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

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Message-ID: <4BD23D01.2080303@oracle.com>
Date:	Fri, 23 Apr 2010 17:36:17 -0700
From:	Yinghai Lu <yinghai.lu@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Andy Isaacson <adi@...apodia.org>,
	"R. Andrew Bailey" <bailey@...mai.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 04/23/2010 04:44 PM, H. Peter Anvin wrote:
> On 04/23/2010 04:05 PM, 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.
>>
>>     
> This certainly wins from a simplicity standpoint!
>
>   
indeed.


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