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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 /* Use cpufreq debug layer for _PPC changes. */
  54 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
  55                                                 "cpufreq-core", msg)
  56
  57 /*
  58  * _PPC support is implemented as a CPUfreq policy notifier:
  59  * This means each time a CPUfreq driver registered also with
  60  * the ACPI core is asked to change the speed policy, the maximum
  61  * value is adjusted so that it is within the platform limit.
  62  *
  63  * Also, when a new platform limit value is detected, the CPUfreq
  64  * policy is adjusted accordingly.
  65  */
  66
  67 static unsigned int ignore_ppc = 0;
  68 module_param(ignore_ppc, uint, 0644);
  69 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  70                  "limited by BIOS, this should help");
  71
  72 #define PPC_REGISTERED   1
  73 #define PPC_IN_USE       2
  74
  75 static int acpi_processor_ppc_status = 0;
  76
  77 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  78                                        unsigned long event, void *data)
  79 {
  80         struct cpufreq_policy *policy = data;
  81         struct acpi_processor *pr;
  82         unsigned int ppc = 0;
  83
  84         if (ignore_ppc)
  85                 return 0;
  86
  87         mutex_lock(&performance_mutex);
  88
  89         if (event != CPUFREQ_INCOMPATIBLE)
  90                 goto out;
  91
  92         pr = processors[policy->cpu];
  93         if (!pr || !pr->performance)
  94                 goto out;
  95
  96         ppc = (unsigned int)pr->performance_platform_limit;
  97
  98         if (ppc >= pr->performance->state_count)
  99                 goto out;
 100
 101         cpufreq_verify_within_limits(policy, 0,
 102                                      pr->performance->states[ppc].
 103                                      core_frequency * 1000);
 104
 105       out:
 106         mutex_unlock(&performance_mutex);
 107
 108         return 0;
 109 }
 110
 111 static struct notifier_block acpi_ppc_notifier_block = {
 112         .notifier_call = acpi_processor_ppc_notifier,
 113 };
 114
 115 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 116 {
 117         acpi_status status = 0;
 118         unsigned long ppc = 0;
 119
 120
 121         if (!pr)
 122                 return -EINVAL;
 123
 124         /*
 125          * _PPC indicates the maximum state currently supported by the platform
 126          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 127          */
 128         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 129
 130         if (status != AE_NOT_FOUND)
 131                 acpi_processor_ppc_status |= PPC_IN_USE;
 132
 133         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 134                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 135                 return -ENODEV;
 136         }
 137
 138         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 139                        (int)ppc, ppc ? "" : "not");
 140
 141         pr->performance_platform_limit = (int)ppc;
 142
 143         return 0;
 144 }
 145
 146 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 147 {
 148         int ret;
 149
 150         if (ignore_ppc)
 151                 return 0;
 152
 153         ret = acpi_processor_get_platform_limit(pr);
 154
 155         if (ret < 0)
 156                 return (ret);
 157         else
 158                 return cpufreq_update_policy(pr->id);
 159 }
 160
 161 void acpi_processor_ppc_init(void)
 162 {
 163         if (!cpufreq_register_notifier
 164             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 165                 acpi_processor_ppc_status |= PPC_REGISTERED;
 166         else
 167                 printk(KERN_DEBUG
 168                        "Warning: Processor Platform Limit not supported.\n");
 169 }
 170
 171 void acpi_processor_ppc_exit(void)
 172 {
 173         if (acpi_processor_ppc_status & PPC_REGISTERED)
 174                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 175                                             CPUFREQ_POLICY_NOTIFIER);
 176
 177         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 178 }
 179
 180 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 181 {
 182         int result = 0;
 183         acpi_status status = 0;
 184         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 185         union acpi_object *pct = NULL;
 186         union acpi_object obj = { 0 };
 187
 188
 189         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 190         if (ACPI_FAILURE(status)) {
 191                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 192                 return -ENODEV;
 193         }
 194
 195         pct = (union acpi_object *)buffer.pointer;
 196         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 197             || (pct->package.count != 2)) {
 198                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 199                 result = -EFAULT;
 200                 goto end;
 201         }
 202
 203         /*
 204          * control_register
 205          */
 206
 207         obj = pct->package.elements[0];
 208
 209         if ((obj.type != ACPI_TYPE_BUFFER)
 210             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 211             || (obj.buffer.pointer == NULL)) {
 212                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 213                 result = -EFAULT;
