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  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  26  *
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/cpufreq.h>
  33 #include <linux/slab.h>
  34 #include <linux/acpi.h>
  35 #include <acpi/processor.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/cpufeature.h>
  38 #endif
  39
  40 #define PREFIX "ACPI: "
  41
  42 #define ACPI_PROCESSOR_CLASS            "processor"
  43 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  44 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  45 ACPI_MODULE_NAME("processor_perflib");
  46
  47 static DEFINE_MUTEX(performance_mutex);
  48
  49 /*
  50  * _PPC support is implemented as a CPUfreq policy notifier:
  51  * This means each time a CPUfreq driver registered also with
  52  * the ACPI core is asked to change the speed policy, the maximum
  53  * value is adjusted so that it is within the platform limit.
  54  *
  55  * Also, when a new platform limit value is detected, the CPUfreq
  56  * policy is adjusted accordingly.
  57  */
  58
  59 /* ignore_ppc:
  60  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  61  *       ignore _PPC
  62  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  63  *  1 -> ignore _PPC totally -> forced by user through boot param
  64  */
  65 static int ignore_ppc = -1;
  66 module_param(ignore_ppc, int, 0644);
  67 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  68                  "limited by BIOS, this should help");
  69
  70 #define PPC_REGISTERED   1
  71 #define PPC_IN_USE       2
  72
  73 static int acpi_processor_ppc_status;
  74
  75 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  76                                        unsigned long event, void *data)
  77 {
  78         struct cpufreq_policy *policy = data;
  79         struct acpi_processor *pr;
  80         unsigned int ppc = 0;
  81
  82         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  83                 ignore_ppc = 0;
  84                 return 0;
  85         }
  86
  87         if (ignore_ppc)
  88                 return 0;
  89
  90         if (event != CPUFREQ_INCOMPATIBLE)
  91                 return 0;
  92
  93         mutex_lock(&performance_mutex);
  94
  95         pr = per_cpu(processors, policy->cpu);
  96         if (!pr || !pr->performance)
  97                 goto out;
  98
  99         ppc = (unsigned int)pr->performance_platform_limit;
 100
 101         if (ppc >= pr->performance->state_count)
 102                 goto out;
 103
 104         cpufreq_verify_within_limits(policy, 0,
 105                                      pr->performance->states[ppc].
 106                                      core_frequency * 1000);
 107
 108       out:
 109         mutex_unlock(&performance_mutex);
 110
 111         return 0;
 112 }
 113
 114 static struct notifier_block acpi_ppc_notifier_block = {
 115         .notifier_call = acpi_processor_ppc_notifier,
 116 };
 117
 118 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 119 {
 120         acpi_status status = 0;
 121         unsigned long long ppc = 0;
 122
 123
 124         if (!pr)
 125                 return -EINVAL;
 126
 127         /*
 128          * _PPC indicates the maximum state currently supported by the platform
 129          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 130          */
 131         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 132
 133         if (status != AE_NOT_FOUND)
 134                 acpi_processor_ppc_status |= PPC_IN_USE;
 135
 136         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 137                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 138                 return -ENODEV;
 139         }
 140
 141         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 142                        (int)ppc, ppc ? "" : "not");
 143
 144         pr->performance_platform_limit = (int)ppc;
 145
 146         return 0;
 147 }
 148
 149 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 150 /*
 151  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 152  * @handle: ACPI processor handle
 153  * @status: the status code of _PPC evaluation
 154  *      0: success. OSPM is now using the performance state specificed.
 155  *      1: failure. OSPM has not changed the number of P-states in use
 156  */
 157 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 158 {
 159         union acpi_object params[2] = {
 160                 {.type = ACPI_TYPE_INTEGER,},
 161                 {.type = ACPI_TYPE_INTEGER,},
 162         };
 163         struct acpi_object_list arg_list = {2, params};
 164
 165         if (acpi_has_method(handle, "_OST")) {
 166                 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 167                 params[1].integer.value =  status;
 168                 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 169         }
 170 }
 171
 172 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 173 {
 174         int ret;
 175
 176         if (ignore_ppc) {
 177                 /*
 178                  * Only when it is notification event, the _OST object
 179                  * will be evaluated. Otherwise it is skipped.
