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