Messages in this thread | | | Date | Wed, 2 Jul 2003 19:19:35 +0200 | From | Andi Kleen <> | Subject | Re: [RFC] block layer support for DMA IOMMU bypass mode II |
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On Wed, Jul 02, 2003 at 10:53:33AM -0600, Grant Grundler wrote: > > > Maybe I'm missing something but from James description it sounds like the > > block layer assumes that it can pass in a sglist with arbitary elements > > and get it back remapped to continuous DMA addresses. > > In the x86-64 case, If the 1k elements are not physically contigous, > I think most of them would get their own mapping.
Yes, but it won't be continguous in bus space.
> > For x86-64, if an entry ends on a 4k alignment and the next one starts > on a 4k alignment, could those be merged into one DMA segment that uses > two adjacent mapping entries?
Yes, it is now in the version I wrote last night, but not in the previous code that's in the tree.
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