1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 61da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 9ccde83e3SHanjun Guo #define pr_fmt(fmt) "ACPI: " fmt 10ccde83e3SHanjun Guo 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/types.h> 15d0020f65STaku Izumi #include <linux/mutex.h> 161da177e4SLinus Torvalds #include <linux/pm.h> 17b67ea761SRafael J. Wysocki #include <linux/pm_runtime.h> 181da177e4SLinus Torvalds #include <linux/pci.h> 19990a7ac5SAndrew Patterson #include <linux/pci-acpi.h> 20864b94adSJiang Liu #include <linux/dmar.h> 211da177e4SLinus Torvalds #include <linux/acpi.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 237bc5a2baSMatthew Garrett #include <linux/dmi.h> 24630b3affSLukas Wunner #include <linux/platform_data/x86/apple.h> 258b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 261da177e4SLinus Torvalds 27ace8238bSRafael J. Wysocki #include "internal.h" 28ace8238bSRafael J. Wysocki 291da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 301da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 3100c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 3200c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 3300c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 341da177e4SLinus Torvalds 353338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 363338db00SRafael J. Wysocki { 371f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 383338db00SRafael J. Wysocki return 0; 393338db00SRafael J. Wysocki } 403338db00SRafael J. Wysocki 417dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 427dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 437dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 447dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 45415e12b2SRafael J. Wysocki 46c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 471ba90e3aSThomas Renninger {"PNP0A03", 0}, 481ba90e3aSThomas Renninger {"", 0}, 491ba90e3aSThomas Renninger }; 501ba90e3aSThomas Renninger 5100c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 521ba90e3aSThomas Renninger .ids = root_device_ids, 5300c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 5400c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 55ca499fc8SToshi Kani .hotplug = { 563338db00SRafael J. Wysocki .enabled = true, 573338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 58ca499fc8SToshi Kani }, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 6127558203SAlexander Chiang /** 6227558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 638e8883ceSTian Tao * @handle: the ACPI CA node in question. 6427558203SAlexander Chiang * 6527558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6627558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 6727558203SAlexander Chiang */ 6827558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 6927558203SAlexander Chiang { 7027558203SAlexander Chiang int ret; 7127558203SAlexander Chiang struct acpi_device *device; 7227558203SAlexander Chiang 7327558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 7427558203SAlexander Chiang if (ret) 7527558203SAlexander Chiang return 0; 7627558203SAlexander Chiang 7727558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 7827558203SAlexander Chiang if (ret) 7927558203SAlexander Chiang return 0; 8027558203SAlexander Chiang else 8127558203SAlexander Chiang return 1; 8227558203SAlexander Chiang } 8327558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8427558203SAlexander Chiang 851da177e4SLinus Torvalds static acpi_status 861da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 871da177e4SLinus Torvalds { 886ad95513SBjorn Helgaas struct resource *res = data; 891da177e4SLinus Torvalds struct acpi_resource_address64 address; 90f6c1c8ffSBjorn Helgaas acpi_status status; 911da177e4SLinus Torvalds 92f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 93f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 941da177e4SLinus Torvalds return AE_OK; 951da177e4SLinus Torvalds 96a45de93eSLv Zheng if ((address.address.address_length > 0) && 976ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 98a45de93eSLv Zheng res->start = address.address.minimum; 99a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 1006ad95513SBjorn Helgaas } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds return AE_OK; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 105f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1066ad95513SBjorn Helgaas struct resource *res) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds acpi_status status; 1091da177e4SLinus Torvalds 1106ad95513SBjorn Helgaas res->start = -1; 