From patchwork Fri Mar 17 03:17:37 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dong Jia Shi X-Patchwork-Id: 9629653 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1322E60132 for ; Fri, 17 Mar 2017 03:25:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 021822851D for ; Fri, 17 Mar 2017 03:25:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E9D9E28679; Fri, 17 Mar 2017 03:25:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 68F592851D for ; Fri, 17 Mar 2017 03:25:41 +0000 (UTC) Received: from localhost ([::1]:46916 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coiWK-0004Ta-Cx for patchwork-qemu-devel@patchwork.kernel.org; Thu, 16 Mar 2017 23:25:40 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56934) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coiPR-0006eM-3v for qemu-devel@nongnu.org; Thu, 16 Mar 2017 23:18:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1coiPM-0000Qj-LV for qemu-devel@nongnu.org; Thu, 16 Mar 2017 23:18:33 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:52453 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 1coiPM-0000Qb-EN for qemu-devel@nongnu.org; Thu, 16 Mar 2017 23:18:28 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v2H3DvuR005271 for ; Thu, 16 Mar 2017 23:18:27 -0400 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0b-001b2d01.pphosted.com with ESMTP id 297nkp1x4b-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 16 Mar 2017 23:18:27 -0400 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 16 Mar 2017 21:18:23 -0600 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v2H3IMik11338160; Thu, 16 Mar 2017 20:18:22 -0700 Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 128446A042; Thu, 16 Mar 2017 21:18:22 -0600 (MDT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP id 30EFA6A03B; Thu, 16 Mar 2017 21:18:20 -0600 (MDT) From: Dong Jia Shi To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, qemu-devel@nongnu.org Date: Fri, 17 Mar 2017 04:17:37 +0100 X-Mailer: git-send-email 2.8.4 In-Reply-To: <20170317031743.40128-1-bjsdjshi@linux.vnet.ibm.com> References: <20170317031743.40128-1-bjsdjshi@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17031703-0020-0000-0000-00000B970A48 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006796; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000206; SDB=6.00834930; UDB=6.00410081; IPR=6.00612586; BA=6.00005215; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00014684; XFM=3.00000013; UTC=2017-03-17 03:18:25 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17031703-0021-0000-0000-00005AEE3155 Message-Id: <20170317031743.40128-11-bjsdjshi@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-03-17_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1703170025 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 v4 10/16] vfio: ccw: realize VFIO_DEVICE_RESET ioctl 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: pasic@linux.vnet.ibm.com, pmorel@linux.vnet.ibm.com, borntraeger@de.ibm.com, alex.williamson@redhat.com, renxiaof@linux.vnet.ibm.com, cornelia.huck@de.ibm.com, bjsdjshi@linux.vnet.ibm.com, agraf@suse.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Introduce VFIO_DEVICE_RESET ioctl for vfio-ccw to make it possible to hot-reset the device. We try to achieve a reset by first disabling the subchannel and then enabling it again: this should clear all state at the subchannel. Signed-off-by: Dong Jia Shi --- drivers/s390/cio/vfio_ccw_ops.c | 47 +++++++++++++++++++++++++++++------------ 1 file changed, 33 insertions(+), 14 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index f3300dd..125818c 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -12,6 +12,32 @@ #include "vfio_ccw_private.h" +static int vfio_ccw_mdev_reset(struct mdev_device *mdev) +{ + struct vfio_ccw_private *private; + struct subchannel *sch; + int ret; + + private = dev_get_drvdata(mdev_parent_dev(mdev)); + if (!private) + return -ENODEV; + + sch = private->sch; + /* + * TODO: + * In the cureent stage, some things like "no I/O running" and "no + * interrupt pending" are clear, but we are not sure what other state + * we need to care about. + * There are still a lot more instructions need to be handled. We + * should come back here later. + */ + ret = vfio_ccw_sch_quiesce(sch); + if (ret) + return ret; + + return cio_enable_subchannel(sch, (u32)(unsigned long)sch); +} + static int vfio_ccw_mdev_notifier(struct notifier_block *nb, unsigned long action, void *data) @@ -28,15 +54,11 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb, */ if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { struct vfio_iommu_type1_dma_unmap *unmap = data; - struct subchannel *sch = private->sch; if (!cp_iova_pinned(&private->cp, unmap->iova)) return NOTIFY_OK; - if (vfio_ccw_sch_quiesce(sch)) - return NOTIFY_BAD; - - if (cio_enable_subchannel(sch, (u32)(unsigned long)sch)) + if (vfio_ccw_mdev_reset(private->mdev)) return NOTIFY_BAD; cp_free(&private->cp); @@ -100,16 +122,11 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) static int vfio_ccw_mdev_remove(struct mdev_device *mdev) { - struct vfio_ccw_private *private; - struct subchannel *sch; + struct vfio_ccw_private *private = + dev_get_drvdata(mdev_parent_dev(mdev)); int ret; - private = dev_get_drvdata(mdev_parent_dev(mdev)); - sch = private->sch; - ret = vfio_ccw_sch_quiesce(sch); - if (ret) - return ret; - ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); + ret = vfio_ccw_mdev_reset(mdev); if (ret) return ret; @@ -190,7 +207,7 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info) { - info->flags = VFIO_DEVICE_FLAGS_CCW; + info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET; info->num_regions = VFIO_CCW_NUM_REGIONS; info->num_irqs = 0; @@ -260,6 +277,8 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, return copy_to_user((void __user *)arg, &info, minsz); } + case VFIO_DEVICE_RESET: + return vfio_ccw_mdev_reset(mdev); default: return -ENOTTY; }