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/*-
* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/time.h>
#include <machine/cpu.h>
#include <linux/hrtimer.h>
static void
hrtimer_call_handler(void *arg)
{
struct hrtimer *hrtimer;
enum hrtimer_restart ret;
hrtimer = arg;
ret = hrtimer->function(hrtimer);
if (ret == HRTIMER_RESTART) {
callout_schedule_sbt(&hrtimer->callout,
nstosbt(hrtimer->expires), nstosbt(hrtimer->precision), 0);
} else {
callout_deactivate(&hrtimer->callout);
}
}
bool
linux_hrtimer_active(struct hrtimer *hrtimer)
{
bool ret;
mtx_lock(&hrtimer->mtx);
ret = callout_active(&hrtimer->callout);
mtx_unlock(&hrtimer->mtx);
return (ret);
}
/*
* Cancel active hrtimer.
* Return 1 if timer was active and cancellation succeeded, or 0 otherwise.
*/
int
linux_hrtimer_cancel(struct hrtimer *hrtimer)
{
return (callout_drain(&hrtimer->callout) > 0);
}
void
linux_hrtimer_init(struct hrtimer *hrtimer)
{
memset(hrtimer, 0, sizeof(*hrtimer));
mtx_init(&hrtimer->mtx, "hrtimer", NULL,
MTX_DEF | MTX_RECURSE | MTX_NOWITNESS);
callout_init_mtx(&hrtimer->callout, &hrtimer->mtx, 0);
}
void
linux_hrtimer_set_expires(struct hrtimer *hrtimer, ktime_t time)
{
hrtimer->expires = ktime_to_ns(time);
}
void
linux_hrtimer_start(struct hrtimer *hrtimer, ktime_t time)
{
linux_hrtimer_start_range_ns(hrtimer, time, 0);
}
void
linux_hrtimer_start_range_ns(struct hrtimer *hrtimer, ktime_t time,
int64_t nsec)
{
mtx_lock(&hrtimer->mtx);
hrtimer->precision = nsec;
callout_reset_sbt(&hrtimer->callout, nstosbt(ktime_to_ns(time)),
nstosbt(nsec), hrtimer_call_handler, hrtimer, 0);
mtx_unlock(&hrtimer->mtx);
}
void
linux_hrtimer_forward_now(struct hrtimer *hrtimer, ktime_t interval)
{
mtx_lock(&hrtimer->mtx);
callout_reset_sbt(&hrtimer->callout, nstosbt(ktime_to_ns(interval)),
nstosbt(hrtimer->precision), hrtimer_call_handler, hrtimer, 0);
mtx_unlock(&hrtimer->mtx);
}
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