drm/i915: Assert we do not try to expand VMA for hugepage inside GGTT
We only apply the hugepage PD redirection inside the ppGTT, so during i915_vma_insert() we want to exclude the GGTT from the additional alignment constraints (thereby avoiding the extra GTT pressure from fragmentation). Add an assert to document that intention alongside the comment. v2: After discussion with Matthew, make it a blanket GGTT ban (previously we allowed the expansion for appgtt, and so indirectly ggtt). There are issues we need to fix before allowing the current appgtt to be used with hugepages, and if we do, we probably want more care over when to expand/align, as the mappable aperture inside the ggtt is precious. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: NMatthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171009092019.20747-1-chris@chris-wilson.co.ukReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
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