Groups > linux.debian.bugs.dist > #1045971

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

From	Noah Meyerhans <noahm@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#981186: linux: Enable CMN-600 interconnect on arm64
Date	2021-02-02 22:40 +0100
Message-ID	<BEbyW-oy-3@gated-at.bofh.it> (permalink)
References	<BBSK6-4YS-7@gated-at.bofh.it> <BBSK6-4YS-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Wed, Jan 27, 2021 at 12:57:07PM +0000, Wookey wrote:
> 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

To be precise, this driver is needed for perf event monitoring of this
interconnect.  The interconnect itself is always in use.

On Amazon EC2, these PMU events are only exposed on the bare-metal
instances (e.g. m6g.metal), not the VMs.

We should still enable support for this driver, in any case.

noah

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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

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