Re: [Xen-devel] pci adapter not working in dom0. works under plain Linux.

[James Harper <james@xxxxxxxxxxxxxxxxx>]

> 
> > I had some preliminary patches for the V4L API to use a better
> > DMA ops, but I fear that they are bitrotten (and I can't even
> > find them!). But lets try first determine if the workarounds
> > work for you.
> 
> Were you by any means referring to this thread / patch:
> http://lists.xen.org/archives/html/xen-devel/2012-01/msg01982.html ?
> 

That patch applies and compiles once you take into account some moved files. I 
haven't tested yet though - my mythtv box is busy recording :)

I notice there is a 'videobuf2-dma-sg.c' file in the current tree, which I 
assume is a 'second generation' v4l implementation that drivers will be 
progressively moved over to. I can't tell if the dma implementation in there is 
correct, but it certainly doesn't return any hits in a grep for 32...

A grep for the export 'vb2_dma_sg_memops' only shows up 2 drivers using it 
though. What's the procedure around rebasing and submitting a patch that 
someone else wrote?

I think Konrad's fix is the right way to go. Someone else suggested fixing 
vmalloc32, which is probably still a good idea, but when most of the devices 
these days are probably quite happy with 64 bit addresses so sticking with the 
artificial 4G limit is probably a bit silly.

I'll follow up once I've tested later tonight or tomorrow.

Thanks!

James


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