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> 18eca67315SNaga Chumbalkar #include <linux/pci-aspm.h> 19864b94adSJiang Liu #include <linux/dmar.h> 201da177e4SLinus Torvalds #include <linux/acpi.h> 215a0e3ad6STejun Heo #include <linux/slab.h> 227bc5a2baSMatthew Garrett #include <linux/dmi.h> 23630b3affSLukas Wunner #include <linux/platform_data/x86/apple.h> 248b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 251da177e4SLinus Torvalds 26ace8238bSRafael J. Wysocki #include "internal.h" 27ace8238bSRafael J. Wysocki 281da177e4SLinus Torvalds #define _COMPONENT ACPI_PCI_COMPONENT 29f52fd66dSLen Brown ACPI_MODULE_NAME("pci_root"); 301da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 311da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 3200c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 3300c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 3400c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 351da177e4SLinus Torvalds 363338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 373338db00SRafael J. Wysocki { 381f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 393338db00SRafael J. Wysocki return 0; 403338db00SRafael J. Wysocki } 413338db00SRafael J. Wysocki 427dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 437dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 447dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 457dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 46415e12b2SRafael J. Wysocki 47c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 481ba90e3aSThomas Renninger {"PNP0A03", 0}, 491ba90e3aSThomas Renninger {"", 0}, 501ba90e3aSThomas Renninger }; 511ba90e3aSThomas Renninger 5200c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 531ba90e3aSThomas Renninger .ids = root_device_ids, 5400c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 5500c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 56ca499fc8SToshi Kani .hotplug = { 573338db00SRafael J. Wysocki .enabled = true, 583338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 59ca499fc8SToshi Kani }, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 6263f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 631da177e4SLinus Torvalds 6427558203SAlexander Chiang /** 6527558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 6627558203SAlexander Chiang * @handle - the ACPI CA node in question. 6727558203SAlexander Chiang * 6827558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6927558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 7027558203SAlexander Chiang */ 7127558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 7227558203SAlexander Chiang { 7327558203SAlexander Chiang int ret; 7427558203SAlexander Chiang struct acpi_device *device; 7527558203SAlexander Chiang 7627558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 7727558203SAlexander Chiang if (ret) 7827558203SAlexander Chiang return 0; 7927558203SAlexander Chiang 8027558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 8127558203SAlexander Chiang if (ret) 8227558203SAlexander Chiang return 0; 8327558203SAlexander Chiang else 8427558203SAlexander Chiang return 1; 8527558203SAlexander Chiang } 8627558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8727558203SAlexander Chiang 881da177e4SLinus Torvalds static acpi_status 891da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 901da177e4SLinus Torvalds { 916ad95513SBjorn Helgaas struct resource *res = data; 921da177e4SLinus Torvalds struct acpi_resource_address64 address; 93f6c1c8ffSBjorn Helgaas acpi_status status; 941da177e4SLinus Torvalds 95f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 96f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 971da177e4SLinus Torvalds return AE_OK; 981da177e4SLinus Torvalds 99a45de93eSLv Zheng if ((address.address.address_length > 0) && 1006ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 101a45de93eSLv Zheng res->start = address.address.minimum; 102a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 1036ad95513SBjorn Helgaas } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds return AE_OK; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 108f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1096ad95513SBjorn Helgaas struct resource *res) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds acpi_status status; 1121da177e4SLinus Torvalds 1136ad95513SBjorn Helgaas res->start = -1; 1144be44fcdSLen Brown status = 1154be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1166ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1171da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1181da177e4SLinus Torvalds return status; 1196ad95513SBjorn Helgaas if (res->start == -1) 1201da177e4SLinus Torvalds return AE_ERROR; 1211da177e4SLinus Torvalds return AE_OK; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 124955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 125955f14b4SBjorn Helgaas u32 bit; 126955f14b4SBjorn Helgaas char *desc; 127955f14b4SBjorn Helgaas }; 128955f14b4SBjorn Helgaas 129955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 130955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 131955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 132955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 