linux-kernel - Re: PCI device problem - MMCONFIG, cannot allocate resource region, resource collisions

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Date:	Wed, 23 May 2007 20:10:54 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Wayne Sherman <wsherman@...il.com>
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	linux-kernel@...r.kernel.org
Subject: Re: PCI device problem - MMCONFIG, cannot allocate resource region, resource collisions

On Wednesday, May 23, 2007 8:08:23 Jesse Barnes wrote:
> On Wednesday, May 23, 2007 5:20:46 Wayne Sherman wrote:
> > Ivan Kokshaysky wrote:
> > > No, it won't help. The 1M range (ff500000-ff5fffff) is more than
> > > enough.
> >
> > Good catch, I didn't look close enough at the allocations of the devices
> > under the bridge.
> >
> > > The reason why the D-Link resource is not getting assigned is rather
> > > interesting: as Wayne wrote
> > >
> > >> Here is the D-LINK NIC:
> > >> # od -t x4 /sys/devices/pci0000:00/0000:00:14.4/0000:02:02.0/config
> > >>
> > >> 0000000 49011186 80b00117 00000011 00004010
> > >
> > > 			    ^^^^^^
> > > which means that the device class is 0 (not defined).
> > > And in drivers/pci/setup-bus.c we have
> > >
> > > 		/* Don't touch classless devices or host bridges or ioapics.  */
> > > 		if (class == PCI_CLASS_NOT_DEFINED ||
> > > 		    class == PCI_CLASS_BRIDGE_HOST)
> > > 			continue;
> > >
> > > The short term fix would be to assign proper device class to D-Link NIC
> > > using pci quirk...
> >
> > I would like to try this, where do I find "pci quirk"?
>
> You'll need a patch roughly like this.  I'm not sure if it should be a
> header fixup or early fixup though...
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 65d6f23..801712f 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -1690,6 +1690,14 @@ static void __devinit quirk_p64h2_1k_io(struct
> pci_dev *dev)
>  }
>  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	0x1460,		quirk_p64h2_1k_io);
>
> +/* Give unknown D-Link network adapters a proper class */
> +static void __devinit quirk_dlink_unknown(struct pci_dev *dev)
> +{
> +	if (dev->class = PCI_CLASS_UNKNOWN)

Err, == of course.  Obviously I didn't test this. :)

Jesse
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