drivers/acpi/processor_perflib.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   8  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   9  *                      - Added processor hotplug support
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/cpufreq.h>
  16 #include <linux/slab.h>
  17 #include <linux/acpi.h>
  18 #include <acpi/processor.h>
  19 #ifdef CONFIG_X86
  20 #include <asm/cpufeature.h>
  21 #endif
  22
  23 #define PREFIX "ACPI: "
  24
  25 #define ACPI_PROCESSOR_CLASS            "processor"
  26 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  27 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  28 ACPI_MODULE_NAME("processor_perflib");
  29
  30 static DEFINE_MUTEX(performance_mutex);
  31
  32 /*
  33  * _PPC support is implemented as a CPUfreq policy notifier:
  34  * This means each time a CPUfreq driver registered also with
  35  * the ACPI core is asked to change the speed policy, the maximum
  36  * value is adjusted so that it is within the platform limit.
  37  *
  38  * Also, when a new platform limit value is detected, the CPUfreq
  39  * policy is adjusted accordingly.
  40  */
  41
  42 /* ignore_ppc:
  43  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  44  *       ignore _PPC
  45  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  46  *  1 -> ignore _PPC totally -> forced by user through boot param
  47  */
  48 static int ignore_ppc = -1;
  49 module_param(ignore_ppc, int, 0644);
  50 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  51                  "limited by BIOS, this should help");
  52
  53 #define PPC_REGISTERED   1
  54 #define PPC_IN_USE       2
  55
  56 static int acpi_processor_ppc_status;
  57
  58 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  59                                        unsigned long event, void *data)
  60 {
  61         struct cpufreq_policy *policy = data;
  62         struct acpi_processor *pr;
  63         unsigned int ppc = 0;
  64
  65         if (ignore_ppc < 0)
  66                 ignore_ppc = 0;
  67
  68         if (ignore_ppc)
  69                 return 0;
  70
  71         if (event != CPUFREQ_ADJUST)
  72                 return 0;
  73
  74         mutex_lock(&performance_mutex);
  75
  76         pr = per_cpu(processors, policy->cpu);
  77         if (!pr || !pr->performance)
  78                 goto out;
  79
  80         ppc = (unsigned int)pr->performance_platform_limit;
  81
  82         if (ppc >= pr->performance->state_count)
  83                 goto out;
  84
  85         cpufreq_verify_within_limits(policy, 0,
  86                                      pr->performance->states[ppc].
  87                                      core_frequency * 1000);
  88
  89       out:
  90         mutex_unlock(&performance_mutex);
  91
  92         return 0;
  93 }
  94
  95 static struct notifier_block acpi_ppc_notifier_block = {
  96         .notifier_call = acpi_processor_ppc_notifier,
  97 };
  98
  99 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 100 {
 101         acpi_status status = 0;
 102         unsigned long long ppc = 0;
 103
 104
 105         if (!pr)
 106                 return -EINVAL;
 107
 108         /*
 109          * _PPC indicates the maximum state currently supported by the platform
 110          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 111          */
 112         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 113
 114         if (status != AE_NOT_FOUND)
 115                 acpi_processor_ppc_status |= PPC_IN_USE;
 116
 117         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 118                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 119                 return -ENODEV;
 120         }
 121
 122         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 123                        (int)ppc, ppc ? "" : "not");
 124
 125         pr->performance_platform_limit = (int)ppc;
 126
 127         return 0;
 128 }
 129
 130 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 131 /*
 132  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 133  * @handle: ACPI processor handle
 134  * @status: the status code of _PPC evaluation
 135  *      0: success. OSPM is now using the performance state specificed.
 136  *      1: failure. OSPM has not changed the number of P-states in use
 137  */
 138 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 139 {
 140         if (acpi_has_method(handle, "_OST"))
 141                 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
 142                                   status, NULL);
 143 }
 144
 145 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 146 {
 147         int ret;
 148
 149         if (ignore_ppc || !pr->performance) {
 150                 /*
 151                  * Only when it is notification event, the _OST object
 152                  * will be evaluated. Otherwise it is skipped.
 153                  */
 154                 if (event_flag)
 155                         acpi_processor_ppc_ost(pr->handle, 1);
 156                 return;
 157         }
 158
 159         ret = acpi_processor_get_platform_limit(pr);
 160         /*
 161          * Only when it is notification event, the _OST object
 162          * will be evaluated. Otherwise it is skipped.
 163          */
 164         if (event_flag) {
 165                 if (ret < 0)
 166                         acpi_processor_ppc_ost(pr->handle, 1);
 167                 else
 168                         acpi_processor_ppc_ost(pr->handle, 0);
 169         }
 170         if (ret >= 0)
 171                 cpufreq_update_limits(pr->id);
 172 }
 173
 174 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 175 {
 176         struct acpi_processor *pr;
 177
 178         pr = per_cpu(processors, cpu);
 179         if (!pr || !pr->performance || !pr->performance->state_count)
 180                 return -ENODEV;
 181         *limit = pr->performance->states[pr->performance_platform_limit].
 182                 core_frequency * 1000;
 183         return 0;
 184 }
 185 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 186
 187 void acpi_processor_ppc_init(void)
 188 {
 189         if (!cpufreq_register_notifier
 190             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 191                 acpi_processor_ppc_status |= PPC_REGISTERED;
 192         else
 193                 printk(KERN_DEBUG
 194                        "Warning: Processor Platform Limit not supported.\n");
 195 }
 196
 197 void acpi_processor_ppc_exit(void)
 198 {
 199         if (acpi_processor_ppc_status & PPC_REGISTERED)
 200                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 201                                             CPUFREQ_POLICY_NOTIFIER);
 202
 203         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 204 }
 205
 206 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 207 {
 208         int result = 0;
 209         acpi_status status = 0;
 210         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 211         union acpi_object *pct = NULL;
 212         union acpi_object obj = { 0 };
 213
 214
 215         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 216         if (ACPI_FAILURE(status)) {
 217                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 218                 return -ENODEV;
 219         }
 220
 221         pct = (union acpi_object *)buffer.pointer;
 222         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 223             || (pct->package.count != 2)) {
 224                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 225                 result = -EFAULT;
 226                 goto end;
 227         }
 228
 229         /*
 230          * control_register
 231          */
 232
 233         obj = pct->package.elements[0];
 234
 235         if ((obj.type != ACPI_TYPE_BUFFER)
 236             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 237             || (obj.buffer.pointer == NULL)) {
 238                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 239                 result = -EFAULT;
 240                 goto end;
 241         }
 242         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 243                sizeof(struct acpi_pct_register));
 244
 245         /*
 246          * status_register
 247          */
 248
 249         obj = pct->package.elements[1];
 250
 251         if ((obj.type != ACPI_TYPE_BUFFER)
 252             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 253             || (obj.buffer.pointer == NULL)) {
 254                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 255                 result = -EFAULT;
 256                 goto end;
 257         }
 258
 259         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 260                sizeof(struct acpi_pct_register));
 261
 262       end:
 263         kfree(buffer.pointer);
 264
 265         return result;
 266 }
 267
 268 #ifdef CONFIG_X86
 269 /*
 270  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 271  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 272  */
 273 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 274 {
 275         u32 hi, lo, fid, did;
 276         int index = px->control & 0x00000007;
 277
 278         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 279                 return;
 280
 281         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 282             || boot_cpu_data.x86 == 0x11) {
 283                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 284                 /*
 285                  * MSR C001_0064+:
 286                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 287                  */
 288                 if (!(hi & BIT(31)))
 289                         return;
 290
 291                 fid = lo & 0x3f;
 292                 did = (lo >> 6) & 7;
 293                 if (boot_cpu_data.x86 == 0x10)
 294                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 295                 else
 296                         px->core_frequency = (100 * (fid + 8)) >> did;
 297         }
 298 }
 299 #else
 300 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 301 #endif
 302
 303 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 304 {
 305         int result = 0;
 306         acpi_status status = AE_OK;
 307         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 308         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 309         struct acpi_buffer state = { 0, NULL };
 310         union acpi_object *pss = NULL;
 311         int i;
 312         int last_invalid = -1;
 313
 314
 315         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 316         if (ACPI_FAILURE(status)) {
 317                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 318                 return -ENODEV;
 319         }
 320
 321         pss = buffer.pointer;
 322         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 323                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 324                 result = -EFAULT;
 325                 goto end;
 326         }
 327
 328         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 329                           pss->package.count));
 330
 331         pr->performance->state_count = pss->package.count;
 332         pr->performance->states =
 333             kmalloc_array(pss->package.count,
 334                           sizeof(struct acpi_processor_px),
 335                           GFP_KERNEL);
 336         if (!pr->performance->states) {
 337                 result = -ENOMEM;
 338                 goto end;
 339         }
 340
 341         for (i = 0; i < pr->performance->state_count; i++) {
 342
 343                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 344
 345                 state.length = sizeof(struct acpi_processor_px);
 346                 state.pointer = px;
 347
 348                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 349
 350                 status = acpi_extract_package(&(pss->package.elements[i]),
 351                                               &format, &state);
 352                 if (ACPI_FAILURE(status)) {
 353                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 354                         result = -EFAULT;
 355                         kfree(pr->performance->states);
 356                         goto end;
 357                 }
 358
 359                 amd_fixup_frequency(px, i);
 360
 361                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 362                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 363                                   i,
 364                                   (u32) px->core_frequency,
 365                                   (u32) px->power,
 366                                   (u32) px->transition_latency,
 367                                   (u32) px->bus_master_latency,
 368                                   (u32) px->control, (u32) px->status));
 369
 370                 /*
 371                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 372                  */
 373                 if (!px->core_frequency ||
 374                     ((u32)(px->core_frequency * 1000) !=
 375                      (px->core_frequency * 1000))) {
 376                         printk(KERN_ERR FW_BUG PREFIX
 377                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 378                                pr->id, px->core_frequency);
 379                         if (last_invalid == -1)
 380                                 last_invalid = i;
 381                 } else {
 382                         if (last_invalid != -1) {
 383                                 /*
 384                                  * Copy this valid entry over last_invalid entry
 385                                  */
 386                                 memcpy(&(pr->performance->states[last_invalid]),
 387                                        px, sizeof(struct acpi_processor_px));
 388                                 ++last_invalid;
 389                         }
 390                 }
 391         }
 392
 393         if (last_invalid == 0) {
 394                 printk(KERN_ERR FW_BUG PREFIX
 395                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 396                 result = -EFAULT;
 397                 kfree(pr->performance->states);
 398                 pr->performance->states = NULL;
 399         }
 400
 401         if (last_invalid > 0)
 402                 pr->performance->state_count = last_invalid;
 403
 404       end:
 405         kfree(buffer.pointer);
 406
 407         return result;
 408 }
 409
 410 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 411 {
 412         int result = 0;
 413
 414         if (!pr || !pr->performance || !pr->handle)
 415                 return -EINVAL;
 416
 417         if (!acpi_has_method(pr->handle, "_PCT")) {
 418                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 419                                   "ACPI-based processor performance control unavailable\n"));
 420                 return -ENODEV;
 421         }
 422
 423         result = acpi_processor_get_performance_control(pr);
 424         if (result)
 425                 goto update_bios;
 426
 427         result = acpi_processor_get_performance_states(pr);
 428         if (result)
 429                 goto update_bios;
 430
 431         /* We need to call _PPC once when cpufreq starts */
 432         if (ignore_ppc != 1)
 433                 result = acpi_processor_get_platform_limit(pr);
 434
 435         return result;
 436
 437         /*
 438          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 439          * the BIOS is older than the CPU and does not know its frequencies
 440          */
 441  update_bios:
 442 #ifdef CONFIG_X86
 443         if (acpi_has_method(pr->handle, "_PPC")) {
 444                 if(boot_cpu_has(X86_FEATURE_EST))
 445                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 446                                "frequency support\n");
 447         }
 448 #endif
 449         return result;
 450 }
 451 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 452
 453 int acpi_processor_pstate_control(void)
 454 {
 455         acpi_status status;
 456
 457         if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
 458                 return 0;
 459
 460         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 461                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 462                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 463
 464         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 465                                     (u32)acpi_gbl_FADT.pstate_control, 8);
 466         if (ACPI_SUCCESS(status))
 467                 return 1;
 468
 469         ACPI_EXCEPTION((AE_INFO, status,
 470                         "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
 471                         acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 472         return -EIO;
 473 }
 474
 475 int acpi_processor_notify_smm(struct module *calling_module)
 476 {
 477         static int is_done = 0;
 478         int result;
 479
 480         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 481                 return -EBUSY;
 482
 483         if (!try_module_get(calling_module))
 484                 return -EINVAL;
 485
 486         /* is_done is set to negative if an error occurred,
 487          * and to postitive if _no_ error occurred, but SMM
 488          * was already notified. This avoids double notification
 489          * which might lead to unexpected results...
 490          */
 491         if (is_done > 0) {
 492                 module_put(calling_module);
 493                 return 0;
 494         } else if (is_done < 0) {
 495                 module_put(calling_module);
 496                 return is_done;
 497         }
 498
 499         is_done = -EIO;
 500
 501         result = acpi_processor_pstate_control();
 502         if (!result) {
 503                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 504                 module_put(calling_module);
 505                 return 0;
 506         }
 507         if (result < 0) {
 508                 module_put(calling_module);
 509                 return result;
 510         }
 511
 512         /* Success. If there's no _PPC, we need to fear nothing, so
 513          * we can allow the cpufreq driver to be rmmod'ed. */
 514         is_done = 1;
 515
 516         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 517                 module_put(calling_module);
 518
 519         return 0;
 520 }
 521
 522 EXPORT_SYMBOL(acpi_processor_notify_smm);
 523
 524 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
 525 {
 526         int result = 0;
 527         acpi_status status = AE_OK;
 528         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 529         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 530         struct acpi_buffer state = {0, NULL};
 531         union acpi_object  *psd = NULL;
 532
 533         status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
 534         if (ACPI_FAILURE(status)) {
 535                 return -ENODEV;
 536         }
 537
 538         psd = buffer.pointer;
 539         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 540                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 541                 result = -EFAULT;
 542                 goto end;
 543         }
 544
 545         if (psd->package.count != 1) {
 546                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 547                 result = -EFAULT;
 548                 goto end;
 549         }
 550
 551         state.length = sizeof(struct acpi_psd_package);
 552         state.pointer = pdomain;
 553
 554         status = acpi_extract_package(&(psd->package.elements[0]),
 555                 &format, &state);
 556         if (ACPI_FAILURE(status)) {
 557                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 558                 result = -EFAULT;
 559                 goto end;
 560         }
 561
 562         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 563                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 564                 result = -EFAULT;
 565                 goto end;
 566         }
 567
 568         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 569                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 570                 result = -EFAULT;
 571                 goto end;
 572         }
 573
 574         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 575             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 576             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 577                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 578                 result = -EFAULT;
 579                 goto end;
 580         }
 581 end:
 582         kfree(buffer.pointer);
 583         return result;
 584 }
 585 EXPORT_SYMBOL(acpi_processor_get_psd);
 586
 587 int acpi_processor_preregister_performance(
 588                 struct acpi_processor_performance __percpu *performance)
 589 {
 590         int count_target;
 591         int retval = 0;
 592         unsigned int i, j;
 593         cpumask_var_t covered_cpus;
 594         struct acpi_processor *pr;
 595         struct acpi_psd_package *pdomain;
 596         struct acpi_processor *match_pr;
 597         struct acpi_psd_package *match_pdomain;
 598
 599         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 600                 return -ENOMEM;
 601
 602         mutex_lock(&performance_mutex);
 603
 604         /*
 605          * Check if another driver has already registered, and abort before
 606          * changing pr->performance if it has. Check input data as well.
 607          */
 608         for_each_possible_cpu(i) {
 609                 pr = per_cpu(processors, i);
 610                 if (!pr) {
 611                         /* Look only at processors in ACPI namespace */
 612                         continue;
 613                 }
 614
 615                 if (pr->performance) {
 616                         retval = -EBUSY;
 617                         goto err_out;
 618                 }
 619
 620                 if (!performance || !per_cpu_ptr(performance, i)) {
 621                         retval = -EINVAL;
 622                         goto err_out;
 623                 }
 624         }
 625
 626         /* Call _PSD for all CPUs */
 627         for_each_possible_cpu(i) {
 628                 pr = per_cpu(processors, i);
 629                 if (!pr)
 630                         continue;
 631
 632                 pr->performance = per_cpu_ptr(performance, i);
 633                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 634                 pdomain = &(pr->performance->domain_info);
 635                 if (acpi_processor_get_psd(pr->handle, pdomain)) {
 636                         retval = -EINVAL;
 637                         continue;
 638                 }
 639         }
 640         if (retval)
 641                 goto err_ret;
 642
 643         /*
 644          * Now that we have _PSD data from all CPUs, lets setup P-state
 645          * domain info.
