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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 616F7C6FD19 for ; Fri, 10 Mar 2023 09:27:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230183AbjCJJ1p (ORCPT ); Fri, 10 Mar 2023 04:27:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230099AbjCJJ1Z (ORCPT ); Fri, 10 Mar 2023 04:27:25 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 706BD7DD02 for ; Fri, 10 Mar 2023 01:24:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678440244; x=1709976244; h=from:subject:date:message-id:mime-version: content-transfer-encoding:to:cc; bh=CTy6ZzNeoPT63c9yM0XeU/gmCGM5CiKq1s2pnTxJRcU=; b=dXOWfRUOQj7BYn9gZ25DabslzzhiWmjTdQdj5iG/oTIru7i4CVCyBv2U BSq5dU1USLRHFk7gdDdTsYetvO2go8UhpHgEp/3LZJBUAAAU8kajHilQP Nvt2rRtlPYQ/n8H7C6WAXM0PGbNHXXN6P38cr7erLv7vkx9zPBSMYkZjD ewtil1DCv9A3H6JXMcZqtms+IBOgQDtQ5LnZ1fr2qjlf9GK22YHihzQcq DSRBHwBSIDB6Z4QLKmuYkrqcZvDaIJaZHlibcEBaN8U10tnGGL6yI5SSV IHjOlVliClN3cOgekSfZWo47qIljMvzUQDp44Ndb/LWgI+JHGpXCPy5fe w==; X-IronPort-AV: E=McAfee;i="6500,9779,10644"; a="334164673" X-IronPort-AV: E=Sophos;i="5.98,249,1673942400"; d="scan'208";a="334164673" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2023 01:24:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10644"; a="801513237" X-IronPort-AV: E=Sophos;i="5.98,249,1673942400"; d="scan'208";a="801513237" Received: from lab-ah.igk.intel.com ([10.102.42.211]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2023 01:24:01 -0800 From: Andrzej Hajda Subject: [PATCH v6 0/2] drm/i915: add guard page to ggtt->error_capture Date: Fri, 10 Mar 2023 10:23:49 +0100 Message-Id: <20230308-guard_error_capture-v6-0-1b5f31422563@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIACX3CmQC/32NQQqDMBBFryJZNyUaI9JV71FEYjLRgZrIJEqLe PdGD9Dl+5/H21kEQojsUeyMYMOIwWdobgUzk/YjcLSZWSUqKaRo+bhqsj0QBeqNXtJKwJ10UtYA plWOZXPQEfhA2pvpdC3NPOFyPguBw8/Ve3WZJ4wp0PfKb+pc/5c2xQVvbFmXwpZS1eKJPsH7bsL MuuM4fk3G5PTQAAAA To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Andi Shyti , Chris Wilson , Nirmoy Das , Andrzej Hajda X-Mailer: b4 0.11.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch tries to diminish plague of DMAR read errors present in CI for ADL*, RPL*, DG2 platforms, see for example [1] (grep DMAR). CI is usually tolerant for these errors, so the scale of the problem is not really visible. To show it I have counted lines containing DMAR read errors in dmesgs produced by CI for all three versions of the patch, but in contrast to v2 I have grepped only for lines containing "PTE Read access". Below stats for kernel w/o patchset vs patched one. v1: 210 vs 0 v2: 201 vs 0 v3: 214 vs 0 Apparently the patchset fixes all common PTE read errors. Changelog: v2: - modified commit message (I hope the diagnosis is correct), - added bug checks to ensure scratch is initialized on gen3 platforms. CI produces strange stacktrace for it suggesting scratch[0] is NULL, to be removed after resolving the issue with gen3 platforms. v3: - removed bug checks, replaced with gen check. v4: - change code for scratch page insertion to support all platforms, - add info in commit message there could be more similar issues v5: - changed to patchset adding nop_clear_range related code, - re-insert scratch PTEs on resume v6: - use scratch_range To: Jani Nikula To: Joonas Lahtinen To: Rodrigo Vivi To: Tvrtko Ursulin Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Cc: Andi Shyti Cc: Chris Wilson Cc: Nirmoy Das Signed-off-by: Andrzej Hajda --- - Link to v5: https://lore.kernel.org/r/20230308-guard_error_capture-v5-0-6d1410d13540@intel.com --- Andrzej Hajda (2): drm/i915/gt: introduce vm->scratch_range callback drm/i915: add guard page to ggtt->error_capture drivers/gpu/drm/i915/gt/intel_ggtt.c | 43 ++++++++++++++++++++++++++++--- drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c | 1 + drivers/gpu/drm/i915/gt/intel_gtt.h | 2 ++ 3 files changed, 42 insertions(+), 4 deletions(-) --- base-commit: 3cd6c251f39c14df9ab711e3eb56e703b359ff54 change-id: 20230308-guard_error_capture-f3f334eec85f Best regards, -- Andrzej Hajda