1 /* 2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> 7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 8 * - Added processor hotplug support 9 * 10 * 11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or (at 16 * your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, but 19 * WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 * General Public License for more details. 22 * 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/init.h> 28 #include <linux/cpufreq.h> 29 #include <linux/slab.h> 30 #include <linux/acpi.h> 31 #include <acpi/processor.h> 32 #ifdef CONFIG_X86 33 #include <asm/cpufeature.h> 34 #endif 35 36 #define PREFIX "ACPI: " 37 38 #define ACPI_PROCESSOR_CLASS "processor" 39 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" 40 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 41 ACPI_MODULE_NAME("processor_perflib"); 42 43 static DEFINE_MUTEX(performance_mutex); 44 45 /* 46 * _PPC support is implemented as a CPUfreq policy notifier: 47 * This means each time a CPUfreq driver registered also with 48 * the ACPI core is asked to change the speed policy, the maximum 49 * value is adjusted so that it is within the platform limit. 50 * 51 * Also, when a new platform limit value is detected, the CPUfreq 52 * policy is adjusted accordingly. 53 */ 54 55 /* ignore_ppc: 56 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet 57 * ignore _PPC 58 * 0 -> cpufreq low level drivers initialized -> consider _PPC values 59 * 1 -> ignore _PPC totally -> forced by user through boot param 60 */ 61 static int ignore_ppc = -1; 62 module_param(ignore_ppc, int, 0644); 63 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ 64 "limited by BIOS, this should help"); 65 66 #define PPC_REGISTERED 1 67 #define PPC_IN_USE 2 68 69 static int acpi_processor_ppc_status; 70 71 static int acpi_processor_ppc_notifier(struct notifier_block *nb, 72 unsigned long event, void *data) 73 { 74 struct cpufreq_policy *policy = data; 75 struct acpi_processor *pr; 76 unsigned int ppc = 0; 77 78 if (ignore_ppc < 0) 79 ignore_ppc = 0; 80 81 if (ignore_ppc) 82 return 0; 83 84 if (event != CPUFREQ_ADJUST) 85 return 0; 86 87 mutex_lock(&performance_mutex); 88 89 pr = per_cpu(processors, policy->cpu); 90 if (!pr || !pr->performance) 91 goto out; 92 93 ppc = (unsigned int)pr->performance_platform_limit; 94 95 if (ppc >= pr->performance->state_count) 96 goto out; 97 98 cpufreq_verify_within_limits(policy, 0, 99 pr->performance->states[ppc]. 100 core_frequency * 1000); 101 102 out: 103 mutex_unlock(&performance_mutex); 104 105 return 0; 106 } 107 108 static struct notifier_block acpi_ppc_notifier_block = { 109 .notifier_call = acpi_processor_ppc_notifier, 110 }; 111 112 static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 113 { 114 acpi_status status = 0; 115 unsigned long long ppc = 0; 116 117 118 if (!pr) 119 return -EINVAL; 120 121 /* 122 * _PPC indicates the maximum state currently supported by the platform 123 * (e.g. 0 = states 0..n; 1 = states 1..n; etc. 124 */ 125 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); 126 127 if (status != AE_NOT_FOUND) 128 acpi_processor_ppc_status |= PPC_IN_USE; 129 130 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 131 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); 132 return -ENODEV; 133 } 134 135 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, 136 (int)ppc, ppc ? "" : "not"); 137 138 pr->performance_platform_limit = (int)ppc; 139 140 return 0; 141 } 142 143 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 144 /* 145 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status 146 * @handle: ACPI processor handle 147 * @status: the status code of _PPC evaluation 148 * 0: success. OSPM is now using the performance state specificed. 149 * 1: failure. OSPM has not changed the number of P-states in use 150 */ 151 static void acpi_processor_ppc_ost(acpi_handle handle, int status) 152 { 153 if (acpi_has_method(handle, "_OST")) 154 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, 155 status, NULL); 156 } 157 158 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) 159 { 160 int ret; 161 162 if (ignore_ppc) { 163 /* 164 * Only when it is notification event, the _OST object 165 * will be evaluated. Otherwise it is skipped. 166 */ 167 if (event_flag) 168 acpi_processor_ppc_ost(pr->handle, 1); 169 return; 170 } 171 172 ret = acpi_processor_get_platform_limit(pr); 173 /* 174 * Only when it is notification event, the _OST object 175 * will be evaluated. Otherwise it is skipped. 176 */ 177 if (event_flag) { 178 if (ret < 0) 179 acpi_processor_ppc_ost(pr->handle, 1); 180 else 181 acpi_processor_ppc_ost(pr->handle, 0); 182 } 183 if (ret >= 0) 184 cpufreq_update_policy(pr->id); 185 } 186 187 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 188 { 189 struct acpi_processor *pr; 190 191 pr = per_cpu(processors, cpu); 192 if (!pr || !pr->performance || !pr->performance->state_count) 193 return -ENODEV; 194 *limit = pr->performance->states[pr->performance_platform_limit]. 195 core_frequency * 1000; 196 return 0; 197 } 198 EXPORT_SYMBOL(acpi_processor_get_bios_limit); 199 200 void acpi_processor_ppc_init(void) 201 { 202 if (!cpufreq_register_notifier 203 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 204 acpi_processor_ppc_status |= PPC_REGISTERED; 205 else 206 printk(KERN_DEBUG 207 "Warning: Processor Platform Limit not supported.\n"); 208 } 209 210 void acpi_processor_ppc_exit(void) 211 { 212 if (acpi_processor_ppc_status & PPC_REGISTERED) 213 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 214 CPUFREQ_POLICY_NOTIFIER); 215 216 acpi_processor_ppc_status &= ~PPC_REGISTERED; 217 } 218 219 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 220 { 221 int result = 0; 222 acpi_status status = 0; 223 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 224 union acpi_object *pct = NULL; 225 union acpi_object obj = { 0 }; 226 227 228 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 229 if (ACPI_FAILURE(status)) { 230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 231 return -ENODEV; 232 } 233 234 pct = (union acpi_object *)buffer.pointer; 235 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 236 || (pct->package.count != 2)) { 237 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 238 result = -EFAULT; 239 goto end; 240 } 241 242 /* 243 * control_register 244 */ 245 246 obj = pct->package.elements[0]; 247 248 if ((obj.type != ACPI_TYPE_BUFFER) 249 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 250 || (obj.buffer.pointer == NULL)) { 251 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 252 result = -EFAULT; 253 goto end; 254 } 255 memcpy(&pr->performance->control_register, obj.buffer.pointer, 256 sizeof(struct acpi_pct_register)); 257 258 /* 259 * status_register 260 */ 261 262 obj = pct->package.elements[1]; 263 264 if ((obj.type != ACPI_TYPE_BUFFER) 265 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 266 || (obj.buffer.pointer == NULL)) { 267 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 268 result = -EFAULT; 269 goto end; 270 } 271 272 memcpy(&pr->performance->status_register, obj.buffer.pointer, 273 sizeof(struct acpi_pct_register)); 274 275 end: 276 kfree(buffer.pointer); 277 278 return result; 279 } 280 281 #ifdef CONFIG_X86 282 /* 283 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 284 * in their ACPI data. Calculate the real values and fix up the _PSS data. 285 */ 286 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 287 { 288 u32 hi, lo, fid, did; 289 int index = px->control & 0x00000007; 290 291 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 292 return; 293 294 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 295 || boot_cpu_data.x86 == 0x11) { 296 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 297 /* 298 * MSR C001_0064+: 299 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 300 */ 301 if (!(hi & BIT(31))) 302 return; 303 304 fid = lo & 0x3f; 305 did = (lo >> 6) & 7; 306 if (boot_cpu_data.x86 == 0x10) 307 px->core_frequency = (100 * (fid + 0x10)) >> did; 308 else 309 px->core_frequency = (100 * (fid + 8)) >> did; 310 } 311 } 312 #else 313 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 314 #endif 315 316 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 317 { 318 int result = 0; 319 acpi_status status = AE_OK; 320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 321 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 322 struct acpi_buffer state = { 0, NULL }; 323 union acpi_object *pss = NULL; 324 int i; 325 int last_invalid = -1; 326 327 328 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 329 if (ACPI_FAILURE(status)) { 330 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 331 return -ENODEV; 332 } 333 334 pss = buffer.pointer; 335 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 336 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 337 result = -EFAULT; 338 goto end; 339 } 340 341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 342 pss->package.count)); 343 344 pr->performance->state_count = pss->package.count; 345 pr->performance->states = 346 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 347 GFP_KERNEL); 348 if (!pr->performance->states) { 349 result = -ENOMEM; 350 goto end; 351 } 352 353 for (i = 0; i < pr->performance->state_count; i++) { 354 355 struct acpi_processor_px *px = &(pr->performance->states[i]); 356 357 state.length = sizeof(struct acpi_processor_px); 358 state.pointer = px; 359 360 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 361 362 status = acpi_extract_package(&(pss->package.elements[i]), 363 &format, &state); 364 if (ACPI_FAILURE(status)) { 365 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 366 result = -EFAULT; 367 kfree(pr->performance->states); 368 goto end; 369 } 370 371 amd_fixup_frequency(px, i); 372 373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 374 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 375 i, 376 (u32) px->core_frequency, 377 (u32) px->power, 378 (u32) px->transition_latency, 379 (u32) px->bus_master_latency, 380 (u32) px->control, (u32) px->status)); 381 382 /* 383 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 384 */ 385 if (!px->core_frequency || 386 ((u32)(px->core_frequency * 1000) != 387 (px->core_frequency * 1000))) { 388 printk(KERN_ERR FW_BUG PREFIX 389 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 390 pr->id, px->core_frequency); 391 if (last_invalid == -1) 392 last_invalid = i; 393 } else { 394 if (last_invalid != -1) { 395 /* 396 * Copy this valid entry over last_invalid entry 397 */ 398 memcpy(&(pr->performance->states[last_invalid]), 399 px, sizeof(struct acpi_processor_px)); 400 ++last_invalid; 401 } 402 } 403 } 404 405 if (last_invalid == 0) { 406 printk(KERN_ERR FW_BUG PREFIX 407 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 408 result = -EFAULT; 409 kfree(pr->performance->states); 410 pr->performance->states = NULL; 411 } 412 413 if (last_invalid > 0) 414 pr->performance->state_count = last_invalid; 415 416 end: 417 kfree(buffer.pointer); 418 419 return result; 420 } 421 422 int acpi_processor_get_performance_info(struct acpi_processor *pr) 423 { 424 int result = 0; 425 426 if (!pr || !pr->performance || !pr->handle) 427 return -EINVAL; 428 429 if (!acpi_has_method(pr->handle, "_PCT")) { 430 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 431 "ACPI-based processor performance control unavailable\n")); 432 return -ENODEV; 433 } 434 435 result = acpi_processor_get_performance_control(pr); 436 if (result) 437 goto update_bios; 438 439 result = acpi_processor_get_performance_states(pr); 440 if (result) 441 goto update_bios; 442 443 /* We need to call _PPC once when cpufreq starts */ 444 if (ignore_ppc != 1) 445 result = acpi_processor_get_platform_limit(pr); 446 447 return result; 448 449 /* 450 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 451 * the BIOS is older than the CPU and does not know its frequencies 452 */ 453 update_bios: 454 #ifdef CONFIG_X86 455 if (acpi_has_method(pr->handle, "_PPC")) { 456 if(boot_cpu_has(X86_FEATURE_EST)) 457 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 458 "frequency support\n"); 459 } 460 #endif 461 return result; 462 } 463 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 464 465 int acpi_processor_pstate_control(void) 466 { 467 acpi_status status; 468 469 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) 470 return 0; 471 472 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 473 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 474 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 475 476 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 477 (u32)acpi_gbl_FADT.pstate_control, 8); 478 if (ACPI_SUCCESS(status)) 479 return 1; 480 481 ACPI_EXCEPTION((AE_INFO, status, 482 "Failed to write pstate_control [0x%x] to smi_command [0x%x]", 483 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 484 return -EIO; 485 } 486 487 int acpi_processor_notify_smm(struct module *calling_module) 488 { 489 static int is_done = 0; 490 int result; 491 492 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 493 return -EBUSY; 494 495 if (!try_module_get(calling_module)) 496 return -EINVAL; 497 498 /* is_done is set to negative if an error occurred, 499 * and to postitive if _no_ error occurred, but SMM 500 * was already notified. This avoids double notification 501 * which might lead to unexpected results... 502 */ 503 if (is_done > 0) { 504 module_put(calling_module); 505 return 0; 506 } else if (is_done < 0) { 507 module_put(calling_module); 508 return is_done; 509 } 510 511 is_done = -EIO; 512 513 result = acpi_processor_pstate_control(); 514 if (!result) { 515 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 516 module_put(calling_module); 517 return 0; 518 } 519 if (result < 0) { 520 module_put(calling_module); 521 return result; 522 } 523 524 /* Success. If there's no _PPC, we need to fear nothing, so 525 * we can allow the cpufreq driver to be rmmod'ed. */ 526 is_done = 1; 527 528 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 529 module_put(calling_module); 530 531 return 0; 532 } 533 534 EXPORT_SYMBOL(acpi_processor_notify_smm); 535 536 static int acpi_processor_get_psd(struct acpi_processor *pr) 537 { 538 int result = 0; 539 acpi_status status = AE_OK; 540 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 541 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 542 struct acpi_buffer state = {0, NULL}; 543 union acpi_object *psd = NULL; 544 struct acpi_psd_package *pdomain; 545 546 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 547 if (ACPI_FAILURE(status)) { 548 return -ENODEV; 549 } 550 551 psd = buffer.pointer; 552 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 553 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 554 result = -EFAULT; 555 goto end; 556 } 557 558 if (psd->package.count != 1) { 559 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 560 result = -EFAULT; 561 goto end; 562 } 563 564 pdomain = &(pr->performance->domain_info); 565 566 state.length = sizeof(struct acpi_psd_package); 567 state.pointer = pdomain; 568 569 status = acpi_extract_package(&(psd->package.elements[0]), 570 &format, &state); 571 if (ACPI_FAILURE(status)) { 572 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 573 result = -EFAULT; 574 goto end; 575 } 576 577 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 578 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 579 result = -EFAULT; 580 goto end; 581 } 582 583 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 584 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 585 result = -EFAULT; 586 goto end; 587 } 588 589 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 590 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 591 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 592 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 593 result = -EFAULT; 594 goto end; 595 } 596 end: 597 kfree(buffer.pointer); 598 return result; 599 } 600 601 int acpi_processor_preregister_performance( 602 struct acpi_processor_performance __percpu *performance) 603 { 604 int count_target; 605 int retval = 0; 606 unsigned int i, j; 607 cpumask_var_t covered_cpus; 608 struct acpi_processor *pr; 609 struct acpi_psd_package *pdomain; 610 struct acpi_processor *match_pr; 611 struct acpi_psd_package *match_pdomain; 612 613 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 614 return -ENOMEM; 615 616 mutex_lock(&performance_mutex); 617 618 /* 619 * Check if another driver has already registered, and abort before 620 * changing pr->performance if it has. Check input data as well. 621 */ 622 for_each_possible_cpu(i) { 623 pr = per_cpu(processors, i); 624 if (!pr) { 625 /* Look only at processors in ACPI namespace */ 626 continue; 627 } 628 629 if (pr->performance) { 630 retval = -EBUSY; 631 goto err_out; 632 } 633 634 if (!performance || !per_cpu_ptr(performance, i)) { 635 retval = -EINVAL; 636 goto err_out; 637 } 638 } 639 640 /* Call _PSD for all CPUs */ 641 for_each_possible_cpu(i) { 642 pr = per_cpu(processors, i); 643 if (!pr) 644 continue; 645 646 pr->performance = per_cpu_ptr(performance, i); 647 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 648 if (acpi_processor_get_psd(pr)) { 649 retval = -EINVAL; 650 continue; 651 } 652 } 653 if (retval) 654 goto err_ret; 655 656 /* 657 * Now that we have _PSD data from all CPUs, lets setup P-state 658 * domain info. 659 */ 660 for_each_possible_cpu(i) { 661 pr = per_cpu(processors, i); 662 if (!pr) 663 continue; 664 665 if (cpumask_test_cpu(i, covered_cpus)) 666 continue; 667 668 pdomain = &(pr->performance->domain_info); 669 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 670 cpumask_set_cpu(i, covered_cpus); 671 if (pdomain->num_processors <= 1) 672 continue; 673 674 /* Validate the Domain info */ 675 count_target = pdomain->num_processors; 676 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 677 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 678 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 679 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 680 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 681 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 682 683 for_each_possible_cpu(j) { 684 if (i == j) 685 continue; 686 687 match_pr = per_cpu(processors, j); 688 if (!match_pr) 689 continue; 690 691 match_pdomain = &(match_pr->performance->domain_info); 692 if (match_pdomain->domain != pdomain->domain) 693 continue; 694 695 /* Here i and j are in the same domain */ 696 697 if (match_pdomain->num_processors != count_target) { 698 retval = -EINVAL; 699 goto err_ret; 700 } 701 702 if (pdomain->coord_type != match_pdomain->coord_type) { 703 retval = -EINVAL; 704 goto err_ret; 705 } 706 707 cpumask_set_cpu(j, covered_cpus); 708 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 709 } 710 711 for_each_possible_cpu(j) { 712 if (i == j) 713 continue; 714 715 match_pr = per_cpu(processors, j); 716 if (!match_pr) 717 continue; 718 719 match_pdomain = &(match_pr->performance->domain_info); 720 if (match_pdomain->domain != pdomain->domain) 721 continue; 722 723 match_pr->performance->shared_type = 724 pr->performance->shared_type; 725 cpumask_copy(match_pr->performance->shared_cpu_map, 726 pr->performance->shared_cpu_map); 727 } 728 } 729 730 err_ret: 731 for_each_possible_cpu(i) { 732 pr = per_cpu(processors, i); 733 if (!pr || !pr->performance) 734 continue; 735 736 /* Assume no coordination on any error parsing domain info */ 737 if (retval) { 738 cpumask_clear(pr->performance->shared_cpu_map); 739 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 740 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 741 } 742 pr->performance = NULL; /* Will be set for real in register */ 743 } 744 745 err_out: 746 mutex_unlock(&performance_mutex); 747 free_cpumask_var(covered_cpus); 748 return retval; 749 } 750 EXPORT_SYMBOL(acpi_processor_preregister_performance); 751 752 int 753 acpi_processor_register_performance(struct acpi_processor_performance 754 *performance, unsigned int cpu) 755 { 756 struct acpi_processor *pr; 757 758 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 759 return -EINVAL; 760 761 mutex_lock(&performance_mutex); 762 763 pr = per_cpu(processors, cpu); 764 if (!pr) { 765 mutex_unlock(&performance_mutex); 766 return -ENODEV; 767 } 768 769 if (pr->performance) { 770 mutex_unlock(&performance_mutex); 771 return -EBUSY; 772 } 773 774 WARN_ON(!performance); 775 776 pr->performance = performance; 777 778 if (acpi_processor_get_performance_info(pr)) { 779 pr->performance = NULL; 780 mutex_unlock(&performance_mutex); 781 return -EIO; 782 } 783 784 mutex_unlock(&performance_mutex); 785 return 0; 786 } 787 788 EXPORT_SYMBOL(acpi_processor_register_performance); 789 790 void acpi_processor_unregister_performance(unsigned int cpu) 791 { 792 struct acpi_processor *pr; 793 794 mutex_lock(&performance_mutex); 795 796 pr = per_cpu(processors, cpu); 797 if (!pr) { 798 mutex_unlock(&performance_mutex); 799 return; 800 } 801 802 if (pr->performance) 803 kfree(pr->performance->states); 804 pr->performance = NULL; 805 806 mutex_unlock(&performance_mutex); 807 808 return; 809 } 810 811 EXPORT_SYMBOL(acpi_processor_unregister_performance); 812