drm/i915: Report correct GGTT space usage

Currently only normal views were accounted which under-accounts
the usage as reported in debugfs.

Introduce new helper, i915_gem_obj_total_ggtt_size, and use it
from call sites which want to know how much GGTT space are
objects using.

v2: Single loop in i915_gem_get_aperture_ioctl. (Chris Wilson)

v3: Walk GGTT active/inactive lists in i915_gem_get_aperture_ioctl
    for better efficiency. (Chris Wilson, Daniel Vetter)

v4: Make i915_gem_obj_total_ggtt_size private to debugfs. (Chris Wilson)

v5: Change unsigned long to u64. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 37cd901..c8ee13f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -149,14 +149,18 @@
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_get_aperture *args = data;
-	struct drm_i915_gem_object *obj;
+	struct i915_gtt *ggtt = &dev_priv->gtt;
+	struct i915_vma *vma;
 	size_t pinned;
 
 	pinned = 0;
 	mutex_lock(&dev->struct_mutex);
-	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
-		if (i915_gem_obj_is_pinned(obj))
-			pinned += i915_gem_obj_ggtt_size(obj);
+	list_for_each_entry(vma, &ggtt->base.active_list, mm_list)
+		if (vma->pin_count)
+			pinned += vma->node.size;
+	list_for_each_entry(vma, &ggtt->base.inactive_list, mm_list)
+		if (vma->pin_count)
+			pinned += vma->node.size;
 	mutex_unlock(&dev->struct_mutex);
 
 	args->aper_size = dev_priv->gtt.base.total;
@@ -5468,4 +5472,3 @@
 
 	return false;
 }
-