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 #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         *limit = pr->performance->states[pr->performance_platform_limit].
 146                 core_frequency * 1000;
 147         return 0;
 148 }
 149 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 150
 151 void acpi_processor_ignore_ppc_init(void)
 152 {
 153         if (ignore_ppc < 0)
 154                 ignore_ppc = 0;
 155 }
 156
 157 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
 158 {
 159         unsigned int cpu;
 160
 161         for_each_cpu(cpu, policy->related_cpus) {
 162                 struct acpi_processor *pr = per_cpu(processors, cpu);
 163                 int ret;
 164
 165                 if (!pr)
 166                         continue;
 167
 168                 ret = freq_qos_add_request(&policy->constraints,
 169                                            &pr->perflib_req,
 170                                            FREQ_QOS_MAX, INT_MAX);
 171                 if (ret < 0)
 172                         pr_err("Failed to add freq constraint for CPU%d (%d)\n",
 173                                cpu, ret);
 174         }
 175 }
 176
 177 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
 178 {
 179         unsigned int cpu;
 180
 181         for_each_cpu(cpu, policy->related_cpus) {
 182                 struct acpi_processor *pr = per_cpu(processors, cpu);
 183
 184                 if (pr)
 185                         freq_qos_remove_request(&pr->perflib_req);
 186         }
 187 }
 188
 189 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 190 {
 191         int result = 0;
 192         acpi_status status = 0;
 193         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 194         union acpi_object *pct = NULL;
 195         union acpi_object obj = { 0 };
 196
 197         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 198         if (ACPI_FAILURE(status)) {
 199                 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
 200                 return -ENODEV;
 201         }
 202
 203         pct = (union acpi_object *)buffer.pointer;
 204         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 205             || (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.type != ACPI_TYPE_BUFFER)
 218             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 219             || (obj.buffer.pointer == NULL)) {
 220                 pr_err("Invalid _PCT data (control_register)\n");
 221                 result = -EFAULT;
 222                 goto end;
 223         }
 224         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 225                sizeof(struct acpi_pct_register));
 226
 227         /*
 228          * status_register
 229          */
 230
 231         obj = pct->package.elements[1];
 232
 233         if ((obj.type != ACPI_TYPE_BUFFER)
 234             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 235             || (obj.buffer.pointer == NULL)) {
 236                 pr_err("Invalid _PCT data (status_register)\n");
 237                 result = -EFAULT;
 238                 goto end;
 239         }
 240
 241         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 242                sizeof(struct acpi_pct_register));
 243
 244 end:
 245         kfree(buffer.pointer);
 246
 247         return result;
 248 }
 249
 250 #ifdef CONFIG_X86
 251 /*
 252  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 253  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 254  */
 255 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 256 {
 257         u32 hi, lo, fid, did;
 258         int index = px->control & 0x00000007;
 259
 260         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 261                 return;
 262
 263         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 264             || boot_cpu_data.x86 == 0x11) {
 265                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 266                 /*
 267                  * MSR C001_0064+:
 268                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 269                  */
 270                 if (!(hi & BIT(31)))
 271                         return;
 272
 273                 fid = lo & 0x3f;
 274                 did = (lo >> 6) & 7;
 275                 if (boot_cpu_data.x86 == 0x10)
 276                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 277                 else
 278                         px->core_frequency = (100 * (fid + 8)) >> did;
 279         }
 280 }
 281 #else
 282 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 283 #endif
 284
 285 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 286 {
 287         int result = 0;
 288         acpi_status status = AE_OK;
 289         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 290         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 291         struct acpi_buffer state = { 0, NULL };
 292         union acpi_object *pss = NULL;
 293         int i;
 294         int last_invalid = -1;
 295
 296         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 297         if (ACPI_FAILURE(status)) {
 298                 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
 299                 return -ENODEV;
 300         }
 301
 302         pss = buffer.pointer;
 303         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 304                 pr_err("Invalid _PSS data\n");
 305                 result = -EFAULT;
 306                 goto end;
 307         }
 308
 309         acpi_handle_debug(pr->handle, "Found %d performance states\n",
 310                           pss->package.count);
 311
 312         pr->performance->state_count = pss->package.count;
 313         pr->performance->states =
 314             kmalloc_array(pss->package.count,
 315                           sizeof(struct acpi_processor_px),
 316                           GFP_KERNEL);
 317         if (!pr->performance->states) {
 318                 result = -ENOMEM;
