linux-kernel - Re: [PATCH] disable CPU side GART accesses

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Message-ID: <20081029213244.GD24794@redhat.com>
Date:	Wed, 29 Oct 2008 17:32:44 -0400
From:	Dave Jones <davej@...hat.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	bob.montgomery@...com, Yinghai Lu <yinghai@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vojtech@...e.cz" <vojtech@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"chandru@...ibm.com" <chandru@...ibm.com>,
	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Pavel Machek <pavel@....cz>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] disable CPU side GART accesses

On Thu, Oct 30, 2008 at 07:24:34AM +1000, Dave Airlie wrote:

 > This stops the CPU from using the aperture for most DRI things. I
 > can't confirm this won't regress working systems
 > though. The whole AMD GART thing scares me, esp if some of the host
 > chipsets also have an AGP GART.

The easy cop-out for those in the past has been 'dont support them'.
It's why we removed some K8 chipset PCI IDs from the via driver for eg.
iirc, if we leave them unprogrammed, they're essentially irrelevant.

	Dave

-- 
http://www.codemonkey.org.uk
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