From patchwork Tue Oct 17 14:04:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Halil Pasic X-Patchwork-Id: 827043 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3yGcRb1TJLz9sPr for ; Wed, 18 Oct 2017 01:06:03 +1100 (AEDT) Received: from localhost ([::1]:39686 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4SVN-0006av-9r for incoming@patchwork.ozlabs.org; Tue, 17 Oct 2017 10:06:01 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55544) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4SUY-0006U3-KA for qemu-devel@nongnu.org; Tue, 17 Oct 2017 10:05:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e4SUU-0004Vk-Gx for qemu-devel@nongnu.org; Tue, 17 Oct 2017 10:05:10 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45115 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e4SUU-0004VW-9U for qemu-devel@nongnu.org; Tue, 17 Oct 2017 10:05:06 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v9HE4k3M092642 for ; Tue, 17 Oct 2017 10:05:01 -0400 Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) by mx0b-001b2d01.pphosted.com with ESMTP id 2dnjt4291f-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 17 Oct 2017 10:05:01 -0400 Received: from localhost by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 17 Oct 2017 15:04:57 +0100 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v9HE4uNx24445056; Tue, 17 Oct 2017 14:04:56 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 637654204D; Tue, 17 Oct 2017 15:00:30 +0100 (BST) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2BFD642042; Tue, 17 Oct 2017 15:00:30 +0100 (BST) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 17 Oct 2017 15:00:30 +0100 (BST) From: Halil Pasic To: Cornelia Huck , "Dong Jia Shi" Date: Tue, 17 Oct 2017 16:04:47 +0200 X-Mailer: git-send-email 2.13.5 In-Reply-To: <20171017140453.51099-1-pasic@linux.vnet.ibm.com> References: <20171017140453.51099-1-pasic@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17101714-0012-0000-0000-00000582AD2E X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17101714-0013-0000-0000-000018FCFF42 Message-Id: <20171017140453.51099-2-pasic@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-10-17_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1710170197 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v3 1/7] s390x/css: be more consistent if broken beyond repair X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth , Halil Pasic , Pierre Morel , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Calling do_subchannel_work with no function control flags set in SCSW is a programming error. Currently the handle this differently in do_subchannel_work_virtual and do_subchannel_work_passthrough. Let's be consistent and guard with a common assert against this programming error. Signed-off-by: Halil Pasic Reviewed-by: Thomas Huth --- Already applied to Connies s390-next. Included for the sake of completenes (with) the old typo in the commit message. --- hw/s390x/css.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 35683d7954..aa233d5f8a 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -1245,9 +1245,6 @@ int do_subchannel_work_virtual(SubchDev *sch) } else if (s->ctrl & SCSW_FCTL_START_FUNC) { /* Triggered by both ssch and rsch. */ sch_handle_start_func_virtual(sch); - } else { - /* Cannot happen. */ - return 0; } css_inject_io_interrupt(sch); return 0; @@ -1255,22 +1252,17 @@ int do_subchannel_work_virtual(SubchDev *sch) int do_subchannel_work_passthrough(SubchDev *sch) { - int ret; + int ret = 0; SCSW *s = &sch->curr_status.scsw; if (s->ctrl & SCSW_FCTL_CLEAR_FUNC) { /* TODO: Clear handling */ sch_handle_clear_func(sch); - ret = 0; } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) { /* TODO: Halt handling */ sch_handle_halt_func(sch); - ret = 0; } else if (s->ctrl & SCSW_FCTL_START_FUNC) { ret = sch_handle_start_func_passthrough(sch); - } else { - /* Cannot happen. */ - return -ENODEV; } return ret; @@ -1278,11 +1270,11 @@ int do_subchannel_work_passthrough(SubchDev *sch) static int do_subchannel_work(SubchDev *sch) { - if (sch->do_subchannel_work) { - return sch->do_subchannel_work(sch); - } else { + if (!sch->do_subchannel_work) { return -EINVAL; } + g_assert(sch->curr_status.scsw.ctrl & SCSW_CTRL_MASK_FCTL); + return sch->do_subchannel_work(sch); } static void copy_pmcw_to_guest(PMCW *dest, const PMCW *src)