Messages in this thread | | | Date | Mon, 7 Jan 2008 15:57:56 -0600 | From | Olof Johansson <> | Subject | Re: [PATCH][POWERPC] Workaround for iommu page alignment |
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On Tue, Jan 08, 2008 at 08:45:59AM +1100, Benjamin Herrenschmidt wrote: > Our iommu page size is currently always 4K. That means with our current > code, drivers may do a dma_map_sg() of a 64K page and obtain a dma_addr_t > that is only 4K aligned. > > This works fine in most cases except some infiniband HW it seems, where > they tell the HW about the page size and it ignores the low bits of the > DMA address. > > This works around it by making our IOMMU code enforce a PAGE_SIZE alignment > for mappings of objects that are page aligned in the first place and whose > size is larger or equal to a page. > > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
-Olof
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