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
  34 #ifdef CONFIG_X86
  35 #include <asm/cpufeature.h>
  36 #endif
  37
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40 #include <acpi/processor.h>
  41
  42 #define PREFIX "ACPI: "
  43
  44 #define ACPI_PROCESSOR_CLASS            "processor"
  45 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  46 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  47 ACPI_MODULE_NAME("processor_perflib");
  48
  49 static DEFINE_MUTEX(performance_mutex);
  50
  51 /* Use cpufreq debug layer for _PPC changes. */
  52 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
  53                                                 "cpufreq-core", msg)
  54
  55 /*
  56  * _PPC support is implemented as a CPUfreq policy notifier:
  57  * This means each time a CPUfreq driver registered also with
  58  * the ACPI core is asked to change the speed policy, the maximum
  59  * value is adjusted so that it is within the platform limit.
  60  *
  61  * Also, when a new platform limit value is detected, the CPUfreq
  62  * policy is adjusted accordingly.
  63  */
  64
  65 /* ignore_ppc:
  66  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  67  *       ignore _PPC
  68  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  69  *  1 -> ignore _PPC totally -> forced by user through boot param
  70  */
  71 static int ignore_ppc = -1;
  72 module_param(ignore_ppc, int, 0644);
  73 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  74                  "limited by BIOS, this should help");
  75
  76 #define PPC_REGISTERED   1
  77 #define PPC_IN_USE       2
  78
  79 static int acpi_processor_ppc_status;
  80
  81 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  82                                        unsigned long event, void *data)
  83 {
  84         struct cpufreq_policy *policy = data;
  85         struct acpi_processor *pr;
  86         unsigned int ppc = 0;
  87
  88         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  89                 ignore_ppc = 0;
  90                 return 0;
  91         }
  92
  93         if (ignore_ppc)
  94                 return 0;
  95
  96         if (event != CPUFREQ_INCOMPATIBLE)
  97                 return 0;
  98
  99         mutex_lock(&performance_mutex);
 100
 101         pr = per_cpu(processors, policy->cpu);
 102         if (!pr || !pr->performance)
 103                 goto out;
 104
 105         ppc = (unsigned int)pr->performance_platform_limit;
 106
 107         if (ppc >= pr->performance->state_count)
 108                 goto out;
 109
 110         cpufreq_verify_within_limits(policy, 0,
 111                                      pr->performance->states[ppc].
 112                                      core_frequency * 1000);
 113
 114       out:
 115         mutex_unlock(&performance_mutex);
 116
 117         return 0;
 118 }
 119
 120 static struct notifier_block acpi_ppc_notifier_block = {
 121         .notifier_call = acpi_processor_ppc_notifier,
 122 };
 123
 124 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 125 {
 126         acpi_status status = 0;
 127         unsigned long long ppc = 0;
 128
 129
 130         if (!pr)
 131                 return -EINVAL;
 132
 133         /*
 134          * _PPC indicates the maximum state currently supported by the platform
 135          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 136          */
 137         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 138
 139         if (status != AE_NOT_FOUND)
 140                 acpi_processor_ppc_status |= PPC_IN_USE;
 141
 142         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 143                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 144                 return -ENODEV;
 145         }
 146
 147         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 148                        (int)ppc, ppc ? "" : "not");
 149
 150         pr->performance_platform_limit = (int)ppc;
 151
 152         return 0;
 153 }
 154
 155 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 156 /*
 157  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 158  * @handle: ACPI processor handle
 159  * @status: the status code of _PPC evaluation
 160  *      0: success. OSPM is now using the performance state specificed.
 161  *      1: failure. OSPM has not changed the number of P-states in use
 162  */
 163 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 164 {
 165         union acpi_object params[2] = {
 166                 {.type = ACPI_TYPE_INTEGER,},
 167                 {.type = ACPI_TYPE_INTEGER,},
 168         };
 169         struct acpi_object_list arg_list = {2, params};
 170         acpi_handle temp;
 171
 172         params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 173         params[1].integer.value =  status;
 174
 175         /* when there is no _OST , skip it */
 176         if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
 177                 return;
 178
 179         acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 180         return;
 181 }
 182
 183 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 184 {
 185         int ret;
 186
 187         if (ignore_ppc) {
 188                 /*
 189                  * Only when it is notification event, the _OST object
 190                  * will be evaluated. Otherwise it is skipped.
