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: %pe\n", name, 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 187static int acpi_processor_hotadd_init(struct acpi_processor *pr) 188{ 189 unsigned long long sta; 190 acpi_status status; 191 int ret; 192 193 if (invalid_phys_cpuid(pr->phys_id)) 194 return -ENODEV; 195 196 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); 197 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) 198 return -ENODEV; 199 200 cpu_maps_update_begin(); 201 cpus_write_lock(); 202 203 ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id); 204 if (ret) 205 goto out; 206 207 ret = arch_register_cpu(pr->id); 208 if (ret) { 209 acpi_unmap_cpu(pr->id); 210 goto out; 211 } 212 213 /* 214 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag 215 * to delay cpu_idle/throttling initialization and do it when the CPU 216 * gets online for the first time. 217 */ 218 pr_info("CPU%d has been hot-added\n", pr->id); 219 pr->flags.need_hotplug_init = 1; 220 221out: 222 cpus_write_unlock(); 223 cpu_maps_update_done(); 224 return ret; 225} 226#else 227static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) 228{ 229 return -ENODEV; 230} 231#endif /* CONFIG_ACPI_HOTPLUG_CPU */ 232 233static int acpi_processor_get_info(struct acpi_device *device) 234{ 235 union acpi_object object = { 0 }; 236 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 237 struct acpi_processor *pr = acpi_driver_data(device); 238 int device_declaration = 0; 239 acpi_status status = AE_OK; 240 static int cpu0_initialized; 241 unsigned long long value; 242 243 acpi_processor_errata(); 244 245 /* 246 * Check to see if we have bus mastering arbitration control. This 247 * is required for proper C3 usage (to maintain cache coherency). 248 */ 249 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 250 pr->flags.bm_control = 1; 251 dev_dbg(&device->dev, "Bus mastering arbitration control present\n"); 252 } else 253 dev_dbg(&device->dev, "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 */ 270 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 271 NULL, &value); 272 if (ACPI_FAILURE(status)) { 273 dev_err(&device->dev, 274 "Failed to evaluate processor _UID (0x%x)\n", 275 status); 276 return -ENODEV; 277 } 278 device_declaration = 1; 279 pr->acpi_id = value; 280 } 281 282 if (acpi_duplicate_processor_id(pr->acpi_id)) { 283 if (pr->acpi_id == 0xff) 284 dev_info_once(&device->dev, 285 "Entry not well-defined, consider updating BIOS\n"); 286 else 287 dev_err(&device->dev, 288 "Failed to get unique processor _UID (0x%x)\n", 289 pr->acpi_id); 290 return -ENODEV; 291 } 292 293 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration, 294 pr->acpi_id); 295 if (invalid_phys_cpuid(pr->phys_id)) 296 dev_dbg(&device->dev, "Failed to get CPU physical ID.\n"); 297 298 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id); 299 if (!cpu0_initialized) { 300 cpu0_initialized = 1; 301 /* 302 * Handle UP system running SMP kernel, with no CPU 303 * entry in MADT 304 */ 305 if (!acpi_has_cpu_in_madt() && invalid_logical_cpuid(pr->id) && 306 (num_online_cpus() == 1)) 307 pr->id = 0; 308 /* 309 * Check availability of Processor Performance Control by 310 * looking at the presence of the _PCT object under the first 311 * processor definition. 312 */ 313 if (acpi_has_method(pr->handle, "_PCT")) 314 cpufreq_add_device("acpi-cpufreq"); 315 } 316 317 /* 318 * Extra Processor objects may be enumerated on MP systems with 319 * less than the max # of CPUs. They should be ignored _iff 320 * they are physically not present. 321 * 322 * NOTE: Even if the processor has a cpuid, it may not be present 323 * because cpuid <-> apicid mapping is persistent now. 324 */ 325 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { 326 int ret = acpi_processor_hotadd_init(pr); 327 328 if (ret) 329 return ret; 330 } 331 332 /* 333 * On some boxes several processors use the same processor bus id. 334 * But they are located in different scope. For example: 335 * \_SB.SCK0.CPU0 336 * \_SB.SCK1.CPU0 337 * Rename the processor device bus id. And the new bus id will be 338 * generated as the following format: 339 * CPU+CPU ID. 340 */ 341 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 342 dev_dbg(&device->dev, "Processor [%d:%d]\n", pr->id, pr->acpi_id); 343 344 if (!object.processor.pblk_address) 345 dev_dbg(&device->dev, "No PBLK (NULL address)\n"); 346 else if (object.processor.pblk_length != 6) 347 dev_err(&device->dev, "Invalid PBLK length [%d]\n", 348 object.processor.pblk_length); 349 else { 350 pr->throttling.address = object.processor.pblk_address; 351 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 352 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 353 354 pr->pblk = object.processor.pblk_address; 355 } 356 357 /* 358 * If ACPI describes a slot number for this CPU, we can use it to 359 * ensure we get the right value in the "physical id" field 360 * of /proc/cpuinfo 361 */ 362 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value); 363 if (ACPI_SUCCESS(status)) 364 arch_fix_phys_package_id(pr->id, value); 365 366 return 0; 367} 368 369/* 370 * Do not put anything in here which needs the core to be online. 371 * For example MSR access or setting up things which check for cpuinfo_x86 372 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. 373 * Such things have to be put in and set up by the processor driver's .probe(). 374 */ 375static DEFINE_PER_CPU(void *, processor_device_array); 376 377static int acpi_processor_add(struct acpi_device *device, 378 const struct acpi_device_id *id) 379{ 380 struct acpi_processor *pr; 381 struct device *dev; 382 int result = 0; 383 384 if (!acpi_device_is_enabled(device)) 385 return -ENODEV; 386 387 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 388 if (!pr) 389 return -ENOMEM; 390 391 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 392 result = -ENOMEM; 393 goto err_free_pr; 394 } 395 396 pr->handle = device->handle; 397 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 398 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 399 device->driver_data = pr; 400 401 result = acpi_processor_get_info(device); 402 if (result) /* Processor is not physically present or unavailable */ 403 return 0; 404 405 BUG_ON(pr->id >= nr_cpu_ids); 406 407 /* 408 * Buggy BIOS check. 409 * ACPI id of processors can be reported wrongly by the BIOS. 410 * Don't trust it blindly 411 */ 412 if (per_cpu(processor_device_array, pr->id) != NULL && 413 per_cpu(processor_device_array, pr->id) != device) { 414 dev_warn(&device->dev, 415 "BIOS reported wrong ACPI id %d for the processor\n", 416 pr->id); 417 /* Give up, but do not abort the namespace scan. */ 418 goto err; 419 } 420 /* 421 * processor_device_array is not cleared on errors to allow buggy BIOS 422 * checks. 423 */ 424 per_cpu(processor_device_array, pr->id) = device; 425 per_cpu(processors, pr->id) = pr; 426 427 dev = get_cpu_device(pr->id); 428 if (!dev) { 429 result = -ENODEV; 430 goto err; 431 } 432 433 result = acpi_bind_one(dev, device); 434 if (result) 435 goto err; 436 437 pr->dev = dev; 438 439 /* Trigger the processor driver's .probe() if present. */ 440 if (device_attach(dev) >= 0) 441 return 1; 442 443 dev_err(dev, "Processor driver could not be attached\n"); 444 acpi_unbind_one(dev); 445 446 err: 447 free_cpumask_var(pr->throttling.shared_cpu_map); 448 device->driver_data = NULL; 449 per_cpu(processors, pr->id) = NULL; 450 err_free_pr: 451 kfree(pr); 452 return result; 453} 454 455#ifdef CONFIG_ACPI_HOTPLUG_CPU 456/* Removal */ 457static void acpi_processor_remove(struct acpi_device *device) 458{ 459 struct acpi_processor *pr; 460 461 if (!device || !acpi_driver_data(device)) 462 return; 463 464 pr = acpi_driver_data(device); 465 if (pr->id >= nr_cpu_ids) 466 goto out; 467 468 /* 469 * The only reason why we ever get here is CPU hot-removal. The CPU is 470 * already offline and the ACPI device removal locking prevents it from 471 * being put back online at this point. 472 * 473 * Unbind the driver from the processor device and detach it from the 474 * ACPI companion object. 475 */ 476 device_release_driver(pr->dev); 477 acpi_unbind_one(pr->dev); 478 479 /* Clean up. */ 480 per_cpu(processor_device_array, pr->id) = NULL; 481 per_cpu(processors, pr->id) = NULL; 482 483 cpu_maps_update_begin(); 484 cpus_write_lock(); 485 486 /* Remove the CPU. */ 487 arch_unregister_cpu(pr->id); 488 acpi_unmap_cpu(pr->id); 489 490 cpus_write_unlock(); 491 cpu_maps_update_done(); 492 493 try_offline_node(cpu_to_node(pr->id)); 494 495 out: 496 free_cpumask_var(pr->throttling.shared_cpu_map); 497 kfree(pr); 498} 499#endif /* CONFIG_ACPI_HOTPLUG_CPU */ 500 501#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC 502bool __init processor_physically_present(acpi_handle handle) 503{ 504 int cpuid, type; 505 u32 acpi_id; 506 acpi_status status; 507 acpi_object_type acpi_type; 508 unsigned long long tmp; 509 union acpi_object object = {}; 510 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 511 512 status = acpi_get_type(handle, &acpi_type); 513 if (ACPI_FAILURE(status)) 514 return false; 515 516 switch (acpi_type) { 517 case ACPI_TYPE_PROCESSOR: 518 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 519 if (ACPI_FAILURE(status)) 520 return false; 521 acpi_id = object.processor.proc_id; 522 break; 523 case ACPI_TYPE_DEVICE: 524 status = acpi_evaluate_integer(handle, METHOD_NAME__UID, 525 NULL, &tmp); 526 if (ACPI_FAILURE(status)) 527 return false; 528 acpi_id = tmp; 529 break; 530 default: 531 return false; 532 } 533 534 if (xen_initial_domain()) 535 /* 536 * When running as a Xen dom0 the number of processors Linux 537 * sees can be different from the real number of processors on 538 * the system, and we still need to execute _PDC or _OSC for 539 * all of them. 540 */ 541 return xen_processor_present(acpi_id); 542 543 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 544 cpuid = acpi_get_cpuid(handle, type, acpi_id); 545 546 return !invalid_logical_cpuid(cpuid); 547} 548 549/* vendor specific UUID indicating an Intel platform */ 550static u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; 551 552static acpi_status __init acpi_processor_osc(acpi_handle handle, u32 lvl, 553 void *context, void **rv) 554{ 555 u32 capbuf[2] = {}; 556 struct acpi_osc_context osc_context = { 557 .uuid_str = sb_uuid_str, 558 .rev = 1, 559 .cap.length = 8, 560 .cap.pointer = capbuf, 561 }; 562 acpi_status status; 563 564 if (!processor_physically_present(handle)) 565 return AE_OK; 566 567 arch_acpi_set_proc_cap_bits(&capbuf[OSC_SUPPORT_DWORD]); 568 569 status = acpi_run_osc(handle, &osc_context); 570 if (ACPI_FAILURE(status)) 571 return status; 572 573 kfree(osc_context.ret.pointer); 574 575 return AE_OK; 576} 577 578static bool __init acpi_early_processor_osc(void) 579{ 580 acpi_status status; 581 582 acpi_proc_quirk_mwait_check(); 583 584 status = acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 585 ACPI_UINT32_MAX, acpi_processor_osc, NULL, 586 NULL, NULL); 587 if (ACPI_FAILURE(status)) 588 return false; 589 590 status = acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_osc, 591 NULL, NULL); 592 if (ACPI_FAILURE(status)) 593 return false; 594 595 return true; 596} 597 598void __init acpi_early_processor_control_setup(void) 599{ 600 if (acpi_early_processor_osc()) { 601 pr_info("_OSC evaluated successfully for all CPUs\n"); 602 } else { 603 pr_info("_OSC evaluation for CPUs failed, trying _PDC\n"); 604 acpi_early_processor_set_pdc(); 605 } 606} 607#endif 608 609/* 610 * The following ACPI IDs are known to be suitable for representing as 611 * processor devices. 612 */ 613static const struct acpi_device_id processor_device_ids[] = { 614 615 { ACPI_PROCESSOR_OBJECT_HID, }, 616 { ACPI_PROCESSOR_DEVICE_HID, }, 617 618 { } 619}; 620 621static struct acpi_scan_handler processor_handler = { 622 .ids = processor_device_ids, 623 .attach = acpi_processor_add, 624#ifdef CONFIG_ACPI_HOTPLUG_CPU 625 .detach = acpi_processor_remove, 626#endif 627 .hotplug = { 628 .enabled = true, 629 }, 630}; 631 632static int acpi_processor_container_attach(struct acpi_device *dev, 633 const struct acpi_device_id *id) 634{ 635 return 1; 636} 637 638static const struct acpi_device_id processor_container_ids[] = { 639 { ACPI_PROCESSOR_CONTAINER_HID, }, 640 { } 641}; 642 643static struct acpi_scan_handler processor_container_handler = { 644 .ids = processor_container_ids, 645 .attach = acpi_processor_container_attach, 646}; 647 648/* The number of the unique processor IDs */ 649static int nr_unique_ids __initdata; 650 651/* The number of the duplicate processor IDs */ 652static int nr_duplicate_ids; 653 654/* Used to store the unique processor IDs */ 655static int unique_processor_ids[] __initdata = { 656 [0 ... NR_CPUS - 1] = -1, 657}; 658 659/* Used to store the duplicate processor IDs */ 660static int duplicate_processor_ids[] = { 661 [0 ... NR_CPUS - 1] = -1, 662}; 663 664static void __init processor_validated_ids_update(int proc_id) 665{ 666 int i; 667 668 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS) 669 return; 670 671 /* 672 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is 673 * already in the IDs, do nothing. 674 */ 675 for (i = 0; i < nr_duplicate_ids; i++) { 676 if (duplicate_processor_ids[i] == proc_id) 677 return; 678 } 679 680 /* 681 * Secondly, compare the proc_id with unique IDs, if the proc_id is in 682 * the IDs, put it in the duplicate IDs. 683 */ 684 for (i = 0; i < nr_unique_ids; i++) { 685 if (unique_processor_ids[i] == proc_id) { 686 duplicate_processor_ids[nr_duplicate_ids] = proc_id; 687 nr_duplicate_ids++; 688 return; 689 } 690 } 691 692 /* 693 * Lastly, the proc_id is a unique ID, put it in the unique IDs. 694 */ 695 unique_processor_ids[nr_unique_ids] = proc_id; 696 nr_unique_ids++; 697} 698 699static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, 700 u32 lvl, 701 void *context, 702 void **rv) 703{ 704 acpi_status status; 705 acpi_object_type acpi_type; 706 unsigned long long uid; 707 union acpi_object object = { 0 }; 708 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 709 710 status = acpi_get_type(handle, &acpi_type); 711 if (ACPI_FAILURE(status)) 712 return status; 713 714 switch (acpi_type) { 715 case ACPI_TYPE_PROCESSOR: 716 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 717 if (ACPI_FAILURE(status)) 718 goto err; 719 uid = object.processor.proc_id; 720 break; 721 722 case ACPI_TYPE_DEVICE: 723 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); 724 if (ACPI_FAILURE(status)) 725 goto err; 726 break; 727 default: 728 goto err; 729 } 730 731 processor_validated_ids_update(uid); 732 return AE_OK; 733 734err: 735 /* Exit on error, but don't abort the namespace walk */ 736 acpi_handle_info(handle, "Invalid processor object\n"); 737 return AE_OK; 738 739} 740 741static void __init acpi_processor_check_duplicates(void) 742{ 743 /* check the correctness for all processors in ACPI namespace */ 744 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 745 ACPI_UINT32_MAX, 746 acpi_processor_ids_walk, 747 NULL, NULL, NULL); 748 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, 749 NULL, NULL); 750} 751 752bool acpi_duplicate_processor_id(int proc_id) 753{ 754 int i; 755 756 /* 757 * compare the proc_id with duplicate IDs, if the proc_id is already 758 * in the duplicate IDs, return true, otherwise, return false. 759 */ 760 for (i = 0; i < nr_duplicate_ids; i++) { 761 if (duplicate_processor_ids[i] == proc_id) 762 return true; 763 } 764 return false; 765} 766 767void __init acpi_processor_init(void) 768{ 769 acpi_processor_check_duplicates(); 770 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); 771 acpi_scan_add_handler(&processor_container_handler); 772 acpi_pcc_cpufreq_init(); 773} 774 775#ifdef CONFIG_ACPI_PROCESSOR_CSTATE 776/** 777 * acpi_processor_claim_cst_control - Request _CST control from the platform. 778 */ 779bool acpi_processor_claim_cst_control(void) 780{ 781 static bool cst_control_claimed; 782 acpi_status status; 783 784 if (!acpi_gbl_FADT.cst_control || cst_control_claimed) 785 return true; 786 787 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 788 acpi_gbl_FADT.cst_control, 8); 789 if (ACPI_FAILURE(status)) { 790 pr_warn("ACPI: Failed to claim processor _CST control\n"); 791 return false; 792 } 793 794 cst_control_claimed = true; 795 return true; 796} 797EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control); 798 799/** 800 * acpi_processor_evaluate_cst - Evaluate the processor _CST control method. 801 * @handle: ACPI handle of the processor object containing the _CST. 802 * @cpu: The numeric ID of the target CPU. 803 * @info: Object write the C-states information into. 804 * 805 * Extract the C-state information for the given CPU from the output of the _CST 806 * control method under the corresponding ACPI processor object (or processor 807 * device object) and populate @info with it. 808 * 809 * If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke 810 * acpi_processor_ffh_cstate_probe() to verify them and update the 811 * cpu_cstate_entry data for @cpu. 812 */ 813int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, 814 struct acpi_processor_power *info) 815{ 816 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 817 union acpi_object *cst; 818 acpi_status status; 819 u64 count; 820 int last_index = 0; 821 int i, ret = 0; 822 823 status = acpi_evaluate_object(handle, "_CST", NULL, &buffer); 824 if (ACPI_FAILURE(status)) { 825 acpi_handle_debug(handle, "No _CST\n"); 826 return -ENODEV; 827 } 828 829 cst = buffer.pointer; 830 831 /* There must be at least 2 elements. */ 832 if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) { 833 acpi_handle_warn(handle, "Invalid _CST output\n"); 834 ret = -EFAULT; 835 goto end; 836 } 837 838 count = cst->package.elements[0].integer.value; 839 840 /* Validate the number of C-states. */ 841 if (count < 1 || count != cst->package.count - 1) { 842 acpi_handle_warn(handle, "Inconsistent _CST data\n"); 843 ret = -EFAULT; 844 goto end; 845 } 846 847 for (i = 1; i <= count; i++) { 848 union acpi_object *element; 849 union acpi_object *obj; 850 struct acpi_power_register *reg; 851 struct acpi_processor_cx cx; 852 853 /* 854 * If there is not enough space for all C-states, skip the 855 * excess ones and log a warning. 856 */ 857 if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) { 858 acpi_handle_warn(handle, 859 "No room for more idle states (limit: %d)\n", 860 ACPI_PROCESSOR_MAX_POWER - 1); 861 break; 862 } 863 864 memset(&cx, 0, sizeof(cx)); 865 866 element = &cst->package.elements[i]; 867 if (element->type != ACPI_TYPE_PACKAGE) { 868 acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n", 869 i, element->type); 870 continue; 871 } 872 873 if (element->package.count != 4) { 874 acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n", 875 i, element->package.count); 876 continue; 877 } 878 879 obj = &element->package.elements[0]; 880 881 if (obj->type != ACPI_TYPE_BUFFER) { 882 acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n", 883 i, obj->type); 884 continue; 885 } 886 887 reg = (struct acpi_power_register *)obj->buffer.pointer; 888 889 obj = &element->package.elements[1]; 890 if (obj->type != ACPI_TYPE_INTEGER) { 891 acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n", 892 i, obj->type); 893 continue; 894 } 895 896 cx.type = obj->integer.value; 897 /* 898 * There are known cases in which the _CST output does not 899 * contain C1, so if the type of the first state found is not 900 * C1, leave an empty slot for C1 to be filled in later. 901 */ 902 if (i == 1 && cx.type != ACPI_STATE_C1) 903 last_index = 1; 904 905 cx.address = reg->address; 906 cx.index = last_index + 1; 907 908 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 909 if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) { 910 /* 911 * In the majority of cases _CST describes C1 as 912 * a FIXED_HARDWARE C-state, but if the command 913 * line forbids using MWAIT, use CSTATE_HALT for 914 * C1 regardless. 915 */ 916 if (cx.type == ACPI_STATE_C1 && 917 boot_option_idle_override == IDLE_NOMWAIT) { 918 cx.entry_method = ACPI_CSTATE_HALT; 919 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 920 } else { 921 cx.entry_method = ACPI_CSTATE_FFH; 922 } 923 } else if (cx.type == ACPI_STATE_C1) { 924 /* 925 * In the special case of C1, FIXED_HARDWARE can 926 * be handled by executing the HLT instruction. 927 */ 928 cx.entry_method = ACPI_CSTATE_HALT; 929 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 930 } else { 931 acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n", 932 i); 933 continue; 934 } 935 } else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 936 cx.entry_method = ACPI_CSTATE_SYSTEMIO; 937 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 938 cx.address); 939 } else { 940 acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n", 941 i, reg->space_id); 942 continue; 943 } 944 945 if (cx.type == ACPI_STATE_C1) 946 cx.valid = 1; 947 948 obj = &element->package.elements[2]; 949 if (obj->type != ACPI_TYPE_INTEGER) { 950 acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n", 951 i, obj->type); 952 continue; 953 } 954 955 cx.latency = obj->integer.value; 956 957 obj = &element->package.elements[3]; 958 if (obj->type != ACPI_TYPE_INTEGER) { 959 acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n", 960 i, obj->type); 961 continue; 962 } 963 964 memcpy(&info->states[++last_index], &cx, sizeof(cx)); 965 } 966 967 acpi_handle_info(handle, "Found %d idle states\n", last_index); 968 969 info->count = last_index; 970 971end: 972 kfree(buffer.pointer); 973 974 return ret; 975} 976EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst); 977#endif /* CONFIG_ACPI_PROCESSOR_CSTATE */ 978