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 #define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime) 40 41 /* 42 * PPC64 uses PACA which is task independent for storing accounting data while 43 * PPC32 uses struct thread_info, therefore at task switch the accounting data 44 * has to be populated in the new task 45 */ 46 #ifdef CONFIG_PPC64 47 #define get_accounting(tsk) (&get_paca()->accounting) 48 #define raw_get_accounting(tsk) (&local_paca->accounting) 49 static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 50 51 #else 52 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 53 #define raw_get_accounting(tsk) get_accounting(tsk) 54 /* 55 * Called from the context switch with interrupts disabled, to charge all 56 * accumulated times to the current process, and to prepare accounting on 57 * the next process. 58 */ 59 static inline void arch_vtime_task_switch(struct task_struct *prev) 60 { 61 struct cpu_accounting_data *acct = get_accounting(current); 62 struct cpu_accounting_data *acct0 = get_accounting(prev); 63 64 acct->starttime = acct0->starttime; 65 } 66 #endif 67 68 /* 69 * account_cpu_user_entry/exit runs "unreconciled", so can't trace, 70 * can't use get_paca() 71 */ 72 static notrace inline void account_cpu_user_entry(void) 73 { 74 unsigned long tb = mftb(); 75 struct cpu_accounting_data *acct = raw_get_accounting(current); 76 77 acct->utime += (tb - acct->starttime_user); 78 acct->starttime = tb; 79 } 80 81 static notrace inline void account_cpu_user_exit(void) 82 { 83 unsigned long tb = mftb(); 84 struct cpu_accounting_data *acct = raw_get_accounting(current); 85 86 acct->stime += (tb - acct->starttime); 87 acct->starttime_user = tb; 88 } 89 90 static notrace inline void account_stolen_time(void) 91 { 92 #ifdef CONFIG_PPC_SPLPAR 93 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 94 struct lppaca *lp = local_paca->lppaca_ptr; 95 96 if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx))) 97 accumulate_stolen_time(); 98 } 99 #endif 100 } 101 102 #endif /* __KERNEL__ */ 103 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 104 static inline void account_cpu_user_entry(void) 105 { 106 } 107 static inline void account_cpu_user_exit(void) 108 { 109 } 110 static notrace inline void account_stolen_time(void) 111 { 112 } 113 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 114 #endif /* __POWERPC_CPUTIME_H */ 115