From patchwork Tue Oct 21 10:54:14 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dheeraj Jamwal X-Patchwork-Id: 5120221 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 973309F349 for ; Tue, 21 Oct 2014 11:54:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D15B820121 for ; Tue, 21 Oct 2014 11:54:09 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 152B1200F4 for ; Tue, 21 Oct 2014 11:54:09 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id B0D241253; Tue, 21 Oct 2014 11:11:03 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 6CC5F1191 for ; Tue, 21 Oct 2014 11:11:02 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id B13F720213 for ; Tue, 21 Oct 2014 11:11:01 +0000 (UTC) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 21 Oct 2014 04:09:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,761,1406617200"; d="scan'208";a="617798240" Received: from ubuntu-desktop.png.intel.com ([10.221.122.25]) by fmsmga002.fm.intel.com with ESMTP; 21 Oct 2014 04:09:35 -0700 From: Dheeraj Jamwal To: ltsi-dev@lists.linuxfoundation.org Date: Tue, 21 Oct 2014 18:54:14 +0800 Message-Id: <1413889294-31328-655-git-send-email-dheerajx.s.jamwal@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> References: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Subject: [LTSI-dev] [PATCH 0654/1094] drm/i915: Make contexts non-snooped on non-LLC platforms X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ville Syrjälä We don't do CPU access to GPU contexts so making the GPU access snoop the CPU caches seems silly, and potentially expensive. v2: Use !IS_VALLEYVIEW instead of HAS_LLC as this is really about what the PTEs can represent. Add a comment clarifying the situation. Signed-off-by: Ville Syrjälä Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter (cherry picked from commit ad2ac08bf34b54c99026ebe50ea275b08b5b8ca2) Conflicts: drivers/gpu/drm/i915/i915_gem_context.c Signed-off-by: Dheeraj Jamwal --- drivers/gpu/drm/i915/i915_gem_context.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 45b81f8..2b25e57 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -239,8 +239,15 @@ __create_hw_context(struct drm_device *dev, ret = -ENOMEM; goto err_out; } - - if (INTEL_INFO(dev)->gen >= 7) { + /* + * Try to make the context utilize L3 as well as LLC. + * + * On VLV we don't have L3 controls in the PTEs so we + * shouldn't touch the cache level, especially as that + * would make the object snooped which might have a + * negative performance impact. + */ + if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev)) { ret = i915_gem_object_set_cache_level(ctx->obj, I915_CACHE_L3_LLC); /* Failure shouldn't ever happen this early */