linux-kernel - Re: [PATCH]: x86_64, audio: Fix system panic when DMA

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Message-ID: <5182B790.6090907@sgi.com>
Date:	Thu, 02 May 2013 11:59:28 -0700
From:	Mike Travis <travis@....com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	David Henningsson <david.henningsson@...onical.com>,
	Stephen Warren <swarren@...dia.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH]: x86_64, audio: Fix system panic when DMA > 40 bits



On 5/2/2013 11:20 AM, Stephen Warren wrote:
> On 05/02/2013 12:20 AM, David Henningsson wrote:
>> On 05/01/2013 09:04 PM, Mike Travis wrote:
>>> The audio driver mistakenly allows 64 bit addresses to be created for
>>> the audio driver on Nvidia GPUs.  Unfortunately, the hardware normally
>>> only supports up to 40 bits of DMA.  This can cause system panics as
>>> well as misdirected data when the address is > 40 bits as the upper
>>> part the address is truncated.
>>
>> Thanks for this patch. Stephen Warren, is this something you can
>> confirm/deny, and do you know what range of hardware this actually
>> applies to?
> 
> It's certainly plausible that the GPU's internal physical addresses are
> less than a full 64-bits, and this probably affects PCI accesses too.
> 

I haven't noticed any other problems with MMIOH accesses.  The
problem of DMA32 addresses certainly affects us though audio is
not a high priority on UV(*) except in specific applications (like
Media Servers, etc.]  Accesses to the GPU and GPGPU are much more
common.

(* http://www.sgi.com/products/servers/uv/)
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