From patchwork Mon Jul 18 14:09:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 649547 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org 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 3rtQC84hQcz9sXR for ; Tue, 19 Jul 2016 00:13:56 +1000 (AEST) Received: from localhost ([::1]:47692 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bP9Iw-0007G6-EI for incoming@patchwork.ozlabs.org; Mon, 18 Jul 2016 10:13:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46003) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bP9FI-0004Xj-7R for qemu-devel@nongnu.org; Mon, 18 Jul 2016 10:10:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bP9FB-0001fr-7h for qemu-devel@nongnu.org; Mon, 18 Jul 2016 10:10:07 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:46565) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bP9FA-0001fm-VX for qemu-devel@nongnu.org; Mon, 18 Jul 2016 10:10:01 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u6IE8lS6143980 for ; Mon, 18 Jul 2016 10:10:00 -0400 Received: from e06smtp08.uk.ibm.com (e06smtp08.uk.ibm.com [195.75.94.104]) by mx0a-001b2d01.pphosted.com with ESMTP id 2481yg21a2-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 18 Jul 2016 10:10:00 -0400 Received: from localhost by e06smtp08.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 18 Jul 2016 15:09:24 +0100 X-IBM-Helo: d06dlp01.portsmouth.uk.ibm.com X-IBM-MailFrom: cornelia.huck@de.ibm.com X-IBM-RcptTo: qemu-devel@nongnu.org Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id B0CCE17D805F for ; Mon, 18 Jul 2016 15:10:52 +0100 (BST) Received: from d06av04.portsmouth.uk.ibm.com (d06av04.portsmouth.uk.ibm.com [9.149.37.216]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u6IE9NJ510027432 for ; Mon, 18 Jul 2016 14:09:23 GMT Received: from d06av04.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av04.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u6IE9MXr032163 for ; Mon, 18 Jul 2016 08:09:23 -0600 Received: from gondolin.boeblingen.de.ibm.com (dyn-9-152-224-202.boeblingen.de.ibm.com [9.152.224.202]) by d06av04.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u6IE9IVf031862 (version=TLSv1/SSLv3 cipher=AES256-SHA256 bits=256 verify=NO); Mon, 18 Jul 2016 08:09:21 -0600 From: Cornelia Huck To: qemu-devel@nongnu.org Date: Mon, 18 Jul 2016 16:09:13 +0200 X-Mailer: git-send-email 2.9.2 In-Reply-To: <20160718140913.6304-1-cornelia.huck@de.ibm.com> References: <20160718140913.6304-1-cornelia.huck@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16071814-0032-0000-0000-000001EAD644 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16071814-0033-0000-0000-00001BE53671 Message-Id: <20160718140913.6304-4-cornelia.huck@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-07-18_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1607180158 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH for-2.7 3/3] s390x/css: provide a dev_path for css devices 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: Cornelia Huck , borntraeger@de.ibm.com, jfrei@linux.vnet.ibm.com, agraf@suse.de Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" We need to implement the get_dev_path method for the css bus, or else we might end up with two different devices having the same qdev_path. This was noticed when adding two scsi_hd controllers: The SCSIBus code will produce a non-unique dev_path for vmstate usage if the parent bus does not provide the get_dev_path method. We simply use the device's bus id, as this is unique and we won't have any deeper hierarchy from a channel subsystem perspective anyway. Note that we need to disable this for older machine versions, as this changes the migration format. Reported-by: Marc Hartmayer Reviewed-by: Halil Pasic Reviewed-by: Sascha Silbe Tested-by: Marc Hartmayer Signed-off-by: Cornelia Huck --- hw/s390x/css-bridge.c | 26 +++++++++++++++++++++++++- hw/s390x/s390-virtio-ccw.c | 4 ++++ include/hw/s390x/css-bridge.h | 7 +++++++ 3 files changed, 36 insertions(+), 1 deletion(-) diff --git a/hw/s390x/css-bridge.c b/hw/s390x/css-bridge.c index e4c24e2..9a7f7ee 100644 --- a/hw/s390x/css-bridge.c +++ b/hw/s390x/css-bridge.c @@ -59,11 +59,28 @@ static void virtual_css_bus_reset(BusState *qbus) css_reset(); } +static char *virtual_css_bus_get_dev_path(DeviceState *dev) +{ + CcwDevice *ccw_dev = CCW_DEVICE(dev); + SubchDev *sch = ccw_dev->sch; + VirtualCssBridge *bridge = + VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent); + + /* + * We can't provide a dev path for backward compatibility on + * older machines, as it is visible in the migration stream. + */ + return bridge->css_dev_path ? + g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) : + NULL; +} + static void virtual_css_bus_class_init(ObjectClass *klass, void *data) { BusClass *k = BUS_CLASS(klass); k->reset = virtual_css_bus_reset; + k->get_dev_path = virtual_css_bus_get_dev_path; } static const TypeInfo virtual_css_bus_info = { @@ -95,6 +112,12 @@ VirtualCssBus *virtual_css_bus_init(void) /***************** Virtual-css Bus Bridge Device ********************/ +static Property virtual_css_bridge_properties[] = { + DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path, + true), + DEFINE_PROP_END_OF_LIST(), +}; + static void virtual_css_bridge_class_init(ObjectClass *klass, void *data) { HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); @@ -102,12 +125,13 @@ static void virtual_css_bridge_class_init(ObjectClass *klass, void *data) hc->unplug = ccw_device_unplug; set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); + dc->props = virtual_css_bridge_properties; } static const TypeInfo virtual_css_bridge_info = { .name = TYPE_VIRTUAL_CSS_BRIDGE, .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(SysBusDevice), + .instance_size = sizeof(VirtualCssBridge), .class_init = virtual_css_bridge_class_init, .interfaces = (InterfaceInfo[]) { { TYPE_HOTPLUG_HANDLER }, diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index caf0a68..91d9cef 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -322,6 +322,10 @@ static const TypeInfo ccw_machine_info = { .driver = TYPE_S390_IPL,\ .property = "iplbext_migration",\ .value = "off",\ + }, {\ + .driver = TYPE_VIRTUAL_CSS_BRIDGE,\ + .property = "css_dev_path",\ + .value = "off",\ }, #define CCW_COMPAT_2_5 \ diff --git a/include/hw/s390x/css-bridge.h b/include/hw/s390x/css-bridge.h index ad73c1f..5a0203b 100644 --- a/include/hw/s390x/css-bridge.h +++ b/include/hw/s390x/css-bridge.h @@ -16,7 +16,14 @@ #include "hw/qdev-core.h" /* virtual css bridge */ +typedef struct VirtualCssBridge { + SysBusDevice sysbus_dev; + bool css_dev_path; +} VirtualCssBridge; + #define TYPE_VIRTUAL_CSS_BRIDGE "virtual-css-bridge" +#define VIRTUAL_CSS_BRIDGE(obj) \ + OBJECT_CHECK(VirtualCssBridge, (obj), TYPE_VIRTUAL_CSS_BRIDGE) /* virtual css bus type */ typedef struct VirtualCssBus {