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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_DRIVER_NAME      "ACPI Processor Driver"
  48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  49 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  50 ACPI_MODULE_NAME("acpi_processor")
  51
  52 static DEFINE_MUTEX(performance_mutex);
  53
  54 /*
  55  * _PPC support is implemented as a CPUfreq policy notifier:
  56  * This means each time a CPUfreq driver registered also with
  57  * the ACPI core is asked to change the speed policy, the maximum
  58  * value is adjusted so that it is within the platform limit.
  59  *
  60  * Also, when a new platform limit value is detected, the CPUfreq
  61  * policy is adjusted accordingly.
  62  */
  63
  64 #define PPC_REGISTERED   1
  65 #define PPC_IN_USE       2
  66
  67 static int acpi_processor_ppc_status = 0;
  68
  69 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  70                                        unsigned long event, void *data)
  71 {
  72         struct cpufreq_policy *policy = data;
  73         struct acpi_processor *pr;
  74         unsigned int ppc = 0;
  75
  76         mutex_lock(&performance_mutex);
  77
  78         if (event != CPUFREQ_INCOMPATIBLE)
  79                 goto out;
  80
  81         pr = processors[policy->cpu];
  82         if (!pr || !pr->performance)
  83                 goto out;
  84
  85         ppc = (unsigned int)pr->performance_platform_limit;
  86         if (!ppc)
  87                 goto out;
  88
  89         if (ppc > pr->performance->state_count)
  90                 goto out;
  91
  92         cpufreq_verify_within_limits(policy, 0,
  93                                      pr->performance->states[ppc].
  94                                      core_frequency * 1000);
  95
  96       out:
  97         mutex_unlock(&performance_mutex);
  98
  99         return 0;
 100 }
 101
 102 static struct notifier_block acpi_ppc_notifier_block = {
 103         .notifier_call = acpi_processor_ppc_notifier,
 104 };
 105
 106 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 107 {
 108         acpi_status status = 0;
 109         unsigned long ppc = 0;
 110
 111
 112         if (!pr)
 113                 return -EINVAL;
 114
 115         /*
 116          * _PPC indicates the maximum state currently supported by the platform
 117          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 118          */
 119         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 120
 121         if (status != AE_NOT_FOUND)
 122                 acpi_processor_ppc_status |= PPC_IN_USE;
 123
 124         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 125                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 126                 return -ENODEV;
 127         }
 128
 129         pr->performance_platform_limit = (int)ppc;
 130
 131         return 0;
 132 }
 133
 134 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 135 {
 136         int ret = acpi_processor_get_platform_limit(pr);
 137         if (ret < 0)
 138                 return (ret);
 139         else
 140                 return cpufreq_update_policy(pr->id);
 141 }
 142
 143 void acpi_processor_ppc_init(void)
 144 {
 145         if (!cpufreq_register_notifier
 146             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 147                 acpi_processor_ppc_status |= PPC_REGISTERED;
 148         else
 149                 printk(KERN_DEBUG
 150                        "Warning: Processor Platform Limit not supported.\n");
 151 }
 152
 153 void acpi_processor_ppc_exit(void)
 154 {
 155         if (acpi_processor_ppc_status & PPC_REGISTERED)
 156                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 157                                             CPUFREQ_POLICY_NOTIFIER);
 158
 159         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 160 }
 161
 162 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 163 {
 164         int result = 0;
 165         acpi_status status = 0;
 166         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 167         union acpi_object *pct = NULL;
 168         union acpi_object obj = { 0 };
 169
 170
 171         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 172         if (ACPI_FAILURE(status)) {
 173                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 174                 return -ENODEV;
 175         }
 176
 177         pct = (union acpi_object *)buffer.pointer;
 178         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 179             || (pct->package.count != 2)) {
 180                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 181                 result = -EFAULT;
 182                 goto end;
 183         }
 184
 185         /*
 186          * control_register
 187          */
 188
 189         obj = pct->package.elements[0];
 190
 191         if ((obj.type != ACPI_TYPE_BUFFER)
 192             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 193             || (obj.buffer.pointer == NULL)) {
 194                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 195                 result = -EFAULT;
 196                 goto end;
 197         }
 198         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 199                sizeof(struct acpi_pct_register));
 200
 201         /*
 202          * status_register
 203          */
