drivers/acpi/processor_perflib.c

   1 /*
   2  * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  *
  11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or (at
  16  *  your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful, but
  19  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  *  General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  26  *
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/cpufreq.h>
  33 #include <linux/slab.h>
  34
  35 #ifdef CONFIG_X86
  36 #include <asm/cpufeature.h>
  37 #endif
  38
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <acpi/processor.h>
  42
  43 #define PREFIX "ACPI: "
  44
  45 #define ACPI_PROCESSOR_CLASS            "processor"
  46 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  47 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  48 ACPI_MODULE_NAME("processor_perflib");
  49
  50 static DEFINE_MUTEX(performance_mutex);
  51
  52 /*
  53  * _PPC support is implemented as a CPUfreq policy notifier:
  54  * This means each time a CPUfreq driver registered also with
  55  * the ACPI core is asked to change the speed policy, the maximum
  56  * value is adjusted so that it is within the platform limit.
  57  *
  58  * Also, when a new platform limit value is detected, the CPUfreq
  59  * policy is adjusted accordingly.
  60  */
  61
  62 /* ignore_ppc:
  63  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  64  *       ignore _PPC
  65  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  66  *  1 -> ignore _PPC totally -> forced by user through boot param
  67  */
  68 static int ignore_ppc = -1;
  69 module_param(ignore_ppc, int, 0644);
  70 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  71                  "limited by BIOS, this should help");
  72
  73 #define PPC_REGISTERED   1
  74 #define PPC_IN_USE       2
  75
  76 static int acpi_processor_ppc_status;
  77
  78 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  79                                        unsigned long event, void *data)
  80 {
  81         struct cpufreq_policy *policy = data;
  82         struct acpi_processor *pr;
  83         unsigned int ppc = 0;
  84
  85         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  86                 ignore_ppc = 0;
  87                 return 0;
  88         }
  89
  90         if (ignore_ppc)
  91                 return 0;
  92
  93         if (event != CPUFREQ_INCOMPATIBLE)
  94                 return 0;
  95
  96         mutex_lock(&performance_mutex);
  97
  98         pr = per_cpu(processors, policy->cpu);
  99         if (!pr || !pr->performance)
 100                 goto out;
 101
 102         ppc = (unsigned int)pr->performance_platform_limit;
 103
 104         if (ppc >= pr->performance->state_count)
 105                 goto out;
 106
 107         cpufreq_verify_within_limits(policy, 0,
 108                                      pr->performance->states[ppc].
 109                                      core_frequency * 1000);
 110
 111       out:
 112         mutex_unlock(&performance_mutex);
 113
 114         return 0;
 115 }
 116
 117 static struct notifier_block acpi_ppc_notifier_block = {
 118         .notifier_call = acpi_processor_ppc_notifier,
 119 };
 120
 121 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 122 {
 123         acpi_status status = 0;
 124         unsigned long long ppc = 0;
 125
 126
 127         if (!pr)
 128                 return -EINVAL;
 129
 130         /*
 131          * _PPC indicates the maximum state currently supported by the platform
 132          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 133          */
 134         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 135
 136         if (status != AE_NOT_FOUND)
 137                 acpi_processor_ppc_status |= PPC_IN_USE;
 138
 139         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 140                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 141                 return -ENODEV;
 142         }
 143
 144         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 145                        (int)ppc, ppc ? "" : "not");
 146
 147         pr->performance_platform_limit = (int)ppc;
 148
 149         return 0;
 150 }
 151
 152 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
 153 /*
 154  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 155  * @handle: ACPI processor handle
 156  * @status: the status code of _PPC evaluation
 157  *      0: success. OSPM is now using the performance state specificed.
 158  *      1: failure. OSPM has not changed the number of P-states in use
 159  */
 160 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
 161 {
 162         union acpi_object params[2] = {
 163                 {.type = ACPI_TYPE_INTEGER,},
 164                 {.type = ACPI_TYPE_INTEGER,},
 165         };
 166         struct acpi_object_list arg_list = {2, params};
 167
 168         if (acpi_has_method(handle, "_OST")) {
 169                 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
 170                 params[1].integer.value =  status;
 171                 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
 172         }
 173 }
 174
 175 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 176 {
 177         int ret;
 178
 179         if (ignore_ppc) {
 180                 /*
 181                  * Only when it is notification event, the _OST object
 182                  * will be evaluated. Otherwise it is skipped.
