linux-kernel - Re: cx88 pci

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <5FE0ADA0-553C-4372-9F85-D1C21C4D3A3D@bluecamel.eml.cc>
Date:	Mon, 8 Oct 2007 07:43:09 -0400
From:	Scott <linux-kernel@...ecamel.eml.cc>
To:	Gerd Hoffmann <kraxel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: cx88 pci_abort messages


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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/