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/**
* Copyright (C) ARM Limited 2011-2014. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
void (*callback)(void);
DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
DEFINE_PER_CPU(ktime_t, hrtimer_expire);
DEFINE_PER_CPU(int, hrtimer_is_active);
static ktime_t profiling_interval;
static void gator_hrtimer_online(void);
static void gator_hrtimer_offline(void);
static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
{
int cpu = get_logical_cpu();
hrtimer_forward(hrtimer, per_cpu(hrtimer_expire, cpu), profiling_interval);
per_cpu(hrtimer_expire, cpu) = ktime_add(per_cpu(hrtimer_expire, cpu), profiling_interval);
(*callback)();
return HRTIMER_RESTART;
}
static void gator_hrtimer_online(void)
{
int cpu = get_logical_cpu();
struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
if (per_cpu(hrtimer_is_active, cpu) || profiling_interval.tv64 == 0)
return;
per_cpu(hrtimer_is_active, cpu) = 1;
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
hrtimer->function = gator_hrtimer_notify;
#ifdef CONFIG_PREEMPT_RT_BASE
hrtimer->irqsafe = 1;
#endif
per_cpu(hrtimer_expire, cpu) = ktime_add(hrtimer->base->get_time(), profiling_interval);
hrtimer_start(hrtimer, per_cpu(hrtimer_expire, cpu), HRTIMER_MODE_ABS_PINNED);
}
static void gator_hrtimer_offline(void)
{
int cpu = get_logical_cpu();
struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
if (!per_cpu(hrtimer_is_active, cpu))
return;
per_cpu(hrtimer_is_active, cpu) = 0;
hrtimer_cancel(hrtimer);
}
static int gator_hrtimer_init(int interval, void (*func)(void))
{
int cpu;
(callback) = (func);
for_each_present_cpu(cpu) {
per_cpu(hrtimer_is_active, cpu) = 0;
}
/* calculate profiling interval */
if (interval > 0)
profiling_interval = ns_to_ktime(1000000000UL / interval);
else
profiling_interval.tv64 = 0;
return 0;
}
static void gator_hrtimer_shutdown(void)
{
/* empty */
}
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