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From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Mark Lord <liml@rtr.ca>,
	jeff@garzik.org, davej@redhat.com, linux-ide@vger.kernel.org
Subject: Re: [PATCH] libata: Add pata_dma option so users can disable pata_dma as they can with old-ide
Date: Sat, 23 Jun 2007 19:41:34 +0200	[thread overview]
Message-ID: <200706231941.34557.bzolnier@gmail.com> (raw)
In-Reply-To: <20070622202610.3b805cfe@the-village.bc.nu>


Hi,

On Friday 22 June 2007, Alan Cox wrote:
> > > I think a /sys/ "dma" attribute (pick a name) might be most appropriate,
> > > or we just just implement HDIO_[GS]ET_DMA as a simpler/lazier mechanism.
> > 
> > The problem is that libata lacks any locking needed for having this
> > (and other useful) settings tunable on per device basis.
> 
> Actually libata does have the paths for it and uses them when drives are
> hotplugged. Tejun posted an explanation of how to implement it a while
> ago when I proposed a totally bogus implementation - it has to be done
> via the EH code.

I must have missed the original discussion.

> So we'd add user mode masks to each device and the sysfs nodes would
> update that mask and trigger the EH processing to halt activity, retune
> the disks and continue

Sounds good.

Thanks,
Bart

      reply	other threads:[~2007-06-23 17:52 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-22 13:49 [PATCH] libata: Add pata_dma option so users can disable pata_dma as they can with old-ide Alan Cox
2007-06-22 15:01 ` Mark Lord
2007-06-22 15:52   ` Alan Cox
2007-06-22 16:53     ` Mark Lord
2007-06-22 19:04       ` Bartlomiej Zolnierkiewicz
2007-06-22 19:26         ` Alan Cox
2007-06-23 17:41           ` Bartlomiej Zolnierkiewicz [this message]

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