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36 * libcfs/include/libcfs/linux/linux-time.h
38 * Implementation of portable time API for Linux (kernel and user-level).
40 * Author: Nikita Danilov <nikita@clusterfs.com>
43 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
44 #define __LIBCFS_LINUX_LINUX_TIME_H__
46 #ifndef __LIBCFS_LIBCFS_H__
47 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
51 #error This include is only for kernel use.
54 /* Portable time API */
57 * Platform provides three opaque data-types:
59 * cfs_time_t represents point in time. This is internal kernel
60 * time rather than "wall clock". This time bears no
61 * relation to gettimeofday().
63 * cfs_duration_t represents time interval with resolution of internal
66 * cfs_time_t cfs_time_current(void);
67 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
68 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
69 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
70 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
72 * cfs_duration_t cfs_duration_build(int64_t);
74 * time_t cfs_duration_sec (cfs_duration_t);
75 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
76 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
83 #define ONE_BILLION ((u_int64_t)1000000000)
84 #define ONE_MILLION 1000000
87 #error This include is only for kernel use.
90 #include <linux/module.h>
91 #include <linux/kernel.h>
92 #include <linux/version.h>
93 #include <linux/time.h>
94 #include <asm/div64.h>
100 #include <linux/jiffies.h>
103 * Generic kernel stuff
106 typedef unsigned long cfs_time_t; /* jiffies */
107 typedef long cfs_duration_t;
108 typedef cycles_t cfs_cycles_t;
110 #define timespec64 timespec
111 #define ktime_get_real_ts64 ktime_get_real_ts
113 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
115 return time_before(t1, t2);
118 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
120 return time_before_eq(t1, t2);
123 static inline cfs_time_t cfs_time_current(void)
128 static inline time_t cfs_time_current_sec(void)
130 return get_seconds();
133 static inline cfs_duration_t cfs_time_seconds(int seconds)
136 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
139 static inline time_t cfs_duration_sec(cfs_duration_t d)
142 return d / msecs_to_jiffies(MSEC_PER_SEC);
145 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
147 #if (BITS_PER_LONG == 32)
148 if (msecs_to_jiffies(MSEC_PER_SEC) > 4096) {
151 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
152 t = (d - (cfs_duration_t)s->tv_sec *
153 msecs_to_jiffies(MSEC_PER_SEC)) * USEC_PER_SEC;
154 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
157 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
158 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
159 msecs_to_jiffies(MSEC_PER_SEC)) *
160 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
163 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
164 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
165 msecs_to_jiffies(MSEC_PER_SEC)) *
166 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
170 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
172 #if (BITS_PER_LONG == 32)
175 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
176 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
177 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
180 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
181 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
182 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
186 #define cfs_time_current_64 get_jiffies_64
188 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
193 static inline __u64 cfs_time_shift_64(int seconds)
195 return cfs_time_add_64(cfs_time_current_64(),
196 cfs_time_seconds(seconds));
199 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
201 return (__s64)t2 - (__s64)t1 > 0;
204 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
206 return (__s64)t2 - (__s64)t1 >= 0;
214 #define CFS_TIME_T "%lu"
215 #define CFS_DURATION_T "%ld"
218 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
221 * c-indentation-style: "K&R"