linux-kernel - [PATCH 08/10] irqchip/gic-v3-its: Check that all RDs have the same property table

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Message-Id: <20180921195954.21574-9-marc.zyngier@arm.com>
Date:   Fri, 21 Sep 2018 20:59:52 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 08/10] irqchip/gic-v3-its: Check that all RDs have the same property table

If booting with LPIs enabled, all the redistributors must have the
exact same property table. No ifs, no buts.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 drivers/irqchip/irq-gic-v3-its.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0b3e76cdde26..4d9604dd6fb1 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2029,6 +2029,15 @@ static void its_cpu_init_lpis(void)
 	val = readl_relaxed(rbase + GICR_CTLR);
 	if ((gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) &&
 	    (val & GICR_CTLR_ENABLE_LPIS)) {
+		/*
+		 * Check that we get the same property table on all
+		 * RDs. If we don't, this is hopeless.
+		 */
+		paddr = gicr_read_propbaser(rbase + GICR_PROPBASER);
+		paddr &= GENMASK_ULL(51, 12);
+		if (WARN_ON(gic_rdists->prop_table_pa != paddr))
+			add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
+
 		paddr = gicr_read_pendbaser(rbase + GICR_PENDBASER);
 		paddr &= GENMASK_ULL(51, 16);
 
-- 
2.18.0