LXR linux/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
  16#define __ARCH_HAS_VTIME_ACCOUNT
  17#define __ARCH_HAS_VTIME_TASK_SWITCH
  18
  19/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
  20
  21typedef unsigned long long __nocast cputime_t;
  22typedef unsigned long long __nocast cputime64_t;
  23
  24static inline unsigned long __div(unsigned long long n, unsigned long base)
  25{
  26#ifndef CONFIG_64BIT
  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#else /* CONFIG_64BIT */
  33        return n / base;
  34#endif /* CONFIG_64BIT */
  35}
  36
  37#define cputime_one_jiffy               jiffies_to_cputime(1)
  38
  39/*
  40 * Convert cputime to jiffies and back.
  41 */
  42static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
  43{
  44        return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
  45}
  46
  47static inline cputime_t jiffies_to_cputime(const unsigned int jif)
  48{
  49        return (__force cputime_t)(jif * (4096000000ULL / HZ));
  50}
  51
  52static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
  53{
  54        unsigned long long jif = (__force unsigned long long) cputime;
  55        do_div(jif, 4096000000ULL / HZ);
  56        return jif;
  57}
  58
  59static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  60{
  61        return (__force cputime64_t)(jif * (4096000000ULL / HZ));
  62}
  63
  64/*
  65 * Convert cputime to microseconds and back.
  66 */
  67static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  68{
  69        return (__force unsigned long long) cputime >> 12;
  70}
  71
  72static inline cputime_t usecs_to_cputime(const unsigned int m)
  73{
  74        return (__force cputime_t)(m * 4096ULL);
  75}
  76
  77#define usecs_to_cputime64(m)           usecs_to_cputime(m)
  78
  79/*
  80 * Convert cputime to milliseconds and back.
  81 */
  82static inline unsigned int cputime_to_secs(const cputime_t cputime)
  83{
  84        return __div((__force unsigned long long) cputime, 2048000000) >> 1;
  85}
  86
  87static inline cputime_t secs_to_cputime(const unsigned int s)
  88{
  89        return (__force cputime_t)(s * 4096000000ULL);
  90}
  91
  92/*
  93 * Convert cputime to timespec and back.
  94 */
  95static inline cputime_t timespec_to_cputime(const struct timespec *value)
  96{
  97        unsigned long long ret = value->tv_sec * 4096000000ULL;
  98        return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
  99}
 100
 101static inline void cputime_to_timespec(const cputime_t cputime,
 102                                       struct timespec *value)
 103{
 104        unsigned long long __cputime = (__force unsigned long long) cputime;
 105#ifndef CONFIG_64BIT
 106        register_pair rp;
 107
 108        rp.pair = __cputime >> 1;
 109        asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 110        value->tv_nsec = rp.subreg.even * 1000 / 4096;
 111        value->tv_sec = rp.subreg.odd;
 112#else
 113        value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
 114        value->tv_sec = __cputime / 4096000000ULL;
 115#endif
 116}
 117
 118/*
 119 * Convert cputime to timeval and back.
 120 * Since cputime and timeval have the same resolution (microseconds)
 121 * this is easy.
 122 */
 123static inline cputime_t timeval_to_cputime(const struct timeval *value)
 124{
 125        unsigned long long ret = value->tv_sec * 4096000000ULL;
 126        return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
 127}
 128
 129static inline void cputime_to_timeval(const cputime_t cputime,
 130                                      struct timeval *value)
 131{
 132        unsigned long long __cputime = (__force unsigned long long) cputime;
 133#ifndef CONFIG_64BIT
 134        register_pair rp;
 135
 136        rp.pair = __cputime >> 1;
 137        asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
 138        value->tv_usec = rp.subreg.even / 4096;
 139        value->tv_sec = rp.subreg.odd;
 140#else
 141        value->tv_usec = (__cputime % 4096000000ULL) / 4096;
 142        value->tv_sec = __cputime / 4096000000ULL;
 143#endif
 144}
 145
 146/*
 147 * Convert cputime to clock and back.
 148 */
 149static inline clock_t cputime_to_clock_t(cputime_t cputime)
 150{
 151        unsigned long long clock = (__force unsigned long long) cputime;
 152        do_div(clock, 4096000000ULL / USER_HZ);
 153        return clock;
 154}
 155
 156static inline cputime_t clock_t_to_cputime(unsigned long x)
 157{
 158        return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
 159}
 160
 161/*
 162 * Convert cputime64 to clock.
 163 */
 164static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
 165{
 166        unsigned long long clock = (__force unsigned long long) cputime;
 167        do_div(clock, 4096000000ULL / USER_HZ);
 168        return clock;
 169}
 170
 171struct s390_idle_data {
 172        int nohz_delay;
 173        unsigned int sequence;
 174        unsigned long long idle_count;
 175        unsigned long long idle_time;
 176        unsigned long long clock_idle_enter;
 177        unsigned long long clock_idle_exit;
 178        unsigned long long timer_idle_enter;
 179        unsigned long long timer_idle_exit;
 180};
 181
 182DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
 183
 184cputime64_t s390_get_idle_time(int cpu);
 185
 186#define arch_idle_time(cpu) s390_get_idle_time(cpu)
 187
 188static inline int s390_nohz_delay(int cpu)
 189{
 190        return __get_cpu_var(s390_idle).nohz_delay != 0;
 191}
 192
 193#define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
 194
 195#endif /* _S390_CPUTIME_H */
 196