linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Define CMA region for CRD and X13s

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Date:   Wed, 18 Jan 2023 14:24:18 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Halaney <ahalaney@...hat.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Define CMA region for CRD
 and X13s



On 17.01.2023 19:46, Bjorn Andersson wrote:
> While booting the CRD, a series of CMA allocation errors can be seen in
> the kernel log:
> 
>   cma: cma_alloc: reserved: alloc failed, req-size: 128 pages, ret: -12
> 
> Growing the CMA region and querying /proc/meminfo indicates that a newly
> booted system (currently) uses 64MB CMA.
> 
> Define a memory region sufficiently large for the current use cases, to
> avoid forcing users to add this themselves, through command line
> parameters etc.
> 
> While fixing the CRD define the same region for the X13s.
> 
> Tested-by: Andrew Halaney <ahalaney@...hat.com> # sc8280xp-lenovo-thinkpad-x13s
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
> 
> Changes since v1:
> - Updated commit message
> 
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts                | 9 +++++++++
>  .../boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts      | 9 +++++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> index 4e92dc28e2ce..6f686377dc3e 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> @@ -128,6 +128,15 @@ vreg_wwan: regulator-wwan {
>  
>  		regulator-boot-on;
>  	};
> +
> +	reserved-memory {
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x8000000>;
> +			reusable;
> +			linux,cma-default;
> +		};
> +	};
>  };
>  
>  &apps_rsc {
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index 55ecbee19a58..8d485e0000cf 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -153,6 +153,15 @@ vreg_wwan: regulator-wwan {
>  		regulator-boot-on;
>  	};
>  
> +	reserved-memory {
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x8000000>;
> +			reusable;
> +			linux,cma-default;
> +		};
> +	};
> +
>  	thermal-zones {
>  		skin-temp-thermal {
>  			polling-delay-passive = <250>;