drivers/acpi/processor_perflib.c

   1 /*
   2  * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  *
  11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or (at
  16  *  your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful, but
  19  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  *  General Public License for more details.
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/cpufreq.h>
  29 #include <linux/slab.h>
  30 #include <linux/acpi.h>
  31 #include <acpi/processor.h>
  32 #ifdef CONFIG_X86
  33 #include <asm/cpufeature.h>
  34 #endif
  35
  36 #define PREFIX "ACPI: "
  37
  38 #define ACPI_PROCESSOR_CLASS            "processor"
  39 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  40 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  41 ACPI_MODULE_NAME("processor_perflib");
  42
  43 static DEFINE_MUTEX(performance_mutex);
  44
  45 /*
  46  * _PPC support is implemented as a CPUfreq policy notifier:
  47  * This means each time a CPUfreq driver registered also with
  48  * the ACPI core is asked to change the speed policy, the maximum
  49  * value is adjusted so that it is within the platform limit.
  50  *
  51  * Also, when a new platform limit value is detected, the CPUfreq
  52  * policy is adjusted accordingly.
  53  */
  54
  55 /* ignore_ppc:
  56  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  57  *       ignore _PPC
  58  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  59  *  1 -> ignore _PPC totally -> forced by user through boot param
  60  */
  61 static int ignore_ppc = -1;
  62 module_param(ignore_ppc, int, 0644);
  63 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  64                  "limited by BIOS, this should help");
  65
  66 #define PPC_REGISTERED   1
  67 #define PPC_IN_USE       2
  68
  69 static int acpi_processor_ppc_status;
  70
  71 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  72                                        unsigned long event, void *data)
  73 {
  74         struct cpufreq_policy *policy = data;
  75         struct acpi_processor *pr;
  76         unsigned int ppc = 0;
  77
  78         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  79                 ignore_ppc = 0;
  80                 return 0;
  81         }
  82
  83         if (ignore_ppc)
  84                 return 0;
  85
  86         if (event != CPUFREQ_ADJUST)
  87                 return 0;
  88
  89         mutex_lock(&performance_mutex);
  90
  91         pr = per_cpu(processors, policy->cpu);
  92         if (!pr || !pr->performance)
  93                 goto out;
  94
  95         ppc = (unsigned int)pr->performance_platform_limit;
  96
  97         if (ppc >= pr->performance->state_count)
  98                 goto out;
  99
 100         cpufreq_verify_within_limits(policy, 0,
 101                                      pr->performance->states[ppc].
 102                                      core_frequency * 1000);
 103
 104       out:
 105         mutex_unlock(&performance_mutex);
 106
 107         return 0;
 108 }
 109
 110 static struct notifier_block acpi_ppc_notifier_block = {
 111         .notifier_call = acpi_processor_ppc_notifier,
 112 };
 113
 114 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 115 {
 116         acpi_status status = 0;
 117         unsigned long long ppc = 0;
 118
 119
 120         if (!pr)
 121                 return -EINVAL;
 122
 123         /*
 124          * _PPC indicates the maximum state currently supported by the platform
 125          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 126          */
 127         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 128
 129         if (status != AE_NOT_FOUND)
 130                 acpi_processor_ppc_status |= PPC_IN_USE;
 131
 132         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 133                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 134                 return -ENODEV;
 135         }
 136
 137         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 138                        (int)ppc, ppc ? "" : "not");
 139
 140         pr->performance_platform_limit = (int)ppc;
 141
 142         return 0;
 143 }
 144
 145 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 146 /*
 147  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 148  * @handle: ACPI processor handle
 149  * @status: the status code of _PPC evaluation
 150  *      0: success. OSPM is now using the performance state specificed.
 151  *      1: failure. OSPM has not changed the number of P-states in use
 152  */
 153 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 154 {
 155         if (acpi_has_method(handle, "_OST"))
 156                 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
 157                                   status, NULL);
 158 }
 159
 160 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 161 {
 162         int ret;
 163
 164         if (ignore_ppc) {
 165                 /*
 166                  * Only when it is notification event, the _OST object
 167                  * will be evaluated. Otherwise it is skipped.
 168                  */
 169                 if (event_flag)
 170                         acpi_processor_ppc_ost(pr->handle, 1);
 171                 return;
 172         }
 173
 174         ret = acpi_processor_get_platform_limit(pr);
 175         /*
 176          * Only when it is notification event, the _OST object
 177          * will be evaluated. Otherwise it is skipped.
 178          */
 179         if (event_flag) {
 180                 if (ret < 0)
 181                         acpi_processor_ppc_ost(pr->handle, 1);
 182                 else
 183                         acpi_processor_ppc_ost(pr->handle, 0);
 184         }
 185         if (ret >= 0)
 186                 cpufreq_update_policy(pr->id);
 187 }
 188
 189 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 190 {
 191         struct acpi_processor *pr;
 192
 193         pr = per_cpu(processors, cpu);
 194         if (!pr || !pr->performance || !pr->performance->state_count)
 195                 return -ENODEV;
 196         *limit = pr->performance->states[pr->performance_platform_limit].
 197                 core_frequency * 1000;
 198         return 0;
 199 }
 200 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 201
 202 void acpi_processor_ppc_init(void)
 203 {
 204         if (!cpufreq_register_notifier
 205             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 206                 acpi_processor_ppc_status |= PPC_REGISTERED;
 207         else
 208                 printk(KERN_DEBUG
 209                        "Warning: Processor Platform Limit not supported.\n");
 210 }
 211
 212 void acpi_processor_ppc_exit(void)
 213 {
 214         if (acpi_processor_ppc_status & PPC_REGISTERED)
 215                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 216                                             CPUFREQ_POLICY_NOTIFIER);
 217
 218         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 219 }
 220
 221 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 222 {
 223         int result = 0;
 224         acpi_status status = 0;
 225         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 226         union acpi_object *pct = NULL;
 227         union acpi_object obj = { 0 };
 228
 229
 230         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 231         if (ACPI_FAILURE(status)) {
 232                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 233                 return -ENODEV;
 234         }
 235
 236         pct = (union acpi_object *)buffer.pointer;
 237         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 238             || (pct->package.count != 2)) {
 239                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 240                 result = -EFAULT;
 241                 goto end;
 242         }
 243
 244         /*
 245          * control_register
 246          */
 247
 248         obj = pct->package.elements[0];
 249
 250         if ((obj.type != ACPI_TYPE_BUFFER)
 251             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 252             || (obj.buffer.pointer == NULL)) {
 253                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 254                 result = -EFAULT;
 255                 goto end;
 256         }
 257         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 258                sizeof(struct acpi_pct_register));
 259
 260         /*
 261          * status_register
 262          */
 263
 264         obj = pct->package.elements[1];
 265
 266         if ((obj.type != ACPI_TYPE_BUFFER)
 267             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 268             || (obj.buffer.pointer == NULL)) {
 269                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 270                 result = -EFAULT;
 271                 goto end;
 272         }
 273
 274         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 275                sizeof(struct acpi_pct_register));
 276
 277       end:
 278         kfree(buffer.pointer);
 279
 280         return result;
 281 }
 282
 283 #ifdef CONFIG_X86
 284 /*
 285  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 286  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 287  */
 288 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 289 {
 290         u32 hi, lo, fid, did;
 291         int index = px->control & 0x00000007;
 292
 293         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 294                 return;
 295
 296         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 297             || boot_cpu_data.x86 == 0x11) {
 298                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 299                 /*
 300                  * MSR C001_0064+:
 301                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 302                  */
 303                 if (!(hi & BIT(31)))
 304                         return;
 305
 306                 fid = lo & 0x3f;
 307                 did = (lo >> 6) & 7;
 308                 if (boot_cpu_data.x86 == 0x10)
 309                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 310                 else
 311                         px->core_frequency = (100 * (fid + 8)) >> did;
 312         }
 313 }
 314 #else
 315 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 316 #endif
 317
 318 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 319 {
 320         int result = 0;
 321         acpi_status status = AE_OK;
 322         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 323         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 324         struct acpi_buffer state = { 0, NULL };
 325         union acpi_object *pss = NULL;
 326         int i;
 327         int last_invalid = -1;
 328
 329
 330         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 331         if (ACPI_FAILURE(status)) {
 332                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 333                 return -ENODEV;
 334         }
 335
 336         pss = buffer.pointer;
 337         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 338                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 339                 result = -EFAULT;
 340                 goto end;
 341         }
 342
 343         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 344                           pss->package.count));
 345
 346         pr->performance->state_count = pss->package.count;
 347         pr->performance->states =
 348             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 349                     GFP_KERNEL);
