linux-kernel - Re: data corruption with nvidia chipsets and IDE/SATA drives (k8 cpu errata needed?)

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Date:	Mon, 12 Mar 2007 10:56:24 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <ak@...e.de>
CC:	Robert Hancock <hancockr@...w.ca>, linux-kernel@...r.kernel.org,
	Chip Coldwell <coldwell@...hat.com>
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives (k8
 cpu errata needed?)

Andi Kleen wrote:
> in Linux. Apparently in some cases sata_nv does DMA on an already freed and then
> reused mapping.

Any data or additional info on that?  Did you discover this by tracking 
the DMA API software routines, or something lower level (like a bus 
analyzer)?

libata handles all the DMA allocation and mapping and cleanup for 
sata_nv, so any software problem would affect the whole of libata.

But it's possible that the nForce SATA chip has DMA padding needs that 
are different from those provided by libata-core (grep for "pad"), which 
could create a situation where the hardware continues DMA'ing past the 
end of the DMA area.

	Jeff

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