From patchwork Thu Aug 19 06:16:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12446327 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1146C4320A for ; Thu, 19 Aug 2021 06:22:46 +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 A7765610E5 for ; Thu, 19 Aug 2021 06:22:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A7765610E5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7EDC86E94A; Thu, 19 Aug 2021 06:22:00 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id AD57B6E4B5; Thu, 19 Aug 2021 06:21:56 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10080"; a="216220756" X-IronPort-AV: E=Sophos;i="5.84,334,1620716400"; d="scan'208";a="216220756" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2021 23:21:55 -0700 X-IronPort-AV: E=Sophos;i="5.84,334,1620716400"; d="scan'208";a="511675174" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2021 23:21:54 -0700 From: Matthew Brost To: , Cc: Date: Wed, 18 Aug 2021 23:16:23 -0700 Message-Id: <20210819061639.21051-12-matthew.brost@intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210819061639.21051-1-matthew.brost@intel.com> References: <20210819061639.21051-1-matthew.brost@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 11/27] drm/i915/selftests: Fix memory corruption in live_lrc_isolation 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" GuC submission has exposed an existing memory corruption in live_lrc_isolation. We believe that some writes to the watchdog offsets in the LRC (0x178 & 0x17c) can result in trashing of portions of the address space. With GuC submission there are additional objects which can move the context redzone into the space that is trashed. To workaround this avoid poisoning the watchdog. v2: (Daniel Vetter) - Add VLK ref in code to workaround Signed-off-by: Matthew Brost --- drivers/gpu/drm/i915/gt/selftest_lrc.c | 29 +++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c index b0977a3b699b..cdc6ae48a1e1 100644 --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c @@ -1074,6 +1074,32 @@ record_registers(struct intel_context *ce, goto err_after; } +static u32 safe_offset(u32 offset, u32 reg) +{ + /* XXX skip testing of watchdog - VLK-22772 */ + if (offset == 0x178 || offset == 0x17c) + reg = 0; + + return reg; +} + +static int get_offset_mask(struct intel_engine_cs *engine) +{ + if (GRAPHICS_VER(engine->i915) < 12) + return 0xfff; + + switch (engine->class) { + default: + case RENDER_CLASS: + return 0x07ff; + case COPY_ENGINE_CLASS: + return 0x0fff; + case VIDEO_DECODE_CLASS: + case VIDEO_ENHANCEMENT_CLASS: + return 0x3fff; + } +} + static struct i915_vma *load_context(struct intel_context *ce, u32 poison) { struct i915_vma *batch; @@ -1117,7 +1143,8 @@ static struct i915_vma *load_context(struct intel_context *ce, u32 poison) len = (len + 1) / 2; *cs++ = MI_LOAD_REGISTER_IMM(len); while (len--) { - *cs++ = hw[dw]; + *cs++ = safe_offset(hw[dw] & get_offset_mask(ce->engine), + hw[dw]); *cs++ = poison; dw += 2; }