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