133955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 134955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 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" }, 145955f14b4SBjorn Helgaas }; 146955f14b4SBjorn Helgaas 147955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 148955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 149955f14b4SBjorn Helgaas { 150955f14b4SBjorn Helgaas char buf[80]; 151955f14b4SBjorn Helgaas int i, len = 0; 152955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 153955f14b4SBjorn Helgaas 154955f14b4SBjorn Helgaas buf[0] = '\0'; 155955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 156955f14b4SBjorn Helgaas if (word & entry->bit) 157955f14b4SBjorn Helgaas len += snprintf(buf + len, sizeof(buf) - len, "%s%s", 158955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 159955f14b4SBjorn Helgaas 160955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 161955f14b4SBjorn Helgaas } 162955f14b4SBjorn Helgaas 163955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 164955f14b4SBjorn Helgaas { 165955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 166955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 167955f14b4SBjorn Helgaas } 168955f14b4SBjorn Helgaas 169955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 170955f14b4SBjorn Helgaas { 171955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 172955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 173955f14b4SBjorn Helgaas } 174955f14b4SBjorn Helgaas 1753a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17663f10f0fSKenji Kaneshige 17763f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17863f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 17963f10f0fSKenji Kaneshige { 1803a9622dcSShaohua Li struct acpi_osc_context context = { 1813a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1823a9622dcSShaohua Li .rev = 1, 1833a9622dcSShaohua Li .cap.length = 12, 1843a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1853a9622dcSShaohua Li }; 18663f10f0fSKenji Kaneshige acpi_status status; 18763f10f0fSKenji Kaneshige 1883a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1893a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1903a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1913a9622dcSShaohua Li kfree(context.ret.pointer); 19263f10f0fSKenji Kaneshige } 19363f10f0fSKenji Kaneshige return status; 19463f10f0fSKenji Kaneshige } 19563f10f0fSKenji Kaneshige 196ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 197ab8e8957SRafael J. Wysocki u32 support, 198ab8e8957SRafael J. Wysocki u32 *control) 19963f10f0fSKenji Kaneshige { 20063f10f0fSKenji Kaneshige acpi_status status; 201ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 20263f10f0fSKenji Kaneshige 203ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 204ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 205ab8e8957SRafael J. Wysocki 206b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 207b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 208ab8e8957SRafael J. Wysocki if (control) { 209ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 210b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 211ab8e8957SRafael J. Wysocki } else { 212545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 213b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 214ab8e8957SRafael J. Wysocki } 21563f10f0fSKenji Kaneshige 21663f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 21763f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 218ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2192b8fd918SRafael J. Wysocki if (control) 220ab8e8957SRafael J. Wysocki *control = result; 221ab8e8957SRafael J. Wysocki } 22263f10f0fSKenji Kaneshige return status; 22363f10f0fSKenji Kaneshige } 22463f10f0fSKenji Kaneshige 22563f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 22663f10f0fSKenji Kaneshige { 22763f10f0fSKenji Kaneshige acpi_status status; 22863f10f0fSKenji Kaneshige 22963f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 230ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 23163f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 23263f10f0fSKenji Kaneshige return status; 23363f10f0fSKenji Kaneshige } 23463f10f0fSKenji Kaneshige 23576d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 23663f10f0fSKenji Kaneshige { 23763f10f0fSKenji Kaneshige struct acpi_pci_root *root; 238cd4faf9cSTaku Izumi struct acpi_device *device; 239c1aec834SBjorn Helgaas 240cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 241cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 24263f10f0fSKenji Kaneshige return NULL; 243cd4faf9cSTaku Izumi 244cd4faf9cSTaku Izumi root = acpi_driver_data(device); 245cd4faf9cSTaku Izumi 246cd4faf9cSTaku Izumi return root; 24763f10f0fSKenji Kaneshige } 24876d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 24963f10f0fSKenji Kaneshige 2502f7bbcebSAlexander Chiang struct acpi_handle_node { 2512f7bbcebSAlexander Chiang struct list_head node; 2522f7bbcebSAlexander Chiang acpi_handle handle; 2532f7bbcebSAlexander Chiang }; 2542f7bbcebSAlexander Chiang 2552f7bbcebSAlexander Chiang /** 2562f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2572f7bbcebSAlexander Chiang * @handle: the handle in question 2582f7bbcebSAlexander Chiang * 2592f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2602f7bbcebSAlexander Chiang * list of PCI devices. 2612f7bbcebSAlexander Chiang * 2622f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2632f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2642f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2652f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2662f7bbcebSAlexander Chiang */ 2672f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2682f7bbcebSAlexander Chiang { 2692f7bbcebSAlexander Chiang int dev, fn; 2702f7bbcebSAlexander Chiang unsigned long long adr; 2712f7bbcebSAlexander Chiang acpi_status status; 2722f7bbcebSAlexander Chiang acpi_handle phandle; 2732f7bbcebSAlexander Chiang struct pci_bus *pbus; 2742f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2752f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2762f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2772f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2782f7bbcebSAlexander Chiang 2792f7bbcebSAlexander Chiang /* 2802f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2812f7bbcebSAlexander Chiang */ 2822f7bbcebSAlexander Chiang phandle = handle; 2832f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2842f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2852f7bbcebSAlexander Chiang if (!node) 2862f7bbcebSAlexander Chiang goto out; 2872f7bbcebSAlexander Chiang 2882f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2892f7bbcebSAlexander Chiang node->handle = phandle; 2902f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2912f7bbcebSAlexander Chiang 2922f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2932f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2942f7bbcebSAlexander Chiang goto out; 2952f7bbcebSAlexander Chiang } 2962f7bbcebSAlexander Chiang 2972f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2982f7bbcebSAlexander Chiang if (!root) 2992f7bbcebSAlexander Chiang goto out; 3002f7bbcebSAlexander Chiang 3012f7bbcebSAlexander Chiang pbus = root->bus; 3022f7bbcebSAlexander Chiang 3032f7bbcebSAlexander Chiang /* 3042f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3052f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3062f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3072f7bbcebSAlexander Chiang */ 3082f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3092f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3102f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3112f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3122f7bbcebSAlexander Chiang goto out; 3132f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3142f7bbcebSAlexander Chiang fn = adr & 0xffff; 3152f7bbcebSAlexander Chiang 3162f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 317412af978STroy Moure if (!pdev || hnd == handle) 3182f7bbcebSAlexander Chiang break; 3192f7bbcebSAlexander Chiang 3202f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3212f7bbcebSAlexander Chiang pci_dev_put(pdev); 322497fb54fSRafael J. Wysocki 323497fb54fSRafael J. Wysocki /* 324497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 325497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 326497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 327497fb54fSRafael J. Wysocki */ 328497fb54fSRafael J. Wysocki if (!pbus) { 329497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 330497fb54fSRafael J. Wysocki pdev = NULL; 331497fb54fSRafael J. Wysocki break; 332497fb54fSRafael J. Wysocki } 3332f7bbcebSAlexander Chiang } 3342f7bbcebSAlexander Chiang out: 3352f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3362f7bbcebSAlexander Chiang kfree(node); 3372f7bbcebSAlexander Chiang 3382f7bbcebSAlexander Chiang return pdev; 3392f7bbcebSAlexander Chiang } 3402f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3412f7bbcebSAlexander Chiang 34263f10f0fSKenji Kaneshige /** 34375fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 34475fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 34575fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 34675fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 34763f10f0fSKenji Kaneshige * 34875fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 34975fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 35075fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 35175fb60f2SRafael J. Wysocki * 35275fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 35375fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 35475fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 35575fb60f2SRafael J. Wysocki * on failure. 35663f10f0fSKenji Kaneshige **/ 35775fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 35863f10f0fSKenji Kaneshige { 35963f10f0fSKenji Kaneshige struct acpi_pci_root *root; 3604ffe6e54SBjorn Helgaas acpi_status status = AE_OK; 36175fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 36263f10f0fSKenji Kaneshige 36375fb60f2SRafael J. Wysocki if (!mask) 36475fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 36575fb60f2SRafael J. Wysocki 36675fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 36775fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 36863f10f0fSKenji Kaneshige return AE_TYPE; 36963f10f0fSKenji Kaneshige 37063f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 37163f10f0fSKenji Kaneshige if (!root) 37263f10f0fSKenji Kaneshige return AE_NOT_EXIST; 37363f10f0fSKenji Kaneshige 37463f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 37575fb60f2SRafael J. Wysocki 37675fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 37763f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 37875fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 37963f10f0fSKenji Kaneshige goto out; 38063f10f0fSKenji Kaneshige 38175fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 38275fb60f2SRafael J. Wysocki while (*mask) { 38375fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 38463f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 38563f10f0fSKenji Kaneshige goto out; 38675fb60f2SRafael J. Wysocki if (ctrl == *mask) 38775fb60f2SRafael J. Wysocki break; 388955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 389955f14b4SBjorn Helgaas ctrl & ~(*mask)); 39075fb60f2SRafael J. Wysocki ctrl = *mask; 39175fb60f2SRafael J. Wysocki } 3922b8fd918SRafael J. Wysocki 39375fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 394955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 395955f14b4SBjorn Helgaas req & ~(ctrl)); 39663f10f0fSKenji Kaneshige status = AE_SUPPORT; 39763f10f0fSKenji Kaneshige goto out; 39863f10f0fSKenji Kaneshige } 39963f10f0fSKenji Kaneshige 400b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 401b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 402b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 40375fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 40463f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 40575fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 40663f10f0fSKenji Kaneshige out: 40763f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 40863f10f0fSKenji Kaneshige return status; 40963f10f0fSKenji Kaneshige } 4109f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 41163f10f0fSKenji Kaneshige 412c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 413c238252fSSinan Kaya bool is_pcie) 4143e43abb0SBjorn Helgaas { 415955f14b4SBjorn Helgaas u32 support, control, requested; 4163e43abb0SBjorn Helgaas acpi_status status; 4173e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4183e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4193e43abb0SBjorn Helgaas 4203e43abb0SBjorn Helgaas /* 4217bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4227bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4237bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4247bc5a2baSMatthew Garrett */ 425630b3affSLukas Wunner if (x86_apple_machine) { 4267bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4277bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4287bc5a2baSMatthew Garrett root->osc_control_set); 4297bc5a2baSMatthew Garrett return; 4307bc5a2baSMatthew Garrett } 4317bc5a2baSMatthew Garrett 4327bc5a2baSMatthew Garrett /* 4333e43abb0SBjorn Helgaas * All supported architectures that use ACPI have support for 4343e43abb0SBjorn Helgaas * PCI domains, so we indicate this in _OSC support capabilities. 4353e43abb0SBjorn Helgaas */ 43665afe916SBjorn Helgaas support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 437ba11edc6SAlexandru Gagniuc support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 4383e43abb0SBjorn Helgaas if (pci_ext_cfg_avail()) 439b8eb67fcSBjorn Helgaas support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4401b2a7be6SBjorn Helgaas if (pcie_aspm_support_enabled()) 441b8eb67fcSBjorn Helgaas support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4423e43abb0SBjorn Helgaas if (pci_msi_enabled()) 443b8eb67fcSBjorn Helgaas support |= OSC_PCI_MSI_SUPPORT; 444955f14b4SBjorn Helgaas 445955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 446b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4473e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 448c238252fSSinan Kaya *no_aspm = 1; 449c238252fSSinan Kaya 450c238252fSSinan Kaya /* _OSC is optional for PCI host bridges */ 451c238252fSSinan Kaya if ((status == AE_NOT_FOUND) && !is_pcie) 452c238252fSSinan Kaya return; 453c238252fSSinan Kaya 4541ad61b61SSinan Kaya dev_info(&device->dev, "_OSC failed (%s)%s\n", 4551ad61b61SSinan Kaya acpi_format_exception(status), 4561ad61b61SSinan Kaya pcie_aspm_support_enabled() ? "; disabling ASPM" : ""); 45765afe916SBjorn Helgaas return; 4583e43abb0SBjorn Helgaas } 4593e43abb0SBjorn Helgaas 46043613a1fSBjorn Helgaas if (pcie_ports_disabled) { 46143613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 46243613a1fSBjorn Helgaas return; 46343613a1fSBjorn Helgaas } 46443613a1fSBjorn Helgaas 465de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 466955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 467955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 468de189662SBjorn Helgaas return; 469de189662SBjorn Helgaas } 470de189662SBjorn Helgaas 471b8eb67fcSBjorn Helgaas control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4723e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_PME_CONTROL; 4733e43abb0SBjorn Helgaas 474af8bb9f8SBjorn Helgaas if (IS_ENABLED(CONFIG_PCIEASPM)) 475af8bb9f8SBjorn Helgaas control |= OSC_PCI_EXPRESS_LTR_CONTROL; 476af8bb9f8SBjorn Helgaas 477408fec36SMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 478408fec36SMika Westerberg control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 479408fec36SMika Westerberg 4801df81a6dSMika Westerberg if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 4811df81a6dSMika Westerberg control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 4821df81a6dSMika Westerberg 4833e43abb0SBjorn Helgaas if (pci_aer_available()) { 4843e43abb0SBjorn Helgaas if (aer_acpi_firmware_first()) 485955f14b4SBjorn Helgaas dev_info(&device->dev, 486955f14b4SBjorn Helgaas "PCIe AER handled by firmware\n"); 4873e43abb0SBjorn Helgaas else 488b8eb67fcSBjorn Helgaas control |= OSC_PCI_EXPRESS_AER_CONTROL; 4893e43abb0SBjorn Helgaas } 4903e43abb0SBjorn Helgaas 491955f14b4SBjorn Helgaas requested = control; 492b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 4933e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 4943e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 495955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 4963e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 4973e43abb0SBjorn Helgaas /* 498387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 499387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 500387d3757SMatthew Garrett * intact and prevent the OS from touching it. 5013e43abb0SBjorn Helgaas */ 502387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 503387d3757SMatthew Garrett *no_aspm = 1; 5043e43abb0SBjorn Helgaas } 5053e43abb0SBjorn Helgaas } else { 506955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 507955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 508955f14b4SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 509955f14b4SBjorn Helgaas acpi_format_exception(status)); 510955f14b4SBjorn Helgaas 5113e43abb0SBjorn Helgaas /* 5123e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5133e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5143e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5153e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5163e43abb0SBjorn Helgaas * root scan. 5173e43abb0SBjorn Helgaas */ 5183e43abb0SBjorn Helgaas *no_aspm = 1; 5193e43abb0SBjorn Helgaas } 5203e43abb0SBjorn Helgaas } 5213e43abb0SBjorn Helgaas 52200c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 52300c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5241da177e4SLinus Torvalds { 525f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 526f5eebbe1SBjorn Helgaas acpi_status status; 527f5eebbe1SBjorn Helgaas int result; 528f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 529bfe2414aSJiang Liu acpi_handle handle = device->handle; 530387d3757SMatthew Garrett int no_aspm = 0; 5319762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 532c238252fSSinan Kaya bool is_pcie; 5331da177e4SLinus Torvalds 5346ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5356ad95513SBjorn Helgaas if (!root) 5366ad95513SBjorn Helgaas return -ENOMEM; 5376ad95513SBjorn Helgaas 538f5eebbe1SBjorn Helgaas segment = 0; 539bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 540f5eebbe1SBjorn Helgaas &segment); 541f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5426dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5436ad95513SBjorn Helgaas result = -ENODEV; 5446ad95513SBjorn Helgaas goto end; 545f5eebbe1SBjorn Helgaas } 5461da177e4SLinus Torvalds 547f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5486ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 549bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 550f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5516ad95513SBjorn Helgaas /* 5526ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5536ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5546ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5556ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5566ad95513SBjorn Helgaas */ 5576ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5586dc7d22cSJiang Liu dev_warn(&device->dev, 5596dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 560bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 561e545b55aSJon Mason NULL, &bus); 5626ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5636ad95513SBjorn Helgaas root->secondary.start = bus; 5646ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5656ad95513SBjorn Helgaas root->secondary.start = 0; 5666ad95513SBjorn Helgaas else { 5676dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5686ad95513SBjorn Helgaas result = -ENODEV; 5696ad95513SBjorn Helgaas goto end; 570f5eebbe1SBjorn Helgaas } 571f5eebbe1SBjorn Helgaas } 5721da177e4SLinus Torvalds 57332917e5bSPatrick Mochel root->device = device; 5740705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5751da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5761da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 577db89b4f0SPavel Machek device->driver_data = root; 5781da177e4SLinus Torvalds 579864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 580864b94adSJiang Liu result = -ENXIO; 581864b94adSJiang Liu goto end; 582864b94adSJiang Liu } 583864b94adSJiang Liu 5846dc7d22cSJiang Liu pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", 585d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 586d4761ba2SBjorn Helgaas root->segment, &root->secondary); 587d4761ba2SBjorn Helgaas 588bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 589f4b57a3bSJiang Liu 590c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 591c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 592415e12b2SRafael J. Wysocki 5933dc48af3SNeil Horman /* 5943dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5953dc48af3SNeil Horman */ 5963dc48af3SNeil Horman 5973dc48af3SNeil Horman /* 5983dc48af3SNeil Horman * Scan the Root Bridge 5993dc48af3SNeil Horman * -------------------- 6003dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 6013dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 6023dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 6033dc48af3SNeil Horman */ 6043dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 6053dc48af3SNeil Horman if (!root->bus) { 6063dc48af3SNeil Horman dev_err(&device->dev, 6073dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6083dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 609f516bde5SRafael J. Wysocki device->driver_data = NULL; 6103dc48af3SNeil Horman result = -ENODEV; 611864b94adSJiang Liu goto remove_dmar; 6123dc48af3SNeil Horman } 6133dc48af3SNeil Horman 6143dc48af3SNeil Horman if (no_aspm) 6153dc48af3SNeil Horman pcie_no_aspm(); 6163dc48af3SNeil Horman 617c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 618de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 619b67ea761SRafael J. Wysocki 620864b94adSJiang Liu if (hotadd) { 6213c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 62239772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 623584c5c42SRui Wang /* 624584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 625584c5c42SRui Wang * case, we need to wait until after PCI initialization in 626584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 627584c5c42SRui Wang * 628584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 629584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 630584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 631584c5c42SRui Wang * (see drivers/acpi/Kconfig). 632584c5c42SRui Wang */ 633fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 634516ca223SJiang Liu } 63562a08c5aSYinghai Lu 6367a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 637c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6387a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 63900c43b96SRafael J. Wysocki return 1; 64047525cdaSRafael J. Wysocki 641864b94adSJiang Liu remove_dmar: 642864b94adSJiang Liu if (hotadd) 643864b94adSJiang Liu dmar_device_remove(handle); 64447525cdaSRafael J. Wysocki end: 64547525cdaSRafael J. Wysocki kfree(root); 64647525cdaSRafael J. Wysocki return result; 647c431ada4SRajesh Shah } 6481da177e4SLinus Torvalds 64900c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6501da177e4SLinus Torvalds { 651caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 652c8e9afb1SJiang Liu 6537a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6547a3bb55eSRafael J. Wysocki 6559738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6569738a1fdSYinghai Lu 657f2ae5da7SRui Wang pci_ioapic_remove(root); 658de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 659b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 660b67ea761SRafael J. Wysocki 6619738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 662f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6639738a1fdSYinghai Lu 664864b94adSJiang Liu dmar_device_remove(device->handle); 665864b94adSJiang Liu 6667a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6677a3bb55eSRafael J. Wysocki 6681da177e4SLinus Torvalds kfree(root); 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6712c204383SJiang Liu /* 6722c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6732c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6742c204383SJiang Liu * and ARM64. 6752c204383SJiang Liu */ 6762c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6772c204383SJiang Liu struct list_head *resources, 6782c204383SJiang Liu unsigned long type) 6792c204383SJiang Liu { 6802c204383SJiang Liu LIST_HEAD(list); 6812c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6822c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6832c204383SJiang Liu 6842c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6852c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6862c204383SJiang Liu 6872c204383SJiang Liu list_splice_init(resources, &list); 6882c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6892c204383SJiang Liu bool free = false; 6902c204383SJiang Liu resource_size_t end; 6912c204383SJiang Liu 6922c204383SJiang Liu res1 = entry->res; 6932c204383SJiang Liu if (!(res1->flags & type)) 6942c204383SJiang Liu goto next; 6952c204383SJiang Liu 6962c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 6972c204383SJiang Liu end = min(res1->end, root->end); 6982c204383SJiang Liu if (end <= res1->start) { 6992c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 7002c204383SJiang Liu res1); 7012c204383SJiang Liu free = true; 7022c204383SJiang Liu goto next; 7032c204383SJiang Liu } else if (res1->end != end) { 7042c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 7052c204383SJiang Liu res1, (unsigned long long)end + 1, 7062c204383SJiang Liu (unsigned long long)res1->end); 7072c204383SJiang Liu res1->end = end; 7082c204383SJiang Liu } 7092c204383SJiang Liu 7102c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7112c204383SJiang Liu res2 = entry2->res; 7122c204383SJiang Liu if (!(res2->flags & type)) 7132c204383SJiang Liu continue; 7142c204383SJiang Liu 7152c204383SJiang Liu /* 7162c204383SJiang Liu * I don't like throwing away windows because then 7172c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7182c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7192c204383SJiang Liu */ 7202c204383SJiang Liu if (resource_overlaps(res1, res2)) { 7212c204383SJiang Liu res2->start = min(res1->start, res2->start); 7222c204383SJiang Liu res2->end = max(res1->end, res2->end); 7232c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7242c204383SJiang Liu res2, res1); 7252c204383SJiang Liu free = true; 7262c204383SJiang Liu goto next; 7272c204383SJiang Liu } 7282c204383SJiang Liu } 7292c204383SJiang Liu 7302c204383SJiang Liu next: 7312c204383SJiang Liu resource_list_del(entry); 7322c204383SJiang Liu if (free) 7332c204383SJiang Liu resource_list_free_entry(entry); 7342c204383SJiang Liu else 7352c204383SJiang Liu resource_list_add_tail(entry, resources); 7362c204383SJiang Liu } 7372c204383SJiang Liu } 7382c204383SJiang Liu 739fcfaab30SGabriele Paoloni static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, 740fcfaab30SGabriele Paoloni struct resource_entry *entry) 7410a70abb3SJayachandran C { 7420a70abb3SJayachandran C #ifdef PCI_IOBASE 7430a70abb3SJayachandran C struct resource *res = entry->res; 7440a70abb3SJayachandran C resource_size_t cpu_addr = res->start; 7450a70abb3SJayachandran C resource_size_t pci_addr = cpu_addr - entry->offset; 7460a70abb3SJayachandran C resource_size_t length = resource_size(res); 7470a70abb3SJayachandran C unsigned long port; 7480a70abb3SJayachandran C 749fcfaab30SGabriele Paoloni if (pci_register_io_range(fwnode, cpu_addr, length)) 7500a70abb3SJayachandran C goto err; 7510a70abb3SJayachandran C 7520a70abb3SJayachandran C port = pci_address_to_pio(cpu_addr); 7530a70abb3SJayachandran C if (port == (unsigned long)-1) 7540a70abb3SJayachandran C goto err; 7550a70abb3SJayachandran C 7560a70abb3SJayachandran C res->start = port; 7570a70abb3SJayachandran C res->end = port + length - 1; 7580a70abb3SJayachandran C entry->offset = port - pci_addr; 7590a70abb3SJayachandran C 7600a70abb3SJayachandran C if (pci_remap_iospace(res, cpu_addr) < 0) 7610a70abb3SJayachandran C goto err; 7620a70abb3SJayachandran C 7630a70abb3SJayachandran C pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); 7640a70abb3SJayachandran C return; 7650a70abb3SJayachandran C err: 7660a70abb3SJayachandran C res->flags |= IORESOURCE_DISABLED; 7670a70abb3SJayachandran C #endif 7680a70abb3SJayachandran C } 7690a70abb3SJayachandran C 7702c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7712c204383SJiang Liu { 7722c204383SJiang Liu int ret; 7732c204383SJiang Liu struct list_head *list = &info->resources; 7742c204383SJiang Liu struct acpi_device *device = info->bridge; 7752c204383SJiang Liu struct resource_entry *entry, *tmp; 7762c204383SJiang Liu unsigned long flags; 7772c204383SJiang Liu 7782c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7792c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7802c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7812c204383SJiang Liu (void *)flags); 7822c204383SJiang Liu if (ret < 0) 7832c204383SJiang Liu dev_warn(&device->dev, 7842c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7852c204383SJiang Liu else if (ret == 0) 7862c204383SJiang Liu dev_dbg(&device->dev, 7872c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 7882c204383SJiang Liu else { 7892c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 7900a70abb3SJayachandran C if (entry->res->flags & IORESOURCE_IO) 791fcfaab30SGabriele Paoloni acpi_pci_root_remap_iospace(&device->fwnode, 792fcfaab30SGabriele Paoloni entry); 7930a70abb3SJayachandran C 7942c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 7952c204383SJiang Liu resource_list_destroy_entry(entry); 7962c204383SJiang Liu else 7972c204383SJiang Liu entry->res->name = info->name; 7982c204383SJiang Liu } 7992c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8002c204383SJiang Liu IORESOURCE_MEM); 8012c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 8022c204383SJiang Liu IORESOURCE_IO); 8032c204383SJiang Liu } 8042c204383SJiang Liu 8052c204383SJiang Liu return ret; 8062c204383SJiang Liu } 8072c204383SJiang Liu 8082c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 8092c204383SJiang Liu { 8102c204383SJiang Liu struct resource_entry *entry, *tmp; 8112c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 8122c204383SJiang Liu 8132c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8142c204383SJiang Liu res = entry->res; 8152c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 8162c204383SJiang Liu root = &iomem_resource; 8172c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 8182c204383SJiang Liu root = &ioport_resource; 8192c204383SJiang Liu else 8202c204383SJiang Liu continue; 8212c204383SJiang Liu 822727ae8beSLiu Jiang /* 823727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 824727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 825727ae8beSLiu Jiang */ 826727ae8beSLiu Jiang if (res == root) 827727ae8beSLiu Jiang continue; 828727ae8beSLiu Jiang 8292c204383SJiang Liu conflict = insert_resource_conflict(root, res); 8302c204383SJiang Liu if (conflict) { 8312c204383SJiang Liu dev_info(&info->bridge->dev, 8322c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 8332c204383SJiang Liu res, conflict->name, conflict); 8342c204383SJiang Liu resource_list_destroy_entry(entry); 8352c204383SJiang Liu } 8362c204383SJiang Liu } 8372c204383SJiang Liu } 8382c204383SJiang Liu 8392c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 8402c204383SJiang Liu { 8412c204383SJiang Liu struct resource *res; 8422c204383SJiang Liu struct resource_entry *entry, *tmp; 8432c204383SJiang Liu 8442c204383SJiang Liu if (!info) 8452c204383SJiang Liu return; 8462c204383SJiang Liu 8472c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8482c204383SJiang Liu res = entry->res; 8492c204383SJiang Liu if (res->parent && 8502c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8512c204383SJiang Liu release_resource(res); 8522c204383SJiang Liu resource_list_destroy_entry(entry); 8532c204383SJiang Liu } 8542c204383SJiang Liu 8552c204383SJiang Liu info->ops->release_info(info); 8562c204383SJiang Liu } 8572c204383SJiang Liu 8582c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8592c204383SJiang Liu { 8602c204383SJiang Liu struct resource *res; 8612c204383SJiang Liu struct resource_entry *entry; 8622c204383SJiang Liu 8632c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8642c204383SJiang Liu res = entry->res; 8650a70abb3SJayachandran C if (res->flags & IORESOURCE_IO) 8660a70abb3SJayachandran C pci_unmap_iospace(res); 8672c204383SJiang Liu if (res->parent && 8682c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8692c204383SJiang Liu release_resource(res); 8702c204383SJiang Liu } 8712c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8722c204383SJiang Liu } 8732c204383SJiang Liu 8742c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8752c204383SJiang Liu struct acpi_pci_root_ops *ops, 8762c204383SJiang Liu struct acpi_pci_root_info *info, 8772c204383SJiang Liu void *sysdata) 8782c204383SJiang Liu { 8792c204383SJiang Liu int ret, busnum = root->secondary.start; 8802c204383SJiang Liu struct acpi_device *device = root->device; 8812c204383SJiang Liu int node = acpi_get_node(device->handle); 8822c204383SJiang Liu struct pci_bus *bus; 88302bfeb48SBjorn Helgaas struct pci_host_bridge *host_bridge; 8842c204383SJiang Liu 8852c204383SJiang Liu info->root = root; 8862c204383SJiang Liu info->bridge = device; 8872c204383SJiang Liu info->ops = ops; 8882c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8892c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8902c204383SJiang Liu root->segment, busnum); 8912c204383SJiang Liu 8922c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 8932c204383SJiang Liu goto out_release_info; 8942c204383SJiang Liu if (ops->prepare_resources) 8952c204383SJiang Liu ret = ops->prepare_resources(info); 8962c204383SJiang Liu else 8972c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 8982c204383SJiang Liu if (ret < 0) 8992c204383SJiang Liu goto out_release_info; 9002c204383SJiang Liu 9012c204383SJiang Liu pci_acpi_root_add_resources(info); 9022c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 9032c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 9042c204383SJiang Liu sysdata, &info->resources); 9052c204383SJiang Liu if (!bus) 9062c204383SJiang Liu goto out_release_info; 9072c204383SJiang Liu 90802bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 90902bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9109310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9111df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9121df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 91302bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 91402bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 91502bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 91602bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 917af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 918af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 91902bfeb48SBjorn Helgaas 9202c204383SJiang Liu pci_scan_child_bus(bus); 92102bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 92202bfeb48SBjorn Helgaas info); 9232c204383SJiang Liu if (node != NUMA_NO_NODE) 9242c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9252c204383SJiang Liu return bus; 9262c204383SJiang Liu 9272c204383SJiang Liu out_release_info: 9282c204383SJiang Liu __acpi_pci_root_release_info(info); 9292c204383SJiang Liu return NULL; 9302c204383SJiang Liu } 9312c204383SJiang Liu 93200c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9331da177e4SLinus Torvalds { 934d3072e6aSRafael J. Wysocki acpi_hest_init(); 9353338db00SRafael J. Wysocki if (acpi_pci_disabled) 9363338db00SRafael J. Wysocki return; 937d3072e6aSRafael J. Wysocki 9387bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9393338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 940668192b6SYinghai Lu } 941