Messages in this thread | | | Date | Thu, 1 Aug 2013 13:19:46 +0100 | From | David Vrabel <> | Subject | Re: [PATCH v2 RFC 7/8] swiotlb-xen: support autotranslate guests |
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On 31/07/13 20:54, Stefano Stabellini wrote: > Support autotranslate guests in swiotlb-xen by keeping track of the > phys-to-bus and bus-to-phys mappings of the swiotlb buffer > (xen_io_tlb_start-xen_io_tlb_end). > > Use a simple direct access on a pre-allocated array for phys-to-bus > queries. Use a red-black tree for bus-to-phys queries.
It would be nice if the dma_map_page() etc. returned a unique handle in addition to the dma_addr_t so the lookup on unmap could be cheaper, but in the absence of this.
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
David
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