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 #ifndef _LINUXKPI_LINUX_JIFFIES_H_ 30 #define _LINUXKPI_LINUX_JIFFIES_H_ 31 32 #include <linux/types.h> 33 #include <linux/time.h> 34 35 #include <sys/time.h> 36 #include <sys/kernel.h> 37 #include <sys/limits.h> 38 39 #define jiffies ticks 40 #define jiffies_64 ticks 41 #define jiffies_to_msecs(x) ((unsigned int)(((int64_t)(int)(x)) * 1000 / hz)) 42 43 #define MAX_JIFFY_OFFSET ((INT_MAX >> 1) - 1) 44 45 #define time_after(a, b) ((int)((b) - (a)) < 0) 46 #define time_after32(a, b) ((int32_t)((uint32_t)(b) - (uint32_t)(a)) < 0) 47 #define time_before(a, b) time_after(b,a) 48 #define time_before32(a, b) time_after32(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 #define time_is_after_jiffies(a) time_after(a, jiffies) 55 56 #define HZ hz 57 58 extern uint64_t lkpi_nsec2hz_rem; 59 extern uint64_t lkpi_nsec2hz_div; 60 extern uint64_t lkpi_nsec2hz_max; 61 62 extern uint64_t lkpi_usec2hz_rem; 63 extern uint64_t lkpi_usec2hz_div; 64 extern uint64_t lkpi_usec2hz_max; 65 66 extern uint64_t lkpi_msec2hz_rem; 67 extern uint64_t lkpi_msec2hz_div; 68 extern uint64_t lkpi_msec2hz_max; 69 70 static inline int 71 timespec_to_jiffies(const struct timespec *ts) 72 { 73 u64 result; 74 75 result = ((u64)hz * ts->tv_sec) + 76 (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC); 77 if (result > MAX_JIFFY_OFFSET) 78 result = MAX_JIFFY_OFFSET; 79 80 return ((int)result); 81 } 82 83 static inline int 84 msecs_to_jiffies(uint64_t msec) 85 { 86 uint64_t result; 87 88 if (msec > lkpi_msec2hz_max) 89 msec = lkpi_msec2hz_max; 90 result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div); 91 if (result > MAX_JIFFY_OFFSET) 92 result = MAX_JIFFY_OFFSET; 93 94 return ((int)result); 95 } 96 97 static inline int 98 usecs_to_jiffies(uint64_t usec) 99 { 100 uint64_t result; 101 102 if (usec > lkpi_usec2hz_max) 103 usec = lkpi_usec2hz_max; 104 result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div); 105 if (result > MAX_JIFFY_OFFSET) 106 result = MAX_JIFFY_OFFSET; 107 108 return ((int)result); 109 } 110 111 static inline uint64_t 112 nsecs_to_jiffies64(uint64_t nsec) 113 { 114 115 if (nsec > lkpi_nsec2hz_max) 116 nsec = lkpi_nsec2hz_max; 117 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 118 } 119 120 static inline unsigned long 121 nsecs_to_jiffies(uint64_t nsec) 122 { 123 124 if (sizeof(unsigned long) >= sizeof(uint64_t)) { 125 if (nsec > lkpi_nsec2hz_max) 126 nsec = lkpi_nsec2hz_max; 127 } else { 128 if (nsec > (lkpi_nsec2hz_max >> 32)) 129 nsec = (lkpi_nsec2hz_max >> 32); 130 } 131 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 132 } 133 134 static inline uint64_t 135 jiffies_to_nsecs(int j) 136 { 137 138 return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j); 139 } 140 141 static inline uint64_t 142 jiffies_to_usecs(int j) 143 { 144 145 return ((1000000ULL / hz) * (uint64_t)(unsigned int)j); 146 } 147 148 static inline uint64_t 149 get_jiffies_64(void) 150 { 151 152 return ((uint64_t)(unsigned int)ticks); 153 } 154 155 static inline int 156 linux_timer_jiffies_until(int expires) 157 { 158 int delta = expires - jiffies; 159 /* guard against already expired values */ 160 if (delta < 1) 161 delta = 1; 162 return (delta); 163 } 164 165 #endif /* _LINUXKPI_LINUX_JIFFIES_H_ */ 166