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 #include <asm/cpufeature.h>
  42
  43 #include <acpi/acpi_bus.h>
  44 #include <acpi/processor.h>
  45
  46 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  47 #define ACPI_PROCESSOR_CLASS            "processor"
  48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  49 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  50 ACPI_MODULE_NAME("processor_perflib");
  51
  52 static DEFINE_MUTEX(performance_mutex);
  53
  54 /* Use cpufreq debug layer for _PPC changes. */
  55 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
  56                                                 "cpufreq-core", msg)
  57
  58 /*
  59  * _PPC support is implemented as a CPUfreq policy notifier:
  60  * This means each time a CPUfreq driver registered also with
  61  * the ACPI core is asked to change the speed policy, the maximum
  62  * value is adjusted so that it is within the platform limit.
  63  *
  64  * Also, when a new platform limit value is detected, the CPUfreq
  65  * policy is adjusted accordingly.
  66  */
  67
  68 /* ignore_ppc:
  69  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  70  *       ignore _PPC
  71  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  72  *  1 -> ignore _PPC totally -> forced by user through boot param
  73  */
  74 static int ignore_ppc = -1;
  75 module_param(ignore_ppc, int, 0644);
  76 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  77                  "limited by BIOS, this should help");
  78
  79 #define PPC_REGISTERED   1
  80 #define PPC_IN_USE       2
  81
  82 static int acpi_processor_ppc_status;
  83
  84 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  85                                        unsigned long event, void *data)
  86 {
  87         struct cpufreq_policy *policy = data;
  88         struct acpi_processor *pr;
  89         unsigned int ppc = 0;
  90
  91         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  92                 ignore_ppc = 0;
  93                 return 0;
  94         }
  95
  96         if (ignore_ppc)
  97                 return 0;
  98
  99         if (event != CPUFREQ_INCOMPATIBLE)
 100                 return 0;
 101
 102         mutex_lock(&performance_mutex);
 103
 104         pr = per_cpu(processors, policy->cpu);
 105         if (!pr || !pr->performance)
 106                 goto out;
 107
 108         ppc = (unsigned int)pr->performance_platform_limit;
 109
 110         if (ppc >= pr->performance->state_count)
 111                 goto out;
 112
 113         cpufreq_verify_within_limits(policy, 0,
 114                                      pr->performance->states[ppc].
 115                                      core_frequency * 1000);
 116
 117       out:
 118         mutex_unlock(&performance_mutex);
 119
 120         return 0;
 121 }
 122
 123 static struct notifier_block acpi_ppc_notifier_block = {
 124         .notifier_call = acpi_processor_ppc_notifier,
 125 };
 126
 127 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 128 {
 129         acpi_status status = 0;
 130         unsigned long long ppc = 0;
 131
 132
 133         if (!pr)
 134                 return -EINVAL;
 135
 136         /*
 137          * _PPC indicates the maximum state currently supported by the platform
 138          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 139          */
 140         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 141
 142         if (status != AE_NOT_FOUND)
 143                 acpi_processor_ppc_status |= PPC_IN_USE;
 144
 145         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 146                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 147                 return -ENODEV;
 148         }
 149
 150         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 151                        (int)ppc, ppc ? "" : "not");
 152
 153         pr->performance_platform_limit = (int)ppc;
 154
 155         return 0;
 156 }
 157
 158 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 159 {
 160         int ret;
 161
 162         if (ignore_ppc)
 163                 return 0;
 164
 165         ret = acpi_processor_get_platform_limit(pr);
 166
 167         if (ret < 0)
 168                 return (ret);
 169         else
 170                 return cpufreq_update_policy(pr->id);
 171 }
 172
 173 void acpi_processor_ppc_init(void)
 174 {
 175         if (!cpufreq_register_notifier
 176             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 177                 acpi_processor_ppc_status |= PPC_REGISTERED;
 178         else
 179                 printk(KERN_DEBUG
 180                        "Warning: Processor Platform Limit not supported.\n");
 181 }
 182
 183 void acpi_processor_ppc_exit(void)
 184 {
 185         if (acpi_processor_ppc_status & PPC_REGISTERED)
 186                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 187                                             CPUFREQ_POLICY_NOTIFIER);
 188
 189         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 190 }
 191
 192 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 193 {
 194         int result = 0;
 195         acpi_status status = 0;
 196         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 197         union acpi_object *pct = NULL;
 198         union acpi_object obj = { 0 };
 199
 200
 201         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 202         if (ACPI_FAILURE(status)) {
 203                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 204                 return -ENODEV;
 205         }
 206
 207         pct = (union acpi_object *)buffer.pointer;
 208         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 209             || (pct->package.count != 2)) {
 210                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 211                 result = -EFAULT;
 212                 goto end;
 213         }
