From: "Michael R. Zucca" <mrz5149@acm.org>
To: Eugene Surovegin <ebs@ebshome.net>
Cc: John Whitney <jwhitney-linuxppc@sands-edge.com>,
Dan Malek <dan@embeddededge.com>,
Matt Porter <mporter@kernel.crashing.org>,
linuxppc-dev@lists.linuxppc.org
Subject: Re: Problems with dma_alloc_coherent()
Date: Thu, 01 Apr 2004 15:52:20 -0500 [thread overview]
Message-ID: <406C8104.9050609@acm.org> (raw)
In-Reply-To: <20040401191715.GC3786@gate.ebshome.net>
Eugene Surovegin wrote:
> On Thu, Apr 01, 2004 at 02:10:00PM -0500, John Whitney wrote:
> I think we should add such info to a structure which describes the _bus_, not
> _device_.
> I'm not "new-device-model" guru, so I cannot comment _how_ this can be
> implemented though :)
A bus description alone is not sufficient. A generic DMA API should take
both a source and destination device. Between any two sources and
destinations there may be several intervening bridges, which potentially
means programming those bridges and/or doing several address translations.
--
----------------------------------------------
Michael Zucca - mrz5149@acm.org
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"I'm too old to use Emacs." -- Rod MacDonald
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next prev parent reply other threads:[~2004-04-01 20:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 15:59 Problems with dma_alloc_coherent() John Whitney
2004-04-01 16:30 ` John Whitney
2004-04-01 16:51 ` Dan Malek
2004-04-01 17:01 ` Tom Rini
2004-04-01 17:05 ` Matt Porter
2004-04-01 17:51 ` John Whitney
2004-04-01 18:16 ` Matt Porter
2004-04-01 18:19 ` Eugene Surovegin
2004-04-01 18:33 ` Eugene Surovegin
2004-04-01 18:33 ` John Whitney
2004-04-01 18:40 ` Eugene Surovegin
2004-04-01 18:48 ` John Whitney
2004-04-01 18:55 ` Dan Malek
2004-04-01 18:59 ` Eugene Surovegin
2004-04-01 19:10 ` John Whitney
2004-04-01 19:17 ` Eugene Surovegin
2004-04-01 19:35 ` John Whitney
2004-04-01 20:52 ` Michael R. Zucca [this message]
2004-04-01 22:00 ` Eugene Surovegin
2004-04-01 22:39 ` Michael R. Zucca
2004-04-02 16:50 ` John Whitney
2004-04-02 18:50 ` Michael R. Zucca
2004-04-02 19:27 ` John Whitney
2004-04-02 20:20 ` Michael R. Zucca
2004-04-02 21:01 ` John Whitney
2004-04-03 7:54 ` Adrian Cox
2004-04-03 12:43 ` John Whitney
2004-04-05 9:05 ` Adrian Cox
2004-04-03 17:33 ` Brad Boyer
2004-04-03 23:17 ` Paul Mackerras
2004-04-04 8:15 ` Adrian Cox
2004-04-02 22:54 ` Paul Mackerras
2004-04-03 7:33 ` Adrian Cox
2004-04-04 22:56 ` Benjamin Herrenschmidt
2004-04-02 5:45 ` Christoph Hellwig
2004-04-01 20:49 ` Matt Porter
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