From patchwork Wed May 16 15:12:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10404151 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 8F3E5602C2 for ; Wed, 16 May 2018 15:13:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7CDFE28329 for ; Wed, 16 May 2018 15:13:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7009328332; Wed, 16 May 2018 15:13:35 +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=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 2246D28329 for ; Wed, 16 May 2018 15:13:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9FECA6E488; Wed, 16 May 2018 15:13:34 +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 11FDE6E461 for ; Wed, 16 May 2018 15:13:22 +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 11725139-1500050 for multiple; Wed, 16 May 2018 16:13:09 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Wed, 16 May 2018 16:13:11 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Wed, 16 May 2018 16:12:58 +0100 Message-Id: <20180516151259.15252-6-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180516151259.15252-1-chris@chris-wilson.co.uk> References: <20180516151259.15252-1-chris@chris-wilson.co.uk> 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 6/7] drm/i915/execlists: Flush pending preemption events during reset X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 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 Catch up with the inflight CSB events, after disabling the tasklet before deciding which request was truly guilty of hanging the GPU. Signed-off-by: Chris Wilson Cc: Michał Winiarski CC: Michel Thierry Cc: Jeff McGee Cc: Tvrtko Ursulin Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/intel_lrc.c | 36 +++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index e70d8d624899..3b889bb4352a 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1843,6 +1843,7 @@ static struct i915_request * execlists_reset_prepare(struct intel_engine_cs *engine) { struct intel_engine_execlists * const execlists = &engine->execlists; + struct i915_request *request, *active; GEM_TRACE("%s\n", engine->name); @@ -1857,7 +1858,40 @@ execlists_reset_prepare(struct intel_engine_cs *engine) */ __tasklet_disable_sync_once(&execlists->tasklet); - return i915_gem_find_active_request(engine); + /* + * We want to flush the pending context switches, having disabled + * the tasklet above, we can assume exclusive access to the execlists. + * For this allows us to catch up with an inflight preemption event, + * and avoid blaming an innocent request if the stall was due to the + * preemption itself. + */ + if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted)) + process_csb(engine); + + /* + * The last active request can then be no later than the last request + * now in ELSP[0]. So search backwards from there, so that if the GPU + * has advanced beyond the last CSB update, it will be pardoned. + */ + active = NULL; + request = port_request(execlists->port); + if (request) { + unsigned long flags; + + spin_lock_irqsave(&engine->timeline.lock, flags); + list_for_each_entry_from_reverse(request, + &engine->timeline.requests, + link) { + if (__i915_request_completed(request, + request->global_seqno)) + break; + + active = request; + } + spin_unlock_irqrestore(&engine->timeline.lock, flags); + } + + return active; } static void execlists_reset(struct intel_engine_cs *engine,