 214                 goto end;
 215         }
 216         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 217                sizeof(struct acpi_pct_register));
 218
 219         /*
 220          * status_register
 221          */
 222
 223         obj = pct->package.elements[1];
 224
 225         if ((obj.type != ACPI_TYPE_BUFFER)
 226             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 227             || (obj.buffer.pointer == NULL)) {
 228                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 229                 result = -EFAULT;
 230                 goto end;
 231         }
 232
 233         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 234                sizeof(struct acpi_pct_register));
 235
 236       end:
 237         kfree(buffer.pointer);
 238
 239         return result;
 240 }
 241
 242 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 243 {
 244         int result = 0;
 245         acpi_status status = AE_OK;
 246         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 247         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 248         struct acpi_buffer state = { 0, NULL };
 249         union acpi_object *pss = NULL;
 250         int i;
 251
 252
 253         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 254         if (ACPI_FAILURE(status)) {
 255                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 256                 return -ENODEV;
 257         }
 258
 259         pss = buffer.pointer;
 260         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 261                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 262                 result = -EFAULT;
 263                 goto end;
 264         }
 265
 266         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 267                           pss->package.count));
 268
 269         pr->performance->state_count = pss->package.count;
 270         pr->performance->states =
 271             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 272                     GFP_KERNEL);
 273         if (!pr->performance->states) {
 274                 result = -ENOMEM;
 275                 goto end;
 276         }
 277
 278         for (i = 0; i < pr->performance->state_count; i++) {
 279
 280                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 281
 282                 state.length = sizeof(struct acpi_processor_px);
 283                 state.pointer = px;
 284
 285                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 286
 287                 status = acpi_extract_package(&(pss->package.elements[i]),
 288                                               &format, &state);
 289                 if (ACPI_FAILURE(status)) {
 290                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 291                         result = -EFAULT;
 292                         kfree(pr->performance->states);
 293                         goto end;
 294                 }
 295
 296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 297                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 298                                   i,
 299                                   (u32) px->core_frequency,
 300                                   (u32) px->power,
 301                                   (u32) px->transition_latency,
 302                                   (u32) px->bus_master_latency,
 303                                   (u32) px->control, (u32) px->status));
 304
 305                 if (!px->core_frequency) {
 306                         printk(KERN_ERR PREFIX
 307                                     "Invalid _PSS data: freq is zero\n");
 308                         result = -EFAULT;
 309                         kfree(pr->performance->states);
 310                         goto end;
 311                 }
 312         }
 313
 314       end:
 315         kfree(buffer.pointer);
 316
 317         return result;
 318 }
 319
 320 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 321 {
 322         int result = 0;
 323         acpi_status status = AE_OK;
 324         acpi_handle handle = NULL;
 325
 326
 327         if (!pr || !pr->performance || !pr->handle)
 328                 return -EINVAL;
 329
 330         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 331         if (ACPI_FAILURE(status)) {
 332                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 333                                   "ACPI-based processor performance control unavailable\n"));
 334                 return -ENODEV;
 335         }
 336
 337         result = acpi_processor_get_performance_control(pr);
 338         if (result)
 339                 return result;
 340
 341         result = acpi_processor_get_performance_states(pr);
 342         if (result)
 343                 return result;
 344
 345         return 0;
 346 }
 347
 348 int acpi_processor_notify_smm(struct module *calling_module)
 349 {
 350         acpi_status status;
 351         static int is_done = 0;
 352
 353
 354         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 355                 return -EBUSY;
 356
 357         if (!try_module_get(calling_module))
 358                 return -EINVAL;
 359
 360         /* is_done is set to negative if an error occured,
 361          * and to postitive if _no_ error occured, but SMM
 362          * was already notified. This avoids double notification
 363          * which might lead to unexpected results...
