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