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 #include <linux/slab.h> 34 35 #ifdef CONFIG_X86 36 #include <asm/cpufeature.h> 37 #endif 38 39 #include <acpi/acpi_bus.h> 40 #include <acpi/acpi_drivers.h> 41 #include <acpi/processor.h> 42 43 #define PREFIX "ACPI: " 44 45 #define ACPI_PROCESSOR_CLASS "processor" 46 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" 47 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 48 ACPI_MODULE_NAME("processor_perflib"); 49 50 static DEFINE_MUTEX(performance_mutex); 51 52 /* 53 * _PPC support is implemented as a CPUfreq policy notifier: 54 * This means each time a CPUfreq driver registered also with 55 * the ACPI core is asked to change the speed policy, the maximum 56 * value is adjusted so that it is within the platform limit. 57 * 58 * Also, when a new platform limit value is detected, the CPUfreq 59 * policy is adjusted accordingly. 60 */ 61 62 /* ignore_ppc: 63 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet 64 * ignore _PPC 65 * 0 -> cpufreq low level drivers initialized -> consider _PPC values 66 * 1 -> ignore _PPC totally -> forced by user through boot param 67 */ 68 static int ignore_ppc = -1; 69 module_param(ignore_ppc, int, 0644); 70 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ 71 "limited by BIOS, this should help"); 72 73 #define PPC_REGISTERED 1 74 #define PPC_IN_USE 2 75 76 static int acpi_processor_ppc_status; 77 78 static int acpi_processor_ppc_notifier(struct notifier_block *nb, 79 unsigned long event, void *data) 80 { 81 struct cpufreq_policy *policy = data; 82 struct acpi_processor *pr; 83 unsigned int ppc = 0; 84 85 if (event == CPUFREQ_START && ignore_ppc <= 0) { 86 ignore_ppc = 0; 87 return 0; 88 } 89 90 if (ignore_ppc) 91 return 0; 92 93 if (event != CPUFREQ_INCOMPATIBLE) 94 return 0; 95 96 mutex_lock(&performance_mutex); 97 98 pr = per_cpu(processors, policy->cpu); 99 if (!pr || !pr->performance) 100 goto out; 101 102 ppc = (unsigned int)pr->performance_platform_limit; 103 104 if (ppc >= pr->performance->state_count) 105 goto out; 106 107 cpufreq_verify_within_limits(policy, 0, 108 pr->performance->states[ppc]. 109 core_frequency * 1000); 110 111 out: 112 mutex_unlock(&performance_mutex); 113 114 return 0; 115 } 116 117 static struct notifier_block acpi_ppc_notifier_block = { 118 .notifier_call = acpi_processor_ppc_notifier, 119 }; 120 121 static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 122 { 123 acpi_status status = 0; 124 unsigned long long ppc = 0; 125 126 127 if (!pr) 128 return -EINVAL; 129 130 /* 131 * _PPC indicates the maximum state currently supported by the platform 132 * (e.g. 0 = states 0..n; 1 = states 1..n; etc. 133 */ 134 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); 135 136 if (status != AE_NOT_FOUND) 137 acpi_processor_ppc_status |= PPC_IN_USE; 138 139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 140 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); 141 return -ENODEV; 142 } 143 144 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, 145 (int)ppc, ppc ? "" : "not"); 146 147 pr->performance_platform_limit = (int)ppc; 148 149 return 0; 150 } 151 152 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 153 /* 154 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status 155 * @handle: ACPI processor handle 156 * @status: the status code of _PPC evaluation 157 * 0: success. OSPM is now using the performance state specificed. 158 * 1: failure. OSPM has not changed the number of P-states in use 159 */ 160 static void acpi_processor_ppc_ost(acpi_handle handle, int status) 161 { 162 union acpi_object params[2] = { 163 {.type = ACPI_TYPE_INTEGER,}, 164 {.type = ACPI_TYPE_INTEGER,}, 165 }; 166 struct acpi_object_list arg_list = {2, params}; 167 168 if (acpi_has_method(handle, "_OST")) { 169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE; 170 params[1].integer.value = status; 171 acpi_evaluate_object(handle, "_OST", &arg_list, NULL); 172 } 173 } 174 175 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) 176 { 177 int ret; 178 179 if (ignore_ppc) { 180 /* 181 * Only when it is notification event, the _OST object 182 * will be evaluated. Otherwise it is skipped. 