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

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Date:	Thu, 30 Oct 2008 07:40:33 +1000
From:	"Dave Airlie" <airlied@...il.com>
To:	"Dave Jones" <davej@...hat.com>, "Dave Airlie" <airlied@...il.com>,
	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 7:32 AM, Dave Jones <davej@...hat.com> wrote:
> 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.
>

I was more going the other way, why use the IOMMU for AGP when it has
other tasks to
do, and we have a host chipset GART.

Granted I've never had an AMD + AGP system to ever care about this.

Dave.
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