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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;
100 typedef cycles_t cfs_cycles_t;
102 #ifndef HAVE_TIMESPEC64
104 typedef __s64 time64_t;
106 #if __BITS_PER_LONG == 64
108 # define timespec64 timespec
110 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
117 time64_t tv_sec; /* seconds */
118 long tv_nsec; /* nanoseconds */
121 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
123 struct timespec64 ret;
125 ret.tv_sec = ts.tv_sec;
126 ret.tv_nsec = ts.tv_nsec;
129 #endif /* __BITS_PER_LONG != 64 */
131 #endif /* HAVE_TIMESPEC64 */
133 #ifndef HAVE_KTIME_GET_REAL_TS64
134 void ktime_get_real_ts64(struct timespec64 *ts);
135 #endif /* HAVE_KTIME_GET_REAL_TS */
137 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
139 return time_before(t1, t2);
142 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
144 return time_before_eq(t1, t2);
147 static inline cfs_time_t cfs_time_current(void)
152 static inline time_t cfs_time_current_sec(void)
154 return get_seconds();
157 static inline cfs_duration_t cfs_time_seconds(int seconds)
160 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
163 static inline time_t cfs_duration_sec(cfs_duration_t d)
166 return d / msecs_to_jiffies(MSEC_PER_SEC);
169 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
171 #if (BITS_PER_LONG == 32)
172 if (msecs_to_jiffies(MSEC_PER_SEC) > 4096) {
175 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
176 t = (d - (cfs_duration_t)s->tv_sec *
177 msecs_to_jiffies(MSEC_PER_SEC)) * USEC_PER_SEC;
178 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
181 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
182 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
183 msecs_to_jiffies(MSEC_PER_SEC)) *
184 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
187 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
188 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
189 msecs_to_jiffies(MSEC_PER_SEC)) *
190 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
194 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
196 #if (BITS_PER_LONG == 32)
199 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
200 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
201 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
204 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
205 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
206 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
210 #define cfs_time_current_64 get_jiffies_64
212 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
217 static inline __u64 cfs_time_shift_64(int seconds)
219 return cfs_time_add_64(cfs_time_current_64(),
220 cfs_time_seconds(seconds));
223 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
225 return (__s64)t2 - (__s64)t1 > 0;
228 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
230 return (__s64)t2 - (__s64)t1 >= 0;
236 #define CFS_TIME_T "%lu"
237 #define CFS_DURATION_T "%ld"
240 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
243 * c-indentation-style: "K&R"