projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| c1797baf TG |
2 | #ifndef _TICK_SCHED_H |
| 3 | #define _TICK_SCHED_H | |
| 4 | ||
| 5 | #include <linux/hrtimer.h> | |
| 6 | ||
| 7270d11c TG |
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 | ||
| c1797baf TG |
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. | |
| 411fe24e | 31 | * @next_tick: Next tick to be fired when in dynticks mode. |
| c1797baf TG |
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 | |
| 23a8d888 RW |
41 | * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped) |
| 42 | * @timer_expires_base: Base time clock monotonic for @timer_expires | |
| c1797baf TG |
43 | * @do_timer_lst: CPU was the last one doing do_timer before going idle |
| 44 | */ | |
| 45 | struct tick_sched { | |
| 46 | struct hrtimer sched_timer; | |
| 47 | unsigned long check_clocks; | |
| 48 | enum tick_nohz_mode nohz_mode; | |
| 49 | ktime_t last_tick; | |
| 411fe24e | 50 | ktime_t next_tick; |
| c1797baf TG |
51 | int inidle; |
| 52 | int tick_stopped; | |
| 53 | unsigned long idle_jiffies; | |
| 54 | unsigned long idle_calls; | |
| 55 | unsigned long idle_sleeps; | |
| 56 | int idle_active; | |
| 57 | ktime_t idle_entrytime; | |
| 58 | ktime_t idle_waketime; | |
| 59 | ktime_t idle_exittime; | |
| 60 | ktime_t idle_sleeptime; | |
| 61 | ktime_t iowait_sleeptime; | |
| c1797baf | 62 | unsigned long last_jiffies; |
| 23a8d888 RW |
63 | u64 timer_expires; |
| 64 | u64 timer_expires_base; | |
| c1ad348b | 65 | u64 next_timer; |
| c1797baf TG |
66 | ktime_t idle_expires; |
| 67 | int do_timer_last; | |
| f009a7a7 | 68 | atomic_t tick_dep_mask; |
| c1797baf TG |
69 | }; |
| 70 | ||
| 71 | extern struct tick_sched *tick_get_tick_sched(int cpu); | |
| 72 | ||
| 73 | extern void tick_setup_sched_timer(void); | |
| 74 | #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS | |
| 75 | extern void tick_cancel_sched_timer(int cpu); | |
| 76 | #else | |
| 77 | static inline void tick_cancel_sched_timer(int cpu) { } | |
| 78 | #endif | |
| 79 | ||
| f32dd117 TG |
80 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
| 81 | extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); | |
| 82 | #else | |
| 83 | static inline int | |
| 84 | __tick_broadcast_oneshot_control(enum tick_broadcast_state state) | |
| 85 | { | |
| 86 | return -EBUSY; | |
| 87 | } | |
| 88 | #endif | |
| 89 | ||
| c1797baf | 90 | #endif |