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From: Bjorn Helgaas <bhelgaas@google.com>
Date: Fri, 1 Jun 2012 17:06:51 -0600
Message-ID: <CAErSpo7NF3bdF6hEx1_zF7f5oTv4wp4td4AaHzp=W=S-W_v07Q@mail.gmail.com>
Subject: Re: PCI resources above 4GB
To: Steven Newbury <steve@snewbury.org.uk>
Cc: Yinghai Lu <yinghai@kernel.org>, linux-pci@vger.kernel.org,
	DRI mailing list <dri-devel@lists.freedesktop.org>
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On Tue, May 29, 2012 at 5:19 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> On Mon, May 21, 2012 at 11:27 AM, Steven Newbury <steve@snewbury.org.uk> wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> On 18/05/12 10:08, Yinghai Lu wrote:
>>> On Fri, May 18, 2012 at 12:45 AM, Yinghai Lu <yinghai@kernel.org>
>>> wrote:
>>>> On Thu, May 17, 2012 at 9:36 AM, Yinghai Lu <yinghai@kernel.org>
>>>> wrote:
>>>>> On Thu, May 17, 2012 at 5:34 AM, Steven Newbury
>>>>> <steve@snewbury.org.uk> wrote:
>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Strange, the busn branch
>>>>>> is merged with for-pci-res-alloc, but for some reason it
>>>>>> isn't working.  Only the bridge is detected, not the devices
>>>>>> behind it.
>>>>>
>>>>> Can you post the boot log ? maybe recently reordering patches
>>>>> applying sequence break it.
>>>>
>>>> Never mind, found the problem.
>>>
>>> updated for-pci-res-alloc branch. please check it.
>>>
>> Tested and working fine now.
>
> Can you attach dmesg logs without Yinghai's patches (where I assume it
> doesn't work) and with them (where it *does* work) to the bugzilla?  I
> assume https://bugzilla.kernel.org/show_bug.cgi?id=10461 is still the
> relevant report.
>
> I'm confused because I thought your _CRS showed no apertures above
> 4GB, and I'm trying to figure out how Yinghai's patches can help if
> that's the case.

Your _CRS *doesn't* show any apertures above 4GB, but you're booting
with "pci=nocrs", so we ignore them anyway.  Doing hotplug with
"pci=nocrs" is not a supportable proposition.

Patches that help in the "pci=nocrs" case might be acceptable, but
only if there is clearly no risk to the "pci=use_crs" case.