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         s32 qos_value;
  60         int index;
  61         int ret;
  62
  63         if (!pr)
  64                 return -EINVAL;
  65
  66         /*
  67          * _PPC indicates the maximum state currently supported by the platform
  68          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
  69          */
  70         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
  71
  72         if (status != AE_NOT_FOUND)
  73                 acpi_processor_ppc_in_use = true;
  74
  75         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  76                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
  77                 return -ENODEV;
  78         }
  79
  80         index = ppc;
  81
  82         if (pr->performance_platform_limit == index ||
  83             ppc >= pr->performance->state_count)
  84                 return 0;
  85
  86         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
  87                  index, index ? "is" : "is not");
  88
  89         pr->performance_platform_limit = index;
  90
  91         if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
  92                 return 0;
  93
  94         /*
  95          * If _PPC returns 0, it means that all of the available states can be
  96          * used ("no limit").
  97          */
  98         if (index == 0)
  99                 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
 100         else
 101                 qos_value = pr->performance->states[index].core_frequency * 1000;
 102
 103         ret = freq_qos_update_request(&pr->perflib_req, qos_value);
 104         if (ret < 0) {
 105                 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
 106                         pr->id, ret);
 107         }
 108
 109         return 0;
 110 }
 111
 112 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 113 /*
 114  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 115  * @handle: ACPI processor handle
 116  * @status: the status code of _PPC evaluation
 117  *      0: success. OSPM is now using the performance state specificed.
 118  *      1: failure. OSPM has not changed the number of P-states in use
 119  */
 120 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 121 {
 122         if (acpi_has_method(handle, "_OST"))
 123                 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
 124                                   status, NULL);
 125 }
 126
 127 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 128 {
 129         int ret;
 130
 131         if (ignore_ppc || !pr->performance) {
 132                 /*
 133                  * Only when it is notification event, the _OST object
 134                  * will be evaluated. Otherwise it is skipped.
 135                  */
 136                 if (event_flag)
 137                         acpi_processor_ppc_ost(pr->handle, 1);
 138                 return;
 139         }
 140
 141         ret = acpi_processor_get_platform_limit(pr);
 142         /*
 143          * Only when it is notification event, the _OST object
 144          * will be evaluated. Otherwise it is skipped.
 145          */
 146         if (event_flag) {
 147                 if (ret < 0)
 148                         acpi_processor_ppc_ost(pr->handle, 1);
 149                 else
 150                         acpi_processor_ppc_ost(pr->handle, 0);
 151         }
 152         if (ret >= 0)
 153                 cpufreq_update_limits(pr->id);
 154 }
 155
 156 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 157 {
 158         struct acpi_processor *pr;
 159
 160         pr = per_cpu(processors, cpu);
 161         if (!pr || !pr->performance || !pr->performance->state_count)
 162                 return -ENODEV;
 163         *limit = pr->performance->states[pr->performance_platform_limit].
 164                 core_frequency * 1000;
 165         return 0;
 166 }
 167 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 168
 169 void acpi_processor_ignore_ppc_init(void)
 170 {
 171         if (ignore_ppc < 0)
 172                 ignore_ppc = 0;
 173 }
 174
 175 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
 176 {
 177         unsigned int cpu;
 178
 179         for_each_cpu(cpu, policy->related_cpus) {
 180                 struct acpi_processor *pr = per_cpu(processors, cpu);
 181                 int ret;
 182
 183                 if (!pr)
 184                         continue;
 185
 186                 /*
 187                  * Reset performance_platform_limit in case there is a stale
 188                  * value in it, so as to make it match the "no limit" QoS value
 189                  * below.