 180                  */
 181                 if (event_flag)
 182                         acpi_processor_ppc_ost(pr->handle, 1);
 183                 return 0;
 184         }
 185
 186         ret = acpi_processor_get_platform_limit(pr);
 187         /*
 188          * Only when it is notification event, the _OST object
 189          * will be evaluated. Otherwise it is skipped.
 190          */
 191         if (event_flag) {
 192                 if (ret < 0)
 193                         acpi_processor_ppc_ost(pr->handle, 1);
 194                 else
 195                         acpi_processor_ppc_ost(pr->handle, 0);
 196         }
 197         if (ret < 0)
 198                 return (ret);
 199         else
 200                 return cpufreq_update_policy(pr->id);
 201 }
 202
 203 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 204 {
 205         struct acpi_processor *pr;
 206
 207         pr = per_cpu(processors, cpu);
 208         if (!pr || !pr->performance || !pr->performance->state_count)
 209                 return -ENODEV;
 210         *limit = pr->performance->states[pr->performance_platform_limit].
 211                 core_frequency * 1000;
 212         return 0;
 213 }
 214 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 215
 216 void acpi_processor_ppc_init(void)
 217 {
 218         if (!cpufreq_register_notifier
 219             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 220                 acpi_processor_ppc_status |= PPC_REGISTERED;
 221         else
 222                 printk(KERN_DEBUG
 223                        "Warning: Processor Platform Limit not supported.\n");
 224 }
 225
 226 void acpi_processor_ppc_exit(void)
 227 {
 228         if (acpi_processor_ppc_status & PPC_REGISTERED)
 229                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 230                                             CPUFREQ_POLICY_NOTIFIER);
 231
 232         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 233 }
 234
 235 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 236 {
 237         int result = 0;
 238         acpi_status status = 0;
 239         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 240         union acpi_object *pct = NULL;
 241         union acpi_object obj = { 0 };
 242
 243
 244         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 245         if (ACPI_FAILURE(status)) {
 246                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 247                 return -ENODEV;
 248         }
 249
 250         pct = (union acpi_object *)buffer.pointer;
 251         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 252             || (pct->package.count != 2)) {
 253                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 254                 result = -EFAULT;
 255                 goto end;
 256         }
 257
 258         /*
 259          * control_register
 260          */
 261
 262         obj = pct->package.elements[0];
 263
 264         if ((obj.type != ACPI_TYPE_BUFFER)
 265             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 266             || (obj.buffer.pointer == NULL)) {
 267                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 268                 result = -EFAULT;
 269                 goto end;
 270         }
 271         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 272                sizeof(struct acpi_pct_register));
 273
 274         /*
 275          * status_register
 276          */
 277
 278         obj = pct->package.elements[1];
 279
 280         if ((obj.type != ACPI_TYPE_BUFFER)
 281             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 282             || (obj.buffer.pointer == NULL)) {
 283                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 284                 result = -EFAULT;
 285                 goto end;
 286         }
 287
 288         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 289                sizeof(struct acpi_pct_register));
 290
 291       end:
 292         kfree(buffer.pointer);
 293
 294         return result;
 295 }
 296
 297 #ifdef CONFIG_X86
 298 /*
 299  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 300  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 301  */
 302 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 303 {
 304         u32 hi, lo, fid, did;
 305         int index = px->control & 0x00000007;
 306
 307         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 308                 return;
 309
 310         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 311             || boot_cpu_data.x86 == 0x11) {
 312                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 313                 /*
 314                  * MSR C001_0064+:
 315                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 316                  */
 317                 if (!(hi & BIT(31)))
 318                         return;
 319
 320                 fid = lo & 0x3f;
 321                 did = (lo >> 6) & 7;
 322                 if (boot_cpu_data.x86 == 0x10)
 323                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 324                 else
 325                         px->core_frequency = (100 * (fid + 8)) >> did;
 326         }
 327 }
 328 #else
 329 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 330 #endif
 331
 332 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 333 {
 334         int result = 0;
 335         acpi_status status = AE_OK;
 336         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 337         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 338         struct acpi_buffer state = { 0, NULL };
 339         union acpi_object *pss = NULL;
 340         int i;
 341         int last_invalid = -1;
 342
 343
 344         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 345         if (ACPI_FAILURE(status)) {
 346                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 347                 return -ENODEV;
