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         acpi_handle temp;
 168
 169         params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 170         params[1].integer.value =  status;
 171
 172         /* when there is no _OST , skip it */
 173         if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
 174                 return;
 175
 176         acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 177         return;
 178 }
 179
 180 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 181 {
 182         int ret;
 183
 184         if (ignore_ppc) {
 185                 /*
 186                  * Only when it is notification event, the _OST object
 187                  * will be evaluated. Otherwise it is skipped.
 188                  */
 189                 if (event_flag)
 190                         acpi_processor_ppc_ost(pr->handle, 1);
 191                 return 0;
 192         }
 193
 194         ret = acpi_processor_get_platform_limit(pr);
 195         /*
 196          * Only when it is notification event, the _OST object
 197          * will be evaluated. Otherwise it is skipped.
 198          */
 199         if (event_flag) {
 200                 if (ret < 0)
 201                         acpi_processor_ppc_ost(pr->handle, 1);
 202                 else
 203                         acpi_processor_ppc_ost(pr->handle, 0);
 204         }
 205         if (ret < 0)
 206                 return (ret);
 207         else
 208                 return cpufreq_update_policy(pr->id);
 209 }
 210
 211 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 212 {
 213         struct acpi_processor *pr;
 214
 215         pr = per_cpu(processors, cpu);
 216         if (!pr || !pr->performance || !pr->performance->state_count)
 217                 return -ENODEV;
 218         *limit = pr->performance->states[pr->performance_platform_limit].
 219                 core_frequency * 1000;
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 223
 224 void acpi_processor_ppc_init(void)
 225 {
 226         if (!cpufreq_register_notifier
 227             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 228                 acpi_processor_ppc_status |= PPC_REGISTERED;
 229         else
 230                 printk(KERN_DEBUG
 231                        "Warning: Processor Platform Limit not supported.\n");
 232 }
 233
 234 void acpi_processor_ppc_exit(void)
 235 {
 236         if (acpi_processor_ppc_status & PPC_REGISTERED)
 237                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 238                                             CPUFREQ_POLICY_NOTIFIER);
 239
 240         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 241 }
 242
 243 /*
 244  * Do a quick check if the systems looks like it should use ACPI
 245  * cpufreq. We look at a _PCT method being available, but don't
 246  * do a whole lot of sanity checks.
 247  */
 248 void acpi_processor_load_module(struct acpi_processor *pr)
 249 {
 250         static int requested;
 251         acpi_status status = 0;
 252         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 253
 254         if (!arch_has_acpi_pdc() || requested)
 255                 return;
 256         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 257         if (!ACPI_FAILURE(status)) {
 258                 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
 259                 request_module_nowait("acpi_cpufreq");
 260                 requested = 1;
 261         }
 262         kfree(buffer.pointer);
 263 }
 264
 265 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 266 {
 267         int result = 0;
 268         acpi_status status = 0;
 269         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 270         union acpi_object *pct = NULL;
 271         union acpi_object obj = { 0 };
 272
 273
 274         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 275         if (ACPI_FAILURE(status)) {
 276                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 277                 return -ENODEV;
 278         }
 279
 280         pct = (union acpi_object *)buffer.pointer;
 281         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 282             || (pct->package.count != 2)) {
 283                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 284                 result = -EFAULT;
 285                 goto end;
 286         }
 287
 288         /*
 289          * control_register
 290          */
 291
 292         obj = pct->package.elements[0];
 293
 294         if ((obj.type != ACPI_TYPE_BUFFER)
 295             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 296             || (obj.buffer.pointer == NULL)) {
 297                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 298                 result = -EFAULT;
 299                 goto end;
 300         }
 301         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 302                sizeof(struct acpi_pct_register));
 303
 304         /*
 305          * status_register
 306          */
 307
 308         obj = pct->package.elements[1];
 309
 310         if ((obj.type != ACPI_TYPE_BUFFER)
 311             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 312             || (obj.buffer.pointer == NULL)) {
 313                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 314                 result = -EFAULT;
 315                 goto end;
 316         }
 317
 318         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 319                sizeof(struct acpi_pct_register));
 320
 321       end:
 322         kfree(buffer.pointer);
 323
 324         return result;
 325 }
 326
 327 #ifdef CONFIG_X86
 328 /*
 329  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 330  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 331  */
 332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 333 {
 334         u32 hi, lo, fid, did;
 335         int index = px->control & 0x00000007;
 336
 337         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 338                 return;
 339
 340         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 341             || boot_cpu_data.x86 == 0x11) {
 342                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 343                 fid = lo & 0x3f;
 344                 did = (lo >> 6) & 7;
 345                 if (boot_cpu_data.x86 == 0x10)
 346                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 347                 else
 348                         px->core_frequency = (100 * (fid + 8)) >> did;
 349         }
 350 }
 351 #else
 352 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 353 #endif
 354
 355 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 356 {
 357         int result = 0;
 358         acpi_status status = AE_OK;
 359         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 360         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 361         struct acpi_buffer state = { 0, NULL };
 362         union acpi_object *pss = NULL;
 363         int i;
 364         int last_invalid = -1;
 365
 366
 367         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 368         if (ACPI_FAILURE(status)) {
 369                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 370                 return -ENODEV;
 371         }
 372
 373         pss = buffer.pointer;
 374         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 375                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 376                 result = -EFAULT;
 377                 goto end;
 378         }
 379
 380         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 381                           pss->package.count));
 382
 383         pr->performance->state_count = pss->package.count;
 384         pr->performance->states =
 385             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 386                     GFP_KERNEL);
 387         if (!pr->performance->states) {
 388                 result = -ENOMEM;
 389                 goto end;
 390         }
 391
 392         for (i = 0; i < pr->performance->state_count; i++) {
 393
 394                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 395
 396                 state.length = sizeof(struct acpi_processor_px);
 397                 state.pointer = px;
 398
 399                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 400
 401                 status = acpi_extract_package(&(pss->package.elements[i]),
 402                                               &format, &state);
 403                 if (ACPI_FAILURE(status)) {
 404                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 405                         result = -EFAULT;
 406                         kfree(pr->performance->states);
 407                         goto end;
 408                 }
 409
 410                 amd_fixup_frequency(px, i);
 411
 412                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 413                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 414                                   i,
 415                                   (u32) px->core_frequency,
 416                                   (u32) px->power,
 417                                   (u32) px->transition_latency,
 418                                   (u32) px->bus_master_latency,
 419                                   (u32) px->control, (u32) px->status));
 420
 421                 /*
 422                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 423                  */
 424                 if (!px->core_frequency ||
 425                     ((u32)(px->core_frequency * 1000) !=
 426                      (px->core_frequency * 1000))) {
 427                         printk(KERN_ERR FW_BUG PREFIX
 428                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 429                                pr->id, px->core_frequency);
 430                         if (last_invalid == -1)
 431                                 last_invalid = i;
 432                 } else {
 433                         if (last_invalid != -1) {
 434                                 /*
 435                                  * Copy this valid entry over last_invalid entry
 436                                  */
 437                                 memcpy(&(pr->performance->states[last_invalid]),
 438                                        px, sizeof(struct acpi_processor_px));
 439                                 ++last_invalid;
 440                         }
 441                 }
 442         }
 443
 444         if (last_invalid == 0) {
 445                 printk(KERN_ERR FW_BUG PREFIX
 446                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 447                 result = -EFAULT;
 448                 kfree(pr->performance->states);
 449                 pr->performance->states = NULL;
 450         }
 451
 452         if (last_invalid > 0)
 453                 pr->performance->state_count = last_invalid;
 454
 455       end:
 456         kfree(buffer.pointer);
 457
 458         return result;
 459 }
 460
 461 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 462 {
 463         int result = 0;
 464         acpi_status status = AE_OK;
 465         acpi_handle handle = NULL;
 466
 467         if (!pr || !pr->performance || !pr->handle)
 468                 return -EINVAL;
 469
 470         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 471         if (ACPI_FAILURE(status)) {
 472                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 473                                   "ACPI-based processor performance control unavailable\n"));
 474                 return -ENODEV;
 475         }
 476
 477         result = acpi_processor_get_performance_control(pr);
 478         if (result)
 479                 goto update_bios;
 480
 481         result = acpi_processor_get_performance_states(pr);
 482         if (result)
 483                 goto update_bios;
 484
 485         /* We need to call _PPC once when cpufreq starts */
 486         if (ignore_ppc != 1)
 487                 result = acpi_processor_get_platform_limit(pr);
 488
 489         return result;
 490
 491         /*
 492          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 493          * the BIOS is older than the CPU and does not know its frequencies
 494          */
 495  update_bios:
 496 #ifdef CONFIG_X86
 497         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 498                 if(boot_cpu_has(X86_FEATURE_EST))
 499                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 500                                "frequency support\n");
 501         }
 502 #endif
 503         return result;
 504 }
 505
 506 int acpi_processor_notify_smm(struct module *calling_module)
 507 {
 508         acpi_status status;
 509         static int is_done = 0;
 510
 511
 512         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 513                 return -EBUSY;
 514
 515         if (!try_module_get(calling_module))
 516                 return -EINVAL;
 517
 518         /* is_done is set to negative if an error occurred,
 519          * and to postitive if _no_ error occurred, but SMM
 520          * was already notified. This avoids double notification
 521          * which might lead to unexpected results...