 646          */
 647         for_each_possible_cpu(i) {
 648                 pr = per_cpu(processors, i);
 649                 if (!pr)
 650                         continue;
 651
 652                 if (cpumask_test_cpu(i, covered_cpus))
 653                         continue;
 654
 655                 pdomain = &(pr->performance->domain_info);
 656                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 657                 cpumask_set_cpu(i, covered_cpus);
 658                 if (pdomain->num_processors <= 1)
 659                         continue;
 660
 661                 /* Validate the Domain info */
 662                 count_target = pdomain->num_processors;
 663                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 664                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 665                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 666                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 667                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 668                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 669
 670                 for_each_possible_cpu(j) {
 671                         if (i == j)
 672                                 continue;
 673
 674                         match_pr = per_cpu(processors, j);
 675                         if (!match_pr)
 676                                 continue;
 677
 678                         match_pdomain = &(match_pr->performance->domain_info);
 679                         if (match_pdomain->domain != pdomain->domain)
 680                                 continue;
 681
 682                         /* Here i and j are in the same domain */
 683
 684                         if (match_pdomain->num_processors != count_target) {
 685                                 retval = -EINVAL;
 686                                 goto err_ret;
 687                         }
 688
 689                         if (pdomain->coord_type != match_pdomain->coord_type) {
 690                                 retval = -EINVAL;
 691                                 goto err_ret;
 692                         }
 693
 694                         cpumask_set_cpu(j, covered_cpus);
 695                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 696                 }
 697
 698                 for_each_possible_cpu(j) {
 699                         if (i == j)
 700                                 continue;
 701
 702                         match_pr = per_cpu(processors, j);
 703                         if (!match_pr)
 704                                 continue;
 705
 706                         match_pdomain = &(match_pr->performance->domain_info);
 707                         if (match_pdomain->domain != pdomain->domain)
 708                                 continue;
 709
 710                         match_pr->performance->shared_type =
 711                                         pr->performance->shared_type;
 712                         cpumask_copy(match_pr->performance->shared_cpu_map,
 713                                      pr->performance->shared_cpu_map);
 714                 }
 715         }
 716
 717 err_ret:
 718         for_each_possible_cpu(i) {
 719                 pr = per_cpu(processors, i);
 720                 if (!pr || !pr->performance)
 721                         continue;
 722
 723                 /* Assume no coordination on any error parsing domain info */
 724                 if (retval) {
 725                         cpumask_clear(pr->performance->shared_cpu_map);
 726                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 727                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 728                 }
 729                 pr->performance = NULL; /* Will be set for real in register */
 730         }
 731
 732 err_out:
 733         mutex_unlock(&performance_mutex);
 734         free_cpumask_var(covered_cpus);
 735         return retval;
 736 }
 737 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 738
 739 int
 740 acpi_processor_register_performance(struct acpi_processor_performance
 741                                     *performance, unsigned int cpu)
 742 {
 743         struct acpi_processor *pr;
 744
 745         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 746                 return -EINVAL;
 747
 748         mutex_lock(&performance_mutex);
 749
 750         pr = per_cpu(processors, cpu);
 751         if (!pr) {
 752                 mutex_unlock(&performance_mutex);
 753                 return -ENODEV;
 754         }
 755
 756         if (pr->performance) {
 757                 mutex_unlock(&performance_mutex);
 758                 return -EBUSY;
 759         }
 760
 761         WARN_ON(!performance);
 762
 763         pr->performance = performance;
 764
 765         if (acpi_processor_get_performance_info(pr)) {
 766                 pr->performance = NULL;
 767                 mutex_unlock(&performance_mutex);
 768                 return -EIO;
 769         }
 770
 771         mutex_unlock(&performance_mutex);
 772         return 0;
 773 }
 774
 775 EXPORT_SYMBOL(acpi_processor_register_performance);
 776
 777 void acpi_processor_unregister_performance(unsigned int cpu)
 778 {
 779         struct acpi_processor *pr;
 780
 781         mutex_lock(&performance_mutex);
 782
 783         pr = per_cpu(processors, cpu);
 784         if (!pr) {
 785                 mutex_unlock(&performance_mutex);
 786                 return;
 787         }
 788
 789         if (pr->performance)
 790                 kfree(pr->performance->states);
 791         pr->performance = NULL;
 792
 793         mutex_unlock(&performance_mutex);
 794
 795         return;
 796 }
 797
 798 EXPORT_SYMBOL(acpi_processor_unregister_performance);