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_NATIVE, 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_NATIVE
  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 __nocast cputime_t;
  33 typedef u64 __nocast cputime64_t;
  34
  35 #ifdef __KERNEL__
  36
  37 /*
  38  * One jiffy in timebase units computed during initialization
  39  */
  40 extern cputime_t cputime_one_jiffy;
  41
  42 /*
  43  * Convert cputime <-> jiffies
  44  */
  45 extern u64 __cputime_jiffies_factor;
  46 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
  47 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
  48
  49 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
  50 {
  51         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
  52 }
  53
  54 /* Estimate the scaled cputime by scaling the real cputime based on
  55  * the last scaled to real ratio */
  56 static inline cputime_t cputime_to_scaled(const cputime_t ct)
  57 {
  58         if (cpu_has_feature(CPU_FTR_SPURR) &&
  59             __get_cpu_var(cputime_last_delta))
  60                 return (__force u64) ct *
  61                         __get_cpu_var(cputime_scaled_last_delta) /
  62                         __get_cpu_var(cputime_last_delta);
  63         return ct;
  64 }
  65
  66 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
  67 {
  68         u64 ct;
  69         unsigned long sec;
  70
  71         /* have to be a little careful about overflow */
  72         ct = jif % HZ;
  73         sec = jif / HZ;
  74         if (ct) {
  75                 ct *= tb_ticks_per_sec;
  76                 do_div(ct, HZ);
  77         }
  78         if (sec)
  79                 ct += (cputime_t) sec * tb_ticks_per_sec;
  80         return (__force cputime_t) ct;
  81 }
  82
  83 static inline void setup_cputime_one_jiffy(void)
  84 {
  85         cputime_one_jiffy = jiffies_to_cputime(1);
  86 }
  87
  88 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  89 {
  90         u64 ct;
  91         u64 sec;
  92
  93         /* have to be a little careful about overflow */
  94         ct = jif % HZ;
  95         sec = jif / HZ;
  96         if (ct) {
  97                 ct *= tb_ticks_per_sec;
  98                 do_div(ct, HZ);
  99         }
 100         if (sec)
 101                 ct += (u64) sec * tb_ticks_per_sec;
 102         return (__force cputime64_t) ct;
 103 }
 104
 105 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
 106 {
 107         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
 108 }
 109
 110 /*
 111  * Convert cputime <-> microseconds
 112  */
 113 extern u64 __cputime_usec_factor;
 114
 115 static inline unsigned long cputime_to_usecs(const cputime_t ct)
 116 {
 117         return mulhdu((__force u64) ct, __cputime_usec_factor);
 118 }
 119
 120 static inline cputime_t usecs_to_cputime(const unsigned long us)
 121 {
 122         u64 ct;
 123         unsigned long sec;
 124
 125         /* have to be a little careful about overflow */
 126         ct = us % 1000000;
 127         sec = us / 1000000;
 128         if (ct) {
 129                 ct *= tb_ticks_per_sec;
 130                 do_div(ct, 1000000);
 131         }
 132         if (sec)
 133                 ct += (cputime_t) sec * tb_ticks_per_sec;
 134         return (__force cputime_t) ct;
 135 }
 136
 137 #define usecs_to_cputime64(us)          usecs_to_cputime(us)
 138
 139 /*
 140  * Convert cputime <-> seconds
 141  */
 142 extern u64 __cputime_sec_factor;
 143
 144 static inline unsigned long cputime_to_secs(const cputime_t ct)
 145 {
 146         return mulhdu((__force u64) ct, __cputime_sec_factor);
 147 }
 148
 149 static inline cputime_t secs_to_cputime(const unsigned long sec)
 150 {
 151         return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
 152 }
 153
 154 /*
 155  * Convert cputime <-> timespec
 156  */
 157 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
 158 {
 159         u64 x = (__force u64) ct;
 160         unsigned int frac;
 161
 162         frac = do_div(x, tb_ticks_per_sec);
 163         p->tv_sec = x;
 164         x = (u64) frac * 1000000000;
 165         do_div(x, tb_ticks_per_sec);
 166         p->tv_nsec = x;
 167 }
 168
 169 static inline cputime_t timespec_to_cputime(const struct timespec *p)
 170 {
 171         u64 ct;
 172
 173         ct = (u64) p->tv_nsec * tb_ticks_per_sec;
 174         do_div(ct, 1000000000);
 175         return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
 176 }
 177
 178 /*
 179  * Convert cputime <-> timeval
 180  */
 181 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
 182 {
 183         u64 x = (__force u64) ct;
 184         unsigned int frac;
 185
 186         frac = do_div(x, tb_ticks_per_sec);
 187         p->tv_sec = x;
 188         x = (u64) frac * 1000000;
 189         do_div(x, tb_ticks_per_sec);
 190         p->tv_usec = x;
 191 }
 192
 193 static inline cputime_t timeval_to_cputime(const struct timeval *p)
 194 {
 195         u64 ct;
 196
 197         ct = (u64) p->tv_usec * tb_ticks_per_sec;
 198         do_div(ct, 1000000);
 199         return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
 200 }
 201
 202 /*
 203  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
 204  */
 205 extern u64 __cputime_clockt_factor;
 206
 207 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
 208 {
 209         return mulhdu((__force u64) ct, __cputime_clockt_factor);
 210 }
 211
 212 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
 213 {
 214         u64 ct;
 215         unsigned long sec;
 216
 217         /* have to be a little careful about overflow */
 218         ct = clk % USER_HZ;
 219         sec = clk / USER_HZ;
 220         if (ct) {
 221                 ct *= tb_ticks_per_sec;
 222                 do_div(ct, USER_HZ);
 223         }
 224         if (sec)
 225                 ct += (u64) sec * tb_ticks_per_sec;
 226         return (__force cputime_t) ct;
 227 }
 228
 229 #define cputime64_to_clock_t(ct)        cputime_to_clock_t((cputime_t)(ct))
 230
 231 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
 232
 233 #endif /* __KERNEL__ */
 234 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 235 #endif /* __POWERPC_CPUTIME_H */