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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 0A396C77B73 for ; Tue, 25 Apr 2023 17:29:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1prMS4-0006r2-TY; Tue, 25 Apr 2023 13:27:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prMRy-0006nl-SN for qemu-devel@nongnu.org; Tue, 25 Apr 2023 13:27:35 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prMRu-00034G-VK for qemu-devel@nongnu.org; Tue, 25 Apr 2023 13:27:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1682443650; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DrOhiPPcL+d6htjDrKGwRstWfOt7XytfnWLBr7kygzo=; b=cgx9u2122XD8yj2YpcXi23h6QkfTtWtOfl4Y5oXMGoV4v6tuHMMInHqPx2Wr+dHoTAqaM3 1fn/p5Iohta8t9Jc+ofcJAzASG65ZN4XGpVHdxOVY/5LdXbO9l8Q+czbeFxfm89wtmD7J5 qhHTIRTMA9gHDWRXn/3iZ3eWnUr79nY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-557-5iOd8U5FNmmcREp2ZjiRtA-1; Tue, 25 Apr 2023 13:27:24 -0400 X-MC-Unique: 5iOd8U5FNmmcREp2ZjiRtA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E570EA0F39B; Tue, 25 Apr 2023 17:27:23 +0000 (UTC) Received: from localhost (unknown [10.39.193.242]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B15E201E75D; Tue, 25 Apr 2023 17:27:22 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Juan Quintela , Julia Suvorova , Kevin Wolf , xen-devel@lists.xenproject.org, eesposit@redhat.com, Richard Henderson , Fam Zheng , "Michael S. Tsirkin" , Coiby Xu , David Woodhouse , Marcel Apfelbaum , Peter Lieven , Paul Durrant , Stefan Hajnoczi , "Richard W.M. Jones" , qemu-block@nongnu.org, Stefano Garzarella , Anthony Perard , Stefan Weil , Xie Yongji , Paolo Bonzini , Aarushi Mehta , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Eduardo Habkost , Stefano Stabellini , Hanna Reitz , Ronnie Sahlberg Subject: [PATCH v4 02/20] hw/qdev: introduce qdev_is_realized() helper Date: Tue, 25 Apr 2023 13:26:58 -0400 Message-Id: <20230425172716.1033562-3-stefanha@redhat.com> In-Reply-To: <20230425172716.1033562-1-stefanha@redhat.com> References: <20230425172716.1033562-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.171, 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_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add a helper function to check whether the device is realized without requiring the Big QEMU Lock. The next patch adds a second caller. The goal is to avoid spreading DeviceState field accesses throughout the code. Suggested-by: Philippe Mathieu-Daudé Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Stefan Hajnoczi --- include/hw/qdev-core.h | 17 ++++++++++++++--- hw/scsi/scsi-bus.c | 3 +-- 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index bd50ad5ee1..4d734cf35e 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -1,6 +1,7 @@ #ifndef QDEV_CORE_H #define QDEV_CORE_H +#include "qemu/atomic.h" #include "qemu/queue.h" #include "qemu/bitmap.h" #include "qemu/rcu.h" @@ -164,9 +165,6 @@ struct NamedClockList { /** * DeviceState: - * @realized: Indicates whether the device has been fully constructed. - * When accessed outside big qemu lock, must be accessed with - * qatomic_load_acquire() * @reset: ResettableState for the device; handled by Resettable interface. * * This structure should not be accessed directly. We declare it here @@ -332,6 +330,19 @@ DeviceState *qdev_new(const char *name); */ DeviceState *qdev_try_new(const char *name); +/** + * qdev_is_realized: + * @dev: The device to check. + * + * May be called outside big qemu lock. + * + * Returns: %true% if the device has been fully constructed, %false% otherwise. + */ +static inline bool qdev_is_realized(DeviceState *dev) +{ + return qatomic_load_acquire(&dev->realized); +} + /** * qdev_realize: Realize @dev. * @dev: device to realize diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index c97176110c..07275fb631 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -60,8 +60,7 @@ static SCSIDevice *do_scsi_device_find(SCSIBus *bus, * the user access the device. */ - if (retval && !include_unrealized && - !qatomic_load_acquire(&retval->qdev.realized)) { + if (retval && !include_unrealized && !qdev_is_realized(&retval->qdev)) { retval = NULL; } -- 2.39.2