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 #include <linux/slab.h>
  34
  35 #ifdef CONFIG_X86
  36 #include <asm/cpufeature.h>
  37 #endif
  38
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <acpi/processor.h>
  42
  43 #define PREFIX "ACPI: "
  44
  45 #define ACPI_PROCESSOR_CLASS            "processor"
  46 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  47 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  48 ACPI_MODULE_NAME("processor_perflib");
  49
  50 static DEFINE_MUTEX(performance_mutex);
  51
  52 /*
  53  * _PPC support is implemented as a CPUfreq policy notifier:
  54  * This means each time a CPUfreq driver registered also with
  55  * the ACPI core is asked to change the speed policy, the maximum
  56  * value is adjusted so that it is within the platform limit.
  57  *
  58  * Also, when a new platform limit value is detected, the CPUfreq
  59  * policy is adjusted accordingly.
  60  */
  61
  62 /* ignore_ppc:
  63  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  64  *       ignore _PPC
  65  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  66  *  1 -> ignore _PPC totally -> forced by user through boot param
  67  */
  68 static int ignore_ppc = -1;
  69 module_param(ignore_ppc, int, 0644);
  70 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  71                  "limited by BIOS, this should help");
  72
  73 #define PPC_REGISTERED   1
  74 #define PPC_IN_USE       2
  75
  76 static int acpi_processor_ppc_status;
  77
  78 #ifdef CONFIG_CPU_FREQ
  79 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  80                                        unsigned long event, void *data)
  81 {
  82         struct cpufreq_policy *policy = data;
  83         struct acpi_processor *pr;
  84         unsigned int ppc = 0;
  85
  86         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  87                 ignore_ppc = 0;
  88                 return 0;
  89         }
  90
  91         if (ignore_ppc)
  92                 return 0;
  93
  94         if (event != CPUFREQ_INCOMPATIBLE)
  95                 return 0;
  96
  97         mutex_lock(&performance_mutex);
  98
  99         pr = per_cpu(processors, policy->cpu);
 100         if (!pr || !pr->performance)
 101                 goto out;
 102
 103         ppc = (unsigned int)pr->performance_platform_limit;
 104
 105         if (ppc >= pr->performance->state_count)
 106                 goto out;
 107
 108         cpufreq_verify_within_limits(policy, 0,
 109                                      pr->performance->states[ppc].
 110                                      core_frequency * 1000);
 111
 112       out:
 113         mutex_unlock(&performance_mutex);
 114
 115         return 0;
 116 }
 117
 118 static struct notifier_block acpi_ppc_notifier_block = {
 119         .notifier_call = acpi_processor_ppc_notifier,
 120 };
 121 #endif  /* CONFIG_CPU_FREQ */
 122
 123 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 124 {
 125         acpi_status status = 0;
 126         unsigned long long ppc = 0;
 127
 128
 129         if (!pr)
 130                 return -EINVAL;
 131
 132         /*
 133          * _PPC indicates the maximum state currently supported by the platform
 134          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 135          */
 136         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 137
 138         if (status != AE_NOT_FOUND)
 139                 acpi_processor_ppc_status |= PPC_IN_USE;
 140
 141         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 142                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 143                 return -ENODEV;
 144         }
 145
 146         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 147                        (int)ppc, ppc ? "" : "not");
 148
 149         pr->performance_platform_limit = (int)ppc;
 150
 151         return 0;
 152 }
 153
 154 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 155 /*
 156  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 157  * @handle: ACPI processor handle
 158  * @status: the status code of _PPC evaluation
 159  *      0: success. OSPM is now using the performance state specificed.
 160  *      1: failure. OSPM has not changed the number of P-states in use
 161  */
 162 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 163 {
 164         union acpi_object params[2] = {
 165                 {.type = ACPI_TYPE_INTEGER,},
 166                 {.type = ACPI_TYPE_INTEGER,},
 167         };
 168         struct acpi_object_list arg_list = {2, params};
 169         acpi_handle temp;
 170
 171         params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 172         params[1].integer.value =  status;
 173
 174         /* when there is no _OST , skip it */
 175         if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
 176                 return;
 177
 178         acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 179         return;
 180 }
 181
 182 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 183 {
 184         int ret;
 185
 186 #ifdef CONFIG_PROCESSOR_EXTERNAL_CONTROL
 187         /* Xen hypervisor can handle cpufreq _PPC event */
 188         if (ignore_ppc < 0 && processor_pmperf_external())
 189                 ignore_ppc = 0;
 190 #endif
 191
 192         if (ignore_ppc) {
 193                 /*
 194                  * Only when it is notification event, the _OST object
 195                  * will be evaluated. Otherwise it is skipped.
