linux/drivers/acpi/processor_perflib.c
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   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
  48ACPI_MODULE_NAME("processor_perflib");
  49
  50static 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 */
  68static int ignore_ppc = -1;
  69module_param(ignore_ppc, int, 0644);
  70MODULE_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
  76static int acpi_processor_ppc_status;
  77
  78static 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
 117static struct notifier_block acpi_ppc_notifier_block = {
 118        .notifier_call = acpi_processor_ppc_notifier,
 119};
 120
 121static 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 */
 160static 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
 180int 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
 211int 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}
 222EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 223
 224void 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
 234void 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 */
 248void 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
 265static 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
 327static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 328{
 329        int result = 0;
 330        acpi_status status = AE_OK;
 331        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 332        struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 333        struct acpi_buffer state = { 0, NULL };
 334        union acpi_object *pss = NULL;
 335        int i;
 336        int last_invalid = -1;
 337
 338
 339        status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 340        if (ACPI_FAILURE(status)) {
 341                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 342                return -ENODEV;
 343        }
 344
 345        pss = buffer.pointer;
 346        if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 347                printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 348                result = -EFAULT;
 349                goto end;
 350        }
 351
 352        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 353                          pss->package.count));
 354
 355        pr->performance->state_count = pss->package.count;
 356        pr->performance->states =
 357            kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 358                    GFP_KERNEL);
 359        if (!pr->performance->states) {
 360                result = -ENOMEM;
 361                goto end;
 362        }
 363
 364        for (i = 0; i < pr->performance->state_count; i++) {
 365
 366                struct acpi_processor_px *px = &(pr->performance->states[i]);
 367
 368                state.length = sizeof(struct acpi_processor_px);
 369                state.pointer = px;
 370
 371                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 372
 373                status = acpi_extract_package(&(pss->package.elements[i]),
 374                                              &format, &state);
 375                if (ACPI_FAILURE(status)) {
 376                        ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 377                        result = -EFAULT;
 378                        kfree(pr->performance->states);
 379                        goto end;
 380                }
 381
 382                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 383                                  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 384                                  i,
 385                                  (u32) px->core_frequency,
 386                                  (u32) px->power,
 387                                  (u32) px->transition_latency,
 388                                  (u32) px->bus_master_latency,
 389                                  (u32) px->control, (u32) px->status));
 390
 391                /*
 392                 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 393                 */
 394                if (!px->core_frequency ||
 395                    ((u32)(px->core_frequency * 1000) !=
 396                     (px->core_frequency * 1000))) {
 397                        printk(KERN_ERR FW_BUG PREFIX
 398                               "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 399                               pr->id, px->core_frequency);
 400                        if (last_invalid == -1)
 401                                last_invalid = i;
 402                } else {
 403                        if (last_invalid != -1) {
 404                                /*
 405                                 * Copy this valid entry over last_invalid entry
 406                                 */
 407                                memcpy(&(pr->performance->states[last_invalid]),
 408                                       px, sizeof(struct acpi_processor_px));
 409                                ++last_invalid;
 410                        }
 411                }
 412        }
 413
 414        if (last_invalid == 0) {
 415                printk(KERN_ERR FW_BUG PREFIX
 416                       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 417                result = -EFAULT;
 418                kfree(pr->performance->states);
 419                pr->performance->states = NULL;
 420        }
 421
 422        if (last_invalid > 0)
 423                pr->performance->state_count = last_invalid;
 424
 425      end:
 426        kfree(buffer.pointer);
 427
 428        return result;
 429}
 430
 431static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 432{
 433        int result = 0;
 434        acpi_status status = AE_OK;
 435        acpi_handle handle = NULL;
 436
 437        if (!pr || !pr->performance || !pr->handle)
 438                return -EINVAL;
 439
 440        status = acpi_get_handle(pr->handle, "_PCT", &handle);
 441        if (ACPI_FAILURE(status)) {
 442                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 443                                  "ACPI-based processor performance control unavailable\n"));
 444                return -ENODEV;
 445        }
 446
 447        result = acpi_processor_get_performance_control(pr);
 448        if (result)
 449                goto update_bios;
 450
 451        result = acpi_processor_get_performance_states(pr);
 452        if (result)
 453                goto update_bios;
 454
 455        /* We need to call _PPC once when cpufreq starts */
 456        if (ignore_ppc != 1)
 457                result = acpi_processor_get_platform_limit(pr);
 458
 459        return result;
 460
 461        /*
 462         * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 463         * the BIOS is older than the CPU and does not know its frequencies
 464         */
 465 update_bios:
 466#ifdef CONFIG_X86
 467        if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 468                if(boot_cpu_has(X86_FEATURE_EST))
 469                        printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 470                               "frequency support\n");
 471        }
 472#endif
 473        return result;
 474}
 475
 476int acpi_processor_notify_smm(struct module *calling_module)
 477{
 478        acpi_status status;
 479        static int is_done = 0;
 480
 481
 482        if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 483                return -EBUSY;
 484
 485        if (!try_module_get(calling_module))
 486                return -EINVAL;
 487
 488        /* is_done is set to negative if an error occurred,
 489         * and to postitive if _no_ error occurred, but SMM
 490         * was already notified. This avoids double notification
 491         * which might lead to unexpected results...