 350         if (!pr->performance->states) {
 351                 result = -ENOMEM;
 352                 goto end;
 353         }
 354
 355         for (i = 0; i < pr->performance->state_count; i++) {
 356
 357                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 358
 359                 state.length = sizeof(struct acpi_processor_px);
 360                 state.pointer = px;
 361
 362                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 363
 364                 status = acpi_extract_package(&(pss->package.elements[i]),
 365                                               &format, &state);
 366                 if (ACPI_FAILURE(status)) {
 367                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 368                         result = -EFAULT;
 369                         kfree(pr->performance->states);
 370                         goto end;
 371                 }
 372
 373                 amd_fixup_frequency(px, i);
 374
 375                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 376                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 377                                   i,
 378                                   (u32) px->core_frequency,
 379                                   (u32) px->power,
 380                                   (u32) px->transition_latency,
 381                                   (u32) px->bus_master_latency,
 382                                   (u32) px->control, (u32) px->status));
 383
 384                 /*
 385                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 386                  */
 387                 if (!px->core_frequency ||
 388                     ((u32)(px->core_frequency * 1000) !=
 389                      (px->core_frequency * 1000))) {
 390                         printk(KERN_ERR FW_BUG PREFIX
 391                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 392                                pr->id, px->core_frequency);
 393                         if (last_invalid == -1)
 394                                 last_invalid = i;
 395                 } else {
 396                         if (last_invalid != -1) {
 397                                 /*
 398                                  * Copy this valid entry over last_invalid entry
 399                                  */
 400                                 memcpy(&(pr->performance->states[last_invalid]),
 401                                        px, sizeof(struct acpi_processor_px));
 402                                 ++last_invalid;
 403                         }
 404                 }
 405         }
 406
 407         if (last_invalid == 0) {
 408                 printk(KERN_ERR FW_BUG PREFIX
 409                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 410                 result = -EFAULT;
 411                 kfree(pr->performance->states);
 412                 pr->performance->states = NULL;
 413         }
 414
 415         if (last_invalid > 0)
 416                 pr->performance->state_count = last_invalid;
 417
 418       end:
 419         kfree(buffer.pointer);
 420
 421         return result;
 422 }
 423
 424 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 425 {
 426         int result = 0;
 427
 428         if (!pr || !pr->performance || !pr->handle)
 429                 return -EINVAL;
 430
 431         if (!acpi_has_method(pr->handle, "_PCT")) {
 432                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 433                                   "ACPI-based processor performance control unavailable\n"));
 434                 return -ENODEV;
 435         }
 436
 437         result = acpi_processor_get_performance_control(pr);
 438         if (result)
 439                 goto update_bios;
 440
 441         result = acpi_processor_get_performance_states(pr);
 442         if (result)
 443                 goto update_bios;
 444
 445         /* We need to call _PPC once when cpufreq starts */
 446         if (ignore_ppc != 1)
 447                 result = acpi_processor_get_platform_limit(pr);
 448
 449         return result;
 450
 451         /*
 452          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 453          * the BIOS is older than the CPU and does not know its frequencies
 454          */
 455  update_bios:
 456 #ifdef CONFIG_X86
 457         if (acpi_has_method(pr->handle, "_PPC")) {
 458                 if(boot_cpu_has(X86_FEATURE_EST))
 459                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 460                                "frequency support\n");
 461         }
 462 #endif
 463         return result;
 464 }
 465 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 466
 467 int acpi_processor_pstate_control(void)
 468 {
 469         acpi_status status;
 470
 471         if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
 472                 return 0;
 473
 474         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 475                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 476                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 477
 478         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 479                                     (u32)acpi_gbl_FADT.pstate_control, 8);
 480         if (ACPI_SUCCESS(status))
 481                 return 1;
 482
 483         ACPI_EXCEPTION((AE_INFO, status,
 484                         "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
 485                         acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 486         return -EIO;
 487 }
 488
 489 int acpi_processor_notify_smm(struct module *calling_module)
 490 {
 491         static int is_done = 0;
 492         int result;
 493
 494         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 495                 return -EBUSY;
 496
 497         if (!try_module_get(calling_module))
 498                 return -EINVAL;
 499
 500         /* is_done is set to negative if an error occurred,
 501          * and to postitive if _no_ error occurred, but SMM
 502          * was already notified. This avoids double notification
 503          * which might lead to unexpected results...