 204
 205         obj = pct->package.elements[1];
 206
 207         if ((obj.type != ACPI_TYPE_BUFFER)
 208             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 209             || (obj.buffer.pointer == NULL)) {
 210                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 211                 result = -EFAULT;
 212                 goto end;
 213         }
 214
 215         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 216                sizeof(struct acpi_pct_register));
 217
 218       end:
 219         kfree(buffer.pointer);
 220
 221         return result;
 222 }
 223
 224 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 225 {
 226         int result = 0;
 227         acpi_status status = AE_OK;
 228         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 229         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 230         struct acpi_buffer state = { 0, NULL };
 231         union acpi_object *pss = NULL;
 232         int i;
 233
 234
 235         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 236         if (ACPI_FAILURE(status)) {
 237                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 238                 return -ENODEV;
 239         }
 240
 241         pss = (union acpi_object *)buffer.pointer;
 242         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 243                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 244                 result = -EFAULT;
 245                 goto end;
 246         }
 247
 248         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 249                           pss->package.count));
 250
 251         pr->performance->state_count = pss->package.count;
 252         pr->performance->states =
 253             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 254                     GFP_KERNEL);
 255         if (!pr->performance->states) {
 256                 result = -ENOMEM;
 257                 goto end;
 258         }
 259
 260         for (i = 0; i < pr->performance->state_count; i++) {
 261
 262                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 263
 264                 state.length = sizeof(struct acpi_processor_px);
 265                 state.pointer = px;
 266
 267                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 268
 269                 status = acpi_extract_package(&(pss->package.elements[i]),
 270                                               &format, &state);
 271                 if (ACPI_FAILURE(status)) {
 272                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 273                         result = -EFAULT;
 274                         kfree(pr->performance->states);
 275                         goto end;
 276                 }
 277
 278                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 279                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 280                                   i,
 281                                   (u32) px->core_frequency,
 282                                   (u32) px->power,
 283                                   (u32) px->transition_latency,
 284                                   (u32) px->bus_master_latency,
 285                                   (u32) px->control, (u32) px->status));
 286
 287                 if (!px->core_frequency) {
 288                         printk(KERN_ERR PREFIX
 289                                     "Invalid _PSS data: freq is zero\n");
 290                         result = -EFAULT;
 291                         kfree(pr->performance->states);
 292                         goto end;
 293                 }
 294         }
 295
 296       end:
 297         kfree(buffer.pointer);
 298
 299         return result;
 300 }
 301
 302 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 303 {
 304         int result = 0;
 305         acpi_status status = AE_OK;
 306         acpi_handle handle = NULL;
 307
 308
 309         if (!pr || !pr->performance || !pr->handle)
 310                 return -EINVAL;
 311
 312         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 313         if (ACPI_FAILURE(status)) {
 314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 315                                   "ACPI-based processor performance control unavailable\n"));
 316                 return -ENODEV;
 317         }
 318
 319         result = acpi_processor_get_performance_control(pr);
 320         if (result)
 321                 return result;
 322
 323         result = acpi_processor_get_performance_states(pr);
 324         if (result)
 325                 return result;
 326
 327         result = acpi_processor_get_platform_limit(pr);
 328         if (result)
 329                 return result;
 330
 331         return 0;
 332 }
 333
 334 int acpi_processor_notify_smm(struct module *calling_module)
 335 {
 336         acpi_status status;
 337         static int is_done = 0;
 338
 339
 340         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 341                 return -EBUSY;
 342
 343         if (!try_module_get(calling_module))
 344                 return -EINVAL;
 345
 346         /* is_done is set to negative if an error occured,
 347          * and to postitive if _no_ error occured, but SMM
 348          * was already notified. This avoids double notification
 349          * which might lead to unexpected results...
