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