 522          */
 523         if (is_done > 0) {
 524                 module_put(calling_module);
 525                 return 0;
 526         } else if (is_done < 0) {
 527                 module_put(calling_module);
 528                 return is_done;
 529         }
 530
 531         is_done = -EIO;
 532
 533         /* Can't write pstate_control to smi_command if either value is zero */
 534         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 536                 module_put(calling_module);
 537                 return 0;
 538         }
 539
 540         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 541                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 542                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 543
 544         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 545                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 546         if (ACPI_FAILURE(status)) {
 547                 ACPI_EXCEPTION((AE_INFO, status,
 548                                 "Failed to write pstate_control [0x%x] to "
 549                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 550                                 acpi_gbl_FADT.smi_command));
 551                 module_put(calling_module);
 552                 return status;
 553         }
 554
 555         /* Success. If there's no _PPC, we need to fear nothing, so
 556          * we can allow the cpufreq driver to be rmmod'ed. */
 557         is_done = 1;
 558
 559         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 560                 module_put(calling_module);
 561
 562         return 0;
 563 }
 564
 565 EXPORT_SYMBOL(acpi_processor_notify_smm);
 566
 567 static int acpi_processor_get_psd(struct acpi_processor *pr)
 568 {
 569         int result = 0;
 570         acpi_status status = AE_OK;
 571         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 572         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 573         struct acpi_buffer state = {0, NULL};
 574         union acpi_object  *psd = NULL;
 575         struct acpi_psd_package *pdomain;
 576
 577         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 578         if (ACPI_FAILURE(status)) {
 579                 return -ENODEV;
 580         }
 581
 582         psd = buffer.pointer;
 583         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 584                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 585                 result = -EFAULT;
 586                 goto end;
 587         }
 588
 589         if (psd->package.count != 1) {
 590                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 591                 result = -EFAULT;
 592                 goto end;
 593         }
 594
 595         pdomain = &(pr->performance->domain_info);
 596
 597         state.length = sizeof(struct acpi_psd_package);
 598         state.pointer = pdomain;
 599
 600         status = acpi_extract_package(&(psd->package.elements[0]),
 601                 &format, &state);
 602         if (ACPI_FAILURE(status)) {
 603                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 604                 result = -EFAULT;
 605                 goto end;
 606         }
 607
 608         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 609                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 610                 result = -EFAULT;
 611                 goto end;
 612         }
 613
 614         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 615                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 616                 result = -EFAULT;
 617                 goto end;
 618         }
 619
 620         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 621             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 622             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 623                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 624                 result = -EFAULT;
 625                 goto end;
 626         }
 627 end:
 628         kfree(buffer.pointer);
 629         return result;
 630 }
 631
 632 int acpi_processor_preregister_performance(
 633                 struct acpi_processor_performance __percpu *performance)
 634 {
 635         int count, count_target;
 636         int retval = 0;
 637         unsigned int i, j;
 638         cpumask_var_t covered_cpus;
 639         struct acpi_processor *pr;
 640         struct acpi_psd_package *pdomain;
 641         struct acpi_processor *match_pr;
 642         struct acpi_psd_package *match_pdomain;
 643
 644         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 645                 return -ENOMEM;
 646
 647         mutex_lock(&performance_mutex);
 648
 649         /*
 650          * Check if another driver has already registered, and abort before
 651          * changing pr->performance if it has. Check input data as well.
 652          */
 653         for_each_possible_cpu(i) {
 654                 pr = per_cpu(processors, i);
 655                 if (!pr) {
 656                         /* Look only at processors in ACPI namespace */
 657                         continue;
 658                 }
 659
 660                 if (pr->performance) {
 661                         retval = -EBUSY;
 662                         goto err_out;
 663                 }
 664
 665                 if (!performance || !per_cpu_ptr(performance, i)) {
 666                         retval = -EINVAL;
 667                         goto err_out;
 668                 }
 669         }
 670
 671         /* Call _PSD for all CPUs */
 672         for_each_possible_cpu(i) {
 673                 pr = per_cpu(processors, i);
 674                 if (!pr)
 675                         continue;
 676
 677                 pr->performance = per_cpu_ptr(performance, i);
 678                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 679                 if (acpi_processor_get_psd(pr)) {
 680                         retval = -EINVAL;
 681                         continue;
 682                 }
 683         }
 684         if (retval)
 685                 goto err_ret;
 686
 687         /*
 688          * Now that we have _PSD data from all CPUs, lets setup P-state
 689          * domain info.