 364          */
 365         if (is_done > 0) {
 366                 module_put(calling_module);
 367                 return 0;
 368         } else if (is_done < 0) {
 369                 module_put(calling_module);
 370                 return is_done;
 371         }
 372
 373         is_done = -EIO;
 374
 375         /* Can't write pstate_control to smi_command if either value is zero */
 376         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 377                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 378                 module_put(calling_module);
 379                 return 0;
 380         }
 381
 382         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 383                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 384                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 385
 386         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 387                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 388         if (ACPI_FAILURE(status)) {
 389                 ACPI_EXCEPTION((AE_INFO, status,
 390                                 "Failed to write pstate_control [0x%x] to "
 391                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 392                                 acpi_gbl_FADT.smi_command));
 393                 module_put(calling_module);
 394                 return status;
 395         }
 396
 397         /* Success. If there's no _PPC, we need to fear nothing, so
 398          * we can allow the cpufreq driver to be rmmod'ed. */
 399         is_done = 1;
 400
 401         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 402                 module_put(calling_module);
 403
 404         return 0;
 405 }
 406
 407 EXPORT_SYMBOL(acpi_processor_notify_smm);
 408
 409 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 410 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 411
 412 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 413 static struct file_operations acpi_processor_perf_fops = {
 414         .open = acpi_processor_perf_open_fs,
 415         .read = seq_read,
 416         .llseek = seq_lseek,
 417         .release = single_release,
 418 };
 419
 420 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 421 {
 422         struct acpi_processor *pr = seq->private;
 423         int i;
 424
 425
 426         if (!pr)
 427                 goto end;
 428
 429         if (!pr->performance) {
 430                 seq_puts(seq, "<not supported>\n");
 431                 goto end;
 432         }
 433
 434         seq_printf(seq, "state count:             %d\n"
 435                    "active state:            P%d\n",
 436                    pr->performance->state_count, pr->performance->state);
 437
 438         seq_puts(seq, "states:\n");
 439         for (i = 0; i < pr->performance->state_count; i++)
 440                 seq_printf(seq,
 441                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 442                            (i == pr->performance->state ? '*' : ' '), i,
 443                            (u32) pr->performance->states[i].core_frequency,
 444                            (u32) pr->performance->states[i].power,
 445                            (u32) pr->performance->states[i].transition_latency);
 446
 447       end:
 448         return 0;
 449 }
 450
 451 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 452 {
 453         return single_open(file, acpi_processor_perf_seq_show,
 454                            PDE(inode)->data);
 455 }
 456
 457 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 458 {
 459         struct proc_dir_entry *entry = NULL;
 460         struct acpi_device *device = NULL;
 461
 462
 463         if (acpi_bus_get_device(pr->handle, &device))
 464                 return;
 465
 466         /* add file 'performance' [R/W] */
 467         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 468                                   S_IFREG | S_IRUGO,
 469                                   acpi_device_dir(device));
 470         if (entry){
 471                 entry->proc_fops = &acpi_processor_perf_fops;
 472                 entry->data = acpi_driver_data(device);
 473                 entry->owner = THIS_MODULE;
 474         }
 475         return;
 476 }
 477
 478 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 479 {
 480         struct acpi_device *device = NULL;
 481
 482
 483         if (acpi_bus_get_device(pr->handle, &device))
 484                 return;
 485
 486         /* remove file 'performance' */
 487         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 488                           acpi_device_dir(device));
 489
 490         return;
 491 }
 492
 493 #else
 494 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 495 {
 496         return;
 497 }
 498 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 499 {
 500         return;
 501 }
 502 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 503
 504 static int acpi_processor_get_psd(struct acpi_processor *pr)
 505 {
 506         int result = 0;
 507         acpi_status status = AE_OK;
