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 91da177e4SLinus Torvalds #include <linux/kernel.h> 101da177e4SLinus Torvalds #include <linux/module.h> 111da177e4SLinus Torvalds #include <linux/init.h> 121da177e4SLinus Torvalds #include <linux/types.h> 13d0020f65STaku Izumi #include <linux/mutex.h> 141da177e4SLinus Torvalds #include <linux/pm.h> 15b67ea761SRafael J. Wysocki #include <linux/pm_runtime.h> 161da177e4SLinus Torvalds #include <linux/pci.h> 17990a7ac5SAndrew Patterson #include <linux/pci-acpi.h> 18864b94adSJiang Liu #include <linux/dmar.h> 191da177e4SLinus Torvalds #include <linux/acpi.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 217bc5a2baSMatthew Garrett #include <linux/dmi.h> 22630b3affSLukas Wunner #include <linux/platform_data/x86/apple.h> 238b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 241da177e4SLinus Torvalds 25ace8238bSRafael J. Wysocki #include "internal.h" 26ace8238bSRafael J. Wysocki 271da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 281da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 2900c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 3000c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 3100c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 321da177e4SLinus Torvalds 333338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 343338db00SRafael J. Wysocki { 351f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 363338db00SRafael J. Wysocki return 0; 373338db00SRafael J. Wysocki } 383338db00SRafael J. Wysocki 397dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 407dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 417dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 427dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 43415e12b2SRafael J. Wysocki 44c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 451ba90e3aSThomas Renninger {"PNP0A03", 0}, 461ba90e3aSThomas Renninger {"", 0}, 471ba90e3aSThomas Renninger }; 481ba90e3aSThomas Renninger 4900c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 501ba90e3aSThomas Renninger .ids = root_device_ids, 5100c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 5200c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 53ca499fc8SToshi Kani .hotplug = { 543338db00SRafael J. Wysocki .enabled = true, 553338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 56ca499fc8SToshi Kani }, 571da177e4SLinus Torvalds }; 581da177e4SLinus Torvalds 5927558203SAlexander Chiang /** 6027558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 618e8883ceSTian Tao * @handle: the ACPI CA node in question. 6227558203SAlexander Chiang * 6327558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6427558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 6527558203SAlexander Chiang */ 6627558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 6727558203SAlexander Chiang { 6827558203SAlexander Chiang int ret; 6927558203SAlexander Chiang struct acpi_device *device; 7027558203SAlexander Chiang 7127558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 7227558203SAlexander Chiang if (ret) 7327558203SAlexander Chiang return 0; 7427558203SAlexander Chiang 7527558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 7627558203SAlexander Chiang if (ret) 7727558203SAlexander Chiang return 0; 7827558203SAlexander Chiang else 7927558203SAlexander Chiang return 1; 8027558203SAlexander Chiang } 8127558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8227558203SAlexander Chiang 831da177e4SLinus Torvalds static acpi_status 841da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 851da177e4SLinus Torvalds { 866ad95513SBjorn Helgaas struct resource *res = data; 871da177e4SLinus Torvalds struct acpi_resource_address64 address; 88f6c1c8ffSBjorn Helgaas acpi_status status; 891da177e4SLinus Torvalds 90f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 91f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 921da177e4SLinus Torvalds return AE_OK; 931da177e4SLinus Torvalds 94a45de93eSLv Zheng if ((address.address.address_length > 0) && 956ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 96a45de93eSLv Zheng res->start = address.address.minimum; 97a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 986ad95513SBjorn Helgaas } 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds return AE_OK; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 103f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1046ad95513SBjorn Helgaas struct resource *res) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds acpi_status status; 1071da177e4SLinus Torvalds 1086ad95513SBjorn Helgaas res->start = -1; 1094be44fcdSLen Brown status = 1104be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1116ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1121da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1131da177e4SLinus Torvalds return status; 1146ad95513SBjorn Helgaas if (res->start == -1) 1151da177e4SLinus Torvalds return AE_ERROR; 1161da177e4SLinus Torvalds return AE_OK; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 119955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 120955f14b4SBjorn Helgaas u32 bit; 121955f14b4SBjorn Helgaas char *desc; 122955f14b4SBjorn Helgaas }; 123955f14b4SBjorn Helgaas 124955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 125955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 126955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 127955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 128955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 129955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 130ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EDR_SUPPORT, "EDR" }, 131ba11edc6SAlexandru Gagniuc { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, 132955f14b4SBjorn Helgaas }; 133955f14b4SBjorn Helgaas 134955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 135955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 136955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 137955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 138955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 139955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 140af8bb9f8SBjorn Helgaas { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, 141ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, 142955f14b4SBjorn Helgaas }; 143955f14b4SBjorn Helgaas 144955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 145955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 146955f14b4SBjorn Helgaas { 147955f14b4SBjorn Helgaas char buf[80]; 148955f14b4SBjorn Helgaas int i, len = 0; 149955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 150955f14b4SBjorn Helgaas 151955f14b4SBjorn Helgaas buf[0] = '\0'; 152955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 153955f14b4SBjorn Helgaas if (word & entry->bit) 154edd66086STakashi Iwai len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", 155955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 156955f14b4SBjorn Helgaas 157955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 158955f14b4SBjorn Helgaas } 159955f14b4SBjorn Helgaas 160955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 161955f14b4SBjorn Helgaas { 162955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 163955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 164955f14b4SBjorn Helgaas } 165955f14b4SBjorn Helgaas 166955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 167955f14b4SBjorn Helgaas { 168955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 169955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 170955f14b4SBjorn Helgaas } 171955f14b4SBjorn Helgaas 1723a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17363f10f0fSKenji Kaneshige 17463f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17563f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 17663f10f0fSKenji Kaneshige { 1773a9622dcSShaohua Li struct acpi_osc_context context = { 1783a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1793a9622dcSShaohua Li .rev = 1, 1803a9622dcSShaohua Li .cap.length = 12, 1813a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1823a9622dcSShaohua Li }; 18363f10f0fSKenji Kaneshige acpi_status status; 18463f10f0fSKenji Kaneshige 1853a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1863a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1873a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1883a9622dcSShaohua Li kfree(context.ret.pointer); 18963f10f0fSKenji Kaneshige } 19063f10f0fSKenji Kaneshige return status; 19163f10f0fSKenji Kaneshige } 19263f10f0fSKenji Kaneshige 193ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 194ab8e8957SRafael J. Wysocki u32 support, 195ab8e8957SRafael J. Wysocki u32 *control) 19663f10f0fSKenji Kaneshige { 19763f10f0fSKenji Kaneshige acpi_status status; 198ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 19963f10f0fSKenji Kaneshige 200ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 201ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 202ab8e8957SRafael J. Wysocki 203b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 204b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 205ab8e8957SRafael J. Wysocki if (control) { 206ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 207b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 208ab8e8957SRafael J. Wysocki } else { 209545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 210b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 211ab8e8957SRafael J. Wysocki } 21263f10f0fSKenji Kaneshige 21363f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 21463f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 215ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2162b8fd918SRafael J. Wysocki if (control) 217ab8e8957SRafael J. Wysocki *control = result; 218ab8e8957SRafael J. Wysocki } 21963f10f0fSKenji Kaneshige return status; 22063f10f0fSKenji Kaneshige } 22163f10f0fSKenji Kaneshige 22263f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 22363f10f0fSKenji Kaneshige { 224*866e61fcSBjorn Helgaas return acpi_pci_query_osc(root, flags, NULL); 22563f10f0fSKenji Kaneshige } 22663f10f0fSKenji Kaneshige 22776d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 22863f10f0fSKenji Kaneshige { 22963f10f0fSKenji Kaneshige struct acpi_pci_root *root; 230cd4faf9cSTaku Izumi struct acpi_device *device; 231c1aec834SBjorn Helgaas 232cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 233cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 23463f10f0fSKenji Kaneshige return NULL; 235cd4faf9cSTaku Izumi 236cd4faf9cSTaku Izumi root = acpi_driver_data(device); 237cd4faf9cSTaku Izumi 238cd4faf9cSTaku Izumi return root; 23963f10f0fSKenji Kaneshige } 24076d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 24163f10f0fSKenji Kaneshige 2422f7bbcebSAlexander Chiang struct acpi_handle_node { 2432f7bbcebSAlexander Chiang struct list_head node; 2442f7bbcebSAlexander Chiang acpi_handle handle; 2452f7bbcebSAlexander Chiang }; 2462f7bbcebSAlexander Chiang 2472f7bbcebSAlexander Chiang /** 2482f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2492f7bbcebSAlexander Chiang * @handle: the handle in question 2502f7bbcebSAlexander Chiang * 2512f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2522f7bbcebSAlexander Chiang * list of PCI devices. 2532f7bbcebSAlexander Chiang * 2542f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2552f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2562f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2572f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2582f7bbcebSAlexander Chiang */ 2592f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2602f7bbcebSAlexander Chiang { 2612f7bbcebSAlexander Chiang int dev, fn; 2622f7bbcebSAlexander Chiang unsigned long long adr; 2632f7bbcebSAlexander Chiang acpi_status status; 2642f7bbcebSAlexander Chiang acpi_handle phandle; 2652f7bbcebSAlexander Chiang struct pci_bus *pbus; 2662f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2672f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2682f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2692f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2702f7bbcebSAlexander Chiang 2712f7bbcebSAlexander Chiang /* 2722f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2732f7bbcebSAlexander Chiang */ 2742f7bbcebSAlexander Chiang phandle = handle; 2752f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2762f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2772f7bbcebSAlexander Chiang if (!node) 2782f7bbcebSAlexander Chiang goto out; 2792f7bbcebSAlexander Chiang 2802f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2812f7bbcebSAlexander Chiang node->handle = phandle; 2822f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2832f7bbcebSAlexander Chiang 2842f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2852f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2862f7bbcebSAlexander Chiang goto out; 2872f7bbcebSAlexander Chiang } 2882f7bbcebSAlexander Chiang 2892f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2902f7bbcebSAlexander Chiang if (!root) 2912f7bbcebSAlexander Chiang goto out; 2922f7bbcebSAlexander Chiang 2932f7bbcebSAlexander Chiang pbus = root->bus; 2942f7bbcebSAlexander Chiang 2952f7bbcebSAlexander Chiang /* 2962f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 2972f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 2982f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 2992f7bbcebSAlexander Chiang */ 3002f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3012f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3022f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3032f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3042f7bbcebSAlexander Chiang goto out; 3052f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3062f7bbcebSAlexander Chiang fn = adr & 0xffff; 3072f7bbcebSAlexander Chiang 3082f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 309412af978STroy Moure if (!pdev || hnd == handle) 3102f7bbcebSAlexander Chiang break; 3112f7bbcebSAlexander Chiang 3122f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3132f7bbcebSAlexander Chiang pci_dev_put(pdev); 314497fb54fSRafael J. Wysocki 315497fb54fSRafael J. Wysocki /* 316497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 317497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 318497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 319497fb54fSRafael J. Wysocki */ 320497fb54fSRafael J. Wysocki if (!pbus) { 321497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 322497fb54fSRafael J. Wysocki pdev = NULL; 323497fb54fSRafael J. Wysocki break; 324497fb54fSRafael J. Wysocki } 3252f7bbcebSAlexander Chiang } 3262f7bbcebSAlexander Chiang out: 3272f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3282f7bbcebSAlexander Chiang kfree(node); 3292f7bbcebSAlexander Chiang 3302f7bbcebSAlexander Chiang return pdev; 3312f7bbcebSAlexander Chiang } 3322f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3332f7bbcebSAlexander Chiang 33463f10f0fSKenji Kaneshige /** 33575fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 33675fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 33775fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 33875fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 33963f10f0fSKenji Kaneshige * 34075fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 34175fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 34275fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 34375fb60f2SRafael J. Wysocki * 34475fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 34575fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 34675fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 34775fb60f2SRafael J. Wysocki * on failure. 34863f10f0fSKenji Kaneshige **/ 3491423de71SBjorn Helgaas static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 35063f10f0fSKenji Kaneshige { 35163f10f0fSKenji Kaneshige struct acpi_pci_root *root; 352*866e61fcSBjorn Helgaas acpi_status status; 35375fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 35463f10f0fSKenji Kaneshige 35575fb60f2SRafael J. Wysocki if (!mask) 35675fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 35775fb60f2SRafael J. Wysocki 35875fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 35975fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 36063f10f0fSKenji Kaneshige return AE_TYPE; 36163f10f0fSKenji Kaneshige 36263f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 36363f10f0fSKenji Kaneshige if (!root) 36463f10f0fSKenji Kaneshige return AE_NOT_EXIST; 36563f10f0fSKenji Kaneshige 36675fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 36763f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 36875fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 369*866e61fcSBjorn Helgaas return AE_OK; 37063f10f0fSKenji Kaneshige 37175fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 37275fb60f2SRafael J. Wysocki while (*mask) { 37375fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 37463f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 375*866e61fcSBjorn Helgaas return status; 37675fb60f2SRafael J. Wysocki if (ctrl == *mask) 37775fb60f2SRafael J. Wysocki break; 378955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 379955f14b4SBjorn Helgaas ctrl & ~(*mask)); 38075fb60f2SRafael J. Wysocki ctrl = *mask; 38175fb60f2SRafael J. Wysocki } 3822b8fd918SRafael J. Wysocki 38375fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 384955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 385955f14b4SBjorn Helgaas req & ~(ctrl)); 386*866e61fcSBjorn Helgaas return AE_SUPPORT; 38763f10f0fSKenji Kaneshige } 38863f10f0fSKenji Kaneshige 389b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 390b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 391b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 39275fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 393*866e61fcSBjorn Helgaas if (ACPI_FAILURE(status)) 39463f10f0fSKenji Kaneshige return status; 395*866e61fcSBjorn Helgaas 396*866e61fcSBjorn Helgaas root->osc_control_set = *mask; 397*866e61fcSBjorn Helgaas return AE_OK; 39863f10f0fSKenji Kaneshige } 39963f10f0fSKenji Kaneshige 400c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 401c238252fSSinan Kaya bool is_pcie) 4023e43abb0SBjorn Helgaas { 403955f14b4SBjorn Helgaas u32 support, control, requested; 4043e43abb0SBjorn Helgaas acpi_status status; 4053e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4063e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4073e43abb0SBjorn Helgaas 4083e43abb0SBjorn Helgaas /* 4097bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4107bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4117bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4127bc5a2baSMatthew Garrett */ 413630b3affSLukas Wunner if (x86_apple_machine) { 4147bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4157bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4167bc5a2baSMatthew Garrett root->osc_control_set); 4177bc5a2baSMatthew Garrett return; 4187bc5a2baSMatthew Garrett } 4197bc5a2baSMatthew Garrett 4207bc5a2baSMatthew Garrett /* 4213e43abb0SBjorn Helgaas * All supported architectures that use ACPI have support for 4223e43abb0SBjorn Helgaas * PCI domains, so we indicate this in _OSC support capabilities. 4233e43abb0SBjorn Helgaas */ 42465afe916SBjorn Helgaas support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 425ba11edc6SAlexandru Gagniuc support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 4263e43abb0SBjorn Helgaas if (pci_ext_cfg_avail()) 427b8eb67fcSBjorn Helgaas support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4281b2a7be6SBjorn Helgaas if (pcie_aspm_support_enabled()) 429b8eb67fcSBjorn Helgaas support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4303e43abb0SBjorn Helgaas if (pci_msi_enabled()) 431b8eb67fcSBjorn Helgaas support |= OSC_PCI_MSI_SUPPORT; 432ac1c8e35SKuppuswamy Sathyanarayanan if (IS_ENABLED(CONFIG_PCIE_EDR)) 433ac1c8e35SKuppuswamy Sathyanarayanan support |= OSC_PCI_EDR_SUPPORT; 434955f14b4SBjorn Helgaas 435955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 436b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4373e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 438c238252fSSinan Kaya *no_aspm = 1; 439c238252fSSinan Kaya 440c238252fSSinan Kaya /* _OSC is optional for PCI host bridges */ 441c238252fSSinan Kaya if ((status == AE_NOT_FOUND) && !is_pcie) 442c238252fSSinan Kaya return; 443c238252fSSinan Kaya 4441ad61b61SSinan Kaya dev_info(&device->dev, "_OSC failed (%s)%s\n", 4451ad61b61SSinan Kaya acpi_format_exception(status), 4461ad61b61SSinan Kaya pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); 44765afe916SBjorn Helgaas return; 4483e43abb0SBjorn Helgaas } 4493e43abb0SBjorn Helgaas 45043613a1fSBjorn Helgaas if (pcie_ports_disabled) { 45143613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 45243613a1fSBjorn Helgaas return; 45343613a1fSBjorn Helgaas } 45443613a1fSBjorn Helgaas 455de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 456955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 457955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 458de189662SBjorn Helgaas return; 459de189662SBjorn Helgaas } 460de189662SBjorn Helgaas 461b8eb67fcSBjorn Helgaas control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4623e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_PME_CONTROL; 4633e43abb0SBjorn Helgaas 464af8bb9f8SBjorn Helgaas if (IS_ENABLED(CONFIG_PCIEASPM)) 465af8bb9f8SBjorn Helgaas control |= OSC_PCI_EXPRESS_LTR_CONTROL; 466af8bb9f8SBjorn Helgaas 467408fec36SMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 468408fec36SMika Westerberg control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 469408fec36SMika Westerberg 4701df81a6dSMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 4711df81a6dSMika Westerberg