1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Tick related global functions 4 */ 5 #ifndef _LINUX_TICK_H 6 #define _LINUX_TICK_H 7 8 #include <linux/clockchips.h> 9 #include <linux/irqflags.h> 10 #include <linux/percpu.h> 11 #include <linux/context_tracking_state.h> 12 #include <linux/cpumask.h> 13 #include <linux/sched.h> 14 15 #ifdef CONFIG_GENERIC_CLOCKEVENTS 16 extern void __init tick_init(void); 17 /* Should be core only, but ARM BL switcher requires it */ 18 extern void tick_suspend_local(void); 19 /* Should be core only, but XEN resume magic and ARM BL switcher require it */ 20 extern void tick_resume_local(void); 21 extern void tick_handover_do_timer(void); 22 extern void tick_cleanup_dead_cpu(int cpu); 23 #else /* CONFIG_GENERIC_CLOCKEVENTS */ 24 static inline void tick_init(void) { } 25 static inline void tick_suspend_local(void) { } 26 static inline void tick_resume_local(void) { } 27 static inline void tick_handover_do_timer(void) { } 28 static inline void tick_cleanup_dead_cpu(int cpu) { } 29 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ 30 31 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND) 32 extern void tick_freeze(void); 33 extern void tick_unfreeze(void); 34 #else 35 static inline void tick_freeze(void) { } 36 static inline void tick_unfreeze(void) { } 37 #endif 38 39 #ifdef CONFIG_TICK_ONESHOT 40 extern void tick_irq_enter(void); 41 # ifndef arch_needs_cpu 42 # define arch_needs_cpu() (0) 43 # endif 44 # else 45 static inline void tick_irq_enter(void) { } 46 #endif 47 48 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 49 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu); 50 #else 51 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { } 52 #endif 53 54 enum tick_broadcast_mode { 55 TICK_BROADCAST_OFF, 56 TICK_BROADCAST_ON, 57 TICK_BROADCAST_FORCE, 58 }; 59 60 enum tick_broadcast_state { 61 TICK_BROADCAST_EXIT, 62 TICK_BROADCAST_ENTER, 63 }; 64 65 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 66 extern void tick_broadcast_control(enum tick_broadcast_mode mode); 67 #else 68 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { } 69 #endif /* BROADCAST */ 70 71 #ifdef CONFIG_GENERIC_CLOCKEVENTS 72 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state); 73 #else 74 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) 75 { 76 return 0; 77 } 78 #endif 79 80 static inline void tick_broadcast_enable(void) 81 { 82 tick_broadcast_control(TICK_BROADCAST_ON); 83 } 84 static inline void tick_broadcast_disable(void) 85 { 86 tick_broadcast_control(TICK_BROADCAST_OFF); 87 } 88 static inline void tick_broadcast_force(void) 89 { 90 tick_broadcast_control(TICK_BROADCAST_FORCE); 91 } 92 static inline int tick_broadcast_enter(void) 93 { 94 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); 95 } 96 static inline void tick_broadcast_exit(void) 97 { 98 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); 99 } 100 101 enum tick_dep_bits { 102 TICK_DEP_BIT_POSIX_TIMER = 0, 103 TICK_DEP_BIT_PERF_EVENTS = 1, 104 TICK_DEP_BIT_SCHED = 2, 105 TICK_DEP_BIT_CLOCK_UNSTABLE = 3 106 }; 107 108 #define TICK_DEP_MASK_NONE 0 109 #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER) 110 #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS) 111 #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED) 112 #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE) 113 114 #ifdef CONFIG_NO_HZ_COMMON 115 extern bool tick_nohz_enabled; 116 extern bool tick_nohz_tick_stopped(void); 117 extern bool tick_nohz_tick_stopped_cpu(int cpu); 118 extern void tick_nohz_idle_enter(void); 119 extern void tick_nohz_idle_exit(void); 120 extern void tick_nohz_irq_exit(void); 121 extern ktime_t tick_nohz_get_sleep_length(void); 122 extern unsigned long tick_nohz_get_idle_calls(void); 123 extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu); 124 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); 125 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); 126 #else /* !CONFIG_NO_HZ_COMMON */ 127 #define tick_nohz_enabled (0) 128 static inline int tick_nohz_tick_stopped(void) { return 0; } 129 static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; } 130 static inline void tick_nohz_idle_enter(void) { } 131 static inline void tick_nohz_idle_exit(void) { } 132 133 static inline