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 #define time_is_before_jiffies(a) time_before(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
timespec_to_jiffies(const struct timespec * ts)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
msecs_to_jiffies(uint64_t msec)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
usecs_to_jiffies(uint64_t usec)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
nsecs_to_jiffies64(uint64_t nsec)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
nsecs_to_jiffies(uint64_t nsec)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
jiffies_to_nsecs(int j)136 jiffies_to_nsecs(int j)
137 {
138
139 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
140 }
141
142 static inline uint64_t
jiffies_to_usecs(int j)143 jiffies_to_usecs(int j)
144 {
145
146 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
147 }
148
149 static inline uint64_t
get_jiffies_64(void)150 get_jiffies_64(void)
151 {
152
153 return ((uint64_t)(unsigned int)ticks);
154 }
155
156 static inline int
linux_timer_jiffies_until(int expires)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 /* _LINUXKPI_LINUX_JIFFIES_H_ */
167