linux-kernel - Re: PCI BAR1 Unassigned

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Date:	Thu, 19 May 2011 16:13:25 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jan Zwiegers <jan@...icalsystems.co.za>
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 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.
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