/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _TICK_SCHED_H #define _TICK_SCHED_H #include <linux/hrtimer.h> enum tick_device_mode { TICKDEV_MODE_PERIODIC, TICKDEV_MODE_ONESHOT, }; struct tick_device { struct clock_event_device *evtdev; enum tick_device_mode mode; }; /* The CPU is in the tick idle mode */ #define TS_FLAG_INIDLE BIT(0) /* The idle tick has been stopped */ #define TS_FLAG_STOPPED BIT(1) /* * Indicator that the CPU is actively in the tick idle mode; * it is reset during irq handling phases. */ #define TS_FLAG_IDLE_ACTIVE BIT(2) /* CPU was the last one doing do_timer before going idle */ #define TS_FLAG_DO_TIMER_LAST BIT(3) /* NO_HZ is enabled */ #define TS_FLAG_NOHZ BIT(4) /* High resolution tick mode */ #define TS_FLAG_HIGHRES BIT(5) /** * struct tick_sched - sched tick emulation and no idle tick control/stats * * @flags: State flags gathering the TS_FLAG_* features * @got_idle_tick: Tick timer function has run with @inidle set * @stalled_jiffies: Number of stalled jiffies detected across ticks * @last_tick_jiffies: Value of jiffies seen on last tick * @sched_timer: hrtimer to schedule the periodic tick in high * resolution mode * @last_tick: Store the last tick expiry time when the tick * timer is modified for nohz sleeps. This is necessary * to resume the tick timer operation in the timeline * when the CPU returns from nohz sleep. * @next_tick: Next tick to be fired when in dynticks mode. * @idle_jiffies: jiffies at the entry to idle for idle time accounting * @idle_waketime: Time when the idle was interrupted * @idle_sleeptime_seq: sequence counter for data consistency * @idle_entrytime: Time when the idle call was entered * @last_jiffies: Base jiffies snapshot when next event was last computed * @timer_expires_base: Base time clock monotonic for @timer_expires * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped) * @next_timer: Expiry time of next expiring timer for debugging purpose only * @idle_expires: Next tick in idle, for debugging purpose only * @idle_calls: Total number of idle calls * @idle_sleeps: Number of idle calls, where the sched tick was stopped * @idle_exittime: Time when the idle state was left * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding * @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick * @check_clocks: Notification mechanism about clocksource changes */ struct tick_sched { /* Common flags */ unsigned long flags; /* Tick handling: jiffies stall check */ unsigned int stalled_jiffies; unsigned long last_tick_jiffies; /* Tick handling */ struct hrtimer sched_timer; ktime_t last_tick; ktime_t next_tick; unsigned long idle_jiffies; ktime_t idle_waketime; unsigned int got_idle_tick; /* Idle entry */ seqcount_t idle_sleeptime_seq; ktime_t idle_entrytime; /* Tick stop */ unsigned long last_jiffies; u64 timer_expires_base; u64 timer_expires; u64 next_timer; ktime_t idle_expires; unsigned long idle_calls; unsigned long idle_sleeps; /* Idle exit */ ktime_t idle_exittime; ktime_t idle_sleeptime; ktime_t iowait_sleeptime; /* Full dynticks handling */ atomic_t tick_dep_mask; /* Clocksource changes */ unsigned long check_clocks; }; extern struct tick_sched *tick_get_tick_sched(int cpu); extern void tick_setup_sched_timer(bool hrtimer); #if defined CONFIG_TICK_ONESHOT extern void tick_sched_timer_dying(int cpu); #else static inline void tick_sched_timer_dying(int cpu) { } #endif #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); #else static inline int __tick_broadcast_oneshot_control(enum tick_broadcast_state state) { return -EBUSY; } #endif #endif
