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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 2ADB8C433DB for ; Fri, 26 Feb 2021 08:53:53 +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 7CA1E64ECE for ; Fri, 26 Feb 2021 08:53:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7CA1E64ECE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38126 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lFYsh-0000IB-C9 for qemu-devel@archiver.kernel.org; Fri, 26 Feb 2021 03:53:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:50550) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lFYoo-0004uV-Pj; Fri, 26 Feb 2021 03:49:50 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:2942) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lFYoj-0003b6-K7; Fri, 26 Feb 2021 03:49:50 -0500 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4Dn3FL0vpBzMfBM; Fri, 26 Feb 2021 16:47:34 +0800 (CST) Received: from huawei.com (10.174.185.226) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Fri, 26 Feb 2021 16:49:27 +0800 From: Wang Xingang To: Subject: [RFC PATCH 3/4] hw/pci: Add pci_root_bus_max_bus Date: Fri, 26 Feb 2021 08:49:12 +0000 Message-ID: <1614329353-2124-4-git-send-email-wangxingang5@huawei.com> X-Mailer: git-send-email 2.6.4.windows.1 In-Reply-To: <1614329353-2124-1-git-send-email-wangxingang5@huawei.com> References: <1614329353-2124-1-git-send-email-wangxingang5@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.174.185.226] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.191; envelope-from=wangxingang5@huawei.com; helo=szxga05-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: xieyingtai@huawei.com, peter.maydell@linaro.org, cenjiahui@huawei.com, wangxingang5@huawei.com, mst@redhat.com, shannon.zhaosl@gmail.com, qemu-arm@nongnu.org, imammedo@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Xingang Wang This helps to find max bus number of a root bus. Signed-off-by: Xingang Wang Signed-off-by: Jiahui Cen --- hw/pci/pci.c | 33 +++++++++++++++++++++++++++++++++ include/hw/pci/pci.h | 1 + 2 files changed, 34 insertions(+) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index dc969989c9..ed92ce0971 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -516,6 +516,39 @@ int pci_bus_num(PCIBus *s) return PCI_BUS_GET_CLASS(s)->bus_num(s); } +int pci_root_bus_max_bus(PCIBus *bus) +{ + PCIHostState *host; + int max_bus = 0; + int type; + int devfn; + + if (!pci_bus_is_root(bus)) { + return 0; + } + + host = PCI_HOST_BRIDGE(BUS(bus)->parent); + max_bus = pci_bus_num(host->bus); + + for (devfn = 0; devfn < ARRAY_SIZE(host->bus->devices); devfn++) { + PCIDevice *dev = host->bus->devices[devfn]; + + if (!dev) { + continue; + } + + type = dev->config[PCI_HEADER_TYPE] & ~PCI_HEADER_TYPE_MULTI_FUNCTION; + if (type == PCI_HEADER_TYPE_BRIDGE) { + uint8_t subordinate = dev->config[PCI_SUBORDINATE_BUS]; + if (subordinate > max_bus) { + max_bus = subordinate; + } + } + } + + return max_bus; +} + int pci_bus_numa_node(PCIBus *bus) { return PCI_BUS_GET_CLASS(bus)->numa_node(bus); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index 1bc231480f..238b91817a 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -449,6 +449,7 @@ static inline PCIBus *pci_get_bus(const PCIDevice *dev) return PCI_BUS(qdev_get_parent_bus(DEVICE(dev))); } int pci_bus_num(PCIBus *s); +int pci_root_bus_max_bus(PCIBus *bus); static inline int pci_dev_bus_num(const PCIDevice *dev) { return pci_bus_num(pci_get_bus(dev)); -- 2.19.1