[Intel-gfx] Patch "Revert "drm/i915: Don't use BAR mappings for ring buffers with LLC"" has been added to the 5.15-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    Revert "drm/i915: Don't use BAR mappings for ring buffers with LLC"

to the 5.15-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:
     revert-drm-i915-don-t-use-bar-mappings-for-ring-buffers-with-llc.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From b83855e90c4411bd06b4c201ea91ecec22f887ca Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Date: Sun, 12 Mar 2023 12:26:56 +0100
Subject: Revert "drm/i915: Don't use BAR mappings for ring buffers with LLC"

From: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

This reverts commit 4eb6789f9177a5fdb90e1b7cdd4b069d1fb9ce45 which is
commit 85636167e3206c3fbd52254fc432991cc4e90194 upstream.

It has been reported to cause problems on Alpine Linux and Manjaro Linux
5.15-based releases, so revert it for now until it can be sorted out.

Reported-by: "A.P. Jo." <apjo at tuta.io>
Link: https://lore.kernel.org/r/NQJqG8n--3-9@tuta.io
Link: https://gitlab.alpinelinux.org/alpine/aports/-/issues/14704
Reported-by: Philip Müller <philm at manjaro.org>
Link: https://lore.kernel.org/r/d955327b-cb1c-4646-76b9-b0499c0c64c6@manjaro.org
Link: https://gitlab.freedesktop.org/drm/intel/-/issues/8284
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: intel-gfx at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v4.9+
Cc: Jouni Högander <jouni.hogander at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/i915/gt/intel_ring.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/gt/intel_ring.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring.c
@@ -51,7 +51,7 @@ int intel_ring_pin(struct intel_ring *ri
 	if (unlikely(ret))
 		goto err_unpin;
 
-	if (i915_vma_is_map_and_fenceable(vma) && !HAS_LLC(vma->vm->i915)) {
+	if (i915_vma_is_map_and_fenceable(vma)) {
 		addr = (void __force *)i915_vma_pin_iomap(vma);
 	} else {
 		int type = i915_coherent_map_type(vma->vm->i915, vma->obj, false);
@@ -96,7 +96,7 @@ void intel_ring_unpin(struct intel_ring
 		return;
 
 	i915_vma_unset_ggtt_write(vma);
-	if (i915_vma_is_map_and_fenceable(vma) && !HAS_LLC(vma->vm->i915))
+	if (i915_vma_is_map_and_fenceable(vma))
 		i915_vma_unpin_iomap(vma);
 	else
 		i915_gem_object_unpin_map(vma->obj);


Patches currently in stable-queue which might be from gregkh at linuxfoundation.org are

queue-5.15/revert-drm-i915-don-t-use-bar-mappings-for-ring-buffers-with-llc.patch