linux-kernel - Re: [PATCH] x86[-64] PCI domain support

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Message-ID: <451C54C0.6080402@garzik.org>
Date:	Thu, 28 Sep 2006 19:03:28 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Muli Ben-Yehuda <muli@...ibm.com>
CC:	Andrew Morton <akpm@...l.org>, Greg KH <greg@...ah.com>,
	Jim Paradis <jparadis@...hat.com>, Andi Kleen <ak@...e.de>,
	LKML <linux-kernel@...r.kernel.org>, jdmason@...zu.us
Subject: Re: [PATCH] x86[-64] PCI domain support

Muli Ben-Yehuda wrote:
> On Thu, Sep 28, 2006 at 05:45:41AM -0400, Jeff Garzik wrote:
>> Muli Ben-Yehuda wrote:
>>> On Tue, Sep 26, 2006 at 03:15:08PM -0400, Jeff Garzik wrote:
>>>> The x86[-64] PCI domain effort needs to be restarted, because we've got
>>>> machines out in the field that need this in order for some devices to
>>>> work.
>>>>
>>> This breaks the Calgary IOMMU, since it uses sysdata for other
>>> purposes (going back from a bus to its IO address space). I'm looking
>>> into it.
>> You'll need to modify struct pci_sysdata in 
>> include/asm-{i386,x86_64}/pci.h to include the data that you previously 
>> stored directly into the sysdata pointer.
> 
> Something like this should do the trick. Note - this should not be
> applied yet - after several gigabytes of network and disk activity it
> takes aic94xx down. More investigation required.

hmmmm.  What kernels did you test?

I would suggest testing

jgarzik/misc-2.6.git#master	-> vanilla Linux kernel
jgarzik/misc-2.6.git#pciseg	-> #master + PCI domain support
#pciseg + your patch

That should narrow down the problems.  A problem with aic94xx sorta 
sounds like something unrelated.


> diff -Naurp -X /home/muli/w/dontdiff pci-domains/arch/x86_64/kernel/pci-calgary.c linux/arch/x86_64/kernel/pci-calgary.c
> --- pci-domains/arch/x86_64/kernel/pci-calgary.c	2006-09-28 13:31:14.000000000 +0300
> +++ linux/arch/x86_64/kernel/pci-calgary.c	2006-09-28 13:14:38.000000000 +0300

ACK patch


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