cxl/region: Split commit_store() into __commit() and queue_reset() helpers

The complexity of dropping the lock is removed in favor of splitting commit
operations to a helper, and leaving all the complexities of "decommit" for
commit_store() to coordinate the different locking contexts.

The CPU cache-invalidation in the decommit path is solely handled now by
cxl_region_decode_reset(). Previously the CPU caches were being needlessly
flushed twice in the decommit path where the first flush had no guarantee
that the memory would not be immediately re-dirtied.

Cc: Davidlohr Bueso <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Dave Jiang <[email protected]>
Cc: Alison Schofield <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Ira Weiny <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Reviewed-by: Fabio M. De Francesco <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

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