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 #include <asm/cpu_has_feature.h>
  32
  33 typedef u64 __nocast cputime_t;
  34 typedef u64 __nocast cputime64_t;
  35
  36 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
  37
  38 #ifdef __KERNEL__
  39
  40 /*
  41  * One jiffy in timebase units computed during initialization
  42  */
  43 extern cputime_t cputime_one_jiffy;
  44
  45 /*
  46  * Convert cputime <-> jiffies
  47  */
  48 extern u64 __cputime_jiffies_factor;
  49 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
  50 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
  51
  52 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
  53 {
  54         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
  55 }
  56
  57 /* Estimate the scaled cputime by scaling the real cputime based on
  58  * the last scaled to real ratio */
  59 static inline cputime_t cputime_to_scaled(const cputime_t ct)
  60 {
  61         if (cpu_has_feature(CPU_FTR_SPURR) &&
  62             __this_cpu_read(cputime_last_delta))
  63                 return (__force u64) ct *
  64                         __this_cpu_read(cputime_scaled_last_delta) /
  65                         __this_cpu_read(cputime_last_delta);
  66         return ct;
  67 }
  68
  69 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
  70 {
  71         u64 ct;
  72         unsigned long sec;
  73
  74         /* have to be a little careful about overflow */
  75         ct = jif % HZ;
  76         sec = jif / HZ;
  77         if (ct) {
  78                 ct *= tb_ticks_per_sec;
  79                 do_div(ct, HZ);
  80         }
  81         if (sec)
  82                 ct += (cputime_t) sec * tb_ticks_per_sec;
  83         return (__force cputime_t) ct;
  84 }
  85
  86 static inline void setup_cputime_one_jiffy(void)
  87 {
  88         cputime_one_jiffy = jiffies_to_cputime(1);
  89 }
  90
  91 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
  92 {
  93         u64 ct;
  94         u64 sec = jif;
  95
  96         /* have to be a little careful about overflow */
  97         ct = do_div(sec, HZ);
  98         if (ct) {
  99                 ct *= tb_ticks_per_sec;
 100                 do_div(ct, HZ);
 101         }
 102         if (sec)
 103                 ct += (u64) sec * tb_ticks_per_sec;
 104         return (__force cputime64_t) ct;
 105 }
 106
 107 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
 108 {
 109         return mulhdu((__force u64) ct, __cputime_jiffies_factor);
 110 }
 111
 112 /*
 113  * Convert cputime <-> microseconds
 114  */
 115 extern u64 __cputime_usec_factor;
 116
 117 static inline unsigned long cputime_to_usecs(const cputime_t ct)
 118 {
 119         return mulhdu((__force u64) ct, __cputime_usec_factor);
 120 }
 121
 122 static inline cputime_t usecs_to_cputime(const unsigned long us)
 123 {
 124         u64 ct;
 125         unsigned long sec;
 126
 127         /* have to be a little careful about overflow */
 128         ct = us % 1000000;
 129         sec = us / 1000000;
 130         if (ct) {
 131                 ct *= tb_ticks_per_sec;
 132                 do_div(ct, 1000000);
 133         }
 134         if (sec)
 135                 ct += (cputime_t) sec * tb_ticks_per_sec;
 136         return (__force cputime_t) ct;
 137 }
 138
 139 #define usecs_to_cputime64(us)          usecs_to_cputime(us)
 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((__force u64) ct, __cputime_sec_factor);
 149 }
 150
 151 static inline cputime_t secs_to_cputime(const unsigned long sec)
 152 {
 153         return (__force cputime_t)((u64) 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 = (__force u64) 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         u64 ct;
 174
 175         ct = (u64) p->tv_nsec * tb_ticks_per_sec;
 176         do_div(ct, 1000000000);
 177         return (__force cputime_t)(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 = (__force u64) 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         u64 ct;
 198
 199         ct = (u64) p->tv_usec * tb_ticks_per_sec;
 200         do_div(ct, 1000000);
 201         return (__force cputime_t)(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((__force u64) ct, __cputime_clockt_factor);
 212 }
 213
 214 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
 215 {
 216         u64 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 += (u64) sec * tb_ticks_per_sec;
 228         return (__force cputime_t) ct;
 229 }
 230
 231 #define cputime64_to_clock_t(ct)        cputime_to_clock_t((cputime_t)(ct))
 232
 233 /*
 234  * PPC64 uses PACA which is task independent for storing accounting data while
 235  * PPC32 uses struct thread_info, therefore at task switch the accounting data
 236  * has to be populated in the new task
 237  */
 238 #ifdef CONFIG_PPC64
 239 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
 240 #else
 241 void arch_vtime_task_switch(struct task_struct *tsk);
 242 #endif
 243
 244 #endif /* __KERNEL__ */
 245 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 246 #endif /* __POWERPC_CPUTIME_H */