From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9567EC4707F for ; Tue, 25 May 2021 18:06:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 731F0613D8 for ; Tue, 25 May 2021 18:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231710AbhEYSHy (ORCPT ); Tue, 25 May 2021 14:07:54 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:56448 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231208AbhEYSHu (ORCPT ); Tue, 25 May 2021 14:07:50 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI6GI3108446; Tue, 25 May 2021 18:06:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : content-type : mime-version; s=corp-2020-01-29; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=ZEkJs5Yu+cXDx7dq5L2O8uUhS3tCkNy/CMSs8DitD8GgLCH6WjM246FEFIZzT8ZdFWS6 2mzCVTkp0Jn5WBCmI6Cmdn4pJiJwaCNSVBP+MgQPod6Q5oBbtwEmFOaYG9qy2b2SPE/o mTrr5z+hCws/uWdlWQfn7ZGXnBcFnyASFiZDvXyDgD9uVzzk7M+Y5Mtjcz9zBth/DfZq /gv/Tba0n6sJto0gQFAMFEXjPM7JScnDXwy5qztY+Br92iuef6BsswrzFdGCGisLT6jE eUSOctNHmTj4p0BEpebfk8+vXlLtvmBVVrEY5ajYeyJn1I/sLown81B/HeEWKCtP508u HA== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 38q3q8xc02-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:16 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI6DiE185024; Tue, 25 May 2021 18:06:15 GMT Received: from nam04-bn8-obe.outbound.protection.outlook.com (mail-bn8nam08lp2049.outbound.protection.outlook.com [104.47.74.49]) by userp3020.oracle.com with ESMTP id 38qbqsga7e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XiRnF0ESSIHbjPuHaeO0PM1MuSZe56kDXwcdY5aisa0N3UlMuONrw/AuFz5UyTFCjyEWwJakwwjgU4rgVEVh5sp9tH4e0MoqLWgc+m3edCveUmKfNmMnSOP+c9zvHG+WcwNzSP9L1mznR/vcTd9UysnuoHW0ajJwJeXX2IelP/qGkcYj1m1XmXfexd0MLjkdk2FW9mPzW4OeZUfqynCRD92diL1yGCz6LdMkjB5QdqC1sN2NVMqZ6OjeT5n1LSNmNbE8QZoksOvPOKAGIOwJ0SfjbMbazMAPB4XKk/Cps0adYvi8are021Wx4mPUNWsH0jfNQOqPGUMNA87SN/gDOw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=bfTBmL+QFi11fsgJbNRYlks1/Tmh7MbjY9epccHxGgL43UsdvhUCCYkbZyGsNH3w8mwRvDcnK3eNg0uFDARaf9wWJR2ahDT/q6ri/4/VOdS5lUhGr4P31KoTsPvqz7DHZuqf10cn9pDgbJ/AGqFpDTHBaFX0rEIbcmAsmeTMk871oImqW1PYM82zbxt0jWEm3efcWncLbxcFJh7RyWvuVKMFhGeaX48v1N5KbsrVNbOcxFlADDn9OM9Esmu3K5RBozkuTdTwhll6WEW6BeAtvIYdEYDqxyQbzvIbtiRXn/1gN0zTde5N+DYJNcqmk7kuNX+CbDVKdrkJoRV6+g+QIg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=KJjtBF00lee4waJBdc4V5mstmfYVuRFvSplLe/XTJxXJ5oZqUGsBAe7CcrkvlpHBPvOp9AZZLFgF+UWAovnKYCpyq9WFesgDtmcHP64gyRJ7aIThKp2hnRPzuLi2z87TLfkLE4b1+zsfTpPZRKZ0+7YNFK0kyKmxe1YHHVWG2zo= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=oracle.com; Received: from BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) by SJ0PR10MB4639.namprd10.prod.outlook.com (2603:10b6:a03:2db::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4150.25; Tue, 25 May 2021 18:06:11 +0000 Received: from BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0]) by BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0%7]) with mapi id 15.20.4173.020; Tue, 25 May 2021 18:06:11 +0000 From: Mike Christie To: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, stefanha@redhat.com, pbonzini@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, virtualization@lists.linux-foundation.org