kernel/2.6.29.6-aldebaran-rt/arch/powerpc/include/asm/cputime.h

   1 /*
   2  * Definitions for measuring cputime on powerpc machines.
   3  *
   4  * Copyright (C) 2006 Paul Mackerras, IBM Corp.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * If we have CONFIG_VIRT_CPU_ACCOUNTING, we measure cpu time in
  12  * the same units as the timebase.  Otherwise we measure cpu time
  13  * in jiffies using the generic definitions.
  14  */
  15
  16 #ifndef __POWERPC_CPUTIME_H
  17 #define __POWERPC_CPUTIME_H
  18
  19 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  20 #include <asm-generic/cputime.h>
  21 #else
  22
  23 #include <linux/types.h>
  24 #include <linux/time.h>
  25 #include <asm/div64.h>
  26 #include <asm/time.h>
  27 #include <asm/param.h>
  28
  29 typedef u64 cputime_t;
  30 typedef u64 cputime64_t;
  31
  32 #define cputime_zero                    ((cputime_t)0)
  33 #define cputime_max                     ((~((cputime_t)0) >> 1) - 1)
  34 #define cputime_add(__a, __b)           ((__a) +  (__b))
  35 #define cputime_sub(__a, __b)           ((__a) -  (__b))
  36 #define cputime_div(__a, __n)           ((__a) /  (__n))
  37 #define cputime_halve(__a)              ((__a) >> 1)
  38 #define cputime_eq(__a, __b)            ((__a) == (__b))
  39 #define cputime_gt(__a, __b)            ((__a) >  (__b))
  40 #define cputime_ge(__a, __b)            ((__a) >= (__b))
  41 #define cputime_lt(__a, __b)            ((__a) <  (__b))
  42 #define cputime_le(__a, __b)            ((__a) <= (__b))
  43
  44 #define cputime64_zero                  ((cputime64_t)0)
  45 #define cputime64_add(__a, __b)         ((__a) + (__b))
  46 #define cputime64_sub(__a, __b)         ((__a) - (__b))
  47 #define cputime_to_cputime64(__ct)      (__ct)
  48
  49 #ifdef __KERNEL__
  50
  51 /*
  52  * Convert cputime <-> jiffies
  53  */
  54 extern u64 __cputime_jiffies_factor;
  55 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
  56 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
  57
  58 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
  59 {
  60         return mulhdu(ct, __cputime_jiffies_factor);
  61 }
  62
  63 /* Estimate the scaled cputime by scaling the real cputime based on
  64  * the last scaled to real ratio */
  65 static inline cputime_t cputime_to_scaled(const cputime_t ct)
  66 {
  67         if (cpu_has_feature(CPU_FTR_SPURR) &&
  68             per_cpu(cputime_last_delta, smp_processor_id()))
  69                 return ct *
  70                         per_cpu(cputime_scaled_last_delta, smp_processor_id())/
  71                         per_cpu(cputime_last_delta, smp_processor_id());
  72         return ct;
  73 }
  74
  75 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
  76 {
  77         cputime_t ct;
  78         unsigned long sec;
  79
  80         /* have to be a little careful about overflow */
  81         ct = jif % HZ;
  82         sec = jif / HZ;
  83         if (ct) {
  84                 ct *= tb_ticks_per_sec;
  85                 do_div(ct, HZ);
  86         }
  87         if (sec)
  88                 ct += (cputime_t) sec * tb_ticks_per_sec;
  89         return ct;
  90 }
  91
  92 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  93 {
  94         cputime_t ct;
  95         u64 sec;
  96
  97         /* have to be a little careful about overflow */
  98         ct = jif % HZ;
  99         sec = jif / HZ;
 100         if (ct) {
 101                 ct *= tb_ticks_per_sec;
 102                 do_div(ct, HZ);
 103         }
 104         if (sec)
 105                 ct += (cputime_t) sec * tb_ticks_per_sec;
