add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/kernel/dbell.c
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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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  * Author: Kumar Gala <galak@kernel.crashing.org>
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  *
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  * Copyright 2009 Freescale Semiconductor Inc.
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- *
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- * This program is free software; you can redistribute  it and/or modify it
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- * under  the terms of  the GNU General  Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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  */
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 #include <linux/stddef.h>
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@@ -18,69 +14,16 @@
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 #include <asm/dbell.h>
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 #include <asm/irq_regs.h>
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 #include <asm/kvm_ppc.h>
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+#include <asm/trace.h>
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 #ifdef CONFIG_SMP
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-
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-/*
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- * Doorbells must only be used if CPU_FTR_DBELL is available.
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- * msgsnd is used in HV, and msgsndp is used in !HV.
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- *
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- * These should be used by platform code that is aware of restrictions.
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- * Other arch code should use ->cause_ipi.
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- *
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- * doorbell_global_ipi() sends a dbell to any target CPU.
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- * Must be used only by architectures that address msgsnd target
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- * by PIR/get_hard_smp_processor_id.
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- */
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-void doorbell_global_ipi(int cpu)
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-{
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-	u32 tag = get_hard_smp_processor_id(cpu);
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-
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-	kvmppc_set_host_ipi(cpu);
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-	/* Order previous accesses vs. msgsnd, which is treated as a store */
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-	ppc_msgsnd_sync();
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-	ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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-}
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-
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-/*
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- * doorbell_core_ipi() sends a dbell to a target CPU in the same core.
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- * Must be used only by architectures that address msgsnd target
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- * by TIR/cpu_thread_in_core.
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- */
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-void doorbell_core_ipi(int cpu)
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-{
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-	u32 tag = cpu_thread_in_core(cpu);
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-
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-	kvmppc_set_host_ipi(cpu);
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-	/* Order previous accesses vs. msgsnd, which is treated as a store */
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-	ppc_msgsnd_sync();
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-	ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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-}
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-
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-/*
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- * Attempt to cause a core doorbell if destination is on the same core.
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- * Returns 1 on success, 0 on failure.
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- */
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-int doorbell_try_core_ipi(int cpu)
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-{
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-	int this_cpu = get_cpu();
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-	int ret = 0;
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-
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-	if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) {
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-		doorbell_core_ipi(cpu);
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-		ret = 1;
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-	}
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-
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-	put_cpu();
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-
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-	return ret;
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-}
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 void doorbell_exception(struct pt_regs *regs)
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 {
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 	struct pt_regs *old_regs = set_irq_regs(regs);
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 	irq_enter();
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+	trace_doorbell_entry(regs);
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 	ppc_msgsync();
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..
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@@ -91,6 +34,7 @@
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 	smp_ipi_demux_relaxed(); /* already performed the barrier */
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+	trace_doorbell_exit(regs);
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 	irq_exit();
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 	set_irq_regs(old_regs);
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 }