Cc: Mike Christie Subject: [PATCH 1/9] vhost: move worker thread fields to new struct Date: Tue, 25 May 2021 13:05:52 -0500 Message-Id: <20210525180600.6349-2-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210525180600.6349-1-michael.christie@oracle.com> References: <20210525180600.6349-1-michael.christie@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [73.88.28.6] X-ClientProxiedBy: DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) To BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (73.88.28.6) by DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.12 via Frontend Transport; Tue, 25 May 2021 18:06:09 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fa303427-5ea2-4b41-79f2-08d91fa7c70f X-MS-TrafficTypeDiagnostic: SJ0PR10MB4639: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5797; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB3573.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(39860400002)(396003)(376002)(366004)(136003)(346002)(36756003)(2616005)(83380400001)(4326008)(186003)(316002)(6512007)(6666004)(6486002)(1076003)(8676002)(16526019)(478600001)(2906002)(52116002)(66556008)(38350700002)(86362001)(66476007)(26005)(5660300002)(38100700002)(956004)(66946007)(8936002)(6506007)(107886003)(69590400013);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?Cwyp0HBsjc+v2FHqpwI1Cvi8ItcnnvJIg9Ec50FOPtlvX4x3yHJH9M/ihjC0?= =?us-ascii?Q?pMHWBVSZcbg69PQ1CyewftfqvxiYpnBDzHuRqk+f8yeD27E3XaewlqAMw2Pq?= =?us-ascii?Q?3JaNX1+IG1j/3bJwkQXqf1KwB2rUB2yeKus/17yoE9MhUN6Cz7R/OlBTf69B?= =?us-ascii?Q?vOYwQ5ck8o4zb24Cgy2DXcdWy+WzHbor+qegkoqgTehosVmutbqFndEG1lhc?= =?us-ascii?Q?zwX/mCf51xN5yfZWo+QZP7ZlLZ6LzEvjibgPBxNCOek7YVzpw3xbBKu62grl?= =?us-ascii?Q?bITQPIb6l5WvhPJJL9uaUa0ro29mNYz/QP9kGH6YeU+TlbtTn/60WXm7dFU2?= =?us-ascii?Q?4Q7DmEIZ3678U44WY/IEamig2CQfStmVAm0SU4vQ3bot/jMfhMevtgI5z+uo?= =?us-ascii?Q?FMnXXwYt9aPd5fEGwl3OlU+lNUvoQbEIs2NOFFBcoCnN6l26aMs2NmFptTsV?= =?us-ascii?Q?LzNf8ckxiU6XDyUJhAiaUZE02oDoZlg3SkOJZhUVMzy2pb2Y8tOgfVCDzYUs?= =?us-ascii?Q?uGjtQV4n84+jgD99shRGqso6zd51qoVKRY2tkhv1/t5yVaFUWCQ4H5l7acZm?= =?us-ascii?Q?s9LDT4IemvV79+Q6GKg6VjKBkG8VAzrCnRzbk2BPjoC8Z+ntux5N7WJ5w996?= =?us-ascii?Q?oyYCaS0d/B5J/MmKzsESs3ZwmBMHku90Ho0gkql2n1SPL4Yo/ugvgeL71xDf?= =?us-ascii?Q?ZQl5zikcm3v/Y99tIaX1Ot+72q9cHaZ02cL6az042hR8WUJfIzCNcNIw62SE?= =?us-ascii?Q?ePG6vaq7i4g7gyBI30Xq3YLbfUA5IE+btNTmwq6O+19PsGNk/3v29sK1Mulx?= =?us-ascii?Q?c6JMT+tTm13m92UWrRVs9VtJPGMd6NqUolLudxqDnjGO3I/Y7XsDoTou079f?= =?us-ascii?Q?J4TqskeThXe1JKugxEXzS1eTgh2R2u+ezWx5EusScAnmfbCtdzXjMSsiLO5H?= =?us-ascii?Q?2qbqsLaiLACbphYzH4TWqrxB94NJ5XyM/6SLVL9LJ1rMikNpnjd1ryfj+0I5?= =?us-ascii?Q?YN79wfy9AZqNYVg0LU1tquUBR/YTiX+WPPZA0wbGB3FKe+a9SCuyQk8/TJS1?= =?us-ascii?Q?t/ABONR8jIIlHsxsjaxaMGznNH5soCBdKxL0N2MaNszOOUDdhD/68clA+BVf?= =?us-ascii?Q?9Zmp6x/PwTAxOWIlNgsXLw7QEMDSCH5IWJQzra7dSt46kvHBNPWGajveV+B4?= =?us-ascii?Q?QqXa8jtv6nMjeWWNTn0I+V8LcIJvVJjcYfjwcYFIL2Ji/FteLIwTwqDoaQb8?= =?us-ascii?Q?5G32hpaRe4MWit2P7nEeIYapNcNvOoCDI5IIocvdc2weSMG0YBk1Ub1/506K?= =?us-ascii?Q?AhPWQFQsL9/peE9qUnZ3bfft?