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> 301da177e4SLinus Torvalds #include <linux/spinlock.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 741da177e4SLinus Torvalds static LIST_HEAD(acpi_pci_roots); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds static struct acpi_pci_driver *sub_driver; 7763f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds int acpi_pci_register_driver(struct acpi_pci_driver *driver) 801da177e4SLinus Torvalds { 811da177e4SLinus Torvalds int n = 0; 82c1aec834SBjorn Helgaas struct acpi_pci_root *root; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds struct acpi_pci_driver **pptr = &sub_driver; 851da177e4SLinus Torvalds while (*pptr) 861da177e4SLinus Torvalds pptr = &(*pptr)->next; 871da177e4SLinus Torvalds *pptr = driver; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds if (!driver->add) 901da177e4SLinus Torvalds return 0; 911da177e4SLinus Torvalds 92c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) { 932d1e0a02SPatrick Mochel driver->add(root->device->handle); 941da177e4SLinus Torvalds n++; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds return n; 981da177e4SLinus Torvalds } 994be44fcdSLen Brown 1001da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_register_driver); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 1031da177e4SLinus Torvalds { 104c1aec834SBjorn Helgaas struct acpi_pci_root *root; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds struct acpi_pci_driver **pptr = &sub_driver; 1071da177e4SLinus Torvalds while (*pptr) { 108f10bb254SAkinobu Mita if (*pptr == driver) 1091da177e4SLinus Torvalds break; 110f10bb254SAkinobu Mita pptr = &(*pptr)->next; 1111da177e4SLinus Torvalds } 112f10bb254SAkinobu Mita BUG_ON(!*pptr); 113f10bb254SAkinobu Mita *pptr = (*pptr)->next; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds if (!driver->remove) 1161da177e4SLinus Torvalds return; 1171da177e4SLinus Torvalds 118c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) 1192d1e0a02SPatrick Mochel driver->remove(root->device->handle); 1201da177e4SLinus Torvalds } 1214be44fcdSLen Brown 1221da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_unregister_driver); 1231da177e4SLinus Torvalds 124d91a0078SJustin Chen acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) 125d91a0078SJustin Chen { 126c1aec834SBjorn Helgaas struct acpi_pci_root *root; 127d91a0078SJustin Chen 128c1aec834SBjorn Helgaas list_for_each_entry(root, &acpi_pci_roots, node) 1296ad95513SBjorn Helgaas if ((root->segment == (u16) seg) && 1306ad95513SBjorn Helgaas (root->secondary.start == (u16) bus)) 131c1aec834SBjorn Helgaas return root->device->handle; 132d91a0078SJustin Chen return NULL; 133d91a0078SJustin Chen } 134d91a0078SJustin Chen 135d91a0078SJustin Chen EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); 136d91a0078SJustin Chen 13727558203SAlexander Chiang /** 13827558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 13927558203SAlexander Chiang * @handle - the ACPI CA node in question. 14027558203SAlexander Chiang * 14127558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 14227558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 14327558203SAlexander Chiang */ 14427558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 14527558203SAlexander Chiang { 14627558203SAlexander Chiang int ret; 14727558203SAlexander Chiang struct acpi_device *device; 14827558203SAlexander Chiang 14927558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 15027558203SAlexander Chiang if (ret) 15127558203SAlexander Chiang return 0; 15227558203SAlexander Chiang 15327558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 15427558203SAlexander Chiang if (ret) 15527558203SAlexander Chiang return 0; 15627558203SAlexander Chiang else 15727558203SAlexander Chiang return 1; 15827558203SAlexander Chiang } 15927558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 16027558203SAlexander Chiang 1611da177e4SLinus Torvalds static acpi_status 1621da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 