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 acpi_handle temp; 168 169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE; 170 params[1].integer.value = status; 171 172 /* when there is no _OST , skip it */ 173 if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp))) 174 return; 175 176 acpi_evaluate_object(handle, "_OST", &arg_list, NULL); 177 return; 178 } 179 180 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) 181 { 182 int ret; 183 184 if (ignore_ppc) { 185 /* 186 * Only when it is notification event, the _OST object 187 * will be evaluated. Otherwise it is skipped. 188 */ 189 if (event_flag) 190 acpi_processor_ppc_ost(pr->handle, 1); 191 return 0; 192 } 193 194 ret = acpi_processor_get_platform_limit(pr); 195 /* 196 * Only when it is notification event, the _OST object 197 * will be evaluated. Otherwise it is skipped. 198 */ 199 if (event_flag) { 200 if (ret < 0) 201 acpi_processor_ppc_ost(pr->handle, 1); 202 else 203 acpi_processor_ppc_ost(pr->handle, 0); 204 } 205 if (ret < 0) 206 return (ret); 207 else 208 return cpufreq_update_policy(pr->id); 209 } 210 211 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) 212 { 213 struct acpi_processor *pr; 214 215 pr = per_cpu(processors, cpu); 216 if (!pr || !pr->performance || !pr->performance->state_count) 217 return -ENODEV; 218 *limit = pr->performance->states[pr->performance_platform_limit]. 219 core_frequency * 1000; 220 return 0; 221 } 222 EXPORT_SYMBOL(acpi_processor_get_bios_limit); 223 224 void acpi_processor_ppc_init(void) 225 { 226 if (!cpufreq_register_notifier 227 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) 228 acpi_processor_ppc_status |= PPC_REGISTERED; 229 else 230 printk(KERN_DEBUG 231 "Warning: Processor Platform Limit not supported.\n"); 232 } 233 234 void acpi_processor_ppc_exit(void) 235 { 236 if (acpi_processor_ppc_status & PPC_REGISTERED) 237 cpufreq_unregister_notifier(&acpi_ppc_notifier_block, 238 CPUFREQ_POLICY_NOTIFIER); 239 240 acpi_processor_ppc_status &= ~PPC_REGISTERED; 241 } 242 243 /* 244 * Do a quick check if the systems looks like it should use ACPI 245 * cpufreq. We look at a _PCT method being available, but don't 246 * do a whole lot of sanity checks. 247 */ 248 void acpi_processor_load_module(struct acpi_processor *pr) 249 { 250 static int requested; 251 acpi_status status = 0; 252 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 253 254 if (!arch_has_acpi_pdc() || requested) 255 return; 256 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 257 if (!ACPI_FAILURE(status)) { 258 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n"); 259 request_module_nowait("acpi_cpufreq"); 260 requested = 1; 261 } 262 kfree(buffer.pointer); 263 } 264 265 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 266 { 267 int result = 0; 268 acpi_status status = 0; 269 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 270 union acpi_object *pct = NULL; 271 union acpi_object obj = { 0 }; 272 273 274 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 275 if (ACPI_FAILURE(status)) { 276 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 277 return -ENODEV; 278 } 279 280 pct = (union acpi_object *)buffer.pointer; 281 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 282 || (pct->package.count != 2)) { 283 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 284 result = -EFAULT; 285 goto end; 286 } 287 288 /* 289 * control_register 290 */ 291 292 obj = pct->package.elements[0]; 293 294 if ((obj.type != ACPI_TYPE_BUFFER) 295 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 296 || (obj.buffer.pointer == NULL)) { 297 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 298 result = -EFAULT; 299 goto end; 300 } 301 memcpy(&pr->performance->control_register, obj.buffer.pointer, 302 sizeof(struct acpi_pct_register)); 303 304 /* 305 * status_register 306 */ 307 308 obj = pct->package.elements[1]; 309 310 if ((obj.type != ACPI_TYPE_BUFFER) 311 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 312 || (obj.buffer.pointer == NULL)) { 313 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 314 result = -EFAULT; 315 goto end; 316 } 317 318 memcpy(&pr->performance->status_register, obj.buffer.pointer, 319 sizeof(struct acpi_pct_register)); 320 321 end: 322 kfree(buffer.pointer); 323 324 return result; 325 } 326 327 #ifdef CONFIG_X86 328 /* 329 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 330 * in their ACPI data. Calculate the real values and fix up the _PSS data. 331 */ 332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 333 { 334 u32 