/**
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* Copyright (C) ARM Limited 2011-2016. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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static void (*callback)(void);
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static DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
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static DEFINE_PER_CPU(ktime_t, hrtimer_expire);
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static DEFINE_PER_CPU(int, hrtimer_is_active);
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static ktime_t profiling_interval;
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static void gator_hrtimer_online(void);
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static void gator_hrtimer_offline(void);
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static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
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{
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int cpu = get_logical_cpu();
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hrtimer_forward(hrtimer, per_cpu(hrtimer_expire, cpu), profiling_interval);
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per_cpu(hrtimer_expire, cpu) = ktime_add(per_cpu(hrtimer_expire, cpu), profiling_interval);
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(*callback)();
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return HRTIMER_RESTART;
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}
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static void gator_hrtimer_online(void)
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{
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int cpu = get_logical_cpu();
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struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
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if (per_cpu(hrtimer_is_active, cpu) || (ktime_to_ns(profiling_interval) == 0))
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return;
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per_cpu(hrtimer_is_active, cpu) = 1;
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hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
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hrtimer->function = gator_hrtimer_notify;
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#ifdef CONFIG_PREEMPT_RT_BASE
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hrtimer->irqsafe = 1;
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#endif
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per_cpu(hrtimer_expire, cpu) = ktime_add(hrtimer->base->get_time(), profiling_interval);
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hrtimer_start(hrtimer, per_cpu(hrtimer_expire, cpu), HRTIMER_MODE_ABS_PINNED);
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}
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static void gator_hrtimer_offline(void)
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{
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int cpu = get_logical_cpu();
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struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
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if (!per_cpu(hrtimer_is_active, cpu))
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return;
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per_cpu(hrtimer_is_active, cpu) = 0;
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hrtimer_cancel(hrtimer);
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}
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static int gator_hrtimer_init(int interval, void (*func)(void))
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{
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int cpu;
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(callback) = (func);
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for_each_present_cpu(cpu) {
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per_cpu(hrtimer_is_active, cpu) = 0;
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}
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/* calculate profiling interval */
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if (interval > 0)
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profiling_interval = ns_to_ktime(1000000000UL / interval);
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else
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profiling_interval = ns_to_ktime(0);
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return 0;
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}
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static void gator_hrtimer_shutdown(void)
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{
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/* empty */
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}
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