From: Eugene Surovegin <ebs@ebshome.net>
To: "Michael R. Zucca" <mrz5149@acm.org>
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, 1 Apr 2004 14:00:18 -0800 [thread overview]
Message-ID: <20040401220018.GA4130@gate.ebshome.net> (raw)
In-Reply-To: <406C8104.9050609@acm.org>
On Thu, Apr 01, 2004 at 03:52:20PM -0500, Michael R. Zucca 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.
well, DMA API we are talking about handles only device <-> system memory, so
only _one_ device (which is currently done) is need.
> Between any two sources and
> destinations there may be several intervening bridges, which potentially
> means programming those bridges and/or doing several address translations.
In case of several bridges, I think it's simpler just to assign _different_
buses for each bus connected by a bridge.
Eugene.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2004-04-01 22:00 UTC|newest]
Thread overview: 37+ 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
2004-04-02 1:22 ` Benjamin Herrenschmidt
2004-04-01 20:52 ` Michael R. Zucca
2004-04-01 22:00 ` Eugene Surovegin [this message]
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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