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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 = per_cpu(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         .owner = THIS_MODULE,
 415         .open = acpi_processor_perf_open_fs,
 416         .read = seq_read,
 417         .llseek = seq_lseek,
 418         .release = single_release,
 419 };
 420
 421 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 422 {
 423         struct acpi_processor *pr = seq->private;
 424         int i;
 425
 426
 427         if (!pr)
 428                 goto end;
 429
 430         if (!pr->performance) {
 431                 seq_puts(seq, "<not supported>\n");
 432                 goto end;
 433         }
 434
 435         seq_printf(seq, "state count:             %d\n"
 436                    "active state:            P%d\n",
 437                    pr->performance->state_count, pr->performance->state);
 438
 439         seq_puts(seq, "states:\n");
 440         for (i = 0; i < pr->performance->state_count; i++)
 441                 seq_printf(seq,
 442                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 443                            (i == pr->performance->state ? '*' : ' '), i,
 444                            (u32) pr->performance->states[i].core_frequency,
 445                            (u32) pr->performance->states[i].power,
 446                            (u32) pr->performance->states[i].transition_latency);
 447
 448       end:
 449         return 0;
 450 }
 451
 452 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 453 {
 454         return single_open(file, acpi_processor_perf_seq_show,
 455                            PDE(inode)->data);
 456 }
 457
 458 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 459 {
 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         proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
 468                          acpi_device_dir(device),
 469                          &acpi_processor_perf_fops, acpi_driver_data(device));
 470         return;
 471 }
 472
 473 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 474 {
 475         struct acpi_device *device = NULL;
 476
 477
 478         if (acpi_bus_get_device(pr->handle, &device))
 479                 return;
 480
 481         /* remove file 'performance' */
 482         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 483                           acpi_device_dir(device));
 484
 485         return;
 486 }
 487
 488 #else
 489 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 490 {
 491         return;
 492 }
 493 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 494 {
 495         return;
 496 }
 497 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 498
 499 static int acpi_processor_get_psd(struct acpi_processor *pr)
 500 {
 501         int result = 0;
 502         acpi_status status = AE_OK;
 503         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 504         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 505         struct acpi_buffer state = {0, NULL};
 506         union acpi_object  *psd = NULL;
 507         struct acpi_psd_package *pdomain;
 508
 509         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 510         if (ACPI_FAILURE(status)) {
 511                 return -ENODEV;
 512         }
 513
 514         psd = buffer.pointer;
 515         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 516                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 517                 result = -EFAULT;
 518                 goto end;
 519         }
 520
 521         if (psd->package.count != 1) {
 522                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 523                 result = -EFAULT;
 524                 goto end;
 525         }
 526
 527         pdomain = &(pr->performance->domain_info);
 528
 529         state.length = sizeof(struct acpi_psd_package);
 530         state.pointer = pdomain;
 531
 532         status = acpi_extract_package(&(psd->package.elements[0]),
 533                 &format, &state);
 534         if (ACPI_FAILURE(status)) {
 535                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 536                 result = -EFAULT;
 537                 goto end;
 538         }
 539
 540         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 541                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 542                 result = -EFAULT;
 543                 goto end;
 544         }
 545
 546         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 547                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 548                 result = -EFAULT;
 549                 goto end;
 550         }
 551
 552 end:
 553         kfree(buffer.pointer);
 554         return result;
 555 }
 556
 557 int acpi_processor_preregister_performance(
 558                 struct acpi_processor_performance *performance)
 559 {
 560         int count, count_target;
 561         int retval = 0;
 562         unsigned int i, j;
 563         cpumask_t covered_cpus;
 564         struct acpi_processor *pr;
 565         struct acpi_psd_package *pdomain;
 566         struct acpi_processor *match_pr;
 567         struct acpi_psd_package *match_pdomain;
 568
 569         mutex_lock(&performance_mutex);
 570
 571         retval = 0;
 572
 573         /* Call _PSD for all CPUs */
 574         for_each_possible_cpu(i) {
 575                 pr = per_cpu(processors, i);
 576                 if (!pr) {
 577                         /* Look only at processors in ACPI namespace */
 578                         continue;
 579                 }
 580
 581                 if (pr->performance) {
 582                         retval = -EBUSY;
 583                         continue;
 584                 }
 585
 586                 if (!performance || !percpu_ptr(performance, i)) {
 587                         retval = -EINVAL;
 588                         continue;
 589                 }
 590
 591                 pr->performance = percpu_ptr(performance, i);
 592                 cpu_set(i, pr->performance->shared_cpu_map);
 593                 if (acpi_processor_get_psd(pr)) {
 594                         retval = -EINVAL;
 595                         continue;
 596                 }
 597         }
 598         if (retval)
 599                 goto err_ret;
 600
 601         /*
 602          * Now that we have _PSD data from all CPUs, lets setup P-state
 603          * domain info.
