On 9/22/2025 1:51 PM, Stephan Gerhold wrote: > On Sun, Sep 21, 2025 at 01:11:10AM +0530, Mukesh Ojha wrote: >> All the Lemans 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, remote processor firmware IOMMU streams is >> controlled by the Gunyah however when Linux take ownership of it in EL2, >> It need to configure it properly to use remote processor. >> >> Add a EL2-specific DT overlay and apply it to Lemans 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 <[email protected]> >> --- >> arch/arm64/boot/dts/qcom/Makefile | 7 ++++++- >> arch/arm64/boot/dts/qcom/lemans-el2.dtso | 28 ++++++++++++++++++++++++++++ >> 2 files changed, 34 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm64/boot/dts/qcom/Makefile >> b/arch/arm64/boot/dts/qcom/Makefile >> index 296688f7cb26..e2eb6c4f8e25 100644 >> --- a/arch/arm64/boot/dts/qcom/Makefile >> +++ b/arch/arm64/boot/dts/qcom/Makefile >> @@ -35,6 +35,8 @@ dtb-$(CONFIG_ARCH_QCOM) += lemans-evk.dtb >> lemans-evk-camera-csi1-imx577-dtbs := lemans-evk.dtb >> lemans-evk-camera-csi1-imx577.dtbo >> >> dtb-$(CONFIG_ARCH_QCOM) += lemans-evk-camera-csi1-imx577.dtb >> +lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo >> +dtb-$(CONFIG_ARCH_QCOM) += lemans-evk-el2.dtb >> dtb-$(CONFIG_ARCH_QCOM) += monaco-evk.dtb >> dtb-$(CONFIG_ARCH_QCOM) += msm8216-samsung-fortuna3g.dtb >> dtb-$(CONFIG_ARCH_QCOM) += msm8916-acer-a1-724.dtb >> @@ -136,7 +138,10 @@ dtb-$(CONFIG_ARCH_QCOM) += >> qcs6490-rb3gen2-vision-mezzanine.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qcs8300-ride.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qcs8550-aim300-aiot.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride.dtb >> -dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride-r3.dtb >> +qcs9100-ride-el2-dtbs := qcs9100-ride.dtb lemans-el2.dtbo >> +dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride.dtb qcs9100-ride-el2.dtb >> +qcs9100-ride-r3-el2-dtbs := qcs9100-ride-r3.dtb lemans-el2.dtbo >> +dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride-r3.dtb qcs9100-ride-r3-el2.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qdu1000-idp.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qrb2210-rb1.dtb >> dtb-$(CONFIG_ARCH_QCOM) += qrb4210-rb2.dtb >> diff --git a/arch/arm64/boot/dts/qcom/lemans-el2.dtso >> b/arch/arm64/boot/dts/qcom/lemans-el2.dtso >> new file mode 100644 >> index 000000000000..55a2a9e2b10d >> --- /dev/null >> +++ b/arch/arm64/boot/dts/qcom/lemans-el2.dtso >> @@ -0,0 +1,28 @@ >> +// SPDX-License-Identifier: BSD-3-Clause >> +/* >> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. >> + */ >> + >> +/* >> + * Lemans specific modifications required to boot in EL2. >> + */ >> + >> +/dts-v1/; >> +/plugin/; >> + >> +/* >> + * When running under Gunyah, remote processor firmware IOMMU streams is >> + * controlled by the Gunyah however when we take ownership of it in EL2, >> + * we need to configure it properly to use remote processor. >> + */ >> +&remoteproc_adsp { >> + iommus = <&apps_smmu 0x3000 0x0>; >> +}; >> + >> +&remoteproc_cdsp0 { >> + iommus = <&apps_smmu 0x21c0 0x0400>; >> +}; >> + >> +&remoteproc_cdsp1 { >> + iommus = <&apps_smmu 0x29c0 0x0400>; >> +}; >> > > Would be good to disable &iris here for now similar to > https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=c0f045e303e014cec5d883edf82fe5de74769944 > (I'm assuming it is broken without specifying the iommus?) > > What about GPU? You can load the GPU zap shader in EL2 without further > changes in the drm/msm driver?
Lemans GPU DT patches are still in the mailing lists. Hopefully, they will be picked up for v6.19. -Akhil. > > What about &remoteproc_gpdsp0 and &remoteproc_gpdsp1? > > Please make the changes in a way that they result in a properly > functional boot without errors. Disable functionality that needs > more work before it can be enabled in EL2. > > Thanks, > Stephan >
