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 X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4EE47C433E0 for ; Wed, 23 Dec 2020 11:12:21 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 0A07B222F9 for ; Wed, 23 Dec 2020 11:12:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A07B222F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=chris-wilson.co.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 181016E916; Wed, 23 Dec 2020 11:12:14 +0000 (UTC) Received: from fireflyinternet.com (unknown [77.68.26.236]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8E0F36E908 for ; Wed, 23 Dec 2020 11:11:48 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from build.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 23412192-1500050 for multiple; Wed, 23 Dec 2020 11:11:30 +0000 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Wed, 23 Dec 2020 11:10:40 +0000 Message-Id: <20201223111126.3338-16-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201223111126.3338-1-chris@chris-wilson.co.uk> References: <20201223111126.3338-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 16/62] drm/i915: Reduce test_and_set_bit to set_bit in i915_request_submit() 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: Chris Wilson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Avoid the full blown memory barrier of test_and_set_bit() by noting the completed request and removing it from the lists. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_request.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index b5de7cf8585b..2ed8cb0d248f 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -539,8 +539,10 @@ bool __i915_request_submit(struct i915_request *request) * dropped upon retiring. (Otherwise if resubmit a *retired* * request, this would be a horrible use-after-free.) */ - if (i915_request_completed(request)) - goto xfer; + if (i915_request_completed(request)) { + list_del_init(&request->sched.link); + goto active; + } if (unlikely(intel_context_is_closed(request->context) && !intel_engine_has_heartbeat(engine))) @@ -579,11 +581,11 @@ bool __i915_request_submit(struct i915_request *request) engine->serial++; result = true; -xfer: - if (!test_and_set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)) { - list_move_tail(&request->sched.link, &engine->active.requests); - clear_bit(I915_FENCE_FLAG_PQUEUE, &request->fence.flags); - } + GEM_BUG_ON(test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)); + list_move_tail(&request->sched.link, &engine->active.requests); +active: + clear_bit(I915_FENCE_FLAG_PQUEUE, &request->fence.flags); + set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags); /* * XXX Rollback bonded-execution on __i915_request_unsubmit()? -- 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx