|
|
|
static inline void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
|
|
static inline void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
|
|
static inline bool tick_nohz_cpu_hotpluggable(unsigned int cpu) { return true; }
|
|
|
|
static inline void tick_dep_set(enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_clear(enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_set_task(struct task_struct *tsk,
|
|
enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_clear_task(struct task_struct *tsk,
|
|
enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_set_signal(struct task_struct *tsk,
|
|
enum tick_dep_bits bit) { }
|
|
static inline void tick_dep_clear_signal(struct signal_struct *signal,
|
|
enum tick_dep_bits bit) { }
|
|
|
|
static inline void tick_nohz_full_kick_cpu(int cpu) { }
|
|
static inline void __tick_nohz_task_switch(void) { }
|
|
static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
|
|
#endif
|
|
|
|
static inline void tick_nohz_task_switch(void)
|
|
{
|
|
if (tick_nohz_full_enabled())
|
|
__tick_nohz_task_switch();
|
|
}
|
|
|
|
static inline void tick_nohz_user_enter_prepare(void)
|
|
{
|
|
if (tick_nohz_full_cpu(smp_processor_id()))
|
|
rcu_nocb_flush_deferred_wakeup();
|
|
}
|
|
|
|
#endif
|