control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 4721df81a6dSMika Westerberg 473c100beb9SAlexandru Gagniuc if (pci_aer_available()) 474b8eb67fcSBjorn Helgaas control |= OSC_PCI_EXPRESS_AER_CONTROL; 4753e43abb0SBjorn Helgaas 476ac1c8e35SKuppuswamy Sathyanarayanan /* 477ac1c8e35SKuppuswamy Sathyanarayanan * Per the Downstream Port Containment Related Enhancements ECN to 478ac1c8e35SKuppuswamy Sathyanarayanan * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, 479ac1c8e35SKuppuswamy Sathyanarayanan * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC 480ac1c8e35SKuppuswamy Sathyanarayanan * and EDR. 481ac1c8e35SKuppuswamy Sathyanarayanan */ 482ac1c8e35SKuppuswamy Sathyanarayanan if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) 483ac1c8e35SKuppuswamy Sathyanarayanan control |= OSC_PCI_EXPRESS_DPC_CONTROL; 484ac1c8e35SKuppuswamy Sathyanarayanan 485955f14b4SBjorn Helgaas requested = control; 486b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 4873e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 4883e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 489955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 4903e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 4913e43abb0SBjorn Helgaas /* 492387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 493387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 494387d3757SMatthew Garrett * intact and prevent the OS from touching it. 4953e43abb0SBjorn Helgaas */ 496387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 497387d3757SMatthew Garrett *no_aspm = 1; 4983e43abb0SBjorn Helgaas } 4993e43abb0SBjorn Helgaas } else { 500955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 501955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 502955f14b4SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 503955f14b4SBjorn Helgaas acpi_format_exception(status)); 504955f14b4SBjorn Helgaas 5053e43abb0SBjorn Helgaas /* 5063e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5073e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5083e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5093e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5103e43abb0SBjorn Helgaas * root scan. 5113e43abb0SBjorn Helgaas */ 5123e43abb0SBjorn Helgaas *no_aspm = 1; 5133e43abb0SBjorn Helgaas } 5143e43abb0SBjorn Helgaas } 5153e43abb0SBjorn Helgaas 51600c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 51700c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5181da177e4SLinus Torvalds { 519f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 520f5eebbe1SBjorn Helgaas acpi_status status; 521f5eebbe1SBjorn Helgaas int result; 522f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 523bfe2414aSJiang Liu acpi_handle handle = device->handle; 524387d3757SMatthew Garrett int no_aspm = 0; 5259762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 526c238252fSSinan Kaya bool is_pcie; 5271da177e4SLinus Torvalds 5286ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5296ad95513SBjorn Helgaas if (!root) 5306ad95513SBjorn Helgaas return -ENOMEM; 5316ad95513SBjorn Helgaas 532f5eebbe1SBjorn Helgaas segment = 0; 533bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 534f5eebbe1SBjorn Helgaas &segment); 535f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5366dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5376ad95513SBjorn Helgaas result = -ENODEV; 5386ad95513SBjorn Helgaas goto end; 539f5eebbe1SBjorn Helgaas } 5401da177e4SLinus Torvalds 541f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5426ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 543bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 544f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5456ad95513SBjorn Helgaas /* 5466ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5476ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5486ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5496ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5506ad95513SBjorn Helgaas */ 5516ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5526dc7d22cSJiang Liu dev_warn(&device->dev, 5536dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 554bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 555e545b55aSJon Mason NULL, &bus); 5566ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5576ad95513SBjorn Helgaas root->secondary.start = bus; 5586ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5596ad95513SBjorn Helgaas root->secondary.start = 0; 5606ad95513SBjorn Helgaas else { 5616dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5626ad95513SBjorn Helgaas result = -ENODEV; 5636ad95513SBjorn Helgaas goto end; 564f5eebbe1SBjorn Helgaas } 565f5eebbe1SBjorn Helgaas } 5661da177e4SLinus Torvalds 56732917e5bSPatrick Mochel root->device = device; 5680705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5691da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5701da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 571db89b4f0SPavel Machek device->driver_data = root; 5721da177e4SLinus Torvalds 573864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 574864b94adSJiang Liu result = -ENXIO; 575864b94adSJiang Liu goto end; 576864b94adSJiang Liu } 577864b94adSJiang Liu 5786dc7d22cSJiang Liu pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", 579d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 580d4761ba2SBjorn Helgaas root->segment, &root->secondary); 581d4761ba2SBjorn Helgaas 582bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 