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: fa303427-5ea2-4b41-79f2-08d91fa7c70f X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3573.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2021 18:06:11.1024 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: SWhzxd53zRNFYNFax7DefvO5+VBm58jCbCVuATghf/9JcF5lrzwR5g781nLpdxcpeFLE9/+LbSE7aeOq5q17VlSDhlzaBnNA2c+PO9Q6kJ8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB4639 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 X-Proofpoint-GUID: Wl7tpj7NeluM9ThkvHN6nLrXSTupJpOe X-Proofpoint-ORIG-GUID: Wl7tpj7NeluM9ThkvHN6nLrXSTupJpOe X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 clxscore=1015 malwarescore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org This is just a prep patch. It moves the worker related fields to a new vhost_worker struct and moves the code around to create some helpers that will be used in the next patches. Signed-off-by: Mike Christie --- drivers/vhost/vhost.c | 94 +++++++++++++++++++++++++++++-------------- drivers/vhost/vhost.h | 9 ++++- 2 files changed, 70 insertions(+), 33 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index b9e853e6094d..0cd19b1a832e 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -263,8 +263,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work) * sure it was not in the list. * test_and_set_bit() implies a memory barrier. */ - llist_add(&work->node, &dev->work_list); - wake_up_process(dev->worker); + llist_add(&work->node, &dev->worker->work_list); + wake_up_process(dev->worker->task); } } EXPORT_SYMBOL_GPL(vhost_work_queue); @@ -272,7 +272,7 @@ EXPORT_SYMBOL_GPL(vhost_work_queue); /* A lockless hint for busy polling code to exit the loop */ bool vhost_has_work(struct vhost_dev *dev) { - return !llist_empty(&dev->work_list); + return dev->worker && !llist_empty(&dev->worker->work_list); } EXPORT_SYMBOL_GPL(vhost_has_work); @@ -343,7 +343,8 @@ static void vhost_vq_reset(struct vhost_dev *dev, static int vhost_worker(void *data) { - struct vhost_dev *dev = data; + struct vhost_worker *worker = data; + struct vhost_dev *dev = worker->dev; struct vhost_work *work, *work_next; struct llist_node *node; @@ -358,7 +359,7 @@ static int vhost_worker(void *data) break; } - node = llist_del_all(&dev->work_list); + node = llist_del_all(&worker->work_list); if (!node) schedule(); @@ -487,7 +488,6 @@ void vhost_dev_init(struct vhost_dev *dev, dev->byte_weight = byte_weight; dev->use_worker = use_worker; dev->msg_handler = msg_handler; - init_llist_head(&dev->work_list); init_waitqueue_head(&dev->wait); INIT_LIST_HEAD(&dev->read_list); INIT_LIST_HEAD(&dev->pending_list); @@ -579,10 +579,59 @@ static void vhost_detach_mm(struct vhost_dev *dev) dev->mm = NULL; } +static void vhost_worker_free(struct vhost_dev *dev) +{ + struct vhost_worker *worker = dev->worker; + + if (!worker) + return; + + dev->worker = NULL; + WARN_ON(!llist_empty(&worker->work_list)); + kthread_stop(worker->task); + kfree(worker); +} + +static int vhost_worker_create(struct vhost_dev *dev) +{ + struct vhost_worker *worker; + struct task_struct *task; + int ret; + + worker = kzalloc(sizeof(*worker), GFP_KERNEL); + if (!worker) + return -ENOMEM; + + dev->worker = worker; + worker->dev = dev; + init_llist_head(&worker->work_list); + + task = kthread_create(vhost_worker, worker, "vhost-%d", current->pid); + if (IS_ERR(task)) { + ret = PTR_ERR(task); + goto free_worker; + } + + worker->task = task; + wake_up_process(task); /* avoid contributing to loadavg */ + + ret = vhost_attach_cgroups(dev); + if (ret) + goto stop_worker; + + return 0; + +stop_worker: + kthread_stop(worker->task); +free_worker: + kfree(worker); + dev->worker = NULL; + return ret; +} + /* Caller should have device mutex */ long vhost_dev_set_owner(struct vhost_dev *dev) { - struct task_struct *worker; int err; /* Is there an owner already? */ @@ -595,31 +644,18 @@ long vhost_dev_set_owner(struct vhost_dev *dev) dev->kcov_handle = kcov_common_handle(); if (dev->use_worker) { - worker = kthread_create(vhost_worker, dev, - "vhost-%d", current->pid); - if (IS_ERR(worker)) { - err = PTR_ERR(worker); - goto err_worker; - } - - dev->worker = worker; - wake_up_process(worker); /* avoid contributing to loadavg */ - - err = vhost_attach_cgroups(dev); + err = vhost_worker_create(dev); if (err) - goto err_cgroup; + goto err_worker; } err = vhost_dev_alloc_iovecs(dev); if (err) - goto err_cgroup; + goto err_iovecs; return 0; -err_cgroup: - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - } +err_iovecs: + vhost_worker_free(dev); err_worker: vhost_detach_mm(dev); dev->kcov_handle = 0; @@ -712,13 +748,9 @@ void vhost_dev_cleanup(struct vhost_dev *dev) dev->iotlb = NULL; vhost_clear_msg(dev); wake_up_interruptible_poll(&dev->wait, EPOLLIN | EPOLLRDNORM); - WARN_ON(!llist_empty(&dev->work_list)); - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - dev->kcov_handle = 0; - } + vhost_worker_free(dev); vhost_detach_mm(dev); + dev->kcov_handle = 0; } EXPORT_SYMBOL_GPL(vhost_dev_cleanup); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 7d5306d1229d..bfc4563e612f 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -25,6 +25,12 @@ struct vhost_work { unsigned long flags; }; +struct vhost_worker { + struct task_struct *task; + struct llist_head work_list; + struct vhost_dev *dev; +}; + /* Poll a file (eventfd or socket) */ /* Note: there's nothing vhost specific about this structure. */ struct vhost_poll { @@ -149,8 +155,7 @@ struct vhost_dev { struct vhost_virtqueue **vqs; int nvqs; struct eventfd_ctx *log_ctx; - struct llist_head work_list; - struct task_struct *worker; + struct vhost_worker *worker; struct vhost_iotlb *umem; struct vhost_iotlb *iotlb; spinlock_t iotlb_lock; -- 2.25.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E47E7C2B9F8 for ; Tue, 25 May 2021 18:06:24 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8C6EF613D8 for ; Tue, 25 May 2021 18:06:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8C6EF613D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id A27BD60B61; Tue, 25 May 2021 18:06:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ozfU5nvtetJ1; Tue, 25 May 2021 18:06:20 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp3.osuosl.org (Postfix) with ESMTP id EA68F60B4F; Tue, 25 May 2021 18:06:19 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id C5B96C000E; Tue, 25 May 2021 18:06:19 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id B69E3C0001 for ; Tue, 25 May 2021 18:06:18 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 982C983CC2 for ; Tue, 25 May 2021 18:06:18 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp1.