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.
Jeff
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