Jens Axboe wrote:
On Tue, Mar 21 2006, Mark Lord wrote:
Jens Axboe wrote:
..
It would be much nicer if the iommu actually had some more knowledge,
ideally the same requirements that the block layer is faced with. No
driver should have to check the mapped sg list.
Yup. Absolutely. So long as they continue to never *add* new sg entries
(only doing merges instead), then I believe they just need to know the
device's .dma_boundary parameter. We could pass this to them as an extra
parameters, or perhaps embed it into the sg_list data structure somehow.
You want max size as well, so boundary and max size should be enough.
Oh, now there's a thought. How do we specify "max segment size" today?
I'll need to make sure that sata_mv still does that (64KB), even though
it doesn't care about crossing 64KB boundaries.
Thanks
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