 196                  */
 197                 if (event_flag)
 198                         acpi_processor_ppc_ost(pr->handle, 1);
 199                 return 0;
 200         }
 201
 202         ret = acpi_processor_get_platform_limit(pr);
 203         /*
 204          * Only when it is notification event, the _OST object
 205          * will be evaluated. Otherwise it is skipped.
 206          */
 207         if (event_flag) {
 208                 if (ret < 0)
 209                         acpi_processor_ppc_ost(pr->handle, 1);
 210                 else
 211                         acpi_processor_ppc_ost(pr->handle, 0);
 212         }
 213         if (ret < 0)
 214                 return (ret);
 215         else
 216 #ifdef CONFIG_CPU_FREQ
 217                 return cpufreq_update_policy(pr->id);
 218 #elif defined(CONFIG_PROCESSOR_EXTERNAL_CONTROL)
 219                 return processor_notify_external(pr,
 220                                 PROCESSOR_PM_CHANGE, PM_TYPE_PERF);
 221 #endif
 222 }
 223
 224 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 225 {
 226         struct acpi_processor *pr;
 227
 228         pr = per_cpu(processors, cpu);
 229         if (!pr || !pr->performance || !pr->performance->state_count)
 230                 return -ENODEV;
 231         *limit = pr->performance->states[pr->performance_platform_limit].
 232                 core_frequency * 1000;
 233         return 0;
 234 }
 235 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 236
 237 #ifdef CONFIG_CPU_FREQ
 238 void acpi_processor_ppc_init(void)
 239 {
 240         if (!cpufreq_register_notifier
 241             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 242                 acpi_processor_ppc_status |= PPC_REGISTERED;
 243         else
 244                 printk(KERN_DEBUG
 245                        "Warning: Processor Platform Limit not supported.\n");
 246 }
 247
 248 void acpi_processor_ppc_exit(void)
 249 {
 250         if (acpi_processor_ppc_status & PPC_REGISTERED)
 251                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 252                                             CPUFREQ_POLICY_NOTIFIER);
 253
 254         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 255 }
 256
 257 /*
 258  * Do a quick check if the systems looks like it should use ACPI
 259  * cpufreq. We look at a _PCT method being available, but don't
 260  * do a whole lot of sanity checks.
 261  */
 262 void acpi_processor_load_module(struct acpi_processor *pr)
 263 {
 264         static int requested;
 265         acpi_status status = 0;
 266         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 267
 268         if (!arch_has_acpi_pdc() || requested)
 269                 return;
 270         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 271         if (!ACPI_FAILURE(status)) {
 272                 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
 273                 request_module_nowait("acpi_cpufreq");
 274                 requested = 1;
 275         }
 276         kfree(buffer.pointer);
 277 }
 278 #endif  /* CONFIG_CPU_FREQ */
 279
 280 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 281 {
 282         int result = 0;
 283         acpi_status status = 0;
 284         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 285         union acpi_object *pct = NULL;
 286         union acpi_object obj = { 0 };
 287
 288
 289         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 290         if (ACPI_FAILURE(status)) {
 291                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 292                 return -ENODEV;
 293         }
 294
 295         pct = (union acpi_object *)buffer.pointer;
 296         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 297             || (pct->package.count != 2)) {
 298                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 299                 result = -EFAULT;
 300                 goto end;
 301         }
 302
 303         /*
 304          * control_register
 305          */
 306
 307         obj = pct->package.elements[0];
 308
 309         if ((obj.type != ACPI_TYPE_BUFFER)
 310             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 311             || (obj.buffer.pointer == NULL)) {
 312                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 313                 result = -EFAULT;
 314                 goto end;
 315         }
 316         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 317                sizeof(struct acpi_pct_register));
 318
 319         /*
 320          * status_register
 321          */
 322
 323         obj = pct->package.elements[1];
 324
 325         if ((obj.type != ACPI_TYPE_BUFFER)
 326             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 327             || (obj.buffer.pointer == NULL)) {
 328                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 329                 result = -EFAULT;
 330                 goto end;
 331         }
 332
 333         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 334                sizeof(struct acpi_pct_register));
 335
 336       end:
 337         kfree(buffer.pointer);
 338
 339         return result;
 340 }
 341
 342 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 343 {
 344         int result = 0;
 345         acpi_status status = AE_OK;
 346         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 347         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 348         struct acpi_buffer state = { 0, NULL };
