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[Launchpad Bug Tracker <1592443@xxxxxxxxxxxxxxxxxx>]

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This adds an afu_driver_ops structure with deliver_event callback. An
AFU driver such as cxlflash can fill this out and associate it with a
context to enable passing custom AFU specific events to userspace.

This also adds a new kernel API function cxl_context_pending_events(),
that the AFU driver can use to notify the cxl driver that new specific
events are ready to be delivered, and wake up anyone waiting on the
context wait queue.

The current count of AFU driver specific events is stored in the field
afu_driver_events of the context structure.

The cxl driver will check the afu_driver_events count during poll,
select, read, etc. calls to check if an AFU driver specific event is
pending, and will call deliver_event() to deliver that event. This way,
the cxl driver takes care of all the usual locking semantics around
these calls and handles all the generic cxl events, so that the AFU
driver only needs to worry about it's own events.

This is a kernel feature for Ubuntu 16.10

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-133692 severity-medium targetmilestone-inin1610
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[Ubuntu 16.10] CAPI flash (cxlflash) driver and CXL kernel services to support driver event notification
https://bugs.launchpad.net/bugs/1592443
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