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 */ 246