1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 61da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 9ccde83e3SHanjun Guo #define pr_fmt(fmt) "ACPI: " fmt 10ccde83e3SHanjun Guo 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/types.h> 15d0020f65STaku Izumi #include <linux/mutex.h> 161da177e4SLinus Torvalds #include <linux/pm.h> 17b67ea761SRafael J. Wysocki #include <linux/pm_runtime.h> 181da177e4SLinus Torvalds #include <linux/pci.h> 19990a7ac5SAndrew Patterson #include <linux/pci-acpi.h> 20864b94adSJiang Liu #include <linux/dmar.h> 211da177e4SLinus Torvalds #include <linux/acpi.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 237bc5a2baSMatthew Garrett #include <linux/dmi.h> 24630b3affSLukas Wunner #include <linux/platform_data/x86/apple.h> 258b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 261da177e4SLinus Torvalds 27ace8238bSRafael J. Wysocki #include "internal.h" 28ace8238bSRafael J. Wysocki 291da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 301da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 3100c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 3200c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 3300c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 341da177e4SLinus Torvalds 353338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 363338db00SRafael J. Wysocki { 371f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 383338db00SRafael J. Wysocki return 0; 393338db00SRafael J. Wysocki } 403338db00SRafael J. Wysocki 417dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 427dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 437dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 447dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 45415e12b2SRafael J. Wysocki 46c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 471ba90e3aSThomas Renninger {"PNP0A03", 0}, 481ba90e3aSThomas Renninger {"", 0}, 491ba90e3aSThomas Renninger }; 501ba90e3aSThomas Renninger 5100c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 521ba90e3aSThomas Renninger .ids = root_device_ids, 5300c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 5400c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 55ca499fc8SToshi Kani .hotplug = { 563338db00SRafael J. Wysocki .enabled = true, 573338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 58ca499fc8SToshi Kani }, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 6127558203SAlexander Chiang /** 6227558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 638e8883ceSTian Tao * @handle: the ACPI CA node in question. 6427558203SAlexander Chiang * 6527558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6627558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 6727558203SAlexander Chiang */ 6827558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 6927558203SAlexander Chiang { 7027558203SAlexander Chiang int ret; 7127558203SAlexander Chiang struct acpi_device *device; 7227558203SAlexander Chiang 7327558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 7427558203SAlexander Chiang if (ret) 7527558203SAlexander Chiang return 0; 7627558203SAlexander Chiang 7727558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 7827558203SAlexander Chiang if (ret) 7927558203SAlexander Chiang return 0; 8027558203SAlexander Chiang else 8127558203SAlexander Chiang return 1; 8227558203SAlexander Chiang } 8327558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8427558203SAlexander Chiang 851da177e4SLinus Torvalds static acpi_status 861da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 871da177e4SLinus Torvalds { 886ad95513SBjorn Helgaas struct resource *res = data; 891da177e4SLinus Torvalds struct acpi_resource_address64 address; 90f6c1c8ffSBjorn Helgaas acpi_status status; 911da177e4SLinus Torvalds 92f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 93f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 941da177e4SLinus Torvalds return AE_OK; 951da177e4SLinus Torvalds 96a45de93eSLv Zheng if ((address.address.address_length > 0) && 976ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 98a45de93eSLv Zheng res->start = address.address.minimum; 99a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 1006ad95513SBjorn Helgaas } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds return AE_OK; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 105f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1066ad95513SBjorn Helgaas struct resource *res) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds acpi_status status; 1091da177e4SLinus Torvalds 1106ad95513SBjorn Helgaas res->start = -1; 1114be44fcdSLen Brown status = 1124be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1136ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1141da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1151da177e4SLinus Torvalds return status; 1166ad95513SBjorn Helgaas if (res->start == -1) 1171da177e4SLinus Torvalds return AE_ERROR; 1181da177e4SLinus Torvalds return AE_OK; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 121955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 122955f14b4SBjorn Helgaas u32 bit; 123955f14b4SBjorn Helgaas char *desc; 124955f14b4SBjorn Helgaas }; 125955f14b4SBjorn Helgaas 126955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 127955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 128955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 129955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 130955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 131955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 132ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EDR_SUPPORT, "EDR" }, 133ba11edc6SAlexandru Gagniuc { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, 134955f14b4SBjorn Helgaas }; 135955f14b4SBjorn Helgaas 136955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 137955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 138955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 139955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 140955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 141955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 142af8bb9f8SBjorn Helgaas { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, 143ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, 144955f14b4SBjorn Helgaas }; 145955f14b4SBjorn Helgaas 146955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 147955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 148955f14b4SBjorn Helgaas { 149955f14b4SBjorn Helgaas char buf[80]; 150955f14b4SBjorn Helgaas int i, len = 0; 151955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 152955f14b4SBjorn Helgaas 153955f14b4SBjorn Helgaas buf[0] = '\0'; 154955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 155955f14b4SBjorn Helgaas if (word & entry->bit) 156edd66086STakashi Iwai len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", 157955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 158955f14b4SBjorn Helgaas 159955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 160955f14b4SBjorn Helgaas } 161955f14b4SBjorn Helgaas 162955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 163955f14b4SBjorn Helgaas { 164955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 165955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 166955f14b4SBjorn Helgaas } 167955f14b4SBjorn Helgaas 168955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 169955f14b4SBjorn Helgaas { 170955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 171955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 172955f14b4SBjorn Helgaas } 173955f14b4SBjorn Helgaas 1743a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17563f10f0fSKenji Kaneshige 17663f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17763f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 17863f10f0fSKenji Kaneshige { 1793a9622dcSShaohua Li struct acpi_osc_context context = { 1803a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1813a9622dcSShaohua Li .rev = 1, 1823a9622dcSShaohua Li .cap.length = 12, 1833a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1843a9622dcSShaohua Li }; 18563f10f0fSKenji Kaneshige acpi_status status; 18663f10f0fSKenji Kaneshige 1873a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1883a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1893a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1903a9622dcSShaohua Li kfree(context.ret.pointer); 19163f10f0fSKenji Kaneshige } 19263f10f0fSKenji Kaneshige return status; 19363f10f0fSKenji Kaneshige } 19463f10f0fSKenji Kaneshige 195ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 196ab8e8957SRafael J. Wysocki u32 support, 197ab8e8957SRafael J. Wysocki u32 *control) 19863f10f0fSKenji Kaneshige { 19963f10f0fSKenji Kaneshige acpi_status status; 200ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 20163f10f0fSKenji Kaneshige 202ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 203ab8e8957SRafael J. Wysocki 204b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 205b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 206af9d8262SJoerg Roedel if (control) 207b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 208af9d8262SJoerg Roedel else 209545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 210b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 21163f10f0fSKenji Kaneshige 21263f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 21363f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 214ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2152b8fd918SRafael J. Wysocki if (control) 216ab8e8957SRafael J. Wysocki *control = result; 217ab8e8957SRafael J. Wysocki } 21863f10f0fSKenji Kaneshige return status; 21963f10f0fSKenji Kaneshige } 22063f10f0fSKenji Kaneshige 22163f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 22263f10f0fSKenji Kaneshige { 223866e61fcSBjorn Helgaas return acpi_pci_query_osc(root, flags, NULL); 22463f10f0fSKenji Kaneshige } 22563f10f0fSKenji Kaneshige 22676d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 22763f10f0fSKenji Kaneshige { 22863f10f0fSKenji Kaneshige struct acpi_pci_root *root; 229cd4faf9cSTaku Izumi struct acpi_device *device; 230c1aec834SBjorn Helgaas 231cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 232cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 23363f10f0fSKenji Kaneshige return NULL; 234cd4faf9cSTaku Izumi 235cd4faf9cSTaku Izumi root = acpi_driver_data(device); 236cd4faf9cSTaku Izumi 237cd4faf9cSTaku Izumi return root; 23863f10f0fSKenji Kaneshige } 23976d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 24063f10f0fSKenji Kaneshige 2412f7bbcebSAlexander Chiang struct acpi_handle_node { 2422f7bbcebSAlexander Chiang struct list_head node; 2432f7bbcebSAlexander Chiang acpi_handle handle; 2442f7bbcebSAlexander Chiang }; 2452f7bbcebSAlexander Chiang 2462f7bbcebSAlexander Chiang /** 2472f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2482f7bbcebSAlexander Chiang * @handle: the handle in question 2492f7bbcebSAlexander Chiang * 2502f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2512f7bbcebSAlexander Chiang * list of PCI devices. 2522f7bbcebSAlexander Chiang * 2532f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2542f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2552f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2562f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2572f7bbcebSAlexander Chiang */ 2582f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2592f7bbcebSAlexander Chiang { 2602f7bbcebSAlexander Chiang int dev, fn; 2612f7bbcebSAlexander Chiang unsigned long long adr; 2622f7bbcebSAlexander Chiang acpi_status status; 2632f7bbcebSAlexander Chiang acpi_handle phandle; 2642f7bbcebSAlexander Chiang struct pci_bus *pbus; 2652f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2662f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2672f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2682f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2692f7bbcebSAlexander Chiang 2702f7bbcebSAlexander Chiang /* 2712f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2722f7bbcebSAlexander Chiang */ 2732f7bbcebSAlexander Chiang phandle = handle; 2742f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2752f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2762f7bbcebSAlexander Chiang if (!node) 2772f7bbcebSAlexander Chiang goto out; 2782f7bbcebSAlexander Chiang 2792f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2802f7bbcebSAlexander Chiang node->handle = phandle; 2812f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2822f7bbcebSAlexander Chiang 2832f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2842f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2852f7bbcebSAlexander Chiang goto out; 2862f7bbcebSAlexander Chiang } 2872f7bbcebSAlexander Chiang 2882f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2892f7bbcebSAlexander Chiang if (!root) 2902f7bbcebSAlexander Chiang goto out; 2912f7bbcebSAlexander Chiang 2922f7bbcebSAlexander Chiang pbus = root->bus; 2932f7bbcebSAlexander Chiang 2942f7bbcebSAlexander Chiang /* 2952f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 2962f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 2972f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 2982f7bbcebSAlexander Chiang */ 2992f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3002f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3012f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3022f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3032f7bbcebSAlexander Chiang goto out; 3042f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3052f7bbcebSAlexander Chiang fn = adr & 0xffff; 3062f7bbcebSAlexander Chiang 3072f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 308412af978STroy Moure if (!pdev || hnd == handle) 3092f7bbcebSAlexander Chiang break; 3102f7bbcebSAlexander Chiang 3112f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3122f7bbcebSAlexander Chiang pci_dev_put(pdev); 313497fb54fSRafael J. Wysocki 314497fb54fSRafael J. Wysocki /* 315497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 316497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 317497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 318497fb54fSRafael J. Wysocki */ 319497fb54fSRafael J. Wysocki if (!pbus) { 320497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 321497fb54fSRafael J. Wysocki pdev = NULL; 322497fb54fSRafael J. Wysocki break; 323497fb54fSRafael J. Wysocki } 3242f7bbcebSAlexander Chiang } 3252f7bbcebSAlexander Chiang out: 3262f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3272f7bbcebSAlexander Chiang kfree(node); 3282f7bbcebSAlexander Chiang 3292f7bbcebSAlexander Chiang return pdev; 3302f7bbcebSAlexander Chiang } 3312f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3322f7bbcebSAlexander Chiang 33363f10f0fSKenji Kaneshige /** 33475fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 33575fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 33675fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 33775fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 33863f10f0fSKenji Kaneshige * 33975fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 34075fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 34175fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 34275fb60f2SRafael J. Wysocki * 34375fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 34475fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 34575fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 34675fb60f2SRafael J. Wysocki * on failure. 34763f10f0fSKenji Kaneshige **/ 3481423de71SBjorn Helgaas static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 34963f10f0fSKenji Kaneshige { 35063f10f0fSKenji Kaneshige struct acpi_pci_root *root; 351866e61fcSBjorn Helgaas acpi_status status; 35275fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 35363f10f0fSKenji Kaneshige 35475fb60f2SRafael J. Wysocki if (!mask) 35575fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 35675fb60f2SRafael J. Wysocki 357af9d8262SJoerg Roedel ctrl = *mask; 35875fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 35963f10f0fSKenji Kaneshige return AE_TYPE; 36063f10f0fSKenji Kaneshige 36163f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 36263f10f0fSKenji Kaneshige if (!root) 36363f10f0fSKenji Kaneshige return AE_NOT_EXIST; 36463f10f0fSKenji Kaneshige 36575fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 36663f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 36775fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 368866e61fcSBjorn Helgaas return AE_OK; 36963f10f0fSKenji Kaneshige 37075fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 37175fb60f2SRafael J. Wysocki while (*mask) { 37275fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 37363f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 374866e61fcSBjorn Helgaas return status; 37575fb60f2SRafael J. Wysocki if (ctrl == *mask) 37675fb60f2SRafael J. Wysocki break; 377955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 378955f14b4SBjorn Helgaas ctrl & ~(*mask)); 37975fb60f2SRafael J. Wysocki ctrl = *mask; 38075fb60f2SRafael J. Wysocki } 3812b8fd918SRafael J. Wysocki 38275fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 383955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 384955f14b4SBjorn Helgaas req & ~(ctrl)); 385866e61fcSBjorn Helgaas return AE_SUPPORT; 38663f10f0fSKenji Kaneshige } 38763f10f0fSKenji Kaneshige 388b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 389b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 390b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 39175fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 392866e61fcSBjorn Helgaas if (ACPI_FAILURE(status)) 39363f10f0fSKenji Kaneshige return status; 394866e61fcSBjorn Helgaas 395866e61fcSBjorn Helgaas root->osc_control_set = *mask; 396866e61fcSBjorn Helgaas return AE_OK; 39763f10f0fSKenji Kaneshige } 39863f10f0fSKenji Kaneshige 399*4c6f6060SJoerg Roedel static u32 calculate_support(void) 400*4c6f6060SJoerg Roedel { 401*4c6f6060SJoerg Roedel u32 support; 402*4c6f6060SJoerg Roedel 403*4c6f6060SJoerg Roedel /* 404*4c6f6060SJoerg Roedel * All supported architectures that use ACPI have support for 405*4c6f6060SJoerg Roedel * PCI domains, so we indicate this in _OSC support capabilities. 406*4c6f6060SJoerg Roedel */ 407*4c6f6060SJoerg Roedel support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 408*4c6f6060SJoerg Roedel support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 409*4c6f6060SJoerg Roedel if (pci_ext_cfg_avail()) 410*4c6f6060SJoerg Roedel support |= OSC_PCI_EXT_CONFIG_SUPPORT; 411*4c6f6060SJoerg Roedel if (pcie_aspm_support_enabled()) 412*4c6f6060SJoerg Roedel support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 413*4c6f6060SJoerg Roedel if (pci_msi_enabled()) 414*4c6f6060SJoerg Roedel support |= OSC_PCI_MSI_SUPPORT; 415*4c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_EDR)) 416*4c6f6060SJoerg Roedel support |= OSC_PCI_EDR_SUPPORT; 417*4c6f6060SJoerg Roedel 418*4c6f6060SJoerg Roedel return support; 419*4c6f6060SJoerg Roedel } 420*4c6f6060SJoerg Roedel 421*4c6f6060SJoerg Roedel static u32 calculate_control(void) 422*4c6f6060SJoerg Roedel { 423*4c6f6060SJoerg Roedel u32 control; 424*4c6f6060SJoerg Roedel 425*4c6f6060SJoerg Roedel control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 426*4c6f6060SJoerg Roedel | OSC_PCI_EXPRESS_PME_CONTROL; 427*4c6f6060SJoerg Roedel 428*4c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIEASPM)) 429*4c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_LTR_CONTROL; 430*4c6f6060SJoerg Roedel 431*4c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 432*4c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 433*4c6f6060SJoerg Roedel 434*4c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 435*4c6f6060SJoerg Roedel control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 436*4c6f6060SJoerg Roedel 437*4c6f6060SJoerg Roedel if (pci_aer_available()) 438*4c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_AER_CONTROL; 439*4c6f6060SJoerg Roedel 440*4c6f6060SJoerg Roedel /* 441*4c6f6060SJoerg Roedel * Per the Downstream Port Containment Related Enhancements ECN to 442*4c6f6060SJoerg Roedel * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, 443*4c6f6060SJoerg Roedel * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC 444*4c6f6060SJoerg Roedel * and EDR. 445*4c6f6060SJoerg Roedel */ 446*4c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) 447*4c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_DPC_CONTROL; 448*4c6f6060SJoerg Roedel 449*4c6f6060SJoerg Roedel return control; 450*4c6f6060SJoerg Roedel } 451*4c6f6060SJoerg Roedel 452c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 453c238252fSSinan Kaya bool is_pcie) 4543e43abb0SBjorn Helgaas { 455955f14b4SBjorn Helgaas u32 support, control, requested; 4563e43abb0SBjorn Helgaas acpi_status status; 4573e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4583e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4593e43abb0SBjorn Helgaas 4603e43abb0SBjorn Helgaas /* 4617bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4627bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4637bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4647bc5a2baSMatthew Garrett */ 465630b3affSLukas Wunner if (x86_apple_machine) { 4667bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4677bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4687bc5a2baSMatthew Garrett root->osc_control_set); 4697bc5a2baSMatthew Garrett return; 4707bc5a2baSMatthew Garrett } 4717bc5a2baSMatthew Garrett 472*4c6f6060SJoerg Roedel support = calculate_support(); 473955f14b4SBjorn Helgaas 474955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 475b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4763e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 477c238252fSSinan Kaya *no_aspm = 1; 478c238252fSSinan Kaya 479c238252fSSinan Kaya /* _OSC is optional for PCI host bridges */ 480c238252fSSinan Kaya if ((status == AE_NOT_FOUND) && !is_pcie) 481c238252fSSinan Kaya return; 482c238252fSSinan Kaya 483508d392aSBjorn Helgaas dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", 484508d392aSBjorn Helgaas acpi_format_exception(status)); 48565afe916SBjorn Helgaas return; 4863e43abb0SBjorn Helgaas } 4873e43abb0SBjorn Helgaas 48843613a1fSBjorn Helgaas if (pcie_ports_disabled) { 48943613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 49043613a1fSBjorn Helgaas return; 49143613a1fSBjorn Helgaas } 49243613a1fSBjorn Helgaas 493de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 494955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 495955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 496de189662SBjorn Helgaas return; 497de189662SBjorn Helgaas } 498de189662SBjorn Helgaas 499*4c6f6060SJoerg Roedel requested = control = calculate_control(); 5003e43abb0SBjorn Helgaas 501b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 5023e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 5033e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 504955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 5053e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 5063e43abb0SBjorn Helgaas /* 507387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 508387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 509387d3757SMatthew Garrett * intact and prevent the OS from touching it. 5103e43abb0SBjorn Helgaas */ 511387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 512387d3757SMatthew Garrett *no_aspm = 1; 5133e43abb0SBjorn Helgaas } 5143e43abb0SBjorn Helgaas } else { 515955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 516955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 517508d392aSBjorn Helgaas dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", 518955f14b4SBjorn Helgaas acpi_format_exception(status)); 519955f14b4SBjorn Helgaas 5203e43abb0SBjorn Helgaas /* 5213e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5223e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5233e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5243e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5253e43abb0SBjorn Helgaas * root scan. 5263e43abb0SBjorn Helgaas */ 5273e43abb0SBjorn Helgaas *no_aspm = 1; 5283e43abb0SBjorn Helgaas } 5293e43abb0SBjorn Helgaas } 5303e43abb0SBjorn Helgaas 53100c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 53200c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5331da177e4SLinus Torvalds { 534f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 535f5eebbe1SBjorn Helgaas acpi_status status; 536f5eebbe1SBjorn Helgaas int result; 537f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 538bfe2414aSJiang Liu acpi_handle handle = device->handle; 539387d3757SMatthew Garrett int no_aspm = 0; 5409762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 541c238252fSSinan Kaya bool is_pcie; 5421da177e4SLinus Torvalds 5436ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5446ad95513SBjorn Helgaas if (!root) 5456ad95513SBjorn Helgaas return -ENOMEM; 5466ad95513SBjorn Helgaas 547f5eebbe1SBjorn Helgaas segment = 0; 548bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 549f5eebbe1SBjorn Helgaas &segment); 550f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5516dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5526ad95513SBjorn Helgaas result = -ENODEV; 5536ad95513SBjorn Helgaas goto end; 554f5eebbe1SBjorn Helgaas } 5551da177e4SLinus Torvalds 556f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5576ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 558bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 559f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5606ad95513SBjorn Helgaas /* 5616ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5626ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5636ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5646ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5656ad95513SBjorn Helgaas */ 5666ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5676dc7d22cSJiang Liu dev_warn(&device->dev, 5686dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 569bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 570e545b55aSJon Mason NULL, &bus); 5716ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5726ad95513SBjorn Helgaas root->secondary.start = bus; 5736ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5746ad95513SBjorn Helgaas root->secondary.start = 0; 5756ad95513SBjorn Helgaas else { 5766dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5776ad95513SBjorn Helgaas result = -ENODEV; 5786ad95513SBjorn Helgaas goto end; 579f5eebbe1SBjorn Helgaas } 580f5eebbe1SBjorn Helgaas } 5811da177e4SLinus Torvalds 58232917e5bSPatrick Mochel root->device = device; 5830705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5841da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5851da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 586db89b4f0SPavel Machek device->driver_data = root; 5871da177e4SLinus Torvalds 588864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 589864b94adSJiang Liu result = -ENXIO; 590864b94adSJiang Liu goto end; 591864b94adSJiang Liu } 592864b94adSJiang Liu 593ccde83e3SHanjun Guo pr_info("%s [%s] (domain %04x %pR)\n", 594d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 595d4761ba2SBjorn Helgaas root->segment, &root->secondary); 596d4761ba2SBjorn Helgaas 597bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 598f4b57a3bSJiang Liu 599c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 600c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 601415e12b2SRafael J. Wysocki 6023dc48af3SNeil Horman /* 6033dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 6043dc48af3SNeil Horman */ 6053dc48af3SNeil Horman 6063dc48af3SNeil Horman /* 6073dc48af3SNeil Horman * Scan the Root Bridge 6083dc48af3SNeil Horman * -------------------- 6093dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 6103dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 6113dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 6123dc48af3SNeil Horman */ 6133dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 6143dc48af3SNeil Horman if (!root->bus) { 6153dc48af3SNeil Horman dev_err(&device->dev, 6163dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6173dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 618f516bde5SRafael J. Wysocki device->driver_data = NULL; 6193dc48af3SNeil Horman result = -ENODEV; 620864b94adSJiang Liu goto remove_dmar; 6213dc48af3SNeil Horman } 6223dc48af3SNeil Horman 6233dc48af3SNeil Horman if (no_aspm) 6243dc48af3SNeil Horman pcie_no_aspm(); 6253dc48af3SNeil Horman 626c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 627de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 628b67ea761SRafael J. Wysocki 629864b94adSJiang Liu if (hotadd) { 6303c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 63139772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 632584c5c42SRui Wang /* 633584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 634584c5c42SRui Wang * case, we need to wait until after PCI initialization in 635584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 636584c5c42SRui Wang * 637584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 638584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 639584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 640584c5c42SRui Wang * (see drivers/acpi/Kconfig). 641584c5c42SRui Wang */ 642fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 643516ca223SJiang Liu } 64462a08c5aSYinghai Lu 6457a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 646c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6477a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 64800c43b96SRafael J. Wysocki return 1; 64947525cdaSRafael J. Wysocki 650864b94adSJiang Liu remove_dmar: 651864b94adSJiang Liu if (hotadd) 652864b94adSJiang Liu dmar_device_remove(handle); 65347525cdaSRafael J. Wysocki end: 65447525cdaSRafael J. Wysocki kfree(root); 65547525cdaSRafael J. Wysocki return result; 656c431ada4SRajesh Shah } 6571da177e4SLinus Torvalds 65800c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6591da177e4SLinus Torvalds { 660caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 661c8e9afb1SJiang Liu 6627a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6637a3bb55eSRafael J. Wysocki 6649738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6659738a1fdSYinghai Lu 666f2ae5da7SRui Wang pci_ioapic_remove(root); 667de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 668b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 669b67ea761SRafael J. Wysocki 6709738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 671f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6729738a1fdSYinghai Lu 673864b94adSJiang Liu dmar_device_remove(device->handle); 674864b94adSJiang Liu 6757a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6767a3bb55eSRafael J. Wysocki 6771da177e4SLinus Torvalds kfree(root); 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds 6802c204383SJiang Liu /* 6812c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6822c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6832c204383SJiang Liu * and ARM64. 6842c204383SJiang Liu */ 6852c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6862c204383SJiang Liu struct list_head *resources, 6872c204383SJiang Liu unsigned long type) 6882c204383SJiang Liu { 6892c204383SJiang Liu LIST_HEAD(list); 6902c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6912c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6922c204383SJiang Liu 6932c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6942c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6952c204383SJiang Liu 6962c204383SJiang Liu list_splice_init(resources, &list); 6972c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6982c204383SJiang Liu bool free = false; 6992c204383SJiang Liu resource_size_t end; 7002c204383SJiang Liu 7012c204383SJiang Liu res1 = entry->res; 7022c204383SJiang Liu if (!(res1->flags & type)) 7032c204383SJiang Liu goto next; 7042c204383SJiang Liu 7052c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 7062c204383SJiang Liu end = min(res1->end, root->end); 7072c204383SJiang Liu if (end <= res1->start) { 7082c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 7092c204383SJiang Liu res1); 7102c204383SJiang Liu free = true; 7112c204383SJiang Liu goto next; 7122c204383SJiang Liu } else if (res1->end != end) { 7132c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 7142c204383SJiang Liu res1, (unsigned long long)end + 1, 7152c204383SJiang Liu (unsigned long long)res1->end); 7162c204383SJiang Liu res1->end = end; 7172c204383SJiang Liu } 7182c204383SJiang Liu 7192c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7202c204383SJiang Liu res2 = entry2->res; 7212c204383SJiang Liu if (!(res2->flags & type)) 7222c204383SJiang Liu continue; 7232c204383SJiang Liu 7242c204383SJiang Liu /* 7252c204383SJiang Liu * I don't like throwing away windows because then 7262c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7272c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7282c204383SJiang Liu */ 72907aec68eSAndy Shevchenko if (resource_union(res1, res2, res2)) { 7302c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7312c204383SJiang Liu res2, res1); 7322c204383SJiang Liu free = true; 7332c204383SJiang Liu goto next; 7342c204383SJiang Liu } 7352c204383SJiang Liu } 7362c204383SJiang Liu 7372c204383SJiang Liu next: 7382c204383SJiang Liu resource_list_del(entry); 7392c204383SJiang Liu if (free) 7402c204383SJiang Liu resource_list_free_entry(entry); 7412c204383SJiang Liu else 7422c204383SJiang Liu resource_list_add_tail(entry, resources); 7432c204383SJiang Liu } 7442c204383SJiang Liu } 7452c204383SJiang Liu 746fcfaab30SGabriele Paoloni static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, 747fcfaab30SGabriele Paoloni struct resource_entry *entry) 7480a70abb3SJayachandran C { 7490a70abb3SJayachandran C #ifdef PCI_IOBASE 7500a70abb3SJayachandran C struct resource *res = entry->res; 7510a70abb3SJayachandran C resource_size_t cpu_addr = res->start; 7520a70abb3SJayachandran C resource_size_t pci_addr = cpu_addr - entry->offset; 7530a70abb3SJayachandran C resource_size_t length = resource_size(res); 7540a70abb3SJayachandran C unsigned long port; 7550a70abb3SJayachandran C 756fcfaab30SGabriele Paoloni if (pci_register_io_range(fwnode, cpu_addr, length)) 7570a70abb3SJayachandran C goto err; 7580a70abb3SJayachandran C 7590a70abb3SJayachandran C port = pci_address_to_pio(cpu_addr); 7600a70abb3SJayachandran C if (port == (unsigned long)-1) 7610a70abb3SJayachandran C goto err; 7620a70abb3SJayachandran C 7630a70abb3SJayachandran C res->start = port; 7640a70abb3SJayachandran C res->end = port + length - 1; 7650a70abb3SJayachandran C entry->offset = port - pci_addr; 7660a70abb3SJayachandran C 7670a70abb3SJayachandran C if (pci_remap_iospace(res, cpu_addr) < 0) 7680a70abb3SJayachandran C goto err; 7690a70abb3SJayachandran C 7700a70abb3SJayachandran C pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); 7710a70abb3SJayachandran C return; 7720a70abb3SJayachandran C err: 7730a70abb3SJayachandran C res->flags |= IORESOURCE_DISABLED; 7740a70abb3SJayachandran C #endif 7750a70abb3SJayachandran C } 7760a70abb3SJayachandran C 7772c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7782c204383SJiang Liu { 7792c204383SJiang Liu int ret; 7802c204383SJiang Liu struct list_head *list = &info->resources; 7812c204383SJiang Liu struct acpi_device *device = info->bridge; 7822c204383SJiang Liu struct resource_entry *entry, *tmp; 7832c204383SJiang Liu unsigned long flags; 7842c204383SJiang Liu 7852c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7862c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7872c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7882c204383SJiang Liu (void *)flags); 7892c204383SJiang Liu if (ret < 0) 7902c204383SJiang Liu dev_warn(&device->dev, 7912c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7922c204383SJiang Liu else if (ret == 0) 7932c204383SJiang Liu dev_dbg(&device->dev, 7942c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 7952c204383SJiang Liu else { 7962c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 7970a70abb3SJayachandran C if (entry->res->flags & IORESOURCE_IO) 798fcfaab30SGabriele Paoloni acpi_pci_root_remap_iospace(&device->fwnode, 799fcfaab30SGabriele Paoloni entry); 8000a70abb3SJayachandran C 8012c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 8022c204383SJiang Liu resource_list_destroy_entry(entry); 8032c204383SJiang Liu else 8042c204383SJiang Liu entry->res->name = info->name; 8052c204383SJiang Liu } 8062c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8072c204383SJiang Liu IORESOURCE_MEM); 8082c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8092c204383SJiang Liu IORESOURCE_IO); 8102c204383SJiang Liu } 8112c204383SJiang Liu 8122c204383SJiang Liu return ret; 8132c204383SJiang Liu } 8142c204383SJiang Liu 8152c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 8162c204383SJiang Liu { 8172c204383SJiang Liu struct resource_entry *entry, *tmp; 8182c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 8192c204383SJiang Liu 8202c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8212c204383SJiang Liu res = entry->res; 8222c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 8232c204383SJiang Liu root = &iomem_resource; 8242c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 8252c204383SJiang Liu root = &ioport_resource; 8262c204383SJiang Liu else 8272c204383SJiang Liu continue; 8282c204383SJiang Liu 829727ae8beSLiu Jiang /* 830727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 831727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 832727ae8beSLiu Jiang */ 833727ae8beSLiu Jiang if (res == root) 834727ae8beSLiu Jiang continue; 835727ae8beSLiu Jiang 8362c204383SJiang Liu conflict = insert_resource_conflict(root, res); 8372c204383SJiang Liu if (conflict) { 8382c204383SJiang Liu dev_info(&info->bridge->dev, 8392c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 8402c204383SJiang Liu res, conflict->name, conflict); 8412c204383SJiang Liu resource_list_destroy_entry(entry); 8422c204383SJiang Liu } 8432c204383SJiang Liu } 8442c204383SJiang Liu } 8452c204383SJiang Liu 8462c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 8472c204383SJiang Liu { 8482c204383SJiang Liu struct resource *res; 8492c204383SJiang Liu struct resource_entry *entry, *tmp; 8502c204383SJiang Liu 8512c204383SJiang Liu if (!info) 8522c204383SJiang Liu return; 8532c204383SJiang Liu 8542c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8552c204383SJiang Liu res = entry->res; 8562c204383SJiang Liu if (res->parent && 8572c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8582c204383SJiang Liu release_resource(res); 8592c204383SJiang Liu resource_list_destroy_entry(entry); 8602c204383SJiang Liu } 8612c204383SJiang Liu 8622c204383SJiang Liu info->ops->release_info(info); 8632c204383SJiang Liu } 8642c204383SJiang Liu 8652c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8662c204383SJiang Liu { 8672c204383SJiang Liu struct resource *res; 8682c204383SJiang Liu struct resource_entry *entry; 8692c204383SJiang Liu 8702c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8712c204383SJiang Liu res = entry->res; 8720a70abb3SJayachandran C if (res->flags & IORESOURCE_IO) 8730a70abb3SJayachandran C pci_unmap_iospace(res); 8742c204383SJiang Liu if (res->parent && 8752c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8762c204383SJiang Liu release_resource(res); 8772c204383SJiang Liu } 8782c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8792c204383SJiang Liu } 8802c204383SJiang Liu 8812c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8822c204383SJiang Liu struct acpi_pci_root_ops *ops, 8832c204383SJiang Liu struct acpi_pci_root_info *info, 8842c204383SJiang Liu void *sysdata) 8852c204383SJiang Liu { 8862c204383SJiang Liu int ret, busnum = root->secondary.start; 8872c204383SJiang Liu struct acpi_device *device = root->device; 8882c204383SJiang Liu int node = acpi_get_node(device->handle); 8892c204383SJiang Liu struct pci_bus *bus; 89002bfeb48SBjorn Helgaas struct pci_host_bridge *host_bridge; 891a78cf965SBenjamin Herrenschmidt union acpi_object *obj; 8922c204383SJiang Liu 8932c204383SJiang Liu info->root = root; 8942c204383SJiang Liu info->bridge = device; 8952c204383SJiang Liu info->ops = ops; 8962c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8972c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8982c204383SJiang Liu root->segment, busnum); 8992c204383SJiang Liu 9002c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 9012c204383SJiang Liu goto out_release_info; 9022c204383SJiang Liu if (ops->prepare_resources) 9032c204383SJiang Liu ret = ops->prepare_resources(info); 9042c204383SJiang Liu else 9052c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 9062c204383SJiang Liu if (ret < 0) 9072c204383SJiang Liu goto out_release_info; 9082c204383SJiang Liu 9092c204383SJiang Liu pci_acpi_root_add_resources(info); 9102c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 9112c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 9122c204383SJiang Liu sysdata, &info->resources); 9132c204383SJiang Liu if (!bus) 9142c204383SJiang Liu goto out_release_info; 9152c204383SJiang Liu 91602bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 91702bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9189310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9191df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9201df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 92102bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 92202bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 92302bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 92402bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 925af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 926af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 927ac1c8e35SKuppuswamy Sathyanarayanan if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) 928ac1c8e35SKuppuswamy Sathyanarayanan host_bridge->native_dpc = 0; 92902bfeb48SBjorn Helgaas 930a78cf965SBenjamin Herrenschmidt /* 931a78cf965SBenjamin Herrenschmidt * Evaluate the "PCI Boot Configuration" _DSM Function. If it 932a78cf965SBenjamin Herrenschmidt * exists and returns 0, we must preserve any PCI resource 933a78cf965SBenjamin Herrenschmidt * assignments made by firmware for this host bridge. 934a78cf965SBenjamin Herrenschmidt */ 935a78cf965SBenjamin Herrenschmidt obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, 9363910ebacSKrzysztof Wilczyński DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); 937a78cf965SBenjamin Herrenschmidt if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) 938a78cf965SBenjamin Herrenschmidt host_bridge->preserve_config = 1; 939a78cf965SBenjamin Herrenschmidt ACPI_FREE(obj); 940a78cf965SBenjamin Herrenschmidt 9412c204383SJiang Liu pci_scan_child_bus(bus); 94202bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 94302bfeb48SBjorn Helgaas info); 9442c204383SJiang Liu if (node != NUMA_NO_NODE) 9452c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9462c204383SJiang Liu return bus; 9472c204383SJiang Liu 9482c204383SJiang Liu out_release_info: 9492c204383SJiang Liu __acpi_pci_root_release_info(info); 9502c204383SJiang Liu return NULL; 9512c204383SJiang Liu } 9522c204383SJiang Liu 95300c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9541da177e4SLinus Torvalds { 955d3072e6aSRafael J. Wysocki acpi_hest_init(); 9563338db00SRafael J. Wysocki if (acpi_pci_disabled) 9573338db00SRafael J. Wysocki return; 958d3072e6aSRafael J. Wysocki 9597bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9603338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 961668192b6SYinghai Lu } 962