sys/dev/drm/include/linux/ktime.h

   1 /*
   2  * Copyright (c) 2015-2016 François Tigeot
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_KTIME_H_
  28 #define _LINUX_KTIME_H_
  29
  30 #include <linux/time.h>
  31 #include <linux/jiffies.h>
  32
  33 /* time values in nanoseconds */
  34 union ktime {
  35         int64_t tv64;
  36 };
  37
  38 typedef union ktime ktime_t;
  39
  40 static inline s64
  41 ktime_to_us(const ktime_t kt)
  42 {
  43         return kt.tv64 / NSEC_PER_USEC;
  44 }
  45
  46 static inline s64
  47 ktime_us_delta(const ktime_t later, const ktime_t earlier)
  48 {
  49         return later.tv64 - earlier.tv64;
  50 }
  51
  52 static inline int64_t ktime_to_ns(ktime_t kt)
  53 {
  54         return kt.tv64;
  55 }
  56
  57 static inline struct timeval ktime_to_timeval(ktime_t kt)
  58 {
  59         return ns_to_timeval(kt.tv64);
  60 }
  61
  62 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns)
  63 {
  64         ktime_t res;
  65
  66         res.tv64 = kt.tv64 + ns;
  67         return kt;
  68 }
  69
  70 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns)
  71 {
  72         ktime_t res;
  73
  74         res.tv64 = kt.tv64 - ns;
  75         return kt;
  76 }
  77
  78 static inline ktime_t ktime_get(void)
  79 {
  80         struct timespec ts;
  81         ktime_t kt;
  82
  83         nanouptime(&ts);
  84         kt.tv64 = (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
  85         return kt;
  86 }
  87
  88 #include <linux/timekeeping.h>
  89
  90 #endif  /* _LINUX_KTIME_H_ */