From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759141Ab0EMUJr (ORCPT ); Thu, 13 May 2010 16:09:47 -0400 Received: from terminus.zytor.com ([198.137.202.10]:33198 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757028Ab0EMUJn (ORCPT ); Thu, 13 May 2010 16:09:43 -0400 Message-ID: <4BEC5C6A.7040205@zytor.com> Date: Thu, 13 May 2010 13:09:14 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: Bjorn Helgaas CC: Mike Habeck , Mike Travis , Ingo Molnar , Thomas Gleixner , x86@kernel.org, Jesse Barnes , Jacob Pan , Tejun Heo , LKML , Yinghai , "linux-pci@vger.kernel.org" , Myron Stowe Subject: Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already assigned References: <4BEAF008.9030805@sgi.com> <201005131256.17997.bjorn.helgaas@hp.com> <4BEC5530.1000008@sgi.com> <201005131402.30759.bjorn.helgaas@hp.com> In-Reply-To: <201005131402.30759.bjorn.helgaas@hp.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/13/2010 01:02 PM, Bjorn Helgaas wrote: > > Yep, that's definitely a problem, and I don't have a good solution. > > HP (and probably SGI) had a nice hardware solution for ia64 -- > address translation across the host bridge, so each bridge could > have its own 64K I/O space. But I don't see that coming in the > x86 PC arena. > I would agree, that is unlikely (not that I have any information on this subject, mind you.) Much more likely would be a bridge extension capability for finer-grained I/O space routing. -hpa