linux-kernel - Re: [Regression] PCI resources allocation problem on HP nx6325

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Date:	Sun, 2 Aug 2009 10:59:26 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression] PCI resources allocation problem on HP nx6325

On Sun, Aug 02, 2009 at 04:19:47PM +0200, Rafael J. Wysocki wrote:
> Hi Matthew,
> 
> As reported at
> 
> http://bugzilla.kernel.org/show_bug.cgi?id=13891
> 
> there is a problem with allocating PCI resources on HP nx6325 introduced by
> your commit a76117dfd687ec4be0a9a05214f3009cc5f73a42
> (x86: Use pci_claim_resource).
> 
> On this particular box it causes the audio adapter's PCI memory space to
> be allocated for something else.

Could you also attach lspci -v?  It seems that the 0000:00:12.0 resource
is nesting inside the 0000:00:14.2 resource, which is just not possible.

Also, could you boot -rc5 (without
a76117dfd687ec4be0a9a05214f3009cc5f73a42 reverted) with this patch
applied?  It may give us some idea of what's going wrong.

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index ec80b88..3f422db 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -105,6 +105,10 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
 
 	root = pci_find_parent_resource(dev, res);
 
+if (root)
+ printk("Inserting resource %s %pR (BAR %d) inside resource %s %pR\n", res->name, res, resource, root->name, root);
+else
+ printk("No parent found for resource %s %pR\n", res->name, res);
 	err = -EINVAL;
 	if (root != NULL)
 		err = insert_resource(root, res);

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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