 183                  */
 184                 if (event_flag)
 185                         acpi_processor_ppc_ost(pr->handle, 1);
 186                 return 0;
 187         }
 188
 189         ret = acpi_processor_get_platform_limit(pr);
 190         /*
 191          * Only when it is notification event, the _OST object
 192          * will be evaluated. Otherwise it is skipped.
 193          */
 194         if (event_flag) {
 195                 if (ret < 0)
 196                         acpi_processor_ppc_ost(pr->handle, 1);
 197                 else
 198                         acpi_processor_ppc_ost(pr->handle, 0);
 199         }
 200         if (ret < 0)
 201                 return (ret);
 202         else
 203                 return cpufreq_update_policy(pr->id);
 204 }
 205
 206 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 207 {
 208         struct acpi_processor *pr;
 209
 210         pr = per_cpu(processors, cpu);
 211         if (!pr || !pr->performance || !pr->performance->state_count)
 212                 return -ENODEV;
 213         *limit = pr->performance->states[pr->performance_platform_limit].
 214                 core_frequency * 1000;
 215         return 0;
 216 }
 217 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
 218
 219 void acpi_processor_ppc_init(void)
 220 {
 221         if (!cpufreq_register_notifier
 222             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 223                 acpi_processor_ppc_status |= PPC_REGISTERED;
 224         else
 225                 printk(KERN_DEBUG
 226                        "Warning: Processor Platform Limit not supported.\n");
 227 }
 228
 229 void acpi_processor_ppc_exit(void)
 230 {
 231         if (acpi_processor_ppc_status & PPC_REGISTERED)
 232                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 233                                             CPUFREQ_POLICY_NOTIFIER);
 234
 235         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 236 }
 237
 238 /*
 239  * Do a quick check if the systems looks like it should use ACPI
 240  * cpufreq. We look at a _PCT method being available, but don't
 241  * do a whole lot of sanity checks.
 242  */
 243 void acpi_processor_load_module(struct acpi_processor *pr)
 244 {
 245         static int requested;
 246         acpi_status status = 0;
 247         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 248
 249         if (!arch_has_acpi_pdc() || requested)
 250                 return;
 251         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 252         if (!ACPI_FAILURE(status)) {
 253                 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
 254                 request_module_nowait("acpi_cpufreq");
 255                 requested = 1;
 256         }
 257         kfree(buffer.pointer);
 258 }
 259
 260 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 261 {
 262         int result = 0;
 263         acpi_status status = 0;
 264         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 265         union acpi_object *pct = NULL;
 266         union acpi_object obj = { 0 };
 267
 268
 269         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 270         if (ACPI_FAILURE(status)) {
 271                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 272                 return -ENODEV;
 273         }
 274
 275         pct = (union acpi_object *)buffer.pointer;
 276         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 277             || (pct->package.count != 2)) {
 278                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 279                 result = -EFAULT;
 280                 goto end;
 281         }
 282
 283         /*
 284          * control_register
 285          */
 286
 287         obj = pct->package.elements[0];
 288
 289         if ((obj.type != ACPI_TYPE_BUFFER)
 290             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 291             || (obj.buffer.pointer == NULL)) {
 292                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 293                 result = -EFAULT;
 294                 goto end;
 295         }
 296         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 297                sizeof(struct acpi_pct_register));
 298
 299         /*
 300          * status_register
 301          */
 302
 303         obj = pct->package.elements[1];
 304
 305         if ((obj.type != ACPI_TYPE_BUFFER)
 306             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 307             || (obj.buffer.pointer == NULL)) {
 308                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 309                 result = -EFAULT;
 310                 goto end;
 311         }
 312
 313         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 314                sizeof(struct acpi_pct_register));
 315
 316       end:
 317         kfree(buffer.pointer);
 318
 319         return result;
 320 }
 321
 322 #ifdef CONFIG_X86
 323 /*
 324  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 325  * in their ACPI data. Calculate the real values and fix up the _PSS data.
