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 /* 239 * Do a quick check if the systems looks like it should use ACPI 240 * cpufreq. We look at a _PCT method being available, but don't 241 * do a whole lot of sanity checks. 242 */ 243 void acpi_processor_load_module(struct acpi_processor *pr) 244 { 245 static int requested; 246 acpi_status status = 0; 247 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 248 249 if (!arch_has_acpi_pdc() || requested) 250 return; 251 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 252 if (!ACPI_FAILURE(status)) { 253 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n"); 254 request_module_nowait("acpi_cpufreq"); 255 requested = 1; 256 } 257 kfree(buffer.pointer); 258 } 259 260 static int acpi_processor_get_performance_control(struct acpi_processor *pr) 261 { 262 int result = 0; 263 acpi_status status = 0; 264 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 265 union acpi_object *pct = NULL; 266 union acpi_object obj = { 0 }; 267 268 269 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); 270 if (ACPI_FAILURE(status)) { 271 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); 272 return -ENODEV; 273 } 274 275 pct = (union acpi_object *)buffer.pointer; 276 if (!pct || (pct->type != ACPI_TYPE_PACKAGE) 277 || (pct->package.count != 2)) { 278 printk(KERN_ERR PREFIX "Invalid _PCT data\n"); 279 result = -EFAULT; 280 goto end; 281 } 282 283 /* 284 * control_register 285 */ 286 287 obj = pct->package.elements[0]; 288 289 if ((obj.type != ACPI_TYPE_BUFFER) 290 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 291 || (obj.buffer.pointer == NULL)) { 292 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); 293 result = -EFAULT; 294 goto end; 295 } 296 memcpy(&pr->performance->control_register, obj.buffer.pointer, 297 sizeof(struct acpi_pct_register)); 298 299 /* 300 * status_register 301 */ 302 303 obj = pct->package.elements[1]; 304 305 if ((obj.type != ACPI_TYPE_BUFFER) 306 || (obj.buffer.length < sizeof(struct acpi_pct_register)) 307 || (obj.buffer.pointer == NULL)) { 308 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); 309 result = -EFAULT; 310 goto end; 311 } 312 313 memcpy(&pr->performance->status_register, obj.buffer.pointer, 314 sizeof(struct acpi_pct_register)); 315 316 end: 317 kfree(buffer.pointer); 318 319 return result; 320 } 321 322 #ifdef CONFIG_X86 323 /* 324 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding 325 * in their ACPI data. Calculate the real values and fix up the _PSS data. 326 */ 327 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) 328 { 329 u32 hi, lo, fid, did; 330 int index = px->control & 0x00000007; 331 332 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) 333 return; 334 335 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) 336 || boot_cpu_data.x86 == 0x11) { 337 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); 338 /* 339 * MSR C001_0064+: 340 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 341 */ 342 if (!(hi & BIT(31))) 343 return; 344 345 fid = lo & 0x3f; 346 did = (lo >> 6) & 7; 347 if (boot_cpu_data.x86 == 0x10) 348 px->core_frequency = (100 * (fid + 0x10)) >> did; 349 else 350 px->core_frequency = (100 * (fid + 8)) >> did; 351 } 352 } 353 #else 354 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 355 #endif 356 357 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 358 { 359 int result = 0; 360 acpi_status status = AE_OK; 361 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 362 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 363 struct acpi_buffer state = { 0, NULL }; 364 union acpi_object *pss = NULL; 365 int i; 366 int last_invalid = -1; 367 368 369 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 370 if (ACPI_FAILURE(status)) { 371 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 372 return -ENODEV; 373 } 374 375 pss = buffer.pointer; 376 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 377 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 378 result = -EFAULT; 379 goto end; 380 } 381 382 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 