linux-kernel - Re: [PATCH] ahci: add Marvell support (WIP)

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Message-ID: <46526216.2040000@garzik.org>
Date:	Mon, 21 May 2007 23:23:02 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"George T. Joseph (development)" <gtj.devel@...kin.com>
CC:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ahci: add Marvell support (WIP)

George T. Joseph (development) wrote:
> Hi Jeff,
> 
> Two issues with the patch...
> 
> msi has to be disabled for the Marvell or the driver load will throw a
> "nobody cared" message and eventually hang before discovering all the
> drives.
> 
> Light I/O works fine but heavy I/O generates 
> "exception Emask 0x0 Sact 0xb Serr 0x0 action 0x2 frozen"
> Then softreset and identify failures.
> Adding AHCI_FLAG_NO_NCQ to the flags fixes this.
> 
> I've been running with both these changes over your original patch for a
> few months now with no problems.  This is on a very heavily used 4 drive
> mdraid10 array.  

I poked Marvell about this, we'll see what they say.

If I don't hear anything useful, I'll push the no-MSI, no-NCQ version 
upstream.

	Jeff

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