From 5c2abbeab798154166d42fce4f71790caa6dd9bc Mon Sep 17 00:00:00 2001
From: Ben Widawsky <benjamin.widawsky@intel.com>
Date: Tue, 24 Sep 2013 09:57:57 -0700
Subject: [PATCH] drm/i915: Provide a cheap ggtt vma lookup

"We do fairly often lookup the ggtt vma for an obj." - Chris Wilson. As
such, provide a function to offer slightly cheaper access to the vma.
Not performance tested. By my quick estimation it saves at least 3
pointer dereferences from the existing mechanism.

This patch mostly matches code from Chris in
<20130911221430.GB7825@nuc-i3427.alporthouse.com>

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Reading git-format-patch failed