/*-
 * Copyright (c) 2014-2015 Mellanox Technologies, Ltd.
 * Copyright (c) 2015 François Tigeot
 * All rights reserved.
 *
 * 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.
 *
 * $FreeBSD$
 */

#ifndef _LINUX_KTIME_H
#define	_LINUX_KTIME_H

#include <linux/types.h>
#include <linux/time.h>
#include <linux/jiffies.h>

#define ktime_get_ts(x) getnanouptime(x)

/* time values in nanoseconds */
union ktime {
	int64_t tv64;
};

typedef union ktime ktime_t;

#define KTIME_MAX                       ((s64)~((u64)1 << 63))
#define KTIME_SEC_MAX                   (KTIME_MAX / NSEC_PER_SEC)

static inline int64_t
ktime_to_ns(ktime_t kt)
{
	return kt.tv64;
}

static inline ktime_t
ns_to_ktime(uint64_t nsec)
{
	ktime_t kt;

	kt.tv64 = nsec;
	return (kt);
}

static inline int64_t
ktime_divns(const ktime_t kt, int64_t div)
{
	return kt.tv64 / div;
}

static inline int64_t
ktime_to_us(ktime_t kt)
{
        return ktime_divns(kt, NSEC_PER_USEC);
}

static inline int64_t
ktime_to_ms(ktime_t kt)
{
        return ktime_divns(kt, NSEC_PER_MSEC);
}

static inline struct timeval
ktime_to_timeval(ktime_t kt)
{
	return ns_to_timeval(kt.tv64);
}

static inline ktime_t
ktime_add_ns(ktime_t kt, int64_t ns)
{
	ktime_t res;

	res.tv64 = kt.tv64 + ns;
	return kt;
}

static inline ktime_t
ktime_sub_ns(ktime_t kt, int64_t ns)
{
	ktime_t res;

	res.tv64 = kt.tv64 - ns;
	return kt;
}

static inline ktime_t
ktime_set(const long secs, const unsigned long nsecs)
{
	ktime_t retval = { (s64)secs * NSEC_PER_SEC + (s64)nsecs };
	return (retval);
}

static inline ktime_t
ktime_sub(ktime_t lhs, ktime_t rhs)
{
	lhs.tv64 -= rhs.tv64;
	return (lhs);
}

static inline int64_t
ktime_us_delta(ktime_t later, ktime_t earlier)
{
        ktime_t diff = ktime_sub(later, earlier);
        return ktime_to_us(diff);
}

static inline int64_t
ktime_ms_delta(ktime_t later, ktime_t earlier)
{
        ktime_t diff = ktime_sub(later, earlier);
        return ktime_to_ms(diff);
}

static inline ktime_t
ktime_add(ktime_t lhs, ktime_t rhs)
{
	lhs.tv64 += rhs.tv64;
	return (lhs);
}

static inline ktime_t
timespec_to_ktime(struct timespec ts)
{
	return (ktime_set(ts.tv_sec, ts.tv_nsec));
}

static inline ktime_t
timeval_to_ktime(struct timeval tv)
{
	return (ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC));
}

#define ktime_to_timespec(kt)		ns_to_timespec((kt).tv64)
#define ktime_to_timeval(kt)		ns_to_timeval((kt).tv64)
#define ktime_to_ns(kt)			((kt).tv64)

static inline int64_t
ktime_get_ns(void)
{
	struct timespec ts;
	ktime_t kt;

	ktime_get_ts(&ts);
	kt = timespec_to_ktime(ts);
	return (ktime_to_ns(kt));
}

#define	ktime_get_raw_ns()	ktime_get_ns()

static inline ktime_t
ktime_get(void)
{
	struct timespec ts;

	ktime_get_ts(&ts);
	return (timespec_to_ktime(ts));
}

static inline ktime_t
ktime_get_boottime(void)
{
	struct timespec ts;

	nanouptime(&ts);
	return (timespec_to_ktime(ts));
}

static inline ktime_t
ktime_get_real(void)
{
	struct timespec ts;

	nanotime(&ts);
	return (timespec_to_ktime(ts));
}

#endif /* _LINUX_KTIME_H */