linux-kernel - Re: [PATCH v3 7/7] arm64: dts: qcom: sa8775p: add the GPU IOMMU node

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Date:   Tue, 11 Apr 2023 15:16:15 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 7/7] arm64: dts: qcom: sa8775p: add the GPU IOMMU node



On 11.04.2023 14:59, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Add the Adreno GPU IOMMU for sa8775p-based platforms.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sa8775p.dtsi | 37 +++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> index 191b510b5a1a..11f3d80dd869 100644
> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> @@ -7,6 +7,7 @@
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/clock/qcom,rpmh.h>
>  #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
> +#include <dt-bindings/clock/qcom,sa8775p-gpucc.h>
>  #include <dt-bindings/interconnect/qcom,sa8775p-rpmh.h>
>  #include <dt-bindings/power/qcom-rpmpd.h>
>  #include <dt-bindings/soc/qcom,rpmh-rsc.h>
> @@ -605,6 +606,42 @@ gpucc: clock-controller@...0000 {
>  			#power-domain-cells = <1>;
>  		};
>  
> +		adreno_smmu: iommu@...0000 {
> +			compatible = "qcom,sa8775p-smmu-500", "qcom,adreno-smmu",
> +				     "arm,mmu-500";
Err.. does it even boot like this? You dropped the qcom,smmu-500 compatible
which means it's getting bound to the generic SMMU driver (without
QC quirks). If that was a mistake, you should have had all 4

"qcom,sa8775p-smmu-500", qcom,adreno-smmu, "qcom,smmu-500", "arm,mmu-500"

Without falling into the qc-specific codepaths, the Adreno compat does
nothing.

Konrad
> +			reg = <0x0 0x03da0000 0x0 0x20000>;
> +			#iommu-cells = <2>;
> +			#global-interrupts = <2>;
> +			dma-coherent;
> +			power-domains = <&gpucc GPU_CC_CX_GDSC>;
> +			clocks = <&gcc GCC_GPU_MEMNOC_GFX_CLK>,
> +				 <&gcc GCC_GPU_SNOC_DVM_GFX_CLK>,
> +				 <&gpucc GPU_CC_AHB_CLK>,
> +				 <&gpucc GPU_CC_HLOS1_VOTE_GPU_SMMU_CLK>,
> +				 <&gpucc GPU_CC_CX_GMU_CLK>,
> +				 <&gpucc GPU_CC_HUB_CX_INT_CLK>,
> +				 <&gpucc GPU_CC_HUB_AON_CLK>;
> +			clock-names = "gcc_gpu_memnoc_gfx_clk",
> +				      "gcc_gpu_snoc_dvm_gfx_clk",
> +				      "gpu_cc_ahb_clk",
> +				      "gpu_cc_hlos1_vote_gpu_smmu_clk",
> +				      "gpu_cc_cx_gmu_clk",
> +				      "gpu_cc_hub_cx_int_clk",
> +				      "gpu_cc_hub_aon_clk";
> +			interrupts = <GIC_SPI 673 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 674 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 678 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 679 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 680 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 681 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 682 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 683 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 684 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 685 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 686 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 687 IRQ_TYPE_LEVEL_HIGH>;
> +		};
> +
>  		pdc: interrupt-controller@...0000 {
>  			compatible = "qcom,sa8775p-pdc", "qcom,pdc";
>  			reg = <0x0 0x0b220000 0x0 0x30000>,