From patchwork Tue Jan 11 23:11:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12710832 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5D720C433EF for ; Tue, 11 Jan 2022 23:17:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4A71710E64D; Tue, 11 Jan 2022 23:17:05 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id D2F5810E5FB; Tue, 11 Jan 2022 23:17:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1641943023; x=1673479023; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1dDPvrZ6UE/Z4bGG55p7FvZibVuQbOM5PYaM1afWfvA=; b=j2kYryUX97qoiNCNdoBSsDHYxbpZprEoogEEhoZlfWchU3DwchQ4AdOM xEfxVYMLeVgwdEKGT/Dn4zE7VV+YszxdAXgC3eczwKJiD3fGBbVKeWBVk 14lf+LEetpP+i0Y9ni3YugV3rBm5cXycTPqZ+bmx3cq6UIFdSSFo6RSCP rsux+2es2Q9g+n3UZCmyqSdZjudyau75yKsUYWaj2yWDPbYz9GGMhlNjt Dru1bhFxgiAb1iwD8rJQTNpK4OwmF75hC5yj+hx74r6LgLRN3cCWgCjaM 5Gk9yW+2QMqUmv6segai5spCMq02FrZ52RURAEYyJpPO6rdc6sTcJIuHL A==; X-IronPort-AV: E=McAfee;i="6200,9189,10224"; a="230950978" X-IronPort-AV: E=Sophos;i="5.88,281,1635231600"; d="scan'208";a="230950978" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2022 15:17:02 -0800 X-IronPort-AV: E=Sophos;i="5.88,281,1635231600"; d="scan'208";a="613375821" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2022 15:17:02 -0800 From: Matthew Brost To: , Date: Tue, 11 Jan 2022 15:11:08 -0800 Message-Id: <20220111231109.23244-2-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220111231109.23244-1-matthew.brost@intel.com> References: <20220111231109.23244-1-matthew.brost@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 1/2] 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" 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 completes successfully. v2: (Tvrtko) - Skip test if preemption timeout compiled out - Skip test if engine reset isn't supported - Update debug prints to be more descriptive v3: - Add comment explaining test Signed-off-by: Matthew Brost --- drivers/gpu/drm/i915/selftests/i915_request.c | 117 ++++++++++++++++++ 1 file changed, 117 insertions(+) diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c index 7f66f6d299b26..f78de99d5ae1e 100644 --- a/drivers/gpu/drm/i915/selftests/i915_request.c +++ b/drivers/gpu/drm/i915/selftests/i915_request.c @@ -782,6 +782,115 @@ static int __cancel_completed(struct intel_engine_cs *engine) return err; } +/* + * Test to prove a non-preemptable request can be cancelled and a subsequent + * request on the same context can successfully complete after cancallation. + * + * Testing methodology is to create non-preemptable request and submit it, + * wait for spinner to start, create a NOP request and submit it, cancel the + * spinner, wait for spinner to complete and verify it failed with an error, + * finally wait for NOP request to complete verify it succeeded without an + * error. Preemption timeout also reduced / restored so test runs in a timely + * maner. + */ +static int __cancel_reset(struct drm_i915_private *i915, + 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; + + if (!CONFIG_DRM_I915_PREEMPT_TIMEOUT || + !intel_has_reset_engine(engine->gt)) + return 0; + + 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 non-preemptable request\n", + engine->name); + 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", + 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; @@ -814,6 +923,14 @@ static int live_cancel_request(void *arg) return err; if (err2) return err2; + + /* Expects reset so call outside of igt_live_test_* */ + err = __cancel_reset(i915, engine); + if (err) + return err; + + if (igt_flush_test(i915)) + return -EIO; } return 0; From patchwork Tue Jan 11 23:11:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12710831 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 22CE2C433FE for ; Tue, 11 Jan 2022 23:17:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 04E8710E5FB; Tue, 11 Jan 2022 23:17:05 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 296A410E64D; Tue, 11 Jan 2022 