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.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
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.
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.
31 #ifndef _LINUX_JIFFIES_H_
32 #define _LINUX_JIFFIES_H_
34 #include <linux/types.h>
35 #include <linux/time.h>
38 #include <sys/kernel.h>
39 #include <sys/limits.h>
42 #define jiffies_64 ticks
43 #define jiffies_to_msecs(x) (((int64_t)(int)(x)) * 1000 / hz)
45 #define MAX_JIFFY_OFFSET ((INT_MAX >> 1) - 1)
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)
57 extern uint64_t lkpi_nsec2hz_rem;
58 extern uint64_t lkpi_nsec2hz_div;
59 extern uint64_t lkpi_nsec2hz_max;
61 extern uint64_t lkpi_usec2hz_rem;
62 extern uint64_t lkpi_usec2hz_div;
63 extern uint64_t lkpi_usec2hz_max;
65 extern uint64_t lkpi_msec2hz_rem;
66 extern uint64_t lkpi_msec2hz_div;
67 extern uint64_t lkpi_msec2hz_max;
70 timespec_to_jiffies(const struct timespec *ts)
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;
83 msecs_to_jiffies(uint64_t msec)
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;
97 usecs_to_jiffies(uint64_t usec)
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;
107 return ((int)result);
110 static inline uint64_t
111 nsecs_to_jiffies64(uint64_t nsec)
114 if (nsec > lkpi_nsec2hz_max)
115 nsec = lkpi_nsec2hz_max;
116 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
119 static inline unsigned long
120 nsecs_to_jiffies(uint64_t nsec)
123 if (sizeof(unsigned long) >= sizeof(uint64_t)) {
124 if (nsec > lkpi_nsec2hz_max)
125 nsec = lkpi_nsec2hz_max;
127 if (nsec > (lkpi_nsec2hz_max >> 32))
128 nsec = (lkpi_nsec2hz_max >> 32);
130 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
133 static inline uint64_t
134 jiffies_to_nsecs(int j)
137 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
140 static inline uint64_t
141 jiffies_to_usecs(int j)
144 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
147 static inline uint64_t
151 return ((uint64_t)(unsigned int)ticks);
155 linux_timer_jiffies_until(int expires)
157 int delta = expires - jiffies;
158 /* guard against already expired values */
164 #endif /* _LINUX_JIFFIES_H_ */