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
);
100 #ifdef CONFIG_NO_HZ_COMMON
101 extern int tick_nohz_enabled
;
102 extern int tick_nohz_tick_stopped(void);
103 extern void tick_nohz_idle_enter(void);
104 extern void tick_nohz_idle_exit(void);
105 extern void tick_nohz_irq_exit(void);
106 extern ktime_t
tick_nohz_get_sleep_length(void);
107 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
108 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
109 #else /* !CONFIG_NO_HZ_COMMON */
110 #define tick_nohz_enabled (0)
111 static inline int tick_nohz_tick_stopped(void) { return 0; }
112 static inline void tick_nohz_idle_enter(void) { }
113 static inline void tick_nohz_idle_exit(void) { }
115 static inline ktime_t
tick_nohz_get_sleep_length(void)
117 ktime_t len
= { .tv64
= NSEC_PER_SEC
/HZ
};
121 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
122 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
123 #endif /* !CONFIG_NO_HZ_COMMON */
125 #ifdef CONFIG_NO_HZ_FULL
126 extern bool tick_nohz_full_running
;
127 extern cpumask_var_t tick_nohz_full_mask
;
128 extern cpumask_var_t housekeeping_mask
;
130 static inline bool tick_nohz_full_enabled(void)
132 if (!context_tracking_is_enabled())
135 return tick_nohz_full_running
;
138 static inline bool tick_nohz_full_cpu(int cpu
)
140 if (!tick_nohz_full_enabled())
143 return cpumask_test_cpu(cpu
, tick_nohz_full_mask
);
146 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
)
148 if (tick_nohz_full_enabled())
149 cpumask_or(mask
, mask
, tick_nohz_full_mask
);
152 static inline int housekeeping_any_cpu(void)
154 return cpumask_any_and(housekeeping_mask
, cpu_online_mask
);
157 extern void tick_nohz_full_kick(void);
158 extern void tick_nohz_full_kick_cpu(int cpu
);
159 extern void tick_nohz_full_kick_all(void);
160 extern void __tick_nohz_task_switch(void);
162 static inline int housekeeping_any_cpu(void)
164 return smp_processor_id();
166 static inline bool tick_nohz_full_enabled(void) { return false; }
167 static inline bool tick_nohz_full_cpu(int cpu
) { return false; }
168 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
) { }
169 static inline void tick_nohz_full_kick_cpu(int cpu
) { }
170 static inline void tick_nohz_full_kick(void) { }
171 static inline void tick_nohz_full_kick_all(void) { }
172 static inline void __tick_nohz_task_switch(void) { }
175 static inline const struct cpumask
*housekeeping_cpumask(void)
177 #ifdef CONFIG_NO_HZ_FULL
178 if (tick_nohz_full_enabled())
179 return housekeeping_mask
;
181 return cpu_possible_mask
;
184 static inline bool is_housekeeping_cpu(int cpu
)
186 #ifdef CONFIG_NO_HZ_FULL
187 if (tick_nohz_full_enabled())
188 return cpumask_test_cpu(cpu
, housekeeping_mask
);
193 static inline void housekeeping_affine(struct task_struct
*t
)
195 #ifdef CONFIG_NO_HZ_FULL
196 if (tick_nohz_full_enabled())
197 set_cpus_allowed_ptr(t
, housekeeping_mask
);
202 static inline void tick_nohz_task_switch(void)
204 if (tick_nohz_full_enabled())
205 __tick_nohz_task_switch();