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 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
72 static inline void tick_broadcast_enable(void)
74 tick_broadcast_control(TICK_BROADCAST_ON);
76 static inline void tick_broadcast_disable(void)
78 tick_broadcast_control(TICK_BROADCAST_OFF);
80 static inline void tick_broadcast_force(void)
82 tick_broadcast_control(TICK_BROADCAST_FORCE);
84 static inline int tick_broadcast_enter(void)
86 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
88 static inline void tick_broadcast_exit(void)
90 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
93 #ifdef CONFIG_NO_HZ_COMMON
94 extern int tick_nohz_tick_stopped(void);
95 extern void tick_nohz_idle_enter(void);
96 extern void tick_nohz_idle_exit(void);
97 extern void tick_nohz_irq_exit(void);
98 extern ktime_t tick_nohz_get_sleep_length(void);
99 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
100 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
101 #else /* !CONFIG_NO_HZ_COMMON */
102 static inline int tick_nohz_tick_stopped(void) { return 0; }
103 static inline void tick_nohz_idle_enter(void) { }
104 static inline void tick_nohz_idle_exit(void) { }
106 static inline ktime_t tick_nohz_get_sleep_length(void)
108 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
112 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
113 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
114 #endif /* !CONFIG_NO_HZ_COMMON */
116 #ifdef CONFIG_NO_HZ_FULL
117 extern bool tick_nohz_full_running;
118 extern cpumask_var_t tick_nohz_full_mask;
119 extern cpumask_var_t housekeeping_mask;
121 static inline bool tick_nohz_full_enabled(void)
123 if (!context_tracking_is_enabled())
126 return tick_nohz_full_running;
129 static inline bool tick_nohz_full_cpu(int cpu)
131 if (!tick_nohz_full_enabled())
134 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
137 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
139 if (tick_nohz_full_enabled())
140 cpumask_or(mask, mask, tick_nohz_full_mask);
143 extern void __tick_nohz_full_check(void);
144 extern void tick_nohz_full_kick(void);
145 extern void tick_nohz_full_kick_cpu(int cpu);
146 extern void tick_nohz_full_kick_all(void);
147 extern void __tick_nohz_task_switch(struct task_struct *tsk);
149 static inline bool tick_nohz_full_enabled(void) { return false; }
150 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
151 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
152 static inline void __tick_nohz_full_check(void) { }
153 static inline void tick_nohz_full_kick_cpu(int cpu) { }
154 static inline void tick_nohz_full_kick(void) { }
155 static inline void tick_nohz_full_kick_all(void) { }
156 static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
159 static inline bool is_housekeeping_cpu(int cpu)
161 #ifdef CONFIG_NO_HZ_FULL
162 if (tick_nohz_full_enabled())
163 return cpumask_test_cpu(cpu, housekeeping_mask);
168 static inline void housekeeping_affine(struct task_struct *t)
170 #ifdef CONFIG_NO_HZ_FULL
171 if (tick_nohz_full_enabled())
172 set_cpus_allowed_ptr(t, housekeeping_mask);
177 static inline void tick_nohz_full_check(void)
179 if (tick_nohz_full_enabled())
180 __tick_nohz_full_check();
183 static inline void tick_nohz_task_switch(struct task_struct *tsk)
185 if (tick_nohz_full_enabled())
186 __tick_nohz_task_switch(tsk);