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 extern uint64_t lkpi_nsec2hz_rem; 58 extern uint64_t lkpi_nsec2hz_div; 59 extern uint64_t lkpi_nsec2hz_max; 60 61 extern uint64_t lkpi_usec2hz_rem; 62 extern uint64_t lkpi_usec2hz_div; 63 extern uint64_t lkpi_usec2hz_max; 64 65 extern uint64_t lkpi_msec2hz_rem; 66 extern uint64_t lkpi_msec2hz_div; 67 extern uint64_t lkpi_msec2hz_max; 68 69 static inline int 70 timespec_to_jiffies(const struct timespec *ts) 71 { 72 u64 result; 73 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; 78 79 return ((int)result); 80 } 81 82 static inline int 83 msecs_to_jiffies(uint64_t msec) 84 { 85 uint64_t result; 86 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; 92 93 return ((int)result); 94 } 95 96 static inline int 97 usecs_to_jiffies(uint64_t usec) 98 { 99 uint64_t result; 100 101 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; 106 107 return ((int)result); 108 } 109 110 static inline uint64_t 111 nsecs_to_jiffies64(uint64_t nsec) 112 { 113 114 if (nsec > lkpi_nsec2hz_max) 115 nsec = lkpi_nsec2hz_max; 116 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 117 } 118 119 static inline unsigned long 120 nsecs_to_jiffies(uint64_t nsec) 121 { 122 123 if (sizeof(unsigned long) >= sizeof(uint64_t)) { 124 if (nsec > lkpi_nsec2hz_max) 125 nsec = lkpi_nsec2hz_max; 126 } else { 127 if (nsec > (lkpi_nsec2hz_max >> 32)) 128 nsec = (lkpi_nsec2hz_max >> 32); 129 } 130 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 131 } 132 133 static inline uint64_t 134 jiffies_to_nsecs(int j) 135 { 136 137 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j); 138 } 139 140 static inline uint64_t 141 jiffies_to_usecs(int j) 142 { 143 144 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j); 145 } 146 147 static inline uint64_t 148 get_jiffies_64(void) 149 { 150 151 return ((uint64_t)(unsigned int)ticks); 152 } 153 154 static inline int 155 linux_timer_jiffies_until(int expires) 156 { 157 int delta = expires - jiffies; 158 /* guard against already expired values */ 159 if (delta < 1) 160 delta = 1; 161 return (delta); 162 } 163 164 #endif /* _LINUX_JIFFIES_H_ */ 165