From patchwork Mon Oct 21 14:13:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 11202285 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 78C991515 for ; Mon, 21 Oct 2019 14:13:19 +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 60F162070B for ; Mon, 21 Oct 2019 14:13:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 60F162070B 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 5BF1A6E113; Mon, 21 Oct 2019 14:13:18 +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 4DA496E115 for ; Mon, 21 Oct 2019 14:13:17 +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 18913761-1500050 for ; Mon, 21 Oct 2019 15:13:14 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Mon, 21 Oct 2019 15:13:13 +0100 Message-Id: <20191021141313.19664-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.24.0.rc0 MIME-Version: 1.0 Subject: [Intel-gfx] [CI] drm/i915/gt: Introduce barrier pulses along engines 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" To flush idle barriers, and even inflight requests, we want to send a preemptive 'pulse' along an engine. We use a no-op request along the pinned kernel_context at high priority so that it should run or else kick off the stuck requests. We can use this to ensure idle barriers are immediately flushed, as part of a context cancellation mechanism, or as part of a heartbeat mechanism to detect and reset a stuck GPU. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/Makefile | 3 +- .../gpu/drm/i915/gt/intel_engine_heartbeat.c | 77 ++++++++++++ .../gpu/drm/i915/gt/intel_engine_heartbeat.h | 15 +++ drivers/gpu/drm/i915/gt/intel_engine_pm.c | 2 +- .../drm/i915/gt/selftest_engine_heartbeat.c | 110 ++++++++++++++++++ drivers/gpu/drm/i915/i915_priolist_types.h | 1 + .../drm/i915/selftests/i915_live_selftests.h | 1 + 7 files changed, 207 insertions(+), 2 deletions(-) create mode 100644 drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c create mode 100644 drivers/gpu/drm/i915/gt/intel_engine_heartbeat.h create mode 100644 drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index a16a2daef977..2fd4bed188e5 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -78,8 +78,9 @@ gt-y += \ gt/intel_breadcrumbs.o \ gt/intel_context.o \ gt/intel_engine_cs.o \ - gt/intel_engine_pool.o \ + gt/intel_engine_heartbeat.o \ gt/intel_engine_pm.o \ + gt/intel_engine_pool.o \ gt/intel_engine_user.o \ gt/intel_gt.o \ gt/intel_gt_irq.o \ diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c new file mode 100644 index 000000000000..4b9ab7813d54 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c @@ -0,0 +1,77 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2019 Intel Corporation + */ + +#include "i915_request.h" + +#include "intel_context.h" +#include "intel_engine_heartbeat.h" +#include "intel_engine_pm.h" +#include "intel_engine.h" +#include "intel_gt.h" + +static void idle_pulse(struct intel_engine_cs *engine, struct i915_request *rq) +{ + engine->wakeref_serial = READ_ONCE(engine->serial) + 1; + i915_request_add_active_barriers(rq); +} + +int intel_engine_pulse(struct intel_engine_cs *engine) +{ + struct i915_sched_attr attr = { .priority = I915_PRIORITY_BARRIER }; + struct intel_context *ce = engine->kernel_context; + struct i915_request *rq; + int err = 0; + + if (!intel_engine_has_preemption(engine)) + return -ENODEV; + + if (!intel_engine_pm_get_if_awake(engine)) + return 0; + + if (mutex_lock_interruptible(&ce->timeline->mutex)) + goto out_rpm; + + intel_context_enter(ce); + rq = __i915_request_create(ce, GFP_NOWAIT | __GFP_NOWARN); + intel_context_exit(ce); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto out_unlock; + } + + rq->flags |= I915_REQUEST_SENTINEL; + idle_pulse(engine, rq); + + __i915_request_commit(rq); + __i915_request_queue(rq, &attr); + +out_unlock: + mutex_unlock(&ce->timeline->mutex); +out_rpm: + intel_engine_pm_put(engine); + return err; +} + +int intel_engine_flush_barriers(struct intel_engine_cs *engine) +{ + struct i915_request *rq; + + if (llist_empty(&engine->barrier_tasks)) + return 0; + + rq = i915_request_create(engine->kernel_context); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + idle_pulse(engine, rq); + i915_request_add(rq); + + return 0; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftest_engine_heartbeat.c" +#endif diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.h b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.h