 191                  */
 192                 if (event_flag)
 193                         acpi_processor_ppc_ost(pr->handle, 1);
 194                 return 0;
 195         }
 196
 197         ret = acpi_processor_get_platform_limit(pr);
 198         /*
 199          * Only when it is notification event, the _OST object
 200          * will be evaluated. Otherwise it is skipped.
 201          */
 202         if (event_flag) {
 203                 if (ret < 0)
 204                         acpi_processor_ppc_ost(pr->handle, 1);
 205                 else
 206                         acpi_processor_ppc_ost(pr->handle, 0);
 207         }
 208         if (ret < 0)
 209                 return (ret);
 210         else
 211                 return cpufreq_update_policy(pr->id);
 212 }
 213
 214 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 215 {
 216         struct acpi_processor *pr;
 217
 218         pr = per_cpu(processors, cpu);
 219         if (!pr || !pr->performance || !pr->performance->state_count)
 220                 return -ENODEV;
 221         *limit = pr->performance->states[pr->performance_platform_limit].
 222                 core_frequency * 1000;
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 226
 227 void acpi_processor_ppc_init(void)
 228 {
 229         if (!cpufreq_register_notifier
 230             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 231                 acpi_processor_ppc_status |= PPC_REGISTERED;
 232         else
 233                 printk(KERN_DEBUG
 234                        "Warning: Processor Platform Limit not supported.\n");
 235 }
 236
 237 void acpi_processor_ppc_exit(void)
 238 {
 239         if (acpi_processor_ppc_status & PPC_REGISTERED)
 240                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 241                                             CPUFREQ_POLICY_NOTIFIER);
 242
 243         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 244 }
 245
 246 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 247 {
 248         int result = 0;
 249         acpi_status status = 0;
 250         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 251         union acpi_object *pct = NULL;
 252         union acpi_object obj = { 0 };
 253
 254
 255         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 256         if (ACPI_FAILURE(status)) {
 257                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 258                 return -ENODEV;
 259         }
 260
 261         pct = (union acpi_object *)buffer.pointer;
 262         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 263             || (pct->package.count != 2)) {
 264                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 265                 result = -EFAULT;
 266                 goto end;
 267         }
 268
 269         /*
 270          * control_register
 271          */
 272
 273         obj = pct->package.elements[0];
 274
 275         if ((obj.type != ACPI_TYPE_BUFFER)
 276             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 277             || (obj.buffer.pointer == NULL)) {
 278                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 279                 result = -EFAULT;
 280                 goto end;
 281         }
 282         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 283                sizeof(struct acpi_pct_register));
 284
 285         /*
 286          * status_register
 287          */
 288
 289         obj = pct->package.elements[1];
 290
 291         if ((obj.type != ACPI_TYPE_BUFFER)
 292             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 293             || (obj.buffer.pointer == NULL)) {
 294                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 295                 result = -EFAULT;
 296                 goto end;
 297         }
 298
 299         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 300                sizeof(struct acpi_pct_register));
 301
 302       end:
 303         kfree(buffer.pointer);
 304
 305         return result;
 306 }
 307
 308 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 309 {
 310         int result = 0;
 311         acpi_status status = AE_OK;
 312         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 313         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 314         struct acpi_buffer state = { 0, NULL };
 315         union acpi_object *pss = NULL;
 316         int i;
 317
 318
 319         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 320         if (ACPI_FAILURE(status)) {
 321                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 322                 return -ENODEV;
 323         }
 324
 325         pss = buffer.pointer;
 326         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 327                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 328                 result = -EFAULT;
 329                 goto end;
 330         }
 331
 332         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 333                           pss->package.count));
 334
 335         pr->performance->state_count = pss->package.count;
 336         pr->performance->states =
 337             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 338                     GFP_KERNEL);
 339         if (!pr->performance->states) {
 340                 result = -ENOMEM;
 341                 goto end;
 342         }
 343
 344         for (i = 0; i < pr->performance->state_count; i++) {
 345
 346                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 347
 348                 state.length = sizeof(struct acpi_processor_px);
 349                 state.pointer = px;
 350
 351                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 352
 353                 status = acpi_extract_package(&(pss->package.elements[i]),
 354                                               &format, &state);
 355                 if (ACPI_FAILURE(status)) {
 356                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 357                         result = -EFAULT;
 358                         kfree(pr->performance->states);
 359                         goto end;
 360                 }
 361
 362                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 363                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 364                                   i,
 365                                   (u32) px->core_frequency,
 366                                   (u32) px->power,
 367                                   (u32) px->transition_latency,
 368                                   (u32) px->bus_master_latency,
 369                                   (u32) px->control, (u32) px->status));
 370
 371                 /*
 372                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 373                  */
 374                 if (!px->core_frequency ||
 375                     ((u32)(px->core_frequency * 1000) !=
 376                      (px->core_frequency * 1000))) {
 377                         printk(KERN_ERR FW_BUG PREFIX
 378                                "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
 379                                px->core_frequency);
 380                         result = -EFAULT;
 381                         kfree(pr->performance->states);
 382                         goto end;
 383                 }
 384         }
 385
 386       end:
 387         kfree(buffer.pointer);
 388
 389         return result;
 390 }
 391
 392 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 393 {
 394         int result = 0;
 395         acpi_status status = AE_OK;
 396         acpi_handle handle = NULL;
 397
 398         if (!pr || !pr->performance || !pr->handle)
 399                 return -EINVAL;
 400
 401         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 402         if (ACPI_FAILURE(status)) {
 403                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 404                                   "ACPI-based processor performance control unavailable\n"));
 405                 return -ENODEV;
 406         }
 407
 408         result = acpi_processor_get_performance_control(pr);
 409         if (result)
 410                 goto update_bios;
 411
 412         result = acpi_processor_get_performance_states(pr);
 413         if (result)
 414                 goto update_bios;
 415
 416         /* We need to call _PPC once when cpufreq starts */
 417         if (ignore_ppc != 1)
 418                 result = acpi_processor_get_platform_limit(pr);
 419
 420         return result;
 421
 422         /*
 423          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 424          * the BIOS is older than the CPU and does not know its frequencies
 425          */
 426  update_bios:
 427 #ifdef CONFIG_X86
 428         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 429                 if(boot_cpu_has(X86_FEATURE_EST))
 430                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 431                                "frequency support\n");
 432         }
 433 #endif
 434         return result;
 435 }
 436
 437 int acpi_processor_notify_smm(struct module *calling_module)
 438 {
 439         acpi_status status;
 440         static int is_done = 0;
 441
 442
 443         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 444                 return -EBUSY;
 445
 446         if (!try_module_get(calling_module))
 447                 return -EINVAL;
 448
 449         /* is_done is set to negative if an error occured,
 450          * and to postitive if _no_ error occured, but SMM
 451          * was already notified. This avoids double notification
 452          * which might lead to unexpected results...