 508         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 509         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 510         struct acpi_buffer state = {0, NULL};
 511         union acpi_object  *psd = NULL;
 512         struct acpi_psd_package *pdomain;
 513
 514         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 515         if (ACPI_FAILURE(status)) {
 516                 return -ENODEV;
 517         }
 518
 519         psd = buffer.pointer;
 520         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 521                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 522                 result = -EFAULT;
 523                 goto end;
 524         }
 525
 526         if (psd->package.count != 1) {
 527                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 528                 result = -EFAULT;
 529                 goto end;
 530         }
 531
 532         pdomain = &(pr->performance->domain_info);
 533
 534         state.length = sizeof(struct acpi_psd_package);
 535         state.pointer = pdomain;
 536
 537         status = acpi_extract_package(&(psd->package.elements[0]),
 538                 &format, &state);
 539         if (ACPI_FAILURE(status)) {
 540                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 541                 result = -EFAULT;
 542                 goto end;
 543         }
 544
 545         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 546                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 547                 result = -EFAULT;
 548                 goto end;
 549         }
 550
 551         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 552                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 553                 result = -EFAULT;
 554                 goto end;
 555         }
 556
 557 end:
 558         kfree(buffer.pointer);
 559         return result;
 560 }
 561
 562 int acpi_processor_preregister_performance(
 563                 struct acpi_processor_performance *performance)
 564 {
 565         int count, count_target;
 566         int retval = 0;
 567         unsigned int i, j;
 568         cpumask_t covered_cpus;
 569         struct acpi_processor *pr;
 570         struct acpi_psd_package *pdomain;
 571         struct acpi_processor *match_pr;
 572         struct acpi_psd_package *match_pdomain;
 573
 574         mutex_lock(&performance_mutex);
 575
 576         retval = 0;
 577
 578         /* Call _PSD for all CPUs */
 579         for_each_possible_cpu(i) {
 580                 pr = processors[i];
 581                 if (!pr) {
 582                         /* Look only at processors in ACPI namespace */
 583                         continue;
 584                 }
 585
 586                 if (pr->performance) {
 587                         retval = -EBUSY;
 588                         continue;
 589                 }
 590
 591                 if (!performance || !percpu_ptr(performance, i)) {
 592                         retval = -EINVAL;
 593                         continue;
 594                 }
 595
 596                 pr->performance = percpu_ptr(performance, i);
 597                 cpu_set(i, pr->performance->shared_cpu_map);
 598                 if (acpi_processor_get_psd(pr)) {
 599                         retval = -EINVAL;
 600                         continue;
 601                 }
 602         }
 603         if (retval)
 604                 goto err_ret;
 605
 606         /*
 607          * Now that we have _PSD data from all CPUs, lets setup P-state
 608          * domain info.
 609          */
 610         for_each_possible_cpu(i) {
 611                 pr = processors[i];
 612                 if (!pr)
 613                         continue;
 614
 615                 /* Basic validity check for domain info */
 616                 pdomain = &(pr->performance->domain_info);
 617                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 618                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 619                         retval = -EINVAL;
 620                         goto err_ret;
 621                 }
 622                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 623                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 624                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 625                         retval = -EINVAL;
 626                         goto err_ret;
 627                 }
 628         }
 629
 630         cpus_clear(covered_cpus);
 631         for_each_possible_cpu(i) {
 632                 pr = processors[i];
 633                 if (!pr)
 634                         continue;
 635
 636                 if (cpu_isset(i, covered_cpus))
 637                         continue;
 638
 639                 pdomain = &(pr->performance->domain_info);
 640                 cpu_set(i, pr->performance->shared_cpu_map);
 641                 cpu_set(i, covered_cpus);
 642                 if (pdomain->num_processors <= 1)
 643                         continue;
 644
 645                 /* Validate the Domain info */
 646                 count_target = pdomain->num_processors;
 647                 count = 1;
