add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/include/asm/cputime.h
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@@ -1,12 +1,8 @@
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+/* 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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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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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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@@ -40,6 +36,8 @@
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 	return mulhdu((__force u64) ct, __cputime_usec_factor);
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 }
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+#define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime)
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+
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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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@@ -47,9 +45,12 @@
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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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 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
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+
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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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 /*
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  * Called from the context switch with interrupts disabled, to charge all
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  * accumulated times to the current process, and to prepare accounting on
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@@ -61,10 +62,39 @@
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 	struct cpu_accounting_data *acct0 = get_accounting(prev);
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 	acct->starttime = acct0->starttime;
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-	acct->startspurr = acct0->startspurr;
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 }
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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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+
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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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+
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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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+
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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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+
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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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 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
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 #endif /* __POWERPC_CPUTIME_H */