linux-kernel - Re: PCI BAR1 Unassigned

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Message-ID: <sig.2120ee738f.4DD59E71.1030705@radicalsystems.co.za>
Date:	Fri, 20 May 2011 00:49:21 +0200
From:	Jan Zwiegers <jan@...icalsystems.co.za>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: PCI BAR1 Unassigned

On 2011-05-20 12:38 AM, Bjorn Helgaas wrote:
> On Thu, May 19, 2011 at 4:20 PM, Jan Zwiegers<jan@...icalsystems.co.za>  wrote:
>> On 2011-05-20 12:13 AM, Bjorn Helgaas wrote:
>>>
>>> On Thu, May 19, 2011 at 2:27 PM, Jan Zwiegers<jan@...icalsystems.co.za>
>>>   wrote:
>>>>
>>>> On 2011-05-19 08:50 PM, Bjorn Helgaas wrote:
>>>>>
>>>>> On Thu, May 19, 2011 at 10:28 AM, Jan Zwiegers<jan@...icalsystems.co.za>
>>>>>   wrote:
>>>>>>
>>>>>> I have the problem below where my PCI card's second BAR does not get
>>>>>> assigned.
>>>>>> What can be the cause of this problem?
>>>>>> The last kernel I tested on which worked OK was 2.6.27.
>>>>>> My current problematic kernel 2.6.35.
>>>>>>
>>>>>> 05:01.0 Unassigned class [ff00]: Eagle Technology PCI-703 Analog I/O
>>>>>> Card
>>>>>> (rev 5c)
>>>>>>     Flags: bus master, slow devsel, latency 32, IRQ 22
>>>>>>     Memory at 93b00000 (type 3, prefetchable) [size=2K]
>>>>>>     Memory at<unassigned>      (type 3, prefetchable)
>>>>>>     Capabilities: [80] #00 [0600]
>>>>>>     Kernel modules: pci703drv
>>>>>
>>>>> Could be resource exhaustion or, more likely, we ran out because we
>>>>> now assign resource to things that don't need them, leaving none for
>>>>> things that *do* need them.  This sounds like a regression, so we
>>>>> should open a bugzilla for it and attach dmesg logs from 2.6.27 and
>>>>> 2.6.35.
>>>>>
>>>>> Does this problem keep the driver from working?  (Sometimes drivers
>>>>> don't actually use all the BARs a device supports.)
>>>>
>>>> I'm the maintainer of the driver and was involved in the development of
>>>> the
>>>> board as well in 2003. The board uses two BARS and the second BAR is the
>>>> most important. The board worked fine since the 2.4 days and only
>>>> recently
>>>> became problematic. I suspect it works on even later kernels than 27,
>>>> maybe
>>>> 2.6.32.
>>>>
>>>> My knowledge is too little to actually determine if the problem is
>>>> because
>>>> the FPGA based PCI interface is not within spec or something that changed
>>>> in
>>>> the kernel, because of the post .30 releases becoming more strict to PCI
>>>> specification, i.e. BIOS / Kernel interaction.
>>>
>>> Well, let's at least look at the working and broken dmesg logs.  My
>>> money is on kernel breakage.  If it used to work, it should still
>>> work.
>>
>> What do you need from me? I have at least 3 machines on which it used to
>> work and is now running a later kernel. I can post dmesg from both .27 and
>> .35. Will do tomorrow when I'm back at the office.
>
> Since you don't have continuous access to the machines, maybe you can
> collect the /proc/iomem and "lspci -v" output at the same time you
> collect the dmesg logs.  That should be enough to get started.
>
> Thanks,
>    Bjorn
>
OK I will do.

Should I post the whole dmesg log, or just the relevant sections?

Thanks!!
Jan
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