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From:   Sumit Garg <sumit.garg@linaro.org>
To:     maz@kernel.org, catalin.marinas@arm.com, will@kernel.org
Cc:     linux-arm-kernel@lists.infradead.org, tglx@linutronix.de,
        jason@lakedaemon.net, mark.rutland@arm.com,
        julien.thierry.kdev@gmail.com, dianders@chromium.org,
        daniel.thompson@linaro.org, jason.wessel@windriver.com,
        msys.mizuma@gmail.com, ito-yuichi@fujitsu.com,
        kgdb-bugreport@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        Sumit Garg <sumit.garg@linaro.org>
Subject: [PATCH v5 3/5] arm64: smp: Allocate and setup IPI as NMI
Date:   Wed, 14 Oct 2020 16:42:09 +0530
Message-Id: <1602673931-28782-4-git-send-email-sumit.garg@linaro.org>
In-Reply-To: <1602673931-28782-1-git-send-email-sumit.garg@linaro.org>
References: <1602673931-28782-1-git-send-email-sumit.garg@linaro.org>
Precedence: bulk

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

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
 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 82e75fc..129ebfb 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>
@@ -962,6 +963,8 @@ static void ipi_setup(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		enable_percpu_irq(ipi_irq_base + i, 0);
+
+	ipi_nmi_setup(cpu);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -974,6 +977,8 @@ static void ipi_teardown(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		disable_percpu_irq(ipi_irq_base + i);
+
+	ipi_nmi_teardown(cpu);
 }
 #endif
 
@@ -995,6 +1000,9 @@ 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_ipi_nmi(ipi_base + nr_ipi);
+
 	ipi_irq_base = ipi_base;
 
 	/* Setup the boot CPU immediately */
-- 
2.7.4