 453          */
 454         if (is_done > 0) {
 455                 module_put(calling_module);
 456                 return 0;
 457         } else if (is_done < 0) {
 458                 module_put(calling_module);
 459                 return is_done;
 460         }
 461
 462         is_done = -EIO;
 463
 464         /* Can't write pstate_control to smi_command if either value is zero */
 465         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 466                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 467                 module_put(calling_module);
 468                 return 0;
 469         }
 470
 471         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 472                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 473                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 474
 475         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 476                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 477         if (ACPI_FAILURE(status)) {
 478                 ACPI_EXCEPTION((AE_INFO, status,
 479                                 "Failed to write pstate_control [0x%x] to "
 480                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 481                                 acpi_gbl_FADT.smi_command));
 482                 module_put(calling_module);
 483                 return status;
 484         }
 485
 486         /* Success. If there's no _PPC, we need to fear nothing, so
 487          * we can allow the cpufreq driver to be rmmod'ed. */
 488         is_done = 1;
 489
 490         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 491                 module_put(calling_module);
 492
 493         return 0;
 494 }
 495
 496 EXPORT_SYMBOL(acpi_processor_notify_smm);
 497
 498 static int acpi_processor_get_psd(struct acpi_processor *pr)
 499 {
 500         int result = 0;
 501         acpi_status status = AE_OK;
 502         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 503         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 504         struct acpi_buffer state = {0, NULL};
 505         union acpi_object  *psd = NULL;
 506         struct acpi_psd_package *pdomain;
 507
 508         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 509         if (ACPI_FAILURE(status)) {
 510                 return -ENODEV;
 511         }
 512
 513         psd = buffer.pointer;
 514         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 515                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 516                 result = -EFAULT;
 517                 goto end;
 518         }
 519
 520         if (psd->package.count != 1) {
 521                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 522                 result = -EFAULT;
 523                 goto end;
 524         }
 525
 526         pdomain = &(pr->performance->domain_info);
 527
 528         state.length = sizeof(struct acpi_psd_package);
 529         state.pointer = pdomain;
 530
 531         status = acpi_extract_package(&(psd->package.elements[0]),
 532                 &format, &state);
 533         if (ACPI_FAILURE(status)) {
 534                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 535                 result = -EFAULT;
 536                 goto end;
 537         }
 538
 539         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 540                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 541                 result = -EFAULT;
 542                 goto end;
 543         }
 544
 545         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 546                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 547                 result = -EFAULT;
 548                 goto end;
 549         }
 550
 551         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 552             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 553             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 554                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 555                 result = -EFAULT;
 556                 goto end;
 557         }
 558 end:
 559         kfree(buffer.pointer);
 560         return result;
 561 }
 562
 563 int acpi_processor_preregister_performance(
 564                 struct acpi_processor_performance __percpu *performance)
 565 {
 566         int count, count_target;
 567         int retval = 0;
 568         unsigned int i, j;
 569         cpumask_var_t covered_cpus;
 570         struct acpi_processor *pr;
 571         struct acpi_psd_package *pdomain;
 572         struct acpi_processor *match_pr;
 573         struct acpi_psd_package *match_pdomain;
 574
 575         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 576                 return -ENOMEM;
 577
 578         mutex_lock(&performance_mutex);
 579
 580         /*
 581          * Check if another driver has already registered, and abort before
 582          * changing pr->performance if it has. Check input data as well.
 583          */
 584         for_each_possible_cpu(i) {
 585                 pr = per_cpu(processors, i);
 586                 if (!pr) {
 587                         /* Look only at processors in ACPI namespace */
 588                         continue;
 589                 }
 590
 591                 if (pr->performance) {
 592                         retval = -EBUSY;
 593                         goto err_out;
 594                 }
 595
 596                 if (!performance || !per_cpu_ptr(performance, i)) {
 597                         retval = -EINVAL;
 598                         goto err_out;
 599                 }
 600         }
 601
 602         /* Call _PSD for all CPUs */
 603         for_each_possible_cpu(i) {
 604                 pr = per_cpu(processors, i);
 605                 if (!pr)
 606                         continue;
 607
 608                 pr->performance = per_cpu_ptr(performance, i);
 609                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 610                 if (acpi_processor_get_psd(pr)) {
 611                         retval = -EINVAL;
 612                         continue;
 613                 }
 614         }
 615         if (retval)
 616                 goto err_ret;
 617
 618         /*
 619          * Now that we have _PSD data from all CPUs, lets setup P-state
 620          * domain info.