 504          */
 505         if (is_done > 0) {
 506                 module_put(calling_module);
 507                 return 0;
 508         } else if (is_done < 0) {
 509                 module_put(calling_module);
 510                 return is_done;
 511         }
 512
 513         is_done = -EIO;
 514
 515         result = acpi_processor_pstate_control();
 516         if (!result) {
 517                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 518                 module_put(calling_module);
 519                 return 0;
 520         }
 521         if (result < 0) {
 522                 module_put(calling_module);
 523                 return result;
 524         }
 525
 526         /* Success. If there's no _PPC, we need to fear nothing, so
 527          * we can allow the cpufreq driver to be rmmod'ed. */
 528         is_done = 1;
 529
 530         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 531                 module_put(calling_module);
 532
 533         return 0;
 534 }
 535
 536 EXPORT_SYMBOL(acpi_processor_notify_smm);
 537
 538 static int acpi_processor_get_psd(struct acpi_processor *pr)
 539 {
 540         int result = 0;
 541         acpi_status status = AE_OK;
 542         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 543         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 544         struct acpi_buffer state = {0, NULL};
 545         union acpi_object  *psd = NULL;
 546         struct acpi_psd_package *pdomain;
 547
 548         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 549         if (ACPI_FAILURE(status)) {
 550                 return -ENODEV;
 551         }
 552
 553         psd = buffer.pointer;
 554         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 555                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 556                 result = -EFAULT;
 557                 goto end;
 558         }
 559
 560         if (psd->package.count != 1) {
 561                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 562                 result = -EFAULT;
 563                 goto end;
 564         }
 565
 566         pdomain = &(pr->performance->domain_info);
 567
 568         state.length = sizeof(struct acpi_psd_package);
 569         state.pointer = pdomain;
 570
 571         status = acpi_extract_package(&(psd->package.elements[0]),
 572                 &format, &state);
 573         if (ACPI_FAILURE(status)) {
 574                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 575                 result = -EFAULT;
 576                 goto end;
 577         }
 578
 579         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 580                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 581                 result = -EFAULT;
 582                 goto end;
 583         }
 584
 585         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 586                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 587                 result = -EFAULT;
 588                 goto end;
 589         }
 590
 591         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 592             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 593             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 594                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 595                 result = -EFAULT;
 596                 goto end;
 597         }
 598 end:
 599         kfree(buffer.pointer);
 600         return result;
 601 }
 602
 603 int acpi_processor_preregister_performance(
 604                 struct acpi_processor_performance __percpu *performance)
 605 {
 606         int count_target;
 607         int retval = 0;
 608         unsigned int i, j;
 609         cpumask_var_t covered_cpus;
 610         struct acpi_processor *pr;
 611         struct acpi_psd_package *pdomain;
 612         struct acpi_processor *match_pr;
 613         struct acpi_psd_package *match_pdomain;
 614
 615         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 616                 return -ENOMEM;
 617
 618         mutex_lock(&performance_mutex);
 619
 620         /*
 621          * Check if another driver has already registered, and abort before
 622          * changing pr->performance if it has. Check input data as well.
 623          */
 624         for_each_possible_cpu(i) {
 625                 pr = per_cpu(processors, i);
 626                 if (!pr) {
 627                         /* Look only at processors in ACPI namespace */
 628                         continue;
 629                 }
 630
 631                 if (pr->performance) {
 632                         retval = -EBUSY;
 633                         goto err_out;
 634                 }
 635
 636                 if (!performance || !per_cpu_ptr(performance, i)) {
 637                         retval = -EINVAL;
 638                         goto err_out;
 639                 }
 640         }
 641
 642         /* Call _PSD for all CPUs */
 643         for_each_possible_cpu(i) {
 644                 pr = per_cpu(processors, i);
 645                 if (!pr)
 646                         continue;
 647
 648                 pr->performance = per_cpu_ptr(performance, i);
 649                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 650                 if (acpi_processor_get_psd(pr)) {
 651                         retval = -EINVAL;
 652                         continue;
 653                 }
 654         }
 655         if (retval)
 656                 goto err_ret;
 657
 658         /*
 659          * Now that we have _PSD data from all CPUs, lets setup P-state
 660          * domain info.
