linux-kernel - [RFC Patch v1 3/4] irqchip/gic-v3: Enable arch specific IPI as pseudo NMI

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Date:   Fri, 24 Apr 2020 16:39:13 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        jason@...edaemon.net, maz@...nel.org,
        julien.thierry.kdev@...il.com, dianders@...omium.org,
        daniel.thompson@...aro.org, jason.wessel@...driver.com,
        kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>
Subject: [RFC Patch v1 3/4] irqchip/gic-v3: Enable arch specific IPI as pseudo NMI

Add support to mark arch specific IPI as pseudo NMI. Currently its used
to allows arm64 specific IPI_CALL_NMI_FUNC to be marked as pseudo NMI.

Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
---
 arch/arm64/kernel/smp.c      |  5 +++++
 drivers/irqchip/irq-gic-v3.c | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 42fe7bb..27c8ee1 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -802,6 +802,11 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
 	S(IPI_CALL_NMI_FUNC, "NMI function call interrupts"),
 };
 
+int arch_get_ipinr_nmi(void)
+{
+	return IPI_CALL_NMI_FUNC;
+}
+
 static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
 {
 	trace_ipi_raise(target, ipi_types[ipinr]);
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index be361bf..a3d2cf3 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1048,6 +1048,11 @@ static int gic_dist_supports_lpis(void)
 		!gicv3_nolpi);
 }
 
+int __weak arch_get_ipinr_nmi(void)
+{
+	return -1;
+}
+
 static void gic_cpu_init(void)
 {
 	void __iomem *rbase;
@@ -1072,6 +1077,15 @@ static void gic_cpu_init(void)
 
 	gic_cpu_config(rbase, gic_data.ppi_nr + 16, gic_redist_wait_for_rwp);
 
+	if (gic_supports_nmi()) {
+		int ipinr;
+
+		ipinr = arch_get_ipinr_nmi();
+		if (ipinr >= 0 && ipinr < 16)
+			writeb_relaxed(GICD_INT_NMI_PRI,
+				       rbase + GICD_IPRIORITYR + ipinr);
+	}
+
 	/* initialise system registers */
 	gic_cpu_sys_reg_init();
 }
-- 
2.7.4