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_ACPI_CPUFREQ_PROC_INTF
  35 #include <linux/proc_fs.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/mutex.h>
  38
  39 #include <asm/uaccess.h>
  40 #endif
  41
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44
  45 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  46 #define ACPI_PROCESSOR_CLASS            "processor"
  47 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  48 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  49 ACPI_MODULE_NAME("processor_perflib");
  50
  51 static DEFINE_MUTEX(performance_mutex);
  52
  53 /*
  54  * _PPC support is implemented as a CPUfreq policy notifier:
  55  * This means each time a CPUfreq driver registered also with
  56  * the ACPI core is asked to change the speed policy, the maximum
  57  * value is adjusted so that it is within the platform limit.
  58  *
  59  * Also, when a new platform limit value is detected, the CPUfreq
  60  * policy is adjusted accordingly.
  61  */
  62
  63 #define PPC_REGISTERED   1
  64 #define PPC_IN_USE       2
  65
  66 static int acpi_processor_ppc_status = 0;
  67
  68 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  69                                        unsigned long event, void *data)
  70 {
  71         struct cpufreq_policy *policy = data;
  72         struct acpi_processor *pr;
  73         unsigned int ppc = 0;
  74
  75         mutex_lock(&performance_mutex);
  76
  77         if (event != CPUFREQ_INCOMPATIBLE)
  78                 goto out;
  79
  80         pr = processors[policy->cpu];
  81         if (!pr || !pr->performance)
  82                 goto out;
  83
  84         ppc = (unsigned int)pr->performance_platform_limit;
  85
  86         if (ppc >= pr->performance->state_count)
  87                 goto out;
  88
  89         cpufreq_verify_within_limits(policy, 0,
  90                                      pr->performance->states[ppc].
  91                                      core_frequency * 1000);
  92
  93       out:
  94         mutex_unlock(&performance_mutex);
  95
  96         return 0;
  97 }
  98
  99 static struct notifier_block acpi_ppc_notifier_block = {
 100         .notifier_call = acpi_processor_ppc_notifier,
 101 };
 102
 103 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 104 {
 105         acpi_status status = 0;
 106         unsigned long ppc = 0;
 107
 108
 109         if (!pr)
 110                 return -EINVAL;
 111
 112         /*
 113          * _PPC indicates the maximum state currently supported by the platform
 114          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 115          */
 116         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 117
 118         if (status != AE_NOT_FOUND)
 119                 acpi_processor_ppc_status |= PPC_IN_USE;
 120
 121         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 122                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 123                 return -ENODEV;
 124         }
 125
 126         pr->performance_platform_limit = (int)ppc;
 127
 128         return 0;
 129 }
 130
 131 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 132 {
 133         int ret = acpi_processor_get_platform_limit(pr);
 134         if (ret < 0)
 135                 return (ret);
 136         else
 137                 return cpufreq_update_policy(pr->id);
 138 }
 139
 140 void acpi_processor_ppc_init(void)
 141 {
 142         if (!cpufreq_register_notifier
 143             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 144                 acpi_processor_ppc_status |= PPC_REGISTERED;
 145         else
 146                 printk(KERN_DEBUG
 147                        "Warning: Processor Platform Limit not supported.\n");
 148 }
 149
 150 void acpi_processor_ppc_exit(void)
 151 {
 152         if (acpi_processor_ppc_status & PPC_REGISTERED)
 153                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 154                                             CPUFREQ_POLICY_NOTIFIER);
 155
 156         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 157 }
 158
 159 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 160 {
 161         int result = 0;
 162         acpi_status status = 0;
 163         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 164         union acpi_object *pct = NULL;
 165         union acpi_object obj = { 0 };
 166
 167
 168         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 169         if (ACPI_FAILURE(status)) {
 170                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 171                 return -ENODEV;
 172         }
 173
 174         pct = (union acpi_object *)buffer.pointer;
 175         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 176             || (pct->package.count != 2)) {
 177                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 178                 result = -EFAULT;
 179                 goto end;
 180         }
 181
 182         /*
 183          * control_register
 184          */
 185
 186         obj = pct->package.elements[0];
 187
 188         if ((obj.type != ACPI_TYPE_BUFFER)
 189             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 190             || (obj.buffer.pointer == NULL)) {
 191                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 192                 result = -EFAULT;
 193                 goto end;
 194         }
