TODO
. Where should we do eviction (detatch_pages())? We aren't necessarily
accessing the pages via a GART, so maybe we need some other threshold
to put a cap on the # of pages that can be pin'd.
. Use mm_shrinker to trigger unpinning pages.
. This is mainly theoretical since most of these devices don't actually
have swap or harddrive.
. GEM/shmem backed pages can have existing mappings (kernel linear map,
etc..), which isn't really ideal.
. Revisit GEM sync object infrastructure.. TTM has some framework for this
already. Possibly this could be refactored out and made more common?
There should be some way to do this with less wheel-reinvention.
. This can be handled by the dma-buf fence/reservation stuff when it
lands
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