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/kernel.h> 36 #include <sys/limits.h> 37 #include <sys/time.h> 38 39 extern unsigned long jiffies; /* defined in sys/kern/subr_ticks.S */ 40 #define jiffies_64 jiffies /* XXX-MJ wrong on 32-bit platforms */ 41 #define jiffies_to_msecs(x) ((unsigned int)(((int64_t)(int)(x)) * 1000 / hz)) 42 #define jiffies64_to_msecs(x) (((uint64_t)(x)) * 1000 / hz) 43 44 #define MAX_JIFFY_OFFSET ((LONG_MAX >> 1) - 1) 45 46 #define time_after(a, b) ((long)((b) - (a)) < 0) 47 #define time_after32(a, b) ((int32_t)((uint32_t)(b) - (uint32_t)(a)) < 0) 48 #define time_before(a, b) time_after(b,a) 49 #define time_before32(a, b) time_after32(b, a) 50 #define time_after_eq(a, b) ((long)((a) - (b)) >= 0) 51 #define time_before_eq(a, b) time_after_eq(b, a) 52 #define time_in_range(a,b,c) \ 53 (time_after_eq(a,b) && time_before_eq(a,c)) 54 #define time_is_after_eq_jiffies(a) time_after_eq(a, jiffies) 55 #define time_is_after_jiffies(a) time_after(a, jiffies) 56 #define time_is_before_jiffies(a) time_before(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 unsigned long 73 msecs_to_jiffies(uint64_t msec) 74 { 75 uint64_t result; 76 77 if (msec > lkpi_msec2hz_max) 78 msec = lkpi_msec2hz_max; 79 result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div); 80 if (result > MAX_JIFFY_OFFSET) 81 result = MAX_JIFFY_OFFSET; 82 83 return ((unsigned long)result); 84 } 85 86 static inline unsigned long 87 usecs_to_jiffies(uint64_t usec) 88 { 89 uint64_t result; 90 91 if (usec > lkpi_usec2hz_max) 92 usec = lkpi_usec2hz_max; 93 result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div); 94 if (result > MAX_JIFFY_OFFSET) 95 result = MAX_JIFFY_OFFSET; 96 97 return ((unsigned long)result); 98 } 99 100 static inline uint64_t 101 nsecs_to_jiffies64(uint64_t nsec) 102 { 103 104 if (nsec > lkpi_nsec2hz_max) 105 nsec = lkpi_nsec2hz_max; 106 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 107 } 108 109 static inline unsigned long 110 nsecs_to_jiffies(uint64_t nsec) 111 { 112 113 if (sizeof(unsigned long) >= sizeof(uint64_t)) { 114 if (nsec > lkpi_nsec2hz_max) 115 nsec = lkpi_nsec2hz_max; 116 } else { 117 if (nsec > (lkpi_nsec2hz_max >> 32)) 118 nsec = (lkpi_nsec2hz_max >> 32); 119 } 120 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 121 } 122 123 static inline uint64_t 124 jiffies_to_nsecs(unsigned long j) 125 { 126 127 return ((1000000000ULL / hz) * (uint64_t)j); 128 } 129 130 static inline uint64_t 131 jiffies_to_usecs(unsigned long j) 132 { 133 134 return ((1000000ULL / hz) * (uint64_t)j); 135 } 136 137 static inline uint64_t 138 get_jiffies_64(void) 139 { 140 141 return ((uint64_t)jiffies); 142 } 143 144 #endif /* _LINUXKPI_LINUX_JIFFIES_H_ */ 145