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 * @check_clocks: Notification mechanism about clocksource changes 28 * @nohz_mode: Mode - one state of tick_nohz_mode 29 * @inidle: Indicator that the CPU is in the tick idle mode 30 * @tick_stopped: Indicator that the idle tick has been stopped 31 * @idle_active: Indicator that the CPU is actively in the tick idle mode; 32 * it is reset during irq handling phases. 33 * @do_timer_lst: CPU was the last one doing do_timer before going idle 34 * @got_idle_tick: Tick timer function has run with @inidle set 35 * @last_tick: Store the last tick expiry time when the tick 36 * timer is modified for nohz sleeps. This is necessary 37 * to resume the tick timer operation in the timeline 38 * when the CPU returns from nohz sleep. 39 * @next_tick: Next tick to be fired when in dynticks mode. 40 * @idle_jiffies: jiffies at the entry to idle for idle time accounting 41 * @idle_calls: Total number of idle calls 42 * @idle_sleeps: Number of idle calls, where the sched tick was stopped 43 * @idle_entrytime: Time when the idle call was entered 44 * @idle_waketime: Time when the idle was interrupted 45 * @idle_exittime: Time when the idle state was left 46 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped 47 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding 48 * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped) 49 * @timer_expires_base: Base time clock monotonic for @timer_expires 50 * @next_timer: Expiry time of next expiring timer for debugging purpose only 51 * @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick 52 * @last_tick_jiffies: Value of jiffies seen on last tick 53 * @stalled_jiffies: Number of stalled jiffies detected across ticks 54 */ 55 struct tick_sched { 56 struct hrtimer sched_timer; 57 unsigned long check_clocks; 58 enum tick_nohz_mode nohz_mode; 59 60 unsigned int inidle : 1; 61 unsigned int tick_stopped : 1; 62 unsigned int idle_active : 1; 63 unsigned int do_timer_last : 1; 64 unsigned int got_idle_tick : 1; 65 66 ktime_t last_tick; 67 ktime_t next_tick; 68 unsigned long idle_jiffies; 69 unsigned long idle_calls; 70 unsigned long idle_sleeps; 71 ktime_t idle_entrytime; 72 ktime_t idle_waketime; 73 ktime_t idle_exittime; 74 ktime_t idle_sleeptime; 75 ktime_t iowait_sleeptime; 76 unsigned long last_jiffies; 77 u64 timer_expires; 78 u64 timer_expires_base; 79 u64 next_timer; 80 ktime_t idle_expires; 81 atomic_t tick_dep_mask; 82 unsigned long last_tick_jiffies; 83 unsigned int stalled_jiffies; 84 }; 85 86 extern struct tick_sched *tick_get_tick_sched(int cpu); 87 88 extern void tick_setup_sched_timer(void); 89 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS 90 extern void tick_cancel_sched_timer(int cpu); 91 #else tick_cancel_sched_timer(int cpu)92static inline void tick_cancel_sched_timer(int cpu) { } 93 #endif 94 95 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 96 extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); 97 #else 98 static inline int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)99__tick_broadcast_oneshot_control(enum tick_broadcast_state state) 100 { 101 return -EBUSY; 102 } 103 #endif 104 105 #endif 106