11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 121da177e4SLinus Torvalds * your option) any later version. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 151da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 171da177e4SLinus Torvalds * General Public License for more details. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <linux/kernel.h> 231da177e4SLinus Torvalds #include <linux/module.h> 241da177e4SLinus Torvalds #include <linux/init.h> 251da177e4SLinus Torvalds #include <linux/types.h> 26d0020f65STaku Izumi #include <linux/mutex.h> 271da177e4SLinus Torvalds #include <linux/pm.h> 28b67ea761SRafael J. Wysocki #include <linux/pm_runtime.h> 291da177e4SLinus Torvalds #include <linux/pci.h> 30990a7ac5SAndrew Patterson #include <linux/pci-acpi.h> 31eca67315SNaga Chumbalkar #include <linux/pci-aspm.h> 32864b94adSJiang Liu #include <linux/dmar.h> 331da177e4SLinus Torvalds #include <linux/acpi.h> 345a0e3ad6STejun Heo #include <linux/slab.h> 357bc5a2baSMatthew Garrett #include <linux/dmi.h> 368b48463fSLv Zheng #include <acpi/apei.h> /* for acpi_hest_init() */ 371da177e4SLinus Torvalds 38ace8238bSRafael J. Wysocki #include "internal.h" 39ace8238bSRafael J. Wysocki 401da177e4SLinus Torvalds #define _COMPONENT ACPI_PCI_COMPONENT 41f52fd66dSLen Brown ACPI_MODULE_NAME("pci_root"); 421da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 431da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 4400c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 4500c43b96SRafael J. Wysocki const struct acpi_device_id *not_used); 4600c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device); 471da177e4SLinus Torvalds 483338db00SRafael J. Wysocki static int acpi_pci_root_scan_dependent(struct acpi_device *adev) 493338db00SRafael J. Wysocki { 501f7c164bSRafael J. Wysocki acpiphp_check_host_bridge(adev); 513338db00SRafael J. Wysocki return 0; 523338db00SRafael J. Wysocki } 533338db00SRafael J. Wysocki 547dab9ef4SBjorn Helgaas #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ 557dab9ef4SBjorn Helgaas | OSC_PCI_ASPM_SUPPORT \ 567dab9ef4SBjorn Helgaas | OSC_PCI_CLOCK_PM_SUPPORT \ 577dab9ef4SBjorn Helgaas | OSC_PCI_MSI_SUPPORT) 58415e12b2SRafael J. Wysocki 59c97adf9eSMárton Németh static const struct acpi_device_id root_device_ids[] = { 601ba90e3aSThomas Renninger {"PNP0A03", 0}, 611ba90e3aSThomas Renninger {"", 0}, 621ba90e3aSThomas Renninger }; 631ba90e3aSThomas Renninger 6400c43b96SRafael J. Wysocki static struct acpi_scan_handler pci_root_handler = { 651ba90e3aSThomas Renninger .ids = root_device_ids, 6600c43b96SRafael J. Wysocki .attach = acpi_pci_root_add, 6700c43b96SRafael J. Wysocki .detach = acpi_pci_root_remove, 68ca499fc8SToshi Kani .hotplug = { 693338db00SRafael J. Wysocki .enabled = true, 703338db00SRafael J. Wysocki .scan_dependent = acpi_pci_root_scan_dependent, 71ca499fc8SToshi Kani }, 721da177e4SLinus Torvalds }; 731da177e4SLinus Torvalds 7463f10f0fSKenji Kaneshige static DEFINE_MUTEX(osc_lock); 751da177e4SLinus Torvalds 7627558203SAlexander Chiang /** 7727558203SAlexander Chiang * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge 7827558203SAlexander Chiang * @handle - the ACPI CA node in question. 7927558203SAlexander Chiang * 8027558203SAlexander Chiang * Note: we could make this API take a struct acpi_device * instead, but 8127558203SAlexander Chiang * for now, it's more convenient to operate on an acpi_handle. 8227558203SAlexander Chiang */ 8327558203SAlexander Chiang int acpi_is_root_bridge(acpi_handle handle) 8427558203SAlexander Chiang { 8527558203SAlexander Chiang int ret; 8627558203SAlexander Chiang struct acpi_device *device; 8727558203SAlexander Chiang 8827558203SAlexander Chiang ret = acpi_bus_get_device(handle, &device); 8927558203SAlexander Chiang if (ret) 9027558203SAlexander Chiang return 0; 9127558203SAlexander Chiang 9227558203SAlexander Chiang ret = acpi_match_device_ids(device, root_device_ids); 9327558203SAlexander Chiang if (ret) 9427558203SAlexander Chiang return 0; 9527558203SAlexander Chiang else 9627558203SAlexander Chiang return 1; 9727558203SAlexander Chiang } 9827558203SAlexander Chiang EXPORT_SYMBOL_GPL(acpi_is_root_bridge); 9927558203SAlexander Chiang 1001da177e4SLinus Torvalds static acpi_status 1011da177e4SLinus Torvalds get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) 1021da177e4SLinus Torvalds { 1036ad95513SBjorn Helgaas struct resource *res = data; 1041da177e4SLinus Torvalds struct acpi_resource_address64 address; 105f6c1c8ffSBjorn Helgaas acpi_status status; 1061da177e4SLinus Torvalds 107f6c1c8ffSBjorn Helgaas status = acpi_resource_to_address64(resource, &address); 108f6c1c8ffSBjorn Helgaas if (ACPI_FAILURE(status)) 1091da177e4SLinus Torvalds return AE_OK; 1101da177e4SLinus Torvalds 111a45de93eSLv Zheng if ((address.address.address_length > 0) && 1126ad95513SBjorn Helgaas (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { 113a45de93eSLv Zheng res->start = address.address.minimum; 114a45de93eSLv Zheng res->end = address.address.minimum + address.address.address_length - 1; 1156ad95513SBjorn Helgaas } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds return AE_OK; 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 120f5eebbe1SBjorn Helgaas static acpi_status try_get_root_bridge_busnr(acpi_handle handle, 1216ad95513SBjorn Helgaas struct resource *res) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds acpi_status status; 1241da177e4SLinus Torvalds 1256ad95513SBjorn Helgaas res->start = -1; 1264be44fcdSLen Brown status = 1274be44fcdSLen Brown acpi_walk_resources(handle, METHOD_NAME__CRS, 1286ad95513SBjorn Helgaas get_root_bridge_busnr_callback, res); 1291da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1301da177e4SLinus Torvalds return status; 1316ad95513SBjorn Helgaas if (res->start == -1) 1321da177e4SLinus Torvalds return AE_ERROR; 1331da177e4SLinus Torvalds return AE_OK; 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 136955f14b4SBjorn Helgaas struct pci_osc_bit_struct { 137955f14b4SBjorn Helgaas u32 bit; 138955f14b4SBjorn Helgaas char *desc; 139955f14b4SBjorn Helgaas }; 140955f14b4SBjorn Helgaas 141955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_support_bit[] = { 142955f14b4SBjorn Helgaas { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, 143955f14b4SBjorn Helgaas { OSC_PCI_ASPM_SUPPORT, "ASPM" }, 144955f14b4SBjorn Helgaas { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, 145955f14b4SBjorn Helgaas { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, 146955f14b4SBjorn Helgaas { OSC_PCI_MSI_SUPPORT, "MSI" }, 147955f14b4SBjorn Helgaas }; 148955f14b4SBjorn Helgaas 149955f14b4SBjorn Helgaas static struct pci_osc_bit_struct pci_osc_control_bit[] = { 150955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, 151955f14b4SBjorn Helgaas { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, 152955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, 153955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, 154955f14b4SBjorn Helgaas { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, 155955f14b4SBjorn Helgaas }; 156955f14b4SBjorn Helgaas 157955f14b4SBjorn Helgaas static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, 158955f14b4SBjorn Helgaas struct pci_osc_bit_struct *table, int size) 159955f14b4SBjorn Helgaas { 160955f14b4SBjorn Helgaas char buf[80]; 161955f14b4SBjorn Helgaas int i, len = 0; 162955f14b4SBjorn Helgaas struct pci_osc_bit_struct *entry; 163955f14b4SBjorn Helgaas 164955f14b4SBjorn Helgaas buf[0] = '\0'; 165955f14b4SBjorn Helgaas for (i = 0, entry = table; i < size; i++, entry++) 166955f14b4SBjorn Helgaas if (word & entry->bit) 167955f14b4SBjorn Helgaas len += snprintf(buf + len, sizeof(buf) - len, "%s%s", 168955f14b4SBjorn Helgaas len ? " " : "", entry->desc); 169955f14b4SBjorn Helgaas 170955f14b4SBjorn Helgaas dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); 171955f14b4SBjorn Helgaas } 172955f14b4SBjorn Helgaas 173955f14b4SBjorn Helgaas static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) 174955f14b4SBjorn Helgaas { 175955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_support_bit, 176955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_support_bit)); 177955f14b4SBjorn Helgaas } 178955f14b4SBjorn Helgaas 179955f14b4SBjorn Helgaas static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) 180955f14b4SBjorn Helgaas { 181955f14b4SBjorn Helgaas decode_osc_bits(root, msg, word, pci_osc_control_bit, 182955f14b4SBjorn Helgaas ARRAY_SIZE(pci_osc_control_bit)); 183955f14b4SBjorn Helgaas } 184955f14b4SBjorn Helgaas 1853a9622dcSShaohua Li static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; 18663f10f0fSKenji Kaneshige 18763f10f0fSKenji Kaneshige static acpi_status acpi_pci_run_osc(acpi_handle handle, 18863f10f0fSKenji Kaneshige const u32 *capbuf, u32 *retval) 18963f10f0fSKenji Kaneshige { 1903a9622dcSShaohua Li struct acpi_osc_context context = { 1913a9622dcSShaohua Li .uuid_str = pci_osc_uuid_str, 1923a9622dcSShaohua Li .rev = 1, 1933a9622dcSShaohua Li .cap.length = 12, 1943a9622dcSShaohua Li .cap.pointer = (void *)capbuf, 1953a9622dcSShaohua Li }; 19663f10f0fSKenji Kaneshige acpi_status status; 19763f10f0fSKenji Kaneshige 1983a9622dcSShaohua Li status = acpi_run_osc(handle, &context); 1993a9622dcSShaohua Li if (ACPI_SUCCESS(status)) { 2003a9622dcSShaohua Li *retval = *((u32 *)(context.ret.pointer + 8)); 2013a9622dcSShaohua Li kfree(context.ret.pointer); 20263f10f0fSKenji Kaneshige } 20363f10f0fSKenji Kaneshige return status; 20463f10f0fSKenji Kaneshige } 20563f10f0fSKenji Kaneshige 206ab8e8957SRafael J. Wysocki static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, 207ab8e8957SRafael J. Wysocki u32 support, 208ab8e8957SRafael J. Wysocki u32 *control) 20963f10f0fSKenji Kaneshige { 21063f10f0fSKenji Kaneshige acpi_status status; 211ab8e8957SRafael J. Wysocki u32 result, capbuf[3]; 21263f10f0fSKenji Kaneshige 213ab8e8957SRafael J. Wysocki support &= OSC_PCI_SUPPORT_MASKS; 214ab8e8957SRafael J. Wysocki support |= root->osc_support_set; 215ab8e8957SRafael J. Wysocki 216b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 217b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = support; 218ab8e8957SRafael J. Wysocki if (control) { 219ab8e8957SRafael J. Wysocki *control &= OSC_PCI_CONTROL_MASKS; 220b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; 221ab8e8957SRafael J. Wysocki } else { 222545d6e18SYinghai Lu /* Run _OSC query only with existing controls. */ 223b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; 224ab8e8957SRafael J. Wysocki } 22563f10f0fSKenji Kaneshige 22663f10f0fSKenji Kaneshige status = acpi_pci_run_osc(root->device->handle, capbuf, &result); 22763f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) { 228ab8e8957SRafael J. Wysocki root->osc_support_set = support; 2292b8fd918SRafael J. Wysocki if (control) 230ab8e8957SRafael J. Wysocki *control = result; 231ab8e8957SRafael J. Wysocki } 23263f10f0fSKenji Kaneshige return status; 23363f10f0fSKenji Kaneshige } 23463f10f0fSKenji Kaneshige 23563f10f0fSKenji Kaneshige static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 23663f10f0fSKenji Kaneshige { 23763f10f0fSKenji Kaneshige acpi_status status; 23863f10f0fSKenji Kaneshige 23963f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 240ab8e8957SRafael J. Wysocki status = acpi_pci_query_osc(root, flags, NULL); 24163f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 24263f10f0fSKenji Kaneshige return status; 24363f10f0fSKenji Kaneshige } 24463f10f0fSKenji Kaneshige 24576d56de5SAlex Chiang struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) 24663f10f0fSKenji Kaneshige { 24763f10f0fSKenji Kaneshige struct acpi_pci_root *root; 248cd4faf9cSTaku Izumi struct acpi_device *device; 249c1aec834SBjorn Helgaas 250cd4faf9cSTaku Izumi if (acpi_bus_get_device(handle, &device) || 251cd4faf9cSTaku Izumi acpi_match_device_ids(device, root_device_ids)) 25263f10f0fSKenji Kaneshige return NULL; 253cd4faf9cSTaku Izumi 254cd4faf9cSTaku Izumi root = acpi_driver_data(device); 255cd4faf9cSTaku Izumi 256cd4faf9cSTaku Izumi return root; 25763f10f0fSKenji Kaneshige } 25876d56de5SAlex Chiang EXPORT_SYMBOL_GPL(acpi_pci_find_root); 25963f10f0fSKenji Kaneshige 2602f7bbcebSAlexander Chiang struct acpi_handle_node { 2612f7bbcebSAlexander Chiang struct list_head node; 2622f7bbcebSAlexander Chiang acpi_handle handle; 2632f7bbcebSAlexander Chiang }; 2642f7bbcebSAlexander Chiang 2652f7bbcebSAlexander Chiang /** 2662f7bbcebSAlexander Chiang * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev 2672f7bbcebSAlexander Chiang * @handle: the handle in question 2682f7bbcebSAlexander Chiang * 2692f7bbcebSAlexander Chiang * Given an ACPI CA handle, the desired PCI device is located in the 2702f7bbcebSAlexander Chiang * list of PCI devices. 2712f7bbcebSAlexander Chiang * 2722f7bbcebSAlexander Chiang * If the device is found, its reference count is increased and this 2732f7bbcebSAlexander Chiang * function returns a pointer to its data structure. The caller must 2742f7bbcebSAlexander Chiang * decrement the reference count by calling pci_dev_put(). 2752f7bbcebSAlexander Chiang * If no device is found, %NULL is returned. 2762f7bbcebSAlexander Chiang */ 2772f7bbcebSAlexander Chiang struct pci_dev *acpi_get_pci_dev(acpi_handle handle) 2782f7bbcebSAlexander Chiang { 2792f7bbcebSAlexander Chiang int dev, fn; 2802f7bbcebSAlexander Chiang unsigned long long adr; 2812f7bbcebSAlexander Chiang acpi_status status; 2822f7bbcebSAlexander Chiang acpi_handle phandle; 2832f7bbcebSAlexander Chiang struct pci_bus *pbus; 2842f7bbcebSAlexander Chiang struct pci_dev *pdev = NULL; 2852f7bbcebSAlexander Chiang struct acpi_handle_node *node, *tmp; 2862f7bbcebSAlexander Chiang struct acpi_pci_root *root; 2872f7bbcebSAlexander Chiang LIST_HEAD(device_list); 2882f7bbcebSAlexander Chiang 2892f7bbcebSAlexander Chiang /* 2902f7bbcebSAlexander Chiang * Walk up the ACPI CA namespace until we reach a PCI root bridge. 2912f7bbcebSAlexander Chiang */ 2922f7bbcebSAlexander Chiang phandle = handle; 2932f7bbcebSAlexander Chiang while (!acpi_is_root_bridge(phandle)) { 2942f7bbcebSAlexander Chiang node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); 2952f7bbcebSAlexander Chiang if (!node) 2962f7bbcebSAlexander Chiang goto out; 2972f7bbcebSAlexander Chiang 2982f7bbcebSAlexander Chiang INIT_LIST_HEAD(&node->node); 2992f7bbcebSAlexander Chiang node->handle = phandle; 3002f7bbcebSAlexander Chiang list_add(&node->node, &device_list); 3012f7bbcebSAlexander Chiang 3022f7bbcebSAlexander Chiang status = acpi_get_parent(phandle, &phandle); 3032f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3042f7bbcebSAlexander Chiang goto out; 3052f7bbcebSAlexander Chiang } 3062f7bbcebSAlexander Chiang 3072f7bbcebSAlexander Chiang root = acpi_pci_find_root(phandle); 3082f7bbcebSAlexander Chiang if (!root) 3092f7bbcebSAlexander Chiang goto out; 3102f7bbcebSAlexander Chiang 3112f7bbcebSAlexander Chiang pbus = root->bus; 3122f7bbcebSAlexander Chiang 3132f7bbcebSAlexander Chiang /* 3142f7bbcebSAlexander Chiang * Now, walk back down the PCI device tree until we return to our 3152f7bbcebSAlexander Chiang * original handle. Assumes that everything between the PCI root 3162f7bbcebSAlexander Chiang * bridge and the device we're looking for must be a P2P bridge. 3172f7bbcebSAlexander Chiang */ 3182f7bbcebSAlexander Chiang list_for_each_entry(node, &device_list, node) { 3192f7bbcebSAlexander Chiang acpi_handle hnd = node->handle; 3202f7bbcebSAlexander Chiang status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); 3212f7bbcebSAlexander Chiang if (ACPI_FAILURE(status)) 3222f7bbcebSAlexander Chiang goto out; 3232f7bbcebSAlexander Chiang dev = (adr >> 16) & 0xffff; 3242f7bbcebSAlexander Chiang fn = adr & 0xffff; 3252f7bbcebSAlexander Chiang 3262f7bbcebSAlexander Chiang pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); 327412af978STroy Moure if (!pdev || hnd == handle) 3282f7bbcebSAlexander Chiang break; 3292f7bbcebSAlexander Chiang 3302f7bbcebSAlexander Chiang pbus = pdev->subordinate; 3312f7bbcebSAlexander Chiang pci_dev_put(pdev); 332497fb54fSRafael J. Wysocki 333497fb54fSRafael J. Wysocki /* 334497fb54fSRafael J. Wysocki * This function may be called for a non-PCI device that has a 335497fb54fSRafael J. Wysocki * PCI parent (eg. a disk under a PCI SATA controller). In that 336497fb54fSRafael J. Wysocki * case pdev->subordinate will be NULL for the parent. 337497fb54fSRafael J. Wysocki */ 338497fb54fSRafael J. Wysocki if (!pbus) { 339497fb54fSRafael J. Wysocki dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); 340497fb54fSRafael J. Wysocki pdev = NULL; 341497fb54fSRafael J. Wysocki break; 342497fb54fSRafael J. Wysocki } 3432f7bbcebSAlexander Chiang } 3442f7bbcebSAlexander Chiang out: 3452f7bbcebSAlexander Chiang list_for_each_entry_safe(node, tmp, &device_list, node) 3462f7bbcebSAlexander Chiang kfree(node); 3472f7bbcebSAlexander Chiang 3482f7bbcebSAlexander Chiang return pdev; 3492f7bbcebSAlexander Chiang } 3502f7bbcebSAlexander Chiang EXPORT_SYMBOL_GPL(acpi_get_pci_dev); 3512f7bbcebSAlexander Chiang 35263f10f0fSKenji Kaneshige /** 35375fb60f2SRafael J. Wysocki * acpi_pci_osc_control_set - Request control of PCI root _OSC features. 35475fb60f2SRafael J. Wysocki * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). 35575fb60f2SRafael J. Wysocki * @mask: Mask of _OSC bits to request control of, place to store control mask. 35675fb60f2SRafael J. Wysocki * @req: Mask of _OSC bits the control of is essential to the caller. 35763f10f0fSKenji Kaneshige * 35875fb60f2SRafael J. Wysocki * Run _OSC query for @mask and if that is successful, compare the returned 35975fb60f2SRafael J. Wysocki * mask of control bits with @req. If all of the @req bits are set in the 36075fb60f2SRafael J. Wysocki * returned mask, run _OSC request for it. 36175fb60f2SRafael J. Wysocki * 36275fb60f2SRafael J. Wysocki * The variable at the @mask address may be modified regardless of whether or 36375fb60f2SRafael J. Wysocki * not the function returns success. On success it will contain the mask of 36475fb60f2SRafael J. Wysocki * _OSC bits the BIOS has granted control of, but its contents are meaningless 36575fb60f2SRafael J. Wysocki * on failure. 36663f10f0fSKenji Kaneshige **/ 36775fb60f2SRafael J. Wysocki acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) 36863f10f0fSKenji Kaneshige { 36963f10f0fSKenji Kaneshige struct acpi_pci_root *root; 3704ffe6e54SBjorn Helgaas acpi_status status = AE_OK; 37175fb60f2SRafael J. Wysocki u32 ctrl, capbuf[3]; 37263f10f0fSKenji Kaneshige 37375fb60f2SRafael J. Wysocki if (!mask) 37475fb60f2SRafael J. Wysocki return AE_BAD_PARAMETER; 37575fb60f2SRafael J. Wysocki 37675fb60f2SRafael J. Wysocki ctrl = *mask & OSC_PCI_CONTROL_MASKS; 37775fb60f2SRafael J. Wysocki if ((ctrl & req) != req) 37863f10f0fSKenji Kaneshige return AE_TYPE; 37963f10f0fSKenji Kaneshige 38063f10f0fSKenji Kaneshige root = acpi_pci_find_root(handle); 38163f10f0fSKenji Kaneshige if (!root) 38263f10f0fSKenji Kaneshige return AE_NOT_EXIST; 38363f10f0fSKenji Kaneshige 38463f10f0fSKenji Kaneshige mutex_lock(&osc_lock); 38575fb60f2SRafael J. Wysocki 38675fb60f2SRafael J. Wysocki *mask = ctrl | root->osc_control_set; 38763f10f0fSKenji Kaneshige /* No need to evaluate _OSC if the control was already granted. */ 38875fb60f2SRafael J. Wysocki if ((root->osc_control_set & ctrl) == ctrl) 38963f10f0fSKenji Kaneshige goto out; 39063f10f0fSKenji Kaneshige 39175fb60f2SRafael J. Wysocki /* Need to check the available controls bits before requesting them. */ 39275fb60f2SRafael J. Wysocki while (*mask) { 39375fb60f2SRafael J. Wysocki status = acpi_pci_query_osc(root, root->osc_support_set, mask); 39463f10f0fSKenji Kaneshige if (ACPI_FAILURE(status)) 39563f10f0fSKenji Kaneshige goto out; 39675fb60f2SRafael J. Wysocki if (ctrl == *mask) 39775fb60f2SRafael J. Wysocki break; 398955f14b4SBjorn Helgaas decode_osc_control(root, "platform does not support", 399955f14b4SBjorn Helgaas ctrl & ~(*mask)); 40075fb60f2SRafael J. Wysocki ctrl = *mask; 40175fb60f2SRafael J. Wysocki } 4022b8fd918SRafael J. Wysocki 40375fb60f2SRafael J. Wysocki if ((ctrl & req) != req) { 404955f14b4SBjorn Helgaas decode_osc_control(root, "not requesting control; platform does not support", 405955f14b4SBjorn Helgaas req & ~(ctrl)); 40663f10f0fSKenji Kaneshige status = AE_SUPPORT; 40763f10f0fSKenji Kaneshige goto out; 40863f10f0fSKenji Kaneshige } 40963f10f0fSKenji Kaneshige 410b938a229SBjorn Helgaas capbuf[OSC_QUERY_DWORD] = 0; 411b938a229SBjorn Helgaas capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; 412b938a229SBjorn Helgaas capbuf[OSC_CONTROL_DWORD] = ctrl; 41375fb60f2SRafael J. Wysocki status = acpi_pci_run_osc(handle, capbuf, mask); 41463f10f0fSKenji Kaneshige if (ACPI_SUCCESS(status)) 41575fb60f2SRafael J. Wysocki root->osc_control_set = *mask; 41663f10f0fSKenji Kaneshige out: 41763f10f0fSKenji Kaneshige mutex_unlock(&osc_lock); 41863f10f0fSKenji Kaneshige return status; 41963f10f0fSKenji Kaneshige } 4209f5404d8SKenji Kaneshige EXPORT_SYMBOL(acpi_pci_osc_control_set); 42163f10f0fSKenji Kaneshige 422387d3757SMatthew Garrett static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) 4233e43abb0SBjorn Helgaas { 424955f14b4SBjorn Helgaas u32 support, control, requested; 4253e43abb0SBjorn Helgaas acpi_status status; 4263e43abb0SBjorn Helgaas struct acpi_device *device = root->device; 4273e43abb0SBjorn Helgaas acpi_handle handle = device->handle; 4283e43abb0SBjorn Helgaas 4293e43abb0SBjorn Helgaas /* 4307bc5a2baSMatthew Garrett * Apple always return failure on _OSC calls when _OSI("Darwin") has 4317bc5a2baSMatthew Garrett * been called successfully. We know the feature set supported by the 4327bc5a2baSMatthew Garrett * platform, so avoid calling _OSC at all 4337bc5a2baSMatthew Garrett */ 4347bc5a2baSMatthew Garrett 4357bc5a2baSMatthew Garrett if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) { 4367bc5a2baSMatthew Garrett root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; 4377bc5a2baSMatthew Garrett decode_osc_control(root, "OS assumes control of", 4387bc5a2baSMatthew Garrett root->osc_control_set); 4397bc5a2baSMatthew Garrett return; 4407bc5a2baSMatthew Garrett } 4417bc5a2baSMatthew Garrett 4427bc5a2baSMatthew Garrett /* 4433e43abb0SBjorn Helgaas * All supported architectures that use ACPI have support for 4443e43abb0SBjorn Helgaas * PCI domains, so we indicate this in _OSC support capabilities. 4453e43abb0SBjorn Helgaas */ 44665afe916SBjorn Helgaas support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; 4473e43abb0SBjorn Helgaas if (pci_ext_cfg_avail()) 448b8eb67fcSBjorn Helgaas support |= OSC_PCI_EXT_CONFIG_SUPPORT; 4491b2a7be6SBjorn Helgaas if (pcie_aspm_support_enabled()) 450b8eb67fcSBjorn Helgaas support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; 4513e43abb0SBjorn Helgaas if (pci_msi_enabled()) 452b8eb67fcSBjorn Helgaas support |= OSC_PCI_MSI_SUPPORT; 453955f14b4SBjorn Helgaas 454955f14b4SBjorn Helgaas decode_osc_support(root, "OS supports", support); 455b8eb67fcSBjorn Helgaas status = acpi_pci_osc_support(root, support); 4563e43abb0SBjorn Helgaas if (ACPI_FAILURE(status)) { 45765afe916SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 45865afe916SBjorn Helgaas acpi_format_exception(status)); 4593e43abb0SBjorn Helgaas *no_aspm = 1; 46065afe916SBjorn Helgaas return; 4613e43abb0SBjorn Helgaas } 4623e43abb0SBjorn Helgaas 46343613a1fSBjorn Helgaas if (pcie_ports_disabled) { 46443613a1fSBjorn Helgaas dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); 46543613a1fSBjorn Helgaas return; 46643613a1fSBjorn Helgaas } 46743613a1fSBjorn Helgaas 468de189662SBjorn Helgaas if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { 469955f14b4SBjorn Helgaas decode_osc_support(root, "not requesting OS control; OS requires", 470955f14b4SBjorn Helgaas ACPI_PCIE_REQ_SUPPORT); 471de189662SBjorn Helgaas return; 472de189662SBjorn Helgaas } 473de189662SBjorn Helgaas 474b8eb67fcSBjorn Helgaas control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL 4753e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL 4763e43abb0SBjorn Helgaas | OSC_PCI_EXPRESS_PME_CONTROL; 4773e43abb0SBjorn Helgaas 4783e43abb0SBjorn Helgaas if (pci_aer_available()) { 4793e43abb0SBjorn Helgaas if (aer_acpi_firmware_first()) 480955f14b4SBjorn Helgaas dev_info(&device->dev, 481955f14b4SBjorn Helgaas "PCIe AER handled by firmware\n"); 4823e43abb0SBjorn Helgaas else 483b8eb67fcSBjorn Helgaas control |= OSC_PCI_EXPRESS_AER_CONTROL; 4843e43abb0SBjorn Helgaas } 4853e43abb0SBjorn Helgaas 486955f14b4SBjorn Helgaas requested = control; 487b8eb67fcSBjorn Helgaas status = acpi_pci_osc_control_set(handle, &control, 4883e43abb0SBjorn Helgaas OSC_PCI_EXPRESS_CAPABILITY_CONTROL); 4893e43abb0SBjorn Helgaas if (ACPI_SUCCESS(status)) { 490955f14b4SBjorn Helgaas decode_osc_control(root, "OS now controls", control); 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 { 501955f14b4SBjorn Helgaas decode_osc_control(root, "OS requested", requested); 502955f14b4SBjorn Helgaas decode_osc_control(root, "platform willing to grant", control); 503955f14b4SBjorn Helgaas dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", 504955f14b4SBjorn Helgaas acpi_format_exception(status)); 505955f14b4SBjorn Helgaas 5063e43abb0SBjorn Helgaas /* 5073e43abb0SBjorn Helgaas * We want to disable ASPM here, but aspm_disabled 5083e43abb0SBjorn Helgaas * needs to remain in its state from boot so that we 5093e43abb0SBjorn Helgaas * properly handle PCIe 1.1 devices. So we set this 5103e43abb0SBjorn Helgaas * flag here, to defer the action until after the ACPI 5113e43abb0SBjorn Helgaas * root scan. 5123e43abb0SBjorn Helgaas */ 5133e43abb0SBjorn Helgaas *no_aspm = 1; 5143e43abb0SBjorn Helgaas } 5153e43abb0SBjorn Helgaas } 5163e43abb0SBjorn Helgaas 51700c43b96SRafael J. Wysocki static int acpi_pci_root_add(struct acpi_device *device, 51800c43b96SRafael J. Wysocki const struct acpi_device_id *not_used) 5191da177e4SLinus Torvalds { 520f5eebbe1SBjorn Helgaas unsigned long long segment, bus; 521f5eebbe1SBjorn Helgaas acpi_status status; 522f5eebbe1SBjorn Helgaas int result; 523f5eebbe1SBjorn Helgaas struct acpi_pci_root *root; 524bfe2414aSJiang Liu acpi_handle handle = device->handle; 525387d3757SMatthew Garrett int no_aspm = 0; 526864b94adSJiang Liu bool hotadd = system_state != SYSTEM_BOOTING; 5271da177e4SLinus Torvalds 5286ad95513SBjorn Helgaas root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 5296ad95513SBjorn Helgaas if (!root) 5306ad95513SBjorn Helgaas return -ENOMEM; 5316ad95513SBjorn Helgaas 532f5eebbe1SBjorn Helgaas segment = 0; 533bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, 534f5eebbe1SBjorn Helgaas &segment); 535f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 5366dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _SEG\n"); 5376ad95513SBjorn Helgaas result = -ENODEV; 5386ad95513SBjorn Helgaas goto end; 539f5eebbe1SBjorn Helgaas } 5401da177e4SLinus Torvalds 541f5eebbe1SBjorn Helgaas /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ 5426ad95513SBjorn Helgaas root->secondary.flags = IORESOURCE_BUS; 543bfe2414aSJiang Liu status = try_get_root_bridge_busnr(handle, &root->secondary); 544f5eebbe1SBjorn Helgaas if (ACPI_FAILURE(status)) { 5456ad95513SBjorn Helgaas /* 5466ad95513SBjorn Helgaas * We need both the start and end of the downstream bus range 5476ad95513SBjorn Helgaas * to interpret _CBA (MMCONFIG base address), so it really is 5486ad95513SBjorn Helgaas * supposed to be in _CRS. If we don't find it there, all we 5496ad95513SBjorn Helgaas * can do is assume [_BBN-0xFF] or [0-0xFF]. 5506ad95513SBjorn Helgaas */ 5516ad95513SBjorn Helgaas root->secondary.end = 0xFF; 5526dc7d22cSJiang Liu dev_warn(&device->dev, 5536dc7d22cSJiang Liu FW_BUG "no secondary bus range in _CRS\n"); 554bfe2414aSJiang Liu status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, 555e545b55aSJon Mason NULL, &bus); 5566ad95513SBjorn Helgaas if (ACPI_SUCCESS(status)) 5576ad95513SBjorn Helgaas root->secondary.start = bus; 5586ad95513SBjorn Helgaas else if (status == AE_NOT_FOUND) 5596ad95513SBjorn Helgaas root->secondary.start = 0; 5606ad95513SBjorn Helgaas else { 5616dc7d22cSJiang Liu dev_err(&device->dev, "can't evaluate _BBN\n"); 5626ad95513SBjorn Helgaas result = -ENODEV; 5636ad95513SBjorn Helgaas goto end; 564f5eebbe1SBjorn Helgaas } 565f5eebbe1SBjorn Helgaas } 5661da177e4SLinus Torvalds 56732917e5bSPatrick Mochel root->device = device; 5680705495dSBjorn Helgaas root->segment = segment & 0xFFFF; 5691da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 5701da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 571db89b4f0SPavel Machek device->driver_data = root; 5721da177e4SLinus Torvalds 573864b94adSJiang Liu if (hotadd && dmar_device_add(handle)) { 574864b94adSJiang Liu result = -ENXIO; 575864b94adSJiang Liu goto end; 576864b94adSJiang Liu } 577864b94adSJiang Liu 5786dc7d22cSJiang Liu pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", 579d4761ba2SBjorn Helgaas acpi_device_name(device), acpi_device_bid(device), 580d4761ba2SBjorn Helgaas root->segment, &root->secondary); 581d4761ba2SBjorn Helgaas 582bfe2414aSJiang Liu root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); 583f4b57a3bSJiang Liu 584387d3757SMatthew Garrett negotiate_os_control(root, &no_aspm); 585415e12b2SRafael J. Wysocki 5863dc48af3SNeil Horman /* 5873dc48af3SNeil Horman * TBD: Need PCI interface for enumeration/configuration of roots. 5883dc48af3SNeil Horman */ 5893dc48af3SNeil Horman 5903dc48af3SNeil Horman /* 5913dc48af3SNeil Horman * Scan the Root Bridge 5923dc48af3SNeil Horman * -------------------- 5933dc48af3SNeil Horman * Must do this prior to any attempt to bind the root device, as the 5943dc48af3SNeil Horman * PCI namespace does not get created until this call is made (and 5953dc48af3SNeil Horman * thus the root bridge's pci_dev does not exist). 5963dc48af3SNeil Horman */ 5973dc48af3SNeil Horman root->bus = pci_acpi_scan_root(root); 5983dc48af3SNeil Horman if (!root->bus) { 5993dc48af3SNeil Horman dev_err(&device->dev, 6003dc48af3SNeil Horman "Bus %04x:%02x not present in PCI namespace\n", 6013dc48af3SNeil Horman root->segment, (unsigned int)root->secondary.start); 602f516bde5SRafael J. Wysocki device->driver_data = NULL; 6033dc48af3SNeil Horman result = -ENODEV; 604864b94adSJiang Liu goto remove_dmar; 6053dc48af3SNeil Horman } 6063dc48af3SNeil Horman 6073dc48af3SNeil Horman if (no_aspm) 6083dc48af3SNeil Horman pcie_no_aspm(); 6093dc48af3SNeil Horman 610c072530fSRafael J. Wysocki pci_acpi_add_bus_pm_notifier(device); 611b67ea761SRafael J. Wysocki if (device->wakeup.flags.run_wake) 612b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, true); 613b67ea761SRafael J. Wysocki 614864b94adSJiang Liu if (hotadd) { 6153c449ed0SYinghai Lu pcibios_resource_survey_bus(root->bus); 61639772038SYinghai Lu pci_assign_unassigned_root_bus_resources(root->bus); 617c183619bSJiang Liu acpi_ioapic_add(root); 618516ca223SJiang Liu } 61962a08c5aSYinghai Lu 6207a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 621c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 6227a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 62300c43b96SRafael J. Wysocki return 1; 62447525cdaSRafael J. Wysocki 625864b94adSJiang Liu remove_dmar: 626864b94adSJiang Liu if (hotadd) 627864b94adSJiang Liu dmar_device_remove(handle); 62847525cdaSRafael J. Wysocki end: 62947525cdaSRafael J. Wysocki kfree(root); 63047525cdaSRafael J. Wysocki return result; 631c431ada4SRajesh Shah } 6321da177e4SLinus Torvalds 63300c43b96SRafael J. Wysocki static void acpi_pci_root_remove(struct acpi_device *device) 6341da177e4SLinus Torvalds { 635caf420c6SBjorn Helgaas struct acpi_pci_root *root = acpi_driver_data(device); 636c8e9afb1SJiang Liu 6377a3bb55eSRafael J. Wysocki pci_lock_rescan_remove(); 6387a3bb55eSRafael J. Wysocki 6399738a1fdSYinghai Lu pci_stop_root_bus(root->bus); 6409738a1fdSYinghai Lu 641c183619bSJiang Liu WARN_ON(acpi_ioapic_remove(root)); 642c183619bSJiang Liu 643b67ea761SRafael J. Wysocki device_set_run_wake(root->bus->bridge, false); 644b67ea761SRafael J. Wysocki pci_acpi_remove_bus_pm_notifier(device); 645b67ea761SRafael J. Wysocki 6469738a1fdSYinghai Lu pci_remove_root_bus(root->bus); 6479738a1fdSYinghai Lu 648864b94adSJiang Liu dmar_device_remove(device->handle); 649864b94adSJiang Liu 6507a3bb55eSRafael J. Wysocki pci_unlock_rescan_remove(); 6517a3bb55eSRafael J. Wysocki 6521da177e4SLinus Torvalds kfree(root); 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6552c204383SJiang Liu /* 6562c204383SJiang Liu * Following code to support acpi_pci_root_create() is copied from 6572c204383SJiang Liu * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 6582c204383SJiang Liu * and ARM64. 6592c204383SJiang Liu */ 6602c204383SJiang Liu static void acpi_pci_root_validate_resources(struct device *dev, 6612c204383SJiang Liu struct list_head *resources, 6622c204383SJiang Liu unsigned long type) 6632c204383SJiang Liu { 6642c204383SJiang Liu LIST_HEAD(list); 6652c204383SJiang Liu struct resource *res1, *res2, *root = NULL; 6662c204383SJiang Liu struct resource_entry *tmp, *entry, *entry2; 6672c204383SJiang Liu 6682c204383SJiang Liu BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); 6692c204383SJiang Liu root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; 6702c204383SJiang Liu 6712c204383SJiang Liu list_splice_init(resources, &list); 6722c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &list) { 6732c204383SJiang Liu bool free = false; 6742c204383SJiang Liu resource_size_t end; 6752c204383SJiang Liu 6762c204383SJiang Liu res1 = entry->res; 6772c204383SJiang Liu if (!(res1->flags & type)) 6782c204383SJiang Liu goto next; 6792c204383SJiang Liu 6802c204383SJiang Liu /* Exclude non-addressable range or non-addressable portion */ 6812c204383SJiang Liu end = min(res1->end, root->end); 6822c204383SJiang Liu if (end <= res1->start) { 6832c204383SJiang Liu dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", 6842c204383SJiang Liu res1); 6852c204383SJiang Liu free = true; 6862c204383SJiang Liu goto next; 6872c204383SJiang Liu } else if (res1->end != end) { 6882c204383SJiang Liu dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", 6892c204383SJiang Liu res1, (unsigned long long)end + 1, 6902c204383SJiang Liu (unsigned long long)res1->end); 6912c204383SJiang Liu res1->end = end; 6922c204383SJiang Liu } 6932c204383SJiang Liu 6942c204383SJiang Liu resource_list_for_each_entry(entry2, resources) { 6952c204383SJiang Liu res2 = entry2->res; 6962c204383SJiang Liu if (!(res2->flags & type)) 6972c204383SJiang Liu continue; 6982c204383SJiang Liu 6992c204383SJiang Liu /* 7002c204383SJiang Liu * I don't like throwing away windows because then 7012c204383SJiang Liu * our resources no longer match the ACPI _CRS, but 7022c204383SJiang Liu * the kernel resource tree doesn't allow overlaps. 7032c204383SJiang Liu */ 7042c204383SJiang Liu if (resource_overlaps(res1, res2)) { 7052c204383SJiang Liu res2->start = min(res1->start, res2->start); 7062c204383SJiang Liu res2->end = max(res1->end, res2->end); 7072c204383SJiang Liu dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", 7082c204383SJiang Liu res2, res1); 7092c204383SJiang Liu free = true; 7102c204383SJiang Liu goto next; 7112c204383SJiang Liu } 7122c204383SJiang Liu } 7132c204383SJiang Liu 7142c204383SJiang Liu next: 7152c204383SJiang Liu resource_list_del(entry); 7162c204383SJiang Liu if (free) 7172c204383SJiang Liu resource_list_free_entry(entry); 7182c204383SJiang Liu else 7192c204383SJiang Liu resource_list_add_tail(entry, resources); 7202c204383SJiang Liu } 7212c204383SJiang Liu } 7222c204383SJiang Liu 7232c204383SJiang Liu int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) 7242c204383SJiang Liu { 7252c204383SJiang Liu int ret; 7262c204383SJiang Liu struct list_head *list = &info->resources; 7272c204383SJiang Liu struct acpi_device *device = info->bridge; 7282c204383SJiang Liu struct resource_entry *entry, *tmp; 7292c204383SJiang Liu unsigned long flags; 7302c204383SJiang Liu 7312c204383SJiang Liu flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; 7322c204383SJiang Liu ret = acpi_dev_get_resources(device, list, 7332c204383SJiang Liu acpi_dev_filter_resource_type_cb, 7342c204383SJiang Liu (void *)flags); 7352c204383SJiang Liu if (ret < 0) 7362c204383SJiang Liu dev_warn(&device->dev, 7372c204383SJiang Liu "failed to parse _CRS method, error code %d\n", ret); 7382c204383SJiang Liu else if (ret == 0) 7392c204383SJiang Liu dev_dbg(&device->dev, 7402c204383SJiang Liu "no IO and memory resources present in _CRS\n"); 7412c204383SJiang Liu else { 7422c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, list) { 7432c204383SJiang Liu if (entry->res->flags & IORESOURCE_DISABLED) 7442c204383SJiang Liu resource_list_destroy_entry(entry); 7452c204383SJiang Liu else 7462c204383SJiang Liu entry->res->name = info->name; 7472c204383SJiang Liu } 7482c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7492c204383SJiang Liu IORESOURCE_MEM); 7502c204383SJiang Liu acpi_pci_root_validate_resources(&device->dev, list, 7512c204383SJiang Liu IORESOURCE_IO); 7522c204383SJiang Liu } 7532c204383SJiang Liu 7542c204383SJiang Liu return ret; 7552c204383SJiang Liu } 7562c204383SJiang Liu 7572c204383SJiang Liu static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) 7582c204383SJiang Liu { 7592c204383SJiang Liu struct resource_entry *entry, *tmp; 7602c204383SJiang Liu struct resource *res, *conflict, *root = NULL; 7612c204383SJiang Liu 7622c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 7632c204383SJiang Liu res = entry->res; 7642c204383SJiang Liu if (res->flags & IORESOURCE_MEM) 7652c204383SJiang Liu root = &iomem_resource; 7662c204383SJiang Liu else if (res->flags & IORESOURCE_IO) 7672c204383SJiang Liu root = &ioport_resource; 7682c204383SJiang Liu else 7692c204383SJiang Liu continue; 7702c204383SJiang Liu 771727ae8beSLiu Jiang /* 772727ae8beSLiu Jiang * Some legacy x86 host bridge drivers use iomem_resource and 773727ae8beSLiu Jiang * ioport_resource as default resource pool, skip it. 774727ae8beSLiu Jiang */ 775727ae8beSLiu Jiang if (res == root) 776727ae8beSLiu Jiang continue; 777727ae8beSLiu Jiang 7782c204383SJiang Liu conflict = insert_resource_conflict(root, res); 7792c204383SJiang Liu if (conflict) { 7802c204383SJiang Liu dev_info(&info->bridge->dev, 7812c204383SJiang Liu "ignoring host bridge window %pR (conflicts with %s %pR)\n", 7822c204383SJiang Liu res, conflict->name, conflict); 7832c204383SJiang Liu resource_list_destroy_entry(entry); 7842c204383SJiang Liu } 7852c204383SJiang Liu } 7862c204383SJiang Liu } 7872c204383SJiang Liu 7882c204383SJiang Liu static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) 7892c204383SJiang Liu { 7902c204383SJiang Liu struct resource *res; 7912c204383SJiang Liu struct resource_entry *entry, *tmp; 7922c204383SJiang Liu 7932c204383SJiang Liu if (!info) 7942c204383SJiang Liu return; 7952c204383SJiang Liu 7962c204383SJiang Liu resource_list_for_each_entry_safe(entry, tmp, &info->resources) { 7972c204383SJiang Liu res = entry->res; 7982c204383SJiang Liu if (res->parent && 7992c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8002c204383SJiang Liu release_resource(res); 8012c204383SJiang Liu resource_list_destroy_entry(entry); 8022c204383SJiang Liu } 8032c204383SJiang Liu 8042c204383SJiang Liu info->ops->release_info(info); 8052c204383SJiang Liu } 8062c204383SJiang Liu 8072c204383SJiang Liu static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) 8082c204383SJiang Liu { 8092c204383SJiang Liu struct resource *res; 8102c204383SJiang Liu struct resource_entry *entry; 8112c204383SJiang Liu 8122c204383SJiang Liu resource_list_for_each_entry(entry, &bridge->windows) { 8132c204383SJiang Liu res = entry->res; 8142c204383SJiang Liu if (res->parent && 8152c204383SJiang Liu (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) 8162c204383SJiang Liu release_resource(res); 8172c204383SJiang Liu } 8182c204383SJiang Liu __acpi_pci_root_release_info(bridge->release_data); 8192c204383SJiang Liu } 8202c204383SJiang Liu 8212c204383SJiang Liu struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, 8222c204383SJiang Liu struct acpi_pci_root_ops *ops, 8232c204383SJiang Liu struct acpi_pci_root_info *info, 8242c204383SJiang Liu void *sysdata) 8252c204383SJiang Liu { 8262c204383SJiang Liu int ret, busnum = root->secondary.start; 8272c204383SJiang Liu struct acpi_device *device = root->device; 8282c204383SJiang Liu int node = acpi_get_node(device->handle); 8292c204383SJiang Liu struct pci_bus *bus; 8302c204383SJiang Liu 8312c204383SJiang Liu info->root = root; 8322c204383SJiang Liu info->bridge = device; 8332c204383SJiang Liu info->ops = ops; 8342c204383SJiang Liu INIT_LIST_HEAD(&info->resources); 8352c204383SJiang Liu snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", 8362c204383SJiang Liu root->segment, busnum); 8372c204383SJiang Liu 8382c204383SJiang Liu if (ops->init_info && ops->init_info(info)) 8392c204383SJiang Liu goto out_release_info; 8402c204383SJiang Liu if (ops->prepare_resources) 8412c204383SJiang Liu ret = ops->prepare_resources(info); 8422c204383SJiang Liu else 8432c204383SJiang Liu ret = acpi_pci_probe_root_resources(info); 8442c204383SJiang Liu if (ret < 0) 8452c204383SJiang Liu goto out_release_info; 8462c204383SJiang Liu 8472c204383SJiang Liu pci_acpi_root_add_resources(info); 8482c204383SJiang Liu pci_add_resource(&info->resources, &root->secondary); 8492c204383SJiang Liu bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, 8502c204383SJiang Liu sysdata, &info->resources); 8512c204383SJiang Liu if (!bus) 8522c204383SJiang Liu goto out_release_info; 8532c204383SJiang Liu 8542c204383SJiang Liu pci_scan_child_bus(bus); 8552c204383SJiang Liu pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge), 8562c204383SJiang Liu acpi_pci_root_release_info, info); 8572c204383SJiang Liu if (node != NUMA_NO_NODE) 8582c204383SJiang Liu dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); 8592c204383SJiang Liu return bus; 8602c204383SJiang Liu 8612c204383SJiang Liu out_release_info: 8622c204383SJiang Liu __acpi_pci_root_release_info(info); 8632c204383SJiang Liu return NULL; 8642c204383SJiang Liu } 8652c204383SJiang Liu 86600c43b96SRafael J. Wysocki void __init acpi_pci_root_init(void) 8671da177e4SLinus Torvalds { 868d3072e6aSRafael J. Wysocki acpi_hest_init(); 8693338db00SRafael J. Wysocki if (acpi_pci_disabled) 8703338db00SRafael J. Wysocki return; 871d3072e6aSRafael J. Wysocki 8727bc5e3f2SBjorn Helgaas pci_acpi_crs_quirks(); 8733338db00SRafael J. Wysocki acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); 874668192b6SYinghai Lu } 875