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#include <asm/firmware.h> 23 24#ifdef __KERNEL__ 25#define cputime_to_nsecs(cputime) tb_to_ns(cputime) 26 27/* 28 * PPC64 uses PACA which is task independent for storing accounting data while 29 * PPC32 uses struct thread_info, therefore at task switch the accounting data 30 * has to be populated in the new task 31 */ 32#ifdef CONFIG_PPC64 33#define get_accounting(tsk) (&get_paca()->accounting) 34#define raw_get_accounting(tsk) (&local_paca->accounting) 35static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 36 37#else 38#define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 39#define raw_get_accounting(tsk) get_accounting(tsk) 40/* 41 * Called from the context switch with interrupts disabled, to charge all 42 * accumulated times to the current process, and to prepare accounting on 43 * the next process. 44 */ 45static inline void arch_vtime_task_switch(struct task_struct *prev) 46{ 47 struct cpu_accounting_data *acct = get_accounting(current); 48 struct cpu_accounting_data *acct0 = get_accounting(prev); 49 50 acct->starttime = acct0->starttime; 51} 52#endif 53 54/* 55 * account_cpu_user_entry/exit runs "unreconciled", so can't trace, 56 * can't use get_paca() 57 */ 58static notrace inline void account_cpu_user_entry(void) 59{ 60 unsigned long tb = mftb(); 61 struct cpu_accounting_data *acct = raw_get_accounting(current); 62 63 acct->utime += (tb - acct->starttime_user); 64 acct->starttime = tb; 65} 66 67static notrace inline void account_cpu_user_exit(void) 68{ 69 unsigned long tb = mftb(); 70 struct cpu_accounting_data *acct = raw_get_accounting(current); 71 72 acct->stime += (tb - acct->starttime); 73 acct->starttime_user = tb; 74} 75 76static notrace inline void account_stolen_time(void) 77{ 78#ifdef CONFIG_PPC_SPLPAR 79 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 80 struct lppaca *lp = local_paca->lppaca_ptr; 81 82 if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx))) 83 pseries_accumulate_stolen_time(); 84 } 85#endif 86} 87 88#endif /* __KERNEL__ */ 89#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 90static inline void account_cpu_user_entry(void) 91{ 92} 93static inline void account_cpu_user_exit(void) 94{ 95} 96static notrace inline void account_stolen_time(void) 97{ 98} 99#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 100#endif /* __POWERPC_CPUTIME_H */ 101