| 1 |
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| 2 | #ifndef _TICK_SCHED_H
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| 3 | #define _TICK_SCHED_H
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| 4 |
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| 5 | #include <linux/hrtimer.h>
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| 6 |
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| 7 | enum tick_device_mode {
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| 8 | TICKDEV_MODE_PERIODIC,
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| 9 | TICKDEV_MODE_ONESHOT,
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| 10 | };
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| 11 |
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| 12 | struct tick_device {
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| 13 | struct clock_event_device *evtdev;
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| 14 | enum tick_device_mode mode;
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| 15 | };
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| 16 |
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| 17 |
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| 18 | #define TS_FLAG_INIDLE BIT(0)
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| 19 |
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| 20 | #define TS_FLAG_STOPPED BIT(1)
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| 21 | |
| 22 | * Indicator that the CPU is actively in the tick idle mode;
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| 23 | * it is reset during irq handling phases.
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| 24 |
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| 25 | #define TS_FLAG_IDLE_ACTIVE BIT(2)
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| 26 |
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| 27 | #define TS_FLAG_DO_TIMER_LAST BIT(3)
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| 28 |
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| 29 | #define TS_FLAG_NOHZ BIT(4)
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| 30 |
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| 31 | #define TS_FLAG_HIGHRES BIT(5)
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| 32 |
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| 33 | |
| 34 | * struct tick_sched - sched tick emulation and no idle tick control/stats
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| 35 | *
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| 36 | * @flags: State flags gathering the TS_FLAG_* features
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| 37 | * @got_idle_tick: Tick timer function has run with @inidle set
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| 38 | * @stalled_jiffies: Number of stalled jiffies detected across ticks
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| 39 | * @last_tick_jiffies: Value of jiffies seen on last tick
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| 40 | * @sched_timer: hrtimer to schedule the periodic tick in high
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| 41 | * resolution mode
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| 42 | * @last_tick: Store the last tick expiry time when the tick
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| 43 | * timer is modified for nohz sleeps. This is necessary
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| 44 | * to resume the tick timer operation in the timeline
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| 45 | * when the CPU returns from nohz sleep.
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| 46 | * @next_tick: Next tick to be fired when in dynticks mode.
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| 47 | * @idle_waketime: Time when the idle was interrupted
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| 48 | * @idle_entrytime: Time when the idle call was entered
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| 49 | * @last_jiffies: Base jiffies snapshot when next event was last computed
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| 50 | * @timer_expires_base: Base time clock monotonic for @timer_expires
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| 51 | * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
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| 52 | * @next_timer: Expiry time of next expiring timer for debugging purpose only
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| 53 | * @idle_expires: Next tick in idle, for debugging purpose only
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| 54 | * @idle_calls: Total number of idle calls
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| 55 | * @idle_sleeps: Number of idle calls, where the sched tick was stopped
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| 56 | * @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick
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| 57 | * @check_clocks: Notification mechanism about clocksource changes
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| 58 |
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| 59 | struct tick_sched {
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| 60 |
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| 61 | unsigned long flags;
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| 62 |
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| 63 |
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| 64 | unsigned int stalled_jiffies;
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| 65 | unsigned long last_tick_jiffies;
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| 66 |
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| 67 |
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| 68 | struct hrtimer sched_timer;
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| 69 | ktime_t last_tick;
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| 70 | ktime_t next_tick;
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| 71 | ktime_t idle_waketime;
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| 72 | unsigned int got_idle_tick;
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| 73 |
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| 74 |
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| 75 | ktime_t idle_entrytime;
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| 76 |
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| 77 |
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| 78 | unsigned long last_jiffies;
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| 79 | u64 timer_expires_base;
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| 80 | u64 timer_expires;
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| 81 | u64 next_timer;
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| 82 | ktime_t idle_expires;
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| 83 | unsigned long idle_calls;
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| 84 | unsigned long idle_sleeps;
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| 85 |
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| 86 |
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| 87 | atomic_t tick_dep_mask;
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| 88 |
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| 89 |
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| 90 | unsigned long check_clocks;
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| 91 | };
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| 92 |
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| 93 | extern struct tick_sched *tick_get_tick_sched(int cpu);
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| 94 |
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| 95 | extern void tick_setup_sched_timer(bool hrtimer);
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| 96 | #if defined CONFIG_TICK_ONESHOT
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| 97 | extern void tick_sched_timer_dying(int cpu);
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| 98 | #else
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| 99 | static inline void tick_sched_timer_dying(int cpu) { }
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| 100 | #endif
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| 101 |
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| 102 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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| 103 | extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state);
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| 104 | #else
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| 105 | static inline int
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| 106 | __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
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| 107 | {
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| 108 | return -EBUSY;
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| 109 | }
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| 110 | #endif
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| 111 |
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| 112 | #endif
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