include/linux/tick.h

   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_stop_tick(void);
 119 extern void tick_nohz_idle_retain_tick(void);
 120 extern void tick_nohz_idle_restart_tick(void);
 121 extern void tick_nohz_idle_enter(void);
 122 extern void tick_nohz_idle_exit(void);
 123 extern void tick_nohz_irq_exit(void);
 124 extern bool tick_nohz_idle_got_tick(void);
 125 extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
 126 extern unsigned long tick_nohz_get_idle_calls(void);
 127 extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
 128 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
 129 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
 130
 131 static inline void tick_nohz_idle_stop_tick_protected(void)
 132 {
 133         local_irq_disable();
 134         tick_nohz_idle_stop_tick();
 135         local_irq_enable();
 136 }
 137
 138 #else /* !CONFIG_NO_HZ_COMMON */
 139 #define tick_nohz_enabled (0)
 140 static inline int tick_nohz_tick_stopped(void) { return 0; }
 141 static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
 142 static inline void tick_nohz_idle_stop_tick(void) { }
 143 static inline void tick_nohz_idle_retain_tick(void) { }
 144 static inline void tick_nohz_idle_restart_tick(void) { }
 145 static inline void tick_nohz_idle_enter(void) { }
 146 static inline void tick_nohz_idle_exit(void) { }
 147 static inline bool tick_nohz_idle_got_tick(void) { return false; }
 148
 149 static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
 150 {
 151         *delta_next = TICK_NSEC;
 152         return *delta_next;
 153 }
 154 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
 155 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
 156
 157 static inline void tick_nohz_idle_stop_tick_protected(void) { }
 158 #endif /* !CONFIG_NO_HZ_COMMON */
 159
 160 #ifdef CONFIG_NO_HZ_FULL
 161 extern bool tick_nohz_full_running;
 162 extern cpumask_var_t tick_nohz_full_mask;
 163
 164 static inline bool tick_nohz_full_enabled(void)
 165 {
 166         if (!context_tracking_is_enabled())
 167                 return false;
 168
 169         return tick_nohz_full_running;
 170 }
 171
 172 static inline bool tick_nohz_full_cpu(int cpu)
 173 {
 174         if (!tick_nohz_full_enabled())
 175                 return false;
 176
 177         return cpumask_test_cpu(cpu, tick_nohz_full_mask);
 178 }
 179
 180 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
 181 {
 182         if (tick_nohz_full_enabled())
 183                 cpumask_or(mask, mask, tick_nohz_full_mask);
 184 }
 185
 186 extern void tick_nohz_dep_set(enum tick_dep_bits bit);
 187 extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
 188 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
 189 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
 190 extern void tick_nohz_dep_set_task(struct task_struct *tsk,
 191                                    enum tick_dep_bits bit);
 192 extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
 193                                      enum tick_dep_bits bit);
 194 extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
 195                                      enum tick_dep_bits bit);
 196 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
 197                                        enum tick_dep_bits bit);
 198
 199 /*
 200  * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
 201  * on top of static keys.
 202  */
 203 static inline void tick_dep_set(enum tick_dep_bits bit)
 204 {
 205         if (tick_nohz_full_enabled())
 206                 tick_nohz_dep_set(bit);
 207 }
 208
 209 static inline void tick_dep_clear(enum tick_dep_bits bit)
 210 {
 211         if (tick_nohz_full_enabled())
 212                 tick_nohz_dep_clear(bit);
 213 }
 214
 215 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
 216 {
 217         if (tick_nohz_full_cpu(cpu))
 218                 tick_nohz_dep_set_cpu(cpu, bit);
 219 }
 220
 221 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
 222 {
 223         if (tick_nohz_full_cpu(cpu))
 224                 tick_nohz_dep_clear_cpu(cpu, bit);
 225 }
 226
 227 static inline void tick_dep_set_task(struct task_struct *tsk,
 228                                      enum tick_dep_bits bit)
 229 {
 230         if (tick_nohz_full_enabled())
 231                 tick_nohz_dep_set_task(tsk, bit);
 232 }
 233 static inline void tick_dep_clear_task(struct task_struct *tsk,
 234                                        enum tick_dep_bits bit)
 235 {
 236         if (tick_nohz_full_enabled())
 237                 tick_nohz_dep_clear_task(tsk, bit);
 238 }
 239 static inline void tick_dep_set_signal(struct signal_struct *signal,
 240                                        enum tick_dep_bits bit)
 241 {
 242         if (tick_nohz_full_enabled())
 243                 tick_nohz_dep_set_signal(signal, bit);
 244 }
 245 static inline void tick_dep_clear_signal(struct signal_struct *signal,
 246                                          enum tick_dep_bits bit)
 247 {
 248         if (tick_nohz_full_enabled())
 249                 tick_nohz_dep_clear_signal(signal, bit);
 250 }
 251
 252 extern void tick_nohz_full_kick_cpu(int cpu);
 253 extern void __tick_nohz_task_switch(void);
 254 extern void __init tick_nohz_full_setup(cpumask_var_t cpumask);
 255 #else
 256 static inline bool tick_nohz_full_enabled(void) { return false; }
 257 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
 258 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
 259
 260 static inline void tick_dep_set(enum tick_dep_bits bit) { }
 261 static inline void tick_dep_clear(enum tick_dep_bits bit) { }
 262 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
 263 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
 264 static inline void tick_dep_set_task(struct task_struct *tsk,
 265                                      enum tick_dep_bits bit) { }
 266 static inline void tick_dep_clear_task(struct task_struct *tsk,
 267                                        enum tick_dep_bits bit) { }
 268 static inline void tick_dep_set_signal(struct signal_struct *signal,
 269                                        enum tick_dep_bits bit) { }
 270 static inline void tick_dep_clear_signal(struct signal_struct *signal,
 271                                          enum tick_dep_bits bit) { }
 272
 273 static inline void tick_nohz_full_kick_cpu(int cpu) { }
 274 static inline void __tick_nohz_task_switch(void) { }
 275 static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
 276 #endif
 277
 278 static inline void tick_nohz_task_switch(void)
 279 {
 280         if (tick_nohz_full_enabled())
 281                 __tick_nohz_task_switch();
 282 }
 283
 284 #endif