This is a note to let you know that I've just added the patch titled
drm/i915: Don't use BAR mappings for ring buffers with LLC
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-don-t-use-bar-mappings-for-ring-buffers-with-llc.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85636167e3206c3fbd52254fc432991cc4e90194 Mon Sep 17 00:00:00 2001
From: John Harrison <John.C.Harrison@xxxxxxxxx>
Date: Wed, 15 Feb 2023 17:11:01 -0800
Subject: drm/i915: Don't use BAR mappings for ring buffers with LLC
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From: John Harrison <John.C.Harrison@xxxxxxxxx>
commit 85636167e3206c3fbd52254fc432991cc4e90194 upstream.
Direction from hardware is that ring buffers should never be mapped
via the BAR on systems with LLC. There are too many caching pitfalls
due to the way BAR accesses are routed. So it is safest to just not
use it.
Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
Fixes: 9d80841ea4c9 ("drm/i915: Allow ringbuffers to be bound anywhere")
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/20230216011101.1909009-3-John.C.Harrison@xxxxxxxxx
(cherry picked from commit 65c08339db1ada87afd6cfe7db8e60bb4851d919)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1083,7 +1083,7 @@ int intel_ring_pin(struct intel_ring *ri
if (unlikely(ret))
return ret;
- if (i915_vma_is_map_and_fenceable(vma))
+ if (i915_vma_is_map_and_fenceable(vma) && !HAS_LLC(vma->vm->i915))
addr = (void __force *)i915_vma_pin_iomap(vma);
else
addr = i915_gem_object_pin_map(vma->obj, map);
@@ -1118,7 +1118,7 @@ void intel_ring_unpin(struct intel_ring
/* Discard any unused bytes beyond that submitted to hw. */
intel_ring_reset(ring, ring->tail);
- if (i915_vma_is_map_and_fenceable(ring->vma))
+ if (i915_vma_is_map_and_fenceable(ring->vma) && !HAS_LLC(ring->vma->vm->i915))
i915_vma_unpin_iomap(ring->vma);
else
i915_gem_object_unpin_map(ring->vma->obj);
Patches currently in stable-queue which might be from John.C.Harrison@xxxxxxxxx are
queue-4.19/drm-i915-don-t-use-bar-mappings-for-ring-buffers-with-llc.patch
