linux-kernel - Re: [PATCH v5 0/5] PCI: try "pci=use

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Message-ID: <20100223100626.693b50b6@jbarnes-piketon>
Date:	Tue, 23 Feb 2010 10:06:26 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, Peter Haight <peterh@...ros.com>,
	Gary Hade <garyhade@...ibm.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, linux-am33-list@...hat.com,
	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH v5 0/5] PCI: try "pci=use_crs" again

On Tue, 23 Feb 2010 10:24:15 -0700
Bjorn Helgaas <bjorn.helgaas@...com> 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
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