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=-16.8 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 3568DC433DB for ; Thu, 25 Mar 2021 07:24:56 +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 CDEB6619FC for ; Thu, 25 Mar 2021 07:24:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDEB6619FC Authentication-Results: mail.kernel.org; dmarc=fail (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]:54620 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lPKMP-00064J-S0 for qemu-devel@archiver.kernel.org; Thu, 25 Mar 2021 03:24:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53058) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPKKv-0004Nd-As; Thu, 25 Mar 2021 03:23:21 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:4489) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPKKs-0002zN-5b; Thu, 25 Mar 2021 03:23:21 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4F5c3F1TLwzrZjb; Thu, 25 Mar 2021 15:21:13 +0800 (CST) Received: from huawei.com (10.174.185.226) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.498.0; Thu, 25 Mar 2021 15:23:07 +0800 From: Wang Xingang To: , , , , , , , , , , Subject: [PATCH RFC RESEND v2 3/6] hw/pci: Add pci_root_bus_max_bus Date: Thu, 25 Mar 2021 07:22:42 +0000 Message-ID: <1616656965-23328-4-git-send-email-wangxingang5@huawei.com> X-Mailer: git-send-email 2.6.4.windows.1 In-Reply-To: <1616656965-23328-1-git-send-email-wangxingang5@huawei.com> References: <1616656965-23328-1-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, 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, cenjiahui@huawei.com, wangxingang5@huawei.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 | 34 ++++++++++++++++++++++++++++++++++ include/hw/pci/pci.h | 1 + 2 files changed, 35 insertions(+) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index e17aa9075f..c7957cbf7c 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -538,6 +538,40 @@ 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; + PCIDevice *dev; + int max_bus = 0; + int type, devfn; + uint8_t subordinate; + + 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++) { + 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) { + 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 718b5a454a..e0c69534f4 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -450,6 +450,7 @@ 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