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 _COMPONENT ACPI_PCI_COMPONENT 28f52fd66dSLen Brown ACPI_MODULE_NAME("pci_root"); 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 6163f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 621da177e4SLinus Torvalds 6327558203SAlexander Chiang /** 6427558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 6527558203SAlexander Chiang * @handle - the ACPI CA node in question. 6627558203SAlexander Chiang * 6727558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6827558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 6927558203SAlexander Chiang */ 7027558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 7127558203SAlexander Chiang { 7227558203SAlexander Chiang int ret; 7327558203SAlexander Chiang struct acpi_device *device; 7427558203SAlexander Chiang 7527558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 7627558203SAlexander Chiang if (ret) 7727558203SAlexander Chiang return 0; 7827558203SAlexander Chiang 7927558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 8027558203SAlexander Chiang if (ret) 8127558203SAlexander Chiang return 0; 8227558203SAlexander Chiang else 8327558203SAlexander Chiang return 1; 8427558203SAlexander Chiang } 8527558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8627558203SAlexander Chiang 871da177e4SLinus Torvalds static acpi_status 881da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 891da177e4SLinus Torvalds { 906ad95513SBjorn Helgaas struct resource *res = data; 911da177e4SLinus Torvalds struct acpi_resource_address64 address; 92f6c1c8ffSBjorn Helgaas acpi_status status; 931da177e4SLinus Torvalds 94f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 95f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 961da177e4SLinus Torvalds return AE_OK; 971da177e4SLinus Torvalds 98a45de93eSLv Zheng if ((address.address.address_length > 0) && 996ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 100a45de93eSLv Zheng res->start = address.address.minimum; 101a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 1026ad95513SBjorn Helgaas } 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds return AE_OK; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 107f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1086ad95513SBjorn Helgaas struct resource *res) 1091da177e4SLinus Torvalds { 1101da177e4SLinus Torvalds acpi_status status; 1111da177e4SLinus Torvalds 1126ad95513SBjorn Helgaas res->start = -1; 1134be44fcdSLen Brown status = 1144be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1156ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1161da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1171da177e4SLinus Torvalds return status; 1186ad95513SBjorn Helgaas if (res->start == -1) 1191da177e4SLinus Torvalds return AE_ERROR; 1201da177e4SLinus Torvalds return AE_OK; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 123955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 124955f14b4SBjorn Helgaas u32 bit; 125955f14b4SBjorn Helgaas char *desc; 126955f14b4SBjorn Helgaas }; 127955f14b4SBjorn Helgaas 128955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 129955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 130955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 131955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 132955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 133955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 134ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EDR_SUPPORT, "EDR" }, 135ba11edc6SAlexandru Gagniuc { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, 136955f14b4SBjorn Helgaas }; 137955f14b4SBjorn Helgaas 138955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 139955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 140955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 141955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 142955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 143955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 144af8bb9f8SBjorn Helgaas { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, 145ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, 146955f14b4SBjorn Helgaas }; 147955f14b4SBjorn Helgaas 148955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 149955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 150955f14b4SBjorn Helgaas { 151955f14b4SBjorn Helgaas char buf[80]; 152955f14b4SBjorn Helgaas int i, len = 0; 153955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 154955f14b4SBjorn Helgaas 155955f14b4SBjorn Helgaas buf[0] = '\0'; 156955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 157955f14b4SBjorn Helgaas if (word & entry->bit) 158edd66086STakashi Iwai len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", 159955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 160955f14b4SBjorn Helgaas 161955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 162955f14b4SBjorn Helgaas } 163955f14b4SBjorn Helgaas 164955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 165955f14b4SBjorn Helgaas { 166955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 167955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 168955f14b4SBjorn Helgaas } 169955f14b4SBjorn Helgaas 170955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 171955f14b4SBjorn Helgaas { 172955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 173955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 174955f14b4SBjorn Helgaas } 175955f14b4SBjorn Helgaas 1763a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17763f10f0fSKenji Kaneshige 17863f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17963f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 18063f10f0fSKenji Kaneshige { 1813a9622dcSShaohua Li struct acpi_osc_context context = { 1823a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1833a9622dcSShaohua Li .rev = 1, 1843a9622dcSShaohua Li .cap.length = 12, 1853a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1863a9622dcSShaohua Li }; 18763f10f0fSKenji Kaneshige acpi_status status; 18863f10f0fSKenji Kaneshige 1893a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1903a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1913a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1923a9622dcSShaohua Li kfree(context.ret.pointer); 19363f10f0fSKenji Kaneshige } 19463f10f0fSKenji Kaneshige return status; 19563f10f0fSKenji Kaneshige } 19663f10f0fSKenji Kaneshige 197ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 198ab8e8957SRafael J. Wysocki u32 support, 199ab8e8957SRafael J. Wysocki u32 *control) 20063f10f0fSKenji Kaneshige { 20163f10f0fSKenji Kaneshige acpi_status status; 202ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 20363f10f0fSKenji Kaneshige 204ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 205ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 206ab8e8957SRafael J. Wysocki 207b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 208b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 209ab8e8957SRafael J. Wysocki if (control) { 210ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 211b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 212ab8e8957SRafael J. Wysocki } else { 213545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 214b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 215ab8e8957SRafael J. Wysocki } 21663f10f0fSKenji Kaneshige 21763f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 21863f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 219ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2202b8fd918SRafael J. Wysocki if (control) 221ab8e8957SRafael J. Wysocki *control = result; 222ab8e8957SRafael J. Wysocki } 22363f10f0fSKenji Kaneshige return status; 22463f10f0fSKenji Kaneshige } 22563f10f0fSKenji Kaneshige 22663f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 22763f10f0fSKenji Kaneshige { 22863f10f0fSKenji Kaneshige acpi_status status; 22963f10f0fSKenji Kaneshige 23063f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 231ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 23263f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 23363f10f0fSKenji Kaneshige return status; 23463f10f0fSKenji Kaneshige } 23563f10f0fSKenji Kaneshige 23676d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 23763f10f0fSKenji Kaneshige { 23863f10f0fSKenji Kaneshige struct acpi_pci_root *root; 239cd4faf9cSTaku Izumi struct acpi_device *device; 240c1aec834SBjorn Helgaas 241cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 242cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 24363f10f0fSKenji Kaneshige return NULL; 244cd4faf9cSTaku Izumi 245cd4faf9cSTaku Izumi root = acpi_driver_data(device); 246cd4faf9cSTaku Izumi 247cd4faf9cSTaku Izumi return root; 24863f10f0fSKenji Kaneshige } 24976d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 25063f10f0fSKenji Kaneshige 2512f7bbcebSAlexander Chiang struct acpi_handle_node { 2522f7bbcebSAlexander Chiang struct list_head node; 2532f7bbcebSAlexander Chiang acpi_handle handle; 2542f7bbcebSAlexander Chiang }; 2552f7bbcebSAlexander Chiang 2562f7bbcebSAlexander Chiang /** 2572f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2582f7bbcebSAlexander Chiang * @handle: the handle in question 2592f7bbcebSAlexander Chiang * 2602f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2612f7bbcebSAlexander Chiang * list of PCI devices. 2622f7bbcebSAlexander Chiang * 2632f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2642f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2652f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2662f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2672f7bbcebSAlexander Chiang */ 2682f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2692f7bbcebSAlexander Chiang { 2702f7bbcebSAlexander Chiang int dev, fn; 2712f7bbcebSAlexander Chiang unsigned long long adr; 2722f7bbcebSAlexander Chiang acpi_status status; 2732f7bbcebSAlexander Chiang acpi_handle phandle; 2742f7bbcebSAlexander Chiang struct pci_bus *pbus; 2752f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2762f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2772f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2782f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2792f7bbcebSAlexander Chiang 2802f7bbcebSAlexander Chiang /* 2812f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2822f7bbcebSAlexander Chiang */ 2832f7bbcebSAlexander Chiang phandle = handle; 2842f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2852f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2862f7bbcebSAlexander Chiang if (!node) 