4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * libcfs/include/libcfs/linux/linux-time.h
34 * Implementation of portable time API for Linux (kernel and user-level).
36 * Author: Nikita Danilov <nikita@clusterfs.com>
39 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
40 #define __LIBCFS_LINUX_LINUX_TIME_H__
42 #ifndef __LIBCFS_LIBCFS_H__
43 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
47 #error This include is only for kernel use.
50 /* Portable time API */
53 * Platform provides three opaque data-types:
55 * cfs_time_t represents point in time. This is internal kernel
56 * time rather than "wall clock". This time bears no
57 * relation to gettimeofday().
59 * cfs_duration_t represents time interval with resolution of internal
62 * cfs_time_t cfs_time_current(void);
63 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
64 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
65 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
66 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
68 * cfs_duration_t cfs_duration_build(int64_t);
70 * time_t cfs_duration_sec (cfs_duration_t);
71 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
72 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
79 #define ONE_BILLION ((u_int64_t)1000000000)
80 #define ONE_MILLION 1000000
83 #error This include is only for kernel use.
86 #include <linux/module.h>
87 #include <linux/kernel.h>
88 #include <linux/version.h>
89 #include <linux/jiffies.h>
90 #include <linux/types.h>
91 #include <linux/time.h>
92 #include <asm/div64.h>
95 * Generic kernel stuff
98 typedef unsigned long cfs_time_t; /* jiffies */
99 typedef long cfs_duration_t;
101 #ifndef HAVE_TIMESPEC64
103 typedef __s64 time64_t;
105 #if __BITS_PER_LONG == 64
107 # define timespec64 timespec
109 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
116 time64_t tv_sec; /* seconds */
117 long tv_nsec; /* nanoseconds */
120 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
122 struct timespec64 ret;
124 ret.tv_sec = ts.tv_sec;
125 ret.tv_nsec = ts.tv_nsec;
128 #endif /* __BITS_PER_LONG != 64 */
130 #endif /* HAVE_TIMESPEC64 */
132 #ifndef HAVE_KTIME_ADD
133 # define ktime_add(lhs, rhs) ({ (ktime_t){ .tv64 = (lhs).tv64 + (rhs).tv64 }; })
134 #endif /* !HAVE_KTIME_ADD */
136 #ifndef HAVE_KTIME_AFTER
137 static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
139 return cmp1.tv64 > cmp2.tv64;
141 #endif /* !HAVE_KTIME_AFTER */
143 #ifndef HAVE_KTIME_GET_TS64
144 void ktime_get_ts64(struct timespec64 *ts);
145 #endif /* HAVE_KTIME_GET_TS */
147 #ifndef HAVE_KTIME_GET_REAL_TS64
148 void ktime_get_real_ts64(struct timespec64 *ts);
149 #endif /* HAVE_KTIME_GET_REAL_TS */
151 #ifndef HAVE_KTIME_GET_REAL_SECONDS
152 time64_t ktime_get_real_seconds(void);
153 #endif /* HAVE_KTIME_GET_REAL_SECONDS */
155 #ifndef HAVE_KTIME_GET_SECONDS
156 time64_t ktime_get_seconds(void);
157 #endif /* HAVE_KTIME_GET_SECONDS */
159 #ifdef NEED_KTIME_GET_REAL_NS
160 static inline u64 ktime_get_real_ns(void)
162 return ktime_to_ns(ktime_get_real());
164 #endif /* NEED_KTIME_GET_REAL_NS */
166 #ifndef HAVE_KTIME_TO_TIMESPEC64
167 static inline struct timespec64 ktime_to_timespec64(ktime_t kt)
169 struct timespec ts = ns_to_timespec((kt).tv64);
171 return timespec_to_timespec64(ts);
173 #endif /* HAVE_KTIME_TO_TIMESPEC64 */
175 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
177 return time_before(t1, t2);
180 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
182 return time_before_eq(t1, t2);
185 static inline cfs_time_t cfs_time_current(void)
190 static inline time_t cfs_time_current_sec(void)
192 return get_seconds();
195 static inline cfs_duration_t cfs_time_seconds(int seconds)
198 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
201 static inline time_t cfs_duration_sec(cfs_duration_t d)
204 return d / msecs_to_jiffies(MSEC_PER_SEC);
207 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
209 #if (BITS_PER_LONG == 32)
210 if (msecs_to_jiffies(MSEC_PER_SEC) > 4096) {
213 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
214 t = (d - (cfs_duration_t)s->tv_sec *
215 msecs_to_jiffies(MSEC_PER_SEC)) * USEC_PER_SEC;
216 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
219 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
220 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
221 msecs_to_jiffies(MSEC_PER_SEC)) *
222 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
225 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
226 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
227 msecs_to_jiffies(MSEC_PER_SEC)) *
228 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
232 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
234 #if (BITS_PER_LONG == 32)
237 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
238 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
239 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
242 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
243 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
244 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
248 #define cfs_time_current_64 get_jiffies_64
250 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
255 static inline __u64 cfs_time_shift_64(int seconds)
257 return cfs_time_add_64(cfs_time_current_64(),
258 cfs_time_seconds(seconds));
261 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
263 return (__s64)t2 - (__s64)t1 > 0;
266 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
268 return (__s64)t2 - (__s64)t1 >= 0;
274 #define CFS_TIME_T "%lu"
275 #define CFS_DURATION_T "%ld"
278 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
281 * c-indentation-style: "K&R"