new file mode 100644 index 000000000000..b334e5aaf78d --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.h @@ -0,0 +1,15 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2019 Intel Corporation + */ + +#ifndef INTEL_ENGINE_HEARTBEAT_H +#define INTEL_ENGINE_HEARTBEAT_H + +struct intel_engine_cs; + +int intel_engine_pulse(struct intel_engine_cs *engine); +int intel_engine_flush_barriers(struct intel_engine_cs *engine); + +#endif /* INTEL_ENGINE_HEARTBEAT_H */ diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c index 67eb6183648a..7d76611d9df1 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c @@ -111,7 +111,7 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine) i915_request_add_active_barriers(rq); /* Install ourselves as a preemption barrier */ - rq->sched.attr.priority = I915_PRIORITY_UNPREEMPTABLE; + rq->sched.attr.priority = I915_PRIORITY_BARRIER; __i915_request_commit(rq); /* Release our exclusive hold on the engine */ diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c new file mode 100644 index 000000000000..49c683d3b244 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c @@ -0,0 +1,110 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2018 Intel Corporation + */ + +#include "i915_drv.h" + +#include "intel_gt_requests.h" +#include "i915_selftest.h" + +static int __live_idle_pulse(struct intel_engine_cs *engine, + int (*fn)(struct intel_engine_cs *cs)) +{ + struct i915_active ref; + int err; + + GEM_BUG_ON(!llist_empty(&engine->barrier_tasks)); + + i915_active_init(&ref, NULL, NULL); + + err = i915_active_acquire_preallocate_barrier(&ref, engine); + if (err) + return err; + + i915_active_acquire_barrier(&ref); + + err = fn(engine); + if (err) { + llist_del_all(&engine->barrier_tasks); + return err; + } + + if (intel_gt_retire_requests_timeout(engine->gt, HZ / 5)) { + intel_gt_set_wedged(engine->gt); + return -ETIME; /* leaking struct i915_active!!! */ + } + + if (atomic_read(&ref.count)) { + pr_err("%s: heartbeat pulse did not flush idle tasks\n", + engine->name); + intel_gt_set_wedged(engine->gt); + return -EINVAL; + } + + return 0; +} + +static int live_idle_flush(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + int err = 0; + + /* Check that we can flush the idle barriers */ + + for_each_engine(engine, gt, id) { + intel_engine_pm_get(engine); + err = __live_idle_pulse(engine, intel_engine_flush_barriers); + intel_engine_pm_put(engine); + if (err) + break; + } + + return err; +} + +static int live_idle_pulse(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + int err = 0; + + /* Check that heartbeat pulses flush the idle barriers */ + + for_each_engine(engine, gt, id) { + intel_engine_pm_get(engine); + err = __live_idle_pulse(engine, intel_engine_pulse); + intel_engine_pm_put(engine); + if (err && err != -ENODEV) + break; + + err = 0; + } + + return err; +} + +int intel_heartbeat_live_selftests(struct drm_i915_private *i915) +{ + static const struct i915_subtest tests[] = { + SUBTEST(live_idle_flush), + SUBTEST(live_idle_pulse), + }; + int saved_hangcheck; + int err; + + if (intel_gt_is_wedged(&i915->gt)) + return 0; + + saved_hangcheck = i915_modparams.enable_hangcheck; + i915_modparams.enable_hangcheck = INT_MAX; + + err = intel_gt_live_subtests(tests, &i915->gt); + + i915_modparams.enable_hangcheck = saved_hangcheck; + return err; +} diff --git a/drivers/gpu/drm/i915/i915_priolist_types.h b/drivers/gpu/drm/i915/i915_priolist_types.h index 21037a2e2038..ae8bb3cb627e 100644 --- a/drivers/gpu/drm/i915/i915_priolist_types.h +++ b/drivers/gpu/drm/i915/i915_priolist_types.h @@ -39,6 +39,7 @@ enum { * active request. */ #define I915_PRIORITY_UNPREEMPTABLE INT_MAX +#define I915_PRIORITY_BARRIER INT_MAX #define __NO_PREEMPTION (I915_PRIORITY_WAIT) diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h index 6daf6599ec79..00a063730bc3 100644 --- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h +++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h @@ -17,6 +17,7 @@ selftest(gt_timelines, intel_timeline_live_selftests) selftest(gt_contexts, intel_context_live_selftests) selftest(gt_lrc, intel_lrc_live_selftests) selftest(gt_pm, intel_gt_pm_live_selftests) +selftest(gt_heartbeat, intel_heartbeat_live_selftests) selftest(requests, i915_request_live_selftests) selftest(active, i915_active_live_selftests) selftest(objects, i915_gem_object_live_selftests)