drm/i915: Refactor object page API
The plan is to make obtaining the backing storage for the object avoid struct_mutex (i.e. use its own locking). The first step is to update the API so that normal users only call pin/unpin whilst working on the backing storage. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-12-chris@chris-wilson.co.uk
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