linux-kernel - Re: [PATCH] EDAC/mce_amd: Remove SMCA Extended Error code descriptions

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Date:   Wed, 7 Jun 2023 10:07:49 -0400
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     Muralidhara M K <muralimk@....com>, linux-edac@...r.kernel.org,
        x86@...nel.org
Cc:     yazen.ghannam@....com, linux-kernel@...r.kernel.org, bp@...en8.de,
        mingo@...hat.com, mchehab@...nel.org, tony.luck@...el.com,
        nchatrad@....com, Muralidhara M K <muralidhara.mk@....com>
Subject: Re: [PATCH] EDAC/mce_amd: Remove SMCA Extended Error code
 descriptions

On 5/23/23 4:55 AM, Muralidhara M K wrote:
> From: Muralidhara M K <muralidhara.mk@....com>
> 
> On AMD systems with Scalable MCA, each machine check error of a SMCA bank
> type has an associated bit position in the bank's control (CTL) register.
> 
> An error's bit position in the CTL register is used during error decoding
> for offsetting into the corresponding bank's error description structure.
> As new errors are being added in newer AMD systems for existing SMCA bank
> types, the underlying SMCA architecture guarantees that the bit positions
> of existing errors are not altered.
> 
> However, on some AMD systems some of the existing bit definitions in the
> CTL register of SMCA bank type are reassigned without defining new HWID
> and McaType. Consequently, the errors whose bit definitions have been
> reassigned in the CTL register are being erroneously decoded.
> 
> Remove SMCA Extended Error Code descriptions. This avoids decoding issues
> for incorrectly reassigned bits, and avoids the related maintenance burden
> in the kernel. This decoding can be done in external tools or by referring
> to AMD documentation. The bank type and Extended Error Code value for an
> error will continue to be printed as a convenience
>

Minor nit: there should be a (.) at the end of the last sentence.

> Signed-off-by: Muralidhara M K <muralidhara.mk@....com>
> ---
>  drivers/edac/mce_amd.c | 480 -----------------------------------------
>  1 file changed, 480 deletions(-)
> 

This patch is completely within EDAC, so it's not necessary to copy the
x86 or TIP maintainers.

Also, this patch was sent in-reply-to another patch that is not related.
Each of these can be sent independently.

Otherwise, this looks good to me.

Reviewed-by: Yazen Ghannam <yazen.ghannam@....com>

Thanks,
Yazen