 604          */
 605         for_each_possible_cpu(i) {
 606                 pr = per_cpu(processors, i);
 607                 if (!pr)
 608                         continue;
 609
 610                 /* Basic validity check for domain info */
 611                 pdomain = &(pr->performance->domain_info);
 612                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 613                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 614                         retval = -EINVAL;
 615                         goto err_ret;
 616                 }
 617                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 618                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 619                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 620                         retval = -EINVAL;
 621                         goto err_ret;
 622                 }
 623         }
 624
 625         cpus_clear(covered_cpus);
 626         for_each_possible_cpu(i) {
 627                 pr = per_cpu(processors, i);
 628                 if (!pr)
 629                         continue;
 630
 631                 if (cpu_isset(i, covered_cpus))
 632                         continue;
 633
 634                 pdomain = &(pr->performance->domain_info);
 635                 cpu_set(i, pr->performance->shared_cpu_map);
 636                 cpu_set(i, covered_cpus);
 637                 if (pdomain->num_processors <= 1)
 638                         continue;
 639
 640                 /* Validate the Domain info */
 641                 count_target = pdomain->num_processors;
 642                 count = 1;
 643                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 645                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 646                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 647                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 648                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 649
 650                 for_each_possible_cpu(j) {
 651                         if (i == j)
 652                                 continue;
 653
 654                         match_pr = per_cpu(processors, j);
 655                         if (!match_pr)
 656                                 continue;
 657
 658                         match_pdomain = &(match_pr->performance->domain_info);
 659                         if (match_pdomain->domain != pdomain->domain)
 660                                 continue;
 661
 662                         /* Here i and j are in the same domain */
 663
 664                         if (match_pdomain->num_processors != count_target) {
 665                                 retval = -EINVAL;
 666                                 goto err_ret;
 667                         }
 668
 669                         if (pdomain->coord_type != match_pdomain->coord_type) {
 670                                 retval = -EINVAL;
 671                                 goto err_ret;
 672                         }
 673
 674                         cpu_set(j, covered_cpus);
 675                         cpu_set(j, pr->performance->shared_cpu_map);
 676                         count++;
 677                 }
 678
 679                 for_each_possible_cpu(j) {
 680                         if (i == j)
 681                                 continue;
 682
 683                         match_pr = per_cpu(processors, j);
 684                         if (!match_pr)
 685                                 continue;
 686
 687                         match_pdomain = &(match_pr->performance->domain_info);
 688                         if (match_pdomain->domain != pdomain->domain)
 689                                 continue;
 690
 691                         match_pr->performance->shared_type =
 692                                         pr->performance->shared_type;
 693                         match_pr->performance->shared_cpu_map =
 694                                 pr->performance->shared_cpu_map;
 695                 }
 696         }
 697
 698 err_ret:
 699         for_each_possible_cpu(i) {
 700                 pr = per_cpu(processors, i);
 701                 if (!pr || !pr->performance)
 702                         continue;
 703
 704                 /* Assume no coordination on any error parsing domain info */
 705                 if (retval) {
 706                         cpus_clear(pr->performance->shared_cpu_map);
 707                         cpu_set(i, pr->performance->shared_cpu_map);
 708                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 709                 }
 710                 pr->performance = NULL; /* Will be set for real in register */
 711         }
 712
 713         mutex_unlock(&performance_mutex);
 714         return retval;
 715 }
 716 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 717
 718
 719 int
 720 acpi_processor_register_performance(struct acpi_processor_performance
 721                                     *performance, unsigned int cpu)
 722 {
 723         struct acpi_processor *pr;
 724
 725
 726         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 727                 return -EINVAL;
 728
 729         mutex_lock(&performance_mutex);
 730
 731         pr = per_cpu(processors, cpu);
 732         if (!pr) {
 733                 mutex_unlock(&performance_mutex);
 734                 return -ENODEV;
 735         }
 736
 737         if (pr->performance) {
 738                 mutex_unlock(&performance_mutex);
 739                 return -EBUSY;
 740         }
 741
 742         WARN_ON(!performance);
 743
 744         pr->performance = performance;
 745
 746         if (acpi_processor_get_performance_info(pr)) {
 747                 pr->performance = NULL;
 748                 mutex_unlock(&performance_mutex);
 749                 return -EIO;
 750         }
 751
 752         acpi_cpufreq_add_file(pr);
 753
 754         mutex_unlock(&performance_mutex);
 755         return 0;
 756 }
 757
 758 EXPORT_SYMBOL(acpi_processor_register_performance);
 759
 760 void
 761 acpi_processor_unregister_performance(struct acpi_processor_performance
 762                                       *performance, unsigned int cpu)
 763 {
 764         struct acpi_processor *pr;
 765
 766
 767         mutex_lock(&performance_mutex);
 768
 769         pr = per_cpu(processors, cpu);
 770         if (!pr) {
 771                 mutex_unlock(&performance_mutex);
 772                 return;
 773         }
 774
 775         if (pr->performance)
 776                 kfree(pr->performance->states);
 777         pr->performance = NULL;
 778
 779         acpi_cpufreq_remove_file(pr);
 780
 781         mutex_unlock(&performance_mutex);
 782
 783         return;
 784 }
 785
 786 EXPORT_SYMBOL(acpi_processor_unregister_performance);