From b2241f182aa0942749e7c95eca92b840ab93263b Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 25 May 2017 08:25:28 +0100
Subject: [PATCH] drm/i915: Only GGTT vma may be pinned and prevent shrinking
Git-commit: b2241f182aa0942749e7c95eca92b840ab93263b
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_gem_shrinker.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- 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_i9
 {
 	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;
 }