linux/drivers/acpi/processor_perflib.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
   4 *
   5 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7 *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   8 *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   9 *                      - Added processor hotplug support
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/init.h>
  15#include <linux/cpufreq.h>
  16#include <linux/slab.h>
  17#include <linux/acpi.h>
  18#include <acpi/processor.h>
  19#ifdef CONFIG_X86
  20#include <asm/cpufeature.h>
  21#endif
  22
  23#define PREFIX "ACPI: "
  24
  25#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  26
  27static DEFINE_MUTEX(performance_mutex);
  28
  29/*
  30 * _PPC support is implemented as a CPUfreq policy notifier:
  31 * This means each time a CPUfreq driver registered also with
  32 * the ACPI core is asked to change the speed policy, the maximum
  33 * value is adjusted so that it is within the platform limit.
  34 *
  35 * Also, when a new platform limit value is detected, the CPUfreq
  36 * policy is adjusted accordingly.
  37 */
  38
  39/* ignore_ppc:
  40 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  41 *       ignore _PPC
  42 *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  43 *  1 -> ignore _PPC totally -> forced by user through boot param
  44 */
  45static int ignore_ppc = -1;
  46module_param(ignore_ppc, int, 0644);
  47MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  48                 "limited by BIOS, this should help");
  49
  50static bool acpi_processor_ppc_in_use;
  51
  52static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
  53{
  54        acpi_status status = 0;
  55        unsigned long long ppc = 0;
  56        int ret;
  57
  58        if (!pr)
  59                return -EINVAL;
  60
  61        /*
  62         * _PPC indicates the maximum state currently supported by the platform
  63         * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
  64         */
  65        status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
  66        if (status != AE_NOT_FOUND) {
  67                acpi_processor_ppc_in_use = true;
  68
  69                if (ACPI_FAILURE(status)) {
  70                        acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
  71                        return -ENODEV;
  72                }
  73        }
  74
  75        pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
  76                       (int)ppc, ppc ? "" : "not");
  77
  78        pr->performance_platform_limit = (int)ppc;
  79
  80        if (ppc >= pr->performance->state_count ||
  81            unlikely(!freq_qos_request_active(&pr->perflib_req)))
  82                return 0;
  83
  84        ret = freq_qos_update_request(&pr->perflib_req,
  85                        pr->performance->states[ppc].core_frequency * 1000);
  86        if (ret < 0) {
  87                pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
  88                        pr->id, ret);
  89        }
  90
  91        return 0;
  92}
  93
  94#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
  95/*
  96 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
  97 * @handle: ACPI processor handle
  98 * @status: the status code of _PPC evaluation
  99 *      0: success. OSPM is now using the performance state specified.
 100 *      1: failure. OSPM has not changed the number of P-states in use
 101 */
 102static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 103{
 104        if (acpi_has_method(handle, "_OST"))
 105                acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
 106                                  status, NULL);
 107}
 108
 109void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 110{
 111        int ret;
 112
 113        if (ignore_ppc || !pr->performance) {
 114                /*
 115                 * Only when it is notification event, the _OST object
 116                 * will be evaluated. Otherwise it is skipped.
 117                 */
 118                if (event_flag)
 119                        acpi_processor_ppc_ost(pr->handle, 1);
 120                return;
 121        }
 122
 123        ret = acpi_processor_get_platform_limit(pr);
 124        /*
 125         * Only when it is notification event, the _OST object
 126         * will be evaluated. Otherwise it is skipped.
 127         */
 128        if (event_flag) {
 129                if (ret < 0)
 130                        acpi_processor_ppc_ost(pr->handle, 1);
 131                else
 132                        acpi_processor_ppc_ost(pr->handle, 0);
 133        }
 134        if (ret >= 0)
 135                cpufreq_update_limits(pr->id);
 136}
 137
 138int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 139{
 140        struct acpi_processor *pr;
 141
 142        pr = per_cpu(processors, cpu);
 143        if (!pr || !pr->performance || !pr->performance->state_count)
 144                return -ENODEV;
 145        *limit = pr->performance->states[pr->performance_platform_limit].
