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