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 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
  36
  37 #ifdef __KERNEL__
  38
  39 /*
  40  * One jiffy in timebase units computed during initialization
  41  */
  42 extern cputime_t cputime_one_jiffy;
  43
  44 /*
  45  * Convert cputime <-> jiffies
  46  */
  47 extern u64 __cputime_jiffies_factor;
  48 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
  49 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
  50
  51 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
  52 {
  53         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
  54 }
  55
  56 /* Estimate the scaled cputime by scaling the real cputime based on
  57  * the last scaled to real ratio */
  58 static inline cputime_t cputime_to_scaled(const cputime_t ct)
  59 {
  60         if (cpu_has_feature(CPU_FTR_SPURR) &&
  61             __this_cpu_read(cputime_last_delta))
  62                 return (__force u64) ct *
  63                         __this_cpu_read(cputime_scaled_last_delta) /
  64                         __this_cpu_read(cputime_last_delta);
  65         return ct;
  66 }
  67
  68 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
  69 {
  70         u64 ct;
  71         unsigned long sec;
  72
  73         /* have to be a little careful about overflow */
  74         ct = jif % HZ;
  75         sec = jif / HZ;
  76         if (ct) {
  77                 ct *= tb_ticks_per_sec;
  78                 do_div(ct, HZ);
  79         }
  80         if (sec)
  81                 ct += (cputime_t) sec * tb_ticks_per_sec;
  82         return (__force cputime_t) ct;
  83 }
  84
  85 static inline void setup_cputime_one_jiffy(void)
  86 {
  87         cputime_one_jiffy = jiffies_to_cputime(1);
  88 }
  89
  90 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  91 {
  92         u64 ct;
  93         u64 sec = jif;
  94
  95         /* have to be a little careful about overflow */
  96         ct = do_div(sec, HZ);
  97         if (ct) {
  98                 ct *= tb_ticks_per_sec;
  99                 do_div(ct, HZ);
 100         }
 101         if (sec)
 102                 ct += (u64) sec * tb_ticks_per_sec;
 103         return (__force cputime64_t) ct;
 104 }
 105
 106 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
 107 {
 108         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
 109 }
 110
 111 /*
 112  * Convert cputime <-> microseconds
 113  */
 114 extern u64 __cputime_usec_factor;
 115
 116 static inline unsigned long cputime_to_usecs(const cputime_t ct)
 117 {
 118         return mulhdu((__force u64) ct, __cputime_usec_factor);
 119 }
 120
 121 static inline cputime_t usecs_to_cputime(const unsigned long us)
 122 {
 123         u64 ct;
 124         unsigned long sec;
 125
 126         /* have to be a little careful about overflow */
 127         ct = us % 1000000;
 128         sec = us / 1000000;
 129         if (ct) {
 130                 ct *= tb_ticks_per_sec;
 131                 do_div(ct, 1000000);
 132         }
 133         if (sec)
 134                 ct += (cputime_t) sec * tb_ticks_per_sec;
 135         return (__force cputime_t) ct;
 136 }
 137
 138 #define usecs_to_cputime64(us)          usecs_to_cputime(us)
 139
 140 /*
 141  * Convert cputime <-> seconds
 142  */
 143 extern u64 __cputime_sec_factor;
 144
 145 static inline unsigned long cputime_to_secs(const cputime_t ct)
 146 {
 147         return mulhdu((__force u64) ct, __cputime_sec_factor);
 148 }
 149
 150 static inline cputime_t secs_to_cputime(const unsigned long sec)
 151 {
 152         return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
 153 }
 154
 155 /*
 156  * Convert cputime <-> timespec
 157  */
 158 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
 159 {
 160         u64 x = (__force u64) ct;
 161         unsigned int frac;
 162
 163         frac = do_div(x, tb_ticks_per_sec);
 164         p->tv_sec = x;
 165         x = (u64) frac * 1000000000;
 166         do_div(x, tb_ticks_per_sec);
 167         p->tv_nsec = x;
 168 }
 169
 170 static inline cputime_t timespec_to_cputime(const struct timespec *p)
 171 {
 172         u64 ct;
 173
 174         ct = (u64) p->tv_nsec * tb_ticks_per_sec;
 175         do_div(ct, 1000000000);
 176         return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
 177 }
 178
 179 /*
 180  * Convert cputime <-> timeval
 181  */
 182 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
 183 {
 184         u64 x = (__force u64) ct;
 185         unsigned int frac;
 186
 187         frac = do_div(x, tb_ticks_per_sec);
 188         p->tv_sec = x;
 189         x = (u64) frac * 1000000;
 190         do_div(x, tb_ticks_per_sec);
 191         p->tv_usec = x;
 192 }
 193
 194 static inline cputime_t timeval_to_cputime(const struct timeval *p)
 195 {
 196         u64 ct;
 197
 198         ct = (u64) p->tv_usec * tb_ticks_per_sec;
 199         do_div(ct, 1000000);
 200         return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
 201 }
 202
 203 /*
 204  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
 205  */
 206 extern u64 __cputime_clockt_factor;
 207
 208 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
 209 {
 210         return mulhdu((__force u64) ct, __cputime_clockt_factor);
 211 }
 212
 213 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
 214 {
 215         u64 ct;
 216         unsigned long sec;
 217
 218         /* have to be a little careful about overflow */
 219         ct = clk % USER_HZ;
 220         sec = clk / USER_HZ;
 221         if (ct) {
 222                 ct *= tb_ticks_per_sec;
 223                 do_div(ct, USER_HZ);
 224         }
 225         if (sec)
 226                 ct += (u64) sec * tb_ticks_per_sec;
 227         return (__force cputime_t) ct;
 228 }
 229
 230 #define cputime64_to_clock_t(ct)        cputime_to_clock_t((cputime_t)(ct))
 231
 232 /*
 233  * PPC64 uses PACA which is task independent for storing accounting data while
 234  * PPC32 uses struct thread_info, therefore at task switch the accounting data
 235  * has to be populated in the new task
 236  */
 237 #ifdef CONFIG_PPC64
 238 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
 239 #else
 240 void arch_vtime_task_switch(struct task_struct *tsk);
 241 #endif
 242
 243 #endif /* __KERNEL__ */
 244 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 245 #endif /* __POWERPC_CPUTIME_H */