| /* 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; | |
| }; | |
| enum tick_nohz_mode { | |
| NOHZ_MODE_INACTIVE, | |
| NOHZ_MODE_LOWRES, | |
| NOHZ_MODE_HIGHRES, | |
| }; | |
| /** | |
| * struct tick_sched - sched tick emulation and no idle tick control/stats | |
| * @sched_timer: hrtimer to schedule the periodic tick in high | |
| * resolution mode | |
| * @check_clocks: Notification mechanism about clocksource changes | |
| * @nohz_mode: Mode - one state of tick_nohz_mode | |
| * @inidle: Indicator that the CPU is in the tick idle mode | |
| * @tick_stopped: Indicator that the idle tick has been stopped | |
| * @idle_active: Indicator that the CPU is actively in the tick idle mode; | |
| * it is resetted during irq handling phases. | |
| * @do_timer_lst: CPU was the last one doing do_timer before going idle | |
| * @got_idle_tick: Tick timer function has run with @inidle set | |
| * @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_calls: Total number of idle calls | |
| * @idle_sleeps: Number of idle calls, where the sched tick was stopped | |
| * @idle_entrytime: Time when the idle call was entered | |
| * @idle_waketime: Time when the idle was interrupted | |
| * @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 | |
| * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped) | |
| * @timer_expires_base: Base time clock monotonic for @timer_expires | |
| * @next_timer: Expiry time of next expiring timer for debugging purpose only | |
| * @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick | |
| */ | |
| struct tick_sched { | |
| struct hrtimer sched_timer; | |
| unsigned long check_clocks; | |
| enum tick_nohz_mode nohz_mode; | |
| unsigned int inidle : 1; | |
| unsigned int tick_stopped : 1; | |
| unsigned int idle_active : 1; | |
| unsigned int do_timer_last : 1; | |
| unsigned int got_idle_tick : 1; | |
| ktime_t last_tick; | |
| ktime_t next_tick; | |
| unsigned long idle_jiffies; | |
| unsigned long idle_calls; | |
| unsigned long idle_sleeps; | |
| ktime_t idle_entrytime; | |
| ktime_t idle_waketime; | |
| ktime_t idle_exittime; | |
| ktime_t idle_sleeptime; | |
| ktime_t iowait_sleeptime; | |
| unsigned long last_jiffies; | |
| u64 timer_expires; | |
| u64 timer_expires_base; | |
| u64 next_timer; | |
| ktime_t idle_expires; | |
| atomic_t tick_dep_mask; | |
| }; | |
| extern struct tick_sched *tick_get_tick_sched(int cpu); | |
| extern void tick_setup_sched_timer(void); | |
| #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS | |
| extern void tick_cancel_sched_timer(int cpu); | |
| #else | |
| static inline void tick_cancel_sched_timer(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 |