Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754840AbYKGERv (ORCPT ); Thu, 6 Nov 2008 23:17:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751001AbYKGERk (ORCPT ); Thu, 6 Nov 2008 23:17:40 -0500 Received: from palinux.external.hp.com ([192.25.206.14]:43080 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750806AbYKGERj (ORCPT ); Thu, 6 Nov 2008 23:17:39 -0500 Date: Thu, 6 Nov 2008 21:17:22 -0700 From: Matthew Wilcox To: "Zhao, Yu" Cc: Greg KH , "linux-pci@vger.kernel.org" , "achiang@hp.com" , "grundler@parisc-linux.org" , "mingo@elte.hu" , "jbarnes@virtuousgeek.org" , "randy.dunlap@oracle.com" , "rdreier@cisco.com" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "virtualization@lists.linux-foundation.org" Subject: Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters Message-ID: <20081107041721.GB15439@parisc-linux.org> References: <20081022083809.GA3757@yzhao12-linux.sh.intel.com> <20081022084531.GP3773@yzhao12-linux.sh.intel.com> <20081106043235.GA30292@kroah.com> <4913AA03.5060807@intel.com> <20081107025032.GA12824@kroah.com> <4913B8A5.5010806@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4913B8A5.5010806@intel.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1693 Lines: 36 On Fri, Nov 07, 2008 at 11:40:21AM +0800, Zhao, Yu wrote: > Greg KH wrote: > >We've thought about this in the past, and even Microsoft said it was > >going to happen for Vista, but they realized in the end, like we did a > >few years previously, that it would require full support of all PCI > >drivers as well (if you rebalance stuff that is already bound to a > >driver.) So they dropped it. > > > >When would you want to do this kind of rebalancing? Before any PCI > >driver is bound to any devices? Or afterwards? > > I guess if we want the rebalance dynamic, then we should have it full -- > the rebalance would be functional even after the driver is loaded. > > But in most cases, there will be problem when we unload driver from a > hard disk controller, etc. We can mount root on a ramdisk and do the > rebalance there, but it's complicated for a real user. > > So looks like doing rebalancing before any driver is bound to any device > is also a nice idea, if user can get a shell to do rebalance before > built-in PCI driver grabs device. Can we use the suspend/resume code to do this? Some drivers (sym2 for one) would definitely need to rerun some of their init code to cope with a BAR address changing. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/