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/pci.h>
  13 #include <linux/pci_hotplug.h>
  14 #include <linux/module.h>
  15 #include <linux/pci-aspm.h>
  16 #include <linux/pci-acpi.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/pm_qos.h>
  19 #include "pci.h"
  20
  21 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
  22 {
  23         acpi_status status = AE_NOT_EXIST;
  24         unsigned long long mcfg_addr;
  25
  26         if (handle)
  27                 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
  28                                                NULL, &mcfg_addr);
  29         if (ACPI_FAILURE(status))
  30                 return 0;
  31
  32         return (phys_addr_t)mcfg_addr;
  33 }
  34
  35 static acpi_status decode_type0_hpx_record(union acpi_object *record,
  36                                            struct hotplug_params *hpx)
  37 {
  38         int i;
  39         union acpi_object *fields = record->package.elements;
  40         u32 revision = fields[1].integer.value;
  41
  42         switch (revision) {
  43         case 1:
  44                 if (record->package.count != 6)
  45                         return AE_ERROR;
  46                 for (i = 2; i < 6; i++)
  47                         if (fields[i].type != ACPI_TYPE_INTEGER)
  48                                 return AE_ERROR;
  49                 hpx->t0 = &hpx->type0_data;
  50                 hpx->t0->revision        = revision;
  51                 hpx->t0->cache_line_size = fields[2].integer.value;
  52                 hpx->t0->latency_timer   = fields[3].integer.value;
  53                 hpx->t0->enable_serr     = fields[4].integer.value;
  54                 hpx->t0->enable_perr     = fields[5].integer.value;
  55                 break;
  56         default:
  57                 printk(KERN_WARNING
  58                        "%s: Type 0 Revision %d record not supported\n",
  59                        __func__, revision);
  60                 return AE_ERROR;
  61         }
  62         return AE_OK;
  63 }
  64
  65 static acpi_status decode_type1_hpx_record(union acpi_object *record,
  66                                            struct hotplug_params *hpx)
  67 {
  68         int i;
  69         union acpi_object *fields = record->package.elements;
  70         u32 revision = fields[1].integer.value;
  71
  72         switch (revision) {
  73         case 1:
  74                 if (record->package.count != 5)
  75                         return AE_ERROR;
  76                 for (i = 2; i < 5; i++)
  77                         if (fields[i].type != ACPI_TYPE_INTEGER)
  78                                 return AE_ERROR;
  79                 hpx->t1 = &hpx->type1_data;
  80                 hpx->t1->revision      = revision;
  81                 hpx->t1->max_mem_read  = fields[2].integer.value;
  82                 hpx->t1->avg_max_split = fields[3].integer.value;
  83                 hpx->t1->tot_max_split = fields[4].integer.value;
  84                 break;
  85         default:
  86                 printk(KERN_WARNING
  87                        "%s: Type 1 Revision %d record not supported\n",
  88                        __func__, revision);
  89                 return AE_ERROR;
  90         }
  91         return AE_OK;
  92 }
  93
  94 static acpi_status decode_type2_hpx_record(union acpi_object *record,
  95                                            struct hotplug_params *hpx)
  96 {
  97         int i;
  98         union acpi_object *fields = record->package.elements;
  99         u32 revision = fields[1].integer.value;
 100
 101         switch (revision) {
 102         case 1:
 103                 if (record->package.count != 18)
 104                         return AE_ERROR;
 105                 for (i = 2; i < 18; i++)
 106                         if (fields[i].type != ACPI_TYPE_INTEGER)
 107                                 return AE_ERROR;
 108                 hpx->t2 = &hpx->type2_data;
 109                 hpx->t2->revision      = revision;
 110                 hpx->t2->unc_err_mask_and      = fields[2].integer.value;
 111                 hpx->t2->unc_err_mask_or       = fields[3].integer.value;
 112                 hpx->t2->unc_err_sever_and     = fields[4].integer.value;
 113                 hpx->t2->unc_err_sever_or      = fields[5].integer.value;
 114                 hpx->t2->cor_err_mask_and      = fields[6].integer.value;
 115                 hpx->t2->cor_err_mask_or       = fields[7].integer.value;
 116                 hpx->t2->adv_err_cap_and       = fields[8].integer.value;
 117                 hpx->t2->adv_err_cap_or        = fields[9].integer.value;
 118                 hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
 119                 hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
 120                 hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
 121                 hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
 122                 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
 123                 hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
 124                 hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
 125                 hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
 126                 break;
 127         default:
 128                 printk(KERN_WARNING
 129                        "%s: Type 2 Revision %d record not supported\n",
 130                        __func__, revision);
 131                 return AE_ERROR;
 132         }
 133         return AE_OK;
 134 }
 135
 136 static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
 137 {
 138         acpi_status status;
 139         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 140         union acpi_object *package, *record, *fields;
 141         u32 type;
 142         int i;
 143
 144         /* Clear the return buffer with zeros */
 145         memset(hpx, 0, sizeof(struct hotplug_params));
 146
 147         status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
 148         if (ACPI_FAILURE(status))
 149                 return status;
 150
 151         package = (union acpi_object *)buffer.pointer;
 152         if (package->type != ACPI_TYPE_PACKAGE) {
 153                 status = AE_ERROR;
 154                 goto exit;
 155         }
 156
 157         for (i = 0; i < package->package.count; i++) {
 158                 record = &package->package.elements[i];
 159                 if (record->type != ACPI_TYPE_PACKAGE) {
 160                         status = AE_ERROR;
 161                         goto exit;
 162                 }
 163
 164                 fields = record->package.elements;
 165                 if (fields[0].type != ACPI_TYPE_INTEGER ||
 166                     fields[1].type != ACPI_TYPE_INTEGER) {
 167                         status = AE_ERROR;
 168                         goto exit;
 169                 }
 170
 171                 type = fields[0].integer.value;
 172                 switch (type) {
 173                 case 0:
 174                         status = decode_type0_hpx_record(record, hpx);
 175                         if (ACPI_FAILURE(status))
 176                                 goto exit;
 177                         break;
 178                 case 1:
 179                         status = decode_type1_hpx_record(record, hpx);
 180                         if (ACPI_FAILURE(status))
 181                                 goto exit;
 182                         break;
 183                 case 2:
 184                         status = decode_type2_hpx_record(record, hpx);
 185                         if (ACPI_FAILURE(status))
 186                                 goto exit;
 187                         break;
 188                 default:
 189                         printk(KERN_ERR "%s: Type %d record not supported\n",
 190                                __func__, type);
 191                         status = AE_ERROR;
 192                         goto exit;
 193                 }
 194         }
 195  exit:
 196         kfree(buffer.pointer);
 197         return status;
 198 }
 199
 200 static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 201 {
 202         acpi_status status;
 203         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 204         union acpi_object *package, *fields;
 205         int i;
 206
 207         memset(hpp, 0, sizeof(struct hotplug_params));
 208
 209         status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
 210         if (ACPI_FAILURE(status))
 211                 return status;
 212
 213         package = (union acpi_object *) buffer.pointer;
 214         if (package->type != ACPI_TYPE_PACKAGE ||
 215             package->package.count != 4) {
 216                 status = AE_ERROR;
 217                 goto exit;
 218         }
 219
 220         fields = package->package.elements;
 221         for (i = 0; i < 4; i++) {
 222                 if (fields[i].type != ACPI_TYPE_INTEGER) {
 223                         status = AE_ERROR;
 224                         goto exit;
 225                 }
 226         }
 227
 228         hpp->t0 = &hpp->type0_data;
 229         hpp->t0->revision        = 1;
 230         hpp->t0->cache_line_size = fields[0].integer.value;
 231         hpp->t0->latency_timer   = fields[1].integer.value;
 232         hpp->t0->enable_serr     = fields[2].integer.value;
 233         hpp->t0->enable_perr     = fields[3].integer.value;
 234
 235 exit:
 236         kfree(buffer.pointer);
 237         return status;
 238 }
 239
 240 /* pci_get_hp_params
 241  *
 242  * @dev - the pci_dev for which we want parameters
 243  * @hpp - allocated by the caller
 244  */
 245 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
 246 {
 247         acpi_status status;
 248         acpi_handle handle, phandle;
 249         struct pci_bus *pbus;
 250
 251         handle = NULL;
 252         for (pbus = dev->bus; pbus; pbus = pbus->parent) {
 253                 handle = acpi_pci_get_bridge_handle(pbus);
 254                 if (handle)
 255                         break;
 256         }
 257
 258         /*
 259          * _HPP settings apply to all child buses, until another _HPP is
 260          * encountered. If we don't find an _HPP for the input pci dev,
 261          * look for it in the parent device scope since that would apply to
 262          * this pci dev.
 263          */
 264         while (handle) {
 265                 status = acpi_run_hpx(handle, hpp);
 266                 if (ACPI_SUCCESS(status))
 267                         return 0;
 268                 status = acpi_run_hpp(handle, hpp);
 269                 if (ACPI_SUCCESS(status))
 270                         return 0;
 271                 if (acpi_is_root_bridge(handle))
 272                         break;
 273                 status = acpi_get_parent(handle, &phandle);
 274                 if (ACPI_FAILURE(status))
 275                         break;
 276                 handle = phandle;
 277         }
 278         return -ENODEV;
 279 }
 280 EXPORT_SYMBOL_GPL(pci_get_hp_params);
 281
 282 /**
 283  * pci_acpi_wake_bus - Root bus wakeup notification fork function.
 284  * @work: Work item to handle.
 285  */
 286 static void pci_acpi_wake_bus(struct work_struct *work)
 287 {
 288         struct acpi_device *adev;
 289         struct acpi_pci_root *root;
 290
 291         adev = container_of(work, struct acpi_device, wakeup.context.work);
 292         root = acpi_driver_data(adev);
 293         pci_pme_wakeup_bus(root->bus);
 294 }
 295
 296 /**
 297  * pci_acpi_wake_dev - PCI device wakeup notification work function.
 298  * @handle: ACPI handle of a device the notification is for.
 299  * @work: Work item to handle.
 300  */
 301 static void pci_acpi_wake_dev(struct work_struct *work)
 302 {
 303         struct acpi_device_wakeup_context *context;
 304         struct pci_dev *pci_dev;
 305
 306         context = container_of(work, struct acpi_device_wakeup_context, work);
 307         pci_dev = to_pci_dev(context->dev);
 308
 309         if (pci_dev->pme_poll)
 310                 pci_dev->pme_poll = false;
 311
 312         if (pci_dev->current_state == PCI_D3cold) {
 313                 pci_wakeup_event(pci_dev);
 314                 pm_runtime_resume(&pci_dev->dev);
 315                 return;
 316         }
 317
 318         /* Clear PME Status if set. */
 319         if (pci_dev->pme_support)
 320                 pci_check_pme_status(pci_dev);
 321
 322         pci_wakeup_event(pci_dev);
 323         pm_runtime_resume(&pci_dev->dev);
 324
 325         pci_pme_wakeup_bus(pci_dev->subordinate);
 326 }
 327
 328 /**
 329  * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
 330  * @dev: PCI root bridge ACPI device.
 331  */
 332 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
 333 {
 334         return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
 335 }
 336
 337 /**
 338  * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
 339  * @dev: ACPI device to add the notifier for.
 340  * @pci_dev: PCI device to check for the PME status if an event is signaled.
 341  */
 342 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
 343                                      struct pci_dev *pci_dev)
 344 {
 345         return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
 346 }
 347
 348 /*
 349  * _SxD returns the D-state with the highest power
 350  * (lowest D-state number) supported in the S-state "x".
 351  *
 352  * If the devices does not have a _PRW
 353  * (Power Resources for Wake) supporting system wakeup from "x"
 354  * then the OS is free to choose a lower power (higher number
 355  * D-state) than the return value from _SxD.
 356  *
 357  * But if _PRW is enabled at S-state "x", the OS
 358  * must not choose a power lower than _SxD --
 359  * unless the device has an _SxW method specifying
 360  * the lowest power (highest D-state number) the device
 361  * may enter while still able to wake the system.
 362  *
 363  * ie. depending on global OS policy:
 364  *
 365  * if (_PRW at S-state x)
 366  *      choose from highest power _SxD to lowest power _SxW
 367  * else // no _PRW at S-state x
 368  *      choose highest power _SxD or any lower power
 369  */
 370
 371 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
 372 {
 373         int acpi_state, d_max;
 374
 375         if (pdev->no_d3cold)
 376                 d_max = ACPI_STATE_D3_HOT;
 377         else
 378                 d_max = ACPI_STATE_D3_COLD;
 379         acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
 380         if (acpi_state < 0)
 381                 return PCI_POWER_ERROR;
 382
 383         switch (acpi_state) {
 384         case ACPI_STATE_D0:
 385                 return PCI_D0;
 386         case ACPI_STATE_D1:
 387                 return PCI_D1;
 388         case ACPI_STATE_D2:
 389                 return PCI_D2;
 390         case ACPI_STATE_D3_HOT:
 391                 return PCI_D3hot;
 392         case ACPI_STATE_D3_COLD:
 393                 return PCI_D3cold;
 394         }
 395         return PCI_POWER_ERROR;
 396 }
 397
 398 static bool acpi_pci_power_manageable(struct pci_dev *dev)
 399 {
 400         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 401         return adev ? acpi_device_power_manageable(adev) : false;
 402 }
 403
 404 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 405 {
 406         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 407         static const u8 state_conv[] = {
 408                 [PCI_D0] = ACPI_STATE_D0,
 409                 [PCI_D1] = ACPI_STATE_D1,
 410                 [PCI_D2] = ACPI_STATE_D2,
 411                 [PCI_D3hot] = ACPI_STATE_D3_COLD,
 412                 [PCI_D3cold] = ACPI_STATE_D3_COLD,
 413         };
 414         int error = -EINVAL;
 415
 416         /* If the ACPI device has _EJ0, ignore the device */
 417         if (!adev || acpi_has_method(adev->handle, "_EJ0"))
 418                 return -ENODEV;
 419
 420         switch (state) {
 421         case PCI_D3cold:
 422                 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
 423                                 PM_QOS_FLAGS_ALL) {
 424                         error = -EBUSY;
 425                         break;
 426                 }
 427         case PCI_D0:
 428         case PCI_D1:
 429         case PCI_D2:
 430         case PCI_D3hot:
 431                 error = acpi_device_set_power(adev, state_conv[state]);
 432         }
 433
 434         if (!error)
 435                 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
 436                          acpi_power_state_string(state_conv[state]));
 437
 438         return error;
 439 }
 440
 441 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
 442 {
 443         struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 444         return adev ? acpi_device_can_wakeup(adev) : false;
 445 }
 446
 447 static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
 448 {
 449         while (bus->parent) {
 450                 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
 451                         return;
 452                 bus = bus->parent;
 453         }
 454
 455         /* We have reached the root bus. */
 456         if (bus->bridge)
 457                 acpi_pm_device_sleep_wake(bus->bridge, enable);
 458 }
 459
 460 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
 461 {
 462         if (acpi_pci_can_wakeup(dev))
 463                 return acpi_pm_device_sleep_wake(&dev->dev, enable);
 464
 465         acpi_pci_propagate_wakeup_enable(dev->bus, enable);
 466         return 0;
 467 }
 468
 469 static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
 470 {
 471         while (bus->parent) {
 472                 struct pci_dev *bridge = bus->self;
 473
 474                 if (bridge->pme_interrupt)
 475                         return;
 476                 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
 477                         return;
 478                 bus = bus->parent;
 479         }
 480
 481         /* We have reached the root bus. */
 482         if (bus->bridge)
 483                 acpi_pm_device_run_wake(bus->bridge, enable);
 484 }
 485
 486 static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
 487 {
 488         /*
 489          * Per PCI Express Base Specification Revision 2.0 section
 490          * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
 491          * waking up to power on the main link even if there is PME
 492          * support for D3cold
 493          */
 494         if (dev->pme_interrupt && !dev->runtime_d3cold)
 495                 return 0;
 496
 497         if (!acpi_pm_device_run_wake(&dev->dev, enable))
 498                 return 0;
 499
 500         acpi_pci_propagate_run_wake(dev->bus, enable);
 501         return 0;
 502 }
 503
 504 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
 505         .is_manageable = acpi_pci_power_manageable,
 506         .set_state = acpi_pci_set_power_state,
 507         .choose_state = acpi_pci_choose_state,
 508         .sleep_wake = acpi_pci_sleep_wake,
 509         .run_wake = acpi_pci_run_wake,
 510 };
 511
 512 void acpi_pci_add_bus(struct pci_bus *bus)
 513 {
 514         if (acpi_pci_disabled || !bus->bridge)
 515                 return;
 516
 517         acpi_pci_slot_enumerate(bus);
 518         acpiphp_enumerate_slots(bus);
 519 }
 520
 521 void acpi_pci_remove_bus(struct pci_bus *bus)
 522 {
 523         if (acpi_pci_disabled || !bus->bridge)
 524                 return;
 525
 526         acpiphp_remove_slots(bus);
 527         acpi_pci_slot_remove(bus);
 528 }
 529
 530 /* ACPI bus type */
 531 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
 532 {
 533         struct pci_dev *pci_dev = to_pci_dev(dev);
 534         bool check_children;
 535         u64 addr;
 536
 537         check_children = pci_is_bridge(pci_dev);
 538         /* Please ref to ACPI spec for the syntax of _ADR */
 539         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
 540         return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
 541                                       check_children);
 542 }
 543
 544 static void pci_acpi_setup(struct device *dev)
 545 {
 546         struct pci_dev *pci_dev = to_pci_dev(dev);
 547         struct acpi_device *adev = ACPI_COMPANION(dev);
 548
 549         if (!adev)
 550                 return;
 551
 552         pci_acpi_add_pm_notifier(adev, pci_dev);
 553         if (!adev->wakeup.flags.valid)
 554                 return;
 555
 556         device_set_wakeup_capable(dev, true);
 557         acpi_pci_sleep_wake(pci_dev, false);
 558         if (adev->wakeup.flags.run_wake)
 559                 device_set_run_wake(dev, true);
 560 }
 561
 562 static void pci_acpi_cleanup(struct device *dev)
 563 {
 564         struct acpi_device *adev = ACPI_COMPANION(dev);
 565
 566         if (!adev)
 567                 return;
 568
 569         pci_acpi_remove_pm_notifier(adev);
 570         if (adev->wakeup.flags.valid) {
 571                 device_set_wakeup_capable(dev, false);
 572                 device_set_run_wake(dev, false);
 573         }
 574 }
 575
 576 static bool pci_acpi_bus_match(struct device *dev)
 577 {
 578         return dev_is_pci(dev);
 579 }
 580
 581 static struct acpi_bus_type acpi_pci_bus = {
 582         .name = "PCI",
 583         .match = pci_acpi_bus_match,
 584         .find_companion = acpi_pci_find_companion,
 585         .setup = pci_acpi_setup,
 586         .cleanup = pci_acpi_cleanup,
 587 };
 588
 589 static int __init acpi_pci_init(void)
 590 {
 591         int ret;
 592
 593         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
 594                 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
 595                 pci_no_msi();
 596         }
 597
 598         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
 599                 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
 600                 pcie_no_aspm();
 601         }
 602
 603         ret = register_acpi_bus_type(&acpi_pci_bus);
 604         if (ret)
 605                 return 0;
 606
 607         pci_set_platform_pm(&acpi_pci_platform_pm);
 608         acpi_pci_slot_init();
 609         acpiphp_init();
 610
 611         return 0;
 612 }
 613 arch_initcall(acpi_pci_init);