From patchwork Fri Jan 16 01:44:07 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yijing Wang X-Patchwork-Id: 5645391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 7359B9F2ED for ; Fri, 16 Jan 2015 04:12:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4137B2015A for ; Fri, 16 Jan 2015 04:12:53 +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 0E45220123 for ; Fri, 16 Jan 2015 04:12:52 +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 1YByEt-0006Hb-Jj; Fri, 16 Jan 2015 04:10:27 +0000 Received: from szxga01-in.huawei.com ([119.145.14.64]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YBxvT-00057n-6E for linux-arm-kernel@lists.infradead.org; Fri, 16 Jan 2015 03:50:26 +0000 Received: from 172.24.2.119 (EHLO szxeml407-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CHY77847; Fri, 16 Jan 2015 11:47:15 +0800 (CST) Received: from localhost.localdomain (10.175.100.166) by szxeml407-hub.china.huawei.com (10.82.67.94) with Microsoft SMTP Server id 14.3.158.1; Fri, 16 Jan 2015 11:47:03 +0800 From: Yijing Wang To: Bjorn Helgaas Subject: [PATCH 09/28] PCI: Separate pci_host_bridge creation out of pci_create_root_bus() Date: Fri, 16 Jan 2015 09:44:07 +0800 Message-ID: <1421372666-12288-10-git-send-email-wangyijing@huawei.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1421372666-12288-1-git-send-email-wangyijing@huawei.com> References: <1421372666-12288-1-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-20150115_195024_117195_0BA22AF4 X-CRM114-Status: GOOD ( 15.72 ) X-Spam-Score: -0.7 (/) Cc: Liviu Dudau , Tony Luck , Russell King , Arnd Bergmann , Marc Zyngier , linux-pci@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, "David S. Miller" , linux-m68k@lists.linux-m68k.org, Geert Uytterhoeven , linux-alpha@vger.kernel.org, Yijing Wang , linux-ia64@vger.kernel.org, Thomas Gleixner , Guan Xuetao , Yinghai Lu , Jiang Liu , linux-arm-kernel@lists.infradead.org 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 We want to make a generic pci_host_bridge, then we could place common PCI infos like domain number in it. Ripping out pci_host_bridge creation from pci_create_root_bus() make code more better readability. Further more, we could use the generic pci_host_bridge to hold host bridge specific operations like pcibios_root_bridge_prepare(). Signed-off-by: Yijing Wang --- drivers/pci/host-bridge.c | 78 +++++++++++++++++++++++++++++ drivers/pci/probe.c | 121 +++++++++++++++++++-------------------------- include/linux/pci.h | 6 ++- 3 files changed, 134 insertions(+), 71 deletions(-) diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c index 0e5f3c9..c9ee582 100644 --- a/drivers/pci/host-bridge.c +++ b/drivers/pci/host-bridge.c @@ -8,6 +8,84 @@ #include "pci.h" +static LIST_HEAD(pci_host_bridge_list); +static DEFINE_MUTEX(phb_mutex); + +static void pci_release_host_bridge_dev(struct device *dev) +{ + struct pci_host_bridge *bridge = to_pci_host_bridge(dev); + + if (bridge->release_fn) + bridge->release_fn(bridge); + + pci_free_resource_list(&bridge->windows); + kfree(bridge); +} + +struct pci_host_bridge *pci_create_host_bridge( + struct device *parent, u32 db, struct list_head *resources) +{ + int error; + int bus = PCI_BUSNUM(db); + int domain = PCI_DOMAIN(db); + struct pci_host_bridge *host, *temp; + struct pci_host_bridge_window *window, *n; + + host = kzalloc(sizeof(*host), GFP_KERNEL); + if (!host) + return NULL; + + host->busnum = bus; + host->domain = domain; + /* If support CONFIG_PCI_DOMAINS_GENERIC, use + * pci_host_assign_domain_nr() to assign domain + * number instead argu u32 db. + */ + pci_host_assign_domain_nr(host); + + mutex_lock(&phb_mutex); + list_for_each_entry(temp, &pci_host_bridge_list, list) + if (temp->domain == host->domain + && host->busnum == temp->busnum) { + dev_dbg(&host->dev, "pci host bridge pci%04x:%02x