 214
 215         /*
 216          * control_register
 217          */
 218
 219         obj = pct->package.elements[0];
 220
 221         if ((obj.type != ACPI_TYPE_BUFFER)
 222             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 223             || (obj.buffer.pointer == NULL)) {
 224                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 225                 result = -EFAULT;
 226                 goto end;
 227         }
 228         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 229                sizeof(struct acpi_pct_register));
 230
 231         /*
 232          * status_register
 233          */
 234
 235         obj = pct->package.elements[1];
 236
 237         if ((obj.type != ACPI_TYPE_BUFFER)
 238             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 239             || (obj.buffer.pointer == NULL)) {
 240                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 241                 result = -EFAULT;
 242                 goto end;
 243         }
 244
 245         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 246                sizeof(struct acpi_pct_register));
 247
 248       end:
 249         kfree(buffer.pointer);
 250
 251         return result;
 252 }
 253
 254 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 255 {
 256         int result = 0;
 257         acpi_status status = AE_OK;
 258         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 259         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 260         struct acpi_buffer state = { 0, NULL };
 261         union acpi_object *pss = NULL;
 262         int i;
 263
 264
 265         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 266         if (ACPI_FAILURE(status)) {
 267                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 268                 return -ENODEV;
 269         }
 270
 271         pss = buffer.pointer;
 272         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 273                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 274                 result = -EFAULT;
 275                 goto end;
 276         }
 277
 278         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 279                           pss->package.count));
 280
 281         pr->performance->state_count = pss->package.count;
 282         pr->performance->states =
 283             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 284                     GFP_KERNEL);
 285         if (!pr->performance->states) {
 286                 result = -ENOMEM;
 287                 goto end;
 288         }
 289
 290         for (i = 0; i < pr->performance->state_count; i++) {
 291
 292                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 293
 294                 state.length = sizeof(struct acpi_processor_px);
 295                 state.pointer = px;
 296
 297                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 298
 299                 status = acpi_extract_package(&(pss->package.elements[i]),
 300                                               &format, &state);
 301                 if (ACPI_FAILURE(status)) {
 302                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 303                         result = -EFAULT;
 304                         kfree(pr->performance->states);
 305                         goto end;
 306                 }
 307
 308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 309                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 310                                   i,
 311                                   (u32) px->core_frequency,
 312                                   (u32) px->power,
 313                                   (u32) px->transition_latency,
 314                                   (u32) px->bus_master_latency,
 315                                   (u32) px->control, (u32) px->status));
 316
 317                 if (!px->core_frequency) {
 318                         printk(KERN_ERR PREFIX
 319                                     "Invalid _PSS data: freq is zero\n");
 320                         result = -EFAULT;
 321                         kfree(pr->performance->states);
 322                         goto end;
 323                 }
 324         }
 325
 326       end:
 327         kfree(buffer.pointer);
 328
 329         return result;
 330 }
 331
 332 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 333 {
 334         int result = 0;
 335         acpi_status status = AE_OK;
 336         acpi_handle handle = NULL;
 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                 goto update_bios;
 351
 352         result = acpi_processor_get_performance_states(pr);
 353         if (result)
 354                 goto update_bios;
 355
 356         return 0;
 357
 358         /*
 359          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 360          * the BIOS is older than the CPU and does not know its frequencies
 361          */
 362  update_bios:
 363         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 364                 if(boot_cpu_has(X86_FEATURE_EST))
 365                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 366                                "frequency support\n");
 367         }
 368         return result;
 369 }
 370
 371 int acpi_processor_notify_smm(struct module *calling_module)
 372 {
 373         acpi_status status;
 374         static int is_done = 0;
 375
 376
 377         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 378                 return -EBUSY;
 379
 380         if (!try_module_get(calling_module))
 381                 return -EINVAL;
 382
 383         /* is_done is set to negative if an error occured,
 384          * and to postitive if _no_ error occured, but SMM
 385          * was already notified. This avoids double notification
 386          * which might lead to unexpected results...
