On Thu, Mar 17, 2011 at 10:22:33PM +0100, Rafael J. Wysocki wrote:

On Thursday, March 17, 2011, Yinghai Lu wrote:

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2011/3/16 Rafael J. Wysocki [off-list ref]:

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On Tuesday, March 15, 2011, Sarah Sharp wrote:

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On Tue, Mar 15, 2011 at 01:00:17AM +0100, Rafael J. Wysocki wrote:

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Well, I must admit I have no idea what the problem is.  OK, in addition to the
above changes, please replace the "pci_ext_cfg_avail(root->bus->self)" in the
same file with "true" and see if _that_ helps.

Yay, that worked!  dmesg is attached.

Good, at least we know what the problem is, now we only have to find the root
cause. ;-)

So, pci_ext_cfg_avail(root->bus->self) returns 0 on your machine, which is kind
of unexpected (to put it lightly), so very likely we have uncovered a bug
in the init code.

Unfortunately, I may not be able to take care of this issue for the next few
days, I'll let you know when I get back to it.

her .config does not define PCI_MMCONFIG

#
# Bus options (PCI etc.)
#
CONFIG_PCI=y
CONFIG_PCI_DIRECT=y
# CONFIG_PCI_MMCONFIG is not set

Ah, good catch, thanks!

@Sarah: you need to set that for PCI Express to work in general.

Oh, man, sorry to cause so much work to figure that out. :)  I'll
compile with that set and see if it helps.  Not sure why that config
worked on 2.6.37, but not 2.6.38.  I usually just run `make -j4` with
the old .config and basically pick the defaults, except for turning on
the occasional new USB device driver.

Sarah Sharp