 661          */
 662         for_each_possible_cpu(i) {
 663                 pr = per_cpu(processors, i);
 664                 if (!pr)
 665                         continue;
 666
 667                 if (cpumask_test_cpu(i, covered_cpus))
 668                         continue;
 669
 670                 pdomain = &(pr->performance->domain_info);
 671                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 672                 cpumask_set_cpu(i, covered_cpus);
 673                 if (pdomain->num_processors <= 1)
 674                         continue;
 675
 676                 /* Validate the Domain info */
 677                 count_target = pdomain->num_processors;
 678                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 679                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 680                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 681                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 682                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 683                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 684
 685                 for_each_possible_cpu(j) {
 686                         if (i == j)
 687                                 continue;
 688
 689                         match_pr = per_cpu(processors, j);
 690                         if (!match_pr)
 691                                 continue;
 692
 693                         match_pdomain = &(match_pr->performance->domain_info);
 694                         if (match_pdomain->domain != pdomain->domain)
 695                                 continue;
 696
 697                         /* Here i and j are in the same domain */
 698
 699                         if (match_pdomain->num_processors != count_target) {
 700                                 retval = -EINVAL;
 701                                 goto err_ret;
 702                         }
 703
 704                         if (pdomain->coord_type != match_pdomain->coord_type) {
 705                                 retval = -EINVAL;
 706                                 goto err_ret;
 707                         }
 708
 709                         cpumask_set_cpu(j, covered_cpus);
 710                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 711                 }
 712
 713                 for_each_possible_cpu(j) {
 714                         if (i == j)
 715                                 continue;
 716
 717                         match_pr = per_cpu(processors, j);
 718                         if (!match_pr)
 719                                 continue;
 720
 721                         match_pdomain = &(match_pr->performance->domain_info);
 722                         if (match_pdomain->domain != pdomain->domain)
 723                                 continue;
 724
 725                         match_pr->performance->shared_type =
 726                                         pr->performance->shared_type;
 727                         cpumask_copy(match_pr->performance->shared_cpu_map,
 728                                      pr->performance->shared_cpu_map);
 729                 }
 730         }
 731
 732 err_ret:
 733         for_each_possible_cpu(i) {
 734                 pr = per_cpu(processors, i);
 735                 if (!pr || !pr->performance)
 736                         continue;
 737
 738                 /* Assume no coordination on any error parsing domain info */
 739                 if (retval) {
 740                         cpumask_clear(pr->performance->shared_cpu_map);
 741                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 742                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 743                 }
 744                 pr->performance = NULL; /* Will be set for real in register */
 745         }
 746
 747 err_out:
 748         mutex_unlock(&performance_mutex);
 749         free_cpumask_var(covered_cpus);
 750         return retval;
 751 }
 752 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 753
 754 int
 755 acpi_processor_register_performance(struct acpi_processor_performance
 756                                     *performance, unsigned int cpu)
 757 {
 758         struct acpi_processor *pr;
 759
 760         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 761                 return -EINVAL;
 762
 763         mutex_lock(&performance_mutex);
 764
 765         pr = per_cpu(processors, cpu);
 766         if (!pr) {
 767                 mutex_unlock(&performance_mutex);
 768                 return -ENODEV;
 769         }
 770
 771         if (pr->performance) {
 772                 mutex_unlock(&performance_mutex);
 773                 return -EBUSY;
 774         }
 775
 776         WARN_ON(!performance);
 777
 778         pr->performance = performance;
 779
 780         if (acpi_processor_get_performance_info(pr)) {
 781                 pr->performance = NULL;
 782                 mutex_unlock(&performance_mutex);
 783                 return -EIO;
 784         }
 785
 786         mutex_unlock(&performance_mutex);
 787         return 0;
 788 }
 789
 790 EXPORT_SYMBOL(acpi_processor_register_performance);
 791
 792 void acpi_processor_unregister_performance(unsigned int cpu)
 793 {
 794         struct acpi_processor *pr;
 795
 796         mutex_lock(&performance_mutex);
 797
 798         pr = per_cpu(processors, cpu);
 799         if (!pr) {
 800                 mutex_unlock(&performance_mutex);
 801                 return;
 802         }
 803
 804         if (pr->performance)
 805                 kfree(pr->performance->states);
 806         pr->performance = NULL;
 807
 808         mutex_unlock(&performance_mutex);
 809
 810         return;
 811 }
 812
 813 EXPORT_SYMBOL(acpi_processor_unregister_performance);