 326  */
 327 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
 328 {
 329         u32 hi, lo, fid, did;
 330         int index = px->control & 0x00000007;
 331
 332         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 333                 return;
 334
 335         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
 336             || boot_cpu_data.x86 == 0x11) {
 337                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
 338                 /*
 339                  * MSR C001_0064+:
 340                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
 341                  */
 342                 if (!(hi & BIT(31)))
 343                         return;
 344
 345                 fid = lo & 0x3f;
 346                 did = (lo >> 6) & 7;
 347                 if (boot_cpu_data.x86 == 0x10)
 348                         px->core_frequency = (100 * (fid + 0x10)) >> did;
 349                 else
 350                         px->core_frequency = (100 * (fid + 8)) >> did;
 351         }
 352 }
 353 #else
 354 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
 355 #endif
 356
 357 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 358 {
 359         int result = 0;
 360         acpi_status status = AE_OK;
 361         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 362         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 363         struct acpi_buffer state = { 0, NULL };
 364         union acpi_object *pss = NULL;
 365         int i;
 366         int last_invalid = -1;
 367
 368
 369         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 370         if (ACPI_FAILURE(status)) {
 371                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 372                 return -ENODEV;
 373         }
 374
 375         pss = buffer.pointer;
 376         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 377                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 378                 result = -EFAULT;
 379                 goto end;
 380         }
 381
 382         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 383                           pss->package.count));
 384
 385         pr->performance->state_count = pss->package.count;
 386         pr->performance->states =
 387             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 388                     GFP_KERNEL);
 389         if (!pr->performance->states) {
 390                 result = -ENOMEM;
 391                 goto end;
 392         }
 393
 394         for (i = 0; i < pr->performance->state_count; i++) {
 395
 396                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 397
 398                 state.length = sizeof(struct acpi_processor_px);
 399                 state.pointer = px;
 400
 401                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 402
 403                 status = acpi_extract_package(&(pss->package.elements[i]),
 404                                               &format, &state);
 405                 if (ACPI_FAILURE(status)) {
 406                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 407                         result = -EFAULT;
 408                         kfree(pr->performance->states);
 409                         goto end;
 410                 }
 411
 412                 amd_fixup_frequency(px, i);
 413
 414                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 415                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 416                                   i,
 417                                   (u32) px->core_frequency,
 418                                   (u32) px->power,
 419                                   (u32) px->transition_latency,
 420                                   (u32) px->bus_master_latency,
 421                                   (u32) px->control, (u32) px->status));
 422
 423                 /*
 424                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
 425                  */
 426                 if (!px->core_frequency ||
 427                     ((u32)(px->core_frequency * 1000) !=
 428                      (px->core_frequency * 1000))) {
 429                         printk(KERN_ERR FW_BUG PREFIX
 430                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
 431                                pr->id, px->core_frequency);
 432                         if (last_invalid == -1)
 433                                 last_invalid = i;
 434                 } else {
 435                         if (last_invalid != -1) {
 436                                 /*
 437                                  * Copy this valid entry over last_invalid entry
 438                                  */
 439                                 memcpy(&(pr->performance->states[last_invalid]),
 440                                        px, sizeof(struct acpi_processor_px));
 441                                 ++last_invalid;
 442                         }
 443                 }
 444         }
 445
 446         if (last_invalid == 0) {
 447                 printk(KERN_ERR FW_BUG PREFIX
 448                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
 449                 result = -EFAULT;
 450                 kfree(pr->performance->states);
 451                 pr->performance->states = NULL;
 452         }
 453
 454         if (last_invalid > 0)
 455                 pr->performance->state_count = last_invalid;
 456
 457       end:
 458         kfree(buffer.pointer);
 459
 460         return result;
 461 }
 462
 463 int acpi_processor_get_performance_info(struct acpi_processor *pr)
 464 {
 465         int result = 0;
 466
 467         if (!pr || !pr->performance || !pr->handle)
 468                 return -EINVAL;
 469
 470         if (!acpi_has_method(pr->handle, "_PCT")) {
 471                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 472                                   "ACPI-based processor performance control unavailable\n"));
 473                 return -ENODEV;
 474         }
 475
 476         result = acpi_processor_get_performance_control(pr);
 477         if (result)
 478                 goto update_bios;
 479
 480         result = acpi_processor_get_performance_states(pr);
 481         if (result)
 482                 goto update_bios;
 483
 484         /* We need to call _PPC once when cpufreq starts */
 485         if (ignore_ppc != 1)
 486                 result = acpi_processor_get_platform_limit(pr);
 487
 488         return result;
 489
 490         /*
 491          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 492          * the BIOS is older than the CPU and does not know its frequencies
 493          */
 494  update_bios:
 495 #ifdef CONFIG_X86
 496         if (acpi_has_method(pr->handle, "_PPC")) {
 497                 if(boot_cpu_has(X86_FEATURE_EST))
 498                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 499                                "frequency support\n");
 500         }
 501 #endif
 502         return result;
 503 }
 504 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
 505 int acpi_processor_notify_smm(struct module *calling_module)
 506 {
 507         acpi_status status;
 508         static int is_done = 0;
 509
 510
 511         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 512                 return -EBUSY;
 513
 514         if (!try_module_get(calling_module))
 515                 return -EINVAL;
 516
 517         /* is_done is set to negative if an error occurred,
 518          * and to postitive if _no_ error occurred, but SMM
 519          * was already notified. This avoids double notification
 520          * which might lead to unexpected results...