183 */ 184 if (event_flag) 185 acpi_processor_ppc_ost(pr->handle, 1); 186 return 0; 187 } 188 189 ret = acpi_processor_get_platform_limit(pr); 190 /* 191 * Only when it is notification event, the _OST object 192 * will be evaluated. Otherwise it is skipped. 193 */ 194 if (event_flag) { 195 if (ret < 0) 196 acpi_processor_ppc_ost(pr->handle, 1); 197 else 198 acpi_processor_ppc_ost(pr->handle, 0); 199 } 200 if (ret < 0) 201 return (ret); 202 else 203 return cpufreq_update_policy(pr->id); 204 } 205 206 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 207 { 208 struct acpi_processor *pr; 209 210 pr = per_cpu(processors, cpu); 211 if (!pr || !pr->performance || !pr->performance->state_count) 212 return -ENODEV; 213 *limit = pr->performance->states[pr->performance_platform_limit]. 214 core_frequency * 1000; 215 return 0; 216 } 217 EXPORT_SYMBOL(acpi_processor_get_bios_limit); 218 219 void acpi_processor_ppc_init(void) 220 { 221 if (!cpufreq_register_notifier 222 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 223 acpi_processor_ppc_status |= PPC_REGISTERED; 224 else 225 printk(KERN_DEBUG 226 "Warning: Processor Platform Limit not supported.\n"); 227 } 228 229 void acpi_processor_ppc_exit(void) 230 { 231 if (acpi_processor_ppc_status & PPC_REGISTERED) 232 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 233 CPUFREQ_POLICY_NOTIFIER); 234 235 acpi_processor_ppc_status &= ~PPC_REGISTERED; 236 } 237 238 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 239 { 240 int result = 0; 241 acpi_status status = 0; 242 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 243 union acpi_object *pct = NULL; 244 union acpi_object obj = { 0 }; 245 246 247 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 248 if (ACPI_FAILURE(status)) { 249 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 250 return -ENODEV; 251 } 252 253 pct = (union acpi_object *)buffer.pointer; 254 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 255 || (pct->package.count != 2)) { 256 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 257 result = -EFAULT; 258 goto end; 259 } 260 261 /* 262 * control_register 263 */ 264 265 obj = pct->package.elements[0]; 266 267 if ((obj.type != ACPI_TYPE_BUFFER) 268 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 269 || (obj.buffer.pointer == NULL)) { 270 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 271 result = -EFAULT; 272 goto end; 273 } 274 memcpy(&pr->performance->control_register, obj.buffer.pointer, 275 sizeof(struct acpi_pct_register)); 276 277 /* 278 * status_register 279 */ 280 281 obj = pct->package.elements[1]; 282 283 if ((obj.type != ACPI_TYPE_BUFFER) 284 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 285 || (obj.buffer.pointer == NULL)) { 286 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 287 result = -EFAULT; 288 goto end; 289 } 290 291 memcpy(&pr->performance->status_register, obj.buffer.pointer, 292 sizeof(struct acpi_pct_register)); 293 294 end: 295 kfree(buffer.pointer); 296 297 return result; 298 } 299 300 #ifdef CONFIG_X86 301 /* 302 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 303 * in their ACPI data. Calculate the real values and fix up the _PSS data. 304 */ 305 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 306 { 307 u32 hi, lo, fid, did; 308 int index = px->control & 0x00000007; 309 310 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 311 return; 312 313 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 314 || boot_cpu_data.x86 == 0x11) { 315 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 316 /* 317 * MSR C001_0064+: 318 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 319 */ 320 if (!(hi & BIT(31))) 321 return; 322 323 fid = lo & 0x3f; 324 did = (lo >> 6) & 7; 325 if (boot_cpu_data.x86 == 0x10) 326 px->core_frequency = (100 * (fid + 0x10)) >> did; 327 else 328 px->core_frequency = (100 * (fid + 8)) >> did; 329 } 330 } 331 #else 332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 333 #endif 334 335 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 336 { 337 int result = 0; 338 acpi_status status = AE_OK; 339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 340 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 341 struct acpi_buffer state = { 0, NULL }; 342 union acpi_object *pss = NULL; 343 int i; 344 int last_invalid = -1; 345 346 347 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 348 if (ACPI_FAILURE(status)) { 349 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 350 return -ENODEV; 351 } 352 353 pss = buffer.pointer; 354 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 355 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 356 result = -EFAULT; 357 goto end; 358 } 359 360 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 361 pss->package.count)); 362 363 pr->performance->state_count = pss->package.count; 364 pr->performance->states = 365 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 366 GFP_KERNEL); 367 if (!pr->performance->states) { 368 result = -ENOMEM; 369 goto end; 370 } 371 372 for (i = 0; i < pr->performance->state_count; i++) { 373 374 struct acpi_processor_px *px = &(pr->performance->states[i]); 375 376 state.length = sizeof(struct acpi_processor_px); 377 state.pointer = px; 378 379 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 380 381 status = acpi_extract_package(&(pss->package.elements[i]), 382 &format, &state); 383 if (ACPI_FAILURE(status)) { 384 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 385 result = -EFAULT; 386 kfree(pr->performance->states); 387 goto end; 388 } 389 390 amd_fixup_frequency(px, i); 391 392 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 393 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 394 i, 395 (u32) px->core_frequency, 396 (u32) px->power, 397 (u32) px->transition_latency, 398 (u32) px->bus_master_latency, 399 (u32) px->control, (u32) px->status)); 400 401 /* 402 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 403 */ 404 if (!px->core_frequency || 405 ((u32)(px->core_frequency * 1000) != 406 (px->core_frequency * 1000))) { 407 printk(KERN_ERR FW_BUG PREFIX 408 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 409 pr->id, px->core_frequency); 410 if (last_invalid == -1) 411 last_invalid = i; 412 } else { 413 if (last_invalid != -1) { 414 /* 415 * Copy this valid entry over last_invalid entry 416 */ 417 memcpy(&(pr->performance->states[last_invalid]), 418 px, sizeof(struct acpi_processor_px)); 419 ++last_invalid; 420 } 421 } 422 } 423 424 if (last_invalid == 0) { 425 printk(KERN_ERR FW_BUG PREFIX 426 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 427 result = -EFAULT; 428 kfree(pr->performance->states); 429 pr->performance->states = NULL; 430 } 431 432 if (last_invalid > 0) 433 pr->performance->state_count = last_invalid; 434 435 end: 436 kfree(buffer.pointer); 437 438 return result; 439 } 440 441 int acpi_processor_get_performance_info(struct acpi_processor *pr) 442 { 443 int result = 0; 444 445 if (!pr || !pr->performance || !pr->handle) 446 return -EINVAL; 447 448 if (!acpi_has_method(pr->handle, "_PCT")) { 449 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 450 "ACPI-based processor performance control unavailable\n")); 451 return -ENODEV; 452 } 453 454 result = acpi_processor_get_performance_control(pr); 455 if (result) 456 goto update_bios; 457 458 result = acpi_processor_get_performance_states(pr); 459 if (result) 460 goto update_bios; 461 462 /* We need to call _PPC once when cpufreq starts */ 463 if (ignore_ppc != 1) 464 result = acpi_processor_get_platform_limit(pr); 465 466 return result; 467 468 /* 469 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 470 * the BIOS is older than the CPU and does not know its frequencies 471 */ 472 update_bios: 473 #ifdef CONFIG_X86 474 if (acpi_has_method(pr->handle, "_PPC")) { 475 if(boot_cpu_has(X86_FEATURE_EST)) 476 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 477 "frequency support\n"); 478 } 479 #endif 480 return result; 481 } 482 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 483 int acpi_processor_notify_smm(struct module *calling_module) 484 { 485 acpi_status status; 486 static int is_done = 0; 487 488 489 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 490 return -EBUSY; 491 492 if (!try_module_get(calling_module)) 493 return -EINVAL; 494 495 /* is_done is set to negative if an error occurred, 496 * and to postitive if _no_ error occurred, but SMM 497 * was already notified. This avoids double notification 498 * which might lead to unexpected results... 499 */ 500 if (is_done > 0) { 501 module_put(calling_module); 502 return 0; 503 } else if (is_done < 0) { 504 module_put(calling_module); 505 return is_done; 506 } 507 508 is_done = -EIO; 509 510 /* Can't write pstate_control to smi_command if either value is zero */ 511 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { 512 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 513 module_put(calling_module); 514 return 0; 515 } 516 517 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 518 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 519 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 520 521 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 522 (u32) acpi_gbl_FADT.pstate_control, 8); 523 if (ACPI_FAILURE(status)) { 524 ACPI_EXCEPTION((AE_INFO, status, 525 "Failed to write pstate_control [0x%x] to " 526 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, 527 acpi_gbl_FADT.smi_command)); 528 module_put(calling_module); 529 return status; 530 } 531 532 /* Success. If there's no _PPC, we need to fear nothing, so 533 * we can allow the cpufreq driver to be rmmod'ed. */ 534 is_done = 1; 535 536 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 537 module_put(calling_module); 538 539 return 0; 540 } 541 542 EXPORT_SYMBOL(acpi_processor_notify_smm); 543 544 static int acpi_processor_get_psd(struct acpi_processor *pr) 545 { 546 int result = 0; 547 acpi_status status = AE_OK; 548 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 549 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 550 struct acpi_buffer state = {0, NULL}; 551 union acpi_object *psd = NULL; 552 struct acpi_psd_package *pdomain; 553 554 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 555 if (ACPI_FAILURE(status)) { 556 return -ENODEV; 557 } 558 559 psd = buffer.pointer; 560 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 561 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 562 result = -EFAULT; 563 goto end; 564 } 565 566 if (psd->package.count != 1) { 567 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 568 result = -EFAULT; 569 goto end; 570 } 571 572 pdomain = &(pr->performance->domain_info); 573 574 state.length = sizeof(struct acpi_psd_package); 575 state.pointer = pdomain; 576 577 status = acpi_extract_package(&(psd->package.elements[0]), 578 &format, &state); 579 if (ACPI_FAILURE(status)) { 580 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 581 result = -EFAULT; 582 goto end; 583 } 584 585 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 586 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 587 result = -EFAULT; 588 goto end; 589 } 590 591 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 592 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 593 result = -EFAULT; 594 goto end; 595 } 596 597 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 598 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 599 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 600 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 601 result = -EFAULT; 602 goto end; 603 } 604 end: 605 kfree(buffer.pointer); 606 return result; 607 } 608 609 int acpi_processor_preregister_performance( 610 struct acpi_processor_performance __percpu *performance) 611 { 612 int count_target; 613 int retval = 0; 614 unsigned int i, j; 615 cpumask_var_t covered_cpus; 616 struct acpi_processor *pr; 617 struct acpi_psd_package *pdomain; 618 struct acpi_processor *match_pr; 619 struct acpi_psd_package *match_pdomain; 620 621 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 622 return -ENOMEM; 623 624 mutex_lock(&performance_mutex); 625 626 /* 627 * Check if another driver has already registered, and abort before 628 * changing pr->performance if it has. Check input data as well. 629 */ 630 for_each_possible_cpu(i) { 631 pr = per_cpu(processors, i); 632 if (!pr) { 633 /* Look only at processors in ACPI namespace */ 634 continue; 635 } 636 637 if (pr->performance) { 638 retval = -EBUSY; 639 goto err_out; 640 } 641 642 if (!performance || !per_cpu_ptr(performance, i)) { 643 retval = -EINVAL; 644 goto err_out; 645 } 646 } 647 648 /* Call _PSD for all CPUs */ 649 for_each_possible_cpu(i) { 650 pr = per_cpu(processors, i); 651 if (!pr) 652 continue; 653 654 pr->performance = per_cpu_ptr(performance, i); 655 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 656 if (acpi_processor_get_psd(pr)) { 657 retval = -EINVAL; 658 continue; 659 } 660 } 661 if (retval) 662 goto err_ret; 663 664 /* 665 * Now that we have _PSD data from all CPUs, lets setup P-state 666 * domain info. 667 */ 668 for_each_possible_cpu(i) { 669 pr = per_cpu(processors, i); 670 if (!pr) 671 continue; 672 673 if (cpumask_test_cpu(i, covered_cpus)) 674 continue; 675 676 pdomain = &(pr->performance->domain_info); 677 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 678 cpumask_set_cpu(i, covered_cpus); 679 if (pdomain->num_processors <= 1) 680 continue; 681 682 /* Validate the Domain info */ 683 count_target = pdomain->num_processors; 684 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 685 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 686 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 687 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 688 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 689 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 690 691 for_each_possible_cpu(j) { 692 if (i == j) 693 continue; 694 695 match_pr = per_cpu(processors, j); 696 if (!match_pr) 697 continue; 698 699 match_pdomain = &(match_pr->performance->domain_info); 700 if (match_pdomain->domain != pdomain->domain) 701 continue; 702 703 /* Here i and j are in the same domain */ 704 705 if (match_pdomain->num_processors != count_target) { 706 retval = -EINVAL; 707 goto err_ret; 708 } 709 710 if (pdomain->coord_type != match_pdomain->coord_type) { 711 retval = -EINVAL; 712 goto err_ret; 713 } 714 715 cpumask_set_cpu(j, covered_cpus); 716 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 717 } 718 719 for_each_possible_cpu(j) { 720 if (i == j) 721 continue; 722 723 match_pr = per_cpu(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 cpumask_copy(match_pr->performance->shared_cpu_map, 734 pr->performance->shared_cpu_map); 735 } 736 } 737 738 err_ret: 739 for_each_possible_cpu(i) { 740 pr = per_cpu(processors, i); 741 if (!pr || !pr->performance) 742 continue; 743 744 /* Assume no coordination on any error parsing domain info */ 745 if (retval) { 746 cpumask_clear(pr->performance->shared_cpu_map); 747 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 748 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 749 } 750 pr->performance = NULL; /* Will be set for real in register */ 751 } 752 753 err_out: 754 mutex_unlock(&performance_mutex); 755 free_cpumask_var(covered_cpus); 756 return retval; 757 } 758 EXPORT_SYMBOL(acpi_processor_preregister_performance); 759 760 int 761 acpi_processor_register_performance(struct acpi_processor_performance 762 *performance, unsigned int cpu) 763 { 764 struct acpi_processor *pr; 765 766 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 767 return -EINVAL; 768 769 mutex_lock(&performance_mutex); 770 771 pr = per_cpu(processors, cpu); 772 if (!pr) { 773 mutex_unlock(&performance_mutex); 774 return -ENODEV; 775 } 776 777 if (pr->performance) { 778 mutex_unlock(&performance_mutex); 779 return -EBUSY; 780 } 781 782 WARN_ON(!performance); 783 784 pr->performance = performance; 785 786 if (acpi_processor_get_performance_info(pr)) { 787 pr->performance = NULL; 788 mutex_unlock(&performance_mutex); 789 return -EIO; 790 } 791 792 mutex_unlock(&performance_mutex); 793 return 0; 794 } 795 796 EXPORT_SYMBOL(acpi_processor_register_performance); 797 798 void 799 acpi_processor_unregister_performance(struct acpi_processor_performance 800 *performance, unsigned int cpu) 801 { 802 struct acpi_processor *pr; 803 804 mutex_lock(&performance_mutex); 805 806 pr = per_cpu(processors, cpu); 807 if (!pr) { 808 mutex_unlock(&performance_mutex); 809 return; 810 } 811 812 if (pr->performance) 813 kfree(pr->performance->states); 814 pr->performance = NULL; 815 816 mutex_unlock(&performance_mutex); 817 818 return; 819 } 820 821 EXPORT_SYMBOL(acpi_processor_unregister_performance); 822