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: stable/11/sys/compat/linuxkpi/common/include/linux/jiffies.h 358700 2020-03-06 13:58:08Z hselasky $
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_before(a, b)	time_after(b,a)
49#define	time_after_eq(a, b)	((int)((a) - (b)) >= 0)
50#define	time_before_eq(a, b)	time_after_eq(b, a)
51#define	time_in_range(a,b,c)	\
52	(time_after_eq(a,b) && time_before_eq(a,c))
53#define	time_is_after_eq_jiffies(a) time_after_eq(a, jiffies)
54
55#define	HZ	hz
56
57extern uint64_t lkpi_nsec2hz_rem;
58extern uint64_t lkpi_nsec2hz_div;
59extern uint64_t lkpi_nsec2hz_max;
60
61extern uint64_t lkpi_usec2hz_rem;
62extern uint64_t lkpi_usec2hz_div;
63extern uint64_t lkpi_usec2hz_max;
64
65extern uint64_t lkpi_msec2hz_rem;
66extern uint64_t lkpi_msec2hz_div;
67extern uint64_t lkpi_msec2hz_max;
68
69static inline int
70timespec_to_jiffies(const struct timespec *ts)
71{
72	u64 result;
73
74	result = ((u64)hz * ts->tv_sec) +
75	    (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
76	if (result > MAX_JIFFY_OFFSET)
77		result = MAX_JIFFY_OFFSET;
78
79	return ((int)result);
80}
81
82static inline int
83msecs_to_jiffies(uint64_t msec)
84{
85	uint64_t result;
86
87	if (msec > lkpi_msec2hz_max)
88		msec = lkpi_msec2hz_max;
89	result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div);
90	if (result > MAX_JIFFY_OFFSET)
91		result = MAX_JIFFY_OFFSET;
92
93	return ((int)result);
94}
95
96static inline int
97usecs_to_jiffies(uint64_t usec)
98{
99	uint64_t result;
100
101	if (usec > lkpi_usec2hz_max)
102		usec = lkpi_usec2hz_max;
103	result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div);
104	if (result > MAX_JIFFY_OFFSET)
105		result = MAX_JIFFY_OFFSET;
106
107	return ((int)result);
108}
109
110static inline uint64_t
111nsecs_to_jiffies64(uint64_t nsec)
112{
113
114	if (nsec > lkpi_nsec2hz_max)
115		nsec = lkpi_nsec2hz_max;
116	return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
117}
118
119static inline unsigned long
120nsecs_to_jiffies(uint64_t nsec)
121{
122
123	if (sizeof(unsigned long) >= sizeof(uint64_t)) {
124		if (nsec > lkpi_nsec2hz_max)
125			nsec = lkpi_nsec2hz_max;
126	} else {
127		if (nsec > (lkpi_nsec2hz_max >> 32))
128			nsec = (lkpi_nsec2hz_max >> 32);
129	}
130	return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
131}
132
133static inline uint64_t
134jiffies_to_nsecs(int j)
135{
136
137	return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
138}
139
140static inline uint64_t
141jiffies_to_usecs(int j)
142{
143
144	return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
145}
146
147static inline uint64_t
148get_jiffies_64(void)
149{
150
151	return ((uint64_t)(unsigned int)ticks);
152}
153
154static inline int
155linux_timer_jiffies_until(int expires)
156{
157	int delta = expires - jiffies;
158	/* guard against already expired values */
159	if (delta < 1)
160		delta = 1;
161	return (delta);
162}
163
164#endif	/* _LINUX_JIFFIES_H_ */
165