1631da177e4SLinus Torvalds { 1646ad95513SBjorn Helgaas struct resource *res = data; 1651da177e4SLinus Torvalds struct acpi_resource_address64 address; 1661da177e4SLinus Torvalds 16750eca3ebSBob Moore if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && 16850eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && 16950eca3ebSBob Moore resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) 1701da177e4SLinus Torvalds return AE_OK; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds acpi_resource_to_address64(resource, &address); 1731da177e4SLinus Torvalds if ((address.address_length > 0) && 1746ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 1756ad95513SBjorn Helgaas res->start = address.minimum; 1766ad95513SBjorn Helgaas res->end = address.minimum + address.address_length - 1; 1776ad95513SBjorn Helgaas } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds return AE_OK; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 182f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1836ad95513SBjorn Helgaas struct resource *res) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds acpi_status status; 1861da177e4SLinus Torvalds 1876ad95513SBjorn Helgaas res->start = -1; 1884be44fcdSLen Brown status = 1894be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1906ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1911da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1921da177e4SLinus Torvalds return status; 1936ad95513SBjorn Helgaas if (res->start == -1) 1941da177e4SLinus Torvalds return AE_ERROR; 1951da177e4SLinus Torvalds return AE_OK; 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 1982786f6e3SRui Zhang static void acpi_pci_bridge_scan(struct acpi_device *device) 1992786f6e3SRui Zhang { 2002786f6e3SRui Zhang int status; 2012786f6e3SRui Zhang struct acpi_device *child = NULL; 2022786f6e3SRui Zhang 2032786f6e3SRui Zhang if (device->flags.bus_address) 2042786f6e3SRui Zhang if (device->parent && device->parent->ops.bind) { 2052786f6e3SRui Zhang status = device->parent->ops.bind(device); 2062786f6e3SRui Zhang if (!status) { 2072786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 2082786f6e3SRui Zhang acpi_pci_bridge_scan(child); 2092786f6e3SRui Zhang } 2102786f6e3SRui Zhang } 2112786f6e3SRui Zhang } 2122786f6e3SRui Zhang 2133a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 21463f10f0fSKenji Kaneshige 21563f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 21663f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 21763f10f0fSKenji Kaneshige { 2183a9622dcSShaohua Li struct acpi_osc_context context = { 2193a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 2203a9622dcSShaohua Li .rev = 1, 2213a9622dcSShaohua Li .cap.length = 12, 2223a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 2233a9622dcSShaohua Li }; 22463f10f0fSKenji Kaneshige acpi_status status; 22563f10f0fSKenji Kaneshige 2263a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 2273a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 2283a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 2293a9622dcSShaohua Li kfree(context.ret.pointer); 23063f10f0fSKenji Kaneshige } 23163f10f0fSKenji Kaneshige return status; 23263f10f0fSKenji Kaneshige } 23363f10f0fSKenji Kaneshige 234ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 235ab8e8957SRafael J. Wysocki u32 support, 236ab8e8957SRafael J. Wysocki u32 *control) 23763f10f0fSKenji Kaneshige { 23863f10f0fSKenji Kaneshige acpi_status status; 239ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 24063f10f0fSKenji Kaneshige 241ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 242ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 243ab8e8957SRafael J. Wysocki 24463f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 245ab8e8957SRafael J. Wysocki capbuf[OSC_SUPPORT_TYPE] = support; 246ab8e8957SRafael J. Wysocki if (control) { 247ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 248ab8e8957SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; 249ab8e8957SRafael J. Wysocki } else { 