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 _LINUXKPI_LINUX_JIFFIES_H_ 32 #define _LINUXKPI_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_after32(a, b) ((int32_t)((uint32_t)(b) - (uint32_t)(a)) < 0) 49 #define time_before(a, b) time_after(b,a) 50 #define time_before32(a, b) time_after32(b, a) 51 #define time_after_eq(a, b) ((int)((a) - (b)) >= 0) 52 #define time_before_eq(a, b) time_after_eq(b, a) 53 #define time_in_range(a,b,c) \ 54 (time_after_eq(a,b) && time_before_eq(a,c)) 55 #define time_is_after_eq_jiffies(a) time_after_eq(a, jiffies) 56 #define time_is_after_jiffies(a) time_after(a, jiffies) 57 58 #define HZ hz 59 60 extern uint64_t lkpi_nsec2hz_rem; 61 extern uint64_t lkpi_nsec2hz_div; 62 extern uint64_t lkpi_nsec2hz_max; 63 64 extern uint64_t lkpi_usec2hz_rem; 65 extern uint64_t lkpi_usec2hz_div; 66 extern uint64_t lkpi_usec2hz_max; 67 68 extern uint64_t lkpi_msec2hz_rem; 69 extern uint64_t lkpi_msec2hz_div; 70 extern uint64_t lkpi_msec2hz_max; 71 72 static inline int 73 timespec_to_jiffies(const struct timespec *ts) 74 { 75 u64 result; 76 77 result = ((u64)hz * ts->tv_sec) + 78 (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC); 79 if (result > MAX_JIFFY_OFFSET) 80 result = MAX_JIFFY_OFFSET; 81 82 return ((int)result); 83 } 84 85 static inline int 86 msecs_to_jiffies(uint64_t msec) 87 { 88 uint64_t result; 89 90 if (msec > lkpi_msec2hz_max) 91 msec = lkpi_msec2hz_max; 92 result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div); 93 if (result > MAX_JIFFY_OFFSET) 94 result = MAX_JIFFY_OFFSET; 95 96 return ((int)result); 97 } 98 99 static inline int 100 usecs_to_jiffies(uint64_t usec) 101 { 102 uint64_t result; 103 104 if (usec > lkpi_usec2hz_max) 105 usec = lkpi_usec2hz_max; 106 result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div); 107 if (result > MAX_JIFFY_OFFSET) 108 result = MAX_JIFFY_OFFSET; 109 110 return ((int)result); 111 } 112 113 static inline uint64_t 114 nsecs_to_jiffies64(uint64_t nsec) 115 { 116 117 if (nsec > lkpi_nsec2hz_max) 118 nsec = lkpi_nsec2hz_max; 119 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 120 } 121 122 static inline unsigned long 123 nsecs_to_jiffies(uint64_t nsec) 124 { 125 126 if (sizeof(unsigned long) >= sizeof(uint64_t)) { 127 if (nsec > lkpi_nsec2hz_max) 128 nsec = lkpi_nsec2hz_max; 129 } else { 130 if (nsec > (lkpi_nsec2hz_max >> 32)) 131 nsec = (lkpi_nsec2hz_max >> 32); 132 } 133 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 134 } 135 136 static inline uint64_t 137 jiffies_to_nsecs(int j) 138 { 139 140 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j); 141 } 142 143 static inline uint64_t 144 jiffies_to_usecs(int j) 145 { 146 147 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j); 148 } 149 150 static inline uint64_t 151 get_jiffies_64(void) 152 { 153 154 return ((uint64_t)(unsigned int)ticks); 155 } 156 157 static inline int 158 linux_timer_jiffies_until(int expires) 159 { 160 int delta = expires - jiffies; 161 /* guard against already expired values */ 162 if (delta < 1) 163 delta = 1; 164 return (delta); 165 } 166 167 #endif /* _LINUXKPI_LINUX_JIFFIES_H_ */ 168