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 <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> 8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 9 * Copyright (C) 2013, Intel Corporation 10 * Rafael J. Wysocki <rafael.j.wysocki@intel.com> 11 */ 12#define pr_fmt(fmt) "ACPI: " fmt 13 14#include <linux/acpi.h> 15#include <linux/cpu.h> 16#include <linux/device.h> 17#include <linux/dmi.h> 18#include <linux/kernel.h> 19#include <linux/module.h> 20#include <linux/pci.h> 21#include <linux/platform_device.h> 22 23#include <acpi/processor.h> 24 25#include <asm/cpu.h> 26 27#include <xen/xen.h> 28 29#include "internal.h" 30 31DEFINE_PER_CPU(struct acpi_processor *, processors); 32EXPORT_PER_CPU_SYMBOL(processors); 33 34/* Errata Handling */ 35struct acpi_processor_errata errata __read_mostly; 36EXPORT_SYMBOL_GPL(errata); 37 38static int acpi_processor_errata_piix4(struct pci_dev *dev) 39{ 40 u8 value1 = 0; 41 u8 value2 = 0; 42 43 44 if (!dev) 45 return -EINVAL; 46 47 /* 48 * Note that 'dev' references the PIIX4 ACPI Controller. 49 */ 50 51 switch (dev->revision) { 52 case 0: 53 dev_dbg(&dev->dev, "Found PIIX4 A-step\n"); 54 break; 55 case 1: 56 dev_dbg(&dev->dev, "Found PIIX4 B-step\n"); 57 break; 58 case 2: 59 dev_dbg(&dev->dev, "Found PIIX4E\n"); 60 break; 61 case 3: 62 dev_dbg(&dev->dev, "Found PIIX4M\n"); 63 break; 64 default: 65 dev_dbg(&dev->dev, "Found unknown PIIX4\n"); 66 break; 67 } 68 69 switch (dev->revision) { 70 71 case 0: /* PIIX4 A-step */ 72 case 1: /* PIIX4 B-step */ 73 /* 74 * See specification changes #13 ("Manual Throttle Duty Cycle") 75 * and #14 ("Enabling and Disabling Manual Throttle"), plus 76 * erratum #5 ("STPCLK# Deassertion Time") from the January 77 * 2002 PIIX4 specification update. Applies to only older 78 * PIIX4 models. 79 */ 80 errata.piix4.throttle = 1; 81 fallthrough; 82 83 case 2: /* PIIX4E */ 84 case 3: /* PIIX4M */ 85 /* 86 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 87 * Livelock") from the January 2002 PIIX4 specification update. 88 * Applies to all PIIX4 models. 89 */ 90 91 /* 92 * BM-IDE 93 * ------ 94 * Find the PIIX4 IDE Controller and get the Bus Master IDE 95 * Status register address. We'll use this later to read 96 * each IDE controller's DMA status to make sure we catch all 97 * DMA activity. 98 */ 99 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 100 PCI_DEVICE_ID_INTEL_82371AB, 101 PCI_ANY_ID, PCI_ANY_ID, NULL); 102 if (dev) { 103 errata.piix4.bmisx = pci_resource_start(dev, 4); 104 pci_dev_put(dev); 105 } 106 107 /* 108 * Type-F DMA 109 * ---------- 110 * Find the PIIX4 ISA Controller and read the Motherboard 111 * DMA controller's status to see if Type-F (Fast) DMA mode 112 * is enabled (bit 7) on either channel. Note that we'll 113 * disable C3 support if this is enabled, as some legacy 114 * devices won't operate well if fast DMA is disabled. 115 */ 116 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 117 PCI_DEVICE_ID_INTEL_82371AB_0, 118 PCI_ANY_ID, PCI_ANY_ID, NULL); 119 if (dev) { 120 pci_read_config_byte(dev, 0x76, &value1); 121 pci_read_config_byte(dev, 0x77, &value2); 122 if ((value1 & 0x80) || (value2 & 0x80)) 123 errata.piix4.fdma = 1; 124 pci_dev_put(dev); 125 } 126 127 break; 128 } 129 130 if (errata.piix4.bmisx) 131 dev_dbg(&dev->dev, "Bus master activity detection (BM-IDE) erratum enabled\n"); 132 if (errata.piix4.fdma) 133 dev_dbg(&dev->dev, "Type-F DMA livelock erratum (C3 disabled)\n"); 134 135 return 0; 136} 137 138static 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/* Create a platform device to represent a CPU frequency control mechanism. */ 158static void cpufreq_add_device(const char *name) 159{ 160 struct platform_device *pdev; 161 162 pdev = platform_device_register_simple(name, PLATFORM_DEVID_NONE, NULL, 0); 163 if (IS_ERR(pdev)) 164 pr_info("%s device creation failed: %ld\n", name, PTR_ERR(pdev)); 165} 166 167#ifdef CONFIG_X86 168/* Check presence of Processor Clocking Control by searching for \_SB.PCCH. */ 169static void __init acpi_pcc_cpufreq_init(void) 170{ 171 acpi_status status; 172 acpi_handle handle; 173 174 status = acpi_get_handle(NULL, "\\_SB", &handle); 175 if (ACPI_FAILURE(status)) 176 return; 177 178 if (acpi_has_method(handle, "PCCH")) 179 cpufreq_add_device("pcc-cpufreq"); 180} 181#else 182static void __init acpi_pcc_cpufreq_init(void) {} 183#endif /* CONFIG_X86 */ 184 185/* Initialization */ 186#ifdef CONFIG_ACPI_HOTPLUG_CPU 187int __weak acpi_map_cpu(acpi_handle handle, 188 phys_cpuid_t physid, u32 acpi_id, int *pcpu) 189{ 190 return -ENODEV; 191} 192 193int __weak acpi_unmap_cpu(int cpu) 194{ 195 return -ENODEV; 196} 197 198int __weak arch_register_cpu(int cpu) 199{ 200 return -ENODEV; 201} 202 203void __weak arch_unregister_cpu(int cpu) {} 204 205static int acpi_processor_hotadd_init(struct acpi_processor *pr) 206{ 207 unsigned long long sta; 208 acpi_status status; 209 int ret; 210 211 if (invalid_phys_cpuid(pr->phys_id)) 212 return -ENODEV; 213 214 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); 215 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) 216 return -ENODEV; 217 218 cpu_maps_update_begin(); 219 cpus_write_lock(); 220 221 ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id); 222 if (ret) 223 goto out; 224 225 ret = arch_register_cpu(pr->id); 226 if (ret) { 227 acpi_unmap_cpu(pr->id); 228 goto out; 229 } 230 231 /* 232 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag 233 * to delay cpu_idle/throttling initialization and do it when the CPU 234 * gets online for the first time. 235 */ 236 pr_info("CPU%d has been hot-added\n", pr->id); 237 pr->flags.need_hotplug_init = 1; 238 239out: 240 cpus_write_unlock(); 241 cpu_maps_update_done(); 242 return ret; 243} 244#else 245static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) 246{ 247 return -ENODEV; 248} 249#endif /* CONFIG_ACPI_HOTPLUG_CPU */ 250 251static int acpi_processor_get_info(struct acpi_device *device) 252{ 253 union acpi_object object = { 0 }; 254 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 255 struct acpi_processor *pr = acpi_driver_data(device); 256 int device_declaration = 0; 257 acpi_status status = AE_OK; 258 static int cpu0_initialized; 259 unsigned long long value; 260 261 acpi_processor_errata(); 262 263 /* 264 * Check to see if we have bus mastering arbitration control. This 265 * is required for proper C3 usage (to maintain cache coherency). 266 */ 267 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 268 pr->flags.bm_control = 1; 269 dev_dbg(&device->dev, "Bus mastering arbitration control present\n"); 270 } else 271 dev_dbg(&device->dev, "No bus mastering arbitration control\n"); 272 273 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 274 /* Declared with "Processor" statement; match ProcessorID */ 275 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 276 if (ACPI_FAILURE(status)) { 277 dev_err(&device->dev, 278 "Failed to evaluate processor object (0x%x)\n", 279 status); 280 return -ENODEV; 281 } 282 283 pr->acpi_id = object.processor.proc_id; 284 } else { 285 /* 286 * Declared with "Device" statement; match _UID. 287 */ 288 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 289 NULL, &value); 290 if (ACPI_FAILURE(status)) { 291 dev_err(&device->dev, 292 "Failed to evaluate processor _UID (0x%x)\n", 293 status); 294 return -ENODEV; 295 } 296 device_declaration = 1; 297 pr->acpi_id = value; 298 } 299 300 if (acpi_duplicate_processor_id(pr->acpi_id)) { 301 if (pr->acpi_id == 0xff) 302 dev_info_once(&device->dev, 303 "Entry not well-defined, consider updating BIOS\n"); 304 else 305 dev_err(&device->dev, 306 "Failed to get unique processor _UID (0x%x)\n", 307 pr->acpi_id); 308 return -ENODEV; 309 } 310 311 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration, 312 pr->acpi_id); 313 if (invalid_phys_cpuid(pr->phys_id)) 314 dev_dbg(&device->dev, "Failed to get CPU physical ID.\n"); 315 316 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id); 317 if (!cpu0_initialized) { 318 cpu0_initialized = 1; 319 /* 320 * Handle UP system running SMP kernel, with no CPU 321 * entry in MADT 322 */ 323 if (!acpi_has_cpu_in_madt() && invalid_logical_cpuid(pr->id) && 324 (num_online_cpus() == 1)) 325 pr->id = 0; 326 /* 327 * Check availability of Processor Performance Control by 328 * looking at the presence of the _PCT object under the first 329 * processor definition. 330 */ 331 if (acpi_has_method(pr->handle, "_PCT")) 332 cpufreq_add_device("acpi-cpufreq"); 333 } 334 335 /* 336 * Extra Processor objects may be enumerated on MP systems with 337 * less than the max # of CPUs. They should be ignored _iff 338 * they are physically not present. 339 * 340 * NOTE: Even if the processor has a cpuid, it may not be present 341 * because cpuid <-> apicid mapping is persistent now. 342 */ 343 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { 344 int ret = acpi_processor_hotadd_init(pr); 345 346 if (ret) 347 return ret; 348 } 349 350 /* 351 * On some boxes several processors use the same processor bus id. 352 * But they are located in different scope. For example: 353 * \_SB.SCK0.CPU0 354 * \_SB.SCK1.CPU0 355 * Rename the processor device bus id. And the new bus id will be 356 * generated as the following format: 357 * CPU+CPU ID. 358 */ 359 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 360 dev_dbg(&device->dev, "Processor [%d:%d]\n", pr->id, pr->acpi_id); 361 362 if (!object.processor.pblk_address) 363 dev_dbg(&device->dev, "No PBLK (NULL address)\n"); 364 else if (object.processor.pblk_length != 6) 365 dev_err(&device->dev, "Invalid PBLK length [%d]\n", 366 object.processor.pblk_length); 367 else { 368 pr->throttling.address = object.processor.pblk_address; 369 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 370 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 371 372 pr->pblk = object.processor.pblk_address; 373 } 374 375 /* 376 * If ACPI describes a slot number for this CPU, we can use it to 377 * ensure we get the right value in the "physical id" field 378 * of /proc/cpuinfo 379 */ 380 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value); 381 if (ACPI_SUCCESS(status)) 382 arch_fix_phys_package_id(pr->id, value); 383 384 return 0; 385} 386 387/* 388 * Do not put anything in here which needs the core to be online. 389 * For example MSR access or setting up things which check for cpuinfo_x86 390 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. 391 * Such things have to be put in and set up by the processor driver's .probe(). 392 */ 393static DEFINE_PER_CPU(void *, processor_device_array); 394 395static int acpi_processor_add(struct acpi_device *device, 396 const struct acpi_device_id *id) 397{ 398 struct acpi_processor *pr; 399 struct device *dev; 400 int result = 0; 401 402 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 403 if (!pr) 404 return -ENOMEM; 405 406 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 407 result = -ENOMEM; 408 goto err_free_pr; 409 } 410 411 pr->handle = device->handle; 412 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 413 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 414 device->driver_data = pr; 415 416 result = acpi_processor_get_info(device); 417 if (result) /* Processor is not physically present or unavailable */ 418 return 0; 419 420 BUG_ON(pr->id >= nr_cpu_ids); 421 422 /* 423 * Buggy BIOS check. 424 * ACPI id of processors can be reported wrongly by the BIOS. 425 * Don't trust it blindly 426 */ 427 if (per_cpu(processor_device_array, pr->id) != NULL && 428 per_cpu(processor_device_array, pr->id) != device) { 429 dev_warn(&device->dev, 430 "BIOS reported wrong ACPI id %d for the processor\n", 431 pr->id); 432 /* Give up, but do not abort the namespace scan. */ 433 goto err; 434 } 435 /* 436 * processor_device_array is not cleared on errors to allow buggy BIOS 437 * checks. 438 */ 439 per_cpu(processor_device_array, pr->id) = device; 440 per_cpu(processors, pr->id) = pr; 441 442 dev = get_cpu_device(pr->id); 443 if (!dev) { 444 result = -ENODEV; 445 goto err; 446 } 447 448 result = acpi_bind_one(dev, device); 449 if (result) 450 goto err; 451 452 pr->dev = dev; 453 454 /* Trigger the processor driver's .probe() if present. */ 455 if (device_attach(dev) >= 0) 456 return 1; 457 458 dev_err(dev, "Processor driver could not be attached\n"); 459 acpi_unbind_one(dev); 460 461 err: 462 free_cpumask_var(pr->throttling.shared_cpu_map); 463 device->driver_data = NULL; 464 per_cpu(processors, pr->id) = NULL; 465 err_free_pr: 466 kfree(pr); 467 return result; 468} 469 470#ifdef CONFIG_ACPI_HOTPLUG_CPU 471/* Removal */ 472static void acpi_processor_remove(struct acpi_device *device) 473{ 474 struct acpi_processor *pr; 475 476 if (!device || !acpi_driver_data(device)) 477 return; 478 479 pr = acpi_driver_data(device); 480 if (pr->id >= nr_cpu_ids) 481 goto out; 482 483 /* 484 * The only reason why we ever get here is CPU hot-removal. The CPU is 485 * already offline and the ACPI device removal locking prevents it from 486 * being put back online at this point. 487 * 488 * Unbind the driver from the processor device and detach it from the 489 * ACPI companion object. 490 */ 491 device_release_driver(pr->dev); 492 acpi_unbind_one(pr->dev); 493 494 /* Clean up. */ 495 per_cpu(processor_device_array, pr->id) = NULL; 496 per_cpu(processors, pr->id) = NULL; 497 498 cpu_maps_update_begin(); 499 cpus_write_lock(); 500 501 /* Remove the CPU. */ 502 arch_unregister_cpu(pr->id); 503 acpi_unmap_cpu(pr->id); 504 505 cpus_write_unlock(); 506 cpu_maps_update_done(); 507 508 try_offline_node(cpu_to_node(pr->id)); 509 510 out: 511 free_cpumask_var(pr->throttling.shared_cpu_map); 512 kfree(pr); 513} 514#endif /* CONFIG_ACPI_HOTPLUG_CPU */ 515 516#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC 517bool __init processor_physically_present(acpi_handle handle) 518{ 519 int cpuid, type; 520 u32 acpi_id; 521 acpi_status status; 522 acpi_object_type acpi_type; 523 unsigned long long tmp; 524 union acpi_object object = {}; 525 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 526 527 status = acpi_get_type(handle, &acpi_type); 528 if (ACPI_FAILURE(status)) 529 return false; 530 531 switch (acpi_type) { 532 case ACPI_TYPE_PROCESSOR: 533 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 534 if (ACPI_FAILURE(status)) 535 return false; 536 acpi_id = object.processor.proc_id; 537 break; 538 case ACPI_TYPE_DEVICE: 539 status = acpi_evaluate_integer(handle, METHOD_NAME__UID, 540 NULL, &tmp); 541 if (ACPI_FAILURE(status)) 542 return false; 543 acpi_id = tmp; 544 break; 545 default: 546 return false; 547 } 548 549 if (xen_initial_domain()) 550 /* 551 * When running as a Xen dom0 the number of processors Linux 552 * sees can be different from the real number of processors on 553 * the system, and we still need to execute _PDC or _OSC for 554 * all of them. 555 */ 556 return xen_processor_present(acpi_id); 557 558 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 559 cpuid = acpi_get_cpuid(handle, type, acpi_id); 560 561 return !invalid_logical_cpuid(cpuid); 562} 563 564/* vendor specific UUID indicating an Intel platform */ 565static u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; 566 567static acpi_status __init acpi_processor_osc(acpi_handle handle, u32 lvl, 568 void *context, void **rv) 569{ 570 u32 capbuf[2] = {}; 571 struct acpi_osc_context osc_context = { 572 .uuid_str = sb_uuid_str, 573 .rev = 1, 574 .cap.length = 8, 575 .cap.pointer = capbuf, 576 }; 577 acpi_status status; 578 579 if (!processor_physically_present(handle)) 580 return AE_OK; 581 582 arch_acpi_set_proc_cap_bits(&capbuf[OSC_SUPPORT_DWORD]); 583 584 status = acpi_run_osc(handle, &osc_context); 585 if (ACPI_FAILURE(status)) 586 return status; 587 588 kfree(osc_context.ret.pointer); 589 590 return AE_OK; 591} 592 593static bool __init acpi_early_processor_osc(void) 594{ 595 acpi_status status; 596 597 acpi_proc_quirk_mwait_check(); 598 599 status = acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 600 ACPI_UINT32_MAX, acpi_processor_osc, NULL, 601 NULL, NULL); 602 if (ACPI_FAILURE(status)) 603 return false; 604 605 status = acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_osc, 606 NULL, NULL); 607 if (ACPI_FAILURE(status)) 608 return false; 609 610 return true; 611} 612 613void __init acpi_early_processor_control_setup(void) 614{ 615 if (acpi_early_processor_osc()) { 616 pr_info("_OSC evaluated successfully for all CPUs\n"); 617 } else { 618 pr_info("_OSC evaluation for CPUs failed, trying _PDC\n"); 619 acpi_early_processor_set_pdc(); 620 } 621} 622#endif 623 624/* 625 * The following ACPI IDs are known to be suitable for representing as 626 * processor devices. 627 */ 628static const struct acpi_device_id processor_device_ids[] = { 629 630 { ACPI_PROCESSOR_OBJECT_HID, }, 631 { ACPI_PROCESSOR_DEVICE_HID, }, 632 633 { } 634}; 635 636static struct acpi_scan_handler processor_handler = { 637 .ids = processor_device_ids, 638 .attach = acpi_processor_add, 639#ifdef CONFIG_ACPI_HOTPLUG_CPU 640 .detach = acpi_processor_remove, 641#endif 642 .hotplug = { 643 .enabled = true, 644 }, 645}; 646 647static int acpi_processor_container_attach(struct acpi_device *dev, 648 const struct acpi_device_id *id) 649{ 650 return 1; 651} 652 653static const struct acpi_device_id processor_container_ids[] = { 654 { ACPI_PROCESSOR_CONTAINER_HID, }, 655 { } 656}; 657 658static struct acpi_scan_handler processor_container_handler = { 659 .ids = processor_container_ids, 660 .attach = acpi_processor_container_attach, 661}; 662 663/* The number of the unique processor IDs */ 664static int nr_unique_ids __initdata; 665 666/* The number of the duplicate processor IDs */ 667static int nr_duplicate_ids; 668 669/* Used to store the unique processor IDs */ 670static int unique_processor_ids[] __initdata = { 671 [0 ... NR_CPUS - 1] = -1, 672}; 673 674/* Used to store the duplicate processor IDs */ 675static int duplicate_processor_ids[] = { 676 [0 ... NR_CPUS - 1] = -1, 677}; 678 679static void __init processor_validated_ids_update(int proc_id) 680{ 681 int i; 682 683 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS) 684 return; 685 686 /* 687 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is 688 * already in the IDs, do nothing. 689 */ 690 for (i = 0; i < nr_duplicate_ids; i++) { 691 if (duplicate_processor_ids[i] == proc_id) 692 return; 693 } 694 695 /* 696 * Secondly, compare the proc_id with unique IDs, if the proc_id is in 697 * the IDs, put it in the duplicate IDs. 698 */ 699 for (i = 0; i < nr_unique_ids; i++) { 700 if (unique_processor_ids[i] == proc_id) { 701 duplicate_processor_ids[nr_duplicate_ids] = proc_id; 702 nr_duplicate_ids++; 703 return; 704 } 705 } 706 707 /* 708 * Lastly, the proc_id is a unique ID, put it in the unique IDs. 709 */ 710 unique_processor_ids[nr_unique_ids] = proc_id; 711 nr_unique_ids++; 712} 713 714static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, 715 u32 lvl, 716 void *context, 717 void **rv) 718{ 719 acpi_status status; 720 acpi_object_type acpi_type; 721 unsigned long long uid; 722 union acpi_object object = { 0 }; 723 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 724 725 status = acpi_get_type(handle, &acpi_type); 726 if (ACPI_FAILURE(status)) 727 return status; 728 729 switch (acpi_type) { 730 case ACPI_TYPE_PROCESSOR: 731 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 732 if (ACPI_FAILURE(status)) 733 goto err; 734 uid = object.processor.proc_id; 735 break; 736 737 case ACPI_TYPE_DEVICE: 738 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); 739 if (ACPI_FAILURE(status)) 740 goto err; 741 break; 742 default: 743 goto err; 744 } 745 746 processor_validated_ids_update(uid); 747 return AE_OK; 748 749err: 750 /* Exit on error, but don't abort the namespace walk */ 751 acpi_handle_info(handle, "Invalid processor object\n"); 752 return AE_OK; 753 754} 755 756static void __init acpi_processor_check_duplicates(void) 757{ 758 /* check the correctness for all processors in ACPI namespace */ 759 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 760 ACPI_UINT32_MAX, 761 acpi_processor_ids_walk, 762 NULL, NULL, NULL); 763 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, 764 NULL, NULL); 765} 766 767bool acpi_duplicate_processor_id(int proc_id) 768{ 769 int i; 770 771 /* 772 * compare the proc_id with duplicate IDs, if the proc_id is already 773 * in the duplicate IDs, return true, otherwise, return false. 774 */ 775 for (i = 0; i < nr_duplicate_ids; i++) { 776 if (duplicate_processor_ids[i] == proc_id) 777 return true; 778 } 779 return false; 780} 781 782void __init acpi_processor_init(void) 783{ 784 acpi_processor_check_duplicates(); 785 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); 786 acpi_scan_add_handler(&processor_container_handler); 787 acpi_pcc_cpufreq_init(); 788} 789 790#ifdef CONFIG_ACPI_PROCESSOR_CSTATE 791/** 792 * acpi_processor_claim_cst_control - Request _CST control from the platform. 793 */ 794bool acpi_processor_claim_cst_control(void) 795{ 796 static bool cst_control_claimed; 797 acpi_status status; 798 799 if (!acpi_gbl_FADT.cst_control || cst_control_claimed) 800 return true; 801 802 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 803 acpi_gbl_FADT.cst_control, 8); 804 if (ACPI_FAILURE(status)) { 805 pr_warn("ACPI: Failed to claim processor _CST control\n"); 806 return false; 807 } 808 809 cst_control_claimed = true; 810 return true; 811} 812EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control); 813 814/** 815 * acpi_processor_evaluate_cst - Evaluate the processor _CST control method. 816 * @handle: ACPI handle of the processor object containing the _CST. 817 * @cpu: The numeric ID of the target CPU. 818 * @info: Object write the C-states information into. 819 * 820 * Extract the C-state information for the given CPU from the output of the _CST 821 * control method under the corresponding ACPI processor object (or processor 822 * device object) and populate @info with it. 823 * 824 * If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke 825 * acpi_processor_ffh_cstate_probe() to verify them and update the 826 * cpu_cstate_entry data for @cpu. 827 */ 828int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, 829 struct acpi_processor_power *info) 830{ 831 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 832 union acpi_object *cst; 833 acpi_status status; 834 u64 count; 835 int last_index = 0; 836 int i, ret = 0; 837 838 status = acpi_evaluate_object(handle, "_CST", NULL, &buffer); 839 if (ACPI_FAILURE(status)) { 840 acpi_handle_debug(handle, "No _CST\n"); 841 return -ENODEV; 842 } 843 844 cst = buffer.pointer; 845 846 /* There must be at least 2 elements. */ 847 if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) { 848 acpi_handle_warn(handle, "Invalid _CST output\n"); 849 ret = -EFAULT; 850 goto end; 851 } 852 853 count = cst->package.elements[0].integer.value; 854 855 /* Validate the number of C-states. */ 856 if (count < 1 || count != cst->package.count - 1) { 857 acpi_handle_warn(handle, "Inconsistent _CST data\n"); 858 ret = -EFAULT; 859 goto end; 860 } 861 862 for (i = 1; i <= count; i++) { 863 union acpi_object *element; 864 union acpi_object *obj; 865 struct acpi_power_register *reg; 866 struct acpi_processor_cx cx; 867 868 /* 869 * If there is not enough space for all C-states, skip the 870 * excess ones and log a warning. 871 */ 872 if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) { 873 acpi_handle_warn(handle, 874 "No room for more idle states (limit: %d)\n", 875 ACPI_PROCESSOR_MAX_POWER - 1); 876 break; 877 } 878 879 memset(&cx, 0, sizeof(cx)); 880 881 element = &cst->package.elements[i]; 882 if (element->type != ACPI_TYPE_PACKAGE) { 883 acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n", 884 i, element->type); 885 continue; 886 } 887 888 if (element->package.count != 4) { 889 acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n", 890 i, element->package.count); 891 continue; 892 } 893 894 obj = &element->package.elements[0]; 895 896 if (obj->type != ACPI_TYPE_BUFFER) { 897 acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n", 898 i, obj->type); 899 continue; 900 } 901 902 reg = (struct acpi_power_register *)obj->buffer.pointer; 903 904 obj = &element->package.elements[1]; 905 if (obj->type != ACPI_TYPE_INTEGER) { 906 acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n", 907 i, obj->type); 908 continue; 909 } 910 911 cx.type = obj->integer.value; 912 /* 913 * There are known cases in which the _CST output does not 914 * contain C1, so if the type of the first state found is not 915 * C1, leave an empty slot for C1 to be filled in later. 916 */ 917 if (i == 1 && cx.type != ACPI_STATE_C1) 918 last_index = 1; 919 920 cx.address = reg->address; 921 cx.index = last_index + 1; 922 923 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 924 if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) { 925 /* 926 * In the majority of cases _CST describes C1 as 927 * a FIXED_HARDWARE C-state, but if the command 928 * line forbids using MWAIT, use CSTATE_HALT for 929 * C1 regardless. 930 */ 931 if (cx.type == ACPI_STATE_C1 && 932 boot_option_idle_override == IDLE_NOMWAIT) { 933 cx.entry_method = ACPI_CSTATE_HALT; 934 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 935 } else { 936 cx.entry_method = ACPI_CSTATE_FFH; 937 } 938 } else if (cx.type == ACPI_STATE_C1) { 939 /* 940 * In the special case of C1, FIXED_HARDWARE can 941 * be handled by executing the HLT instruction. 942 */ 943 cx.entry_method = ACPI_CSTATE_HALT; 944 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 945 } else { 946 acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n", 947 i); 948 continue; 949 } 950 } else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 951 cx.entry_method = ACPI_CSTATE_SYSTEMIO; 952 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 953 cx.address); 954 } else { 955 acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n", 956 i, reg->space_id); 957 continue; 958 } 959 960 if (cx.type == ACPI_STATE_C1) 961 cx.valid = 1; 962 963 obj = &element->package.elements[2]; 964 if (obj->type != ACPI_TYPE_INTEGER) { 965 acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n", 966 i, obj->type); 967 continue; 968 } 969 970 cx.latency = obj->integer.value; 971 972 obj = &element->package.elements[3]; 973 if (obj->type != ACPI_TYPE_INTEGER) { 974 acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n", 975 i, obj->type); 976 continue; 977 } 978 979 memcpy(&info->states[++last_index], &cx, sizeof(cx)); 980 } 981 982 acpi_handle_info(handle, "Found %d idle states\n", last_index); 983 984 info->count = last_index; 985 986end: 987 kfree(buffer.pointer); 988 989 return ret; 990} 991EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst); 992#endif /* CONFIG_ACPI_PROCESSOR_CSTATE */ 993