From: Jeff Garzik <jgarzik@pobox.com>
To: Olof Johansson <olof@lixom.net>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [regression] 2.6.23 sata_mv EH updates broke my 7042 controller
Date: Tue, 02 Oct 2007 19:23:10 -0400 [thread overview]
Message-ID: <4702D2DE.1050504@pobox.com> (raw)
In-Reply-To: <20071002023000.GA19286@lixom.net>
Olof Johansson wrote:
> 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).
FWIW: I just tried the 6042 on my AMD64 platform with iommu=force, and
was unable to reproduce any trouble.
You could try changing MV_DMA_BOUNDARY to 0xffffU and see what happens.
I'll also look through my errata, to see what is different between 6042
and 7042, if anything.
Jeff
next prev parent reply other threads:[~2007-10-02 23:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-01 22:04 [regression] 2.6.23 sata_mv EH updates broke my 7042 controller Olof Johansson
2007-10-01 22:37 ` Jeff Garzik
2007-10-02 2:30 ` Olof Johansson
2007-10-02 23:23 ` Jeff Garzik [this message]
2007-10-03 1:45 ` [PATCH] libata: fix for sata_mv >64KB DMA segments Olof Johansson
2007-10-03 18:43 ` Jeff Garzik
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