linux-kernel - Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"

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Message-ID: <46B5824B.1000103@s5r6.in-berlin.de>
Date:	Sun, 05 Aug 2007 09:54:51 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Robert Hancock <hancockr@...w.ca>, linuxppc-dev@...abs.org,
	Olaf Hering <olh@...e.de>, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA	mapping"

Benjamin Herrenschmidt wrote:
>>> If setting 32-bit DMA mask fails on ppc64, that sounds like a problem
>>> with the DMA implementation on that architecture. There are enough cards
>>> out there that only support 32-bit DMA that this really needs to work..
>> Yes, could the PPC folks please have a look at it?  Thanks.
> 
> Smells like we may have a bug there. No worries though, all current PPC
> machines have an iommu that will not give out addresses above 32 bits
> anyway, but I'll double check what's up.
> 
> Do you see something in dmesg when that happens ?

There was nothing in Olaf's report, except for trouble in sbp2 _after_
the failure.  http://lkml.org/lkml/2007/8/1/344  (I don't have a PMac.)
-- 
Stefan Richter
-=====-=-=== =--- --=-=
http://arcgraph.de/sr/
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