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=oracle.com header.b="ZEkJs5Yu"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.b="KJjtBF00" Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6xachtXcG4cW for ; Tue, 25 May 2021 18:06:17 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from userp2130.oracle.com (userp2130.oracle.com [156.151.31.86]) by smtp1.osuosl.org (Postfix) with ESMTPS id A67318361C for ; Tue, 25 May 2021 18:06:17 +0000 (UTC) Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI6GI3108446; Tue, 25 May 2021 18:06:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : content-type : mime-version; s=corp-2020-01-29; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=ZEkJs5Yu+cXDx7dq5L2O8uUhS3tCkNy/CMSs8DitD8GgLCH6WjM246FEFIZzT8ZdFWS6 2mzCVTkp0Jn5WBCmI6Cmdn4pJiJwaCNSVBP+MgQPod6Q5oBbtwEmFOaYG9qy2b2SPE/o mTrr5z+hCws/uWdlWQfn7ZGXnBcFnyASFiZDvXyDgD9uVzzk7M+Y5Mtjcz9zBth/DfZq /gv/Tba0n6sJto0gQFAMFEXjPM7JScnDXwy5qztY+Br92iuef6BsswrzFdGCGisLT6jE eUSOctNHmTj4p0BEpebfk8+vXlLtvmBVVrEY5ajYeyJn1I/sLown81B/HeEWKCtP508u HA== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 38q3q8xc02-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:16 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI6DiE185024; Tue, 25 May 2021 18:06:15 GMT Received: from nam04-bn8-obe.outbound.protection.outlook.com (mail-bn8nam08lp2049.outbound.protection.outlook.com [104.47.74.49]) by userp3020.oracle.com with ESMTP id 38qbqsga7e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XiRnF0ESSIHbjPuHaeO0PM1MuSZe56kDXwcdY5aisa0N3UlMuONrw/AuFz5UyTFCjyEWwJakwwjgU4rgVEVh5sp9tH4e0MoqLWgc+m3edCveUmKfNmMnSOP+c9zvHG+WcwNzSP9L1mznR/vcTd9UysnuoHW0ajJwJeXX2IelP/qGkcYj1m1XmXfexd0MLjkdk2FW9mPzW4OeZUfqynCRD92diL1yGCz6LdMkjB5QdqC1sN2NVMqZ6OjeT5n1LSNmNbE8QZoksOvPOKAGIOwJ0SfjbMbazMAPB4XKk/Cps0adYvi8are021Wx4mPUNWsH0jfNQOqPGUMNA87SN/gDOw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=bfTBmL+QFi11fsgJbNRYlks1/Tmh7MbjY9epccHxGgL43UsdvhUCCYkbZyGsNH3w8mwRvDcnK3eNg0uFDARaf9wWJR2ahDT/q6ri/4/VOdS5lUhGr4P31KoTsPvqz7DHZuqf10cn9pDgbJ/AGqFpDTHBaFX0rEIbcmAsmeTMk871oImqW1PYM82zbxt0jWEm3efcWncLbxcFJh7RyWvuVKMFhGeaX48v1N5KbsrVNbOcxFlADDn9OM9Esmu3K5RBozkuTdTwhll6WEW6BeAtvIYdEYDqxyQbzvIbtiRXn/1gN0zTde5N+DYJNcqmk7kuNX+CbDVKdrkJoRV6+g+QIg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=7mBm+Bv9Nw7pAlhNVJAiAXX8Qk6OFRPwIU7RbgE9xFA=; b=KJjtBF00lee4waJBdc4V5mstmfYVuRFvSplLe/XTJxXJ5oZqUGsBAe7CcrkvlpHBPvOp9AZZLFgF+UWAovnKYCpyq9WFesgDtmcHP64gyRJ7aIThKp2hnRPzuLi2z87TLfkLE4b1+zsfTpPZRKZ0+7YNFK0kyKmxe1YHHVWG2zo= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none; vger.kernel.org; dmarc=none action=none header.from=oracle.com; Received: from BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) by