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 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; 131 132 return len; 133 } 134 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } 135 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } 136 #endif /* !CONFIG_NO_HZ_COMMON */ 137 138 #ifdef CONFIG_NO_HZ_FULL 139 extern bool tick_nohz_full_running; 140 extern cpumask_var_t tick_nohz_full_mask; 141 extern cpumask_var_t housekeeping_mask; 142 143 static inline bool tick_nohz_full_enabled(void) 144 { 145 if (!context_tracking_is_enabled()) 146 return false; 147 148 return tick_nohz_full_running; 149 } 150 151 static inline bool tick_nohz_full_cpu(int cpu) 152 { 153 if (!tick_nohz_full_enabled()) 154 return false; 155 156 return cpumask_test_cpu(cpu, tick_nohz_full_mask); 157 } 158 159 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) 160 { 161 if (tick_nohz_full_enabled()) 162 cpumask_or(mask, mask, tick_nohz_full_mask); 163 } 164 165 static inline int housekeeping_any_cpu(void) 166 { 167 return cpumask_any_and(housekeeping_mask, cpu_online_mask); 168 } 169 170 extern void tick_nohz_dep_set(enum tick_dep_bits bit); 171 extern void tick_nohz_dep_clear(enum tick_dep_bits bit); 172 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); 173 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); 174 extern void tick_nohz_dep_set_task(struct task_struct *tsk, 175 enum tick_dep_bits bit); 176 extern void tick_nohz_dep_clear_task(struct task_struct *tsk, 177 enum tick_dep_bits bit); 178 extern void tick_nohz_dep_set_signal(struct signal_struct *signal, 179 enum tick_dep_bits bit); 180 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, 181 enum tick_dep_bits bit); 182 183 /* 184 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases 185 * on top of static keys. 186 */ 187 static inline void tick_dep_set(enum tick_dep_bits bit) 188 { 189 if (tick_nohz_full_enabled()) 190 tick_nohz_dep_set(bit); 191 } 192 193 static inline void tick_dep_clear(enum tick_dep_bits bit) 194 { 195 if (tick_nohz_full_enabled()) 196 tick_nohz_dep_clear(bit); 197 } 198 199 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) 200 { 201 if (tick_nohz_full_cpu(cpu)) 202 tick_nohz_dep_set_cpu(cpu, bit); 203 } 204 205 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) 206 { 207 if (tick_nohz_full_cpu(cpu)) 208 tick_nohz_dep_clear_cpu(cpu, bit); 209 } 210 211 static inline void tick_dep_set_task(struct task_struct *tsk, 212 enum tick_dep_bits bit) 213 { 214 if (tick_nohz_full_enabled()) 215 tick_nohz_dep_set_task(tsk, bit); 216 } 217 static inline void tick_dep_clear_task(struct task_struct *tsk, 218 enum tick_dep_bits bit) 219 { 220 if (tick_nohz_full_enabled()) 221 tick_nohz_dep_clear_task(tsk, bit); 222 } 223 static inline void tick_dep_set_signal(struct signal_struct *signal, 224 enum tick_dep_bits bit) 225 { 226 if (tick_nohz_full_enabled()) 227 tick_nohz_dep_set_signal(signal, bit); 228 } 229 static inline void tick_dep_clear_signal(struct signal_struct *signal, 230 enum tick_dep_bits bit) 231 { 232 if (tick_nohz_full_enabled()) 233 tick_nohz_dep_clear_signal(signal, bit); 234 } 235 236 extern void tick_nohz_full_kick_cpu(int cpu); 237 extern void __tick_nohz_task_switch(void); 238 #else 239 static inline int housekeeping_any_cpu(void) 240 { 241 return smp_processor_id(); 242 } 243 static inline bool tick_nohz_full_enabled(void) { return false; } 244 static inline bool tick_nohz_full_cpu(int cpu) { return false; } 245 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } 246 247 static inline void tick_dep_set(enum tick_dep_bits bit) { } 248 static inline void tick_dep_clear(enum tick_dep_bits bit) { } 249 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } 250 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } 251 static inline void tick_dep_set_task(struct task_struct *tsk, 252 enum tick_dep_bits bit) { } 253 static inline void tick_dep_clear_task(struct task_struct *tsk, 254 enum tick_dep_bits bit) { } 255 static inline void tick_dep_set_signal(struct signal_struct *signal, 256 enum tick_dep_bits bit) { } 257 static inline void tick_dep_clear_signal(struct signal_struct *signal, 258 enum tick_dep_bits bit) { } 259 260 static inline void tick_nohz_full_kick_cpu(int cpu) { } 261 static inline void __tick_nohz_task_switch(void) { } 262 #endif 263 264 static inline const struct cpumask *housekeeping_cpumask(void) 265 { 266 #ifdef CONFIG_NO_HZ_FULL 267 if (tick_nohz_full_enabled()) 268 return housekeeping_mask; 269 #endif 270 return cpu_possible_mask; 271 } 272 273 static inline bool is_housekeeping_cpu(int cpu) 274 { 275 #ifdef CONFIG_NO_HZ_FULL 276 if (tick_nohz_full_enabled()) 277 return cpumask_test_cpu(cpu, housekeeping_mask); 278 #endif 279 return true; 280 } 281 282 static inline void housekeeping_affine(struct task_struct *t) 283 { 284 #ifdef CONFIG_NO_HZ_FULL 285 if (tick_nohz_full_enabled()) 286 set_cpus_allowed_ptr(t, housekeeping_mask); 287 288 #endif 289 } 290 291 static inline void tick_nohz_task_switch(void) 292 { 293 if (tick_nohz_full_enabled()) 294 __tick_nohz_task_switch(); 295 } 296 297 #endif 298