1114be44fcdSLen Brown status = 1124be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1136ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1141da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1151da177e4SLinus Torvalds return status; 1166ad95513SBjorn Helgaas if (res->start == -1) 1171da177e4SLinus Torvalds return AE_ERROR; 1181da177e4SLinus Torvalds return AE_OK; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 121955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 122955f14b4SBjorn Helgaas u32 bit; 123955f14b4SBjorn Helgaas char *desc; 124955f14b4SBjorn Helgaas }; 125955f14b4SBjorn Helgaas 126955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 127955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 128955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 129955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 130955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 131955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 132ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EDR_SUPPORT, "EDR" }, 133ba11edc6SAlexandru Gagniuc { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, 134955f14b4SBjorn Helgaas }; 135955f14b4SBjorn Helgaas 136955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 137955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 138955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 139955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 140955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 141955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 142af8bb9f8SBjorn Helgaas { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, 143ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, 144955f14b4SBjorn Helgaas }; 145955f14b4SBjorn Helgaas 146955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 147955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 148955f14b4SBjorn Helgaas { 149955f14b4SBjorn Helgaas char buf[80]; 150955f14b4SBjorn Helgaas int i, len = 0; 151955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 152955f14b4SBjorn Helgaas 153955f14b4SBjorn Helgaas buf[0] = '\0'; 154955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 155955f14b4SBjorn Helgaas if (word & entry->bit) 156edd66086STakashi Iwai len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", 157955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 158955f14b4SBjorn Helgaas 159955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 160955f14b4SBjorn Helgaas } 161955f14b4SBjorn Helgaas 162955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 163955f14b4SBjorn Helgaas { 164955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 165955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 166955f14b4SBjorn Helgaas } 167955f14b4SBjorn Helgaas 168955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 169955f14b4SBjorn Helgaas { 170955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 171955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 172955f14b4SBjorn Helgaas } 173955f14b4SBjorn Helgaas 1743a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17563f10f0fSKenji Kaneshige 17663f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17763f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 17863f10f0fSKenji Kaneshige { 1793a9622dcSShaohua Li struct acpi_osc_context context = { 1803a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1813a9622dcSShaohua Li .rev = 1, 1823a9622dcSShaohua Li .cap.length = 12, 1833a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1843a9622dcSShaohua Li }; 18563f10f0fSKenji Kaneshige acpi_status status; 18663f10f0fSKenji Kaneshige 1873a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1883a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1893a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1903a9622dcSShaohua Li kfree(context.ret.pointer); 19163f10f0fSKenji Kaneshige } 19263f10f0fSKenji Kaneshige return status; 19363f10f0fSKenji Kaneshige } 19463f10f0fSKenji Kaneshige 195ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 196ab8e8957SRafael J. Wysocki u32 support, 197ab8e8957SRafael J. Wysocki u32 *control) 19863f10f0fSKenji Kaneshige { 19963f10f0fSKenji Kaneshige acpi_status status; 200ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 20163f10f0fSKenji Kaneshige 202ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 203ab8e8957SRafael J. Wysocki 204b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 205b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 206b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 20763f10f0fSKenji Kaneshige 