From patchwork Fri Dec 22 14:19:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10130543 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A43E960318 for ; Fri, 22 Dec 2017 14:20:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 95B232942C for ; Fri, 22 Dec 2017 14:20:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 897E529E5B; Fri, 22 Dec 2017 14:20:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2942F29FE9 for ; Fri, 22 Dec 2017 14:20:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 675C46E742; Fri, 22 Dec 2017 14:20:17 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 052926E742 for ; Fri, 22 Dec 2017 14:20:15 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 10097785-1500050 for multiple; Fri, 22 Dec 2017 14:20:00 +0000 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Fri, 22 Dec 2017 14:19:59 +0000 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Fri, 22 Dec 2017 14:19:59 +0000 Message-Id: <20171222141959.3006-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.15.1 MIME-Version: 1.0 X-Originating-IP: 78.156.65.138 X-Country: code=GB country="United Kingdom" ip=78.156.65.138 Subject: [Intel-gfx] [PATCH] drm/i915: Assert that the request is on the execution queue before being removed X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP We should only attempt to remove requests from the execution queue that are on the execution queue. These are the requests that have been assigned a global_seqno, so we can assert that we only attempt to remove requests with a nonzero global_seqno. Afterwards we assert that we remove them in order, i.e. the global_seqno matches the engine's seqno, but that leaves a small loophole for an unattached request on an unused engine. We can then make the same assertion on queuing the request to the execution, it must have a zero global_seqno or else we are queuing the same request twice. Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Michał Winiarski Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/i915_gem_request.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 59f023bb7015..d575109f7a7f 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -479,6 +479,7 @@ void __i915_gem_request_submit(struct drm_i915_gem_request *request) /* Transfer from per-context onto the global per-engine timeline */ timeline = engine->timeline; GEM_BUG_ON(timeline == request->timeline); + GEM_BUG_ON(request->global_seqno); seqno = timeline_get_seqno(timeline); GEM_BUG_ON(!seqno); @@ -525,6 +526,7 @@ void __i915_gem_request_unsubmit(struct drm_i915_gem_request *request) /* Only unwind in reverse order, required so that the per-context list * is kept in seqno/ring order. */ + GEM_BUG_ON(!request->global_seqno); GEM_BUG_ON(request->global_seqno != engine->timeline->seqno); engine->timeline->seqno--;