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 #ifdef CONFIG_GENERIC_CLOCKEVENTS 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) 74 { 75 return 0; 76 } 77 #endif 78 79 static inline void tick_broadcast_enable(void) 80 { 81 tick_broadcast_control(TICK_BROADCAST_ON); 82 } 83 static inline void tick_broadcast_disable(void) 84 { 85 tick_broadcast_control(TICK_BROADCAST_OFF); 86 } 87 static inline void tick_broadcast_force(void) 88 { 89 tick_broadcast_control(TICK_BROADCAST_FORCE); 90 } 91 static inline int tick_broadcast_enter(void) 92 { 93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); 94 } 95 static inline void tick_broadcast_exit(void) 96 { 97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); 98 } 99 100 #ifdef CONFIG_NO_HZ_COMMON 101 extern int tick_nohz_tick_stopped(void); 102 extern void tick_nohz_idle_enter(void); 103 extern void tick_nohz_idle_exit(void); 104 extern void tick_nohz_irq_exit(void); 105 extern ktime_t tick_nohz_get_sleep_length(void); 106 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); 107 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); 108 #else /* !CONFIG_NO_HZ_COMMON */ 109 static inline int tick_nohz_tick_stopped(void) { return 0; } 110 static inline void tick_nohz_idle_enter(void) { } 111 static inline void tick_nohz_idle_exit(void) { } 112 113 static inline ktime_t tick_nohz_get_sleep_length(void) 114 { 115 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; 116 117 return len; 118 } 119 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } 120 static 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 124 extern bool tick_nohz_full_running; 125 extern cpumask_var_t tick_nohz_full_mask; 126 extern cpumask_var_t housekeeping_mask; 127 128 static 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 } 135 136 static 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 } 143 144 static 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 } 149 150 static inline int housekeeping_any_cpu(void) 151 { 152 return cpumask_any_and(housekeeping_mask, cpu_online_mask); 153 } 154 155 extern void tick_nohz_full_kick(void); 156 extern void tick_nohz_full_kick_cpu(int cpu); 157 extern void tick_nohz_full_kick_all(void); 158 extern void __tick_nohz_task_switch(void); 159 #else 160 static inline int housekeeping_any_cpu(void) 161 { 162 return smp_processor_id(); 163 } 164 static inline bool tick_nohz_full_enabled(void) { return false; } 165 static inline bool tick_nohz_full_cpu(int cpu) { return false; } 166 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } 167 static inline void tick_nohz_full_kick_cpu(int cpu) { } 168 static inline void tick_nohz_full_kick(void) { } 169 static inline void tick_nohz_full_kick_all(void) { } 170 static inline void __tick_nohz_task_switch(void) { } 171 #endif 172 173 static 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 } 181 182 static 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 } 190 191 static 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 } 199 200 static inline void tick_nohz_task_switch(void) 201 { 202 if (tick_nohz_full_enabled()) 203 __tick_nohz_task_switch(); 204 } 205 206 #endif 207