SJ0PR10MB4639.namprd10.prod.outlook.com (2603:10b6:a03:2db::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4150.25; Tue, 25 May 2021 18:06:11 +0000 Received: from BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0]) by BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0%7]) with mapi id 15.20.4173.020; Tue, 25 May 2021 18:06:11 +0000 From: Mike Christie To: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, stefanha@redhat.com, pbonzini@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, virtualization@lists.linux-foundation.org Subject: [PATCH 1/9] vhost: move worker thread fields to new struct Date: Tue, 25 May 2021 13:05:52 -0500 Message-Id: <20210525180600.6349-2-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210525180600.6349-1-michael.christie@oracle.com> References: <20210525180600.6349-1-michael.christie@oracle.com> X-Originating-IP: [73.88.28.6] X-ClientProxiedBy: DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) To BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (73.88.28.6) by DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.12 via Frontend Transport; Tue, 25 May 2021 18:06:09 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fa303427-5ea2-4b41-79f2-08d91fa7c70f X-MS-TrafficTypeDiagnostic: SJ0PR10MB4639: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5797; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BYAPR10MB3573.namprd10.prod.outlook.com; PTR:; CAT:NONE; SFS:(39860400002)(396003)(376002)(366004)(136003)(346002)(36756003)(2616005)(83380400001)(4326008)(186003)(316002)(6512007)(6666004)(6486002)(1076003)(8676002)(16526019)(478600001)(2906002)(52116002)(66556008)(38350700002)(86362001)(66476007)(26005)(5660300002)(38100700002)(956004)(66946007)(8936002)(6506007)(107886003)(69590400013); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?Cwyp0HBsjc+v2FHqpwI1Cvi8ItcnnvJIg9Ec50FOPtlvX4x3yHJH9M/ihjC0?= =?us-ascii?Q?pMHWBVSZcbg69PQ1CyewftfqvxiYpnBDzHuRqk+f8yeD27E3XaewlqAMw2Pq?= =?us-ascii?Q?3JaNX1+IG1j/3bJwkQXqf1KwB2rUB2yeKus/17yoE9MhUN6Cz7R/OlBTf69B?= =?us-ascii?Q?vOYwQ5ck8o4zb24Cgy2DXcdWy+WzHbor+qegkoqgTehosVmutbqFndEG1lhc?= =?us-ascii?Q?zwX/mCf51xN5yfZWo+QZP7ZlLZ6LzEvjibgPBxNCOek7YVzpw3xbBKu62grl?= =?us-ascii?Q?bITQPIb6l5WvhPJJL9uaUa0ro29mNYz/QP9kGH6YeU+TlbtTn/60WXm7dFU2?= =?us-ascii?Q?4Q7DmEIZ3678U44WY/IEamig2CQfStmVAm0SU4vQ3bot/jMfhMevtgI5z+uo?= =?us-ascii?Q?FMnXXwYt9aPd5fEGwl3OlU+lNUvoQbEIs2NOFFBcoCnN6l26aMs2NmFptTsV?= =?us-ascii?Q?LzNf8ckxiU6XDyUJhAiaUZE02oDoZlg3SkOJZhUVMzy2pb2Y8tOgfVCDzYUs?= =?us-ascii?Q?uGjtQV4n84+jgD99shRGqso6zd51qoVKRY2tkhv1/t5yVaFUWCQ4H5l7acZm?= =?us-ascii?Q?s9LDT4IemvV79+Q6GKg6VjKBkG8VAzrCnRzbk2BPjoC8Z+ntux5N7WJ5w996?= =?us-ascii?Q?oyYCaS0d/B5J/MmKzsESs3ZwmBMHku90Ho0gkql2n1SPL4Yo/ugvgeL71xDf?= =?us-ascii?Q?ZQl5zikcm3v/Y99tIaX1Ot+72q9cHaZ02cL6az042hR8WUJfIzCNcNIw62SE?= =?us-ascii?Q?ePG6vaq7i4g7gyBI30Xq3YLbfUA5IE+btNTmwq6O+19PsGNk/3v29sK1Mulx?= =?us-ascii?Q?c6JMT+tTm13m92UWrRVs9VtJPGMd6NqUolLudxqDnjGO3I/Y7XsDoTou079f?= =?us-ascii?Q?J4TqskeThXe1JKugxEXzS1eTgh2R2u+ezWx5EusScAnmfbCtdzXjMSsiLO5H?= =?us-ascii?Q?2qbqsLaiLACbphYzH4TWqrxB94NJ5XyM/6SLVL9LJ1rMikNpnjd1ryfj+0I5?