 319                 goto end;
 320         }
 321
 322         for (i = 0; i < pr->performance->state_count; i++) {
 323
 324                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 325
 326                 state.length = sizeof(struct acpi_processor_px);
 327                 state.pointer = px;
 328
 329                 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
 330
 331                 status = acpi_extract_package(&(pss->package.elements[i]),
 332                                               &format, &state);
 333                 if (ACPI_FAILURE(status)) {
 334                         acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
 335                                          acpi_format_exception(status));
 336                         result = -EFAULT;
 337                         kfree(pr->performance->states);
 338                         goto end;
 339                 }
 340
 341                 amd_fixup_frequency(px, i);
 342
 343                 acpi_handle_debug(pr->handle,
 344                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 345                                   i,
 346                                   (u32) px->core_frequency,
 347                                   (u32) px->power,
 348                                   (u32) px->transition_latency,
 349                                   (u32) px->bus_master_latency,
 350                                   (u32) px->control, (u32) px->status);
 351
 352                 /*
 353                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 354                  */
 355                 if (!px->core_frequency ||
 356                     ((u32)(px->core_frequency * 1000) !=
 357                      (px->core_frequency * 1000))) {
 358                         pr_err(FW_BUG
 359                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 360                                pr->id, px->core_frequency);
 361                         if (last_invalid == -1)
 362                                 last_invalid = i;
 363                 } else {
 364                         if (last_invalid != -1) {
 365                                 /*
 366                                  * Copy this valid entry over last_invalid entry
 367                                  */
 368                                 memcpy(&(pr->performance->states[last_invalid]),
 369                                        px, sizeof(struct acpi_processor_px));
 370                                 ++last_invalid;
 371                         }
 372                 }
 373         }
 374
 375         if (last_invalid == 0) {
 376                 pr_err(FW_BUG
 377                            "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 378                 result = -EFAULT;
 379                 kfree(pr->performance->states);
 380                 pr->performance->states = NULL;
 381         }
 382
 383         if (last_invalid > 0)
 384                 pr->performance->state_count = last_invalid;
 385
 386 end:
 387         kfree(buffer.pointer);
 388
 389         return result;
 390 }
 391
 392 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 393 {
 394         int result = 0;
 395
 396         if (!pr || !pr->performance || !pr->handle)
 397                 return -EINVAL;
 398
 399         if (!acpi_has_method(pr->handle, "_PCT")) {
 400                 acpi_handle_debug(pr->handle,
 401                                   "ACPI-based processor performance control unavailable\n");
 402                 return -ENODEV;
 403         }
 404
 405         result = acpi_processor_get_performance_control(pr);
 406         if (result)
 407                 goto update_bios;
 408
 409         result = acpi_processor_get_performance_states(pr);
 410         if (result)
 411                 goto update_bios;
 412
 413         /* We need to call _PPC once when cpufreq starts */
 414         if (ignore_ppc != 1)
 415                 result = acpi_processor_get_platform_limit(pr);
 416
 417         return result;
 418
 419         /*
 420          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 421          * the BIOS is older than the CPU and does not know its frequencies
 422          */
 423  update_bios:
 424 #ifdef CONFIG_X86
 425         if (acpi_has_method(pr->handle, "_PPC")) {
 426                 if(boot_cpu_has(X86_FEATURE_EST))
 427                         pr_warn(FW_BUG "BIOS needs update for CPU "
 428                                "frequency support\n");
 429         }
 430 #endif
 431         return result;
 432 }
 433 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 434
 435 int acpi_processor_pstate_control(void)
 436 {
 437         acpi_status status;
 438
 439         if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
 440                 return 0;
 441
 442         pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 443                  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
 444
 445         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 446                                     (u32)acpi_gbl_FADT.pstate_control, 8);
 447         if (ACPI_SUCCESS(status))
 448                 return 1;
 449
 450         pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
 451                 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
 452                 acpi_format_exception(status));
 453         return -EIO;
 454 }
 455
 456 int acpi_processor_notify_smm(struct module *calling_module)
 457 {
 458         static int is_done;
 459         int result;
 460
 461         if (!acpi_processor_cpufreq_init)
 462                 return -EBUSY;
 463
 464         if (!try_module_get(calling_module))
 465                 return -EINVAL;
 466
 467         /* is_done is set to negative if an error occurred,
 468          * and to postitive if _no_ error occurred, but SMM
 469          * was already notified. This avoids double notification
 470          * which might lead to unexpected results...
 471          */
 472         if (is_done > 0) {
 473                 module_put(calling_module);
 474                 return 0;
 475         } else if (is_done < 0) {
 476                 module_put(calling_module);
 477                 return is_done;
 478         }
 479
 480         is_done = -EIO;
 481
 482         result = acpi_processor_pstate_control();
 483         if (!result) {
 484                 pr_debug("No SMI port or pstate_control\n");
 485                 module_put(calling_module);
 486                 return 0;
 487         }
 488         if (result < 0) {
 489                 module_put(calling_module);
 490                 return result;
 491         }
 492
 493         /* Success. If there's no _PPC, we need to fear nothing, so
 494          * we can allow the cpufreq driver to be rmmod'ed. */
 495         is_done = 1;
 496
 497         if (!acpi_processor_ppc_in_use)
 498                 module_put(calling_module);
 499
 500         return 0;
 501 }
 502
 503 EXPORT_SYMBOL(acpi_processor_notify_smm);
 504
 505 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
 506 {
 507         int result = 0;
 508         acpi_status status = AE_OK;
 509         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 510         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 511         struct acpi_buffer state = {0, NULL};
 512         union acpi_object  *psd = NULL;
 513
 514         status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
 515         if (ACPI_FAILURE(status)) {
 516                 return -ENODEV;
 517         }
 518
 519         psd = buffer.pointer;
 520         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 521                 pr_err("Invalid _PSD data\n");
 522                 result = -EFAULT;
 523                 goto end;
 524         }
 525
 526         if (psd->package.count != 1) {
 527                 pr_err("Invalid _PSD data\n");
 528                 result = -EFAULT;
 529                 goto end;
 530         }
 531
 532         state.length = sizeof(struct acpi_psd_package);
 533         state.pointer = pdomain;
 534
 535         status = acpi_extract_package(&(psd->package.elements[0]),
 536                 &format, &state);
 537         if (ACPI_FAILURE(status)) {
 538                 pr_err("Invalid _PSD data\n");
 539                 result = -EFAULT;
 540                 goto end;
 541         }
 542
 543         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 544                 pr_err("Unknown _PSD:num_entries\n");
 545                 result = -EFAULT;
 546                 goto end;
 547         }
 548
 549         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 550                 pr_err("Unknown _PSD:revision\n");
 551                 result = -EFAULT;
 552                 goto end;
 553         }
 554
 555         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 556             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 557             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 558                 pr_err("Invalid _PSD:coord_type\n");
 559                 result = -EFAULT;
 560                 goto end;
 561         }
 562 end:
 563         kfree(buffer.pointer);
 564         return result;
 565 }
 566 EXPORT_SYMBOL(acpi_processor_get_psd);
 567
 568 int acpi_processor_preregister_performance(
 569                 struct acpi_processor_performance __percpu *performance)
 570 {
 571         int count_target;
 572         int retval = 0;
 573         unsigned int i, j;
 574         cpumask_var_t covered_cpus;
 575         struct acpi_processor *pr;
 576         struct acpi_psd_package *pdomain;
 577         struct acpi_processor *match_pr;
 578         struct acpi_psd_package *match_pdomain;
 579
 580         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 581                 return -ENOMEM;
 582
 583         mutex_lock(&performance_mutex);
 584
 585         /*
 586          * Check if another driver has already registered, and abort before
 587          * changing pr->performance if it has. Check input data as well.
 588          */
 589         for_each_possible_cpu(i) {
 590                 pr = per_cpu(processors, i);
 591                 if (!pr) {
 592                         /* Look only at processors in ACPI namespace */
 593                         continue;
 594                 }
 595
 596                 if (pr->performance) {
 597                         retval = -EBUSY;
 598                         goto err_out;
 599                 }
 600
 601                 if (!performance || !per_cpu_ptr(performance, i)) {
 602                         retval = -EINVAL;
 603                         goto err_out;
 604                 }
 605         }
 606
 607         /* Call _PSD for all CPUs */
 608         for_each_possible_cpu(i) {
 609                 pr = per_cpu(processors, i);
 610                 if (!pr)
 611                         continue;
 612
 613                 pr->performance = per_cpu_ptr(performance, i);
 614                 pdomain = &(pr->performance->domain_info);
 615                 if (acpi_processor_get_psd(pr->handle, pdomain)) {
 616                         retval = -EINVAL;
 617                         continue;
 618                 }
 619         }
 620         if (retval)
 621                 goto err_ret;
 622
 623         /*
 624          * Now that we have _PSD data from all CPUs, lets setup P-state
 625          * domain info.
