drivers/acpi/processor_perflib.c

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