From patchwork Tue Mar 7 17:03:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 13164574 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 56F4EC678D4 for ; Tue, 7 Mar 2023 18:43:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C894C10E119; Tue, 7 Mar 2023 18:43:46 +0000 (UTC) Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9E84C10E119 for ; Tue, 7 Mar 2023 18:43:45 +0000 (UTC) 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 sin.source.kernel.org (Postfix) with ESMTPS id 330BCCE1B42; Tue, 7 Mar 2023 18:43:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 041C5C4339B; Tue, 7 Mar 2023 18:43:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678214619; bh=kOz2Ku7XhOjq2b6BWWyE6jt3Eqg6VwTeGTTfFzpchiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zkrixZ+cDR4b9Gge+hyz/ZMU0+WsO9fBwmkIxGE9l6rEQv+IQs8MEEEcZzqcyVu/q +vVHkFM+EV+EZvqMJumymFJy842u2vczrQuOw7LPWSMfh+Hra0Z4bJyCq/XiIxzp+4 zxBKdriFnGZItl6LFMnUigvp9Hy24DooYI2/ZdVs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Date: Tue, 7 Mar 2023 18:03:35 +0100 Message-Id: <20230307170040.062243648@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170001.594919529@linuxfoundation.org> References: <20230307170001.594919529@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 6.1 881/885] drm/i915: Dont use stolen memory for ring buffers with LLC X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jani Nikula , Greg Kroah-Hartman , intel-gfx@lists.freedesktop.org, patches@lists.linux.dev, Chris Wilson , Rodrigo Vivi Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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: 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 @@ -116,7 +116,7 @@ static struct i915_vma *create_ring_vma( 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);