drivers/acpi/acpi_processor.c

   1 /*
   2  * acpi_processor.c - ACPI processor enumeration support
   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  * Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  * Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  * Copyright (C) 2013, Intel Corporation
   9  *                     Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  */
  15
  16 #include <linux/acpi.h>
  17 #include <linux/device.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/pci.h>
  21
  22 #include <acpi/processor.h>
  23
  24 #include <asm/cpu.h>
  25
  26 #include "internal.h"
  27
  28 #define _COMPONENT      ACPI_PROCESSOR_COMPONENT
  29
  30 ACPI_MODULE_NAME("processor");
  31
  32 DEFINE_PER_CPU(struct acpi_processor *, processors);
  33 EXPORT_PER_CPU_SYMBOL(processors);
  34
  35 /* --------------------------------------------------------------------------
  36                                 Errata Handling
  37    -------------------------------------------------------------------------- */
  38
  39 struct acpi_processor_errata errata __read_mostly;
  40 EXPORT_SYMBOL_GPL(errata);
  41
  42 static int acpi_processor_errata_piix4(struct pci_dev *dev)
  43 {
  44         u8 value1 = 0;
  45         u8 value2 = 0;
  46
  47
  48         if (!dev)
  49                 return -EINVAL;
  50
  51         /*
  52          * Note that 'dev' references the PIIX4 ACPI Controller.
  53          */
  54
  55         switch (dev->revision) {
  56         case 0:
  57                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
  58                 break;
  59         case 1:
  60                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
  61                 break;
  62         case 2:
  63                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
  64                 break;
  65         case 3:
  66                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
  67                 break;
  68         default:
  69                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
  70                 break;
  71         }
  72
  73         switch (dev->revision) {
  74
  75         case 0:         /* PIIX4 A-step */
  76         case 1:         /* PIIX4 B-step */
  77                 /*
  78                  * See specification changes #13 ("Manual Throttle Duty Cycle")
  79                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
  80                  * erratum #5 ("STPCLK# Deassertion Time") from the January
  81                  * 2002 PIIX4 specification update.  Applies to only older
  82                  * PIIX4 models.
  83                  */
  84                 errata.piix4.throttle = 1;
  85
  86         case 2:         /* PIIX4E */
  87         case 3:         /* PIIX4M */
  88                 /*
  89                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
  90                  * Livelock") from the January 2002 PIIX4 specification update.
  91                  * Applies to all PIIX4 models.
  92                  */
  93
  94                 /*
  95                  * BM-IDE
  96                  * ------
  97                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
  98                  * Status register address.  We'll use this later to read
  99                  * each IDE controller's DMA status to make sure we catch all
 100                  * DMA activity.
 101                  */
 102                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 103                                      PCI_DEVICE_ID_INTEL_82371AB,
 104                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 105                 if (dev) {
 106                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 107                         pci_dev_put(dev);
 108                 }
 109
 110                 /*
 111                  * Type-F DMA
 112                  * ----------
 113                  * Find the PIIX4 ISA Controller and read the Motherboard
 114                  * DMA controller's status to see if Type-F (Fast) DMA mode
 115                  * is enabled (bit 7) on either channel.  Note that we'll
 116                  * disable C3 support if this is enabled, as some legacy
 117                  * devices won't operate well if fast DMA is disabled.
 118                  */
 119                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 120                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 121                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 122                 if (dev) {
 123                         pci_read_config_byte(dev, 0x76, &value1);
 124                         pci_read_config_byte(dev, 0x77, &value2);
 125                         if ((value1 & 0x80) || (value2 & 0x80))
 126                                 errata.piix4.fdma = 1;
 127                         pci_dev_put(dev);
 128                 }
 129
 130                 break;
 131         }
 132
 133         if (errata.piix4.bmisx)
 134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 135                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 136         if (errata.piix4.fdma)
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 138                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 139
 140         return 0;
 141 }
 142
 143 static int acpi_processor_errata(void)
 144 {
 145         int result = 0;
 146         struct pci_dev *dev = NULL;
 147
 148         /*
 149          * PIIX4
 150          */
 151         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 152                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 153                              PCI_ANY_ID, NULL);
 154         if (dev) {
 155                 result = acpi_processor_errata_piix4(dev);
 156                 pci_dev_put(dev);
 157         }
 158
 159         return result;
 160 }
 161
 162 /* --------------------------------------------------------------------------
 163                                 Initialization
 164    -------------------------------------------------------------------------- */
 165
 166 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 167 int __weak acpi_map_cpu(acpi_handle handle,
 168                 phys_cpuid_t physid, u32 acpi_id, int *pcpu)
 169 {
 170         return -ENODEV;
 171 }
 172
 173 int __weak acpi_unmap_cpu(int cpu)
 174 {
 175         return -ENODEV;
 176 }
 177
 178 int __weak arch_register_cpu(int cpu)
 179 {
 180         return -ENODEV;
 181 }
 182
 183 void __weak arch_unregister_cpu(int cpu) {}
 184
 185 static int acpi_processor_hotadd_init(struct acpi_processor *pr)
 186 {
 187         unsigned long long sta;
 188         acpi_status status;
 189         int ret;
 190
 191         if (invalid_phys_cpuid(pr->phys_id))
 192                 return -ENODEV;
 193
 194         status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
 195         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
 196                 return -ENODEV;
 197
 198         cpu_maps_update_begin();
 199         cpu_hotplug_begin();
 200
 201         ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
 202         if (ret)
 203                 goto out;
 204
 205         ret = arch_register_cpu(pr->id);
 206         if (ret) {
 207                 acpi_unmap_cpu(pr->id);
 208                 goto out;
 209         }
 210
 211         /*
 212          * CPU got hot-added, but cpu_data is not initialized yet.  Set a flag
 213          * to delay cpu_idle/throttling initialization and do it when the CPU
 214          * gets online for the first time.
 215          */
 216         pr_info("CPU%d has been hot-added\n", pr->id);
 217         pr->flags.need_hotplug_init = 1;
 218
 219 out:
 220         cpu_hotplug_done();
 221         cpu_maps_update_done();
 222         return ret;
 223 }
 224 #else
 225 static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
 226 {
 227         return -ENODEV;
 228 }
 229 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 230
 231 static int acpi_processor_get_info(struct acpi_device *device)
 232 {
 233         union acpi_object object = { 0 };
 234         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 235         struct acpi_processor *pr = acpi_driver_data(device);
 236         int device_declaration = 0;
 237         acpi_status status = AE_OK;
 238         static int cpu0_initialized;
 239         unsigned long long value;
 240
 241         acpi_processor_errata();
 242
 243         /*
 244          * Check to see if we have bus mastering arbitration control.  This
 245          * is required for proper C3 usage (to maintain cache coherency).
 246          */
 247         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 248                 pr->flags.bm_control = 1;
 249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 250                                   "Bus mastering arbitration control present\n"));
 251         } else
 252                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 253                                   "No bus mastering arbitration control\n"));
 254
 255         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 256                 /* Declared with "Processor" statement; match ProcessorID */
 257                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 258                 if (ACPI_FAILURE(status)) {
 259                         dev_err(&device->dev,
 260                                 "Failed to evaluate processor object (0x%x)\n",
 261                                 status);
 262                         return -ENODEV;
 263                 }
 264
 265                 pr->acpi_id = object.processor.proc_id;
 266         } else {
 267                 /*
 268                  * Declared with "Device" statement; match _UID.
 269                  * Note that we don't handle string _UIDs yet.
 270                  */
 271                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 272                                                 NULL, &value);
 273                 if (ACPI_FAILURE(status)) {
 274                         dev_err(&device->dev,
 275                                 "Failed to evaluate processor _UID (0x%x)\n",
 276                                 status);
 277                         return -ENODEV;
 278                 }
 279                 device_declaration = 1;
 280                 pr->acpi_id = value;
 281         }
 282
 283         if (acpi_duplicate_processor_id(pr->acpi_id)) {
 284                 dev_err(&device->dev,
 285                         "Failed to get unique processor _UID (0x%x)\n",
 286                         pr->acpi_id);
 287                 return -ENODEV;
 288         }
 289
 290         pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
 291                                         pr->acpi_id);
 292         if (invalid_phys_cpuid(pr->phys_id))
 293                 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
 294
 295         pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
 296         if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
 297                 cpu0_initialized = 1;
 298                 /*
 299                  * Handle UP system running SMP kernel, with no CPU
 300                  * entry in MADT
 301                  */
 302                 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
 303                         pr->id = 0;
 304         }
 305
 306         /*
 307          *  Extra Processor objects may be enumerated on MP systems with
 308          *  less than the max # of CPUs. They should be ignored _iff
 309          *  they are physically not present.
 310          *
 311          *  NOTE: Even if the processor has a cpuid, it may not be present
 312          *  because cpuid <-> apicid mapping is persistent now.
 313          */
 314         if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
 315                 int ret = acpi_processor_hotadd_init(pr);
 316                 if (ret)
 317                         return ret;
 318         }
 319
 320         /*
 321          * On some boxes several processors use the same processor bus id.
 322          * But they are located in different scope. For example:
 323          * \_SB.SCK0.CPU0
 324          * \_SB.SCK1.CPU0
 325          * Rename the processor device bus id. And the new bus id will be
 326          * generated as the following format:
 327          * CPU+CPU ID.
 328          */
 329         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 330         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 331                           pr->acpi_id));
 332
 333         if (!object.processor.pblk_address)
 334                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 335         else if (object.processor.pblk_length != 6)
 336                 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
 337                             object.processor.pblk_length);
 338         else {
 339                 pr->throttling.address = object.processor.pblk_address;
 340                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 341                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 342
 343                 pr->pblk = object.processor.pblk_address;
 344         }
 345
 346         /*
 347          * If ACPI describes a slot number for this CPU, we can use it to
 348          * ensure we get the right value in the "physical id" field
 349          * of /proc/cpuinfo
 350          */
 351         status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
 352         if (ACPI_SUCCESS(status))
 353                 arch_fix_phys_package_id(pr->id, value);
 354
 355         return 0;
 356 }
 357
 358 /*
 359  * Do not put anything in here which needs the core to be online.
 360  * For example MSR access or setting up things which check for cpuinfo_x86
 361  * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
 362  * Such things have to be put in and set up by the processor driver's .probe().
 363  */
 364 static DEFINE_PER_CPU(void *, processor_device_array);
 365
 366 static int acpi_processor_add(struct acpi_device *device,
 367                                         const struct acpi_device_id *id)
 368 {
 369         struct acpi_processor *pr;
 370         struct device *dev;
 371         int result = 0;
 372
 373         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 374         if (!pr)
 375                 return -ENOMEM;
 376
 377         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 378                 result = -ENOMEM;
 379                 goto err_free_pr;
 380         }
 381
 382         pr->handle = device->handle;
 383         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 384         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 385         device->driver_data = pr;
 386
 387         result = acpi_processor_get_info(device);
 388         if (result) /* Processor is not physically present or unavailable */
 389                 return 0;
 390
 391         BUG_ON(pr->id >= nr_cpu_ids);
 392
 393         /*
 394          * Buggy BIOS check.
 395          * ACPI id of processors can be reported wrongly by the BIOS.
 396          * Don't trust it blindly
 397          */
 398         if (per_cpu(processor_device_array, pr->id) != NULL &&
 399             per_cpu(processor_device_array, pr->id) != device) {
 400                 dev_warn(&device->dev,
 401                         "BIOS reported wrong ACPI id %d for the processor\n",
 402                         pr->id);
 403                 /* Give up, but do not abort the namespace scan. */
 404                 goto err;
 405         }
 406         /*
 407          * processor_device_array is not cleared on errors to allow buggy BIOS
 408          * checks.
 409          */
 410         per_cpu(processor_device_array, pr->id) = device;
 411         per_cpu(processors, pr->id) = pr;
 412
 413         dev = get_cpu_device(pr->id);
 414         if (!dev) {
 415                 result = -ENODEV;
 416                 goto err;
 417         }
 418
 419         result = acpi_bind_one(dev, device);
 420         if (result)
 421                 goto err;
 422
 423         pr->dev = dev;
 424
 425         /* Trigger the processor driver's .probe() if present. */
 426         if (device_attach(dev) >= 0)
 427                 return 1;
 428
 429         dev_err(dev, "Processor driver could not be attached\n");
 430         acpi_unbind_one(dev);
 431
 432  err:
 433         free_cpumask_var(pr->throttling.shared_cpu_map);
 434         device->driver_data = NULL;
 435         per_cpu(processors, pr->id) = NULL;
 436  err_free_pr:
 437         kfree(pr);
 438         return result;
 439 }
 440
 441 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 442 /* --------------------------------------------------------------------------
 443                                     Removal
 444    -------------------------------------------------------------------------- */
 445
 446 static void acpi_processor_remove(struct acpi_device *device)
 447 {
 448         struct acpi_processor *pr;
 449
 450         if (!device || !acpi_driver_data(device))
 451                 return;
 452
 453         pr = acpi_driver_data(device);
 454         if (pr->id >= nr_cpu_ids)
 455                 goto out;
 456
 457         /*
 458          * The only reason why we ever get here is CPU hot-removal.  The CPU is
 459          * already offline and the ACPI device removal locking prevents it from
 460          * being put back online at this point.
 461          *
 462          * Unbind the driver from the processor device and detach it from the
 463          * ACPI companion object.
 464          */
 465         device_release_driver(pr->dev);
 466         acpi_unbind_one(pr->dev);
 467
 468         /* Clean up. */
 469         per_cpu(processor_device_array, pr->id) = NULL;
 470         per_cpu(processors, pr->id) = NULL;
 471
 472         cpu_maps_update_begin();
 473         cpu_hotplug_begin();
 474
 475         /* Remove the CPU. */
 476         arch_unregister_cpu(pr->id);
 477         acpi_unmap_cpu(pr->id);
 478
 479         cpu_hotplug_done();
 480         cpu_maps_update_done();
 481
 482         try_offline_node(cpu_to_node(pr->id));
 483
 484  out:
 485         free_cpumask_var(pr->throttling.shared_cpu_map);
 486         kfree(pr);
 487 }
 488 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 489
 490 #ifdef CONFIG_X86
 491 static bool acpi_hwp_native_thermal_lvt_set;
 492 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
 493                                                           u32 lvl,
 494                                                           void *context,
 495                                                           void **rv)
 496 {
 497         u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
 498         u32 capbuf[2];
 499         struct acpi_osc_context osc_context = {
 500                 .uuid_str = sb_uuid_str,
 501                 .rev = 1,
 502                 .cap.length = 8,
 503                 .cap.pointer = capbuf,
 504         };
 505
 506         if (acpi_hwp_native_thermal_lvt_set)
 507                 return AE_CTRL_TERMINATE;
 508
 509         capbuf[0] = 0x0000;
 510         capbuf[1] = 0x1000; /* set bit 12 */
 511
 512         if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
 513                 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
 514                         u32 *capbuf_ret = osc_context.ret.pointer;
 515
 516                         if (capbuf_ret[1] & 0x1000) {
 517                                 acpi_handle_info(handle,
 518                                         "_OSC native thermal LVT Acked\n");
 519                                 acpi_hwp_native_thermal_lvt_set = true;
 520                         }
 521                 }
 522                 kfree(osc_context.ret.pointer);
 523         }
 524
 525         return AE_OK;
 526 }
 527
 528 void __init acpi_early_processor_osc(void)
 529 {
 530         if (boot_cpu_has(X86_FEATURE_HWP)) {
 531                 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 532                                     ACPI_UINT32_MAX,
 533                                     acpi_hwp_native_thermal_lvt_osc,
 534                                     NULL, NULL, NULL);
 535                 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
 536                                  acpi_hwp_native_thermal_lvt_osc,
 537                                  NULL, NULL);
 538         }
 539 }
 540 #endif
 541
 542 /*
 543  * The following ACPI IDs are known to be suitable for representing as
 544  * processor devices.
 545  */
 546 static const struct acpi_device_id processor_device_ids[] = {
 547
 548         { ACPI_PROCESSOR_OBJECT_HID, },
 549         { ACPI_PROCESSOR_DEVICE_HID, },
 550
 551         { }
 552 };
 553
 554 static struct acpi_scan_handler processor_handler = {
 555         .ids = processor_device_ids,
 556         .attach = acpi_processor_add,
 557 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 558         .detach = acpi_processor_remove,
 559 #endif
 560         .hotplug = {
 561                 .enabled = true,
 562         },
 563 };
 564
 565 static int acpi_processor_container_attach(struct acpi_device *dev,
 566                                            const struct acpi_device_id *id)
 567 {
 568         return 1;
 569 }
 570
 571 static const struct acpi_device_id processor_container_ids[] = {
 572         { ACPI_PROCESSOR_CONTAINER_HID, },
 573         { }
 574 };
 575
 576 static struct acpi_scan_handler processor_container_handler = {
 577         .ids = processor_container_ids,
 578         .attach = acpi_processor_container_attach,
 579 };
 580
 581 /* The number of the unique processor IDs */
 582 static int nr_unique_ids __initdata;
 583
 584 /* The number of the duplicate processor IDs */
 585 static int nr_duplicate_ids;
 586
 587 /* Used to store the unique processor IDs */
 588 static int unique_processor_ids[] __initdata = {
 589         [0 ... NR_CPUS - 1] = -1,
 590 };
 591
 592 /* Used to store the duplicate processor IDs */
 593 static int duplicate_processor_ids[] = {
 594         [0 ... NR_CPUS - 1] = -1,
 595 };
 596
 597 static void __init processor_validated_ids_update(int proc_id)
 598 {
 599         int i;
 600
 601         if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
 602                 return;
 603
 604         /*
 605          * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
 606          * already in the IDs, do nothing.
 607          */
 608         for (i = 0; i < nr_duplicate_ids; i++) {
 609                 if (duplicate_processor_ids[i] == proc_id)
 610                         return;
 611         }
 612
 613         /*
 614          * Secondly, compare the proc_id with unique IDs, if the proc_id is in
 615          * the IDs, put it in the duplicate IDs.
 616          */
 617         for (i = 0; i < nr_unique_ids; i++) {
 618                 if (unique_processor_ids[i] == proc_id) {
 619                         duplicate_processor_ids[nr_duplicate_ids] = proc_id;
 620                         nr_duplicate_ids++;
 621                         return;
 622                 }
 623         }
 624
 625         /*
 626          * Lastly, the proc_id is a unique ID, put it in the unique IDs.
 627          */
 628         unique_processor_ids[nr_unique_ids] = proc_id;
 629         nr_unique_ids++;
 630 }
 631
 632 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
 633                                                   u32 lvl,
 634                                                   void *context,
 635                                                   void **rv)
 636 {
 637         acpi_status status;
 638         acpi_object_type acpi_type;
 639         unsigned long long uid;
 640         union acpi_object object = { 0 };
 641         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 642
 643         status = acpi_get_type(handle, &acpi_type);
 644         if (ACPI_FAILURE(status))
 645                 return false;
 646
 647         switch (acpi_type) {
 648         case ACPI_TYPE_PROCESSOR:
 649                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 650                 if (ACPI_FAILURE(status))
 651                         goto err;
 652                 uid = object.processor.proc_id;
 653                 break;
 654
 655         case ACPI_TYPE_DEVICE:
 656                 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
 657                 if (ACPI_FAILURE(status))
 658                         goto err;
 659                 break;
 660         default:
 661                 goto err;
 662         }
 663
 664         processor_validated_ids_update(uid);
 665         return true;
 666
 667 err:
 668         acpi_handle_info(handle, "Invalid processor object\n");
 669         return false;
 670
 671 }
 672
 673 void __init acpi_processor_check_duplicates(void)
 674 {
 675         /* check the correctness for all processors in ACPI namespace */
 676         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 677                                                 ACPI_UINT32_MAX,
 678                                                 acpi_processor_ids_walk,
 679                                                 NULL, NULL, NULL);
 680         acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
 681                                                 NULL, NULL);
 682 }
 683
 684 bool acpi_duplicate_processor_id(int proc_id)
 685 {
 686         int i;
 687
 688         /*
 689          * compare the proc_id with duplicate IDs, if the proc_id is already
 690          * in the duplicate IDs, return true, otherwise, return false.
 691          */
 692         for (i = 0; i < nr_duplicate_ids; i++) {
 693                 if (duplicate_processor_ids[i] == proc_id)
 694                         return true;
 695         }
 696         return false;
 697 }
 698
 699 void __init acpi_processor_init(void)
 700 {
 701         acpi_processor_check_duplicates();
 702         acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
 703         acpi_scan_add_handler(&processor_container_handler);
 704 }