hi, lo, fid, did; 335 int index = px->control & 0x00000007; 336 337 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 338 return; 339 340 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 341 || boot_cpu_data.x86 == 0x11) { 342 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 343 fid = lo & 0x3f; 344 did = (lo >> 6) & 7; 345 if (boot_cpu_data.x86 == 0x10) 346 px->core_frequency = (100 * (fid + 0x10)) >> did; 347 else 348 px->core_frequency = (100 * (fid + 8)) >> did; 349 } 350 } 351 #else 352 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 353 #endif 354 355 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 356 { 357 int result = 0; 358 acpi_status status = AE_OK; 359 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 360 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 361 struct acpi_buffer state = { 0, NULL }; 362 union acpi_object *pss = NULL; 363 int i; 364 int last_invalid = -1; 365 366 367 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 368 if (ACPI_FAILURE(status)) { 369 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 370 return -ENODEV; 371 } 372 373 pss = buffer.pointer; 374 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 375 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 376 result = -EFAULT; 377 goto end; 378 } 379 380 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 381 pss->package.count)); 382 383 pr->performance->state_count = pss->package.count; 384 pr->performance->states = 385 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 386 GFP_KERNEL); 387 if (!pr->performance->states) { 388 result = -ENOMEM; 389 goto end; 390 } 391 392 for (i = 0; i < pr->performance->state_count; i++) { 393 394 struct acpi_processor_px *px = &(pr->performance->states[i]); 395 396 state.length = sizeof(struct acpi_processor_px); 397 state.pointer = px; 398 399 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 400 401 status = acpi_extract_package(&(pss->package.elements[i]), 402 &format, &state); 403 if (ACPI_FAILURE(status)) { 404 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 405 result = -EFAULT; 406 kfree(pr->performance->states); 407 goto end; 408 } 409 410 amd_fixup_frequency(px, i); 411 412 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 413 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 414 i, 415 (u32) px->core_frequency, 416 (u32) px->power, 417 (u32) px->transition_latency, 418 (u32) px->bus_master_latency, 419 (u32) px->control, (u32) px->status)); 420 421 /* 422 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 423 */ 424 if (!px->core_frequency || 425 ((u32)(px->core_frequency * 1000) != 426 (px->core_frequency * 1000))) { 427 printk(KERN_ERR FW_BUG PREFIX 428 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 429 pr->id, px->core_frequency); 430 if (last_invalid == -1) 431 last_invalid = i; 432 } else { 433 if (last_invalid != -1) { 434 /* 435 * Copy this valid entry over last_invalid entry 436 */ 437 memcpy(&(pr->performance->states[last_invalid]), 438 px, sizeof(struct acpi_processor_px)); 439 ++last_invalid; 440 } 441 } 442 } 443 444 if (last_invalid == 0) { 445 printk(KERN_ERR FW_BUG PREFIX 446 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 447 result = -EFAULT; 448 kfree(pr->performance->states); 449 pr->performance->states = NULL; 450 } 451 452 if (last_invalid > 0) 453 pr->performance->state_count = last_invalid; 454 455 end: 456 kfree(buffer.pointer); 457 458 return result; 459 } 460 461 static int acpi_processor_get_performance_info(struct acpi_processor *pr) 462 { 463 int result = 0; 464 acpi_status status = AE_OK; 465 acpi_handle handle = NULL; 466 467 if (!pr || !pr->performance || !pr->handle) 468 return -EINVAL; 469 470 status = acpi_get_handle(pr->handle, "_PCT", &handle); 471 if (ACPI_FAILURE(status)) { 472 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 473 "ACPI-based processor performance control unavailable\n")); 474 return -ENODEV; 475 } 476 477 result = acpi_processor_get_performance_control(pr); 478 if (result) 479 goto update_bios; 480 481 result = acpi_processor_get_performance_states(pr); 482 if (result) 483 goto update_bios; 484 485 /* We need to call _PPC once when cpufreq starts */ 486 if (ignore_ppc != 1) 487 result = acpi_processor_get_platform_limit(pr); 488 489 return result; 490 491 /* 492 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 493 * the BIOS is older than the CPU and does not know its frequencies 494 */ 495 update_bios: 496 #ifdef CONFIG_X86 497 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ 498 if(boot_cpu_has(X86_FEATURE_EST)) 499 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 500 "frequency support\n"); 501 } 502 #endif 503 return result; 504 } 505 506 int acpi_processor_notify_smm(struct module *calling_module) 507 { 508 acpi_status status; 509 static int is_done = 0; 510 511 512 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 513 return -EBUSY; 514 515 if (!try_module_get(calling_module)) 516 return -EINVAL; 517 518 /* is_done is set to negative if an error occurred, 519 * and to postitive if _no_ error occurred, but SMM 520 * was already notified. This avoids double notification 521 * which might lead to unexpected results... 