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) { 902d1e0a02SPatrick Mochel driver->add(root->device->handle); 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) 1072d1e0a02SPatrick Mochel driver->remove(root->device->handle); 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; 115d91a0078SJustin Chen 116c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) 1176ad95513SBjorn Helgaas if ((root->segment == (u16) seg) && 1186ad95513SBjorn Helgaas (root->secondary.start == (u16) bus)) 119c1aec834SBjorn Helgaas return root->device->handle; 120d91a0078SJustin Chen return NULL; 121d91a0078SJustin Chen } 122d91a0078SJustin Chen 123d91a0078SJustin Chen EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); 124d91a0078SJustin Chen 12527558203SAlexander Chiang /** 12627558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 12727558203SAlexander Chiang * @handle - the ACPI CA node in question. 12827558203SAlexander Chiang * 12927558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 13027558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 13127558203SAlexander Chiang */ 13227558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 13327558203SAlexander Chiang { 13427558203SAlexander Chiang int ret; 13527558203SAlexander Chiang struct acpi_device *device; 13627558203SAlexander Chiang 13727558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 13827558203SAlexander Chiang if (ret) 13927558203SAlexander Chiang return 0; 14027558203SAlexander Chiang 14127558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 14227558203SAlexander Chiang if (ret) 14327558203SAlexander Chiang return 0; 14427558203SAlexander Chiang else 14527558203SAlexander Chiang return 1; 14627558203SAlexander Chiang } 14727558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 14827558203SAlexander Chiang 1491da177e4SLinus Torvalds static acpi_status 1501da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 1511da177e4SLinus Torvalds { 1526ad95513SBjorn Helgaas struct resource *res = data; 1531da177e4SLinus Torvalds struct acpi_resource_address64 address; 1541da177e4SLinus Torvalds 15550eca3ebSBob Moore if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 15650eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 15750eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 1581da177e4SLinus Torvalds return AE_OK; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds acpi_resource_to_address64(resource, &address); 1611da177e4SLinus Torvalds if ((address.address_length > 0) && 1626ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 1636ad95513SBjorn Helgaas res->start = address.minimum; 1646ad95513SBjorn Helgaas res->end = address.minimum + address.address_length - 1; 1656ad95513SBjorn Helgaas } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds return AE_OK; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 170f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1716ad95513SBjorn Helgaas struct resource *res) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds acpi_status status; 1741da177e4SLinus Torvalds 1756ad95513SBjorn Helgaas res->start = -1; 1764be44fcdSLen Brown status = 1774be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1786ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1791da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1801da177e4SLinus Torvalds return status; 1816ad95513SBjorn Helgaas if (res->start == -1) 1821da177e4SLinus Torvalds return AE_ERROR; 1831da177e4SLinus Torvalds return AE_OK; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1862786f6e3SRui Zhang static void acpi_pci_bridge_scan(struct acpi_device *device) 1872786f6e3SRui Zhang { 1882786f6e3SRui Zhang int status; 1892786f6e3SRui Zhang struct acpi_device *child = NULL; 1902786f6e3SRui Zhang 1912786f6e3SRui Zhang if (device->flags.bus_address) 1922786f6e3SRui Zhang if (device->parent && device->parent->ops.bind) { 1932786f6e3SRui Zhang status = device->parent->ops.bind(device); 1942786f6e3SRui Zhang if (!status) { 1952786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 1962786f6e3SRui Zhang acpi_pci_bridge_scan(child); 1972786f6e3SRui Zhang } 1982786f6e3SRui Zhang } 1992786f6e3SRui Zhang } 2002786f6e3SRui Zhang 2013a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 20263f10f0fSKenji Kaneshige 20363f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 20463f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 20563f10f0fSKenji Kaneshige { 2063a9622dcSShaohua Li struct acpi_osc_context context = { 2073a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 