 349         union acpi_object *pss = NULL;
 350         int i;
 351
 352
 353         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 354         if (ACPI_FAILURE(status)) {
 355                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 356                 return -ENODEV;
 357         }
 358
 359         pss = buffer.pointer;
 360         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 361                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 362                 result = -EFAULT;
 363                 goto end;
 364         }
 365
 366         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 367                           pss->package.count));
 368
 369         pr->performance->state_count = pss->package.count;
 370         pr->performance->states =
 371             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 372                     GFP_KERNEL);
 373         if (!pr->performance->states) {
 374                 result = -ENOMEM;
 375                 goto end;
 376         }
 377
 378         for (i = 0; i < pr->performance->state_count; i++) {
 379
 380                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 381
 382                 state.length = sizeof(struct acpi_processor_px);
 383                 state.pointer = px;
 384
 385                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 386
 387                 status = acpi_extract_package(&(pss->package.elements[i]),
 388                                               &format, &state);
 389                 if (ACPI_FAILURE(status)) {
 390                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 391                         result = -EFAULT;
 392                         kfree(pr->performance->states);
 393                         goto end;
 394                 }
 395
 396                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 397                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 398                                   i,
 399                                   (u32) px->core_frequency,
 400                                   (u32) px->power,
 401                                   (u32) px->transition_latency,
 402                                   (u32) px->bus_master_latency,
 403                                   (u32) px->control, (u32) px->status));
 404
 405                 /*
 406                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 407                  */
 408                 if (!px->core_frequency ||
 409                     ((u32)(px->core_frequency * 1000) !=
 410                      (px->core_frequency * 1000))) {
 411                         printk(KERN_ERR FW_BUG PREFIX
 412                                "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
 413                                px->core_frequency);
 414                         result = -EFAULT;
 415                         kfree(pr->performance->states);
 416                         goto end;
 417                 }
 418         }
 419
 420       end:
 421         kfree(buffer.pointer);
 422
 423         return result;
 424 }
 425
 426 #ifndef CONFIG_PROCESSOR_EXTERNAL_CONTROL
 427 static
 428 #endif
 429 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 430 {
 431         int result = 0;
 432         acpi_status status = AE_OK;
 433         acpi_handle handle = NULL;
 434
 435         if (!pr || !pr->performance || !pr->handle)
 436                 return -EINVAL;
 437
 438         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 439         if (ACPI_FAILURE(status)) {
 440                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 441                                   "ACPI-based processor performance control unavailable\n"));
 442                 return -ENODEV;
 443         }
 444
 445         result = acpi_processor_get_performance_control(pr);
 446         if (result)
 447                 goto update_bios;
 448
 449         result = acpi_processor_get_performance_states(pr);
 450         if (result)
 451                 goto update_bios;
 452
 453         /* We need to call _PPC once when cpufreq starts */
 454         if (ignore_ppc != 1)
 455                 result = acpi_processor_get_platform_limit(pr);
 456
 457         return result;
 458
 459         /*
 460          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 461          * the BIOS is older than the CPU and does not know its frequencies
 462          */
 463  update_bios:
 464 #ifdef CONFIG_X86
 465         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 466                 if(boot_cpu_has(X86_FEATURE_EST))
 467                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 468                                "frequency support\n");
 469         }
 470 #endif
 471         return result;
 472 }
 473
 474 #ifdef CONFIG_CPU_FREQ
 475 int acpi_processor_notify_smm(struct module *calling_module)
 476 {
 477         acpi_status status;
 478         static int is_done = 0;
 479
 480
 481         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 482                 return -EBUSY;
 483
 484         if (!try_module_get(calling_module))
 485                 return -EINVAL;
 486
 487         /* is_done is set to negative if an error occurred,
 488          * and to postitive if _no_ error occurred, but SMM
 489          * was already notified. This avoids double notification
 490          * which might lead to unexpected results...
