On Mon, Jun 12, 2006 at 10:03:46PM -0700, David Miller wrote:
> From: Andi Kleen <[email protected]>
> Date: Tue, 13 Jun 2006 06:54:14 +0200
>
> > I guess if you use 1394 with remote DMA for other protocols (like
> > video etc.) there must be some way for the subsystem to map
> > the memory even on IOMMU systems. I admit I haven't dived that
> > deeply into the 1394 subsystem so I don't know how that works.
>
> Video-1394 has it's own driver, which does a consistent DMA
> allocation, and then maps that into userspace using remap_pfn_range().
> Entirely portable.
That's actually not portable to certain arm platforms, but that's
a different story.
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