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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
  87         if (ppc >= pr->performance->state_count)
  88                 goto out;
  89
  90         cpufreq_verify_within_limits(policy, 0,
  91                                      pr->performance->states[ppc].
  92                                      core_frequency * 1000);
  93
  94       out:
  95         mutex_unlock(&performance_mutex);
  96
  97         return 0;
  98 }
  99
 100 static struct notifier_block acpi_ppc_notifier_block = {
 101         .notifier_call = acpi_processor_ppc_notifier,
 102 };
 103
 104 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 105 {
 106         acpi_status status = 0;
 107         unsigned long ppc = 0;
 108
 109
 110         if (!pr)
 111                 return -EINVAL;
 112
 113         /*
 114          * _PPC indicates the maximum state currently supported by the platform
 115          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 116          */
 117         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 118
 119         if (status != AE_NOT_FOUND)
 120                 acpi_processor_ppc_status |= PPC_IN_USE;
 121
 122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 123                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 124                 return -ENODEV;
 125         }
 126
 127         pr->performance_platform_limit = (int)ppc;
 128
 129         return 0;
 130 }
 131
 132 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 133 {
 134         int ret = acpi_processor_get_platform_limit(pr);
 135         if (ret < 0)
 136                 return (ret);
 137         else
 138                 return cpufreq_update_policy(pr->id);
 139 }
 140
 141 void acpi_processor_ppc_init(void)
 142 {
 143         if (!cpufreq_register_notifier
 144             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 145                 acpi_processor_ppc_status |= PPC_REGISTERED;
 146         else
 147                 printk(KERN_DEBUG
 148                        "Warning: Processor Platform Limit not supported.\n");
 149 }
 150
 151 void acpi_processor_ppc_exit(void)
 152 {
 153         if (acpi_processor_ppc_status & PPC_REGISTERED)
 154                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 155                                             CPUFREQ_POLICY_NOTIFIER);
 156
 157         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 158 }
 159
 160 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 161 {
 162         int result = 0;
 163         acpi_status status = 0;
 164         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 165         union acpi_object *pct = NULL;
 166         union acpi_object obj = { 0 };
 167
 168
 169         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 170         if (ACPI_FAILURE(status)) {
 171                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 172                 return -ENODEV;
 173         }
 174
 175         pct = (union acpi_object *)buffer.pointer;
 176         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 177             || (pct->package.count != 2)) {
 178                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 179                 result = -EFAULT;
 180                 goto end;
 181         }
 182
 183         /*
 184          * control_register
 185          */
 186
 187         obj = pct->package.elements[0];
 188
 189         if ((obj.type != ACPI_TYPE_BUFFER)
 190             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 191             || (obj.buffer.pointer == NULL)) {
 192                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 193                 result = -EFAULT;
 194                 goto end;
 195         }
 196         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 197                sizeof(struct acpi_pct_register));
 198
 199         /*
 200          * status_register
 201          */
 202
 203         obj = pct->package.elements[1];
 204
 205         if ((obj.type != ACPI_TYPE_BUFFER)
 206             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 207             || (obj.buffer.pointer == NULL)) {
 208                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 209                 result = -EFAULT;
 210                 goto end;
 211         }
 212
 213         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 214                sizeof(struct acpi_pct_register));
 215
 216       end:
 217         kfree(buffer.pointer);
 218
 219         return result;
 220 }
 221
 222 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 223 {
 224         int result = 0;
 225         acpi_status status = AE_OK;
 226         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 227         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 228         struct acpi_buffer state = { 0, NULL };
 229         union acpi_object *pss = NULL;
 230         int i;
 231
 232
 233         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 234         if (ACPI_FAILURE(status)) {
 235                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 236                 return -ENODEV;
 237         }
 238
 239         pss = buffer.pointer;
 240         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 241                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 242                 result = -EFAULT;
