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   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 static unsigned int ignore_ppc = 0;
  64 module_param(ignore_ppc, uint, 0644);
  65 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  66                  "limited by BIOS, this should help");
  67
  68 #define PPC_REGISTERED   1
  69 #define PPC_IN_USE       2
  70
  71 static int acpi_processor_ppc_status = 0;
  72
  73 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  74                                        unsigned long event, void *data)
  75 {
  76         struct cpufreq_policy *policy = data;
  77         struct acpi_processor *pr;
  78         unsigned int ppc = 0;
  79
  80         if (ignore_ppc)
  81                 return 0;
  82
  83         mutex_lock(&performance_mutex);
  84
  85         if (event != CPUFREQ_INCOMPATIBLE)
  86                 goto out;
  87
  88         pr = processors[policy->cpu];
  89         if (!pr || !pr->performance)
  90                 goto out;
  91
  92         ppc = (unsigned int)pr->performance_platform_limit;
  93
  94         if (ppc >= pr->performance->state_count)
  95                 goto out;
  96
  97         cpufreq_verify_within_limits(policy, 0,
  98                                      pr->performance->states[ppc].
  99                                      core_frequency * 1000);
 100
 101       out:
 102         mutex_unlock(&performance_mutex);
 103
 104         return 0;
 105 }
 106
 107 static struct notifier_block acpi_ppc_notifier_block = {
 108         .notifier_call = acpi_processor_ppc_notifier,
 109 };
 110
 111 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 112 {
 113         acpi_status status = 0;
 114         unsigned long ppc = 0;
 115
 116
 117         if (!pr)
 118                 return -EINVAL;
 119
 120         /*
 121          * _PPC indicates the maximum state currently supported by the platform
 122          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 123          */
 124         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 125
 126         if (status != AE_NOT_FOUND)
 127                 acpi_processor_ppc_status |= PPC_IN_USE;
 128
 129         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 130                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 131                 return -ENODEV;
 132         }
 133
 134         pr->performance_platform_limit = (int)ppc;
 135
 136         return 0;
 137 }
 138
 139 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 140 {
 141         int ret;
 142
 143         if (ignore_ppc)
 144                 return 0;
 145
 146         ret = acpi_processor_get_platform_limit(pr);
 147
 148         if (ret < 0)
 149                 return (ret);
 150         else
 151                 return cpufreq_update_policy(pr->id);
 152 }
 153
 154 void acpi_processor_ppc_init(void)
 155 {
 156         if (!cpufreq_register_notifier
 157             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 158                 acpi_processor_ppc_status |= PPC_REGISTERED;
 159         else
 160                 printk(KERN_DEBUG
 161                        "Warning: Processor Platform Limit not supported.\n");
 162 }
 163
 164 void acpi_processor_ppc_exit(void)
 165 {
 166         if (acpi_processor_ppc_status & PPC_REGISTERED)
 167                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 168                                             CPUFREQ_POLICY_NOTIFIER);
 169
 170         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 171 }
 172
 173 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 174 {
 175         int result = 0;
 176         acpi_status status = 0;
 177         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 178         union acpi_object *pct = NULL;
 179         union acpi_object obj = { 0 };
 180
 181
 182         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 183         if (ACPI_FAILURE(status)) {
 184                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 185                 return -ENODEV;
 186         }
 187
 188         pct = (union acpi_object *)buffer.pointer;
 189         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 190             || (pct->package.count != 2)) {
 191                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 192                 result = -EFAULT;
 193                 goto end;
 194         }
 195
 196         /*
 197          * control_register
 198          */
 199
 200         obj = pct->package.elements[0];
 201
 202         if ((obj.type != ACPI_TYPE_BUFFER)
 203             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 204             || (obj.buffer.pointer == NULL)) {
 205                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 206                 result = -EFAULT;
 207                 goto end;
 208         }
 209         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 210                sizeof(struct acpi_pct_register));
 211
 212         /*
 213          * status_register
 214          */
 215
 216         obj = pct->package.elements[1];
 217
 218         if ((obj.type != ACPI_TYPE_BUFFER)
 219             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 220             || (obj.buffer.pointer == NULL)) {
 221                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 222                 result = -EFAULT;
 223                 goto end;
 224         }
 225
 226         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 227                sizeof(struct acpi_pct_register));
 228
 229       end:
 230         kfree(buffer.pointer);
 231
 232         return result;
 233 }
 234
 235 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 236 {
 237         int result = 0;
 238         acpi_status status = AE_OK;
 239         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 240         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 241         struct acpi_buffer state = { 0, NULL };
 242         union acpi_object *pss = NULL;
 243         int i;
 244
 245
 246         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 247         if (ACPI_FAILURE(status)) {
 248                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 249                 return -ENODEV;
 250         }
 251
 252         pss = buffer.pointer;