2872f7bbcebSAlexander Chiang goto out; 2882f7bbcebSAlexander Chiang 2892f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2902f7bbcebSAlexander Chiang node->handle = phandle; 2912f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2922f7bbcebSAlexander Chiang 2932f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2942f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2952f7bbcebSAlexander Chiang goto out; 2962f7bbcebSAlexander Chiang } 2972f7bbcebSAlexander Chiang 2982f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2992f7bbcebSAlexander Chiang if (!root) 3002f7bbcebSAlexander Chiang goto out; 3012f7bbcebSAlexander Chiang 3022f7bbcebSAlexander Chiang pbus = root->bus; 3032f7bbcebSAlexander Chiang 3042f7bbcebSAlexander Chiang /* 3052f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3062f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3072f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3082f7bbcebSAlexander Chiang */ 3092f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3102f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3112f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3122f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3132f7bbcebSAlexander Chiang goto out; 3142f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3152f7bbcebSAlexander Chiang fn = adr & 0xffff; 3162f7bbcebSAlexander Chiang 3172f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 318412af978STroy Moure if (!pdev || hnd == handle) 3192f7bbcebSAlexander Chiang break; 3202f7bbcebSAlexander Chiang 3212f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3222f7bbcebSAlexander Chiang pci_dev_put(pdev); 323497fb54fSRafael J. Wysocki 324497fb54fSRafael J. Wysocki /* 325497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 326497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 327497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 328497fb54fSRafael J. Wysocki */ 329497fb54fSRafael J. Wysocki if (!pbus) { 330497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 331497fb54fSRafael J. Wysocki pdev = NULL; 332497fb54fSRafael J. Wysocki break; 333497fb54fSRafael J. Wysocki } 3342f7bbcebSAlexander Chiang } 3352f7bbcebSAlexander Chiang out: 3362f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3372f7bbcebSAlexander Chiang kfree(node); 3382f7bbcebSAlexander Chiang 3392f7bbcebSAlexander Chiang return pdev; 3402f7bbcebSAlexander Chiang } 3412f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3422f7bbcebSAlexander Chiang 34363f10f0fSKenji Kaneshige /** 34475fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 34575fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 34675fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 34775fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 34863f10f0fSKenji Kaneshige * 34975fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 35075fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 35175fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 35275fb60f2SRafael J. Wysocki * 35375fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 35475fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 35575fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 35675fb60f2SRafael J. Wysocki * on failure. 35763f10f0fSKenji Kaneshige **/ 35875fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 35963f10f0fSKenji Kaneshige { 36063f10f0fSKenji Kaneshige struct acpi_pci_root *root; 3614ffe6e54SBjorn Helgaas acpi_status status = AE_OK; 36275fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 36363f10f0fSKenji Kaneshige 36475fb60f2SRafael J. Wysocki if (!mask) 36575fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 36675fb60f2SRafael J. Wysocki 36775fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 36875fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 36963f10f0fSKenji Kaneshige return AE_TYPE; 37063f10f0fSKenji Kaneshige 37163f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 37263f10f0fSKenji Kaneshige if (!root) 37363f10f0fSKenji Kaneshige return AE_NOT_EXIST; 37463f10f0fSKenji Kaneshige 37563f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 37675fb60f2SRafael J. Wysocki 37775fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 37863f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 37975fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 38063f10f0fSKenji Kaneshige goto out; 38163f10f0fSKenji Kaneshige 38275fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 38375fb60f2SRafael J. Wysocki while (*mask) { 38475fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 38563f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 38663f10f0fSKenji Kaneshige goto out; 38775fb60f2SRafael J. Wysocki if (ctrl == *mask) 38875fb60f2SRafael J. Wysocki break; 389955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 390955f14b4SBjorn Helgaas ctrl & ~(*mask)); 39175fb60f2SRafael J. Wysocki ctrl = *mask; 39275fb60f2SRafael J. Wysocki } 3932b8fd918SRafael J. Wysocki 39475fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 395955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 396955f14b4SBjorn Helgaas req & ~(ctrl)); 39763f10f0fSKenji Kaneshige status = AE_SUPPORT; 39863f10f0fSKenji Kaneshige goto out; 39963f10f0fSKenji Kaneshige } 40063f10f0fSKenji Kaneshige 401b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 