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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 9F321C3A5A2 for ; Tue, 3 Sep 2019 17:04:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4899120870 for ; Tue, 3 Sep 2019 17:04:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ddn.com header.i=@ddn.com header.b="Fh7/Pj/T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730076AbfICREX (ORCPT ); Tue, 3 Sep 2019 13:04:23 -0400 Received: from mail-eopbgr820047.outbound.protection.outlook.com ([40.107.82.47]:14198 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728571AbfICREW (ORCPT ); Tue, 3 Sep 2019 13:04:22 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SEW3U1DrhnPq/q/gBkOWs/xb9KTcblgjxz1Xth7vc0LAA6vZLSCtvOInon/zzStnTfKQ+MYlhqaEVW9hGiZqX9sKE2SLGW9er/xrKYvcQdsUOOC2M+FDEG6SSew6A2khnGCrTrucSd3nmjDuUl07nWG/Q/O3z7uztSSlh1HT4xpBhEv5HtUcnZko6lw6r3TQNn1WK7xPCDG2HbsNPdPIeqZBRK7TG9f6NxzJ6Ou+y6pBBEOdT3/AF6wgqCXEIfPaaUXI4JPOYjrhuC49OwwXMe7Fx1nsL+Hb0B/4/TI6X+4+mJufNSPoP46EwwXYjTQR0CD7j9Ar/ZzrGusC2f1i5A== 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=FE1vkhZEcBTm/jJaftv+DejwqE1+7/QXcmbHN3bXq44=; b=BxBIxDSyWngWgnAnu4zY5SnlMgQO+dp4wYAr3yyX60f16TzBQ1ZVh0Dp2Yoa00eHhDWzVIpyx0GzxN+rAUikxSgcjCEOgUGh45A2+yyT2I47Jxu84JZdQi6FSTr5BGjSE8dXwxywbA8HvAhhqB76UUPXcvRszhH34HB2nTD1oFrnRuWes0kx1veRQvHG8Qie1enNtdow7TUPOg8xUfT6vu/j0C4kM2YktH785IbmP3oYr9VsCE6g5E+HmhF2GNnBKahsMp7d4m2BaD5QCWUbdTtDZF/SF33vdg4tn+5DMS9eGqcVLi6uX87ySKckPBCKenVcK9RPFLei+v3vM0hHQA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=ddn.com; dmarc=pass action=none header.from=ddn.com; dkim=pass header.d=ddn.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ddn.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=FE1vkhZEcBTm/jJaftv+DejwqE1+7/QXcmbHN3bXq44=; b=Fh7/Pj/Tz6qTg6pwJFWwPoWjdGD4hjMuoFrrhuzUoGPXiWeVUI8YRCLfoNA+gLGOzhV/fZ2ATzYq486DYIL/HpIgdl2fE+6emFst9fUM+rLyRbDMS+qalTxEFacb6Y/GGpdENom0+juoWNAM6GSbUQk8Cma2Ysj4jJLNDvq0jXk= Received: from BY5PR19MB3176.namprd19.prod.outlook.com (10.255.160.21) by BY5PR19MB3221.namprd19.prod.outlook.com (10.255.160.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2241.14; Tue, 3 Sep 2019 17:04:20 +0000 Received: from BY5PR19MB3176.namprd19.prod.outlook.com ([fe80::844f:102f:5181:c074]) by BY5PR19MB3176.namprd19.prod.outlook.com ([fe80::844f:102f:5181:c074%3]) with mapi id 15.20.2220.022; Tue, 3 Sep 2019 17:04:20 +0000 From: Matt Lupfer To: "Michael S . Tsirkin" , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , "James E . J . Bottomley" , "Martin K . Petersen" CC: "virtualization@lists.linux-foundation.org" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Matt Lupfer Subject: [PATCH] scsi: virtio_scsi: unplug LUNs when events missed Thread-Topic: [PATCH] scsi: virtio_scsi: unplug LUNs when events missed Thread-Index: AQHVYnmgUCG1mM4ObEKGSGCIQ1xBzg== Date: Tue, 3 Sep 2019 17:04:20 +0000 Message-ID: <20190903170408.32286-1-mlupfer@ddn.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BN6PR03CA0002.namprd03.prod.outlook.com (2603:10b6:404:23::12) To BY5PR19MB3176.namprd19.prod.outlook.com (2603:10b6:a03:184::21) authentication-results: spf=none (sender IP is ) smtp.mailfrom=mlupfer@ddn.