drm/i915/gtt: Make gen6 page directories evictable
Currently all page directories are bound at creation using an unevictable node in the GGTT. This severely limits us as we cannot remove any inactive ppgtt for new contexts, or under aperture pressure. To fix this we need to make the page directory into a first class and unbindable vma. Hence, the creation of a custom vma to wrap the page directory as opposed to a GEM object. In this patch, we leave the page directories pinned upon creation. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> Reviewed-by:
Matthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180612120446.13901-1-chris@chris-wilson.co.uk
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