Messages in this thread | | | Date | Tue, 23 Feb 2010 10:06:26 -0800 | From | Jesse Barnes <> | Subject | Re: [PATCH v5 0/5] PCI: try "pci=use_crs" again |
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On Tue, 23 Feb 2010 10:24:15 -0700 Bjorn Helgaas <bjorn.helgaas@hp.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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