Re: Prefered method to map PCI memory into userspace.

[Joe Korty]

On Fri, Sep 26, 2003 at 01:53:43PM -0700, Jim Deas wrote:
> I am looking for the most current (blessed) structure
> for mapping PCI memory to a user process. One that allows
> both PIO and busmastering to work on a common block of
> PCI RAM. I am not concerned with backporting to older
> kernels but it would be nice if the solution wasn't ibm specific.
> 
> My problem is a 64M window into a frame buffer that I would
> like to map into user space. I am more than willing to put
> forth the effort, I just want to make sure I'm heading in
> the right direction.
> 
> Is there a better forum for posting this? Regards,
> J. Deas
> 
> RH9.0 2.4.20-6smp kernel and above.

Albert Cahalan wrote a patch, for 2.6, that makes mmappable all PCI device
memory regions.  They show up as files in the appropriate subdirectories
under /proc/bus/pci.  See http://lkml.org/lkml/2003/7/13/258 for the
patch and details.

Joe
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