From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Subject: Re: [PATCH v5 0/5] PCI: try "pci=use_crs" again Date: Tue, 23 Feb 2010 10:06:26 -0800 Message-ID: <20100223100626.693b50b6@jbarnes-piketon> References: <20100223172355.17242.55927.stgit@bob.kio> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from outbound-mail-313.bluehost.com ([67.222.54.6]:52200 "HELO outboundproxy6.bluehost.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1752332Ab0BWSGb (ORCPT ); Tue, 23 Feb 2010 13:06:31 -0500 In-Reply-To: <20100223172355.17242.55927.stgit@bob.kio> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Bjorn Helgaas Cc: Matthew Garrett , Tony Luck , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, Peter Haight , Gary Hade , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, linux-am33-list@redhat.com, Yinghai Lu , Ingo Molnar , Linus Torvalds , Larry Finger On Tue, 23 Feb 2010 10:24:15 -0700 Bjorn Helgaas wrote: > Historically, Linux has assumed a single PCI host bridge, with that > bridge claiming all the address space left after RAM and legacy > devices are taken out. > > If the system contains multiple host bridges, we can no longer > operate under that assumption. We have to know what parts of the > address space are claimed by each bridge so that when we assign > resources to a PCI device, we take them from a range claimed by the > upstream host bridge. > > On x86 and ia64, we use ACPI to enumerate all the PCI host bridges in > the system, and part of the host bridge description is the > "_CRS" (current resource settings" property, which lists the address > space used by the bridge. On x86, we currently ignore most of the > _CRS information. This patch series changes this, so we will use > _CRS to learn about the host bridge windows. > > Since most x86 machines with multiple host bridges are relatively > new, this series only turns this on for machines with BIOS dates of > 2008 or newer. > > Changes from v4 to v5: > - Add EXPORT_SYMBOL_GPL(pci_bus_resource_n) for module builds. Thanks, it built this time. Pushed to my linux-next branch. -- Jesse Barnes, Intel Open Source Technology Center