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 31 DEFINE_PER_CPU(struct acpi_processor *, processors); 32 EXPORT_PER_CPU_SYMBOL(processors); 33 34 /* Errata Handling */ 35 struct acpi_processor_errata errata __read_mostly; 36 EXPORT_SYMBOL_GPL(errata); 37 38 static 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 } 137 138 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 /* Create a platform device to represent a CPU frequency control mechanism. */ 158 static 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. */ 169 static 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 182 static void __init acpi_pcc_cpufreq_init(void) {} 183 #endif /* CONFIG_X86 */ 184 185 /* Initialization */ 186 #ifdef CONFIG_ACPI_HOTPLUG_CPU 187 int __weak acpi_map_cpu(acpi_handle handle, 188 phys_cpuid_t physid, u32 acpi_id, int *pcpu) 189 { 190 return -ENODEV; 191 } 192 193 int __weak acpi_unmap_cpu(int cpu) 194 { 195 return -ENODEV; 196 } 197 198 int __weak arch_register_cpu(int cpu) 199 { 200 return -ENODEV; 201 } 202 203 void __weak arch_unregister_cpu(int cpu) {} 204 205 static 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; 238 239 out: 240 cpus_write_unlock(); 241 cpu_maps_update_done(); 242 return ret; 243 } 244 #else 245 static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) 246 { 247 return -ENODEV; 248 } 249 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 250 251 static 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 */ 393 static DEFINE_PER_CPU(void *, processor_device_array); 394 395 static 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 goto err_clear_driver_data; 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_clear_driver_data; 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_clear_per_cpu; 446 } 447 448 result = acpi_bind_one(dev, device); 449 if (result) 450 goto err_clear_per_cpu; 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_clear_per_cpu: 462 per_cpu(processors, pr->id) = NULL; 463 err_clear_driver_data: 464 device->driver_data = NULL; 465 free_cpumask_var(pr->throttling.shared_cpu_map); 466 err_free_pr: 467 kfree(pr); 468 return result; 469 } 470 471 #ifdef CONFIG_ACPI_HOTPLUG_CPU 472 /* Removal */ 473 static void acpi_processor_remove(struct acpi_device *device) 474 { 475 struct acpi_processor *pr; 476 477 if (!device || !acpi_driver_data(device)) 478 return; 479 480 pr = acpi_driver_data(device); 481 if (pr->id >= nr_cpu_ids) 482 goto out; 483 484 /* 485 * The only reason why we ever get here is CPU hot-removal. The CPU is 486 * already offline and the ACPI device removal locking prevents it from 487 * being put back online at this point. 488 * 489 * Unbind the driver from the processor device and detach it from the 490 * ACPI companion object. 491 */ 492 device_release_driver(pr->dev); 493 acpi_unbind_one(pr->dev); 494 495 /* Clean up. */ 496 per_cpu(processor_device_array, pr->id) = NULL; 497 per_cpu(processors, pr->id) = NULL; 498 499 cpu_maps_update_begin(); 500 cpus_write_lock(); 501 502 /* Remove the CPU. */ 503 arch_unregister_cpu(pr->id); 504 acpi_unmap_cpu(pr->id); 505 506 cpus_write_unlock(); 507 cpu_maps_update_done(); 508 509 try_offline_node(cpu_to_node(pr->id)); 510 511 out: 512 free_cpumask_var(pr->throttling.shared_cpu_map); 513 kfree(pr); 514 } 515 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 516 517 #ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC 518 bool __init processor_physically_present(acpi_handle handle) 519 { 520 int cpuid, type; 521 u32 acpi_id; 522 acpi_status status; 523 acpi_object_type acpi_type; 524 unsigned long long tmp; 525 union acpi_object object = {}; 526 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 527 528 status = acpi_get_type(handle, &acpi_type); 529 if (ACPI_FAILURE(status)) 530 return false; 531 532 switch (acpi_type) { 533 case ACPI_TYPE_PROCESSOR: 534 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 535 if (ACPI_FAILURE(status)) 536 return false; 537 acpi_id = object.processor.proc_id; 538 break; 539 case ACPI_TYPE_DEVICE: 540 status = acpi_evaluate_integer(handle, METHOD_NAME__UID, 541 NULL, &tmp); 542 if (ACPI_FAILURE(status)) 543 return false; 544 acpi_id = tmp; 545 break; 546 default: 547 return false; 548 } 549 550 if (xen_initial_domain()) 551 /* 552 * When running as a Xen dom0 the number of processors Linux 553 * sees can be different from the real number of processors on 554 * the system, and we still need to execute _PDC or _OSC for 555 * all of them. 556 */ 557 return xen_processor_present(acpi_id); 558 559 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 560 cpuid = acpi_get_cpuid(handle, type, acpi_id); 561 562 return !invalid_logical_cpuid(cpuid); 563 } 564 565 /* vendor specific UUID indicating an Intel platform */ 566 static u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; 567 568 static acpi_status __init acpi_processor_osc(acpi_handle handle, u32 lvl, 569 void *context, void **rv) 570 { 571 u32 capbuf[2] = {}; 572 struct acpi_osc_context osc_context = { 573 .uuid_str = sb_uuid_str, 574 .rev = 1, 575 .cap.length = 8, 576 .cap.pointer = capbuf, 577 }; 578 acpi_status status; 579 580 if (!processor_physically_present(handle)) 581 return AE_OK; 582 583 arch_acpi_set_proc_cap_bits(&capbuf[OSC_SUPPORT_DWORD]); 584 585 status = acpi_run_osc(handle, &osc_context); 586 if (ACPI_FAILURE(status)) 587 return status; 588 589 kfree(osc_context.ret.pointer); 590 591 return AE_OK; 592 } 593 594 static bool __init acpi_early_processor_osc(void) 595 { 596 acpi_status status; 597 598 acpi_proc_quirk_mwait_check(); 599 600 status = acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 601 ACPI_UINT32_MAX, acpi_processor_osc, NULL, 602 NULL, NULL); 603 if (ACPI_FAILURE(status)) 604 return false; 605 606 status = acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_osc, 607 NULL, NULL); 608 if (ACPI_FAILURE(status)) 609 return false; 610 611 return true; 612 } 613 614 void __init acpi_early_processor_control_setup(void) 615 { 616 if (acpi_early_processor_osc()) { 617 pr_info("_OSC evaluated successfully for all CPUs\n"); 618 } else { 619 pr_info("_OSC evaluation for CPUs failed, trying _PDC\n"); 620 acpi_early_processor_set_pdc(); 621 } 622 } 623 #endif 624 625 /* 626 * The following ACPI IDs are known to be suitable for representing as 627 * processor devices. 628 */ 629 static const struct acpi_device_id processor_device_ids[] = { 630 631 { ACPI_PROCESSOR_OBJECT_HID, }, 632 { ACPI_PROCESSOR_DEVICE_HID, }, 633 634 { } 635 }; 636 637 static struct acpi_scan_handler processor_handler = { 638 .ids = processor_device_ids, 639 .attach = acpi_processor_add, 640 #ifdef CONFIG_ACPI_HOTPLUG_CPU 641 .detach = acpi_processor_remove, 642 #endif 643 .hotplug = { 644 .enabled = true, 645 }, 646 }; 647 648 static int acpi_processor_container_attach(struct acpi_device *dev, 649 const struct acpi_device_id *id) 650 { 651 return 1; 652 } 653 654 static const struct acpi_device_id processor_container_ids[] = { 655 { ACPI_PROCESSOR_CONTAINER_HID, }, 656 { } 657 }; 658 659 static struct acpi_scan_handler processor_container_handler = { 660 .ids = processor_container_ids, 661 .attach = acpi_processor_container_attach, 662 }; 663 664 /* The number of the unique processor IDs */ 665 static int nr_unique_ids __initdata; 666 667 /* The number of the duplicate processor IDs */ 668 static int nr_duplicate_ids; 669 670 /* Used to store the unique processor IDs */ 671 static int unique_processor_ids[] __initdata = { 672 [0 ... NR_CPUS - 1] = -1, 673 }; 674 675 /* Used to store the duplicate processor IDs */ 676 static int duplicate_processor_ids[] = { 677 [0 ... NR_CPUS - 1] = -1, 678 }; 679 680 static void __init processor_validated_ids_update(int proc_id) 681 { 682 int i; 683 684 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS) 685 return; 686 687 /* 688 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is 689 * already in the IDs, do nothing. 690 */ 691 for (i = 0; i < nr_duplicate_ids; i++) { 692 if (duplicate_processor_ids[i] == proc_id) 693 return; 694 } 695 696 /* 697 * Secondly, compare the proc_id with unique IDs, if the proc_id is in 698 * the IDs, put it in the duplicate IDs. 699 */ 700 for (i = 0; i < nr_unique_ids; i++) { 701 if (unique_processor_ids[i] == proc_id) { 702 duplicate_processor_ids[nr_duplicate_ids] = proc_id; 703 nr_duplicate_ids++; 704 return; 705 } 706 } 707 708 /* 709 * Lastly, the proc_id is a unique ID, put it in the unique IDs. 710 */ 711 unique_processor_ids[nr_unique_ids] = proc_id; 712 nr_unique_ids++; 713 } 714 715 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, 716 u32 lvl, 717 void *context, 718 void **rv) 719 { 720 acpi_status status; 721 acpi_object_type acpi_type; 722 unsigned long long uid; 723 union acpi_object object = { 0 }; 724 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 725 726 status = acpi_get_type(handle, &acpi_type); 727 if (ACPI_FAILURE(status)) 728 return status; 729 730 switch (acpi_type) { 731 case ACPI_TYPE_PROCESSOR: 732 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 733 if (ACPI_FAILURE(status)) 734 goto err; 735 uid = object.processor.proc_id; 736 break; 737 738 case ACPI_TYPE_DEVICE: 739 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); 740 if (ACPI_FAILURE(status)) 741 goto err; 742 break; 743 default: 744 goto err; 745 } 746 747 processor_validated_ids_update(uid); 748 return AE_OK; 749 750 err: 751 /* Exit on error, but don't abort the namespace walk */ 752 acpi_handle_info(handle, "Invalid processor object\n"); 753 return AE_OK; 754 755 } 756 757 static void __init acpi_processor_check_duplicates(void) 758 { 759 /* check the correctness for all processors in ACPI namespace */ 760 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 761 ACPI_UINT32_MAX, 762 acpi_processor_ids_walk, 763 NULL, NULL, NULL); 764 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, 765 NULL, NULL); 766 } 767 768 bool acpi_duplicate_processor_id(int proc_id) 769 { 770 int i; 771 772 /* 773 * compare the proc_id with duplicate IDs, if the proc_id is already 774 * in the duplicate IDs, return true, otherwise, return false. 775 */ 776 for (i = 0; i < nr_duplicate_ids; i++) { 777 if (duplicate_processor_ids[i] == proc_id) 778 return true; 779 } 780 return false; 781 } 782 783 void __init acpi_processor_init(void) 784 { 785 acpi_processor_check_duplicates(); 786 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); 787 acpi_scan_add_handler(&processor_container_handler); 788 acpi_pcc_cpufreq_init(); 789 } 790 791 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE 792 /** 793 * acpi_processor_claim_cst_control - Request _CST control from the platform. 794 */ 795 bool acpi_processor_claim_cst_control(void) 796 { 797 static bool cst_control_claimed; 798 acpi_status status; 799 800 if (!acpi_gbl_FADT.cst_control || cst_control_claimed) 801 return true; 802 803 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 804 acpi_gbl_FADT.cst_control, 8); 805 if (ACPI_FAILURE(status)) { 806 pr_warn("ACPI: Failed to claim processor _CST control\n"); 807 return false; 808 } 809 810 cst_control_claimed = true; 811 return true; 812 } 813 EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control); 814 815 /** 816 * acpi_processor_evaluate_cst - Evaluate the processor _CST control method. 817 * @handle: ACPI handle of the processor object containing the _CST. 818 * @cpu: The numeric ID of the target CPU. 819 * @info: Object write the C-states information into. 820 * 821 * Extract the C-state information for the given CPU from the output of the _CST 822 * control method under the corresponding ACPI processor object (or processor 823 * device object) and populate @info with it. 824 * 825 * If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke 826 * acpi_processor_ffh_cstate_probe() to verify them and update the 827 * cpu_cstate_entry data for @cpu. 828 */ 829 int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, 830 struct acpi_processor_power *info) 831 { 832 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 833 union acpi_object *cst; 834 acpi_status status; 835 u64 count; 836 int last_index = 0; 837 int i, ret = 0; 838 839 status = acpi_evaluate_object(handle, "_CST", NULL, &buffer); 840 if (ACPI_FAILURE(status)) { 841 acpi_handle_debug(handle, "No _CST\n"); 842 return -ENODEV; 843 } 844 845 cst = buffer.pointer; 846 847 /* There must be at least 2 elements. */ 848 if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) { 849 acpi_handle_warn(handle, "Invalid _CST output\n"); 850 ret = -EFAULT; 851 goto end; 852 } 853 854 count = cst->package.elements[0].integer.value; 855 856 /* Validate the number of C-states. */ 857 if (count < 1 || count != cst->package.count - 1) { 858 acpi_handle_warn(handle, "Inconsistent _CST data\n"); 859 ret = -EFAULT; 860 goto end; 861 } 862 863 for (i = 1; i <= count; i++) { 864 union acpi_object *element; 865 union acpi_object *obj; 866 struct acpi_power_register *reg; 867 struct acpi_processor_cx cx; 868 869 /* 870 * If there is not enough space for all C-states, skip the 871 * excess ones and log a warning. 872 */ 873 if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) { 874 acpi_handle_warn(handle, 875 "No room for more idle states (limit: %d)\n", 876 ACPI_PROCESSOR_MAX_POWER - 1); 877 break; 878 } 879 880 memset(&cx, 0, sizeof(cx)); 881 882 element = &cst->package.elements[i]; 883 if (element->type != ACPI_TYPE_PACKAGE) { 884 acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n", 885 i, element->type); 886 continue; 887 } 888 889 if (element->package.count != 4) { 890 acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n", 891 i, element->package.count); 892 continue; 893 } 894 895 obj = &element->package.elements[0]; 896 897 if (obj->type != ACPI_TYPE_BUFFER) { 898 acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n", 899 i, obj->type); 900 continue; 901 } 902 903 reg = (struct acpi_power_register *)obj->buffer.pointer; 904 905 obj = &element->package.elements[1]; 906 if (obj->type != ACPI_TYPE_INTEGER) { 907 acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n", 908 i, obj->type); 909 continue; 910 } 911 912 cx.type = obj->integer.value; 913 /* 914 * There are known cases in which the _CST output does not 915 * contain C1, so if the type of the first state found is not 916 * C1, leave an empty slot for C1 to be filled in later. 917 */ 918 if (i == 1 && cx.type != ACPI_STATE_C1) 919 last_index = 1; 920 921 cx.address = reg->address; 922 cx.index = last_index + 1; 923 924 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 925 if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) { 926 /* 927 * In the majority of cases _CST describes C1 as 928 * a FIXED_HARDWARE C-state, but if the command 929 * line forbids using MWAIT, use CSTATE_HALT for 930 * C1 regardless. 931 */ 932 if (cx.type == ACPI_STATE_C1 && 933 boot_option_idle_override == IDLE_NOMWAIT) { 934 cx.entry_method = ACPI_CSTATE_HALT; 935 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 936 } else { 937 cx.entry_method = ACPI_CSTATE_FFH; 938 } 939 } else if (cx.type == ACPI_STATE_C1) { 940 /* 941 * In the special case of C1, FIXED_HARDWARE can 942 * be handled by executing the HLT instruction. 943 */ 944 cx.entry_method = ACPI_CSTATE_HALT; 945 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 946 } else { 947 acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n", 948 i); 949 continue; 950 } 951 } else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 952 cx.entry_method = ACPI_CSTATE_SYSTEMIO; 953 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 954 cx.address); 955 } else { 956 acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n", 957 i, reg->space_id); 958 continue; 959 } 960 961 if (cx.type == ACPI_STATE_C1) 962 cx.valid = 1; 963 964 obj = &element->package.elements[2]; 965 if (obj->type != ACPI_TYPE_INTEGER) { 966 acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n", 967 i, obj->type); 968 continue; 969 } 970 971 cx.latency = obj->integer.value; 972 973 obj = &element->package.elements[3]; 974 if (obj->type != ACPI_TYPE_INTEGER) { 975 acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n", 976 i, obj->type); 977 continue; 978 } 979 980 memcpy(&info->states[++last_index], &cx, sizeof(cx)); 981 } 982 983 acpi_handle_info(handle, "Found %d idle states\n", last_index); 984 985 info->count = last_index; 986 987 end: 988 kfree(buffer.pointer); 989 990 return ret; 991 } 992 EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst); 993 #endif /* CONFIG_ACPI_PROCESSOR_CSTATE */ 994