 491          */
 492         if (is_done > 0) {
 493                 module_put(calling_module);
 494                 return 0;
 495         } else if (is_done < 0) {
 496                 module_put(calling_module);
 497                 return is_done;
 498         }
 499
 500         is_done = -EIO;
 501
 502         /* Can't write pstate_control to smi_command if either value is zero */
 503         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 504                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 505                 module_put(calling_module);
 506                 return 0;
 507         }
 508
 509         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 510                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 511                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 512
 513         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 514                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 515         if (ACPI_FAILURE(status)) {
 516                 ACPI_EXCEPTION((AE_INFO, status,
 517                                 "Failed to write pstate_control [0x%x] to "
 518                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 519                                 acpi_gbl_FADT.smi_command));
 520                 module_put(calling_module);
 521                 return status;
 522         }
 523
 524         /* Success. If there's no _PPC, we need to fear nothing, so
 525          * we can allow the cpufreq driver to be rmmod'ed. */
 526         is_done = 1;
 527
 528         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 529                 module_put(calling_module);
 530
 531         return 0;
 532 }
 533
 534 EXPORT_SYMBOL(acpi_processor_notify_smm);
 535 #endif  /* CONFIG_CPU_FREQ */
 536
 537 #ifndef CONFIG_PROCESSOR_EXTERNAL_CONTROL
 538 static
 539 #endif
 540 int acpi_processor_get_psd(struct acpi_processor *pr)
 541 {
 542         int result = 0;
 543         acpi_status status = AE_OK;
 544         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 545         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 546         struct acpi_buffer state = {0, NULL};
 547         union acpi_object  *psd = NULL;
 548         struct acpi_psd_package *pdomain;
 549
 550         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 551         if (ACPI_FAILURE(status)) {
 552                 return -ENODEV;
 553         }
 554
 555         psd = buffer.pointer;
 556         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 557                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 558                 result = -EFAULT;
 559                 goto end;
 560         }
 561
 562         if (psd->package.count != 1) {
 563                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 564                 result = -EFAULT;
 565                 goto end;
 566         }
 567
 568         pdomain = &(pr->performance->domain_info);
 569
 570         state.length = sizeof(struct acpi_psd_package);
 571         state.pointer = pdomain;
 572
 573         status = acpi_extract_package(&(psd->package.elements[0]),
 574                 &format, &state);
 575         if (ACPI_FAILURE(status)) {
 576                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 577                 result = -EFAULT;
 578                 goto end;
 579         }
 580
 581         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 582                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 583                 result = -EFAULT;
 584                 goto end;
 585         }
 586
 587         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 588                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 589                 result = -EFAULT;
 590                 goto end;
 591         }
 592
 593         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 594             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 595             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 596                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 597                 result = -EFAULT;
 598                 goto end;
 599         }
 600 end:
 601         kfree(buffer.pointer);
 602         return result;
 603 }
 604
 605 #ifndef CONFIG_PROCESSOR_EXTERNAL_CONTROL
 606
 607 int acpi_processor_preregister_performance(
 608                 struct acpi_processor_performance __percpu *performance)
 609 {
 610         int count, count_target;
 611         int retval = 0;
 612         unsigned int i, j;
 613         cpumask_var_t covered_cpus;
 614         struct acpi_processor *pr;
 615         struct acpi_psd_package *pdomain;
 616         struct acpi_processor *match_pr;
 617         struct acpi_psd_package *match_pdomain;
 618
 619         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 620                 return -ENOMEM;
 621
 622         mutex_lock(&performance_mutex);
 623
 624         /*
 625          * Check if another driver has already registered, and abort before
 626          * changing pr->performance if it has. Check input data as well.
