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 extern void tick_freeze(void);
17 extern void tick_unfreeze(void);
18 /* Should be core only, but ARM BL switcher requires it */
19 extern void tick_suspend_local(void);
20 /* Should be core only, but XEN resume magic and ARM BL switcher require it */
21 extern void tick_resume_local(void);
22 #else /* CONFIG_GENERIC_CLOCKEVENTS */
23 static inline void tick_init(void) { }
24 static inline void tick_freeze(void) { }
25 static inline void tick_unfreeze(void) { }
26 static inline void tick_suspend_local(void) { }
27 static inline void tick_resume_local(void) { }
28 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
30 #ifdef CONFIG_TICK_ONESHOT
31 extern void tick_irq_enter(void);
32 # ifndef arch_needs_cpu
33 # define arch_needs_cpu() (0)
36 static inline void tick_irq_enter(void) { }
39 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
40 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
42 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
45 enum tick_broadcast_mode {
51 enum tick_broadcast_state {
56 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
57 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
59 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
60 #endif /* BROADCAST */
62 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
63 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
65 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) { return 0; }
68 static inline void tick_broadcast_enable(void)
70 tick_broadcast_control(TICK_BROADCAST_ON);
72 static inline void tick_broadcast_disable(void)
74 tick_broadcast_control(TICK_BROADCAST_OFF);
76 static inline void tick_broadcast_force(void)
78 tick_broadcast_control(TICK_BROADCAST_FORCE);
80 static inline int tick_broadcast_enter(void)
82 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
84 static inline void tick_broadcast_exit(void)
86 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
89 #ifdef CONFIG_NO_HZ_COMMON
90 extern int tick_nohz_tick_stopped(void);
91 extern void tick_nohz_idle_enter(void);
92 extern void tick_nohz_idle_exit(void);
93 extern void tick_nohz_irq_exit(void);
94 extern ktime_t tick_nohz_get_sleep_length(void);
95 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
96 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
97 #else /* !CONFIG_NO_HZ_COMMON */
98 static inline int tick_nohz_tick_stopped(void) { return 0; }
99 static inline void tick_nohz_idle_enter(void) { }
100 static inline void tick_nohz_idle_exit(void) { }
102 static inline ktime_t tick_nohz_get_sleep_length(void)
104 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
108 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
109 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
110 #endif /* !CONFIG_NO_HZ_COMMON */
112 #ifdef CONFIG_NO_HZ_FULL
113 extern bool tick_nohz_full_running;
114 extern cpumask_var_t tick_nohz_full_mask;
115 extern cpumask_var_t housekeeping_mask;
117 static inline bool tick_nohz_full_enabled(void)
119 if (!context_tracking_is_enabled())
122 return tick_nohz_full_running;
125 static inline bool tick_nohz_full_cpu(int cpu)
127 if (!tick_nohz_full_enabled())
130 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
133 extern void __tick_nohz_full_check(void);
134 extern void tick_nohz_full_kick(void);
135 extern void tick_nohz_full_kick_cpu(int cpu);
136 extern void tick_nohz_full_kick_all(void);
137 extern void __tick_nohz_task_switch(struct task_struct *tsk);
139 static inline bool tick_nohz_full_enabled(void) { return false; }
140 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
141 static inline void __tick_nohz_full_check(void) { }
142 static inline void tick_nohz_full_kick_cpu(int cpu) { }
143 static inline void tick_nohz_full_kick(void) { }
144 static inline void tick_nohz_full_kick_all(void) { }
145 static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
148 static inline bool is_housekeeping_cpu(int cpu)
150 #ifdef CONFIG_NO_HZ_FULL
151 if (tick_nohz_full_enabled())
152 return cpumask_test_cpu(cpu, housekeeping_mask);
157 static inline void housekeeping_affine(struct task_struct *t)
159 #ifdef CONFIG_NO_HZ_FULL
160 if (tick_nohz_full_enabled())
161 set_cpus_allowed_ptr(t, housekeeping_mask);
166 static inline void tick_nohz_full_check(void)
168 if (tick_nohz_full_enabled())
169 __tick_nohz_full_check();
172 static inline void tick_nohz_task_switch(struct task_struct *tsk)
174 if (tick_nohz_full_enabled())
175 __tick_nohz_task_switch(tsk);