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From:   Zenghui Yu <yuzenghui@huawei.com>
To:     <maz@kernel.org>
CC:     <tglx@linutronix.de>, <jason@lakedaemon.net>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <wanghaibin.wang@huawei.com>, Zenghui Yu <yuzenghui@huawei.com>
Subject: [PATCH] irqchip/gic-v3: Fix GIC_LINE_NR accessor
Date:   Wed, 18 Sep 2019 06:57:30 +0000
Message-ID: <1568789850-14080-1-git-send-email-yuzenghui@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
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As per GIC spec, ITLinesNumber indicates the maximum SPI INTID that
the GIC implementation supports. And the maximum SPI INTID an
implementation might support is 1019 (field value 11111).

max(GICD_TYPER_SPIS(...), 1020) is not what we actually want for
GIC_LINE_NR. Fix it to min(GICD_TYPER_SPIS(...), 1020).

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
---

Hi Marc,

I still see "GICv3: 992 SPIs implemented" on the host. I go back to
https://patchwork.kernel.org/patch/11078623/ and it seems that we
failed to make the GIC_LINE_NR correct at that time.

 drivers/irqchip/irq-gic-v3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 7b0c96b9e02f..f4a49aef5ca4 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -59,7 +59,7 @@ static struct gic_chip_data gic_data __read_mostly;
 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
 
 #define GIC_ID_NR	(1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
-#define GIC_LINE_NR	max(GICD_TYPER_SPIS(gic_data.rdists.gicd_typer), 1020U)
+#define GIC_LINE_NR	min(GICD_TYPER_SPIS(gic_data.rdists.gicd_typer), 1020U)
 #define GIC_ESPI_NR	GICD_TYPER_ESPIS(gic_data.rdists.gicd_typer)
 
 /*
-- 
2.19.1