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

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Message-id: <464258C9.7040405@shaw.ca>
Date:	Wed, 09 May 2007 17:27:05 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Ben Collins <ben.collins@...ntu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Cleanup libata HPA support

Ben Collins wrote:
> 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.

Curious.. Do you have some output or other details from what was 
actually returned? Also was this on more than one drive model?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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