1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) 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 * - Added processor hotplug support 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/cpufreq.h> 16 #include <linux/slab.h> 17 #include <linux/acpi.h> 18 #include <acpi/processor.h> 19 #ifdef CONFIG_X86 20 #include <asm/cpufeature.h> 21 #endif 22 23 #define PREFIX "ACPI: " 24 25 #define ACPI_PROCESSOR_CLASS "processor" 26 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" 27 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 28 ACPI_MODULE_NAME("processor_perflib"); 29 30 static DEFINE_MUTEX(performance_mutex); 31 32 /* 33 * _PPC support is implemented as a CPUfreq policy notifier: 34 * This means each time a CPUfreq driver registered also with 35 * the ACPI core is asked to change the speed policy, the maximum 36 * value is adjusted so that it is within the platform limit. 37 * 38 * Also, when a new platform limit value is detected, the CPUfreq 39 * policy is adjusted accordingly. 40 */ 41 42 /* ignore_ppc: 43 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet 44 * ignore _PPC 45 * 0 -> cpufreq low level drivers initialized -> consider _PPC values 46 * 1 -> ignore _PPC totally -> forced by user through boot param 47 */ 48 static int ignore_ppc = -1; 49 module_param(ignore_ppc, int, 0644); 50 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ 51 "limited by BIOS, this should help"); 52 53 #define PPC_REGISTERED 1 54 #define PPC_IN_USE 2 55 56 static int acpi_processor_ppc_status; 57 58 static int acpi_processor_ppc_notifier(struct notifier_block *nb, 59 unsigned long event, void *data) 60 { 61 struct cpufreq_policy *policy = data; 62 struct acpi_processor *pr; 63 unsigned int ppc = 0; 64 65 if (ignore_ppc < 0) 66 ignore_ppc = 0; 67 68 if (ignore_ppc) 69 return 0; 70 71 if (event != CPUFREQ_ADJUST) 72 return 0; 73 74 mutex_lock(&performance_mutex); 75 76 pr = per_cpu(processors, policy->cpu); 77 if (!pr || !pr->performance) 78 goto out; 79 80 ppc = (unsigned int)pr->performance_platform_limit; 81 82 if (ppc >= pr->performance->state_count) 83 goto out; 84 85 cpufreq_verify_within_limits(policy, 0, 86 pr->performance->states[ppc]. 87 core_frequency * 1000); 88 89 out: 90 mutex_unlock(&performance_mutex); 91 92 return 0; 93 } 94 95 static struct notifier_block acpi_ppc_notifier_block = { 96 .notifier_call = acpi_processor_ppc_notifier, 97 }; 98 99 static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 100 { 101 acpi_status status = 0; 102 unsigned long long ppc = 0; 103 104 105 if (!pr) 106 return -EINVAL; 107 108 /* 109 * _PPC indicates the maximum state currently supported by the platform 110 * (e.g. 0 = states 0..n; 1 = states 1..n; etc. 111 */ 112 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); 113 114 if (status != AE_NOT_FOUND) 115 acpi_processor_ppc_status |= PPC_IN_USE; 116 117 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 118 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); 119 return -ENODEV; 120 } 121 122 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, 123 (int)ppc, ppc ? "" : "not"); 124 125 pr->performance_platform_limit = (int)ppc; 126 127 return 0; 128 } 129 130 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 131 /* 132 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status 133 * @handle: ACPI processor handle 134 * @status: the status code of _PPC evaluation 135 * 0: success. OSPM is now using the performance state specificed. 136 * 1: failure. OSPM has not changed the number of P-states in use 137 */ 138 static void acpi_processor_ppc_ost(acpi_handle handle, int status) 139 { 140 if (acpi_has_method(handle, "_OST")) 141 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, 142 status, NULL); 143 } 144 145 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) 146 { 147 int ret; 148 149 if (ignore_ppc || !pr->performance) { 150 /* 151 * Only when it is notification event, the _OST object 152 * will be evaluated. Otherwise it is skipped. 153 */ 154 if (event_flag) 155 acpi_processor_ppc_ost(pr->handle, 1); 156 return; 157 } 158 159 ret = acpi_processor_get_platform_limit(pr); 160 /* 161 * Only when it is notification event, the _OST object 162 * will be evaluated. Otherwise it is skipped. 163 */ 164 if (event_flag) { 165 if (ret < 0) 166 acpi_processor_ppc_ost(pr->handle, 1); 167 else 168 acpi_processor_ppc_ost(pr->handle, 0); 169 } 170 if (ret >= 0) 171 cpufreq_update_limits(pr->id); 172 } 173 174 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 175 { 176 struct acpi_processor *pr; 177 178 pr = per_cpu(processors, cpu); 179 if (!pr || !pr->performance || !pr->performance->state_count) 180 return -ENODEV; 181 *limit = pr->performance->states[pr->performance_platform_limit]. 182 core_frequency * 1000; 183 return 0; 184 } 185 EXPORT_SYMBOL(acpi_processor_get_bios_limit); 186 187 void acpi_processor_ppc_init(void) 188 { 189 if (!cpufreq_register_notifier 190 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 191 acpi_processor_ppc_status |= PPC_REGISTERED; 192 else 193 printk(KERN_DEBUG 194 "Warning: Processor Platform Limit not supported.\n"); 195 } 196 197 void acpi_processor_ppc_exit(void) 198 { 199 if (acpi_processor_ppc_status & PPC_REGISTERED) 200 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 201 CPUFREQ_POLICY_NOTIFIER); 202 203 acpi_processor_ppc_status &= ~PPC_REGISTERED; 204 } 205 206 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 207 { 208 int result = 0; 209 acpi_status status = 0; 210 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 211 union acpi_object *pct = NULL; 212 union acpi_object obj = { 0 }; 213 214 215 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 216 if (ACPI_FAILURE(status)) { 217 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 218 return -ENODEV; 219 } 220 221 pct = (union acpi_object *)buffer.pointer; 222 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 223 || (pct->package.count != 2)) { 224 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 225 result = -EFAULT; 226 goto end; 227 } 228 229 /* 230 * control_register 231 */ 232 233 obj = pct->package.elements[0]; 234 235 if ((obj.type != ACPI_TYPE_BUFFER) 236 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 237 || (obj.buffer.pointer == NULL)) { 238 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 239 result = -EFAULT; 240 goto end; 241 } 242 memcpy(&pr->performance->control_register, obj.buffer.pointer, 243 sizeof(struct acpi_pct_register)); 244 245 /* 246 * status_register 247 */ 248 249 obj = pct->package.elements[1]; 250 251 if ((obj.type != ACPI_TYPE_BUFFER) 252 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 253 || (obj.buffer.pointer == NULL)) { 254 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 255 result = -EFAULT; 256 goto end; 257 } 258 259 memcpy(&pr->performance->status_register, obj.buffer.pointer, 260 sizeof(struct acpi_pct_register)); 261 262 end: 263 kfree(buffer.pointer); 264 265 return result; 266 } 267 268 #ifdef CONFIG_X86 269 /* 270 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 271 * in their ACPI data. Calculate the real values and fix up the _PSS data. 272 */ 273 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 274 { 275 u32 hi, lo, fid, did; 276 int index = px->control & 0x00000007; 277 278 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 279 return; 280 281 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 282 || boot_cpu_data.x86 == 0x11) { 283 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 284 /* 285 * MSR C001_0064+: 286 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 287 */ 288 if (!(hi & BIT(31))) 289 return; 290 291 fid = lo & 0x3f; 292 did = (lo >> 6) & 7; 293 if (boot_cpu_data.x86 == 0x10) 294 px->core_frequency = (100 * (fid + 0x10)) >> did; 295 else 296 px->core_frequency = (100 * (fid + 8)) >> did; 297 } 298 } 299 #else 300 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 301 #endif 302 303 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 304 { 305 int result = 0; 306 acpi_status status = AE_OK; 307 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 308 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 309 struct acpi_buffer state = { 0, NULL }; 310 union acpi_object *pss = NULL; 311 int i; 312 int last_invalid = -1; 313 314 315 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 316 if (ACPI_FAILURE(status)) { 317 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 318 return -ENODEV; 319 } 320 321 pss = buffer.pointer; 322 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 323 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 324 result = -EFAULT; 325 goto end; 326 } 327 328 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 329 pss->package.count)); 330 331 pr->performance->state_count = pss->package.count; 332 pr->performance->states = 333 kmalloc_array(pss->package.count, 334 sizeof(struct acpi_processor_px), 335 GFP_KERNEL); 336 if (!pr->performance->states) { 337 result = -ENOMEM; 338 goto end; 339 } 340 341 for (i = 0; i < pr->performance->state_count; i++) { 342 343 struct acpi_processor_px *px = &(pr->performance->states[i]); 344 345 state.length = sizeof(struct acpi_processor_px); 346 state.pointer = px; 347 348 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 349 350 status = acpi_extract_package(&(pss->package.elements[i]), 351 &format, &state); 352 if (ACPI_FAILURE(status)) { 353 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 354 result = -EFAULT; 355 kfree(pr->performance->states); 356 goto end; 357 } 358 359 amd_fixup_frequency(px, i); 360 361 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 362 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 363 i, 364 (u32) px->core_frequency, 365 (u32) px->power, 366 (u32) px->transition_latency, 367 (u32) px->bus_master_latency, 368 (u32) px->control, (u32) px->status)); 369 370 /* 371 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 372 */ 373 if (!px->core_frequency || 374 ((u32)(px->core_frequency * 1000) != 375 (px->core_frequency * 1000))) { 376 printk(KERN_ERR FW_BUG PREFIX 377 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 378 pr->id, px->core_frequency); 379 if (last_invalid == -1) 380 last_invalid = i; 381 } else { 382 if (last_invalid != -1) { 383 /* 384 * Copy this valid entry over last_invalid entry 385 */ 386 memcpy(&(pr->performance->states[last_invalid]), 387 px, sizeof(struct acpi_processor_px)); 388 ++last_invalid; 389 } 390 } 391 } 392 393 if (last_invalid == 0) { 394 printk(KERN_ERR FW_BUG PREFIX 395 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 396 result = -EFAULT; 397 kfree(pr->performance->states); 398 pr->performance->states = NULL; 399 } 400 401 if (last_invalid > 0) 402 pr->performance->state_count = last_invalid; 403 404 end: 405 kfree(buffer.pointer); 406 407 return result; 408 } 409 410 int acpi_processor_get_performance_info(struct acpi_processor *pr) 411 { 412 int result = 0; 413 414 if (!pr || !pr->performance || !pr->handle) 415 return -EINVAL; 416 417 if (!acpi_has_method(pr->handle, "_PCT")) { 418 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 419 "ACPI-based processor performance control unavailable\n")); 420 return -ENODEV; 421 } 422 423 result = acpi_processor_get_performance_control(pr); 424 if (result) 425 goto update_bios; 426 427 result = acpi_processor_get_performance_states(pr); 428 if (result) 429 goto update_bios; 430 431 /* We need to call _PPC once when cpufreq starts */ 432 if (ignore_ppc != 1) 433 result = acpi_processor_get_platform_limit(pr); 434 435 return result; 436 437 /* 438 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 439 * the BIOS is older than the CPU and does not know its frequencies 440 */ 441 update_bios: 442 #ifdef CONFIG_X86 443 if (acpi_has_method(pr->handle, "_PPC")) { 444 if(boot_cpu_has(X86_FEATURE_EST)) 445 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 446 "frequency support\n"); 447 } 448 #endif 449 return result; 450 } 451 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 452 453 int acpi_processor_pstate_control(void) 454 { 455 acpi_status status; 456 457 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) 458 return 0; 459 460 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 461 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 462 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 463 464 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 465 (u32)acpi_gbl_FADT.pstate_control, 8); 466 if (ACPI_SUCCESS(status)) 467 return 1; 468 469 ACPI_EXCEPTION((AE_INFO, status, 470 "Failed to write pstate_control [0x%x] to smi_command [0x%x]", 471 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 472 return -EIO; 473 } 474 475 int acpi_processor_notify_smm(struct module *calling_module) 476 { 477 static int is_done = 0; 478 int result; 479 480 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 481 return -EBUSY; 482 483 if (!try_module_get(calling_module)) 484 return -EINVAL; 485 486 /* is_done is set to negative if an error occurred, 487 * and to postitive if _no_ error occurred, but SMM 488 * was already notified. This avoids double notification 489 * which might lead to unexpected results... 490 */ 491 if (is_done > 0) { 492 module_put(calling_module); 493 return 0; 494 } else if (is_done < 0) { 495 module_put(calling_module); 496 return is_done; 497 } 498 499 is_done = -EIO; 500 501 result = acpi_processor_pstate_control(); 502 if (!result) { 503 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 504 module_put(calling_module); 505 return 0; 506 } 507 if (result < 0) { 508 module_put(calling_module); 509 return result; 510 } 511 512 /* Success. If there's no _PPC, we need to fear nothing, so 513 * we can allow the cpufreq driver to be rmmod'ed. */ 514 is_done = 1; 515 516 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 517 module_put(calling_module); 518 519 return 0; 520 } 521 522 EXPORT_SYMBOL(acpi_processor_notify_smm); 523 524 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain) 525 { 526 int result = 0; 527 acpi_status status = AE_OK; 528 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 529 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 530 struct acpi_buffer state = {0, NULL}; 531 union acpi_object *psd = NULL; 532 533 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer); 534 if (ACPI_FAILURE(status)) { 535 return -ENODEV; 536 } 537 538 psd = buffer.pointer; 539 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 540 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 541 result = -EFAULT; 542 goto end; 543 } 544 545 if (psd->package.count != 1) { 546 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 547 result = -EFAULT; 548 goto end; 549 } 550 551 state.length = sizeof(struct acpi_psd_package); 552 state.pointer = pdomain; 553 554 status = acpi_extract_package(&(psd->package.elements[0]), 555 &format, &state); 556 if (ACPI_FAILURE(status)) { 557 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 558 result = -EFAULT; 559 goto end; 560 } 561 562 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 563 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 564 result = -EFAULT; 565 goto end; 566 } 567 568 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 569 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 570 result = -EFAULT; 571 goto end; 572 } 573 574 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 575 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 576 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 577 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 578 result = -EFAULT; 579 goto end; 580 } 581 end: 582 kfree(buffer.pointer); 583 return result; 584 } 585 EXPORT_SYMBOL(acpi_processor_get_psd); 586 587 int acpi_processor_preregister_performance( 588 struct acpi_processor_performance __percpu *performance) 589 { 590 int count_target; 591 int retval = 0; 592 unsigned int i, j; 593 cpumask_var_t covered_cpus; 594 struct acpi_processor *pr; 595 struct acpi_psd_package *pdomain; 596 struct acpi_processor *match_pr; 597 struct acpi_psd_package *match_pdomain; 598 599 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 600 return -ENOMEM; 601 602 mutex_lock(&performance_mutex); 603 604 /* 605 * Check if another driver has already registered, and abort before 606 * changing pr->performance if it has. Check input data as well. 607 */ 608 for_each_possible_cpu(i) { 609 pr = per_cpu(processors, i); 610 if (!pr) { 611 /* Look only at processors in ACPI namespace */ 612 continue; 613 } 614 615 if (pr->performance) { 616 retval = -EBUSY; 617 goto err_out; 618 } 619 620 if (!performance || !per_cpu_ptr(performance, i)) { 621 retval = -EINVAL; 622 goto err_out; 623 } 624 } 625 626 /* Call _PSD for all CPUs */ 627 for_each_possible_cpu(i) { 628 pr = per_cpu(processors, i); 629 if (!pr) 630 continue; 631 632 pr->performance = per_cpu_ptr(performance, i); 633 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 634 pdomain = &(pr->performance->domain_info); 635 if (acpi_processor_get_psd(pr->handle, pdomain)) { 636 retval = -EINVAL; 637 continue; 638 } 639 } 640 if (retval) 641 goto err_ret; 642 643 /* 644 * Now that we have _PSD data from all CPUs, lets setup P-state 645 * domain info. 646 */ 647 for_each_possible_cpu(i) { 648 pr = per_cpu(processors, i); 649 if (!pr) 650 continue; 651 652 if (cpumask_test_cpu(i, covered_cpus)) 653 continue; 654 655 pdomain = &(pr->performance->domain_info); 656 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 657 cpumask_set_cpu(i, covered_cpus); 658 if (pdomain->num_processors <= 1) 659 continue; 660 661 /* Validate the Domain info */ 662 count_target = pdomain->num_processors; 663 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 664 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 665 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 666 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 667 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 668 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 669 670 for_each_possible_cpu(j) { 671 if (i == j) 672 continue; 673 674 match_pr = per_cpu(processors, j); 675 if (!match_pr) 676 continue; 677 678 match_pdomain = &(match_pr->performance->domain_info); 679 if (match_pdomain->domain != pdomain->domain) 680 continue; 681 682 /* Here i and j are in the same domain */ 683 684 if (match_pdomain->num_processors != count_target) { 685 retval = -EINVAL; 686 goto err_ret; 687 } 688 689 if (pdomain->coord_type != match_pdomain->coord_type) { 690 retval = -EINVAL; 691 goto err_ret; 692 } 693 694 cpumask_set_cpu(j, covered_cpus); 695 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 696 } 697 698 for_each_possible_cpu(j) { 699 if (i == j) 700 continue; 701 702 match_pr = per_cpu(processors, j); 703 if (!match_pr) 704 continue; 705 706 match_pdomain = &(match_pr->performance->domain_info); 707 if (match_pdomain->domain != pdomain->domain) 708 continue; 709 710 match_pr->performance->shared_type = 711 pr->performance->shared_type; 712 cpumask_copy(match_pr->performance->shared_cpu_map, 713 pr->performance->shared_cpu_map); 714 } 715 } 716 717 err_ret: 718 for_each_possible_cpu(i) { 719 pr = per_cpu(processors, i); 720 if (!pr || !pr->performance) 721 continue; 722 723 /* Assume no coordination on any error parsing domain info */ 724 if (retval) { 725 cpumask_clear(pr->performance->shared_cpu_map); 726 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 727 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 728 } 729 pr->performance = NULL; /* Will be set for real in register */ 730 } 731 732 err_out: 733 mutex_unlock(&performance_mutex); 734 free_cpumask_var(covered_cpus); 735 return retval; 736 } 737 EXPORT_SYMBOL(acpi_processor_preregister_performance); 738 739 int 740 acpi_processor_register_performance(struct acpi_processor_performance 741 *performance, unsigned int cpu) 742 { 743 struct acpi_processor *pr; 744 745 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 746 return -EINVAL; 747 748 mutex_lock(&performance_mutex); 749 750 pr = per_cpu(processors, cpu); 751 if (!pr) { 752 mutex_unlock(&performance_mutex); 753 return -ENODEV; 754 } 755 756 if (pr->performance) { 757 mutex_unlock(&performance_mutex); 758 return -EBUSY; 759 } 760 761 WARN_ON(!performance); 762 763 pr->performance = performance; 764 765 if (acpi_processor_get_performance_info(pr)) { 766 pr->performance = NULL; 767 mutex_unlock(&performance_mutex); 768 return -EIO; 769 } 770 771 mutex_unlock(&performance_mutex); 772 return 0; 773 } 774 775 EXPORT_SYMBOL(acpi_processor_register_performance); 776 777 void acpi_processor_unregister_performance(unsigned int cpu) 778 { 779 struct acpi_processor *pr; 780 781 mutex_lock(&performance_mutex); 782 783 pr = per_cpu(processors, cpu); 784 if (!pr) { 785 mutex_unlock(&performance_mutex); 786 return; 787 } 788 789 if (pr->performance) 790 kfree(pr->performance->states); 791 pr->performance = NULL; 792 793 mutex_unlock(&performance_mutex); 794 795 return; 796 } 797 798 EXPORT_SYMBOL(acpi_processor_unregister_performance); 799