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 * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped) 42 * @timer_expires_base: Base time clock monotonic for @timer_expires 43 * @do_timer_lst: CPU was the last one doing do_timer before going idle 44 */ 45 struct tick_sched { 46 struct hrtimer sched_timer; 47 unsigned long check_clocks; 48 enum tick_nohz_mode nohz_mode; 49 ktime_t last_tick; 50 ktime_t next_tick; 51 int inidle; 52 int tick_stopped; 53 unsigned long idle_jiffies; 54 unsigned long idle_calls; 55 unsigned long idle_sleeps; 56 int idle_active; 57 ktime_t idle_entrytime; 58 ktime_t idle_waketime; 59 ktime_t idle_exittime; 60 ktime_t idle_sleeptime; 61 ktime_t iowait_sleeptime; 62 unsigned long last_jiffies; 63 u64 timer_expires; 64 u64 timer_expires_base; 65 u64 next_timer; 66 ktime_t idle_expires; 67 int do_timer_last; 68 atomic_t tick_dep_mask; 69 }; 70 71 extern struct tick_sched *tick_get_tick_sched(int cpu); 72 73 extern void tick_setup_sched_timer(void); 74 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 75 extern void tick_cancel_sched_timer(int cpu); 76 #else tick_cancel_sched_timer(int cpu)77static inline void tick_cancel_sched_timer(int cpu) { } 78 #endif 79 80 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 81 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 82 #else 83 static inline int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)84__tick_broadcast_oneshot_control(enum tick_broadcast_state state) 85 { 86 return -EBUSY; 87 } 88 #endif 89 90 #endif 91