383 pss->package.count)); 384 385 pr->performance->state_count = pss->package.count; 386 pr->performance->states = 387 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 388 GFP_KERNEL); 389 if (!pr->performance->states) { 390 result = -ENOMEM; 391 goto end; 392 } 393 394 for (i = 0; i < pr->performance->state_count; i++) { 395 396 struct acpi_processor_px *px = &(pr->performance->states[i]); 397 398 state.length = sizeof(struct acpi_processor_px); 399 state.pointer = px; 400 401 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 402 403 status = acpi_extract_package(&(pss->package.elements[i]), 404 &format, &state); 405 if (ACPI_FAILURE(status)) { 406 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 407 result = -EFAULT; 408 kfree(pr->performance->states); 409 goto end; 410 } 411 412 amd_fixup_frequency(px, i); 413 414 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 415 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 416 i, 417 (u32) px->core_frequency, 418 (u32) px->power, 419 (u32) px->transition_latency, 420 (u32) px->bus_master_latency, 421 (u32) px->control, (u32) px->status)); 422 423 /* 424 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 425 */ 426 if (!px->core_frequency || 427 ((u32)(px->core_frequency * 1000) != 428 (px->core_frequency * 1000))) { 429 printk(KERN_ERR FW_BUG PREFIX 430 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 431 pr->id, px->core_frequency); 432 if (last_invalid == -1) 433 last_invalid = i; 434 } else { 435 if (last_invalid != -1) { 436 /* 437 * Copy this valid entry over last_invalid entry 438 */ 439 memcpy(&(pr->performance->states[last_invalid]), 440 px, sizeof(struct acpi_processor_px)); 441 ++last_invalid; 442 } 443 } 444 } 445 446 if (last_invalid == 0) { 447 printk(KERN_ERR FW_BUG PREFIX 448 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 449 result = -EFAULT; 450 kfree(pr->performance->states); 451 pr->performance->states = NULL; 452 } 453 454 if (last_invalid > 0) 455 pr->performance->state_count = last_invalid; 456 457 end: 458 kfree(buffer.pointer); 459 460 return result; 461 } 462 463 int acpi_processor_get_performance_info(struct acpi_processor *pr) 464 { 465 int result = 0; 466 467 if (!pr || !pr->performance || !pr->handle) 468 return -EINVAL; 469 470 if (!acpi_has_method(pr->handle, "_PCT")) { 471 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 472 "ACPI-based processor performance control unavailable\n")); 473 return -ENODEV; 474 } 475 476 result = acpi_processor_get_performance_control(pr); 477 if (result) 478 goto update_bios; 479 480 result = acpi_processor_get_performance_states(pr); 481 if (result) 482 goto update_bios; 483 484 /* We need to call _PPC once when cpufreq starts */ 485 if (ignore_ppc != 1) 486 result = acpi_processor_get_platform_limit(pr); 487 488 return result; 489 490 /* 491 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 492 * the BIOS is older than the CPU and does not know its frequencies 493 */ 494 update_bios: 495 #ifdef CONFIG_X86 496 if (acpi_has_method(pr->handle, "_PPC")) { 497 if(boot_cpu_has(X86_FEATURE_EST)) 498 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 499 "frequency support\n"); 500 } 501 #endif 502 return result; 503 } 504 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 505 int acpi_processor_notify_smm(struct module *calling_module) 506 { 507 acpi_status status; 508 static int is_done = 0; 509 510 511 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 512 return -EBUSY; 513 514 if (!try_module_get(calling_module)) 515 return -EINVAL; 516 517 /* is_done is set to negative if an error occurred, 518 * and to postitive if _no_ error occurred, but SMM 519 * was already notified. This avoids double notification 520 * which might lead to unexpected results... 