From patchwork Sat Dec 11 00:56:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12671415 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 9FB40C433EF for ; Sat, 11 Dec 2021 01:02:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E12DA10E69D; Sat, 11 Dec 2021 01:01:59 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4A32710E68E; Sat, 11 Dec 2021 01:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639184516; x=1670720516; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+t+IYa+onmrRcxvOJjKYFtf3l6LDynZbl3ClATBruNA=; b=QsugoUZ455YdmHSInKxjQdjgxtow4KoyQ4/GD/TQNLlNNTj+cJtGNjeh hHu3ctl8LGnp49lo7WoqbC6ibT1utSK+lg0r3aQaAjW5Q9O/KU4TJcu+M UonvSivPbinJL4q6sYdCqf6w3lDvO7YUgSPYdH7K+Vqg8/coPCVk+DrWq O0FTDgDEN67n0lan00wroT6xKDP2txZtM2wBr+l58peExbZymdZBmezkc DGjX6MLE1Sowl2sJcTpNu0sB8gUeUOqVaGdkRHOZc2agGuxjTQQldn1et qeUXYDpbwefRHVinUykTr3X0yD69L+jwOKTpxWiKoQ7huKDTn229G1E2p w==; X-IronPort-AV: E=McAfee;i="6200,9189,10194"; a="238298246" X-IronPort-AV: E=Sophos;i="5.88,197,1635231600"; d="scan'208";a="238298246" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2021 17:01:42 -0800 X-IronPort-AV: E=Sophos;i="5.88,197,1635231600"; d="scan'208";a="517002955" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2021 17:01:41 -0800 From: Matthew Brost To: , Date: Fri, 10 Dec 2021 16:56:08 -0800 Message-Id: <20211211005612.8575-4-matthew.brost@intel.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211211005612.8575-1-matthew.brost@intel.com> References: <20211211005612.8575-1-matthew.brost@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 3/7] drm/i915/guc: Remove racey GEM_BUG_ON 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" A full GT reset 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. Reviewed-by: Daniele Ceraolo Spurio Signed-off-by: Matthew Brost --- 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 0fb2eeff0262..36c2965db49b 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)