11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 121da177e4SLinus Torvalds * your option) any later version. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 151da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 171da177e4SLinus Torvalds * General Public License for more details. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 201da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 211da177e4SLinus Torvalds * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <linux/kernel.h> 271da177e4SLinus Torvalds #include <linux/module.h> 281da177e4SLinus Torvalds #include <linux/init.h> 291da177e4SLinus Torvalds #include <linux/types.h> 30d0020f65STaku Izumi #include <linux/mutex.h> 311da177e4SLinus Torvalds #include <linux/pm.h> 32b67ea761SRafael J. Wysocki #include <linux/pm_runtime.h> 331da177e4SLinus Torvalds #include <linux/pci.h> 34990a7ac5SAndrew Patterson #include <linux/pci-acpi.h> 35eca67315SNaga Chumbalkar #include <linux/pci-aspm.h> 361da177e4SLinus Torvalds #include <linux/acpi.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 381da177e4SLinus Torvalds #include <acpi/acpi_bus.h> 391da177e4SLinus Torvalds #include <acpi/acpi_drivers.h> 40415e12b2SRafael J. Wysocki #include <acpi/apei.h> 411da177e4SLinus Torvalds 42a192a958SLen Brown #define PREFIX "ACPI: " 43a192a958SLen Brown 441da177e4SLinus Torvalds #define _COMPONENT ACPI_PCI_COMPONENT 45f52fd66dSLen Brown ACPI_MODULE_NAME("pci_root"); 461da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 471da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 481da177e4SLinus Torvalds static int acpi_pci_root_add(struct acpi_device *device); 491da177e4SLinus Torvalds static int acpi_pci_root_remove(struct acpi_device *device, int type); 50c431ada4SRajesh Shah static int acpi_pci_root_start(struct acpi_device *device); 511da177e4SLinus Torvalds 52415e12b2SRafael J. Wysocki #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ 53415e12b2SRafael J. Wysocki | OSC_ACTIVE_STATE_PWR_SUPPORT \ 54415e12b2SRafael J. Wysocki | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ 55415e12b2SRafael J. Wysocki | OSC_MSI_SUPPORT) 56415e12b2SRafael J. Wysocki 57c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 581ba90e3aSThomas Renninger {"PNP0A03", 0}, 591ba90e3aSThomas Renninger {"", 0}, 601ba90e3aSThomas Renninger }; 611ba90e3aSThomas Renninger MODULE_DEVICE_TABLE(acpi, root_device_ids); 621ba90e3aSThomas Renninger 631da177e4SLinus Torvalds static struct acpi_driver acpi_pci_root_driver = { 64c2b6705bSLen Brown .name = "pci_root", 651da177e4SLinus Torvalds .class = ACPI_PCI_ROOT_CLASS, 661ba90e3aSThomas Renninger .ids = root_device_ids, 671da177e4SLinus Torvalds .ops = { 681da177e4SLinus Torvalds .add = acpi_pci_root_add, 691da177e4SLinus Torvalds .remove = acpi_pci_root_remove, 70c431ada4SRajesh Shah .start = acpi_pci_root_start, 711da177e4SLinus Torvalds }, 721da177e4SLinus Torvalds }; 731da177e4SLinus Torvalds 74d0020f65STaku Izumi /* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */ 75d0020f65STaku Izumi static DEFINE_MUTEX(acpi_pci_root_lock); 761da177e4SLinus Torvalds static LIST_HEAD(acpi_pci_roots); 778ee5bdf3SJiang Liu static LIST_HEAD(acpi_pci_drivers); 781da177e4SLinus Torvalds 7963f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds int acpi_pci_register_driver(struct acpi_pci_driver *driver) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds int n = 0; 84c1aec834SBjorn Helgaas struct acpi_pci_root *root; 851da177e4SLinus Torvalds 86d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 878ee5bdf3SJiang Liu list_add_tail(&driver->node, &acpi_pci_drivers); 88d0020f65STaku Izumi if (driver->add) 89c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) { 9055bfe3c0STaku Izumi driver->add(root); 911da177e4SLinus Torvalds n++; 921da177e4SLinus Torvalds } 93d0020f65STaku Izumi mutex_unlock(&acpi_pci_root_lock); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds return n; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_register_driver); 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 1001da177e4SLinus Torvalds { 101c1aec834SBjorn Helgaas struct acpi_pci_root *root; 1021da177e4SLinus Torvalds 