402b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 403b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 40475fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 40563f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 40675fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 40763f10f0fSKenji Kaneshige out: 40863f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 40963f10f0fSKenji Kaneshige return status; 41063f10f0fSKenji Kaneshige } 4119f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 41263f10f0fSKenji Kaneshige 413c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 414c238252fSSinan Kaya bool is_pcie) 4153e43abb0SBjorn Helgaas { 416955f14b4SBjorn Helgaas u32 support, control, requested; 4173e43abb0SBjorn Helgaas acpi_status status; 4183e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4193e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4203e43abb0SBjorn Helgaas 4213e43abb0SBjorn Helgaas /* 4227bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4237bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4247bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4257bc5a2baSMatthew Garrett */ 426630b3affSLukas Wunner if (x86_apple_machine) { 4277bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4287bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4297bc5a2baSMatthew Garrett root->osc_control_set); 4307bc5a2baSMatthew Garrett return; 4317bc5a2baSMatthew Garrett } 4327bc5a2baSMatthew Garrett 4337bc5a2baSMatthew Garrett /* 4343e43abb0SBjorn Helgaas * All supported architectures that use ACPI have support for 4353e43abb0SBjorn Helgaas * PCI domains, so we indicate this in _OSC support capabilities. 4363e43abb0SBjorn Helgaas */ 43765afe916SBjorn Helgaas support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 438ba11edc6SAlexandru Gagniuc support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 4393e43abb0SBjorn Helgaas if (pci_ext_cfg_avail()) 440b8eb67fcSBjorn Helgaas support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4411b2a7be6SBjorn Helgaas if (pcie_aspm_support_enabled()) 442b8eb67fcSBjorn Helgaas support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4433e43abb0SBjorn Helgaas if (pci_msi_enabled()) 444b8eb67fcSBjorn Helgaas support |= OSC_PCI_MSI_SUPPORT; 445ac1c8e35SKuppuswamy Sathyanarayanan if (IS_ENABLED(CONFIG_PCIE_EDR)) 446ac1c8e35SKuppuswamy Sathyanarayanan support |= OSC_PCI_EDR_SUPPORT; 447955f14b4SBjorn Helgaas 448955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 449b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4503e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 451c238252fSSinan Kaya *no_aspm = 1; 452c238252fSSinan Kaya 453c238252fSSinan Kaya /* _OSC is optional for PCI host bridges */ 454c238252fSSinan Kaya if ((status == AE_NOT_FOUND) && !is_pcie) 455c238252fSSinan Kaya return; 456c238252fSSinan Kaya 4571ad61b61SSinan Kaya dev_info(&device->dev, "_OSC failed (%s)%s\n", 4581ad61b61SSinan Kaya acpi_format_exception(status), 4591ad61b61SSinan Kaya pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); 46065afe916SBjorn Helgaas return; 4613e43abb0SBjorn Helgaas } 4623e43abb0SBjorn Helgaas 46343613a1fSBjorn Helgaas if (pcie_ports_disabled) { 46443613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 46543613a1fSBjorn Helgaas return; 46643613a1fSBjorn Helgaas } 46743613a1fSBjorn Helgaas 468de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 469955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 470955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 471de189662SBjorn Helgaas return; 472de189662SBjorn Helgaas } 473de189662SBjorn Helgaas 474b8eb67fcSBjorn Helgaas control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4753e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_PME_CONTROL; 4763e43abb0SBjorn Helgaas 477af8bb9f8SBjorn Helgaas if (IS_ENABLED(CONFIG_PCIEASPM)) 478af8bb9f8SBjorn Helgaas control |= OSC_PCI_EXPRESS_LTR_CONTROL; 479af8bb9f8SBjorn Helgaas 480408fec36SMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 481408fec36SMika Westerberg control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 482408fec36SMika Westerberg 4831df81a6dSMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 4841df81a6dSMika Westerberg control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 4851df81a6dSMika Westerberg 4863e43abb0SBjorn Helgaas if (pci_aer_available()) { 4873e43abb0SBjorn Helgaas if (aer_acpi_firmware_first()) 488955f14b4SBjorn Helgaas dev_info(&device->dev, 489955f14b4SBjorn Helgaas "PCIe AER handled by firmware\n"); 4903e43abb0SBjorn Helgaas else 491b8eb67fcSBjorn Helgaas control |= OSC_PCI_EXPRESS_AER_CONTROL; 4923e43abb0SBjorn Helgaas } 4933e43abb0SBjorn Helgaas 494ac1c8e35SKuppuswamy Sathyanarayanan /* 495ac1c8e35SKuppuswamy Sathyanarayanan * Per the Downstream Port Containment Related Enhancements ECN to 496ac1c8e35SKuppuswamy Sathyanarayanan * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, 497ac1c8e35SKuppuswamy Sathyanarayanan * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC 498ac1c8e35SKuppuswamy Sathyanarayanan * and EDR. 499ac1c8e35SKuppuswamy Sathyanarayanan */ 500ac1c8e35SKuppuswamy Sathyanarayanan if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) 501ac1c8e35SKuppuswamy Sathyanarayanan control |= OSC_PCI_EXPRESS_DPC_CONTROL; 