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