583f4b57a3bSJiang Liu 584c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 585c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 586415e12b2SRafael J. Wysocki 5873dc48af3SNeil Horman /* 5883dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5893dc48af3SNeil Horman */ 5903dc48af3SNeil Horman 5913dc48af3SNeil Horman /* 5923dc48af3SNeil Horman * Scan the Root Bridge 5933dc48af3SNeil Horman * -------------------- 5943dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 5953dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 5963dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 5973dc48af3SNeil Horman */ 5983dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 5993dc48af3SNeil Horman if (!root->bus) { 6003dc48af3SNeil Horman dev_err(&device->dev, 6013dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6023dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 603f516bde5SRafael J. Wysocki device->driver_data = NULL; 6043dc48af3SNeil Horman result = -ENODEV; 605864b94adSJiang Liu goto remove_dmar; 6063dc48af3SNeil Horman } 6073dc48af3SNeil Horman 6083dc48af3SNeil Horman if (no_aspm) 6093dc48af3SNeil Horman pcie_no_aspm(); 6103dc48af3SNeil Horman 611c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 612de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 613b67ea761SRafael J. Wysocki 614864b94adSJiang Liu if (hotadd) { 6153c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 61639772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 617584c5c42SRui Wang /* 618584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 619584c5c42SRui Wang * case, we need to wait until after PCI initialization in 620584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 621584c5c42SRui Wang * 622584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 623584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 624584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 625584c5c42SRui Wang * (see drivers/acpi/Kconfig). 626584c5c42SRui Wang */ 627fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 628516ca223SJiang Liu } 62962a08c5aSYinghai Lu 6307a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 631c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6327a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 63300c43b96SRafael J. Wysocki return 1; 63447525cdaSRafael J. Wysocki 635864b94adSJiang Liu remove_dmar: 636864b94adSJiang Liu if (hotadd) 637864b94adSJiang Liu dmar_device_remove(handle); 63847525cdaSRafael J. Wysocki end: 63947525cdaSRafael J. Wysocki kfree(root); 64047525cdaSRafael J. Wysocki return result; 641c431ada4SRajesh Shah } 6421da177e4SLinus Torvalds 64300c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6441da177e4SLinus Torvalds { 645caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 646c8e9afb1SJiang Liu 6477a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6487a3bb55eSRafael J. Wysocki 6499738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6509738a1fdSYinghai Lu 651f2ae5da7SRui Wang pci_ioapic_remove(root); 652de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 653b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 654b67ea761SRafael J. Wysocki 6559738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 656f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6579738a1fdSYinghai Lu 658864b94adSJiang Liu dmar_device_remove(device->handle); 659864b94adSJiang Liu 6607a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6617a3bb55eSRafael J. Wysocki 6621da177e4SLinus Torvalds kfree(root); 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6652c204383SJiang Liu /* 6662c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6672c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6682c204383SJiang Liu * and ARM64. 6692c204383SJiang Liu */ 6702c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6712c204383SJiang Liu struct list_head *resources, 6722c204383SJiang Liu unsigned long type) 6732c204383SJiang Liu { 6742c204383SJiang Liu LIST_HEAD(list); 6752c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6762c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6772c204383SJiang Liu 6782c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6792c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6802c204383SJiang Liu 6812c204383SJiang Liu list_splice_init(resources, &list); 6822c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6832c204383SJiang Liu bool free = false; 6842c204383SJiang Liu resource_size_t end; 6852c204383SJiang Liu 6862c204383SJiang Liu res1 = entry->res; 6872c204383SJiang Liu if (!(res1->flags & type)) 6882c204383SJiang Liu goto next; 6892c204383SJiang Liu 6902c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 6912c204383SJiang Liu end = min(res1->end, root->end); 6922c204383SJiang Liu if (end <= res1->start) { 6932c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 6942c204383SJiang Liu res1); 6952c204383SJiang Liu free = true; 6962c204383SJiang Liu goto next; 6972c204383SJiang Liu } else if (res1->end != end) { 6982c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 6992c204383SJiang Liu res1, (unsigned long long)end + 1, 7002c204383SJiang Liu (unsigned long long)res1->end); 7012c204383SJiang Liu res1->end = end; 7022c204383SJiang Liu } 7032c204383SJiang Liu 7042c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7052c204383SJiang Liu res2 = entry2->res; 7062c204383SJiang Liu if (!