 190                  */
 191                 pr->performance_platform_limit = 0;
 192
 193                 ret = freq_qos_add_request(&policy->constraints,
 194                                            &pr->perflib_req, FREQ_QOS_MAX,
 195                                            FREQ_QOS_MAX_DEFAULT_VALUE);
 196                 if (ret < 0)
 197                         pr_err("Failed to add freq constraint for CPU%d (%d)\n",
 198                                cpu, ret);
 199         }
 200 }
 201
 202 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
 203 {
 204         unsigned int cpu;
 205
 206         for_each_cpu(cpu, policy->related_cpus) {
 207                 struct acpi_processor *pr = per_cpu(processors, cpu);
 208
 209                 if (pr)
 210                         freq_qos_remove_request(&pr->perflib_req);
 211         }
 212 }
 213
 214 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 215 {
 216         int result = 0;
 217         acpi_status status = 0;
 218         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 219         union acpi_object *pct = NULL;
 220         union acpi_object obj = { 0 };
 221
 222
 223         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 224         if (ACPI_FAILURE(status)) {
 225                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 226                 return -ENODEV;
 227         }
 228
 229         pct = (union acpi_object *)buffer.pointer;
 230         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 231             || (pct->package.count != 2)) {
 232                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 233                 result = -EFAULT;
 234                 goto end;
 235         }
 236
 237         /*
 238          * control_register
 239          */
 240
 241         obj = pct->package.elements[0];
 242
 243         if ((obj.type != ACPI_TYPE_BUFFER)
 244             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 245             || (obj.buffer.pointer == NULL)) {
 246                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 247                 result = -EFAULT;
 248                 goto end;
 249         }
 250         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 251                sizeof(struct acpi_pct_register));
 252
 253         /*
 254          * status_register
 255          */
 256
 257         obj = pct->package.elements[1];
 258
 259         if ((obj.type != ACPI_TYPE_BUFFER)
 260             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 261             || (obj.buffer.pointer == NULL)) {
 262                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 263                 result = -EFAULT;
 264                 goto end;
 265         }
 266
 267         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 268                sizeof(struct acpi_pct_register));
 269
 270       end:
 271         kfree(buffer.pointer);
 272
 273         return result;
 274 }
 275
 276 #ifdef CONFIG_X86
 277 /*
 278  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 279  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 280  */
 281 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 282 {
 283         u32 hi, lo, fid, did;
 284         int index = px->control & 0x00000007;
 285
 286         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 287                 return;
 288
 289         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 290             || boot_cpu_data.x86 == 0x11) {
 291                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 292                 /*
 293                  * MSR C001_0064+:
 294                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 295                  */
 296                 if (!(hi & BIT(31)))
 297                         return;
 298
 299                 fid = lo & 0x3f;
 300                 did = (lo >> 6) & 7;
 301                 if (boot_cpu_data.x86 == 0x10)
 302                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 303                 else
 304                         px->core_frequency = (100 * (fid + 8)) >> did;
 305         }
 306 }
 307 #else
 308 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 309 #endif
 310
 311 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 312 {
 313         int result = 0;
 314         acpi_status status = AE_OK;
 315         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 316         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 317         struct acpi_buffer state = { 0, NULL };
 318         union acpi_object *pss = NULL;
 319         int i;
 320         int last_invalid = -1;
 321
 322
 323         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 324         if (ACPI_FAILURE(status)) {
 325                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 326                 return -ENODEV;
 327         }
 328
 329         pss = buffer.pointer;
 330         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 331                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 332                 result = -EFAULT;
 333                 goto end;
 334         }
 335
 336         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 337                           pss->package.count));
 338
 339         pr->performance->state_count = pss->package.count;
 340         pr->performance->states =
 341             kmalloc_array(pss->package.count,
 342                           sizeof(struct acpi_processor_px),
 343                           GFP_KERNEL);
 344         if (!pr->performance->states) {
 345                 result = -ENOMEM;
 346                 goto end;
 347         }
 348
 349         for (i = 0; i < pr->performance->state_count; i++) {
 350
 351                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 352