20863f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 20963f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 210ab8e8957SRafael J. Wysocki root->osc_support_set = support; 211ab8e8957SRafael J. Wysocki *control = result; 212ab8e8957SRafael J. Wysocki } 21363f10f0fSKenji Kaneshige return status; 21463f10f0fSKenji Kaneshige } 21563f10f0fSKenji Kaneshige 21676d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 21763f10f0fSKenji Kaneshige { 21863f10f0fSKenji Kaneshige struct acpi_pci_root *root; 219cd4faf9cSTaku Izumi struct acpi_device *device; 220c1aec834SBjorn Helgaas 221cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 222cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 22363f10f0fSKenji Kaneshige return NULL; 224cd4faf9cSTaku Izumi 225cd4faf9cSTaku Izumi root = acpi_driver_data(device); 226cd4faf9cSTaku Izumi 227cd4faf9cSTaku Izumi return root; 22863f10f0fSKenji Kaneshige } 22976d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 23063f10f0fSKenji Kaneshige 2312f7bbcebSAlexander Chiang struct acpi_handle_node { 2322f7bbcebSAlexander Chiang struct list_head node; 2332f7bbcebSAlexander Chiang acpi_handle handle; 2342f7bbcebSAlexander Chiang }; 2352f7bbcebSAlexander Chiang 2362f7bbcebSAlexander Chiang /** 2372f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2382f7bbcebSAlexander Chiang * @handle: the handle in question 2392f7bbcebSAlexander Chiang * 2402f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2412f7bbcebSAlexander Chiang * list of PCI devices. 2422f7bbcebSAlexander Chiang * 2432f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2442f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2452f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2462f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2472f7bbcebSAlexander Chiang */ 2482f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2492f7bbcebSAlexander Chiang { 2502f7bbcebSAlexander Chiang int dev, fn; 2512f7bbcebSAlexander Chiang unsigned long long adr; 2522f7bbcebSAlexander Chiang acpi_status status; 2532f7bbcebSAlexander Chiang acpi_handle phandle; 2542f7bbcebSAlexander Chiang struct pci_bus *pbus; 2552f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2562f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2572f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2582f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2592f7bbcebSAlexander Chiang 2602f7bbcebSAlexander Chiang /* 2612f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2622f7bbcebSAlexander Chiang */ 2632f7bbcebSAlexander Chiang phandle = handle; 2642f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2652f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2662f7bbcebSAlexander Chiang if (!node) 2672f7bbcebSAlexander Chiang goto out; 2682f7bbcebSAlexander Chiang 2692f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2702f7bbcebSAlexander Chiang node->handle = phandle; 2712f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2722f7bbcebSAlexander Chiang 2732f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2742f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2752f7bbcebSAlexander Chiang goto out; 2762f7bbcebSAlexander Chiang } 2772f7bbcebSAlexander Chiang 2782f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2792f7bbcebSAlexander Chiang if (!root) 2802f7bbcebSAlexander Chiang goto out; 2812f7bbcebSAlexander Chiang 2822f7bbcebSAlexander Chiang pbus = root->bus; 2832f7bbcebSAlexander Chiang 2842f7bbcebSAlexander Chiang /* 2852f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 2862f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 2872f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 2882f7bbcebSAlexander Chiang */ 2892f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 2902f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 2912f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 2922f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2932f7bbcebSAlexander Chiang goto out; 2942f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 2952f7bbcebSAlexander Chiang fn = adr & 0xffff; 2962f7bbcebSAlexander Chiang 2972f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 298412af978STroy Moure if (!pdev || hnd == handle) 2992f7bbcebSAlexander Chiang break; 3002f7bbcebSAlexander Chiang 3012f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3022f7bbcebSAlexander Chiang pci_dev_put(pdev); 303497fb54fSRafael J. Wysocki 304497fb54fSRafael J. Wysocki /* 305497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 306497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 307497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 308497fb54fSRafael J. Wysocki */ 309497fb54fSRafael J. Wysocki if (!pbus) { 310497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 311497fb54fSRafael J. Wysocki pdev = NULL; 312497fb54fSRafael J. Wysocki break; 313497fb54fSRafael J. Wysocki } 3142f7bbcebSAlexander Chiang } 3152f7bbcebSAlexander Chiang out: 3162f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3172f7bbcebSAlexander Chiang kfree(node); 3182f7bbcebSAlexander Chiang 3192f7bbcebSAlexander Chiang return pdev; 3202f7bbcebSAlexander Chiang } 3212f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3222f7bbcebSAlexander Chiang 32363f10f0fSKenji Kaneshige /** 32475fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 32575fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 32675fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 327*843438deSYang Li * @support: _OSC supported capability. 32863f10f0fSKenji Kaneshige * 32975fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 33075fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 33175fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 33275fb60f2SRafael J. Wysocki * 33375fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 33475fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 33575fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 33675fb60f2SRafael J. Wysocki * on failure. 33763f10f0fSKenji Kaneshige **/ 3386bc779eeSJoerg Roedel static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 support) 33963f10f0fSKenji Kaneshige { 3406bc779eeSJoerg Roedel u32 req = OSC_PCI_EXPRESS_CAPABILITY_CONTROL; 34163f10f0fSKenji Kaneshige struct acpi_pci_root *root; 342866e61fcSBjorn Helgaas acpi_status status; 34375fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 34463f10f0fSKenji Kaneshige 34575fb60f2SRafael J. Wysocki if (!mask) 34675fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 34775fb60f2SRafael J. Wysocki 34863f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 34963f10f0fSKenji Kaneshige if (!root) 35063f10f0fSKenji Kaneshige return AE_NOT_EXIST; 35163f10f0fSKenji Kaneshige 3526bc779eeSJoerg Roedel ctrl = *mask; 3536bc779eeSJoerg Roedel *mask |= root->osc_control_set; 35463f10f0fSKenji Kaneshige 35575fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 3566bc779eeSJoerg Roedel do { 3576bc779eeSJoerg Roedel status = acpi_pci_query_osc(root, support, mask); 35863f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 359866e61fcSBjorn Helgaas return status; 36075fb60f2SRafael J. Wysocki if (ctrl == *mask) 36175fb60f2SRafael J. Wysocki break; 362955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 363955f14b4SBjorn Helgaas ctrl & ~(*mask)); 36475fb60f2SRafael J. Wysocki ctrl = *mask; 3656bc779eeSJoerg Roedel } while (*mask); 3666bc779eeSJoerg Roedel 3676bc779eeSJoerg Roedel /* No need to request _OSC if the control was already granted. */ 3686bc779eeSJoerg Roedel if ((root->osc_control_set & ctrl) == ctrl) 3696bc779eeSJoerg Roedel return AE_OK; 3702b8fd918SRafael J. Wysocki 37175fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 372955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 373955f14b4SBjorn Helgaas req & ~(ctrl)); 374866e61fcSBjorn Helgaas return AE_SUPPORT; 37563f10f0fSKenji Kaneshige } 37663f10f0fSKenji Kaneshige 377b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 378b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 379b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 38075fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 381866e61fcSBjorn Helgaas if (ACPI_FAILURE(status)) 38263f10f0fSKenji Kaneshige return status; 383866e61fcSBjorn Helgaas 384866e61fcSBjorn Helgaas root->osc_control_set = *mask; 385866e61fcSBjorn Helgaas return AE_OK; 38663f10f0fSKenji Kaneshige } 38763f10f0fSKenji Kaneshige 3884c6f6060SJoerg Roedel static u32 calculate_support(void) 3894c6f6060SJoerg Roedel { 3904c6f6060SJoerg Roedel u32 support; 3914c6f6060SJoerg Roedel 3924c6f6060SJoerg Roedel /* 3934c6f6060SJoerg Roedel * All supported architectures that use ACPI have support for 3944c6f6060SJoerg Roedel * PCI domains, so we indicate this in _OSC support capabilities. 3954c6f6060SJoerg Roedel */ 3964c6f6060SJoerg Roedel support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 3974c6f6060SJoerg Roedel support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 3984c6f6060SJoerg Roedel if (pci_ext_cfg_avail()) 3994c6f6060SJoerg Roedel support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4004c6f6060SJoerg Roedel if (pcie_aspm_support_enabled()) 4014c6f6060SJoerg Roedel support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4024c6f6060SJoerg Roedel if (pci_msi_enabled()) 4034c6f6060SJoerg Roedel support |= OSC_PCI_MSI_SUPPORT; 4044c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_EDR)) 4054c6f6060SJoerg Roedel support |= OSC_PCI_EDR_SUPPORT; 4064c6f6060SJoerg Roedel 4074c6f6060SJoerg Roedel return support; 4084c6f6060SJoerg Roedel } 4094c6f6060SJoerg Roedel 4104c6f6060SJoerg Roedel static u32 calculate_control(void) 4114c6f6060SJoerg Roedel { 4124c6f6060SJoerg Roedel u32 control; 4134c6f6060SJoerg Roedel 4144c6f6060SJoerg Roedel control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4154c6f6060SJoerg Roedel | OSC_PCI_EXPRESS_PME_CONTROL; 4164c6f6060SJoerg Roedel 4174c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIEASPM)) 4184c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_LTR_CONTROL; 4194c6f6060SJoerg Roedel 4204c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 4214c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 4224c6f6060SJoerg Roedel 4234c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 4244c6f6060SJoerg Roedel control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 4254c6f6060SJoerg Roedel 4264c6f6060SJoerg Roedel if (pci_aer_available()) 4274c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_AER_CONTROL; 4284c6f6060SJoerg Roedel 4294c6f6060SJoerg Roedel /* 4304c6f6060SJoerg Roedel * Per the Downstream Port Containment Related Enhancements ECN to 4314c6f6060SJoerg Roedel * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, 4324c6f6060SJoerg Roedel * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC 4334c6f6060SJoerg Roedel * and EDR. 4344c6f6060SJoerg Roedel */ 4354c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) 4364c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_DPC_CONTROL; 4374c6f6060SJoerg Roedel 4384c6f6060SJoerg Roedel return control; 4394c6f6060SJoerg Roedel } 4404c6f6060SJoerg Roedel 44187f1f87aSJoerg Roedel static bool os_control_query_checks(struct acpi_pci_root *root, u32 support) 44287f1f87aSJoerg Roedel { 44387f1f87aSJoerg Roedel struct acpi_device *device = root->device; 44487f1f87aSJoerg Roedel 44587f1f87aSJoerg Roedel if (pcie_ports_disabled) { 44687f1f87aSJoerg Roedel dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 44787f1f87aSJoerg Roedel return false; 44887f1f87aSJoerg Roedel } 44987f1f87aSJoerg Roedel 45087f1f87aSJoerg Roedel if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 45187f1f87aSJoerg Roedel decode_osc_support(root, "not requesting OS control; OS requires", 45287f1f87aSJoerg Roedel ACPI_PCIE_REQ_SUPPORT); 45387f1f87aSJoerg Roedel return false; 45487f1f87aSJoerg Roedel } 45587f1f87aSJoerg Roedel 45687f1f87aSJoerg Roedel return true; 45787f1f87aSJoerg Roedel } 45887f1f87aSJoerg Roedel 459c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 460c238252fSSinan Kaya bool is_pcie) 4613e43abb0SBjorn Helgaas { 4626bc779eeSJoerg Roedel u32 support, control = 0, requested = 0; 4633e43abb0SBjorn Helgaas acpi_status status; 4643e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4653e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4663e43abb0SBjorn Helgaas 4673e43abb0SBjorn Helgaas /* 4687bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4697bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4707bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4717bc5a2baSMatthew Garrett */ 472630b3affSLukas Wunner if (x86_apple_machine) { 4737bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4747bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4757bc5a2baSMatthew Garrett root->osc_control_set); 4767bc5a2baSMatthew Garrett return; 4777bc5a2baSMatthew Garrett } 4787bc5a2baSMatthew Garrett 4794c6f6060SJoerg Roedel support = calculate_support(); 480955f14b4SBjorn Helgaas 481955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 482c238252fSSinan Kaya 4836bc779eeSJoerg Roedel if (os_control_query_checks(root, support)) 4844c6f6060SJoerg Roedel requested = control = calculate_control(); 4853e43abb0SBjorn Helgaas 4866bc779eeSJoerg Roedel status = acpi_pci_osc_control_set(handle, &control, support); 4873e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 4886bc779eeSJoerg Roedel if (control) 489955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 4906bc779eeSJoerg Roedel 4913e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 4923e43abb0SBjorn Helgaas /* 493387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 494387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 495387d3757SMatthew Garrett * intact and prevent the OS from touching it. 4963e43abb0SBjorn Helgaas */ 497387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 498387d3757SMatthew Garrett *no_aspm = 1; 4993e43abb0SBjorn Helgaas } 5003e43abb0SBjorn Helgaas } else { 5013e43abb0SBjorn Helgaas /* 5023e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5033e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5043e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5053e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5063e43abb0SBjorn Helgaas * root scan. 5073e43abb0SBjorn Helgaas */ 5083e43abb0SBjorn Helgaas *no_aspm = 1; 5096bc779eeSJoerg Roedel 5106bc779eeSJoerg Roedel /* _OSC is optional for PCI host bridges */ 5116bc779eeSJoerg Roedel if ((status == AE_NOT_FOUND) && !is_pcie) 5126bc779eeSJoerg Roedel return; 5136bc779eeSJoerg Roedel 5146bc779eeSJoerg Roedel if (control) { 5156bc779eeSJoerg Roedel decode_osc_control(root, "OS requested", requested); 5166bc779eeSJoerg Roedel decode_osc_control(root, "platform willing to grant", control); 5176bc779eeSJoerg Roedel } 5186bc779eeSJoerg Roedel 5196bc779eeSJoerg Roedel dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", 5206bc779eeSJoerg Roedel acpi_format_exception(status)); 5213e43abb0SBjorn Helgaas } 5223e43abb0SBjorn Helgaas } 5233e43abb0SBjorn Helgaas 52400c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 52500c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5261da177e4SLinus Torvalds { 527f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 528f5eebbe1SBjorn Helgaas acpi_status status; 529f5eebbe1SBjorn Helgaas int result; 530f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 531bfe2414aSJiang Liu acpi_handle handle = device->handle; 532387d3757SMatthew Garrett int no_aspm = 0; 5339762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 534c238252fSSinan Kaya bool is_pcie; 5351da177e4SLinus Torvalds 5366ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5376ad95513SBjorn Helgaas if (!root) 5386ad95513SBjorn Helgaas return -ENOMEM; 5396ad95513SBjorn Helgaas 540f5eebbe1SBjorn Helgaas segment = 0; 541bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 542f5eebbe1SBjorn Helgaas &segment); 543f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5446dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5456ad95513SBjorn Helgaas result = -ENODEV; 5466ad95513SBjorn Helgaas goto end; 547f5eebbe1SBjorn Helgaas } 5481da177e4SLinus Torvalds 549f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5506ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 551bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 552f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5536ad95513SBjorn Helgaas /* 5546ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5556ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5566ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5576ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5586ad95513SBjorn Helgaas */ 5596ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5606dc7d22cSJiang Liu dev_warn(&device->dev, 5616dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 562bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 563e545b55aSJon Mason NULL, &bus); 5646ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5656ad95513SBjorn Helgaas root->secondary.start = bus; 5666ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5676ad95513SBjorn Helgaas root->secondary.start = 0; 5686ad95513SBjorn Helgaas else { 5696dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5706ad95513SBjorn Helgaas result = -ENODEV; 5716ad95513SBjorn Helgaas goto end; 572f5eebbe1SBjorn Helgaas } 573f5eebbe1SBjorn Helgaas } 5741da177e4SLinus Torvalds 57532917e5bSPatrick Mochel root->device = device; 5760705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5771da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5781da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 579db89b4f0SPavel Machek device->driver_data = root; 5801da177e4SLinus Torvalds 581864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 582864b94adSJiang Liu result = -ENXIO; 583864b94adSJiang Liu goto end; 584864b94adSJiang Liu } 585864b94adSJiang Liu 586ccde83e3SHanjun Guo pr_info("%s [%s] (domain %04x %pR)\n", 587d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 588d4761ba2SBjorn Helgaas root->segment, &root->secondary); 589d4761ba2SBjorn Helgaas 590bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 591f4b57a3bSJiang Liu 592c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 593c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 594415e12b2SRafael J. Wysocki 5953dc48af3SNeil Horman /* 5963dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5973dc48af3SNeil Horman */ 5983dc48af3SNeil Horman 5993dc48af3SNeil Horman /* 6003dc48af3SNeil Horman * Scan the Root Bridge 6013dc48af3SNeil Horman * -------------------- 6023dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 6033dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 6043dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 6053dc48af3SNeil Horman */ 6063dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 6073dc48af3SNeil Horman if (!root->bus) { 6083dc48af3SNeil Horman dev_err(&device->dev, 6093dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6103dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 611f516bde5SRafael J. Wysocki device->driver_data = NULL; 6123dc48af3SNeil Horman result = -ENODEV; 613864b94adSJiang Liu goto remove_dmar; 6143dc48af3SNeil Horman } 6153dc48af3SNeil Horman 6163dc48af3SNeil Horman if (no_aspm) 6173dc48af3SNeil Horman pcie_no_aspm(); 6183dc48af3SNeil Horman 619c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 620de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 621b67ea761SRafael J. Wysocki 622864b94adSJiang Liu if (hotadd) { 6233c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 62439772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 625584c5c42SRui Wang /* 626584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 627584c5c42SRui Wang * case, we need to wait until after PCI initialization in 628584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 629584c5c42SRui Wang * 630584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 631584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 632584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 633584c5c42SRui Wang * (see drivers/acpi/Kconfig). 634584c5c42SRui Wang */ 635fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 636516ca223SJiang Liu } 63762a08c5aSYinghai Lu 6387a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 639c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6407a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 64100c43b96SRafael J. Wysocki return 1; 64247525cdaSRafael J. Wysocki 643864b94adSJiang Liu remove_dmar: 644864b94adSJiang Liu if (hotadd) 645864b94adSJiang Liu dmar_device_remove(handle); 64647525cdaSRafael J. Wysocki end: 64747525cdaSRafael J. Wysocki kfree(root); 64847525cdaSRafael J. Wysocki return result; 649c431ada4SRajesh Shah } 6501da177e4SLinus Torvalds 65100c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6521da177e4SLinus Torvalds { 653caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 654c8e9afb1SJiang Liu 6557a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6567a3bb55eSRafael J. Wysocki 6579738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6589738a1fdSYinghai Lu 659f2ae5da7SRui Wang pci_ioapic_remove(root); 660de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 661b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 662b67ea761SRafael J. Wysocki 6639738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 664f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6659738a1fdSYinghai Lu 666864b94adSJiang Liu dmar_device_remove(device->handle); 667864b94adSJiang Liu 6687a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6697a3bb55eSRafael J. Wysocki 6701da177e4SLinus Torvalds kfree(root); 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6732c204383SJiang Liu /* 6742c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6752c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6762c204383SJiang Liu * and ARM64. 6772c204383SJiang Liu */ 6782c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6792c204383SJiang Liu struct list_head *resources, 6802c204383SJiang Liu unsigned long type) 6812c204383SJiang Liu { 6822c204383SJiang Liu LIST_HEAD(list); 6832c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6842c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6852c204383SJiang Liu 6862c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6872c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6882c204383SJiang Liu 6892c204383SJiang Liu list_splice_init(resources, &list); 6902c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6912c204383SJiang Liu bool free = false; 6922c204383SJiang Liu resource_size_t end; 6932c204383SJiang Liu 6942c204383SJiang Liu res1 = entry->res; 6952c204383SJiang Liu if (!(res1->flags & type)) 6962c204383SJiang Liu goto next; 6972c204383SJiang Liu 6982c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 6992c204383SJiang Liu end = min(res1->end, root->end); 7002c204383SJiang Liu if (end <= res1->start) { 7012c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 7022c204383SJiang Liu res1); 7032c204383SJiang Liu free = true; 7042c204383SJiang Liu goto next; 7052c204383SJiang Liu } else if (res1->end != end) { 7062c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 7072c204383SJiang Liu res1, (unsigned long long)end + 1, 7082c204383SJiang Liu (unsigned long long)res1->end); 7092c204383SJiang Liu res1->end = end; 7102c204383SJiang Liu } 7112c204383SJiang Liu 7122c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7132c204383SJiang Liu res2 = entry2->res; 7142c204383SJiang Liu if (!(res2->flags & type)) 7152c204383SJiang Liu continue; 7162c204383SJiang Liu 7172c204383SJiang Liu /* 7182c204383SJiang Liu * I don't like throwing away windows because then 7192c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7202c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7212c204383SJiang Liu */ 72207aec68eSAndy Shevchenko if (resource_union(res1, res2, res2)) { 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; 884a78cf965SBenjamin Herrenschmidt union acpi_object *obj; 8852c204383SJiang Liu 8862c204383SJiang Liu info->root = root; 8872c204383SJiang Liu info->bridge = device; 8882c204383SJiang Liu info->ops = ops; 8892c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8902c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8912c204383SJiang Liu root->segment, busnum); 8922c204383SJiang Liu 8932c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 8942c204383SJiang Liu goto out_release_info; 8952c204383SJiang Liu if (ops->prepare_resources) 8962c204383SJiang Liu ret = ops->prepare_resources(info); 8972c204383SJiang Liu else 8982c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 8992c204383SJiang Liu if (ret < 0) 9002c204383SJiang Liu goto out_release_info; 9012c204383SJiang Liu 9022c204383SJiang Liu pci_acpi_root_add_resources(info); 9032c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 9042c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 9052c204383SJiang Liu sysdata, &info->resources); 9062c204383SJiang Liu if (!bus) 9072c204383SJiang Liu goto out_release_info; 9082c204383SJiang Liu 90902bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 91002bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9119310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9121df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9131df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 91402bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 91502bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 91602bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 91702bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 918af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 919af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 920ac1c8e35SKuppuswamy Sathyanarayanan if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) 921ac1c8e35SKuppuswamy Sathyanarayanan host_bridge->native_dpc = 0; 92202bfeb48SBjorn Helgaas 923a78cf965SBenjamin Herrenschmidt /* 924a78cf965SBenjamin Herrenschmidt * Evaluate the "PCI Boot Configuration" _DSM Function. If it 925a78cf965SBenjamin Herrenschmidt * exists and returns 0, we must preserve any PCI resource 926a78cf965SBenjamin Herrenschmidt * assignments made by firmware for this host bridge. 927a78cf965SBenjamin Herrenschmidt */ 928a78cf965SBenjamin Herrenschmidt obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, 9293910ebacSKrzysztof Wilczyński DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); 930a78cf965SBenjamin Herrenschmidt if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) 931a78cf965SBenjamin Herrenschmidt host_bridge->preserve_config = 1; 932a78cf965SBenjamin Herrenschmidt ACPI_FREE(obj); 933a78cf965SBenjamin Herrenschmidt 9342c204383SJiang Liu pci_scan_child_bus(bus); 93502bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 93602bfeb48SBjorn Helgaas info); 9372c204383SJiang Liu if (node != NUMA_NO_NODE) 9382c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9392c204383SJiang Liu return bus; 9402c204383SJiang Liu 9412c204383SJiang Liu out_release_info: 9422c204383SJiang Liu __acpi_pci_root_release_info(info); 9432c204383SJiang Liu return NULL; 9442c204383SJiang Liu } 9452c204383SJiang Liu 94600c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9471da177e4SLinus Torvalds { 948d3072e6aSRafael J. Wysocki acpi_hest_init(); 9493338db00SRafael J. Wysocki if (acpi_pci_disabled) 9503338db00SRafael J. Wysocki return; 951d3072e6aSRafael J. Wysocki 9527bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9533338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 954668192b6SYinghai Lu } 955