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 * $FreeBSD$
30 */
31#ifndef	_LINUX_JIFFIES_H_
32#define	_LINUX_JIFFIES_H_
33
34#include <linux/types.h>
35#include <linux/time.h>
36
37#include <sys/time.h>
38#include <sys/kernel.h>
39#include <sys/limits.h>
40
41#define	jiffies			ticks
42#define	jiffies_64		ticks
43#define	jiffies_to_msecs(x)     (((int64_t)(int)(x)) * 1000 / hz)
44
45#define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)
46
47#define	time_after(a, b)	((int)((b) - (a)) < 0)
48#define	time_after32(a, b)	((int32_t)((uint32_t)(b) - (uint32_t)(a)) < 0)
49#define	time_before(a, b)	time_after(b,a)
50#define	time_before32(a, b)	time_after32(b, a)
51#define	time_after_eq(a, b)	((int)((a) - (b)) >= 0)
52#define	time_before_eq(a, b)	time_after_eq(b, a)
53#define	time_in_range(a,b,c)	\
54	(time_after_eq(a,b) && time_before_eq(a,c))
55#define	time_is_after_eq_jiffies(a) time_after_eq(a, jiffies)
56
57#define	HZ	hz
58
59extern uint64_t lkpi_nsec2hz_rem;
60extern uint64_t lkpi_nsec2hz_div;
61extern uint64_t lkpi_nsec2hz_max;
62
63extern uint64_t lkpi_usec2hz_rem;
64extern uint64_t lkpi_usec2hz_div;
65extern uint64_t lkpi_usec2hz_max;
66
67extern uint64_t lkpi_msec2hz_rem;
68extern uint64_t lkpi_msec2hz_div;
69extern uint64_t lkpi_msec2hz_max;
70
71static inline int
72timespec_to_jiffies(const struct timespec *ts)
73{
74	u64 result;
75
76	result = ((u64)hz * ts->tv_sec) +
77	    (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
78	if (result > MAX_JIFFY_OFFSET)
79		result = MAX_JIFFY_OFFSET;
80
81	return ((int)result);
82}
83
84static inline int
85msecs_to_jiffies(uint64_t msec)
86{
87	uint64_t result;
88
89	if (msec > lkpi_msec2hz_max)
90		msec = lkpi_msec2hz_max;
91	result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div);
92	if (result > MAX_JIFFY_OFFSET)
93		result = MAX_JIFFY_OFFSET;
94
95	return ((int)result);
96}
97
98static inline int
99usecs_to_jiffies(uint64_t usec)
100{
101	uint64_t result;
102
103	if (usec > lkpi_usec2hz_max)
104		usec = lkpi_usec2hz_max;
105	result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div);
106	if (result > MAX_JIFFY_OFFSET)
107		result = MAX_JIFFY_OFFSET;
108
109	return ((int)result);
110}
111
112static inline uint64_t
113nsecs_to_jiffies64(uint64_t nsec)
114{
115
116	if (nsec > lkpi_nsec2hz_max)
117		nsec = lkpi_nsec2hz_max;
118	return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
119}
120
121static inline unsigned long
122nsecs_to_jiffies(uint64_t nsec)
123{
124
125	if (sizeof(unsigned long) >= sizeof(uint64_t)) {
126		if (nsec > lkpi_nsec2hz_max)
127			nsec = lkpi_nsec2hz_max;
128	} else {
129		if (nsec > (lkpi_nsec2hz_max >> 32))
130			nsec = (lkpi_nsec2hz_max >> 32);
131	}
132	return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
133}
134
135static inline uint64_t
136jiffies_to_nsecs(int j)
137{
138
139	return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
140}
141
142static inline uint64_t
143jiffies_to_usecs(int j)
144{
145
146	return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
147}
148
149static inline uint64_t
150get_jiffies_64(void)
151{
152
153	return ((uint64_t)(unsigned int)ticks);
154}
155
156static inline int
157linux_timer_jiffies_until(int expires)
158{
159	int delta = expires - jiffies;
160	/* guard against already expired values */
161	if (delta < 1)
162		delta = 1;
163	return (delta);
164}
165
166#endif	/* _LINUX_JIFFIES_H_ */
167