xref: /freebsd/sys/compat/linuxkpi/common/include/linux/jiffies.h (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
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 
59 extern uint64_t lkpi_nsec2hz_rem;
60 extern uint64_t lkpi_nsec2hz_div;
61 extern uint64_t lkpi_nsec2hz_max;
62 
63 extern uint64_t lkpi_usec2hz_rem;
64 extern uint64_t lkpi_usec2hz_div;
65 extern uint64_t lkpi_usec2hz_max;
66 
67 extern uint64_t lkpi_msec2hz_rem;
68 extern uint64_t lkpi_msec2hz_div;
69 extern uint64_t lkpi_msec2hz_max;
70 
71 static inline int
72 timespec_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 
84 static inline int
85 msecs_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 
98 static inline int
99 usecs_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 
112 static inline uint64_t
113 nsecs_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 
121 static inline unsigned long
122 nsecs_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 
135 static inline uint64_t
136 jiffies_to_nsecs(int j)
137 {
138 
139 	return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
140 }
141 
142 static inline uint64_t
143 jiffies_to_usecs(int j)
144 {
145 
146 	return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
147 }
148 
149 static inline uint64_t
150 get_jiffies_64(void)
151 {
152 
153 	return ((uint64_t)(unsigned int)ticks);
154 }
155 
156 static inline int
157 linux_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