1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Definitions for measuring cputime on powerpc machines.
5 * Copyright (C) 2006 Paul Mackerras, IBM Corp.
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.
12 #ifndef __POWERPC_CPUTIME_H
13 #define __POWERPC_CPUTIME_H
15 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
17 #include <linux/types.h>
18 #include <linux/time.h>
19 #include <asm/div64.h>
21 #include <asm/param.h>
23 typedef u64 __nocast cputime_t;
24 typedef u64 __nocast cputime64_t;
26 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
30 * Convert cputime <-> microseconds
32 extern u64 __cputime_usec_factor;
34 static inline unsigned long cputime_to_usecs(const cputime_t ct)
36 return mulhdu((__force u64) ct, __cputime_usec_factor);
39 #define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime)
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
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) { }
52 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
53 #define raw_get_accounting(tsk) get_accounting(tsk)
55 * Called from the context switch with interrupts disabled, to charge all
56 * accumulated times to the current process, and to prepare accounting on
59 static inline void arch_vtime_task_switch(struct task_struct *prev)
61 struct cpu_accounting_data *acct = get_accounting(current);
62 struct cpu_accounting_data *acct0 = get_accounting(prev);
64 acct->starttime = acct0->starttime;
69 * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
70 * can't use get_paca()
72 static notrace inline void account_cpu_user_entry(void)
74 unsigned long tb = mftb();
75 struct cpu_accounting_data *acct = raw_get_accounting(current);
77 acct->utime += (tb - acct->starttime_user);
81 static notrace inline void account_cpu_user_exit(void)
83 unsigned long tb = mftb();
84 struct cpu_accounting_data *acct = raw_get_accounting(current);
86 acct->stime += (tb - acct->starttime);
87 acct->starttime_user = tb;
90 static notrace inline void account_stolen_time(void)
92 #ifdef CONFIG_PPC_SPLPAR
93 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
94 struct lppaca *lp = local_paca->lppaca_ptr;
96 if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
97 accumulate_stolen_time();
102 #endif /* __KERNEL__ */
103 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
104 static inline void account_cpu_user_entry(void)
107 static inline void account_cpu_user_exit(void)
110 static notrace inline void account_stolen_time(void)
113 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
114 #endif /* __POWERPC_CPUTIME_H */