89d6910cc5
The generic vtime_task_switch() implementation gets built only if __ARCH_HAS_VTIME_TASK_SWITCH is not defined, but requires an architecture to implement arch_vtime_task_switch() callback at the same time, which is confusing. Further, arch_vtime_task_switch() is implemented for 32-bit PowerPC architecture only and vtime_task_switch() generic variant is rather superfluous. Simplify the whole vtime_task_switch() wiring by moving the existing generic implementation to PowerPC. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2cb6e3caada93623f6d4f78ad938ac6cd0e2fda8.1712760275.git.agordeev@linux.ibm.com
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Definitions for measuring cputime on powerpc machines.
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*
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* Copyright (C) 2006 Paul Mackerras, IBM Corp.
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*
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* If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
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* the same units as the timebase. Otherwise we measure cpu time
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* in jiffies using the generic definitions.
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*/
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#ifndef __POWERPC_CPUTIME_H
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#define __POWERPC_CPUTIME_H
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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#include <linux/types.h>
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#include <linux/time.h>
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#include <asm/div64.h>
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#include <asm/time.h>
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#include <asm/param.h>
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#include <asm/firmware.h>
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#ifdef __KERNEL__
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#define cputime_to_nsecs(cputime) tb_to_ns(cputime)
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/*
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* PPC64 uses PACA which is task independent for storing accounting data while
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* PPC32 uses struct thread_info, therefore at task switch the accounting data
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* has to be populated in the new task
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*/
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#ifdef CONFIG_PPC64
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#define get_accounting(tsk) (&get_paca()->accounting)
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#define raw_get_accounting(tsk) (&local_paca->accounting)
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#else
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#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
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#define raw_get_accounting(tsk) get_accounting(tsk)
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#endif
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/*
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* account_cpu_user_entry/exit runs "unreconciled", so can't trace,
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* can't use get_paca()
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*/
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static notrace inline void account_cpu_user_entry(void)
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{
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unsigned long tb = mftb();
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struct cpu_accounting_data *acct = raw_get_accounting(current);
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acct->utime += (tb - acct->starttime_user);
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acct->starttime = tb;
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}
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static notrace inline void account_cpu_user_exit(void)
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{
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unsigned long tb = mftb();
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struct cpu_accounting_data *acct = raw_get_accounting(current);
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acct->stime += (tb - acct->starttime);
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acct->starttime_user = tb;
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}
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static notrace inline void account_stolen_time(void)
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{
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#ifdef CONFIG_PPC_SPLPAR
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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struct lppaca *lp = local_paca->lppaca_ptr;
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if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
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pseries_accumulate_stolen_time();
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}
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#endif
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}
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#endif /* __KERNEL__ */
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#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
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static inline void account_cpu_user_entry(void)
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{
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}
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static inline void account_cpu_user_exit(void)
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{
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}
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static notrace inline void account_stolen_time(void)
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{
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}
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
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#endif /* __POWERPC_CPUTIME_H */
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