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14 * in the LICENSE file that accompanied this code).
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26 * Copyright (c) 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
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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)
114 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts)
121 time64_t tv_sec; /* seconds */
122 long tv_nsec; /* nanoseconds */
125 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
127 struct timespec64 ret;
129 ret.tv_sec = ts.tv_sec;
130 ret.tv_nsec = ts.tv_nsec;
134 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
138 ret.tv_sec = (time_t)ts64.tv_sec;
139 ret.tv_nsec = ts64.tv_nsec;
142 #endif /* __BITS_PER_LONG != 64 */
144 #endif /* HAVE_TIMESPEC64 */
146 #ifndef HAVE_KTIME_ADD
147 # define ktime_add(lhs, rhs) ({ (ktime_t){ .tv64 = (lhs).tv64 + (rhs).tv64 }; })
148 #endif /* !HAVE_KTIME_ADD */
150 #ifndef HAVE_KTIME_AFTER
151 static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
153 return cmp1.tv64 > cmp2.tv64;
155 #endif /* !HAVE_KTIME_AFTER */
157 #ifndef HAVE_KTIME_GET_TS64
158 void ktime_get_ts64(struct timespec64 *ts);
159 #endif /* HAVE_KTIME_GET_TS */
161 #ifndef HAVE_KTIME_GET_REAL_TS64
162 void ktime_get_real_ts64(struct timespec64 *ts);
163 #endif /* HAVE_KTIME_GET_REAL_TS */
165 #ifndef HAVE_KTIME_GET_REAL_SECONDS
166 time64_t ktime_get_real_seconds(void);
167 #endif /* HAVE_KTIME_GET_REAL_SECONDS */
169 #ifndef HAVE_KTIME_GET_SECONDS
170 time64_t ktime_get_seconds(void);
171 #endif /* HAVE_KTIME_GET_SECONDS */
173 #ifdef NEED_KTIME_GET_REAL_NS
174 static inline u64 ktime_get_real_ns(void)
176 return ktime_to_ns(ktime_get_real());
178 #endif /* NEED_KTIME_GET_REAL_NS */
180 #ifndef HAVE_KTIME_TO_TIMESPEC64
181 static inline struct timespec64 ktime_to_timespec64(ktime_t kt)
183 struct timespec ts = ns_to_timespec((kt).tv64);
185 return timespec_to_timespec64(ts);
187 #endif /* HAVE_KTIME_TO_TIMESPEC64 */
189 #ifndef HAVE_TIMESPEC64_SUB
190 static inline struct timespec64
191 timespec64_sub(struct timespec64 later, struct timespec64 earlier)
193 struct timespec diff;
195 diff = timespec_sub(timespec64_to_timespec(later),
196 timespec64_to_timespec(earlier));
197 return timespec_to_timespec64(diff);
201 #ifndef HAVE_TIMESPEC64_TO_KTIME
202 static inline ktime_t timespec64_to_ktime(struct timespec64 ts)
204 return ktime_set(ts.tv_sec, ts.tv_nsec);
208 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
210 return time_before(t1, t2);
213 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
215 return time_before_eq(t1, t2);
218 static inline cfs_time_t cfs_time_current(void)
223 static inline time_t cfs_time_current_sec(void)
225 return get_seconds();
228 static inline cfs_duration_t cfs_time_seconds(int seconds)
231 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
234 static inline time_t cfs_duration_sec(cfs_duration_t d)
237 return d / msecs_to_jiffies(MSEC_PER_SEC);
240 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
242 #if (BITS_PER_LONG == 32)
245 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
246 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
247 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
250 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
251 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
252 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
256 #define cfs_time_current_64 get_jiffies_64
258 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
263 static inline __u64 cfs_time_shift_64(int seconds)
265 return cfs_time_add_64(cfs_time_current_64(),
266 cfs_time_seconds(seconds));
269 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
271 return (__s64)t2 - (__s64)t1 > 0;
274 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
276 return (__s64)t2 - (__s64)t1 >= 0;
282 #define CFS_DURATION_T "%ld"
285 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
288 * c-indentation-style: "K&R"