1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Definitions for measuring cputime on powerpc machines. 4 * 5 * Copyright (C) 2006 Paul Mackerras, IBM Corp. 6 * 7 * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in 8 * the same units as the timebase. Otherwise we measure cpu time 9 * in jiffies using the generic definitions. 10 */ 11 12 #ifndef __POWERPC_CPUTIME_H 13 #define __POWERPC_CPUTIME_H 14 15 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 16 17 #include <linux/types.h> 18 #include <linux/time.h> 19 #include <asm/div64.h> 20 #include <asm/time.h> 21 #include <asm/param.h> 22 23 typedef u64 __nocast cputime_t; 24 typedef u64 __nocast cputime64_t; 25 26 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) 27 28 #ifdef __KERNEL__ 29 /* 30 * Convert cputime <-> microseconds 31 */ 32 extern u64 __cputime_usec_factor; 33 34 static inline unsigned long cputime_to_usecs(const cputime_t ct) 35 { 36 return mulhdu((__force u64) ct, __cputime_usec_factor); 37 } 38 39 /* 40 * PPC64 uses PACA which is task independent for storing accounting data while 41 * PPC32 uses struct thread_info, therefore at task switch the accounting data 42 * has to be populated in the new task 43 */ 44 #ifdef CONFIG_PPC64 45 #define get_accounting(tsk) (&get_paca()->accounting) 46 #define raw_get_accounting(tsk) (&local_paca->accounting) 47 static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 48 49 #else 50 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 51 #define raw_get_accounting(tsk) get_accounting(tsk) 52 /* 53 * Called from the context switch with interrupts disabled, to charge all 54 * accumulated times to the current process, and to prepare accounting on 55 * the next process. 56 */ 57 static inline void arch_vtime_task_switch(struct task_struct *prev) 58 { 59 struct cpu_accounting_data *acct = get_accounting(current); 60 struct cpu_accounting_data *acct0 = get_accounting(prev); 61 62 acct->starttime = acct0->starttime; 63 } 64 #endif 65 66 /* 67 * account_cpu_user_entry/exit runs "unreconciled", so can't trace, 68 * can't use use get_paca() 69 */ 70 static notrace inline void account_cpu_user_entry(void) 71 { 72 unsigned long tb = mftb(); 73 struct cpu_accounting_data *acct = raw_get_accounting(current); 74 75 acct->utime += (tb - acct->starttime_user); 76 acct->starttime = tb; 77 } 78 79 static notrace inline void account_cpu_user_exit(void) 80 { 81 unsigned long tb = mftb(); 82 struct cpu_accounting_data *acct = raw_get_accounting(current); 83 84 acct->stime += (tb - acct->starttime); 85 acct->starttime_user = tb; 86 } 87 88 89 #endif /* __KERNEL__ */ 90 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 91 static inline void account_cpu_user_entry(void) 92 { 93 } 94 static inline void account_cpu_user_exit(void) 95 { 96 } 97 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 98 #endif /* __POWERPC_CPUTIME_H */ 99