502ac1c8e35SKuppuswamy Sathyanarayanan 503955f14b4SBjorn Helgaas requested = control; 504b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 5053e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 5063e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 507955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 5083e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 5093e43abb0SBjorn Helgaas /* 510387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 511387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 512387d3757SMatthew Garrett * intact and prevent the OS from touching it. 5133e43abb0SBjorn Helgaas */ 514387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 515387d3757SMatthew Garrett *no_aspm = 1; 5163e43abb0SBjorn Helgaas } 5173e43abb0SBjorn Helgaas } else { 518955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 519955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 520955f14b4SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 521955f14b4SBjorn Helgaas acpi_format_exception(status)); 522955f14b4SBjorn Helgaas 5233e43abb0SBjorn Helgaas /* 5243e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5253e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5263e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5273e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5283e43abb0SBjorn Helgaas * root scan. 5293e43abb0SBjorn Helgaas */ 5303e43abb0SBjorn Helgaas *no_aspm = 1; 5313e43abb0SBjorn Helgaas } 5323e43abb0SBjorn Helgaas } 5333e43abb0SBjorn Helgaas 53400c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 53500c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5361da177e4SLinus Torvalds { 537f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 538f5eebbe1SBjorn Helgaas acpi_status status; 539f5eebbe1SBjorn Helgaas int result; 540f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 541bfe2414aSJiang Liu acpi_handle handle = device->handle; 542387d3757SMatthew Garrett int no_aspm = 0; 5439762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 544c238252fSSinan Kaya bool is_pcie; 5451da177e4SLinus Torvalds 5466ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5476ad95513SBjorn Helgaas if (!root) 5486ad95513SBjorn Helgaas return -ENOMEM; 5496ad95513SBjorn Helgaas 550f5eebbe1SBjorn Helgaas segment = 0; 551bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 552f5eebbe1SBjorn Helgaas &segment); 553f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5546dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5556ad95513SBjorn Helgaas result = -ENODEV; 5566ad95513SBjorn Helgaas goto end; 557f5eebbe1SBjorn Helgaas } 5581da177e4SLinus Torvalds 559f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5606ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 561bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 562f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5636ad95513SBjorn Helgaas /* 5646ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5656ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5666ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5676ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5686ad95513SBjorn Helgaas */ 5696ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5706dc7d22cSJiang Liu dev_warn(&device->dev, 5716dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 572bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 573e545b55aSJon Mason NULL, &bus); 5746ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5756ad95513SBjorn Helgaas root->secondary.start = bus; 5766ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5776ad95513SBjorn Helgaas root->secondary.start = 0; 5786ad95513SBjorn Helgaas else { 5796dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5806ad95513SBjorn Helgaas result = -ENODEV; 5816ad95513SBjorn Helgaas goto end; 582f5eebbe1SBjorn Helgaas } 583f5eebbe1SBjorn Helgaas } 5841da177e4SLinus Torvalds 58532917e5bSPatrick Mochel root->device = device; 5860705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5871da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5881da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 589db89b4f0SPavel Machek device->driver_data = root; 5901da177e4SLinus Torvalds 591864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 592864b94adSJiang Liu result = -ENXIO; 593864b94adSJiang Liu goto end; 594864b94adSJiang Liu } 595864b94adSJiang Liu 5966dc7d22cSJiang Liu pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", 597d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 598d4761ba2SBjorn Helgaas root->segment, &root->secondary); 599d4761ba2SBjorn Helgaas 600bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 601f4b57a3bSJiang Liu 602c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 603c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 604415e12b2SRafael J. Wysocki 6053dc48af3SNeil Horman /* 6063dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 6073dc48af3SNeil Horman */ 6083dc48af3SNeil Horman 6093dc48af3SNeil Horman /* 6103dc48af3SNeil Horman * Scan the Root Bridge 6113dc48af3SNeil Horman * -------------------- 6123dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 6133dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 6143dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 6153dc48af3SNeil Horman */ 