linux-kernel - Re: Dropped IRQ disables Radeon 3D

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Message-ID: <15f2d51a1ab5412a9d7c327ab67b8166-mfwitten@gmail.com>
Date:	Fri, 15 Jul 2011 10:53:41 -0000
From:	Michael Witten <mfwitten@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Arnuschky <arnuschky@...on.de>, linux-kernel@...r.kernel.org
Subject: Re: Dropped IRQ disables Radeon 3D

On Fri, 15 Jul 2011 19:09:44 +1000, Benjamin Herrenschmidt wrote:

> On Fri, 2011-07-15 at 08:20 +0000, Michael Witten wrote:
>> 
>> Arnuschky wrote to me about this related Debian bug report:
>> 
>>   Fri, 2010-06-18 10:21:05 +0000
>>   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586312
>> 
>> I popped over to #radeon on freenode where user agd5f told me to
>> try the following on the kernel command line:
>> 
>>   pci=nomsi
>> 
>> After reading about MSIs and the requisite CONFIG_* settings, I
>> realized that I didn't even have MSI support in the kernel anyway.
>> Then agd5f suggested the following patches by Benjamin Herrenschmidt
>> might be of help:
>
> Another problem I noticed is some cards, when not using MSIs, still seem
> to shoot an MSI with whatever value was last programmed into the MSI
> configuration space. Can you check with lspci -vv if there's a non-0
> value in there ? It -could- be that your get bogus MSIs.

So, you want me to boot my Linux version that doesn't have MSI support
and check whether `sudo lspci -vv' says that it is using MSIs?
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