linux-kernel - Re: [PATCH v2 05/13] platform/x86: hfi: Introduce AMD Hardware Feedback Interface Driver

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Message-ID: <20241017233343.GA308@ranerica-svr.sc.intel.com>
Date: Thu, 17 Oct 2024 16:33:43 -0700
From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	x86@...nel.org, "Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-pm@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Shyam Sundar S K <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH v2 05/13] platform/x86: hfi: Introduce AMD Hardware
 Feedback Interface Driver

On Tue, Oct 15, 2024 at 01:09:42PM -0500, Mario Limonciello wrote:
> > 
> > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
> > 
> > I tried to find the HFI details on the documents in this "bug" but I could
> > not find them. What document in specific could I look at?
> > 
> > Thanks and BR,
> > Ricardo
> 
> Hi Ricardo,
> 
> It is spread out across multiple places.  This is part of the reason for
> patch 1 in the series outlines details of how it works.
> 
> The reason for that "collect all" Bugzilla for documentation is because the
> URLs for AMD documentation have undergone changes in the past and it makes
> it difficult to put stable URLs in commit messages.  So teams that want to
> reference documentation put it on a dump all bug for a stable URL to
> reference.
> 
> On that link you will find the APM, which will have some documentation
> specifically for the CPUID leafs used for topology identification and
> clearing history.
> 
> Read patch 1 and let me know if it covers what specifically you're looking
> for.  If it's still missing some info let me know what you would like added.

Thank you for your reply! I read patch 1. I was wondering specifically about
more details of the Class ID. I see that they have associated counters and
desired scheduling behavior.

I was also curious about the layout of the HFI table. I guess I can infer it
from patches 5 and 6 but if there is a picture already, I wouldn't mind. ;)