Fw:[patch 2/2] backport of sba sg list management to ccio-dma

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And here is the main hunk:

This consist of 'backporting' to ccio of the most of Grant's work on sg l=
ist
management of sba-iommu.

According to some stress test on d380 it makes ncr driver more stable; im=
prove
network perf on my d380 (from 110 to 430 kb/s);
(would allow in a next step merge some hunk of sba code in iommu-helper.h=
)

Tia,
    J.
---
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