linux-kernel - Re: [PATCH v2 3/7] firmware: dmi: Read additional information when decoding DMI table

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Message-ID: <7d19e83a-9017-4058-8993-53fa1a9bd64f@kernel.org>
Date: Wed, 17 Dec 2025 15:23:10 -0600
From: Mario Limonciello <superm1@...nel.org>
To: Yazen Ghannam <yazen.ghannam@....com>
Cc: "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
 Jean Delvare <jdelvare@...e.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "H . Peter Anvin"
 <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] firmware: dmi: Read additional information when
 decoding DMI table

On 12/17/25 3:21 PM, Yazen Ghannam wrote:
> On Wed, Dec 17, 2025 at 03:09:33PM -0600, Mario Limonciello wrote:
>> On 12/17/25 3:03 PM, Yazen Ghannam wrote:
>>> On Tue, Dec 16, 2025 at 06:33:50AM -0600, Mario Limonciello (AMD) wrote:
>>>> Type 40 entries (Additional information) are summarized in section
>>>> 7.41 as part of the SMBIOS specification.  Save these entries when
>>>> decoding the DMI tables.
>>>>
>>>
>>> Why can't an interested user just use dmidecode?
>>>
>>> Thanks,
>>> Yazen
>>
>> They could.  The reason for doing it in this series is the same reason for
>> the one that we did the S5 bit.
>>
>> It shows up in the logs, you can tie regressions to the AGESA version at
>> specifically at the time of the failure if they've done BIOS updates since
>> then.
> 
> Yes, right. Sorry, I mixed this up with the debugfs patch.
> 
> We need to save it here so the init code can find it.
> 
> But why do we need a debugfs entry for it?

Ah.  That one I don't feel strongly about.

I used it when I was getting the series working and it felt like a waste 
to toss.