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 */ 247