6163dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 6173dc48af3SNeil Horman if (!root->bus) { 6183dc48af3SNeil Horman dev_err(&device->dev, 6193dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6203dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 621f516bde5SRafael J. Wysocki device->driver_data = NULL; 6223dc48af3SNeil Horman result = -ENODEV; 623864b94adSJiang Liu goto remove_dmar; 6243dc48af3SNeil Horman } 6253dc48af3SNeil Horman 6263dc48af3SNeil Horman if (no_aspm) 6273dc48af3SNeil Horman pcie_no_aspm(); 6283dc48af3SNeil Horman 629c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 630de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 631b67ea761SRafael J. Wysocki 632864b94adSJiang Liu if (hotadd) { 6333c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 63439772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 635584c5c42SRui Wang /* 636584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 637584c5c42SRui Wang * case, we need to wait until after PCI initialization in 638584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 639584c5c42SRui Wang * 640584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 641584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 642584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 643584c5c42SRui Wang * (see drivers/acpi/Kconfig). 644584c5c42SRui Wang */ 645fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 646516ca223SJiang Liu } 64762a08c5aSYinghai Lu 6487a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 649c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6507a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 65100c43b96SRafael J. Wysocki return 1; 65247525cdaSRafael J. Wysocki 653864b94adSJiang Liu remove_dmar: 654864b94adSJiang Liu if (hotadd) 655864b94adSJiang Liu dmar_device_remove(handle); 65647525cdaSRafael J. Wysocki end: 65747525cdaSRafael J. Wysocki kfree(root); 65847525cdaSRafael J. Wysocki return result; 659c431ada4SRajesh Shah } 6601da177e4SLinus Torvalds 66100c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6621da177e4SLinus Torvalds { 663caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 664c8e9afb1SJiang Liu 6657a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6667a3bb55eSRafael J. Wysocki 6679738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6689738a1fdSYinghai Lu 669f2ae5da7SRui Wang pci_ioapic_remove(root); 670de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 671b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 672b67ea761SRafael J. Wysocki 6739738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 674f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6759738a1fdSYinghai Lu 676864b94adSJiang Liu dmar_device_remove(device->handle); 677864b94adSJiang Liu 6787a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6797a3bb55eSRafael J. Wysocki 6801da177e4SLinus Torvalds kfree(root); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6832c204383SJiang Liu /* 6842c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6852c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6862c204383SJiang Liu * and ARM64. 6872c204383SJiang Liu */ 6882c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6892c204383SJiang Liu struct list_head *resources, 6902c204383SJiang Liu unsigned long type) 6912c204383SJiang Liu { 6922c204383SJiang Liu LIST_HEAD(list); 6932c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6942c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6952c204383SJiang Liu 6962c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6972c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6982c204383SJiang Liu 6992c204383SJiang Liu list_splice_init(resources, &list); 7002c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 7012c204383SJiang Liu bool free = false; 7022c204383SJiang Liu resource_size_t end; 7032c204383SJiang Liu 7042c204383SJiang Liu res1 = entry->res; 7052c204383SJiang Liu if (!(res1->flags & type)) 7062c204383SJiang Liu goto next; 7072c204383SJiang Liu 7082c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 7092c204383SJiang Liu end = min(res1->end, root->end); 7102c204383SJiang Liu if (end <= res1->start) { 7112c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 7122c204383SJiang Liu res1); 7132c204383SJiang Liu free = true; 7142c204383SJiang Liu goto next; 7152c204383SJiang Liu } else if (res1->end != end) { 7162c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 7172c204383SJiang Liu res1, (unsigned long long)end + 1, 7182c204383SJiang Liu (unsigned long long)res1->end); 7192c204383SJiang Liu res1->end = end; 7202c204383SJiang Liu } 7212c204383SJiang Liu 7222c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7232c204383SJiang Liu res2 = entry2->res; 7242c204383SJiang Liu if (!(res2->flags & type)) 7252c204383SJiang Liu continue; 7262c204383SJiang Liu 7272c204383SJiang Liu /* 7282c204383SJiang Liu * I don't like throwing away windows because then 7292c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7302c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7312c204383SJiang Liu */ 7322c204383SJiang Liu if (resource_overlaps(res1, res2)) { 7332c204383SJiang Liu res2->start = min(res1->start, res2->start); 7342c204383SJiang Liu res2->end = max(res1->end, res2->end); 7352c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7362c204383SJiang Liu res2, res1); 7372c204383SJiang Liu free = true; 7382c204383SJiang Liu goto next; 7392c204383SJiang Liu } 7402c204383SJiang Liu } 7412c204383SJiang Liu 7422c204383SJiang Liu next: 7432c204383SJiang Liu resource_list_del(entry); 7442c204383SJiang Liu if (free) 7452c204383SJiang Liu resource_list_free_entry(entry); 7462c204383SJiang Liu else 7472c204383SJiang Liu resource_list_add_tail(entry, resources); 7482c204383SJiang Liu } 7492c204383SJiang Liu } 7502c204383SJiang Liu 751fcfaab30SGabriele Paoloni static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, 752fcfaab30SGabriele Paoloni struct resource_entry *entry) 7530a70abb3SJayachandran C { 7540a70abb3SJayachandran C #ifdef PCI_IOBASE 7550a70abb3SJayachandran C struct resource *res = entry->res; 7560a70abb3SJayachandran C resource_size_t cpu_addr = res->start; 7570a70abb3SJayachandran C resource_size_t pci_addr = cpu_addr - entry->offset; 7580a70abb3SJayachandran C resource_size_t length = resource_size(res); 7590a70abb3SJayachandran C unsigned long port; 7600a70abb3SJayachandran C 761fcfaab30SGabriele Paoloni if (pci_register_io_range(fwnode, cpu_addr, length)) 7620a70abb3SJayachandran C goto err; 7630a70abb3SJayachandran C 7640a70abb3SJayachandran C port = pci_address_to_pio(cpu_addr); 7650a70abb3SJayachandran C if (port == (unsigned long)-1) 7660a70abb3SJayachandran C goto err; 7670a70abb3SJayachandran C 7680a70abb3SJayachandran C res->start = port; 7690a70abb3SJayachandran C res->end = port + length - 1; 7700a70abb3SJayachandran C entry->offset = port - pci_addr; 7710a70abb3SJayachandran C 7720a70abb3SJayachandran C if (pci_remap_iospace(res, cpu_addr) < 0) 7730a70abb3SJayachandran C goto err; 7740a70abb3SJayachandran C 7750a70abb3SJayachandran C pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); 7760a70abb3SJayachandran C return; 7770a70abb3SJayachandran C err: 7780a70abb3SJayachandran C res->flags |= IORESOURCE_DISABLED; 7790a70abb3SJayachandran C #endif 7800a70abb3SJayachandran C } 7810a70abb3SJayachandran C 7822c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7832c204383SJiang Liu { 7842c204383SJiang Liu int ret; 7852c204383SJiang Liu struct list_head *list = &info->resources; 7862c204383SJiang Liu struct acpi_device *device = info->bridge; 7872c204383SJiang Liu struct resource_entry *entry, *tmp; 7882c204383SJiang Liu unsigned long flags; 7892c204383SJiang Liu 7902c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7912c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7922c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7932c204383SJiang Liu (void *)flags); 7942c204383SJiang Liu if (ret < 0) 7952c204383SJiang Liu dev_warn(&device->dev, 7962c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7972c204383SJiang Liu else if (ret == 0) 7982c204383SJiang Liu dev_dbg(&device->dev, 7992c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 8002c204383SJiang Liu else { 8012c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 8020a70abb3SJayachandran C if (entry->res->flags & IORESOURCE_IO) 803fcfaab30SGabriele Paoloni acpi_pci_root_remap_iospace(&device->fwnode, 804fcfaab30SGabriele Paoloni entry); 8050a70abb3SJayachandran C 8062c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 8072c204383SJiang Liu resource_list_destroy_entry(entry); 8082c204383SJiang Liu else 8092c204383SJiang Liu entry->res->name = info->name; 8102c204383SJiang Liu } 8112c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8122c204383SJiang Liu IORESOURCE_MEM); 8132c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8142c204383SJiang Liu IORESOURCE_IO); 8152c204383SJiang Liu } 8162c204383SJiang Liu 8172c204383SJiang Liu return ret; 8182c204383SJiang Liu } 8192c204383SJiang Liu 8202c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 8212c204383SJiang Liu { 8222c204383SJiang Liu struct resource_entry *entry, *tmp; 8232c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 8242c204383SJiang Liu 8252c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8262c204383SJiang Liu res = entry->res; 8272c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 8282c204383SJiang Liu root = &iomem_resource; 8292c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 8302c204383SJiang Liu root = &ioport_resource; 8312c204383SJiang Liu else 8322c204383SJiang Liu continue; 8332c204383SJiang Liu 834727ae8beSLiu Jiang /* 835727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 836727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 837727ae8beSLiu Jiang */ 838727ae8beSLiu Jiang if (res == root) 839727ae8beSLiu Jiang continue; 840727ae8beSLiu Jiang 8412c204383SJiang Liu conflict = insert_resource_conflict(root, res); 8422c204383SJiang Liu if (conflict) { 8432c204383SJiang Liu dev_info(&info->bridge->dev, 8442c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 8452c204383SJiang Liu res, conflict->name, conflict); 8462c204383SJiang Liu resource_list_destroy_entry(entry); 8472c204383SJiang Liu } 8482c204383SJiang Liu } 8492c204383SJiang Liu } 8502c204383SJiang Liu 8512c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 8522c204383SJiang Liu { 8532c204383SJiang Liu struct resource *res; 8542c204383SJiang Liu struct resource_entry *entry, *tmp; 8552c204383SJiang Liu 8562c204383SJiang Liu if (!info) 8572c204383SJiang Liu return; 