Pileus Git - ~andy/linux/blob - 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
  35 #ifdef CONFIG_X86
  36 #include <asm/cpufeature.h>
  37 #endif
  38
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <acpi/processor.h>
  42
  43 #define PREFIX "ACPI: "
  44
  45 #define ACPI_PROCESSOR_CLASS            "processor"
  46 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  47 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  48 ACPI_MODULE_NAME("processor_perflib");
  49
  50 static DEFINE_MUTEX(performance_mutex);
  51
  52 /*
  53  * _PPC support is implemented as a CPUfreq policy notifier:
  54  * This means each time a CPUfreq driver registered also with
  55  * the ACPI core is asked to change the speed policy, the maximum
  56  * value is adjusted so that it is within the platform limit.
  57  *
  58  * Also, when a new platform limit value is detected, the CPUfreq
  59  * policy is adjusted accordingly.
  60  */
  61
  62 /* ignore_ppc:
  63  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  64  *       ignore _PPC
  65  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  66  *  1 -> ignore _PPC totally -> forced by user through boot param
  67  */
  68 static int ignore_ppc = -1;
  69 module_param(ignore_ppc, int, 0644);
  70 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  71                  "limited by BIOS, this should help");
  72
  73 #define PPC_REGISTERED   1
  74 #define PPC_IN_USE       2
  75
  76 static int acpi_processor_ppc_status;
  77
  78 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  79                                        unsigned long event, void *data)
  80 {
  81         struct cpufreq_policy *policy = data;
  82         struct acpi_processor *pr;
  83         unsigned int ppc = 0;
  84
  85         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  86                 ignore_ppc = 0;
  87                 return 0;
  88         }
  89
  90         if (ignore_ppc)
  91                 return 0;
  92
  93         if (event != CPUFREQ_INCOMPATIBLE)
  94                 return 0;
  95
  96         mutex_lock(&performance_mutex);
  97
  98         pr = per_cpu(processors, policy->cpu);
  99         if (!pr || !pr->performance)
 100                 goto out;
 101
 102         ppc = (unsigned int)pr->performance_platform_limit;
 103
 104         if (ppc >= pr->performance->state_count)
 105                 goto out;
 106
 107         cpufreq_verify_within_limits(policy, 0,
 108                                      pr->performance->states[ppc].
 109                                      core_frequency * 1000);
 110
 111       out:
 112         mutex_unlock(&performance_mutex);
 113
 114         return 0;
 115 }
 116
 117 static struct notifier_block acpi_ppc_notifier_block = {
 118         .notifier_call = acpi_processor_ppc_notifier,
 119 };
 120
 121 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 122 {
 123         acpi_status status = 0;
 124         unsigned long long ppc = 0;
 125
 126
 127         if (!pr)
 128                 return -EINVAL;
 129
 130         /*
 131          * _PPC indicates the maximum state currently supported by the platform
 132          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 133          */
 134         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 135
 136         if (status != AE_NOT_FOUND)
 137                 acpi_processor_ppc_status |= PPC_IN_USE;
 138
 139         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 140                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 141                 return -ENODEV;
 142         }
 143
 144         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 145                        (int)ppc, ppc ? "" : "not");
 146
 147         pr->performance_platform_limit = (int)ppc;
 148
 149         return 0;
 150 }
 151
 152 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 153 /*
 154  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 155  * @handle: ACPI processor handle
 156  * @status: the status code of _PPC evaluation
 157  *      0: success. OSPM is now using the performance state specificed.
 158  *      1: failure. OSPM has not changed the number of P-states in use
 159  */
 160 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 161 {
 162         union acpi_object params[2] = {
 163                 {.type = ACPI_TYPE_INTEGER,},
 164                 {.type = ACPI_TYPE_INTEGER,},
 165         };
 166         struct acpi_object_list arg_list = {2, params};
 167
 168         if (acpi_has_method(handle, "_OST")) {
 169                 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 170                 params[1].integer.value =  status;
 171                 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 172         }
 173 }
 174
 175 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 176 {
 177         int ret;
 178
 179         if (ignore_ppc) {
 180                 /*
 181                  * Only when it is notification event, the _OST object
 182                  * will be evaluated. Otherwise it is skipped.
 183                  */
 184                 if (event_flag)
 185                         acpi_processor_ppc_ost(pr->handle, 1);
 186                 return 0;
 187         }
 188
 189         ret = acpi_processor_get_platform_limit(pr);
 190         /*
 191          * Only when it is notification event, the _OST object
 192          * will be evaluated. Otherwise it is skipped.
 193          */
 194         if (event_flag) {
 195                 if (ret < 0)
 196                         acpi_processor_ppc_ost(pr->handle, 1);
 197                 else
 198                         acpi_processor_ppc_ost(pr->handle, 0);
 199         }
 200         if (ret < 0)
 201                 return (ret);
 202         else
 203                 return cpufreq_update_policy(pr->id);
 204 }
 205
 206 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 207 {
 208         struct acpi_processor *pr;
 209
 210         pr = per_cpu(processors, cpu);
 211         if (!pr || !pr->performance || !pr->performance->state_count)
 212                 return -ENODEV;
 213         *limit = pr->performance->states[pr->performance_platform_limit].
 214                 core_frequency * 1000;
 215         return 0;
 216 }
 217 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 218
 219 void acpi_processor_ppc_init(void)
 220 {
 221         if (!cpufreq_register_notifier
 222             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 223                 acpi_processor_ppc_status |= PPC_REGISTERED;
 224         else
 225                 printk(KERN_DEBUG
 226                        "Warning: Processor Platform Limit not supported.\n");
 227 }
 228
 229 void acpi_processor_ppc_exit(void)
 230 {
 231         if (acpi_processor_ppc_status & PPC_REGISTERED)
 232                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 233                                             CPUFREQ_POLICY_NOTIFIER);
 234
 235         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 236 }
 237
 238 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 239 {
 240         int result = 0;
 241         acpi_status status = 0;
 242         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 243         union acpi_object *pct = NULL;
 244         union acpi_object obj = { 0 };
 245
 246
 247         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 248         if (ACPI_FAILURE(status)) {
 249                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 250                 return -ENODEV;
 251         }
 252
 253         pct = (union acpi_object *)buffer.pointer;
 254         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 255             || (pct->package.count != 2)) {
 256                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 257                 result = -EFAULT;
 258                 goto end;
 259         }
 260
 261         /*
 262          * control_register
 263          */
 264
 265         obj = pct->package.elements[0];
 266
 267         if ((obj.type != ACPI_TYPE_BUFFER)
 268             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 269             || (obj.buffer.pointer == NULL)) {
 270                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 271                 result = -EFAULT;
 272                 goto end;
 273         }
 274         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 275                sizeof(struct acpi_pct_register));
 276
 277         /*
 278          * status_register
 279          */
 280
 281         obj = pct->package.elements[1];
 282
 283         if ((obj.type != ACPI_TYPE_BUFFER)
 284             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 285             || (obj.buffer.pointer == NULL)) {
 286                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 287                 result = -EFAULT;
 288                 goto end;
 289         }
 290
 291         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 292                sizeof(struct acpi_pct_register));
 293
 294       end:
 295         kfree(buffer.pointer);
 296
 297         return result;
 298 }
 299
 300 #ifdef CONFIG_X86
 301 /*
 302  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 303  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 304  */
 305 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 306 {
 307         u32 hi, lo, fid, did;
 308         int index = px->control & 0x00000007;
 309
 310         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 311                 return;
 312
 313         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 314             || boot_cpu_data.x86 == 0x11) {
 315                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 316                 /*
 317                  * MSR C001_0064+:
 318                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 319                  */
 320                 if (!(hi & BIT(31)))
 321                         return;
 322
 323                 fid = lo & 0x3f;
 324                 did = (lo >> 6) & 7;
 325                 if (boot_cpu_data.x86 == 0x10)
 326                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 327                 else
 328                         px->core_frequency = (100 * (fid + 8)) >> did;
 329         }
 330 }
 331 #else
 332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 333 #endif
 334
 335 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 336 {
 337         int result = 0;
 338         acpi_status status = AE_OK;
 339         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 340         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 341         struct acpi_buffer state = { 0, NULL };
 342         union acpi_object *pss = NULL;
 343         int i;
 344         int last_invalid = -1;
 345
 346
 347         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 348         if (ACPI_FAILURE(status)) {
 349                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 350                 return -ENODEV;
 351         }
 352
 353         pss = buffer.pointer;
 354         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 355                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 356                 result = -EFAULT;
 357                 goto end;
 358         }
 359
 360         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 361                           pss->package.count));
 362
 363         pr->performance->state_count = pss->package.count;
 364         pr->performance->states =
 365             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 366                     GFP_KERNEL);
 367         if (!pr->performance->states) {
 368                 result = -ENOMEM;
 369                 goto end;
 370         }
 371
 372         for (i = 0; i < pr->performance->state_count; i++) {
 373
 374                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 375
 376                 state.length = sizeof(struct acpi_processor_px);
 377                 state.pointer = px;
 378
 379                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 380
 381                 status = acpi_extract_package(&(pss->package.elements[i]),
 382                                               &format, &state);
 383                 if (ACPI_FAILURE(status)) {
 384                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 385                         result = -EFAULT;
 386                         kfree(pr->performance->states);
 387                         goto end;
 388                 }
 389
 390                 amd_fixup_frequency(px, i);
 391
 392                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 393                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 394                                   i,
 395                                   (u32) px->core_frequency,
 396                                   (u32) px->power,
 397                                   (u32) px->transition_latency,
 398                                   (u32) px->bus_master_latency,
 399                                   (u32) px->control, (u32) px->status));
 400
 401                 /*
 402                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 403                  */
 404                 if (!px->core_frequency ||
 405                     ((u32)(px->core_frequency * 1000) !=
 406                      (px->core_frequency * 1000))) {
 407                         printk(KERN_ERR FW_BUG PREFIX
 408                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 409                                pr->id, px->core_frequency);
 410                         if (last_invalid == -1)
 411                                 last_invalid = i;
 412                 } else {
 413                         if (last_invalid != -1) {
 414                                 /*
 415                                  * Copy this valid entry over last_invalid entry
 416                                  */
 417                                 memcpy(&(pr->performance->states[last_invalid]),
 418                                        px, sizeof(struct acpi_processor_px));
 419                                 ++last_invalid;
 420                         }
 421                 }
 422         }
 423
 424         if (last_invalid == 0) {
 425                 printk(KERN_ERR FW_BUG PREFIX
 426                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 427                 result = -EFAULT;
 428                 kfree(pr->performance->states);
 429                 pr->performance->states = NULL;
 430         }
 431
 432         if (last_invalid > 0)
 433                 pr->performance->state_count = last_invalid;
 434
 435       end:
 436         kfree(buffer.pointer);
 437
 438         return result;
 439 }
 440
 441 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 442 {
 443         int result = 0;
 444
 445         if (!pr || !pr->performance || !pr->handle)
 446                 return -EINVAL;
 447
 448         if (!acpi_has_method(pr->handle, "_PCT")) {
 449                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 450                                   "ACPI-based processor performance control unavailable\n"));
 451                 return -ENODEV;
 452         }
 453
 454         result = acpi_processor_get_performance_control(pr);
 455         if (result)
 456                 goto update_bios;
 457
 458         result = acpi_processor_get_performance_states(pr);
 459         if (result)
 460                 goto update_bios;
 461
 462         /* We need to call _PPC once when cpufreq starts */
 463         if (ignore_ppc != 1)
 464                 result = acpi_processor_get_platform_limit(pr);
 465
 466         return result;
 467
 468         /*
 469          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 470          * the BIOS is older than the CPU and does not know its frequencies
 471          */
 472  update_bios:
 473 #ifdef CONFIG_X86
 474         if (acpi_has_method(pr->handle, "_PPC")) {
 475                 if(boot_cpu_has(X86_FEATURE_EST))
 476                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 477                                "frequency support\n");
 478         }
 479 #endif
 480         return result;
 481 }
 482 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 483 int acpi_processor_notify_smm(struct module *calling_module)
 484 {
 485         acpi_status status;
 486         static int is_done = 0;
 487
 488
 489         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 490                 return -EBUSY;
 491
 492         if (!try_module_get(calling_module))
 493                 return -EINVAL;
 494
 495         /* is_done is set to negative if an error occurred,
 496          * and to postitive if _no_ error occurred, but SMM
 497          * was already notified. This avoids double notification
 498          * which might lead to unexpected results...
 499          */
 500         if (is_done > 0) {
 501                 module_put(calling_module);
 502                 return 0;
 503         } else if (is_done < 0) {
 504                 module_put(calling_module);
 505                 return is_done;
 506         }
 507
 508         is_done = -EIO;
 509
 510         /* Can't write pstate_control to smi_command if either value is zero */
 511         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 512                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 513                 module_put(calling_module);
 514                 return 0;
 515         }
 516
 517         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 518                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 519                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 520
 521         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 522                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 523         if (ACPI_FAILURE(status)) {
 524                 ACPI_EXCEPTION((AE_INFO, status,
 525                                 "Failed to write pstate_control [0x%x] to "
 526                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 527                                 acpi_gbl_FADT.smi_command));
 528                 module_put(calling_module);
 529                 return status;
 530         }
 531
 532         /* Success. If there's no _PPC, we need to fear nothing, so
 533          * we can allow the cpufreq driver to be rmmod'ed. */
 534         is_done = 1;
 535
 536         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 537                 module_put(calling_module);
 538
 539         return 0;
 540 }
 541
 542 EXPORT_SYMBOL(acpi_processor_notify_smm);
 543
 544 static int acpi_processor_get_psd(struct acpi_processor *pr)
 545 {
 546         int result = 0;
 547         acpi_status status = AE_OK;
 548         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 549         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 550         struct acpi_buffer state = {0, NULL};
 551         union acpi_object  *psd = NULL;
 552         struct acpi_psd_package *pdomain;
 553
 554         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 555         if (ACPI_FAILURE(status)) {
 556                 return -ENODEV;
 557         }
 558
 559         psd = buffer.pointer;
 560         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 561                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 562                 result = -EFAULT;
 563                 goto end;
 564         }
 565
 566         if (psd->package.count != 1) {
 567                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 568                 result = -EFAULT;
 569                 goto end;
 570         }
 571
 572         pdomain = &(pr->performance->domain_info);
 573
 574         state.length = sizeof(struct acpi_psd_package);
 575         state.pointer = pdomain;
 576
 577         status = acpi_extract_package(&(psd->package.elements[0]),
 578                 &format, &state);
 579         if (ACPI_FAILURE(status)) {
 580                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 581                 result = -EFAULT;
 582                 goto end;
 583         }
 584
 585         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 586                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 587                 result = -EFAULT;
 588                 goto end;
 589         }
 590
 591         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 592                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 593                 result = -EFAULT;
 594                 goto end;
 595         }
 596
 597         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 598             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 599             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 600                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 601                 result = -EFAULT;
 602                 goto end;
 603         }
 604 end:
 605         kfree(buffer.pointer);
 606         return result;
 607 }
 608
 609 int acpi_processor_preregister_performance(
 610                 struct acpi_processor_performance __percpu *performance)
 611 {
 612         int count_target;
 613         int retval = 0;
 614         unsigned int i, j;
 615         cpumask_var_t covered_cpus;
 616         struct acpi_processor *pr;
 617         struct acpi_psd_package *pdomain;
 618         struct acpi_processor *match_pr;
 619         struct acpi_psd_package *match_pdomain;
 620
 621         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 622                 return -ENOMEM;
 623
 624         mutex_lock(&performance_mutex);
 625
 626         /*
 627          * Check if another driver has already registered, and abort before
 628          * changing pr->performance if it has. Check input data as well.
 629          */
 630         for_each_possible_cpu(i) {
 631                 pr = per_cpu(processors, i);
 632                 if (!pr) {
 633                         /* Look only at processors in ACPI namespace */
 634                         continue;
 635                 }
 636
 637                 if (pr->performance) {
 638                         retval = -EBUSY;
 639                         goto err_out;
 640                 }
 641
 642                 if (!performance || !per_cpu_ptr(performance, i)) {
 643                         retval = -EINVAL;
 644                         goto err_out;
 645                 }
 646         }
 647
 648         /* Call _PSD for all CPUs */
 649         for_each_possible_cpu(i) {
 650                 pr = per_cpu(processors, i);
 651                 if (!pr)
 652                         continue;
 653
 654                 pr->performance = per_cpu_ptr(performance, i);
 655                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 656                 if (acpi_processor_get_psd(pr)) {
 657                         retval = -EINVAL;
 658                         continue;
 659                 }
 660         }
 661         if (retval)
 662                 goto err_ret;
 663
 664         /*
 665          * Now that we have _PSD data from all CPUs, lets setup P-state
 666          * domain info.
 667          */
 668         for_each_possible_cpu(i) {
 669                 pr = per_cpu(processors, i);
 670                 if (!pr)
 671                         continue;
 672
 673                 if (cpumask_test_cpu(i, covered_cpus))
 674                         continue;
 675
 676                 pdomain = &(pr->performance->domain_info);
 677                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 678                 cpumask_set_cpu(i, covered_cpus);
 679                 if (pdomain->num_processors <= 1)
 680                         continue;
 681
 682                 /* Validate the Domain info */
 683                 count_target = pdomain->num_processors;
 684                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 685                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 686                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 687                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 688                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 689                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 690
 691                 for_each_possible_cpu(j) {
 692                         if (i == j)
 693                                 continue;
 694
 695                         match_pr = per_cpu(processors, j);
 696                         if (!match_pr)
 697                                 continue;
 698
 699                         match_pdomain = &(match_pr->performance->domain_info);
 700                         if (match_pdomain->domain != pdomain->domain)
 701                                 continue;
 702
 703                         /* Here i and j are in the same domain */
 704
 705                         if (match_pdomain->num_processors != count_target) {
 706                                 retval = -EINVAL;
 707                                 goto err_ret;
 708                         }
 709
 710                         if (pdomain->coord_type != match_pdomain->coord_type) {
 711                                 retval = -EINVAL;
 712                                 goto err_ret;
 713                         }
 714
 715                         cpumask_set_cpu(j, covered_cpus);
 716                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 717                 }
 718
 719                 for_each_possible_cpu(j) {
 720                         if (i == j)
 721                                 continue;
 722
 723                         match_pr = per_cpu(processors, j);
 724                         if (!match_pr)
 725                                 continue;
 726
 727                         match_pdomain = &(match_pr->performance->domain_info);
 728                         if (match_pdomain->domain != pdomain->domain)
 729                                 continue;
 730
 731                         match_pr->performance->shared_type =
 732                                         pr->performance->shared_type;
 733                         cpumask_copy(match_pr->performance->shared_cpu_map,
 734                                      pr->performance->shared_cpu_map);
 735                 }
 736         }
 737
 738 err_ret:
 739         for_each_possible_cpu(i) {
 740                 pr = per_cpu(processors, i);
 741                 if (!pr || !pr->performance)
 742                         continue;
 743
 744                 /* Assume no coordination on any error parsing domain info */
 745                 if (retval) {
 746                         cpumask_clear(pr->performance->shared_cpu_map);
 747                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 748                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 749                 }
 750                 pr->performance = NULL; /* Will be set for real in register */
 751         }
 752
 753 err_out:
 754         mutex_unlock(&performance_mutex);
 755         free_cpumask_var(covered_cpus);
 756         return retval;
 757 }
 758 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 759
 760 int
 761 acpi_processor_register_performance(struct acpi_processor_performance
 762                                     *performance, unsigned int cpu)
 763 {
 764         struct acpi_processor *pr;
 765
 766         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 767                 return -EINVAL;
 768
 769         mutex_lock(&performance_mutex);
 770
 771         pr = per_cpu(processors, cpu);
 772         if (!pr) {
 773                 mutex_unlock(&performance_mutex);
 774                 return -ENODEV;
 775         }
 776
 777         if (pr->performance) {
 778                 mutex_unlock(&performance_mutex);
 779                 return -EBUSY;
 780         }
 781
 782         WARN_ON(!performance);
 783
 784         pr->performance = performance;
 785
 786         if (acpi_processor_get_performance_info(pr)) {
 787                 pr->performance = NULL;
 788                 mutex_unlock(&performance_mutex);
 789                 return -EIO;
 790         }
 791
 792         mutex_unlock(&performance_mutex);
 793         return 0;
 794 }
 795
 796 EXPORT_SYMBOL(acpi_processor_register_performance);
 797
 798 void
 799 acpi_processor_unregister_performance(struct acpi_processor_performance
 800                                       *performance, unsigned int cpu)
 801 {
 802         struct acpi_processor *pr;
 803
 804         mutex_lock(&performance_mutex);
 805
 806         pr = per_cpu(processors, cpu);
 807         if (!pr) {
 808                 mutex_unlock(&performance_mutex);
 809                 return;
 810         }
 811
 812         if (pr->performance)
 813                 kfree(pr->performance->states);
 814         pr->performance = NULL;
 815
 816         mutex_unlock(&performance_mutex);
 817
 818         return;
 819 }
 820
 821 EXPORT_SYMBOL(acpi_processor_unregister_performance);