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