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 * @tick_stopped: Indicator that the idle tick has been stopped 31 * @idle_jiffies: jiffies at the entry to idle for idle time accounting 32 * @idle_calls: Total number of idle calls 33 * @idle_sleeps: Number of idle calls, where the sched tick was stopped 34 * @idle_entrytime: Time when the idle call was entered 35 * @idle_waketime: Time when the idle was interrupted 36 * @idle_exittime: Time when the idle state was left 37 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped 38 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding 39 * @sleep_length: Duration of the current idle sleep 40 * @do_timer_lst: CPU was the last one doing do_timer before going idle 41 */ 42 struct tick_sched { 43 struct hrtimer sched_timer; 44 unsigned long check_clocks; 45 enum tick_nohz_mode nohz_mode; 46 ktime_t last_tick; 47 int inidle; 48 int tick_stopped; 49 unsigned long idle_jiffies; 50 unsigned long idle_calls; 51 unsigned long idle_sleeps; 52 int idle_active; 53 ktime_t idle_entrytime; 54 ktime_t idle_waketime; 55 ktime_t idle_exittime; 56 ktime_t idle_sleeptime; 57 ktime_t iowait_sleeptime; 58 ktime_t sleep_length; 59 unsigned long last_jiffies; 60 u64 next_timer; 61 ktime_t idle_expires; 62 int do_timer_last; 63 atomic_t tick_dep_mask; 64 }; 65 66 extern struct tick_sched *tick_get_tick_sched(int cpu); 67 68 extern void tick_setup_sched_timer(void); 69 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 70 extern void tick_cancel_sched_timer(int cpu); 71 #else 72 static inline void tick_cancel_sched_timer(int cpu) { } 73 #endif 74 75 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 76 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 77 #else 78 static inline int 79 __tick_broadcast_oneshot_control(enum tick_broadcast_state state) 80 { 81 return -EBUSY; 82 } 83 #endif 84 85 #endif 86