 243                 goto end;
 244         }
 245
 246         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 247                           pss->package.count));
 248
 249         pr->performance->state_count = pss->package.count;
 250         pr->performance->states =
 251             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 252                     GFP_KERNEL);
 253         if (!pr->performance->states) {
 254                 result = -ENOMEM;
 255                 goto end;
 256         }
 257
 258         for (i = 0; i < pr->performance->state_count; i++) {
 259
 260                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 261
 262                 state.length = sizeof(struct acpi_processor_px);
 263                 state.pointer = px;
 264
 265                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 266
 267                 status = acpi_extract_package(&(pss->package.elements[i]),
 268                                               &format, &state);
 269                 if (ACPI_FAILURE(status)) {
 270                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 271                         result = -EFAULT;
 272                         kfree(pr->performance->states);
 273                         goto end;
 274                 }
 275
 276                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 277                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 278                                   i,
 279                                   (u32) px->core_frequency,
 280                                   (u32) px->power,
 281                                   (u32) px->transition_latency,
 282                                   (u32) px->bus_master_latency,
 283                                   (u32) px->control, (u32) px->status));
 284
 285                 if (!px->core_frequency) {
 286                         printk(KERN_ERR PREFIX
 287                                     "Invalid _PSS data: freq is zero\n");
 288                         result = -EFAULT;
 289                         kfree(pr->performance->states);
 290                         goto end;
 291                 }
 292         }
 293
 294       end:
 295         kfree(buffer.pointer);
 296
 297         return result;
 298 }
 299
 300 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 301 {
 302         int result = 0;
 303         acpi_status status = AE_OK;
 304         acpi_handle handle = NULL;
 305
 306
 307         if (!pr || !pr->performance || !pr->handle)
 308                 return -EINVAL;
 309
 310         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 311         if (ACPI_FAILURE(status)) {
 312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 313                                   "ACPI-based processor performance control unavailable\n"));
 314                 return -ENODEV;
 315         }
 316
 317         result = acpi_processor_get_performance_control(pr);
 318         if (result)
 319                 return result;
 320
 321         result = acpi_processor_get_performance_states(pr);
 322         if (result)
 323                 return result;
 324
 325         result = acpi_processor_get_platform_limit(pr);
 326         if (result)
 327                 return result;
 328
 329         return 0;
 330 }
 331
 332 int acpi_processor_notify_smm(struct module *calling_module)
 333 {
 334         acpi_status status;
 335         static int is_done = 0;
 336
 337
 338         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 339                 return -EBUSY;
 340
 341         if (!try_module_get(calling_module))
 342                 return -EINVAL;
 343
 344         /* is_done is set to negative if an error occured,
 345          * and to postitive if _no_ error occured, but SMM
 346          * was already notified. This avoids double notification
 347          * which might lead to unexpected results...
 348          */
 349         if (is_done > 0) {
 350                 module_put(calling_module);
 351                 return 0;
 352         } else if (is_done < 0) {
 353                 module_put(calling_module);
 354                 return is_done;
 355         }
 356
 357         is_done = -EIO;
 358
 359         /* Can't write pstate_cnt to smi_cmd if either value is zero */
 360         if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
 361                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
 362                 module_put(calling_module);
 363                 return 0;
 364         }
 365
 366         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 367                           "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
 368                           acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
 369
 370         /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
 371          * it anyway, so we need to support it... */
 372         if (acpi_fadt_is_v1) {
 373                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 374                                   "Using v1.0 FADT reserved value for pstate_cnt\n"));
 375         }
 376
 377         status = acpi_os_write_port(acpi_fadt.smi_cmd,
 378                                     (u32) acpi_fadt.pstate_cnt, 8);
 379         if (ACPI_FAILURE(status)) {
 380                 ACPI_EXCEPTION((AE_INFO, status,
 381                                 "Failed to write pstate_cnt [0x%x] to "
 382                                 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
 383                                 acpi_fadt.smi_cmd));
 384                 module_put(calling_module);
 385                 return status;
 386         }
 387
 388         /* Success. If there's no _PPC, we need to fear nothing, so
 389          * we can allow the cpufreq driver to be rmmod'ed. */
 390         is_done = 1;
 391
 392         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 393                 module_put(calling_module);
 394
 395         return 0;
 396 }
 397
 398 EXPORT_SYMBOL(acpi_processor_notify_smm);
 399
 400 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 401 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 402
 403 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 404 static struct file_operations acpi_processor_perf_fops = {
 405         .open = acpi_processor_perf_open_fs,
 406         .read = seq_read,
 407         .llseek = seq_lseek,
 408         .release = single_release,
 409 };
 410
 411 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 412 {
 413         struct acpi_processor *pr = seq->private;
 414         int i;
 415
 416
 417         if (!pr)
 418                 goto end;
 419
 420         if (!pr->performance) {
 421                 seq_puts(seq, "<not supported>\n");
 422                 goto end;
 423         }
 424
 425         seq_printf(seq, "state count:             %d\n"
 426                    "active state:            P%d\n",
 427                    pr->performance->state_count, pr->performance->state);
 428
 429         seq_puts(seq, "states:\n");
 430         for (i = 0; i < pr->performance->state_count; i++)
 431                 seq_printf(seq,
 432                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 433                            (i == pr->performance->state ? '*' : ' '), i,
 434                            (u32) pr->performance->states[i].core_frequency,
 435                            (u32) pr->performance->states[i].power,
 436                            (u32) pr->performance->states[i].transition_latency);
 437
 438       end:
 439         return 0;
 440 }
 441
 442 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 443 {
 444         return single_open(file, acpi_processor_perf_seq_show,
 445                            PDE(inode)->data);
 446 }
 447
 448 static ssize_t
 449 acpi_processor_write_performance(struct file *file,
 450                                  const char __user * buffer,
 451                                  size_t count, loff_t * data)
 452 {
 453         int result = 0;
 454         struct seq_file *m = file->private_data;
 455         struct acpi_processor *pr = m->private;
 456         struct acpi_processor_performance *perf;
 457         char state_string[12] = { '\0' };
 458         unsigned int new_state = 0;
 459         struct cpufreq_policy policy;
 460
 461
 462         if (!pr || (count > sizeof(state_string) - 1))
 463                 return -EINVAL;
 464
 465         perf = pr->performance;
 466         if (!perf)
 467                 return -EINVAL;
 468
 469         if (copy_from_user(state_string, buffer, count))
 470                 return -EFAULT;
 471
 472         state_string[count] = '\0';
 473         new_state = simple_strtoul(state_string, NULL, 0);
 474
 475         if (new_state >= perf->state_count)
 476                 return -EINVAL;
 477
 478         cpufreq_get_policy(&policy, pr->id);
 479
 480         policy.cpu = pr->id;
 481         policy.min = perf->states[new_state].core_frequency * 1000;
 482         policy.max = perf->states[new_state].core_frequency * 1000;
 483
 484         result = cpufreq_set_policy(&policy);
 485         if (result)
 486                 return result;
 487
 488         return count;
 489 }
 490
 491 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 492 {
 493         struct proc_dir_entry *entry = NULL;
 494         struct acpi_device *device = NULL;
 495
 496
 497         if (acpi_bus_get_device(pr->handle, &device))
 498                 return;
 499
 500         /* add file 'performance' [R/W] */
 501         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 502                                   S_IFREG | S_IRUGO | S_IWUSR,
 503                                   acpi_device_dir(device));
 504         if (entry){
 505                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
 506                 entry->proc_fops = &acpi_processor_perf_fops;
 507                 entry->data = acpi_driver_data(device);
 508                 entry->owner = THIS_MODULE;
 509         }
 510         return;
 511 }
 512
 513 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 514 {
 515         struct acpi_device *device = NULL;
 516
 517
 518         if (acpi_bus_get_device(pr->handle, &device))
 519                 return;
 520
 521         /* remove file 'performance' */
 522         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 523                           acpi_device_dir(device));
 524
 525         return;
 526 }
 527
 528 #else
 529 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 530 {
 531         return;
 532 }
 533 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 534 {
 535         return;
 536 }
 537 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 538
 539 static int acpi_processor_get_psd(struct acpi_processor *pr)
 540 {
 541         int result = 0;
 542         acpi_status status = AE_OK;
 543         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 544         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 545         struct acpi_buffer state = {0, NULL};
 546         union acpi_object  *psd = NULL;
 547         struct acpi_psd_package *pdomain;
 548
 549         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 550         if (ACPI_FAILURE(status)) {
 551                 return -ENODEV;
 552         }
 553
 554         psd = buffer.pointer;
 555         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 556                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 557                 result = -EFAULT;
 558                 goto end;
 559         }
 560
 561         if (psd->package.count != 1) {
 562                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 563                 result = -EFAULT;
 564                 goto end;
 565         }
 566
 567         pdomain = &(pr->performance->domain_info);
 568
 569         state.length = sizeof(struct acpi_psd_package);
 570         state.pointer = pdomain;
 571
 572         status = acpi_extract_package(&(psd->package.elements[0]),
 573                 &format, &state);
 574         if (ACPI_FAILURE(status)) {
 575                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 576                 result = -EFAULT;
 577                 goto end;
 578         }
 579
 580         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 581                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 582                 result = -EFAULT;
 583                 goto end;
 584         }
 585
 586         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 587                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 588                 result = -EFAULT;
 589                 goto end;
 590         }
 591
 592 end:
 593         kfree(buffer.pointer);
 594         return result;
 595 }
 596
 597 int acpi_processor_preregister_performance(
 598                 struct acpi_processor_performance **performance)
 599 {
 600         int count, count_target;
 601         int retval = 0;
 602         unsigned int i, j;
 603         cpumask_t covered_cpus;
 604         struct acpi_processor *pr;
 605         struct acpi_psd_package *pdomain;
 606         struct acpi_processor *match_pr;
 607         struct acpi_psd_package *match_pdomain;
 608
 609         mutex_lock(&performance_mutex);
 610
 611         retval = 0;
 612
 613         /* Call _PSD for all CPUs */
 614         for_each_possible_cpu(i) {
 615                 pr = processors[i];
 616                 if (!pr) {
 617                         /* Look only at processors in ACPI namespace */
 618                         continue;
 619                 }
 620
 621                 if (pr->performance) {
 622                         retval = -EBUSY;
 623                         continue;
 624                 }
 625
 626                 if (!performance || !performance[i]) {
 627                         retval = -EINVAL;
 628                         continue;
 629                 }
 630
 631                 pr->performance = performance[i];
 632                 cpu_set(i, pr->performance->shared_cpu_map);
 633                 if (acpi_processor_get_psd(pr)) {
 634                         retval = -EINVAL;
 635                         continue;
 636                 }
 637         }
 638         if (retval)
 639                 goto err_ret;
 640
 641         /*
 642          * Now that we have _PSD data from all CPUs, lets setup P-state
 643          * domain info.
 644          */
 645         for_each_possible_cpu(i) {
 646                 pr = processors[i];
 647                 if (!pr)
 648                         continue;
 649
 650                 /* Basic validity check for domain info */
 651                 pdomain = &(pr->performance->domain_info);
 652                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 653                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 654                         retval = -EINVAL;
 655                         goto err_ret;
 656                 }
 657                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 658                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 659                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 660                         retval = -EINVAL;
 661                         goto err_ret;
 662                 }
 663         }
 664
 665         cpus_clear(covered_cpus);
 666         for_each_possible_cpu(i) {
 667                 pr = processors[i];
 668                 if (!pr)
 669                         continue;
 670
 671                 if (cpu_isset(i, covered_cpus))
 672                         continue;
 673
 674                 pdomain = &(pr->performance->domain_info);
 675                 cpu_set(i, pr->performance->shared_cpu_map);
 676                 cpu_set(i, covered_cpus);
 677                 if (pdomain->num_processors <= 1)
 678                         continue;
 679
 680                 /* Validate the Domain info */
 681                 count_target = pdomain->num_processors;
