linux-kernel - Re: [PATCH v2 0/5] irqchip/gic-v3: Disable pseudo NMIs on Mediatek Chromebooks w/ bad FW

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Date:   Mon, 29 May 2023 17:41:56 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Marc Zyngier <maz@...nel.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        Eddie Huang <eddie.huang@...iatek.com>,
        Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, wenst@...omium.org,
        yidilin@...omium.org, Tinghan Shen <tinghan.shen@...iatek.com>,
        jwerner@...omium.org, Weiyi Lu <weiyi.lu@...iatek.com>,
        Ben Ho <Ben.Ho@...iatek.com>,
        Seiya Wang <seiya.wang@...iatek.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Enric Balletbo i Serra <eballetbo@...nel.org>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] irqchip/gic-v3: Disable pseudo NMIs on Mediatek
 Chromebooks w/ bad FW



On 16/05/2023 11:58, Marc Zyngier wrote:
> On Mon, 15 May 2023 21:13:49 +0100,
> Douglas Anderson <dianders@...omium.org> wrote:
>>
>> As talked about in the bindings patch included in this series
>> ("dt-bindings: interrupt-controller: arm,gic-v3: Add quirk for
>> Mediatek SoCs w/ broken FW"), many Mediatek-based Chromebooks shipped
>> with firmware that doesn't properly save/restore some GICR
>> registers. This causes the system to crash if "pseudo NMIs" are turned
>> on.
>>
>> This series makes sure that we never allow turning on "pseudo NMIs" if
>> we are running with the problematic firmware.
>>
>> The patches in this series can land in any order and can go through
>> entirely different trees. None of the patches are harmful on their
>> own, but to get things fixed we need all of them.
>>
>> v2 fixes the quirk name and also moves the quirk out of the SoC.dtsi
>> file and into the Chromebook file. This, unfortunately, means that
>> mt8186-based Chromebooks are no longer handled since they don't appear
>> to be upstream yet. :(
>>
>> Changes in v2:
>> - "when CPUs are powered" => "when the GIC redistributors are..."
>> - Changed "Fixes" tag.
>> - Moved from mt8183.dtsi to mt8183-kukui.dtsi
>> - Moved from mt8192.dtsi to mt8192-asurada.dtsi
>> - Moved from mt8195.dtsi to mt8195-cherry.dtsi
>> - mediatek,gicr-save-quirk => mediatek,broken-save-restore-fw
>>
>> Douglas Anderson (5):
>>    dt-bindings: interrupt-controller: arm,gic-v3: Add quirk for Mediatek
>>      SoCs w/ broken FW
>>    irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ firmware
>>      issues
>>    arm64: dts: mediatek: mt8183: Add mediatek,broken-save-restore-fw to
>>      kukui
>>    arm64: dts: mediatek: mt8192: Add mediatek,broken-save-restore-fw to
>>      asurada
>>    arm64: dts: mediatek: mt8195: Add mediatek,broken-save-restore-fw to
>>      cherry
>>
>>   .../interrupt-controller/arm,gic-v3.yaml      |  6 ++++++
>>   .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |  4 ++++
>>   .../boot/dts/mediatek/mt8192-asurada.dtsi     |  4 ++++
>>   .../boot/dts/mediatek/mt8195-cherry.dtsi      |  4 ++++
>>   drivers/irqchip/irq-gic-common.c              |  8 ++++++--
>>   drivers/irqchip/irq-gic-common.h              |  1 +
>>   drivers/irqchip/irq-gic-v3.c                  | 20 +++++++++++++++++++
>>   7 files changed, 45 insertions(+), 2 deletions(-)
> 
> I'll take the first two patches as fixes. The rest can be merged via
> the soc tree as required.
> 
> 	M.
> 

Patches 3-5 applied now. Thanks!