The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 690e0ec8e63da9a29b39fedc6ed5da09c7c82651 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '167820536819200@xxxxxxxxx' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: 690e0ec8e63d ("drm/i915: Don't use stolen memory for ring buffers with LLC") 0d8ee5ba8db4 ("drm/i915: Don't back up pinned LMEM context images and rings during suspend") c56ce9565374 ("drm/i915 Implement LMEM backup and restore for suspend / resume") 0d9388635a22 ("drm/i915/ttm: Implement a function to copy the contents of two TTM-based objects") 48b096126954 ("drm/i915: Move __i915_gem_free_object to ttm_bo_destroy") d8ac30fd479c ("drm/i915/ttm: Reorganize the ttm move code somewhat") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 690e0ec8e63da9a29b39fedc6ed5da09c7c82651 Mon Sep 17 00:00:00 2001 From: John Harrison <John.C.Harrison@xxxxxxxxx> 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=UTF-8 Content-Transfer-Encoding: 8bit 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 <John.C.Harrison@xxxxxxxxx> Fixes: c58b735fc762 ("drm/i915: Allocate rings from stolen") Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx Cc: <stable@xxxxxxxxxxxxxxx> # v4.9+ Tested-by: Jouni Högander <jouni.hogander@xxxxxxxxx> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20230216011101.1909009-2-John.C.Harrison@xxxxxxxxx (cherry picked from commit f54c1f6c697c4297f7ed94283c184acc338a5cf8) Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c b/drivers/gpu/drm/i915/gt/intel_ring.c index 15ec64d881c4..fb1d2595392e 100644 --- a/drivers/gpu/drm/i915/gt/intel_ring.c +++ b/drivers/gpu/drm/i915/gt/intel_ring.c @@ -116,7 +116,7 @@ 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)) + if (IS_ERR(obj) && i915_ggtt_has_aperture(ggtt) && !HAS_LLC(i915)) obj = i915_gem_object_create_stolen(i915, size); if (IS_ERR(obj)) obj = i915_gem_object_create_internal(i915, size);
