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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Definitions for measuring cputime on powerpc machines.
*
* Copyright (C) 2006 Paul Mackerras, IBM Corp.
*
* If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
* the same units as the timebase. Otherwise we measure cpu time
* in jiffies using the generic definitions.
*/
#ifndef __POWERPC_CPUTIME_H
#define __POWERPC_CPUTIME_H
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
#include <linux/types.h>
#include <linux/time.h>
#include <asm/div64.h>
#include <asm/time.h>
#include <asm/param.h>
#include <asm/firmware.h>
#ifdef __KERNEL__
#define cputime_to_nsecs(cputime) tb_to_ns(cputime)
/*
* PPC64 uses PACA which is task independent for storing accounting data while
* PPC32 uses struct thread_info, therefore at task switch the accounting data
* has to be populated in the new task
*/
#ifdef CONFIG_PPC64
#define get_accounting(tsk) (&get_paca()->accounting)
#define raw_get_accounting(tsk) (&local_paca->accounting)
static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
#else
#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
#define raw_get_accounting(tsk) get_accounting(tsk)
/*
* Called from the context switch with interrupts disabled, to charge all
* accumulated times to the current process, and to prepare accounting on
* the next process.
*/
static inline void arch_vtime_task_switch(struct task_struct *prev)
{
struct cpu_accounting_data *acct = get_accounting(current);
struct cpu_accounting_data *acct0 = get_accounting(prev);
acct->starttime = acct0->starttime;
}
#endif
/*
* account_cpu_user_entry/exit runs "unreconciled", so can't trace,
* can't use get_paca()
*/
static notrace inline void account_cpu_user_entry(void)
{
unsigned long tb = mftb();
struct cpu_accounting_data *acct = raw_get_accounting(current);
acct->utime += (tb - acct->starttime_user);
acct->starttime = tb;
}
static notrace inline void account_cpu_user_exit(void)
{
unsigned long tb = mftb();
struct cpu_accounting_data *acct = raw_get_accounting(current);
acct->stime += (tb - acct->starttime);
acct->starttime_user = tb;
}
static notrace inline void account_stolen_time(void)
{
#ifdef CONFIG_PPC_SPLPAR
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
struct lppaca *lp = local_paca->lppaca_ptr;
if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
pseries_accumulate_stolen_time();
}
#endif
}
#endif /* __KERNEL__ */
#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
static inline void account_cpu_user_entry(void)
{
}
static inline void account_cpu_user_exit(void)
{
}
static notrace inline void account_stolen_time(void)
{
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
#endif /* __POWERPC_CPUTIME_H */
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