linux-kernel - Re: [Bug #15124] PCI host bridge windows ignored (works with pci=use

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Message-ID: <4B5F32A9.7090105@kernel.org>
Date:	Tue, 26 Jan 2010 10:21:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jeff Garrett <jeff@...rrett.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Myron Stowe <myron.stowe@...com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [Bug #15124] PCI host bridge windows ignored (works with pci=use_crs)

On 01/26/2010 10:16 AM, Linus Torvalds wrote:
> 
> 
> On Tue, 26 Jan 2010, Bjorn Helgaas wrote:
>>
>> which IS big enough, and we know the bridge is in fact forwarding the
>> [mem 0xd0000000-0xdfffffff 64bit pref] region, because the Radeon works
>> when Jeff boots with "pci=use_crs".
> 
> I bet it's a subtractive decode thing. Sure, it could be just another 
> undocumented range register (does anybody have the datasheet for that 
> thing?) but Intel tends to often have subtractive decode.
> 
> That system in question has three PCI express root ports, but two of them 
> have IO and memory disabled according to the lspci info. So maybe it's as 
> simple as that "I/O Hub PCI Express Root Port 7" just catching anything 
> that nobody else does, and the single IOH host chip doing the same?
> 
>> I think we should remove intel_bus.c before .33.  It's breaking boxes
>> and we don't know how to fix it.  Even if we do find out how to fix it,
>> I think we should move toward using _CRS instead, because that's what
>> Windows uses and it's an easy way for the firmware to tell us about
>> platform quirks.
> 
> I suspect that for 33 it is indeed best to just revert. But somebody is 
> bound to have information on how the actual hardware works. Yinghai?

I have asked intel if there is any bit that could be enabled the routing.
there is no info about for their documentations.

Yinghai
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