drivers/pci/pci-acpi.c

   1 /*
   2  * File:        pci-acpi.c
   3  * Purpose:     Provide PCI support in ACPI
   4  *
   5  * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
   7  * Copyright (C) 2004 Intel Corp.
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/init.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/pci.h>
  14 #include <linux/msi.h>
  15 #include <linux/pci_hotplug.h>
  16 #include <linux/module.h>
  17 #include <linux/pci-aspm.h>
  18 #include <linux/pci-acpi.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/pm_qos.h>
  21 #include "pci.h"
  22
  23 /*
  24  * The UUID is defined in the PCI Firmware Specification available here:
  25  * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
  26  */
  27 const u8 pci_acpi_dsm_uuid[] = {
  28         0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
  29         0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
  30 };
  31
  32 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
  33 static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
  34 {
  35         struct device *dev = &adev->dev;
  36         struct resource_entry *entry;
  37         struct list_head list;
  38         unsigned long flags;
  39         int ret;
  40
  41         INIT_LIST_HEAD(&list);
  42         flags = IORESOURCE_MEM;
  43         ret = acpi_dev_get_resources(adev, &list,
  44                                      acpi_dev_filter_resource_type_cb,
  45                                      (void *) flags);
  46         if (ret < 0) {
  47                 dev_err(dev, "failed to parse _CRS method, error code %d\n",
  48                         ret);
  49                 return ret;
  50         }
  51
  52         if (ret == 0) {
  53                 dev_err(dev, "no IO and memory resources present in _CRS\n");
  54                 return -EINVAL;
  55         }
  56
  57         entry = list_first_entry(&list, struct resource_entry, node);
  58         *res = *entry->res;
  59         acpi_dev_free_resource_list(&list);
  60         return 0;
  61 }
  62
  63 static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
  64                                  void **retval)
  65 {
  66         u16 *segment = context;
  67         unsigned long long uid;
  68         acpi_status status;
  69
  70         status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
  71         if (ACPI_FAILURE(status) || uid != *segment)
  72                 return AE_CTRL_DEPTH;
  73
  74         *(acpi_handle *)retval = handle;
  75         return AE_CTRL_TERMINATE;
  76 }
  77
  78 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
  79                           struct resource *res)
  80 {
  81         struct acpi_device *adev;
  82         acpi_status status;
  83         acpi_handle handle;
  84         int ret;
  85
  86         status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
  87         if (ACPI_FAILURE(status)) {
  88                 dev_err(dev, "can't find _HID %s device to locate resources\n",
  89                         hid);
  90                 return -ENODEV;
  91         }
  92
  93         ret = acpi_bus_get_device(handle, &adev);
  94         if (ret)
  95                 return ret;
  96
  97         ret = acpi_get_rc_addr(adev, res);
  98         if (ret) {
  99                 dev_err(dev, "can't get resource from %s\n",
 100                         dev_name(&adev->dev));
 101                 return ret;
 102         }
 103
 104         return 0;
 105 }
 106 #endif
 107
 108 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
 109 {
 110         acpi_status status = AE_NOT_EXIST;
 111         unsigned long long mcfg_addr;
 112
 113         if (handle)
 114                 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
 115                                                NULL, &mcfg_addr);
 116         if (ACPI_FAILURE(status))
 117                 return 0;
 118
 119         return (phys_addr_t)mcfg_addr;
 120 }
 121
 122 static acpi_status decode_type0_hpx_record(union acpi_object *record,
 123                                            struct hotplug_params *hpx)
 124 {
 125         int i;
 126         union acpi_object *fields = record->package.elements;
 127         u32 revision = fields[1].integer.value;
 128
 129         switch (revision) {
 130         case 1:
 131                 if (record->package.count != 6)
 132                         return AE_ERROR;
 133                 for (i = 2; i < 6; i++)
 134                         if (fields[i].type != ACPI_TYPE_INTEGER)
 135                                 return AE_ERROR;
 136                 hpx->t0 = &hpx->type0_data;
 137                 hpx->t0->revision        = revision;
 138                 hpx->t0->cache_line_size = fields[2].integer.value;
 139                 hpx->t0->latency_timer   = fields[3].integer.value;
 140                 hpx->t0->enable_serr     = fields[4].integer.value;
 141                 hpx->t0->enable_perr     = fields[5].integer.value;
 142                 break;
 143         default:
 144                 printk(KERN_WARNING
 145                        "%s: Type 0 Revision %d record not supported\n",
 146                        __func__, revision);
 147                 return AE_ERROR;
 148         }
 149         return AE_OK;
 150 }
 151
 152 static acpi_status decode_type1_hpx_record(union acpi_object *record,
 153                                            struct hotplug_params *hpx)
 154 {
 155         int i;
 156         union acpi_object *fields = record->package.elements;
 157         u32 revision = fields[1].integer.value;
 158
 159         switch (revision) {
 160         case 1:
 161                 if (record->package.count != 5)
 162                         return AE_ERROR;
 163                 for (i = 2; i < 5; i++)
 164                         if (fields[i].type != ACPI_TYPE_INTEGER)
 165                                 return AE_ERROR;
 166                 hpx->t1 = &hpx->type1_data;
 167                 hpx->t1->revision      = revision;
 168                 hpx->t1->max_mem_read  = fields[2].integer.value;
 169                 hpx->t1->avg_max_split = fields[3].integer.value;
 170                 hpx->t1->tot_max_split = fields[4].integer.value;
 171                 break;
 172         default:
 173                 printk(KERN_WARNING
 174                        "%s: Type 1 Revision %d record not supported\n",
 175                        __func__, revision);
 176                 return AE_ERROR;
 177         }
 178         return AE_OK;
 179 }
 180
 181 static acpi_status decode_type2_hpx_record(union acpi_object *record,
 182                                            struct hotplug_params *hpx)
 183 {
 184         int i;
 185         union acpi_object *fields = record->package.elements;
 186         u32 revision = fields[1].integer.value;
 187
 188         switch (revision) {
 189         case 1:
 190                 if (record->package.count != 18)
 191                         return AE_ERROR;
 192                 for (i = 2; i < 18; i++)
 193                         if (fields[i].type != ACPI_TYPE_INTEGER)
 194                                 return AE_ERROR;
 195                 hpx->t2 = &hpx->type2_data;
 196                 hpx->t2->revision      = revision;
 197                 hpx->t2->unc_err_mask_and      = fields[2].integer.value;
 198                 hpx->t2->unc_err_mask_or       = fields[3].integer.value;
 199                 hpx->t2->unc_err_sever_and     = fields[4].integer.value;
 200                 hpx->t2->unc_err_sever_or      = fields[5].integer.value;
 201                 hpx->t2->cor_err_mask_and      = fields[6].integer.value;
 202                 hpx->t2->cor_err_mask_or       = fields[7].integer.value;
 203                 hpx->t2->adv_err_cap_and       = fields[8].integer.value;
 204                 hpx->t2->adv_err_cap_or        = fields[9].integer.value;
 205                 hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
 206                 hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
 207                 hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
 208                 hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
 209                 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
 210                 hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
 211                 hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
 212                 hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
 213                 break;
 214         default:
 215                 printk(KERN_WARNING
 216                        "%s: Type 2 Revision %d record not supported\n",
 217                        __func__, revision);
 218                 return AE_ERROR;
 219         }
 220         return AE_OK;
 221 }
 222
 223 static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
 224 {
 225         acpi_status status;
 226         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 227         union acpi_object *package, *record, *fields;
 228         u32 type;
 229         int i;
 230
 231         /* Clear the return buffer with zeros */
 232         memset(hpx, 0, sizeof(struct hotplug_params));
 233
 234         status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
 235         if (ACPI_FAILURE(status))
 236                 return status;
 237
 238         package = (union acpi_object *)buffer.pointer;
 239         if (package->type != ACPI_TYPE_PACKAGE) {
 240                 status = AE_ERROR;
 241                 goto exit;
 242         }
 243
 244         for (i = 0; i < package->package.count; i++) {
 245                 record = &package->package.elements[i];
 246                 if (record->type != ACPI_TYPE_PACKAGE) {
 247                         status = AE_ERROR;
 248                         goto exit;
 249                 }
 250
 251                 fields = record->package.elements;
 252                 if (fields[0].type != ACPI_TYPE_INTEGER ||
 253                     fields[1].type != ACPI_TYPE_INTEGER) {
 254                         status = AE_ERROR;
 255                         goto exit;
 256                 }
 257
 258                 type = fields[0].integer.value;
 259                 switch (type) {
 260                 case 0:
 261                         status = decode_type0_hpx_record(record, hpx);
 262                         if (ACPI_FAILURE(status))
 263                                 goto exit;
 264                         break;
 265                 case 1:
 266                         status = decode_type1_hpx_record(record, hpx);
 267                         if (ACPI_FAILURE(status))
 268                                 goto exit;
 269                         break;
 270                 case 2:
 271                         status = decode_type2_hpx_record(record, hpx);
 272                         if (ACPI_FAILURE(status))
 273                                 goto exit;
 274                         break;
 275                 default:
 276                         printk(KERN_ERR "%s: Type %d record not supported\n",
 277                                __func__, type);
 278                         status = AE_ERROR;
 279                         goto exit;
 280                 }
 281         }
 282  exit:
 283         kfree(buffer.pointer);
 284         return status;
 285 }
 286
 287 static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 288 {
 289         acpi_status status;
 290         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 291         union acpi_object *package, *fields;
 292         int i;
 293
 294         memset(hpp, 0, sizeof(struct hotplug_params));
 295
 296         status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
 297         if (ACPI_FAILURE(status))
 298                 return status;
 299
 300         package = (union acpi_object *) buffer.pointer;
 301         if (package->type != ACPI_TYPE_PACKAGE ||
 302             package->package.count != 4) {
 303                 status = AE_ERROR;
 304                 goto exit;
 305         }
 306
 307         fields = package->package.elements;
 308         for (i = 0; i < 4; i++) {
 309                 if (fields[i].type != ACPI_TYPE_INTEGER) {
 310                         status = AE_ERROR;
 311                         goto exit;
 312                 }
 313         }
 314
 315         hpp->t0 = &hpp->type0_data;
 316         hpp->t0->revision        = 1;
 317         hpp->t0->cache_line_size = fields[0].integer.value;
 318         hpp->t0->latency_timer   = fields[1].integer.value;
 319         hpp->t0->enable_serr     = fields[2].integer.value;
 320         hpp->t0->enable_perr     = fields[3].integer.value;
 321
 322 exit:
 323         kfree(buffer.pointer);
 324         return status;
 325 }
 326
 327 /* pci_get_hp_params
 328  *
 329  * @dev - the pci_dev for which we want parameters
 330  * @hpp - allocated by the caller
 331  */
 332 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
 333 {
 334         acpi_status status;
 335         acpi_handle handle, phandle;
 336         struct pci_bus *pbus;
 337
 338         if (acpi_pci_disabled)
 339                 return -ENODEV;
 340
 341         handle = NULL;
 342         for (pbus = dev->bus; pbus; pbus = pbus->parent) {
 343                 handle = acpi_pci_get_bridge_handle(pbus);
 344                 if (handle)
 345                         break;
 346         }
 347
 348         /*
 349          * _HPP settings apply to all child buses, until another _HPP is
 350          * encountered. If we don't find an _HPP for the input pci dev,
 351          * look for it in the parent device scope since that would apply to
 352          * this pci dev.
 353          */
 354         while (handle) {
 355                 status = acpi_run_hpx(handle, hpp);
 356                 if (ACPI_SUCCESS(status))
 357                         return 0;
 358                 status = acpi_run_hpp(handle, hpp);
 359                 if (ACPI_SUCCESS(status))
 360                         return 0;
 361                 if (acpi_is_root_bridge(handle))
 362                         break;
 363                 status = acpi_get_parent(handle, &phandle);
 364                 if (ACPI_FAILURE(status))
 365                         break;
 366                 handle = phandle;
 367         }
 368         return -ENODEV;
 369 }
 370 EXPORT_SYMBOL_GPL(pci_get_hp_params);
 371
 372 /**
 373  * pciehp_is_native - Check whether a hotplug port is handled by the OS
 374  * @pdev: Hotplug port to check
 375  *
 376  * Walk up from @pdev to the host bridge, obtain its cached _OSC Control Field
 377  * and return the value of the "PCI Express Native Hot Plug control" bit.
 378  * On failure to obtain the _OSC Control Field return %false.
 379  */
 380 bool pciehp_is_native(struct pci_dev *pdev)
 381 {
 382         struct acpi_pci_root *root;
 383         acpi_handle handle;
 384
 385         handle = acpi_find_root_bridge_handle(pdev);
 386         if (!handle)
 387                 return false;
 388
 389         root = acpi_pci_find_root(handle);
 390         if (!root)
 391                 return false;
 392
 393         return root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL;
 394 }
 395
 396 /**
 397  * pci_acpi_wake_bus - Root bus wakeup notification fork function.
 398  * @work: Work item to handle.
 399  */
 400 static void pci_acpi_wake_bus(struct work_struct *work)
 401 {
 402         struct acpi_device *adev;
 403         struct acpi_pci_root *root;
 404
 405         adev = container_of(work, struct acpi_device, wakeup.context.work);
 406         root = acpi_driver_data(adev);
 407         pci_pme_wakeup_bus(root->bus);
 408 }
 409
 410 /**
 411  * pci_acpi_wake_dev - PCI device wakeup notification work function.
 412  * @handle: ACPI handle of a device the notification is for.
 413  * @work: Work item to handle.
 414  */
 415 static void pci_acpi_wake_dev(struct work_struct *work)
 416 {
 417         struct acpi_device_wakeup_context *context;
 418         struct pci_dev *pci_dev;
 419
 420         context = container_of(work, struct acpi_device_wakeup_context, work);
 421         pci_dev = to_pci_dev(context->dev);
 422
 423         if (pci_dev->pme_poll)
 424                 pci_dev->pme_poll = false;
 425
 426         if (pci_dev->current_state == PCI_D3cold) {
 427                 pci_wakeup_event(pci_dev);
 428                 pm_runtime_resume(&pci_dev->dev);
 429                 return;
 430         }
 431
 432         /* Clear PME Status if set. */
 433         if (pci_dev->pme_support)
 434                 pci_check_pme_status(pci_dev);
 435
 436         pci_wakeup_event(pci_dev);
 437         pm_runtime_resume(&pci_dev->dev);
 438
 439         pci_pme_wakeup_bus(pci_dev->subordinate);
 440 }
 441
 442 /**
 443  * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
 444  * @dev: PCI root bridge ACPI device.
 445  */
 446 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
 447 {
 448         return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
 449 }
 450
 451 /**
 452  * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
 453  * @dev: ACPI device to add the notifier for.
 454  * @pci_dev: PCI device to check for the PME status if an event is signaled.
 455  */
 456 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
 457                                      struct pci_dev *pci_dev)
 458 {
 459         return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
 460 }
 461
 462 /*
 463  * _SxD returns the D-state with the highest power
 464  * (lowest D-state number) supported in the S-state "x".
 465  *
 466  * If the devices does not have a _PRW
 467  * (Power Resources for Wake) supporting system wakeup from "x"
 468  * then the OS is free to choose a lower power (higher number
 469  * D-state) than the return value from _SxD.
 470  *
 471  * But if _PRW is enabled at S-state "x", the OS
 472  * must not choose a power lower than _SxD --
 473  * unless the device has an _SxW method specifying
 474  * the lowest power (highest D-state number) the device
 475  * may enter while still able to wake the system.
 476  *
 477  * ie. depending on global OS policy:
 478  *
 479  * if (_PRW at S-state x)
 480  *      choose from highest power _SxD to lowest power _SxW
 481  * else // no _PRW at S-state x
 482  *      choose highest power _SxD or any lower power
 483  */
 484
 485 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
 486 {
 487         int acpi_state, d_max;
 488
 489         if (pdev->no_d3cold)
 490                 d_max = ACPI_STATE_D3_HOT;
 491         else
 492                 d_max = ACPI_STATE_D3_COLD;
 493         acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
 494         if (acpi_state < 0)
 495                 return PCI_POWER_ERROR;
 496
 497         switch (acpi_state) {
 498         case ACPI_STATE_D0:
 499                 return PCI_D0;
 500         case ACPI_STATE_D1:
 501                 return PCI_D1;
 502         case ACPI_STATE_D2:
 503                 return PCI_D2;
 504         case ACPI_STATE_D3_HOT:
 505                 return PCI_D3hot;
 506         case ACPI_STATE_D3_COLD:
 507                 return PCI_D3cold;
 508         }
 509         return PCI_POWER_ERROR;
 510 }
 511
 512 static bool acpi_pci_power_manageable(struct pci_dev *dev)
 513 {
 514         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 515         return adev ? acpi_device_power_manageable(adev) : false;
 516 }
 517
 518 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 519 {
 520         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 521         static const u8 state_conv[] = {
 522                 [PCI_D0] = ACPI_STATE_D0,
 523                 [PCI_D1] = ACPI_STATE_D1,
 524                 [PCI_D2] = ACPI_STATE_D2,
 525                 [PCI_D3hot] = ACPI_STATE_D3_HOT,
 526                 [PCI_D3cold] = ACPI_STATE_D3_COLD,
 527         };
 528         int error = -EINVAL;
 529
 530         /* If the ACPI device has _EJ0, ignore the device */
 531         if (!adev || acpi_has_method(adev->handle, "_EJ0"))
 532                 return -ENODEV;
 533
 534         switch (state) {
 535         case PCI_D3cold:
 536                 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
 537                                 PM_QOS_FLAGS_ALL) {
 538                         error = -EBUSY;
 539                         break;
 540                 }
 541         case PCI_D0:
 542         case PCI_D1:
 543         case PCI_D2:
 544         case PCI_D3hot:
 545                 error = acpi_device_set_power(adev, state_conv[state]);
 546         }
 547
 548         if (!error)
 549                 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
 550                          acpi_power_state_string(state_conv[state]));
 551
 552         return error;
 553 }
 554
 555 static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
 556 {
 557         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 558         static const pci_power_t state_conv[] = {
 559                 [ACPI_STATE_D0]      = PCI_D0,
 560                 [ACPI_STATE_D1]      = PCI_D1,
 561                 [ACPI_STATE_D2]      = PCI_D2,
 562                 [ACPI_STATE_D3_HOT]  = PCI_D3hot,
 563                 [ACPI_STATE_D3_COLD] = PCI_D3cold,
 564         };
 565         int state;
 566
 567         if (!adev || !acpi_device_power_manageable(adev))
 568                 return PCI_UNKNOWN;
 569
 570         if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN)
 571                 return PCI_UNKNOWN;
 572
 573         return state_conv[state];
 574 }
 575
 576 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
 577 {
 578         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 579         return adev ? acpi_device_can_wakeup(adev) : false;
 580 }
 581
 582 static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
 583 {
 584         while (bus->parent) {
 585                 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
 586                         return;
 587                 bus = bus->parent;
 588         }
 589
 590         /* We have reached the root bus. */
 591         if (bus->bridge)
 592                 acpi_pm_device_sleep_wake(bus->bridge, enable);
 593 }
 594
 595 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
 596 {
 597         if (acpi_pci_can_wakeup(dev))
 598                 return acpi_pm_device_sleep_wake(&dev->dev, enable);
 599
 600         acpi_pci_propagate_wakeup_enable(dev->bus, enable);
 601         return 0;
 602 }
 603
 604 static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
 605 {
 606         while (bus->parent) {
 607                 struct pci_dev *bridge = bus->self;
 608
 609                 if (bridge->pme_interrupt)
 610                         return;
 611                 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
 612                         return;
 613                 bus = bus->parent;
 614         }
 615
 616         /* We have reached the root bus. */
 617         if (bus->bridge)
 618                 acpi_pm_device_run_wake(bus->bridge, enable);
 619 }
 620
 621 static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
 622 {
 623         /*
 624          * Per PCI Express Base Specification Revision 2.0 section
 625          * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
 626          * waking up to power on the main link even if there is PME
 627          * support for D3cold
 628          */
 629         if (dev->pme_interrupt && !dev->runtime_d3cold)
 630                 return 0;
 631
 632         if (!acpi_pm_device_run_wake(&dev->dev, enable))
 633                 return 0;
 634
 635         acpi_pci_propagate_run_wake(dev->bus, enable);
 636         return 0;
 637 }
 638
 639 static bool acpi_pci_need_resume(struct pci_dev *dev)
 640 {
 641         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 642
 643         if (!adev || !acpi_device_power_manageable(adev))
 644                 return false;
 645
 646         if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
 647                 return true;
 648
 649         if (acpi_target_system_state() == ACPI_STATE_S0)
 650                 return false;
 651
 652         return !!adev->power.flags.dsw_present;
 653 }
 654
 655 static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
 656         .is_manageable = acpi_pci_power_manageable,
 657         .set_state = acpi_pci_set_power_state,
 658         .get_state = acpi_pci_get_power_state,
 659         .choose_state = acpi_pci_choose_state,
 660         .sleep_wake = acpi_pci_sleep_wake,
 661         .run_wake = acpi_pci_run_wake,
 662         .need_resume = acpi_pci_need_resume,
 663 };
 664
 665 void acpi_pci_add_bus(struct pci_bus *bus)
 666 {
 667         union acpi_object *obj;
 668         struct pci_host_bridge *bridge;
 669
 670         if (acpi_pci_disabled || !bus->bridge)
 671                 return;
 672
 673         acpi_pci_slot_enumerate(bus);
 674         acpiphp_enumerate_slots(bus);
 675
 676         /*
 677          * For a host bridge, check its _DSM for function 8 and if
 678          * that is available, mark it in pci_host_bridge.
 679          */
 680         if (!pci_is_root_bus(bus))
 681                 return;
 682
 683         obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
 684                                 RESET_DELAY_DSM, NULL);
 685         if (!obj)
 686                 return;
 687
 688         if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
 689                 bridge = pci_find_host_bridge(bus);
 690                 bridge->ignore_reset_delay = 1;
 691         }
 692         ACPI_FREE(obj);
 693 }
 694
 695 void acpi_pci_remove_bus(struct pci_bus *bus)
 696 {
 697         if (acpi_pci_disabled || !bus->bridge)
 698                 return;
 699
 700         acpiphp_remove_slots(bus);
 701         acpi_pci_slot_remove(bus);
 702 }
 703
 704 /* ACPI bus type */
 705 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
 706 {
 707         struct pci_dev *pci_dev = to_pci_dev(dev);
 708         bool check_children;
 709         u64 addr;
 710
 711         check_children = pci_is_bridge(pci_dev);
 712         /* Please ref to ACPI spec for the syntax of _ADR */
 713         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
 714         return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
 715                                       check_children);
 716 }
 717
 718 /**
 719  * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
 720  * @pdev: the PCI device whose delay is to be updated
 721  * @handle: ACPI handle of this device
 722  *
 723  * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
 724  * control method of either the device itself or the PCI host bridge.
 725  *
 726  * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
 727  * host bridge.  If it returns one, the OS may assume that all devices in
 728  * the hierarchy have already completed power-on reset delays.
 729  *
 730  * Function 9, "Device Readiness Durations," applies only to the object
 731  * where it is located.  It returns delay durations required after various
 732  * events if the device requires less time than the spec requires.  Delays
 733  * from this function take precedence over the Reset Delay function.
 734  *
 735  * These _DSM functions are defined by the draft ECN of January 28, 2014,
 736  * titled "ACPI additions for FW latency optimizations."
 737  */
 738 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
 739                                     acpi_handle handle)
 740 {
 741         struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
 742         int value;
 743         union acpi_object *obj, *elements;
 744
 745         if (bridge->ignore_reset_delay)
 746                 pdev->d3cold_delay = 0;
 747
 748         obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
 749                                 FUNCTION_DELAY_DSM, NULL);
 750         if (!obj)
 751                 return;
 752
 753         if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
 754                 elements = obj->package.elements;
 755                 if (elements[0].type == ACPI_TYPE_INTEGER) {
 756                         value = (int)elements[0].integer.value / 1000;
 757                         if (value < PCI_PM_D3COLD_WAIT)
 758                                 pdev->d3cold_delay = value;
 759                 }
 760                 if (elements[3].type == ACPI_TYPE_INTEGER) {
 761                         value = (int)elements[3].integer.value / 1000;
 762                         if (value < PCI_PM_D3_WAIT)
 763                                 pdev->d3_delay = value;
 764                 }
 765         }
 766         ACPI_FREE(obj);
 767 }
 768
 769 static void pci_acpi_setup(struct device *dev)
 770 {
 771         struct pci_dev *pci_dev = to_pci_dev(dev);
 772         struct acpi_device *adev = ACPI_COMPANION(dev);
 773
 774         if (!adev)
 775                 return;
 776
 777         pci_acpi_optimize_delay(pci_dev, adev->handle);
 778
 779         pci_acpi_add_pm_notifier(adev, pci_dev);
 780         if (!adev->wakeup.flags.valid)
 781                 return;
 782
 783         device_set_wakeup_capable(dev, true);
 784         acpi_pci_sleep_wake(pci_dev, false);
 785         if (adev->wakeup.flags.run_wake)
 786                 device_set_run_wake(dev, true);
 787 }
 788
 789 static void pci_acpi_cleanup(struct device *dev)
 790 {
 791         struct acpi_device *adev = ACPI_COMPANION(dev);
 792
 793         if (!adev)
 794                 return;
 795
 796         pci_acpi_remove_pm_notifier(adev);
 797         if (adev->wakeup.flags.valid) {
 798                 device_set_wakeup_capable(dev, false);
 799                 device_set_run_wake(dev, false);
 800         }
 801 }
 802
 803 static bool pci_acpi_bus_match(struct device *dev)
 804 {
 805         return dev_is_pci(dev);
 806 }
 807
 808 static struct acpi_bus_type acpi_pci_bus = {
 809         .name = "PCI",
 810         .match = pci_acpi_bus_match,
 811         .find_companion = acpi_pci_find_companion,
 812         .setup = pci_acpi_setup,
 813         .cleanup = pci_acpi_cleanup,
 814 };
 815
 816
 817 static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
 818
 819 /**
 820  * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
 821  * @fn:       Callback matching a device to a fwnode that identifies a PCI
 822  *            MSI domain.
 823  *
 824  * This should be called by irqchip driver, which is the parent of
 825  * the MSI domain to provide callback interface to query fwnode.
 826  */
 827 void
 828 pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
 829 {
 830         pci_msi_get_fwnode_cb = fn;
 831 }
 832
 833 /**
 834  * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
 835  * @bus:      The PCI host bridge bus.
 836  *
 837  * This function uses the callback function registered by
 838  * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
 839  * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
 840  * This returns NULL on error or when the domain is not found.
 841  */
 842 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
 843 {
 844         struct fwnode_handle *fwnode;
 845
 846         if (!pci_msi_get_fwnode_cb)
 847                 return NULL;
 848
 849         fwnode = pci_msi_get_fwnode_cb(&bus->dev);
 850         if (!fwnode)
 851                 return NULL;
 852
 853         return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
 854 }
 855
 856 static int __init acpi_pci_init(void)
 857 {
 858         int ret;
 859
 860         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
 861                 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
 862                 pci_no_msi();
 863         }
 864
 865         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
 866                 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
 867                 pcie_no_aspm();
 868         }
 869
 870         ret = register_acpi_bus_type(&acpi_pci_bus);
 871         if (ret)
 872                 return 0;
 873
 874         pci_set_platform_pm(&acpi_pci_platform_pm);
 875         acpi_pci_slot_init();
 876         acpiphp_init();
 877
 878         return 0;
 879 }
 880 arch_initcall(acpi_pci_init);