 353                 state.length = sizeof(struct acpi_processor_px);
 354                 state.pointer = px;
 355
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 357
 358                 status = acpi_extract_package(&(pss->package.elements[i]),
 359                                               &format, &state);
 360                 if (ACPI_FAILURE(status)) {
 361                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 362                         result = -EFAULT;
 363                         kfree(pr->performance->states);
 364                         goto end;
 365                 }
 366
 367                 amd_fixup_frequency(px, i);
 368
 369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 370                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 371                                   i,
 372                                   (u32) px->core_frequency,
 373                                   (u32) px->power,
 374                                   (u32) px->transition_latency,
 375                                   (u32) px->bus_master_latency,
 376                                   (u32) px->control, (u32) px->status));
 377
 378                 /*
 379                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 380                  */
 381                 if (!px->core_frequency ||
 382                     ((u32)(px->core_frequency * 1000) !=
 383                      (px->core_frequency * 1000))) {
 384                         printk(KERN_ERR FW_BUG PREFIX
 385                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 386                                pr->id, px->core_frequency);
 387                         if (last_invalid == -1)
 388                                 last_invalid = i;
 389                 } else {
 390                         if (last_invalid != -1) {
 391                                 /*
 392                                  * Copy this valid entry over last_invalid entry
 393                                  */
 394                                 memcpy(&(pr->performance->states[last_invalid]),
 395                                        px, sizeof(struct acpi_processor_px));
 396                                 ++last_invalid;
 397                         }
 398                 }
 399         }
 400
 401         if (last_invalid == 0) {
 402                 printk(KERN_ERR FW_BUG PREFIX
 403                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 404                 result = -EFAULT;
 405                 kfree(pr->performance->states);
 406                 pr->performance->states = NULL;
 407         }
 408
 409         if (last_invalid > 0)
 410                 pr->performance->state_count = last_invalid;
 411
 412       end:
 413         kfree(buffer.pointer);
 414
 415         return result;
 416 }
 417
 418 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 419 {
 420         int result = 0;
 421
 422         if (!pr || !pr->performance || !pr->handle)
 423                 return -EINVAL;
 424
 425         if (!acpi_has_method(pr->handle, "_PCT")) {
 426                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 427                                   "ACPI-based processor performance control unavailable\n"));
 428                 return -ENODEV;
 429         }
 430
 431         result = acpi_processor_get_performance_control(pr);
 432         if (result)
 433                 goto update_bios;
 434
 435         result = acpi_processor_get_performance_states(pr);
 436         if (result)
 437                 goto update_bios;
 438
 439         /* We need to call _PPC once when cpufreq starts */
 440         if (ignore_ppc != 1)
 441                 result = acpi_processor_get_platform_limit(pr);
 442
 443         return result;
 444
 445         /*
 446          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 447          * the BIOS is older than the CPU and does not know its frequencies
 448          */
 449  update_bios:
 450 #ifdef CONFIG_X86
 451         if (acpi_has_method(pr->handle, "_PPC")) {
 452                 if(boot_cpu_has(X86_FEATURE_EST))
 453                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 454                                "frequency support\n");
 455         }
 456 #endif
 457         return result;
 458 }
 459 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 460
 461 int acpi_processor_pstate_control(void)
 462 {
 463         acpi_status status;
 464
 465         if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
 466                 return 0;
 467
 468         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 469                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 470                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 471
 472         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 473                                     (u32)acpi_gbl_FADT.pstate_control, 8);
 474         if (ACPI_SUCCESS(status))
 475                 return 1;
 476
 477         ACPI_EXCEPTION((AE_INFO, status,
 478                         "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
 479                         acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 480         return -EIO;
 481 }
 482
 483 int acpi_processor_notify_smm(struct module *calling_module)
 484 {
 485         static int is_done = 0;
 486         int result;
 487
 488         if (!acpi_processor_cpufreq_init)
 489                 return -EBUSY;
 490
 491         if (!try_module_get(calling_module))
 492                 return -EINVAL;
 493
 494         /* is_done is set to negative if an error occurred,
 495          * and to postitive if _no_ error occurred, but SMM
 496          * was already notified. This avoids double notification
 497          * which might lead to unexpected results...
 498          */
 499         if (is_done > 0) {
 500                 module_put(calling_module);
 501                 return 0;
 502         } else if (is_done < 0) {
 503                 module_put(calling_module);
 504                 return is_done;
 505         }
 506
 507         is_done = -EIO;
 508
 509         result = acpi_processor_pstate_control();
 510         if (!result) {
 511                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 512                 module_put(calling_module);
 513                 return 0;
 514         }
 515         if (result < 0) {
 516                 module_put(calling_module);
 517                 return result;
 518         }
 519
 520         /* Success. If there's no _PPC, we need to fear nothing, so
 521          * we can allow the cpufreq driver to be rmmod'ed. */
 522         is_done = 1;
 523
 524         if (!acpi_processor_ppc_in_use)
 525                 module_put(calling_module);
 526
 527         return 0;
 528 }
 529
 530 EXPORT_SYMBOL(acpi_processor_notify_smm);
 531
 532 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
 533 {
 534         int result = 0;
 535         acpi_status status = AE_OK;
 536         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 537         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 538         struct acpi_buffer state = {0, NULL};
 539         union acpi_object  *psd = NULL;
 540
 541         status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
 542         if (ACPI_FAILURE(status)) {
 543                 return -ENODEV;
 544         }
 545
 546         psd = buffer.pointer;
 547         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 548                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 549                 result = -EFAULT;
 550                 goto end;
 551         }
 552
 553         if (psd->package.count != 1) {
 554                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 555                 result = -EFAULT;
 556                 goto end;
 557         }
 558
 559         state.length = sizeof(struct acpi_psd_package);
 560         state.pointer = pdomain;
 561
 562         status = acpi_extract_package(&(psd->package.elements[0]),
 563                 &format, &state);
 564         if (ACPI_FAILURE(status)) {
 565                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 566                 result = -EFAULT;
 567                 goto end;
 568         }
 569
 570         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 571                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 572                 result = -EFAULT;
 573                 goto end;
 574         }
 575
 576         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 577                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 578                 result = -EFAULT;
 579                 goto end;
 580         }
 581
 582         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 583             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 584             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 585                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 586                 result = -EFAULT;
 587                 goto end;
 588         }
 589 end:
 590         kfree(buffer.pointer);
 591         return result;
 592 }
 593 EXPORT_SYMBOL(acpi_processor_get_psd);
 594
 595 int acpi_processor_preregister_performance(
 596                 struct acpi_processor_performance __percpu *performance)
 597 {
 598         int count_target;
 599         int retval = 0;
 600         unsigned int i, j;
 601         cpumask_var_t covered_cpus;
 602         struct acpi_processor *pr;
 603         struct acpi_psd_package *pdomain;
 604         struct acpi_processor *match_pr;
 605         struct acpi_psd_package *match_pdomain;
 606
 607         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 608                 return -ENOMEM;
 609
 610         mutex_lock(&performance_mutex);
 611
 612         /*
 613          * Check if another driver has already registered, and abort before
 614          * changing pr->performance if it has. Check input data as well.
 615          */
 616         for_each_possible_cpu(i) {
 617                 pr = per_cpu(processors, i);
 618                 if (!pr) {
 619                         /* Look only at processors in ACPI namespace */
 620                         continue;
 621                 }
 622
 623                 if (pr->performance) {
 624                         retval = -EBUSY;
 625                         goto err_out;
 626                 }
 627
 628                 if (!performance || !per_cpu_ptr(performance, i)) {
 629                         retval = -EINVAL;
 630                         goto err_out;
 631                 }
 632         }
 633
 634         /* Call _PSD for all CPUs */
 635         for_each_possible_cpu(i) {
 636                 pr = per_cpu(processors, i);
 637                 if (!pr)
 638                         continue;
 639
 640                 pr->performance = per_cpu_ptr(performance, i);
 641                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 642                 pdomain = &(pr->performance->domain_info);
 643                 if (acpi_processor_get_psd(pr->handle, pdomain)) {
 644                         retval = -EINVAL;
 645                         continue;
 646                 }
 647         }
 648         if (retval)
 649                 goto err_ret;
 650
 651         /*
 652          * Now that we have _PSD data from all CPUs, lets setup P-state
 653          * domain info.