250ab8e8957SRafael J. Wysocki /* Run _OSC query for all possible controls. */ 2513a9622dcSShaohua Li capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS; 252ab8e8957SRafael J. Wysocki } 25363f10f0fSKenji Kaneshige 25463f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 25563f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 256ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2572b8fd918SRafael J. Wysocki if (control) 258ab8e8957SRafael J. Wysocki *control = result; 259ab8e8957SRafael J. Wysocki } 26063f10f0fSKenji Kaneshige return status; 26163f10f0fSKenji Kaneshige } 26263f10f0fSKenji Kaneshige 26363f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 26463f10f0fSKenji Kaneshige { 26563f10f0fSKenji Kaneshige acpi_status status; 26663f10f0fSKenji Kaneshige acpi_handle tmp; 26763f10f0fSKenji Kaneshige 26863f10f0fSKenji Kaneshige status = acpi_get_handle(root->device->handle, "_OSC", &tmp); 26963f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 27063f10f0fSKenji Kaneshige return status; 27163f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 272ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 27363f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 27463f10f0fSKenji Kaneshige return status; 27563f10f0fSKenji Kaneshige } 27663f10f0fSKenji Kaneshige 27776d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 27863f10f0fSKenji Kaneshige { 27963f10f0fSKenji Kaneshige struct acpi_pci_root *root; 280c1aec834SBjorn Helgaas 28163f10f0fSKenji Kaneshige list_for_each_entry(root, &acpi_pci_roots, node) { 28263f10f0fSKenji Kaneshige if (root->device->handle == handle) 28363f10f0fSKenji Kaneshige return root; 28463f10f0fSKenji Kaneshige } 28563f10f0fSKenji Kaneshige return NULL; 28663f10f0fSKenji Kaneshige } 28776d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 28863f10f0fSKenji Kaneshige 2892f7bbcebSAlexander Chiang struct acpi_handle_node { 2902f7bbcebSAlexander Chiang struct list_head node; 2912f7bbcebSAlexander Chiang acpi_handle handle; 2922f7bbcebSAlexander Chiang }; 2932f7bbcebSAlexander Chiang 2942f7bbcebSAlexander Chiang /** 2952f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2962f7bbcebSAlexander Chiang * @handle: the handle in question 2972f7bbcebSAlexander Chiang * 2982f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2992f7bbcebSAlexander Chiang * list of PCI devices. 3002f7bbcebSAlexander Chiang * 3012f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 3022f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 3032f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 3042f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 3052f7bbcebSAlexander Chiang */ 3062f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 3072f7bbcebSAlexander Chiang { 3082f7bbcebSAlexander Chiang int dev, fn; 3092f7bbcebSAlexander Chiang unsigned long long adr; 3102f7bbcebSAlexander Chiang acpi_status status; 3112f7bbcebSAlexander Chiang acpi_handle phandle; 3122f7bbcebSAlexander Chiang struct pci_bus *pbus; 3132f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 3142f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 3152f7bbcebSAlexander Chiang struct acpi_pci_root *root; 3162f7bbcebSAlexander Chiang LIST_HEAD(device_list); 3172f7bbcebSAlexander Chiang 3182f7bbcebSAlexander Chiang /* 3192f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 3202f7bbcebSAlexander Chiang */ 3212f7bbcebSAlexander Chiang phandle = handle; 3222f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 3232f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 3242f7bbcebSAlexander Chiang if (!node) 3252f7bbcebSAlexander Chiang goto out; 3262f7bbcebSAlexander Chiang 3272f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 3282f7bbcebSAlexander Chiang node->handle = phandle; 3292f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 3302f7bbcebSAlexander Chiang 3312f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 3322f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3332f7bbcebSAlexander Chiang goto out; 3342f7bbcebSAlexander Chiang } 3352f7bbcebSAlexander Chiang 3362f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 3372f7bbcebSAlexander Chiang if (!root) 3382f7bbcebSAlexander Chiang goto out; 3392f7bbcebSAlexander Chiang 3402f7bbcebSAlexander Chiang pbus = root->bus; 3412f7bbcebSAlexander Chiang 3422f7bbcebSAlexander Chiang /* 3432f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3442f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3452f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3462f7bbcebSAlexander Chiang */ 3472f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3482f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3492f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3502f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3512f7bbcebSAlexander Chiang goto out; 3522f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3532f7bbcebSAlexander Chiang fn = adr & 0xffff; 3542f7bbcebSAlexander Chiang 3552f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 356412af978STroy Moure if (!pdev || hnd == handle) 3572f7bbcebSAlexander Chiang break; 3582f7bbcebSAlexander Chiang 3592f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3602f7bbcebSAlexander Chiang pci_dev_put(pdev); 361497fb54fSRafael J. Wysocki 362497fb54fSRafael J. Wysocki /* 363497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 364497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 365497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 366497fb54fSRafael J. Wysocki */ 367497fb54fSRafael J. Wysocki if (!pbus) { 368497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 369497fb54fSRafael J. Wysocki pdev = NULL; 370497fb54fSRafael J. Wysocki break; 371497fb54fSRafael J. Wysocki } 3722f7bbcebSAlexander Chiang } 3732f7bbcebSAlexander Chiang out: 3742f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3752f7bbcebSAlexander Chiang kfree(node); 3762f7bbcebSAlexander Chiang 3772f7bbcebSAlexander Chiang return pdev; 3782f7bbcebSAlexander Chiang } 3792f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3802f7bbcebSAlexander Chiang 38163f10f0fSKenji Kaneshige /** 38275fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 38375fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 38475fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 38575fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 38663f10f0fSKenji Kaneshige * 38775fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 38875fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 38975fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 39075fb60f2SRafael J. Wysocki * 39175fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 39275fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 39375fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 39475fb60f2SRafael J. Wysocki * on failure. 39563f10f0fSKenji Kaneshige **/ 39675fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 39763f10f0fSKenji Kaneshige { 39863f10f0fSKenji Kaneshige struct acpi_pci_root *root; 39975fb60f2SRafael J. Wysocki acpi_status status; 40075fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 40175fb60f2SRafael J. Wysocki acpi_handle tmp; 40263f10f0fSKenji Kaneshige 40375fb60f2SRafael J. Wysocki if (!mask) 40475fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 40575fb60f2SRafael J. Wysocki 40675fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 40775fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 40863f10f0fSKenji Kaneshige return AE_TYPE; 40963f10f0fSKenji Kaneshige 41063f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 41163f10f0fSKenji Kaneshige if (!root) 41263f10f0fSKenji Kaneshige return AE_NOT_EXIST; 41363f10f0fSKenji Kaneshige 414b879dc4bSRafael J. Wysocki status = acpi_get_handle(handle, "_OSC", &tmp); 415b879dc4bSRafael J. Wysocki if (ACPI_FAILURE(status)) 416b879dc4bSRafael J. Wysocki return status; 417b879dc4bSRafael J. Wysocki 41863f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 41975fb60f2SRafael J. Wysocki 42075fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 