linux-kernel - [PATCH 1/5] irqchip/gic-v4.1: Fix programming of GICR_VPROPBASER_4_1

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Date:   Tue, 4 Feb 2020 17:09:36 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <maz@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <wanghaibin.wang@...wei.com>,
        Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH 1/5] irqchip/gic-v4.1: Fix programming of GICR_VPROPBASER_4_1_SIZE

The Size field of GICv4.1 VPROPBASER register indicates number of
pages minus one and together Page_Size and Size control the vPEID
width. Let's respect this requirement of the architecture.

Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index e5a25d97f8db..992bc72cab6f 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2531,7 +2531,7 @@ static int allocate_vpe_l1_table(void)
 		npg = 1;
 	}
 
-	val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, npg);
+	val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, npg - 1);
 
 	/* Right, that's the number of CPU pages we need for L1 */
 	np = DIV_ROUND_UP(npg * psz, PAGE_SIZE);
-- 
2.19.1