1/* 2 * Tick related global functions 3 */ 4#ifndef _LINUX_TICK_H 5#define _LINUX_TICK_H 6 7#include <linux/clockchips.h> 8#include <linux/irqflags.h> 9#include <linux/percpu.h> 10#include <linux/context_tracking_state.h> 11#include <linux/cpumask.h> 12#include <linux/sched.h> 13 14#ifdef CONFIG_GENERIC_CLOCKEVENTS 15extern void __init tick_init(void); 16/* Should be core only, but ARM BL switcher requires it */ 17extern void tick_suspend_local(void); 18/* Should be core only, but XEN resume magic and ARM BL switcher require it */ 19extern void tick_resume_local(void); 20extern void tick_handover_do_timer(void); 21extern void tick_cleanup_dead_cpu(int cpu); 22#else /* CONFIG_GENERIC_CLOCKEVENTS */ 23static inline void tick_init(void) { } 24static inline void tick_suspend_local(void) { } 25static inline void tick_resume_local(void) { } 26static inline void tick_handover_do_timer(void) { } 27static inline void tick_cleanup_dead_cpu(int cpu) { } 28#endif /* !CONFIG_GENERIC_CLOCKEVENTS */ 29 30#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND) 31extern void tick_freeze(void); 32extern void tick_unfreeze(void); 33#else 34static inline void tick_freeze(void) { } 35static inline void tick_unfreeze(void) { } 36#endif 37 38#ifdef CONFIG_TICK_ONESHOT 39extern void tick_irq_enter(void); 40# ifndef arch_needs_cpu 41# define arch_needs_cpu() (0) 42# endif 43# else 44static inline void tick_irq_enter(void) { } 45#endif 46 47#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 48extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu); 49#else 50static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { } 51#endif 52 53enum tick_broadcast_mode { 54 TICK_BROADCAST_OFF, 55 TICK_BROADCAST_ON, 56 TICK_BROADCAST_FORCE, 57}; 58 59enum tick_broadcast_state { 60 TICK_BROADCAST_EXIT, 61 TICK_BROADCAST_ENTER, 62}; 63 64#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 65extern void tick_broadcast_control(enum tick_broadcast_mode mode); 66#else 67static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { } 68#endif /* BROADCAST */ 69 70#ifdef CONFIG_GENERIC_CLOCKEVENTS 71extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state); 72#else 73static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) 74{ 75 return 0; 76} 77#endif 78 79static inline void tick_broadcast_enable(void) 80{ 81 tick_broadcast_control(TICK_BROADCAST_ON); 82} 83static inline void tick_broadcast_disable(void) 84{ 85 tick_broadcast_control(TICK_BROADCAST_OFF); 86} 87static inline void tick_broadcast_force(void) 88{ 89 tick_broadcast_control(TICK_BROADCAST_FORCE); 90} 91static inline int tick_broadcast_enter(void) 92{ 93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); 94} 95static inline void tick_broadcast_exit(void) 96{ 97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); 98} 99 100#ifdef CONFIG_NO_HZ_COMMON 101extern int tick_nohz_tick_stopped(void); 102extern void tick_nohz_idle_enter(void); 103extern void tick_nohz_idle_exit(void); 104extern void tick_nohz_irq_exit(void); 105extern ktime_t tick_nohz_get_sleep_length(void); 106extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); 107extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); 108#else /* !CONFIG_NO_HZ_COMMON */ 109static inline int tick_nohz_tick_stopped(void) { return 0; } 110static inline void tick_nohz_idle_enter(void) { } 111static inline void tick_nohz_idle_exit(void) { } 112 113static inline ktime_t tick_nohz_get_sleep_length(void) 114{ 115 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; 116 117 return len; 118} 119static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } 120static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } 121#endif /* !CONFIG_NO_HZ_COMMON */ 122 123#ifdef CONFIG_NO_HZ_FULL 124extern bool tick_nohz_full_running; 125extern cpumask_var_t tick_nohz_full_mask; 126extern cpumask_var_t housekeeping_mask; 127 128static inline bool tick_nohz_full_enabled(void) 129{ 130 if (!context_tracking_is_enabled()) 131 return false; 132 133 return tick_nohz_full_running; 134} 135 136static inline bool tick_nohz_full_cpu(int cpu) 137{ 138 if (!tick_nohz_full_enabled()) 139 return false; 140 141 return cpumask_test_cpu(cpu, tick_nohz_full_mask); 142} 143 144static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) 145{ 146 if (tick_nohz_full_enabled()) 147 cpumask_or(mask, mask, tick_nohz_full_mask); 148} 149 150static inline int housekeeping_any_cpu(void) 151{ 152 return cpumask_any_and(housekeeping_mask, cpu_online_mask); 153} 154 155extern void tick_nohz_full_kick(void); 156extern void tick_nohz_full_kick_cpu(int cpu); 157extern void tick_nohz_full_kick_all(void); 158extern void __tick_nohz_task_switch(void); 159#else 160static inline int housekeeping_any_cpu(void) 161{ 162 return smp_processor_id(); 163} 164static inline bool tick_nohz_full_enabled(void) { return false; } 165static inline bool tick_nohz_full_cpu(int cpu) { return false; } 166static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } 167static inline void tick_nohz_full_kick_cpu(int cpu) { } 168static inline void tick_nohz_full_kick(void) { } 169static inline void tick_nohz_full_kick_all(void) { } 170static inline void __tick_nohz_task_switch(void) { } 171#endif 172 173static inline const struct cpumask *housekeeping_cpumask(void) 174{ 175#ifdef CONFIG_NO_HZ_FULL 176 if (tick_nohz_full_enabled()) 177 return housekeeping_mask; 178#endif 179 return cpu_possible_mask; 180} 181 182static inline bool is_housekeeping_cpu(int cpu) 183{ 184#ifdef CONFIG_NO_HZ_FULL 185 if (tick_nohz_full_enabled()) 186 return cpumask_test_cpu(cpu, housekeeping_mask); 187#endif 188 return true; 189} 190 191static inline void housekeeping_affine(struct task_struct *t) 192{ 193#ifdef CONFIG_NO_HZ_FULL 194 if (tick_nohz_full_enabled()) 195 set_cpus_allowed_ptr(t, housekeeping_mask); 196 197#endif 198} 199 200static inline void tick_nohz_task_switch(void) 201{ 202 if (tick_nohz_full_enabled()) 203 __tick_nohz_task_switch(); 204} 205 206#endif 207