arch/s390/include/asm/cputime.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Copyright IBM Corp. 2004
   4  *
   5  *  Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  */
   7
   8 #ifndef _S390_CPUTIME_H
   9 #define _S390_CPUTIME_H
  10
  11 #include <linux/types.h>
  12 #include <asm/timex.h>
  13
  14 #define CPUTIME_PER_USEC 4096ULL
  15 #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC)
  16
  17 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
  18
  19 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
  20
  21 /*
  22  * Convert cputime to microseconds.
  23  */
  24 static inline u64 cputime_to_usecs(const u64 cputime)
  25 {
  26         return cputime >> 12;
  27 }
  28
  29 /*
  30  * Convert cputime to nanoseconds.
  31  */
  32 #define cputime_to_nsecs(cputime) tod_to_ns(cputime)
  33
  34 u64 arch_cpu_idle_time(int cpu);
  35
  36 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
  37
  38 #endif /* _S390_CPUTIME_H */