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

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Message-ID: <4BD86D05.20402@oracle.com>
Date:	Wed, 28 Apr 2010 10:14:45 -0700
From:	Yinghai Lu <yinghai.lu@...cle.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"H. Peter Anvin" <hpa@...or.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,
	"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

Never mind, for 2.6.34 your patch should be good enough.

On 04/28/2010 09:07 AM, Bjorn Helgaas wrote:
> Yinghai, ping, do you have any more information about this?
>
> On Tuesday 27 April 2010 09:11:10 am Bjorn Helgaas wrote:
>   
>> On Monday 26 April 2010 07:41:55 pm Yinghai wrote:
>> But let's double-check this:
>>
>>     
>>> also find one AMD system:
>>> [    7.056011] pci_root PNP0A03:00: host bridge window [mem 0xfed20000-0xffffffff]
>>> ...
>>> pci assign unassign code could use range like [mem 0xfed20000-0xffffffff] wrongly.
>>>       
>> I agree, it's very unlikely that it's safe to put PCI devices all the
>> way up to 0xffffffff.  I suspect this might be fixed by d558b483d5a,
>> which computes the end of the bridge window using _MAX rather than _LEN.
>>
>> See https://bugzilla.kernel.org/show_bug.cgi?id=15480#c15 for an example
>> similar to the one above: we originally thought the window was
>> [mem 0xcff00000-0xffffffff], but d558b483d5a changes that to
>> [mem 0xcff00000-0xfebfffff], which matches what Windows found.
>>
>> Yinghai, can you take a look at your AMD system again with a kernel that
>> includes d558b483d5a, and see whether we still have a problem?  If we
>> *do* still have a problem, please open a bugzilla and attach a dmesg log
>> with ACPI resource info collected with the debug patch here:
>> https://bugzilla.kernel.org/show_bug.cgi?id=15533#c5
>>
>> Bjorn
>>
>>     
>
>   

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