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 typedef u64 __nocast cputime_t; 25 typedef u64 __nocast cputime64_t; 26 27 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) 28 29 #ifdef __KERNEL__ 30 /* 31 * Convert cputime <-> microseconds 32 */ 33 extern u64 __cputime_usec_factor; 34 35 static inline unsigned long cputime_to_usecs(const cputime_t ct) 36 { 37 return mulhdu((__force u64) ct, __cputime_usec_factor); 38 } 39 40 #define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime) 41 42 /* 43 * PPC64 uses PACA which is task independent for storing accounting data while 44 * PPC32 uses struct thread_info, therefore at task switch the accounting data 45 * has to be populated in the new task 46 */ 47 #ifdef CONFIG_PPC64 48 #define get_accounting(tsk) (&get_paca()->accounting) 49 #define raw_get_accounting(tsk) (&local_paca->accounting) 50 static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 51 52 #else 53 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 54 #define raw_get_accounting(tsk) get_accounting(tsk) 55 /* 56 * Called from the context switch with interrupts disabled, to charge all 57 * accumulated times to the current process, and to prepare accounting on 58 * the next process. 59 */ 60 static inline void arch_vtime_task_switch(struct task_struct *prev) 61 { 62 struct cpu_accounting_data *acct = get_accounting(current); 63 struct cpu_accounting_data *acct0 = get_accounting(prev); 64 65 acct->starttime = acct0->starttime; 66 } 67 #endif 68 69 /* 70 * account_cpu_user_entry/exit runs "unreconciled", so can't trace, 71 * can't use get_paca() 72 */ 73 static notrace inline void account_cpu_user_entry(void) 74 { 75 unsigned long tb = mftb(); 76 struct cpu_accounting_data *acct = raw_get_accounting(current); 77 78 acct->utime += (tb - acct->starttime_user); 79 acct->starttime = tb; 80 } 81 82 static notrace inline void account_cpu_user_exit(void) 83 { 84 unsigned long tb = mftb(); 85 struct cpu_accounting_data *acct = raw_get_accounting(current); 86 87 acct->stime += (tb - acct->starttime); 88 acct->starttime_user = tb; 89 } 90 91 static notrace inline void account_stolen_time(void) 92 { 93 #ifdef CONFIG_PPC_SPLPAR 94 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 95 struct lppaca *lp = local_paca->lppaca_ptr; 96 97 if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx))) 98 accumulate_stolen_time(); 99 } 100 #endif 101 } 102 103 #endif /* __KERNEL__ */ 104 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 105 static inline void account_cpu_user_entry(void) 106 { 107 } 108 static inline void account_cpu_user_exit(void) 109 { 110 } 111 static notrace inline void account_stolen_time(void) 112 { 113 } 114 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 115 #endif /* __POWERPC_CPUTIME_H */ 116