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 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 B3A7BC6FD1D for ; Mon, 20 Mar 2023 13:38:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 49A1810E13D; Mon, 20 Mar 2023 13:38:37 +0000 (UTC) Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 55FBC10E13D for ; Mon, 20 Mar 2023 13:38:35 +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 ams.source.kernel.org (Postfix) with ESMTPS id D4F9BB80E7B; Mon, 20 Mar 2023 13:38:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B0D5C433D2; Mon, 20 Mar 2023 13:38:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679319512; bh=1LMROTWK6rorNN7UmXELCMNnHV5+vWk/UXi5KhP7idI=; h=Subject:To:Cc:From:Date:From; b=dYiVKUzGfYVOd6gl6XNGAHf/bwXUROKMmct3Ob7nCDV865Mlw4AxiNVoh09j1OxfP fU4toUpTPmp0ZU/ODGIgHrKfj/udZgljUEoRNeq3EVlN4vUSYpVLrnnKgFQ47lwbB+ mxSYBLApRbyUOyXd+IQFfDWbkxwTYdoUKPU6Y1EE= To: John.C.Harrison@Intel.com, chris@chris-wilson.co.uk, daniele.ceraolospurio@intel.com, gregkh@linuxfoundation.org, intel-gfx@lists.freedesktop.org, jani.nikula@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, jouni.hogander@intel.com, rodrigo.vivi@intel.com, tvrtko.ursulin@linux.intel.com From: Date: Mon, 20 Mar 2023 14:38:21 +0100 Message-ID: <1679319501174162@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore Subject: [Intel-gfx] Patch "drm/i915: Don't use stolen memory for ring buffers with LLC" has been added to the 5.15-stable tree 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: stable-commits@vger.kernel.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This is a note to let you know that I've just added the patch titled drm/i915: Don't use stolen memory 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: drm-i915-don-t-use-stolen-memory-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 know about it. >From 690e0ec8e63da9a29b39fedc6ed5da09c7c82651 Mon Sep 17 00:00:00 2001 From: John Harrison Date: Wed, 15 Feb 2023 17:11:00 -0800 Subject: drm/i915: Don't use stolen memory for ring buffers with LLC MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 @@ -113,7 +113,7 @@ static struct i915_vma *create_ring_vma( struct i915_vma *vma; obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_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); Patches currently in stable-queue which might be from John.C.Harrison@Intel.com are queue-5.15/drm-i915-don-t-use-stolen-memory-for-ring-buffers-with-llc.patch