2 * Tick related global functions
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>
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 */
30 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
31 extern void tick_freeze(void);
32 extern void tick_unfreeze(void);
34 static inline void tick_freeze(void) { }
35 static inline void tick_unfreeze(void) { }
38 #ifdef CONFIG_TICK_ONESHOT
39 extern void tick_irq_enter(void);
40 # ifndef arch_needs_cpu
41 # define arch_needs_cpu() (0)
44 static inline void tick_irq_enter(void) { }
47 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
48 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
50 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
53 enum tick_broadcast_mode {
59 enum tick_broadcast_state {
64 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
65 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
67 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
68 #endif /* BROADCAST */
70 #ifdef CONFIG_GENERIC_CLOCKEVENTS
71 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
73 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
79 static inline void tick_broadcast_enable(void)
81 tick_broadcast_control(TICK_BROADCAST_ON);
83 static inline void tick_broadcast_disable(void)
85 tick_broadcast_control(TICK_BROADCAST_OFF);
87 static inline void tick_broadcast_force(void)
89 tick_broadcast_control(TICK_BROADCAST_FORCE);
91 static inline int tick_broadcast_enter(void)
93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
95 static inline void tick_broadcast_exit(void)
97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
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
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)
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) { }
128 static inline ktime_t tick_nohz_get_sleep_length(void)
130 return NSEC_PER_SEC / HZ;
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 */
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;
141 static inline bool tick_nohz_full_enabled(void)
143 if (!context_tracking_is_enabled())
146 return tick_nohz_full_running;
149 static inline bool tick_nohz_full_cpu(int cpu)
151 if (!tick_nohz_full_enabled())
154 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
157 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
159 if (tick_nohz_full_enabled())
160 cpumask_or(mask, mask, tick_nohz_full_mask);
163 static inline int housekeeping_any_cpu(void)
165 return cpumask_any_and(housekeeping_mask, cpu_online_mask);
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);
182 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
183 * on top of static keys.
185 static inline void tick_dep_set(enum tick_dep_bits bit)
187 if (tick_nohz_full_enabled())
188 tick_nohz_dep_set(bit);
191 static inline void tick_dep_clear(enum tick_dep_bits bit)
193 if (tick_nohz_full_enabled())
194 tick_nohz_dep_clear(bit);
197 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
199 if (tick_nohz_full_cpu(cpu))
200 tick_nohz_dep_set_cpu(cpu, bit);
203 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
205 if (tick_nohz_full_cpu(cpu))
206 tick_nohz_dep_clear_cpu(cpu, bit);
209 static inline void tick_dep_set_task(struct task_struct *tsk,
210 enum tick_dep_bits bit)
212 if (tick_nohz_full_enabled())
213 tick_nohz_dep_set_task(tsk, bit);
215 static inline void tick_dep_clear_task(struct task_struct *tsk,
216 enum tick_dep_bits bit)
218 if (tick_nohz_full_enabled())
219 tick_nohz_dep_clear_task(tsk, bit);
221 static inline void tick_dep_set_signal(struct signal_struct *signal,
222 enum tick_dep_bits bit)
224 if (tick_nohz_full_enabled())
225 tick_nohz_dep_set_signal(signal, bit);
227 static inline void tick_dep_clear_signal(struct signal_struct *signal,
228 enum tick_dep_bits bit)
230 if (tick_nohz_full_enabled())
231 tick_nohz_dep_clear_signal(signal, bit);
234 extern void tick_nohz_full_kick_cpu(int cpu);
235 extern void __tick_nohz_task_switch(void);
237 static inline int housekeeping_any_cpu(void)
239 return smp_processor_id();
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) { }
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) { }
258 static inline void tick_nohz_full_kick_cpu(int cpu) { }
259 static inline void __tick_nohz_task_switch(void) { }
262 static inline const struct cpumask *housekeeping_cpumask(void)
264 #ifdef CONFIG_NO_HZ_FULL
265 if (tick_nohz_full_enabled())
266 return housekeeping_mask;
268 return cpu_possible_mask;
271 static inline bool is_housekeeping_cpu(int cpu)
273 #ifdef CONFIG_NO_HZ_FULL
274 if (tick_nohz_full_enabled())
275 return cpumask_test_cpu(cpu, housekeeping_mask);
280 static inline void housekeeping_affine(struct task_struct *t)
282 #ifdef CONFIG_NO_HZ_FULL
283 if (tick_nohz_full_enabled())
284 set_cpus_allowed_ptr(t, housekeeping_mask);
289 static inline void tick_nohz_task_switch(void)
291 if (tick_nohz_full_enabled())
292 __tick_nohz_task_switch();