From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756567AbZHFTgb (ORCPT ); Thu, 6 Aug 2009 15:36:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756541AbZHFTga (ORCPT ); Thu, 6 Aug 2009 15:36:30 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:46543 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756197AbZHFTga (ORCPT ); Thu, 6 Aug 2009 15:36:30 -0400 Subject: Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU From: David Woodhouse To: Jeremy Fitzhardinge Cc: Dave Airlie , xen-devel@lists.xensource.com, Zhenyu Wang , Joerg Roedel , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Keir Fraser In-Reply-To: <4A7B2FC6.9070104@goop.org> References: <1248707041.6100.35.camel@macbook.infradead.org> <21d7e9970907282328l4a44b9a2of4500c5c84a3586b@mail.gmail.com> <1248851712.19733.214.camel@macbook.infradead.org> <21d7e9970907290143q6778511cvda1c6b915f61654a@mail.gmail.com> <1248860205.19733.238.camel@macbook.infradead.org> <4A78C9C6.6010103@goop.org> <1249454696.9324.325.camel@macbook.infradead.org> <21d7e9970908042357m6080e88fyeaaad171888766f2@mail.gmail.com> <4A79CEEC.9030008@goop.org> <21d7e9970908051612v140c2ebfu591e8fe817237889@mail.gmail.com> <4A7B2FC6.9070104@goop.org> Content-Type: text/plain Date: Thu, 06 Aug 2009 20:36:21 +0100 Message-Id: <1249587381.568.58.camel@macbook.infradead.org> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 (2.26.3-1.fc11) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2009-08-06 at 12:32 -0700, Jeremy Fitzhardinge wrote: > On 08/05/09 16:12, Dave Airlie wrote: > > My main problem with doing this is getting testing coverage on older > > systems, if we change all the AGP drivers, the time to find we busted > > something is probably not until the next major distro release with this code > > in it. So people can run stuff on 5 year old hardware in 6 months? I'm > > not sure the gains justify the costs, but if you guys really want to do it > > I'll take the patch, just be prepared to have it ripped out the minute > > we get a regression we can't figure out because we haven't got the hw anymore. > > > > Can you point to some changesets/patches to act as an example/template > for the changes needed? http://git.infradead.org/users/dwmw2/iommu-agp.git/shortlog/ba3139f2577eee24479db73b8dfc7d78eaf4c486 Some of the code added to intel-agp should probably be generic. -- David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation