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=-15.2 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_SANE_1 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 5176EC432BE for ; Thu, 26 Aug 2021 14:05:39 +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 190896054E for ; Thu, 26 Aug 2021 14:05:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 190896054E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 67ACC6E860; Thu, 26 Aug 2021 14:05:38 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 238796E860; Thu, 26 Aug 2021 14:05:37 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10087"; a="239945655" X-IronPort-AV: E=Sophos;i="5.84,353,1620716400"; d="scan'208";a="239945655" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2021 07:05:28 -0700 X-IronPort-AV: E=Sophos;i="5.84,353,1620716400"; d="scan'208";a="444567771" Received: from jons-linux-dev-box.fm.intel.com (HELO jons-linux-dev-box) ([10.1.27.20]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Aug 2021 07:05:27 -0700 Date: Thu, 26 Aug 2021 07:00:18 -0700 From: Matthew Brost To: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, daniele.ceraolospurio@intel.com Message-ID: <20210826140016.GA19362@jons-linux-dev-box> References: <20210826032327.18078-1-matthew.brost@intel.com> <20210826032327.18078-9-matthew.brost@intel.com> <2aa468eb-e7a8-1617-1b92-7a8f8b6ae015@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2aa468eb-e7a8-1617-1b92-7a8f8b6ae015@linux.intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) Subject: Re: [Intel-gfx] [PATCH 08/27] drm/i915/selftests: Add a cancel request selftest that triggers a reset 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Aug 26, 2021 at 10:32:54AM +0100, Tvrtko Ursulin wrote: > > On 26/08/2021 04:23, Matthew Brost wrote: > > Add a cancel request selftest that results in an engine reset to cancel > > the request as it is non-preemptable. Also insert a NOP request after > > the cancelled request and confirm that it completely successfully. > > Which patch fixes a problem this exposes in the execlists implementation? > https://patchwork.freedesktop.org/patch/451421/?series=93704&rev=6 > > Signed-off-by: Matthew Brost > > --- > > drivers/gpu/drm/i915/selftests/i915_request.c | 100 ++++++++++++++++++ > > 1 file changed, 100 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c > > index d67710d10615..e2c5db77f087 100644 > > --- a/drivers/gpu/drm/i915/selftests/i915_request.c > > +++ b/drivers/gpu/drm/i915/selftests/i915_request.c > > @@ -772,6 +772,98 @@ static int __cancel_completed(struct intel_engine_cs *engine) > > return err; > > } > > +static int __cancel_reset(struct intel_engine_cs *engine) > > +{ > > + struct intel_context *ce; > > + struct igt_spinner spin; > > + struct i915_request *rq, *nop; > > + unsigned long preempt_timeout_ms; > > + int err = 0; > > + > > You may need to skip the test if preempt timeout is compiled out or if GPU > reset is altogether disabled. > Yes, probably. Will fix this. > > + preempt_timeout_ms = engine->props.preempt_timeout_ms; > > + engine->props.preempt_timeout_ms = 100; > > + > > + if (igt_spinner_init(&spin, engine->gt)) > > + goto out_restore; > > + > > + ce = intel_context_create(engine); > > + if (IS_ERR(ce)) { > > + err = PTR_ERR(ce); > > + goto out_spin; > > + } > > + > > + rq = igt_spinner_create_request(&spin, ce, MI_NOOP); > > + if (IS_ERR(rq)) { > > + err = PTR_ERR(rq); > > + goto out_ce; > > + } > > + > > + pr_debug("%s: Cancelling active request\n", engine->name); > > "active non-preemptable" perhaps? > Sure. > > + i915_request_get(rq); > > + i915_request_add(rq); > > + if (!igt_wait_for_spinner(&spin, rq)) { > > + struct drm_printer p = drm_info_printer(engine->i915->drm.dev); > > + > > + pr_err("Failed to start spinner on %s\n", engine->name); > > + intel_engine_dump(engine, &p, "%s\n", engine->name); > > + err = -ETIME; > > + goto out_rq; > > + } > > + > > + nop = intel_context_create_request(ce); > > + if (IS_ERR(nop)) > > + goto out_nop; > > + i915_request_get(nop); > > + i915_request_add(nop); > > + > > + i915_request_cancel(rq, -EINTR); > > + > > + if (i915_request_wait(rq, 0, HZ) < 0) { > > + struct drm_printer p = drm_info_printer(engine->i915->drm.dev); > > + > > + pr_err("%s: Failed to cancel hung request\n", engine->name); > > + intel_engine_dump(engine, &p, "%s\n", engine->name); > > + err = -ETIME; > > + goto out_nop; > > + } > > + > > + if (rq->fence.error != -EINTR) { > > + pr_err("%s: fence not cancelled (%u)\n", > > + engine->name, rq->fence.error); > > + err = -EINVAL; > > + goto out_nop; > > + } > > + > > + if (i915_request_wait(nop, 0, HZ) < 0) { > > + struct drm_printer p = drm_info_printer(engine->i915->drm.dev); > > + > > + pr_err("%s: Failed to complete nop request\n", engine->name); > > + intel_engine_dump(engine, &p, "%s\n", engine->name); > > + err = -ETIME; > > + goto out_nop; > > + } > > + > > + if (nop->fence.error != 0) { > > + pr_err("%s: Nop request errored (%u)\n", > > Maybe s/nop/innocent/ in the respective log messages? > I kinda perfer NOP. > > + engine->name, nop->fence.error); > > + err = -EINVAL; > > + } > > + > > +out_nop: > > + i915_request_put(nop); > > +out_rq: > > + i915_request_put(rq); > > +out_ce: > > + intel_context_put(ce); > > +out_spin: > > + igt_spinner_fini(&spin); > > +out_restore: > > + engine->props.preempt_timeout_ms = preempt_timeout_ms; > > + if (err) > > + pr_err("%s: %s error %d\n", __func__, engine->name, err); > > + return err; > > +} > > + > > static int live_cancel_request(void *arg) > > { > > struct drm_i915_private *i915 = arg; > > @@ -804,6 +896,14 @@ static int live_cancel_request(void *arg) > > return err; > > if (err2) > > return err2; > > + > > + /* Expects reset so call outside of igt_live_test_* */ > > Hm there are live tests like live_preempt_cancel which seemingly manage to > do resets under the live test block. > You can increment t->reset_global if a GT reset is expected, problem is only execlists do a GT while GuC submission does a GuC engine based reset so we'd have to put in a statement like this if was within the begin / end block: if !guc t->reset_global++ I'd just rather leave it as is rather than baking in execlists / guc backend specific knowledge into the test. Matt > Regards, > > Tvrtko > > > + err = __cancel_reset(engine); > > + if (err) > > + return err; > > + > > + if (igt_flush_test(i915)) > > + return -EIO; > > } > > return 0; > >