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
 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 */
 332static 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                /*
 344                 * MSR C001_0064+:
 345                 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 346                 */
 347                if (!(hi & BIT(31)))
 348                        return;
 349
 350                fid = lo & 0x3f;
 351                did = (lo >> 6) & 7;
 352                if (boot_cpu_data.x86 == 0x10)
 353                        px->core_frequency = (100 * (fid + 0x10)) >> did;
 354                else
 355                        px->core_frequency = (100 * (fid + 8)) >> did;
 356        }
 357}
 358#else
 359static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 360#endif
 361
 362static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 363{
 364        int result = 0;
 365        acpi_status status = AE_OK;
 366        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 367        struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 368        struct acpi_buffer state = { 0, NULL };
 369        union acpi_object *pss = NULL;
 370        int i;
 371        int last_invalid = -1;
 372
 373
 374        status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 375        if (ACPI_FAILURE(status)) {
 376                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 377                return -ENODEV;
 378        }
 379
 380        pss = buffer.pointer;
 381        if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 382                printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 383                result = -EFAULT;
 384                goto end;
 385        }
 386
 387        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 388                          pss->package.count));
 389
 390        pr->performance->state_count = pss->package.count;
 391        pr->performance->states =
 392            kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 393                    GFP_KERNEL);
 394        if (!pr->performance->states) {
 395                result = -ENOMEM;
 396                goto end;
 397        }
 398
 399        for (i = 0; i < pr->performance->state_count; i++) {
 400
 401                struct acpi_processor_px *px = &(pr->performance->states[i]);
 402
 403                state.length = sizeof(struct acpi_processor_px);
 404                state.pointer = px;
 405
 406                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 407
 408                status = acpi_extract_package(&(pss->package.elements[i]),
 409                                              &format, &state);
 410                if (ACPI_FAILURE(status)) {
 411                        ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 412                        result = -EFAULT;
 413                        kfree(pr->performance->states);
 414                        goto end;
 415                }
 416
 417                amd_fixup_frequency(px, i);
 418
 419                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 420                                  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 421                                  i,
 422                                  (u32) px->core_frequency,
 423                                  (u32) px->power,
 424                                  (u32) px->transition_latency,
 425                                  (u32) px->bus_master_latency,
 426                                  (u32) px->control, (u32) px->status));
 427
 428                /*
 429                 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 430                 */
 431                if (!px->core_frequency ||
 432                    ((u32)(px->core_frequency * 1000) !=
 433                     (px->core_frequency * 1000))) {
 434                        printk(KERN_ERR FW_BUG PREFIX
 435                               "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 436                               pr->id, px->core_frequency);
 437                        if (last_invalid == -1)
 438                                last_invalid = i;
 439                } else {
 440                        if (last_invalid != -1) {
 441                                /*
 442                                 * Copy this valid entry over last_invalid entry
 443                                 */
 444                                memcpy(&(pr->performance->states[last_invalid]),
 445                                       px, sizeof(struct acpi_processor_px));
 446                                ++last_invalid;
 447                        }
 448                }
 449        }
 450
 451        if (last_invalid == 0) {
 452                printk(KERN_ERR FW_BUG PREFIX
 453                       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 454                result = -EFAULT;
 455                kfree(pr->performance->states);
 456                pr->performance->states = NULL;
 457        }
 458
 459        if (last_invalid > 0)
 460                pr->performance->state_count = last_invalid;
 461
 462      end:
 463        kfree(buffer.pointer);
 464
 465        return result;
 466}
 467
 468int acpi_processor_get_performance_info(struct acpi_processor *pr)
 469{
 470        int result = 0;
 471        acpi_status status = AE_OK;
 472        acpi_handle handle = NULL;
 473
 474        if (!pr || !pr->performance || !pr->handle)
 475                return -EINVAL;
 476
 477        status = acpi_get_handle(pr->handle, "_PCT", &handle);
 478        if (ACPI_FAILURE(status)) {
 479                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 480                                  "ACPI-based processor performance control unavailable\n"));
 481                return -ENODEV;
 482        }
 483
 484        result = acpi_processor_get_performance_control(pr);
 485        if (result)
 486                goto update_bios;
 487
 488        result = acpi_processor_get_performance_states(pr);
 489        if (result)
 490                goto update_bios;
 491
 492        /* We need to call _PPC once when cpufreq starts */
 493        if (ignore_ppc != 1)
 494                result = acpi_processor_get_platform_limit(pr);
 495
 496        return result;
 497
 498        /*
 499         * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 500         * the BIOS is older than the CPU and does not know its frequencies
 501         */
 502 update_bios:
 503#ifdef CONFIG_X86
 504        if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 505                if(boot_cpu_has(X86_FEATURE_EST))
 506                        printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 507                               "frequency support\n");
 508        }
 509#endif
 510        return result;
 511}
 512EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 513int acpi_processor_notify_smm(struct module *calling_module)
 514{
 515        acpi_status status;
 516        static int is_done = 0;
 517
 518
 519        if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 520                return -EBUSY;
 521
 522        if (!try_module_get(calling_module))
 523                return -EINVAL;
 524
 525        /* is_done is set to negative if an error occurred,
 526         * and to postitive if _no_ error occurred, but SMM
 527         * was already notified. This avoids double notification
 528         * which might lead to unexpected results...
 529         */
 530        if (is_done > 0) {
 531                module_put(calling_module);
 532                return 0;
 533        } else if (is_done < 0) {
 534                module_put(calling_module);
 535                return is_done;
 536        }
 537
 538        is_done = -EIO;
 539
 540        /* Can't write pstate_control to smi_command if either value is zero */
 541        if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 542                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 543                module_put(calling_module);
 544                return 0;
 545        }
 546
 547        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 548                          "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 549                          acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 550
 551        status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 552                                    (u32) acpi_gbl_FADT.pstate_control, 8);
 553        if (ACPI_FAILURE(status)) {
 554                ACPI_EXCEPTION((AE_INFO, status,
 555                                "Failed to write pstate_control [0x%x] to "
 556                                "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 557                                acpi_gbl_FADT.smi_command));
 558                module_put(calling_module);
 559                return status;
 560        }
 561
 562        /* Success. If there's no _PPC, we need to fear nothing, so
 563         * we can allow the cpufreq driver to be rmmod'ed. */
 564        is_done = 1;
 565
 566        if (!(acpi_processor_ppc_status & PPC_IN_USE))
 567                module_put(calling_module);
 568
 569        return 0;
 570}
 571
 572EXPORT_SYMBOL(acpi_processor_notify_smm);
 573
 574static int acpi_processor_get_psd(struct acpi_processor *pr)
 575{
 576        int result = 0;
 577        acpi_status status = AE_OK;
 578        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 579        struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 580        struct acpi_buffer state = {0, NULL};
 581        union acpi_object  *psd = NULL;
 582        struct acpi_psd_package *pdomain;
 583
 584        status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 585        if (ACPI_FAILURE(status)) {
 586                return -ENODEV;
 587        }
 588
 589        psd = buffer.pointer;
 590        if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 591                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 592                result = -EFAULT;
 593                goto end;
 594        }
 595
 596        if (psd->package.count != 1) {
 597                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 598                result = -EFAULT;
 599                goto end;
 600        }
 601
 602        pdomain = &(pr->performance->domain_info);
 603
 604        state.length = sizeof(struct acpi_psd_package);
 605        state.pointer = pdomain;
 606
 607        status = acpi_extract_package(&(psd->package.elements[0]),
 608                &format, &state);
 609        if (ACPI_FAILURE(status)) {
 610                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 611                result = -EFAULT;
 612                goto end;
 613        }
 614
 615        if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 616                printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 617                result = -EFAULT;
 618                goto end;
 619        }
 620
 621        if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 622                printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 623                result = -EFAULT;
 624                goto end;
 625        }
 626
 627        if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 628            pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 629            pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 630                printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 631                result = -EFAULT;
 632                goto end;
 633        }
 634end:
 635        kfree(buffer.pointer);
 636        return result;
 637}
 638
 639int acpi_processor_preregister_performance(
 640                struct acpi_processor_performance __percpu *performance)
 641{
 642        int count, count_target;
 643        int retval = 0;
 644        unsigned int i, j;
 645        cpumask_var_t covered_cpus;
 646        struct acpi_processor *pr;
 647        struct acpi_psd_package *pdomain;
 648        struct acpi_processor *match_pr;
 649        struct acpi_psd_package *match_pdomain;
 650
 651        if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 652                return -ENOMEM;
 653
 654        mutex_lock(&performance_mutex);
 655
 656        /*
 657         * Check if another driver has already registered, and abort before
 658         * changing pr->performance if it has. Check input data as well.
 659         */
 660        for_each_possible_cpu(i) {
 661                pr = per_cpu(processors, i);
 662                if (!pr) {
 663                        /* Look only at processors in ACPI namespace */
 664                        continue;
 665                }
 666
 667                if (pr->performance) {
 668                        retval = -EBUSY;
 669                        goto err_out;
 670                }
 671
 672                if (!performance || !per_cpu_ptr(performance, i)) {
 673                        retval = -EINVAL;
 674                        goto err_out;
 675                }
 676        }
 677
 678        /* Call _PSD for all CPUs */
 679        for_each_possible_cpu(i) {
 680                pr = per_cpu(processors, i);
 681                if (!pr)
 682                        continue;
 683
 684                pr->performance = per_cpu_ptr(performance, i);
 685                cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 686                if (acpi_processor_get_psd(pr)) {
 687                        retval = -EINVAL;
 688                        continue;
 689                }
 690        }
 691        if (retval)
 692                goto err_ret;
 693
 694        /*
 695         * Now that we have _PSD data from all CPUs, lets setup P-state 
 696         * domain info.
