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 <linux/percpu.h>
  12 #include <linux/spinlock.h>
  13 #include <asm/div64.h>
  14
  15 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
  16
  17 typedef unsigned long long __nocast cputime_t;
  18 typedef unsigned long long __nocast cputime64_t;
  19
  20 static inline unsigned long __div(unsigned long long n, unsigned long base)
  21 {
  22 #ifndef CONFIG_64BIT
  23         register_pair rp;
  24
  25         rp.pair = n >> 1;
  26         asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
  27         return rp.subreg.odd;
  28 #else /* CONFIG_64BIT */
  29         return n / base;
  30 #endif /* CONFIG_64BIT */
  31 }
  32
  33 #define cputime_one_jiffy               jiffies_to_cputime(1)
  34
  35 /*
  36  * Convert cputime to jiffies and back.
  37  */
  38 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
  39 {
  40         return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
  41 }
  42
  43 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
  44 {
  45         return (__force cputime_t)(jif * (4096000000ULL / HZ));
  46 }
  47
  48 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
  49 {
  50         unsigned long long jif = (__force unsigned long long) cputime;
  51         do_div(jif, 4096000000ULL / HZ);
  52         return jif;
  53 }
  54
  55 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  56 {
  57         return (__force cputime64_t)(jif * (4096000000ULL / HZ));
  58 }
  59
  60 /*
  61  * Convert cputime to microseconds and back.
  62  */
  63 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  64 {
  65         return (__force unsigned long long) cputime >> 12;
  66 }
  67
  68 static inline cputime_t usecs_to_cputime(const unsigned int m)
  69 {
  70         return (__force cputime_t)(m * 4096ULL);
  71 }
  72
  73 #define usecs_to_cputime64(m)           usecs_to_cputime(m)
  74
  75 /*
  76  * Convert cputime to milliseconds and back.
  77  */
  78 static inline unsigned int cputime_to_secs(const cputime_t cputime)
  79 {
  80         return __div((__force unsigned long long) cputime, 2048000000) >> 1;
  81 }
  82
  83 static inline cputime_t secs_to_cputime(const unsigned int s)
  84 {
  85         return (__force cputime_t)(s * 4096000000ULL);
  86 }
  87
  88 /*
  89  * Convert cputime to timespec and back.
  90  */
  91 static inline cputime_t timespec_to_cputime(const struct timespec *value)
  92 {
  93         unsigned long long ret = value->tv_sec * 4096000000ULL;
  94         return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
  95 }
  96
  97 static inline void cputime_to_timespec(const cputime_t cputime,
  98                                        struct timespec *value)
  99 {
 100         unsigned long long __cputime = (__force unsigned long long) cputime;
 101 #ifndef CONFIG_64BIT
 102         register_pair rp;
 103
 104         rp.pair = __cputime >> 1;
 105         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 106         value->tv_nsec = rp.subreg.even * 1000 / 4096;
 107         value->tv_sec = rp.subreg.odd;
 108 #else
 109         value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
 110         value->tv_sec = __cputime / 4096000000ULL;
 111 #endif
 112 }
 113
 114 /*
 115  * Convert cputime to timeval and back.
 116  * Since cputime and timeval have the same resolution (microseconds)
 117  * this is easy.
 118  */
 119 static inline cputime_t timeval_to_cputime(const struct timeval *value)
 120 {
 121         unsigned long long ret = value->tv_sec * 4096000000ULL;
 122         return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
 123 }
 124
 125 static inline void cputime_to_timeval(const cputime_t cputime,
 126                                       struct timeval *value)
 127 {
 128         unsigned long long __cputime = (__force unsigned long long) cputime;
 129 #ifndef CONFIG_64BIT
 130         register_pair rp;
 131
 132         rp.pair = __cputime >> 1;
 133         asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 134         value->tv_usec = rp.subreg.even / 4096;
 135         value->tv_sec = rp.subreg.odd;
 136 #else
 137         value->tv_usec = (__cputime % 4096000000ULL) / 4096;
 138         value->tv_sec = __cputime / 4096000000ULL;
 139 #endif
 140 }
 141
 142 /*
 143  * Convert cputime to clock and back.
 144  */
 145 static inline clock_t cputime_to_clock_t(cputime_t cputime)
 146 {
 147         unsigned long long clock = (__force unsigned long long) cputime;
 148         do_div(clock, 4096000000ULL / USER_HZ);
 149         return clock;
 150 }
 151
 152 static inline cputime_t clock_t_to_cputime(unsigned long x)
 153 {
 154         return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
 155 }
 156
 157 /*
 158  * Convert cputime64 to clock.
 159  */
 160 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 161 {
 162         unsigned long long clock = (__force unsigned long long) cputime;
 163         do_div(clock, 4096000000ULL / USER_HZ);
 164         return clock;
 165 }
 166
 167 struct s390_idle_data {
 168         int nohz_delay;
 169         unsigned int sequence;
 170         unsigned long long idle_count;
 171         unsigned long long idle_time;
 172         unsigned long long clock_idle_enter;
 173         unsigned long long clock_idle_exit;
 174         unsigned long long timer_idle_enter;
 175         unsigned long long timer_idle_exit;
 176 };
 177
 178 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
 179
 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 int s390_nohz_delay(int cpu)
 185 {
 186         return __get_cpu_var(s390_idle).nohz_delay != 0;
 187 }
 188
 189 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
 190
 191 #endif /* _S390_CPUTIME_H */