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 static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 47 #else 48 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 49 /* 50 * Called from the context switch with interrupts disabled, to charge all 51 * accumulated times to the current process, and to prepare accounting on 52 * the next process. 53 */ 54 static inline void arch_vtime_task_switch(struct task_struct *prev) 55 { 56 struct cpu_accounting_data *acct = get_accounting(current); 57 struct cpu_accounting_data *acct0 = get_accounting(prev); 58 59 acct->starttime = acct0->starttime; 60 } 61 #endif 62 63 #endif /* __KERNEL__ */ 64 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 65 #endif /* __POWERPC_CPUTIME_H */ 66