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RFC: Context (or LRC as I call them) W/A

Matthew Brost requested to merge mbrost/xe-kernel-driver-rebase:lrc_wa into xe

Initial draft of LRC W/A.

Driver loads with these patches but xe_exec_basic.twice-rebind fails with IOMMU CAT error on TGL. Will look into that.

Layering is broken in patch #1 (closed) as the UC layer reaches back up into the GT layer but I figure we clean all of this up when we refactor the driver load ordering for SRIOV.

Looking for early feedback.

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