 387          */
 388         if (is_done > 0) {
 389                 module_put(calling_module);
 390                 return 0;
 391         } else if (is_done < 0) {
 392                 module_put(calling_module);
 393                 return is_done;
 394         }
 395
 396         is_done = -EIO;
 397
 398         /* Can't write pstate_control to smi_command if either value is zero */
 399         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 400                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 401                 module_put(calling_module);
 402                 return 0;
 403         }
 404
 405         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 406                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 407                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 408
 409         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 410                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 411         if (ACPI_FAILURE(status)) {
 412                 ACPI_EXCEPTION((AE_INFO, status,
 413                                 "Failed to write pstate_control [0x%x] to "
 414                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 415                                 acpi_gbl_FADT.smi_command));
 416                 module_put(calling_module);
 417                 return status;
 418         }
 419
 420         /* Success. If there's no _PPC, we need to fear nothing, so
 421          * we can allow the cpufreq driver to be rmmod'ed. */
 422         is_done = 1;
 423
 424         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 425                 module_put(calling_module);
 426
 427         return 0;
 428 }
 429
 430 EXPORT_SYMBOL(acpi_processor_notify_smm);
 431
 432 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 433 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 434
 435 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 436 static struct file_operations acpi_processor_perf_fops = {
 437         .owner = THIS_MODULE,
 438         .open = acpi_processor_perf_open_fs,
 439         .read = seq_read,
 440         .llseek = seq_lseek,
 441         .release = single_release,
 442 };
 443
 444 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 445 {
 446         struct acpi_processor *pr = seq->private;
 447         int i;
 448
 449
 450         if (!pr)
 451                 goto end;
 452
 453         if (!pr->performance) {
 454                 seq_puts(seq, "<not supported>\n");
 455                 goto end;
 456         }
 457
 458         seq_printf(seq, "state count:             %d\n"
 459                    "active state:            P%d\n",
 460                    pr->performance->state_count, pr->performance->state);
 461
 462         seq_puts(seq, "states:\n");
 463         for (i = 0; i < pr->performance->state_count; i++)
 464                 seq_printf(seq,
 465                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 466                            (i == pr->performance->state ? '*' : ' '), i,
 467                            (u32) pr->performance->states[i].core_frequency,
 468                            (u32) pr->performance->states[i].power,
 469                            (u32) pr->performance->states[i].transition_latency);
 470
 471       end:
 472         return 0;
 473 }
 474
 475 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 476 {
 477         return single_open(file, acpi_processor_perf_seq_show,
 478                            PDE(inode)->data);
 479 }
 480
 481 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 482 {
 483         struct acpi_device *device = NULL;
 484
 485
 486         if (acpi_bus_get_device(pr->handle, &device))
 487                 return;
 488
 489         /* add file 'performance' [R/W] */
 490         proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
 491                          acpi_device_dir(device),
 492                          &acpi_processor_perf_fops, acpi_driver_data(device));
 493         return;
 494 }
 495
 496 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 497 {
 498         struct acpi_device *device = NULL;
 499
 500
 501         if (acpi_bus_get_device(pr->handle, &device))
 502                 return;
 503
 504         /* remove file 'performance' */
 505         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 506                           acpi_device_dir(device));
 507
 508         return;
 509 }
 510
 511 #else
 512 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 513 {
 514         return;
 515 }
 516 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 517 {
 518         return;
 519 }
 520 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 521
 522 static int acpi_processor_get_psd(struct acpi_processor *pr)
 523 {
 524         int result = 0;
 525         acpi_status status = AE_OK;
 526         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 527         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 528         struct acpi_buffer state = {0, NULL};
 529         union acpi_object  *psd = NULL;
 530         struct acpi_psd_package *pdomain;
 531
 532         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 533         if (ACPI_FAILURE(status)) {
 534                 return -ENODEV;
 535         }
 536
 537         psd = buffer.pointer;
 538         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 539                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 540                 result = -EFAULT;
 541                 goto end;
 542         }
 543
 544         if (psd->package.count != 1) {
 545                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 546                 result = -EFAULT;
 547                 goto end;
 548         }
 549
 550         pdomain = &(pr->performance->domain_info);
 551
 552         state.length = sizeof(struct acpi_psd_package);
 553         state.pointer = pdomain;
 554
 555         status = acpi_extract_package(&(psd->package.elements[0]),
 556                 &format, &state);
 557         if (ACPI_FAILURE(status)) {
 558                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 559                 result = -EFAULT;
 560                 goto end;
 561         }
 562
 563         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 564                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 565                 result = -EFAULT;
 566                 goto end;
 567         }
 568
 569         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 570                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 571                 result = -EFAULT;
 572                 goto end;
 573         }
 574
 575 end:
 576         kfree(buffer.pointer);
 577         return result;
 578 }
 579
 580 int acpi_processor_preregister_performance(
 581                 struct acpi_processor_performance *performance)
 582 {
 583         int count, count_target;
 584         int retval = 0;
 585         unsigned int i, j;
 586         cpumask_t covered_cpus;
 587         struct acpi_processor *pr;
 588         struct acpi_psd_package *pdomain;
 589         struct acpi_processor *match_pr;
 590         struct acpi_psd_package *match_pdomain;
 591
 592         mutex_lock(&performance_mutex);
 593
 594         retval = 0;
 595
 596         /* Call _PSD for all CPUs */
 597         for_each_possible_cpu(i) {
 598                 pr = per_cpu(processors, i);
 599                 if (!pr) {
 600                         /* Look only at processors in ACPI namespace */
 601                         continue;
 602                 }
 603
 604                 if (pr->performance) {
 605                         retval = -EBUSY;
 606                         continue;
 607                 }
 608
 609                 if (!performance || !percpu_ptr(performance, i)) {
 610                         retval = -EINVAL;
 611                         continue;
 612                 }
 613
 614                 pr->performance = percpu_ptr(performance, i);
 615                 cpu_set(i, pr->performance->shared_cpu_map);
 616                 if (acpi_processor_get_psd(pr)) {
 617                         retval = -EINVAL;
 618                         continue;
 619                 }
 620         }
 621         if (retval)
 622                 goto err_ret;
 623
 624         /*
 625          * Now that we have _PSD data from all CPUs, lets setup P-state
 626          * domain info.
 627          */
 628         for_each_possible_cpu(i) {
 629                 pr = per_cpu(processors, i);
 630                 if (!pr)
 631                         continue;
 632
 633                 /* Basic validity check for domain info */
 634                 pdomain = &(pr->performance->domain_info);
 635                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 636                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 637                         retval = -EINVAL;
 638                         goto err_ret;
 639                 }
 640                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 641                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 642                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 643                         retval = -EINVAL;
 644                         goto err_ret;
 645                 }
 646         }
 647
 648         cpus_clear(covered_cpus);
 649         for_each_possible_cpu(i) {
 650                 pr = per_cpu(processors, i);
 651                 if (!pr)
 652                         continue;
 653
 654                 if (cpu_isset(i, covered_cpus))
 655                         continue;
 656
 657                 pdomain = &(pr->performance->domain_info);
 658                 cpu_set(i, pr->performance->shared_cpu_map);
 659                 cpu_set(i, covered_cpus);
 660                 if (pdomain->num_processors <= 1)
 661                         continue;
 662
 663                 /* Validate the Domain info */
 664                 count_target = pdomain->num_processors;
 665                 count = 1;