 627          */
 628         for_each_possible_cpu(i) {
 629                 pr = per_cpu(processors, i);
 630                 if (!pr) {
 631                         /* Look only at processors in ACPI namespace */
 632                         continue;
 633                 }
 634
 635                 if (pr->performance) {
 636                         retval = -EBUSY;
 637                         goto err_out;
 638                 }
 639
 640                 if (!performance || !per_cpu_ptr(performance, i)) {
 641                         retval = -EINVAL;
 642                         goto err_out;
 643                 }
 644         }
 645
 646         /* Call _PSD for all CPUs */
 647         for_each_possible_cpu(i) {
 648                 pr = per_cpu(processors, i);
 649                 if (!pr)
 650                         continue;
 651
 652                 pr->performance = per_cpu_ptr(performance, i);
 653                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 654                 if (acpi_processor_get_psd(pr)) {
 655                         retval = -EINVAL;
 656                         continue;
 657                 }
 658         }
 659         if (retval)
 660                 goto err_ret;
 661
 662         /*
 663          * Now that we have _PSD data from all CPUs, lets setup P-state
 664          * domain info.
 665          */
 666         for_each_possible_cpu(i) {
 667                 pr = per_cpu(processors, i);
 668                 if (!pr)
 669                         continue;
 670
 671                 if (cpumask_test_cpu(i, covered_cpus))
 672                         continue;
 673
 674                 pdomain = &(pr->performance->domain_info);
 675                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 676                 cpumask_set_cpu(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 = 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                         /* 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                         cpumask_set_cpu(j, covered_cpus);
 715                         cpumask_set_cpu(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 = per_cpu(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                         cpumask_copy(match_pr->performance->shared_cpu_map,
 734                                      pr->performance->shared_cpu_map);
 735                 }
 736         }
 737
 738 err_ret:
 739         for_each_possible_cpu(i) {
 740                 pr = per_cpu(processors, i);
 741                 if (!pr || !pr->performance)
 742                         continue;
 743
 744                 /* Assume no coordination on any error parsing domain info */
 745                 if (retval) {
 746                         cpumask_clear(pr->performance->shared_cpu_map);
 747                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 748                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 749                 }
 750                 pr->performance = NULL; /* Will be set for real in register */
 751         }
 752
 753 err_out:
 754         mutex_unlock(&performance_mutex);
 755         free_cpumask_var(covered_cpus);
 756         return retval;
 757 }
 758 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 759
 760 int
 761 acpi_processor_register_performance(struct acpi_processor_performance
 762                                     *performance, unsigned int cpu)
 763 {
 764         struct acpi_processor *pr;
 765
 766         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 767                 return -EINVAL;
 768
 769         mutex_lock(&performance_mutex);
 770
 771         pr = per_cpu(processors, cpu);
 772         if (!pr) {
 773                 mutex_unlock(&performance_mutex);
 774                 return -ENODEV;
 775         }
 776
 777         if (pr->performance) {
 778                 mutex_unlock(&performance_mutex);
 779                 return -EBUSY;
 780         }
 781
 782         WARN_ON(!performance);
 783
 784         pr->performance = performance;
 785
 786         if (acpi_processor_get_performance_info(pr)) {
 787                 pr->performance = NULL;
 788                 mutex_unlock(&performance_mutex);
 789                 return -EIO;
 790         }
 791
 792         mutex_unlock(&performance_mutex);
 793         return 0;
 794 }
 795
 796 EXPORT_SYMBOL(acpi_processor_register_performance);
 797
 798 void
 799 acpi_processor_unregister_performance(struct acpi_processor_performance
 800                                       *performance, unsigned int cpu)
 801 {
 802         struct acpi_processor *pr;
 803
 804         mutex_lock(&performance_mutex);
 805
 806         pr = per_cpu(processors, cpu);
 807         if (!pr) {
 808                 mutex_unlock(&performance_mutex);
 809                 return;
 810         }
 811
 812         if (pr->performance)
 813                 kfree(pr->performance->states);
 814         pr->performance = NULL;
 815
 816         mutex_unlock(&performance_mutex);
 817
 818         return;
 819 }
 820
 821 EXPORT_SYMBOL(acpi_processor_unregister_performance);
 822
 823 #endif /* !CONFIG_PROCESSOR_EXTERNAL_CONTROL */