 146                core_frequency * 1000;
 147        return 0;
 148}
 149EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 150
 151void acpi_processor_ignore_ppc_init(void)
 152{
 153        if (ignore_ppc < 0)
 154                ignore_ppc = 0;
 155}
 156
 157void acpi_processor_ppc_init(struct cpufreq_policy *policy)
 158{
 159        unsigned int cpu;
 160
 161        for_each_cpu(cpu, policy->related_cpus) {
 162                struct acpi_processor *pr = per_cpu(processors, cpu);
 163                int ret;
 164
 165                if (!pr)
 166                        continue;
 167
 168                ret = freq_qos_add_request(&policy->constraints,
 169                                           &pr->perflib_req,
 170                                           FREQ_QOS_MAX, INT_MAX);
 171                if (ret < 0)
 172                        pr_err("Failed to add freq constraint for CPU%d (%d)\n",
 173                               cpu, ret);
 174        }
 175}
 176
 177void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
 178{
 179        unsigned int cpu;
 180
 181        for_each_cpu(cpu, policy->related_cpus) {
 182                struct acpi_processor *pr = per_cpu(processors, cpu);
 183
 184                if (pr)
 185                        freq_qos_remove_request(&pr->perflib_req);
 186        }
 187}
 188
 189static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 190{
 191        int result = 0;
 192        acpi_status status = 0;
 193        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 194        union acpi_object *pct = NULL;
 195        union acpi_object obj = { 0 };
 196
 197
 198        status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 199        if (ACPI_FAILURE(status)) {
 200                acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
 201                return -ENODEV;
 202        }
 203
 204        pct = (union acpi_object *)buffer.pointer;
 205        if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 206            || (pct->package.count != 2)) {
 207                printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 208                result = -EFAULT;
 209                goto end;
 210        }
 211
 212        /*
 213         * control_register
 214         */
 215
 216        obj = pct->package.elements[0];
 217
 218        if ((obj.type != ACPI_TYPE_BUFFER)
 219            || (obj.buffer.length < sizeof(struct acpi_pct_register))
 220            || (obj.buffer.pointer == NULL)) {
 221                printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 222                result = -EFAULT;
 223                goto end;
 224        }
 225        memcpy(&pr->performance->control_register, obj.buffer.pointer,
 226               sizeof(struct acpi_pct_register));
 227
 228        /*
 229         * status_register
 230         */
 231
 232        obj = pct->package.elements[1];
 233
 234        if ((obj.type != ACPI_TYPE_BUFFER)
 235            || (obj.buffer.length < sizeof(struct acpi_pct_register))
 236            || (obj.buffer.pointer == NULL)) {
 237                printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 238                result = -EFAULT;
 239                goto end;
 240        }
 241
 242        memcpy(&pr->performance->status_register, obj.buffer.pointer,
 243               sizeof(struct acpi_pct_register));
 244
 245      end:
 246        kfree(buffer.pointer);
 247
 248        return result;
 249}
 250
 251#ifdef CONFIG_X86
 252/*
 253 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 254 * in their ACPI data. Calculate the real values and fix up the _PSS data.
 255 */
 256static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 257{
 258        u32 hi, lo, fid, did;
 259        int index = px->control & 0x00000007;
 260
 261        if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 262                return;
 263
 264        if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 265            || boot_cpu_data.x86 == 0x11) {
 266                rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 267                /*
 268                 * MSR C001_0064+:
 269                 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 270                 */
 271                if (!(hi & BIT(31)))
 272                        return;
 273
 274                fid = lo & 0x3f;
 275                did = (lo >> 6) & 7;
 276                if (boot_cpu_data.x86 == 0x10)
 277                        px->core_frequency = (100 * (fid + 0x10)) >> did;
 278                else
 279                        px->core_frequency = (100 * (fid + 8)) >> did;
 280        }
 281}
 282#else
 283static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 284#endif
 285
 286static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 287{
 288        int result = 0;
 289        acpi_status status = AE_OK;
 290        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 291        struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 292        struct acpi_buffer state = { 0, NULL };
 293        union acpi_object *pss = NULL;
 294        int i;
 295        int last_invalid = -1;
 296
 297
 298        status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 299        if (ACPI_FAILURE(status)) {
 300                acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
 301                return -ENODEV;
 302        }
 303
 304        pss = buffer.pointer;
 305        if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 306                printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 307                result = -EFAULT;
 308                goto end;
 309        }
 310
 311        acpi_handle_debug(pr->handle, "Found %d performance states\n",
 312                          pss->package.count);
 313
 314        pr->performance->state_count = pss->package.count;
 315        pr->performance->states =
 316            kmalloc_array(pss->package.count,
 317                          sizeof(struct acpi_processor_px),
 318                          GFP_KERNEL);
