From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Date: Thu, 04 Feb 2010 18:29:39 +0000 Subject: Re: [PATCH v2 0/3] pci_root: track downstream bus range for _CBA Message-Id: <201002041129.40116.bjorn.helgaas@hp.com> List-Id: References: <20091110170802.10645.91272.stgit@bob.kio> In-Reply-To: <20091110170802.10645.91272.stgit@bob.kio> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Len Brown Cc: linux-acpi@vger.kernel.org, linux-ia64@vger.kernel.org, linux-pci@vger.kernel.org On Tuesday 10 November 2009 10:11:28 am Bjorn Helgaas wrote: > The PCI Firmware Spec requires BIOS to use _CBA, not MCFG, to report > MMCONFIG regions of hot-pluggable host bridges. Therefore, if the > hardware and firmware support host bridge hotplug, we will encounter > _CBA even if Linux itself doesn't support hotplug. > > These patches make the pci_root driver keep track of the downstream > bus range and make it available so arch-specific code can register > MMCONFIG regions if necessary. I think these patches got forgotten, but I still think they're worthwhile. I'd be glad to refresh them if necessary. Bjorn