 195         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 196                sizeof(struct acpi_pct_register));
 197
 198         /*
 199          * status_register
 200          */
 201
 202         obj = pct->package.elements[1];
 203
 204         if ((obj.type != ACPI_TYPE_BUFFER)
 205             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 206             || (obj.buffer.pointer == NULL)) {
 207                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 208                 result = -EFAULT;
 209                 goto end;
 210         }
 211
 212         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 213                sizeof(struct acpi_pct_register));
 214
 215       end:
 216         kfree(buffer.pointer);
 217
 218         return result;
 219 }
 220
 221 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 222 {
 223         int result = 0;
 224         acpi_status status = AE_OK;
 225         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 226         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 227         struct acpi_buffer state = { 0, NULL };
 228         union acpi_object *pss = NULL;
 229         int i;
 230
 231
 232         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 233         if (ACPI_FAILURE(status)) {
 234                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 235                 return -ENODEV;
 236         }
 237
 238         pss = buffer.pointer;
 239         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 240                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 241                 result = -EFAULT;
 242                 goto end;
 243         }
 244
 245         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 246                           pss->package.count));
 247
 248         pr->performance->state_count = pss->package.count;
 249         pr->performance->states =
 250             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 251                     GFP_KERNEL);
 252         if (!pr->performance->states) {
 253                 result = -ENOMEM;
 254                 goto end;
 255         }
 256
 257         for (i = 0; i < pr->performance->state_count; i++) {
 258
 259                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 260
 261                 state.length = sizeof(struct acpi_processor_px);
 262                 state.pointer = px;
 263
 264                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 265
 266                 status = acpi_extract_package(&(pss->package.elements[i]),
 267                                               &format, &state);
 268                 if (ACPI_FAILURE(status)) {
 269                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 270                         result = -EFAULT;
 271                         kfree(pr->performance->states);
 272                         goto end;
 273                 }
 274
 275                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 276                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 277                                   i,
 278                                   (u32) px->core_frequency,
 279                                   (u32) px->power,
 280                                   (u32) px->transition_latency,
 281                                   (u32) px->bus_master_latency,
 282                                   (u32) px->control, (u32) px->status));
 283
 284                 if (!px->core_frequency) {
 285                         printk(KERN_ERR PREFIX
 286                                     "Invalid _PSS data: freq is zero\n");
 287                         result = -EFAULT;
 288                         kfree(pr->performance->states);
 289                         goto end;
 290                 }
 291         }
 292
 293       end:
 294         kfree(buffer.pointer);
 295
 296         return result;
 297 }
 298
 299 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 300 {
 301         int result = 0;
 302         acpi_status status = AE_OK;
 303         acpi_handle handle = NULL;
 304
 305
 306         if (!pr || !pr->performance || !pr->handle)
 307                 return -EINVAL;
 308
 309         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 310         if (ACPI_FAILURE(status)) {
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 312                                   "ACPI-based processor performance control unavailable\n"));
 313                 return -ENODEV;
 314         }
 315
 316         result = acpi_processor_get_performance_control(pr);
 317         if (result)
 318                 return result;
 319
 320         result = acpi_processor_get_performance_states(pr);
 321         if (result)
 322                 return result;
 323
 324         return 0;
 325 }
 326
 327 int acpi_processor_notify_smm(struct module *calling_module)
 328 {
 329         acpi_status status;
 330         static int is_done = 0;
 331
 332
 333         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 334                 return -EBUSY;
 335
 336         if (!try_module_get(calling_module))
 337                 return -EINVAL;
 338
 339         /* is_done is set to negative if an error occured,
 340          * and to postitive if _no_ error occured, but SMM
 341          * was already notified. This avoids double notification
 342          * which might lead to unexpected results...