2083a9622dcSShaohua Li .rev = 1, 2093a9622dcSShaohua Li .cap.length = 12, 2103a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 2113a9622dcSShaohua Li }; 21263f10f0fSKenji Kaneshige acpi_status status; 21363f10f0fSKenji Kaneshige 2143a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 2153a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 2163a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 2173a9622dcSShaohua Li kfree(context.ret.pointer); 21863f10f0fSKenji Kaneshige } 21963f10f0fSKenji Kaneshige return status; 22063f10f0fSKenji Kaneshige } 22163f10f0fSKenji Kaneshige 222ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 223ab8e8957SRafael J. Wysocki u32 support, 224ab8e8957SRafael J. Wysocki u32 *control) 22563f10f0fSKenji Kaneshige { 22663f10f0fSKenji Kaneshige acpi_status status; 227ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 22863f10f0fSKenji Kaneshige 229ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 230ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 231ab8e8957SRafael J. Wysocki 23263f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 233ab8e8957SRafael J. Wysocki capbuf[OSC_SUPPORT_TYPE] = support; 234ab8e8957SRafael J. Wysocki if (control) { 235ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 236ab8e8957SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; 237ab8e8957SRafael J. Wysocki } else { 238ab8e8957SRafael J. Wysocki /* Run _OSC query for all possible controls. */ 2393a9622dcSShaohua Li capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS; 240ab8e8957SRafael J. Wysocki } 24163f10f0fSKenji Kaneshige 24263f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 24363f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 244ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2452b8fd918SRafael J. Wysocki if (control) 246ab8e8957SRafael J. Wysocki *control = result; 247ab8e8957SRafael J. Wysocki } 24863f10f0fSKenji Kaneshige return status; 24963f10f0fSKenji Kaneshige } 25063f10f0fSKenji Kaneshige 25163f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 25263f10f0fSKenji Kaneshige { 25363f10f0fSKenji Kaneshige acpi_status status; 25463f10f0fSKenji Kaneshige acpi_handle tmp; 25563f10f0fSKenji Kaneshige 25663f10f0fSKenji Kaneshige status = acpi_get_handle(root->device->handle, "_OSC", &tmp); 25763f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 25863f10f0fSKenji Kaneshige return status; 25963f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 260ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 26163f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 26263f10f0fSKenji Kaneshige return status; 26363f10f0fSKenji Kaneshige } 26463f10f0fSKenji Kaneshige 26576d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 26663f10f0fSKenji Kaneshige { 26763f10f0fSKenji Kaneshige struct acpi_pci_root *root; 268c1aec834SBjorn Helgaas 26963f10f0fSKenji Kaneshige list_for_each_entry(root, &acpi_pci_roots, node) { 27063f10f0fSKenji Kaneshige if (root->device->handle == handle) 27163f10f0fSKenji Kaneshige return root; 27263f10f0fSKenji Kaneshige } 27363f10f0fSKenji Kaneshige return NULL; 27463f10f0fSKenji Kaneshige } 27576d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 27663f10f0fSKenji Kaneshige 2772f7bbcebSAlexander Chiang struct acpi_handle_node { 2782f7bbcebSAlexander Chiang struct list_head node; 2792f7bbcebSAlexander Chiang acpi_handle handle; 2802f7bbcebSAlexander Chiang }; 2812f7bbcebSAlexander Chiang 2822f7bbcebSAlexander Chiang /** 2832f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2842f7bbcebSAlexander Chiang * @handle: the handle in question 2852f7bbcebSAlexander Chiang * 2862f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2872f7bbcebSAlexander Chiang * list of PCI devices. 2882f7bbcebSAlexander Chiang * 2892f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2902f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2912f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2922f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2932f7bbcebSAlexander Chiang */ 2942f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2952f7bbcebSAlexander Chiang { 2962f7bbcebSAlexander Chiang int dev, fn; 2972f7bbcebSAlexander Chiang unsigned long long adr; 2982f7bbcebSAlexander Chiang acpi_status status; 2992f7bbcebSAlexander Chiang acpi_handle phandle; 3002f7bbcebSAlexander Chiang struct pci_bus *pbus; 3012f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 3022f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 3032f7bbcebSAlexander Chiang struct acpi_pci_root *root; 