| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |