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
  18 typedef unsigned long long __nocast cputime_t;
  19 typedef unsigned long long __nocast cputime64_t;
  20
  21 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
  22
  23 static 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  */
  33 static 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
  38 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
  39 {
  40         return (__force cputime_t)(jif * (CPUTIME_PER_SEC / HZ));
  41 }
  42
  43 static 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
  50 static 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  */
  58 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  59 {
  60         return (__force unsigned long long) cputime >> 12;
  61 }
  62
  63 static 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  */
  73 static 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
  78 static 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  */
  86 static 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
  92 static 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  */
 105 static 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
 111 static 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  */
 122 static 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
 129 static 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  */
 137 static 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
 144 cputime64_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 */