(res2->flags & type)) 7072c204383SJiang Liu continue; 7082c204383SJiang Liu 7092c204383SJiang Liu /* 7102c204383SJiang Liu * I don't like throwing away windows because then 7112c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7122c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7132c204383SJiang Liu */ 71407aec68eSAndy Shevchenko if (resource_union(res1, res2, res2)) { 7152c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7162c204383SJiang Liu res2, res1); 7172c204383SJiang Liu free = true; 7182c204383SJiang Liu goto next; 7192c204383SJiang Liu } 7202c204383SJiang Liu } 7212c204383SJiang Liu 7222c204383SJiang Liu next: 7232c204383SJiang Liu resource_list_del(entry); 7242c204383SJiang Liu if (free) 7252c204383SJiang Liu resource_list_free_entry(entry); 7262c204383SJiang Liu else 7272c204383SJiang Liu resource_list_add_tail(entry, resources); 7282c204383SJiang Liu } 7292c204383SJiang Liu } 7302c204383SJiang Liu 731fcfaab30SGabriele Paoloni static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, 732fcfaab30SGabriele Paoloni struct resource_entry *entry) 7330a70abb3SJayachandran C { 7340a70abb3SJayachandran C #ifdef PCI_IOBASE 7350a70abb3SJayachandran C struct resource *res = entry->res; 7360a70abb3SJayachandran C resource_size_t cpu_addr = res->start; 7370a70abb3SJayachandran C resource_size_t pci_addr = cpu_addr - entry->offset; 7380a70abb3SJayachandran C resource_size_t length = resource_size(res); 7390a70abb3SJayachandran C unsigned long port; 7400a70abb3SJayachandran C 741fcfaab30SGabriele Paoloni if (pci_register_io_range(fwnode, cpu_addr, length)) 7420a70abb3SJayachandran C goto err; 7430a70abb3SJayachandran C 7440a70abb3SJayachandran C port = pci_address_to_pio(cpu_addr); 7450a70abb3SJayachandran C if (port == (unsigned long)-1) 7460a70abb3SJayachandran C goto err; 7470a70abb3SJayachandran C 7480a70abb3SJayachandran C res->start = port; 7490a70abb3SJayachandran C res->end = port + length - 1; 7500a70abb3SJayachandran C entry->offset = port - pci_addr; 7510a70abb3SJayachandran C 7520a70abb3SJayachandran C if (pci_remap_iospace(res, cpu_addr) < 0) 7530a70abb3SJayachandran C goto err; 7540a70abb3SJayachandran C 7550a70abb3SJayachandran C pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); 7560a70abb3SJayachandran C return; 7570a70abb3SJayachandran C err: 7580a70abb3SJayachandran C res->flags |= IORESOURCE_DISABLED; 7590a70abb3SJayachandran C #endif 7600a70abb3SJayachandran C } 7610a70abb3SJayachandran C 7622c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7632c204383SJiang Liu { 7642c204383SJiang Liu int ret; 7652c204383SJiang Liu struct list_head *list = &info->resources; 7662c204383SJiang Liu struct acpi_device *device = info->bridge; 7672c204383SJiang Liu struct resource_entry *entry, *tmp; 7682c204383SJiang Liu unsigned long flags; 7692c204383SJiang Liu 7702c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7712c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7722c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7732c204383SJiang Liu (void *)flags); 7742c204383SJiang Liu if (ret < 0) 7752c204383SJiang Liu dev_warn(&device->dev, 7762c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7772c204383SJiang Liu else if (ret == 0) 7782c204383SJiang Liu dev_dbg(&device->dev, 7792c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 7802c204383SJiang Liu else { 7812c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 7820a70abb3SJayachandran C if (entry->res->flags & IORESOURCE_IO) 783fcfaab30SGabriele Paoloni acpi_pci_root_remap_iospace(&device->fwnode, 784fcfaab30SGabriele Paoloni entry); 7850a70abb3SJayachandran C 7862c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 7872c204383SJiang Liu resource_list_destroy_entry(entry); 7882c204383SJiang Liu else 7892c204383SJiang Liu entry->res->name = info->name; 7902c204383SJiang Liu } 7912c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7922c204383SJiang Liu IORESOURCE_MEM); 7932c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7942c204383SJiang Liu IORESOURCE_IO); 7952c204383SJiang Liu } 7962c204383SJiang Liu 7972c204383SJiang Liu return ret; 7982c204383SJiang Liu } 7992c204383SJiang Liu 8002c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 8012c204383SJiang Liu { 8022c204383SJiang Liu struct resource_entry *entry, *tmp; 8032c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 8042c204383SJiang Liu 8052c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8062c204383SJiang Liu res = entry->res; 8072c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 8082c204383SJiang Liu root = &iomem_resource; 8092c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 8102c204383SJiang Liu root = &ioport_resource; 8112c204383SJiang Liu else 8122c204383SJiang Liu continue; 8132c204383SJiang Liu 814727ae8beSLiu Jiang /* 815727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 816727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 817727ae8beSLiu Jiang */ 818727ae8beSLiu Jiang if (res == root) 819727ae8beSLiu Jiang continue; 820727ae8beSLiu Jiang 8212c204383SJiang Liu conflict = insert_resource_conflict(root, res); 8222c204383SJiang Liu if (conflict) { 8232c204383SJiang Liu dev_info(&info->bridge->dev, 8242c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 8252c204383SJiang Liu res, conflict->name, conflict); 8262c204383SJiang Liu resource_list_destroy_entry(entry); 8272c204383SJiang Liu } 8282c204383SJiang Liu } 8292c204383SJiang Liu } 8302c204383SJiang Liu 8312c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 8322c204383SJiang Liu { 8332c204383SJiang