 348         }
 349
 350         pss = buffer.pointer;
 351         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 352                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 353                 result = -EFAULT;
 354                 goto end;
 355         }
 356
 357         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 358                           pss->package.count));
 359
 360         pr->performance->state_count = pss->package.count;
 361         pr->performance->states =
 362             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 363                     GFP_KERNEL);
 364         if (!pr->performance->states) {
 365                 result = -ENOMEM;
 366                 goto end;
 367         }
 368
 369         for (i = 0; i < pr->performance->state_count; i++) {
 370
 371                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 372
 373                 state.length = sizeof(struct acpi_processor_px);
 374                 state.pointer = px;
 375
 376                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 377
 378                 status = acpi_extract_package(&(pss->package.elements[i]),
 379                                               &format, &state);
 380                 if (ACPI_FAILURE(status)) {
 381                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 382                         result = -EFAULT;
 383                         kfree(pr->performance->states);
 384                         goto end;
 385                 }
 386
 387                 amd_fixup_frequency(px, i);
 388
 389                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 390                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 391                                   i,
 392                                   (u32) px->core_frequency,
 393                                   (u32) px->power,
 394                                   (u32) px->transition_latency,
 395                                   (u32) px->bus_master_latency,
 396                                   (u32) px->control, (u32) px->status));
 397
 398                 /*
 399                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 400                  */
 401                 if (!px->core_frequency ||
 402                     ((u32)(px->core_frequency * 1000) !=
 403                      (px->core_frequency * 1000))) {
 404                         printk(KERN_ERR FW_BUG PREFIX
 405                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 406                                pr->id, px->core_frequency);
 407                         if (last_invalid == -1)
 408                                 last_invalid = i;
 409                 } else {
 410                         if (last_invalid != -1) {
 411                                 /*
 412                                  * Copy this valid entry over last_invalid entry
 413                                  */
 414                                 memcpy(&(pr->performance->states[last_invalid]),
 415                                        px, sizeof(struct acpi_processor_px));
 416                                 ++last_invalid;
 417                         }
 418                 }
 419         }
 420
 421         if (last_invalid == 0) {
 422                 printk(KERN_ERR FW_BUG PREFIX
 423                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 424                 result = -EFAULT;
 425                 kfree(pr->performance->states);
 426                 pr->performance->states = NULL;
 427         }
 428
 429         if (last_invalid > 0)
 430                 pr->performance->state_count = last_invalid;
 431
 432       end:
 433         kfree(buffer.pointer);
 434
 435         return result;
 436 }
 437
 438 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 439 {
 440         int result = 0;
 441
 442         if (!pr || !pr->performance || !pr->handle)
 443                 return -EINVAL;
 444
 445         if (!acpi_has_method(pr->handle, "_PCT")) {
 446                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 447                                   "ACPI-based processor performance control unavailable\n"));
 448                 return -ENODEV;
 449         }
 450
 451         result = acpi_processor_get_performance_control(pr);
 452         if (result)
 453                 goto update_bios;
 454
 455         result = acpi_processor_get_performance_states(pr);
 456         if (result)
 457                 goto update_bios;
 458
 459         /* We need to call _PPC once when cpufreq starts */
 460         if (ignore_ppc != 1)
 461                 result = acpi_processor_get_platform_limit(pr);
 462
 463         return result;
 464
 465         /*
 466          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 467          * the BIOS is older than the CPU and does not know its frequencies
 468          */
 469  update_bios:
 470 #ifdef CONFIG_X86
 471         if (acpi_has_method(pr->handle, "_PPC")) {
 472                 if(boot_cpu_has(X86_FEATURE_EST))
 473                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 474                                "frequency support\n");
 475         }
 476 #endif
 477         return result;
 478 }
 479 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 480 int acpi_processor_notify_smm(struct module *calling_module)
 481 {
 482         acpi_status status;
 483         static int is_done = 0;
 484
 485
 486         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 487                 return -EBUSY;
 488
 489         if (!try_module_get(calling_module))
 490                 return -EINVAL;
 491
 492         /* is_done is set to negative if an error occurred,
 493          * and to postitive if _no_ error occurred, but SMM
 494          * was already notified. This avoids double notification
 495          * which might lead to unexpected results...
