linux-kernel - [PATCH] irqchip/gic-v3: Configure all interrupts as non-secure Group-1

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Message-Id: <1462875664-7059-1-git-send-email-marc.zyngier@arm.com>
Date:	Tue, 10 May 2016 11:21:04 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
Cc:	Peter Maydell <peter.maydell@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] irqchip/gic-v3: Configure all interrupts as non-secure Group-1

The GICv3 driver wrongly assumes that it runs on the non-secure
side of a secure-enabled system, while it could be on a system
with a single security state, or a GICv3 with GICD_CTLR.DS set.

Either way, it is important to configure this properly, or
interrupts will simply not be delivered on this HW.

Cc: stable@...r.kernel.org
Reported-by: Peter Maydell <peter.maydell@...aro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
It is getting a bit late for 4.6, so I plan to put this on top of
the 4.7 stuff, and let it trickle down to the stable trees (hence
the CC to stable).

Thanks,

	M.

 drivers/irqchip/irq-gic-v3.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index c3870a8..1a1ea4f 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -393,6 +393,15 @@ static void __init gic_dist_init(void)
 	writel_relaxed(0, base + GICD_CTLR);
 	gic_dist_wait_for_rwp();
 
+	/*
+	 * Configure SPIs as non-secure Group-1. This will only matter
+	 * if the GIC only has a single security state. This will not
+	 * do the right thing if the kernel is running in secure mode,
+	 * but that's not the intended use case anyway.
+	 */
+	for (i = 32; i < gic_data.irq_nr; i += 32)
+		writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
+
 	gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
 
 	/* Enable distributor with ARE, Group1 */
@@ -510,6 +519,9 @@ static void gic_cpu_init(void)
 
 	rbase = gic_data_rdist_sgi_base();
 
+	/* Configure SGIs/PPIs as non-secure Group-1 */
+	writel_relaxed(~0, rbase + GICR_IGROUPR0);
+
 	gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 
 	/* Give LPIs a spin */
-- 
2.1.4