From patchwork Fri Jan 20 23:28:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13110691 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 5CD0CC05027 for ; Fri, 20 Jan 2023 23:29:04 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 564AC10EB23; Fri, 20 Jan 2023 23:28:52 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id A79FC10EB18; Fri, 20 Jan 2023 23:28:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674257329; x=1705793329; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=tGpmEBwL/m/7VuG0h3WlxIVx1zoVSejS4FxSnruKnpo=; b=RWO2/Sk1Z0gGX1jPfb6tz3DyZjhkBIxp6IxxcdpzGds8Ybu4ScO/RNZq sOvQCC8/MNeFs/Te2EC4yRHfIVqhhAyueuk1km0y1U5hP147bQa4P496k KGCfOypxBtkAgoYUAWKRCBmx74mONZWicnn9MV5TBLiNhvqYvYDmyTHUI X97C77WRLCFD+4LqNoA1RdDjEi/chujQz1yRSwCANyiVUes/LNXqVShEm iJNnD8eRbfpn3xnoCG+O9MrxR/GRYhpvNGyBMof7VfcG76msLD7ixlr9A QXxbzfEczcRtBV8liFD3rKRhfpXabtBjsoic27aWVeR0HoCLSEnlN6Shv w==; X-IronPort-AV: E=McAfee;i="6500,9779,10596"; a="324413558" X-IronPort-AV: E=Sophos;i="5.97,233,1669104000"; d="scan'208";a="324413558" 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 15:28:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10596"; a="693021604" X-IronPort-AV: E=Sophos;i="5.97,233,1669104000"; d="scan'208";a="693021604" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by orsmga001.jf.intel.com with ESMTP; 20 Jan 2023 15:28:48 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Subject: [PATCH v4 0/7] Allow error capture without a request & fix locking issues Date: Fri, 20 Jan 2023 15:28:24 -0800 Message-Id: <20230120232831.28177-1-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John Harrison , DRI-Devel@Lists.FreeDesktop.Org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: John Harrison It is technically possible to get a hung context without a valid request. In such a situation, try to provide as much information in the error capture as possible rather than just aborting and capturing nothing. Similarly, in the case of an engine reset failure the GuC is not able to report the guilty context. So try a manual search instead of reporting nothing. While doing all this, it was noticed that the locking was broken in a number of places when searching for hung requests and dumping request info. So fix all that up as well. v2: Tidy up code flow in error capture. Reword some comments/messages. (review feedback from Tvrtko) Also fix up request locking issues from earlier changes noticed during code review of this change. v3: Fix some potential null pointer derefs and a reference leak. Add new patch to refactor the duplicated hung request search code into a common backend agnostic wrapper function and use the correct spinlocks for the correct lists. Also tweak some of the patch descriptions for better accuracy. v4: Shuffle some code around to more appropriate source files. Fix potential leak of GuC capture object after code flow re-org and pull improved info message earlier (Daniele). Also rename the GuC capture object to be more consistent. Signed-off-by: John Harrison John Harrison (7): drm/i915: Fix request locking during error capture & debugfs dump drm/i915: Fix up locking around dumping requests lists drm/i915: Allow error capture without a request drm/i915: Allow error capture of a pending request drm/i915/guc: Look for a guilty context when an engine reset fails drm/i915/guc: Add a debug print on GuC triggered reset drm/i915/guc: Rename GuC register state capture node to be more obvious drivers/gpu/drm/i915/gt/intel_context.c | 4 +- drivers/gpu/drm/i915/gt/intel_context.h | 3 +- drivers/gpu/drm/i915/gt/intel_engine.h | 4 +- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 74 ++++++++------- .../drm/i915/gt/intel_execlists_submission.c | 27 ++++++ .../drm/i915/gt/intel_execlists_submission.h | 4 + .../gpu/drm/i915/gt/uc/intel_guc_capture.c | 8 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 35 ++++++- drivers/gpu/drm/i915/i915_gpu_error.c | 92 ++++++++++--------- drivers/gpu/drm/i915/i915_gpu_error.h | 2 +- 10 files changed, 160 insertions(+), 93 deletions(-)