linux-kernel - Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard interrupts

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Date:   Mon, 14 Sep 2020 15:06:00 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Sumit Garg <sumit.garg@...aro.org>,
        Valentin Schneider <Valentin.Schneider@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Saravana Kannan <saravanak@...gle.com>,
        kernel-team@...roid.com,
        'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard
 interrupts

Hi Marc,

On 01.09.2020 16:43, Marc Zyngier wrote:
> Change the way we deal with GIC SGIs by turning them into proper
> IRQs, and calling into the arch code to register the interrupt range
> instead of a callback.
>
> Reviewed-by: Valentin Schneider <valentin.schneider@....com>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
This patch landed in linux next-20200914 as commit ac063232d4b0 
("irqchip/gic: Configure SGIs as standard interrupts"). Sadly it breaks 
booting of all Samsung Exynos 4210/4412 based boards (dual/quad ARM 
Cortex A9 based). Here are the last lines from the bootlog:

[    0.106322] CPU: Testing write buffer coherency: ok
[    0.109895] CPU0: Spectre v2: using BPIALL workaround
[    0.116057] CPU0: thread -1, cpu 0, socket 9, mpidr 80000900
[    0.123885] Setting up static identity map for 0x40100000 - 0x40100060
[    0.130191] rcu: Hierarchical SRCU implementation.
[    0.137195] soc soc0: Exynos: CPU[EXYNOS4210] PRO_ID[0x43210211] 
REV[0x11] Detected
[    0.145129] smp: Bringing up secondary CPUs ...
[    0.156279] CPU1: thread -1, cpu 1, socket 9, mpidr 80000901
[    0.156291] CPU1: Spectre v2: using BPIALL workaround
[    2.716379] random: fast init done

> ---
>   drivers/irqchip/irq-gic.c | 103 +++++++++++++++++++++++---------------
>   1 file changed, 63 insertions(+), 40 deletions(-)
>
> ...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland