kernel/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         if (acpi_has_method(handle, "_OST"))
 160                 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
 161                                   status, NULL);
 162 }
 163
 164 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 165 {
 166         int ret;
 167
 168         if (ignore_ppc) {
 169                 /*
 170                  * Only when it is notification event, the _OST object
 171                  * will be evaluated. Otherwise it is skipped.
 172                  */
 173                 if (event_flag)
 174                         acpi_processor_ppc_ost(pr->handle, 1);
 175                 return 0;
 176         }
 177
 178         ret = acpi_processor_get_platform_limit(pr);
 179         /*
 180          * Only when it is notification event, the _OST object
 181          * will be evaluated. Otherwise it is skipped.
 182          */
 183         if (event_flag) {
 184                 if (ret < 0)
 185                         acpi_processor_ppc_ost(pr->handle, 1);
 186                 else
 187                         acpi_processor_ppc_ost(pr->handle, 0);
 188         }
 189         if (ret < 0)
 190                 return (ret);
 191         else
 192                 return cpufreq_update_policy(pr->id);
 193 }
 194
 195 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 196 {
 197         struct acpi_processor *pr;
 198
 199         pr = per_cpu(processors, cpu);
 200         if (!pr || !pr->performance || !pr->performance->state_count)
 201                 return -ENODEV;
 202         *limit = pr->performance->states[pr->performance_platform_limit].
 203                 core_frequency * 1000;
 204         return 0;
 205 }
 206 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 207
 208 void acpi_processor_ppc_init(void)
 209 {
 210         if (!cpufreq_register_notifier
 211             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 212                 acpi_processor_ppc_status |= PPC_REGISTERED;
 213         else
 214                 printk(KERN_DEBUG
 215                        "Warning: Processor Platform Limit not supported.\n");
 216 }
 217
 218 void acpi_processor_ppc_exit(void)
 219 {
 220         if (acpi_processor_ppc_status & PPC_REGISTERED)
 221                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 222                                             CPUFREQ_POLICY_NOTIFIER);
 223
 224         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 225 }
 226
 227 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 228 {
 229         int result = 0;
 230         acpi_status status = 0;
 231         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 232         union acpi_object *pct = NULL;
 233         union acpi_object obj = { 0 };
 234
 235
 236         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 237         if (ACPI_FAILURE(status)) {
 238                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 239                 return -ENODEV;
 240         }
 241
 242         pct = (union acpi_object *)buffer.pointer;
 243         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 244             || (pct->package.count != 2)) {
 245                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 246                 result = -EFAULT;
 247                 goto end;
 248         }
 249
 250         /*
 251          * control_register
 252          */
 253
 254         obj = pct->package.elements[0];
 255
 256         if ((obj.type != ACPI_TYPE_BUFFER)
 257             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 258             || (obj.buffer.pointer == NULL)) {
 259                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 260                 result = -EFAULT;
 261                 goto end;
 262         }
 263         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 264                sizeof(struct acpi_pct_register));
 265
 266         /*
 267          * status_register
 268          */
 269
 270         obj = pct->package.elements[1];
 271
 272         if ((obj.type != ACPI_TYPE_BUFFER)
 273             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 274             || (obj.buffer.pointer == NULL)) {
 275                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 276                 result = -EFAULT;
 277                 goto end;
 278         }
 279
 280         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 281                sizeof(struct acpi_pct_register));
 282
 283       end:
 284         kfree(buffer.pointer);
 285
 286         return result;
 287 }
 288
 289 #ifdef CONFIG_X86
 290 /*
 291  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 292  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 293  */
 294 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 295 {
 296         u32 hi, lo, fid, did;
 297         int index = px->control & 0x00000007;
 298
 299         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 300                 return;
 301
 302         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 303             || boot_cpu_data.x86 == 0x11) {
 304                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 305                 /*
 306                  * MSR C001_0064+:
 307                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 308                  */
 309                 if (!(hi & BIT(31)))
 310                         return;
 311
 312                 fid = lo & 0x3f;
 313                 did = (lo >> 6) & 7;
 314                 if (boot_cpu_data.x86 == 0x10)
 315                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 316                 else
 317                         px->core_frequency = (100 * (fid + 8)) >> did;
 318         }
 319 }
 320 #else
 321 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 322 #endif
 323
 324 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 325 {
 326         int result = 0;
 327         acpi_status status = AE_OK;
 328         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 329         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 330         struct acpi_buffer state = { 0, NULL };
 331         union acpi_object *pss = NULL;
 332         int i;
 333         int last_invalid = -1;
 334
 335
 336         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 337         if (ACPI_FAILURE(status)) {
 338                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 339                 return -ENODEV;
 340         }
 341
 342         pss = buffer.pointer;
 343         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 344                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 345                 result = -EFAULT;
 346                 goto end;
 347         }
 348
 349         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 350                           pss->package.count));
 351
 352         pr->performance->state_count = pss->package.count;
 353         pr->performance->states =
 354             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 355                     GFP_KERNEL);
 356         if (!pr->performance->states) {
 357                 result = -ENOMEM;
 358                 goto end;
 359         }
 360
 361         for (i = 0; i < pr->performance->state_count; i++) {
 362
 363                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 364
 365                 state.length = sizeof(struct acpi_processor_px);
 366                 state.pointer = px;
 367
 368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 369
 370                 status = acpi_extract_package(&(pss->package.elements[i]),
 371                                               &format, &state);
 372                 if (ACPI_FAILURE(status)) {
 373                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 374                         result = -EFAULT;
 375                         kfree(pr->performance->states);
 376                         goto end;
 377                 }
 378
 379                 amd_fixup_frequency(px, i);
 380
 381                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 382                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 383                                   i,
 384                                   (u32) px->core_frequency,
 385                                   (u32) px->power,
 386                                   (u32) px->transition_latency,
 387                                   (u32) px->bus_master_latency,
 388                                   (u32) px->control, (u32) px->status));
 389
 390                 /*
 391                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 392                  */
 393                 if (!px->core_frequency ||
 394                     ((u32)(px->core_frequency * 1000) !=
 395                      (px->core_frequency * 1000))) {
 396                         printk(KERN_ERR FW_BUG PREFIX
 397                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 398                                pr->id, px->core_frequency);
 399                         if (last_invalid == -1)
 400                                 last_invalid = i;
 401                 } else {
 402                         if (last_invalid != -1) {
 403                                 /*
 404                                  * Copy this valid entry over last_invalid entry
 405                                  */
 406                                 memcpy(&(pr->performance->states[last_invalid]),
 407                                        px, sizeof(struct acpi_processor_px));
 408                                 ++last_invalid;
 409                         }
 410                 }
 411         }
 412
 413         if (last_invalid == 0) {
 414                 printk(KERN_ERR FW_BUG PREFIX
 415                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 416                 result = -EFAULT;
 417                 kfree(pr->performance->states);
 418                 pr->performance->states = NULL;
 419         }
 420
 421         if (last_invalid > 0)
 422                 pr->performance->state_count = last_invalid;
 423
 424       end:
 425         kfree(buffer.pointer);
 426
 427         return result;
 428 }
 429
 430 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 431 {
 432         int result = 0;
 433
 434         if (!pr || !pr->performance || !pr->handle)
 435                 return -EINVAL;
 436
 437         if (!acpi_has_method(pr->handle, "_PCT")) {
 438                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 439                                   "ACPI-based processor performance control unavailable\n"));
 440                 return -ENODEV;
 441         }
 442
 443         result = acpi_processor_get_performance_control(pr);
 444         if (result)
 445                 goto update_bios;
 446
 447         result = acpi_processor_get_performance_states(pr);
 448         if (result)
 449                 goto update_bios;
 450
 451         /* We need to call _PPC once when cpufreq starts */
 452         if (ignore_ppc != 1)
 453                 result = acpi_processor_get_platform_limit(pr);
 454
 455         return result;
 456
 457         /*
 458          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 459          * the BIOS is older than the CPU and does not know its frequencies
 460          */
 461  update_bios:
 462 #ifdef CONFIG_X86
 463         if (acpi_has_method(pr->handle, "_PPC")) {
 464                 if(boot_cpu_has(X86_FEATURE_EST))
 465                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 466                                "frequency support\n");
 467         }
 468 #endif
 469         return result;
 470 }
 471 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 472 int acpi_processor_notify_smm(struct module *calling_module)
 473 {
 474         acpi_status status;
 475         static int is_done = 0;
 476
 477
 478         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 479                 return -EBUSY;
 480
 481         if (!try_module_get(calling_module))
 482                 return -EINVAL;
 483
 484         /* is_done is set to negative if an error occurred,
 485          * and to postitive if _no_ error occurred, but SMM
 486          * was already notified. This avoids double notification
 487          * which might lead to unexpected results...
 488          */
 489         if (is_done > 0) {
 490                 module_put(calling_module);
 491                 return 0;
 492         } else if (is_done < 0) {
 493                 module_put(calling_module);
 494                 return is_done;
 495         }
 496
 497         is_done = -EIO;
 498
 499         /* Can't write pstate_control to smi_command if either value is zero */
 500         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 501                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 502                 module_put(calling_module);
 503                 return 0;
 504         }
 505
 506         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 507                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 508                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 509
 510         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 511                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 512         if (ACPI_FAILURE(status)) {
 513                 ACPI_EXCEPTION((AE_INFO, status,
 514                                 "Failed to write pstate_control [0x%x] to "
 515                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 516                                 acpi_gbl_FADT.smi_command));
 517                 module_put(calling_module);
 518                 return status;
 519         }
 520
 521         /* Success. If there's no _PPC, we need to fear nothing, so
 522          * we can allow the cpufreq driver to be rmmod'ed. */
 523         is_done = 1;
 524
 525         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 526                 module_put(calling_module);
 527
 528         return 0;
 529 }
 530
 531 EXPORT_SYMBOL(acpi_processor_notify_smm);
 532
 533 static int acpi_processor_get_psd(struct acpi_processor *pr)
 534 {
 535         int result = 0;
 536         acpi_status status = AE_OK;
 537         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 538         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 539         struct acpi_buffer state = {0, NULL};
 540         union acpi_object  *psd = NULL;
 541         struct acpi_psd_package *pdomain;
 542
 543         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 544         if (ACPI_FAILURE(status)) {
 545                 return -ENODEV;
 546         }
 547
 548         psd = buffer.pointer;
 549         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 550                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 551                 result = -EFAULT;
 552                 goto end;
 553         }
 554
 555         if (psd->package.count != 1) {
 556                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 557                 result = -EFAULT;
 558                 goto end;
 559         }
 560
 561         pdomain = &(pr->performance->domain_info);
 562
 563         state.length = sizeof(struct acpi_psd_package);
 564         state.pointer = pdomain;
 565
 566         status = acpi_extract_package(&(psd->package.elements[0]),
 567                 &format, &state);
 568         if (ACPI_FAILURE(status)) {
 569                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 570                 result = -EFAULT;
 571                 goto end;
 572         }
 573
 574         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 575                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 576                 result = -EFAULT;
 577                 goto end;
 578         }
 579
 580         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 581                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 582                 result = -EFAULT;
 583                 goto end;
 584         }
 585
 586         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 587             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 588             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 589                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 590                 result = -EFAULT;
 591                 goto end;
 592         }
 593 end:
 594         kfree(buffer.pointer);
 595         return result;
 596 }
 597
 598 int acpi_processor_preregister_performance(
 599                 struct acpi_processor_performance __percpu *performance)
 600 {
 601         int count_target;
 602         int retval = 0;
 603         unsigned int i, j;
 604         cpumask_var_t covered_cpus;
 605         struct acpi_processor *pr;
 606         struct acpi_psd_package *pdomain;
 607         struct acpi_processor *match_pr;
 608         struct acpi_psd_package *match_pdomain;
 609
 610         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 611                 return -ENOMEM;
 612
 613         mutex_lock(&performance_mutex);
 614
 615         /*
 616          * Check if another driver has already registered, and abort before
 617          * changing pr->performance if it has. Check input data as well.
 618          */
 619         for_each_possible_cpu(i) {
 620                 pr = per_cpu(processors, i);
 621                 if (!pr) {
 622                         /* Look only at processors in ACPI namespace */
 623                         continue;
 624                 }
 625
 626                 if (pr->performance) {
 627                         retval = -EBUSY;
 628                         goto err_out;
 629                 }
 630
 631                 if (!performance || !per_cpu_ptr(performance, i)) {
 632                         retval = -EINVAL;
 633                         goto err_out;
 634                 }
 635         }
 636
 637         /* Call _PSD for all CPUs */
 638         for_each_possible_cpu(i) {
 639                 pr = per_cpu(processors, i);
 640                 if (!pr)
 641                         continue;
 642
 643                 pr->performance = per_cpu_ptr(performance, i);
 644                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 645                 if (acpi_processor_get_psd(pr)) {
 646                         retval = -EINVAL;
 647                         continue;
 648                 }
 649         }
 650         if (retval)
 651                 goto err_ret;
 652
 653         /*
 654          * Now that we have _PSD data from all CPUs, lets setup P-state
 655          * domain info.
 656          */
 657         for_each_possible_cpu(i) {
 658                 pr = per_cpu(processors, i);
 659                 if (!pr)
 660                         continue;
 661
 662                 if (cpumask_test_cpu(i, covered_cpus))
 663                         continue;
 664
 665                 pdomain = &(pr->performance->domain_info);
 666                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 667                 cpumask_set_cpu(i, covered_cpus);
 668                 if (pdomain->num_processors <= 1)
 669                         continue;
 670
 671                 /* Validate the Domain info */
 672                 count_target = pdomain->num_processors;
 673                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 674                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 675                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 676                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 677                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 678                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 679
 680                 for_each_possible_cpu(j) {
 681                         if (i == j)
 682                                 continue;
 683
 684                         match_pr = per_cpu(processors, j);
 685                         if (!match_pr)
 686                                 continue;
 687
 688                         match_pdomain = &(match_pr->performance->domain_info);
 689                         if (match_pdomain->domain != pdomain->domain)
 690                                 continue;
 691
 692                         /* Here i and j are in the same domain */
 693
 694                         if (match_pdomain->num_processors != count_target) {
 695                                 retval = -EINVAL;
 696                                 goto err_ret;
 697                         }
 698
 699                         if (pdomain->coord_type != match_pdomain->coord_type) {
 700                                 retval = -EINVAL;
 701                                 goto err_ret;
 702                         }
 703
 704                         cpumask_set_cpu(j, covered_cpus);
 705                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 706                 }
 707
 708                 for_each_possible_cpu(j) {
 709                         if (i == j)
 710                                 continue;
 711
 712                         match_pr = per_cpu(processors, j);
 713                         if (!match_pr)
 714                                 continue;
 715
 716                         match_pdomain = &(match_pr->performance->domain_info);
 717                         if (match_pdomain->domain != pdomain->domain)
 718                                 continue;
 719
 720                         match_pr->performance->shared_type =
 721                                         pr->performance->shared_type;
 722                         cpumask_copy(match_pr->performance->shared_cpu_map,
 723                                      pr->performance->shared_cpu_map);
 724                 }
 725         }
 726
 727 err_ret:
 728         for_each_possible_cpu(i) {
 729                 pr = per_cpu(processors, i);
 730                 if (!pr || !pr->performance)
 731                         continue;
 732
 733                 /* Assume no coordination on any error parsing domain info */
 734                 if (retval) {
 735                         cpumask_clear(pr->performance->shared_cpu_map);
 736                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 737                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 738                 }
 739                 pr->performance = NULL; /* Will be set for real in register */
 740         }
 741
 742 err_out:
 743         mutex_unlock(&performance_mutex);
 744         free_cpumask_var(covered_cpus);
 745         return retval;
 746 }
 747 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 748
 749 int
 750 acpi_processor_register_performance(struct acpi_processor_performance
 751                                     *performance, unsigned int cpu)
 752 {
 753         struct acpi_processor *pr;
 754
 755         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 756                 return -EINVAL;
 757
 758         mutex_lock(&performance_mutex);
 759
 760         pr = per_cpu(processors, cpu);
 761         if (!pr) {
 762                 mutex_unlock(&performance_mutex);
 763                 return -ENODEV;
 764         }
 765
 766         if (pr->performance) {
 767                 mutex_unlock(&performance_mutex);
 768                 return -EBUSY;
 769         }
 770
 771         WARN_ON(!performance);
 772
 773         pr->performance = performance;
 774
 775         if (acpi_processor_get_performance_info(pr)) {
 776                 pr->performance = NULL;
 777                 mutex_unlock(&performance_mutex);
 778                 return -EIO;
 779         }
 780
 781         mutex_unlock(&performance_mutex);
 782         return 0;
 783 }
 784
 785 EXPORT_SYMBOL(acpi_processor_register_performance);
 786
 787 void
 788 acpi_processor_unregister_performance(struct acpi_processor_performance
 789                                       *performance, unsigned int cpu)
 790 {
 791         struct acpi_processor *pr;
 792
 793         mutex_lock(&performance_mutex);
 794
 795         pr = per_cpu(processors, cpu);
 796         if (!pr) {
 797                 mutex_unlock(&performance_mutex);
 798                 return;
 799         }
 800
 801         if (pr->performance)
 802                 kfree(pr->performance->states);
 803         pr->performance = NULL;
 804
 805         mutex_unlock(&performance_mutex);
 806
 807         return;
 808 }
 809
 810 EXPORT_SYMBOL(acpi_processor_unregister_performance);