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 <linux/platform_data/x86/apple.h>
  37 #include <acpi/apei.h>  /* for acpi_hest_init() */
  38
  39 #include "internal.h"
  40
  41 #define _COMPONENT              ACPI_PCI_COMPONENT
  42 ACPI_MODULE_NAME("pci_root");
  43 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  44 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  45 static int acpi_pci_root_add(struct acpi_device *device,
  46                              const struct acpi_device_id *not_used);
  47 static void acpi_pci_root_remove(struct acpi_device *device);
  48
  49 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
  50 {
  51         acpiphp_check_host_bridge(adev);
  52         return 0;
  53 }
  54
  55 #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
  56                                 | OSC_PCI_ASPM_SUPPORT \
  57                                 | OSC_PCI_CLOCK_PM_SUPPORT \
  58                                 | OSC_PCI_MSI_SUPPORT)
  59
  60 static const struct acpi_device_id root_device_ids[] = {
  61         {"PNP0A03", 0},
  62         {"", 0},
  63 };
  64
  65 static struct acpi_scan_handler pci_root_handler = {
  66         .ids = root_device_ids,
  67         .attach = acpi_pci_root_add,
  68         .detach = acpi_pci_root_remove,
  69         .hotplug = {
  70                 .enabled = true,
  71                 .scan_dependent = acpi_pci_root_scan_dependent,
  72         },
  73 };
  74
  75 static DEFINE_MUTEX(osc_lock);
  76
  77 /**
  78  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
  79  * @handle - the ACPI CA node in question.
  80  *
  81  * Note: we could make this API take a struct acpi_device * instead, but
  82  * for now, it's more convenient to operate on an acpi_handle.
  83  */
  84 int acpi_is_root_bridge(acpi_handle handle)
  85 {
  86         int ret;
  87         struct acpi_device *device;
  88
  89         ret = acpi_bus_get_device(handle, &device);
  90         if (ret)
  91                 return 0;
  92
  93         ret = acpi_match_device_ids(device, root_device_ids);
  94         if (ret)
  95                 return 0;
  96         else
  97                 return 1;
  98 }
  99 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 100
 101 static acpi_status
 102 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 103 {
 104         struct resource *res = data;
 105         struct acpi_resource_address64 address;
 106         acpi_status status;
 107
 108         status = acpi_resource_to_address64(resource, &address);
 109         if (ACPI_FAILURE(status))
 110                 return AE_OK;
 111
 112         if ((address.address.address_length > 0) &&
 113             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
 114                 res->start = address.address.minimum;
 115                 res->end = address.address.minimum + address.address.address_length - 1;
 116         }
 117
 118         return AE_OK;
 119 }
 120
 121 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 122                                              struct resource *res)
 123 {
 124         acpi_status status;
 125
 126         res->start = -1;
 127         status =
 128             acpi_walk_resources(handle, METHOD_NAME__CRS,
 129                                 get_root_bridge_busnr_callback, res);
 130         if (ACPI_FAILURE(status))
 131                 return status;
 132         if (res->start == -1)
 133                 return AE_ERROR;
 134         return AE_OK;
 135 }
 136
 137 struct pci_osc_bit_struct {
 138         u32 bit;
 139         char *desc;
 140 };
 141
 142 static struct pci_osc_bit_struct pci_osc_support_bit[] = {
 143         { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
 144         { OSC_PCI_ASPM_SUPPORT, "ASPM" },
 145         { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
 146         { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
 147         { OSC_PCI_MSI_SUPPORT, "MSI" },
 148         { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
 149 };
 150
 151 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
 152         { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
 153         { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
 154         { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
 155         { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
 156         { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
 157         { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" },
 158 };
 159
 160 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
 161                             struct pci_osc_bit_struct *table, int size)
 162 {
 163         char buf[80];
 164         int i, len = 0;
 165         struct pci_osc_bit_struct *entry;
 166
 167         buf[0] = '\0';
 168         for (i = 0, entry = table; i < size; i++, entry++)
 169                 if (word & entry->bit)
 170                         len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
 171                                         len ? " " : "", entry->desc);
 172
 173         dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
 174 }
 175
 176 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
 177 {
 178         decode_osc_bits(root, msg, word, pci_osc_support_bit,
 179                         ARRAY_SIZE(pci_osc_support_bit));
 180 }
 181
 182 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
 183 {
 184         decode_osc_bits(root, msg, word, pci_osc_control_bit,
 185                         ARRAY_SIZE(pci_osc_control_bit));
 186 }
 187
 188 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 189
 190 static acpi_status acpi_pci_run_osc(acpi_handle handle,
 191                                     const u32 *capbuf, u32 *retval)
 192 {
 193         struct acpi_osc_context context = {
 194                 .uuid_str = pci_osc_uuid_str,
 195                 .rev = 1,
 196                 .cap.length = 12,
 197                 .cap.pointer = (void *)capbuf,
 198         };
 199         acpi_status status;
 200
 201         status = acpi_run_osc(handle, &context);
 202         if (ACPI_SUCCESS(status)) {
 203                 *retval = *((u32 *)(context.ret.pointer + 8));
 204                 kfree(context.ret.pointer);
 205         }
 206         return status;
 207 }
 208
 209 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 210                                         u32 support,
 211                                         u32 *control)
 212 {
 213         acpi_status status;
 214         u32 result, capbuf[3];
 215
 216         support &= OSC_PCI_SUPPORT_MASKS;
 217         support |= root->osc_support_set;
 218
 219         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 220         capbuf[OSC_SUPPORT_DWORD] = support;
 221         if (control) {
 222                 *control &= OSC_PCI_CONTROL_MASKS;
 223                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
 224         } else {
 225                 /* Run _OSC query only with existing controls. */
 226                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
 227         }
 228
 229         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 230         if (ACPI_SUCCESS(status)) {
 231                 root->osc_support_set = support;
 232                 if (control)
 233                         *control = result;
 234         }
 235         return status;
 236 }
 237
 238 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 239 {
 240         acpi_status status;
 241
 242         mutex_lock(&osc_lock);
 243         status = acpi_pci_query_osc(root, flags, NULL);
 244         mutex_unlock(&osc_lock);
 245         return status;
 246 }
 247
 248 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 249 {
 250         struct acpi_pci_root *root;
 251         struct acpi_device *device;
 252
 253         if (acpi_bus_get_device(handle, &device) ||
 254             acpi_match_device_ids(device, root_device_ids))
 255                 return NULL;
 256
 257         root = acpi_driver_data(device);
 258
 259         return root;
 260 }
 261 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 262
 263 struct acpi_handle_node {
 264         struct list_head node;
 265         acpi_handle handle;
 266 };
 267
 268 /**
 269  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
 270  * @handle: the handle in question
 271  *
 272  * Given an ACPI CA handle, the desired PCI device is located in the
 273  * list of PCI devices.
 274  *
 275  * If the device is found, its reference count is increased and this
 276  * function returns a pointer to its data structure.  The caller must
 277  * decrement the reference count by calling pci_dev_put().
 278  * If no device is found, %NULL is returned.
 279  */
 280 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
 281 {
 282         int dev, fn;
 283         unsigned long long adr;
 284         acpi_status status;
 285         acpi_handle phandle;
 286         struct pci_bus *pbus;
 287         struct pci_dev *pdev = NULL;
 288         struct acpi_handle_node *node, *tmp;
 289         struct acpi_pci_root *root;
 290         LIST_HEAD(device_list);
 291
 292         /*
 293          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
 294          */
 295         phandle = handle;
 296         while (!acpi_is_root_bridge(phandle)) {
 297                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
 298                 if (!node)
 299                         goto out;
 300
 301                 INIT_LIST_HEAD(&node->node);
 302                 node->handle = phandle;
 303                 list_add(&node->node, &device_list);
 304
 305                 status = acpi_get_parent(phandle, &phandle);
 306                 if (ACPI_FAILURE(status))
 307                         goto out;
 308         }
 309
 310         root = acpi_pci_find_root(phandle);
 311         if (!root)
 312                 goto out;
 313
 314         pbus = root->bus;
 315
 316         /*
 317          * Now, walk back down the PCI device tree until we return to our
 318          * original handle. Assumes that everything between the PCI root
 319          * bridge and the device we're looking for must be a P2P bridge.
 320          */
 321         list_for_each_entry(node, &device_list, node) {
 322                 acpi_handle hnd = node->handle;
 323                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
 324                 if (ACPI_FAILURE(status))
 325                         goto out;
 326                 dev = (adr >> 16) & 0xffff;
 327                 fn  = adr & 0xffff;
 328
 329                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
 330                 if (!pdev || hnd == handle)
 331                         break;
 332
 333                 pbus = pdev->subordinate;
 334                 pci_dev_put(pdev);
 335
 336                 /*
 337                  * This function may be called for a non-PCI device that has a
 338                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
 339                  * case pdev->subordinate will be NULL for the parent.
 340                  */
 341                 if (!pbus) {
 342                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
 343                         pdev = NULL;
 344                         break;
 345                 }
 346         }
 347 out:
 348         list_for_each_entry_safe(node, tmp, &device_list, node)
 349                 kfree(node);
 350
 351         return pdev;
 352 }
 353 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 354
 355 /**
 356  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
 357  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
 358  * @mask: Mask of _OSC bits to request control of, place to store control mask.
 359  * @req: Mask of _OSC bits the control of is essential to the caller.
 360  *
 361  * Run _OSC query for @mask and if that is successful, compare the returned
 362  * mask of control bits with @req.  If all of the @req bits are set in the
 363  * returned mask, run _OSC request for it.
 364  *
 365  * The variable at the @mask address may be modified regardless of whether or
 366  * not the function returns success.  On success it will contain the mask of
 367  * _OSC bits the BIOS has granted control of, but its contents are meaningless
 368  * on failure.
 369  **/
 370 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
 371 {
 372         struct acpi_pci_root *root;
 373         acpi_status status = AE_OK;
 374         u32 ctrl, capbuf[3];
 375
 376         if (!mask)
 377                 return AE_BAD_PARAMETER;
 378
 379         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
 380         if ((ctrl & req) != req)
 381                 return AE_TYPE;
 382
 383         root = acpi_pci_find_root(handle);
 384         if (!root)
 385                 return AE_NOT_EXIST;
 386
 387         mutex_lock(&osc_lock);
 388
 389         *mask = ctrl | root->osc_control_set;
 390         /* No need to evaluate _OSC if the control was already granted. */
 391         if ((root->osc_control_set & ctrl) == ctrl)
 392                 goto out;
 393
 394         /* Need to check the available controls bits before requesting them. */
 395         while (*mask) {
 396                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
 397                 if (ACPI_FAILURE(status))
 398                         goto out;
 399                 if (ctrl == *mask)
 400                         break;
 401                 decode_osc_control(root, "platform does not support",
 402                                    ctrl & ~(*mask));
 403                 ctrl = *mask;
 404         }
 405
 406         if ((ctrl & req) != req) {
 407                 decode_osc_control(root, "not requesting control; platform does not support",
 408                                    req & ~(ctrl));
 409                 status = AE_SUPPORT;
 410                 goto out;
 411         }
 412
 413         capbuf[OSC_QUERY_DWORD] = 0;
 414         capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
 415         capbuf[OSC_CONTROL_DWORD] = ctrl;
 416         status = acpi_pci_run_osc(handle, capbuf, mask);
 417         if (ACPI_SUCCESS(status))
 418                 root->osc_control_set = *mask;
 419 out:
 420         mutex_unlock(&osc_lock);
 421         return status;
 422 }
 423 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 424
 425 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
 426                                  bool is_pcie)
 427 {
 428         u32 support, control, requested;
 429         acpi_status status;
 430         struct acpi_device *device = root->device;
 431         acpi_handle handle = device->handle;
 432
 433         /*
 434          * Apple always return failure on _OSC calls when _OSI("Darwin") has
 435          * been called successfully. We know the feature set supported by the
 436          * platform, so avoid calling _OSC at all
 437          */
 438         if (x86_apple_machine) {
 439                 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
 440                 decode_osc_control(root, "OS assumes control of",
 441                                    root->osc_control_set);
 442                 return;
 443         }
 444
 445         /*
 446          * All supported architectures that use ACPI have support for
 447          * PCI domains, so we indicate this in _OSC support capabilities.
 448          */
 449         support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 450         support |= OSC_PCI_HPX_TYPE_3_SUPPORT;
 451         if (pci_ext_cfg_avail())
 452                 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
 453         if (pcie_aspm_support_enabled())
 454                 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
 455         if (pci_msi_enabled())
 456                 support |= OSC_PCI_MSI_SUPPORT;
 457
 458         decode_osc_support(root, "OS supports", support);
 459         status = acpi_pci_osc_support(root, support);
 460         if (ACPI_FAILURE(status)) {
 461                 *no_aspm = 1;
 462
 463                 /* _OSC is optional for PCI host bridges */
 464                 if ((status == AE_NOT_FOUND) && !is_pcie)
 465                         return;
 466
 467                 dev_info(&device->dev, "_OSC failed (%s)%s\n",
 468                          acpi_format_exception(status),
 469                          pcie_aspm_support_enabled() ? "; disabling ASPM" : "");
 470                 return;
 471         }
 472
 473         if (pcie_ports_disabled) {
 474                 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
 475                 return;
 476         }
 477
 478         if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
 479                 decode_osc_support(root, "not requesting OS control; OS requires",
 480                                    ACPI_PCIE_REQ_SUPPORT);
 481                 return;
 482         }
 483
 484         control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
 485                 | OSC_PCI_EXPRESS_PME_CONTROL;
 486
 487         if (IS_ENABLED(CONFIG_PCIEASPM))
 488                 control |= OSC_PCI_EXPRESS_LTR_CONTROL;
 489
 490         if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
 491                 control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL;
 492
 493         if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
 494                 control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
 495
 496         if (pci_aer_available()) {
 497                 if (aer_acpi_firmware_first())
 498                         dev_info(&device->dev,
 499                                  "PCIe AER handled by firmware\n");
 500                 else
 501                         control |= OSC_PCI_EXPRESS_AER_CONTROL;
 502         }
 503
 504         requested = control;
 505         status = acpi_pci_osc_control_set(handle, &control,
 506                                           OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
 507         if (ACPI_SUCCESS(status)) {
 508                 decode_osc_control(root, "OS now controls", control);
 509                 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
 510                         /*
 511                          * We have ASPM control, but the FADT indicates that
 512                          * it's unsupported. Leave existing configuration
 513                          * intact and prevent the OS from touching it.
 514                          */
 515                         dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
 516                         *no_aspm = 1;
 517                 }
 518         } else {
 519                 decode_osc_control(root, "OS requested", requested);
 520                 decode_osc_control(root, "platform willing to grant", control);
 521                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
 522                         acpi_format_exception(status));
 523
 524                 /*
 525                  * We want to disable ASPM here, but aspm_disabled
 526                  * needs to remain in its state from boot so that we
 527                  * properly handle PCIe 1.1 devices.  So we set this
 528                  * flag here, to defer the action until after the ACPI
 529                  * root scan.
 530                  */
 531                 *no_aspm = 1;
 532         }
 533 }
 534
 535 static int acpi_pci_root_add(struct acpi_device *device,
 536                              const struct acpi_device_id *not_used)
 537 {
 538         unsigned long long segment, bus;
 539         acpi_status status;
 540         int result;
 541         struct acpi_pci_root *root;
 542         acpi_handle handle = device->handle;
 543         int no_aspm = 0;
 544         bool hotadd = system_state == SYSTEM_RUNNING;
 545         bool is_pcie;
 546
 547         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 548         if (!root)
 549                 return -ENOMEM;
 550
 551         segment = 0;
 552         status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
 553                                        &segment);
 554         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 555                 dev_err(&device->dev,  "can't evaluate _SEG\n");
 556                 result = -ENODEV;
 557                 goto end;
 558         }
 559
 560         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 561         root->secondary.flags = IORESOURCE_BUS;
 562         status = try_get_root_bridge_busnr(handle, &root->secondary);
 563         if (ACPI_FAILURE(status)) {
 564                 /*
 565                  * We need both the start and end of the downstream bus range
 566                  * to interpret _CBA (MMCONFIG base address), so it really is
 567                  * supposed to be in _CRS.  If we don't find it there, all we
 568                  * can do is assume [_BBN-0xFF] or [0-0xFF].
 569                  */
 570                 root->secondary.end = 0xFF;
 571                 dev_warn(&device->dev,
 572                          FW_BUG "no secondary bus range in _CRS\n");
 573                 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
 574                                                NULL, &bus);
 575                 if (ACPI_SUCCESS(status))
 576                         root->secondary.start = bus;
 577                 else if (status == AE_NOT_FOUND)
 578                         root->secondary.start = 0;
 579                 else {
 580                         dev_err(&device->dev, "can't evaluate _BBN\n");
 581                         result = -ENODEV;
 582                         goto end;
 583                 }
 584         }
 585
 586         root->device = device;
 587         root->segment = segment & 0xFFFF;
 588         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 589         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 590         device->driver_data = root;
 591
 592         if (hotadd && dmar_device_add(handle)) {
 593                 result = -ENXIO;
 594                 goto end;
 595         }
 596
 597         pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
 598                acpi_device_name(device), acpi_device_bid(device),
 599                root->segment, &root->secondary);
 600
 601         root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
 602
 603         is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0;
 604         negotiate_os_control(root, &no_aspm, is_pcie);
 605
 606         /*
 607          * TBD: Need PCI interface for enumeration/configuration of roots.
 608          */
 609
 610         /*
 611          * Scan the Root Bridge
 612          * --------------------
 613          * Must do this prior to any attempt to bind the root device, as the
 614          * PCI namespace does not get created until this call is made (and
 615          * thus the root bridge's pci_dev does not exist).
 616          */
 617         root->bus = pci_acpi_scan_root(root);
 618         if (!root->bus) {
 619                 dev_err(&device->dev,
 620                         "Bus %04x:%02x not present in PCI namespace\n",
 621                         root->segment, (unsigned int)root->secondary.start);
 622                 device->driver_data = NULL;
 623                 result = -ENODEV;
 624                 goto remove_dmar;
 625         }
 626
 627         if (no_aspm)
 628                 pcie_no_aspm();
 629
 630         pci_acpi_add_bus_pm_notifier(device);
 631         device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid);
 632
 633         if (hotadd) {
 634                 pcibios_resource_survey_bus(root->bus);
 635                 pci_assign_unassigned_root_bus_resources(root->bus);
 636                 /*
 637                  * This is only called for the hotadd case. For the boot-time
 638                  * case, we need to wait until after PCI initialization in
 639                  * order to deal with IOAPICs mapped in on a PCI BAR.
 640                  *
 641                  * This is currently x86-specific, because acpi_ioapic_add()
 642                  * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC.
 643                  * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC
 644                  * (see drivers/acpi/Kconfig).
 645                  */
 646                 acpi_ioapic_add(root->device->handle);
 647         }
 648
 649         pci_lock_rescan_remove();
 650         pci_bus_add_devices(root->bus);
 651         pci_unlock_rescan_remove();
 652         return 1;
 653
 654 remove_dmar:
 655         if (hotadd)
 656                 dmar_device_remove(handle);
 657 end:
 658         kfree(root);
 659         return result;
 660 }
 661
 662 static void acpi_pci_root_remove(struct acpi_device *device)
 663 {
 664         struct acpi_pci_root *root = acpi_driver_data(device);
 665
 666         pci_lock_rescan_remove();
 667
 668         pci_stop_root_bus(root->bus);
 669
 670         pci_ioapic_remove(root);
 671         device_set_wakeup_capable(root->bus->bridge, false);
 672         pci_acpi_remove_bus_pm_notifier(device);
 673
 674         pci_remove_root_bus(root->bus);
 675         WARN_ON(acpi_ioapic_remove(root));
 676
 677         dmar_device_remove(device->handle);
 678
 679         pci_unlock_rescan_remove();
 680
 681         kfree(root);
 682 }
 683
 684 /*
 685  * Following code to support acpi_pci_root_create() is copied from
 686  * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
 687  * and ARM64.
 688  */
 689 static void acpi_pci_root_validate_resources(struct device *dev,
 690                                              struct list_head *resources,
 691                                              unsigned long type)
 692 {
 693         LIST_HEAD(list);
 694         struct resource *res1, *res2, *root = NULL;
 695         struct resource_entry *tmp, *entry, *entry2;
 696
 697         BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
 698         root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
 699
 700         list_splice_init(resources, &list);
 701         resource_list_for_each_entry_safe(entry, tmp, &list) {
 702                 bool free = false;
 703                 resource_size_t end;
 704
 705                 res1 = entry->res;
 706                 if (!(res1->flags & type))
 707                         goto next;
 708
 709                 /* Exclude non-addressable range or non-addressable portion */
 710                 end = min(res1->end, root->end);
 711                 if (end <= res1->start) {
 712                         dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
 713                                  res1);
 714                         free = true;
 715                         goto next;
 716                 } else if (res1->end != end) {
 717                         dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
 718                                  res1, (unsigned long long)end + 1,
 719                                  (unsigned long long)res1->end);
 720                         res1->end = end;
 721                 }
 722
 723                 resource_list_for_each_entry(entry2, resources) {
 724                         res2 = entry2->res;
 725                         if (!(res2->flags & type))
 726                                 continue;
 727
 728                         /*
 729                          * I don't like throwing away windows because then
 730                          * our resources no longer match the ACPI _CRS, but
 731                          * the kernel resource tree doesn't allow overlaps.
 732                          */
 733                         if (resource_overlaps(res1, res2)) {
 734                                 res2->start = min(res1->start, res2->start);
 735                                 res2->end = max(res1->end, res2->end);
 736                                 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
 737                                          res2, res1);
 738                                 free = true;
 739                                 goto next;
 740                         }
 741                 }
 742
 743 next:
 744                 resource_list_del(entry);
 745                 if (free)
 746                         resource_list_free_entry(entry);
 747                 else
 748                         resource_list_add_tail(entry, resources);
 749         }
 750 }
 751
 752 static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode,
 753                         struct resource_entry *entry)
 754 {
 755 #ifdef PCI_IOBASE
 756         struct resource *res = entry->res;
 757         resource_size_t cpu_addr = res->start;
 758         resource_size_t pci_addr = cpu_addr - entry->offset;
 759         resource_size_t length = resource_size(res);
 760         unsigned long port;
 761
 762         if (pci_register_io_range(fwnode, cpu_addr, length))
 763                 goto err;
 764
 765         port = pci_address_to_pio(cpu_addr);
 766         if (port == (unsigned long)-1)
 767                 goto err;
 768
 769         res->start = port;
 770         res->end = port + length - 1;
 771         entry->offset = port - pci_addr;
 772
 773         if (pci_remap_iospace(res, cpu_addr) < 0)
 774                 goto err;
 775
 776         pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
 777         return;
 778 err:
 779         res->flags |= IORESOURCE_DISABLED;
 780 #endif
 781 }
 782
 783 int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
 784 {
 785         int ret;
 786         struct list_head *list = &info->resources;
 787         struct acpi_device *device = info->bridge;
 788         struct resource_entry *entry, *tmp;
 789         unsigned long flags;
 790
 791         flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
 792         ret = acpi_dev_get_resources(device, list,
 793                                      acpi_dev_filter_resource_type_cb,
 794                                      (void *)flags);
 795         if (ret < 0)
 796                 dev_warn(&device->dev,
 797                          "failed to parse _CRS method, error code %d\n", ret);
 798         else if (ret == 0)
 799                 dev_dbg(&device->dev,
 800                         "no IO and memory resources present in _CRS\n");
 801         else {
 802                 resource_list_for_each_entry_safe(entry, tmp, list) {
 803                         if (entry->res->flags & IORESOURCE_IO)
 804                                 acpi_pci_root_remap_iospace(&device->fwnode,
 805                                                 entry);
 806
 807                         if (entry->res->flags & IORESOURCE_DISABLED)
 808                                 resource_list_destroy_entry(entry);
 809                         else
 810                                 entry->res->name = info->name;
 811                 }
 812                 acpi_pci_root_validate_resources(&device->dev, list,
 813                                                  IORESOURCE_MEM);
 814                 acpi_pci_root_validate_resources(&device->dev, list,
 815                                                  IORESOURCE_IO);
 816         }
 817
 818         return ret;
 819 }
 820
 821 static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
 822 {
 823         struct resource_entry *entry, *tmp;
 824         struct resource *res, *conflict, *root = NULL;
 825
 826         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
 827                 res = entry->res;
 828                 if (res->flags & IORESOURCE_MEM)
 829                         root = &iomem_resource;
 830                 else if (res->flags & IORESOURCE_IO)
 831                         root = &ioport_resource;
 832                 else
 833                         continue;
 834
 835                 /*
 836                  * Some legacy x86 host bridge drivers use iomem_resource and
 837                  * ioport_resource as default resource pool, skip it.
 838                  */
 839                 if (res == root)
 840                         continue;
 841
 842                 conflict = insert_resource_conflict(root, res);
 843                 if (conflict) {
 844                         dev_info(&info->bridge->dev,
 845                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 846                                  res, conflict->name, conflict);
 847                         resource_list_destroy_entry(entry);
 848                 }
 849         }
 850 }
 851
 852 static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
 853 {
 854         struct resource *res;
 855         struct resource_entry *entry, *tmp;
 856
 857         if (!info)
 858                 return;
 859
 860         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
 861                 res = entry->res;
 862                 if (res->parent &&
 863                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 864                         release_resource(res);
 865                 resource_list_destroy_entry(entry);
 866         }
 867
 868         info->ops->release_info(info);
 869 }
 870
 871 static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
 872 {
 873         struct resource *res;
 874         struct resource_entry *entry;
 875
 876         resource_list_for_each_entry(entry, &bridge->windows) {
 877                 res = entry->res;
 878                 if (res->flags & IORESOURCE_IO)
 879                         pci_unmap_iospace(res);
 880                 if (res->parent &&
 881                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
 882                         release_resource(res);
 883         }
 884         __acpi_pci_root_release_info(bridge->release_data);
 885 }
 886
 887 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 888                                      struct acpi_pci_root_ops *ops,
 889                                      struct acpi_pci_root_info *info,
 890                                      void *sysdata)
 891 {
 892         int ret, busnum = root->secondary.start;
 893         struct acpi_device *device = root->device;
 894         int node = acpi_get_node(device->handle);
 895         struct pci_bus *bus;
 896         struct pci_host_bridge *host_bridge;
 897
 898         info->root = root;
 899         info->bridge = device;
 900         info->ops = ops;
 901         INIT_LIST_HEAD(&info->resources);
 902         snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
 903                  root->segment, busnum);
 904
 905         if (ops->init_info && ops->init_info(info))
 906                 goto out_release_info;
 907         if (ops->prepare_resources)
 908                 ret = ops->prepare_resources(info);
 909         else
 910                 ret = acpi_pci_probe_root_resources(info);
 911         if (ret < 0)
 912                 goto out_release_info;
 913
 914         pci_acpi_root_add_resources(info);
 915         pci_add_resource(&info->resources, &root->secondary);
 916         bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
 917                                   sysdata, &info->resources);
 918         if (!bus)
 919                 goto out_release_info;
 920
 921         host_bridge = to_pci_host_bridge(bus->bridge);
 922         if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
 923                 host_bridge->native_pcie_hotplug = 0;
 924         if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
 925                 host_bridge->native_shpc_hotplug = 0;
 926         if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
 927                 host_bridge->native_aer = 0;
 928         if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))
 929                 host_bridge->native_pme = 0;
 930         if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
 931                 host_bridge->native_ltr = 0;
 932
 933         pci_scan_child_bus(bus);
 934         pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info,
 935                                     info);
 936         if (node != NUMA_NO_NODE)
 937                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 938         return bus;
 939
 940 out_release_info:
 941         __acpi_pci_root_release_info(info);
 942         return NULL;
 943 }
 944
 945 void __init acpi_pci_root_init(void)
 946 {
 947         acpi_hest_init();
 948         if (acpi_pci_disabled)
 949                 return;
 950
 951         pci_acpi_crs_quirks();
 952         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
 953 }