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

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Date:	Wed, 5 Aug 2009 09:38:52 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Manuel Lauss <mano@...rinelk.homelinux.net>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Wilcox <willy@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Patterson <andrew.patterson@...com>
Subject: Re: [Regression] PCI resources allocation problem on HP nx6325



On Wed, 5 Aug 2009, Linus Torvalds wrote:
> 
> So I think I understand the behavior on your box, and the warning was 
> actually correct and useful - our PCI layer is being stupid. We should 
> mark ROM resources as being prefetchable.
> 
> Hmm.. We do seem to _try_ do exactly that in pci_read_bases(). I wonder 
> what I'm missing, and where that bit is then cleared. Or whether we're 
> doing that ROM BAR probe somewhere else too..

Manuel, could you compile your kernel with CONFIG_PCI_DEBUG enabled, and
then boot it with "pci=earlydump", and send me the dmesg of a kernel boot? 

You may need to make sure that CONFIG_LOG_BUF_SHIFT is big enough to get 
it all, and perhaps use "dmesg -s 1000000" (some versions of dmesg will 
truncate the result to 64kB or something by default, and depending on just 
how verbose your boot ends up being, you migth lose things).

			Linus
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