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

From: Marc Zyngier <[email-masked]>
Date: Tue, 16 May 2023 10:58:24 +0100

On Mon, 15 May 2023 21:13:49 +0100,
Douglas Anderson <[email-masked]> 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.

-- 
Without deviation from the norm, progress is not possible.

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