 648                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 649                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 650                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 651                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 652                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 653                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 654
 655                 for_each_possible_cpu(j) {
 656                         if (i == j)
 657                                 continue;
 658
 659                         match_pr = processors[j];
 660                         if (!match_pr)
 661                                 continue;
 662
 663                         match_pdomain = &(match_pr->performance->domain_info);
 664                         if (match_pdomain->domain != pdomain->domain)
 665                                 continue;
 666
 667                         /* Here i and j are in the same domain */
 668
 669                         if (match_pdomain->num_processors != count_target) {
 670                                 retval = -EINVAL;
 671                                 goto err_ret;
 672                         }
 673
 674                         if (pdomain->coord_type != match_pdomain->coord_type) {
 675                                 retval = -EINVAL;
 676                                 goto err_ret;
 677                         }
 678
 679                         cpu_set(j, covered_cpus);
 680                         cpu_set(j, pr->performance->shared_cpu_map);
 681                         count++;
 682                 }
 683
 684                 for_each_possible_cpu(j) {
 685                         if (i == j)
 686                                 continue;
 687
 688                         match_pr = processors[j];
 689                         if (!match_pr)
 690                                 continue;
 691
 692                         match_pdomain = &(match_pr->performance->domain_info);
 693                         if (match_pdomain->domain != pdomain->domain)
 694                                 continue;
 695
 696                         match_pr->performance->shared_type =
 697                                         pr->performance->shared_type;
 698                         match_pr->performance->shared_cpu_map =
 699                                 pr->performance->shared_cpu_map;
 700                 }
 701         }
 702
 703 err_ret:
 704         for_each_possible_cpu(i) {
 705                 pr = processors[i];
 706                 if (!pr || !pr->performance)
 707                         continue;
 708
 709                 /* Assume no coordination on any error parsing domain info */
 710                 if (retval) {
 711                         cpus_clear(pr->performance->shared_cpu_map);
 712                         cpu_set(i, pr->performance->shared_cpu_map);
 713                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 714                 }
 715                 pr->performance = NULL; /* Will be set for real in register */
 716         }
 717
 718         mutex_unlock(&performance_mutex);
 719         return retval;
 720 }
 721 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 722
 723
 724 int
 725 acpi_processor_register_performance(struct acpi_processor_performance
 726                                     *performance, unsigned int cpu)
 727 {
 728         struct acpi_processor *pr;
 729
 730
 731         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 732                 return -EINVAL;
 733
 734         mutex_lock(&performance_mutex);
 735
 736         pr = processors[cpu];
 737         if (!pr) {
 738                 mutex_unlock(&performance_mutex);
 739                 return -ENODEV;
 740         }
 741
 742         if (pr->performance) {
 743                 mutex_unlock(&performance_mutex);
 744                 return -EBUSY;
 745         }
 746
 747         WARN_ON(!performance);
 748
 749         pr->performance = performance;
 750
 751         if (acpi_processor_get_performance_info(pr)) {
 752                 pr->performance = NULL;
 753                 mutex_unlock(&performance_mutex);
 754                 return -EIO;
 755         }
 756
 757         acpi_cpufreq_add_file(pr);
 758
 759         mutex_unlock(&performance_mutex);
 760         return 0;
 761 }
 762
 763 EXPORT_SYMBOL(acpi_processor_register_performance);
 764
 765 void
 766 acpi_processor_unregister_performance(struct acpi_processor_performance
 767                                       *performance, unsigned int cpu)
 768 {
 769         struct acpi_processor *pr;
 770
 771
 772         mutex_lock(&performance_mutex);
 773
 774         pr = processors[cpu];
 775         if (!pr) {
 776                 mutex_unlock(&performance_mutex);
 777                 return;
 778         }
 779
 780         if (pr->performance)
 781                 kfree(pr->performance->states);
 782         pr->performance = NULL;
 783
 784         acpi_cpufreq_remove_file(pr);
 785
 786         mutex_unlock(&performance_mutex);
 787
 788         return;
 789 }
 790
 791 EXPORT_SYMBOL(acpi_processor_unregister_performance);