103d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 1048ee5bdf3SJiang Liu list_del(&driver->node); 105d0020f65STaku Izumi if (driver->remove) 106c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) 10755bfe3c0STaku Izumi driver->remove(root); 108d0020f65STaku Izumi mutex_unlock(&acpi_pci_root_lock); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_unregister_driver); 1111da177e4SLinus Torvalds 112d91a0078SJustin Chen acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) 113d91a0078SJustin Chen { 114c1aec834SBjorn Helgaas struct acpi_pci_root *root; 1156507e6ebSTaku Izumi acpi_handle handle = NULL; 116d91a0078SJustin Chen 1176507e6ebSTaku Izumi mutex_lock(&acpi_pci_root_lock); 118c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) 1196ad95513SBjorn Helgaas if ((root->segment == (u16) seg) && 1206507e6ebSTaku Izumi (root->secondary.start == (u16) bus)) { 1216507e6ebSTaku Izumi handle = root->device->handle; 1226507e6ebSTaku Izumi break; 1236507e6ebSTaku Izumi } 1246507e6ebSTaku Izumi mutex_unlock(&acpi_pci_root_lock); 1256507e6ebSTaku Izumi return handle; 126d91a0078SJustin Chen } 127d91a0078SJustin Chen 128d91a0078SJustin Chen EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); 129d91a0078SJustin Chen 13027558203SAlexander Chiang /** 13127558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 13227558203SAlexander Chiang * @handle - the ACPI CA node in question. 13327558203SAlexander Chiang * 13427558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 13527558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 13627558203SAlexander Chiang */ 13727558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 13827558203SAlexander Chiang { 13927558203SAlexander Chiang int ret; 14027558203SAlexander Chiang struct acpi_device *device; 14127558203SAlexander Chiang 14227558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 14327558203SAlexander Chiang if (ret) 14427558203SAlexander Chiang return 0; 14527558203SAlexander Chiang 14627558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 14727558203SAlexander Chiang if (ret) 14827558203SAlexander Chiang return 0; 14927558203SAlexander Chiang else 15027558203SAlexander Chiang return 1; 15127558203SAlexander Chiang } 15227558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 15327558203SAlexander Chiang 1541da177e4SLinus Torvalds static acpi_status 1551da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 1561da177e4SLinus Torvalds { 1576ad95513SBjorn Helgaas struct resource *res = data; 1581da177e4SLinus Torvalds struct acpi_resource_address64 address; 1591da177e4SLinus Torvalds 16050eca3ebSBob Moore if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 16150eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 16250eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 1631da177e4SLinus Torvalds return AE_OK; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds acpi_resource_to_address64(resource, &address); 1661da177e4SLinus Torvalds if ((address.address_length > 0) && 1676ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 1686ad95513SBjorn Helgaas res->start = address.minimum; 1696ad95513SBjorn Helgaas res->end = address.minimum + address.address_length - 1; 1706ad95513SBjorn Helgaas } 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds return AE_OK; 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 175f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1766ad95513SBjorn Helgaas struct resource *res) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds acpi_status status; 1791da177e4SLinus Torvalds 1806ad95513SBjorn Helgaas res->start = -1; 1814be44fcdSLen Brown status = 1824be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1836ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1841da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1851da177e4SLinus Torvalds return status; 1866ad95513SBjorn Helgaas if (res->start == -1) 1871da177e4SLinus Torvalds return AE_ERROR; 1881da177e4SLinus Torvalds return AE_OK; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1912786f6e3SRui Zhang static void acpi_pci_bridge_scan(struct acpi_device *device) 1922786f6e3SRui Zhang { 1932786f6e3SRui Zhang int status; 1942786f6e3SRui Zhang struct acpi_device *child = NULL; 1952786f6e3SRui Zhang 1962786f6e3SRui Zhang if (device->flags.bus_address) 1972786f6e3SRui Zhang if (device->parent && device->parent->ops.bind) { 1982786f6e3SRui Zhang status = device->parent->ops.bind(device); 1992786f6e3SRui Zhang if (!status) { 2002786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 2012786f6e3SRui Zhang acpi_pci_bridge_scan(child); 2022786f6e3SRui Zhang } 2032786f6e3SRui Zhang } 2042786f6e3SRui Zhang } 2052786f6e3SRui Zhang 2063a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 20763f10f0fSKenji Kaneshige 20863f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 20963f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 21063f10f0fSKenji Kaneshige { 2113a9622dcSShaohua Li struct acpi_osc_context context = { 2123a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 2133a9622dcSShaohua Li .rev = 1, 2143a9622dcSShaohua Li .cap.length = 12, 2153a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 2163a9622dcSShaohua Li }; 21763f10f0fSKenji Kaneshige acpi_status status; 21863f10f0fSKenji Kaneshige 2193a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 2203a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 2213a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 2223a9622dcSShaohua Li kfree(context.ret.pointer); 22363f10f0fSKenji Kaneshige } 22463f10f0fSKenji Kaneshige return status; 22563f10f0fSKenji Kaneshige } 22663f10f0fSKenji Kaneshige 227ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 228ab8e8957SRafael J. Wysocki u32 support, 229ab8e8957SRafael J. Wysocki u32 *control) 23063f10f0fSKenji Kaneshige { 23163f10f0fSKenji Kaneshige acpi_status status; 232ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 23363f10f0fSKenji Kaneshige 234ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 235ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 236ab8e8957SRafael J. Wysocki 23763f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 238ab8e8957SRafael J. Wysocki capbuf[OSC_SUPPORT_TYPE] = support; 239ab8e8957SRafael J. Wysocki if (control) { 240ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 241ab8e8957SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; 242ab8e8957SRafael J. Wysocki } else { 243ab8e8957SRafael J. Wysocki /* Run _OSC query for all possible controls. */ 2443a9622dcSShaohua Li capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS; 245ab8e8957SRafael J. Wysocki } 24663f10f0fSKenji Kaneshige 24763f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 24863f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 249ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2502b8fd918SRafael J. Wysocki if (control) 251ab8e8957SRafael J. Wysocki *control = result; 252ab8e8957SRafael J. Wysocki } 25363f10f0fSKenji Kaneshige return status; 25463f10f0fSKenji Kaneshige } 25563f10f0fSKenji Kaneshige 25663f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 25763f10f0fSKenji Kaneshige { 25863f10f0fSKenji Kaneshige acpi_status status; 25963f10f0fSKenji Kaneshige acpi_handle tmp; 26063f10f0fSKenji Kaneshige 26163f10f0fSKenji Kaneshige status = acpi_get_handle(root->device->handle, "_OSC", &tmp); 26263f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 26363f10f0fSKenji Kaneshige return status; 26463f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 265ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 26663f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 26763f10f0fSKenji Kaneshige return status; 26863f10f0fSKenji Kaneshige } 26963f10f0fSKenji Kaneshige 27076d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 27163f10f0fSKenji Kaneshige { 27263f10f0fSKenji Kaneshige struct acpi_pci_root *root; 273cd4faf9cSTaku Izumi struct acpi_device *device; 274c1aec834SBjorn Helgaas 275cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 276cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 27763f10f0fSKenji Kaneshige return NULL; 278cd4faf9cSTaku Izumi 279cd4faf9cSTaku Izumi root = acpi_driver_data(device); 280cd4faf9cSTaku Izumi 281cd4faf9cSTaku Izumi return root; 28263f10f0fSKenji Kaneshige } 28376d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 28463f10f0fSKenji Kaneshige 2852f7bbcebSAlexander Chiang struct acpi_handle_node { 2862f7bbcebSAlexander Chiang struct list_head node; 2872f7bbcebSAlexander Chiang acpi_handle handle; 2882f7bbcebSAlexander Chiang }; 2892f7bbcebSAlexander Chiang 2902f7bbcebSAlexander Chiang /** 2912f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2922f7bbcebSAlexander Chiang * @handle: the handle in question 2932f7bbcebSAlexander Chiang * 2942f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2952f7bbcebSAlexander Chiang * list of PCI devices. 