linux-kernel - Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit mmio

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Date:	Fri, 10 Jan 2014 11:19:14 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] PCI: Only enable realloc auto when root bus has 64bit
 mmio

On 12/11/2013 02:55 PM, Yinghai Lu wrote:
> On Wed, Dec 11, 2013 at 11:19 AM, Joseph Salisbury
> <joseph.salisbury@...onical.com> wrote:
>> On 12/09/2013 03:10 PM, Yinghai Lu wrote:
>>> On Mon, Dec 9, 2013 at 11:42 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>>>> That doesn't answer my question at all.
>>>>
>>>> I understand that this change makes it so Joseph doesn't have to use
>>>> "pci=realloc=off".  But why should auto-reallocation be limited to
>>>> buses that have resources above 4GB?  That doesn't make any sense.
>>>>
>>>> We should fix the reallocation code so it can deal with this case.  If
>>>> there's not enough space for everything, obviously we have to leave
>>>> something unassigned.  A ROM BAR is a good candidate for leaving
>>>> unassigned, because most of the time we can get along without it.
>>> Yes, that is ideal and not that simple.
>>> but that would be hard to backport to old kernels.
>>>
>>> BTW, Joseph, can you try
>>> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
>>> for-pci-3.14
>>> with pci=realloc=on
>>>
>>> on that system?
>>>
>>> Thanks
>>>
>>> Yinghai
>> I noticed there was some back and forth on this thread.  Do you still
>> want me to test this version, Yinghai?
> Yes, if that works, we would not need to put the patch in upstream for limiting
> realloc auto scope.
>
> Thanks
>
> Yinghai

Another user has confirmed that at test kernel from your branch[0] does
resolve the bug.

Thanks,

Joe

[0]

git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git

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