exist\n", + host->domain, host->busnum); + mutex_unlock(&phb_mutex); + kfree(host); + return NULL; + } + mutex_unlock(&phb_mutex); + + host->dev.parent = parent; + INIT_LIST_HEAD(&host->windows); + host->dev.release = pci_release_host_bridge_dev; + dev_set_name(&host->dev, "pci%04x:%02x", host->domain, + host->busnum); + + error = device_register(&host->dev); + if (error) { + put_device(&host->dev); + return NULL; + } + + list_for_each_entry_safe(window, n, resources, list) + list_move_tail(&window->list, &host->windows); + + mutex_lock(&phb_mutex); + list_add_tail(&host->list, &pci_host_bridge_list); + mutex_unlock(&phb_mutex); + return host; +} +EXPORT_SYMBOL(pci_create_host_bridge); + +void pci_free_host_bridge(struct pci_host_bridge *host) +{ + mutex_lock(&phb_mutex); + list_del(&host->list); + mutex_unlock(&phb_mutex); + + device_unregister(&host->dev); +} + static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) { while (bus->parent) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 50f58b3..2e0b952 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -502,31 +502,6 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) return b; } -static void pci_release_host_bridge_dev(struct device *dev) -{ - struct pci_host_bridge *bridge = to_pci_host_bridge(dev); - - if (bridge->release_fn) - bridge->release_fn(bridge); - - pci_free_resource_list(&bridge->windows); - - kfree(bridge); -} - -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) -{ - struct pci_host_bridge *bridge; - - bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); - if (!bridge) - return NULL; - - INIT_LIST_HEAD(&bridge->windows); - bridge->bus = b; - return bridge; -} - static const unsigned char pcix_bus_speed[] = { PCI_SPEED_UNKNOWN, /* 0 */ PCI_SPEED_66MHz_PCIX, /* 1 */ @@ -1889,54 +1864,35 @@ void __weak pcibios_remove_bus(struct pci_bus *bus) { } -struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, - struct pci_ops *ops, void *sysdata, struct list_head *resources) +static struct pci_bus *__pci_create_root_bus( + struct pci_host_bridge *bridge, struct pci_ops *ops, + void *sysdata) { int error; - struct pci_host_bridge *bridge; - struct pci_bus *b, *b2; - struct pci_host_bridge_window *window, *n; + struct pci_bus *b; + struct pci_host_bridge_window *window; + struct device *parent; struct resource *res; resource_size_t offset; char bus_addr[64]; char *fmt; - u8 bus = PCI_BUSNUM(db); + parent = bridge->dev.parent; b = pci_alloc_bus(NULL); if (!b) return NULL; b->sysdata = sysdata; b->ops = ops; - b->number = b->busn_res.start = bus; + b->number = b->busn_res.start = bridge->busnum; pci_bus_assign_domain_nr(b, parent); - b2 = pci_find_bus(pci_domain_nr(b), bus); - if (b2) { - /* If we already got to this bus through a different bridge, ignore it */ - dev_dbg(&b2->dev, "bus already known\n"); - goto err_out; - } - bridge = pci_alloc_host_bridge(b); - if (!bridge) - goto err_out; - - bridge->domain = PCI_DOMAIN(db); - bridge->dev.parent = parent; - bridge->dev.release = pci_release_host_bridge_dev; - dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); + bridge->bus = b; + b->bridge = get_device(&bridge->dev); error = pcibios_root_bridge_prepare(bridge); - if (error) { - kfree(bridge); + if (error) goto err_out; - } - error = device_register(&bridge->dev); - if (error) { - put_device(&bridge->dev); - goto err_out; - } - b->bridge = get_device(&bridge->dev); device_enable_async_suspend(b->bridge); pci_set_bus_of_node(b); @@ -1945,10 +1901,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, b->dev.class = &pcibus_class; b->dev.parent = b->bridge; - dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); + dev_set_name(&b->dev, "%04x:%02x", bridge->domain, + bridge->busnum); error = device_register(&b->dev); if (error) - goto class_dev_reg_err; + goto err_out; pcibios_add_bus(b); @@ -1961,12 +1918,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); /* Add initial