2962f7bbcebSAlexander Chiang * 2972f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2982f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2992f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 3002f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 3012f7bbcebSAlexander Chiang */ 3022f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 3032f7bbcebSAlexander Chiang { 3042f7bbcebSAlexander Chiang int dev, fn; 3052f7bbcebSAlexander Chiang unsigned long long adr; 3062f7bbcebSAlexander Chiang acpi_status status; 3072f7bbcebSAlexander Chiang acpi_handle phandle; 3082f7bbcebSAlexander Chiang struct pci_bus *pbus; 3092f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 3102f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 3112f7bbcebSAlexander Chiang struct acpi_pci_root *root; 3122f7bbcebSAlexander Chiang LIST_HEAD(device_list); 3132f7bbcebSAlexander Chiang 3142f7bbcebSAlexander Chiang /* 3152f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 3162f7bbcebSAlexander Chiang */ 3172f7bbcebSAlexander Chiang phandle = handle; 3182f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 3192f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 3202f7bbcebSAlexander Chiang if (!node) 3212f7bbcebSAlexander Chiang goto out; 3222f7bbcebSAlexander Chiang 3232f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 3242f7bbcebSAlexander Chiang node->handle = phandle; 3252f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 3262f7bbcebSAlexander Chiang 3272f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 3282f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3292f7bbcebSAlexander Chiang goto out; 3302f7bbcebSAlexander Chiang } 3312f7bbcebSAlexander Chiang 3322f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 3332f7bbcebSAlexander Chiang if (!root) 3342f7bbcebSAlexander Chiang goto out; 3352f7bbcebSAlexander Chiang 3362f7bbcebSAlexander Chiang pbus = root->bus; 3372f7bbcebSAlexander Chiang 3382f7bbcebSAlexander Chiang /* 3392f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3402f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3412f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3422f7bbcebSAlexander Chiang */ 3432f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3442f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3452f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3462f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3472f7bbcebSAlexander Chiang goto out; 3482f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3492f7bbcebSAlexander Chiang fn = adr & 0xffff; 3502f7bbcebSAlexander Chiang 3512f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 352412af978STroy Moure if (!pdev || hnd == handle) 3532f7bbcebSAlexander Chiang break; 3542f7bbcebSAlexander Chiang 3552f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3562f7bbcebSAlexander Chiang pci_dev_put(pdev); 357497fb54fSRafael J. Wysocki 358497fb54fSRafael J. Wysocki /* 359497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 360497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 361497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 362497fb54fSRafael J. Wysocki */ 363497fb54fSRafael J. Wysocki if (!pbus) { 364497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 365497fb54fSRafael J. Wysocki pdev = NULL; 366497fb54fSRafael J. Wysocki break; 367497fb54fSRafael J. Wysocki } 3682f7bbcebSAlexander Chiang } 3692f7bbcebSAlexander Chiang out: 3702f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3712f7bbcebSAlexander Chiang kfree(node); 3722f7bbcebSAlexander Chiang 3732f7bbcebSAlexander Chiang return pdev; 3742f7bbcebSAlexander Chiang } 3752f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3762f7bbcebSAlexander