 350          */
 351         if (is_done > 0) {
 352                 module_put(calling_module);
 353                 return 0;
 354         } else if (is_done < 0) {
 355                 module_put(calling_module);
 356                 return is_done;
 357         }
 358
 359         is_done = -EIO;
 360
 361         /* Can't write pstate_cnt to smi_cmd if either value is zero */
 362         if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
 363                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
 364                 module_put(calling_module);
 365                 return 0;
 366         }
 367
 368         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 369                           "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
 370                           acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
 371
 372         /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
 373          * it anyway, so we need to support it... */
 374         if (acpi_fadt_is_v1) {
 375                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 376                                   "Using v1.0 FADT reserved value for pstate_cnt\n"));
 377         }
 378
 379         status = acpi_os_write_port(acpi_fadt.smi_cmd,
 380                                     (u32) acpi_fadt.pstate_cnt, 8);
 381         if (ACPI_FAILURE(status)) {
 382                 ACPI_EXCEPTION((AE_INFO, status,
 383                                 "Failed to write pstate_cnt [0x%x] to "
 384                                 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
 385                                 acpi_fadt.smi_cmd));
 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 = (struct acpi_processor *)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 ssize_t
 451 acpi_processor_write_performance(struct file *file,
 452                                  const char __user * buffer,
 453                                  size_t count, loff_t * data)
 454 {
 455         int result = 0;
 456         struct seq_file *m = (struct seq_file *)file->private_data;
 457         struct acpi_processor *pr = (struct acpi_processor *)m->private;
 458         struct acpi_processor_performance *perf;
 459         char state_string[12] = { '\0' };
 460         unsigned int new_state = 0;
 461         struct cpufreq_policy policy;
 462
 463
 464         if (!pr || (count > sizeof(state_string) - 1))
 465                 return -EINVAL;
 466
 467         perf = pr->performance;
 468         if (!perf)
 469                 return -EINVAL;
 470
 471         if (copy_from_user(state_string, buffer, count))
 472                 return -EFAULT;
 473
 474         state_string[count] = '\0';
 475         new_state = simple_strtoul(state_string, NULL, 0);
 476
 477         if (new_state >= perf->state_count)
 478                 return -EINVAL;
 479
 480         cpufreq_get_policy(&policy, pr->id);
 481
 482         policy.cpu = pr->id;
 483         policy.min = perf->states[new_state].core_frequency * 1000;
 484         policy.max = perf->states[new_state].core_frequency * 1000;
 485
 486         result = cpufreq_set_policy(&policy);
 487         if (result)
 488                 return result;
 489
 490         return count;
 491 }
 492
 493 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 494 {
 495         struct proc_dir_entry *entry = NULL;
 496         struct acpi_device *device = NULL;
 497
 498
 499         if (acpi_bus_get_device(pr->handle, &device))
 500                 return;
 501
 502         /* add file 'performance' [R/W] */
 503         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 504                                   S_IFREG | S_IRUGO | S_IWUSR,
 505                                   acpi_device_dir(device));
 506         if (entry){
 507                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
 508                 entry->proc_fops = &acpi_processor_perf_fops;
 509                 entry->data = acpi_driver_data(device);
 510                 entry->owner = THIS_MODULE;
 511         }
 512         return;
 513 }
 514
 515 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 516 {
 517         struct acpi_device *device = NULL;
 518
 519
 520         if (acpi_bus_get_device(pr->handle, &device))
 521                 return;
 522
 523         /* remove file 'performance' */
 524         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 525                           acpi_device_dir(device));
 526
 527         return;
 528 }
 529
 530 #else
 531 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 532 {
 533         return;
 534 }
 535 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 536 {
 537         return;
 538 }
 539 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 540
 541 static int acpi_processor_get_psd(struct acpi_processor *pr)
 542 {
 543         int result = 0;
 544         acpi_status status = AE_OK;
 545         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 546         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 547         struct acpi_buffer state = {0, NULL};
 548         union acpi_object  *psd = NULL;
 549         struct acpi_psd_package *pdomain;
 550
 551         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 552         if (ACPI_FAILURE(status)) {
 553                 return -ENODEV;
 554         }
 555
 556         psd = (union acpi_object *) buffer.pointer;
 557         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 558                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 559                 result = -EFAULT;
 560                 goto end;
 561         }
 562
 563         if (psd->package.count != 1) {
 564                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 565                 result = -EFAULT;
 566                 goto end;
 567         }
 568
 569         pdomain = &(pr->performance->domain_info);
 570
 571         state.length = sizeof(struct acpi_psd_package);
 572         state.pointer = pdomain;
 573
 574         status = acpi_extract_package(&(psd->package.elements[0]),
 575                 &format, &state);
 576         if (ACPI_FAILURE(status)) {
 577                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 578                 result = -EFAULT;
 579                 goto end;
 580         }
 581
 582         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 583                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 584                 result = -EFAULT;
 585                 goto end;
 586         }
 587
 588         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 589                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 590                 result = -EFAULT;
 591                 goto end;
 592         }
 593
 594 end:
 595         kfree(buffer.pointer);
 596         return result;
 597 }
 598
 599 int acpi_processor_preregister_performance(
 600                 struct acpi_processor_performance **performance)
 601 {
 602         int count, count_target;
 603         int retval = 0;
 604         unsigned int i, j;
 605         cpumask_t covered_cpus;
 606         struct acpi_processor *pr;
 607         struct acpi_psd_package *pdomain;
 608         struct acpi_processor *match_pr;
 609         struct acpi_psd_package *match_pdomain;
 610
 611         mutex_lock(&performance_mutex);
 612
 613         retval = 0;
 614
 615         /* Call _PSD for all CPUs */
 616         for_each_possible_cpu(i) {
 617                 pr = processors[i];
 618                 if (!pr) {
 619                         /* Look only at processors in ACPI namespace */
 620                         continue;
 621                 }
 622
 623                 if (pr->performance) {
 624                         retval = -EBUSY;
 625                         continue;
 626                 }
 627
 628                 if (!performance || !performance[i]) {
 629                         retval = -EINVAL;
 630                         continue;
 631                 }
 632
 633                 pr->performance = performance[i];
 634                 cpu_set(i, pr->performance->shared_cpu_map);
 635                 if (acpi_processor_get_psd(pr)) {
 636                         retval = -EINVAL;
 637                         continue;
 638                 }
 639         }
 640         if (retval)
 641                 goto err_ret;
 642
 643         /*
 644          * Now that we have _PSD data from all CPUs, lets setup P-state
 645          * domain info.
 646          */
 647         for_each_possible_cpu(i) {
 648                 pr = processors[i];
 649                 if (!pr)
 650                         continue;
 651
 652                 /* Basic validity check for domain info */
 653                 pdomain = &(pr->performance->domain_info);
 654                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 655                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 656                         retval = -EINVAL;
 657                         goto err_ret;
 658                 }
 659                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 660                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 661                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 662                         retval = -EINVAL;
 663                         goto err_ret;
 664                 }
 665         }
 666
 667         cpus_clear(covered_cpus);
 668         for_each_possible_cpu(i) {
 669                 pr = processors[i];
 670                 if (!pr)
 671                         continue;
 672
 673                 if (cpu_isset(i, covered_cpus))
 674                         continue;
 675
 676                 pdomain = &(pr->performance->domain_info);
 677                 cpu_set(i, pr->performance->shared_cpu_map);
 678                 cpu_set(i, covered_cpus);
 679                 if (pdomain->num_processors <= 1)
 680                         continue;
 681
 682                 /* Validate the Domain info */
 683                 count_target = pdomain->num_processors;
 684                 count = 1;
