linux-kernel - Re: pci 0000:01:00.0: BAR 6: no parent found for of device [0xfffe0000-0xffffffff]

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Message-ID: <20090624130441.1c25c40e@jbarnes-g45>
Date:	Wed, 24 Jun 2009 13:04:41 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Justin Mattock <justinmattock@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: pci 0000:01:00.0: BAR 6: no parent found for of device
 [0xfffe0000-0xffffffff]

On Wed, 24 Jun 2009 13:50:30 -0600
Matthew Wilcox <matthew@....cx> wrote:

> On Wed, Jun 24, 2009 at 09:30:07PM +0200, Rafael J. Wysocki wrote:
> > (Adding CC to linux-pci)
> 
> Thanks Rafael.
> 
> > On Wednesday 24 June 2009, Justin Mattock wrote:
> > > (just pulled the latest git)
> > > And am seeing this:
> > 
> > Where pci 0000:01:00.0 and 0000:02:00.0 are what?
> > 
> > > [    0.696001] pci 0000:01:00.0: BAR 6: no parent found for of
> > > device [0xfffe0000-0xffffffff]
> 
> So the message is coming from pci_claim_resource, and
> if you bother to bisect, you'll track it back to my commit
> a76117dfd687ec4be0a9a05214f3009cc5f73a42 .  What's going on here,
> since this is BAR 6, is we have a ROM which has been mapped high, and
> then not unmapped.  The BAR doesn't fit in the parent's window, so
> the code is rightly declining to allocate the BAR.
> 
> Before my patch, we silently didn't allocate the BARs.  Now we print
> a message.  I wonder what to do ... we could silence this warning in
> pci_claim_resource (patch below).  Or we could declare this to be a
> bug, and fix it by disabling the ROM BAR (by clearing bit 0).
> 
> I'm agnostic ... anyone have any preferences?

Well, given that sometimes the ROM is important, it seems like an
error.  Really we should be smarter about re-allocating things as
necessary...

-- 
Jesse Barnes, Intel Open Source Technology Center
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