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

[Jesse Barnes]

On Wed, 24 Jun 2009 13:50:30 -0600
Matthew Wilcox <matthew@xxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/