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 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
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
) { return 0; }
76 static inline void tick_broadcast_enable(void)
78 tick_broadcast_control(TICK_BROADCAST_ON
);
80 static inline void tick_broadcast_disable(void)
82 tick_broadcast_control(TICK_BROADCAST_OFF
);
84 static inline void tick_broadcast_force(void)
86 tick_broadcast_control(TICK_BROADCAST_FORCE
);
88 static inline int tick_broadcast_enter(void)
90 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER
);
92 static inline void tick_broadcast_exit(void)
94 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT
);
97 #ifdef CONFIG_NO_HZ_COMMON
98 extern int tick_nohz_tick_stopped(void);
99 extern void tick_nohz_idle_enter(void);
100 extern void tick_nohz_idle_exit(void);
101 extern void tick_nohz_irq_exit(void);
102 extern ktime_t
tick_nohz_get_sleep_length(void);
103 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
104 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
105 #else /* !CONFIG_NO_HZ_COMMON */
106 static inline int tick_nohz_tick_stopped(void) { return 0; }
107 static inline void tick_nohz_idle_enter(void) { }
108 static inline void tick_nohz_idle_exit(void) { }
110 static inline ktime_t
tick_nohz_get_sleep_length(void)
112 ktime_t len
= { .tv64
= NSEC_PER_SEC
/HZ
};
116 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
117 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
118 #endif /* !CONFIG_NO_HZ_COMMON */
120 #ifdef CONFIG_NO_HZ_FULL
121 extern bool tick_nohz_full_running
;
122 extern cpumask_var_t tick_nohz_full_mask
;
123 extern cpumask_var_t housekeeping_mask
;
125 static inline bool tick_nohz_full_enabled(void)
127 if (!context_tracking_is_enabled())
130 return tick_nohz_full_running
;
133 static inline bool tick_nohz_full_cpu(int cpu
)
135 if (!tick_nohz_full_enabled())
138 return cpumask_test_cpu(cpu
, tick_nohz_full_mask
);
141 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
)
143 if (tick_nohz_full_enabled())
144 cpumask_or(mask
, mask
, tick_nohz_full_mask
);
147 extern void __tick_nohz_full_check(void);
148 extern void tick_nohz_full_kick(void);
149 extern void tick_nohz_full_kick_cpu(int cpu
);
150 extern void tick_nohz_full_kick_all(void);
151 extern void __tick_nohz_task_switch(struct task_struct
*tsk
);
153 static inline bool tick_nohz_full_enabled(void) { return false; }
154 static inline bool tick_nohz_full_cpu(int cpu
) { return false; }
155 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
) { }
156 static inline void __tick_nohz_full_check(void) { }
157 static inline void tick_nohz_full_kick_cpu(int cpu
) { }
158 static inline void tick_nohz_full_kick(void) { }
159 static inline void tick_nohz_full_kick_all(void) { }
160 static inline void __tick_nohz_task_switch(struct task_struct
*tsk
) { }
163 static inline bool is_housekeeping_cpu(int cpu
)
165 #ifdef CONFIG_NO_HZ_FULL
166 if (tick_nohz_full_enabled())
167 return cpumask_test_cpu(cpu
, housekeeping_mask
);
172 static inline void housekeeping_affine(struct task_struct
*t
)
174 #ifdef CONFIG_NO_HZ_FULL
175 if (tick_nohz_full_enabled())
176 set_cpus_allowed_ptr(t
, housekeeping_mask
);
181 static inline void tick_nohz_full_check(void)
183 if (tick_nohz_full_enabled())
184 __tick_nohz_full_check();
187 static inline void tick_nohz_task_switch(struct task_struct
*tsk
)
189 if (tick_nohz_full_enabled())
190 __tick_nohz_task_switch(tsk
);