 626          */
 627         for_each_possible_cpu(i) {
 628                 pr = per_cpu(processors, i);
 629                 if (!pr)
 630                         continue;
 631
 632                 if (cpumask_test_cpu(i, covered_cpus))
 633                         continue;
 634
 635                 pdomain = &(pr->performance->domain_info);
 636                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 637                 cpumask_set_cpu(i, covered_cpus);
 638                 if (pdomain->num_processors <= 1)
 639                         continue;
 640
 641                 /* Validate the Domain info */
 642                 count_target = pdomain->num_processors;
 643                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 645                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 646                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 647                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 648                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 649
 650                 for_each_possible_cpu(j) {
 651                         if (i == j)
 652                                 continue;
 653
 654                         match_pr = per_cpu(processors, j);
 655                         if (!match_pr)
 656                                 continue;
 657
 658                         match_pdomain = &(match_pr->performance->domain_info);
 659                         if (match_pdomain->domain != pdomain->domain)
 660                                 continue;
 661
 662                         /* Here i and j are in the same domain */
 663
 664                         if (match_pdomain->num_processors != count_target) {
 665                                 retval = -EINVAL;
 666                                 goto err_ret;
 667                         }
 668
 669                         if (pdomain->coord_type != match_pdomain->coord_type) {
 670                                 retval = -EINVAL;
 671                                 goto err_ret;
 672                         }
 673
 674                         cpumask_set_cpu(j, covered_cpus);
 675                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 676                 }
 677
 678                 for_each_possible_cpu(j) {
 679                         if (i == j)
 680                                 continue;
 681
 682                         match_pr = per_cpu(processors, j);
 683                         if (!match_pr)
 684                                 continue;
 685
 686                         match_pdomain = &(match_pr->performance->domain_info);
 687                         if (match_pdomain->domain != pdomain->domain)
 688                                 continue;
 689
 690                         match_pr->performance->shared_type =
 691                                         pr->performance->shared_type;
 692                         cpumask_copy(match_pr->performance->shared_cpu_map,
 693                                      pr->performance->shared_cpu_map);
 694                 }
 695         }
 696
 697 err_ret:
 698         for_each_possible_cpu(i) {
 699                 pr = per_cpu(processors, i);
 700                 if (!pr || !pr->performance)
 701                         continue;
 702
 703                 /* Assume no coordination on any error parsing domain info */
 704                 if (retval) {
 705                         cpumask_clear(pr->performance->shared_cpu_map);
 706                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 707                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
 708                 }
 709                 pr->performance = NULL; /* Will be set for real in register */
 710         }
 711
 712 err_out:
 713         mutex_unlock(&performance_mutex);
 714         free_cpumask_var(covered_cpus);
 715         return retval;
 716 }
 717 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 718
 719 int
 720 acpi_processor_register_performance(struct acpi_processor_performance
 721                                     *performance, unsigned int cpu)
 722 {
 723         struct acpi_processor *pr;
 724
 725         if (!acpi_processor_cpufreq_init)
 726                 return -EINVAL;
 727
 728         mutex_lock(&performance_mutex);
 729
 730         pr = per_cpu(processors, cpu);
 731         if (!pr) {
 732                 mutex_unlock(&performance_mutex);
 733                 return -ENODEV;
 734         }
 735
 736         if (pr->performance) {
 737                 mutex_unlock(&performance_mutex);
 738                 return -EBUSY;
 739         }
 740
 741         WARN_ON(!performance);
 742
 743         pr->performance = performance;
 744
 745         if (acpi_processor_get_performance_info(pr)) {
 746                 pr->performance = NULL;
 747                 mutex_unlock(&performance_mutex);
 748                 return -EIO;
 749         }
 750
 751         mutex_unlock(&performance_mutex);
 752         return 0;
 753 }
 754
 755 EXPORT_SYMBOL(acpi_processor_register_performance);
 756
 757 void acpi_processor_unregister_performance(unsigned int cpu)
 758 {
 759         struct acpi_processor *pr;
 760
 761         mutex_lock(&performance_mutex);
 762
 763         pr = per_cpu(processors, cpu);
 764         if (!pr) {
 765                 mutex_unlock(&performance_mutex);
 766                 return;
 767         }
 768
 769         if (pr->performance)
 770                 kfree(pr->performance->states);
 771         pr->performance = NULL;
 772
 773         mutex_unlock(&performance_mutex);
 774
 775         return;
 776 }
 777
 778 EXPORT_SYMBOL(acpi_processor_unregister_performance);