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Bug#981186: linux: Enable CMN-600 interconnect on arm64

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From Vincent Blut <vincent.debian@free.fr>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#981186: linux: Enable CMN-600 interconnect on arm64
Date Wed, 17 Mar 2021 15:00:02 +0100
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Hi Wookey,

Le 2021-01-27 12:57, Wookey a écrit :
> Source: linux
> Version: Please enable ARM CMN-600 power management on arm64
> Severity: normal
> Tags: patch
> 
> Current arm hardware such as graviton2 (AWS arm64 hardware) has
> 'Coherent Mesh Network' interconnect (between components in a
> soc). It's important that support for this is built in the kernel so
> it can be used.
> 
> This requires CONFIG_ARM_CMN=y

Does it really have to be built-in instead of being provided as a module? Last I
checked, Fedora and Ubuntu provide it as a module.

> This explains what the feature is:
> https://www.arm.com/products/silicon-ip-system/corelink-interconnect/cmn-600
> Graviton2:
> https://www.anandtech.com/show/15578/cloud-clash-amazon-graviton2-arm-against-intel-and-amd
> 
> patch attached:
> --- debian/config/arm64/config~	2021-01-27 04:34:51.359552398 +0000
> +++ debian/config/arm64/config	2021-01-27 04:53:11.922998842 +0000
> @@ -942,6 +942,7 @@
>  CONFIG_ARM_CCI400_PMU=y
>  CONFIG_ARM_CCI5xx_PMU=y
>  CONFIG_ARM_CCN=y
> +CONFIG_ARM_CMN=y
>  CONFIG_QCOM_L2_PMU=y
>  CONFIG_QCOM_L3_PMU=y
>  CONFIG_XGENE_PMU=y

> --- debian/config/arm64/config~	2021-01-27 04:34:51.359552398 +0000
> +++ debian/config/arm64/config	2021-01-27 04:53:11.922998842 +0000
> @@ -942,6 +942,7 @@
>  CONFIG_ARM_CCI400_PMU=y
>  CONFIG_ARM_CCI5xx_PMU=y
>  CONFIG_ARM_CCN=y
> +CONFIG_ARM_CMN=y
>  CONFIG_QCOM_L2_PMU=y
>  CONFIG_QCOM_L3_PMU=y
>  CONFIG_XGENE_PMU=y

Cheers,
Vincent

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Thread

Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@debian.org> - 2021-01-27 14:10 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Noah Meyerhans <noahm@debian.org> - 2021-02-02 22:40 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 03:30 +0100
  Processed: Re: Bug#981186: linux: Enable CMN-600 interconnect on  arm64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-17 15:00 +0100
  Processed: Re: Bug#981186: linux: Enable CMN-600 interconnect on  arm64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-17 15:00 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 15:00 +0100
    Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 17:00 +0100
      Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 19:50 +0100
        Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 20:30 +0100
          Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 22:10 +0100
            Bug#981186: linux: Enable CMN-600 interconnect on arm64 Salvatore Bonaccorso <carnil@debian.org> - 2021-03-19 10:00 +0100

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