From patchwork Fri Apr 3 09:25:41 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yijing Wang X-Patchwork-Id: 6155791 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5EC75BF4A6 for ; Fri, 3 Apr 2015 10:09:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 435A0203E1 for ; Fri, 3 Apr 2015 10:09:26 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 48606203DF for ; Fri, 3 Apr 2015 10:09:25 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YdyTz-000828-OX; Fri, 03 Apr 2015 10:05:47 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Ydy6m-00028s-Nv for linux-arm-kernel@lists.infradead.org; Fri, 03 Apr 2015 09:41:51 +0000 Received: from 172.24.2.119 (EHLO szxeml430-hub.china.huawei.com) ([172.24.2.119]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CJI39094; Fri, 03 Apr 2015 17:28:51 +0800 (CST) Received: from localhost.localdomain (10.175.100.166) by szxeml430-hub.china.huawei.com (10.82.67.185) with Microsoft SMTP Server id 14.3.158.1; Fri, 3 Apr 2015 17:28:38 +0800 From: Yijing Wang To: Bjorn Helgaas Subject: [PATCH v9 07/30] PCI: Add default bus resource in pci_host_bridge Date: Fri, 3 Apr 2015 17:25:41 +0800 Message-ID: <1428053164-28277-9-git-send-email-wangyijing@huawei.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1428053164-28277-1-git-send-email-wangyijing@huawei.com> References: <1428053164-28277-1-git-send-email-wangyijing@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.100.166] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150403_024149_223312_861EC3BF X-CRM114-Status: GOOD ( 14.13 ) X-Spam-Score: -2.3 (--) Cc: linux-ia64@vger.kernel.org, linux-pci@vger.kernel.org, Yijing Wang , Guan Xuetao , Russell King , x86@kernel.org, Geert Uytterhoeven , Benjamin Herrenschmidt , Arnd Bergmann , Marc Zyngier , Rusty Russell , linux-m68k@lists.linux-m68k.org, Thomas Gleixner , Yinghai Lu , linux-arm-kernel@lists.infradead.org, dja@axtens.net, Liviu Dudau , Tony Luck , linux-kernel@vger.kernel.org, Jiang Liu , linux-alpha@vger.kernel.org, "David S. Miller" X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If there is no busn resource provided for pci_scan_root_bus(), we would insert a default bus resource (root_bus_number, 255) in root bus, and update the max bus number we found after pci_scan_child_bus(). We also need to hold the default bus resource in pci_host_bridge, then we could identify whether the new pci host bridge conflict with existing one. Signed-off-by: Yijing Wang --- drivers/pci/host-bridge.c | 20 ++++++++++++++++++++ drivers/pci/probe.c | 26 ++++++++++---------------- include/linux/pci.h | 2 ++ 3 files changed, 32 insertions(+), 16 deletions(-) diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c index 7d52a0a..ecc1a7c 100644 --- a/drivers/pci/host-bridge.c +++ b/drivers/pci/host-bridge.c @@ -19,6 +19,25 @@ static void pci_release_host_bridge_dev(struct device *dev) kfree(bridge); } +static void pci_host_update_busn_res( + struct pci_host_bridge *host, int bus, + struct list_head *resources) +{ + struct resource_entry *window; + + resource_list_for_each_entry(window, resources) + if (window->res->flags & IORESOURCE_BUS) + return; + + pr_info( + "No busn resource found for pci%04x:%02x, will use [bus %02x-ff]\n", + host->domain, bus, bus); + host->busn_res.flags = IORESOURCE_BUS; + host->busn_res.start = bus; + host->busn_res.end = 255; + pci_add_resource(resources, &host->busn_res); +} + struct pci_host_bridge *pci_create_host_bridge( struct device *parent, int domain, int bus, struct list_head *resources) @@ -33,6 +52,7 @@ struct pci_host_bridge *pci_create_host_bridge( host->dev.parent = parent; INIT_LIST_HEAD(&host->windows); + pci_host_update_busn_res(host, bus, resources); resource_list_for_each_entry_safe(window, n, resources) list_move_tail(&window->node, &host->windows); /* diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 9bc4784..d5a12d9 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2022,6 +2022,12 @@ int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) return ret; } +static void pci_host_update_busn_res_end( + struct pci_host_bridge *host, int max) +{ + host->busn_res.end = max; +} + void pci_bus_release_busn_res(struct pci_bus *b) { struct resource *res = &b->busn_res; @@ -2040,32 +2046,20 @@ static struct pci_bus *__pci_scan_root_bus(int bus, struct pci_host_bridge *host, struct pci_ops *ops, void *sysdata) { - struct resource_entry *window; - bool found = false; struct pci_bus *b; int max; - resource_list_for_each_entry(window, &host->windows) - if (window->res->flags & IORESOURCE_BUS) { - found = true; - break; - } - b = __pci_create_root_bus(bus, host, ops, sysdata); if (!b) return NULL; - if (!found) { - dev_info(&b->dev, - "No busn resource found for root bus, will use [bus %02x-ff]\n", - bus); - pci_bus_insert_busn_res(b, bus, 255); - } - max = pci_scan_child_bus(b); - if (!found) + /* If default busn resource used, update the max bus number */ + if (host->busn_res.flags & IORESOURCE_BUS) { + pci_host_update_busn_res_end(host, max); pci_bus_update_busn_res_end(b, max); + } return b; } diff --git a/include/linux/pci.h b/include/linux/pci.h index 1542df8..f189dfb 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -404,6 +404,8 @@ struct pci_host_bridge { int domain; struct device dev; struct pci_bus *bus; /* root bus */ + /* we use default bus resource if no bus resource provided */ + struct resource busn_res; struct list_head windows; /* resource_entry */ void (*release_fn)(struct pci_host_bridge *); void *release_data;