linux-kernel - Re: [PATCH v2 4/6] arm64: zynqmp: Add L2 cache nodes

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Date:   Tue, 23 May 2023 09:48:49 +0200
From:   Michal Simek <michal.simek@....com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
        Conor Dooley <conor+dt@...nel.org>,
        Harini Katakam <harini.katakam@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Piyush Mehta <piyush.mehta@...inx.com>,
        Rob Herring <robh+dt@...nel.org>,
        Robert Hancock <robert.hancock@...ian.com>,
        Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>,
        Tanmay Shah <tanmay.shah@....com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/6] arm64: zynqmp: Add L2 cache nodes



On 5/22/23 16:59, Michal Simek wrote:
> From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> 
> Describe SoC L2 cache hierarchy.
> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
> Changes in v2:
> - Update commit message to remove Linux part - reported by Laurent
> 
> Linux kernel throws "cacheinfo: Unable to detect cache hierarchy for
> CPU 0" warning when booting on zu+ Soc. To fix it add the L2 cache
> node and let each CPU point to it.
> 
> ---
>   arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> index a961bb6f31ff..02bd75900238 100644
> --- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> +++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> @@ -33,6 +33,7 @@ cpu0: cpu@0 {
>   			operating-points-v2 = <&cpu_opp_table>;
>   			reg = <0x0>;
>   			cpu-idle-states = <&CPU_SLEEP_0>;
> +			next-level-cache = <&L2>;
>   		};
>   
>   		cpu1: cpu@1 {
> @@ -42,6 +43,7 @@ cpu1: cpu@1 {
>   			reg = <0x1>;
>   			operating-points-v2 = <&cpu_opp_table>;
>   			cpu-idle-states = <&CPU_SLEEP_0>;
> +			next-level-cache = <&L2>;
>   		};
>   
>   		cpu2: cpu@2 {
> @@ -51,6 +53,7 @@ cpu2: cpu@2 {
>   			reg = <0x2>;
>   			operating-points-v2 = <&cpu_opp_table>;
>   			cpu-idle-states = <&CPU_SLEEP_0>;
> +			next-level-cache = <&L2>;
>   		};
>   
>   		cpu3: cpu@3 {
> @@ -60,6 +63,12 @@ cpu3: cpu@3 {
>   			reg = <0x3>;
>   			operating-points-v2 = <&cpu_opp_table>;
>   			cpu-idle-states = <&CPU_SLEEP_0>;
> +			next-level-cache = <&L2>;
> +		};
> +
> +		L2: l2-cache {
> +			compatible = "cache";
> +			cache-level = <2>;

Here should be also cache-unified;

Thanks,
Michal