From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA92CC77B60 for ; Mon, 20 Mar 2023 15:17:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232399AbjCTPRd (ORCPT ); Mon, 20 Mar 2023 11:17:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232113AbjCTPRM (ORCPT ); Mon, 20 Mar 2023 11:17:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90AA63433C for ; Mon, 20 Mar 2023 08:12:01 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 16A80615A7 for ; Mon, 20 Mar 2023 15:12:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7549C433A0; Mon, 20 Mar 2023 15:11:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679325119; bh=n8INzP9xrlxiMR2igTI6U9yfxcAygakj9Q9XUBxLdlI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RMRfzJYxZ6ZrILRR50haD4Vp0SoiZk51zcYrbtu06RF39ksKnE+vUGjXc4i3y2w/u Zng3QbF6ScW8yvLQ7IaZFcxkLVti4KKLm20wBZQ2iNqjVo+WfsS6vVBowDVcBTH4EC wcmuxm+O8OcELvu3okBaN02/8s+bJapde/of7wdw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, John Harrison , Chris Wilson , Joonas Lahtinen , Jani Nikula , Rodrigo Vivi , Tvrtko Ursulin , intel-gfx@lists.freedesktop.org, =?UTF-8?q?Jouni=20H=C3=B6gander?= , Daniele Ceraolo Spurio , Jani Nikula Subject: [PATCH 5.10 77/99] drm/i915: Dont use stolen memory for ring buffers with LLC Date: Mon, 20 Mar 2023 15:54:55 +0100 Message-Id: <20230320145446.626338296@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145443.333824603@linuxfoundation.org> References: <20230320145443.333824603@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: John Harrison 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: c58b735fc762 ("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_ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/gt/intel_ring.c +++ b/drivers/gpu/drm/i915/gt/intel_ring.c @@ -108,7 +108,7 @@ static struct i915_vma *create_ring_vma( struct i915_vma *vma; obj = ERR_PTR(-ENODEV); - if (i915_ggtt_has_aperture(ggtt)) + if (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);