521 */ 522 if (is_done > 0) { 523 module_put(calling_module); 524 return 0; 525 } else if (is_done < 0) { 526 module_put(calling_module); 527 return is_done; 528 } 529 530 is_done = -EIO; 531 532 /* Can't write pstate_control to smi_command if either value is zero */ 533 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { 534 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 535 module_put(calling_module); 536 return 0; 537 } 538 539 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 540 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 541 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 542 543 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 544 (u32) acpi_gbl_FADT.pstate_control, 8); 545 if (ACPI_FAILURE(status)) { 546 ACPI_EXCEPTION((AE_INFO, status, 547 "Failed to write pstate_control [0x%x] to " 548 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, 549 acpi_gbl_FADT.smi_command)); 550 module_put(calling_module); 551 return status; 552 } 553 554 /* Success. If there's no _PPC, we need to fear nothing, so 555 * we can allow the cpufreq driver to be rmmod'ed. */ 556 is_done = 1; 557 558 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 559 module_put(calling_module); 560 561 return 0; 562 } 563 564 EXPORT_SYMBOL(acpi_processor_notify_smm); 565 566 static int acpi_processor_get_psd(struct acpi_processor *pr) 567 { 568 int result = 0; 569 acpi_status status = AE_OK; 570 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 571 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 572 struct acpi_buffer state = {0, NULL}; 573 union acpi_object *psd = NULL; 574 struct acpi_psd_package *pdomain; 575 576 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 577 if (ACPI_FAILURE(status)) { 578 return -ENODEV; 579 } 580 581 psd = buffer.pointer; 582 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 583 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 584 result = -EFAULT; 585 goto end; 586 } 587 588 if (psd->package.count != 1) { 589 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 590 result = -EFAULT; 591 goto end; 592 } 593 594 pdomain = &(pr->performance->domain_info); 595 596 state.length = sizeof(struct acpi_psd_package); 597 state.pointer = pdomain; 598 599 status = acpi_extract_package(&(psd->package.elements[0]), 600 &format, &state); 601 if (ACPI_FAILURE(status)) { 602 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 603 result = -EFAULT; 604 goto end; 605 } 606 607 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 608 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 609 result = -EFAULT; 610 goto end; 611 } 612 613 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 614 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 615 result = -EFAULT; 616 goto end; 617 } 618 619 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 620 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 621 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 622 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 623 result = -EFAULT; 624 goto end; 625 } 626 end: 627 kfree(buffer.pointer); 628 return result; 629 } 630 631 int acpi_processor_preregister_performance( 632 struct acpi_processor_performance __percpu *performance) 633 { 634 int count_target; 635 int retval = 0; 636 unsigned int i, j; 637 cpumask_var_t covered_cpus; 638 struct acpi_processor *pr; 639 struct acpi_psd_package *pdomain; 640 struct acpi_processor *match_pr; 641 struct acpi_psd_package *match_pdomain; 642 643 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 644 return -ENOMEM; 645 646 mutex_lock(&performance_mutex); 647 648 /* 649 * Check if another driver has already registered, and abort before 650 * changing pr->performance if it has. Check input data as well. 651 */ 652 for_each_possible_cpu(i) { 653 pr = per_cpu(processors, i); 654 if (!pr) { 655 /* Look only at processors in ACPI namespace */ 656 continue; 657 } 658 659 if (pr->performance) { 660 retval = -EBUSY; 661 goto err_out; 662 } 663 664 if (!performance || !per_cpu_ptr(performance, i)) { 665 retval = -EINVAL; 666 goto err_out; 667 } 668 } 669 670 /* Call _PSD for all CPUs */ 671 for_each_possible_cpu(i) { 672 pr = per_cpu(processors, i); 673 if (!pr) 674 continue; 675 676 pr->performance = per_cpu_ptr(performance, i); 677 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 678 if (acpi_processor_get_psd(pr)) { 679 retval = -EINVAL; 680 continue; 681 } 682 } 683 if (retval) 684 goto err_ret; 685 686 /* 687 * Now that we have _PSD data from all CPUs, lets setup P-state 688 * domain info. 689 */ 690 for_each_possible_cpu(i) { 691 pr = per_cpu(processors, i); 692 if (!pr) 693 continue; 694 695 if (cpumask_test_cpu(i, covered_cpus)) 696 continue; 697 698 pdomain = &(pr->performance->domain_info); 699 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 700 cpumask_set_cpu(i, covered_cpus); 701 if (pdomain->num_processors <= 1) 702 continue; 703 704 /* Validate the Domain info */ 705 count_target = pdomain->num_processors; 706 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 707 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 708 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 709 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 710 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 711 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 712 713 for_each_possible_cpu(j) { 714 if (i == j) 715 continue; 716 717 match_pr = per_cpu(processors, j); 718 if (!match_pr) 719 continue; 720 721 match_pdomain = &(match_pr->performance->domain_info); 722 if (match_pdomain->domain != pdomain->domain) 723 continue; 724 725 /* Here i and j are in the same domain */ 726 727 if (match_pdomain->num_processors != count_target) { 728 retval = -EINVAL; 729 goto err_ret; 730 } 731 732 if (pdomain->coord_type != match_pdomain->coord_type) { 733 retval = -EINVAL; 734 goto err_ret; 735 } 736 737 cpumask_set_cpu(j, covered_cpus); 738 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 739 } 740 741 for_each_possible_cpu(j) { 742 if (i == j) 743 continue; 744 745 match_pr = per_cpu(processors, j); 746 if (!match_pr) 747 continue; 748 749 match_pdomain = &(match_pr->performance->domain_info); 750 if (match_pdomain->domain != pdomain->domain) 751 continue; 752 753 match_pr->performance->shared_type = 754 pr->performance->shared_type; 755 cpumask_copy(match_pr->performance->shared_cpu_map, 756 pr->performance->shared_cpu_map); 757 } 758 } 759 760 err_ret: 761 for_each_possible_cpu(i) { 762 pr = per_cpu(processors, i); 763 if (!pr || !pr->performance) 764 continue; 765 766 /* Assume no coordination on any error parsing domain info */ 767 if (retval) { 768 cpumask_clear(pr->performance->shared_cpu_map); 769 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 770 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 771 } 772 pr->performance = NULL; /* Will be set for real in register */ 773 } 774 775 err_out: 776 mutex_unlock(&performance_mutex); 777 free_cpumask_var(covered_cpus); 778 return retval; 779 } 780 EXPORT_SYMBOL(acpi_processor_preregister_performance); 781 782 int 783 acpi_processor_register_performance(struct acpi_processor_performance 784 *performance, unsigned int cpu) 785 { 786 struct acpi_processor *pr; 787 788 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 789 return -EINVAL; 790 791 mutex_lock(&performance_mutex); 792 793 pr = per_cpu(processors, cpu); 794 if (!pr) { 795 mutex_unlock(&performance_mutex); 796 return -ENODEV; 797 } 798 799 if (pr->performance) { 800 mutex_unlock(&performance_mutex); 801 return -EBUSY; 802 } 803 804 WARN_ON(!performance); 805 806 pr->performance = performance; 807 808 if (acpi_processor_get_performance_info(pr)) { 809 pr->performance = NULL; 810 mutex_unlock(&performance_mutex); 811 return -EIO; 812 } 813 814 mutex_unlock(&performance_mutex); 815 return 0; 816 } 817 818 EXPORT_SYMBOL(acpi_processor_register_performance); 819 820 void 821 acpi_processor_unregister_performance(struct acpi_processor_performance 822 *performance, unsigned int cpu) 823 { 824 struct acpi_processor *pr; 825 826 mutex_lock(&performance_mutex); 827 828 pr = per_cpu(processors, cpu); 829 if (!pr) { 830 mutex_unlock(&performance_mutex); 831 return; 832 } 833 834 if (pr->performance) 835 kfree(pr->performance->states); 836 pr->performance = NULL; 837 838 mutex_unlock(&performance_mutex); 839 840 return; 841 } 842 843 EXPORT_SYMBOL(acpi_processor_unregister_performance); 844