From patchwork Thu Feb 16 00:22:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13142331 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 E9E55C636D4 for ; Thu, 16 Feb 2023 00:23:53 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 867C610E00D; Thu, 16 Feb 2023 00:23:47 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0FFB810E004; Thu, 16 Feb 2023 00:23:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676507026; x=1708043026; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=hcqphykPgmz5B64oP0cvmOuWT6Hc5on6T8eg3FKcsro=; b=ZgJWgsEm8hcjCDKB1SBYbrm/s75FC9eTA5MsNDTJW+0GfreL308+tULt aJ+bWbrU/JzvF+2HWPZ3lyEMUhm6u7QQ0Hny7h4ABBhlTO+zoH7sHe74B 7dUguzulGraY6F+UsGDN3Qg3gAhNeXP874gP7AGXf1oKMBc5qU2tnwd8R JosgIFfmfdTleG75W318pc8NNPVF7cWE/7M/yO4t7mGZKmVzVnRxYt+yx mtB0YZ2WCYmZBoreW5l5uvsLmFBpF2qijF7cqgdinc3JkA74LJeoZAp3s eQz1IYYjGxVsgMo7cm1rcEetXCXQn+SQbcBp148CvuXTBMuERv8/4U1h9 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="311945698" X-IronPort-AV: E=Sophos;i="5.97,301,1669104000"; d="scan'208";a="311945698" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 16:23:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="843928659" X-IronPort-AV: E=Sophos;i="5.97,301,1669104000"; d="scan'208";a="843928659" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by orsmga005.jf.intel.com with ESMTP; 15 Feb 2023 16:23:32 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Subject: [PATCH v2 1/2] drm/i915: Don't use stolen memory for ring buffers with LLC Date: Wed, 15 Feb 2023 16:22:47 -0800 Message-Id: <20230216002248.1851966-2-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230216002248.1851966-1-John.C.Harrison@Intel.com> References: <20230216002248.1851966-1-John.C.Harrison@Intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tvrtko Ursulin , intel-gfx@lists.freedesktop.org, Chris Wilson , DRI-Devel@Lists.FreeDesktop.Org, Rodrigo Vivi , stable@vger.kernel.org, John Harrison Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: John Harrison 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+ --- drivers/gpu/drm/i915/gt/intel_ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_ring.c b/drivers/gpu/drm/i915/gt/intel_ring.c index 15ec64d881c44..fb1d2595392ed 100644 --- 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(struct i915_ggtt *ggtt, int size) 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);