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.23.0 x-originating-ip: [107.128.241.61] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: cc3df57e-7d38-49e1-eba6-08d73090c2ff x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:BY5PR19MB3221; x-ms-traffictypediagnostic: BY5PR19MB3221: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; x-forefront-prvs: 01494FA7F7 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(39850400004)(376002)(136003)(366004)(346002)(396003)(189003)(199004)(36756003)(71190400001)(71200400001)(14454004)(25786009)(4326008)(256004)(478600001)(5024004)(66556008)(66476007)(66446008)(64756008)(66946007)(476003)(6486002)(2616005)(86362001)(486006)(8676002)(81156014)(102836004)(81166006)(8936002)(50226002)(386003)(7736002)(6506007)(305945005)(6116002)(3846002)(26005)(5660300002)(2906002)(316002)(186003)(110136005)(54906003)(1076003)(52116002)(99286004)(6512007)(66066001)(6436002)(53936002);DIR:OUT;SFP:1101;SCL:1;SRVR:BY5PR19MB3221;H:BY5PR19MB3176.namprd19.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: ddn.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: RUmvvb9EMpVdSOP5wT+r+RINhpPJNUTNk4b/DHOnu/M9IaKFyUuNdjjERa6bKk9Dlx7GAd/jpk+NfTC1NMisgz1/mRYDu88+JzI6xKs0bzTtIDN6z75g4F+4KINMOilhmac2lvQTI9JNkrG/AuJlorJQpAWs/VmufEgi+1MF7gm2PL8nKxRItYFYrAII8cjyZ63KzlJy7NrG7i+bnqZZ7jeyAMAjBQLAYopZwt58iONTQ8gzKDzdjEJz5rMgPePiTLnUErMmRrAQPHgZfOvTPblMYn+Ex9PjJ7pdsQliJTjN1cc7MX8Htfa9fXXFEm1Daa5eiQyLzn3roSXB/Ed9sHjYpOnbftguKWZalCSPcCGKgMuh1nG2vJWhClcL7Ex4iZ5sPeUhnsoe5mDBpc78zl0kfnlxDmUggZ3OQ5BzJR8= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: ddn.com X-MS-Exchange-CrossTenant-Network-Message-Id: cc3df57e-7d38-49e1-eba6-08d73090c2ff X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Sep 2019 17:04:20.2709 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 753b6e26-6fd3-43e6-8248-3f1735d59bb4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Vt/yFrolFeFtItMqa33m8bCgerKq3VBWspQM6MbtqDFP9VNcOVTyV6OM4vFl5w1v X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR19MB3221 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The event handler calls scsi_scan_host() when events are missed, which will hotplug new LUNs. However, this function won't remove any unplugged LUNs. The result is that hotunplug doesn't work properly when the number of unplugged LUNs exceeds the event queue size (currently 8). Scan existing LUNs when events are missed to check if they are still present. If not, remove them. Signed-off-by: Matt Lupfer --- drivers/scsi/virtio_scsi.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 297e1076e571..18df77bf371b 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -324,6 +324,36 @@ static void virtscsi_handle_param_change(struct virtio= _scsi *vscsi, scsi_device_put(sdev); } =20 +static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi) +{ + struct scsi_device *sdev; + struct Scsi_Host *shost =3D virtio_scsi_host(vscsi->vdev); + unsigned char scsi_cmd[MAX_COMMAND_SIZE]; + int result, inquiry_len, inq_result_len =3D 256; + char *inq_result =3D kmalloc(inq_result_len, GFP_KERNEL); + + shost_for_each_device(sdev, shost) { + inquiry_len =3D sdev->inquiry_len ? sdev->inquiry_len : 36; + + memset(scsi_cmd, 0, sizeof(scsi_cmd)); + scsi_cmd[0] =3D INQUIRY; + scsi_cmd[4] =3D (unsigned char) inquiry_len; + + memset(inq_result, 0, inq_result_len); + + result =3D scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, + inq_result, inquiry_len, NULL, + 2, 3, NULL); + + if (result =3D=3D 0 && inq_result[0] >> 5) { + /* PQ indicates the LUN is not attached */ + scsi_remove_device(sdev); + } + } + + kfree(inq_result); +} + static void virtscsi_handle_event(struct work_struct *work) { struct virtio_scsi_event_node *event_node =3D @@ -335,6 +365,7 @@ static void virtscsi_handle_event(struct work_struct *w= ork) cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) { event->event &=3D ~cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED); + virtscsi_rescan_hotunplug(vscsi); scsi_scan_host(virtio_scsi_host(vscsi->vdev)); } =20 --=20 2.23.0