23:17:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1641943024; x=1673479024; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bAhAJyY5hfyV7jeXnAGTvViBL+fOq3h+6xLRMaua2Og=; b=M550J2Qt9g3dUwq281iKlnkqpJ9iSUDTg//W+wT7wxqLZtxTx/bXtTaM KypFnQqfiaVkBd6fHRev8zroVZ7JO1DfKbfpCbrqGKOyq5wa4+N+Kaua7 D1fyzAw/N0R30t8+NyOLlUFxhH2lPQKasUEqlSZNrChqFi9qRCWbei/oC cAB5inveGDv4BjWKsZg7iYpKRzC0QqedEfbF+SDsc2Ywqs8d/Tqbr8w9Q oX7HojVYBsWrES5ua3wVLhn4jeYTMUyi1dWPU4G82yJHMVVy8nR27gcI4 KC2h44/I12SNQD4ARzzqq051lKilKrRbGEu7yufTEXPvR2a1P6TuDRBRG Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10224"; a="230950980" X-IronPort-AV: E=Sophos;i="5.88,281,1635231600"; d="scan'208";a="230950980" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2022 15:17:02 -0800 X-IronPort-AV: E=Sophos;i="5.88,281,1635231600"; d="scan'208";a="613375823" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2022 15:17:02 -0800 From: Matthew Brost To: , Date: Tue, 11 Jan 2022 15:11:09 -0800 Message-Id: <20220111231109.23244-3-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220111231109.23244-1-matthew.brost@intel.com> References: <20220111231109.23244-1-matthew.brost@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915/guc: Remove hacks for reset and schedule disable G2H being received out of order 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" In the i915 there are several hacks in place to make request cancelation work with an old version of the GuC which delivered the G2H indicating schedule disable is done before G2H indicating a context reset. Version 69 fixes this, so we can remove these hacks. Signed-off-by: Matthew Brost Reviewed-by: John Harrison --- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 30 ++----------------- 1 file changed, 2 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 23a40f10d376d..3918f1be114fa 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1533,7 +1533,6 @@ static void __guc_reset_context(struct intel_context *ce, bool stalled) unsigned long flags; u32 head; int i, number_children = ce->parallel.number_children; - bool skip = false; struct intel_context *parent = ce; GEM_BUG_ON(intel_context_is_child(ce)); @@ -1544,23 +1543,10 @@ static void __guc_reset_context(struct intel_context *ce, bool stalled) * GuC will implicitly mark the context as non-schedulable when it sends * the reset notification. Make sure our state reflects this change. The * context will be marked enabled on resubmission. - * - * XXX: If the context is reset as a result of the request cancellation - * this G2H is received after the schedule disable complete G2H which is - * wrong as this creates a race between the request cancellation code - * re-submitting the context and this G2H handler. This is a bug in the - * GuC but can be worked around in the meantime but converting this to a - * NOP if a pending enable is in flight as this indicates that a request - * cancellation has occurred. */ spin_lock_irqsave(&ce->guc_state.lock, flags); - if (likely(!context_pending_enable(ce))) - clr_context_enabled(ce); - else - skip = true; + clr_context_enabled(ce); spin_unlock_irqrestore(&ce->guc_state.lock, flags); - if (unlikely(skip)) - goto out_put; /* * For each context in the relationship find the hanging request @@ -1592,7 +1578,6 @@ static void __guc_reset_context(struct intel_context *ce, bool stalled) } __unwind_incomplete_requests(parent); -out_put: intel_context_put(parent); } @@ -2531,12 +2516,6 @@ static void guc_context_cancel_request(struct intel_context *ce, true); } - /* - * XXX: Racey if context is reset, see comment in - * __guc_reset_context(). - */ - flush_work(&ce_to_guc(ce)->ct.requests.worker); - guc_context_unblock(block_context); intel_context_put(ce); } @@ -3971,12 +3950,7 @@ static void guc_handle_context_reset(struct intel_guc *guc, { trace_intel_context_reset(ce); - /* - * XXX: Racey if request cancellation has occurred, see comment in - * __guc_reset_context(). - */ - if (likely(!intel_context_is_banned(ce) && - !context_blocked(ce))) { + if (likely(!intel_context_is_banned(ce))) { capture_error_state(guc, ce); guc_context_replay(ce); } else {