release/src-rt-6.x.4708/linux/linux-2.6.36/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 #ifdef __KERNEL__
  22 static inline void setup_cputime_one_jiffy(void) { }
  23 #endif
  24 #else
  25
  26 #include <linux/types.h>
  27 #include <linux/time.h>
  28 #include <asm/div64.h>
  29 #include <asm/time.h>
  30 #include <asm/param.h>
  31
  32 typedef u64 cputime_t;
  33 typedef u64 cputime64_t;
  34
  35 #define cputime_zero                    ((cputime_t)0)
  36 #define cputime_max                     ((~((cputime_t)0) >> 1) - 1)
  37 #define cputime_add(__a, __b)           ((__a) +  (__b))
  38 #define cputime_sub(__a, __b)           ((__a) -  (__b))
  39 #define cputime_div(__a, __n)           ((__a) /  (__n))
  40 #define cputime_halve(__a)              ((__a) >> 1)
  41 #define cputime_eq(__a, __b)            ((__a) == (__b))
  42 #define cputime_gt(__a, __b)            ((__a) >  (__b))
  43 #define cputime_ge(__a, __b)            ((__a) >= (__b))
  44 #define cputime_lt(__a, __b)            ((__a) <  (__b))
  45 #define cputime_le(__a, __b)            ((__a) <= (__b))
  46
  47 #define cputime64_zero                  ((cputime64_t)0)
  48 #define cputime64_add(__a, __b)         ((__a) + (__b))
  49 #define cputime64_sub(__a, __b)         ((__a) - (__b))
  50 #define cputime_to_cputime64(__ct)      (__ct)
  51
  52 #ifdef __KERNEL__
  53
  54 /*
  55  * One jiffy in timebase units computed during initialization
  56  */
  57 extern cputime_t cputime_one_jiffy;
  58
  59 /*
  60  * Convert cputime <-> jiffies
  61  */
  62 extern u64 __cputime_jiffies_factor;
  63 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
  64 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
  65
  66 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
  67 {
  68         return mulhdu(ct, __cputime_jiffies_factor);
  69 }
  70
  71 /* Estimate the scaled cputime by scaling the real cputime based on
  72  * the last scaled to real ratio */
  73 static inline cputime_t cputime_to_scaled(const cputime_t ct)
  74 {
  75         if (cpu_has_feature(CPU_FTR_SPURR) &&
  76             __get_cpu_var(cputime_last_delta))
  77                 return ct * __get_cpu_var(cputime_scaled_last_delta) /
  78                             __get_cpu_var(cputime_last_delta);
  79         return ct;
  80 }
  81
  82 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
  83 {
  84         cputime_t ct;
  85         unsigned long sec;
  86
  87         /* have to be a little careful about overflow */
  88         ct = jif % HZ;
  89         sec = jif / HZ;
  90         if (ct) {
  91                 ct *= tb_ticks_per_sec;
  92                 do_div(ct, HZ);
  93         }
  94         if (sec)
  95                 ct += (cputime_t) sec * tb_ticks_per_sec;
  96         return ct;
  97 }
  98
  99 static inline void setup_cputime_one_jiffy(void)
 100 {
 101         cputime_one_jiffy = jiffies_to_cputime(1);
 102 }
 103
 104 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
 105 {
 106         cputime_t ct;
 107         u64 sec;
 108
 109         /* have to be a little careful about overflow */
 110         ct = jif % HZ;
 111         sec = jif / HZ;
 112         if (ct) {
 113                 ct *= tb_ticks_per_sec;
 114                 do_div(ct, HZ);
 115         }
 116         if (sec)
 117                 ct += (cputime_t) sec * tb_ticks_per_sec;
 118         return ct;
 119 }
 120
 121 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
 122 {
 123         return mulhdu(ct, __cputime_jiffies_factor);
 124 }
 125
 126 /*
 127  * Convert cputime <-> milliseconds
 128  */
 129 extern u64 __cputime_msec_factor;
 130
 131 static inline unsigned long cputime_to_msecs(const cputime_t ct)
 132 {
 133         return mulhdu(ct, __cputime_msec_factor);
 134 }
 135
 136 static inline cputime_t msecs_to_cputime(const unsigned long ms)
 137 {
 138         cputime_t ct;
 139         unsigned long sec;
 140
 141         /* have to be a little careful about overflow */
 142         ct = ms % 1000;
 143         sec = ms / 1000;
 144         if (ct) {
 145                 ct *= tb_ticks_per_sec;
 146                 do_div(ct, 1000);
 147         }
 148         if (sec)
 149                 ct += (cputime_t) sec * tb_ticks_per_sec;
 150         return ct;
 151 }
 152
 153 /*
 154  * Convert cputime <-> seconds
 155  */
 156 extern u64 __cputime_sec_factor;
 157
 158 static inline unsigned long cputime_to_secs(const cputime_t ct)
 159 {
 160         return mulhdu(ct, __cputime_sec_factor);
 161 }
 162
 163 static inline cputime_t secs_to_cputime(const unsigned long sec)
 164 {
 165         return (cputime_t) sec * tb_ticks_per_sec;
 166 }
 167
 168 /*
 169  * Convert cputime <-> timespec
 170  */
 171 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
 172 {
 173         u64 x = ct;
 174         unsigned int frac;
 175
 176         frac = do_div(x, tb_ticks_per_sec);
 177         p->tv_sec = x;
 178         x = (u64) frac * 1000000000;
 179         do_div(x, tb_ticks_per_sec);
 180         p->tv_nsec = x;
 181 }
 182
 183 static inline cputime_t timespec_to_cputime(const struct timespec *p)
 184 {
 185         cputime_t ct;
 186
 187         ct = (u64) p->tv_nsec * tb_ticks_per_sec;
 188         do_div(ct, 1000000000);
 189         return ct + (u64) p->tv_sec * tb_ticks_per_sec;
 190 }
 191
 192 /*
 193  * Convert cputime <-> timeval
 194  */
 195 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
 196 {
 197         u64 x = ct;
 198         unsigned int frac;
 199
 200         frac = do_div(x, tb_ticks_per_sec);
 201         p->tv_sec = x;
 202         x = (u64) frac * 1000000;
 203         do_div(x, tb_ticks_per_sec);
 204         p->tv_usec = x;
 205 }
 206
 207 static inline cputime_t timeval_to_cputime(const struct timeval *p)
 208 {
 209         cputime_t ct;
 210
 211         ct = (u64) p->tv_usec * tb_ticks_per_sec;
 212         do_div(ct, 1000000);
 213         return ct + (u64) p->tv_sec * tb_ticks_per_sec;
 214 }
 215
 216 /*
 217  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
 218  */
 219 extern u64 __cputime_clockt_factor;
 220
 221 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
 222 {
 223         return mulhdu(ct, __cputime_clockt_factor);
 224 }
 225
 226 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
 227 {
 228         cputime_t ct;
 229         unsigned long sec;
 230
 231         /* have to be a little careful about overflow */
 232         ct = clk % USER_HZ;
 233         sec = clk / USER_HZ;
 234         if (ct) {
 235                 ct *= tb_ticks_per_sec;
 236                 do_div(ct, USER_HZ);
 237         }
 238         if (sec)
 239                 ct += (cputime_t) sec * tb_ticks_per_sec;
 240         return ct;
 241 }
 242
 243 #define cputime64_to_clock_t(ct)        cputime_to_clock_t((cputime_t)(ct))
 244
 245 #endif /* __KERNEL__ */
 246 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
 247 #endif /* __POWERPC_CPUTIME_H */