 666                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 667                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 668                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 669                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 670                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 671                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 672
 673                 for_each_possible_cpu(j) {
 674                         if (i == j)
 675                                 continue;
 676
 677                         match_pr = per_cpu(processors, j);
 678                         if (!match_pr)
 679                                 continue;
 680
 681                         match_pdomain = &(match_pr->performance->domain_info);
 682                         if (match_pdomain->domain != pdomain->domain)
 683                                 continue;
 684
 685                         /* Here i and j are in the same domain */
 686
 687                         if (match_pdomain->num_processors != count_target) {
 688                                 retval = -EINVAL;
 689                                 goto err_ret;
 690                         }
 691
 692                         if (pdomain->coord_type != match_pdomain->coord_type) {
 693                                 retval = -EINVAL;
 694                                 goto err_ret;
 695                         }
 696
 697                         cpu_set(j, covered_cpus);
 698                         cpu_set(j, pr->performance->shared_cpu_map);
 699                         count++;
 700                 }
 701
 702                 for_each_possible_cpu(j) {
 703                         if (i == j)
 704                                 continue;
 705
 706                         match_pr = per_cpu(processors, j);
 707                         if (!match_pr)
 708                                 continue;
 709
 710                         match_pdomain = &(match_pr->performance->domain_info);
 711                         if (match_pdomain->domain != pdomain->domain)
 712                                 continue;
 713
 714                         match_pr->performance->shared_type =
 715                                         pr->performance->shared_type;
 716                         match_pr->performance->shared_cpu_map =
 717                                 pr->performance->shared_cpu_map;
 718                 }
 719         }
 720
 721 err_ret:
 722         for_each_possible_cpu(i) {
 723                 pr = per_cpu(processors, i);
 724                 if (!pr || !pr->performance)
 725                         continue;
 726
 727                 /* Assume no coordination on any error parsing domain info */
 728                 if (retval) {
 729                         cpus_clear(pr->performance->shared_cpu_map);
 730                         cpu_set(i, pr->performance->shared_cpu_map);
 731                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 732                 }
 733                 pr->performance = NULL; /* Will be set for real in register */
 734         }
 735
 736         mutex_unlock(&performance_mutex);
 737         return retval;
 738 }
 739 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 740
 741
 742 int
 743 acpi_processor_register_performance(struct acpi_processor_performance
 744                                     *performance, unsigned int cpu)
 745 {
 746         struct acpi_processor *pr;
 747
 748
 749         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 750                 return -EINVAL;
 751
 752         mutex_lock(&performance_mutex);
 753
 754         pr = per_cpu(processors, cpu);
 755         if (!pr) {
 756                 mutex_unlock(&performance_mutex);
 757                 return -ENODEV;
 758         }
 759
 760         if (pr->performance) {
 761                 mutex_unlock(&performance_mutex);
 762                 return -EBUSY;
 763         }
 764
 765         WARN_ON(!performance);
 766
 767         pr->performance = performance;
 768
 769         if (acpi_processor_get_performance_info(pr)) {
 770                 pr->performance = NULL;
 771                 mutex_unlock(&performance_mutex);
 772                 return -EIO;
 773         }
 774
 775         acpi_cpufreq_add_file(pr);
 776
 777         mutex_unlock(&performance_mutex);
 778         return 0;
 779 }
 780
 781 EXPORT_SYMBOL(acpi_processor_register_performance);
 782
 783 void
 784 acpi_processor_unregister_performance(struct acpi_processor_performance
 785                                       *performance, unsigned int cpu)
 786 {
 787         struct acpi_processor *pr;
 788
 789
 790         mutex_lock(&performance_mutex);
 791
 792         pr = per_cpu(processors, cpu);
 793         if (!pr) {
 794                 mutex_unlock(&performance_mutex);
 795                 return;
 796         }
 797
 798         if (pr->performance)
 799                 kfree(pr->performance->states);
 800         pr->performance = NULL;
 801
 802         acpi_cpufreq_remove_file(pr);
 803
 804         mutex_unlock(&performance_mutex);
 805
 806         return;
 807 }
 808
 809 EXPORT_SYMBOL(acpi_processor_unregister_performance);