ktime.h revision 289572 
1/*-
2 * Copyright (c) 2014-2015 Mellanox Technologies, Ltd.
3 * Copyright (c) 2015 Fran��ois Tigeot
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice unmodified, this list of conditions, and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _LINUX_KTIME_H
29#define _LINUX_KTIME_H
30
31#include <linux/types.h>
32#include <linux/time.h>
33#include <linux/jiffies.h>
34
35#define ktime_get_ts(x) getnanouptime(x)
36
37/* time values in nanoseconds */
38union ktime {
39	int64_t tv64;
40};
41
42typedef union ktime ktime_t;
43
44#define KTIME_MAX                       ((s64)~((u64)1 << 63))
45#define KTIME_SEC_MAX                   (KTIME_MAX / NSEC_PER_SEC)
46
47static inline int64_t
48ktime_to_ns(ktime_t kt)
49{
50	return kt.tv64;
51}
52
53static inline struct timeval
54ktime_to_timeval(ktime_t kt)
55{
56	return ns_to_timeval(kt.tv64);
57}
58
59static inline ktime_t
60ktime_add_ns(ktime_t kt, int64_t ns)
61{
62	ktime_t res;
63
64	res.tv64 = kt.tv64 + ns;
65	return kt;
66}
67
68static inline ktime_t
69ktime_sub_ns(ktime_t kt, int64_t ns)
70{
71	ktime_t res;
72
73	res.tv64 = kt.tv64 - ns;
74	return kt;
75}
76
77static inline ktime_t
78ktime_set(const long secs, const unsigned long nsecs)
79{
80	ktime_t retval = { (s64)secs * NSEC_PER_SEC + (s64)nsecs };
81	return (retval);
82}
83
84static inline ktime_t
85ktime_sub(ktime_t lhs, ktime_t rhs)
86{
87	lhs.tv64 -= rhs.tv64;
88	return (lhs);
89}
90
91static inline ktime_t
92ktime_add(ktime_t lhs, ktime_t rhs)
93{
94	lhs.tv64 += rhs.tv64;
95	return (lhs);
96}
97
98static inline ktime_t
99timespec_to_ktime(struct timespec ts)
100{
101	return (ktime_set(ts.tv_sec, ts.tv_nsec));
102}
103
104static inline ktime_t
105timeval_to_ktime(struct timeval tv)
106{
107	return (ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC));
108}
109
110#define ktime_to_timespec(kt)		ns_to_timespec((kt).tv64)
111#define ktime_to_timeval(kt)		ns_to_timeval((kt).tv64)
112#define ktime_to_ns(kt)			((kt).tv64)
113
114static inline s64
115ktime_get_ns(void)
116{
117	struct timespec ts;
118	ktime_t kt;
119
120	ktime_get_ts(&ts);
121	kt = timespec_to_ktime(ts);
122	return (ktime_to_ns(kt));
123}
124
125static inline ktime_t
126ktime_get(void)
127{
128	struct timespec ts;
129
130	ktime_get_ts(&ts);
131	return (timespec_to_ktime(ts));
132}
133
134#endif	/* _LINUX_KTIME_H */
135