= =?us-ascii?Q?YN79wfy9AZqNYVg0LU1tquUBR/YTiX+WPPZA0wbGB3FKe+a9SCuyQk8/TJS1?= =?us-ascii?Q?t/ABONR8jIIlHsxsjaxaMGznNH5soCBdKxL0N2MaNszOOUDdhD/68clA+BVf?= =?us-ascii?Q?9Zmp6x/PwTAxOWIlNgsXLw7QEMDSCH5IWJQzra7dSt46kvHBNPWGajveV+B4?= =?us-ascii?Q?QqXa8jtv6nMjeWWNTn0I+V8LcIJvVJjcYfjwcYFIL2Ji/FteLIwTwqDoaQb8?= =?us-ascii?Q?5G32hpaRe4MWit2P7nEeIYapNcNvOoCDI5IIocvdc2weSMG0YBk1Ub1/506K?= =?us-ascii?Q?AhPWQFQsL9/peE9qUnZ3bfft?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: fa303427-5ea2-4b41-79f2-08d91fa7c70f X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3573.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2021 18:06:11.1024 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: SWhzxd53zRNFYNFax7DefvO5+VBm58jCbCVuATghf/9JcF5lrzwR5g781nLpdxcpeFLE9/+LbSE7aeOq5q17VlSDhlzaBnNA2c+PO9Q6kJ8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB4639 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 X-Proofpoint-GUID: Wl7tpj7NeluM9ThkvHN6nLrXSTupJpOe X-Proofpoint-ORIG-GUID: Wl7tpj7NeluM9ThkvHN6nLrXSTupJpOe X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 clxscore=1015 malwarescore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This is just a prep patch. It moves the worker related fields to a new vhost_worker struct and moves the code around to create some helpers that will be used in the next patches. Signed-off-by: Mike Christie --- drivers/vhost/vhost.c | 94 +++++++++++++++++++++++++++++-------------- drivers/vhost/vhost.h | 9 ++++- 2 files changed, 70 insertions(+), 33 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index b9e853e6094d..0cd19b1a832e 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -263,8 +263,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work) * sure it was not in the list. * test_and_set_bit() implies a memory barrier. */ - llist_add(&work->node, &dev->work_list); - wake_up_process(dev->worker); + llist_add(&work->node, &dev->worker->work_list); + wake_up_process(dev->worker->task); } } EXPORT_SYMBOL_GPL(vhost_work_queue); @@ -272,7 +272,7 @@ EXPORT_SYMBOL_GPL(vhost_work_queue); /* A lockless hint for busy polling code to exit the loop */ bool vhost_has_work(struct vhost_dev *dev) { - return !llist_empty(&dev->work_list); + return dev->worker && !llist_empty(&dev->worker->work_list); } EXPORT_SYMBOL_GPL(vhost_has_work); @@ -343,7 +343,8 @@ static void vhost_vq_reset(struct vhost_dev *dev, static int vhost_worker(void *data) { - struct vhost_dev *dev = data; + struct vhost_worker *worker = data; + struct vhost_dev *dev = worker->dev; struct vhost_work *work, *work_next; struct llist_node *node; @@ -358,7 +359,7 @@ static int vhost_worker(void *data) break; } - node = llist_del_all(&dev->work_list); + node = llist_del_all(&worker->work_list); if (!node) schedule(); @@ -487,7 +488,6 @@ void vhost_dev_init(struct vhost_dev *dev, dev->byte_weight = byte_weight; dev->use_worker = use_worker; dev->msg_handler = msg_handler; - init_llist_head(&dev->work_list); init_waitqueue_head(&dev->wait); INIT_LIST_HEAD(&dev->read_list); INIT_LIST_HEAD(&dev->pending_list); @@ -579,10 +579,59 @@ static void vhost_detach_mm(struct