 492         */
 493        if (is_done > 0) {
 494                module_put(calling_module);
 495                return 0;
 496        } else if (is_done < 0) {
 497                module_put(calling_module);
 498                return is_done;
 499        }
 500
 501        is_done = -EIO;
 502
 503        /* Can't write pstate_control to smi_command if either value is zero */
 504        if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 505                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 506                module_put(calling_module);
 507                return 0;
 508        }
 509
 510        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 511                          "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 512                          acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 513
 514        status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 515                                    (u32) acpi_gbl_FADT.pstate_control, 8);
 516        if (ACPI_FAILURE(status)) {
 517                ACPI_EXCEPTION((AE_INFO, status,
 518                                "Failed to write pstate_control [0x%x] to "
 519                                "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 520                                acpi_gbl_FADT.smi_command));
 521                module_put(calling_module);
 522                return status;
 523        }
 524
 525        /* Success. If there's no _PPC, we need to fear nothing, so
 526         * we can allow the cpufreq driver to be rmmod'ed. */
 527        is_done = 1;
 528
 529        if (!(acpi_processor_ppc_status & PPC_IN_USE))
 530                module_put(calling_module);
 531
 532        return 0;
 533}
 534
 535EXPORT_SYMBOL(acpi_processor_notify_smm);
 536
 537static int acpi_processor_get_psd(struct acpi_processor *pr)
 538{
 539        int result = 0;
 540        acpi_status status = AE_OK;
 541        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 542        struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 543        struct acpi_buffer state = {0, NULL};
 544        union acpi_object  *psd = NULL;
 545        struct acpi_psd_package *pdomain;
 546
 547        status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 548        if (ACPI_FAILURE(status)) {
 549                return -ENODEV;
 550        }
 551
 552        psd = buffer.pointer;
 553        if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 554                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 555                result = -EFAULT;
 556                goto end;
 557        }
 558
 559        if (psd->package.count != 1) {
 560                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 561                result = -EFAULT;
 562                goto end;
 563        }
 564
 565        pdomain = &(pr->performance->domain_info);
 566
 567        state.length = sizeof(struct acpi_psd_package);
 568        state.pointer = pdomain;
 569
 570        status = acpi_extract_package(&(psd->package.elements[0]),
 571                &format, &state);
 572        if (ACPI_FAILURE(status)) {
 573                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 574                result = -EFAULT;
 575                goto end;
 576        }
 577
 578        if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 579                printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 580                result = -EFAULT;
 581                goto end;
 582        }
 583
 584        if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 585                printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 586                result = -EFAULT;
 587                goto end;
 588        }
 589
 590        if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 591            pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 592            pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 593                printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 594                result = -EFAULT;
 595                goto end;
 596        }
 597end:
 598        kfree(buffer.pointer);
 599        return result;
 600}
 601
 602int acpi_processor_preregister_performance(
 603                struct acpi_processor_performance __percpu *performance)
 604{
 605        int count, count_target;
 606        int retval = 0;
 607        unsigned int i, j;
 608        cpumask_var_t covered_cpus;
 609        struct acpi_processor *pr;
 610        struct acpi_psd_package *pdomain;
 611        struct acpi_processor *match_pr;
 612        struct acpi_psd_package *match_pdomain;
 613
 614        if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 615                return -ENOMEM;
 616
 617        mutex_lock(&performance_mutex);
 618
 619        /*
 620         * Check if another driver has already registered, and abort before
 621         * changing pr->performance if it has. Check input data as well.
 622         */
 623        for_each_possible_cpu(i) {
 624                pr = per_cpu(processors, i);
 625                if (!pr) {
 626                        /* Look only at processors in ACPI namespace */
 627                        continue;
 628                }
 629
 630                if (pr->performance) {
 631                        retval = -EBUSY;
 632                        goto err_out;
 633                }
 634
 635                if (!performance || !per_cpu_ptr(performance, i)) {
 636                        retval = -EINVAL;
 637                        goto err_out;
 638                }
 639        }
 640
 641        /* Call _PSD for all CPUs */
 642        for_each_possible_cpu(i) {
 643                pr = per_cpu(processors, i);
 644                if (!pr)
 645                        continue;
 646
 647                pr->performance = per_cpu_ptr(performance, i);
 648                cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 649                if (acpi_processor_get_psd(pr)) {
 650                        retval = -EINVAL;
 651                        continue;
 652                }
 653        }
 654        if (retval)
 655                goto err_ret;
 656
 657        /*
 658         * Now that we have _PSD data from all CPUs, lets setup P-state 
 659         * domain info.
