Re: Userspace DMA

[Alex Bennee <kernel-hacker@bennee.com>]

Now my mailer is fixed :-)

-----Forwarded Message-----
> From: Alex Bennee <kernel-hacker@bennee.com>
> To: Peter Chubb <peter@chubb.wattle.id.au>
> Cc: public@mikl.as, Linux Mailing List <linux-kernel@vger.kernel.org>
> Subject: Re: Userspace DMA
> Date: Mon, 17 Nov 2003 10:37:40 +0000
> 
> On Mon, 2003-11-17 at 04:34, Peter Chubb wrote:
> > >>>>> "Andrew" == Andrew Miklas <public@mikl.as> writes:
> > Andrew> Hi, Is there an accepted way of doing userspace DMA with
> > Andrew> Linux?
> > 
> > I'm currently working on a framework for user-space device drivers,
> > that allow suitably privileged user-space programs to set up and tear
> > down dma regions 
> 
> Hi,
> 
> I've also been doing some work on allowing user processes to access the
> DMA hardware facilities of the processor platform. This is not actually
> aimed at pci stuff but used for other devices on the embedded SH board I
> use. It works using a packetised writev interface to send DMA requests
> to kernel space where the mapping of memory is done. It really works
> best with scatter gather dma as user-pages can be spread out all over
> the place.
> 
> Whether there is any overlap between my approach, what your doing and
> what Andrew is looking for I have no idea :-) I'm certainly interested
> in seeing any code if only for ideas.
> 
> You can find an alpha (but working on my system) copy of the code at:
> 
> http://www.bennee.com/~alex/software/kernel/index.php
-- 
Alex, homepage: http://www.bennee.com/~alex/
I used to get high on life but lately I've built up a resistance.