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 /* 344 * MSR C001_0064+: 345 * Bit 63: PstateEn. Read-write. If set, the P-state is valid. 346 */ 347 if (!(hi & BIT(31))) 348 return; 349 350 fid = lo & 0x3f; 351 did = (lo >> 6) & 7; 352 if (boot_cpu_data.x86 == 0x10) 353 px->core_frequency = (100 * (fid + 0x10)) >> did; 354 else 355 px->core_frequency = (100 * (fid + 8)) >> did; 356 } 357 } 358 #else 359 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; 360 #endif 361 362 static int acpi_processor_get_performance_states(struct acpi_processor *pr) 363 { 364 int result = 0; 365 acpi_status status = AE_OK; 366 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 367 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; 368 struct acpi_buffer state = { 0, NULL }; 369 union acpi_object *pss = NULL; 370 int i; 371 int last_invalid = -1; 372 373 374 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); 375 if (ACPI_FAILURE(status)) { 376 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); 377 return -ENODEV; 378 } 379 380 pss = buffer.pointer; 381 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { 382 printk(KERN_ERR PREFIX "Invalid _PSS data\n"); 383 result = -EFAULT; 384 goto end; 385 } 386 387 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", 388 pss->package.count)); 389 390 pr->performance->state_count = pss->package.count; 391 pr->performance->states = 392 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 393 GFP_KERNEL); 394 if (!pr->performance->states) { 395 result = -ENOMEM; 396 goto end; 397 } 398 399 for (i = 0; i < pr->performance->state_count; i++) { 400 401 struct acpi_processor_px *px = &(pr->performance->states[i]); 402 403 state.length = sizeof(struct acpi_processor_px); 404 state.pointer = px; 405 406 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); 407 408 status = acpi_extract_package(&(pss->package.elements[i]), 409 &format, &state); 410 if (ACPI_FAILURE(status)) { 411 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); 412 result = -EFAULT; 413 kfree(pr->performance->states); 414 goto end; 415 } 416 417 amd_fixup_frequency(px, i); 418 419 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 420 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", 421 i, 422 (u32) px->core_frequency, 423 (u32) px->power, 424 (u32) px->transition_latency, 425 (u32) px->bus_master_latency, 426 (u32) px->control, (u32) px->status)); 427 428 /* 429 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq 430 */ 431 if (!px->core_frequency || 432 ((u32)(px->core_frequency * 1000) != 433 (px->core_frequency * 1000))) { 434 printk(KERN_ERR FW_BUG PREFIX 435 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", 436 pr->id, px->core_frequency); 437 if (last_invalid == -1) 438 last_invalid = i; 439 } else { 440 if (last_invalid != -1) { 441 /* 442 * Copy this valid entry over last_invalid entry 443 */ 444 memcpy(&(pr->performance->states[last_invalid]), 445 px, sizeof(struct acpi_processor_px)); 446 ++last_invalid; 447 } 448 } 449 } 450 451 if (last_invalid == 0) { 452 printk(KERN_ERR FW_BUG PREFIX 453 "No valid BIOS _PSS frequency found for processor %d\n", pr->id); 454 result = -EFAULT; 455 kfree(pr->performance->states); 456 pr->performance->states = NULL; 457 } 458 459 if (last_invalid > 0) 460 pr->performance->state_count = last_invalid; 461 462 end: 463 kfree(buffer.pointer); 464 465 return result; 466 } 467 468 int acpi_processor_get_performance_info(struct acpi_processor *pr) 469 { 470 int result = 0; 471 acpi_status status = AE_OK; 472 acpi_handle handle = NULL; 473 474 if (!pr || !pr->performance || !pr->handle) 475 return -EINVAL; 476 477 status = acpi_get_handle(pr->handle, "_PCT", &handle); 478 if (ACPI_FAILURE(status)) { 479 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 480 "ACPI-based processor performance control unavailable\n")); 481 return -ENODEV; 482 } 483 484 result = acpi_processor_get_performance_control(pr); 485 if (result) 486 goto update_bios; 487 488 result = acpi_processor_get_performance_states(pr); 489 if (result) 490 goto update_bios; 491 492 /* We need to call _PPC once when cpufreq starts */ 493 if (ignore_ppc != 1) 494 result = acpi_processor_get_platform_limit(pr); 495 496 return result; 497 498 /* 499 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that 500 * the BIOS is older than the CPU and does not know its frequencies 501 */ 502 update_bios: 503 #ifdef CONFIG_X86 504 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){ 505 if(boot_cpu_has(X86_FEATURE_EST)) 506 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " 507 "frequency support\n"); 508 } 509 #endif 510 return result; 511 } 512 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); 513 int acpi_processor_notify_smm(struct module *calling_module) 514 { 515 acpi_status status; 516 static int is_done = 0; 517 518 519 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 520 return -EBUSY; 521 522 if (!try_module_get(calling_module)) 523 return -EINVAL; 524 525 /* is_done is set to negative if an error occurred, 526 * and to postitive if _no_ error occurred, but SMM 527 * was already notified. This avoids double notification 528 * which might lead to unexpected results... 529 */ 530 if (is_done > 0) { 531 module_put(calling_module); 532 return 0; 533 } else if (is_done < 0) { 534 module_put(calling_module); 535 return is_done; 536 } 537 538 is_done = -EIO; 539 540 /* Can't write pstate_control to smi_command if either value is zero */ 541 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { 542 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); 543 module_put(calling_module); 544 return 0; 545 } 546 547 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 548 "Writing pstate_control [0x%x] to smi_command [0x%x]\n", 549 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 550 551 status = acpi_os_write_port(acpi_gbl_FADT.smi_command, 552 (u32) acpi_gbl_FADT.pstate_control, 8); 553 if (ACPI_FAILURE(status)) { 554 ACPI_EXCEPTION((AE_INFO, status, 555 "Failed to write pstate_control [0x%x] to " 556 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, 557 acpi_gbl_FADT.smi_command)); 558 module_put(calling_module); 559 return status; 560 } 561 562 /* Success. If there's no _PPC, we need to fear nothing, so 563 * we can allow the cpufreq driver to be rmmod'ed. */ 564 is_done = 1; 565 566 if (!(acpi_processor_ppc_status & PPC_IN_USE)) 567 module_put(calling_module); 568 569 return 0; 570 } 571 572 EXPORT_SYMBOL(acpi_processor_notify_smm); 573 574 static int acpi_processor_get_psd(struct acpi_processor *pr) 575 { 576 int result = 0; 577 acpi_status status = AE_OK; 578 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 579 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; 580 struct acpi_buffer state = {0, NULL}; 581 union acpi_object *psd = NULL; 582 struct acpi_psd_package *pdomain; 583 584 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); 585 if (ACPI_FAILURE(status)) { 586 return -ENODEV; 587 } 588 589 psd = buffer.pointer; 590 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { 591 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 592 result = -EFAULT; 593 goto end; 594 } 595 596 if (psd->package.count != 1) { 597 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 598 result = -EFAULT; 599 goto end; 600 } 601 602 pdomain = &(pr->performance->domain_info); 603 604 state.length = sizeof(struct acpi_psd_package); 605 state.pointer = pdomain; 606 607 status = acpi_extract_package(&(psd->package.elements[0]), 608 &format, &state); 609 if (ACPI_FAILURE(status)) { 610 printk(KERN_ERR PREFIX "Invalid _PSD data\n"); 611 result = -EFAULT; 612 goto end; 613 } 614 615 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { 616 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); 617 result = -EFAULT; 618 goto end; 619 } 620 621 if (pdomain->revision != ACPI_PSD_REV0_REVISION) { 622 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); 623 result = -EFAULT; 624 goto end; 625 } 626 627 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && 628 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && 629 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { 630 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); 631 result = -EFAULT; 632 goto end; 633 } 634 end: 635 kfree(buffer.pointer); 636 return result; 637 } 638 639 int acpi_processor_preregister_performance( 640 struct acpi_processor_performance __percpu *performance) 641 { 642 int count_target; 643 int retval = 0; 644 unsigned int i, j; 645 cpumask_var_t covered_cpus; 646 struct acpi_processor *pr; 647 struct acpi_psd_package *pdomain; 648 struct acpi_processor *match_pr; 649 struct acpi_psd_package *match_pdomain; 650 651 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) 652 return -ENOMEM; 653 654 mutex_lock(&performance_mutex); 655 656 /* 657 * Check if another driver has already registered, and abort before 658 * changing pr->performance if it has. Check input data as well. 659 */ 660 for_each_possible_cpu(i) { 661 pr = per_cpu(processors, i); 662 if (!pr) { 663 /* Look only at processors in ACPI namespace */ 664 continue; 665 } 666 667 if (pr->performance) { 668 retval = -EBUSY; 669 goto err_out; 670 } 671 672 if (!performance || !per_cpu_ptr(performance, i)) { 673 retval = -EINVAL; 674 goto err_out; 675 } 676 } 677 678 /* Call _PSD for all CPUs */ 679 for_each_possible_cpu(i) { 680 pr = per_cpu(processors, i); 681 if (!pr) 682 continue; 683 684 pr->performance = per_cpu_ptr(performance, i); 685 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 686 if (acpi_processor_get_psd(pr)) { 687 retval = -EINVAL; 688 continue; 689 } 690 } 691 if (retval) 692 goto err_ret; 693 694 /* 695 * Now that we have _PSD data from all CPUs, lets setup P-state 696 * domain info. 697 */ 698 for_each_possible_cpu(i) { 699 pr = per_cpu(processors, i); 700 if (!pr) 701 continue; 702 703 if (cpumask_test_cpu(i, covered_cpus)) 704 continue; 705 706 pdomain = &(pr->performance->domain_info); 707 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 708 cpumask_set_cpu(i, covered_cpus); 709 if (pdomain->num_processors <= 1) 710 continue; 711 712 /* Validate the Domain info */ 713 count_target = pdomain->num_processors; 714 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) 715 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 716 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) 717 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; 718 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) 719 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; 720 721 for_each_possible_cpu(j) { 722 if (i == j) 723 continue; 724 725 match_pr = per_cpu(processors, j); 726 if (!match_pr) 727 continue; 728 729 match_pdomain = &(match_pr->performance->domain_info); 730 if (match_pdomain->domain != pdomain->domain) 731 continue; 732 733 /* Here i and j are in the same domain */ 734 735 if (match_pdomain->num_processors != count_target) { 736 retval = -EINVAL; 737 goto err_ret; 738 } 739 740 if (pdomain->coord_type != match_pdomain->coord_type) { 741 retval = -EINVAL; 742 goto err_ret; 743 } 744 745 cpumask_set_cpu(j, covered_cpus); 746 cpumask_set_cpu(j, pr->performance->shared_cpu_map); 747 } 748 749 for_each_possible_cpu(j) { 750 if (i == j) 751 continue; 752 753 match_pr = per_cpu(processors, j); 754 if (!match_pr) 755 continue; 756 757 match_pdomain = &(match_pr->performance->domain_info); 758 if (match_pdomain->domain != pdomain->domain) 759 continue; 760 761 match_pr->performance->shared_type = 762 pr->performance->shared_type; 763 cpumask_copy(match_pr->performance->shared_cpu_map, 764 pr->performance->shared_cpu_map); 765 } 766 } 767 768 err_ret: 769 for_each_possible_cpu(i) { 770 pr = per_cpu(processors, i); 771 if (!pr || !pr->performance) 772 continue; 773 774 /* Assume no coordination on any error parsing domain info */ 775 if (retval) { 776 cpumask_clear(pr->performance->shared_cpu_map); 777 cpumask_set_cpu(i, pr->performance->shared_cpu_map); 778 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; 779 } 780 pr->performance = NULL; /* Will be set for real in register */ 781 } 782 783 err_out: 784 mutex_unlock(&performance_mutex); 785 free_cpumask_var(covered_cpus); 786 return retval; 787 } 788 EXPORT_SYMBOL(acpi_processor_preregister_performance); 789 790 int 791 acpi_processor_register_performance(struct acpi_processor_performance 792 *performance, unsigned int cpu) 793 { 794 struct acpi_processor *pr; 795 796 if (!(acpi_processor_ppc_status & PPC_REGISTERED)) 797 return -EINVAL; 798 799 mutex_lock(&performance_mutex); 800 801 pr = per_cpu(processors, cpu); 802 if (!pr) { 803 mutex_unlock(&performance_mutex); 804 return -ENODEV; 805 } 806 807 if (pr->performance) { 808 mutex_unlock(&performance_mutex); 809 return -EBUSY; 810 } 811 812 WARN_ON(!performance); 813 814 pr->performance = performance; 815 816 if (acpi_processor_get_performance_info(pr)) { 817 pr->performance = NULL; 818 mutex_unlock(&performance_mutex); 819 return -EIO; 820 } 821 822 mutex_unlock(&performance_mutex); 823 return 0; 824 } 825 826 EXPORT_SYMBOL(acpi_processor_register_performance); 827 828 void 829 acpi_processor_unregister_performance(struct acpi_processor_performance 830 *performance, unsigned int cpu) 831 { 832 struct acpi_processor *pr; 833 834 mutex_lock(&performance_mutex); 835 836 pr = per_cpu(processors, cpu); 837 if (!pr) { 838 mutex_unlock(&performance_mutex); 839 return; 840 } 841 842 if (pr->performance) 843 kfree(pr->performance->states); 844 pr->performance = NULL; 845 846 mutex_unlock(&performance_mutex); 847 848 return; 849 } 850 851 EXPORT_SYMBOL(acpi_processor_unregister_performance); 852