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> 387bc5a2baSMatthew Garrett #include <linux/dmi.h> 398b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 401da177e4SLinus Torvalds 41ace8238bSRafael J. Wysocki #include "internal.h" 42ace8238bSRafael J. Wysocki 431da177e4SLinus Torvalds #define _COMPONENT ACPI_PCI_COMPONENT 44f52fd66dSLen Brown ACPI_MODULE_NAME("pci_root"); 451da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 461da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 4700c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 4800c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 4900c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 501da177e4SLinus Torvalds 513338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 523338db00SRafael J. Wysocki { 531f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 543338db00SRafael J. Wysocki return 0; 553338db00SRafael J. Wysocki } 563338db00SRafael J. Wysocki 577dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 587dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 597dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 607dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 61415e12b2SRafael J. Wysocki 62c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 631ba90e3aSThomas Renninger {"PNP0A03", 0}, 641ba90e3aSThomas Renninger {"", 0}, 651ba90e3aSThomas Renninger }; 661ba90e3aSThomas Renninger 6700c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 681ba90e3aSThomas Renninger .ids = root_device_ids, 6900c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 7000c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 71ca499fc8SToshi Kani .hotplug = { 723338db00SRafael J. Wysocki .enabled = true, 733338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 74ca499fc8SToshi Kani }, 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 7763f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 781da177e4SLinus Torvalds 7927558203SAlexander Chiang /** 8027558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 8127558203SAlexander Chiang * @handle - the ACPI CA node in question. 8227558203SAlexander Chiang * 8327558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 8427558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 8527558203SAlexander Chiang */ 8627558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 8727558203SAlexander Chiang { 8827558203SAlexander Chiang int ret; 8927558203SAlexander Chiang struct acpi_device *device; 9027558203SAlexander Chiang 9127558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 9227558203SAlexander Chiang if (ret) 9327558203SAlexander Chiang return 0; 9427558203SAlexander Chiang 9527558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 9627558203SAlexander Chiang if (ret) 9727558203SAlexander Chiang return 0; 9827558203SAlexander Chiang else 9927558203SAlexander Chiang return 1; 10027558203SAlexander Chiang } 10127558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 10227558203SAlexander Chiang 1031da177e4SLinus Torvalds static acpi_status 1041da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 1051da177e4SLinus Torvalds { 1066ad95513SBjorn Helgaas struct resource *res = data; 1071da177e4SLinus Torvalds struct acpi_resource_address64 address; 108f6c1c8ffSBjorn Helgaas acpi_status status; 1091da177e4SLinus Torvalds 110f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 111f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 1121da177e4SLinus Torvalds return AE_OK; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if ((address.address_length > 0) && 1156ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 1166ad95513SBjorn Helgaas res->start = address.minimum; 1176ad95513SBjorn Helgaas res->end = address.minimum + address.address_length - 1; 1186ad95513SBjorn Helgaas } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds return AE_OK; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 123f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1246ad95513SBjorn Helgaas struct resource *res) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds acpi_status status; 1271da177e4SLinus Torvalds 1286ad95513SBjorn Helgaas res->start = -1; 1294be44fcdSLen Brown status = 1304be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1316ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1321da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1331da177e4SLinus Torvalds return status; 1346ad95513SBjorn Helgaas if (res->start == -1) 1351da177e4SLinus Torvalds return AE_ERROR; 1361da177e4SLinus Torvalds return AE_OK; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 139955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 140955f14b4SBjorn Helgaas u32 bit; 141955f14b4SBjorn Helgaas char *desc; 142955f14b4SBjorn Helgaas }; 143955f14b4SBjorn Helgaas 144955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 145955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 146955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 147955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 148955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 149955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 150955f14b4SBjorn Helgaas }; 151955f14b4SBjorn Helgaas 152955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 153955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 154955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 155955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 156955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 157955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 158955f14b4SBjorn Helgaas }; 159955f14b4SBjorn Helgaas 160955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 161955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 162955f14b4SBjorn Helgaas { 163955f14b4SBjorn Helgaas char buf[80]; 164955f14b4SBjorn Helgaas int i, len = 0; 165955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 166955f14b4SBjorn Helgaas 167955f14b4SBjorn Helgaas buf[0] = '\0'; 168955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 169955f14b4SBjorn Helgaas if (word & entry->bit) 170955f14b4SBjorn Helgaas len += snprintf(buf + len, sizeof(buf) - len, "%s%s", 171955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 172955f14b4SBjorn Helgaas 173955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 174955f14b4SBjorn Helgaas } 175955f14b4SBjorn Helgaas 176955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 177955f14b4SBjorn Helgaas { 178955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 179955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 180955f14b4SBjorn Helgaas } 181955f14b4SBjorn Helgaas 182955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 183955f14b4SBjorn Helgaas { 184955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 185955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 186955f14b4SBjorn Helgaas } 187955f14b4SBjorn Helgaas 1883a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 18963f10f0fSKenji Kaneshige 19063f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 19163f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 19263f10f0fSKenji Kaneshige { 1933a9622dcSShaohua Li struct acpi_osc_context context = { 1943a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1953a9622dcSShaohua Li .rev = 1, 1963a9622dcSShaohua Li .cap.length = 12, 1973a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1983a9622dcSShaohua Li }; 19963f10f0fSKenji Kaneshige acpi_status status; 20063f10f0fSKenji Kaneshige 2013a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 2023a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 2033a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 2043a9622dcSShaohua Li kfree(context.ret.pointer); 20563f10f0fSKenji Kaneshige } 20663f10f0fSKenji Kaneshige return status; 20763f10f0fSKenji Kaneshige } 20863f10f0fSKenji Kaneshige 209ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 210ab8e8957SRafael J. Wysocki u32 support, 211ab8e8957SRafael J. Wysocki u32 *control) 21263f10f0fSKenji Kaneshige { 21363f10f0fSKenji Kaneshige acpi_status status; 214ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 21563f10f0fSKenji Kaneshige 216ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 217ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 218ab8e8957SRafael J. Wysocki 219b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 220b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 221ab8e8957SRafael J. Wysocki if (control) { 222ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 223b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 224ab8e8957SRafael J. Wysocki } else { 225545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 226b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 227ab8e8957SRafael J. Wysocki } 22863f10f0fSKenji Kaneshige 22963f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 23063f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 231ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2322b8fd918SRafael J. Wysocki if (control) 233ab8e8957SRafael J. Wysocki *control = result; 234ab8e8957SRafael J. Wysocki } 23563f10f0fSKenji Kaneshige return status; 23663f10f0fSKenji Kaneshige } 23763f10f0fSKenji Kaneshige 23863f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 23963f10f0fSKenji Kaneshige { 24063f10f0fSKenji Kaneshige acpi_status status; 24163f10f0fSKenji Kaneshige 24263f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 243ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 24463f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 24563f10f0fSKenji Kaneshige return status; 24663f10f0fSKenji Kaneshige } 24763f10f0fSKenji Kaneshige 24876d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 24963f10f0fSKenji Kaneshige { 25063f10f0fSKenji Kaneshige struct acpi_pci_root *root; 251cd4faf9cSTaku Izumi struct acpi_device *device; 252c1aec834SBjorn Helgaas 253cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 254cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 25563f10f0fSKenji Kaneshige return NULL; 256cd4faf9cSTaku Izumi 257cd4faf9cSTaku Izumi root = acpi_driver_data(device); 258cd4faf9cSTaku Izumi 259cd4faf9cSTaku Izumi return root; 26063f10f0fSKenji Kaneshige } 26176d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 26263f10f0fSKenji Kaneshige 2632f7bbcebSAlexander Chiang struct acpi_handle_node { 2642f7bbcebSAlexander Chiang struct list_head node; 2652f7bbcebSAlexander Chiang acpi_handle handle; 2662f7bbcebSAlexander Chiang }; 2672f7bbcebSAlexander Chiang 2682f7bbcebSAlexander Chiang /** 2692f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2702f7bbcebSAlexander Chiang * @handle: the handle in question 2712f7bbcebSAlexander Chiang * 2722f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2732f7bbcebSAlexander Chiang * list of PCI devices. 2742f7bbcebSAlexander Chiang * 2752f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2762f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2772f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2782f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2792f7bbcebSAlexander Chiang */ 2802f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2812f7bbcebSAlexander Chiang { 2822f7bbcebSAlexander Chiang int dev, fn; 2832f7bbcebSAlexander Chiang unsigned long long adr; 2842f7bbcebSAlexander Chiang acpi_status status; 2852f7bbcebSAlexander Chiang acpi_handle phandle; 2862f7bbcebSAlexander Chiang struct pci_bus *pbus; 2872f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2882f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2892f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2902f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2912f7bbcebSAlexander Chiang 2922f7bbcebSAlexander Chiang /* 2932f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2942f7bbcebSAlexander Chiang */ 2952f7bbcebSAlexander Chiang phandle = handle; 2962f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2972f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2982f7bbcebSAlexander Chiang if (!node) 2992f7bbcebSAlexander Chiang goto out; 3002f7bbcebSAlexander Chiang 3012f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 3022f7bbcebSAlexander Chiang node->handle = phandle; 3032f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 3042f7bbcebSAlexander Chiang 3052f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 3062f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3072f7bbcebSAlexander Chiang goto out; 3082f7bbcebSAlexander Chiang } 3092f7bbcebSAlexander Chiang 3102f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 3112f7bbcebSAlexander Chiang if (!root) 3122f7bbcebSAlexander Chiang goto out; 3132f7bbcebSAlexander Chiang 3142f7bbcebSAlexander Chiang pbus = root->bus; 3152f7bbcebSAlexander Chiang 3162f7bbcebSAlexander Chiang /* 3172f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3182f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3192f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3202f7bbcebSAlexander Chiang */ 3212f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3222f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3232f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3242f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3252f7bbcebSAlexander Chiang goto out; 3262f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3272f7bbcebSAlexander Chiang fn = adr & 0xffff; 3282f7bbcebSAlexander Chiang 3292f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 330412af978STroy Moure if (!pdev || hnd == handle) 3312f7bbcebSAlexander Chiang break; 3322f7bbcebSAlexander Chiang 3332f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3342f7bbcebSAlexander Chiang pci_dev_put(pdev); 335497fb54fSRafael J. Wysocki 336497fb54fSRafael J. Wysocki /* 337497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 338497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 339497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 340497fb54fSRafael J. Wysocki */ 341497fb54fSRafael J. Wysocki if (!pbus) { 342497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 343497fb54fSRafael J. Wysocki pdev = NULL; 344497fb54fSRafael J. Wysocki break; 345497fb54fSRafael J. Wysocki } 3462f7bbcebSAlexander Chiang } 3472f7bbcebSAlexander Chiang out: 3482f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3492f7bbcebSAlexander Chiang kfree(node); 3502f7bbcebSAlexander Chiang 3512f7bbcebSAlexander Chiang return pdev; 3522f7bbcebSAlexander Chiang } 3532f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3542f7bbcebSAlexander Chiang 35563f10f0fSKenji Kaneshige /** 35675fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 35775fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 35875fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 35975fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 36063f10f0fSKenji Kaneshige * 36175fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 36275fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 36375fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 36475fb60f2SRafael J. Wysocki * 36575fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 36675fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 36775fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 36875fb60f2SRafael J. Wysocki * on failure. 36963f10f0fSKenji Kaneshige **/ 37075fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 37163f10f0fSKenji Kaneshige { 37263f10f0fSKenji Kaneshige struct acpi_pci_root *root; 3734ffe6e54SBjorn Helgaas acpi_status status = AE_OK; 37475fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 37563f10f0fSKenji Kaneshige 37675fb60f2SRafael J. Wysocki if (!mask) 37775fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 37875fb60f2SRafael J. Wysocki 37975fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 38075fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 38163f10f0fSKenji Kaneshige return AE_TYPE; 38263f10f0fSKenji Kaneshige 38363f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 38463f10f0fSKenji Kaneshige if (!root) 38563f10f0fSKenji Kaneshige return AE_NOT_EXIST; 38663f10f0fSKenji Kaneshige 38763f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 38875fb60f2SRafael J. Wysocki 38975fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 39063f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 39175fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 39263f10f0fSKenji Kaneshige goto out; 39363f10f0fSKenji Kaneshige 39475fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 39575fb60f2SRafael J. Wysocki while (*mask) { 39675fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 39763f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 39863f10f0fSKenji Kaneshige goto out; 39975fb60f2SRafael J. Wysocki if (ctrl == *mask) 40075fb60f2SRafael J. Wysocki break; 401955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 402955f14b4SBjorn Helgaas ctrl & ~(*mask)); 40375fb60f2SRafael J. Wysocki ctrl = *mask; 40475fb60f2SRafael J. Wysocki } 4052b8fd918SRafael J. Wysocki 40675fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 407955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 408955f14b4SBjorn Helgaas req & ~(ctrl)); 40963f10f0fSKenji Kaneshige status = AE_SUPPORT; 41063f10f0fSKenji Kaneshige goto out; 41163f10f0fSKenji Kaneshige } 41263f10f0fSKenji Kaneshige 413b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 414b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 415b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 41675fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 41763f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 41875fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 41963f10f0fSKenji Kaneshige out: 42063f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 42163f10f0fSKenji Kaneshige return status; 42263f10f0fSKenji Kaneshige } 4239f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 42463f10f0fSKenji Kaneshige 4253e43abb0SBjorn Helgaas static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 4263e43abb0SBjorn Helgaas int *clear_aspm) 4273e43abb0SBjorn Helgaas { 428955f14b4SBjorn Helgaas u32 support, control, requested; 4293e43abb0SBjorn Helgaas acpi_status status; 4303e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4313e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4323e43abb0SBjorn Helgaas 4333e43abb0SBjorn Helgaas /* 4347bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4357bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4367bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4377bc5a2baSMatthew Garrett */ 4387bc5a2baSMatthew Garrett 4397bc5a2baSMatthew Garrett if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) { 4407bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4417bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4427bc5a2baSMatthew Garrett root->osc_control_set); 4437bc5a2baSMatthew Garrett return; 4447bc5a2baSMatthew Garrett } 4457bc5a2baSMatthew Garrett 4467bc5a2baSMatthew Garrett /* 4473e43abb0SBjorn Helgaas * All supported architectures that use ACPI have support for 4483e43abb0SBjorn Helgaas * PCI domains, so we indicate this in _OSC support capabilities. 4493e43abb0SBjorn Helgaas */ 45065afe916SBjorn Helgaas support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 4513e43abb0SBjorn Helgaas if (pci_ext_cfg_avail()) 452b8eb67fcSBjorn Helgaas support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4531b2a7be6SBjorn Helgaas if (pcie_aspm_support_enabled()) 454b8eb67fcSBjorn Helgaas support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4553e43abb0SBjorn Helgaas if (pci_msi_enabled()) 456b8eb67fcSBjorn Helgaas support |= OSC_PCI_MSI_SUPPORT; 457955f14b4SBjorn Helgaas 458955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 459b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4603e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 46165afe916SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 46265afe916SBjorn Helgaas acpi_format_exception(status)); 4633e43abb0SBjorn Helgaas *no_aspm = 1; 46465afe916SBjorn Helgaas return; 4653e43abb0SBjorn Helgaas } 4663e43abb0SBjorn Helgaas 46743613a1fSBjorn Helgaas if (pcie_ports_disabled) { 46843613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 46943613a1fSBjorn Helgaas return; 47043613a1fSBjorn Helgaas } 47143613a1fSBjorn Helgaas 472de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 473955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 474955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 475de189662SBjorn Helgaas return; 476de189662SBjorn Helgaas } 477de189662SBjorn Helgaas 478b8eb67fcSBjorn Helgaas control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4793e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 4803e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_PME_CONTROL; 4813e43abb0SBjorn Helgaas 4823e43abb0SBjorn Helgaas if (pci_aer_available()) { 4833e43abb0SBjorn Helgaas if (aer_acpi_firmware_first()) 484955f14b4SBjorn Helgaas dev_info(&device->dev, 485955f14b4SBjorn Helgaas "PCIe AER handled by firmware\n"); 4863e43abb0SBjorn Helgaas else 487b8eb67fcSBjorn Helgaas control |= OSC_PCI_EXPRESS_AER_CONTROL; 4883e43abb0SBjorn Helgaas } 4893e43abb0SBjorn Helgaas 490955f14b4SBjorn Helgaas requested = control; 491b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 4923e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 4933e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 494955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 4953e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 4963e43abb0SBjorn Helgaas /* 4973e43abb0SBjorn Helgaas * We have ASPM control, but the FADT indicates 4983e43abb0SBjorn Helgaas * that it's unsupported. Clear it. 4993e43abb0SBjorn Helgaas */ 5003e43abb0SBjorn Helgaas *clear_aspm = 1; 5013e43abb0SBjorn Helgaas } 5023e43abb0SBjorn Helgaas } else { 503955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 504955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 505955f14b4SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 506955f14b4SBjorn Helgaas acpi_format_exception(status)); 507955f14b4SBjorn Helgaas 5083e43abb0SBjorn Helgaas /* 5093e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5103e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5113e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5123e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5133e43abb0SBjorn Helgaas * root scan. 5143e43abb0SBjorn Helgaas */ 5153e43abb0SBjorn Helgaas *no_aspm = 1; 5163e43abb0SBjorn Helgaas } 5173e43abb0SBjorn Helgaas } 5183e43abb0SBjorn Helgaas 51900c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 52000c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5211da177e4SLinus Torvalds { 522f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 523f5eebbe1SBjorn Helgaas acpi_status status; 524f5eebbe1SBjorn Helgaas int result; 525f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 526bfe2414aSJiang Liu acpi_handle handle = device->handle; 5273e43abb0SBjorn Helgaas int no_aspm = 0, clear_aspm = 0; 5281da177e4SLinus Torvalds 5296ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5306ad95513SBjorn Helgaas if (!root) 5316ad95513SBjorn Helgaas return -ENOMEM; 5326ad95513SBjorn Helgaas 533f5eebbe1SBjorn Helgaas segment = 0; 534bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 535f5eebbe1SBjorn Helgaas &segment); 536f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5376dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5386ad95513SBjorn Helgaas result = -ENODEV; 5396ad95513SBjorn Helgaas goto end; 540f5eebbe1SBjorn Helgaas } 5411da177e4SLinus Torvalds 542f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5436ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 544bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 545f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5466ad95513SBjorn Helgaas /* 5476ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5486ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5496ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5506ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5516ad95513SBjorn Helgaas */ 5526ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5536dc7d22cSJiang Liu dev_warn(&device->dev, 5546dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 555bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 556e545b55aSJon Mason NULL, &bus); 5576ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5586ad95513SBjorn Helgaas root->secondary.start = bus; 5596ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5606ad95513SBjorn Helgaas root->secondary.start = 0; 5616ad95513SBjorn Helgaas else { 5626dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5636ad95513SBjorn Helgaas result = -ENODEV; 5646ad95513SBjorn Helgaas goto end; 565f5eebbe1SBjorn Helgaas } 566f5eebbe1SBjorn Helgaas } 5671da177e4SLinus Torvalds 56832917e5bSPatrick Mochel root->device = device; 5690705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5701da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5711da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 572db89b4f0SPavel Machek device->driver_data = root; 5731da177e4SLinus Torvalds 5746dc7d22cSJiang Liu pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", 575d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 576d4761ba2SBjorn Helgaas root->segment, &root->secondary); 577d4761ba2SBjorn Helgaas 578bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 579f4b57a3bSJiang Liu 5803e43abb0SBjorn Helgaas negotiate_os_control(root, &no_aspm, &clear_aspm); 581415e12b2SRafael J. Wysocki 5823dc48af3SNeil Horman /* 5833dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5843dc48af3SNeil Horman */ 5853dc48af3SNeil Horman 5863dc48af3SNeil Horman /* 5873dc48af3SNeil Horman * Scan the Root Bridge 5883dc48af3SNeil Horman * -------------------- 5893dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 5903dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 5913dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 5923dc48af3SNeil Horman */ 5933dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 5943dc48af3SNeil Horman if (!root->bus) { 5953dc48af3SNeil Horman dev_err(&device->dev, 5963dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 5973dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 598f516bde5SRafael J. Wysocki device->driver_data = NULL; 5993dc48af3SNeil Horman result = -ENODEV; 6003dc48af3SNeil Horman goto end; 6013dc48af3SNeil Horman } 6023dc48af3SNeil Horman 6033dc48af3SNeil Horman if (clear_aspm) { 6043dc48af3SNeil Horman dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); 6053dc48af3SNeil Horman pcie_clear_aspm(root->bus); 6063dc48af3SNeil Horman } 6073dc48af3SNeil Horman if (no_aspm) 6083dc48af3SNeil Horman pcie_no_aspm(); 6093dc48af3SNeil Horman 610c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 611b67ea761SRafael J. Wysocki if (device->wakeup.flags.run_wake) 612b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, true); 613b67ea761SRafael J. Wysocki 6143c449ed0SYinghai Lu if (system_state != SYSTEM_BOOTING) { 6153c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 61639772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 617516ca223SJiang Liu } 61862a08c5aSYinghai Lu 6197a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 620c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6217a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 62200c43b96SRafael J. Wysocki return 1; 62347525cdaSRafael J. Wysocki 62447525cdaSRafael J. Wysocki end: 62547525cdaSRafael J. Wysocki kfree(root); 62647525cdaSRafael J. Wysocki return result; 627c431ada4SRajesh Shah } 6281da177e4SLinus Torvalds 62900c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6301da177e4SLinus Torvalds { 631caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 632c8e9afb1SJiang Liu 6337a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6347a3bb55eSRafael J. Wysocki 6359738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6369738a1fdSYinghai Lu 637b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, false); 638b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 639b67ea761SRafael J. Wysocki 6409738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 6419738a1fdSYinghai Lu 6427a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6437a3bb55eSRafael J. Wysocki 6441da177e4SLinus Torvalds kfree(root); 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 64700c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 6481da177e4SLinus Torvalds { 649d3072e6aSRafael J. Wysocki acpi_hest_init(); 6503338db00SRafael J. Wysocki if (acpi_pci_disabled) 6513338db00SRafael J. Wysocki return; 652d3072e6aSRafael J. Wysocki 6537bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 6543338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 655668192b6SYinghai Lu } 656