 319        if (!pr->performance->states) {
 320                result = -ENOMEM;
 321                goto end;
 322        }
 323
 324        for (i = 0; i < pr->performance->state_count; i++) {
 325
 326                struct acpi_processor_px *px = &(pr->performance->states[i]);
 327
 328                state.length = sizeof(struct acpi_processor_px);
 329                state.pointer = px;
 330
 331                acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
 332
 333                status = acpi_extract_package(&(pss->package.elements[i]),
 334                                              &format, &state);
 335                if (ACPI_FAILURE(status)) {
 336                        acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
 337                                         acpi_format_exception(status));
 338                        result = -EFAULT;
 339                        kfree(pr->performance->states);
 340                        goto end;
 341                }
 342
 343                amd_fixup_frequency(px, i);
 344
 345                acpi_handle_debug(pr->handle,
 346                                  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 347                                  i,
 348                                  (u32) px->core_frequency,
 349                                  (u32) px->power,
 350                                  (u32) px->transition_latency,
 351                                  (u32) px->bus_master_latency,
 352                                  (u32) px->control, (u32) px->status);
 353
 354                /*
 355                 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 356                 */
 357                if (!px->core_frequency ||
 358                    ((u32)(px->core_frequency * 1000) !=
 359                     (px->core_frequency * 1000))) {
 360                        printk(KERN_ERR FW_BUG PREFIX
 361                               "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 362                               pr->id, px->core_frequency);
 363                        if (last_invalid == -1)
 364                                last_invalid = i;
 365                } else {
 366                        if (last_invalid != -1) {
 367                                /*
 368                                 * Copy this valid entry over last_invalid entry
 369                                 */
 370                                memcpy(&(pr->performance->states[last_invalid]),
 371                                       px, sizeof(struct acpi_processor_px));
 372                                ++last_invalid;
 373                        }
 374                }
 375        }
 376
 377        if (last_invalid == 0) {
 378                printk(KERN_ERR FW_BUG PREFIX
 379                       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 380                result = -EFAULT;
 381                kfree(pr->performance->states);
 382                pr->performance->states = NULL;
 383        }
 384
 385        if (last_invalid > 0)
 386                pr->performance->state_count = last_invalid;
 387
 388      end:
 389        kfree(buffer.pointer);
 390
 391        return result;
 392}
 393
 394int acpi_processor_get_performance_info(struct acpi_processor *pr)
 395{
 396        int result = 0;
 397
 398        if (!pr || !pr->performance || !pr->handle)
 399                return -EINVAL;
 400
 401        if (!acpi_has_method(pr->handle, "_PCT")) {
 402                acpi_handle_debug(pr->handle,
 403                                  "ACPI-based processor performance control unavailable\n");
 404                return -ENODEV;
 405        }
 406
 407        result = acpi_processor_get_performance_control(pr);
 408        if (result)
 409                goto update_bios;
 410
 411        result = acpi_processor_get_performance_states(pr);
 412        if (result)
 413                goto update_bios;
 414
 415        /* We need to call _PPC once when cpufreq starts */
 416        if (ignore_ppc != 1)
 417                result = acpi_processor_get_platform_limit(pr);
 418
 419        return result;
 420
 421        /*
 422         * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 423         * the BIOS is older than the CPU and does not know its frequencies
 424         */
 425 update_bios:
 426#ifdef CONFIG_X86
 427        if (acpi_has_method(pr->handle, "_PPC")) {
 428                if(boot_cpu_has(X86_FEATURE_EST))
 429                        printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 430                               "frequency support\n");
 431        }
 432#endif
 433        return result;
 434}
 435EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 436
 437int acpi_processor_pstate_control(void)
 438{
 439        acpi_status status;
 440
 441        if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
 442                return 0;
 443
 444        pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 445                 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
 446
 447        status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 448                                    (u32)acpi_gbl_FADT.pstate_control, 8);
 449        if (ACPI_SUCCESS(status))
 450                return 1;
 451
 452        pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
 453                acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
 454                acpi_format_exception(status));
 455        return -EIO;
 456}
 457
 458int acpi_processor_notify_smm(struct module *calling_module)
 459{
 460        static int is_done;
 461        int result;
 462
 463        if (!acpi_processor_cpufreq_init)
 464                return -EBUSY;
 465
 466        if (!try_module_get(calling_module))
 467                return -EINVAL;
 468
 469        /* is_done is set to negative if an error occurred,
 470         * and to postitive if _no_ error occurred, but SMM
 471         * was already notified. This avoids double notification
 472         * which might lead to unexpected results...