 690          */
 691         for_each_possible_cpu(i) {
 692                 pr = per_cpu(processors, i);
 693                 if (!pr)
 694                         continue;
 695
 696                 if (cpumask_test_cpu(i, covered_cpus))
 697                         continue;
 698
 699                 pdomain = &(pr->performance->domain_info);
 700                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 701                 cpumask_set_cpu(i, covered_cpus);
 702                 if (pdomain->num_processors <= 1)
 703                         continue;
 704
 705                 /* Validate the Domain info */
 706                 count_target = pdomain->num_processors;
 707                 count = 1;
 708                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 709                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 710                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 711                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 712                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 713                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 714
 715                 for_each_possible_cpu(j) {
 716                         if (i == j)
 717                                 continue;
 718
 719                         match_pr = per_cpu(processors, j);
 720                         if (!match_pr)
 721                                 continue;
 722
 723                         match_pdomain = &(match_pr->performance->domain_info);
 724                         if (match_pdomain->domain != pdomain->domain)
 725                                 continue;
 726
 727                         /* Here i and j are in the same domain */
 728
 729                         if (match_pdomain->num_processors != count_target) {
 730                                 retval = -EINVAL;
 731                                 goto err_ret;
 732                         }
 733
 734                         if (pdomain->coord_type != match_pdomain->coord_type) {
 735                                 retval = -EINVAL;
 736                                 goto err_ret;
 737                         }
 738
 739                         cpumask_set_cpu(j, covered_cpus);
 740                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 741                         count++;
 742                 }
 743
 744                 for_each_possible_cpu(j) {
 745                         if (i == j)
 746                                 continue;
 747
 748                         match_pr = per_cpu(processors, j);
 749                         if (!match_pr)
 750                                 continue;
 751
 752                         match_pdomain = &(match_pr->performance->domain_info);
 753                         if (match_pdomain->domain != pdomain->domain)
 754                                 continue;
 755
 756                         match_pr->performance->shared_type =
 757                                         pr->performance->shared_type;
 758                         cpumask_copy(match_pr->performance->shared_cpu_map,
 759                                      pr->performance->shared_cpu_map);
 760                 }
 761         }
 762
 763 err_ret:
 764         for_each_possible_cpu(i) {
 765                 pr = per_cpu(processors, i);
 766                 if (!pr || !pr->performance)
 767                         continue;
 768
 769                 /* Assume no coordination on any error parsing domain info */
 770                 if (retval) {
 771                         cpumask_clear(pr->performance->shared_cpu_map);
 772                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 773                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 774                 }
 775                 pr->performance = NULL; /* Will be set for real in register */
 776         }
 777
 778 err_out:
 779         mutex_unlock(&performance_mutex);
 780         free_cpumask_var(covered_cpus);
 781         return retval;
 782 }
 783 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 784
 785 int
 786 acpi_processor_register_performance(struct acpi_processor_performance
 787                                     *performance, unsigned int cpu)
 788 {
 789         struct acpi_processor *pr;
 790
 791         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 792                 return -EINVAL;
 793
 794         mutex_lock(&performance_mutex);
 795
 796         pr = per_cpu(processors, cpu);
 797         if (!pr) {
 798                 mutex_unlock(&performance_mutex);
 799                 return -ENODEV;
 800         }
 801
 802         if (pr->performance) {
 803                 mutex_unlock(&performance_mutex);
 804                 return -EBUSY;
 805         }
 806
 807         WARN_ON(!performance);
 808
 809         pr->performance = performance;
 810
 811         if (acpi_processor_get_performance_info(pr)) {
 812                 pr->performance = NULL;
 813                 mutex_unlock(&performance_mutex);
 814                 return -EIO;
 815         }
 816
 817         mutex_unlock(&performance_mutex);
 818         return 0;
 819 }
 820
 821 EXPORT_SYMBOL(acpi_processor_register_performance);
 822
 823 void
 824 acpi_processor_unregister_performance(struct acpi_processor_performance
 825                                       *performance, unsigned int cpu)
 826 {
 827         struct acpi_processor *pr;
 828
 829         mutex_lock(&performance_mutex);
 830
 831         pr = per_cpu(processors, cpu);
 832         if (!pr) {
 833                 mutex_unlock(&performance_mutex);
 834                 return;
 835         }
 836
 837         if (pr->performance)
 838                 kfree(pr->performance->states);
 839         pr->performance = NULL;
 840
 841         mutex_unlock(&performance_mutex);
 842
 843         return;
 844 }
 845
 846 EXPORT_SYMBOL(acpi_processor_unregister_performance);