drivers/acpi/pci_root.c

   1 /*
   2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <linux/mutex.h>
  27 #include <linux/pm.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/pci.h>
  30 #include <linux/pci-acpi.h>
  31 #include <linux/pci-aspm.h>
  32 #include <linux/dmar.h>
  33 #include <linux/acpi.h>
  34 #include <linux/slab.h>
  35 #include <linux/dmi.h>
  36 #include <acpi/apei.h>  /* for acpi_hest_init() */
  37
  38 #include "internal.h"
  39
  40 #define _COMPONENT              ACPI_PCI_COMPONENT
  41 ACPI_MODULE_NAME("pci_root");
  42 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  43 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  44 static int acpi_pci_root_add(struct acpi_device *device,
  45                              const struct acpi_device_id *not_used);
  46 static void acpi_pci_root_remove(struct acpi_device *device);
  47
  48 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
  49 {
  50         acpiphp_check_host_bridge(adev);
  51         return 0;
  52 }
  53
  54 #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
  55                                 | OSC_PCI_ASPM_SUPPORT \
  56                                 | OSC_PCI_CLOCK_PM_SUPPORT \
  57                                 | OSC_PCI_MSI_SUPPORT)
  58
  59 static const struct acpi_device_id root_device_ids[] = {
  60         {"PNP0A03", 0},
  61         {"", 0},
  62 };
  63
  64 static struct acpi_scan_handler pci_root_handler = {
  65         .ids = root_device_ids,
  66         .attach = acpi_pci_root_add,
  67         .detach = acpi_pci_root_remove,
  68         .hotplug = {
  69                 .enabled = true,
  70                 .scan_dependent = acpi_pci_root_scan_dependent,
  71         },
  72 };
  73
  74 static DEFINE_MUTEX(osc_lock);
  75
  76 /**
  77  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
  78  * @handle - the ACPI CA node in question.
  79  *
  80  * Note: we could make this API take a struct acpi_device * instead, but
  81  * for now, it's more convenient to operate on an acpi_handle.
  82  */
  83 int acpi_is_root_bridge(acpi_handle handle)
  84 {
  85         int ret;
  86         struct acpi_device *device;
  87
  88         ret = acpi_bus_get_device(handle, &device);
  89         if (ret)
  90                 return 0;
  91
  92         ret = acpi_match_device_ids(device, root_device_ids);
  93         if (ret)
  94                 return 0;
  95         else
  96                 return 1;
  97 }
  98 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
  99
 100 static acpi_status
 101 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 102 {
 103         struct resource *res = data;
 104         struct acpi_resource_address64 address;
 105         acpi_status status;
 106
 107         status = acpi_resource_to_address64(resource, &address);
 108         if (ACPI_FAILURE(status))
 109                 return AE_OK;
 110
 111         if ((address.address.address_length > 0) &&
 112             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
 113                 res->start = address.address.minimum;
 114                 res->end = address.address.minimum + address.address.address_length - 1;
 115         }
 116
 117         return AE_OK;
 118 }
 119
 120 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 121                                              struct resource *res)
 122 {
 123         acpi_status status;
 124
 125         res->start = -1;
 126         status =
 127             acpi_walk_resources(handle, METHOD_NAME__CRS,
 128                                 get_root_bridge_busnr_callback, res);
 129         if (ACPI_FAILURE(status))
 130                 return status;
 131         if (res->start == -1)
 132                 return AE_ERROR;
 133         return AE_OK;
 134 }
 135
 136 struct pci_osc_bit_struct {
 137         u32 bit;
 138         char *desc;
 139 };
 140
 141 static struct pci_osc_bit_struct pci_osc_support_bit[] = {
 142         { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
 143         { OSC_PCI_ASPM_SUPPORT, "ASPM" },
 144         { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
 145         { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
 146         { OSC_PCI_MSI_SUPPORT, "MSI" },
 147 };
 148
 149 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
 150         { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
 151         { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
 152         { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
 153         { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
 154         { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
 155 };
 156
 157 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
 158                             struct pci_osc_bit_struct *table, int size)
 159 {
 160         char buf[80];
 161         int i, len = 0;
 162         struct pci_osc_bit_struct *entry;
 163
 164         buf[0] = '\0';
 165         for (i = 0, entry = table; i < size; i++, entry++)
 166                 if (word & entry->bit)
 167                         len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
 168                                         len ? " " : "", entry->desc);
 169
 170         dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
 171 }
 172
 173 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
 174 {
 175         decode_osc_bits(root, msg, word, pci_osc_support_bit,
 176                         ARRAY_SIZE(pci_osc_support_bit));
 177 }
 178
 179 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
 180 {
 181         decode_osc_bits(root, msg, word, pci_osc_control_bit,
 182                         ARRAY_SIZE(pci_osc_control_bit));
 183 }
 184
 185 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 186
 187 static acpi_status acpi_pci_run_osc(acpi_handle handle,
 188                                     const u32 *capbuf, u32 *retval)
 189 {
 190         struct acpi_osc_context context = {
 191                 .uuid_str = pci_osc_uuid_str,
 192                 .rev = 1,
 193                 .cap.length = 12,
 194                 .cap.pointer = (void *)capbuf,
 195         };
 196         acpi_status status;
 197
 198         status = acpi_run_osc(handle, &context);
 199         if (ACPI_SUCCESS(status)) {
 200                 *retval = *((u32 *)(context.ret.pointer + 8));
 201                 kfree(context.ret.pointer);
 202         }
 203         return status;
 204 }
 205
 206 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 207                                         u32 support,
 208                                         u32 *control)
 209 {
 210         acpi_status status;
 211         u32 result, capbuf[3];
 212
 213         support &= OSC_PCI_SUPPORT_MASKS;
 214         support |= root->osc_support_set;
 215
 216         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 217         capbuf[OSC_SUPPORT_DWORD] = support;
 218         if (control) {
 219                 *control &= OSC_PCI_CONTROL_MASKS;
 220                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
 221         } else {
 222                 /* Run _OSC query only with existing controls. */
 223                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
 224         }
 225
 226         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 227         if (ACPI_SUCCESS(status)) {
 228                 root->osc_support_set = support;
 229                 if (control)
 230                         *control = result;
 231         }
 232         return status;
 233 }
 234
 235 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 236 {
 237         acpi_status status;
 238
 239         mutex_lock(&osc_lock);
 240         status = acpi_pci_query_osc(root, flags, NULL);
 241         mutex_unlock(&osc_lock);
 242         return status;
 243 }
 244
 245 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 246 {
 247         struct acpi_pci_root *root;
 248         struct acpi_device *device;
 249
 250         if (acpi_bus_get_device(handle, &device) ||
 251             acpi_match_device_ids(device, root_device_ids))
 252                 return NULL;
 253
 254         root = acpi_driver_data(device);
 255
 256         return root;
 257 }
 258 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 259
 260 struct acpi_handle_node {
 261         struct list_head node;
 262         acpi_handle handle;
 263 };
 264
 265 /**
 266  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
 267  * @handle: the handle in question
 268  *
 269  * Given an ACPI CA handle, the desired PCI device is located in the
 270  * list of PCI devices.
 271  *
 272  * If the device is found, its reference count is increased and this
 273  * function returns a pointer to its data structure.  The caller must
 274  * decrement the reference count by calling pci_dev_put().
 275  * If no device is found, %NULL is returned.
 276  */
 277 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
 278 {
 279         int dev, fn;
 280         unsigned long long adr;
 281         acpi_status status;
 282         acpi_handle phandle;
 283         struct pci_bus *pbus;
 284         struct pci_dev *pdev = NULL;
 285         struct acpi_handle_node *node, *tmp;
 286         struct acpi_pci_root *root;
 287         LIST_HEAD(device_list);
 288
 289         /*
 290          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
 291          */
 292         phandle = handle;
 293         while (!acpi_is_root_bridge(phandle)) {
 294                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
 295                 if (!node)
 296                         goto out;
 297
 298                 INIT_LIST_HEAD(&node->node);
 299                 node->handle = phandle;
 300                 list_add(&node->node, &device_list);
 301
 302                 status = acpi_get_parent(phandle, &phandle);
 303                 if (ACPI_FAILURE(status))
 304                         goto out;
 305         }
 306
 307         root = acpi_pci_find_root(phandle);
 308         if (!root)
 309                 goto out;
 310
 311         pbus = root->bus;
 312
 313         /*
 314          * Now, walk back down the PCI device tree until we return to our
 315          * original handle. Assumes that everything between the PCI root
 316          * bridge and the device we're looking for must be a P2P bridge.
 317          */
 318         list_for_each_entry(node, &device_list, node) {
 319                 acpi_handle hnd = node->handle;
 320                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
 321                 if (ACPI_FAILURE(status))
 322                         goto out;
 323                 dev = (adr >> 16) & 0xffff;
 324                 fn  = adr & 0xffff;
 325
 326                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
 327                 if (!pdev || hnd == handle)
 328                         break;
 329
 330                 pbus = pdev->subordinate;
 331                 pci_dev_put(pdev);
 332
 333                 /*
 334                  * This function may be called for a non-PCI device that has a
 335                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
 336                  * case pdev->subordinate will be NULL for the parent.
 337                  */
 338                 if (!pbus) {
 339                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
 340                         pdev = NULL;
 341                         break;
 342                 }
 343         }
 344 out:
 345         list_for_each_entry_safe(node, tmp, &device_list, node)
 346                 kfree(node);
 347
 348         return pdev;
 349 }
 350 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 351
 352 /**
 353  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
 354  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
 355  * @mask: Mask of _OSC bits to request control of, place to store control mask.
 356  * @req: Mask of _OSC bits the control of is essential to the caller.
 357  *
 358  * Run _OSC query for @mask and if that is successful, compare the returned
 359  * mask of control bits with @req.  If all of the @req bits are set in the
 360  * returned mask, run _OSC request for it.
 361  *
 362  * The variable at the @mask address may be modified regardless of whether or
 363  * not the function returns success.  On success it will contain the mask of
 364  * _OSC bits the BIOS has granted control of, but its contents are meaningless
 365  * on failure.
 366  **/
 367 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
 368 {
 369         struct acpi_pci_root *root;
 370         acpi_status status = AE_OK;
 371         u32 ctrl, capbuf[3];
 372
 373         if (!mask)
 374                 return AE_BAD_PARAMETER;
 375
 376         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
 377         if ((ctrl & req) != req)
 378                 return AE_TYPE;
 379
 380         root = acpi_pci_find_root(handle);
 381         if (!root)
 382                 return AE_NOT_EXIST;
 383
 384         mutex_lock(&osc_lock);
 385
 386         *mask = ctrl | root->osc_control_set;
 387         /* No need to evaluate _OSC if the control was already granted. */
 388         if ((root->osc_control_set & ctrl) == ctrl)
 389                 goto out;
 390
 391         /* Need to check the available controls bits before requesting them. */
 392         while (*mask) {
 393                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
 394                 if (ACPI_FAILURE(status))
 395                         goto out;
 396                 if (ctrl == *mask)
 397                         break;
 398                 decode_osc_control(root, "platform does not support",
 399                                    ctrl & ~(*mask));
 400                 ctrl = *mask;
 401         }
 402
 403         if ((ctrl & req) != req) {
 404                 decode_osc_control(root, "not requesting control; platform does not support",
 405                                    req & ~(ctrl));
 406                 status = AE_SUPPORT;
 407                 goto out;
 408         }
 409
 410         capbuf[OSC_QUERY_DWORD] = 0;
 411         capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
 412         capbuf[OSC_CONTROL_DWORD] = ctrl;
 413         status = acpi_pci_run_osc(handle, capbuf, mask);
 414         if (ACPI_SUCCESS(status))
 415                 root->osc_control_set = *mask;
 416 out:
 417         mutex_unlock(&osc_lock);
 418         return status;
 419 }
 420 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 421
 422 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
 423 {
 424         u32 support, control, requested;
 425         acpi_status status;
 426         struct acpi_device *device = root->device;
 427         acpi_handle handle = device->handle;
 428
 429         /*
 430          * Apple always return failure on _OSC calls when _OSI("Darwin") has
 431          * been called successfully. We know the feature set supported by the
 432          * platform, so avoid calling _OSC at all
 433          */
 434
 435         if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
 436                 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
 437                 decode_osc_control(root, "OS assumes control of",
 438                                    root->osc_control_set);
 439                 return;
 440         }
 441
 442         /*
 443          * All supported architectures that use ACPI have support for
 444          * PCI domains, so we indicate this in _OSC support capabilities.
 445          */
 446         support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 447         if (pci_ext_cfg_avail())
 448                 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
 449         if (pcie_aspm_support_enabled())
 450                 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
 451         if (pci_msi_enabled())
 452                 support |= OSC_PCI_MSI_SUPPORT;
 453
 454         decode_osc_support(root, "OS supports", support);
 455         status = acpi_pci_osc_support(root, support);
 456         if (ACPI_FAILURE(status)) {
 457                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
 458                          acpi_format_exception(status));
 459                 *no_aspm = 1;
 460                 return;
 461         }
 462
 463         if (pcie_ports_disabled) {
 464                 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
 465                 return;
 466         }
 467
 468         if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
 469                 decode_osc_support(root, "not requesting OS control; OS requires",
 470                                    ACPI_PCIE_REQ_SUPPORT);
 471                 return;
 472         }
 473
 474         control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
 475                 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
 476                 | OSC_PCI_EXPRESS_PME_CONTROL;
 477
 478         if (pci_aer_available()) {
 479                 if (aer_acpi_firmware_first())
 480                         dev_info(&device->dev,
 481                                  "PCIe AER handled by firmware\n");
 482                 else
 483                         control |= OSC_PCI_EXPRESS_AER_CONTROL;
 484         }
 485
 486         requested = control;
 487         status = acpi_pci_osc_control_set(handle, &control,
 488                                           OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
 489         if (ACPI_SUCCESS(status)) {
 490                 decode_osc_control(root, "OS now controls", control);
 491                 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
 492                         /*
 493                          * We have ASPM control, but the FADT indicates that
 494                          * it's unsupported. Leave existing configuration
 495                          * intact and prevent the OS from touching it.
 496                          */
 497                         dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
 498                         *no_aspm = 1;
 499                 }
 500         } else {
 501                 decode_osc_control(root, "OS requested", requested);
 502                 decode_osc_control(root, "platform willing to grant", control);
 503                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
 504                         acpi_format_exception(status));
 505
 506                 /*
 507                  * We want to disable ASPM here, but aspm_disabled
 508                  * needs to remain in its state from boot so that we
 509                  * properly handle PCIe 1.1 devices.  So we set this
 510                  * flag here, to defer the action until after the ACPI
 511                  * root scan.
 512                  */
 513                 *no_aspm = 1;
 514         }
 515 }
 516
 517 static int acpi_pci_root_add(struct acpi_device *device,
 518                              const struct acpi_device_id *not_used)
 519 {
 520         unsigned long long segment, bus;
 521         acpi_status status;
 522         int result;
 523         struct acpi_pci_root *root;
 524         acpi_handle handle = device->handle;
 525         int no_aspm = 0;
 526         bool hotadd = system_state != SYSTEM_BOOTING;
 527
 528         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 529         if (!root)
 530                 return -ENOMEM;
 531
 532         segment = 0;
 533         status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
 534                                        &segment);
 535         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 536                 dev_err(&device->dev,  "can't evaluate _SEG\n");
 537                 result = -ENODEV;
 538                 goto end;
 539         }
 540
 541         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 542         root->secondary.flags = IORESOURCE_BUS;
 543         status = try_get_root_bridge_busnr(handle, &root->secondary);
 544         if (ACPI_FAILURE(status)) {
 545                 /*
 546                  * We need both the start and end of the downstream bus range
 547                  * to interpret _CBA (MMCONFIG base address), so it really is
 548                  * supposed to be in _CRS.  If we don't find it there, all we
 549                  * can do is assume [_BBN-0xFF] or [0-0xFF].
 550                  */
 551                 root->secondary.end = 0xFF;
 552                 dev_warn(&device->dev,
 553                          FW_BUG "no secondary bus range in _CRS\n");
 554                 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
 555                                                NULL, &bus);
 556                 if (ACPI_SUCCESS(status))
 557                         root->secondary.start = bus;
 558                 else if (status == AE_NOT_FOUND)
 559                         root->secondary.start = 0;
 560                 else {
 561                         dev_err(&device->dev, "can't evaluate _BBN\n");
 562                         result = -ENODEV;
 563                         goto end;
 564                 }
 565         }
 566
 567         root->device = device;
 568         root->segment = segment & 0xFFFF;
 569         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 570         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 571         device->driver_data = root;
 572
 573         if (hotadd && dmar_device_add(handle)) {
 574                 result = -ENXIO;
 575                 goto end;
 576         }
 577
 578         pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
 579                acpi_device_name(device), acpi_device_bid(device),
 580                root->segment, &root->secondary);
 581
 582         root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
 583
 584         negotiate_os_control(root, &no_aspm);
 585
 586         /*
 587          * TBD: Need PCI interface for enumeration/configuration of roots.
 588          */
 589
 590         /*
 591          * Scan the Root Bridge
 592          * --------------------
 593          * Must do this prior to any attempt to bind the root device, as the
 594          * PCI namespace does not get created until this call is made (and
 595          * thus the root bridge's pci_dev does not exist).
 596          */
 597         root->bus = pci_acpi_scan_root(root);
 598         if (!root->bus) {
 599                 dev_err(&device->dev,
 600                         "Bus %04x:%02x not present in PCI namespace\n",
 601                         root->segment, (unsigned int)root->secondary.start);
 602                 device->driver_data = NULL;
 603                 result = -ENODEV;
 604                 goto remove_dmar;
 605         }
 606
 607         if (no_aspm)
 608                 pcie_no_aspm();
 609
 610         pci_acpi_add_bus_pm_notifier(device);
 611         if (device->wakeup.flags.run_wake)
 612                 device_set_run_wake(root->bus->bridge, true);
 613
 614         if (hotadd) {
 615                 pcibios_resource_survey_bus(root->bus);
 616                 pci_assign_unassigned_root_bus_resources(root->bus);
 617                 /*
 618                  * This is only called for the hotadd case. For the boot-time
 619                  * case, we need to wait until after PCI initialization in
 620                  * order to deal with IOAPICs mapped in on a PCI BAR.
 621                  *
 622                  * This is currently x86-specific, because acpi_ioapic_add()
 623                  * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC.
 624                  * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC
 625                  * (see drivers/acpi/Kconfig).
 626                  */
 627                 acpi_ioapic_add(root->device->handle);
 628         }
 629
 630         pci_lock_rescan_remove();
 631         pci_bus_add_devices(root->bus);
 632         pci_unlock_rescan_remove();
 633         return 1;
 634
 635 remove_dmar:
 636         if (hotadd)
 637                 dmar_device_remove(handle);
 638 end:
 639         kfree(root);
 640         return result;
 641 }
 642
 643 static void acpi_pci_root_remove(struct acpi_device *device)
 644 {
 645         struct acpi_pci_root *root = acpi_driver_data(device);
 646
 647         pci_lock_rescan_remove();
 648
 649         pci_stop_root_bus(root->bus);
 650
 651         pci_ioapic_remove(root);
 652         device_set_run_wake(root->bus->bridge, false);
 653         pci_acpi_remove_bus_pm_notifier(device);
 654
 655         pci_remove_root_bus(root->bus);
 656         WARN_ON(acpi_ioapic_remove(root));
 657
 658         dmar_device_remove(device->handle);
 659
 660         pci_unlock_rescan_remove();
 661
 662         kfree(root);
 663 }
 664
 665 /*
 666  * Following code to support acpi_pci_root_create() is copied from
 667  * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
 668  * and ARM64.
 669  */
 670 static void acpi_pci_root_validate_resources(struct device *dev,
 671                                              struct list_head *resources,
 672                                              unsigned long type)
 673 {
 674         LIST_HEAD(list);
 675         struct resource *res1, *res2, *root = NULL;
 676         struct resource_entry *tmp, *entry, *entry2;
 677
 678         BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
 679         root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
 680
 681         list_splice_init(resources, &list);
 682         resource_list_for_each_entry_safe(entry, tmp, &list) {
 683                 bool free = false;
 684                 resource_size_t end;
 685
 686                 res1 = entry->res;
 687                 if (!(res1->flags & type))
 688                         goto next;
 689
 690                 /* Exclude non-addressable range or non-addressable portion */
 691                 end = min(res1->end, root->end);
 692                 if (end <= res1->start) {
 693                         dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
 694                                  res1);
 695                         free = true;
 696                         goto next;
 697                 } else if (res1->end != end) {
 698                         dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
 699                                  res1, (unsigned long long)end + 1,
 700                                  (unsigned long long)res1->end);
 701                         res1->end = end;
 702                 }
 703
 704                 resource_list_for_each_entry(entry2, resources) {
 705                         res2 = entry2->res;
 706                         if (!(res2->flags & type))
 707                                 continue;
 708
 709                         /*
 710                          * I don't like throwing away windows because then
 711                          * our resources no longer match the ACPI _CRS, but
 712                          * the kernel resource tree doesn't allow overlaps.
 713                          */
 714                         if (resource_overlaps(res1, res2)) {
 715                                 res2->start = min(res1->start, res2->start);
 716                                 res2->end = max(res1->end, res2->end);
 717                                 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
 718                                          res2, res1);
 719                                 free = true;
 720                                 goto next;
 721                         }
 722                 }
 723
 724 next:
 725                 resource_list_del(entry);
 726                 if (free)
 727                         resource_list_free_entry(entry);
 728                 else
 729                         resource_list_add_tail(entry, resources);
 730         }
 731 }
 732
 733 static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
 734 {
 735 #ifdef PCI_IOBASE
 736         struct resource *res = entry->res;
 737         resource_size_t cpu_addr = res->start;
 738         resource_size_t pci_addr = cpu_addr - entry->offset;
 739         resource_size_t length = resource_size(res);
 740         unsigned long port;
 741
 742         if (pci_register_io_range(cpu_addr, length))
 743                 goto err;
 744
 745         port = pci_address_to_pio(cpu_addr);
 746         if (port == (unsigned long)-1)
 747                 goto err;
 748
 749         res->start = port;
 750         res->end = port + length - 1;
 751         entry->offset = port - pci_addr;
 752
 753         if (pci_remap_iospace(res, cpu_addr) < 0)
 754                 goto err;
 755
 756         pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
 757         return;
 758 err:
 759         res->flags |= IORESOURCE_DISABLED;
 760 #endif
 761 }
 762
 763 int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
 764 {
 765         int ret;
 766         struct list_head *list = &info->resources;
 767         struct acpi_device *device = info->bridge;
 768         struct resource_entry *entry, *tmp;
 769         unsigned long flags;
 770
 771         flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
 772         ret = acpi_dev_get_resources(device, list,
 773                                      acpi_dev_filter_resource_type_cb,
 774                                      (void *)flags);
 775         if (ret < 0)
 776                 dev_warn(&device->dev,
 777                          "failed to parse _CRS method, error code %d\n", ret);
 778         else if (ret == 0)
 779                 dev_dbg(&device->dev,
 780                         "no IO and memory resources present in _CRS\n");
 781         else {
 782                 resource_list_for_each_entry_safe(entry, tmp, list) {
 783                         if (entry->res->flags & IORESOURCE_IO)
 784                                 acpi_pci_root_remap_iospace(entry);
 785
 786                         if (entry->res->flags & IORESOURCE_DISABLED)
 787                                 resource_list_destroy_entry(entry);
 788                         else
 789                                 entry->res->name = info->name;
 790                 }
 791                 acpi_pci_root_validate_resources(&device->dev, list,
 792                                                  IORESOURCE_MEM);
 793                 acpi_pci_root_validate_resources(&device->dev, list,
 794                                                  IORESOURCE_IO);
 795         }
 796
 797         return ret;
 798 }
 799
 800 static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
 801 {
 802         struct resource_entry *entry, *tmp;
 803         struct resource *res, *conflict, *root = NULL;
 804
 805         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
 806                 res = entry->res;
 807                 if (res->flags & IORESOURCE_MEM)
 808                         root = &iomem_resource;
 809                 else if (res->flags & IORESOURCE_IO)
 810                         root = &ioport_resource;
 811                 else
 812                         continue;
 813
 814                 /*
 815                  * Some legacy x86 host bridge drivers use iomem_resource and
 816                  * ioport_resource as default resource pool, skip it.
 817                  */
 818                 if (res == root)
 819                         continue;
 820
 821                 conflict = insert_resource_conflict(root, res);
 822                 if (conflict) {
 823                         dev_info(&info->bridge->dev,
 824                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 825                                  res, conflict->name, conflict);
 826                         resource_list_destroy_entry(entry);
 827                 }
 828         }
 829 }
 830
 831 static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
 832 {
 833         struct resource *res;
 834         struct resource_entry *entry, *tmp;
 835
 836         if (!info)
 837                 return;
 838
 839         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
 840                 res = entry->res;
 841                 if (res->parent &&
 842                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 843                         release_resource(res);
 844                 resource_list_destroy_entry(entry);
 845         }
 846
 847         info->ops->release_info(info);
 848 }
 849
 850 static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
 851 {
 852         struct resource *res;
 853         struct resource_entry *entry;
 854
 855         resource_list_for_each_entry(entry, &bridge->windows) {
 856                 res = entry->res;
 857                 if (res->flags & IORESOURCE_IO)
 858                         pci_unmap_iospace(res);
 859                 if (res->parent &&
 860                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 861                         release_resource(res);
 862         }
 863         __acpi_pci_root_release_info(bridge->release_data);
 864 }
 865
 866 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 867                                      struct acpi_pci_root_ops *ops,
 868                                      struct acpi_pci_root_info *info,
 869                                      void *sysdata)
 870 {
 871         int ret, busnum = root->secondary.start;
 872         struct acpi_device *device = root->device;
 873         int node = acpi_get_node(device->handle);
 874         struct pci_bus *bus;
 875
 876         info->root = root;
 877         info->bridge = device;
 878         info->ops = ops;
 879         INIT_LIST_HEAD(&info->resources);
 880         snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
 881                  root->segment, busnum);
 882
 883         if (ops->init_info && ops->init_info(info))
 884                 goto out_release_info;
 885         if (ops->prepare_resources)
 886                 ret = ops->prepare_resources(info);
 887         else
 888                 ret = acpi_pci_probe_root_resources(info);
 889         if (ret < 0)
 890                 goto out_release_info;
 891
 892         pci_acpi_root_add_resources(info);
 893         pci_add_resource(&info->resources, &root->secondary);
 894         bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
 895                                   sysdata, &info->resources);
 896         if (!bus)
 897                 goto out_release_info;
 898
 899         pci_scan_child_bus(bus);
 900         pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
 901                                     acpi_pci_root_release_info, info);
 902         if (node != NUMA_NO_NODE)
 903                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 904         return bus;
 905
 906 out_release_info:
 907         __acpi_pci_root_release_info(info);
 908         return NULL;
 909 }
 910
 911 void __init acpi_pci_root_init(void)
 912 {
 913         acpi_hest_init();
 914         if (acpi_pci_disabled)
 915                 return;
 916
 917         pci_acpi_crs_quirks();
 918         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
 919 }