[PATCH 10/20] drm/i915: Allocate scratch page from stolen

[Chris Wilson]

With the last direct CPU access to the scratch page removed, we can now
allocate it from our small amount of reserved system pages (stolen
memory).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 304d1222b321..8aa220b73699 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -665,7 +665,9 @@ int intel_init_pipe_control(struct intel_engine_cs *engine)
 
 	WARN_ON(engine->scratch.obj);
 
-	obj = i915_gem_object_create(engine->i915->dev, 4096);
+	obj = i915_gem_object_create_stolen(engine->i915->dev, 4096);
+	if (obj == NULL)
+		obj = i915_gem_object_create(engine->i915->dev, 4096);
 	if (IS_ERR(obj)) {
 		DRM_ERROR("Failed to allocate scratch page\n");
 		ret = PTR_ERR(obj);
-- 
2.8.1