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 enum tick_dep_bits { 101 TICK_DEP_BIT_POSIX_TIMER = 0, 102 TICK_DEP_BIT_PERF_EVENTS = 1, 103 TICK_DEP_BIT_SCHED = 2, 104 TICK_DEP_BIT_CLOCK_UNSTABLE = 3 105 }; 106 107 #define TICK_DEP_MASK_NONE 0 108 #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER) 109 #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS) 110 #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED) 111 #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE) 112 113 #ifdef CONFIG_NO_HZ_COMMON 114 extern bool tick_nohz_enabled; 115 extern int tick_nohz_tick_stopped(void); 116 extern void tick_nohz_idle_enter(void); 117 extern void tick_nohz_idle_exit(void); 118 extern void tick_nohz_irq_exit(void); 119 extern ktime_t tick_nohz_get_sleep_length(void); 120 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); 121 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); 122 #else /* !CONFIG_NO_HZ_COMMON */ 123 #define tick_nohz_enabled (0) 124 static inline int tick_nohz_tick_stopped(void) { return 0; } 125 static inline void tick_nohz_idle_enter(void) { } 126 static inline void tick_nohz_idle_exit(void) { } 127 128 static inline ktime_t tick_nohz_get_sleep_length(void) 129 { 130 return NSEC_PER_SEC / HZ; 131 } 132 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } 133 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } 134 #endif /* !CONFIG_NO_HZ_COMMON */ 135 136 #ifdef CONFIG_NO_HZ_FULL 137 extern bool tick_nohz_full_running; 138 extern cpumask_var_t tick_nohz_full_mask; 139 extern cpumask_var_t housekeeping_mask; 140 141 static inline bool tick_nohz_full_enabled(void) 142 { 143 if (!context_tracking_is_enabled()) 144 return false; 145 146 return tick_nohz_full_running; 147 } 148 149 static inline bool tick_nohz_full_cpu(int cpu) 150 { 151 if (!tick_nohz_full_enabled()) 152 return false; 153 154 return cpumask_test_cpu(cpu, tick_nohz_full_mask); 155 } 156 157 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) 158 { 159 if (tick_nohz_full_enabled()) 160 cpumask_or(mask, mask, tick_nohz_full_mask); 161 } 162 163 static inline int housekeeping_any_cpu(void) 164 { 165 return cpumask_any_and(housekeeping_mask, cpu_online_mask); 166 } 167 168 extern void tick_nohz_dep_set(enum tick_dep_bits bit); 169 extern void tick_nohz_dep_clear(enum tick_dep_bits bit); 170 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); 171 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); 172 extern void tick_nohz_dep_set_task(struct task_struct *tsk, 173 enum tick_dep_bits bit); 174 extern void tick_nohz_dep_clear_task(struct task_struct *tsk, 175 enum tick_dep_bits bit); 176 extern void tick_nohz_dep_set_signal(struct signal_struct *signal, 177 enum tick_dep_bits bit); 178 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, 179 enum tick_dep_bits bit); 180 181 /* 182 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases 183 * on top of static keys. 184 */ 185 static inline void tick_dep_set(enum tick_dep_bits bit) 186 { 187 if (tick_nohz_full_enabled()) 188 tick_nohz_dep_set(bit); 189 } 190 191 static inline void tick_dep_clear(enum tick_dep_bits bit) 192 { 193 if (tick_nohz_full_enabled()) 194 tick_nohz_dep_clear(bit); 195 } 196 197 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) 198 { 199 if (tick_nohz_full_cpu(cpu)) 200 tick_nohz_dep_set_cpu(cpu, bit); 201 } 202 203 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) 204 { 205 if (tick_nohz_full_cpu(cpu)) 206 tick_nohz_dep_clear_cpu(cpu, bit); 207 } 208 209 static inline void tick_dep_set_task(struct task_struct *tsk, 210 enum tick_dep_bits bit) 211 { 212 if (tick_nohz_full_enabled()) 213 tick_nohz_dep_set_task(tsk, bit); 214 } 215 static inline void tick_dep_clear_task(struct task_struct *tsk, 216 enum tick_dep_bits bit) 217 { 218 if (tick_nohz_full_enabled()) 219 tick_nohz_dep_clear_task(tsk, bit); 220 } 221 static inline void tick_dep_set_signal(struct signal_struct *signal, 222 enum tick_dep_bits bit) 223 { 224 if (tick_nohz_full_enabled()) 225 tick_nohz_dep_set_signal(signal, bit); 226 } 227 static inline void tick_dep_clear_signal(struct signal_struct *signal, 228 enum tick_dep_bits bit) 229 { 230 if (tick_nohz_full_enabled()) 231 tick_nohz_dep_clear_signal(signal, bit); 232 } 233 234 extern void tick_nohz_full_kick_cpu(int cpu); 235 extern void __tick_nohz_task_switch(void); 236 #else 237 static inline int housekeeping_any_cpu(void) 238 { 239 return smp_processor_id(); 240 } 241 static inline bool tick_nohz_full_enabled(void) { return false; } 242 static inline bool tick_nohz_full_cpu(int cpu) { return false; } 243 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } 244 245 static inline void tick_dep_set(enum tick_dep_bits bit) { } 246 static inline void tick_dep_clear(enum tick_dep_bits bit) { } 247 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } 248 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } 249 static inline void tick_dep_set_task(struct task_struct *tsk, 250 enum tick_dep_bits bit) { } 251 static inline void tick_dep_clear_task(struct task_struct *tsk, 252 enum tick_dep_bits bit) { } 253 static inline void tick_dep_set_signal(struct signal_struct *signal, 254 enum tick_dep_bits bit) { } 255 static inline void tick_dep_clear_signal(struct signal_struct *signal, 256 enum tick_dep_bits bit) { } 257 258 static inline void tick_nohz_full_kick_cpu(int cpu) { } 259 static inline void __tick_nohz_task_switch(void) { } 260 #endif 261 262 static inline const struct cpumask *housekeeping_cpumask(void) 263 { 264 #ifdef CONFIG_NO_HZ_FULL 265 if (tick_nohz_full_enabled()) 266 return housekeeping_mask; 267 #endif 268 return cpu_possible_mask; 269 } 270 271 static inline bool is_housekeeping_cpu(int cpu) 272 { 273 #ifdef CONFIG_NO_HZ_FULL 274 if (tick_nohz_full_enabled()) 275 return cpumask_test_cpu(cpu, housekeeping_mask); 276 #endif 277 return true; 278 } 279 280 static inline void housekeeping_affine(struct task_struct *t) 281 { 282 #ifdef CONFIG_NO_HZ_FULL 283 if (tick_nohz_full_enabled()) 284 set_cpus_allowed_ptr(t, housekeeping_mask); 285 286 #endif 287 } 288 289 static inline void tick_nohz_task_switch(void) 290 { 291 if (tick_nohz_full_enabled()) 292 __tick_nohz_task_switch(); 293 } 294 295 #endif 296