[Intel-gfx] [PATCH] drm/i915: Don't use stolen memory for ring buffers

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Direction from hardware is that stolen memory should never be used for
ring buffer allocations. There are too many caching pitfalls due to the
way stolen memory accesses are routed. So it is safest to just not use
it.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/gt/intel_ring.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c b/drivers/gpu/drm/i915/gt/intel_ring.c
index 15ec64d881c44..d1a47e1ae6452 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring.c
@@ -116,8 +116,6 @@ static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
 
 	obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_VOLATILE |
 					  I915_BO_ALLOC_PM_VOLATILE);
-	if (IS_ERR(obj) && i915_ggtt_has_aperture(ggtt))
-		obj = i915_gem_object_create_stolen(i915, size);
 	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
 	if (IS_ERR(obj))
-- 
2.39.1