linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: Introduce a carveout for modem metadata

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Message-ID: <7ea03855-4806-f4ca-e0c3-4044e1095d6b@linaro.org>
Date:   Tue, 13 Dec 2022 20:40:06 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sibi Sankar <quic_sibis@...cinc.com>, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        manivannan.sadhasivam@...aro.org
Cc:     agross@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, amit.pundir@...aro.org,
        regressions@...mhuis.info, sumit.semwal@...aro.org,
        will@...nel.org, catalin.marinas@....com, robin.murphy@....com
Subject: Re: [PATCH 1/4] arm64: dts: qcom: Introduce a carveout for modem
 metadata

On 13/12/2022 15:07, Sibi Sankar wrote:
> Introduce a new carveout for modem metadata. This will serve as a
> replacement for the memory region used by MSA to authenticate modem
> ELF headers.
> 
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>

Thank you for your patch. There is something to discuss/improve.

>  
>  	aliases {
> @@ -865,7 +870,7 @@ hp_i2c: &i2c9 {
>  	clock-names = "iface", "bus", "nav", "snoc_axi", "mnoc_axi", "xo";
>  
>  	iommus = <&apps_smmu 0x461 0x0>, <&apps_smmu 0x444 0x3>;
> -	memory-region = <&mba_mem &mpss_mem>;
> +	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
>  
>  	/* This gets overridden for SKUs with LTE support. */
>  	firmware-name = "qcom/sc7180-trogdor/modem-nolte/mba.mbn",
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
> index bf522a64b172..bda0495aa0b5 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
> @@ -17,6 +17,11 @@
>  			reg = <0x0 0x9c700000 0x0 0x200000>;
>  			no-map;
>  		};
> +
> +		mdata_mem: memory@...00000 {
> +			reg = <0x0 0x9d100000 0x0 0x4000>;
> +			no-map;
> +		};
>  	};
>  };
>  
> @@ -32,7 +37,7 @@
>  
>  	iommus = <&apps_smmu 0x124 0x0>, <&apps_smmu 0x488 0x7>;
>  	interconnects = <&mc_virt MASTER_LLCC 0 &mc_virt SLAVE_EBI1 0>;
> -	memory-region = <&mba_mem>, <&mpss_mem>;
> +	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;

Only two memory regions are allowed by bindings... unless you fix it in
further patchset. If so, please re-order to have the bindings first. It
helps reviewers not to have such questions. :)


Best regards,
Krzysztof