1 #ifndef _TICK_SCHED_H 2 #define _TICK_SCHED_H 3 4 #include <linux/hrtimer.h> 5 6 enum tick_device_mode { 7 TICKDEV_MODE_PERIODIC, 8 TICKDEV_MODE_ONESHOT, 9 }; 10 11 struct tick_device { 12 struct clock_event_device *evtdev; 13 enum tick_device_mode mode; 14 }; 15 16 enum tick_nohz_mode { 17 NOHZ_MODE_INACTIVE, 18 NOHZ_MODE_LOWRES, 19 NOHZ_MODE_HIGHRES, 20 }; 21 22 /** 23 * struct tick_sched - sched tick emulation and no idle tick control/stats 24 * @sched_timer: hrtimer to schedule the periodic tick in high 25 * resolution mode 26 * @last_tick: Store the last tick expiry time when the tick 27 * timer is modified for nohz sleeps. This is necessary 28 * to resume the tick timer operation in the timeline 29 * when the CPU returns from nohz sleep. 30 * @next_tick: Next tick to be fired when in dynticks mode. 31 * @tick_stopped: Indicator that the idle tick has been stopped 32 * @idle_jiffies: jiffies at the entry to idle for idle time accounting 33 * @idle_calls: Total number of idle calls 34 * @idle_sleeps: Number of idle calls, where the sched tick was stopped 35 * @idle_entrytime: Time when the idle call was entered 36 * @idle_waketime: Time when the idle was interrupted 37 * @idle_exittime: Time when the idle state was left 38 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped 39 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding 40 * @sleep_length: Duration of the current idle sleep 41 * @do_timer_lst: CPU was the last one doing do_timer before going idle 42 */ 43 struct tick_sched { 44 struct hrtimer sched_timer; 45 unsigned long check_clocks; 46 enum tick_nohz_mode nohz_mode; 47 ktime_t last_tick; 48 ktime_t next_tick; 49 int inidle; 50 int tick_stopped; 51 unsigned long idle_jiffies; 52 unsigned long idle_calls; 53 unsigned long idle_sleeps; 54 int idle_active; 55 ktime_t idle_entrytime; 56 ktime_t idle_waketime; 57 ktime_t idle_exittime; 58 ktime_t idle_sleeptime; 59 ktime_t iowait_sleeptime; 60 ktime_t sleep_length; 61 unsigned long last_jiffies; 62 u64 next_timer; 63 ktime_t idle_expires; 64 int do_timer_last; 65 atomic_t tick_dep_mask; 66 }; 67 68 extern struct tick_sched *tick_get_tick_sched(int cpu); 69 70 extern void tick_setup_sched_timer(void); 71 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 72 extern void tick_cancel_sched_timer(int cpu); 73 #else 74 static inline void tick_cancel_sched_timer(int cpu) { } 75 #endif 76 77 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 78 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 79 #else 80 static inline int 81 __tick_broadcast_oneshot_control(enum tick_broadcast_state state) 82 { 83 return -EBUSY; 84 } 85 #endif 86 87 #endif 88