On Fri, 2008-07-04 at 21:05 +0200, [EMAIL PROTECTED] wrote: > Introduce a new dma attriblue DMA_ATTR_STRONG_ORDERING to use strong ordering > on DMA mappings in the Cell processor. Add the code to the Cell's IOMMU > implementation to use this. > > The current Cell IOMMU implementation sets the IOPTE_SO_RW bits in all IOTPEs > (for both the dynamic and fixed mappings) which enforces strong ordering of > both reads and writes. This patch makes the default behaviour weak ordering > (the IOPTE_SO_RW bits not set) and to request a strongly ordered mapping the > new DMA_ATTR_STRONG_ORDERING needs to be used.
We're sure that's safe? cheers -- Michael Ellerman OzLabs, IBM Australia Development Lab wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person
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