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) 35 static 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 */ 45 static 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 */ 58 static 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 67 static 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 76 static 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 */ 90 static inline void account_cpu_user_entry(void) 91 { 92 } 93 static inline void account_cpu_user_exit(void) 94 { 95 } 96 static notrace inline void account_stolen_time(void) 97 { 98 } 99 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 100 #endif /* __POWERPC_CPUTIME_H */ 101