3042f7bbcebSAlexander Chiang LIST_HEAD(device_list); 3052f7bbcebSAlexander Chiang 3062f7bbcebSAlexander Chiang /* 3072f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 3082f7bbcebSAlexander Chiang */ 3092f7bbcebSAlexander Chiang phandle = handle; 3102f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 3112f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 3122f7bbcebSAlexander Chiang if (!node) 3132f7bbcebSAlexander Chiang goto out; 3142f7bbcebSAlexander Chiang 3152f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 3162f7bbcebSAlexander Chiang node->handle = phandle; 3172f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 3182f7bbcebSAlexander Chiang 3192f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 3202f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3212f7bbcebSAlexander Chiang goto out; 3222f7bbcebSAlexander Chiang } 3232f7bbcebSAlexander Chiang 3242f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 3252f7bbcebSAlexander Chiang if (!root) 3262f7bbcebSAlexander Chiang goto out; 3272f7bbcebSAlexander Chiang 3282f7bbcebSAlexander Chiang pbus = root->bus; 3292f7bbcebSAlexander Chiang 3302f7bbcebSAlexander Chiang /* 3312f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3322f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3332f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3342f7bbcebSAlexander Chiang */ 3352f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3362f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3372f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3382f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3392f7bbcebSAlexander Chiang goto out; 3402f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3412f7bbcebSAlexander Chiang fn = adr & 0xffff; 3422f7bbcebSAlexander Chiang 3432f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 344412af978STroy Moure if (!pdev || hnd == handle) 3452f7bbcebSAlexander Chiang break; 3462f7bbcebSAlexander Chiang 3472f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3482f7bbcebSAlexander Chiang pci_dev_put(pdev); 349497fb54fSRafael J. Wysocki 350497fb54fSRafael J. Wysocki /* 351497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 352497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 353497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 354497fb54fSRafael J. Wysocki */ 355497fb54fSRafael J. Wysocki if (!pbus) { 356497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 357497fb54fSRafael J. Wysocki pdev = NULL; 358497fb54fSRafael J. Wysocki break; 359497fb54fSRafael J. Wysocki } 3602f7bbcebSAlexander Chiang } 3612f7bbcebSAlexander Chiang out: 3622f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3632f7bbcebSAlexander Chiang kfree(node); 3642f7bbcebSAlexander Chiang 3652f7bbcebSAlexander Chiang return pdev; 3662f7bbcebSAlexander Chiang } 3672f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3682f7bbcebSAlexander Chiang 36963f10f0fSKenji Kaneshige /** 37075fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 37175fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 37275fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 37375fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 37463f10f0fSKenji Kaneshige * 37575fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 37675fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 37775fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 37875fb60f2SRafael J. Wysocki * 37975fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 38075fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 38175fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 38275fb60f2SRafael J. Wysocki * on failure. 38363f10f0fSKenji Kaneshige **/ 38475fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 38563f10f0fSKenji Kaneshige { 38663f10f0fSKenji Kaneshige struct acpi_pci_root *root; 38775fb60f2SRafael J. Wysocki acpi_status status; 38875fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 38975fb60f2SRafael J. Wysocki acpi_handle tmp; 39063f10f0fSKenji Kaneshige 39175fb60f2SRafael J. Wysocki if (!mask) 39275fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 39375fb60f2SRafael J. Wysocki 39475fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 39575fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 39663f10f0fSKenji Kaneshige return AE_TYPE; 39763f10f0fSKenji Kaneshige 39863f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 39963f10f0fSKenji Kaneshige if (!root) 40063f10f0fSKenji Kaneshige return AE_NOT_EXIST; 40163f10f0fSKenji Kaneshige 402b879dc4bSRafael J. Wysocki