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 * @got_idle_tick: Tick timer function has run with @inidle set 45 */ 46 struct tick_sched { 47 struct hrtimer sched_timer; 48 unsigned long check_clocks; 49 enum tick_nohz_mode nohz_mode; 50 51 unsigned int inidle : 1; 52 unsigned int tick_stopped : 1; 53 unsigned int idle_active : 1; 54 unsigned int do_timer_last : 1; 55 unsigned int got_idle_tick : 1; 56 57 ktime_t last_tick; 58 ktime_t next_tick; 59 unsigned long idle_jiffies; 60 unsigned long idle_calls; 61 unsigned long idle_sleeps; 62 ktime_t idle_entrytime; 63 ktime_t idle_waketime; 64 ktime_t idle_exittime; 65 ktime_t idle_sleeptime; 66 ktime_t iowait_sleeptime; 67 unsigned long last_jiffies; 68 u64 timer_expires; 69 u64 timer_expires_base; 70 u64 next_timer; 71 ktime_t idle_expires; 72 atomic_t tick_dep_mask; 73 }; 74 75 extern struct tick_sched *tick_get_tick_sched(int cpu); 76 77 extern void tick_setup_sched_timer(void); 78 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 79 extern void tick_cancel_sched_timer(int cpu); 80 #else 81 static inline void tick_cancel_sched_timer(int cpu) { } 82 #endif 83 84 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 85 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 86 #else 87 static inline int 88 __tick_broadcast_oneshot_control(enum tick_broadcast_state state) 89 { 90 return -EBUSY; 91 } 92 #endif 93 94 #endif 95