 660         */
 661        for_each_possible_cpu(i) {
 662                pr = per_cpu(processors, i);
 663                if (!pr)
 664                        continue;
 665
 666                if (cpumask_test_cpu(i, covered_cpus))
 667                        continue;
 668
 669                pdomain = &(pr->performance->domain_info);
 670                cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 671                cpumask_set_cpu(i, covered_cpus);
 672                if (pdomain->num_processors <= 1)
 673                        continue;
 674
 675                /* Validate the Domain info */
 676                count_target = pdomain->num_processors;
 677                count = 1;
 678                if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 679                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 680                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 681                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 682                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 683                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 684
 685                for_each_possible_cpu(j) {
 686                        if (i == j)
 687                                continue;
 688
 689                        match_pr = per_cpu(processors, j);
 690                        if (!match_pr)
 691                                continue;
 692
 693                        match_pdomain = &(match_pr->performance->domain_info);
 694                        if (match_pdomain->domain != pdomain->domain)
 695                                continue;
 696
 697                        /* Here i and j are in the same domain */
 698
 699                        if (match_pdomain->num_processors != count_target) {
 700                                retval = -EINVAL;
 701                                goto err_ret;
 702                        }
 703
 704                        if (pdomain->coord_type != match_pdomain->coord_type) {
 705                                retval = -EINVAL;
 706                                goto err_ret;
 707                        }
 708
 709                        cpumask_set_cpu(j, covered_cpus);
 710                        cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 711                        count++;
 712                }
 713
 714                for_each_possible_cpu(j) {
 715                        if (i == j)
 716                                continue;
 717
 718                        match_pr = per_cpu(processors, j);
 719                        if (!match_pr)
 720                                continue;
 721
 722                        match_pdomain = &(match_pr->performance->domain_info);
 723                        if (match_pdomain->domain != pdomain->domain)
 724                                continue;
 725
 726                        match_pr->performance->shared_type = 
 727                                        pr->performance->shared_type;
 728                        cpumask_copy(match_pr->performance->shared_cpu_map,
 729                                     pr->performance->shared_cpu_map);
 730                }
 731        }
 732
 733err_ret:
 734        for_each_possible_cpu(i) {
 735                pr = per_cpu(processors, i);
 736                if (!pr || !pr->performance)
 737                        continue;
 738
 739                /* Assume no coordination on any error parsing domain info */
 740                if (retval) {
 741                        cpumask_clear(pr->performance->shared_cpu_map);
 742                        cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 743                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 744                }
 745                pr->performance = NULL; /* Will be set for real in register */
 746        }
 747
 748err_out:
 749        mutex_unlock(&performance_mutex);
 750        free_cpumask_var(covered_cpus);
 751        return retval;
 752}
 753EXPORT_SYMBOL(acpi_processor_preregister_performance);
 754
 755int
 756acpi_processor_register_performance(struct acpi_processor_performance
 757                                    *performance, unsigned int cpu)
 758{
 759        struct acpi_processor *pr;
 760
 761        if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 762                return -EINVAL;
 763
 764        mutex_lock(&performance_mutex);
 765
 766        pr = per_cpu(processors, cpu);
 767        if (!pr) {
 768                mutex_unlock(&performance_mutex);
 769                return -ENODEV;
 770        }
 771
 772        if (pr->performance) {
 773                mutex_unlock(&performance_mutex);
 774                return -EBUSY;
 775        }
 776
 777        WARN_ON(!performance);
 778
 779        pr->performance = performance;
 780
 781        if (acpi_processor_get_performance_info(pr)) {
 782                pr->performance = NULL;
 783                mutex_unlock(&performance_mutex);
 784                return -EIO;
 785        }
 786
 787        mutex_unlock(&performance_mutex);
 788        return 0;
 789}
 790
 791EXPORT_SYMBOL(acpi_processor_register_performance);
 792
 793void
 794acpi_processor_unregister_performance(struct acpi_processor_performance
 795                                      *performance, unsigned int cpu)
 796{
 797        struct acpi_processor *pr;
 798
 799        mutex_lock(&performance_mutex);
 800
 801        pr = per_cpu(processors, cpu);
 802        if (!pr) {
 803                mutex_unlock(&performance_mutex);
 804                return;
 805        }
 806
 807        if (pr->performance)
 808                kfree(pr->performance->states);
 809        pr->performance = NULL;
 810
 811        mutex_unlock(&performance_mutex);
 812
 813        return;
 814}
 815
 816EXPORT_SYMBOL(acpi_processor_unregister_performance);
 817
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