jiffies.h revision 299656 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/jiffies.h 299656 2016-05-13 11:02:02Z hselasky $
30 */
31#ifndef	_LINUX_JIFFIES_H_
32#define	_LINUX_JIFFIES_H_
33
34#include <linux/types.h>
35#include <linux/kernel.h>
36#include <linux/time.h>
37
38#include <sys/time.h>
39#include <sys/kernel.h>
40#include <sys/limits.h>
41
42#define jiffies                 ticks
43#define	jiffies_64		ticks
44#define jiffies_to_msecs(x)     (((int64_t)(x)) * 1000 / hz)
45
46#define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)
47
48#define	time_after(a, b)	((int)((b) - (a)) < 0)
49#define	time_before(a, b)	time_after(b,a)
50#define	time_after_eq(a, b)	((int)((a) - (b)) >= 0)
51#define	time_before_eq(a, b)	time_after_eq(b, a)
52#define	time_in_range(a,b,c)	\
53	(time_after_eq(a,b) && time_before_eq(a,c))
54
55#define	HZ	hz
56
57static inline int
58timespec_to_jiffies(const struct timespec *ts)
59{
60	u64 result;
61
62	result = ((u64)hz * ts->tv_sec) +
63	    (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
64	if (result > MAX_JIFFY_OFFSET)
65		result = MAX_JIFFY_OFFSET;
66
67	return ((int)result);
68}
69
70static inline int
71msecs_to_jiffies(const u64 msec)
72{
73	u64 result;
74
75	result = howmany(msec * (u64)hz, 1000ULL);
76	if (result > MAX_JIFFY_OFFSET)
77		result = MAX_JIFFY_OFFSET;
78
79	return ((int)result);
80}
81
82static inline int
83usecs_to_jiffies(const u64 u)
84{
85	u64 result;
86
87	result = howmany(u * (u64)hz, 1000000ULL);
88	if (result > MAX_JIFFY_OFFSET)
89		result = MAX_JIFFY_OFFSET;
90
91	return ((int)result);
92}
93
94static inline u64
95nsecs_to_jiffies(const u64 n)
96{
97	return (usecs_to_jiffies(howmany(n, 1000ULL)));
98}
99
100static inline u64
101get_jiffies_64(void)
102{
103	return ((u64)(unsigned)ticks);
104}
105
106static inline int
107linux_timer_jiffies_until(unsigned long expires)
108{
109	int delta = expires - jiffies;
110	/* guard against already expired values */
111	if (delta < 1)
112		delta = 1;
113	return (delta);
114}
115
116#endif	/* _LINUX_JIFFIES_H_ */
117