From patchwork Thu Dec 9 18:51:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12668091 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 3DCC7C433EF for ; Thu, 9 Dec 2021 18:57:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A2A310E237; Thu, 9 Dec 2021 18:57:21 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id EB49D10E234; Thu, 9 Dec 2021 18:57:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639076240; x=1670612240; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=QMRY9/2Sg/dLApOz+9TkX5plCaAnhLuG1/KEB7LeElI=; b=HYSBVLubWNjS400FeY6hv5A/Q07Vu/scQCmhkD67SD/2H4DSiMdWBhsO Ka9v1XU0IlyHBBWr8+UvoPI6aPRuF+zN5+gp0XO4LLsdr8ykZ6eQRoNtb KEx6KTEXgN+d/hpcQY/5aRV94o9j+qGGoIBVG74bn/t0ynFex70XYWRad OUSr5IajZzBmstT03Otev2IPd9WrI8Q9JES/qARnLi4wc4WAkb4CX7p7S 7xIpwkj+A3SgBgJHAp4k9Sqz+PBPY5jiFrdEijpEHwbE9tKHGlxhWtjIt yLvPHXTRlteb+QmrRQsBcbMOnoULFQ9MyKfCKDeuO6TzbmwQS7ymxI2sx w==; X-IronPort-AV: E=McAfee;i="6200,9189,10193"; a="237988229" X-IronPort-AV: E=Sophos;i="5.88,193,1635231600"; d="scan'208";a="237988229" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2021 10:57:08 -0800 X-IronPort-AV: E=Sophos;i="5.88,193,1635231600"; d="scan'208";a="612630549" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2021 10:57:08 -0800 From: Matthew Brost To: , Subject: [PATCH] drm/i915/guc: Remove racey GEM_BUG_ON Date: Thu, 9 Dec 2021 10:51:41 -0800 Message-Id: <20211209185141.21292-1-matthew.brost@intel.com> X-Mailer: git-send-email 2.33.1 MIME-Version: 1.0 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: daniele.ceraolospurio@intel.com, john.c.harrison@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" A full GT can race with the last context put resulting in the context ref count being zero but the destroyed bit not yet being set. Remove GEM_BUG_ON in scrub_guc_desc_for_outstanding_g2h that asserts the destroyed bit must be set in ref count is zero. Signed-off-by: Matthew Brost Reviewed-by: Daniele Ceraolo Spurio --- drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 -- 1 file changed, 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 9b7b4f4e0d91..0f99bb83293a 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1040,8 +1040,6 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc) spin_unlock(&ce->guc_state.lock); - GEM_BUG_ON(!do_put && !destroyed); - if (pending_enable || destroyed || deregister) { decr_outstanding_submission_g2h(guc); if (deregister)