drivers/acpi/processor_perflib.c

   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 /* ignore_ppc:
  68  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  69  *       ignore _PPC
  70  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  71  *  1 -> ignore _PPC totally -> forced by user through boot param
  72  */
  73 static int ignore_ppc = -1;
  74 module_param(ignore_ppc, int, 0644);
  75 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  76                  "limited by BIOS, this should help");
  77
  78 #define PPC_REGISTERED   1
  79 #define PPC_IN_USE       2
  80
  81 static int acpi_processor_ppc_status;
  82
  83 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  84                                        unsigned long event, void *data)
  85 {
  86         struct cpufreq_policy *policy = data;
  87         struct acpi_processor *pr;
  88         unsigned int ppc = 0;
  89
  90         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  91                 ignore_ppc = 0;
  92                 return 0;
  93         }
  94
  95         if (ignore_ppc)
  96                 return 0;
  97
  98         if (event != CPUFREQ_INCOMPATIBLE)
  99                 return 0;
 100
 101         mutex_lock(&performance_mutex);
 102
 103         pr = per_cpu(processors, policy->cpu);
 104         if (!pr || !pr->performance)
 105                 goto out;
 106
 107         ppc = (unsigned int)pr->performance_platform_limit;
 108
 109         if (ppc >= pr->performance->state_count)
 110                 goto out;
 111
 112         cpufreq_verify_within_limits(policy, 0,
 113                                      pr->performance->states[ppc].
 114                                      core_frequency * 1000);
 115
 116       out:
 117         mutex_unlock(&performance_mutex);
 118
 119         return 0;
 120 }
 121
 122 static struct notifier_block acpi_ppc_notifier_block = {
 123         .notifier_call = acpi_processor_ppc_notifier,
 124 };
 125
 126 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 127 {
 128         acpi_status status = 0;
 129         unsigned long ppc = 0;
 130
 131
 132         if (!pr)
 133                 return -EINVAL;
 134
 135         /*
 136          * _PPC indicates the maximum state currently supported by the platform
 137          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 138          */
 139         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 140
 141         if (status != AE_NOT_FOUND)
 142                 acpi_processor_ppc_status |= PPC_IN_USE;
 143
 144         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 145                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 146                 return -ENODEV;
 147         }
 148
 149         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 150                        (int)ppc, ppc ? "" : "not");
 151
 152         pr->performance_platform_limit = (int)ppc;
 153
 154         return 0;
 155 }
 156
 157 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 158 {
 159         int ret;
 160
 161         if (ignore_ppc)
 162                 return 0;
 163
 164         ret = acpi_processor_get_platform_limit(pr);
 165
 166         if (ret < 0)
 167                 return (ret);
 168         else
 169                 return cpufreq_update_policy(pr->id);
 170 }
 171
 172 void acpi_processor_ppc_init(void)
 173 {
 174         if (!cpufreq_register_notifier
 175             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 176                 acpi_processor_ppc_status |= PPC_REGISTERED;
 177         else
 178                 printk(KERN_DEBUG
 179                        "Warning: Processor Platform Limit not supported.\n");
 180 }
 181
 182 void acpi_processor_ppc_exit(void)
 183 {
 184         if (acpi_processor_ppc_status & PPC_REGISTERED)
 185                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 186                                             CPUFREQ_POLICY_NOTIFIER);
 187
 188         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 189 }
 190
 191 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 192 {
 193         int result = 0;
 194         acpi_status status = 0;
 195         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 196         union acpi_object *pct = NULL;
 197         union acpi_object obj = { 0 };
 198
 199
 200         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 201         if (ACPI_FAILURE(status)) {
 202                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 203                 return -ENODEV;
 204         }
 205
 206         pct = (union acpi_object *)buffer.pointer;
 207         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 208             || (pct->package.count != 2)) {
 209                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 210                 result = -EFAULT;
 211                 goto end;
 212         }
 213
 214         /*
 215          * control_register
 216          */
 217
 218         obj = pct->package.elements[0];
 219
 220         if ((obj.type != ACPI_TYPE_BUFFER)
 221             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 222             || (obj.buffer.pointer == NULL)) {
 223                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 224                 result = -EFAULT;
 225                 goto end;
 226         }
 227         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 228                sizeof(struct acpi_pct_register));
 229
 230         /*
 231          * status_register
 232          */
 233
 234         obj = pct->package.elements[1];
 235
 236         if ((obj.type != ACPI_TYPE_BUFFER)
 237             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 238             || (obj.buffer.pointer == NULL)) {
 239                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 240                 result = -EFAULT;
 241                 goto end;
 242         }
 243
 244         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 245                sizeof(struct acpi_pct_register));
 246
 247       end:
 248         kfree(buffer.pointer);
 249
 250         return result;
 251 }
 252
 253 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 254 {
 255         int result = 0;
 256         acpi_status status = AE_OK;
 257         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 258         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 259         struct acpi_buffer state = { 0, NULL };
 260         union acpi_object *pss = NULL;
 261         int i;
 262
 263
 264         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 265         if (ACPI_FAILURE(status)) {
 266                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 267                 return -ENODEV;
 268         }
 269
 270         pss = buffer.pointer;
 271         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 272                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 273                 result = -EFAULT;
 274                 goto end;
 275         }
 276
 277         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 278                           pss->package.count));
 279
 280         pr->performance->state_count = pss->package.count;
 281         pr->performance->states =
 282             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 283                     GFP_KERNEL);
 284         if (!pr->performance->states) {
 285                 result = -ENOMEM;
 286                 goto end;
 287         }
 288
 289         for (i = 0; i < pr->performance->state_count; i++) {
 290
 291                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 292
 293                 state.length = sizeof(struct acpi_processor_px);
 294                 state.pointer = px;
 295
 296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 297
 298                 status = acpi_extract_package(&(pss->package.elements[i]),
 299                                               &format, &state);
 300                 if (ACPI_FAILURE(status)) {
 301                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 302                         result = -EFAULT;
 303                         kfree(pr->performance->states);
 304                         goto end;
 305                 }
 306
 307                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 308                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 309                                   i,
 310                                   (u32) px->core_frequency,
 311                                   (u32) px->power,
 312                                   (u32) px->transition_latency,
 313                                   (u32) px->bus_master_latency,
 314                                   (u32) px->control, (u32) px->status));
 315
 316                 if (!px->core_frequency) {
 317                         printk(KERN_ERR PREFIX
 318                                     "Invalid _PSS data: freq is zero\n");
 319                         result = -EFAULT;
 320                         kfree(pr->performance->states);
 321                         goto end;
 322                 }
 323         }
 324
 325       end:
 326         kfree(buffer.pointer);
 327
 328         return result;
 329 }
 330
 331 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 332 {
 333         int result = 0;
 334         acpi_status status = AE_OK;
 335         acpi_handle handle = NULL;
 336
 337
 338         if (!pr || !pr->performance || !pr->handle)
 339                 return -EINVAL;
 340
 341         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 342         if (ACPI_FAILURE(status)) {
 343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 344                                   "ACPI-based processor performance control unavailable\n"));
 345                 return -ENODEV;
 346         }
 347
 348         result = acpi_processor_get_performance_control(pr);
 349         if (result)
 350                 return result;
 351
 352         result = acpi_processor_get_performance_states(pr);
 353         if (result)
 354                 return result;
 355
 356         return 0;
 357 }
 358
 359 int acpi_processor_notify_smm(struct module *calling_module)
 360 {
 361         acpi_status status;
 362         static int is_done = 0;
 363
 364
 365         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 366                 return -EBUSY;
 367
 368         if (!try_module_get(calling_module))
 369                 return -EINVAL;
 370
 371         /* is_done is set to negative if an error occured,
 372          * and to postitive if _no_ error occured, but SMM
 373          * was already notified. This avoids double notification
 374          * which might lead to unexpected results...
 375          */
 376         if (is_done > 0) {
 377                 module_put(calling_module);
 378                 return 0;
 379         } else if (is_done < 0) {
 380                 module_put(calling_module);
 381                 return is_done;
 382         }
 383
 384         is_done = -EIO;
 385
 386         /* Can't write pstate_control to smi_command if either value is zero */
 387         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 388                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 389                 module_put(calling_module);
 390                 return 0;
 391         }
 392
 393         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 394                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 395                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 396
 397         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 398                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 399         if (ACPI_FAILURE(status)) {
 400                 ACPI_EXCEPTION((AE_INFO, status,
 401                                 "Failed to write pstate_control [0x%x] to "
 402                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 403                                 acpi_gbl_FADT.smi_command));
 404                 module_put(calling_module);
 405                 return status;
 406         }
 407
 408         /* Success. If there's no _PPC, we need to fear nothing, so
 409          * we can allow the cpufreq driver to be rmmod'ed. */
 410         is_done = 1;
 411
 412         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 413                 module_put(calling_module);
 414
 415         return 0;
 416 }
 417
 418 EXPORT_SYMBOL(acpi_processor_notify_smm);
 419
 420 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 421 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 422
 423 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 424 static struct file_operations acpi_processor_perf_fops = {
 425         .owner = THIS_MODULE,
 426         .open = acpi_processor_perf_open_fs,
 427         .read = seq_read,
 428         .llseek = seq_lseek,
 429         .release = single_release,
 430 };
 431
 432 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 433 {
 434         struct acpi_processor *pr = seq->private;
 435         int i;
 436
 437
 438         if (!pr)
 439                 goto end;
 440
 441         if (!pr->performance) {
 442                 seq_puts(seq, "<not supported>\n");
 443                 goto end;
 444         }
 445
 446         seq_printf(seq, "state count:             %d\n"
 447                    "active state:            P%d\n",
 448                    pr->performance->state_count, pr->performance->state);
 449
 450         seq_puts(seq, "states:\n");
 451         for (i = 0; i < pr->performance->state_count; i++)
 452                 seq_printf(seq,
 453                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 454                            (i == pr->performance->state ? '*' : ' '), i,
 455                            (u32) pr->performance->states[i].core_frequency,
 456                            (u32) pr->performance->states[i].power,
 457                            (u32) pr->performance->states[i].transition_latency);
 458
 459       end:
 460         return 0;
 461 }
 462
 463 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 464 {
 465         return single_open(file, acpi_processor_perf_seq_show,
 466                            PDE(inode)->data);
 467 }
 468
 469 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 470 {
 471         struct acpi_device *device = NULL;
 472
 473
 474         if (acpi_bus_get_device(pr->handle, &device))
 475                 return;
 476
 477         /* add file 'performance' [R/W] */
 478         proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
 479                          acpi_device_dir(device),
 480                          &acpi_processor_perf_fops, acpi_driver_data(device));
 481         return;
 482 }
 483
 484 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 485 {
 486         struct acpi_device *device = NULL;
 487
 488
 489         if (acpi_bus_get_device(pr->handle, &device))
 490                 return;
 491
 492         /* remove file 'performance' */
 493         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 494                           acpi_device_dir(device));
 495
 496         return;
 497 }
 498
 499 #else
 500 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 501 {
 502         return;
 503 }
 504 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 505 {
 506         return;
 507 }
 508 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 509
 510 static int acpi_processor_get_psd(struct acpi_processor *pr)
 511 {
 512         int result = 0;
 513         acpi_status status = AE_OK;
 514         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 515         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 516         struct acpi_buffer state = {0, NULL};
 517         union acpi_object  *psd = NULL;
 518         struct acpi_psd_package *pdomain;
 519
 520         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 521         if (ACPI_FAILURE(status)) {
 522                 return -ENODEV;
 523         }
 524
 525         psd = buffer.pointer;
 526         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 527                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 528                 result = -EFAULT;
 529                 goto end;
 530         }
 531
 532         if (psd->package.count != 1) {
 533                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 534                 result = -EFAULT;
 535                 goto end;
 536         }
 537
 538         pdomain = &(pr->performance->domain_info);
 539
 540         state.length = sizeof(struct acpi_psd_package);
 541         state.pointer = pdomain;
 542
 543         status = acpi_extract_package(&(psd->package.elements[0]),
 544                 &format, &state);
 545         if (ACPI_FAILURE(status)) {
 546                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 547                 result = -EFAULT;
 548                 goto end;
 549         }
 550
 551         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 552                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 553                 result = -EFAULT;
 554                 goto end;
 555         }
 556
 557         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 558                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 559                 result = -EFAULT;
 560                 goto end;
 561         }
 562
 563 end:
 564         kfree(buffer.pointer);
 565         return result;
 566 }
 567
 568 int acpi_processor_preregister_performance(
 569                 struct acpi_processor_performance *performance)
 570 {
 571         int count, count_target;
 572         int retval = 0;
 573         unsigned int i, j;
 574         cpumask_t covered_cpus;
 575         struct acpi_processor *pr;
 576         struct acpi_psd_package *pdomain;
 577         struct acpi_processor *match_pr;
 578         struct acpi_psd_package *match_pdomain;
 579
 580         mutex_lock(&performance_mutex);
 581
 582         retval = 0;
 583
 584         /* Call _PSD for all CPUs */
 585         for_each_possible_cpu(i) {
 586                 pr = per_cpu(processors, i);
 587                 if (!pr) {
 588                         /* Look only at processors in ACPI namespace */
 589                         continue;
 590                 }
 591
 592                 if (pr->performance) {
 593                         retval = -EBUSY;
 594                         continue;
 595                 }
 596
 597                 if (!performance || !percpu_ptr(performance, i)) {
 598                         retval = -EINVAL;
 599                         continue;
 600                 }
 601
 602                 pr->performance = percpu_ptr(performance, i);
 603                 cpu_set(i, pr->performance->shared_cpu_map);
 604                 if (acpi_processor_get_psd(pr)) {
 605                         retval = -EINVAL;
 606                         continue;
 607                 }
 608         }
 609         if (retval)
 610                 goto err_ret;
 611
 612         /*
 613          * Now that we have _PSD data from all CPUs, lets setup P-state
 614          * domain info.
 615          */
 616         for_each_possible_cpu(i) {
 617                 pr = per_cpu(processors, i);
 618                 if (!pr)
 619                         continue;
 620
 621                 /* Basic validity check for domain info */
 622                 pdomain = &(pr->performance->domain_info);
 623                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 624                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 625                         retval = -EINVAL;
 626                         goto err_ret;
 627                 }
 628                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 629                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 630                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 631                         retval = -EINVAL;
 632                         goto err_ret;
 633                 }
 634         }
 635
 636         cpus_clear(covered_cpus);
 637         for_each_possible_cpu(i) {
 638                 pr = per_cpu(processors, i);
 639                 if (!pr)
 640                         continue;
 641
 642                 if (cpu_isset(i, covered_cpus))
 643                         continue;
 644
 645                 pdomain = &(pr->performance->domain_info);
 646                 cpu_set(i, pr->performance->shared_cpu_map);
 647                 cpu_set(i, covered_cpus);
 648                 if (pdomain->num_processors <= 1)
 649                         continue;
 650
 651                 /* Validate the Domain info */
 652                 count_target = pdomain->num_processors;
 653                 count = 1;
 654                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 655                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 656                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 657                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 658                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 659                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 660
 661                 for_each_possible_cpu(j) {
 662                         if (i == j)
 663                                 continue;
 664
 665                         match_pr = per_cpu(processors, j);
 666                         if (!match_pr)
 667                                 continue;
 668
 669                         match_pdomain = &(match_pr->performance->domain_info);
 670                         if (match_pdomain->domain != pdomain->domain)
 671                                 continue;
 672
 673                         /* Here i and j are in the same domain */
 674
 675                         if (match_pdomain->num_processors != count_target) {
 676                                 retval = -EINVAL;
 677                                 goto err_ret;
 678                         }
 679
 680                         if (pdomain->coord_type != match_pdomain->coord_type) {
 681                                 retval = -EINVAL;
 682                                 goto err_ret;
 683                         }
 684
 685                         cpu_set(j, covered_cpus);
 686                         cpu_set(j, pr->performance->shared_cpu_map);
 687                         count++;
 688                 }
 689
 690                 for_each_possible_cpu(j) {
 691                         if (i == j)
 692                                 continue;
 693
 694                         match_pr = per_cpu(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                         match_pr->performance->shared_type =
 703                                         pr->performance->shared_type;
 704                         match_pr->performance->shared_cpu_map =
 705                                 pr->performance->shared_cpu_map;
 706                 }
 707         }
 708
 709 err_ret:
 710         for_each_possible_cpu(i) {
 711                 pr = per_cpu(processors, i);
 712                 if (!pr || !pr->performance)
 713                         continue;
 714
 715                 /* Assume no coordination on any error parsing domain info */
 716                 if (retval) {
 717                         cpus_clear(pr->performance->shared_cpu_map);
 718                         cpu_set(i, pr->performance->shared_cpu_map);
 719                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 720                 }
 721                 pr->performance = NULL; /* Will be set for real in register */
 722         }
 723
 724         mutex_unlock(&performance_mutex);
 725         return retval;
 726 }
 727 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 728
 729
 730 int
 731 acpi_processor_register_performance(struct acpi_processor_performance
 732                                     *performance, unsigned int cpu)
 733 {
 734         struct acpi_processor *pr;
 735
 736
 737         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 738                 return -EINVAL;
 739
 740         mutex_lock(&performance_mutex);
 741
 742         pr = per_cpu(processors, cpu);
 743         if (!pr) {
 744                 mutex_unlock(&performance_mutex);
 745                 return -ENODEV;
 746         }
 747
 748         if (pr->performance) {
 749                 mutex_unlock(&performance_mutex);
 750                 return -EBUSY;
 751         }
 752
 753         WARN_ON(!performance);
 754
 755         pr->performance = performance;
 756
 757         if (acpi_processor_get_performance_info(pr)) {
 758                 pr->performance = NULL;
 759                 mutex_unlock(&performance_mutex);
 760                 return -EIO;
 761         }
 762
 763         acpi_cpufreq_add_file(pr);
 764
 765         mutex_unlock(&performance_mutex);
 766         return 0;
 767 }
 768
 769 EXPORT_SYMBOL(acpi_processor_register_performance);
 770
 771 void
 772 acpi_processor_unregister_performance(struct acpi_processor_performance
 773                                       *performance, unsigned int cpu)
 774 {
 775         struct acpi_processor *pr;
 776
 777
 778         mutex_lock(&performance_mutex);
 779
 780         pr = per_cpu(processors, cpu);
 781         if (!pr) {
 782                 mutex_unlock(&performance_mutex);
 783                 return;
 784         }
 785
 786         if (pr->performance)
 787                 kfree(pr->performance->states);
 788         pr->performance = NULL;
 789
 790         acpi_cpufreq_remove_file(pr);
 791
 792         mutex_unlock(&performance_mutex);
 793
 794         return;
 795 }
 796
 797 EXPORT_SYMBOL(acpi_processor_unregister_performance);