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Linux kernel mirror (for testing)
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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
23typedef u64 __nocast cputime_t;
24typedef 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 */
32extern u64 __cputime_usec_factor;
33
34static inline unsigned long cputime_to_usecs(const cputime_t ct)
35{
36 return mulhdu((__force u64) ct, __cputime_usec_factor);
37}
38
39/*
40 * PPC64 uses PACA which is task independent for storing accounting data while
41 * PPC32 uses struct thread_info, therefore at task switch the accounting data
42 * has to be populated in the new task
43 */
44#ifdef CONFIG_PPC64
45#define get_accounting(tsk) (&get_paca()->accounting)
46static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
47#else
48#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
49/*
50 * Called from the context switch with interrupts disabled, to charge all
51 * accumulated times to the current process, and to prepare accounting on
52 * the next process.
53 */
54static inline void arch_vtime_task_switch(struct task_struct *prev)
55{
56 struct cpu_accounting_data *acct = get_accounting(current);
57 struct cpu_accounting_data *acct0 = get_accounting(prev);
58
59 acct->starttime = acct0->starttime;
60}
61#endif
62
63#endif /* __KERNEL__ */
64#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
65#endif /* __POWERPC_CPUTIME_H */