linux/drivers/acpi/pci_root.c
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   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/mutex.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
  45ACPI_MODULE_NAME("pci_root");
  46#define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  47#define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  48static int acpi_pci_root_add(struct acpi_device *device);
  49static int acpi_pci_root_remove(struct acpi_device *device, int type);
  50static 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
  57static const struct acpi_device_id root_device_ids[] = {
  58        {"PNP0A03", 0},
  59        {"", 0},
  60};
  61MODULE_DEVICE_TABLE(acpi, root_device_ids);
  62
  63static 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/* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */
  75static DEFINE_MUTEX(acpi_pci_root_lock);
  76static LIST_HEAD(acpi_pci_roots);
  77static LIST_HEAD(acpi_pci_drivers);
  78
  79static DEFINE_MUTEX(osc_lock);
  80
  81int acpi_pci_register_driver(struct acpi_pci_driver *driver)
  82{
  83        int n = 0;
  84        struct acpi_pci_root *root;
  85
  86        mutex_lock(&acpi_pci_root_lock);
  87        list_add_tail(&driver->node, &acpi_pci_drivers);
  88        if (driver->add)
  89                list_for_each_entry(root, &acpi_pci_roots, node) {
  90                        driver->add(root);
  91                        n++;
  92                }
  93        mutex_unlock(&acpi_pci_root_lock);
  94
  95        return n;
  96}
  97EXPORT_SYMBOL(acpi_pci_register_driver);
  98
  99void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
 100{
 101        struct acpi_pci_root *root;
 102
 103        mutex_lock(&acpi_pci_root_lock);
 104        list_del(&driver->node);
 105        if (driver->remove)
 106                list_for_each_entry(root, &acpi_pci_roots, node)
 107                        driver->remove(root);
 108        mutex_unlock(&acpi_pci_root_lock);
 109}
 110EXPORT_SYMBOL(acpi_pci_unregister_driver);
 111
 112acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
 113{
 114        struct acpi_pci_root *root;
 115        acpi_handle handle = NULL;
 116        
 117        mutex_lock(&acpi_pci_root_lock);
 118        list_for_each_entry(root, &acpi_pci_roots, node)
 119                if ((root->segment == (u16) seg) &&
 120                    (root->secondary.start == (u16) bus)) {
 121                        handle = root->device->handle;
 122                        break;
 123                }
 124        mutex_unlock(&acpi_pci_root_lock);
 125        return handle;
 126}
 127
 128EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
 129
 130/**
 131 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 132 * @handle - the ACPI CA node in question.
 133 *
 134 * Note: we could make this API take a struct acpi_device * instead, but
 135 * for now, it's more convenient to operate on an acpi_handle.
 136 */
 137int acpi_is_root_bridge(acpi_handle handle)
 138{
 139        int ret;
 140        struct acpi_device *device;
 141
 142        ret = acpi_bus_get_device(handle, &device);
 143        if (ret)
 144                return 0;
 145
 146        ret = acpi_match_device_ids(device, root_device_ids);
 147        if (ret)
 148                return 0;
 149        else
 150                return 1;
 151}
 152EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 153
 154static acpi_status
 155get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 156{
 157        struct resource *res = data;
 158        struct acpi_resource_address64 address;
 159
 160        if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
 161            resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
 162            resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
 163                return AE_OK;
 164
 165        acpi_resource_to_address64(resource, &address);
 166        if ((address.address_length > 0) &&
 167            (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
 168                res->start = address.minimum;
 169                res->end = address.minimum + address.address_length - 1;
 170        }
 171
 172        return AE_OK;
 173}
 174
 175static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 176                                             struct resource *res)
 177{
 178        acpi_status status;
 179
 180        res->start = -1;
 181        status =
 182            acpi_walk_resources(handle, METHOD_NAME__CRS,
 183                                get_root_bridge_busnr_callback, res);
 184        if (ACPI_FAILURE(status))
 185                return status;
 186        if (res->start == -1)
 187                return AE_ERROR;
 188        return AE_OK;
 189}
 190
 191static void acpi_pci_bridge_scan(struct acpi_device *device)
 192{
 193        int status;
 194        struct acpi_device *child = NULL;
 195
 196        if (device->flags.bus_address)
 197                if (device->parent && device->parent->ops.bind) {
 198                        status = device->parent->ops.bind(device);
 199                        if (!status) {
 200                                list_for_each_entry(child, &device->children, node)
 201                                        acpi_pci_bridge_scan(child);
 202                        }
 203                }
 204}
 205
 206static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 207
 208static acpi_status acpi_pci_run_osc(acpi_handle handle,
 209                                    const u32 *capbuf, u32 *retval)
 210{
 211        struct acpi_osc_context context = {
 212                .uuid_str = pci_osc_uuid_str,
 213                .rev = 1,
 214                .cap.length = 12,
 215                .cap.pointer = (void *)capbuf,
 216        };
 217        acpi_status status;
 218
 219        status = acpi_run_osc(handle, &context);
 220        if (ACPI_SUCCESS(status)) {
 221                *retval = *((u32 *)(context.ret.pointer + 8));
 222                kfree(context.ret.pointer);
 223        }
 224        return status;
 225}
 226
 227static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 228                                        u32 support,
 229                                        u32 *control)
 230{
 231        acpi_status status;
 232        u32 result, capbuf[3];
 233
 234        support &= OSC_PCI_SUPPORT_MASKS;
 235        support |= root->osc_support_set;
 236
 237        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 238        capbuf[OSC_SUPPORT_TYPE] = support;
 239        if (control) {
 240                *control &= OSC_PCI_CONTROL_MASKS;
 241                capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
 242        } else {
 243                /* Run _OSC query for all possible controls. */
 244                capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
 245        }
 246
 247        status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 248        if (ACPI_SUCCESS(status)) {
 249                root->osc_support_set = support;
 250                if (control)
 251                        *control = result;
 252        }
 253        return status;
 254}
 255
 256static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 257{
 258        acpi_status status;
 259        acpi_handle tmp;
 260
 261        status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
 262        if (ACPI_FAILURE(status))
 263                return status;
 264        mutex_lock(&osc_lock);
 265        status = acpi_pci_query_osc(root, flags, NULL);
 266        mutex_unlock(&osc_lock);
 267        return status;
 268}
 269
 270struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 271{
 272        struct acpi_pci_root *root;
 273        struct acpi_device *device;
 274
 275        if (acpi_bus_get_device(handle, &device) ||
 276            acpi_match_device_ids(device, root_device_ids))
 277                return NULL;
 278
 279        root = acpi_driver_data(device);
 280
 281        return root;
 282}
 283EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 284
 285struct acpi_handle_node {
 286        struct list_head node;
 287        acpi_handle handle;
 288};
 289
 290/**
 291 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
 292 * @handle: the handle in question
 293 *
 294 * Given an ACPI CA handle, the desired PCI device is located in the
 295 * list of PCI devices.
 296 *
 297 * If the device is found, its reference count is increased and this
 298 * function returns a pointer to its data structure.  The caller must
 299 * decrement the reference count by calling pci_dev_put().
 300 * If no device is found, %NULL is returned.
 301 */
 302struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
 303{
 304        int dev, fn;
 305        unsigned long long adr;
 306        acpi_status status;
 307        acpi_handle phandle;
 308        struct pci_bus *pbus;
 309        struct pci_dev *pdev = NULL;
 310        struct acpi_handle_node *node, *tmp;
 311        struct acpi_pci_root *root;
 312        LIST_HEAD(device_list);
 313
 314        /*
 315         * Walk up the ACPI CA namespace until we reach a PCI root bridge.
 316         */
 317        phandle = handle;
 318        while (!acpi_is_root_bridge(phandle)) {
 319                node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
 320                if (!node)
 321                        goto out;
 322
 323                INIT_LIST_HEAD(&node->node);
 324                node->handle = phandle;
 325                list_add(&node->node, &device_list);
 326
 327                status = acpi_get_parent(phandle, &phandle);
 328                if (ACPI_FAILURE(status))
 329                        goto out;
 330        }
 331
 332        root = acpi_pci_find_root(phandle);
 333        if (!root)
 334                goto out;
 335
 336        pbus = root->bus;
 337
 338        /*
 339         * Now, walk back down the PCI device tree until we return to our
 340         * original handle. Assumes that everything between the PCI root
 341         * bridge and the device we're looking for must be a P2P bridge.
 342         */
 343        list_for_each_entry(node, &device_list, node) {
 344                acpi_handle hnd = node->handle;
 345                status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
 346                if (ACPI_FAILURE(status))
 347                        goto out;
 348                dev = (adr >> 16) & 0xffff;
 349                fn  = adr & 0xffff;
 350
 351                pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
 352                if (!pdev || hnd == handle)
 353                        break;
 354
 355                pbus = pdev->subordinate;
 356                pci_dev_put(pdev);
 357
 358                /*
 359                 * This function may be called for a non-PCI device that has a
 360                 * PCI parent (eg. a disk under a PCI SATA controller).  In that
 361                 * case pdev->subordinate will be NULL for the parent.
 362                 */
 363                if (!pbus) {
 364                        dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
 365                        pdev = NULL;
 366                        break;
 367                }
 368        }
 369out:
 370        list_for_each_entry_safe(node, tmp, &device_list, node)
 371                kfree(node);
 372
 373        return pdev;
 374}
 375EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 376
 377/**
 378 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
 379 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
 380 * @mask: Mask of _OSC bits to request control of, place to store control mask.
 381 * @req: Mask of _OSC bits the control of is essential to the caller.
 382 *
 383 * Run _OSC query for @mask and if that is successful, compare the returned
 384 * mask of control bits with @req.  If all of the @req bits are set in the
 385 * returned mask, run _OSC request for it.
 386 *
 387 * The variable at the @mask address may be modified regardless of whether or
 388 * not the function returns success.  On success it will contain the mask of
 389 * _OSC bits the BIOS has granted control of, but its contents are meaningless
 390 * on failure.
 391 **/
 392acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
 393{
 394        struct acpi_pci_root *root;
 395        acpi_status status;
 396        u32 ctrl, capbuf[3];
 397        acpi_handle tmp;
 398
 399        if (!mask)
 400                return AE_BAD_PARAMETER;
 401
 402        ctrl = *mask & OSC_PCI_CONTROL_MASKS;
 403        if ((ctrl & req) != req)
 404                return AE_TYPE;
 405
 406        root = acpi_pci_find_root(handle);
 407        if (!root)
 408                return AE_NOT_EXIST;
 409
 410        status = acpi_get_handle(handle, "_OSC", &tmp);
 411        if (ACPI_FAILURE(status))
 412                return status;
 413
 414        mutex_lock(&osc_lock);
 415
 416        *mask = ctrl | root->osc_control_set;
 417        /* No need to evaluate _OSC if the control was already granted. */
 418        if ((root->osc_control_set & ctrl) == ctrl)
 419                goto out;
 420
 421        /* Need to check the available controls bits before requesting them. */
 422        while (*mask) {
 423                status = acpi_pci_query_osc(root, root->osc_support_set, mask);
 424                if (ACPI_FAILURE(status))
 425                        goto out;
 426                if (ctrl == *mask)
 427                        break;
 428                ctrl = *mask;
 429        }
 430
 431        if ((ctrl & req) != req) {
 432                status = AE_SUPPORT;
 433                goto out;
 434        }
 435
 436        capbuf[OSC_QUERY_TYPE] = 0;
 437        capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
 438        capbuf[OSC_CONTROL_TYPE] = ctrl;
 439        status = acpi_pci_run_osc(handle, capbuf, mask);
 440        if (ACPI_SUCCESS(status))
 441                root->osc_control_set = *mask;
 442out:
 443        mutex_unlock(&osc_lock);
 444        return status;
 445}
 446EXPORT_SYMBOL(acpi_pci_osc_control_set);
 447
 448static int __devinit acpi_pci_root_add(struct acpi_device *device)
 449{
 450        unsigned long long segment, bus;
 451        acpi_status status;
 452        int result;
 453        struct acpi_pci_root *root;
 454        acpi_handle handle;
 455        struct acpi_device *child;
 456        u32 flags, base_flags;
 457
 458        root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 459        if (!root)
 460                return -ENOMEM;
 461
 462        segment = 0;
 463        status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 464                                       &segment);
 465        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 466                printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
 467                result = -ENODEV;
 468                goto end;
 469        }
 470
 471        /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 472        root->secondary.flags = IORESOURCE_BUS;
 473        status = try_get_root_bridge_busnr(device->handle, &root->secondary);
 474        if (ACPI_FAILURE(status)) {
 475                /*
 476                 * We need both the start and end of the downstream bus range
 477                 * to interpret _CBA (MMCONFIG base address), so it really is
 478                 * supposed to be in _CRS.  If we don't find it there, all we
 479                 * can do is assume [_BBN-0xFF] or [0-0xFF].
 480                 */
 481                root->secondary.end = 0xFF;
 482                printk(KERN_WARNING FW_BUG PREFIX
 483                       "no secondary bus range in _CRS\n");
 484                status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
 485                                               NULL, &bus);
 486                if (ACPI_SUCCESS(status))
 487                        root->secondary.start = bus;
 488                else if (status == AE_NOT_FOUND)
 489                        root->secondary.start = 0;
 490                else {
 491                        printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
 492                        result = -ENODEV;
 493                        goto end;
 494                }
 495        }
 496
 497        INIT_LIST_HEAD(&root->node);
 498        root->device = device;
 499        root->segment = segment & 0xFFFF;
 500        strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 501        strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 502        device->driver_data = root;
 503
 504        root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
 505
 506        /*
 507         * All supported architectures that use ACPI have support for
 508         * PCI domains, so we indicate this in _OSC support capabilities.
 509         */
 510        flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 511        acpi_pci_osc_support(root, flags);
 512
 513        /*
 514         * TBD: Need PCI interface for enumeration/configuration of roots.
 515         */
 516
 517        mutex_lock(&acpi_pci_root_lock);
 518        list_add_tail(&root->node, &acpi_pci_roots);
 519        mutex_unlock(&acpi_pci_root_lock);
 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 out_del_root;
 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 out_del_root;
 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                status = acpi_pci_osc_support(root, flags);
 575                if (ACPI_FAILURE(status)) {
 576                        dev_info(root->bus->bridge, "ACPI _OSC support "
 577                                "notification failed, disabling PCIe ASPM\n");
 578                        pcie_no_aspm();
 579                        flags = base_flags;
 580                }
 581        }
 582
 583        if (!pcie_ports_disabled
 584            && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
 585                flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
 586                        | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
 587                        | OSC_PCI_EXPRESS_PME_CONTROL;
 588
 589                if (pci_aer_available()) {
 590                        if (aer_acpi_firmware_first())
 591                                dev_dbg(root->bus->bridge,
 592                                        "PCIe errors handled by BIOS.\n");
 593                        else
 594                                flags |= OSC_PCI_EXPRESS_AER_CONTROL;
 595                }
 596
 597                dev_info(root->bus->bridge,
 598                        "Requesting ACPI _OSC control (0x%02x)\n", flags);
 599
 600                status = acpi_pci_osc_control_set(device->handle, &flags,
 601                                        OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
 602                if (ACPI_SUCCESS(status)) {
 603                        dev_info(root->bus->bridge,
 604                                "ACPI _OSC control (0x%02x) granted\n", flags);
 605                        if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
 606                                /*
 607                                 * We have ASPM control, but the FADT indicates
 608                                 * that it's unsupported. Clear it.
 609                                 */
 610                                pcie_clear_aspm(root->bus);
 611                        }
 612                } else {
 613                        dev_info(root->bus->bridge,
 614                                "ACPI _OSC request failed (%s), "
 615                                "returned control mask: 0x%02x\n",
 616                                acpi_format_exception(status), flags);
 617                        pr_info("ACPI _OSC control for PCIe not granted, "
 618                                "disabling ASPM\n");
 619                        pcie_no_aspm();
 620                }
 621        } else {
 622                dev_info(root->bus->bridge,
 623                         "Unable to request _OSC control "
 624                         "(_OSC support mask: 0x%02x)\n", flags);
 625        }
 626
 627        pci_acpi_add_bus_pm_notifier(device, root->bus);
 628        if (device->wakeup.flags.run_wake)
 629                device_set_run_wake(root->bus->bridge, true);
 630
 631        return 0;
 632
 633out_del_root:
 634        mutex_lock(&acpi_pci_root_lock);
 635        list_del(&root->node);
 636        mutex_unlock(&acpi_pci_root_lock);
 637end:
 638        kfree(root);
 639        return result;
 640}
 641
 642static int acpi_pci_root_start(struct acpi_device *device)
 643{
 644        struct acpi_pci_root *root = acpi_driver_data(device);
 645        struct acpi_pci_driver *driver;
 646
 647        mutex_lock(&acpi_pci_root_lock);
 648        list_for_each_entry(driver, &acpi_pci_drivers, node)
 649                if (driver->add)
 650                        driver->add(root);
 651        mutex_unlock(&acpi_pci_root_lock);
 652
 653        pci_bus_add_devices(root->bus);
 654
 655        return 0;
 656}
 657
 658static int acpi_pci_root_remove(struct acpi_device *device, int type)
 659{
 660        struct acpi_pci_root *root = acpi_driver_data(device);
 661        struct acpi_pci_driver *driver;
 662
 663        mutex_lock(&acpi_pci_root_lock);
 664        list_for_each_entry(driver, &acpi_pci_drivers, node)
 665                if (driver->remove)
 666                        driver->remove(root);
 667
 668        device_set_run_wake(root->bus->bridge, false);
 669        pci_acpi_remove_bus_pm_notifier(device);
 670
 671        list_del(&root->node);
 672        mutex_unlock(&acpi_pci_root_lock);
 673        kfree(root);
 674        return 0;
 675}
 676
 677static int __init acpi_pci_root_init(void)
 678{
 679        acpi_hest_init();
 680
 681        if (acpi_pci_disabled)
 682                return 0;
 683
 684        pci_acpi_crs_quirks();
 685        if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 686                return -ENODEV;
 687
 688        return 0;
 689}
 690
 691subsys_initcall(acpi_pci_root_init);
 692
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