linux-kernel - Re: [RFT][PATCH] PCI / ACPI: Do not require MSI support for PCIe native features

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Message-Id: <201103172222.33336.rjw@sisk.pl>
Date:	Thu, 17 Mar 2011 22:22:33 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [RFT][PATCH] PCI / ACPI: Do not require MSI support for PCIe native features

On Thursday, March 17, 2011, Yinghai Lu wrote:
> 2011/3/16 Rafael J. Wysocki <rjw@...k.pl>:
> > On Tuesday, March 15, 2011, Sarah Sharp wrote:
> >> On Tue, Mar 15, 2011 at 01:00:17AM +0100, Rafael J. Wysocki wrote:
> >> > 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.

Thanks,
Rafael
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