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_one_jiffy               jiffies_to_cputime(1)
  46 #define cputime_max                     ((~0UL >> 1) - 1)
  47 #define cputime_add(__a, __b)           ((__a) +  (__b))
  48 #define cputime_sub(__a, __b)           ((__a) -  (__b))
  49 #define cputime_div(__a, __n) ({                \
  50         unsigned long long __div = (__a);       \
  51         do_div(__div,__n);                      \
  52         __div;                                  \
  53 })
  54 #define cputime_halve(__a)              ((__a) >> 1)
  55 #define cputime_eq(__a, __b)            ((__a) == (__b))
  56 #define cputime_gt(__a, __b)            ((__a) >  (__b))
  57 #define cputime_ge(__a, __b)            ((__a) >= (__b))
  58 #define cputime_lt(__a, __b)            ((__a) <  (__b))
  59 #define cputime_le(__a, __b)            ((__a) <= (__b))
  60 #define cputime_to_jiffies(__ct)        (__div((__ct), 4096000000ULL / HZ))
  61 #define cputime_to_scaled(__ct)         (__ct)
  62 #define jiffies_to_cputime(__hz)        ((cputime_t)(__hz) * (4096000000ULL / HZ))
  63
  64 #define cputime64_zero                  (0ULL)
  65 #define cputime64_add(__a, __b)         ((__a) + (__b))
  66 #define cputime_to_cputime64(__ct)      (__ct)
  67
  68 static inline u64
  69 cputime64_to_jiffies64(cputime64_t cputime)
  70 {
  71         do_div(cputime, 4096000000ULL / HZ);
  72         return cputime;
  73 }
  74
  75 /*
  76  * Convert cputime to microseconds and back.
  77  */
  78 static inline unsigned int
  79 cputime_to_usecs(const cputime_t cputime)
  80 {
  81         return cputime_div(cputime, 4096);
  82 }
  83
  84 static inline cputime_t
  85 usecs_to_cputime(const unsigned int m)
  86 {
  87         return (cputime_t) m * 4096;
  88 }
  89
  90 /*
  91  * Convert cputime to milliseconds and back.
  92  */
  93 static inline unsigned int
  94 cputime_to_secs(const cputime_t cputime)
  95 {
  96         return __div(cputime, 2048000000) >> 1;
  97 }
  98
  99 static inline cputime_t
 100 secs_to_cputime(const unsigned int s)
 101 {
 102         return (cputime_t) s * 4096000000ULL;
 103 }
 104
 105 /*
 106  * Convert cputime to timespec and back.
 107  */
 108 static inline cputime_t
 109 timespec_to_cputime(const struct timespec *value)
 110 {
 111         return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
 112 }
 113
 114 static inline void
 115 cputime_to_timespec(const cputime_t cputime, struct timespec *value)
 116 {
 117 #ifndef __s390x__
 118         register_pair rp;
 119
 120         rp.pair = cputime >> 1;
 121         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 122         value->tv_nsec = rp.subreg.even * 1000 / 4096;
 123         value->tv_sec = rp.subreg.odd;
 124 #else
 125         value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
 126         value->tv_sec = cputime / 4096000000ULL;
 127 #endif
 128 }
 129
 130 /*
 131  * Convert cputime to timeval and back.
 132  * Since cputime and timeval have the same resolution (microseconds)
 133  * this is easy.
 134  */
 135 static inline cputime_t
 136 timeval_to_cputime(const struct timeval *value)
 137 {
 138         return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
 139 }
 140
 141 static inline void
 142 cputime_to_timeval(const cputime_t cputime, struct timeval *value)
 143 {
 144 #ifndef __s390x__
 145         register_pair rp;
 146
 147         rp.pair = cputime >> 1;
 148         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 149         value->tv_usec = rp.subreg.even / 4096;
 150         value->tv_sec = rp.subreg.odd;
 151 #else
 152         value->tv_usec = (cputime % 4096000000ULL) / 4096;
 153         value->tv_sec = cputime / 4096000000ULL;
 154 #endif
 155 }
 156
 157 /*
 158  * Convert cputime to clock and back.
 159  */
 160 static inline clock_t
 161 cputime_to_clock_t(cputime_t cputime)
 162 {
 163         return cputime_div(cputime, 4096000000ULL / USER_HZ);
 164 }
 165
 166 static inline cputime_t
 167 clock_t_to_cputime(unsigned long x)
 168 {
 169         return (cputime_t) x * (4096000000ULL / USER_HZ);
 170 }
 171
 172 /*
 173  * Convert cputime64 to clock.
 174  */
 175 static inline clock_t
 176 cputime64_to_clock_t(cputime64_t cputime)
 177 {
 178        return cputime_div(cputime, 4096000000ULL / USER_HZ);
 179 }
 180
 181 struct s390_idle_data {
 182         unsigned int sequence;
 183         unsigned long long idle_count;
 184         unsigned long long idle_enter;
 185         unsigned long long idle_time;
 186         int nohz_delay;
 187 };
 188
 189 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
 190
 191 void vtime_start_cpu(__u64 int_clock, __u64 enter_timer);
 192 cputime64_t s390_get_idle_time(int cpu);
 193
 194 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
 195
 196 static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock,
 197                                    __u64 enter_timer)
 198 {
 199         if (regs->psw.mask & PSW_MASK_WAIT)
 200                 vtime_start_cpu(int_clock, enter_timer);
 201 }
 202
 203 static inline int s390_nohz_delay(int cpu)
 204 {
 205         return __get_cpu_var(s390_idle).nohz_delay != 0;
 206 }
 207
 208 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
 209
 210 #endif /* _S390_CPUTIME_H */