From patchwork Tue Dec 25 22:42:36 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 208119 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id B49542C00A5 for ; Wed, 26 Dec 2012 09:37:44 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752508Ab2LYWhQ (ORCPT ); Tue, 25 Dec 2012 17:37:16 -0500 Received: from hydra.sisk.pl ([212.160.235.94]:44457 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751485Ab2LYWhP (ORCPT ); Tue, 25 Dec 2012 17:37:15 -0500 Received: from vostro.rjw.lan (afdo179.neoplus.adsl.tpnet.pl [95.49.92.179]) by hydra.sisk.pl (Postfix) with ESMTPSA id 175FEE52D8; Tue, 25 Dec 2012 23:38:21 +0100 (CET) From: "Rafael J. Wysocki" To: Bjorn Helgaas , "linux-pci@vger.kernel.org" Cc: ACPI Devel Maling List , Greg Kroah-Hartman , LKML , Tony Luck , "H. Peter Anvin" , Yinghai Lu , Jiang Liu , Myron Stowe Subject: [Alternative][PATCH] ACPI / PCI: Set root bridge ACPI handle in advance Date: Tue, 25 Dec 2012 23:42:36 +0100 Message-ID: <5457615.T2WjKPXXC4@vostro.rjw.lan> User-Agent: KMail/4.9.4 (Linux/3.8.0-rc1+; KDE/4.9.4; x86_64; ; ) In-Reply-To: References: <1558789.gX8cmBgyDV@vostro.rjw.lan> <150695156.KNRhubloU5@vostro.rjw.lan> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Rafael J. Wysocki Subject: PCI / ACPI: Set root bridge ACPI handle in advance The ACPI handles of PCI root bridges need to be known to acpi_bind_one(), so that it can create the appropriate "firmware_node" and "physical_node" files for them, but currently the way it gets to know those handles is not exactly straightforward (to put it lightly). This is how it works, roughly: 1. acpi_bus_scan() finds the handle of a PCI root bridge, creates a struct acpi_device object for it and passes that object to acpi_pci_root_add(). 2. acpi_pci_root_add() creates a struct acpi_pci_root object, populates its "device" field with its argument's address (device->handle is the ACPI handle found in step 1). 3. The struct acpi_pci_root object created in step 2 is passed to pci_acpi_scan_root() and used to get resources that are passed to pci_create_root_bus(). 4. pci_create_root_bus() creates a struct pci_host_bridge object and passes its "dev" member to device_register(). 5. platform_notify(), which for systems with ACPI is set to acpi_platform_notify(), is called. So far, so good. Now it starts to be "interesting". 6. acpi_find_bridge_device() is used to find the ACPI handle of the given device (which is the PCI root bridge) and executes acpi_pci_find_root_bridge(), among other things, for the given device object. 7. acpi_pci_find_root_bridge() uses the name (sic!) of the given device object to extract the segment and bus numbers of the PCI root bridge and passes them to acpi_get_pci_rootbridge_handle(). 8. acpi_get_pci_rootbridge_handle() browses the list of ACPI PCI root bridges and finds the one that matches the given segment and bus numbers. Its handle is then used to initialize the ACPI handle of the PCI root bridge's device object by acpi_bind_one(). However, this is *exactly* the ACPI handle we started with in step 1. Needless to say, this is quite embarassing, but it may be avoided thanks to commit f3fd0c8 (ACPI: Allow ACPI handles of devices to be initialized in advance), which makes it possible to initialize the ACPI handle of a device before passing it to device_register(). Accordingly, add a new __weak routine, pcibios_root_bridge_prepare(), defaulting to an empty implementation that can be replaced by the interested architecutres (x86 and ia64 at the moment) with functions that will set the root bridge's ACPI handle before its dev member is passed to device_register(). Make both x86 and ia64 provide such implementations of pcibios_root_bridge_prepare() and remove acpi_pci_find_root_bridge() and acpi_get_pci_rootbridge_handle() that aren't necessary any more. Signed-off-by: Rafael J. Wysocki Acked-by: Bjorn Helgaas Acked-by: Yinghai Lu --- Bjorn, Since you didn't like the implementation used in the previous patch, here's an alternative one using a __weak function. I don't really strongly prefer any of them. The advantage of the present one is that it changes fewer files and directly affects fewer architectures. The disadvantage of it is the addition of the __weak "callback". I wonder what the maintainers of the architectures in question (Peter, Tony) think. Thanks, Rafael --- arch/ia64/pci/pci.c | 8 ++++++++ arch/x86/pci/acpi.c | 9 +++++++++ drivers/acpi/pci_root.c | 18 ------------------ drivers/pci/pci-acpi.c | 19 ------------------- drivers/pci/probe.c | 16 ++++++++++++++++ include/acpi/acpi_bus.h | 1 - include/linux/pci.h | 2 ++ 7 files changed, 35 insertions(+), 38 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux/drivers/pci/probe.c =================================================================== --- linux.orig/drivers/pci/probe.c +++ linux/drivers/pci/probe.c @@ -1632,6 +1632,18 @@ unsigned int pci_scan_child_bus(struct p return max; } +/** + * pcibios_root_bridge_prepare - Platform-specific host bridge setup. + * @bridge: Host bridge to set up. + * + * Default empty implementation. Replace with an architecture-specific setup + * routine, if necessary. + */ +int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + return 0; +} + struct pci_bus *pci_create_root_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources) { @@ -1665,6 +1677,10 @@ struct pci_bus *pci_create_root_bus(stru bridge->dev.parent = parent; bridge->dev.release = pci_release_bus_bridge_dev; dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); + error = pcibios_root_bridge_prepare(bridge); + if (error) + goto bridge_dev_reg_err; + error = device_register(&bridge->dev); if (error) goto bridge_dev_reg_err; Index: linux/include/linux/pci.h =================================================================== --- linux.orig/include/linux/pci.h +++ linux/include/linux/pci.h @@ -378,6 +378,8 @@ void pci_set_host_bridge_release(struct void (*release_fn)(struct pci_host_bridge *), void *release_data); +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge); + /* * 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 Index: linux/arch/x86/pci/acpi.c =================================================================== --- linux.orig/arch/x86/pci/acpi.c +++ linux/arch/x86/pci/acpi.c @@ -593,6 +593,15 @@ struct pci_bus * __devinit pci_acpi_scan return bus; } +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + struct pci_sysdata *sd = bridge->bus->sysdata; + struct pci_root_info *info = container_of(sd, struct pci_root_info, sd); + + ACPI_HANDLE_SET(&bridge->dev, info->bridge->handle); + return 0; +} + int __init pci_acpi_init(void) { struct pci_dev *dev = NULL; Index: linux/arch/ia64/pci/pci.c =================================================================== --- linux.orig/arch/ia64/pci/pci.c +++ linux/arch/ia64/pci/pci.c @@ -396,6 +396,14 @@ out1: return NULL; } +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + struct pci_controller *controller = bridge->bus->sysdata; + + ACPI_HANDLE_SET(&bridge->dev, controller->acpi_handle); + return 0; +} + static int __devinit is_valid_resource(struct pci_dev *dev, int idx) { unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM; Index: linux/drivers/pci/pci-acpi.c =================================================================== --- linux.orig/drivers/pci/pci-acpi.c +++ linux/drivers/pci/pci-acpi.c @@ -302,24 +302,6 @@ static int acpi_pci_find_device(struct d return 0; } -static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) -{ - int num; - unsigned int seg, bus; - - /* - * The string should be the same as root bridge's name - * Please look at 'pci_scan_bus_parented' - */ - num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); - if (num != 2) - return -ENODEV; - *handle = acpi_get_pci_rootbridge_handle(seg, bus); - if (!*handle) - return -ENODEV; - return 0; -} - static void pci_acpi_setup(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); @@ -378,7 +360,6 @@ static void pci_acpi_cleanup(struct devi static struct acpi_bus_type acpi_pci_bus = { .bus = &pci_bus_type, .find_device = acpi_pci_find_device, - .find_bridge = acpi_pci_find_root_bridge, .setup = pci_acpi_setup, .cleanup = pci_acpi_cleanup, }; Index: linux/drivers/acpi/pci_root.c =================================================================== --- linux.orig/drivers/acpi/pci_root.c +++ linux/drivers/acpi/pci_root.c @@ -107,24 +107,6 @@ void acpi_pci_unregister_driver(struct a } EXPORT_SYMBOL(acpi_pci_unregister_driver); -acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) -{ - struct acpi_pci_root *root; - acpi_handle handle = NULL; - - mutex_lock(&acpi_pci_root_lock); - list_for_each_entry(root, &acpi_pci_roots, node) - if ((root->segment == (u16) seg) && - (root->secondary.start == (u16) bus)) { - handle = root->device->handle; - break; - } - mutex_unlock(&acpi_pci_root_lock); - return handle; -} - -EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); - /** * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge * @handle - the ACPI CA node in question. Index: linux/include/acpi/acpi_bus.h =================================================================== --- linux.orig/include/acpi/acpi_bus.h +++ linux/include/acpi/acpi_bus.h @@ -443,7 +443,6 @@ struct acpi_pci_root { /* helper */ acpi_handle acpi_get_child(acpi_handle, u64); int acpi_is_root_bridge(acpi_handle); -acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int); struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle); #define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)ACPI_HANDLE(dev))