ktime_t tick_nohz_get_sleep_length(void) 134 { 135 return NSEC_PER_SEC / HZ; 136 } 137 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } 138 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } 139 #endif /* !CONFIG_NO_HZ_COMMON */ 140 141 #ifdef CONFIG_NO_HZ_FULL 142 extern bool tick_nohz_full_running; 143 extern cpumask_var_t tick_nohz_full_mask; 144 145 static inline bool tick_nohz_full_enabled(void) 146 { 147 if (!context_tracking_is_enabled()) 148 return false; 149 150 return tick_nohz_full_running; 151 } 152 153 static inline bool tick_nohz_full_cpu(int cpu) 154 { 155 if (!tick_nohz_full_enabled()) 156 return false; 157 158 return cpumask_test_cpu(cpu, tick_nohz_full_mask); 159 } 160 161 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) 162 { 163 if (tick_nohz_full_enabled()) 164 cpumask_or(mask, mask, tick_nohz_full_mask); 165 } 166 167 extern void tick_nohz_dep_set(enum tick_dep_bits bit); 168 extern void tick_nohz_dep_clear(enum tick_dep_bits bit); 169 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); 170 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); 171 extern void tick_nohz_dep_set_task(struct task_struct *tsk, 172 enum tick_dep_bits bit); 173 extern void tick_nohz_dep_clear_task(struct task_struct *tsk, 174 enum tick_dep_bits bit); 175 extern void tick_nohz_dep_set_signal(struct signal_struct *signal, 176 enum tick_dep_bits bit); 177 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, 178 enum tick_dep_bits bit); 179 180 /* 181 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases 182 * on top of static keys. 183 */ 184 static inline void tick_dep_set(enum tick_dep_bits bit) 185 { 186 if (tick_nohz_full_enabled()) 187 tick_nohz_dep_set(bit); 188 } 189 190 static inline void tick_dep_clear(enum tick_dep_bits bit) 191 { 192 if (tick_nohz_full_enabled()) 193 tick_nohz_dep_clear(bit); 194 } 195 196 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) 197 { 198 if (tick_nohz_full_cpu(cpu)) 199 tick_nohz_dep_set_cpu(cpu, bit); 200 } 201 202 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) 203 { 204 if (tick_nohz_full_cpu(cpu)) 205 tick_nohz_dep_clear_cpu(cpu, bit); 206 } 207 208 static inline void tick_dep_set_task(struct task_struct *tsk, 209 enum tick_dep_bits bit) 210 { 211 if (tick_nohz_full_enabled()) 212 tick_nohz_dep_set_task(tsk, bit); 213 } 214 static inline void tick_dep_clear_task(struct task_struct *tsk, 215 enum tick_dep_bits bit) 216 { 217 if (tick_nohz_full_enabled()) 218 tick_nohz_dep_clear_task(tsk, bit); 219 } 220 static inline void tick_dep_set_signal(struct signal_struct *signal, 221 enum tick_dep_bits bit) 222 { 223 if (tick_nohz_full_enabled()) 224 tick_nohz_dep_set_signal(signal, bit); 225 } 226 static inline void tick_dep_clear_signal(struct signal_struct *signal, 227 enum tick_dep_bits bit) 228 { 229 if (tick_nohz_full_enabled()) 230 tick_nohz_dep_clear_signal(signal, bit); 231 } 232 233 extern void tick_nohz_full_kick_cpu(int cpu); 234 extern void __tick_nohz_task_switch(void); 235 extern void __init tick_nohz_full_setup(cpumask_var_t cpumask); 236 #else 237 static inline bool tick_nohz_full_enabled(void) { return false; } 238 static inline bool tick_nohz_full_cpu(int cpu) { return false; } 239 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } 240 241 static inline void tick_dep_set(enum tick_dep_bits bit) { } 242 static inline void tick_dep_clear(enum tick_dep_bits bit) { } 243 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } 244 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } 245 static inline void tick_dep_set_task(struct task_struct *tsk, 246 enum tick_dep_bits bit) { } 247 static inline void tick_dep_clear_task(struct task_struct *tsk, 248 enum tick_dep_bits bit) { } 249 static inline void tick_dep_set_signal(struct signal_struct *signal, 250 enum tick_dep_bits bit) { } 251 static inline void tick_dep_clear_signal(struct signal_struct *signal, 252 enum tick_dep_bits bit) { } 253 254 static inline void tick_nohz_full_kick_cpu(int cpu) { } 255 static inline void __tick_nohz_task_switch(void) { } 256 static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { } 257 #endif 258 259 static inline void tick_nohz_task_switch(void) 260 { 261 if (tick_nohz_full_enabled()) 262 __tick_nohz_task_switch(); 263 } 264 265 #endif 266