 253         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 254                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 255                 result = -EFAULT;
 256                 goto end;
 257         }
 258
 259         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 260                           pss->package.count));
 261
 262         pr->performance->state_count = pss->package.count;
 263         pr->performance->states =
 264             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 265                     GFP_KERNEL);
 266         if (!pr->performance->states) {
 267                 result = -ENOMEM;
 268                 goto end;
 269         }
 270
 271         for (i = 0; i < pr->performance->state_count; i++) {
 272
 273                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 274
 275                 state.length = sizeof(struct acpi_processor_px);
 276                 state.pointer = px;
 277
 278                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 279
 280                 status = acpi_extract_package(&(pss->package.elements[i]),
 281                                               &format, &state);
 282                 if (ACPI_FAILURE(status)) {
 283                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 284                         result = -EFAULT;
 285                         kfree(pr->performance->states);
 286                         goto end;
 287                 }
 288
 289                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 290                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 291                                   i,
 292                                   (u32) px->core_frequency,
 293                                   (u32) px->power,
 294                                   (u32) px->transition_latency,
 295                                   (u32) px->bus_master_latency,
 296                                   (u32) px->control, (u32) px->status));
 297
 298                 if (!px->core_frequency) {
 299                         printk(KERN_ERR PREFIX
 300                                     "Invalid _PSS data: freq is zero\n");
 301                         result = -EFAULT;
 302                         kfree(pr->performance->states);
 303                         goto end;
 304                 }
 305         }
 306
 307       end:
 308         kfree(buffer.pointer);
 309
 310         return result;
 311 }
 312
 313 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 314 {
 315         int result = 0;
 316         acpi_status status = AE_OK;
 317         acpi_handle handle = NULL;
 318
 319
 320         if (!pr || !pr->performance || !pr->handle)
 321                 return -EINVAL;
 322
 323         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 324         if (ACPI_FAILURE(status)) {
 325                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 326                                   "ACPI-based processor performance control unavailable\n"));
 327                 return -ENODEV;
 328         }
 329
 330         result = acpi_processor_get_performance_control(pr);
 331         if (result)
 332                 return result;
 333
 334         result = acpi_processor_get_performance_states(pr);
 335         if (result)
 336                 return result;
 337
 338         return 0;
 339 }
 340
 341 int acpi_processor_notify_smm(struct module *calling_module)
 342 {
 343         acpi_status status;
 344         static int is_done = 0;
 345
 346
 347         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 348                 return -EBUSY;
 349
 350         if (!try_module_get(calling_module))
 351                 return -EINVAL;
 352
 353         /* is_done is set to negative if an error occured,
 354          * and to postitive if _no_ error occured, but SMM
 355          * was already notified. This avoids double notification
 356          * which might lead to unexpected results...
 357          */
 358         if (is_done > 0) {
 359                 module_put(calling_module);
 360                 return 0;
 361         } else if (is_done < 0) {
 362                 module_put(calling_module);
 363                 return is_done;
 364         }
 365
 366         is_done = -EIO;
 367
 368         /* Can't write pstate_control to smi_command if either value is zero */
 369         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 370                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 371                 module_put(calling_module);
 372                 return 0;
 373         }
 374
 375         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 376                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 377                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 378
 379         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 380                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 381         if (ACPI_FAILURE(status)) {
 382                 ACPI_EXCEPTION((AE_INFO, status,
 383                                 "Failed to write pstate_control [0x%x] to "
 384                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 385                                 acpi_gbl_FADT.smi_command));
 386                 module_put(calling_module);
 387                 return status;
 388         }
 389
 390         /* Success. If there's no _PPC, we need to fear nothing, so
 391          * we can allow the cpufreq driver to be rmmod'ed. */
 392         is_done = 1;
 393
 394         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 395                 module_put(calling_module);
 396
 397         return 0;
 398 }
 399
 400 EXPORT_SYMBOL(acpi_processor_notify_smm);
 401
 402 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 403 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 404
 405 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 406 static struct file_operations acpi_processor_perf_fops = {
 407         .open = acpi_processor_perf_open_fs,
 408         .read = seq_read,
 409         .llseek = seq_lseek,
 410         .release = single_release,
 411 };
 412
 413 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 414 {
 415         struct acpi_processor *pr = seq->private;
 416         int i;
 417
 418
 419         if (!pr)
 420                 goto end;
 421
 422         if (!pr->performance) {
 423                 seq_puts(seq, "<not supported>\n");
 424                 goto end;
 425         }
 426
 427         seq_printf(seq, "state count:             %d\n"
 428                    "active state:            P%d\n",
 429                    pr->performance->state_count, pr->performance->state);
 430
 431         seq_puts(seq, "states:\n");
 432         for (i = 0; i < pr->performance->state_count; i++)
 433                 seq_printf(seq,
 434                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 435                            (i == pr->performance->state ? '*' : ' '), i,
 436                            (u32) pr->performance->states[i].core_frequency,
 437                            (u32) pr->performance->states[i].power,
 438                            (u32) pr->performance->states[i].transition_latency);
 439
 440       end:
 441         return 0;
 442 }
 443
 444 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 445 {
 446         return single_open(file, acpi_processor_perf_seq_show,
 447                            PDE(inode)->data);
 448 }
 449
 450 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 451 {
 452         struct proc_dir_entry *entry = NULL;
 453         struct acpi_device *device = NULL;
 454
 455
 456         if (acpi_bus_get_device(pr->handle, &device))
 457                 return;
 458
 459         /* add file 'performance' [R/W] */
 460         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 461                                   S_IFREG | S_IRUGO,
 462                                   acpi_device_dir(device));
 463         if (entry){
 464                 entry->proc_fops = &acpi_processor_perf_fops;
 465                 entry->data = acpi_driver_data(device);
 466                 entry->owner = THIS_MODULE;
 467         }
 468         return;
 469 }
 470
 471 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 472 {
 473         struct acpi_device *device = NULL;
 474
 475
 476         if (acpi_bus_get_device(pr->handle, &device))
 477                 return;
 478
 479         /* remove file 'performance' */
 480         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 481                           acpi_device_dir(device));
 482
 483         return;
 484 }
 485
 486 #else
 487 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 488 {
 489         return;
 490 }
 491 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 492 {
 493         return;
 494 }
 495 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 496
 497 static int acpi_processor_get_psd(struct acpi_processor *pr)
 498 {
 499         int result = 0;
 500         acpi_status status = AE_OK;
 501         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 502         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 503         struct acpi_buffer state = {0, NULL};
 504         union acpi_object  *psd = NULL;
 505         struct acpi_psd_package *pdomain;
 506
 507         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 508         if (ACPI_FAILURE(status)) {
 509                 return -ENODEV;
 510         }
 511
 512         psd = buffer.pointer;
 513         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 514                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 515                 result = -EFAULT;
 516                 goto end;
 517         }
 518
 519         if (psd->package.count != 1) {
 520                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 521                 result = -EFAULT;
 522                 goto end;
 523         }
 524
 525         pdomain = &(pr->performance->domain_info);
 526
 527         state.length = sizeof(struct acpi_psd_package);
 528         state.pointer = pdomain;
 529
 530         status = acpi_extract_package(&(psd->package.elements[0]),
 531                 &format, &state);
 532         if (ACPI_FAILURE(status)) {
 533                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 534                 result = -EFAULT;
 535                 goto end;
 536         }
 537
 538         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 539                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 540                 result = -EFAULT;
 541                 goto end;
 542         }
 543
 544         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 545                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 546                 result = -EFAULT;
 547                 goto end;
 548         }
 549
 550 end:
 551         kfree(buffer.pointer);
 552         return result;
 553 }
 554
 555 int acpi_processor_preregister_performance(
 556                 struct acpi_processor_performance *performance)
 557 {
 558         int count, count_target;
 559         int retval = 0;
 560         unsigned int i, j;
 561         cpumask_t covered_cpus;
 562         struct acpi_processor *pr;
 563         struct acpi_psd_package *pdomain;
 564         struct acpi_processor *match_pr;
 565         struct acpi_psd_package *match_pdomain;
 566
 567         mutex_lock(&performance_mutex);
 568
 569         retval = 0;
 570
 571         /* Call _PSD for all CPUs */
 572         for_each_possible_cpu(i) {
 573                 pr = processors[i];
 574                 if (!pr) {
 575                         /* Look only at processors in ACPI namespace */
 576                         continue;
 577                 }
 578
 579                 if (pr->performance) {
 580                         retval = -EBUSY;
 581                         continue;
 582                 }
 583
 584                 if (!performance || !percpu_ptr(performance, i)) {
 585                         retval = -EINVAL;
 586                         continue;
 587                 }
 588
 589                 pr->performance = percpu_ptr(performance, i);
 590                 cpu_set(i, pr->performance->shared_cpu_map);
 591                 if (acpi_processor_get_psd(pr)) {
 592                         retval = -EINVAL;
 593                         continue;
 594                 }
 595         }
 596         if (retval)
 597                 goto err_ret;
 598
 599         /*
 600          * Now that we have _PSD data from all CPUs, lets setup P-state
 601          * domain info.
