linux-kernel - [PATCH] irqchip/gic-v3: Fix GIC_LINE

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Date:   Wed, 18 Sep 2019 06:57:30 +0000
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <maz@...nel.org>
CC:     <tglx@...utronix.de>, <jason@...edaemon.net>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <wanghaibin.wang@...wei.com>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] irqchip/gic-v3: Fix GIC_LINE_NR accessor

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@...wei.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