Tejun Heo wrote:
Mark Lord wrote:
Another one for those beers, is a way to tell the IOMMU code about
physical segment limitations -- so we can stop having to allocate
PRD tables 2X as big as necessary in drivers like sata_mv.

Hmmm... What's the restriction for sata_mv?  The same as BMDMA?  We need
to update the block layer too to get the BMDMA right.

Same as for BMDMA, specifically: after block/etc. merging is done, and things are passed to the IOMMU via dma_map_sg(), the IOMMU may merge -too- aggressively, merging across boundaries (like 64k bmdma boundary) because it is unaware of such restrictions.


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