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xen-devel
Re: [Xen-devel] USB virt status --- Help please!!!
On Mon, 2005-11-14 at 09:56 +0000, Keir Fraser wrote:
> On 13 Nov 2005, at 18:28, Harry Butterworth wrote:
>
> > Is this the right approach? Is the check in dma_map_single overzealous?
>
> When running on Xen, just because Linux has allocated adjacent pages
> from its 'physical' memory map, doesn't mean they really are physically
> contiguous. For I/O we have to go to extra effort to really allocate
> truly contiguous multi-page extents.
>
> So your code is correct. If you can preallocate buffers then you could
> do that with dma_alloc_coherent and that would guarantee contigous
> buffers....
I'm given the buffers by the assorted USB drivers. I could stage the
data using memcpy into my own buffer allocated using dma_alloc_coherent.
Or should I go through all the USB drivers and change the buffer
allocation?
>
> -- Keir
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
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