On 02/03/2010 05:38 PM, 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. > > 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 2010 or newer and for > a few machines that we know need it. > > These apply on 0148b041be4e7, which is the current head of the linux-next > branch of Jesse's pci-2.6 git tree. The first patch is just Jeff Garrett's > patch to remove intel_bus.c, so that is only here for people who want to test > the rest of the patches. I expect Jesse will pick up Jeff's patch via Linus' > tree. > > Gary and Peter have some of these problem machines, so I'm hoping they can give > this a whirl. > > Larry, you reported the problem the last time I tried to turn on "pci=use_crs" > by default. This series shouldn't affect your machine because it's not in the > whitelist, but I expect that if you boot the current kernel with "pci=use_crs", > it should still fail, and if you boot with these patches and "pci=use_crs", it > *should* work. I know it's a lot to ask, but it'd be great if you had a chance > to try that. On my system, "git describe" returns v2.6.33-rc6-146-gc80d292. Patch 1 does not apply and can be reverted. That is not a problem, but beginning with patch 5, these do not apply. In addition to the above, my system now boots with "pci=use_crs", unlike when I filed the Bugzilla. What kernel should I be running to test these patches? Larry -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
