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From: Yazen Ghannam <yazen.ghannam@amd.com>
To: Phineas Su <pohaosu@google.com>
Cc: bp@alien8.de, tony.luck@intel.com, muralidhara.mk@amd.com,
	linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] EDAC/amd64: Fix incorrect Node ID mapping on CPU-only Zen4+ systems
Date: Tue, 9 Jun 2026 12:07:32 -0400	[thread overview]
Message-ID: <20260609160732.GA19967@yaz-khff2.amd.com> (raw)
In-Reply-To: <20260608072607.1819873-1-pohaosu@google.com>

On Mon, Jun 08, 2026 at 07:26:07AM +0000, Phineas Su wrote:
> On CPU-only systems using AMD Zen4 (Genoa) and newer processors, memory
> ECC errors can be reported with an incorrect Node ID (incremented by 1).
> This happens because these CPUs use SMCA_UMC_V2 banks, which triggers
> the GPU node ID fixup logic in fixup_node_id().
> 

Can you please share the MCA_IPID register value for these banks?

The statement 'Zen4 and newer processors...use SMCA_UMC_V2 banks' isn't
generally true.

This system may be a special case. Or there may be a hardware issue. Or
there may be a bug in the kernel enumeration code.

Thanks,
Yazen

  reply	other threads:[~2026-06-09 16:07 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-08  7:26 [PATCH] EDAC/amd64: Fix incorrect Node ID mapping on CPU-only Zen4+ systems Phineas Su
2026-06-09 16:07 ` Yazen Ghannam [this message]
2026-06-14 14:15   ` Phineas Su
2026-06-14 15:06     ` [PATCH v2] EDAC/amd64: Only translate Node ID if GPU nodes are present Phineas Su
2026-06-22 17:07       ` Yazen Ghannam
2026-06-23  0:49         ` Borislav Petkov
2026-06-23 15:49           ` Yazen Ghannam

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