 496          */
 497         if (is_done > 0) {
 498                 module_put(calling_module);
 499                 return 0;
 500         } else if (is_done < 0) {
 501                 module_put(calling_module);
 502                 return is_done;
 503         }
 504
 505         is_done = -EIO;
 506
 507         /* Can't write pstate_control to smi_command if either value is zero */
 508         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 509                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 510                 module_put(calling_module);
 511                 return 0;
 512         }
 513
 514         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 515                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 516                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 517
 518         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 519                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 520         if (ACPI_FAILURE(status)) {
 521                 ACPI_EXCEPTION((AE_INFO, status,
 522                                 "Failed to write pstate_control [0x%x] to "
 523                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 524                                 acpi_gbl_FADT.smi_command));
 525                 module_put(calling_module);
 526                 return status;
 527         }
 528
 529         /* Success. If there's no _PPC, we need to fear nothing, so
 530          * we can allow the cpufreq driver to be rmmod'ed. */
 531         is_done = 1;
 532
 533         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 534                 module_put(calling_module);
 535
 536         return 0;
 537 }
 538
 539 EXPORT_SYMBOL(acpi_processor_notify_smm);
 540
 541 static int acpi_processor_get_psd(struct acpi_processor *pr)
 542 {
 543         int result = 0;
 544         acpi_status status = AE_OK;
 545         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 546         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 547         struct acpi_buffer state = {0, NULL};
 548         union acpi_object  *psd = NULL;
 549         struct acpi_psd_package *pdomain;
 550
 551         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 552         if (ACPI_FAILURE(status)) {
 553                 return -ENODEV;
 554         }
 555
 556         psd = buffer.pointer;
 557         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 558                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 559                 result = -EFAULT;
 560                 goto end;
 561         }
 562
 563         if (psd->package.count != 1) {
 564                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 565                 result = -EFAULT;
 566                 goto end;
 567         }
 568
 569         pdomain = &(pr->performance->domain_info);
 570
 571         state.length = sizeof(struct acpi_psd_package);
 572         state.pointer = pdomain;
 573
 574         status = acpi_extract_package(&(psd->package.elements[0]),
 575                 &format, &state);
 576         if (ACPI_FAILURE(status)) {
 577                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 578                 result = -EFAULT;
 579                 goto end;
 580         }
 581
 582         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 583                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 584                 result = -EFAULT;
 585                 goto end;
 586         }
 587
 588         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 589                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 590                 result = -EFAULT;
 591                 goto end;
 592         }
 593
 594         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 595             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 596             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 597                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 598                 result = -EFAULT;
 599                 goto end;
 600         }
 601 end:
 602         kfree(buffer.pointer);
 603         return result;
 604 }
 605
 606 int acpi_processor_preregister_performance(
 607                 struct acpi_processor_performance __percpu *performance)
 608 {
 609         int count_target;
 610         int retval = 0;
 611         unsigned int i, j;
 612         cpumask_var_t covered_cpus;
 613         struct acpi_processor *pr;
 614         struct acpi_psd_package *pdomain;
 615         struct acpi_processor *match_pr;
 616         struct acpi_psd_package *match_pdomain;
 617
 618         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 619                 return -ENOMEM;
 620
 621         mutex_lock(&performance_mutex);
 622
 623         /*
 624          * Check if another driver has already registered, and abort before
 625          * changing pr->performance if it has. Check input data as well.
 626          */
 627         for_each_possible_cpu(i) {
 628                 pr = per_cpu(processors, i);
 629                 if (!pr) {
 630                         /* Look only at processors in ACPI namespace */
 631                         continue;
 632                 }
 633
 634                 if (pr->performance) {
 635                         retval = -EBUSY;
 636                         goto err_out;
 637                 }
 638
 639                 if (!performance || !per_cpu_ptr(performance, i)) {
 640                         retval = -EINVAL;
 641                         goto err_out;
 642                 }
 643         }
 644
 645         /* Call _PSD for all CPUs */
 646         for_each_possible_cpu(i) {
 647                 pr = per_cpu(processors, i);
 648                 if (!pr)
 649                         continue;
 650
 651                 pr->performance = per_cpu_ptr(performance, i);
 652                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 653                 if (acpi_processor_get_psd(pr)) {
 654                         retval = -EINVAL;
 655                         continue;
 656                 }
 657         }
 658         if (retval)
 659                 goto err_ret;
 660
 661         /*
 662          * Now that we have _PSD data from all CPUs, lets setup P-state
 663          * domain info.
 664          */
 665         for_each_possible_cpu(i) {
 666                 pr = per_cpu(processors, i);
 667                 if (!pr)
 668                         continue;
 669
 670                 if (cpumask_test_cpu(i, covered_cpus))
 671                         continue;
 672
 673                 pdomain = &(pr->performance->domain_info);
 674                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 675                 cpumask_set_cpu(i, covered_cpus);
 676                 if (pdomain->num_processors <= 1)
 677                         continue;
 678
 679                 /* Validate the Domain info */
 680                 count_target = pdomain->num_processors;
 681                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 682                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 683                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 684                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 685                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 686                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 687
 688                 for_each_possible_cpu(j) {
 689                         if (i == j)
 690                                 continue;
 691
 692                         match_pr = per_cpu(processors, j);
 693                         if (!match_pr)
 694                                 continue;
 695
 696                         match_pdomain = &(match_pr->performance->domain_info);
 697                         if (match_pdomain->domain != pdomain->domain)
 698                                 continue;
 699
 700                         /* Here i and j are in the same domain */
 701
 702                         if (match_pdomain->num_processors != count_target) {
 703                                 retval = -EINVAL;
 704                                 goto err_ret;
 705                         }
 706
 707                         if (pdomain->coord_type != match_pdomain->coord_type) {
 708                                 retval = -EINVAL;
 709                                 goto err_ret;
 710                         }
 711
 712                         cpumask_set_cpu(j, covered_cpus);
 713                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 714                 }
 715
 716                 for_each_possible_cpu(j) {
 717                         if (i == j)
 718                                 continue;
 719
 720                         match_pr = per_cpu(processors, j);
 721                         if (!match_pr)
 722                                 continue;
 723
 724                         match_pdomain = &(match_pr->performance->domain_info);
 725                         if (match_pdomain->domain != pdomain->domain)
 726                                 continue;
 727
 728                         match_pr->performance->shared_type =
 729                                         pr->performance->shared_type;
 730                         cpumask_copy(match_pr->performance->shared_cpu_map,
 731                                      pr->performance->shared_cpu_map);
 732                 }
 733         }
 734
 735 err_ret:
 736         for_each_possible_cpu(i) {
 737                 pr = per_cpu(processors, i);
 738                 if (!pr || !pr->performance)
 739                         continue;
 740
 741                 /* Assume no coordination on any error parsing domain info */
 742                 if (retval) {
 743                         cpumask_clear(pr->performance->shared_cpu_map);
 744                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 745                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 746                 }
 747                 pr->performance = NULL; /* Will be set for real in register */
 748         }
 749
 750 err_out:
 751         mutex_unlock(&performance_mutex);
 752         free_cpumask_var(covered_cpus);
 753         return retval;
 754 }
 755 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 756
 757 int
 758 acpi_processor_register_performance(struct acpi_processor_performance
 759                                     *performance, unsigned int cpu)
 760 {
 761         struct acpi_processor *pr;
 762
 763         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 764                 return -EINVAL;
 765
 766         mutex_lock(&performance_mutex);
 767
 768         pr = per_cpu(processors, cpu);
 769         if (!pr) {
 770                 mutex_unlock(&performance_mutex);
 771                 return -ENODEV;
 772         }
 773
 774         if (pr->performance) {
 775                 mutex_unlock(&performance_mutex);
 776                 return -EBUSY;
 777         }
 778
 779         WARN_ON(!performance);
 780
 781         pr->performance = performance;
 782
 783         if (acpi_processor_get_performance_info(pr)) {
 784                 pr->performance = NULL;
 785                 mutex_unlock(&performance_mutex);
 786                 return -EIO;
 787         }
 788
 789         mutex_unlock(&performance_mutex);
 790         return 0;
 791 }
 792
 793 EXPORT_SYMBOL(acpi_processor_register_performance);
 794
 795 void
 796 acpi_processor_unregister_performance(struct acpi_processor_performance
 797                                       *performance, unsigned int cpu)
 798 {
 799         struct acpi_processor *pr;
 800
 801         mutex_lock(&performance_mutex);
 802
 803         pr = per_cpu(processors, cpu);
 804         if (!pr) {
 805                 mutex_unlock(&performance_mutex);
 806                 return;
 807         }
 808
 809         if (pr->performance)
 810                 kfree(pr->performance->states);
 811         pr->performance = NULL;
 812
 813         mutex_unlock(&performance_mutex);
 814
 815         return;
 816 }
 817
 818 EXPORT_SYMBOL(acpi_processor_unregister_performance);