522 */ 523 if (is_done > 0) { 524 module_put(calling_module); 525 return 0; 526 } else if (is_done < 0) { 527 module_put(calling_module); 528 return is_done; 529 } 530 531 is_done = -EIO; 532 533 /* Can't write pstate_control to smi_command if either value is zero */ 534 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { 535 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 536 module_put(calling_module); 537 return 0; 538 } 539 540 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 541 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 542 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 543 544 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 545 (u32) acpi_gbl_FADT.pstate_control, 8); 546 if (ACPI_FAILURE(status)) { 547 ACPI_EXCEPTION((AE_INFO, status, 548 "Failed to write pstate_control [0x%x] to " 549 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, 550 acpi_gbl_FADT.smi_command)); 551 module_put(calling_module); 552 return status; 553 } 554 555 /* Success. If there's no _PPC, we need to fear nothing, so 556 * we can allow the cpufreq driver to be rmmod'ed. */ 557 is_done = 1; 558 559 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 560 module_put(calling_module); 561 562 return 0; 563 } 564 565 EXPORT_SYMBOL(acpi_processor_notify_smm); 566 567 static int acpi_processor_get_psd(struct acpi_processor *pr) 568 { 569 int result = 0; 570 acpi_status status = AE_OK; 571 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 572 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 573 struct acpi_buffer state = {0, NULL}; 574 union acpi_object *psd = NULL; 575 struct acpi_psd_package *pdomain; 576 577 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 578 if (ACPI_FAILURE(status)) { 579 return -ENODEV; 580 } 581 582 psd = buffer.pointer; 583 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 584 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 585 result = -EFAULT; 586 goto end; 587 } 588 589 if (psd->package.count != 1) { 590 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 591 result = -EFAULT; 592 goto end; 593 } 594 595 pdomain = &(pr->performance->domain_info); 596 597 state.length = sizeof(struct acpi_psd_package); 598 state.pointer = pdomain; 599 600 status = acpi_extract_package(&(psd->package.elements[0]), 601 &format, &state); 602 if (ACPI_FAILURE(status)) { 603 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 604 result = -EFAULT; 605 goto end; 606 } 607 608 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 609 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 610 result = -EFAULT; 611 goto end; 612 } 613 614 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 615 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 616 result = -EFAULT; 617 goto end; 618 } 619 620 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 621 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 622 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 623 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 624 result = -EFAULT; 625 goto end; 626 } 627 end: 628 kfree(buffer.pointer); 629 return result; 630 } 631 632 int acpi_processor_preregister_performance( 633 struct acpi_processor_performance __percpu *performance) 634 { 635 int count, count_target; 636 int retval = 0; 637 unsigned int i, j; 638 cpumask_var_t covered_cpus; 639 struct acpi_processor *pr; 640 struct acpi_psd_package *pdomain; 641 struct acpi_processor *match_pr; 642 struct acpi_psd_package *match_pdomain; 643 644 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 645 return -ENOMEM; 646 647 mutex_lock(&performance_mutex); 648 649 /* 650 * Check if another driver has already registered, and abort before 651 * changing pr->performance if it has. Check input data as well. 652 */ 653 for_each_possible_cpu(i) { 654 pr = per_cpu(processors, i); 655 if (!pr) { 656 /* Look only at processors in ACPI namespace */ 657 continue; 