Chiang 37763f10f0fSKenji Kaneshige /** 37875fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 37975fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 38075fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 38175fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 38263f10f0fSKenji Kaneshige * 38375fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 38475fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 38575fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 38675fb60f2SRafael J. Wysocki * 38775fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 38875fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 38975fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 39075fb60f2SRafael J. Wysocki * on failure. 39163f10f0fSKenji Kaneshige **/ 39275fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 39363f10f0fSKenji Kaneshige { 39463f10f0fSKenji Kaneshige struct acpi_pci_root *root; 39575fb60f2SRafael J. Wysocki acpi_status status; 39675fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 39775fb60f2SRafael J. Wysocki acpi_handle tmp; 39863f10f0fSKenji Kaneshige 39975fb60f2SRafael J. Wysocki if (!mask) 40075fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 40175fb60f2SRafael J. Wysocki 40275fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 40375fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 40463f10f0fSKenji Kaneshige return AE_TYPE; 40563f10f0fSKenji Kaneshige 40663f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 40763f10f0fSKenji Kaneshige if (!root) 40863f10f0fSKenji Kaneshige return AE_NOT_EXIST; 40963f10f0fSKenji Kaneshige 410b879dc4bSRafael J. Wysocki status = acpi_get_handle(handle, "_OSC", &tmp); 411b879dc4bSRafael J. Wysocki if (ACPI_FAILURE(status)) 412b879dc4bSRafael J. Wysocki return status; 413b879dc4bSRafael J. Wysocki 41463f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 41575fb60f2SRafael J. Wysocki 41675fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 41763f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 41875fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 41963f10f0fSKenji Kaneshige goto out; 42063f10f0fSKenji Kaneshige 42175fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 42275fb60f2SRafael J. Wysocki while (*mask) { 42375fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 42463f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 42563f10f0fSKenji Kaneshige goto out; 42675fb60f2SRafael J. Wysocki if (ctrl == *mask) 42775fb60f2SRafael J. Wysocki break; 42875fb60f2SRafael J. Wysocki ctrl = *mask; 42975fb60f2SRafael J. Wysocki } 4302b8fd918SRafael J. Wysocki 43175fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 43263f10f0fSKenji Kaneshige status = AE_SUPPORT; 43363f10f0fSKenji Kaneshige goto out; 43463f10f0fSKenji Kaneshige } 43563f10f0fSKenji Kaneshige 43663f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = 0; 43763f10f0fSKenji Kaneshige capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; 43875fb60f2SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = ctrl; 43975fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 44063f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 44175fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 44263f10f0fSKenji Kaneshige out: 44363f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 44463f10f0fSKenji Kaneshige return status; 44563f10f0fSKenji Kaneshige } 4469f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 44763f10f0fSKenji Kaneshige 448da095fd3SBill Pemberton static int acpi_pci_root_add(struct acpi_device *device) 4491da177e4SLinus Torvalds { 450f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 451f5eebbe1SBjorn Helgaas acpi_status status; 452f5eebbe1SBjorn Helgaas int result; 453f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 454f5eebbe1SBjorn Helgaas acpi_handle handle; 4552786f6e3SRui Zhang struct acpi_device *child; 4560ef5f8f6SAndrew Patterson u32 flags, base_flags; 4578c33f51dSTaku Izumi bool is_osc_granted = false; 4581da177e4SLinus Torvalds 4596ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 4606ad95513SBjorn Helgaas if (!root) 4616ad95513SBjorn Helgaas return -ENOMEM; 4626ad95513SBjorn Helgaas 463f5eebbe1SBjorn