xref: /dragonfly/sys/dev/drm/include/linux/ktime.h (revision fe08e20d)
1 /*
2  * Copyright (c) 2015-2017 François Tigeot
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice unmodified, this list of conditions, and the following
10  *    disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #ifndef _LINUX_KTIME_H_
28 #define _LINUX_KTIME_H_
29 
30 #include <linux/time.h>
31 #include <linux/jiffies.h>
32 
33 /* time values in nanoseconds */
34 union ktime {
35 	int64_t tv64;
36 };
37 
38 typedef union ktime ktime_t;
39 
40 static inline ktime_t
41 ktime_set(const s64 secs, const unsigned long nsecs)
42 {
43 	ktime_t kt;
44 
45 	kt.tv64 = secs * NSEC_PER_SEC + (s64)nsecs;
46 	return kt;
47 }
48 
49 static inline s64
50 ktime_to_us(const ktime_t kt)
51 {
52 	return kt.tv64 / NSEC_PER_USEC;
53 }
54 
55 static inline s64
56 ktime_us_delta(const ktime_t later, const ktime_t earlier)
57 {
58 	return later.tv64 - earlier.tv64;
59 }
60 
61 static inline int64_t ktime_to_ns(ktime_t kt)
62 {
63 	return kt.tv64;
64 }
65 
66 static inline struct timeval ktime_to_timeval(ktime_t kt)
67 {
68 	return ns_to_timeval(kt.tv64);
69 }
70 
71 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns)
72 {
73 	ktime_t res;
74 
75 	res.tv64 = kt.tv64 + ns;
76 	return kt;
77 }
78 
79 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns)
80 {
81 	ktime_t res;
82 
83 	res.tv64 = kt.tv64 - ns;
84 	return kt;
85 }
86 
87 static inline ktime_t ktime_get(void)
88 {
89 	struct timespec ts;
90 	ktime_t kt;
91 
92 	nanouptime(&ts);
93 	kt.tv64 = (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
94 	return kt;
95 }
96 
97 #include <linux/timekeeping.h>
98 
99 #endif	/* _LINUX_KTIME_H_ */
100