From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: ralphc@pathscale.com
Cc: David Miller <davem@davemloft.net>,
rdreier@cisco.com, rolandd@cisco.com, openib-general@openib.org,
linux-kernel@vger.kernel.org
Subject: Re: Suggestions for how to remove bus_to_virt()
Date: Thu, 13 Jul 2006 09:45:53 +0200 [thread overview]
Message-ID: <44B5FA31.9030309@s5r6.in-berlin.de> (raw)
In-Reply-To: <20060712.174013.95062313.davem@davemloft.net>
David Miller wrote:
> If you need device level DMA mapping semantics, create them for your
> device type. This is what USB does, btw.
Ralph,
two other examples where drivers provide some sort of address lookup are:
- drivers/ieee1394/dma.[hc]
AFAIK this deals with housekeeping of ringbuffers as used by
1394 controllers for isochronous transmit and receive. Users of
this little API are dv1394, video1394, ohci1394.
- patch "dc395x: dynamically map scatter-gather for PIO" by
Guennadi Liakhovetski,
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cdb8c2a6d848deb9eeefffff42974478fbb51b8c
This mapping is not specific to SCSI. The user is a driver which
mixes PIO and DMA.
I don't know if these have any similarity to your requirements though.
(I too need to come up with either a portable replacement of bus_to_virt
or with a fundamentally different implementation but haven't started my
project yet. This occurrence of bus_to_virt is in drivers/ieee1394/sbp2
but #ifdef'd out by default.)
--
Stefan Richter
-=====-=-==- -=== -==--
http://arcgraph.de/sr/
next prev parent reply other threads:[~2006-07-13 7:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-12 23:29 Ralph Campbell
2006-07-12 23:40 ` David Miller
2006-07-13 0:11 ` Roland Dreier
2006-07-13 0:40 ` David Miller
2006-07-13 5:46 ` [openib-general] " Muli Ben-Yehuda
2006-07-14 22:27 ` Ralph Campbell
2006-07-14 22:35 ` David Miller
2006-07-14 23:45 ` Ralph Campbell
2006-07-15 13:42 ` Stefan Richter
2006-07-13 7:45 ` Stefan Richter [this message]
2006-07-13 16:02 ` Roland Dreier
2006-07-13 16:37 ` Ralph Campbell
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