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 43 #define MAX_JIFFY_OFFSET ((LONG_MAX >> 1) - 1) 44 45 #define time_after(a, b) ((long)((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) ((long)((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 #define time_is_before_jiffies(a) time_before(a, jiffies) 56 57 #define HZ hz 58 59 extern uint64_t lkpi_nsec2hz_rem; 60 extern uint64_t lkpi_nsec2hz_div; 61 extern uint64_t lkpi_nsec2hz_max; 62 63 extern uint64_t lkpi_usec2hz_rem; 64 extern uint64_t lkpi_usec2hz_div; 65 extern uint64_t lkpi_usec2hz_max; 66 67 extern uint64_t lkpi_msec2hz_rem; 68 extern uint64_t lkpi_msec2hz_div; 69 extern uint64_t lkpi_msec2hz_max; 70 71 static inline unsigned long 72 msecs_to_jiffies(uint64_t msec) 73 { 74 uint64_t result; 75 76 if (msec > lkpi_msec2hz_max) 77 msec = lkpi_msec2hz_max; 78 result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div); 79 if (result > MAX_JIFFY_OFFSET) 80 result = MAX_JIFFY_OFFSET; 81 82 return ((unsigned long)result); 83 } 84 85 static inline unsigned long 86 usecs_to_jiffies(uint64_t usec) 87 { 88 uint64_t result; 89 90 if (usec > lkpi_usec2hz_max) 91 usec = lkpi_usec2hz_max; 92 result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div); 93 if (result > MAX_JIFFY_OFFSET) 94 result = MAX_JIFFY_OFFSET; 95 96 return ((unsigned long)result); 97 } 98 99 static inline uint64_t 100 nsecs_to_jiffies64(uint64_t nsec) 101 { 102 103 if (nsec > lkpi_nsec2hz_max) 104 nsec = lkpi_nsec2hz_max; 105 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 106 } 107 108 static inline unsigned long 109 nsecs_to_jiffies(uint64_t nsec) 110 { 111 112 if (sizeof(unsigned long) >= sizeof(uint64_t)) { 113 if (nsec > lkpi_nsec2hz_max) 114 nsec = lkpi_nsec2hz_max; 115 } else { 116 if (nsec > (lkpi_nsec2hz_max >> 32)) 117 nsec = (lkpi_nsec2hz_max >> 32); 118 } 119 return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div)); 120 } 121 122 static inline uint64_t 123 jiffies_to_nsecs(unsigned long j) 124 { 125 126 return ((1000000000ULL / hz) * (uint64_t)j); 127 } 128 129 static inline uint64_t 130 jiffies_to_usecs(unsigned long j) 131 { 132 133 return ((1000000ULL / hz) * (uint64_t)j); 134 } 135 136 static inline uint64_t 137 get_jiffies_64(void) 138 { 139 140 return ((uint64_t)jiffies); 141 } 142 143 #endif /* _LINUXKPI_LINUX_JIFFIES_H_ */ 144