From: Dan Malek <dan@embeddededge.com>
To: John Whitney <johnw@sands-edge.com>
Cc: Christoph Hellwig <hch@lst.de>, linuxppc-dev@lists.linuxppc.org
Subject: Re: Proposed changes to io.h
Date: Wed, 31 Mar 2004 16:49:20 -0500 [thread overview]
Message-ID: <406B3CE0.2050600@embeddededge.com> (raw)
In-Reply-To: A973047C-8357-11D8-9FF0-000A95A07384@sands-edge.com
John Whitney wrote:
> ..... Shouldn't some care
> be taken to ensure that ANY virtual address passed to these routines
> maps to the correct physical (bus) address?
Don't go there. This has been discussed over and over in the past
and as Matt said, this is not the place. Read the archives if
you want to see these discussions.
The code works according to the documentation, and the implementation
of the pci_*/dma_* functions allows the flexibility we need to support
systems where the mapping is more challenging. The kernel and drivers
should not be directly using virt_to_bus() and all of its cousins, they
should use the DMA mapping functions documented.
-- Dan
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2004-03-31 21:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-31 15:44 Proposed changes to io.h John Whitney
2004-03-31 16:44 ` Eugene Surovegin
2004-03-31 16:58 ` Dan Malek
2004-03-31 17:30 ` Matt Porter
2004-03-31 17:32 ` John Whitney
2004-03-31 17:40 ` Dan Malek
2004-03-31 17:03 ` Matt Porter
2004-03-31 19:57 ` John Whitney
2004-03-31 22:07 ` Matt Porter
2004-03-31 22:25 ` John Whitney
2004-03-31 22:52 ` Dan Malek
2004-04-01 5:30 ` Kumar Gala
2004-03-31 17:01 ` Matt Porter
2004-03-31 17:29 ` Dan Malek
2004-03-31 18:18 ` Christoph Hellwig
2004-03-31 18:40 ` John Whitney
2004-03-31 18:43 ` Christoph Hellwig
2004-03-31 18:50 ` John Whitney
2004-03-31 21:09 ` John Whitney
2004-03-31 21:49 ` Dan Malek [this message]
2004-03-31 21:52 ` Eugene Surovegin
2004-03-31 22:07 ` John Whitney
2004-04-01 2:52 ` Benjamin Herrenschmidt
[not found] ` <209F76E4-838B-11D8-9FF0-000A95A07384@sands-edge.com>
[not found] ` <1080790433.1433.59.camel@gaston>
[not found] ` <43B0E668-84BC-11D8-9FF0-000A95A07384@sands-edge.com>
2004-04-03 3:04 ` Benjamin Herrenschmidt
2004-04-03 3:40 ` John Whitney
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