 473         */
 474        if (is_done > 0) {
 475                module_put(calling_module);
 476                return 0;
 477        } else if (is_done < 0) {
 478                module_put(calling_module);
 479                return is_done;
 480        }
 481
 482        is_done = -EIO;
 483
 484        result = acpi_processor_pstate_control();
 485        if (!result) {
 486                pr_debug("No SMI port or pstate_control\n");
 487                module_put(calling_module);
 488                return 0;
 489        }
 490        if (result < 0) {
 491                module_put(calling_module);
 492                return result;
 493        }
 494
 495        /* Success. If there's no _PPC, we need to fear nothing, so
 496         * we can allow the cpufreq driver to be rmmod'ed. */
 497        is_done = 1;
 498
 499        if (!acpi_processor_ppc_in_use)
 500                module_put(calling_module);
 501
 502        return 0;
 503}
 504
 505EXPORT_SYMBOL(acpi_processor_notify_smm);
 506
 507int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
 508{
 509        int result = 0;
 510        acpi_status status = AE_OK;
 511        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 512        struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 513        struct acpi_buffer state = {0, NULL};
 514        union acpi_object  *psd = NULL;
 515
 516        status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
 517        if (ACPI_FAILURE(status)) {
 518                return -ENODEV;
 519        }
 520
 521        psd = buffer.pointer;
 522        if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 523                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 524                result = -EFAULT;
 525                goto end;
 526        }
 527
 528        if (psd->package.count != 1) {
 529                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 530                result = -EFAULT;
 531                goto end;
 532        }
 533
 534        state.length = sizeof(struct acpi_psd_package);
 535        state.pointer = pdomain;
 536
 537        status = acpi_extract_package(&(psd->package.elements[0]),
 538                &format, &state);
 539        if (ACPI_FAILURE(status)) {
 540                printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 541                result = -EFAULT;
 542                goto end;
 543        }
 544
 545        if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 546                printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 547                result = -EFAULT;
 548                goto end;
 549        }
 550
 551        if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 552                printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 553                result = -EFAULT;
 554                goto end;
 555        }
 556
 557        if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 558            pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 559            pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 560                printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 561                result = -EFAULT;
 562                goto end;
 563        }
 564end:
 565        kfree(buffer.pointer);
 566        return result;
 567}
 568EXPORT_SYMBOL(acpi_processor_get_psd);
 569
 570int acpi_processor_preregister_performance(
 571                struct acpi_processor_performance __percpu *performance)
 572{
 573        int count_target;
 574        int retval = 0;
 575        unsigned int i, j;
 576        cpumask_var_t covered_cpus;
 577        struct acpi_processor *pr;
 578        struct acpi_psd_package *pdomain;
 579        struct acpi_processor *match_pr;
 580        struct acpi_psd_package *match_pdomain;
 581
 582        if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 583                return -ENOMEM;
 584
 585        mutex_lock(&performance_mutex);
 586
 587        /*
 588         * Check if another driver has already registered, and abort before
 589         * changing pr->performance if it has. Check input data as well.
 590         */
 591        for_each_possible_cpu(i) {
 592                pr = per_cpu(processors, i);
 593                if (!pr) {
 594                        /* Look only at processors in ACPI namespace */
 595                        continue;
 596                }
 597
 598                if (pr->performance) {
 599                        retval = -EBUSY;
 600                        goto err_out;
 601                }
 602
 603                if (!performance || !per_cpu_ptr(performance, i)) {
 604                        retval = -EINVAL;
 605                        goto err_out;
 606                }
 607        }
 608
 609        /* Call _PSD for all CPUs */
 610        for_each_possible_cpu(i) {
 611                pr = per_cpu(processors, i);
 612                if (!pr)
 613                        continue;
 614
 615                pr->performance = per_cpu_ptr(performance, i);
 616                pdomain = &(pr->performance->domain_info);
 617                if (acpi_processor_get_psd(pr->handle, pdomain)) {
 618                        retval = -EINVAL;
 619                        continue;
 620                }
 621        }
 622        if (retval)
 623                goto err_ret;
 624
 625        /*
 626         * Now that we have _PSD data from all CPUs, lets setup P-state
 627         * domain info.
