From patchwork Mon Mar 6 11:15:28 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 9605697 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 B3BBD601D2 for ; Mon, 6 Mar 2017 11:15:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8170527F4B for ; Mon, 6 Mar 2017 11:15:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7578028305; Mon, 6 Mar 2017 11:15:37 +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 1BF6027F4B for ; Mon, 6 Mar 2017 11:15:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D9DAF6E14A; Mon, 6 Mar 2017 11:15:34 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 050126E14A; Mon, 6 Mar 2017 11:15:32 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from nuc-i3427.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 5736405-1500050 for multiple; Mon, 06 Mar 2017 11:15:26 +0000 Received: by nuc-i3427.alporthouse.com (sSMTP sendmail emulation); Mon, 06 Mar 2017 11:15:28 +0000 Date: Mon, 6 Mar 2017 11:15:28 +0000 From: Chris Wilson To: Pavel Machek Subject: Re: [regression] Re: 4.11-rc0, thinkpad x220: GPU hang Message-ID: <20170306111528.GR5997@nuc-i3427.alporthouse.com> Mail-Followup-To: Chris Wilson , Pavel Machek , kernel list , daniel.vetter@intel.com, jani.nikula@linux.intel.com, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org References: <20170228143453.GA11914@amd> <20170228150222.GU10304@nuc-i3427.alporthouse.com> <20170305230150.GA15063@amd> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20170305230150.GA15063@amd> User-Agent: Mutt/1.5.21 (2010-09-15) Cc: dri-devel@lists.freedesktop.org, daniel.vetter@intel.com, intel-gfx@lists.freedesktop.org, kernel list X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP On Mon, Mar 06, 2017 at 12:01:51AM +0100, Pavel Machek wrote: > Hi! > > > > mplayer stopped working after a while. Dmesg says: > > > > > > [ 3000.266533] cdc_ether 2-1.2:1.0 usb0: register 'cdc_ether' at > > Now I'm pretty sure it is a regression in v4.11-rc0. Any ideas what to > try? Bisect will be slow and nasty :-(. I came the conclusion that #99671 is the ring HEAD overtaking the TAIL, and under the presumption that your bug matches (as the symptoms do): diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 4ffa35faff49..62e31a7438ac 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -782,10 +782,10 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request) { struct drm_i915_private *dev_priv = request->i915; - i915_gem_request_submit(request); - GEM_BUG_ON(!IS_ALIGNED(request->tail, 8)); I915_WRITE_TAIL(request->engine, request->tail); + + i915_gem_request_submit(request); } static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)