From patchwork Mon May 11 16:09:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 11541273 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0981D139A for ; Mon, 11 May 2020 16:15:55 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 D23B4206DB for ; Mon, 11 May 2020 16:15:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SYuK8AxG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D23B4206DB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:44776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jYB5u-00037p-1i for patchwork-qemu-devel@patchwork.kernel.org; Mon, 11 May 2020 12:15:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48280) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jYB0Y-0002er-Px for qemu-devel@nongnu.org; Mon, 11 May 2020 12:10:22 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:56920 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jYB0X-0001Cq-Tp for qemu-devel@nongnu.org; Mon, 11 May 2020 12:10:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589213421; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type:in-reply-to:in-reply-to: references:references; bh=z6E8fClkSbbsupJYLxw1Lqcf48MNwJNj/0CvVbP4DbE=; b=SYuK8AxGhlkjdVuQNFTjQSYRmvC+K5U/ZZ77QzeduoQdAbrdjTAmBFAgreDyI73A6GUQKi 00+f7YJxiarUN4pH3kOlzdzOBmuHnrbhS7qshbSHFWKvH3fENhKEqSD76XsEYOpvTTISoP nFuVRawGJm5L8tAxa29szB+GelFu60o= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-505-0Ei92VfpP_aD3WJP1FHoYA-1; Mon, 11 May 2020 12:10:18 -0400 X-MC-Unique: 0Ei92VfpP_aD3WJP1FHoYA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E7350A0BE1; Mon, 11 May 2020 16:10:17 +0000 (UTC) Received: from maximlenovopc.usersys.redhat.com (unknown [10.35.206.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1AC4A5C1B5; Mon, 11 May 2020 16:10:12 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Subject: [PATCH v2 6/7] scsi: Add scsi_device_get Date: Mon, 11 May 2020 19:09:50 +0300 Message-Id: <20200511160951.8733-7-mlevitsk@redhat.com> In-Reply-To: <20200511160951.8733-1-mlevitsk@redhat.com> References: <20200511160951.8733-1-mlevitsk@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/11 01:43:51 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , "Michael S. Tsirkin" , Maxim Levitsky , Paolo Bonzini Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Add scsi_device_get which finds the scsi device and takes a reference to it. Suggested-by: Stefan Hajnoczi Signed-off-by: Maxim Levitsky --- hw/scsi/scsi-bus.c | 31 ++++++++++++++++++++++++------- include/hw/scsi/scsi.h | 2 ++ 2 files changed, 26 insertions(+), 7 deletions(-) diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index 2bf6d005f3..4e15de0bd7 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -1584,8 +1584,13 @@ static char *scsibus_get_fw_dev_path(DeviceState *dev) return g_strdup_printf("channel@%x/%s@%x,%x", d->channel, qdev_fw_name(dev), d->id, d->lun); } - -SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun) +/* + * Finds a matching channel/id/lun device on scsi bus, and + * takes a reference to it and returns it. + * If we don't find exact match (channel/bus/lun), + * we will return the first device which matches channel/bus + * */ +SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int id, int lun) { BusChild *kid; SCSIDevice *target_dev = NULL; @@ -1598,25 +1603,37 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun) if (dev->channel == channel && dev->id == id) { if (dev->lun == lun) { + object_ref(OBJECT(dev)); rcu_read_unlock(); return dev; } - /* - * If we don't find exact match (channel/bus/lun), - * we will return the first device which matches channel/bus - */ - if (!target_dev) { target_dev = dev; } } } + object_ref(OBJECT(target_dev)); rcu_read_unlock(); return target_dev; } +/* + * This function works like scsi_device_get but doesn't take a refernce + * to the returned object. Intended for legacy code + */ +SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun) +{ + SCSIDevice *dev = scsi_device_get(bus, channel, id, lun); + + if (!dev) + return NULL; + + object_unref(OBJECT(dev)); + return dev; +} + /* SCSI request list. For simplicity, pv points to the whole device */ static int put_scsi_requests(QEMUFile *f, void *pv, size_t size, diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h index 332ef602f4..5e1d31ab6d 100644 --- a/include/hw/scsi/scsi.h +++ b/include/hw/scsi/scsi.h @@ -193,7 +193,9 @@ void scsi_generic_read_device_inquiry(SCSIDevice *dev); int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed); int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size, uint8_t *buf, uint8_t buf_size); + SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int target, int lun); +SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int target, int lun); /* scsi-generic.c. */ extern const SCSIReqOps scsi_generic_req_ops;