vhost_dev *dev) dev->mm = NULL; } +static void vhost_worker_free(struct vhost_dev *dev) +{ + struct vhost_worker *worker = dev->worker; + + if (!worker) + return; + + dev->worker = NULL; + WARN_ON(!llist_empty(&worker->work_list)); + kthread_stop(worker->task); + kfree(worker); +} + +static int vhost_worker_create(struct vhost_dev *dev) +{ + struct vhost_worker *worker; + struct task_struct *task; + int ret; + + worker = kzalloc(sizeof(*worker), GFP_KERNEL); + if (!worker) + return -ENOMEM; + + dev->worker = worker; + worker->dev = dev; + init_llist_head(&worker->work_list); + + task = kthread_create(vhost_worker, worker, "vhost-%d", current->pid); + if (IS_ERR(task)) { + ret = PTR_ERR(task); + goto free_worker; + } + + worker->task = task; + wake_up_process(task); /* avoid contributing to loadavg */ + + ret = vhost_attach_cgroups(dev); + if (ret) + goto stop_worker; + + return 0; + +stop_worker: + kthread_stop(worker->task); +free_worker: + kfree(worker); + dev->worker = NULL; + return ret; +} + /* Caller should have device mutex */ long vhost_dev_set_owner(struct vhost_dev *dev) { - struct task_struct *worker; int err; /* Is there an owner already? */ @@ -595,31 +644,18 @@ long vhost_dev_set_owner(struct vhost_dev *dev) dev->kcov_handle = kcov_common_handle(); if (dev->use_worker) { - worker = kthread_create(vhost_worker, dev, - "vhost-%d", current->pid); - if (IS_ERR(worker)) { - err = PTR_ERR(worker); - goto err_worker; - } - - dev->worker = worker; - wake_up_process(worker); /* avoid contributing to loadavg */ - - err = vhost_attach_cgroups(dev); + err = vhost_worker_create(dev); if (err) - goto err_cgroup; + goto err_worker; } err = vhost_dev_alloc_iovecs(dev); if (err) - goto err_cgroup; + goto err_iovecs; return 0; -err_cgroup: - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - } +err_iovecs: + vhost_worker_free(dev); err_worker: vhost_detach_mm(dev); dev->kcov_handle = 0; @@ -712,13 +748,9 @@ void vhost_dev_cleanup(struct vhost_dev *dev) dev->iotlb = NULL; vhost_clear_msg(dev); wake_up_interruptible_poll(&dev->wait, EPOLLIN | EPOLLRDNORM); - WARN_ON(!llist_empty(&dev->work_list)); - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - dev->kcov_handle = 0; - } + vhost_worker_free(dev); vhost_detach_mm(dev); + dev->kcov_handle = 0; } EXPORT_SYMBOL_GPL(vhost_dev_cleanup); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 7d5306d1229d..bfc4563e612f 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -25,6 +25,12 @@ struct vhost_work { unsigned long flags; }; +struct vhost_worker { + struct task_struct *task; + struct llist_head work_list; + struct vhost_dev *dev; +}; + /* Poll a file (eventfd or socket) */ /* Note: there's nothing vhost specific about this structure. */ struct vhost_poll { @@ -149,8 +155,7 @@ struct vhost_dev { struct vhost_virtqueue **vqs; int nvqs; struct eventfd_ctx *log_ctx; - struct llist_head work_list; - struct task_struct *worker; + struct vhost_worker *worker; struct vhost_iotlb *umem; struct vhost_iotlb *iotlb; spinlock_t iotlb_lock; -- 2.25.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization