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 #include <linux/acpi.h> 35 #include <acpi/processor.h> 36 #ifdef CONFIG_X86 37 #include <asm/cpufeature.h> 38 #endif 39 40 #define PREFIX "ACPI: " 41 42 #define ACPI_PROCESSOR_CLASS "processor" 43 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" 44 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 45 ACPI_MODULE_NAME("processor_perflib"); 46 47 static DEFINE_MUTEX(performance_mutex); 48 49 /* 50 * _PPC support is implemented as a CPUfreq policy notifier: 51 * This means each time a CPUfreq driver registered also with 52 * the ACPI core is asked to change the speed policy, the maximum 53 * value is adjusted so that it is within the platform limit. 54 * 55 * Also, when a new platform limit value is detected, the CPUfreq 56 * policy is adjusted accordingly. 57 */ 58 59 /* ignore_ppc: 60 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet 61 * ignore _PPC 62 * 0 -> cpufreq low level drivers initialized -> consider _PPC values 63 * 1 -> ignore _PPC totally -> forced by user through boot param 64 */ 65 static int ignore_ppc = -1; 66 module_param(ignore_ppc, int, 0644); 67 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ 68 "limited by BIOS, this should help"); 69 70 #define PPC_REGISTERED 1 71 #define PPC_IN_USE 2 72 73 static int acpi_processor_ppc_status; 74 75 static int acpi_processor_ppc_notifier(struct notifier_block *nb, 76 unsigned long event, void *data) 77 { 78 struct cpufreq_policy *policy = data; 79 struct acpi_processor *pr; 80 unsigned int ppc = 0; 81 82 if (event == CPUFREQ_START && ignore_ppc <= 0) { 83 ignore_ppc = 0; 84 return 0; 85 } 86 87 if (ignore_ppc) 88 return 0; 89 90 if (event != CPUFREQ_INCOMPATIBLE) 91 return 0; 92 93 mutex_lock(&performance_mutex); 94 95 pr = per_cpu(processors, policy->cpu); 96 if (!pr || !pr->performance) 97 goto out; 98 99 ppc = (unsigned int)pr->performance_platform_limit; 100 101 if (ppc >= pr->performance->state_count) 102 goto out; 103 104 cpufreq_verify_within_limits(policy, 0, 105 pr->performance->states[ppc]. 106 core_frequency * 1000); 107 108 out: 109 mutex_unlock(&performance_mutex); 110 111 return 0; 112 } 113 114 static struct notifier_block acpi_ppc_notifier_block = { 115 .notifier_call = acpi_processor_ppc_notifier, 116 }; 117 118 static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 119 { 120 acpi_status status = 0; 121 unsigned long long ppc = 0; 122 123 124 if (!pr) 125 return -EINVAL; 126 127 /* 128 * _PPC indicates the maximum state currently supported by the platform 129 * (e.g. 0 = states 0..n; 1 = states 1..n; etc. 130 */ 131 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); 132 133 if (status != AE_NOT_FOUND) 134 acpi_processor_ppc_status |= PPC_IN_USE; 135 136 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 137 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); 138 return -ENODEV; 139 } 140 141 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, 142 (int)ppc, ppc ? "" : "not"); 143 144 pr->performance_platform_limit = (int)ppc; 145 146 return 0; 147 } 148 149 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 150 /* 151 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status 152 * @handle: ACPI processor handle 153 * @status: the status code of _PPC evaluation 154 * 0: success. OSPM is now using the performance state specificed. 155 * 1: failure. OSPM has not changed the number of P-states in use 156 */ 157 static void acpi_processor_ppc_ost(acpi_handle handle, int status) 158 { 159 union acpi_object params[2] = { 160 {.type = ACPI_TYPE_INTEGER,}, 161 {.type = ACPI_TYPE_INTEGER,}, 162 }; 163 struct acpi_object_list arg_list = {2, params}; 164 165 if (acpi_has_method(handle, "_OST")) { 166 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE; 167 params[1].integer.value = status; 168 acpi_evaluate_object(handle, "_OST", &arg_list, NULL); 169 } 170 } 171 172 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) 173 { 174 int ret; 175 176 if (ignore_ppc) { 177 /* 178 * Only when it is notification event, the _OST object 179 * will be evaluated. Otherwise it is skipped. 180 */ 181 if (event_flag) 182 acpi_processor_ppc_ost(pr->handle, 1); 183 return 0; 184 } 185 186 ret = acpi_processor_get_platform_limit(pr); 187 /* 188 * Only when it is notification event, the _OST object 189 * will be evaluated. Otherwise it is skipped. 190 */ 191 if (event_flag) { 192 if (ret < 0) 193 acpi_processor_ppc_ost(pr->handle, 1); 194 else 195 acpi_processor_ppc_ost(pr->handle, 0); 196 } 197 if (ret < 0) 198 return (ret); 199 else 200 return cpufreq_update_policy(pr->id); 201 } 202 203 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 204 { 205 struct acpi_processor *pr; 206 207 pr = per_cpu(processors, cpu); 208 if (!pr || !pr->performance || !pr->performance->state_count) 209 return -ENODEV; 210 *limit = pr->performance->states[pr->performance_platform_limit]. 211 core_frequency * 1000; 212 return 0; 213 } 214 EXPORT_SYMBOL(acpi_processor_get_bios_limit); 215 216 void acpi_processor_ppc_init(void) 217 { 218 if (!cpufreq_register_notifier 219 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 220 acpi_processor_ppc_status |= PPC_REGISTERED; 221 else 222 printk(KERN_DEBUG 223 "Warning: Processor Platform Limit not supported.\n"); 224 } 225 226 void acpi_processor_ppc_exit(void) 227 { 228 if (acpi_processor_ppc_status & PPC_REGISTERED) 229 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 230 CPUFREQ_POLICY_NOTIFIER); 231 232 acpi_processor_ppc_status &= ~PPC_REGISTERED; 233 } 234 235 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 236 { 237 int result = 0; 238 acpi_status status = 0; 239 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 240 union acpi_object *pct = NULL; 241 union acpi_object obj = { 0 }; 242 243 244 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 245 if (ACPI_FAILURE(status)) { 246 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 247 return -ENODEV; 248 } 249 250 pct = (union acpi_object *)buffer.pointer; 251 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 252 || (pct->package.count != 2)) { 253 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 254 result = -EFAULT; 255 goto end; 256 } 257 258 /* 259 * control_register 260 */ 261 262 obj = pct->package.elements[0]; 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 (control_register)\n"); 268 result = -EFAULT; 269 goto end; 270 } 271 memcpy(&pr->performance->control_register, obj.buffer.pointer, 272 sizeof(struct acpi_pct_register)); 273 274 /* 275 * status_register 276 */ 277 278 obj = pct->package.elements[1]; 279 280 if ((obj.type != ACPI_TYPE_BUFFER) 281 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 282 || (obj.buffer.pointer == NULL)) { 283 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 284 result = -EFAULT; 285 goto end; 286 } 287 288 memcpy(&pr->performance->status_register, obj.buffer.pointer, 289 sizeof(struct acpi_pct_register)); 290 291 end: 292 kfree(buffer.pointer); 293 294 return result; 295 } 296 297 #ifdef CONFIG_X86 298 /* 299 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 300 * in their ACPI data. Calculate the real values and fix up the _PSS data. 301 */ 302 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 303 { 304 u32 hi, lo, fid, did; 305 int index = px->control & 0x00000007; 306 307 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 308 return; 309 310 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 311 || boot_cpu_data.x86 == 0x11) { 312 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 313 /* 314 * MSR C001_0064+: 315 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 316 */ 317 if (!(hi & BIT(31))) 318 return; 319 320 fid = lo & 0x3f; 321 did = (lo >> 6) & 7; 322 if (boot_cpu_data.x86 == 0x10) 323 px->core_frequency = (100 * (fid + 0x10)) >> did; 324 else 325 px->core_frequency = (100 * (fid + 8)) >> did; 326 } 327 } 328 #else 329 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 330 #endif 331 332 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 333 { 334 int result = 0; 335 acpi_status status = AE_OK; 336 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 337 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 338 struct acpi_buffer state = { 0, NULL }; 339 union acpi_object *pss = NULL; 340 int i; 341 int last_invalid = -1; 342 343 344 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 345 if (ACPI_FAILURE(status)) { 346 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 347 return -ENODEV; 348 } 349 350 pss = buffer.pointer; 351 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 352 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 353 result = -EFAULT; 354 goto end; 355 } 356 357 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 358 pss->package.count)); 359 360 pr->performance->state_count = pss->package.count; 361 pr->performance->states = 362 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 363 GFP_KERNEL); 364 if (!pr->performance->states) { 365 result = -ENOMEM; 366 goto end; 367 } 368 369 for (i = 0; i < pr->performance->state_count; i++) { 370 371 struct acpi_processor_px *px = &(pr->performance->states[i]); 372 373 state.length = sizeof(struct acpi_processor_px); 374 state.pointer = px; 375 376 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 377 378 status = acpi_extract_package(&(pss->package.elements[i]), 379 &format, &state); 380 if (ACPI_FAILURE(status)) { 381 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 382 result = -EFAULT; 383 kfree(pr->performance->states); 384 goto end; 385 } 386 387 amd_fixup_frequency(px, i); 388 389 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 390 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 391 i, 392 (u32) px->core_frequency, 393 (u32) px->power, 394 (u32) px->transition_latency, 395 (u32) px->bus_master_latency, 396 (u32) px->control, (u32) px->status)); 397 398 /* 399 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 400 */ 401 if (!px->core_frequency || 402 ((u32)(px->core_frequency * 1000) != 403 (px->core_frequency * 1000))) { 404 printk(KERN_ERR FW_BUG PREFIX 405 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 406 pr->id, px->core_frequency); 407 if (last_invalid == -1) 408 last_invalid = i; 409 } else { 410 if (last_invalid != -1) { 411 /* 412 * Copy this valid entry over last_invalid entry 413 */ 414 memcpy(&(pr->performance->states[last_invalid]), 415 px, sizeof(struct acpi_processor_px)); 416 ++last_invalid; 417 } 418 } 419 } 420 421 if (last_invalid == 0) { 422 printk(KERN_ERR FW_BUG PREFIX 423 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 424 result = -EFAULT; 425 kfree(pr->performance->states); 426 pr->performance->states = NULL; 427 } 428 429 if (last_invalid > 0) 430 pr->performance->state_count = last_invalid; 431 432 end: 433 kfree(buffer.pointer); 434 435 return result; 436 } 437 438 int acpi_processor_get_performance_info(struct acpi_processor *pr) 439 { 440 int result = 0; 441 442 if (!pr || !pr->performance || !pr->handle) 443 return -EINVAL; 444 445 if (!acpi_has_method(pr->handle, "_PCT")) { 446 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 447 "ACPI-based processor performance control unavailable\n")); 448 return -ENODEV; 449 } 450 451 result = acpi_processor_get_performance_control(pr); 452 if (result) 453 goto update_bios; 454 455 result = acpi_processor_get_performance_states(pr); 456 if (result) 457 goto update_bios; 458 459 /* We need to call _PPC once when cpufreq starts */ 460 if (ignore_ppc != 1) 461 result = acpi_processor_get_platform_limit(pr); 462 463 return result; 464 465 /* 466 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 467 * the BIOS is older than the CPU and does not know its frequencies 468 */ 469 update_bios: 470 #ifdef CONFIG_X86 471 if (acpi_has_method(pr->handle, "_PPC")) { 472 if(boot_cpu_has(X86_FEATURE_EST)) 473 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 474 "frequency support\n"); 475 } 476 #endif 477 return result; 478 } 479 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 480 int acpi_processor_notify_smm(struct module *calling_module) 481 { 482 acpi_status status; 483 static int is_done = 0; 484 485 486 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 487 return -EBUSY; 488 489 if (!try_module_get(calling_module)) 490 return -EINVAL; 491 492 /* is_done is set to negative if an error occurred, 493 * and to postitive if _no_ error occurred, but SMM 494 * was already notified. This avoids double notification 495 * which might lead to unexpected results... 