Helgaas segment = 0; 464f5eebbe1SBjorn Helgaas status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, 465f5eebbe1SBjorn Helgaas &segment); 466f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 467f5eebbe1SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); 4686ad95513SBjorn Helgaas result = -ENODEV; 4696ad95513SBjorn Helgaas goto end; 470f5eebbe1SBjorn Helgaas } 4711da177e4SLinus Torvalds 472f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 4736ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 4746ad95513SBjorn Helgaas status = try_get_root_bridge_busnr(device->handle, &root->secondary); 475f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 4766ad95513SBjorn Helgaas /* 4776ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 4786ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 4796ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 4806ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 4816ad95513SBjorn Helgaas */ 4826ad95513SBjorn Helgaas root->secondary.end = 0xFF; 4836ad95513SBjorn Helgaas printk(KERN_WARNING FW_BUG PREFIX 4846ad95513SBjorn Helgaas "no secondary bus range in _CRS\n"); 485e545b55aSJon Mason status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, 486e545b55aSJon Mason NULL, &bus); 4876ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 4886ad95513SBjorn Helgaas root->secondary.start = bus; 4896ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 4906ad95513SBjorn Helgaas root->secondary.start = 0; 4916ad95513SBjorn Helgaas else { 4926ad95513SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); 4936ad95513SBjorn Helgaas result = -ENODEV; 4946ad95513SBjorn Helgaas goto end; 495f5eebbe1SBjorn Helgaas } 496f5eebbe1SBjorn Helgaas } 4971da177e4SLinus Torvalds 498f5eebbe1SBjorn Helgaas INIT_LIST_HEAD(&root->node); 49932917e5bSPatrick Mochel root->device = device; 5000705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5011da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5021da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 503db89b4f0SPavel Machek device->driver_data = root; 5041da177e4SLinus Torvalds 505d4761ba2SBjorn Helgaas printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", 506d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 507d4761ba2SBjorn Helgaas root->segment, &root->secondary); 508d4761ba2SBjorn Helgaas 509d4761ba2SBjorn Helgaas /* 510d4761ba2SBjorn Helgaas * PCI Routing Table 511d4761ba2SBjorn Helgaas * ----------------- 512d4761ba2SBjorn Helgaas * Evaluate and parse _PRT, if exists. 513d4761ba2SBjorn Helgaas */ 514d4761ba2SBjorn Helgaas status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); 515d4761ba2SBjorn Helgaas if (ACPI_SUCCESS(status)) 516d4761ba2SBjorn Helgaas result = acpi_pci_irq_add_prt(device->handle, root->segment, 517d4761ba2SBjorn Helgaas root->secondary.start); 518d4761ba2SBjorn Helgaas 519f4b57a3bSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle); 520f4b57a3bSJiang Liu 5211da177e4SLinus Torvalds /* 522990a7ac5SAndrew Patterson * All supported architectures that use ACPI have support for 523990a7ac5SAndrew Patterson * PCI domains, so we indicate this in _OSC support capabilities. 524990a7ac5SAndrew Patterson */ 5250ef5f8f6SAndrew Patterson flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 52663f10f0fSKenji Kaneshige acpi_pci_osc_support(root, flags); 527990a7ac5SAndrew Patterson 5288c33f51dSTaku Izumi /* Indicate support for various _OSC capabilities. */ 5298c33f51dSTaku Izumi if (pci_ext_cfg_avail()) 5308c33f51dSTaku Izumi flags |= OSC_EXT_PCI_CONFIG_SUPPORT; 5318c33f51dSTaku Izumi if (pcie_aspm_support_enabled()) { 5328c33f51dSTaku Izumi flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | 5338c33f51dSTaku Izumi OSC_CLOCK_PWR_CAPABILITY_SUPPORT; 5348c33f51dSTaku Izumi } 5358c33f51dSTaku Izumi if (pci_msi_enabled()) 5368c33f51dSTaku Izumi flags |= OSC_MSI_SUPPORT; 5378c33f51dSTaku Izumi if (flags != base_flags) { 5388c33f51dSTaku Izumi status = acpi_pci_osc_support(root, flags); 5398c33f51dSTaku Izumi if (ACPI_FAILURE(status)) { 5408c33f51dSTaku Izumi dev_info(&device->dev, "ACPI _OSC support " 5418c33f51dSTaku Izumi "notification failed, disabling PCIe ASPM\n"); 