 628         */
 629        for_each_possible_cpu(i) {
 630                pr = per_cpu(processors, i);
 631                if (!pr)
 632                        continue;
 633
 634                if (cpumask_test_cpu(i, covered_cpus))
 635                        continue;
 636
 637                pdomain = &(pr->performance->domain_info);
 638                cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 639                cpumask_set_cpu(i, covered_cpus);
 640                if (pdomain->num_processors <= 1)
 641                        continue;
 642
 643                /* Validate the Domain info */
 644                count_target = pdomain->num_processors;
 645                if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 646                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 647                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 648                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 649                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 650                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 651
 652                for_each_possible_cpu(j) {
 653                        if (i == j)
 654                                continue;
 655
 656                        match_pr = per_cpu(processors, j);
 657                        if (!match_pr)
 658                                continue;
 659
 660                        match_pdomain = &(match_pr->performance->domain_info);
 661                        if (match_pdomain->domain != pdomain->domain)
 662                                continue;
 663
 664                        /* Here i and j are in the same domain */
 665
 666                        if (match_pdomain->num_processors != count_target) {
 667                                retval = -EINVAL;
 668                                goto err_ret;
 669                        }
 670
 671                        if (pdomain->coord_type != match_pdomain->coord_type) {
 672                                retval = -EINVAL;
 673                                goto err_ret;
 674                        }
 675
 676                        cpumask_set_cpu(j, covered_cpus);
 677                        cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 678                }
 679
 680                for_each_possible_cpu(j) {
 681                        if (i == j)
 682                                continue;
 683
 684                        match_pr = per_cpu(processors, j);
 685                        if (!match_pr)
 686                                continue;
 687
 688                        match_pdomain = &(match_pr->performance->domain_info);
 689                        if (match_pdomain->domain != pdomain->domain)
 690                                continue;
 691
 692                        match_pr->performance->shared_type =
 693                                        pr->performance->shared_type;
 694                        cpumask_copy(match_pr->performance->shared_cpu_map,
 695                                     pr->performance->shared_cpu_map);
 696                }
 697        }
 698
 699err_ret:
 700        for_each_possible_cpu(i) {
 701                pr = per_cpu(processors, i);
 702                if (!pr || !pr->performance)
 703                        continue;
 704
 705                /* Assume no coordination on any error parsing domain info */
 706                if (retval) {
 707                        cpumask_clear(pr->performance->shared_cpu_map);
 708                        cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 709                        pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
 710                }
 711                pr->performance = NULL; /* Will be set for real in register */
 712        }
 713
 714err_out:
 715        mutex_unlock(&performance_mutex);
 716        free_cpumask_var(covered_cpus);
 717        return retval;
 718}
 719EXPORT_SYMBOL(acpi_processor_preregister_performance);
 720
 721int
 722acpi_processor_register_performance(struct acpi_processor_performance
 723                                    *performance, unsigned int cpu)
 724{
 725        struct acpi_processor *pr;
 726
 727        if (!acpi_processor_cpufreq_init)
 728                return -EINVAL;
 729
 730        mutex_lock(&performance_mutex);
 731
 732        pr = per_cpu(processors, cpu);
 733        if (!pr) {
 734                mutex_unlock(&performance_mutex);
 735                return -ENODEV;
 736        }
 737
 738        if (pr->performance) {
 739                mutex_unlock(&performance_mutex);
 740                return -EBUSY;
 741        }
 742
 743        WARN_ON(!performance);
 744
 745        pr->performance = performance;
 746
 747        if (acpi_processor_get_performance_info(pr)) {
 748                pr->performance = NULL;
 749                mutex_unlock(&performance_mutex);
 750                return -EIO;
 751        }
 752
 753        mutex_unlock(&performance_mutex);
 754        return 0;
 755}
 756
 757EXPORT_SYMBOL(acpi_processor_register_performance);
 758
 759void acpi_processor_unregister_performance(unsigned int cpu)
 760{
 761        struct acpi_processor *pr;
 762
 763        mutex_lock(&performance_mutex);
 764
 765        pr = per_cpu(processors, cpu);
 766        if (!pr) {
 767                mutex_unlock(&performance_mutex);
 768                return;
 769        }
 770
 771        if (pr->performance)
 772                kfree(pr->performance->states);
 773        pr->performance = NULL;
 774
 775        mutex_unlock(&performance_mutex);
 776
 777        return;
 778}
 779
 780EXPORT_SYMBOL(acpi_processor_unregister_performance);
 781