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From: Sumit Garg <sumit.garg@linaro.org>
To: maz@kernel.org, catalin.marinas@arm.com, will@kernel.org
Cc: mark.rutland@arm.com, Sumit Garg <sumit.garg@linaro.org>,
	daniel.thompson@linaro.org, jason@lakedaemon.net,
	kgdb-bugreport@lists.sourceforge.net, dianders@chromium.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, jason.wessel@windriver.com,
	tglx@linutronix.de, julien.thierry.kdev@gmail.com
Subject: [PATCH v4 2/5] irqchip/gic-v3: Enable support for SGIs to act as NMIs
Date: Fri, 11 Sep 2020 18:58:41 +0530	[thread overview]
Message-ID: <1599830924-13990-3-git-send-email-sumit.garg@linaro.org> (raw)
In-Reply-To: <1599830924-13990-1-git-send-email-sumit.garg@linaro.org>

Add support to handle SGIs as regular NMIs. As SGIs or IPIs defaults to a
special flow handler: handle_percpu_devid_fasteoi_ipi(), so skip NMI
handler update in case of SGIs.

Also, enable NMI support prior to gic_smp_init() as allocation of SGIs
as IRQs/NMIs happen as part of this routine.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
 drivers/irqchip/irq-gic-v3.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 7170645..dfd8e03 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -476,6 +476,11 @@ static int gic_irq_nmi_setup(struct irq_data *d)
 	if (WARN_ON(gic_irq(d) >= 8192))
 		return -EINVAL;
 
+	if (get_intid_range(d) == SGI_RANGE) {
+		gic_irq_set_prio(d, GICD_INT_NMI_PRI);
+		return 0;
+	}
+
 	/* desc lock should already be held */
 	if (gic_irq_in_rdist(d)) {
 		u32 idx = gic_get_ppi_index(d);
@@ -513,6 +518,11 @@ static void gic_irq_nmi_teardown(struct irq_data *d)
 	if (WARN_ON(gic_irq(d) >= 8192))
 		return;
 
+	if (get_intid_range(d) == SGI_RANGE) {
+		gic_irq_set_prio(d, GICD_INT_DEF_PRI);
+		return;
+	}
+
 	/* desc lock should already be held */
 	if (gic_irq_in_rdist(d)) {
 		u32 idx = gic_get_ppi_index(d);
@@ -1666,6 +1676,7 @@ static int __init gic_init_bases(void __iomem *dist_base,
 
 	gic_dist_init();
 	gic_cpu_init();
+	gic_enable_nmi_support();
 	gic_smp_init();
 	gic_cpu_pm_init();
 
@@ -1677,8 +1688,6 @@ static int __init gic_init_bases(void __iomem *dist_base,
 			gicv2m_init(handle, gic_data.domain);
 	}
 
-	gic_enable_nmi_support();
-
 	return 0;
 
 out_free:
-- 
2.7.4


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  parent reply	other threads:[~2020-09-11 13:33 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-11 13:28 [PATCH v4 0/5] arm64: Add framework to turn an IPI as NMI Sumit Garg
2020-09-11 13:28 ` [PATCH v4 1/5] arm64: Add framework to turn " Sumit Garg
2020-10-10  1:58   ` Masayoshi Mizuma
2020-10-10  9:34     ` Marc Zyngier
2020-10-10 15:13       ` Masayoshi Mizuma
2020-10-12 12:19         ` Sumit Garg
2020-10-13  3:23           ` Masayoshi Mizuma
2020-10-12 12:21     ` Sumit Garg
2020-09-11 13:28 ` Sumit Garg [this message]
2020-09-11 13:28 ` [PATCH v4 3/5] arm64: smp: Allocate and setup " Sumit Garg
2020-09-11 13:28 ` [PATCH v4 4/5] arm64: kgdb: Round up cpus using " Sumit Garg
2020-09-11 13:28 ` [PATCH v4 5/5] arm64: ipi_nmi: Add support for NMI backtrace Sumit Garg

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