 654          */
 655         for_each_possible_cpu(i) {
 656                 pr = per_cpu(processors, i);
 657                 if (!pr)
 658                         continue;
 659
 660                 if (cpumask_test_cpu(i, covered_cpus))
 661                         continue;
 662
 663                 pdomain = &(pr->performance->domain_info);
 664                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 665                 cpumask_set_cpu(i, covered_cpus);
 666                 if (pdomain->num_processors <= 1)
 667                         continue;
 668
 669                 /* Validate the Domain info */
 670                 count_target = pdomain->num_processors;
 671                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 672                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 673                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 674                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 675                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 676                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 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                         /* Here i and j are in the same domain */
 691
 692                         if (match_pdomain->num_processors != count_target) {
 693                                 retval = -EINVAL;
 694                                 goto err_ret;
 695                         }
 696
 697                         if (pdomain->coord_type != match_pdomain->coord_type) {
 698                                 retval = -EINVAL;
 699                                 goto err_ret;
 700                         }
 701
 702                         cpumask_set_cpu(j, covered_cpus);
 703                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 704                 }
 705
 706                 for_each_possible_cpu(j) {
 707                         if (i == j)
 708                                 continue;
 709
 710                         match_pr = per_cpu(processors, j);
 711                         if (!match_pr)
 712                                 continue;
 713
 714                         match_pdomain = &(match_pr->performance->domain_info);
 715                         if (match_pdomain->domain != pdomain->domain)
 716                                 continue;
 717
 718                         match_pr->performance->shared_type =
 719                                         pr->performance->shared_type;
 720                         cpumask_copy(match_pr->performance->shared_cpu_map,
 721                                      pr->performance->shared_cpu_map);
 722                 }
 723         }
 724
 725 err_ret:
 726         for_each_possible_cpu(i) {
 727                 pr = per_cpu(processors, i);
 728                 if (!pr || !pr->performance)
 729                         continue;
 730
 731                 /* Assume no coordination on any error parsing domain info */
 732                 if (retval) {
 733                         cpumask_clear(pr->performance->shared_cpu_map);
 734                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 735                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 736                 }
 737                 pr->performance = NULL; /* Will be set for real in register */
 738         }
 739
 740 err_out:
 741         mutex_unlock(&performance_mutex);
 742         free_cpumask_var(covered_cpus);
 743         return retval;
 744 }
 745 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 746
 747 int
 748 acpi_processor_register_performance(struct acpi_processor_performance
 749                                     *performance, unsigned int cpu)
 750 {
 751         struct acpi_processor *pr;
 752
 753         if (!acpi_processor_cpufreq_init)
 754                 return -EINVAL;
 755
 756         mutex_lock(&performance_mutex);
 757
 758         pr = per_cpu(processors, cpu);
 759         if (!pr) {
 760                 mutex_unlock(&performance_mutex);
 761                 return -ENODEV;
 762         }
 763
 764         if (pr->performance) {
 765                 mutex_unlock(&performance_mutex);
 766                 return -EBUSY;
 767         }
 768
 769         WARN_ON(!performance);
 770
 771         pr->performance = performance;
 772
 773         if (acpi_processor_get_performance_info(pr)) {
 774                 pr->performance = NULL;
 775                 mutex_unlock(&performance_mutex);
 776                 return -EIO;
 777         }
 778
 779         mutex_unlock(&performance_mutex);
 780         return 0;
 781 }
 782
 783 EXPORT_SYMBOL(acpi_processor_register_performance);
 784
 785 void acpi_processor_unregister_performance(unsigned int cpu)
 786 {
 787         struct acpi_processor *pr;
 788
 789         mutex_lock(&performance_mutex);
 790
 791         pr = per_cpu(processors, cpu);
 792         if (!pr) {
 793                 mutex_unlock(&performance_mutex);
 794                 return;
 795         }
 796
 797         if (pr->performance)
 798                 kfree(pr->performance->states);
 799         pr->performance = NULL;
 800
 801         mutex_unlock(&performance_mutex);
 802
 803         return;
 804 }
 805
 806 EXPORT_SYMBOL(acpi_processor_unregister_performance);