linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: monaco: Add EL2 overlay

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Message-ID: <rf7lfuuc4tmdupmyi3bex7vjmst7ggai7lcnflwbhxefxbcs2m@ih6ic3grcm5q>
Date: Fri, 23 Jan 2026 20:09:40 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: monaco: Add EL2 overlay

On Fri, Jan 23, 2026 at 04:05:02PM +0530, Mukesh Ojha wrote:
> All the Monaco IOT variants boards are using Gunyah hypervisor which
> means that, so far, Linux-based OS could only boot in EL1 on those
> devices.  However, it is possible for us to boot Linux at EL2 on these
> devices [1].
> 
> When running under Gunyah, the remote processor firmware IOMMU streams
> are controlled by Gunyah. However, without Gunyah, the IOMMU is managed
> by the consumer of this DeviceTree. Therefore, describe the firmware
> streams for each remote processor.
> 
> Add a EL2-specific DT overlay and apply it to Monaco IOT variant
> devices to create -el2.dtb for each of them alongside "normal" dtb.
> 
> [1]
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
> 
> Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile        |  8 ++++++
>  arch/arm64/boot/dts/qcom/monaco-el2.dtso | 32 ++++++++++++++++++++++++
>  2 files changed, 40 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/monaco-el2.dtso
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index f80b5d9cf1e8..cbf7d89e432c 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -45,6 +45,10 @@ lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo
>  dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-el2.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= milos-fairphone-fp6.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk.dtb
> +
> +monaco-evk-el2-dtbs := monaco-evk.dtb monaco-el2.dtbo
> +
> +dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-el2.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8216-samsung-fortuna3g.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-acer-a1-724.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-alcatel-idol347.dtb
> @@ -147,6 +151,10 @@ dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-industrial-mezzanine.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-vision-mezzanine.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-thundercomm-rubikpi3.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride.dtb
> +
> +qcs8300-ride-el2-dtbs := qcs8300-ride.dtb monaco-el2.dtbo
> +
> +dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride-el2.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs8550-aim300-aiot.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-r3.dtb
> diff --git a/arch/arm64/boot/dts/qcom/monaco-el2.dtso b/arch/arm64/boot/dts/qcom/monaco-el2.dtso
> new file mode 100644
> index 000000000000..be08829a6b2f
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/monaco-el2.dtso
> @@ -0,0 +1,32 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +/*
> + * Monaco specific modifications required to boot in EL2.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +/* We can't and don't need to use zap shader in EL2 as linux can zap the gpu on it's own. */
> +&gpu_zap_shader {
> +	status = "disabled";
> +};
> +
> +&iris {
> +	status = "disabled";
> +};
> +
> +&remoteproc_gpdsp {
> +	iommus = <&apps_smmu 0x28a0 0x0>;
> +};
> +
> +&remoteproc_adsp {

Sorting order...

> +	iommus = <&apps_smmu 0x2000 0x0>;
> +};
> +
> +&remoteproc_cdsp {
> +	iommus = <&apps_smmu 0x19c0 0x0400>;
> +};
> -- 
> 2.50.1
> 

-- 
With best wishes
Dmitry