resources to the bus */ - list_for_each_entry_safe(window, n, resources, list) { - list_move_tail(&window->list, &bridge->windows); + list_for_each_entry(window, &bridge->windows, list) { res = window->res; offset = window->offset; if (res->flags & IORESOURCE_BUS) - pci_bus_insert_busn_res(b, bus, res->end); + pci_bus_insert_busn_res(b, bridge->busnum, res->end); else pci_bus_add_resource(b, res, 0); if (offset) { @@ -1988,14 +1944,23 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, return b; -class_dev_reg_err: - put_device(&bridge->dev); - device_unregister(&bridge->dev); err_out: kfree(b); return NULL; } +struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, + struct pci_ops *ops, void *sysdata, struct list_head *resources) +{ + struct pci_host_bridge *host; + + host = pci_create_host_bridge(parent, db, resources); + if (!host) + return NULL; + + return __pci_create_root_bus(host, ops, sysdata); +} + int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) { struct resource *res = &b->busn_res; @@ -2059,29 +2024,33 @@ void pci_bus_release_busn_res(struct pci_bus *b) res, ret ? "can not be" : "is"); } -struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, - struct pci_ops *ops, void *sysdata, struct list_head *resources) +static struct pci_bus *__pci_scan_root_bus( + struct pci_host_bridge *host, struct pci_ops *ops, + void *sysdata) { + struct pci_host_bridge_window *window; bool found = false; struct pci_bus *b; int max; - list_for_each_entry(window, resources, list) + list_for_each_entry(window, &host->windows, list) if (window->res->flags & IORESOURCE_BUS) { found = true; break; } - b = pci_create_root_bus(parent, db, ops, sysdata, resources); - if (!b) + b = __pci_create_root_bus(host, ops, sysdata); + if (!b) { + pci_free_host_bridge(host); return NULL; + } if (!found) { dev_info(&b->dev, "No busn resource found for root bus, will use [bus %02x-ff]\n", - PCI_BUSNUM(db)); - pci_bus_insert_busn_res(b, PCI_BUSNUM(db), 255); + host->busnum); + pci_bus_insert_busn_res(b, host->busnum, 255); } max = pci_scan_child_bus(b); @@ -2091,6 +2060,18 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, return b; } + +struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, + struct pci_ops *ops, void *sysdata, struct list_head *resources) +{ + struct pci_host_bridge *host; + + host = pci_create_host_bridge(parent, db, resources); + if (!host) + return NULL; + + return __pci_scan_root_bus(host, ops, sysdata); +} EXPORT_SYMBOL(pci_scan_root_bus); struct pci_bus *pci_scan_bus_legacy(u32 db, struct pci_ops *ops, diff --git a/include/linux/pci.h b/include/linux/pci.h index 1b9c799..5ee0033 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -403,8 +403,10 @@ struct pci_host_bridge_window { struct pci_host_bridge { u16 domain; + u16 busnum; struct device dev; struct pci_bus *bus; /* root bus */ + struct list_head list; struct list_head windows; /* pci_host_bridge_windows */ void (*release_fn)(struct pci_host_bridge *); void *release_data; @@ -416,7 +418,8 @@ void pci_set_host_bridge_release(struct pci_host_bridge *bridge, void *release_data); int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge); - +struct pci_host_bridge *pci_create_host_bridge( + struct device *parent, u32 dombus, struct list_head *resources); /* * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond * to P2P or CardBus bridge windows) go in a table. Additional ones (for @@ -774,6 +777,7 @@ struct pci_bus *pci_scan_bus_legacy(u32 dombus, struct pci_ops *ops, void *sysda struct pci_bus *pci_create_root_bus(struct device *parent, u32 dombus, struct pci_ops *ops, void *sysdata, struct list_head *resources); +void pci_free_host_bridge(struct pci_host_bridge *host); int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax); int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax); void pci_bus_release_busn_res(struct pci_bus *b);