linux-kernel - Re: [PATCH] Cleanup libata HPA support

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Message-Id: <1178692170.6962.146.camel@cunning>
Date:	Wed, 09 May 2007 08:29:30 +0200
From:	Ben Collins <ben.collins@...ntu.com>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Cleanup libata HPA support

On Tue, 2007-05-08 at 08:46 -0600, Robert Hancock wrote:
> Ben Collins wrote:
> > The original HPA patch that Kyle worked on has gone into current git
> > without some fixes that we worked through late in the Ubuntu feisty
> > release. Here's the main copy of the notes I sent to Alan a few weeks
> > ago in regards to the original patch, and a repatch against current git
> > to fix things up. Note we have released feisty with the patch attached
> > (albeit we have HPA enabled by default), and we have not had any reports
> > directly attributed to it. However, in gutsy (devel for next release,
> > based on current stock linux-2.6.git), we are already seeing reports of
> > the same issues we already fixed. 
> > 
> > The issues we saw were mainly that some controllers didn't return the
> > correct size from the SET_MAX command (sata_nv is a good example). So I
> > added a re IDENTIFY after the SET_MAX, and compared all the numbers. If
> > re-id was correct, but return value from SET_MAX wasn't we print a
> > warning and use the IDENTIFY value regardless (since that's what the
> > device is going to use).
> > 
> > Because we re IDENTIFY, there was also no need to keep n_sectors_boot
> > around, so that was removed. The ata_hpa_resize() was changed to handle
> > everything in a single call (checks for HPA support of the device, and
> > whether ignore_hpa is set or not), and it also sets dev->n_sectors
> > before returning.
> > 
> > So far with this patch, we were able to fix all the problems we were
> > seeing with it (except the sata_nv issue where we had to revert to not
> > using adma for NO_DATA transactions, already reported to libata-dev).
> > We've not had any reports of further problems.
> 
> That sata_nv issue should not be present anymore in the current 
> libata-dev tree.

That's correct, it is not, at least the machine exception problem isn't.
However, the incorrect returns from SET_MAX are still an issue with that
hw. No idea what is causing it.

-- 
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Linux1394: http://wiki.linux1394.org/

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