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