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 5B631C76195 for ; Mon, 20 Mar 2023 15:01:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231959AbjCTPB4 (ORCPT ); Mon, 20 Mar 2023 11:01:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48778 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232000AbjCTPB0 (ORCPT ); Mon, 20 Mar 2023 11:01:26 -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 BD4142BF29 for ; Mon, 20 Mar 2023 07:58:07 -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 82D5B6157C for ; Mon, 20 Mar 2023 14:57:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B586C4339B; Mon, 20 Mar 2023 14:57:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679324271; bh=Cf59l1IgW7fja5Gr2YvK74jHZ3rqehXnTdjiyxwmEVA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kilNxVrD/uqgqizw6NHrRzGE2EtGlDbv1egOVtDAARUbAsAEL/ZMTWXeYH7LYXFkj Rio3L3gpg/2rt9viaff+jxLaMNFoQA5SOAuX+TO4dwj19aPbihyZJGsgvNgFXLzUxq PgGvugoDXDIi50TnS0JOv3Um6XCivKF9irerXqYg= 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 4.14 27/30] drm/i915: Dont use stolen memory for ring buffers with LLC Date: Mon, 20 Mar 2023 15:54:51 +0100 Message-Id: <20230320145421.261418118@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145420.204894191@linuxfoundation.org> References: <20230320145420.204894191@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/intel_ringbuffer.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1359,10 +1359,11 @@ static struct i915_vma * intel_ring_create_vma(struct drm_i915_private *dev_priv, int size) { struct i915_address_space *vm = &dev_priv->ggtt.base; - struct drm_i915_gem_object *obj; + struct drm_i915_gem_object *obj = NULL; struct i915_vma *vma; - obj = i915_gem_object_create_stolen(dev_priv, size); + if (!HAS_LLC(dev_priv)) + obj = i915_gem_object_create_stolen(dev_priv, size); if (!obj) obj = i915_gem_object_create_internal(dev_priv, size); if (IS_ERR(obj))