linux-kernel - Re: [regression] 2.6.23 sata_mv EH updates broke my 7042 controller

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Date:	Mon, 1 Oct 2007 21:30:01 -0500
From:	Olof Johansson <olof@...om.net>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [regression] 2.6.23 sata_mv EH updates broke my 7042 controller

On Mon, Oct 01, 2007 at 06:37:44PM -0400, Jeff Garzik wrote:
> Olof Johansson wrote:
>> Hardware config in my case:
>> Highpoint 2310 controller
>> PPC (big endian)
>> WD Raptor disk
>> Works fine with the other controller I've been using (SIL24), and works
>> fine if I revert the driver.
>> It also works fine if I disable the IOMMU. This would point towards
>> either a stale dma mapping, or a missing setup of one.
>> Not being much at home in the SATA drivers I could keep digging but I
>> figured I'd bring it up first in case it rings a bell for someone.
>
> The IOMMU data point is certainly interesting.  Nothing jumps out on a 
> re-review of the patch, so keep digging and let us know ;-)

Looks like it's caused by enabling vmerge (which tends to be on for the
common PPC defconfigs). If I disable it, things look OK.

Perhaps the Marvell controller doesn't like requests larger than 64K,
or wrapping some boundary. Do you have access to erratas/docs?

I have verified it on a powermac now as well (had a quick scare that it
might have been some problem with the PA Semi IOMMU, but no).


-Olof
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