 343          */
 344         if (is_done > 0) {
 345                 module_put(calling_module);
 346                 return 0;
 347         } else if (is_done < 0) {
 348                 module_put(calling_module);
 349                 return is_done;
 350         }
 351
 352         is_done = -EIO;
 353
 354         /* Can't write pstate_control to smi_command if either value is zero */
 355         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 357                 module_put(calling_module);
 358                 return 0;
 359         }
 360
 361         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 362                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 363                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 364
 365         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 366                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 367         if (ACPI_FAILURE(status)) {
 368                 ACPI_EXCEPTION((AE_INFO, status,
 369                                 "Failed to write pstate_control [0x%x] to "
 370                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 371                                 acpi_gbl_FADT.smi_command));
 372                 module_put(calling_module);
 373                 return status;
 374         }
 375
 376         /* Success. If there's no _PPC, we need to fear nothing, so
 377          * we can allow the cpufreq driver to be rmmod'ed. */
 378         is_done = 1;
 379
 380         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 381                 module_put(calling_module);
 382
 383         return 0;
 384 }
 385
 386 EXPORT_SYMBOL(acpi_processor_notify_smm);
 387
 388 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 389 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 390
 391 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 392 static struct file_operations acpi_processor_perf_fops = {
 393         .open = acpi_processor_perf_open_fs,
 394         .read = seq_read,
 395         .llseek = seq_lseek,
 396         .release = single_release,
 397 };
 398
 399 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 400 {
 401         struct acpi_processor *pr = seq->private;
 402         int i;
 403
 404
 405         if (!pr)
 406                 goto end;
 407
 408         if (!pr->performance) {
 409                 seq_puts(seq, "<not supported>\n");
 410                 goto end;
 411         }
 412
 413         seq_printf(seq, "state count:             %d\n"
 414                    "active state:            P%d\n",
 415                    pr->performance->state_count, pr->performance->state);
 416
 417         seq_puts(seq, "states:\n");
 418         for (i = 0; i < pr->performance->state_count; i++)
 419                 seq_printf(seq,
 420                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 421                            (i == pr->performance->state ? '*' : ' '), i,
 422                            (u32) pr->performance->states[i].core_frequency,
 423                            (u32) pr->performance->states[i].power,
 424                            (u32) pr->performance->states[i].transition_latency);
 425
 426       end:
 427         return 0;
 428 }
 429
 430 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 431 {
 432         return single_open(file, acpi_processor_perf_seq_show,
 433                            PDE(inode)->data);
 434 }
 435
 436 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 437 {
 438         struct proc_dir_entry *entry = NULL;
 439         struct acpi_device *device = NULL;
 440
 441
 442         if (acpi_bus_get_device(pr->handle, &device))
 443                 return;
 444
 445         /* add file 'performance' [R/W] */
 446         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 447                                   S_IFREG | S_IRUGO,
 448                                   acpi_device_dir(device));
 449         if (entry){
 450                 entry->proc_fops = &acpi_processor_perf_fops;
 451                 entry->data = acpi_driver_data(device);
 452                 entry->owner = THIS_MODULE;
 453         }
 454         return;
 455 }
 456
 457 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 458 {
 459         struct acpi_device *device = NULL;
 460
 461
 462         if (acpi_bus_get_device(pr->handle, &device))
 463                 return;
 464
 465         /* remove file 'performance' */
 466         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 467                           acpi_device_dir(device));
 468
 469         return;
 470 }
 471
 472 #else
 473 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 474 {
 475         return;
 476 }
 477 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 478 {
 479         return;
 480 }
 481 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 482
 483 static int acpi_processor_get_psd(struct acpi_processor *pr)
 484 {
 485         int result = 0;
 486         acpi_status status = AE_OK;
 487         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 488         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 489         struct acpi_buffer state = {0, NULL};
