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From:   Douglas Anderson <dianders@chromium.org>
To:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Sumit Garg <sumit.garg@linaro.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Marc Zyngier <maz@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
Cc:     ito-yuichi@fujitsu.com, kgdb-bugreport@lists.sourceforge.net,
        Chen-Yu Tsai <wens@csie.org>,
        Masayoshi Mizuma <msys.mizuma@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        linux-arm-kernel@lists.infradead.org,
        Stephen Boyd <swboyd@chromium.org>,
        Lecopzer Chen <lecopzer.chen@mediatek.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-perf-users@vger.kernel.org,
        Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>,
        Douglas Anderson <dianders@chromium.org>,
        Ben Dooks <ben-linux@fluff.org>,
        Pierre Gondois <Pierre.Gondois@arm.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v8 03/10] arm64: smp: Assign and setup an IPI as NMI
Date:   Wed, 19 Apr 2023 15:55:57 -0700
Message-ID: <20230419155341.v8.3.I6d7f7d5fa0aa293c8c3374194947254b93114d37@changeid>
In-Reply-To: <20230419225604.21204-1-dianders@chromium.org>
References: <20230419225604.21204-1-dianders@chromium.org>
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From: Sumit Garg <sumit.garg@linaro.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@linaro.org>
Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Tested-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Douglas Anderson <dianders@chromium.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