linux-kernel - Re: Bad DMA from Marvell 9230

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Date:	Fri, 30 May 2014 20:37:58 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jérôme Carretero <cJ-ko@...gloub.eu>
Cc:	Tejun Heo <tj@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Bad DMA from Marvell 9230

On Fri, 2014-05-30 at 03:06 -0400, Jérôme Carretero wrote:
> On Thu, 27 Mar 2014 17:57:37 +1100
> Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
> > I've been trying a 9230 on a power box here (a 9235 on the same
> > machine works fine) and it blows up with an IOMMU violation early
> > during init.
> 
> Hi,
> 
> That's https://bugzilla.kernel.org/show_bug.cgi?id=42679
> if you haven't already found it.

Somewhat... It's not the phantom function, the error I capture in my
IOMMU shows that it's trying to read from address 0 which is unmapped
but with the right initiator.

This device is a pile of crap. We've talked to Marvell support channel,
sent driver traces etc... but they didn't admit anything.

We've switched to a 9235 instead which seems to work fine.

Cheers,
Ben.


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