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