linux-kernel - Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below BIOS

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Message-ID: <20100426125032.GA1623@akamai.com>
Date:	Mon, 26 Apr 2010 08:50:32 -0400
From:	"R. Andrew Bailey" <bailey@...mai.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Andy Isaacson <adi@...apodia.org>, Yinghai <yinghai.lu@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>, yaneti@...lera.com
Subject: Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below BIOS_END

On 23/04/10 17:05 -0600, Bjorn Helgaas wrote:
>On Wednesday 21 April 2010 01:31:20 pm Andy Isaacson wrote:
>> On Tue, Apr 20, 2010 at 10:33:50PM -0700, Yinghai wrote:
>> > Update e820 at first, and later put them resource tree.
>> > Reserved that early, will not be allocated to unassigned PCI BAR
>> >
>> > v3: remove probe_roms() that is not needed, because whole range is reserved
>> > 	 already
>>
>> Test booted this patch series on the problematic t3400, seems to work
>> fine.  dmesg attached to bug 15744.
>
>Thanks for testing (again).  I'm not confident that this series is
>going to be successful, so I started looking for other approaches.
>
>I can't reproduce the exact problem you're seeing, but in my
>kludged-up attempt, the patch below is enough to keep us from
>assigning the space below 1MB to a device.
>
>Would you guys (Andy & Andy, what a coincidence :-)) mind giving
>it a try?  This is intended to work on top of current upstream,
>with no other patches required.
>
>Bjorn
>

Good news- that solved it. I tried Yinghai's patches saturday to no
avail (sorry it took me so long to get back to you, I was about 5 bios
revisions behind on this machine and wanted to update it before I
tried any more tests).

  .andy
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