 697         */
 698        for_each_possible_cpu(i) {
 699                pr = per_cpu(processors, i);
 700                if (!pr)
 701                        continue;
 702
 703                if (cpumask_test_cpu(i, covered_cpus))
 704                        continue;
 705
 706                pdomain = &(pr->performance->domain_info);
 707                cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 708                cpumask_set_cpu(i, covered_cpus);
 709                if (pdomain->num_processors <= 1)
 710                        continue;
 711
 712                /* Validate the Domain info */
 713                count_target = pdomain->num_processors;
 714                count = 1;
 715                if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 716                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 717                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 718                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 719                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 720                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 721
 722                for_each_possible_cpu(j) {
 723                        if (i == j)
 724                                continue;
 725
 726                        match_pr = per_cpu(processors, j);
 727                        if (!match_pr)
 728                                continue;
 729
 730                        match_pdomain = &(match_pr->performance->domain_info);
 731                        if (match_pdomain->domain != pdomain->domain)
 732                                continue;
 733
 734                        /* Here i and j are in the same domain */
 735
 736                        if (match_pdomain->num_processors != count_target) {
 737                                retval = -EINVAL;
 738                                goto err_ret;
 739                        }
 740
 741                        if (pdomain->coord_type != match_pdomain->coord_type) {
 742                                retval = -EINVAL;
 743                                goto err_ret;
 744                        }
 745
 746                        cpumask_set_cpu(j, covered_cpus);
 747                        cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 748                        count++;
 749                }
 750
 751                for_each_possible_cpu(j) {
 752                        if (i == j)
 753                                continue;
 754
 755                        match_pr = per_cpu(processors, j);
 756                        if (!match_pr)
 757                                continue;
 758
 759                        match_pdomain = &(match_pr->performance->domain_info);
 760                        if (match_pdomain->domain != pdomain->domain)
 761                                continue;
 762
 763                        match_pr->performance->shared_type = 
 764                                        pr->performance->shared_type;
 765                        cpumask_copy(match_pr->performance->shared_cpu_map,
 766                                     pr->performance->shared_cpu_map);
 767                }
 768        }
 769
 770err_ret:
 771        for_each_possible_cpu(i) {
 772                pr = per_cpu(processors, i);
 773                if (!pr || !pr->performance)
 774                        continue;
 775
 776                /* Assume no coordination on any error parsing domain info */
 777                if (retval) {
 778                        cpumask_clear(pr->performance->shared_cpu_map);
 779                        cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 780                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 781                }
 782                pr->performance = NULL; /* Will be set for real in register */
 783        }
 784
 785err_out:
 786        mutex_unlock(&performance_mutex);
 787        free_cpumask_var(covered_cpus);
 788        return retval;
 789}
 790EXPORT_SYMBOL(acpi_processor_preregister_performance);
 791
 792int
 793acpi_processor_register_performance(struct acpi_processor_performance
 794                                    *performance, unsigned int cpu)
 795{
 796        struct acpi_processor *pr;
 797
 798        if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 799                return -EINVAL;
 800
 801        mutex_lock(&performance_mutex);
 802
 803        pr = per_cpu(processors, cpu);
 804        if (!pr) {
 805                mutex_unlock(&performance_mutex);
 806                return -ENODEV;
 807        }
 808
 809        if (pr->performance) {
 810                mutex_unlock(&performance_mutex);
 811                return -EBUSY;
 812        }
 813
 814        WARN_ON(!performance);
 815
 816        pr->performance = performance;
 817
 818        if (acpi_processor_get_performance_info(pr)) {
 819                pr->performance = NULL;
 820                mutex_unlock(&performance_mutex);
 821                return -EIO;
 822        }
 823
 824        mutex_unlock(&performance_mutex);
 825        return 0;
 826}
 827
 828EXPORT_SYMBOL(acpi_processor_register_performance);
 829
 830void
 831acpi_processor_unregister_performance(struct acpi_processor_performance
 832                                      *performance, unsigned int cpu)
 833{
 834        struct acpi_processor *pr;
 835
 836        mutex_lock(&performance_mutex);
 837
 838        pr = per_cpu(processors, cpu);
 839        if (!pr) {
 840                mutex_unlock(&performance_mutex);
 841                return;
 842        }
 843
 844        if (pr->performance)
 845                kfree(pr->performance->states);
 846        pr->performance = NULL;
 847
 848        mutex_unlock(&performance_mutex);
 849
 850        return;
 851}
 852
 853EXPORT_SYMBOL(acpi_processor_unregister_performance);
 854
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