658 } 659 660 if (pr->performance) { 661 retval = -EBUSY; 662 goto err_out; 663 } 664 665 if (!performance || !per_cpu_ptr(performance, i)) { 666 retval = -EINVAL; 667 goto err_out; 668 } 669 } 670 671 /* Call _PSD for all CPUs */ 672 for_each_possible_cpu(i) { 673 pr = per_cpu(processors, i); 674 if (!pr) 675 continue; 676 677 pr->performance = per_cpu_ptr(performance, i); 678 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 679 if (acpi_processor_get_psd(pr)) { 680 retval = -EINVAL; 681 continue; 682 } 683 } 684 if (retval) 685 goto err_ret; 686 687 /* 688 * Now that we have _PSD data from all CPUs, lets setup P-state 689 * domain info. 690 */ 691 for_each_possible_cpu(i) { 692 pr = per_cpu(processors, i); 693 if (!pr) 694 continue; 695 696 if (cpumask_test_cpu(i, covered_cpus)) 697 continue; 698 699 pdomain = &(pr->performance->domain_info); 700 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 701 cpumask_set_cpu(i, covered_cpus); 702 if (pdomain->num_processors <= 1) 703 continue; 704 705 /* Validate the Domain info */ 706 count_target = pdomain->num_processors; 707 count = 1; 708 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 709 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 710 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 711 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 712 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 713 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 714 715 for_each_possible_cpu(j) { 716 if (i == j) 717 continue; 718 719 match_pr = per_cpu(processors, j); 720 if (!match_pr) 721 continue; 722 723 match_pdomain = &(match_pr->performance->domain_info); 724 if (match_pdomain->domain != pdomain->domain) 725 continue; 726 727 /* Here i and j are in the same domain */ 728 729 if (match_pdomain->num_processors != count_target) { 730 retval = -EINVAL; 731 goto err_ret; 732 } 733 734 if (pdomain->coord_type != match_pdomain->coord_type) { 735 retval = -EINVAL; 736 goto err_ret; 737 } 738 739 cpumask_set_cpu(j, covered_cpus); 740 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 741 count++; 742 } 743 744 for_each_possible_cpu(j) { 745 if (i == j) 746 continue; 747 748 match_pr = per_cpu(processors, j); 749 if (!match_pr) 750 continue; 751 752 match_pdomain = &(match_pr->performance->domain_info); 753 if (match_pdomain->domain != pdomain->domain) 754 continue; 755 756 match_pr->performance->shared_type = 757 pr->performance->shared_type; 758 cpumask_copy(match_pr->performance->shared_cpu_map, 759 pr->performance->shared_cpu_map); 760 } 761 } 762 763 err_ret: 764 for_each_possible_cpu(i) { 765 pr = per_cpu(processors, i); 766 if (!pr || !pr->performance) 767 continue; 768 769 /* Assume no coordination on any error parsing domain info */ 770 if (retval) { 771 cpumask_clear(pr->performance->shared_cpu_map); 772 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 773 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 774 } 775 pr->performance = NULL; /* Will be set for real in register */ 776 } 777 778 err_out: 779 mutex_unlock(&performance_mutex); 780 free_cpumask_var(covered_cpus); 781 return retval; 782 } 783 EXPORT_SYMBOL(acpi_processor_preregister_performance); 784 785 int 786 acpi_processor_register_performance(struct acpi_processor_performance 787 *performance, unsigned int cpu) 788 { 789 struct acpi_processor *pr; 790 791 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 792 return -EINVAL; 793 794 mutex_lock(&performance_mutex); 795 796 pr = per_cpu(processors, cpu); 797 if (!pr) { 798 mutex_unlock(&performance_mutex); 799 return -ENODEV; 800 } 801 802 if (pr->performance) { 803 mutex_unlock(&performance_mutex); 804 return -EBUSY; 805 } 806 807 WARN_ON(!performance); 808 809 pr->performance = performance; 810 811 if (acpi_processor_get_performance_info(pr)) { 812 pr->performance = NULL; 813 mutex_unlock(&performance_mutex); 814 return -EIO; 815 } 816 817 mutex_unlock(&performance_mutex); 818 return 0; 819 } 820 821 EXPORT_SYMBOL(acpi_processor_register_performance); 822 823 void 824 acpi_processor_unregister_performance(struct acpi_processor_performance 825 *performance, unsigned int cpu) 826 { 827 struct acpi_processor *pr; 828 829 mutex_lock(&performance_mutex); 830 831 pr = per_cpu(processors, cpu); 832 if (!pr) { 833 mutex_unlock(&performance_mutex); 834 return; 835 } 836 837 if (pr->performance) 838 kfree(pr->performance->states); 839 pr->performance = NULL; 840 841 mutex_unlock(&performance_mutex); 842 843 return; 844 } 845 846 EXPORT_SYMBOL(acpi_processor_unregister_performance); 847