 621          */
 622         for_each_possible_cpu(i) {
 623                 pr = per_cpu(processors, i);
 624                 if (!pr)
 625                         continue;
 626
 627                 if (cpumask_test_cpu(i, covered_cpus))
 628                         continue;
 629
 630                 pdomain = &(pr->performance->domain_info);
 631                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 632                 cpumask_set_cpu(i, covered_cpus);
 633                 if (pdomain->num_processors <= 1)
 634                         continue;
 635
 636                 /* Validate the Domain info */
 637                 count_target = pdomain->num_processors;
 638                 count = 1;
 639                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 640                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 641                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 642                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 643                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 645
 646                 for_each_possible_cpu(j) {
 647                         if (i == j)
 648                                 continue;
 649
 650                         match_pr = per_cpu(processors, j);
 651                         if (!match_pr)
 652                                 continue;
 653
 654                         match_pdomain = &(match_pr->performance->domain_info);
 655                         if (match_pdomain->domain != pdomain->domain)
 656                                 continue;
 657
 658                         /* Here i and j are in the same domain */
 659
 660                         if (match_pdomain->num_processors != count_target) {
 661                                 retval = -EINVAL;
 662                                 goto err_ret;
 663                         }
 664
 665                         if (pdomain->coord_type != match_pdomain->coord_type) {
 666                                 retval = -EINVAL;
 667                                 goto err_ret;
 668                         }
 669
 670                         cpumask_set_cpu(j, covered_cpus);
 671                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 672                         count++;
 673                 }
 674
 675                 for_each_possible_cpu(j) {
 676                         if (i == j)
 677                                 continue;
 678
 679                         match_pr = per_cpu(processors, j);
 680                         if (!match_pr)
 681                                 continue;
 682
 683                         match_pdomain = &(match_pr->performance->domain_info);
 684                         if (match_pdomain->domain != pdomain->domain)
 685                                 continue;
 686
 687                         match_pr->performance->shared_type =
 688                                         pr->performance->shared_type;
 689                         cpumask_copy(match_pr->performance->shared_cpu_map,
 690                                      pr->performance->shared_cpu_map);
 691                 }
 692         }
 693
 694 err_ret:
 695         for_each_possible_cpu(i) {
 696                 pr = per_cpu(processors, i);
 697                 if (!pr || !pr->performance)
 698                         continue;
 699
 700                 /* Assume no coordination on any error parsing domain info */
 701                 if (retval) {
 702                         cpumask_clear(pr->performance->shared_cpu_map);
 703                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 704                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 705                 }
 706                 pr->performance = NULL; /* Will be set for real in register */
 707         }
 708
 709 err_out:
 710         mutex_unlock(&performance_mutex);
 711         free_cpumask_var(covered_cpus);
 712         return retval;
 713 }
 714 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 715
 716 int
 717 acpi_processor_register_performance(struct acpi_processor_performance
 718                                     *performance, unsigned int cpu)
 719 {
 720         struct acpi_processor *pr;
 721
 722         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 723                 return -EINVAL;
 724
 725         mutex_lock(&performance_mutex);
 726
 727         pr = per_cpu(processors, cpu);
 728         if (!pr) {
 729                 mutex_unlock(&performance_mutex);
 730                 return -ENODEV;
 731         }
 732
 733         if (pr->performance) {
 734                 mutex_unlock(&performance_mutex);
 735                 return -EBUSY;
 736         }
 737
 738         WARN_ON(!performance);
 739
 740         pr->performance = performance;
 741
 742         if (acpi_processor_get_performance_info(pr)) {
 743                 pr->performance = NULL;
 744                 mutex_unlock(&performance_mutex);
 745                 return -EIO;
 746         }
 747
 748         mutex_unlock(&performance_mutex);
 749         return 0;
 750 }
 751
 752 EXPORT_SYMBOL(acpi_processor_register_performance);
 753
 754 void
 755 acpi_processor_unregister_performance(struct acpi_processor_performance
 756                                       *performance, unsigned int cpu)
 757 {
 758         struct acpi_processor *pr;
 759
 760         mutex_lock(&performance_mutex);
 761
 762         pr = per_cpu(processors, cpu);
 763         if (!pr) {
 764                 mutex_unlock(&performance_mutex);
 765                 return;
 766         }
 767
 768         if (pr->performance)
 769                 kfree(pr->performance->states);
 770         pr->performance = NULL;
 771
 772         mutex_unlock(&performance_mutex);
 773
 774         return;
 775 }
 776
 777 EXPORT_SYMBOL(acpi_processor_unregister_performance);