status = acpi_get_handle(handle, "_OSC", &tmp); 403b879dc4bSRafael J. Wysocki if (ACPI_FAILURE(status)) 404b879dc4bSRafael J. Wysocki return status; 405b879dc4bSRafael J. Wysocki 40663f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 40775fb60f2SRafael J. Wysocki 40875fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 40963f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 41075fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 41163f10f0fSKenji Kaneshige goto out; 41263f10f0fSKenji Kaneshige 41375fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 41475fb60f2SRafael J. Wysocki while (*mask) { 41575fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 41663f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 41763f10f0fSKenji Kaneshige goto out; 41875fb60f2SRafael J. Wysocki if (ctrl == *mask) 41975fb60f2SRafael J. Wysocki break; 42075fb60f2SRafael J. Wysocki ctrl = *mask; 42175fb60f2SRafael J. Wysocki } 4222b8fd918SRafael J. Wysocki 42375fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 42463f10f0fSKenji Kaneshige status = AE_SUPPORT; 42563f10f0fSKenji Kaneshige goto out; 42663f10f0fSKenji Kaneshige } 42763f10f0fSKenji Kaneshige 42863f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = 0; 42963f10f0fSKenji Kaneshige capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; 43075fb60f2SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = ctrl; 43175fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 43263f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 43375fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 43463f10f0fSKenji Kaneshige out: 43563f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 43663f10f0fSKenji Kaneshige return status; 43763f10f0fSKenji Kaneshige } 4389f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 43963f10f0fSKenji Kaneshige 440b5678a34SSam Ravnborg static int __devinit acpi_pci_root_add(struct acpi_device *device) 4411da177e4SLinus Torvalds { 442f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 443f5eebbe1SBjorn Helgaas acpi_status status; 444f5eebbe1SBjorn Helgaas int result; 445f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 446f5eebbe1SBjorn Helgaas acpi_handle handle; 4472786f6e3SRui Zhang struct acpi_device *child; 4480ef5f8f6SAndrew Patterson u32 flags, base_flags; 4491da177e4SLinus Torvalds 4506ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 4516ad95513SBjorn Helgaas if (!root) 4526ad95513SBjorn Helgaas return -ENOMEM; 4536ad95513SBjorn Helgaas 454f5eebbe1SBjorn Helgaas segment = 0; 455f5eebbe1SBjorn Helgaas status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, 456f5eebbe1SBjorn Helgaas &segment); 457f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 458f5eebbe1SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); 4596ad95513SBjorn Helgaas result = -ENODEV; 4606ad95513SBjorn Helgaas goto end; 461f5eebbe1SBjorn Helgaas } 4621da177e4SLinus Torvalds 463f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 4646ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 4656ad95513SBjorn Helgaas status = try_get_root_bridge_busnr(device->handle, &root->secondary); 466f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 4676ad95513SBjorn Helgaas /* 4686ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 4696ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 4706ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 4716ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 4726ad95513SBjorn Helgaas */ 4736ad95513SBjorn Helgaas root->secondary.end = 0xFF; 4746ad95513SBjorn Helgaas printk(KERN_WARNING FW_BUG PREFIX 4756ad95513SBjorn Helgaas "no secondary bus range in _CRS\n"); 476e545b55aSJon Mason status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, 477e545b55aSJon Mason NULL, &bus); 4786ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 4796ad95513SBjorn Helgaas root->secondary.start = bus; 4806ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 4816ad95513SBjorn Helgaas root->secondary.start = 0; 4826ad95513SBjorn Helgaas else { 4836ad95513SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); 4846ad95513SBjorn Helgaas result = -ENODEV; 4856ad95513SBjorn Helgaas goto end; 486f5eebbe1SBjorn Helgaas } 487f5eebbe1SBjorn Helgaas } 4881da177e4SLinus Torvalds 489f5eebbe1SBjorn Helgaas INIT_LIST_HEAD(&root->node); 49032917e5bSPatrick Mochel root->device = device; 4910705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 4921da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 4931da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 494db89b4f0SPavel Machek device->driver_data = root; 4951da177e4SLinus Torvalds 496f4b57a3bSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle); 497f4b57a3bSJiang Liu 4981da177e4SLinus Torvalds /* 499990a7ac5SAndrew Patterson * All supported architectures that use ACPI have support for 500990a7ac5SAndrew Patterson * PCI domains, so we indicate this in _OSC support capabilities. 