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

   1 /*
   2  * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
   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 typedef s64     ktime_t;
  35
  36 static inline ktime_t
  37 ktime_set(const s64 secs, const unsigned long nsecs)
  38 {
  39         return (secs * NSEC_PER_SEC) + (s64)nsecs;
  40 }
  41
  42 static inline s64
  43 ktime_to_us(const ktime_t kt)
  44 {
  45         return kt / NSEC_PER_USEC;
  46 }
  47
  48 static inline s64
  49 ktime_us_delta(const ktime_t later, const ktime_t earlier)
  50 {
  51         return later - earlier;
  52 }
  53
  54 static inline int64_t ktime_to_ns(ktime_t kt)
  55 {
  56         return kt;
  57 }
  58
  59 static inline struct timeval ktime_to_timeval(ktime_t kt)
  60 {
  61         return ns_to_timeval(kt);
  62 }
  63
  64 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns)
  65 {
  66         return kt + ns;
  67 }
  68
  69 static inline ktime_t
  70 ktime_add_ms(const ktime_t kt, const u64 ms)
  71 {
  72         return ktime_add_ns(kt, NSEC_PER_MSEC * ms);
  73 }
  74
  75 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns)
  76 {
  77         return kt - ns;
  78 }
  79
  80 static inline ktime_t ktime_get(void)
  81 {
  82         struct timespec ts;
  83
  84         nanouptime(&ts);
  85         return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
  86 }
  87
  88 static inline ktime_t
  89 ktime_sub(ktime_t lhs, ktime_t rhs)
  90 {
  91         return lhs - rhs;
  92 }
  93
  94 static inline ktime_t
  95 ns_to_ktime(u64 ns)
  96 {
  97         return ns;
  98 }
  99
 100 static inline bool
 101 ktime_before(const ktime_t cmp1, const ktime_t cmp2)
 102 {
 103         return (cmp1 < cmp2);
 104 }
 105
 106 static inline bool
 107 ktime_after(const ktime_t cmp1, const ktime_t cmp2)
 108 {
 109         return (cmp1 > cmp2);
 110 }
 111
 112 #define ktime_to_timespec64(kt)         ns_to_timespec((kt))
 113
 114 #include <linux/timekeeping.h>
 115
 116 #endif  /* _LINUX_KTIME_H_ */