From patchwork Fri Jan 20 23:28:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13110690 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 5FC8EC25B50 for ; Fri, 20 Jan 2023 23:29:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 74AD710EB30; Fri, 20 Jan 2023 23:29:02 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7549810EB22; Fri, 20 Jan 2023 23:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674257330; x=1705793330; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=MXHjO/r51sJWf//8G91MF+USmcK0WCiA3qVITFrftH4=; b=YRxw8ohM+pJ67VXgzqjSExp1fqzW46JFfY5y3LeUG7tEyk5HeU1bABsj Ri2ZchsRIEBfdvCQXzvwzzdnn4mUlfzwidv/gp5sWfId4pGeSjnyFTtCJ iA/SL4sv2WfUxHcZ5f+EsVezwp8hMubwkkqmQYYScn/prTfR02vHtB097 0ABgbxkTiVS+z9Ed2MVhAKsEnYhtL9R9hVqD/VJjkqDMcrioFohJoptuO btEFjsxAf3GuWxZdbf1jOicKAvgaSVFx9bHgpo8pzGO48iYPdkXtCCq7Y fm8X1sV4CUFOaFnOFKxAwc0Ad4CLHZ+fs7vx0o11oVR7FReCcty/PVrUz A==; X-IronPort-AV: E=McAfee;i="6500,9779,10596"; a="324413566" X-IronPort-AV: E=Sophos;i="5.97,233,1669104000"; d="scan'208";a="324413566" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2023 15:28:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10596"; a="693021621" X-IronPort-AV: E=Sophos;i="5.97,233,1669104000"; d="scan'208";a="693021621" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by orsmga001.jf.intel.com with ESMTP; 20 Jan 2023 15:28:49 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Date: Fri, 20 Jan 2023 15:28:29 -0800 Message-Id: <20230120232831.28177-6-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230120232831.28177-1-John.C.Harrison@Intel.com> References: <20230120232831.28177-1-John.C.Harrison@Intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Subject: [Intel-gfx] [PATCH v4 5/7] drm/i915/guc: Look for a guilty context when an engine reset fails 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: , Cc: DRI-Devel@Lists.FreeDesktop.Org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: John Harrison Engine resets are supposed to never fail. But in the case when one does (due to unknown reasons that normally come down to a missing w/a), it is useful to get as much information out of the system as possible. Given that the GuC intentionally dies on such a situation, it is not possible to get a guilty context notification back. So do a manual search instead. Given that GuC is dead, this is safe because GuC won't be changing the engine state asynchronously. v2: Change comment to be less alarming (Tvrtko) Signed-off-by: John Harrison Acked-by: Tvrtko Ursulin Reviewed-by: Daniele Ceraolo Spurio --- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 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 ad4b2848b0f83..b6b4061e4b633 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -4755,11 +4755,24 @@ static void reset_fail_worker_func(struct work_struct *w) guc->submission_state.reset_fail_mask = 0; spin_unlock_irqrestore(&guc->submission_state.lock, flags); - if (likely(reset_fail_mask)) + if (likely(reset_fail_mask)) { + struct intel_engine_cs *engine; + enum intel_engine_id id; + + /* + * GuC is toast at this point - it dead loops after sending the failed + * reset notification. So need to manually determine the guilty context. + * Note that it should be reliable to do this here because the GuC is + * toast and will not be scheduling behind the KMD's back. + */ + for_each_engine_masked(engine, gt, reset_fail_mask, id) + intel_guc_find_hung_context(engine); + intel_gt_handle_error(gt, reset_fail_mask, I915_ERROR_CAPTURE, - "GuC failed to reset engine mask=0x%x\n", + "GuC failed to reset engine mask=0x%x", reset_fail_mask); + } } int intel_guc_engine_failure_process_msg(struct intel_guc *guc,