linux-kernel - Re: fixing "pci=use

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Message-ID: <4AB50FF2.1070104@lwfinger.net>
Date:	Sat, 19 Sep 2009 12:08:02 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Gary Hade <garyhade@...ibm.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: fixing "pci=use_crs"

Bjorn Helgaas wrote:
> It looks like you have an HP box -- what exactly is it and
> what BIOS version do you have?  Maybe I can borrow one to play
> with myself so I don't have to bug you as much.

It is an HP dv2815nr. The BIOS is F.21. I understand that debugging
is much easier when you have the machine in hand, but I don't mind
providing information.

> You don't happen to have Windows on it also, do you?  If you do,
> I'd like to know what the device manager says about the PCI bridges.

The only Windows I have is on a VirtualBox VM. The machine came with
Vista, but it kept self destructing, thus I blew it away. I cannot do
it now as I am traveling, but I have a Bart's PE disk at home. I
should be able to look at the device manager picture with it.

> Your dmesg from LKML
> (http://thread.gmane.org/gmane.linux.kernel/856413/focus=856458)
> suggests that ACPI told us about a whole bunch of resources:
> 
>   pci_bus 0000:00: resource 0 io:  [0x00-0xcf7]
>   pci_bus 0000:00: resource 1 io:  [0xd00-0xffff]
>   pci_bus 0000:00: resource 2 mem: [0x0a0000-0x0bffff]
>   pci_bus 0000:00: resource 3 mem: [0x0c0000-0x0c3fff]
>   pci_bus 0000:00: resource 4 mem: [0x0c4000-0x0c7fff]
>   pci_bus 0000:00: resource 5 mem: [0x0c8000-0x0cbfff]
>   pci_bus 0000:00: resource 6 mem: [0x0cc000-0x0cffff]
>   pci_bus 0000:00: resource 7 mem: [0x0d4000-0x0d7fff]
>   pci_bus 0000:00: resource 8 mem: [0x0d8000-0x0dbfff]
>   pci_bus 0000:00: resource 9 mem: [0x0dc000-0x0dffff]
>   ...
> 
> but the new dmesg (http://bugzilla.kernel.org/attachment.cgi?id=23106)
> only has a few:
> 
>   pci_bus 0000:00: resource 0 io:  [0x00-0xffff]
>   pci_bus 0000:00: resource 1 mem: [0x000000-0xffffffffffffffff]
>   pci_bus 0000:01: resource 1 mem: [0xfc100000-0xfc1fffff]
>   pci_bus 0000:01: resource 3 io:  [0x00-0xffff]
>   pci_bus 0000:01: resource 4 mem: [0x000000-0xffffffffffffffff]
>   pci_bus 0000:06: resource 0 io:  [0x4000-0x4fff]
>   pci_bus 0000:06: resource 1 mem: [0xf8000000-0xfbffffff]
>   pci_bus 0000:04: resource 1 mem: [0xfc000000-0xfc0fffff]
> 
> The extra resources in the old dmesg could be from "pci=use_crs"
> being the default, but if that were the case, they should be in
> the PNP resource dump.  Did you update the BIOS between those
> boots?

No new BIOS. I'm still running the one that was in the machine when I
bought it. Do you want me to boot with "pci=use_crs"?

Larry



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