Re: Using netconsole for debugging suspend/resume
- From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- Date: Tue, 13 Jun 2006 08:18:19 +0100
On Mon, Jun 12, 2006 at 10:03:46PM -0700, David Miller wrote:
From: Andi Kleen <ak@xxxxxxx>
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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