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From: Scott <linux-kernel@bluecamel.eml.cc>
Subject: Re: cx88 pci_abort messages
Date: Mon, 8 Oct 2007 07:43:09 -0400
To: Gerd Hoffmann <kraxel@redhat.com>, linux-kernel@vger.kernel.org
Sender: linux-kernel-owner@vger.kernel.org
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On Oct 8, 2007, at 3:44 AM, Gerd Hoffmann wrote:

> Scott wrote:
>> On Sat, 2007-10-06 at 12:48 -0600, Robert Hancock wrote:
>>>>> Oct  2 21:59:32 htpc cx88[0]: irq mpeg  [0x80000] pci_abort*
>>>>> Oct  2 21:59:32 htpc cx88[0]/2-mpeg: general errors: 0x0008000
>
>> I assumed it was an interrupt issue based on the 'irq mepg' error,  
>> not a
>> DMA issue.
>
> It's a DMA issue.  The chip raised an irq to signal the error  
> condition
> to the driver, thats why it is printed by the irq handler.  Happened
> while streamimg mpeg data.
>
> Havn't looked at the code for years now, but IIRC the 0x800000 is the
> raw error code from some status register, pci_abort is the error  
> bit in
> clear text, meaning some PCI DMA transfer was aborted.  No idea why
> though ...

I went through and did the basics. Disabled SMP (it's a core 2 duo  
cpu), tried with noapic, nolapic settings, tried with pci=irqroute,  
and tried with acpi=off. Poking through the module code I noticd in  
cx88-mpeg.c the irq_debug option. I think this is the debug switch I  
want so I'll try to gather more info this week. At the very least it  
looks like it will help me walk through the code to get a better idea  
of what's going on.

--
Scott

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