5428c33f51dSTaku Izumi pcie_no_aspm(); 5438c33f51dSTaku Izumi flags = base_flags; 5448c33f51dSTaku Izumi } 5458c33f51dSTaku Izumi } 5468c33f51dSTaku Izumi if (!pcie_ports_disabled 5478c33f51dSTaku Izumi && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { 5488c33f51dSTaku Izumi flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL 5498c33f51dSTaku Izumi | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 5508c33f51dSTaku Izumi | OSC_PCI_EXPRESS_PME_CONTROL; 5518c33f51dSTaku Izumi 5528c33f51dSTaku Izumi if (pci_aer_available()) { 5538c33f51dSTaku Izumi if (aer_acpi_firmware_first()) 5548c33f51dSTaku Izumi dev_dbg(&device->dev, 5558c33f51dSTaku Izumi "PCIe errors handled by BIOS.\n"); 5568c33f51dSTaku Izumi else 5578c33f51dSTaku Izumi flags |= OSC_PCI_EXPRESS_AER_CONTROL; 5588c33f51dSTaku Izumi } 5598c33f51dSTaku Izumi 5608c33f51dSTaku Izumi dev_info(&device->dev, 5618c33f51dSTaku Izumi "Requesting ACPI _OSC control (0x%02x)\n", flags); 5628c33f51dSTaku Izumi 5638c33f51dSTaku Izumi status = acpi_pci_osc_control_set(device->handle, &flags, 5648c33f51dSTaku Izumi OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); 5658c33f51dSTaku Izumi if (ACPI_SUCCESS(status)) { 5668c33f51dSTaku Izumi is_osc_granted = true; 5678c33f51dSTaku Izumi dev_info(&device->dev, 5688c33f51dSTaku Izumi "ACPI _OSC control (0x%02x) granted\n", flags); 5698c33f51dSTaku Izumi } else { 5708c33f51dSTaku Izumi is_osc_granted = false; 5718c33f51dSTaku Izumi dev_info(&device->dev, 5728c33f51dSTaku Izumi "ACPI _OSC request failed (%s), " 5738c33f51dSTaku Izumi "returned control mask: 0x%02x\n", 5748c33f51dSTaku Izumi acpi_format_exception(status), flags); 5758c33f51dSTaku Izumi } 5768c33f51dSTaku Izumi } else { 5778c33f51dSTaku Izumi dev_info(&device->dev, 5788c33f51dSTaku Izumi "Unable to request _OSC control " 5798c33f51dSTaku Izumi "(_OSC support mask: 0x%02x)\n", flags); 5808c33f51dSTaku Izumi } 5818c33f51dSTaku Izumi 582990a7ac5SAndrew Patterson /* 5831da177e4SLinus Torvalds * TBD: Need PCI interface for enumeration/configuration of roots. 5841da177e4SLinus Torvalds */ 5851da177e4SLinus Torvalds 5866507e6ebSTaku Izumi mutex_lock(&acpi_pci_root_lock); 5871da177e4SLinus Torvalds list_add_tail(&root->node, &acpi_pci_roots); 5886507e6ebSTaku Izumi mutex_unlock(&acpi_pci_root_lock); 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds /* 5911da177e4SLinus Torvalds * Scan the Root Bridge 5921da177e4SLinus Torvalds * -------------------- 5931da177e4SLinus Torvalds * Must do this prior to any attempt to bind the root device, as the 5941da177e4SLinus Torvalds * PCI namespace does not get created until this call is made (and 5951da177e4SLinus Torvalds * thus the root bridge's pci_dev does not exist). 5961da177e4SLinus Torvalds */ 59757283776SBjorn Helgaas root->bus = pci_acpi_scan_root(root); 5981da177e4SLinus Torvalds if (!root->bus) { 5996468463aSLen Brown printk(KERN_ERR PREFIX 6006468463aSLen Brown "Bus %04x:%02x not present in PCI namespace\n", 6016ad95513SBjorn Helgaas root->segment, (unsigned int)root->secondary.start); 6021da177e4SLinus Torvalds result = -ENODEV; 6036507e6ebSTaku Izumi goto out_del_root; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* 6071da177e4SLinus Torvalds * Attach ACPI-PCI Context 6081da177e4SLinus Torvalds * ----------------------- 6091da177e4SLinus Torvalds * Thus binding the ACPI and PCI devices. 6101da177e4SLinus Torvalds */ 611499650deSAlexander Chiang result = acpi_pci_bind_root(device); 6121da177e4SLinus Torvalds if (result) 6136507e6ebSTaku Izumi goto out_del_root; 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* 6162786f6e3SRui Zhang * Scan and bind all _ADR-Based Devices 6172786f6e3SRui Zhang */ 6182786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 6192786f6e3SRui Zhang acpi_pci_bridge_scan(child); 6202786f6e3SRui Zhang 6218c33f51dSTaku Izumi /* ASPM setting */ 6228c33f51dSTaku Izumi if (is_osc_granted) { 6238c33f51dSTaku Izumi if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) 6243c076351SMatthew Garrett pcie_clear_aspm(root->bus); 625eca67315SNaga Chumbalkar } else { 626a246670dSRafael J. Wysocki pr_info("ACPI _OSC control for PCIe not granted, " 627a246670dSRafael J. Wysocki "disabling ASPM\n"); 628eca67315SNaga Chumbalkar pcie_no_aspm(); 629eca67315SNaga Chumbalkar } 630415e12b2SRafael J. Wysocki 631b67ea761SRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device, root->bus); 632b67ea761SRafael J. Wysocki if (device->wakeup.flags.run_wake) 633b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, true); 634b67ea761SRafael J. Wysocki 635f5eebbe1SBjorn Helgaas return 0; 636f5eebbe1SBjorn Helgaas 6376507e6ebSTaku Izumi out_del_root: 6386507e6ebSTaku Izumi mutex_lock(&acpi_pci_root_lock); 639c431ada4SRajesh Shah list_del(&root->node); 6406507e6ebSTaku Izumi mutex_unlock(&acpi_pci_root_lock); 641d4761ba2SBjorn Helgaas 642d4761ba2SBjorn Helgaas acpi_pci_irq_del_prt(root->segment, root->secondary.start); 6436507e6ebSTaku Izumi end: 6441da177e4SLinus Torvalds kfree(root); 645d550d98dSPatrick Mochel return result; 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds 6484be44fcdSLen Brown static int acpi_pci_root_start(struct acpi_device *device) 649c431ada4SRajesh Shah { 650caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 651c8e9afb1SJiang Liu struct acpi_pci_driver *driver; 652c8e9afb1SJiang Liu 6533c449ed0SYinghai Lu if (system_state != SYSTEM_BOOTING) { 6543c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 65562a08c5aSYinghai Lu pci_assign_unassigned_bus_resources(root->bus); 6563c449ed0SYinghai Lu } 65762a08c5aSYinghai Lu 658d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 659c8e9afb1SJiang Liu list_for_each_entry(driver, &acpi_pci_drivers, node) 660c8e9afb1SJiang Liu if (driver->add) 66155bfe3c0STaku Izumi driver->add(root); 662d0020f65STaku Izumi mutex_unlock(&acpi_pci_root_lock); 663c431ada4SRajesh Shah 66462a08c5aSYinghai Lu /* need to after hot-added ioapic is registered */ 66562a08c5aSYinghai Lu if (system_state != SYSTEM_BOOTING) 66662a08c5aSYinghai Lu pci_enable_bridges(root->bus); 66762a08c5aSYinghai Lu 668c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 669c8e9afb1SJiang Liu 670d550d98dSPatrick Mochel return 0; 671c431ada4SRajesh Shah } 6721da177e4SLinus Torvalds 6734be44fcdSLen Brown static int acpi_pci_root_remove(struct acpi_device *device, int type) 6741da177e4SLinus Torvalds { 67513b6a916SYinghai Lu acpi_status status; 67613b6a916SYinghai Lu acpi_handle handle; 677caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 678c8e9afb1SJiang Liu struct acpi_pci_driver *driver; 679c8e9afb1SJiang Liu 6809738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6819738a1fdSYinghai Lu 682d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 683f426cef3SYinghai Lu list_for_each_entry_reverse(driver, &acpi_pci_drivers, node) 684c8e9afb1SJiang Liu if (driver->remove) 68555bfe3c0STaku Izumi driver->remove(root); 6869738a1fdSYinghai Lu mutex_unlock(&acpi_pci_root_lock); 6871da177e4SLinus Torvalds 688b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, false); 689b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 690b67ea761SRafael J. Wysocki 69113b6a916SYinghai Lu status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); 69213b6a916SYinghai Lu if (ACPI_SUCCESS(status)) 69379c44122SBjorn Helgaas acpi_pci_irq_del_prt(root->segment, root->secondary.start); 69413b6a916SYinghai Lu 6959738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 6969738a1fdSYinghai Lu 6979738a1fdSYinghai Lu mutex_lock(&acpi_pci_root_lock); 6986507e6ebSTaku Izumi list_del(&root->node); 6996507e6ebSTaku Izumi mutex_unlock(&acpi_pci_root_lock); 7001da177e4SLinus Torvalds kfree(root); 701d550d98dSPatrick Mochel return 0; 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds static int __init acpi_pci_root_init(void) 7051da177e4SLinus Torvalds { 706d3072e6aSRafael J. Wysocki acpi_hest_init(); 707d3072e6aSRafael J. Wysocki 7081da177e4SLinus Torvalds if (acpi_pci_disabled) 709d550d98dSPatrick Mochel return 0; 7101da177e4SLinus Torvalds 7117bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 7121da177e4SLinus Torvalds if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 713d550d98dSPatrick Mochel return -ENODEV; 7141da177e4SLinus Torvalds 715d550d98dSPatrick Mochel return 0; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds subsys_initcall(acpi_pci_root_init); 719