linux-kernel - Re: [PATCH v2] perf/arm-cmn: Workaround AmpereOneX errata AC04_MESH

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Date: Fri,  9 Feb 2024 18:31:10 +0000
From: Will Deacon <will@...nel.org>
To: Robin Murphy <robin.murphy@....com>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	mark.rutland@....com,
	ilkka@...amperecomputing.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] perf/arm-cmn: Workaround AmpereOneX errata AC04_MESH_1 (incorrect child count)

On Fri, 9 Feb 2024 17:11:09 +0000, Robin Murphy wrote:
> From: Ilkka Koskinen <ilkka@...amperecomputing.com>
> 
> AmpereOneX mesh implementation has a bug in HN-P nodes that makes them
> report incorrect child count. The failing crosspoints report 8 children
> while they only have two.
> 
> When the driver tries to access the inexistent child nodes, it believes it
> has reached an invalid node type and probing fails. The workaround is to
> ignore those incorrect child nodes and continue normally.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] perf/arm-cmn: Workaround AmpereOneX errata AC04_MESH_1 (incorrect child count)
      https://git.kernel.org/arm64/c/50572064ec71

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev