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 * You should have received a copy of the GNU General Public License along 24 * with this program; if not, write to the Free Software Foundation, Inc., 25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 26 * 27 */ 28 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/cpufreq.h> 33 34 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF 35 #include <linux/proc_fs.h> 36 #include <linux/seq_file.h> 37 #include <linux/mutex.h> 38 39 #include <asm/uaccess.h> 40 #endif 41 42 #include <acpi/acpi_bus.h> 43 #include <acpi/processor.h> 44 45 #define ACPI_PROCESSOR_COMPONENT 0x01000000 46 #define ACPI_PROCESSOR_CLASS "processor" 47 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" 48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" 49 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 50 ACPI_MODULE_NAME("acpi_processor") 51 52 static DEFINE_MUTEX(performance_mutex); 53 54 /* 55 * _PPC support is implemented as a CPUfreq policy notifier: 56 * This means each time a CPUfreq driver registered also with 57 * the ACPI core is asked to change the speed policy, the maximum 58 * value is adjusted so that it is within the platform limit. 59 * 60 * Also, when a new platform limit value is detected, the CPUfreq 61 * policy is adjusted accordingly. 62 */ 63 64 #define PPC_REGISTERED 1 65 #define PPC_IN_USE 2 66 67 static int acpi_processor_ppc_status = 0; 68 69 static int acpi_processor_ppc_notifier(struct notifier_block *nb, 70 unsigned long event, void *data) 71 { 72 struct cpufreq_policy *policy = data; 73 struct acpi_processor *pr; 74 unsigned int ppc = 0; 75 76 mutex_lock(&performance_mutex); 77 78 if (event != CPUFREQ_INCOMPATIBLE) 79 goto out; 80 81 pr = processors[policy->cpu]; 82 if (!pr || !pr->performance) 83 goto out; 84 85 ppc = (unsigned int)pr->performance_platform_limit; 86 87 if (ppc >= pr->performance->state_count) 88 goto out; 89 90 cpufreq_verify_within_limits(policy, 0, 91 pr->performance->states[ppc]. 92 core_frequency * 1000); 93 94 out: 95 mutex_unlock(&performance_mutex); 96 97 return 0; 98 } 99 100 static struct notifier_block acpi_ppc_notifier_block = { 101 .notifier_call = acpi_processor_ppc_notifier, 102 }; 103 104 static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 105 { 106 acpi_status status = 0; 107 unsigned long ppc = 0; 108 109 110 if (!pr) 111 return -EINVAL; 112 113 /* 114 * _PPC indicates the maximum state currently supported by the platform 115 * (e.g. 0 = states 0..n; 1 = states 1..n; etc. 116 */ 117 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); 118 119 if (status != AE_NOT_FOUND) 120 acpi_processor_ppc_status |= PPC_IN_USE; 121 122 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 123 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); 124 return -ENODEV; 125 } 126 127 pr->performance_platform_limit = (int)ppc; 128 129 return 0; 130 } 131 132 int acpi_processor_ppc_has_changed(struct acpi_processor *pr) 133 { 134 int ret = acpi_processor_get_platform_limit(pr); 135 if (ret < 0) 136 return (ret); 137 else 138 return cpufreq_update_policy(pr->id); 139 } 140 141 void acpi_processor_ppc_init(void) 142 { 143 if (!cpufreq_register_notifier 144 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 145 acpi_processor_ppc_status |= PPC_REGISTERED; 146 else 147 printk(KERN_DEBUG 148 "Warning: Processor Platform Limit not supported.\n"); 149 } 150 151 void acpi_processor_ppc_exit(void) 152 { 153 if (acpi_processor_ppc_status & PPC_REGISTERED) 154 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 155 CPUFREQ_POLICY_NOTIFIER); 156 157 acpi_processor_ppc_status &= ~PPC_REGISTERED; 158 } 159 160 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 161 { 162 int result = 0; 163 acpi_status status = 0; 164 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 165 union acpi_object *pct = NULL; 166 union acpi_object obj = { 0 }; 167 168 169 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 170 if (ACPI_FAILURE(status)) { 171 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 172 return -ENODEV; 173 } 174 175 pct = (union acpi_object *)buffer.pointer; 176 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 177 || (pct->package.count != 2)) { 178 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 179 result = -EFAULT; 180 goto end; 181 } 182 183 /* 184 * control_register 185 */ 186 187 obj = pct->package.elements[0]; 188 189 if ((obj.type != ACPI_TYPE_BUFFER) 190 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 191 || (obj.buffer.pointer == NULL)) { 192 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 193 result = -EFAULT; 194 goto end; 195 } 196 memcpy(&pr->performance->control_register, obj.buffer.pointer, 197 sizeof(struct acpi_pct_register)); 198 199 /* 200 * status_register 201 */ 202 203 obj = pct->package.elements[1]; 204 205 if ((obj.type != ACPI_TYPE_BUFFER) 206 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 207 || (obj.buffer.pointer == NULL)) { 208 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 209 result = -EFAULT; 210 goto end; 211 } 212 213 memcpy(&pr->performance->status_register, obj.buffer.pointer, 214 sizeof(struct acpi_pct_register)); 215 216 end: 217 kfree(buffer.pointer); 218 219 return result; 220 } 221 222 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 223 { 224 int result = 0; 225 acpi_status status = AE_OK; 226 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 227 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 228 struct acpi_buffer state = { 0, NULL }; 229 union acpi_object *pss = NULL; 230 int i; 231 232 233 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 234 if (ACPI_FAILURE(status)) { 235 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 236 return -ENODEV; 237 } 238 239 pss = (union acpi_object *)buffer.pointer; 240 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 241 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 242 result = -EFAULT; 243 goto end; 244 } 245 246 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 247 pss->package.count)); 248 249 pr->performance->state_count = pss->package.count; 250 pr->performance->states = 251 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 252 GFP_KERNEL); 253 if (!pr->performance->states) { 254 result = -ENOMEM; 255 goto end; 256 } 257 258 for (i = 0; i < pr->performance->state_count; i++) { 259 260 struct acpi_processor_px *px = &(pr->performance->states[i]); 261 262 state.length = sizeof(struct acpi_processor_px); 263 state.pointer = px; 264 265 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 266 267 status = acpi_extract_package(&(pss->package.elements[i]), 268 &format, &state); 269 if (ACPI_FAILURE(status)) { 270 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 271 result = -EFAULT; 272 kfree(pr->performance->states); 273 goto end; 274 } 275 276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 277 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 278 i, 279 (u32) px->core_frequency, 280 (u32) px->power, 281 (u32) px->transition_latency, 282 (u32) px->bus_master_latency, 283 (u32) px->control, (u32) px->status)); 284 285 if (!px->core_frequency) { 286 printk(KERN_ERR PREFIX 287 "Invalid _PSS data: freq is zero\n"); 288 result = -EFAULT; 289 kfree(pr->performance->states); 290 goto end; 291 } 292 } 293 294 end: 295 kfree(buffer.pointer); 296 297 return result; 298 } 299 300 static int acpi_processor_get_performance_info(struct acpi_processor *pr) 301 { 302 int result = 0; 303 acpi_status status = AE_OK; 304 acpi_handle handle = NULL; 305 306 307 if (!pr || !pr->performance || !pr->handle) 308 return -EINVAL; 309 310 status = acpi_get_handle(pr->handle, "_PCT", &handle); 311 if (ACPI_FAILURE(status)) { 312 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 313 "ACPI-based processor performance control unavailable\n")); 314 return -ENODEV; 315 } 316 317 result = acpi_processor_get_performance_control(pr); 318 if (result) 319 return result; 320 321 result = acpi_processor_get_performance_states(pr); 322 if (result) 323 return result; 324 325 result = acpi_processor_get_platform_limit(pr); 326 if (result) 327 return result; 328 329 return 0; 330 } 331 332 int acpi_processor_notify_smm(struct module *calling_module) 333 { 334 acpi_status status; 335 static int is_done = 0; 336 337 338 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 339 return -EBUSY; 340 341 if (!try_module_get(calling_module)) 342 return -EINVAL; 343 344 /* is_done is set to negative if an error occured, 345 * and to postitive if _no_ error occured, but SMM 346 * was already notified. This avoids double notification 347 * which might lead to unexpected results... 348 */ 349 if (is_done > 0) { 350 module_put(calling_module); 351 return 0; 352 } else if (is_done < 0) { 353 module_put(calling_module); 354 return is_done; 355 } 356 357 is_done = -EIO; 358 359 /* Can't write pstate_cnt to smi_cmd if either value is zero */ 360 if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) { 361 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n")); 362 module_put(calling_module); 363 return 0; 364 } 365 366 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 367 "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", 368 acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); 369 370 /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use 371 * it anyway, so we need to support it... */ 372 if (acpi_fadt_is_v1) { 373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 374 "Using v1.0 FADT reserved value for pstate_cnt\n")); 375 } 376 377 status = acpi_os_write_port(acpi_fadt.smi_cmd, 378 (u32) acpi_fadt.pstate_cnt, 8); 379 if (ACPI_FAILURE(status)) { 380 ACPI_EXCEPTION((AE_INFO, status, 381 "Failed to write pstate_cnt [0x%x] to " 382 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt, 383 acpi_fadt.smi_cmd)); 384 module_put(calling_module); 385 return status; 386 } 387 388 /* Success. If there's no _PPC, we need to fear nothing, so 389 * we can allow the cpufreq driver to be rmmod'ed. */ 390 is_done = 1; 391 392 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 393 module_put(calling_module); 394 395 return 0; 396 } 397 398 EXPORT_SYMBOL(acpi_processor_notify_smm); 399 400 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF 401 /* /proc/acpi/processor/../performance interface (DEPRECATED) */ 402 403 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); 404 static struct file_operations acpi_processor_perf_fops = { 405 .open = acpi_processor_perf_open_fs, 406 .read = seq_read, 407 .llseek = seq_lseek, 408 .release = single_release, 409 }; 410 411 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) 412 { 413 struct acpi_processor *pr = (struct acpi_processor *)seq->private; 414 int i; 415 416 417 if (!pr) 418 goto end; 419 420 if (!pr->performance) { 421 seq_puts(seq, "<not supported>\n"); 422 goto end; 423 } 424 425 seq_printf(seq, "state count: %d\n" 426 "active state: P%d\n", 427 pr->performance->state_count, pr->performance->state); 428 429 seq_puts(seq, "states:\n"); 430 for (i = 0; i < pr->performance->state_count; i++) 431 seq_printf(seq, 432 " %cP%d: %d MHz, %d mW, %d uS\n", 433 (i == pr->performance->state ? '*' : ' '), i, 434 (u32) pr->performance->states[i].core_frequency, 435 (u32) pr->performance->states[i].power, 436 (u32) pr->performance->states[i].transition_latency); 437 438 end: 439 return 0; 440 } 441 442 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) 443 { 444 return single_open(file, acpi_processor_perf_seq_show, 445 PDE(inode)->data); 446 } 447 448 static ssize_t 449 acpi_processor_write_performance(struct file *file, 450 const char __user * buffer, 451 size_t count, loff_t * data) 452 { 453 int result = 0; 454 struct seq_file *m = (struct seq_file *)file->private_data; 455 struct acpi_processor *pr = (struct acpi_processor *)m->private; 456 struct acpi_processor_performance *perf; 457 char state_string[12] = { '\0' }; 458 unsigned int new_state = 0; 459 struct cpufreq_policy policy; 460 461 462 if (!pr || (count > sizeof(state_string) - 1)) 463 return -EINVAL; 464 465 perf = pr->performance; 466 if (!perf) 467 return -EINVAL; 468 469 if (copy_from_user(state_string, buffer, count)) 470 return -EFAULT; 471 472 state_string[count] = '\0'; 473 new_state = simple_strtoul(state_string, NULL, 0); 474 475 if (new_state >= perf->state_count) 476 return -EINVAL; 477 478 cpufreq_get_policy(&policy, pr->id); 479 480 policy.cpu = pr->id; 481 policy.min = perf->states[new_state].core_frequency * 1000; 482 policy.max = perf->states[new_state].core_frequency * 1000; 483 484 result = cpufreq_set_policy(&policy); 485 if (result) 486 return result; 487 488 return count; 489 } 490 491 static void acpi_cpufreq_add_file(struct acpi_processor *pr) 492 { 493 struct proc_dir_entry *entry = NULL; 494 struct acpi_device *device = NULL; 495 496 497 if (acpi_bus_get_device(pr->handle, &device)) 498 return; 499 500 /* add file 'performance' [R/W] */ 501 entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, 502 S_IFREG | S_IRUGO | S_IWUSR, 503 acpi_device_dir(device)); 504 if (entry){ 505 acpi_processor_perf_fops.write = acpi_processor_write_performance; 506 entry->proc_fops = &acpi_processor_perf_fops; 507 entry->data = acpi_driver_data(device); 508 entry->owner = THIS_MODULE; 509 } 510 return; 511 } 512 513 static void acpi_cpufreq_remove_file(struct acpi_processor *pr) 514 { 515 struct acpi_device *device = NULL; 516 517 518 if (acpi_bus_get_device(pr->handle, &device)) 519 return; 520 521 /* remove file 'performance' */ 522 remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, 523 acpi_device_dir(device)); 524 525 return; 526 } 527 528 #else 529 static void acpi_cpufreq_add_file(struct acpi_processor *pr) 530 { 531 return; 532 } 533 static void acpi_cpufreq_remove_file(struct acpi_processor *pr) 534 { 535 return; 536 } 537 #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ 538 539 static int acpi_processor_get_psd(struct acpi_processor *pr) 540 { 541 int result = 0; 542 acpi_status status = AE_OK; 543 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 544 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 545 struct acpi_buffer state = {0, NULL}; 546 union acpi_object *psd = NULL; 547 struct acpi_psd_package *pdomain; 548 549 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 550 if (ACPI_FAILURE(status)) { 551 return -ENODEV; 552 } 553 554 psd = (union acpi_object *) buffer.pointer; 555 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 556 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); 557 result = -EFAULT; 558 goto end; 559 } 560 561 if (psd->package.count != 1) { 562 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); 563 result = -EFAULT; 564 goto end; 565 } 566 567 pdomain = &(pr->performance->domain_info); 568 569 state.length = sizeof(struct acpi_psd_package); 570 state.pointer = pdomain; 571 572 status = acpi_extract_package(&(psd->package.elements[0]), 573 &format, &state); 574 if (ACPI_FAILURE(status)) { 575 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n")); 576 result = -EFAULT; 577 goto end; 578 } 579 580 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 581 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n")); 582 result = -EFAULT; 583 goto end; 584 } 585 586 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 587 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n")); 588 result = -EFAULT; 589 goto end; 590 } 591 592 end: 593 kfree(buffer.pointer); 594 return result; 595 } 596 597 int acpi_processor_preregister_performance( 598 struct acpi_processor_performance **performance) 599 { 600 int count, count_target; 601 int retval = 0; 602 unsigned int i, j; 603 cpumask_t covered_cpus; 604 struct acpi_processor *pr; 605 struct acpi_psd_package *pdomain; 606 struct acpi_processor *match_pr; 607 struct acpi_psd_package *match_pdomain; 608 609 mutex_lock(&performance_mutex); 610 611 retval = 0; 612 613 /* Call _PSD for all CPUs */ 614 for_each_possible_cpu(i) { 615 pr = processors[i]; 616 if (!pr) { 617 /* Look only at processors in ACPI namespace */ 618 continue; 619 } 620 621 if (pr->performance) { 622 retval = -EBUSY; 623 continue; 624 } 625 626 if (!performance || !performance[i]) { 627 retval = -EINVAL; 628 continue; 629 } 630 631 pr->performance = performance[i]; 632 cpu_set(i, pr->performance->shared_cpu_map); 633 if (acpi_processor_get_psd(pr)) { 634 retval = -EINVAL; 635 continue; 636 } 637 } 638 if (retval) 639 goto err_ret; 640 641 /* 642 * Now that we have _PSD data from all CPUs, lets setup P-state 643 * domain info. 644 */ 645 for_each_possible_cpu(i) { 646 pr = processors[i]; 647 if (!pr) 648 continue; 649 650 /* Basic validity check for domain info */ 651 pdomain = &(pr->performance->domain_info); 652 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) || 653 (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) { 654 retval = -EINVAL; 655 goto err_ret; 656 } 657 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 658 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 659 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 660 retval = -EINVAL; 661 goto err_ret; 662 } 663 } 664 665 cpus_clear(covered_cpus); 666 for_each_possible_cpu(i) { 667 pr = processors[i]; 668 if (!pr) 669 continue; 670 671 if (cpu_isset(i, covered_cpus)) 672 continue; 673 674 pdomain = &(pr->performance->domain_info); 675 cpu_set(i, pr->performance->shared_cpu_map); 676 cpu_set(i, covered_cpus); 677 if (pdomain->num_processors <= 1) 678 continue; 679 680 /* Validate the Domain info */ 681 count_target = pdomain->num_processors; 682 count = 1; 683 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 684 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 685 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 686 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 687 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 688 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 689 690 for_each_possible_cpu(j) { 691 if (i == j) 692 continue; 693 694 match_pr = processors[j]; 695 if (!match_pr) 696 continue; 697 698 match_pdomain = &(match_pr->performance->domain_info); 699 if (match_pdomain->domain != pdomain->domain) 700 continue; 701 702 /* Here i and j are in the same domain */ 703 704 if (match_pdomain->num_processors != count_target) { 705 retval = -EINVAL; 706 goto err_ret; 707 } 708 709 if (pdomain->coord_type != match_pdomain->coord_type) { 710 retval = -EINVAL; 711 goto err_ret; 712 } 713 714 cpu_set(j, covered_cpus); 715 cpu_set(j, pr->performance->shared_cpu_map); 716 count++; 717 } 718 719 for_each_possible_cpu(j) { 720 if (i == j) 721 continue; 722 723 match_pr = processors[j]; 724 if (!match_pr) 725 continue; 726 727 match_pdomain = &(match_pr->performance->domain_info); 728 if (match_pdomain->domain != pdomain->domain) 729 continue; 730 731 match_pr->performance->shared_type = 732 pr->performance->shared_type; 733 match_pr->performance->shared_cpu_map = 734 pr->performance->shared_cpu_map; 735 } 736 } 737 738 err_ret: 739 if (retval) { 740 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n")); 741 } 742 743 for_each_possible_cpu(i) { 744 pr = processors[i]; 745 if (!pr || !pr->performance) 746 continue; 747 748 /* Assume no coordination on any error parsing domain info */ 749 if (retval) { 750 cpus_clear(pr->performance->shared_cpu_map); 751 cpu_set(i, pr->performance->shared_cpu_map); 752 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 753 } 754 pr->performance = NULL; /* Will be set for real in register */ 755 } 756 757 mutex_unlock(&performance_mutex); 758 return retval; 759 } 760 EXPORT_SYMBOL(acpi_processor_preregister_performance); 761 762 763 int 764 acpi_processor_register_performance(struct acpi_processor_performance 765 *performance, unsigned int cpu) 766 { 767 struct acpi_processor *pr; 768 769 770 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 771 return -EINVAL; 772 773 mutex_lock(&performance_mutex); 774 775 pr = processors[cpu]; 776 if (!pr) { 777 mutex_unlock(&performance_mutex); 778 return -ENODEV; 779 } 780 781 if (pr->performance) { 782 mutex_unlock(&performance_mutex); 783 return -EBUSY; 784 } 785 786 WARN_ON(!performance); 787 788 pr->performance = performance; 789 790 if (acpi_processor_get_performance_info(pr)) { 791 pr->performance = NULL; 792 mutex_unlock(&performance_mutex); 793 return -EIO; 794 } 795 796 acpi_cpufreq_add_file(pr); 797 798 mutex_unlock(&performance_mutex); 799 return 0; 800 } 801 802 EXPORT_SYMBOL(acpi_processor_register_performance); 803 804 void 805 acpi_processor_unregister_performance(struct acpi_processor_performance 806 *performance, unsigned int cpu) 807 { 808 struct acpi_processor *pr; 809 810 811 mutex_lock(&performance_mutex); 812 813 pr = processors[cpu]; 814 if (!pr) { 815 mutex_unlock(&performance_mutex); 816 return; 817 } 818 819 if (pr->performance) 820 kfree(pr->performance->states); 821 pr->performance = NULL; 822 823 acpi_cpufreq_remove_file(pr); 824 825 mutex_unlock(&performance_mutex); 826 827 return; 828 } 829 830 EXPORT_SYMBOL(acpi_processor_unregister_performance); 831