 490         union acpi_object  *psd = NULL;
 491         struct acpi_psd_package *pdomain;
 492
 493         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 494         if (ACPI_FAILURE(status)) {
 495                 return -ENODEV;
 496         }
 497
 498         psd = buffer.pointer;
 499         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 500                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 501                 result = -EFAULT;
 502                 goto end;
 503         }
 504
 505         if (psd->package.count != 1) {
 506                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 507                 result = -EFAULT;
 508                 goto end;
 509         }
 510
 511         pdomain = &(pr->performance->domain_info);
 512
 513         state.length = sizeof(struct acpi_psd_package);
 514         state.pointer = pdomain;
 515
 516         status = acpi_extract_package(&(psd->package.elements[0]),
 517                 &format, &state);
 518         if (ACPI_FAILURE(status)) {
 519                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 520                 result = -EFAULT;
 521                 goto end;
 522         }
 523
 524         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 525                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 526                 result = -EFAULT;
 527                 goto end;
 528         }
 529
 530         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 531                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 532                 result = -EFAULT;
 533                 goto end;
 534         }
 535
 536 end:
 537         kfree(buffer.pointer);
 538         return result;
 539 }
 540
 541 int acpi_processor_preregister_performance(
 542                 struct acpi_processor_performance **performance)
 543 {
 544         int count, count_target;
 545         int retval = 0;
 546         unsigned int i, j;
 547         cpumask_t covered_cpus;
 548         struct acpi_processor *pr;
 549         struct acpi_psd_package *pdomain;
 550         struct acpi_processor *match_pr;
 551         struct acpi_psd_package *match_pdomain;
 552
 553         mutex_lock(&performance_mutex);
 554
 555         retval = 0;
 556
 557         /* Call _PSD for all CPUs */
 558         for_each_possible_cpu(i) {
 559                 pr = processors[i];
 560                 if (!pr) {
 561                         /* Look only at processors in ACPI namespace */
 562                         continue;
 563                 }
 564
 565                 if (pr->performance) {
 566                         retval = -EBUSY;
 567                         continue;
 568                 }
 569
 570                 if (!performance || !performance[i]) {
 571                         retval = -EINVAL;
 572                         continue;
 573                 }
 574
 575                 pr->performance = performance[i];
 576                 cpu_set(i, pr->performance->shared_cpu_map);
 577                 if (acpi_processor_get_psd(pr)) {
 578                         retval = -EINVAL;
 579                         continue;
 580                 }
 581         }
 582         if (retval)
 583                 goto err_ret;
 584
 585         /*
 586          * Now that we have _PSD data from all CPUs, lets setup P-state
 587          * domain info.
 588          */
 589         for_each_possible_cpu(i) {
 590                 pr = processors[i];
 591                 if (!pr)
 592                         continue;
 593
 594                 /* Basic validity check for domain info */
 595                 pdomain = &(pr->performance->domain_info);
 596                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 597                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 598                         retval = -EINVAL;
 599                         goto err_ret;
 600                 }
 601                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 602                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 603                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 604                         retval = -EINVAL;
 605                         goto err_ret;
 606                 }
 607         }
 608
 609         cpus_clear(covered_cpus);
 610         for_each_possible_cpu(i) {
 611                 pr = processors[i];
 612                 if (!pr)
 613                         continue;
 614
 615                 if (cpu_isset(i, covered_cpus))
 616                         continue;
 617
 618                 pdomain = &(pr->performance->domain_info);
 619                 cpu_set(i, pr->performance->shared_cpu_map);
 620                 cpu_set(i, covered_cpus);
 621                 if (pdomain->num_processors <= 1)
 622                         continue;
 623
 624                 /* Validate the Domain info */
 625                 count_target = pdomain->num_processors;
 626                 count = 1;
