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_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 57 static inline int 58 timespec_to_jiffies(const struct timespec *ts) 59 { 60 u64 result; 61 62 result = ((u64)hz * ts->tv_sec) + 63 (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC); 64 if (result > MAX_JIFFY_OFFSET) 65 result = MAX_JIFFY_OFFSET; 66 67 return ((int)result); 68 } 69 70 static inline int 71 msecs_to_jiffies(uint64_t msec) 72 { 73 uint64_t msec_max, result; 74 75 msec_max = -1ULL / (uint64_t)hz; 76 if (msec > msec_max) 77 msec = msec_max; 78 result = howmany(msec * (uint64_t)hz, 1000ULL); 79 if (result > MAX_JIFFY_OFFSET) 80 result = MAX_JIFFY_OFFSET; 81 82 return ((int)result); 83 } 84 85 static inline int 86 usecs_to_jiffies(uint64_t usec) 87 { 88 uint64_t usec_max, result; 89 90 usec_max = -1ULL / (uint64_t)hz; 91 if (usec > usec_max) 92 usec = usec_max; 93 result = howmany(usec * (uint64_t)hz, 1000000ULL); 94 if (result > MAX_JIFFY_OFFSET) 95 result = MAX_JIFFY_OFFSET; 96 97 return ((int)result); 98 } 99 100 static inline uint64_t 101 nsecs_to_jiffies64(uint64_t nsec) 102 { 103 uint64_t nsec_max, result; 104 105 nsec_max = -1ULL / (uint64_t)hz; 106 if (nsec > nsec_max) 107 nsec = nsec_max; 108 result = howmany(nsec * (uint64_t)hz, 1000000000ULL); 109 if (result > MAX_JIFFY_OFFSET) 110 result = MAX_JIFFY_OFFSET; 111 112 return (result); 113 } 114 115 static inline uint64_t 116 nsecs_to_jiffies(uint64_t n) 117 { 118 119 return (usecs_to_jiffies(howmany(n, 1000ULL))); 120 } 121 122 static inline uint64_t 123 jiffies_to_nsecs(int j) 124 { 125 126 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j); 127 } 128 129 static inline uint64_t 130 jiffies_to_usecs(int j) 131 { 132 133 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j); 134 } 135 136 static inline uint64_t 137 get_jiffies_64(void) 138 { 139 140 return ((uint64_t)(unsigned int)ticks); 141 } 142 143 static inline int 144 linux_timer_jiffies_until(int expires) 145 { 146 int delta = expires - jiffies; 147 /* guard against already expired values */ 148 if (delta < 1) 149 delta = 1; 150 return (delta); 151 } 152 153 #endif /* _LINUX_JIFFIES_H_ */ 154