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> 25ace8238bSRafael J. Wysocki #include "internal.h" 26ace8238bSRafael J. Wysocki 271da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 281da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 2900c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 3000c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 3100c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 321da177e4SLinus Torvalds 333338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 343338db00SRafael J. Wysocki { 351f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 363338db00SRafael J. Wysocki return 0; 373338db00SRafael J. Wysocki } 383338db00SRafael J. Wysocki 397dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 407dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 417dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 427dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 43415e12b2SRafael J. Wysocki 44c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 451ba90e3aSThomas Renninger {"PNP0A03", 0}, 461ba90e3aSThomas Renninger {"", 0}, 471ba90e3aSThomas Renninger }; 481ba90e3aSThomas Renninger 4900c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 501ba90e3aSThomas Renninger .ids = root_device_ids, 5100c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 5200c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 53ca499fc8SToshi Kani .hotplug = { 543338db00SRafael J. Wysocki .enabled = true, 553338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 56ca499fc8SToshi Kani }, 571da177e4SLinus Torvalds }; 581da177e4SLinus Torvalds 5927558203SAlexander Chiang /** 6027558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 618e8883ceSTian Tao * @handle: the ACPI CA node in question. 6227558203SAlexander Chiang * 6327558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 6427558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 6527558203SAlexander Chiang */ 6627558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 6727558203SAlexander Chiang { 6899ece713SRafael J. Wysocki struct acpi_device *device = acpi_fetch_acpi_dev(handle); 6927558203SAlexander Chiang int ret; 7027558203SAlexander Chiang 7199ece713SRafael J. Wysocki if (!device) 7227558203SAlexander Chiang return 0; 7327558203SAlexander Chiang 7427558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 7527558203SAlexander Chiang if (ret) 7627558203SAlexander Chiang return 0; 7727558203SAlexander Chiang else 7827558203SAlexander Chiang return 1; 7927558203SAlexander Chiang } 8027558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 8127558203SAlexander Chiang 821da177e4SLinus Torvalds static acpi_status 831da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 841da177e4SLinus Torvalds { 856ad95513SBjorn Helgaas struct resource *res = data; 861da177e4SLinus Torvalds struct acpi_resource_address64 address; 87f6c1c8ffSBjorn Helgaas acpi_status status; 881da177e4SLinus Torvalds 89f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 90f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 911da177e4SLinus Torvalds return AE_OK; 921da177e4SLinus Torvalds 93a45de93eSLv Zheng if ((address.address.address_length > 0) && 946ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 95a45de93eSLv Zheng res->start = address.address.minimum; 96a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 976ad95513SBjorn Helgaas } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds return AE_OK; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 102f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1036ad95513SBjorn Helgaas struct resource *res) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds acpi_status status; 1061da177e4SLinus Torvalds 1076ad95513SBjorn Helgaas res->start = -1; 1084be44fcdSLen Brown status = 1094be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1106ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1111da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1121da177e4SLinus Torvalds return status; 1136ad95513SBjorn Helgaas if (res->start == -1) 1141da177e4SLinus Torvalds return AE_ERROR; 1151da177e4SLinus Torvalds return AE_OK; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 118955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 119955f14b4SBjorn Helgaas u32 bit; 120955f14b4SBjorn Helgaas char *desc; 121955f14b4SBjorn Helgaas }; 122955f14b4SBjorn Helgaas 123955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 124955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 125955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 126955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 127955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 128955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 129ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EDR_SUPPORT, "EDR" }, 130ba11edc6SAlexandru Gagniuc { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" }, 131955f14b4SBjorn Helgaas }; 132955f14b4SBjorn Helgaas 133955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 134955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 135955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 136955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 137955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 138955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 139af8bb9f8SBjorn Helgaas { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, 140ac1c8e35SKuppuswamy Sathyanarayanan { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, 141955f14b4SBjorn Helgaas }; 142955f14b4SBjorn Helgaas 143955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 144955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 145955f14b4SBjorn Helgaas { 146955f14b4SBjorn Helgaas char buf[80]; 147955f14b4SBjorn Helgaas int i, len = 0; 148955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 149955f14b4SBjorn Helgaas 150955f14b4SBjorn Helgaas buf[0] = '\0'; 151955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 152955f14b4SBjorn Helgaas if (word & entry->bit) 153edd66086STakashi Iwai len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", 154955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 155955f14b4SBjorn Helgaas 156955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 157955f14b4SBjorn Helgaas } 158955f14b4SBjorn Helgaas 159955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 160955f14b4SBjorn Helgaas { 161955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 162955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 163955f14b4SBjorn Helgaas } 164955f14b4SBjorn Helgaas 165955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 166955f14b4SBjorn Helgaas { 167955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 168955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 169955f14b4SBjorn Helgaas } 170955f14b4SBjorn Helgaas 1713a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 17263f10f0fSKenji Kaneshige 17363f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 17463f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 17563f10f0fSKenji Kaneshige { 1763a9622dcSShaohua Li struct acpi_osc_context context = { 1773a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1783a9622dcSShaohua Li .rev = 1, 1793a9622dcSShaohua Li .cap.length = 12, 1803a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1813a9622dcSShaohua Li }; 18263f10f0fSKenji Kaneshige acpi_status status; 18363f10f0fSKenji Kaneshige 1843a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1853a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 1863a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 1873a9622dcSShaohua Li kfree(context.ret.pointer); 18863f10f0fSKenji Kaneshige } 18963f10f0fSKenji Kaneshige return status; 19063f10f0fSKenji Kaneshige } 19163f10f0fSKenji Kaneshige 192ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 193ab8e8957SRafael J. Wysocki u32 support, 194ab8e8957SRafael J. Wysocki u32 *control) 19563f10f0fSKenji Kaneshige { 19663f10f0fSKenji Kaneshige acpi_status status; 197ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 19863f10f0fSKenji Kaneshige 199ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 200ab8e8957SRafael J. Wysocki 201b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 202b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 203b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 20463f10f0fSKenji Kaneshige 20563f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 20663f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 207ab8e8957SRafael J. Wysocki root->osc_support_set = support; 208ab8e8957SRafael J. Wysocki *control = result; 209ab8e8957SRafael J. Wysocki } 21063f10f0fSKenji Kaneshige return status; 21163f10f0fSKenji Kaneshige } 21263f10f0fSKenji Kaneshige 21376d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 21463f10f0fSKenji Kaneshige { 21599ece713SRafael J. Wysocki struct acpi_device *device = acpi_fetch_acpi_dev(handle); 21663f10f0fSKenji Kaneshige struct acpi_pci_root *root; 217c1aec834SBjorn Helgaas 21899ece713SRafael J. Wysocki if (!device || acpi_match_device_ids(device, root_device_ids)) 21963f10f0fSKenji Kaneshige return NULL; 220cd4faf9cSTaku Izumi 221cd4faf9cSTaku Izumi root = acpi_driver_data(device); 222cd4faf9cSTaku Izumi 223cd4faf9cSTaku Izumi return root; 22463f10f0fSKenji Kaneshige } 22576d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 22663f10f0fSKenji Kaneshige 2272f7bbcebSAlexander Chiang struct acpi_handle_node { 2282f7bbcebSAlexander Chiang struct list_head node; 2292f7bbcebSAlexander Chiang acpi_handle handle; 2302f7bbcebSAlexander Chiang }; 2312f7bbcebSAlexander Chiang 2322f7bbcebSAlexander Chiang /** 2332f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2342f7bbcebSAlexander Chiang * @handle: the handle in question 2352f7bbcebSAlexander Chiang * 2362f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2372f7bbcebSAlexander Chiang * list of PCI devices. 2382f7bbcebSAlexander Chiang * 2392f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2402f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2412f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2422f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2432f7bbcebSAlexander Chiang */ 2442f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2452f7bbcebSAlexander Chiang { 2462f7bbcebSAlexander Chiang int dev, fn; 2472f7bbcebSAlexander Chiang unsigned long long adr; 2482f7bbcebSAlexander Chiang acpi_status status; 2492f7bbcebSAlexander Chiang acpi_handle phandle; 2502f7bbcebSAlexander Chiang struct pci_bus *pbus; 2512f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2522f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2532f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2542f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2552f7bbcebSAlexander Chiang 2562f7bbcebSAlexander Chiang /* 2572f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2582f7bbcebSAlexander Chiang */ 2592f7bbcebSAlexander Chiang phandle = handle; 2602f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2612f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2622f7bbcebSAlexander Chiang if (!node) 2632f7bbcebSAlexander Chiang goto out; 2642f7bbcebSAlexander Chiang 2652f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2662f7bbcebSAlexander Chiang node->handle = phandle; 2672f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 2682f7bbcebSAlexander Chiang 2692f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 2702f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2712f7bbcebSAlexander Chiang goto out; 2722f7bbcebSAlexander Chiang } 2732f7bbcebSAlexander Chiang 2742f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 2752f7bbcebSAlexander Chiang if (!root) 2762f7bbcebSAlexander Chiang goto out; 2772f7bbcebSAlexander Chiang 2782f7bbcebSAlexander Chiang pbus = root->bus; 2792f7bbcebSAlexander Chiang 2802f7bbcebSAlexander Chiang /* 2812f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 2822f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 2832f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 2842f7bbcebSAlexander Chiang */ 2852f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 2862f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 2872f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 2882f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 2892f7bbcebSAlexander Chiang goto out; 2902f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 2912f7bbcebSAlexander Chiang fn = adr & 0xffff; 2922f7bbcebSAlexander Chiang 2932f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 294412af978STroy Moure if (!pdev || hnd == handle) 2952f7bbcebSAlexander Chiang break; 2962f7bbcebSAlexander Chiang 2972f7bbcebSAlexander Chiang pbus = pdev->subordinate; 2982f7bbcebSAlexander Chiang pci_dev_put(pdev); 299497fb54fSRafael J. Wysocki 300497fb54fSRafael J. Wysocki /* 301497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 302497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 303497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 304497fb54fSRafael J. Wysocki */ 305497fb54fSRafael J. Wysocki if (!pbus) { 306497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 307497fb54fSRafael J. Wysocki pdev = NULL; 308497fb54fSRafael J. Wysocki break; 309497fb54fSRafael J. Wysocki } 3102f7bbcebSAlexander Chiang } 3112f7bbcebSAlexander Chiang out: 3122f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3132f7bbcebSAlexander Chiang kfree(node); 3142f7bbcebSAlexander Chiang 3152f7bbcebSAlexander Chiang return pdev; 3162f7bbcebSAlexander Chiang } 3172f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3182f7bbcebSAlexander Chiang 31963f10f0fSKenji Kaneshige /** 32075fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 32175fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 32275fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 323843438deSYang Li * @support: _OSC supported capability. 32463f10f0fSKenji Kaneshige * 32575fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 32675fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 32775fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 32875fb60f2SRafael J. Wysocki * 32975fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 33075fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 33175fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 33275fb60f2SRafael J. Wysocki * on failure. 33363f10f0fSKenji Kaneshige **/ 3346bc779eeSJoerg Roedel static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 support) 33563f10f0fSKenji Kaneshige { 3366bc779eeSJoerg Roedel u32 req = OSC_PCI_EXPRESS_CAPABILITY_CONTROL; 33763f10f0fSKenji Kaneshige struct acpi_pci_root *root; 338866e61fcSBjorn Helgaas acpi_status status; 33975fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 34063f10f0fSKenji Kaneshige 34175fb60f2SRafael J. Wysocki if (!mask) 34275fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 34375fb60f2SRafael J. Wysocki 34463f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 34563f10f0fSKenji Kaneshige if (!root) 34663f10f0fSKenji Kaneshige return AE_NOT_EXIST; 34763f10f0fSKenji Kaneshige 3486bc779eeSJoerg Roedel ctrl = *mask; 3496bc779eeSJoerg Roedel *mask |= root->osc_control_set; 35063f10f0fSKenji Kaneshige 35175fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 3526bc779eeSJoerg Roedel do { 3536bc779eeSJoerg Roedel status = acpi_pci_query_osc(root, support, mask); 35463f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 355866e61fcSBjorn Helgaas return status; 35675fb60f2SRafael J. Wysocki if (ctrl == *mask) 35775fb60f2SRafael J. Wysocki break; 358955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 359955f14b4SBjorn Helgaas ctrl & ~(*mask)); 36075fb60f2SRafael J. Wysocki ctrl = *mask; 3616bc779eeSJoerg Roedel } while (*mask); 3626bc779eeSJoerg Roedel 3636bc779eeSJoerg Roedel /* No need to request _OSC if the control was already granted. */ 3646bc779eeSJoerg Roedel if ((root->osc_control_set & ctrl) == ctrl) 3656bc779eeSJoerg Roedel return AE_OK; 3662b8fd918SRafael J. Wysocki 36775fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 368955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 369955f14b4SBjorn Helgaas req & ~(ctrl)); 370866e61fcSBjorn Helgaas return AE_SUPPORT; 37163f10f0fSKenji Kaneshige } 37263f10f0fSKenji Kaneshige 373b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 374b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 375b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 37675fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 377866e61fcSBjorn Helgaas if (ACPI_FAILURE(status)) 37863f10f0fSKenji Kaneshige return status; 379866e61fcSBjorn Helgaas 380866e61fcSBjorn Helgaas root->osc_control_set = *mask; 381866e61fcSBjorn Helgaas return AE_OK; 38263f10f0fSKenji Kaneshige } 38363f10f0fSKenji Kaneshige 3844c6f6060SJoerg Roedel static u32 calculate_support(void) 3854c6f6060SJoerg Roedel { 3864c6f6060SJoerg Roedel u32 support; 3874c6f6060SJoerg Roedel 3884c6f6060SJoerg Roedel /* 3894c6f6060SJoerg Roedel * All supported architectures that use ACPI have support for 3904c6f6060SJoerg Roedel * PCI domains, so we indicate this in _OSC support capabilities. 3914c6f6060SJoerg Roedel */ 3924c6f6060SJoerg Roedel support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 3934c6f6060SJoerg Roedel support |= OSC_PCI_HPX_TYPE_3_SUPPORT; 3944c6f6060SJoerg Roedel if (pci_ext_cfg_avail()) 3954c6f6060SJoerg Roedel support |= OSC_PCI_EXT_CONFIG_SUPPORT; 3964c6f6060SJoerg Roedel if (pcie_aspm_support_enabled()) 3974c6f6060SJoerg Roedel support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 3984c6f6060SJoerg Roedel if (pci_msi_enabled()) 3994c6f6060SJoerg Roedel support |= OSC_PCI_MSI_SUPPORT; 4004c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_EDR)) 4014c6f6060SJoerg Roedel support |= OSC_PCI_EDR_SUPPORT; 4024c6f6060SJoerg Roedel 4034c6f6060SJoerg Roedel return support; 4044c6f6060SJoerg Roedel } 4054c6f6060SJoerg Roedel 4064c6f6060SJoerg Roedel static u32 calculate_control(void) 4074c6f6060SJoerg Roedel { 4084c6f6060SJoerg Roedel u32 control; 4094c6f6060SJoerg Roedel 4104c6f6060SJoerg Roedel control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4114c6f6060SJoerg Roedel | OSC_PCI_EXPRESS_PME_CONTROL; 4124c6f6060SJoerg Roedel 4134c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIEASPM)) 4144c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_LTR_CONTROL; 4154c6f6060SJoerg Roedel 4164c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)) 4174c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; 4184c6f6060SJoerg Roedel 4194c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC)) 4204c6f6060SJoerg Roedel control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL; 4214c6f6060SJoerg Roedel 4224c6f6060SJoerg Roedel if (pci_aer_available()) 4234c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_AER_CONTROL; 4244c6f6060SJoerg Roedel 4254c6f6060SJoerg Roedel /* 4264c6f6060SJoerg Roedel * Per the Downstream Port Containment Related Enhancements ECN to 4274c6f6060SJoerg Roedel * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, 4284c6f6060SJoerg Roedel * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC 4294c6f6060SJoerg Roedel * and EDR. 4304c6f6060SJoerg Roedel */ 4314c6f6060SJoerg Roedel if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR)) 4324c6f6060SJoerg Roedel control |= OSC_PCI_EXPRESS_DPC_CONTROL; 4334c6f6060SJoerg Roedel 4344c6f6060SJoerg Roedel return control; 4354c6f6060SJoerg Roedel } 4364c6f6060SJoerg Roedel 43787f1f87aSJoerg Roedel static bool os_control_query_checks(struct acpi_pci_root *root, u32 support) 43887f1f87aSJoerg Roedel { 43987f1f87aSJoerg Roedel struct acpi_device *device = root->device; 44087f1f87aSJoerg Roedel 44187f1f87aSJoerg Roedel if (pcie_ports_disabled) { 44287f1f87aSJoerg Roedel dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 44387f1f87aSJoerg Roedel return false; 44487f1f87aSJoerg Roedel } 44587f1f87aSJoerg Roedel 44687f1f87aSJoerg Roedel if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 44787f1f87aSJoerg Roedel decode_osc_support(root, "not requesting OS control; OS requires", 44887f1f87aSJoerg Roedel ACPI_PCIE_REQ_SUPPORT); 44987f1f87aSJoerg Roedel return false; 45087f1f87aSJoerg Roedel } 45187f1f87aSJoerg Roedel 45287f1f87aSJoerg Roedel return true; 45387f1f87aSJoerg Roedel } 45487f1f87aSJoerg Roedel 455c238252fSSinan Kaya static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 456c238252fSSinan Kaya bool is_pcie) 4573e43abb0SBjorn Helgaas { 4586bc779eeSJoerg Roedel u32 support, control = 0, requested = 0; 4593e43abb0SBjorn Helgaas acpi_status status; 4603e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4613e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4623e43abb0SBjorn Helgaas 4633e43abb0SBjorn Helgaas /* 4647bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4657bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4667bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4677bc5a2baSMatthew Garrett */ 468630b3affSLukas Wunner if (x86_apple_machine) { 4697bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4707bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4717bc5a2baSMatthew Garrett root->osc_control_set); 4727bc5a2baSMatthew Garrett return; 4737bc5a2baSMatthew Garrett } 4747bc5a2baSMatthew Garrett 4754c6f6060SJoerg Roedel support = calculate_support(); 476955f14b4SBjorn Helgaas 477955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 478c238252fSSinan Kaya 4796bc779eeSJoerg Roedel if (os_control_query_checks(root, support)) 4804c6f6060SJoerg Roedel requested = control = calculate_control(); 4813e43abb0SBjorn Helgaas 4826bc779eeSJoerg Roedel status = acpi_pci_osc_control_set(handle, &control, support); 4833e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 4846bc779eeSJoerg Roedel if (control) 485955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 4866bc779eeSJoerg Roedel 4873e43abb0SBjorn Helgaas if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { 4883e43abb0SBjorn Helgaas /* 489387d3757SMatthew Garrett * We have ASPM control, but the FADT indicates that 490387d3757SMatthew Garrett * it's unsupported. Leave existing configuration 491387d3757SMatthew Garrett * intact and prevent the OS from touching it. 4923e43abb0SBjorn Helgaas */ 493387d3757SMatthew Garrett dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); 494387d3757SMatthew Garrett *no_aspm = 1; 4953e43abb0SBjorn Helgaas } 4963e43abb0SBjorn Helgaas } else { 4973e43abb0SBjorn Helgaas /* 4983e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 4993e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5003e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5013e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5023e43abb0SBjorn Helgaas * root scan. 5033e43abb0SBjorn Helgaas */ 5043e43abb0SBjorn Helgaas *no_aspm = 1; 5056bc779eeSJoerg Roedel 5066bc779eeSJoerg Roedel /* _OSC is optional for PCI host bridges */ 5076bc779eeSJoerg Roedel if ((status == AE_NOT_FOUND) && !is_pcie) 5086bc779eeSJoerg Roedel return; 5096bc779eeSJoerg Roedel 5106bc779eeSJoerg Roedel if (control) { 5116bc779eeSJoerg Roedel decode_osc_control(root, "OS requested", requested); 5126bc779eeSJoerg Roedel decode_osc_control(root, "platform willing to grant", control); 5136bc779eeSJoerg Roedel } 5146bc779eeSJoerg Roedel 5156bc779eeSJoerg Roedel dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", 5166bc779eeSJoerg Roedel acpi_format_exception(status)); 5173e43abb0SBjorn Helgaas } 5183e43abb0SBjorn Helgaas } 5193e43abb0SBjorn Helgaas 52000c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 52100c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5221da177e4SLinus Torvalds { 523f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 524f5eebbe1SBjorn Helgaas acpi_status status; 525f5eebbe1SBjorn Helgaas int result; 526f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 527bfe2414aSJiang Liu acpi_handle handle = device->handle; 528387d3757SMatthew Garrett int no_aspm = 0; 5299762b33dSThomas Gleixner bool hotadd = system_state == SYSTEM_RUNNING; 530c238252fSSinan Kaya bool is_pcie; 5311da177e4SLinus Torvalds 5326ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5336ad95513SBjorn Helgaas if (!root) 5346ad95513SBjorn Helgaas return -ENOMEM; 5356ad95513SBjorn Helgaas 536f5eebbe1SBjorn Helgaas segment = 0; 537bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 538f5eebbe1SBjorn Helgaas &segment); 539f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5406dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5416ad95513SBjorn Helgaas result = -ENODEV; 5426ad95513SBjorn Helgaas goto end; 543f5eebbe1SBjorn Helgaas } 5441da177e4SLinus Torvalds 545f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5466ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 547bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 548f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5496ad95513SBjorn Helgaas /* 5506ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5516ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5526ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5536ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5546ad95513SBjorn Helgaas */ 5556ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5566dc7d22cSJiang Liu dev_warn(&device->dev, 5576dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 558bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 559e545b55aSJon Mason NULL, &bus); 5606ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5616ad95513SBjorn Helgaas root->secondary.start = bus; 5626ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5636ad95513SBjorn Helgaas root->secondary.start = 0; 5646ad95513SBjorn Helgaas else { 5656dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5666ad95513SBjorn Helgaas result = -ENODEV; 5676ad95513SBjorn Helgaas goto end; 568f5eebbe1SBjorn Helgaas } 569f5eebbe1SBjorn Helgaas } 5701da177e4SLinus Torvalds 57132917e5bSPatrick Mochel root->device = device; 5720705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5731da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5741da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 575db89b4f0SPavel Machek device->driver_data = root; 5761da177e4SLinus Torvalds 577864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 578864b94adSJiang Liu result = -ENXIO; 579864b94adSJiang Liu goto end; 580864b94adSJiang Liu } 581864b94adSJiang Liu 582ccde83e3SHanjun Guo pr_info("%s [%s] (domain %04x %pR)\n", 583d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 584d4761ba2SBjorn Helgaas root->segment, &root->secondary); 585d4761ba2SBjorn Helgaas 586bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 587f4b57a3bSJiang Liu 588c238252fSSinan Kaya is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0; 589c238252fSSinan Kaya negotiate_os_control(root, &no_aspm, is_pcie); 590415e12b2SRafael J. Wysocki 5913dc48af3SNeil Horman /* 5923dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5933dc48af3SNeil Horman */ 5943dc48af3SNeil Horman 5953dc48af3SNeil Horman /* 5963dc48af3SNeil Horman * Scan the Root Bridge 5973dc48af3SNeil Horman * -------------------- 5983dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 5993dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 6003dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 6013dc48af3SNeil Horman */ 6023dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 6033dc48af3SNeil Horman if (!root->bus) { 6043dc48af3SNeil Horman dev_err(&device->dev, 6053dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6063dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 607f516bde5SRafael J. Wysocki device->driver_data = NULL; 6083dc48af3SNeil Horman result = -ENODEV; 609864b94adSJiang Liu goto remove_dmar; 6103dc48af3SNeil Horman } 6113dc48af3SNeil Horman 6123dc48af3SNeil Horman if (no_aspm) 6133dc48af3SNeil Horman pcie_no_aspm(); 6143dc48af3SNeil Horman 615c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 616de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); 617b67ea761SRafael J. Wysocki 618864b94adSJiang Liu if (hotadd) { 6193c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 62039772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 621584c5c42SRui Wang /* 622584c5c42SRui Wang * This is only called for the hotadd case. For the boot-time 623584c5c42SRui Wang * case, we need to wait until after PCI initialization in 624584c5c42SRui Wang * order to deal with IOAPICs mapped in on a PCI BAR. 625584c5c42SRui Wang * 626584c5c42SRui Wang * This is currently x86-specific, because acpi_ioapic_add() 627584c5c42SRui Wang * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. 628584c5c42SRui Wang * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC 629584c5c42SRui Wang * (see drivers/acpi/Kconfig). 630584c5c42SRui Wang */ 631fe7bd58fSRui Wang acpi_ioapic_add(root->device->handle); 632516ca223SJiang Liu } 63362a08c5aSYinghai Lu 6347a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 635c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6367a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 63700c43b96SRafael J. Wysocki return 1; 63847525cdaSRafael J. Wysocki 639864b94adSJiang Liu remove_dmar: 640864b94adSJiang Liu if (hotadd) 641864b94adSJiang Liu dmar_device_remove(handle); 64247525cdaSRafael J. Wysocki end: 64347525cdaSRafael J. Wysocki kfree(root); 64447525cdaSRafael J. Wysocki return result; 645c431ada4SRajesh Shah } 6461da177e4SLinus Torvalds 64700c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6481da177e4SLinus Torvalds { 649caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 650c8e9afb1SJiang Liu 6517a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6527a3bb55eSRafael J. Wysocki 6539738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6549738a1fdSYinghai Lu 655f2ae5da7SRui Wang pci_ioapic_remove(root); 656de3ef1ebSRafael J. Wysocki device_set_wakeup_capable(root->bus->bridge, false); 657b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 658b67ea761SRafael J. Wysocki 6599738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 660f2ae5da7SRui Wang WARN_ON(acpi_ioapic_remove(root)); 6619738a1fdSYinghai Lu 662864b94adSJiang Liu dmar_device_remove(device->handle); 663864b94adSJiang Liu 6647a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6657a3bb55eSRafael J. Wysocki 6661da177e4SLinus Torvalds kfree(root); 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6692c204383SJiang Liu /* 6702c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6712c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6722c204383SJiang Liu * and ARM64. 6732c204383SJiang Liu */ 6742c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6752c204383SJiang Liu struct list_head *resources, 6762c204383SJiang Liu unsigned long type) 6772c204383SJiang Liu { 6782c204383SJiang Liu LIST_HEAD(list); 6792c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6802c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6812c204383SJiang Liu 6822c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6832c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6842c204383SJiang Liu 6852c204383SJiang Liu list_splice_init(resources, &list); 6862c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6872c204383SJiang Liu bool free = false; 6882c204383SJiang Liu resource_size_t end; 6892c204383SJiang Liu 6902c204383SJiang Liu res1 = entry->res; 6912c204383SJiang Liu if (!(res1->flags & type)) 6922c204383SJiang Liu goto next; 6932c204383SJiang Liu 6942c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 6952c204383SJiang Liu end = min(res1->end, root->end); 6962c204383SJiang Liu if (end <= res1->start) { 6972c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 6982c204383SJiang Liu res1); 6992c204383SJiang Liu free = true; 7002c204383SJiang Liu goto next; 7012c204383SJiang Liu } else if (res1->end != end) { 7022c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 7032c204383SJiang Liu res1, (unsigned long long)end + 1, 7042c204383SJiang Liu (unsigned long long)res1->end); 7052c204383SJiang Liu res1->end = end; 7062c204383SJiang Liu } 7072c204383SJiang Liu 7082c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 7092c204383SJiang Liu res2 = entry2->res; 7102c204383SJiang Liu if (!(res2->flags & type)) 7112c204383SJiang Liu continue; 7122c204383SJiang Liu 7132c204383SJiang Liu /* 7142c204383SJiang Liu * I don't like throwing away windows because then 7152c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7162c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7172c204383SJiang Liu */ 71807aec68eSAndy Shevchenko if (resource_union(res1, res2, res2)) { 7192c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7202c204383SJiang Liu res2, res1); 7212c204383SJiang Liu free = true; 7222c204383SJiang Liu goto next; 7232c204383SJiang Liu } 7242c204383SJiang Liu } 7252c204383SJiang Liu 7262c204383SJiang Liu next: 7272c204383SJiang Liu resource_list_del(entry); 7282c204383SJiang Liu if (free) 7292c204383SJiang Liu resource_list_free_entry(entry); 7302c204383SJiang Liu else 7312c204383SJiang Liu resource_list_add_tail(entry, resources); 7322c204383SJiang Liu } 7332c204383SJiang Liu } 7342c204383SJiang Liu 735fcfaab30SGabriele Paoloni static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode, 736fcfaab30SGabriele Paoloni struct resource_entry *entry) 7370a70abb3SJayachandran C { 7380a70abb3SJayachandran C #ifdef PCI_IOBASE 7390a70abb3SJayachandran C struct resource *res = entry->res; 7400a70abb3SJayachandran C resource_size_t cpu_addr = res->start; 7410a70abb3SJayachandran C resource_size_t pci_addr = cpu_addr - entry->offset; 7420a70abb3SJayachandran C resource_size_t length = resource_size(res); 7430a70abb3SJayachandran C unsigned long port; 7440a70abb3SJayachandran C 745fcfaab30SGabriele Paoloni if (pci_register_io_range(fwnode, cpu_addr, length)) 7460a70abb3SJayachandran C goto err; 7470a70abb3SJayachandran C 7480a70abb3SJayachandran C port = pci_address_to_pio(cpu_addr); 7490a70abb3SJayachandran C if (port == (unsigned long)-1) 7500a70abb3SJayachandran C goto err; 7510a70abb3SJayachandran C 7520a70abb3SJayachandran C res->start = port; 7530a70abb3SJayachandran C res->end = port + length - 1; 7540a70abb3SJayachandran C entry->offset = port - pci_addr; 7550a70abb3SJayachandran C 7560a70abb3SJayachandran C if (pci_remap_iospace(res, cpu_addr) < 0) 7570a70abb3SJayachandran C goto err; 7580a70abb3SJayachandran C 7590a70abb3SJayachandran C pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); 7600a70abb3SJayachandran C return; 7610a70abb3SJayachandran C err: 7620a70abb3SJayachandran C res->flags |= IORESOURCE_DISABLED; 7630a70abb3SJayachandran C #endif 7640a70abb3SJayachandran C } 7650a70abb3SJayachandran C 7662c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7672c204383SJiang Liu { 7682c204383SJiang Liu int ret; 7692c204383SJiang Liu struct list_head *list = &info->resources; 7702c204383SJiang Liu struct acpi_device *device = info->bridge; 7712c204383SJiang Liu struct resource_entry *entry, *tmp; 7722c204383SJiang Liu unsigned long flags; 7732c204383SJiang Liu 7742c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7752c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7762c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7772c204383SJiang Liu (void *)flags); 7782c204383SJiang Liu if (ret < 0) 7792c204383SJiang Liu dev_warn(&device->dev, 7802c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7812c204383SJiang Liu else if (ret == 0) 7822c204383SJiang Liu dev_dbg(&device->dev, 7832c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 7842c204383SJiang Liu else { 7852c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 7860a70abb3SJayachandran C if (entry->res->flags & IORESOURCE_IO) 787fcfaab30SGabriele Paoloni acpi_pci_root_remap_iospace(&device->fwnode, 788fcfaab30SGabriele Paoloni entry); 7890a70abb3SJayachandran C 7902c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 7912c204383SJiang Liu resource_list_destroy_entry(entry); 7922c204383SJiang Liu else 7932c204383SJiang Liu entry->res->name = info->name; 7942c204383SJiang Liu } 7952c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7962c204383SJiang Liu IORESOURCE_MEM); 7972c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7982c204383SJiang Liu IORESOURCE_IO); 7992c204383SJiang Liu } 8002c204383SJiang Liu 8012c204383SJiang Liu return ret; 8022c204383SJiang Liu } 8032c204383SJiang Liu 8042c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 8052c204383SJiang Liu { 8062c204383SJiang Liu struct resource_entry *entry, *tmp; 8072c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 8082c204383SJiang Liu 8092c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8102c204383SJiang Liu res = entry->res; 8112c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 8122c204383SJiang Liu root = &iomem_resource; 8132c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 8142c204383SJiang Liu root = &ioport_resource; 8152c204383SJiang Liu else 8162c204383SJiang Liu continue; 8172c204383SJiang Liu 818727ae8beSLiu Jiang /* 819727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 820727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 821727ae8beSLiu Jiang */ 822727ae8beSLiu Jiang if (res == root) 823727ae8beSLiu Jiang continue; 824727ae8beSLiu Jiang 8252c204383SJiang Liu conflict = insert_resource_conflict(root, res); 8262c204383SJiang Liu if (conflict) { 8272c204383SJiang Liu dev_info(&info->bridge->dev, 8282c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 8292c204383SJiang Liu res, conflict->name, conflict); 8302c204383SJiang Liu resource_list_destroy_entry(entry); 8312c204383SJiang Liu } 8322c204383SJiang Liu } 8332c204383SJiang Liu } 8342c204383SJiang Liu 8352c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 8362c204383SJiang Liu { 8372c204383SJiang Liu struct resource *res; 8382c204383SJiang Liu struct resource_entry *entry, *tmp; 8392c204383SJiang Liu 8402c204383SJiang Liu if (!info) 8412c204383SJiang Liu return; 8422c204383SJiang Liu 8432c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 8442c204383SJiang Liu res = entry->res; 8452c204383SJiang Liu if (res->parent && 8462c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8472c204383SJiang Liu release_resource(res); 8482c204383SJiang Liu resource_list_destroy_entry(entry); 8492c204383SJiang Liu } 8502c204383SJiang Liu 8512c204383SJiang Liu info->ops->release_info(info); 8522c204383SJiang Liu } 8532c204383SJiang Liu 8542c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8552c204383SJiang Liu { 8562c204383SJiang Liu struct resource *res; 8572c204383SJiang Liu struct resource_entry *entry; 8582c204383SJiang Liu 8592c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8602c204383SJiang Liu res = entry->res; 8610a70abb3SJayachandran C if (res->flags & IORESOURCE_IO) 8620a70abb3SJayachandran C pci_unmap_iospace(res); 8632c204383SJiang Liu if (res->parent && 8642c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8652c204383SJiang Liu release_resource(res); 8662c204383SJiang Liu } 8672c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8682c204383SJiang Liu } 8692c204383SJiang Liu 8702c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8712c204383SJiang Liu struct acpi_pci_root_ops *ops, 8722c204383SJiang Liu struct acpi_pci_root_info *info, 8732c204383SJiang Liu void *sysdata) 8742c204383SJiang Liu { 8752c204383SJiang Liu int ret, busnum = root->secondary.start; 8762c204383SJiang Liu struct acpi_device *device = root->device; 8772c204383SJiang Liu int node = acpi_get_node(device->handle); 8782c204383SJiang Liu struct pci_bus *bus; 87902bfeb48SBjorn Helgaas struct pci_host_bridge *host_bridge; 880a78cf965SBenjamin Herrenschmidt union acpi_object *obj; 8812c204383SJiang Liu 8822c204383SJiang Liu info->root = root; 8832c204383SJiang Liu info->bridge = device; 8842c204383SJiang Liu info->ops = ops; 8852c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8862c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8872c204383SJiang Liu root->segment, busnum); 8882c204383SJiang Liu 8892c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 8902c204383SJiang Liu goto out_release_info; 8912c204383SJiang Liu if (ops->prepare_resources) 8922c204383SJiang Liu ret = ops->prepare_resources(info); 8932c204383SJiang Liu else 8942c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 8952c204383SJiang Liu if (ret < 0) 8962c204383SJiang Liu goto out_release_info; 8972c204383SJiang Liu 8982c204383SJiang Liu pci_acpi_root_add_resources(info); 8992c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 9002c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 9012c204383SJiang Liu sysdata, &info->resources); 9022c204383SJiang Liu if (!bus) 9032c204383SJiang Liu goto out_release_info; 9042c204383SJiang Liu 90502bfeb48SBjorn Helgaas host_bridge = to_pci_host_bridge(bus->bridge); 90602bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 9079310f0dcSMika Westerberg host_bridge->native_pcie_hotplug = 0; 9081df81a6dSMika Westerberg if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) 9091df81a6dSMika Westerberg host_bridge->native_shpc_hotplug = 0; 91002bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) 91102bfeb48SBjorn Helgaas host_bridge->native_aer = 0; 91202bfeb48SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) 91302bfeb48SBjorn Helgaas host_bridge->native_pme = 0; 914af8bb9f8SBjorn Helgaas if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) 915af8bb9f8SBjorn Helgaas host_bridge->native_ltr = 0; 916ac1c8e35SKuppuswamy Sathyanarayanan if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) 917ac1c8e35SKuppuswamy Sathyanarayanan host_bridge->native_dpc = 0; 91802bfeb48SBjorn Helgaas 919a78cf965SBenjamin Herrenschmidt /* 920a78cf965SBenjamin Herrenschmidt * Evaluate the "PCI Boot Configuration" _DSM Function. If it 921a78cf965SBenjamin Herrenschmidt * exists and returns 0, we must preserve any PCI resource 922a78cf965SBenjamin Herrenschmidt * assignments made by firmware for this host bridge. 923a78cf965SBenjamin Herrenschmidt */ 924a78cf965SBenjamin Herrenschmidt obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, 9253910ebacSKrzysztof Wilczyński DSM_PCI_PRESERVE_BOOT_CONFIG, NULL); 926a78cf965SBenjamin Herrenschmidt if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) 927a78cf965SBenjamin Herrenschmidt host_bridge->preserve_config = 1; 928a78cf965SBenjamin Herrenschmidt ACPI_FREE(obj); 929a78cf965SBenjamin Herrenschmidt 930*62d52871SRafael J. Wysocki acpi_dev_power_up_children_with_adr(device); 931*62d52871SRafael J. Wysocki 9322c204383SJiang Liu pci_scan_child_bus(bus); 93302bfeb48SBjorn Helgaas pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, 93402bfeb48SBjorn Helgaas info); 9352c204383SJiang Liu if (node != NUMA_NO_NODE) 9362c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 9372c204383SJiang Liu return bus; 9382c204383SJiang Liu 9392c204383SJiang Liu out_release_info: 9402c204383SJiang Liu __acpi_pci_root_release_info(info); 9412c204383SJiang Liu return NULL; 9422c204383SJiang Liu } 9432c204383SJiang Liu 94400c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 9451da177e4SLinus Torvalds { 9463338db00SRafael J. Wysocki if (acpi_pci_disabled) 9473338db00SRafael J. Wysocki return; 948d3072e6aSRafael J. Wysocki 9497bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 9503338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 951668192b6SYinghai Lu } 952