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 __nocast cputime_t;
  20 typedef unsigned long long __nocast cputime64_t;
  21
  22 static inline unsigned long __div(unsigned long long n, unsigned long base)
  23 {
  24 #ifndef __s390x__
  25         register_pair rp;
  26
  27         rp.pair = n >> 1;
  28         asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
  29         return rp.subreg.odd;
  30 #else /* __s390x__ */
  31         return n / base;
  32 #endif /* __s390x__ */
  33 }
  34
  35 #define cputime_one_jiffy               jiffies_to_cputime(1)
  36
  37 /*
  38  * Convert cputime to jiffies and back.
  39  */
  40 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
  41 {
  42         return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
  43 }
  44
  45 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
  46 {
  47         return (__force cputime_t)(jif * (4096000000ULL / HZ));
  48 }
  49
  50 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
  51 {
  52         unsigned long long jif = (__force unsigned long long) cputime;
  53         do_div(jif, 4096000000ULL / HZ);
  54         return jif;
  55 }
  56
  57 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  58 {
  59         return (__force cputime64_t)(jif * (4096000000ULL / HZ));
  60 }
  61
  62 /*
  63  * Convert cputime to microseconds and back.
  64  */
  65 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  66 {
  67         return (__force unsigned long long) cputime >> 12;
  68 }
  69
  70 static inline cputime_t usecs_to_cputime(const unsigned int m)
  71 {
  72         return (__force cputime_t)(m * 4096ULL);
  73 }
  74
  75 #define usecs_to_cputime64(m)           usecs_to_cputime(m)
  76
  77 /*
  78  * Convert cputime to milliseconds and back.
  79  */
  80 static inline unsigned int cputime_to_secs(const cputime_t cputime)
  81 {
  82         return __div((__force unsigned long long) cputime, 2048000000) >> 1;
  83 }
  84
  85 static inline cputime_t secs_to_cputime(const unsigned int s)
  86 {
  87         return (__force cputime_t)(s * 4096000000ULL);
  88 }
  89
  90 /*
  91  * Convert cputime to timespec and back.
  92  */
  93 static inline cputime_t timespec_to_cputime(const struct timespec *value)
  94 {
  95         unsigned long long ret = value->tv_sec * 4096000000ULL;
  96         return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
  97 }
  98
  99 static inline void cputime_to_timespec(const cputime_t cputime,
 100                                        struct timespec *value)
 101 {
 102         unsigned long long __cputime = (__force unsigned long long) cputime;
 103 #ifndef __s390x__
 104         register_pair rp;
 105
 106         rp.pair = __cputime >> 1;
 107         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 108         value->tv_nsec = rp.subreg.even * 1000 / 4096;
 109         value->tv_sec = rp.subreg.odd;
 110 #else
 111         value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
 112         value->tv_sec = __cputime / 4096000000ULL;
 113 #endif
 114 }
 115
 116 /*
 117  * Convert cputime to timeval and back.
 118  * Since cputime and timeval have the same resolution (microseconds)
 119  * this is easy.
 120  */
 121 static inline cputime_t timeval_to_cputime(const struct timeval *value)
 122 {
 123         unsigned long long ret = value->tv_sec * 4096000000ULL;
 124         return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
 125 }
 126
 127 static inline void cputime_to_timeval(const cputime_t cputime,
 128                                       struct timeval *value)
 129 {
 130         unsigned long long __cputime = (__force unsigned long long) cputime;
 131 #ifndef __s390x__
 132         register_pair rp;
 133
 134         rp.pair = __cputime >> 1;
 135         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 136         value->tv_usec = rp.subreg.even / 4096;
 137         value->tv_sec = rp.subreg.odd;
 138 #else
 139         value->tv_usec = (__cputime % 4096000000ULL) / 4096;
 140         value->tv_sec = __cputime / 4096000000ULL;
 141 #endif
 142 }
 143
 144 /*
 145  * Convert cputime to clock and back.
 146  */
 147 static inline clock_t cputime_to_clock_t(cputime_t cputime)
 148 {
 149         unsigned long long clock = (__force unsigned long long) cputime;
 150         do_div(clock, 4096000000ULL / USER_HZ);
 151         return clock;
 152 }
 153
 154 static inline cputime_t clock_t_to_cputime(unsigned long x)
 155 {
 156         return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
 157 }
 158
 159 /*
 160  * Convert cputime64 to clock.
 161  */
 162 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 163 {
 164         unsigned long long clock = (__force unsigned long long) cputime;
 165         do_div(clock, 4096000000ULL / USER_HZ);
 166         return clock;
 167 }
 168
 169 struct s390_idle_data {
 170         unsigned int sequence;
 171         unsigned long long idle_count;
 172         unsigned long long idle_enter;
 173         unsigned long long idle_time;
 174         int nohz_delay;
 175 };
 176
 177 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
 178
 179 void vtime_start_cpu(__u64 int_clock, __u64 enter_timer);
 180 cputime64_t s390_get_idle_time(int cpu);
 181
 182 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
 183
 184 static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock,
 185                                    __u64 enter_timer)
 186 {
 187         if (regs->psw.mask & PSW_MASK_WAIT)
 188                 vtime_start_cpu(int_clock, enter_timer);
 189 }
 190
 191 static inline int s390_nohz_delay(int cpu)
 192 {
 193         return __get_cpu_var(s390_idle).nohz_delay != 0;
 194 }
 195
 196 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
 197
 198 #endif /* _S390_CPUTIME_H */