 106         return ct;
 107 }
 108
 109 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
 110 {
 111         return mulhdu(ct, __cputime_jiffies_factor);
 112 }
 113
 114 /*
 115  * Convert cputime <-> milliseconds
 116  */
 117 extern u64 __cputime_msec_factor;
 118
 119 static inline unsigned long cputime_to_msecs(const cputime_t ct)
 120 {
 121         return mulhdu(ct, __cputime_msec_factor);
 122 }
 123
 124 static inline cputime_t msecs_to_cputime(const unsigned long ms)
 125 {
 126         cputime_t ct;
 127         unsigned long sec;
 128
 129         /* have to be a little careful about overflow */
 130         ct = ms % 1000;
 131         sec = ms / 1000;
 132         if (ct) {
 133                 ct *= tb_ticks_per_sec;
 134                 do_div(ct, 1000);
 135         }
 136         if (sec)
 137                 ct += (cputime_t) sec * tb_ticks_per_sec;
 138         return ct;
 139 }
 140
 141 /*
 142  * Convert cputime <-> seconds
 143  */
 144 extern u64 __cputime_sec_factor;
 145
 146 static inline unsigned long cputime_to_secs(const cputime_t ct)
 147 {
 148         return mulhdu(ct, __cputime_sec_factor);
 149 }
 150
 151 static inline cputime_t secs_to_cputime(const unsigned long sec)
 152 {
 153         return (cputime_t) sec * tb_ticks_per_sec;
 154 }
 155
 156 /*
 157  * Convert cputime <-> timespec
 158  */
 159 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
 160 {
 161         u64 x = ct;
 162         unsigned int frac;
 163
 164         frac = do_div(x, tb_ticks_per_sec);
 165         p->tv_sec = x;
 166         x = (u64) frac * 1000000000;
 167         do_div(x, tb_ticks_per_sec);
 168         p->tv_nsec = x;
 169 }
 170
 171 static inline cputime_t timespec_to_cputime(const struct timespec *p)
 172 {
 173         cputime_t ct;
 174
 175         ct = (u64) p->tv_nsec * tb_ticks_per_sec;
 176         do_div(ct, 1000000000);
 177         return ct + (u64) p->tv_sec * tb_ticks_per_sec;
 178 }
 179
 180 /*
 181  * Convert cputime <-> timeval
 182  */
 183 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
 184 {
 185         u64 x = ct;
 186         unsigned int frac;
 187
 188         frac = do_div(x, tb_ticks_per_sec);
 189         p->tv_sec = x;
 190         x = (u64) frac * 1000000;
 191         do_div(x, tb_ticks_per_sec);
 192         p->tv_usec = x;
 193 }
 194
 195 static inline cputime_t timeval_to_cputime(const struct timeval *p)
 196 {
 197         cputime_t ct;
 198
 199         ct = (u64) p->tv_usec * tb_ticks_per_sec;
 200         do_div(ct, 1000000);
 201         return ct + (u64) p->tv_sec * tb_ticks_per_sec;
 202 }
 203
 204 /*
 205  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
 206  */
 207 extern u64 __cputime_clockt_factor;
 208
 209 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
 210 {
 211         return mulhdu(ct, __cputime_clockt_factor);
 212 }
 213
 214 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
 215 {
 216         cputime_t ct;
 217         unsigned long sec;
 218
 219         /* have to be a little careful about overflow */
 220         ct = clk % USER_HZ;
 221         sec = clk / USER_HZ;
 222         if (ct) {
 223                 ct *= tb_ticks_per_sec;
 224                 do_div(ct, USER_HZ);
 225         }
 226         if (sec)
 227                 ct += (cputime_t) sec * tb_ticks_per_sec;
 228         return ct;
 229 }
 230
 231 #define cputime64_to_clock_t(ct)        cputime_to_clock_t((cputime_t)(ct))
 232
 233 #endif /* __KERNEL__ */
 234 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
 235 #endif /* __POWERPC_CPUTIME_H */