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 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,URIBL_BLOCKED,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 8EA69C4338F for ; Mon, 16 Aug 2021 13:57:17 +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 5CBA0632D1 for ; Mon, 16 Aug 2021 13:57:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 5CBA0632D1 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 9CCE089E7B; Mon, 16 Aug 2021 13:57:04 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id A21A089E36; Mon, 16 Aug 2021 13:56:58 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10077"; a="279607058" X-IronPort-AV: E=Sophos;i="5.84,326,1620716400"; d="scan'208";a="279607058" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2021 06:56:57 -0700 X-IronPort-AV: E=Sophos;i="5.84,326,1620716400"; d="scan'208";a="441091158" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2021 06:56:57 -0700 From: Matthew Brost To: , Cc: Subject: [PATCH 02/22] drm/i915/guc: Fix outstanding G2H accounting Date: Mon, 16 Aug 2021 06:51:19 -0700 Message-Id: <20210816135139.10060-3-matthew.brost@intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210816135139.10060-1-matthew.brost@intel.com> References: <20210816135139.10060-1-matthew.brost@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" A small race that could result in incorrect accounting of the number of outstanding G2H. Basically prior to this patch we did not increment the number of outstanding G2H if we encoutered a GT reset while sending a H2G. This was incorrect as the context state had already been updated to anticipate a G2H response thus the counter should be incremented. Fixes: f4eb1f3fe946 ("drm/i915/guc: Ensure G2H response has space in buffer") Signed-off-by: Matthew Brost Cc: --- drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 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 69faa39da178..b5d3972ae164 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -360,11 +360,13 @@ static int guc_submission_send_busy_loop(struct intel_guc *guc, { int err; - err = intel_guc_send_busy_loop(guc, action, len, g2h_len_dw, loop); - - if (!err && g2h_len_dw) + if (g2h_len_dw) atomic_inc(&guc->outstanding_submission_g2h); + err = intel_guc_send_busy_loop(guc, action, len, g2h_len_dw, loop); + if (err == -EBUSY && g2h_len_dw) + atomic_dec(&guc->outstanding_submission_g2h); + return err; } -- 2.32.0