 682                 count = 1;
 683                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 684                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 685                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 686                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 687                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 688                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 689
 690                 for_each_possible_cpu(j) {
 691                         if (i == j)
 692                                 continue;
 693
 694                         match_pr = processors[j];
 695                         if (!match_pr)
 696                                 continue;
 697
 698                         match_pdomain = &(match_pr->performance->domain_info);
 699                         if (match_pdomain->domain != pdomain->domain)
 700                                 continue;
 701
 702                         /* Here i and j are in the same domain */
 703
 704                         if (match_pdomain->num_processors != count_target) {
 705                                 retval = -EINVAL;
 706                                 goto err_ret;
 707                         }
 708
 709                         if (pdomain->coord_type != match_pdomain->coord_type) {
 710                                 retval = -EINVAL;
 711                                 goto err_ret;
 712                         }
 713
 714                         cpu_set(j, covered_cpus);
 715                         cpu_set(j, pr->performance->shared_cpu_map);
 716                         count++;
 717                 }
 718
 719                 for_each_possible_cpu(j) {
 720                         if (i == j)
 721                                 continue;
 722
 723                         match_pr = processors[j];
 724                         if (!match_pr)
 725                                 continue;
 726
 727                         match_pdomain = &(match_pr->performance->domain_info);
 728                         if (match_pdomain->domain != pdomain->domain)
 729                                 continue;
 730
 731                         match_pr->performance->shared_type =
 732                                         pr->performance->shared_type;
 733                         match_pr->performance->shared_cpu_map =
 734                                 pr->performance->shared_cpu_map;
 735                 }
 736         }
 737
 738 err_ret:
 739         if (retval) {
 740                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n"));
 741         }
 742
 743         for_each_possible_cpu(i) {
 744                 pr = processors[i];
 745                 if (!pr || !pr->performance)
 746                         continue;
 747
 748                 /* Assume no coordination on any error parsing domain info */
 749                 if (retval) {
 750                         cpus_clear(pr->performance->shared_cpu_map);
 751                         cpu_set(i, pr->performance->shared_cpu_map);
 752                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 753                 }
 754                 pr->performance = NULL; /* Will be set for real in register */
 755         }
 756
 757         mutex_unlock(&performance_mutex);
 758         return retval;
 759 }
 760 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 761
 762
 763 int
 764 acpi_processor_register_performance(struct acpi_processor_performance
 765                                     *performance, unsigned int cpu)
 766 {
 767         struct acpi_processor *pr;
 768
 769
 770         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 771                 return -EINVAL;
 772
 773         mutex_lock(&performance_mutex);
 774
 775         pr = processors[cpu];
 776         if (!pr) {
 777                 mutex_unlock(&performance_mutex);
 778                 return -ENODEV;
 779         }
 780
 781         if (pr->performance) {
 782                 mutex_unlock(&performance_mutex);
 783                 return -EBUSY;
 784         }
 785
 786         WARN_ON(!performance);
 787
 788         pr->performance = performance;
 789
 790         if (acpi_processor_get_performance_info(pr)) {
 791                 pr->performance = NULL;
 792                 mutex_unlock(&performance_mutex);
 793                 return -EIO;
 794         }
 795
 796         acpi_cpufreq_add_file(pr);
 797
 798         mutex_unlock(&performance_mutex);
 799         return 0;
 800 }
 801
 802 EXPORT_SYMBOL(acpi_processor_register_performance);
 803
 804 void
 805 acpi_processor_unregister_performance(struct acpi_processor_performance
 806                                       *performance, unsigned int cpu)
 807 {
 808         struct acpi_processor *pr;
 809
 810
 811         mutex_lock(&performance_mutex);
 812
 813         pr = processors[cpu];
 814         if (!pr) {
 815                 mutex_unlock(&performance_mutex);
 816                 return;
 817         }
 818
 819         if (pr->performance)
 820                 kfree(pr->performance->states);
 821         pr->performance = NULL;
 822
 823         acpi_cpufreq_remove_file(pr);
 824
 825         mutex_unlock(&performance_mutex);
 826
 827         return;
 828 }
 829
 830 EXPORT_SYMBOL(acpi_processor_unregister_performance);