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

   1 /*
   2  * Copyright (c) 2015 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_TIMEKEEPING_H_
  28 #define _LINUX_TIMEKEEPING_H_
  29
  30 static inline u64 ktime_get_raw_ns(void)
  31 {
  32         struct timespec ts;
  33
  34         nanouptime(&ts);
  35
  36         return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
  37 }
  38
  39 static inline ktime_t ktime_mono_to_real(ktime_t mono)
  40 {
  41         return mono;
  42 }
  43
  44 static inline ktime_t ktime_get_real(void)
  45 {
  46         ktime_t kt;
  47
  48         kt.tv64 = ktime_get_raw_ns();
  49         return kt;
  50 }
  51
  52 #endif  /* _LINUX_TIMEKEEPING_H_ */