 627                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 628                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 629                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 630                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 631                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 632                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 633
 634                 for_each_possible_cpu(j) {
 635                         if (i == j)
 636                                 continue;
 637
 638                         match_pr = processors[j];
 639                         if (!match_pr)
 640                                 continue;
 641
 642                         match_pdomain = &(match_pr->performance->domain_info);
 643                         if (match_pdomain->domain != pdomain->domain)
 644                                 continue;
 645
 646                         /* Here i and j are in the same domain */
 647
 648                         if (match_pdomain->num_processors != count_target) {
 649                                 retval = -EINVAL;
 650                                 goto err_ret;
 651                         }
 652
 653                         if (pdomain->coord_type != match_pdomain->coord_type) {
 654                                 retval = -EINVAL;
 655                                 goto err_ret;
 656                         }
 657
 658                         cpu_set(j, covered_cpus);
 659                         cpu_set(j, pr->performance->shared_cpu_map);
 660                         count++;
 661                 }
 662
 663                 for_each_possible_cpu(j) {
 664                         if (i == j)
 665                                 continue;
 666
 667                         match_pr = processors[j];
 668                         if (!match_pr)
 669                                 continue;
 670
 671                         match_pdomain = &(match_pr->performance->domain_info);
 672                         if (match_pdomain->domain != pdomain->domain)
 673                                 continue;
 674
 675                         match_pr->performance->shared_type =
 676                                         pr->performance->shared_type;
 677                         match_pr->performance->shared_cpu_map =
 678                                 pr->performance->shared_cpu_map;
 679                 }
 680         }
 681
 682 err_ret:
 683         for_each_possible_cpu(i) {
 684                 pr = processors[i];
 685                 if (!pr || !pr->performance)
 686                         continue;
 687
 688                 /* Assume no coordination on any error parsing domain info */
 689                 if (retval) {
 690                         cpus_clear(pr->performance->shared_cpu_map);
 691                         cpu_set(i, pr->performance->shared_cpu_map);
 692                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 693                 }
 694                 pr->performance = NULL; /* Will be set for real in register */
 695         }
 696
 697         mutex_unlock(&performance_mutex);
 698         return retval;
 699 }
 700 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 701
 702
 703 int
 704 acpi_processor_register_performance(struct acpi_processor_performance
 705                                     *performance, unsigned int cpu)
 706 {
 707         struct acpi_processor *pr;
 708
 709
 710         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 711                 return -EINVAL;
 712
 713         mutex_lock(&performance_mutex);
 714
 715         pr = processors[cpu];
 716         if (!pr) {
 717                 mutex_unlock(&performance_mutex);
 718                 return -ENODEV;
 719         }
 720
 721         if (pr->performance) {
 722                 mutex_unlock(&performance_mutex);
 723                 return -EBUSY;
 724         }
 725
 726         WARN_ON(!performance);
 727
 728         pr->performance = performance;
 729
 730         if (acpi_processor_get_performance_info(pr)) {
 731                 pr->performance = NULL;
 732                 mutex_unlock(&performance_mutex);
 733                 return -EIO;
 734         }
 735
 736         acpi_cpufreq_add_file(pr);
 737
 738         mutex_unlock(&performance_mutex);
 739         return 0;
 740 }
 741
 742 EXPORT_SYMBOL(acpi_processor_register_performance);
 743
 744 void
 745 acpi_processor_unregister_performance(struct acpi_processor_performance
 746                                       *performance, unsigned int cpu)
 747 {
 748         struct acpi_processor *pr;
 749
 750
 751         mutex_lock(&performance_mutex);
 752
 753         pr = processors[cpu];
 754         if (!pr) {
 755                 mutex_unlock(&performance_mutex);
 756                 return;
 757         }
 758
 759         if (pr->performance)
 760                 kfree(pr->performance->states);
 761         pr->performance = NULL;
 762
 763         acpi_cpufreq_remove_file(pr);
 764
 765         mutex_unlock(&performance_mutex);
 766
 767         return;
 768 }
 769
 770 EXPORT_SYMBOL(acpi_processor_unregister_performance);