8582c204383SJiang Liu 8592c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8602c204383SJiang Liu res = entry->res; 8612c204383SJiang Liu if (res->parent && 8622c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8632c204383SJiang Liu release_resource(res); 8642c204383SJiang Liu resource_list_destroy_entry(entry); 8652c204383SJiang Liu } 8662c204383SJiang Liu 8672c204383SJiang Liu info->ops->release_info(info); 8682c204383SJiang Liu } 8692c204383SJiang Liu 8702c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8712c204383SJiang Liu { 8722c204383SJiang Liu struct resource *res; 8732c204383SJiang Liu struct resource_entry *entry; 8742c204383SJiang Liu 8752c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8762c204383SJiang Liu res = entry->res; 8770a70abb3SJayachandran C if (res->flags & IORESOURCE_IO) 8780a70abb3SJayachandran C pci_unmap_iospace(res); 8792c204383SJiang Liu if (res->parent && 8802c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8812c204383SJiang Liu release_resource(res); 8822c204383SJiang Liu } 8832c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8842c204383SJiang Liu } 8852c204383SJiang Liu 8862c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8872c204383SJiang Liu struct acpi_pci_root_ops *ops, 8882c204383SJiang Liu struct acpi_pci_root_info *info, 8892c204383SJiang Liu void *sysdata) 8902c204383SJiang Liu { 8912c204383SJiang Liu int ret, busnum = root->secondary.start; 8922c204383SJiang Liu struct acpi_device *device = root->device; 8932c204383SJiang Liu int node = acpi_get_node(device->handle); 8942c204383SJiang Liu struct pci_bus *bus; 89502bfeb48SBjorn Helgaas struct pci_host_bridge *host_bridge; 896a78cf965SBenjamin Herrenschmidt union acpi_object *obj; 8972c204383SJiang Liu 8982c204383SJiang Liu info->root = root; 8992c204383SJiang Liu info->bridge = device; 9002c204383SJiang Liu info->ops = ops; 9012c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 9022c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 9032c204383SJiang Liu root->segment, busnum); 9042c204383SJiang Liu 9052c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 9062c204383SJiang Liu goto out_release_info; 9072c204383SJiang Liu if (ops->prepare_resources) 9082c204383SJiang Liu ret = ops->prepare_resources(info); 9092c204383SJiang Liu else 9102c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 9112c204383SJiang Liu if (ret < 0) 9122c204383SJiang Liu goto out_release_info; 9132c204383SJiang Liu 9142c204383SJiang Liu pci_acpi_root_add_resources(info); 9152c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 9162c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 9172c204383SJiang Liu sysdata, &info->resources); 9182c204383SJiang Liu if (!bus) 9192c204383SJiang Liu goto out_release_info; 9202c204383SJiang Liu 92102bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 92202bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9239310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9241df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9251df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 92602bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 92702bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 92802bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 92902bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 930af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 931af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 932ac1c8e35SKuppuswamy Sathyanarayanan if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) 933ac1c8e35SKuppuswamy Sathyanarayanan host_bridge->native_dpc = 0; 93402bfeb48SBjorn Helgaas 935a78cf965SBenjamin Herrenschmidt /* 936a78cf965SBenjamin Herrenschmidt * Evaluate the "PCI Boot Configuration" _DSM Function. If it 937a78cf965SBenjamin Herrenschmidt * exists and returns 0, we must preserve any PCI resource 938a78cf965SBenjamin Herrenschmidt * assignments made by firmware for this host bridge. 939a78cf965SBenjamin Herrenschmidt */ 940a78cf965SBenjamin Herrenschmidt obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, 9413910ebacSKrzysztof Wilczyński DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); 942a78cf965SBenjamin Herrenschmidt if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) 943a78cf965SBenjamin Herrenschmidt host_bridge->preserve_config = 1; 944a78cf965SBenjamin Herrenschmidt ACPI_FREE(obj); 945a78cf965SBenjamin Herrenschmidt 9462c204383SJiang Liu pci_scan_child_bus(bus); 94702bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 94802bfeb48SBjorn Helgaas info); 9492c204383SJiang Liu if (node != NUMA_NO_NODE) 9502c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9512c204383SJiang Liu return bus; 9522c204383SJiang Liu 9532c204383SJiang Liu out_release_info: 9542c204383SJiang Liu __acpi_pci_root_release_info(info); 9552c204383SJiang Liu return NULL; 9562c204383SJiang Liu } 9572c204383SJiang Liu 95800c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9591da177e4SLinus Torvalds { 960d3072e6aSRafael J. Wysocki acpi_hest_init(); 9613338db00SRafael J. Wysocki if (acpi_pci_disabled) 9623338db00SRafael J. Wysocki return; 963d3072e6aSRafael J. Wysocki 9647bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9653338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 966668192b6SYinghai Lu } 967