linux-kernel - [PATCH v8 03/10] arm64: smp: Assign and setup an IPI as NMI

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Date:   Wed, 19 Apr 2023 15:55:57 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     ito-yuichi@...itsu.com, kgdb-bugreport@...ts.sourceforge.net,
        Chen-Yu Tsai <wens@...e.org>,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        linux-arm-kernel@...ts.infradead.org,
        Stephen Boyd <swboyd@...omium.org>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-perf-users@...r.kernel.org,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        Douglas Anderson <dianders@...omium.org>,
        Ben Dooks <ben-linux@...ff.org>,
        Pierre Gondois <Pierre.Gondois@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v8 03/10] arm64: smp: Assign and setup an IPI as NMI

From: Sumit Garg <sumit.garg@...aro.org>

Assign an unused IPI which can be turned as NMI using ipi_nmi framework.
Also, invoke corresponding dynamic IPI setup/teardown APIs.

Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
Reviewed-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Tested-by: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v8:
- dynamic_ipi_setup() and dynamic_ipi_teardown() no longer take cpu param

 arch/arm64/kernel/smp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 4e8327264255..94ff063527c6 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -43,6 +43,7 @@
 #include <asm/daifflags.h>
 #include <asm/kvm_mmu.h>
 #include <asm/mmu_context.h>
+#include <asm/nmi.h>
 #include <asm/numa.h>
 #include <asm/processor.h>
 #include <asm/smp_plat.h>
@@ -938,6 +939,8 @@ static void ipi_setup(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		enable_percpu_irq(ipi_irq_base + i, 0);
+
+	dynamic_ipi_setup();
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -950,6 +953,8 @@ static void ipi_teardown(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		disable_percpu_irq(ipi_irq_base + i);
+
+	dynamic_ipi_teardown();
 }
 #endif
 
@@ -971,6 +976,9 @@ void __init set_smp_ipi_range(int ipi_base, int n)
 		irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
 	}
 
+	if (n > nr_ipi)
+		set_smp_dynamic_ipi(ipi_base + nr_ipi);
+
 	ipi_irq_base = ipi_base;
 
 	/* Setup the boot CPU immediately */
-- 
2.40.0.634.g4ca3ef3211-goog