42163f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 42275fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 42363f10f0fSKenji Kaneshige goto out; 42463f10f0fSKenji Kaneshige 42575fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 42675fb60f2SRafael J. Wysocki while (*mask) { 42775fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 42863f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 42963f10f0fSKenji Kaneshige goto out; 43075fb60f2SRafael J. Wysocki if (ctrl == *mask) 43175fb60f2SRafael J. Wysocki break; 43275fb60f2SRafael J. Wysocki ctrl = *mask; 43375fb60f2SRafael J. Wysocki } 4342b8fd918SRafael J. Wysocki 43575fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 43663f10f0fSKenji Kaneshige status = AE_SUPPORT; 43763f10f0fSKenji Kaneshige goto out; 43863f10f0fSKenji Kaneshige } 43963f10f0fSKenji Kaneshige 44063f10f0fSKenji Kaneshige capbuf[OSC_QUERY_TYPE] = 0; 44163f10f0fSKenji Kaneshige capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; 44275fb60f2SRafael J. Wysocki capbuf[OSC_CONTROL_TYPE] = ctrl; 44375fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 44463f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 44575fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 44663f10f0fSKenji Kaneshige out: 44763f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 44863f10f0fSKenji Kaneshige return status; 44963f10f0fSKenji Kaneshige } 4509f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 45163f10f0fSKenji Kaneshige 452b5678a34SSam Ravnborg static int __devinit acpi_pci_root_add(struct acpi_device *device) 4531da177e4SLinus Torvalds { 454f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 455f5eebbe1SBjorn Helgaas acpi_status status; 456f5eebbe1SBjorn Helgaas int result; 457f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 458f5eebbe1SBjorn Helgaas acpi_handle handle; 4592786f6e3SRui Zhang struct acpi_device *child; 4600ef5f8f6SAndrew Patterson u32 flags, base_flags; 4611da177e4SLinus Torvalds 4626ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 4636ad95513SBjorn Helgaas if (!root) 4646ad95513SBjorn Helgaas return -ENOMEM; 4656ad95513SBjorn Helgaas 466f5eebbe1SBjorn Helgaas segment = 0; 467f5eebbe1SBjorn Helgaas status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, 468f5eebbe1SBjorn Helgaas &segment); 469f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 470f5eebbe1SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); 4716ad95513SBjorn Helgaas result = -ENODEV; 4726ad95513SBjorn Helgaas goto end; 473f5eebbe1SBjorn Helgaas } 4741da177e4SLinus Torvalds 475f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 4766ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 4776ad95513SBjorn Helgaas status = try_get_root_bridge_busnr(device->handle, &root->secondary); 478f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 4796ad95513SBjorn Helgaas /* 4806ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 4816ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 4826ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 4836ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 4846ad95513SBjorn Helgaas */ 4856ad95513SBjorn Helgaas root->secondary.end = 0xFF; 4866ad95513SBjorn Helgaas printk(KERN_WARNING FW_BUG PREFIX 4876ad95513SBjorn Helgaas "no secondary bus range in _CRS\n"); 488e545b55aSJon Mason status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, 489e545b55aSJon Mason NULL, &bus); 4906ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 4916ad95513SBjorn Helgaas root->secondary.start = bus; 4926ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 4936ad95513SBjorn Helgaas root->secondary.start = 0; 4946ad95513SBjorn Helgaas else { 4956ad95513SBjorn Helgaas printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); 4966ad95513SBjorn Helgaas result = -ENODEV; 4976ad95513SBjorn Helgaas goto end; 498f5eebbe1SBjorn Helgaas } 499f5eebbe1SBjorn Helgaas } 5001da177e4SLinus Torvalds 501f5eebbe1SBjorn Helgaas INIT_LIST_HEAD(&root->node); 50232917e5bSPatrick Mochel root->device = device; 5030705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5041da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5051da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 506db89b4f0SPavel Machek device->driver_data = root; 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds /* 509990a7ac5SAndrew Patterson * All supported architectures that use ACPI have support for 510990a7ac5SAndrew Patterson * PCI domains, so we indicate this in _OSC support capabilities. 