501990a7ac5SAndrew Patterson */ 5020ef5f8f6SAndrew Patterson flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 50363f10f0fSKenji Kaneshige acpi_pci_osc_support(root, flags); 504990a7ac5SAndrew Patterson 505990a7ac5SAndrew Patterson /* 5061da177e4SLinus Torvalds * TBD: Need PCI interface for enumeration/configuration of roots. 5071da177e4SLinus Torvalds */ 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds /* TBD: Locking */ 5101da177e4SLinus Torvalds list_add_tail(&root->node, &acpi_pci_roots); 5111da177e4SLinus Torvalds 5126ad95513SBjorn Helgaas printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", 5131da177e4SLinus Torvalds acpi_device_name(device), acpi_device_bid(device), 5146ad95513SBjorn Helgaas root->segment, &root->secondary); 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* 5171da177e4SLinus Torvalds * Scan the Root Bridge 5181da177e4SLinus Torvalds * -------------------- 5191da177e4SLinus Torvalds * Must do this prior to any attempt to bind the root device, as the 5201da177e4SLinus Torvalds * PCI namespace does not get created until this call is made (and 5211da177e4SLinus Torvalds * thus the root bridge's pci_dev does not exist). 5221da177e4SLinus Torvalds */ 52357283776SBjorn Helgaas root->bus = pci_acpi_scan_root(root); 5241da177e4SLinus Torvalds if (!root->bus) { 5256468463aSLen Brown printk(KERN_ERR PREFIX 5266468463aSLen Brown "Bus %04x:%02x not present in PCI namespace\n", 5276ad95513SBjorn Helgaas root->segment, (unsigned int)root->secondary.start); 5281da177e4SLinus Torvalds result = -ENODEV; 5291da177e4SLinus Torvalds goto end; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds /* 5331da177e4SLinus Torvalds * Attach ACPI-PCI Context 5341da177e4SLinus Torvalds * ----------------------- 5351da177e4SLinus Torvalds * Thus binding the ACPI and PCI devices. 5361da177e4SLinus Torvalds */ 537499650deSAlexander Chiang result = acpi_pci_bind_root(device); 5381da177e4SLinus Torvalds if (result) 5391da177e4SLinus Torvalds goto end; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* 5421da177e4SLinus Torvalds * PCI Routing Table 5431da177e4SLinus Torvalds * ----------------- 5441da177e4SLinus Torvalds * Evaluate and parse _PRT, if exists. 5451da177e4SLinus Torvalds */ 5462d1e0a02SPatrick Mochel status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); 5471da177e4SLinus Torvalds if (ACPI_SUCCESS(status)) 548859a3f86SAlexander Chiang result = acpi_pci_irq_add_prt(device->handle, root->bus); 5491da177e4SLinus Torvalds 5502786f6e3SRui Zhang /* 5512786f6e3SRui Zhang * Scan and bind all _ADR-Based Devices 5522786f6e3SRui Zhang */ 5532786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 5542786f6e3SRui Zhang acpi_pci_bridge_scan(child); 5552786f6e3SRui Zhang 5560ef5f8f6SAndrew Patterson /* Indicate support for various _OSC capabilities. */ 5570ef5f8f6SAndrew Patterson if (pci_ext_cfg_avail(root->bus->self)) 5580ef5f8f6SAndrew Patterson flags |= OSC_EXT_PCI_CONFIG_SUPPORT; 5598b8bae90SRafael J. Wysocki if (pcie_aspm_support_enabled()) 5603e1b1600SAndrew Patterson flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | 5613e1b1600SAndrew Patterson OSC_CLOCK_PWR_CAPABILITY_SUPPORT; 56207ae95f9SAndrew Patterson if (pci_msi_enabled()) 56307ae95f9SAndrew Patterson flags |= OSC_MSI_SUPPORT; 5640ef5f8f6SAndrew Patterson if (flags != base_flags) 56563f10f0fSKenji Kaneshige acpi_pci_osc_support(root, flags); 5660ef5f8f6SAndrew Patterson 567415e12b2SRafael J. Wysocki if (!pcie_ports_disabled 568415e12b2SRafael J. Wysocki && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { 569415e12b2SRafael J. Wysocki flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL 570415e12b2SRafael J. Wysocki | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 571415e12b2SRafael J. Wysocki | OSC_PCI_EXPRESS_PME_CONTROL; 572415e12b2SRafael J. Wysocki 573415e12b2SRafael J. Wysocki if (pci_aer_available()) { 574415e12b2SRafael J. Wysocki if (aer_acpi_firmware_first()) 575415e12b2SRafael J. Wysocki dev_dbg(root->bus->bridge, 576415e12b2SRafael J. Wysocki "PCIe errors handled by BIOS.