496 */ 497 if (is_done > 0) { 498 module_put(calling_module); 499 return 0; 500 } else if (is_done < 0) { 501 module_put(calling_module); 502 return is_done; 503 } 504 505 is_done = -EIO; 506 507 /* Can't write pstate_control to smi_command if either value is zero */ 508 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { 509 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 510 module_put(calling_module); 511 return 0; 512 } 513 514 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 515 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 516 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 517 518 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 519 (u32) acpi_gbl_FADT.pstate_control, 8); 520 if (ACPI_FAILURE(status)) { 521 ACPI_EXCEPTION((AE_INFO, status, 522 "Failed to write pstate_control [0x%x] to " 523 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, 524 acpi_gbl_FADT.smi_command)); 525 module_put(calling_module); 526 return status; 527 } 528 529 /* Success. If there's no _PPC, we need to fear nothing, so 530 * we can allow the cpufreq driver to be rmmod'ed. */ 531 is_done = 1; 532 533 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 534 module_put(calling_module); 535 536 return 0; 537 } 538 539 EXPORT_SYMBOL(acpi_processor_notify_smm); 540 541 static int acpi_processor_get_psd(struct acpi_processor *pr) 542 { 543 int result = 0; 544 acpi_status status = AE_OK; 545 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 546 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 547 struct acpi_buffer state = {0, NULL}; 548 union acpi_object *psd = NULL; 549 struct acpi_psd_package *pdomain; 550 551 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 552 if (ACPI_FAILURE(status)) { 553 return -ENODEV; 554 } 555 556 psd = buffer.pointer; 557 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 558 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 559 result = -EFAULT; 560 goto end; 561 } 562 563 if (psd->package.count != 1) { 564 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 565 result = -EFAULT; 566 goto end; 567 } 568 569 pdomain = &(pr->performance->domain_info); 570 571 state.length = sizeof(struct acpi_psd_package); 572 state.pointer = pdomain; 573 574 status = acpi_extract_package(&(psd->package.elements[0]), 575 &format, &state); 576 if (ACPI_FAILURE(status)) { 577 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 578 result = -EFAULT; 579 goto end; 580 } 581 582 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 583 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 584 result = -EFAULT; 585 goto end; 586 } 587 588 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 589 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 590 result = -EFAULT; 591 goto end; 592 } 593 594 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 595 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 596 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 597 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 598 result = -EFAULT; 599 goto end; 600 } 601 end: 602 kfree(buffer.pointer); 603 return result; 604 } 605 606 int acpi_processor_preregister_performance( 607 struct acpi_processor_performance __percpu *performance) 608 { 609 int count_target; 610 int retval = 0; 611 unsigned int i, j; 612 cpumask_var_t covered_cpus; 613 struct acpi_processor *pr; 614 struct acpi_psd_package *pdomain; 615 struct acpi_processor *match_pr; 616 struct acpi_psd_package *match_pdomain; 617 618 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 619 return -ENOMEM; 620 621 mutex_lock(&performance_mutex); 622 623 /* 624 * Check if another driver has already registered, and abort before 625 * changing pr->performance if it has. Check input data as well. 626 */ 627 for_each_possible_cpu(i) { 628 pr = per_cpu(processors, i); 629 if (!pr) { 630 /* Look only at processors in ACPI namespace */ 631 continue; 632 } 633 634 if (pr->performance) { 635 retval = -EBUSY; 636 goto err_out; 637 } 638 639 if (!performance || !per_cpu_ptr(performance, i)) { 640 retval = -EINVAL; 641 goto err_out; 642 } 643 } 644 645 /* Call _PSD for all CPUs */ 646 for_each_possible_cpu(i) { 647 pr = per_cpu(processors, i); 648 if (!pr) 649 continue; 650 651 pr->performance = per_cpu_ptr(performance, i); 652 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 653 if (acpi_processor_get_psd(pr)) { 654 retval = -EINVAL; 655 continue; 656 } 657 } 658 if (retval) 659 goto err_ret; 660 661 /* 662 * Now that we have _PSD data from all CPUs, lets setup P-state 663 * domain info. 664 */ 665 for_each_possible_cpu(i) { 666 pr = per_cpu(processors, i); 667 if (!pr) 668 continue; 669 670 if (cpumask_test_cpu(i, covered_cpus)) 671 continue; 672 673 pdomain = &(pr->performance->domain_info); 674 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 675 cpumask_set_cpu(i, covered_cpus); 676 if (pdomain->num_processors <= 1) 677 continue; 678 679 /* Validate the Domain info */ 680 count_target = pdomain->num_processors; 681 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 682 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 683 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 684 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 685 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 686 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 687 688 for_each_possible_cpu(j) { 689 if (i == j) 690 continue; 691 692 match_pr = per_cpu(processors, j); 693 if (!match_pr) 694 continue; 695 696 match_pdomain = &(match_pr->performance->domain_info); 697 if (match_pdomain->domain != pdomain->domain) 698 continue; 699 700 /* Here i and j are in the same domain */ 701 702 if (match_pdomain->num_processors != count_target) { 703 retval = -EINVAL; 704 goto err_ret; 705 } 706 707 if (pdomain->coord_type != match_pdomain->coord_type) { 708 retval = -EINVAL; 709 goto err_ret; 710 } 711 712 cpumask_set_cpu(j, covered_cpus); 713 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 714 } 715 716 for_each_possible_cpu(j) { 717 if (i == j) 718 continue; 719 720 match_pr = per_cpu(processors, j); 721 if (!match_pr) 722 continue; 723 724 match_pdomain = &(match_pr->performance->domain_info); 725 if (match_pdomain->domain != pdomain->domain) 726 continue; 727 728 match_pr->performance->shared_type = 729 pr->performance->shared_type; 730 cpumask_copy(match_pr->performance->shared_cpu_map, 731 pr->performance->shared_cpu_map); 732 } 733 } 734 735 err_ret: 736 for_each_possible_cpu(i) { 737 pr = per_cpu(processors, i); 738 if (!pr || !pr->performance) 739 continue; 740 741 /* Assume no coordination on any error parsing domain info */ 742 if (retval) { 743 cpumask_clear(pr->performance->shared_cpu_map); 744 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 745 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 746 } 747 pr->performance = NULL; /* Will be set for real in register */ 748 } 749 750 err_out: 751 mutex_unlock(&performance_mutex); 752 free_cpumask_var(covered_cpus); 753 return retval; 754 } 755 EXPORT_SYMBOL(acpi_processor_preregister_performance); 756 757 int 758 acpi_processor_register_performance(struct acpi_processor_performance 759 *performance, unsigned int cpu) 760 { 761 struct acpi_processor *pr; 762 763 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 764 return -EINVAL; 765 766 mutex_lock(&performance_mutex); 767 768 pr = per_cpu(processors, cpu); 769 if (!pr) { 770 mutex_unlock(&performance_mutex); 771 return -ENODEV; 772 } 773 774 if (pr->performance) { 775 mutex_unlock(&performance_mutex); 776 return -EBUSY; 777 } 778 779 WARN_ON(!performance); 780 781 pr->performance = performance; 782 783 if (acpi_processor_get_performance_info(pr)) { 784 pr->performance = NULL; 785 mutex_unlock(&performance_mutex); 786 return -EIO; 787 } 788 789 mutex_unlock(&performance_mutex); 790 return 0; 791 } 792 793 EXPORT_SYMBOL(acpi_processor_register_performance); 794 795 void 796 acpi_processor_unregister_performance(struct acpi_processor_performance 797 *performance, unsigned int cpu) 798 { 799 struct acpi_processor *pr; 800 801 mutex_lock(&performance_mutex); 802 803 pr = per_cpu(processors, cpu); 804 if (!pr) { 805 mutex_unlock(&performance_mutex); 806 return; 807 } 808 809 if (pr->performance) 810 kfree(pr->performance->states); 811 pr->performance = NULL; 812 813 mutex_unlock(&performance_mutex); 814 815 return; 816 } 817 818 EXPORT_SYMBOL(acpi_processor_unregister_performance); 819