Conrad Meyer 6ca07079af ioat(4): Add support for 'fence' bit with DMA_FENCE flag
Some classes of IOAT hardware prefetch reads.  DMA operations that
depend on the result of prior DMA operations must use the DMA_FENCE flag
to prevent stale reads.

(E.g., I've hit this personally on Broadwell-EP.  The Broadwell-DE has a
different IOAT unit that is documented to not pipeline DMA operations.)

Sponsored by:	EMC / Isilon Storage Division
2016-01-15 01:34:43 +00:00
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