\n"); 577415e12b2SRafael J. Wysocki else 578415e12b2SRafael J. Wysocki flags |= OSC_PCI_EXPRESS_AER_CONTROL; 579415e12b2SRafael J. Wysocki } 580415e12b2SRafael J. Wysocki 581415e12b2SRafael J. Wysocki dev_info(root->bus->bridge, 582415e12b2SRafael J. Wysocki "Requesting ACPI _OSC control (0x%02x)\n", flags); 583415e12b2SRafael J. Wysocki 584415e12b2SRafael J. Wysocki status = acpi_pci_osc_control_set(device->handle, &flags, 585415e12b2SRafael J. Wysocki OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); 586eca67315SNaga Chumbalkar if (ACPI_SUCCESS(status)) { 587415e12b2SRafael J. Wysocki dev_info(root->bus->bridge, 588415e12b2SRafael J. Wysocki "ACPI _OSC control (0x%02x) granted\n", flags); 5893c076351SMatthew Garrett if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 5903c076351SMatthew Garrett /* 5913c076351SMatthew Garrett * We have ASPM control, but the FADT indicates 5923c076351SMatthew Garrett * that it's unsupported. Clear it. 5933c076351SMatthew Garrett */ 5943c076351SMatthew Garrett pcie_clear_aspm(root->bus); 5953c076351SMatthew Garrett } 596eca67315SNaga Chumbalkar } else { 597a246670dSRafael J. Wysocki dev_info(root->bus->bridge, 598a246670dSRafael J. Wysocki "ACPI _OSC request failed (%s), " 599a246670dSRafael J. Wysocki "returned control mask: 0x%02x\n", 600a246670dSRafael J. Wysocki acpi_format_exception(status), flags); 601a246670dSRafael J. Wysocki pr_info("ACPI _OSC control for PCIe not granted, " 602a246670dSRafael J. Wysocki "disabling ASPM\n"); 603eca67315SNaga Chumbalkar pcie_no_aspm(); 604eca67315SNaga Chumbalkar } 605a246670dSRafael J. Wysocki } else { 606a246670dSRafael J. Wysocki dev_info(root->bus->bridge, 607a246670dSRafael J. Wysocki "Unable to request _OSC control " 608a246670dSRafael J. Wysocki "(_OSC support mask: 0x%02x)\n", flags); 609415e12b2SRafael J. Wysocki } 610415e12b2SRafael J. Wysocki 611b67ea761SRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device, root->bus); 612b67ea761SRafael J. Wysocki if (device->wakeup.flags.run_wake) 613b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, true); 614b67ea761SRafael J. Wysocki 615f5eebbe1SBjorn Helgaas return 0; 616f5eebbe1SBjorn Helgaas 6171da177e4SLinus Torvalds end: 618c431ada4SRajesh Shah if (!list_empty(&root->node)) 619c431ada4SRajesh Shah list_del(&root->node); 6201da177e4SLinus Torvalds kfree(root); 621d550d98dSPatrick Mochel return result; 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds 6244be44fcdSLen Brown static int acpi_pci_root_start(struct acpi_device *device) 625c431ada4SRajesh Shah { 626caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 627c8e9afb1SJiang Liu struct acpi_pci_driver *driver; 628c8e9afb1SJiang Liu 629d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 630c8e9afb1SJiang Liu list_for_each_entry(driver, &acpi_pci_drivers, node) 631c8e9afb1SJiang Liu if (driver->add) 632c8e9afb1SJiang Liu driver->add(device->handle); 633d0020f65STaku Izumi mutex_unlock(&acpi_pci_root_lock); 634c431ada4SRajesh Shah 635c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 636c8e9afb1SJiang Liu 637d550d98dSPatrick Mochel return 0; 638c431ada4SRajesh Shah } 6391da177e4SLinus Torvalds 6404be44fcdSLen Brown static int acpi_pci_root_remove(struct acpi_device *device, int type) 6411da177e4SLinus Torvalds { 642caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 643c8e9afb1SJiang Liu struct acpi_pci_driver *driver; 644c8e9afb1SJiang Liu 645d0020f65STaku Izumi mutex_lock(&acpi_pci_root_lock); 646c8e9afb1SJiang Liu list_for_each_entry(driver, &acpi_pci_drivers, node) 647c8e9afb1SJiang Liu if (driver->remove) 648c8e9afb1SJiang Liu driver->remove(root->device->handle); 649d0020f65STaku Izumi mutex_unlock(&acpi_pci_root_lock); 6501da177e4SLinus Torvalds 651b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, false); 652b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 653b67ea761SRafael J. Wysocki 6541da177e4SLinus Torvalds kfree(root); 655d550d98dSPatrick Mochel return 0; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds static int __init acpi_pci_root_init(void) 6591da177e4SLinus Torvalds { 660d3072e6aSRafael J. Wysocki acpi_hest_init(); 661d3072e6aSRafael J. Wysocki 6621da177e4SLinus Torvalds if (acpi_pci_disabled) 663d550d98dSPatrick Mochel return 0; 6641da177e4SLinus Torvalds 6657bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 6661da177e4SLinus Torvalds if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 667d550d98dSPatrick Mochel return -ENODEV; 6681da177e4SLinus Torvalds 669d550d98dSPatrick Mochel return 0; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds subsys_initcall(acpi_pci_root_init); 673