drm/i915: Only GGTT vma may be pinned and prevent shrinking

As only GGTT vma may be permanently pinned and are always at the head of
the object's vma list, as soon as we seen a ppGTT vma we can stop
searching for any_vma_pinned().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170525072528.11185-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index b409e67..0fd2b58 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -65,9 +65,17 @@ static bool any_vma_pinned(struct drm_i915_gem_object *obj)
 {
        struct i915_vma *vma;
 
-       list_for_each_entry(vma, &obj->vma_list, obj_link)
+       list_for_each_entry(vma, &obj->vma_list, obj_link) {
+               /* Only GGTT vma may be permanently pinned, and are always
+                * at the start of the list. We can stop hunting as soon
+                * as we see a ppGTT vma.
+                */
+               if (!i915_vma_is_ggtt(vma))
+                       break;
+
                if (i915_vma_is_pinned(vma))
                        return true;
+       }
 
        return false;
 }