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