 685                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 686                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 687                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 688                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 689                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 690                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 691
 692                 for_each_possible_cpu(j) {
 693                         if (i == j)
 694                                 continue;
 695
 696                         match_pr = processors[j];
 697                         if (!match_pr)
 698                                 continue;
 699
 700                         match_pdomain = &(match_pr->performance->domain_info);
 701                         if (match_pdomain->domain != pdomain->domain)
 702                                 continue;
 703
 704                         /* Here i and j are in the same domain */
 705
 706                         if (match_pdomain->num_processors != count_target) {
 707                                 retval = -EINVAL;
 708                                 goto err_ret;
 709                         }
 710
 711                         if (pdomain->coord_type != match_pdomain->coord_type) {
 712                                 retval = -EINVAL;
 713                                 goto err_ret;
 714                         }
 715
 716                         cpu_set(j, covered_cpus);
 717                         cpu_set(j, pr->performance->shared_cpu_map);
 718                         count++;
 719                 }
 720
 721                 for_each_possible_cpu(j) {
 722                         if (i == j)
 723                                 continue;
 724
 725                         match_pr = processors[j];
 726                         if (!match_pr)
 727                                 continue;
 728
 729                         match_pdomain = &(match_pr->performance->domain_info);
 730                         if (match_pdomain->domain != pdomain->domain)
 731                                 continue;
 732
 733                         match_pr->performance->shared_type =
 734                                         pr->performance->shared_type;
 735                         match_pr->performance->shared_cpu_map =
 736                                 pr->performance->shared_cpu_map;
 737                 }
 738         }
 739
 740 err_ret:
 741         if (retval) {
 742                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n"));
 743         }
 744
 745         for_each_possible_cpu(i) {
 746                 pr = processors[i];
 747                 if (!pr || !pr->performance)
 748                         continue;
 749
 750                 /* Assume no coordination on any error parsing domain info */
 751                 if (retval) {
 752                         cpus_clear(pr->performance->shared_cpu_map);
 753                         cpu_set(i, pr->performance->shared_cpu_map);
 754                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 755                 }
 756                 pr->performance = NULL; /* Will be set for real in register */
 757         }
 758
 759         mutex_unlock(&performance_mutex);
 760         return retval;
 761 }
 762 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 763
 764
 765 int
 766 acpi_processor_register_performance(struct acpi_processor_performance
 767                                     *performance, unsigned int cpu)
 768 {
 769         struct acpi_processor *pr;
 770
 771
 772         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 773                 return -EINVAL;
 774
 775         mutex_lock(&performance_mutex);
 776
 777         pr = processors[cpu];
 778         if (!pr) {
 779                 mutex_unlock(&performance_mutex);
 780                 return -ENODEV;
 781         }
 782
 783         if (pr->performance) {
 784                 mutex_unlock(&performance_mutex);
 785                 return -EBUSY;
 786         }
 787
 788         WARN_ON(!performance);
 789
 790         pr->performance = performance;
 791
 792         if (acpi_processor_get_performance_info(pr)) {
 793                 pr->performance = NULL;
 794                 mutex_unlock(&performance_mutex);
 795                 return -EIO;
 796         }
 797
 798         acpi_cpufreq_add_file(pr);
 799
 800         mutex_unlock(&performance_mutex);
 801         return 0;
 802 }
 803
 804 EXPORT_SYMBOL(acpi_processor_register_performance);
 805
 806 void
 807 acpi_processor_unregister_performance(struct acpi_processor_performance
 808                                       *performance, unsigned int cpu)
 809 {
 810         struct acpi_processor *pr;
 811
 812
 813         mutex_lock(&performance_mutex);
 814
 815         pr = processors[cpu];
 816         if (!pr) {
 817                 mutex_unlock(&performance_mutex);
 818                 return;
 819         }
 820
 821         if (pr->performance)
 822                 kfree(pr->performance->states);
 823         pr->performance = NULL;
 824
 825         acpi_cpufreq_remove_file(pr);
 826
 827         mutex_unlock(&performance_mutex);
 828
 829         return;
 830 }
 831
 832 EXPORT_SYMBOL(acpi_processor_unregister_performance);