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)(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 54 #define HZ hz 55 56 static inline int 57 timespec_to_jiffies(const struct timespec *ts) 58 { 59 u64 result; 60 61 result = ((u64)hz * ts->tv_sec) + 62 (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC); 63 if (result > MAX_JIFFY_OFFSET) 64 result = MAX_JIFFY_OFFSET; 65 66 return ((int)result); 67 } 68 69 static inline int 70 msecs_to_jiffies(const u64 msec) 71 { 72 u64 result; 73 74 result = howmany(msec * (u64)hz, 1000ULL); 75 if (result > MAX_JIFFY_OFFSET) 76 result = MAX_JIFFY_OFFSET; 77 78 return ((int)result); 79 } 80 81 static inline int 82 usecs_to_jiffies(const u64 u) 83 { 84 u64 result; 85 86 result = howmany(u * (u64)hz, 1000000ULL); 87 if (result > MAX_JIFFY_OFFSET) 88 result = MAX_JIFFY_OFFSET; 89 90 return ((int)result); 91 } 92 93 static inline u64 94 nsecs_to_jiffies(const u64 n) 95 { 96 return (usecs_to_jiffies(howmany(n, 1000ULL))); 97 } 98 99 static inline u64 100 get_jiffies_64(void) 101 { 102 return ((u64)(unsigned)ticks); 103 } 104 105 static inline int 106 linux_timer_jiffies_until(unsigned long expires) 107 { 108 int delta = expires - jiffies; 109 /* guard against already expired values */ 110 if (delta < 1) 111 delta = 1; 112 return (delta); 113 } 114 115 #endif /* _LINUX_JIFFIES_H_ */ 116