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/**
* Copyright (C) ARM Limited 2011-2012. 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.
*
*/
// gator_hrtimer_perf.c is used if perf is supported
// update, gator_hrtimer_gator.c always used until issues resolved with perf hrtimers
#if 1
void (*callback)(void);
DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
DEFINE_PER_CPU(int, hrtimer_is_active);
static ktime_t profiling_interval;
static void gator_hrtimer_online(int cpu);
static void gator_hrtimer_offline(int cpu);
static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
{
hrtimer_forward_now(hrtimer, profiling_interval);
(*callback)();
return HRTIMER_RESTART;
}
static void gator_hrtimer_switch_cpus_online(void *unused)
{
gator_hrtimer_online(smp_processor_id());
}
static void gator_hrtimer_online(int cpu)
{
struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
if (cpu != smp_processor_id()) {
smp_call_function_single(cpu, gator_hrtimer_switch_cpus_online, NULL, 1);
return;
}
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_REL);
hrtimer->function = gator_hrtimer_notify;
hrtimer_start(hrtimer, profiling_interval, HRTIMER_MODE_REL_PINNED);
}
static void gator_hrtimer_switch_cpus_offline(void *unused)
{
gator_hrtimer_offline(smp_processor_id());
}
static void gator_hrtimer_offline(int cpu)
{
struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
if (cpu != smp_processor_id()) {
smp_call_function_single(cpu, gator_hrtimer_switch_cpus_offline, NULL, 1);
return;
}
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 */
}
#endif
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