From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762629AbXLTM2o (ORCPT ); Thu, 20 Dec 2007 07:28:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760148AbXLTM2b (ORCPT ); Thu, 20 Dec 2007 07:28:31 -0500 Received: from mx1.redhat.com ([66.187.233.31]:39956 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759209AbXLTM23 (ORCPT ); Thu, 20 Dec 2007 07:28:29 -0500 Message-ID: <476A5FE9.80008@redhat.com> Date: Thu, 20 Dec 2007 07:28:25 -0500 From: Tony Camuso Reply-To: tcamuso@redhat.com User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: gregkh@suse.de, linux-kernel@vger.kernel.org, linux-pci@atrey.karlin.mff.cuni.cz Subject: [Fwd: Re: [PATCH 0/5]PCI: x86 MMCONFIG] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org -------- Original Message -------- Subject: Re: [PATCH 0/5]PCI: x86 MMCONFIG Date: Wed, 19 Dec 2007 19:44:13 -0500 From: Tony Camuso Reply-To: tcamuso@redhat.com To: Robert Hancock References: <4769B368.1030402@shaw.ca> Robert Hancock wrote: > Greg KH wrote: > > I think we need more details on why this patch is needed. Also, we > already have something like this in arch/x86/pci/mmconfig-shared.c, in > the unreachable_devices function. This attempts to detect devices where > MMCONFIG cannot access the configuration space (one of these would be at > least one device in the AMD K8 built-in northbridge). If this is not > sufficient, I would suggest expanding that mechanism instead of adding > all this new code. > We thought of doing that. But IIRC, unreachable_devices() only covers the first 16 buses on segment 0. What happens to the bitmap when you want to cover all possible buses on all possible segments? We felt that we had to come up with a more in-line way of doing this.