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