 602          */
 603         for_each_possible_cpu(i) {
 604                 pr = processors[i];
 605                 if (!pr)
 606                         continue;
 607
 608                 /* Basic validity check for domain info */
 609                 pdomain = &(pr->performance->domain_info);
 610                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 611                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 612                         retval = -EINVAL;
 613                         goto err_ret;
 614                 }
 615                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 616                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 617                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 618                         retval = -EINVAL;
 619                         goto err_ret;
 620                 }
 621         }
 622
 623         cpus_clear(covered_cpus);
 624         for_each_possible_cpu(i) {
 625                 pr = processors[i];
 626                 if (!pr)
 627                         continue;
 628
 629                 if (cpu_isset(i, covered_cpus))
 630                         continue;
 631
 632                 pdomain = &(pr->performance->domain_info);
 633                 cpu_set(i, pr->performance->shared_cpu_map);
 634                 cpu_set(i, covered_cpus);
 635                 if (pdomain->num_processors <= 1)
 636                         continue;
 637
 638                 /* Validate the Domain info */
 639                 count_target = pdomain->num_processors;
 640                 count = 1;
 641                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 642                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 643                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 645                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 646                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 647
 648                 for_each_possible_cpu(j) {
 649                         if (i == j)
 650                                 continue;
 651
 652                         match_pr = processors[j];
 653                         if (!match_pr)
 654                                 continue;
 655
 656                         match_pdomain = &(match_pr->performance->domain_info);
 657                         if (match_pdomain->domain != pdomain->domain)
 658                                 continue;
 659
 660                         /* Here i and j are in the same domain */
 661
 662                         if (match_pdomain->num_processors != count_target) {
 663                                 retval = -EINVAL;
 664                                 goto err_ret;
 665                         }
 666
 667                         if (pdomain->coord_type != match_pdomain->coord_type) {
 668                                 retval = -EINVAL;
 669                                 goto err_ret;
 670                         }
 671
 672                         cpu_set(j, covered_cpus);
 673                         cpu_set(j, pr->performance->shared_cpu_map);
 674                         count++;
 675                 }
 676
 677                 for_each_possible_cpu(j) {
 678                         if (i == j)
 679                                 continue;
 680
 681                         match_pr = processors[j];
 682                         if (!match_pr)
 683                                 continue;
 684
 685                         match_pdomain = &(match_pr->performance->domain_info);
 686                         if (match_pdomain->domain != pdomain->domain)
 687                                 continue;
 688
 689                         match_pr->performance->shared_type =
 690                                         pr->performance->shared_type;
 691                         match_pr->performance->shared_cpu_map =
 692                                 pr->performance->shared_cpu_map;
 693                 }
 694         }
 695
 696 err_ret:
 697         for_each_possible_cpu(i) {
 698                 pr = processors[i];
 699                 if (!pr || !pr->performance)
 700                         continue;
 701
 702                 /* Assume no coordination on any error parsing domain info */
 703                 if (retval) {
 704                         cpus_clear(pr->performance->shared_cpu_map);
 705                         cpu_set(i, pr->performance->shared_cpu_map);
 706                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 707                 }
 708                 pr->performance = NULL; /* Will be set for real in register */
 709         }
 710
 711         mutex_unlock(&performance_mutex);
 712         return retval;
 713 }
 714 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 715
 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
 724         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 725                 return -EINVAL;
 726
 727         mutex_lock(&performance_mutex);
 728
 729         pr = processors[cpu];
 730         if (!pr) {
 731                 mutex_unlock(&performance_mutex);
 732                 return -ENODEV;
 733         }
 734
 735         if (pr->performance) {
 736                 mutex_unlock(&performance_mutex);
 737                 return -EBUSY;
 738         }
 739
 740         WARN_ON(!performance);
 741
 742         pr->performance = performance;
 743
 744         if (acpi_processor_get_performance_info(pr)) {
 745                 pr->performance = NULL;
 746                 mutex_unlock(&performance_mutex);
 747                 return -EIO;
 748         }
 749
 750         acpi_cpufreq_add_file(pr);
 751
 752         mutex_unlock(&performance_mutex);
 753         return 0;
 754 }
 755
 756 EXPORT_SYMBOL(acpi_processor_register_performance);
 757
 758 void
 759 acpi_processor_unregister_performance(struct acpi_processor_performance
 760                                       *performance, unsigned int cpu)
 761 {
 762         struct acpi_processor *pr;
 763
 764
 765         mutex_lock(&performance_mutex);
 766
 767         pr = processors[cpu];
 768         if (!pr) {
 769                 mutex_unlock(&performance_mutex);
 770                 return;
 771         }
 772
 773         if (pr->performance)
 774                 kfree(pr->performance->states);
 775         pr->performance = NULL;
 776
 777         acpi_cpufreq_remove_file(pr);
 778
 779         mutex_unlock(&performance_mutex);
 780
 781         return;
 782 }
 783
 784 EXPORT_SYMBOL(acpi_processor_unregister_performance);