511990a7ac5SAndrew Patterson */ 5120ef5f8f6SAndrew Patterson flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 51363f10f0fSKenji Kaneshige acpi_pci_osc_support(root, flags); 514990a7ac5SAndrew Patterson 515990a7ac5SAndrew Patterson /* 5161da177e4SLinus Torvalds * TBD: Need PCI interface for enumeration/configuration of roots. 5171da177e4SLinus Torvalds */ 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds /* TBD: Locking */ 5201da177e4SLinus Torvalds list_add_tail(&root->node, &acpi_pci_roots); 5211da177e4SLinus Torvalds 5226ad95513SBjorn Helgaas printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", 5231da177e4SLinus Torvalds acpi_device_name(device), acpi_device_bid(device), 5246ad95513SBjorn Helgaas root->segment, &root->secondary); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* 5271da177e4SLinus Torvalds * Scan the Root Bridge 5281da177e4SLinus Torvalds * -------------------- 5291da177e4SLinus Torvalds * Must do this prior to any attempt to bind the root device, as the 5301da177e4SLinus Torvalds * PCI namespace does not get created until this call is made (and 5311da177e4SLinus Torvalds * thus the root bridge's pci_dev does not exist). 5321da177e4SLinus Torvalds */ 53357283776SBjorn Helgaas root->bus = pci_acpi_scan_root(root); 5341da177e4SLinus Torvalds if (!root->bus) { 5356468463aSLen Brown printk(KERN_ERR PREFIX 5366468463aSLen Brown "Bus %04x:%02x not present in PCI namespace\n", 5376ad95513SBjorn Helgaas root->segment, (unsigned int)root->secondary.start); 5381da177e4SLinus Torvalds result = -ENODEV; 5391da177e4SLinus Torvalds goto end; 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds /* 5431da177e4SLinus Torvalds * Attach ACPI-PCI Context 5441da177e4SLinus Torvalds * ----------------------- 5451da177e4SLinus Torvalds * Thus binding the ACPI and PCI devices. 5461da177e4SLinus Torvalds */ 547499650deSAlexander Chiang result = acpi_pci_bind_root(device); 5481da177e4SLinus Torvalds if (result) 5491da177e4SLinus Torvalds goto end; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* 5521da177e4SLinus Torvalds * PCI Routing Table 5531da177e4SLinus Torvalds * ----------------- 5541da177e4SLinus Torvalds * Evaluate and parse _PRT, if exists. 5551da177e4SLinus Torvalds */ 5562d1e0a02SPatrick Mochel status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); 5571da177e4SLinus Torvalds if (ACPI_SUCCESS(status)) 558859a3f86SAlexander Chiang result = acpi_pci_irq_add_prt(device->handle, root->bus); 5591da177e4SLinus Torvalds 5602786f6e3SRui Zhang /* 5612786f6e3SRui Zhang * Scan and bind all _ADR-Based Devices 5622786f6e3SRui Zhang */ 5632786f6e3SRui Zhang list_for_each_entry(child, &device->children, node) 5642786f6e3SRui Zhang acpi_pci_bridge_scan(child); 5652786f6e3SRui Zhang 5660ef5f8f6SAndrew Patterson /* Indicate support for various _OSC capabilities. */ 5670ef5f8f6SAndrew Patterson if (pci_ext_cfg_avail(root->bus->self)) 5680ef5f8f6SAndrew Patterson flags |= OSC_EXT_PCI_CONFIG_SUPPORT; 5698b8bae90SRafael J. Wysocki if (pcie_aspm_support_enabled()) 5703e1b1600SAndrew Patterson flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | 5713e1b1600SAndrew Patterson OSC_CLOCK_PWR_CAPABILITY_SUPPORT; 57207ae95f9SAndrew Patterson if (pci_msi_enabled()) 57307ae95f9SAndrew Patterson flags |= OSC_MSI_SUPPORT; 5740ef5f8f6SAndrew Patterson if (flags != base_flags) 57563f10f0fSKenji Kaneshige acpi_pci_osc_support(root, flags); 5760ef5f8f6SAndrew Patterson 577415e12b2SRafael J. Wysocki if (!pcie_ports_disabled 578415e12b2SRafael J. Wysocki && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { 579415e12b2SRafael J. Wysocki flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL 580415e12b2SRafael J. Wysocki | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 581415e12b2SRafael J. Wysocki | OSC_PCI_EXPRESS_PME_CONTROL; 582415e12b2SRafael J. Wysocki 583415e12b2SRafael J. Wysocki if (pci_aer_available()) { 584415e12b2SRafael J. Wysocki if (aer_acpi_firmware_first()) 585415e12b2SRafael J. Wysocki dev_dbg(root->bus->bridge, 586415e12b2SRafael J. Wysocki "PCIe errors handled by BIOS.