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  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/pm.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/pci.h>
  34 #include <linux/pci-acpi.h>
  35 #include <linux/pci-aspm.h>
  36 #include <linux/acpi.h>
  37 #include <linux/slab.h>
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40 #include <acpi/apei.h>
  41
  42 #define PREFIX "ACPI: "
  43
  44 #define _COMPONENT              ACPI_PCI_COMPONENT
  45 ACPI_MODULE_NAME("pci_root");
  46 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  47 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  48 static int acpi_pci_root_add(struct acpi_device *device);
  49 static int acpi_pci_root_remove(struct acpi_device *device, int type);
  50 static int acpi_pci_root_start(struct acpi_device *device);
  51
  52 #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
  53                                 | OSC_ACTIVE_STATE_PWR_SUPPORT \
  54                                 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
  55                                 | OSC_MSI_SUPPORT)
  56
  57 static const struct acpi_device_id root_device_ids[] = {
  58         {"PNP0A03", 0},
  59         {"", 0},
  60 };
  61 MODULE_DEVICE_TABLE(acpi, root_device_ids);
  62
  63 static struct acpi_driver acpi_pci_root_driver = {
  64         .name = "pci_root",
  65         .class = ACPI_PCI_ROOT_CLASS,
  66         .ids = root_device_ids,
  67         .ops = {
  68                 .add = acpi_pci_root_add,
  69                 .remove = acpi_pci_root_remove,
  70                 .start = acpi_pci_root_start,
  71                 },
  72 };
  73
  74 static LIST_HEAD(acpi_pci_roots);
  75
  76 static struct acpi_pci_driver *sub_driver;
  77 static DEFINE_MUTEX(osc_lock);
  78
  79 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
  80 {
  81         int n = 0;
  82         struct acpi_pci_root *root;
  83
  84         struct acpi_pci_driver **pptr = &sub_driver;
  85         while (*pptr)
  86                 pptr = &(*pptr)->next;
  87         *pptr = driver;
  88
  89         if (!driver->add)
  90                 return 0;
  91
  92         list_for_each_entry(root, &acpi_pci_roots, node) {
  93                 driver->add(root->device->handle);
  94                 n++;
  95         }
  96
  97         return n;
  98 }
  99
 100 EXPORT_SYMBOL(acpi_pci_register_driver);
 101
 102 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
 103 {
 104         struct acpi_pci_root *root;
 105
 106         struct acpi_pci_driver **pptr = &sub_driver;
 107         while (*pptr) {
 108                 if (*pptr == driver)
 109                         break;
 110                 pptr = &(*pptr)->next;
 111         }
 112         BUG_ON(!*pptr);
 113         *pptr = (*pptr)->next;
 114
 115         if (!driver->remove)
 116                 return;
 117
 118         list_for_each_entry(root, &acpi_pci_roots, node)
 119                 driver->remove(root->device->handle);
 120 }
 121
 122 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 123
 124 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
 125 {
 126         struct acpi_pci_root *root;
 127
 128         list_for_each_entry(root, &acpi_pci_roots, node)
 129                 if ((root->segment == (u16) seg) &&
 130                     (root->secondary.start == (u16) bus))
 131                         return root->device->handle;
 132         return NULL;
 133 }
 134
 135 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
 136
 137 /**
 138  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 139  * @handle - the ACPI CA node in question.
 140  *
 141  * Note: we could make this API take a struct acpi_device * instead, but
 142  * for now, it's more convenient to operate on an acpi_handle.
 143  */
 144 int acpi_is_root_bridge(acpi_handle handle)
 145 {
 146         int ret;
 147         struct acpi_device *device;
 148
 149         ret = acpi_bus_get_device(handle, &device);
 150         if (ret)
 151                 return 0;
 152
 153         ret = acpi_match_device_ids(device, root_device_ids);
 154         if (ret)
 155                 return 0;
 156         else
 157                 return 1;
 158 }
 159 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 160
 161 static acpi_status
 162 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 163 {
 164         struct resource *res = data;
 165         struct acpi_resource_address64 address;
 166
 167         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
 168             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
 169             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
 170                 return AE_OK;
 171
 172         acpi_resource_to_address64(resource, &address);
 173         if ((address.address_length > 0) &&
 174             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
 175                 res->start = address.minimum;
 176                 res->end = address.minimum + address.address_length - 1;
 177         }
 178
 179         return AE_OK;
 180 }
 181
 182 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 183                                              struct resource *res)
 184 {
 185         acpi_status status;
 186
 187         res->start = -1;
 188         status =
 189             acpi_walk_resources(handle, METHOD_NAME__CRS,
 190                                 get_root_bridge_busnr_callback, res);
 191         if (ACPI_FAILURE(status))
 192                 return status;
 193         if (res->start == -1)
 194                 return AE_ERROR;
 195         return AE_OK;
 196 }
 197
 198 static void acpi_pci_bridge_scan(struct acpi_device *device)
 199 {
 200         int status;
 201         struct acpi_device *child = NULL;
 202
 203         if (device->flags.bus_address)
 204                 if (device->parent && device->parent->ops.bind) {
 205                         status = device->parent->ops.bind(device);
 206                         if (!status) {
 207                                 list_for_each_entry(child, &device->children, node)
 208                                         acpi_pci_bridge_scan(child);
 209                         }
 210                 }
 211 }
 212
 213 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 214
 215 static acpi_status acpi_pci_run_osc(acpi_handle handle,
 216                                     const u32 *capbuf, u32 *retval)
 217 {
 218         struct acpi_osc_context context = {
 219                 .uuid_str = pci_osc_uuid_str,
 220                 .rev = 1,
 221                 .cap.length = 12,
 222                 .cap.pointer = (void *)capbuf,
 223         };
 224         acpi_status status;
 225
 226         status = acpi_run_osc(handle, &context);
 227         if (ACPI_SUCCESS(status)) {
 228                 *retval = *((u32 *)(context.ret.pointer + 8));
 229                 kfree(context.ret.pointer);
 230         }
 231         return status;
 232 }
 233
 234 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 235                                         u32 support,
 236                                         u32 *control)
 237 {
 238         acpi_status status;
 239         u32 result, capbuf[3];
 240
 241         support &= OSC_PCI_SUPPORT_MASKS;
 242         support |= root->osc_support_set;
 243
 244         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 245         capbuf[OSC_SUPPORT_TYPE] = support;
 246         if (control) {
 247                 *control &= OSC_PCI_CONTROL_MASKS;
 248                 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
 249         } else {
 250                 /* Run _OSC query for all possible controls. */
 251                 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
 252         }
 253
 254         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 255         if (ACPI_SUCCESS(status)) {
 256                 root->osc_support_set = support;
 257                 if (control)
 258                         *control = result;
 259         }
 260         return status;
 261 }
 262
 263 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 264 {
 265         acpi_status status;
 266         acpi_handle tmp;
 267
 268         status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
 269         if (ACPI_FAILURE(status))
 270                 return status;
 271         mutex_lock(&osc_lock);
 272         status = acpi_pci_query_osc(root, flags, NULL);
 273         mutex_unlock(&osc_lock);
 274         return status;
 275 }
 276
 277 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 278 {
 279         struct acpi_pci_root *root;
 280
 281         list_for_each_entry(root, &acpi_pci_roots, node) {
 282                 if (root->device->handle == handle)
 283                         return root;
 284         }
 285         return NULL;
 286 }
 287 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 288
 289 struct acpi_handle_node {
 290         struct list_head node;
 291         acpi_handle handle;
 292 };
 293
 294 /**
 295  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
 296  * @handle: the handle in question
 297  *
 298  * Given an ACPI CA handle, the desired PCI device is located in the
 299  * list of PCI devices.
 300  *
 301  * If the device is found, its reference count is increased and this
 302  * function returns a pointer to its data structure.  The caller must
 303  * decrement the reference count by calling pci_dev_put().
 304  * If no device is found, %NULL is returned.
 305  */
 306 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
 307 {
 308         int dev, fn;
 309         unsigned long long adr;
 310         acpi_status status;
 311         acpi_handle phandle;
 312         struct pci_bus *pbus;
 313         struct pci_dev *pdev = NULL;
 314         struct acpi_handle_node *node, *tmp;
 315         struct acpi_pci_root *root;
 316         LIST_HEAD(device_list);
 317
 318         /*
 319          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
 320          */
 321         phandle = handle;
 322         while (!acpi_is_root_bridge(phandle)) {
 323                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
 324                 if (!node)
 325                         goto out;
 326
 327                 INIT_LIST_HEAD(&node->node);
 328                 node->handle = phandle;
 329                 list_add(&node->node, &device_list);
 330
 331                 status = acpi_get_parent(phandle, &phandle);
 332                 if (ACPI_FAILURE(status))
 333                         goto out;
 334         }
 335
 336         root = acpi_pci_find_root(phandle);
 337         if (!root)
 338                 goto out;
 339
 340         pbus = root->bus;
 341
 342         /*
 343          * Now, walk back down the PCI device tree until we return to our
 344          * original handle. Assumes that everything between the PCI root
 345          * bridge and the device we're looking for must be a P2P bridge.
 346          */
 347         list_for_each_entry(node, &device_list, node) {
 348                 acpi_handle hnd = node->handle;
 349                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
 350                 if (ACPI_FAILURE(status))
 351                         goto out;
 352                 dev = (adr >> 16) & 0xffff;
 353                 fn  = adr & 0xffff;
 354
 355                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
 356                 if (!pdev || hnd == handle)
 357                         break;
 358
 359                 pbus = pdev->subordinate;
 360                 pci_dev_put(pdev);
 361
 362                 /*
 363                  * This function may be called for a non-PCI device that has a
 364                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
 365                  * case pdev->subordinate will be NULL for the parent.
 366                  */
 367                 if (!pbus) {
 368                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
 369                         pdev = NULL;
 370                         break;
 371                 }
 372         }
 373 out:
 374         list_for_each_entry_safe(node, tmp, &device_list, node)
 375                 kfree(node);
 376
 377         return pdev;
 378 }
 379 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 380
 381 /**
 382  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
 383  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
 384  * @mask: Mask of _OSC bits to request control of, place to store control mask.
 385  * @req: Mask of _OSC bits the control of is essential to the caller.
 386  *
 387  * Run _OSC query for @mask and if that is successful, compare the returned
 388  * mask of control bits with @req.  If all of the @req bits are set in the
 389  * returned mask, run _OSC request for it.
 390  *
 391  * The variable at the @mask address may be modified regardless of whether or
 392  * not the function returns success.  On success it will contain the mask of
 393  * _OSC bits the BIOS has granted control of, but its contents are meaningless
 394  * on failure.
 395  **/
 396 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
 397 {
 398         struct acpi_pci_root *root;
 399         acpi_status status;
 400         u32 ctrl, capbuf[3];
 401         acpi_handle tmp;
 402
 403         if (!mask)
 404                 return AE_BAD_PARAMETER;
 405
 406         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
 407         if ((ctrl & req) != req)
 408                 return AE_TYPE;
 409
 410         root = acpi_pci_find_root(handle);
 411         if (!root)
 412                 return AE_NOT_EXIST;
 413
 414         status = acpi_get_handle(handle, "_OSC", &tmp);
 415         if (ACPI_FAILURE(status))
 416                 return status;
 417
 418         mutex_lock(&osc_lock);
 419
 420         *mask = ctrl | root->osc_control_set;
 421         /* No need to evaluate _OSC if the control was already granted. */
 422         if ((root->osc_control_set & ctrl) == ctrl)
 423                 goto out;
 424
 425         /* Need to check the available controls bits before requesting them. */
 426         while (*mask) {
 427                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
 428                 if (ACPI_FAILURE(status))
 429                         goto out;
 430                 if (ctrl == *mask)
 431                         break;
 432                 ctrl = *mask;
 433         }
 434
 435         if ((ctrl & req) != req) {
 436                 status = AE_SUPPORT;
 437                 goto out;
 438         }
 439
 440         capbuf[OSC_QUERY_TYPE] = 0;
 441         capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
 442         capbuf[OSC_CONTROL_TYPE] = ctrl;
 443         status = acpi_pci_run_osc(handle, capbuf, mask);
 444         if (ACPI_SUCCESS(status))
 445                 root->osc_control_set = *mask;
 446 out:
 447         mutex_unlock(&osc_lock);
 448         return status;
 449 }
 450 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 451
 452 static int __devinit acpi_pci_root_add(struct acpi_device *device)
 453 {
 454         unsigned long long segment, bus;
 455         acpi_status status;
 456         int result;
 457         struct acpi_pci_root *root;
 458         acpi_handle handle;
 459         struct acpi_device *child;
 460         u32 flags, base_flags;
 461
 462         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 463         if (!root)
 464                 return -ENOMEM;
 465
 466         segment = 0;
 467         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 468                                        &segment);
 469         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 470                 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
 471                 result = -ENODEV;
 472                 goto end;
 473         }
 474
 475         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 476         root->secondary.flags = IORESOURCE_BUS;
 477         status = try_get_root_bridge_busnr(device->handle, &root->secondary);
 478         if (ACPI_FAILURE(status)) {
 479                 /*
 480                  * We need both the start and end of the downstream bus range
 481                  * to interpret _CBA (MMCONFIG base address), so it really is
 482                  * supposed to be in _CRS.  If we don't find it there, all we
 483                  * can do is assume [_BBN-0xFF] or [0-0xFF].
 484                  */
 485                 root->secondary.end = 0xFF;
 486                 printk(KERN_WARNING FW_BUG PREFIX
 487                        "no secondary bus range in _CRS\n");
 488                 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
 489                 if (ACPI_SUCCESS(status))
 490                         root->secondary.start = bus;
 491                 else if (status == AE_NOT_FOUND)
 492                         root->secondary.start = 0;
 493                 else {
 494                         printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
 495                         result = -ENODEV;
 496                         goto end;
 497                 }
 498         }
 499
 500         INIT_LIST_HEAD(&root->node);
 501         root->device = device;
 502         root->segment = segment & 0xFFFF;
 503         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 504         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 505         device->driver_data = root;
 506
 507         /*
 508          * All supported architectures that use ACPI have support for
 509          * PCI domains, so we indicate this in _OSC support capabilities.
 510          */
 511         flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 512         acpi_pci_osc_support(root, flags);
 513
 514         /*
 515          * TBD: Need PCI interface for enumeration/configuration of roots.
 516          */
 517
 518         /* TBD: Locking */
 519         list_add_tail(&root->node, &acpi_pci_roots);
 520
 521         printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
 522                acpi_device_name(device), acpi_device_bid(device),
 523                root->segment, &root->secondary);
 524
 525         /*
 526          * Scan the Root Bridge
 527          * --------------------
 528          * Must do this prior to any attempt to bind the root device, as the
 529          * PCI namespace does not get created until this call is made (and
 530          * thus the root bridge's pci_dev does not exist).
 531          */
 532         root->bus = pci_acpi_scan_root(root);
 533         if (!root->bus) {
 534                 printk(KERN_ERR PREFIX
 535                             "Bus %04x:%02x not present in PCI namespace\n",
 536                             root->segment, (unsigned int)root->secondary.start);
 537                 result = -ENODEV;
 538                 goto end;
 539         }
 540
 541         /*
 542          * Attach ACPI-PCI Context
 543          * -----------------------
 544          * Thus binding the ACPI and PCI devices.
 545          */
 546         result = acpi_pci_bind_root(device);
 547         if (result)
 548                 goto end;
 549
 550         /*
 551          * PCI Routing Table
 552          * -----------------
 553          * Evaluate and parse _PRT, if exists.
 554          */
 555         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 556         if (ACPI_SUCCESS(status))
 557                 result = acpi_pci_irq_add_prt(device->handle, root->bus);
 558
 559         /*
 560          * Scan and bind all _ADR-Based Devices
 561          */
 562         list_for_each_entry(child, &device->children, node)
 563                 acpi_pci_bridge_scan(child);
 564
 565         /* Indicate support for various _OSC capabilities. */
 566         if (pci_ext_cfg_avail(root->bus->self))
 567                 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
 568         if (pcie_aspm_support_enabled())
 569                 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
 570                         OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
 571         if (pci_msi_enabled())
 572                 flags |= OSC_MSI_SUPPORT;
 573         if (flags != base_flags)
 574                 acpi_pci_osc_support(root, flags);
 575
 576         if (!pcie_ports_disabled
 577             && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
 578                 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
 579                         | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
 580                         | OSC_PCI_EXPRESS_PME_CONTROL;
 581
 582                 if (pci_aer_available()) {
 583                         if (aer_acpi_firmware_first())
 584                                 dev_dbg(root->bus->bridge,
 585                                         "PCIe errors handled by BIOS.\n");
 586                         else
 587                                 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
 588                 }
 589
 590                 dev_info(root->bus->bridge,
 591                         "Requesting ACPI _OSC control (0x%02x)\n", flags);
 592
 593                 status = acpi_pci_osc_control_set(device->handle, &flags,
 594                                         OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
 595                 if (ACPI_SUCCESS(status)) {
 596                         dev_info(root->bus->bridge,
 597                                 "ACPI _OSC control (0x%02x) granted\n", flags);
 598                 } else {
 599                         dev_dbg(root->bus->bridge,
 600                                 "ACPI _OSC request failed (code %d)\n", status);
 601                         printk(KERN_INFO "Unable to assume _OSC PCIe control. "
 602                                 "Disabling ASPM\n");
 603                         pcie_no_aspm();
 604                 }
 605         }
 606
 607         pci_acpi_add_bus_pm_notifier(device, root->bus);
 608         if (device->wakeup.flags.run_wake)
 609                 device_set_run_wake(root->bus->bridge, true);
 610
 611         return 0;
 612
 613 end:
 614         if (!list_empty(&root->node))
 615                 list_del(&root->node);
 616         kfree(root);
 617         return result;
 618 }
 619
 620 static int acpi_pci_root_start(struct acpi_device *device)
 621 {
 622         struct acpi_pci_root *root = acpi_driver_data(device);
 623
 624         pci_bus_add_devices(root->bus);
 625         return 0;
 626 }
 627
 628 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 629 {
 630         struct acpi_pci_root *root = acpi_driver_data(device);
 631
 632         device_set_run_wake(root->bus->bridge, false);
 633         pci_acpi_remove_bus_pm_notifier(device);
 634
 635         kfree(root);
 636         return 0;
 637 }
 638
 639 static int __init acpi_pci_root_init(void)
 640 {
 641         acpi_hest_init();
 642
 643         if (acpi_pci_disabled)
 644                 return 0;
 645
 646         pci_acpi_crs_quirks();
 647         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 648                 return -ENODEV;
 649
 650         return 0;
 651 }
 652
 653 subsys_initcall(acpi_pci_root_init);