Liu struct resource *res; 8342c204383SJiang Liu struct resource_entry *entry, *tmp; 8352c204383SJiang Liu 8362c204383SJiang Liu if (!info) 8372c204383SJiang Liu return; 8382c204383SJiang Liu 8392c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8402c204383SJiang Liu res = entry->res; 8412c204383SJiang Liu if (res->parent && 8422c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8432c204383SJiang Liu release_resource(res); 8442c204383SJiang Liu resource_list_destroy_entry(entry); 8452c204383SJiang Liu } 8462c204383SJiang Liu 8472c204383SJiang Liu info->ops->release_info(info); 8482c204383SJiang Liu } 8492c204383SJiang Liu 8502c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8512c204383SJiang Liu { 8522c204383SJiang Liu struct resource *res; 8532c204383SJiang Liu struct resource_entry *entry; 8542c204383SJiang Liu 8552c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8562c204383SJiang Liu res = entry->res; 8570a70abb3SJayachandran C if (res->flags & IORESOURCE_IO) 8580a70abb3SJayachandran C pci_unmap_iospace(res); 8592c204383SJiang Liu if (res->parent && 8602c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8612c204383SJiang Liu release_resource(res); 8622c204383SJiang Liu } 8632c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8642c204383SJiang Liu } 8652c204383SJiang Liu 8662c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8672c204383SJiang Liu struct acpi_pci_root_ops *ops, 8682c204383SJiang Liu struct acpi_pci_root_info *info, 8692c204383SJiang Liu void *sysdata) 8702c204383SJiang Liu { 8712c204383SJiang Liu int ret, busnum = root->secondary.start; 8722c204383SJiang Liu struct acpi_device *device = root->device; 8732c204383SJiang Liu int node = acpi_get_node(device->handle); 8742c204383SJiang Liu struct pci_bus *bus; 87502bfeb48SBjorn Helgaas struct pci_host_bridge *host_bridge; 876a78cf965SBenjamin Herrenschmidt union acpi_object *obj; 8772c204383SJiang Liu 8782c204383SJiang Liu info->root = root; 8792c204383SJiang Liu info->bridge = device; 8802c204383SJiang Liu info->ops = ops; 8812c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8822c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8832c204383SJiang Liu root->segment, busnum); 8842c204383SJiang Liu 8852c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 8862c204383SJiang Liu goto out_release_info; 8872c204383SJiang Liu if (ops->prepare_resources) 8882c204383SJiang Liu ret = ops->prepare_resources(info); 8892c204383SJiang Liu else 8902c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 8912c204383SJiang Liu if (ret < 0) 8922c204383SJiang Liu goto out_release_info; 8932c204383SJiang Liu 8942c204383SJiang Liu pci_acpi_root_add_resources(info); 8952c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 8962c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 8972c204383SJiang Liu sysdata, &info->resources); 8982c204383SJiang Liu if (!bus) 8992c204383SJiang Liu goto out_release_info; 9002c204383SJiang Liu 90102bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 90202bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9039310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9041df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9051df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 90602bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 90702bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 90802bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 90902bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 910af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 911af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 912ac1c8e35SKuppuswamy Sathyanarayanan if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) 913ac1c8e35SKuppuswamy Sathyanarayanan host_bridge->native_dpc = 0; 91402bfeb48SBjorn Helgaas 915a78cf965SBenjamin Herrenschmidt /* 916a78cf965SBenjamin Herrenschmidt * Evaluate the "PCI Boot Configuration" _DSM Function. If it 917a78cf965SBenjamin Herrenschmidt * exists and returns 0, we must preserve any PCI resource 918a78cf965SBenjamin Herrenschmidt * assignments made by firmware for this host bridge. 919a78cf965SBenjamin Herrenschmidt */ 920a78cf965SBenjamin Herrenschmidt obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, 9213910ebacSKrzysztof Wilczyński DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); 922a78cf965SBenjamin Herrenschmidt if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) 923a78cf965SBenjamin Herrenschmidt host_bridge->preserve_config = 1; 924a78cf965SBenjamin Herrenschmidt ACPI_FREE(obj); 925a78cf965SBenjamin Herrenschmidt 9262c204383SJiang Liu pci_scan_child_bus(bus); 92702bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 92802bfeb48SBjorn Helgaas info); 9292c204383SJiang Liu if (node != NUMA_NO_NODE) 9302c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9312c204383SJiang Liu return bus; 9322c204383SJiang Liu 9332c204383SJiang Liu out_release_info: 9342c204383SJiang Liu __acpi_pci_root_release_info(info); 9352c204383SJiang Liu return NULL; 9362c204383SJiang Liu } 9372c204383SJiang Liu 93800c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9391da177e4SLinus Torvalds { 940d3072e6aSRafael J. Wysocki acpi_hest_init(); 9413338db00SRafael J. Wysocki if (acpi_pci_disabled) 9423338db00SRafael J. Wysocki return; 943d3072e6aSRafael J. Wysocki 9447bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9453338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 946668192b6SYinghai Lu } 947