\n"); 587415e12b2SRafael J. Wysocki else 588415e12b2SRafael J. Wysocki flags |= OSC_PCI_EXPRESS_AER_CONTROL; 589415e12b2SRafael J. Wysocki } 590415e12b2SRafael J. Wysocki 591415e12b2SRafael J. Wysocki dev_info(root->bus->bridge, 592415e12b2SRafael J. Wysocki "Requesting ACPI _OSC control (0x%02x)\n", flags); 593415e12b2SRafael J. Wysocki 594415e12b2SRafael J. Wysocki status = acpi_pci_osc_control_set(device->handle, &flags, 595415e12b2SRafael J. Wysocki OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); 596eca67315SNaga Chumbalkar if (ACPI_SUCCESS(status)) { 597415e12b2SRafael J. Wysocki dev_info(root->bus->bridge, 598415e12b2SRafael J. Wysocki "ACPI _OSC control (0x%02x) granted\n", flags); 599eca67315SNaga Chumbalkar } else { 600a246670dSRafael J. Wysocki dev_info(root->bus->bridge, 601a246670dSRafael J. Wysocki "ACPI _OSC request failed (%s), " 602a246670dSRafael J. Wysocki "returned control mask: 0x%02x\n", 603a246670dSRafael J. Wysocki acpi_format_exception(status), flags); 604a246670dSRafael J. Wysocki pr_info("ACPI _OSC control for PCIe not granted, " 605a246670dSRafael J. Wysocki "disabling ASPM\n"); 606eca67315SNaga Chumbalkar pcie_no_aspm(); 607eca67315SNaga Chumbalkar } 608a246670dSRafael J. Wysocki } else { 609a246670dSRafael J. Wysocki dev_info(root->bus->bridge, 610a246670dSRafael J. Wysocki "Unable to request _OSC control " 611a246670dSRafael J. Wysocki "(_OSC support mask: 0x%02x)\n", flags); 612415e12b2SRafael J. Wysocki } 613415e12b2SRafael J. Wysocki 614b67ea761SRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device, root->bus); 615b67ea761SRafael J. Wysocki if (device->wakeup.flags.run_wake) 616b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, true); 617b67ea761SRafael J. Wysocki 618f5eebbe1SBjorn Helgaas return 0; 619f5eebbe1SBjorn Helgaas 6201da177e4SLinus Torvalds end: 621c431ada4SRajesh Shah if (!list_empty(&root->node)) 622c431ada4SRajesh Shah list_del(&root->node); 6231da177e4SLinus Torvalds kfree(root); 624d550d98dSPatrick Mochel return result; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6274be44fcdSLen Brown static int acpi_pci_root_start(struct acpi_device *device) 628c431ada4SRajesh Shah { 629caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 630c431ada4SRajesh Shah 631c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 632d550d98dSPatrick Mochel return 0; 633c431ada4SRajesh Shah } 6341da177e4SLinus Torvalds 6354be44fcdSLen Brown static int acpi_pci_root_remove(struct acpi_device *device, int type) 6361da177e4SLinus Torvalds { 637caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 6381da177e4SLinus Torvalds 639b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, false); 640b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 641b67ea761SRafael J. Wysocki 6421da177e4SLinus Torvalds kfree(root); 643d550d98dSPatrick Mochel return 0; 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds static int __init acpi_pci_root_init(void) 6471da177e4SLinus Torvalds { 648d3072e6aSRafael J. Wysocki acpi_hest_init(); 649d3072e6aSRafael J. Wysocki 6501da177e4SLinus Torvalds if (acpi_pci_disabled) 651d550d98dSPatrick Mochel return 0; 6521da177e4SLinus Torvalds 6537bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 6541da177e4SLinus Torvalds if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 655d550d98dSPatrick Mochel return -ENODEV; 6561da177e4SLinus Torvalds 657d550d98dSPatrick Mochel return 0; 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds subsys_initcall(acpi_pci_root_init); 661