drivers/acpi/acpi_processor.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * acpi_processor.c - ACPI processor enumeration support
   4  *
   5  * Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   6  * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   7  * Copyright (C) 2004       Dominik Brodowski <[email protected]>
   8  * Copyright (C) 2004  Anil S Keshavamurthy <[email protected]>
   9  * Copyright (C) 2013, Intel Corporation
  10  *                     Rafael J. Wysocki <[email protected]>
  11  */
  12
  13 #include <linux/acpi.h>
  14 #include <linux/device.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18
  19 #include <acpi/processor.h>
  20
  21 #include <asm/cpu.h>
  22
  23 #include "internal.h"
  24
  25 #define _COMPONENT      ACPI_PROCESSOR_COMPONENT
  26
  27 ACPI_MODULE_NAME("processor");
  28
  29 DEFINE_PER_CPU(struct acpi_processor *, processors);
  30 EXPORT_PER_CPU_SYMBOL(processors);
  31
  32 /* Errata Handling */
  33 struct acpi_processor_errata errata __read_mostly;
  34 EXPORT_SYMBOL_GPL(errata);
  35
  36 static int acpi_processor_errata_piix4(struct pci_dev *dev)
  37 {
  38         u8 value1 = 0;
  39         u8 value2 = 0;
  40
  41
  42         if (!dev)
  43                 return -EINVAL;
  44
  45         /*
  46          * Note that 'dev' references the PIIX4 ACPI Controller.
  47          */
  48
  49         switch (dev->revision) {
  50         case 0:
  51                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
  52                 break;
  53         case 1:
  54                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
  55                 break;
  56         case 2:
  57                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
  58                 break;
  59         case 3:
  60                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
  61                 break;
  62         default:
  63                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
  64                 break;
  65         }
  66
  67         switch (dev->revision) {
  68
  69         case 0:         /* PIIX4 A-step */
  70         case 1:         /* PIIX4 B-step */
  71                 /*
  72                  * See specification changes #13 ("Manual Throttle Duty Cycle")
  73                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
  74                  * erratum #5 ("STPCLK# Deassertion Time") from the January
  75                  * 2002 PIIX4 specification update.  Applies to only older
  76                  * PIIX4 models.
  77                  */
  78                 errata.piix4.throttle = 1;
  79                 fallthrough;
  80
  81         case 2:         /* PIIX4E */
  82         case 3:         /* PIIX4M */
  83                 /*
  84                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
  85                  * Livelock") from the January 2002 PIIX4 specification update.
  86                  * Applies to all PIIX4 models.
  87                  */
  88
  89                 /*
  90                  * BM-IDE
  91                  * ------
  92                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
  93                  * Status register address.  We'll use this later to read
  94                  * each IDE controller's DMA status to make sure we catch all
  95                  * DMA activity.
  96                  */
  97                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
  98                                      PCI_DEVICE_ID_INTEL_82371AB,
  99                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 100                 if (dev) {
 101                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 102                         pci_dev_put(dev);
 103                 }
 104
 105                 /*
 106                  * Type-F DMA
 107                  * ----------
 108                  * Find the PIIX4 ISA Controller and read the Motherboard
 109                  * DMA controller's status to see if Type-F (Fast) DMA mode
 110                  * is enabled (bit 7) on either channel.  Note that we'll
 111                  * disable C3 support if this is enabled, as some legacy
 112                  * devices won't operate well if fast DMA is disabled.
 113                  */
 114                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 115                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 116                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 117                 if (dev) {
 118                         pci_read_config_byte(dev, 0x76, &value1);
 119                         pci_read_config_byte(dev, 0x77, &value2);
 120                         if ((value1 & 0x80) || (value2 & 0x80))
 121                                 errata.piix4.fdma = 1;
 122                         pci_dev_put(dev);
 123                 }
 124
 125                 break;
 126         }
 127
 128         if (errata.piix4.bmisx)
 129                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 130                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 131         if (errata.piix4.fdma)
 132                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 133                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 134
 135         return 0;
 136 }
 137
 138 static int acpi_processor_errata(void)
 139 {
 140         int result = 0;
 141         struct pci_dev *dev = NULL;
 142
 143         /*
 144          * PIIX4
 145          */
 146         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 147                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 148                              PCI_ANY_ID, NULL);
 149         if (dev) {
 150                 result = acpi_processor_errata_piix4(dev);
 151                 pci_dev_put(dev);
 152         }
 153
 154         return result;
 155 }
 156
 157 /* Initialization */
 158 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 159 int __weak acpi_map_cpu(acpi_handle handle,
 160                 phys_cpuid_t physid, u32 acpi_id, int *pcpu)
 161 {
 162         return -ENODEV;
 163 }
 164
 165 int __weak acpi_unmap_cpu(int cpu)
 166 {
 167         return -ENODEV;
 168 }
 169
 170 int __weak arch_register_cpu(int cpu)
 171 {
 172         return -ENODEV;
 173 }
 174
 175 void __weak arch_unregister_cpu(int cpu) {}
 176
 177 static int acpi_processor_hotadd_init(struct acpi_processor *pr)
 178 {
 179         unsigned long long sta;
 180         acpi_status status;
 181         int ret;
 182
 183         if (invalid_phys_cpuid(pr->phys_id))
 184                 return -ENODEV;
 185
 186         status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
 187         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
 188                 return -ENODEV;
 189
 190         cpu_maps_update_begin();
 191         cpu_hotplug_begin();
 192
 193         ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
 194         if (ret)
 195                 goto out;
 196
 197         ret = arch_register_cpu(pr->id);
 198         if (ret) {
 199                 acpi_unmap_cpu(pr->id);
 200                 goto out;
 201         }
 202
 203         /*
 204          * CPU got hot-added, but cpu_data is not initialized yet.  Set a flag
 205          * to delay cpu_idle/throttling initialization and do it when the CPU
 206          * gets online for the first time.
 207          */
 208         pr_info("CPU%d has been hot-added\n", pr->id);
 209         pr->flags.need_hotplug_init = 1;
 210
 211 out:
 212         cpu_hotplug_done();
 213         cpu_maps_update_done();
 214         return ret;
 215 }
 216 #else
 217 static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
 218 {
 219         return -ENODEV;
 220 }
 221 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 222
 223 static int acpi_processor_get_info(struct acpi_device *device)
 224 {
 225         union acpi_object object = { 0 };
 226         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 227         struct acpi_processor *pr = acpi_driver_data(device);
 228         int device_declaration = 0;
 229         acpi_status status = AE_OK;
 230         static int cpu0_initialized;
 231         unsigned long long value;
 232
 233         acpi_processor_errata();
 234
 235         /*
 236          * Check to see if we have bus mastering arbitration control.  This
 237          * is required for proper C3 usage (to maintain cache coherency).
 238          */
 239         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 240                 pr->flags.bm_control = 1;
 241                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 242                                   "Bus mastering arbitration control present\n"));
 243         } else
 244                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 245                                   "No bus mastering arbitration control\n"));
 246
 247         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 248                 /* Declared with "Processor" statement; match ProcessorID */
 249                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 250                 if (ACPI_FAILURE(status)) {
 251                         dev_err(&device->dev,
 252                                 "Failed to evaluate processor object (0x%x)\n",
 253                                 status);
 254                         return -ENODEV;
 255                 }
 256
 257                 pr->acpi_id = object.processor.proc_id;
 258         } else {
 259                 /*
 260                  * Declared with "Device" statement; match _UID.
 261                  */
 262                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 263                                                 NULL, &value);
 264                 if (ACPI_FAILURE(status)) {
 265                         dev_err(&device->dev,
 266                                 "Failed to evaluate processor _UID (0x%x)\n",
 267                                 status);
 268                         return -ENODEV;
 269                 }
 270                 device_declaration = 1;
 271                 pr->acpi_id = value;
 272         }
 273
 274         if (acpi_duplicate_processor_id(pr->acpi_id)) {
 275                 if (pr->acpi_id == 0xff)
 276                         dev_info_once(&device->dev,
 277                                 "Entry not well-defined, consider updating BIOS\n");
 278                 else
 279                         dev_err(&device->dev,
 280                                 "Failed to get unique processor _UID (0x%x)\n",
 281                                 pr->acpi_id);
 282                 return -ENODEV;
 283         }
 284
 285         pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
 286                                         pr->acpi_id);
 287         if (invalid_phys_cpuid(pr->phys_id))
 288                 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
 289
 290         pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
 291         if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
 292                 cpu0_initialized = 1;
 293                 /*
 294                  * Handle UP system running SMP kernel, with no CPU
 295                  * entry in MADT
 296                  */
 297                 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
 298                         pr->id = 0;
 299         }
 300
 301         /*
 302          *  Extra Processor objects may be enumerated on MP systems with
 303          *  less than the max # of CPUs. They should be ignored _iff
 304          *  they are physically not present.
 305          *
 306          *  NOTE: Even if the processor has a cpuid, it may not be present
 307          *  because cpuid <-> apicid mapping is persistent now.
 308          */
 309         if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
 310                 int ret = acpi_processor_hotadd_init(pr);
 311
 312                 if (ret)
 313                         return ret;
 314         }
 315
 316         /*
 317          * On some boxes several processors use the same processor bus id.
 318          * But they are located in different scope. For example:
 319          * \_SB.SCK0.CPU0
 320          * \_SB.SCK1.CPU0
 321          * Rename the processor device bus id. And the new bus id will be
 322          * generated as the following format:
 323          * CPU+CPU ID.
 324          */
 325         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 326         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 327                           pr->acpi_id));
 328
 329         if (!object.processor.pblk_address)
 330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 331         else if (object.processor.pblk_length != 6)
 332                 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
 333                             object.processor.pblk_length);
 334         else {
 335                 pr->throttling.address = object.processor.pblk_address;
 336                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 337                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 338
 339                 pr->pblk = object.processor.pblk_address;
 340         }
 341
 342         /*
 343          * If ACPI describes a slot number for this CPU, we can use it to
 344          * ensure we get the right value in the "physical id" field
 345          * of /proc/cpuinfo
 346          */
 347         status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
 348         if (ACPI_SUCCESS(status))
 349                 arch_fix_phys_package_id(pr->id, value);
 350
 351         return 0;
 352 }
 353
 354 /*
 355  * Do not put anything in here which needs the core to be online.
 356  * For example MSR access or setting up things which check for cpuinfo_x86
 357  * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
 358  * Such things have to be put in and set up by the processor driver's .probe().
 359  */
 360 static DEFINE_PER_CPU(void *, processor_device_array);
 361
 362 static int acpi_processor_add(struct acpi_device *device,
 363                                         const struct acpi_device_id *id)
 364 {
 365         struct acpi_processor *pr;
 366         struct device *dev;
 367         int result = 0;
 368
 369         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 370         if (!pr)
 371                 return -ENOMEM;
 372
 373         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 374                 result = -ENOMEM;
 375                 goto err_free_pr;
 376         }
 377
 378         pr->handle = device->handle;
 379         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 380         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 381         device->driver_data = pr;
 382
 383         result = acpi_processor_get_info(device);
 384         if (result) /* Processor is not physically present or unavailable */
 385                 return 0;
 386
 387         BUG_ON(pr->id >= nr_cpu_ids);
 388
 389         /*
 390          * Buggy BIOS check.
 391          * ACPI id of processors can be reported wrongly by the BIOS.
 392          * Don't trust it blindly
 393          */
 394         if (per_cpu(processor_device_array, pr->id) != NULL &&
 395             per_cpu(processor_device_array, pr->id) != device) {
 396                 dev_warn(&device->dev,
 397                         "BIOS reported wrong ACPI id %d for the processor\n",
 398                         pr->id);
 399                 /* Give up, but do not abort the namespace scan. */
 400                 goto err;
 401         }
 402         /*
 403          * processor_device_array is not cleared on errors to allow buggy BIOS
 404          * checks.
 405          */
 406         per_cpu(processor_device_array, pr->id) = device;
 407         per_cpu(processors, pr->id) = pr;
 408
 409         dev = get_cpu_device(pr->id);
 410         if (!dev) {
 411                 result = -ENODEV;
 412                 goto err;
 413         }
 414
 415         result = acpi_bind_one(dev, device);
 416         if (result)
 417                 goto err;
 418
 419         pr->dev = dev;
 420
 421         /* Trigger the processor driver's .probe() if present. */
 422         if (device_attach(dev) >= 0)
 423                 return 1;
 424
 425         dev_err(dev, "Processor driver could not be attached\n");
 426         acpi_unbind_one(dev);
 427
 428  err:
 429         free_cpumask_var(pr->throttling.shared_cpu_map);
 430         device->driver_data = NULL;
 431         per_cpu(processors, pr->id) = NULL;
 432  err_free_pr:
 433         kfree(pr);
 434         return result;
 435 }
 436
 437 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 438 /* Removal */
 439 static void acpi_processor_remove(struct acpi_device *device)
 440 {
 441         struct acpi_processor *pr;
 442
 443         if (!device || !acpi_driver_data(device))
 444                 return;
 445
 446         pr = acpi_driver_data(device);
 447         if (pr->id >= nr_cpu_ids)
 448                 goto out;
 449
 450         /*
 451          * The only reason why we ever get here is CPU hot-removal.  The CPU is
 452          * already offline and the ACPI device removal locking prevents it from
 453          * being put back online at this point.
 454          *
 455          * Unbind the driver from the processor device and detach it from the
 456          * ACPI companion object.
 457          */
 458         device_release_driver(pr->dev);
 459         acpi_unbind_one(pr->dev);
 460
 461         /* Clean up. */
 462         per_cpu(processor_device_array, pr->id) = NULL;
 463         per_cpu(processors, pr->id) = NULL;
 464
 465         cpu_maps_update_begin();
 466         cpu_hotplug_begin();
 467
 468         /* Remove the CPU. */
 469         arch_unregister_cpu(pr->id);
 470         acpi_unmap_cpu(pr->id);
 471
 472         cpu_hotplug_done();
 473         cpu_maps_update_done();
 474
 475         try_offline_node(cpu_to_node(pr->id));
 476
 477  out:
 478         free_cpumask_var(pr->throttling.shared_cpu_map);
 479         kfree(pr);
 480 }
 481 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 482
 483 #ifdef CONFIG_X86
 484 static bool acpi_hwp_native_thermal_lvt_set;
 485 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
 486                                                           u32 lvl,
 487                                                           void *context,
 488                                                           void **rv)
 489 {
 490         u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
 491         u32 capbuf[2];
 492         struct acpi_osc_context osc_context = {
 493                 .uuid_str = sb_uuid_str,
 494                 .rev = 1,
 495                 .cap.length = 8,
 496                 .cap.pointer = capbuf,
 497         };
 498
 499         if (acpi_hwp_native_thermal_lvt_set)
 500                 return AE_CTRL_TERMINATE;
 501
 502         capbuf[0] = 0x0000;
 503         capbuf[1] = 0x1000; /* set bit 12 */
 504
 505         if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
 506                 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
 507                         u32 *capbuf_ret = osc_context.ret.pointer;
 508
 509                         if (capbuf_ret[1] & 0x1000) {
 510                                 acpi_handle_info(handle,
 511                                         "_OSC native thermal LVT Acked\n");
 512                                 acpi_hwp_native_thermal_lvt_set = true;
 513                         }
 514                 }
 515                 kfree(osc_context.ret.pointer);
 516         }
 517
 518         return AE_OK;
 519 }
 520
 521 void __init acpi_early_processor_osc(void)
 522 {
 523         if (boot_cpu_has(X86_FEATURE_HWP)) {
 524                 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 525                                     ACPI_UINT32_MAX,
 526                                     acpi_hwp_native_thermal_lvt_osc,
 527                                     NULL, NULL, NULL);
 528                 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
 529                                  acpi_hwp_native_thermal_lvt_osc,
 530                                  NULL, NULL);
 531         }
 532 }
 533 #endif
 534
 535 /*
 536  * The following ACPI IDs are known to be suitable for representing as
 537  * processor devices.
 538  */
 539 static const struct acpi_device_id processor_device_ids[] = {
 540
 541         { ACPI_PROCESSOR_OBJECT_HID, },
 542         { ACPI_PROCESSOR_DEVICE_HID, },
 543
 544         { }
 545 };
 546
 547 static struct acpi_scan_handler processor_handler = {
 548         .ids = processor_device_ids,
 549         .attach = acpi_processor_add,
 550 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 551         .detach = acpi_processor_remove,
 552 #endif
 553         .hotplug = {
 554                 .enabled = true,
 555         },
 556 };
 557
 558 static int acpi_processor_container_attach(struct acpi_device *dev,
 559                                            const struct acpi_device_id *id)
 560 {
 561         return 1;
 562 }
 563
 564 static const struct acpi_device_id processor_container_ids[] = {
 565         { ACPI_PROCESSOR_CONTAINER_HID, },
 566         { }
 567 };
 568
 569 static struct acpi_scan_handler processor_container_handler = {
 570         .ids = processor_container_ids,
 571         .attach = acpi_processor_container_attach,
 572 };
 573
 574 /* The number of the unique processor IDs */
 575 static int nr_unique_ids __initdata;
 576
 577 /* The number of the duplicate processor IDs */
 578 static int nr_duplicate_ids;
 579
 580 /* Used to store the unique processor IDs */
 581 static int unique_processor_ids[] __initdata = {
 582         [0 ... NR_CPUS - 1] = -1,
 583 };
 584
 585 /* Used to store the duplicate processor IDs */
 586 static int duplicate_processor_ids[] = {
 587         [0 ... NR_CPUS - 1] = -1,
 588 };
 589
 590 static void __init processor_validated_ids_update(int proc_id)
 591 {
 592         int i;
 593
 594         if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
 595                 return;
 596
 597         /*
 598          * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
 599          * already in the IDs, do nothing.
 600          */
 601         for (i = 0; i < nr_duplicate_ids; i++) {
 602                 if (duplicate_processor_ids[i] == proc_id)
 603                         return;
 604         }
 605
 606         /*
 607          * Secondly, compare the proc_id with unique IDs, if the proc_id is in
 608          * the IDs, put it in the duplicate IDs.
 609          */
 610         for (i = 0; i < nr_unique_ids; i++) {
 611                 if (unique_processor_ids[i] == proc_id) {
 612                         duplicate_processor_ids[nr_duplicate_ids] = proc_id;
 613                         nr_duplicate_ids++;
 614                         return;
 615                 }
 616         }
 617
 618         /*
 619          * Lastly, the proc_id is a unique ID, put it in the unique IDs.
 620          */
 621         unique_processor_ids[nr_unique_ids] = proc_id;
 622         nr_unique_ids++;
 623 }
 624
 625 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
 626                                                   u32 lvl,
 627                                                   void *context,
 628                                                   void **rv)
 629 {
 630         acpi_status status;
 631         acpi_object_type acpi_type;
 632         unsigned long long uid;
 633         union acpi_object object = { 0 };
 634         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 635
 636         status = acpi_get_type(handle, &acpi_type);
 637         if (ACPI_FAILURE(status))
 638                 return status;
 639
 640         switch (acpi_type) {
 641         case ACPI_TYPE_PROCESSOR:
 642                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 643                 if (ACPI_FAILURE(status))
 644                         goto err;
 645                 uid = object.processor.proc_id;
 646                 break;
 647
 648         case ACPI_TYPE_DEVICE:
 649                 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
 650                 if (ACPI_FAILURE(status))
 651                         goto err;
 652                 break;
 653         default:
 654                 goto err;
 655         }
 656
 657         processor_validated_ids_update(uid);
 658         return AE_OK;
 659
 660 err:
 661         /* Exit on error, but don't abort the namespace walk */
 662         acpi_handle_info(handle, "Invalid processor object\n");
 663         return AE_OK;
 664
 665 }
 666
 667 static void __init acpi_processor_check_duplicates(void)
 668 {
 669         /* check the correctness for all processors in ACPI namespace */
 670         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 671                                                 ACPI_UINT32_MAX,
 672                                                 acpi_processor_ids_walk,
 673                                                 NULL, NULL, NULL);
 674         acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
 675                                                 NULL, NULL);
 676 }
 677
 678 bool acpi_duplicate_processor_id(int proc_id)
 679 {
 680         int i;
 681
 682         /*
 683          * compare the proc_id with duplicate IDs, if the proc_id is already
 684          * in the duplicate IDs, return true, otherwise, return false.
 685          */
 686         for (i = 0; i < nr_duplicate_ids; i++) {
 687                 if (duplicate_processor_ids[i] == proc_id)
 688                         return true;
 689         }
 690         return false;
 691 }
 692
 693 void __init acpi_processor_init(void)
 694 {
 695         acpi_processor_check_duplicates();
 696         acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
 697         acpi_scan_add_handler(&processor_container_handler);
 698 }
 699
 700 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE
 701 /**
 702  * acpi_processor_claim_cst_control - Request _CST control from the platform.
 703  */
 704 bool acpi_processor_claim_cst_control(void)
 705 {
 706         static bool cst_control_claimed;
 707         acpi_status status;
 708
 709         if (!acpi_gbl_FADT.cst_control || cst_control_claimed)
 710                 return true;
 711
 712         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 713                                     acpi_gbl_FADT.cst_control, 8);
 714         if (ACPI_FAILURE(status)) {
 715                 pr_warn("ACPI: Failed to claim processor _CST control\n");
 716                 return false;
 717         }
 718
 719         cst_control_claimed = true;
 720         return true;
 721 }
 722 EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control);
 723
 724 /**
 725  * acpi_processor_evaluate_cst - Evaluate the processor _CST control method.
 726  * @handle: ACPI handle of the processor object containing the _CST.
 727  * @cpu: The numeric ID of the target CPU.
 728  * @info: Object write the C-states information into.
 729  *
 730  * Extract the C-state information for the given CPU from the output of the _CST
 731  * control method under the corresponding ACPI processor object (or processor
 732  * device object) and populate @info with it.
 733  *
 734  * If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke
 735  * acpi_processor_ffh_cstate_probe() to verify them and update the
 736  * cpu_cstate_entry data for @cpu.
 737  */
 738 int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu,
 739                                 struct acpi_processor_power *info)
 740 {
 741         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 742         union acpi_object *cst;
 743         acpi_status status;
 744         u64 count;
 745         int last_index = 0;
 746         int i, ret = 0;
 747
 748         status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
 749         if (ACPI_FAILURE(status)) {
 750                 acpi_handle_debug(handle, "No _CST\n");
 751                 return -ENODEV;
 752         }
 753
 754         cst = buffer.pointer;
 755
 756         /* There must be at least 2 elements. */
 757         if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) {
 758                 acpi_handle_warn(handle, "Invalid _CST output\n");
 759                 ret = -EFAULT;
 760                 goto end;
 761         }
 762
 763         count = cst->package.elements[0].integer.value;
 764
 765         /* Validate the number of C-states. */
 766         if (count < 1 || count != cst->package.count - 1) {
 767                 acpi_handle_warn(handle, "Inconsistent _CST data\n");
 768                 ret = -EFAULT;
 769                 goto end;
 770         }
 771
 772         for (i = 1; i <= count; i++) {
 773                 union acpi_object *element;
 774                 union acpi_object *obj;
 775                 struct acpi_power_register *reg;
 776                 struct acpi_processor_cx cx;
 777
 778                 /*
 779                  * If there is not enough space for all C-states, skip the
 780                  * excess ones and log a warning.
 781                  */
 782                 if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) {
 783                         acpi_handle_warn(handle,
 784                                          "No room for more idle states (limit: %d)\n",
 785                                          ACPI_PROCESSOR_MAX_POWER - 1);
 786                         break;
 787                 }
 788
 789                 memset(&cx, 0, sizeof(cx));
 790
 791                 element = &cst->package.elements[i];
 792                 if (element->type != ACPI_TYPE_PACKAGE) {
 793                         acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n",
 794                                          i, element->type);
 795                         continue;
 796                 }
 797
 798                 if (element->package.count != 4) {
 799                         acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n",
 800                                          i, element->package.count);
 801                         continue;
 802                 }
 803
 804                 obj = &element->package.elements[0];
 805
 806                 if (obj->type != ACPI_TYPE_BUFFER) {
 807                         acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n",
 808                                          i, obj->type);
 809                         continue;
 810                 }
 811
 812                 reg = (struct acpi_power_register *)obj->buffer.pointer;
 813
 814                 obj = &element->package.elements[1];
 815                 if (obj->type != ACPI_TYPE_INTEGER) {
 816                         acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n",
 817                                          i, obj->type);
 818                         continue;
 819                 }
 820
 821                 cx.type = obj->integer.value;
 822                 /*
 823                  * There are known cases in which the _CST output does not
 824                  * contain C1, so if the type of the first state found is not
 825                  * C1, leave an empty slot for C1 to be filled in later.
 826                  */
 827                 if (i == 1 && cx.type != ACPI_STATE_C1)
 828                         last_index = 1;
 829
 830                 cx.address = reg->address;
 831                 cx.index = last_index + 1;
 832
 833                 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
 834                         if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) {
 835                                 /*
 836                                  * In the majority of cases _CST describes C1 as
 837                                  * a FIXED_HARDWARE C-state, but if the command
 838                                  * line forbids using MWAIT, use CSTATE_HALT for
 839                                  * C1 regardless.
 840                                  */
 841                                 if (cx.type == ACPI_STATE_C1 &&
 842                                     boot_option_idle_override == IDLE_NOMWAIT) {
 843                                         cx.entry_method = ACPI_CSTATE_HALT;
 844                                         snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
 845                                 } else {
 846                                         cx.entry_method = ACPI_CSTATE_FFH;
 847                                 }
 848                         } else if (cx.type == ACPI_STATE_C1) {
 849                                 /*
 850                                  * In the special case of C1, FIXED_HARDWARE can
 851                                  * be handled by executing the HLT instruction.
 852                                  */
 853                                 cx.entry_method = ACPI_CSTATE_HALT;
 854                                 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
 855                         } else {
 856                                 acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n",
 857                                                  i);
 858                                 continue;
 859                         }
 860                 } else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
 861                         cx.entry_method = ACPI_CSTATE_SYSTEMIO;
 862                         snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
 863                                  cx.address);
 864                 } else {
 865                         acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n",
 866                                          i, reg->space_id);
 867                         continue;
 868                 }
 869
 870                 if (cx.type == ACPI_STATE_C1)
 871                         cx.valid = 1;
 872
 873                 obj = &element->package.elements[2];
 874                 if (obj->type != ACPI_TYPE_INTEGER) {
 875                         acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n",
 876                                          i, obj->type);
 877                         continue;
 878                 }
 879
 880                 cx.latency = obj->integer.value;
 881
 882                 obj = &element->package.elements[3];
 883                 if (obj->type != ACPI_TYPE_INTEGER) {
 884                         acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n",
 885                                          i, obj->type);
 886                         continue;
 887                 }
 888
 889                 memcpy(&info->states[++last_index], &cx, sizeof(cx));
 890         }
 891
 892         acpi_handle_info(handle, "Found %d idle states\n", last_index);
 893
 894         info->count = last_index;
 895
 896 end:
 897         kfree(buffer.pointer);
 898
 899         return ret;
 900 }
 901 EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst);
 902 #endif /* CONFIG_ACPI_PROCESSOR_CSTATE */