From 2a51cf3ad34f6a177b03d44797b5e325016701a6 Mon Sep 17 00:00:00 2001 From: John Harrison Date: Wed, 15 Feb 2023 17:11:00 -0800 Subject: [PATCH] drm/i915: Don't use stolen memory for ring buffers with LLC MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 690e0ec8e63da9a29b39fedc6ed5da09c7c82651 upstream. Direction from hardware is that stolen memory should never be used for ring buffer allocations on platforms with LLC. 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 Fixes: c2b86cf5b66b ("drm/i915: Allocate rings from stolen") Cc: Chris Wilson Cc: Joonas Lahtinen Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: # v4.9+ Tested-by: Jouni Högander Reviewed-by: Daniele Ceraolo Spurio Link: https://patchwork.freedesktop.org/patch/msgid/20230216011101.1909009-2-John.C.Harrison@Intel.com (cherry picked from commit f54c1f6c697c4297f7ed94283c184acc338a5cf8) Signed-off-by: Jani Nikula Signed-off-by: John Harrison Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/gt/intel_ringbuffer.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c index 808269b2108fb..125f7bb67bee9 100644 --- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c @@ -1268,10 +1268,11 @@ static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size) { struct i915_address_space *vm = &ggtt->vm; struct drm_i915_private *i915 = vm->i915; - struct drm_i915_gem_object *obj; + struct drm_i915_gem_object *obj = NULL; struct i915_vma *vma; - obj = i915_gem_object_create_stolen(i915, size); + if (!HAS_LLC(i915)) + obj = i915_gem_object_create_stolen(i915, size); if (!obj) obj = i915_gem_object_create_internal(i915, size); if (IS_ERR(obj)) -- 2.39.5