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Message-ID: <21d7e9970810291440w50d15c30o961dad801cf71548@mail.gmail.com>
Date: Thu, 30 Oct 2008 07:40:33 +1000
From: "Dave Airlie" <airlied@gmail.com>
To: "Dave Jones" <davej@redhat.com>, "Dave Airlie" <airlied@gmail.com>,
       bob.montgomery@hp.com, "Yinghai Lu" <yinghai@kernel.org>,
       "Ingo Molnar" <mingo@elte.hu>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "vojtech@suse.cz" <vojtech@suse.cz>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       "chandru@in.ibm.com" <chandru@in.ibm.com>,
       "Joerg Roedel" <joerg.roedel@amd.com>,
       "FUJITA Tomonori" <fujita.tomonori@lab.ntt.co.jp>,
       "Jesse Barnes" <jbarnes@virtuousgeek.org>,
       "Pavel Machek" <pavel@ucw.cz>, "Andi Kleen" <ak@linux.intel.com>
Subject: Re: [PATCH] disable CPU side GART accesses
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On Thu, Oct 30, 2008 at 7:32 AM, Dave Jones <davej@redhat.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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