1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _TICK_SCHED_H 3 #define _TICK_SCHED_H 4 5 #include <linux/hrtimer.h> 6 7 enum tick_device_mode { 8 TICKDEV_MODE_PERIODIC, 9 TICKDEV_MODE_ONESHOT, 10 }; 11 12 struct tick_device { 13 struct clock_event_device *evtdev; 14 enum tick_device_mode mode; 15 }; 16 17 enum tick_nohz_mode { 18 NOHZ_MODE_INACTIVE, 19 NOHZ_MODE_LOWRES, 20 NOHZ_MODE_HIGHRES, 21 }; 22 23 /** 24 * struct tick_sched - sched tick emulation and no idle tick control/stats 25 * @sched_timer: hrtimer to schedule the periodic tick in high 26 * resolution mode 27 * @last_tick: Store the last tick expiry time when the tick 28 * timer is modified for nohz sleeps. This is necessary 29 * to resume the tick timer operation in the timeline 30 * when the CPU returns from nohz sleep. 31 * @next_tick: Next tick to be fired when in dynticks mode. 32 * @tick_stopped: Indicator that the idle tick has been stopped 33 * @idle_jiffies: jiffies at the entry to idle for idle time accounting 34 * @idle_calls: Total number of idle calls 35 * @idle_sleeps: Number of idle calls, where the sched tick was stopped 36 * @idle_entrytime: Time when the idle call was entered 37 * @idle_waketime: Time when the idle was interrupted 38 * @idle_exittime: Time when the idle state was left 39 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped 40 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding 41 * @sleep_length: Duration of the current idle sleep 42 * @do_timer_lst: CPU was the last one doing do_timer before going idle 43 */ 44 struct tick_sched { 45 struct hrtimer sched_timer; 46 unsigned long check_clocks; 47 enum tick_nohz_mode nohz_mode; 48 ktime_t last_tick; 49 ktime_t next_tick; 50 int inidle; 51 int tick_stopped; 52 unsigned long idle_jiffies; 53 unsigned long idle_calls; 54 unsigned long idle_sleeps; 55 int idle_active; 56 ktime_t idle_entrytime; 57 ktime_t idle_waketime; 58 ktime_t idle_exittime; 59 ktime_t idle_sleeptime; 60 ktime_t iowait_sleeptime; 61 ktime_t sleep_length; 62 unsigned long last_jiffies; 63 u64 next_timer; 64 ktime_t idle_expires; 65 int do_timer_last; 66 atomic_t tick_dep_mask; 67 }; 68 69 extern struct tick_sched *tick_get_tick_sched(int cpu); 70 71 extern void tick_setup_sched_timer(void); 72 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 73 extern void tick_cancel_sched_timer(int cpu); 74 #else 75 static inline void tick_cancel_sched_timer(int cpu) { } 76 #endif 77 78 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 79 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 80 #else 81 static inline int 82 __tick_broadcast_oneshot_control(enum tick_broadcast_state state) 83 { 84 return -EBUSY; 85 } 86 #endif 87 88 #endif 89