LXR linux/arch/s390/include/asm/cputime.h

   1/*
   2 *  Copyright IBM Corp. 2004
   3 *
   4 *  Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
   5 */
   6
   7#ifndef _S390_CPUTIME_H
   8#define _S390_CPUTIME_H
   9
  10#include <linux/types.h>
  11#include <asm/div64.h>
  12
  13#define CPUTIME_PER_USEC 4096ULL
  14#define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC)
  15
  16/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
  17
  18typedef unsigned long long __nocast cputime_t;
  19typedef unsigned long long __nocast cputime64_t;
  20
  21#define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
  22
  23static inline unsigned long __div(unsigned long long n, unsigned long base)
  24{
  25        return n / base;
  26}
  27
  28#define cputime_one_jiffy               jiffies_to_cputime(1)
  29
  30/*
  31 * Convert cputime to jiffies and back.
  32 */
  33static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
  34{
  35        return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / HZ);
  36}
  37
  38static inline cputime_t jiffies_to_cputime(const unsigned int jif)
  39{
  40        return (__force cputime_t)(jif * (CPUTIME_PER_SEC / HZ));
  41}
  42
  43static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
  44{
  45        unsigned long long jif = (__force unsigned long long) cputime;
  46        do_div(jif, CPUTIME_PER_SEC / HZ);
  47        return jif;
  48}
  49
  50static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  51{
  52        return (__force cputime64_t)(jif * (CPUTIME_PER_SEC / HZ));
  53}
  54
  55/*
  56 * Convert cputime to microseconds and back.
  57 */
  58static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  59{
  60        return (__force unsigned long long) cputime >> 12;
  61}
  62
  63static inline cputime_t usecs_to_cputime(const unsigned int m)
  64{
  65        return (__force cputime_t)(m * CPUTIME_PER_USEC);
  66}
  67
  68#define usecs_to_cputime64(m)           usecs_to_cputime(m)
  69
  70/*
  71 * Convert cputime to milliseconds and back.
  72 */
  73static inline unsigned int cputime_to_secs(const cputime_t cputime)
  74{
  75        return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / 2) >> 1;
  76}
  77
  78static inline cputime_t secs_to_cputime(const unsigned int s)
  79{
  80        return (__force cputime_t)(s * CPUTIME_PER_SEC);
  81}
  82
  83/*
  84 * Convert cputime to timespec and back.
  85 */
  86static inline cputime_t timespec_to_cputime(const struct timespec *value)
  87{
  88        unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC;
  89        return (__force cputime_t)(ret + __div(value->tv_nsec * CPUTIME_PER_USEC, NSEC_PER_USEC));
  90}
  91
  92static inline void cputime_to_timespec(const cputime_t cputime,
  93                                       struct timespec *value)
  94{
  95        unsigned long long __cputime = (__force unsigned long long) cputime;
  96        value->tv_nsec = (__cputime % CPUTIME_PER_SEC) * NSEC_PER_USEC / CPUTIME_PER_USEC;
  97        value->tv_sec = __cputime / CPUTIME_PER_SEC;
  98}
  99
 100/*
 101 * Convert cputime to timeval and back.
 102 * Since cputime and timeval have the same resolution (microseconds)
 103 * this is easy.
 104 */
 105static inline cputime_t timeval_to_cputime(const struct timeval *value)
 106{
 107        unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC;
 108        return (__force cputime_t)(ret + value->tv_usec * CPUTIME_PER_USEC);
 109}
 110
 111static inline void cputime_to_timeval(const cputime_t cputime,
 112                                      struct timeval *value)
 113{
 114        unsigned long long __cputime = (__force unsigned long long) cputime;
 115        value->tv_usec = (__cputime % CPUTIME_PER_SEC) / CPUTIME_PER_USEC;
 116        value->tv_sec = __cputime / CPUTIME_PER_SEC;
 117}
 118
 119/*
 120 * Convert cputime to clock and back.
 121 */
 122static inline clock_t cputime_to_clock_t(cputime_t cputime)
 123{
 124        unsigned long long clock = (__force unsigned long long) cputime;
 125        do_div(clock, CPUTIME_PER_SEC / USER_HZ);
 126        return clock;
 127}
 128
 129static inline cputime_t clock_t_to_cputime(unsigned long x)
 130{
 131        return (__force cputime_t)(x * (CPUTIME_PER_SEC / USER_HZ));
 132}
 133
 134/*
 135 * Convert cputime64 to clock.
 136 */
 137static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 138{
 139        unsigned long long clock = (__force unsigned long long) cputime;
 140        do_div(clock, CPUTIME_PER_SEC / USER_HZ);
 141        return clock;
 142}
 143
 144cputime64_t arch_cpu_idle_time(int cpu);
 145
 146#define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
 147
 148#endif /* _S390_CPUTIME_H */
 149