linux-kernel - [PATCH] Remove Barcelona Thermal Throttling

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Message-ID: <3f1a065b0802032213j713fe551t9a0642ea2b83994@mail.gmail.com>
Date:	Sun, 3 Feb 2008 22:13:53 -0800
From:	"Russell Leidich" <rml@...gle.com>
To:	"Andi Kleen" <andi@...stfloor.org>,
	"Torsten Kaiser" <just.for.lkml@...glemail.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, valdis.kletnieks@...edu
Subject: [PATCH] Remove Barcelona Thermal Throttling

All,

You can imagine my dismay when I recently learned that, after all our
collective effort, hardware thermal throttling does not work reliably
on Barcelona, according to AMD.  Due to NDA restrictions, I am unable
to provide further details.

But the effort has not been a waste; whenever AMD manages to make a
reliable hardware thermal sensor, this code should "just work" along
with all the other northbridge initialization associated with the
device IDs in k8_northbridges[].

This patch Blacklists Barcelona as non-hardware-thermal-throttlable
(in addition to RevF, which was already blacklisted).  On the
recommendation of my colleagues, it also contains these politeness
enhancements: (1) warns the user if the CPU is _not_ blacklisted, but
the BIOS neglected to enable thermal throttling (as a safety measure)
and (2) uses the PCI_SLOT macro instead of the more obnoxious
shift-right-by-3 to compute PCI device numbers.

This patch assumes that it is being applied _after_ my previous patch
has already been integrated.  I mailed out that patch on 1/17/2008
with subject "Re: [PATCH] AMD Thermal Interrupt Support".
-- 
Russell Leidich

View attachment "patch.txt" of type "text/plain" (2369 bytes)