arch/s390/include/asm/cputime.h

   1 /*
   2  *  include/asm-s390/cputime.h
   3  *
   4  *  (C) Copyright IBM Corp. 2004
   5  *
   6  *  Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  */
   8
   9 #ifndef _S390_CPUTIME_H
  10 #define _S390_CPUTIME_H
  11
  12 #include <linux/types.h>
  13 #include <linux/percpu.h>
  14 #include <linux/spinlock.h>
  15 #include <asm/div64.h>
  16
  17 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
  18
  19 typedef unsigned long long cputime_t;
  20 typedef unsigned long long cputime64_t;
  21
  22 #ifndef __s390x__
  23
  24 static inline unsigned int
  25 __div(unsigned long long n, unsigned int base)
  26 {
  27         register_pair rp;
  28
  29         rp.pair = n >> 1;
  30         asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
  31         return rp.subreg.odd;
  32 }
  33
  34 #else /* __s390x__ */
  35
  36 static inline unsigned int
  37 __div(unsigned long long n, unsigned int base)
  38 {
  39         return n / base;
  40 }
  41
  42 #endif /* __s390x__ */
  43
  44 #define cputime_zero                    (0ULL)
  45 #define cputime_max                     ((~0UL >> 1) - 1)
  46 #define cputime_add(__a, __b)           ((__a) +  (__b))
  47 #define cputime_sub(__a, __b)           ((__a) -  (__b))
  48 #define cputime_div(__a, __n) ({                \
  49         unsigned long long __div = (__a);       \
  50         do_div(__div,__n);                      \
  51         __div;                                  \
  52 })
  53 #define cputime_halve(__a)              ((__a) >> 1)
  54 #define cputime_eq(__a, __b)            ((__a) == (__b))
  55 #define cputime_gt(__a, __b)            ((__a) >  (__b))
  56 #define cputime_ge(__a, __b)            ((__a) >= (__b))
  57 #define cputime_lt(__a, __b)            ((__a) <  (__b))
  58 #define cputime_le(__a, __b)            ((__a) <= (__b))
  59 #define cputime_to_jiffies(__ct)        (__div((__ct), 4096000000ULL / HZ))
  60 #define cputime_to_scaled(__ct)         (__ct)
  61 #define jiffies_to_cputime(__hz)        ((cputime_t)(__hz) * (4096000000ULL / HZ))
  62
  63 #define cputime64_zero                  (0ULL)
  64 #define cputime64_add(__a, __b)         ((__a) + (__b))
  65 #define cputime_to_cputime64(__ct)      (__ct)
  66
  67 static inline u64
  68 cputime64_to_jiffies64(cputime64_t cputime)
  69 {
  70         do_div(cputime, 4096000000ULL / HZ);
  71         return cputime;
  72 }
  73
  74 /*
  75  * Convert cputime to milliseconds and back.
  76  */
  77 static inline unsigned int
  78 cputime_to_msecs(const cputime_t cputime)
  79 {
  80         return __div(cputime, 4096000);
  81 }
  82
  83 static inline cputime_t
  84 msecs_to_cputime(const unsigned int m)
  85 {
  86         return (cputime_t) m * 4096000;
  87 }
  88
  89 /*
  90  * Convert cputime to milliseconds and back.
  91  */
  92 static inline unsigned int
  93 cputime_to_secs(const cputime_t cputime)
  94 {
  95         return __div(cputime, 2048000000) >> 1;
  96 }
  97
  98 static inline cputime_t
  99 secs_to_cputime(const unsigned int s)
 100 {
 101         return (cputime_t) s * 4096000000ULL;
 102 }
 103
 104 /*
 105  * Convert cputime to timespec and back.
 106  */
 107 static inline cputime_t
 108 timespec_to_cputime(const struct timespec *value)
 109 {
 110         return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
 111 }
 112
 113 static inline void
 114 cputime_to_timespec(const cputime_t cputime, struct timespec *value)
 115 {
 116 #ifndef __s390x__
 117         register_pair rp;
 118
 119         rp.pair = cputime >> 1;
 120         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 121         value->tv_nsec = rp.subreg.even * 1000 / 4096;
 122         value->tv_sec = rp.subreg.odd;
 123 #else
 124         value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
 125         value->tv_sec = cputime / 4096000000ULL;
 126 #endif
 127 }
 128
 129 /*
 130  * Convert cputime to timeval and back.
 131  * Since cputime and timeval have the same resolution (microseconds)
 132  * this is easy.
 133  */
 134 static inline cputime_t
 135 timeval_to_cputime(const struct timeval *value)
 136 {
 137         return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
 138 }
 139
 140 static inline void
 141 cputime_to_timeval(const cputime_t cputime, struct timeval *value)
 142 {
 143 #ifndef __s390x__
 144         register_pair rp;
 145
 146         rp.pair = cputime >> 1;
 147         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 148         value->tv_usec = rp.subreg.even / 4096;
 149         value->tv_sec = rp.subreg.odd;
 150 #else
 151         value->tv_usec = (cputime % 4096000000ULL) / 4096;
 152         value->tv_sec = cputime / 4096000000ULL;
 153 #endif
 154 }
 155
 156 /*
 157  * Convert cputime to clock and back.
 158  */
 159 static inline clock_t
 160 cputime_to_clock_t(cputime_t cputime)
 161 {
 162         return __div(cputime, 4096000000ULL / USER_HZ);
 163 }
 164
 165 static inline cputime_t
 166 clock_t_to_cputime(unsigned long x)
 167 {
 168         return (cputime_t) x * (4096000000ULL / USER_HZ);
 169 }
 170
 171 /*
 172  * Convert cputime64 to clock.
 173  */
 174 static inline clock_t
 175 cputime64_to_clock_t(cputime64_t cputime)
 176 {
 177        return __div(cputime, 4096000000ULL / USER_HZ);
 178 }
 179
 180 struct s390_idle_data {
 181         unsigned int sequence;
 182         unsigned long long idle_count;
 183         unsigned long long idle_enter;
 184         unsigned long long idle_time;
 185 };
 186
 187 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
 188
 189 void vtime_start_cpu(void);
 190 cputime64_t s390_get_idle_time(int cpu);
 191
 192 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
 193
 194 static inline void s390_idle_check(void)
 195 {
 196         if ((&__get_cpu_var(s390_idle))->idle_enter != 0ULL)
 197                 vtime_start_cpu();
 198 }
 199
 200 #endif /* _S390_CPUTIME_H */