 521          */
 522         if (is_done > 0) {
 523                 module_put(calling_module);
 524                 return 0;
 525         } else if (is_done < 0) {
 526                 module_put(calling_module);
 527                 return is_done;
 528         }
 529
 530         is_done = -EIO;
 531
 532         /* Can't write pstate_control to smi_command if either value is zero */
 533         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 535                 module_put(calling_module);
 536                 return 0;
 537         }
 538
 539         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 540                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 541                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 542
 543         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 544                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 545         if (ACPI_FAILURE(status)) {
 546                 ACPI_EXCEPTION((AE_INFO, status,
 547                                 "Failed to write pstate_control [0x%x] to "
 548                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 549                                 acpi_gbl_FADT.smi_command));
 550                 module_put(calling_module);
 551                 return status;
 552         }
 553
 554         /* Success. If there's no _PPC, we need to fear nothing, so
 555          * we can allow the cpufreq driver to be rmmod'ed. */
 556         is_done = 1;
 557
 558         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 559                 module_put(calling_module);
 560
 561         return 0;
 562 }
 563
 564 EXPORT_SYMBOL(acpi_processor_notify_smm);
 565
 566 static int acpi_processor_get_psd(struct acpi_processor *pr)
 567 {
 568         int result = 0;
 569         acpi_status status = AE_OK;
 570         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 571         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 572         struct acpi_buffer state = {0, NULL};
 573         union acpi_object  *psd = NULL;
 574         struct acpi_psd_package *pdomain;
 575
 576         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 577         if (ACPI_FAILURE(status)) {
 578                 return -ENODEV;
 579         }
 580
 581         psd = buffer.pointer;
 582         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 583                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 584                 result = -EFAULT;
 585                 goto end;
 586         }
 587
 588         if (psd->package.count != 1) {
 589                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 590                 result = -EFAULT;
 591                 goto end;
 592         }
 593
 594         pdomain = &(pr->performance->domain_info);
 595
 596         state.length = sizeof(struct acpi_psd_package);
 597         state.pointer = pdomain;
 598
 599         status = acpi_extract_package(&(psd->package.elements[0]),
 600                 &format, &state);
 601         if (ACPI_FAILURE(status)) {
 602                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 603                 result = -EFAULT;
 604                 goto end;
 605         }
 606
 607         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 608                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 609                 result = -EFAULT;
 610                 goto end;
 611         }
 612
 613         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 614                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 615                 result = -EFAULT;
 616                 goto end;
 617         }
 618
 619         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 620             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 621             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 622                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
 623                 result = -EFAULT;
 624                 goto end;
 625         }
 626 end:
 627         kfree(buffer.pointer);
 628         return result;
 629 }
 630
 631 int acpi_processor_preregister_performance(
 632                 struct acpi_processor_performance __percpu *performance)
 633 {
 634         int count_target;
 635         int retval = 0;
 636         unsigned int i, j;
 637         cpumask_var_t covered_cpus;
 638         struct acpi_processor *pr;
 639         struct acpi_psd_package *pdomain;
 640         struct acpi_processor *match_pr;
 641         struct acpi_psd_package *match_pdomain;
 642
 643         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 644                 return -ENOMEM;
 645
 646         mutex_lock(&performance_mutex);
 647
 648         /*
 649          * Check if another driver has already registered, and abort before
 650          * changing pr->performance if it has. Check input data as well.
 651          */
 652         for_each_possible_cpu(i) {
 653                 pr = per_cpu(processors, i);
 654                 if (!pr) {
 655                         /* Look only at processors in ACPI namespace */
 656                         continue;
 657                 }
 658
 659                 if (pr->performance) {
 660                         retval = -EBUSY;
 661                         goto err_out;
 662                 }
 663
 664                 if (!performance || !per_cpu_ptr(performance, i)) {
 665                         retval = -EINVAL;
 666                         goto err_out;
 667                 }
 668         }
 669
 670         /* Call _PSD for all CPUs */
 671         for_each_possible_cpu(i) {
 672                 pr = per_cpu(processors, i);
 673                 if (!pr)
 674                         continue;
 675
 676                 pr->performance = per_cpu_ptr(performance, i);
 677                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 678                 if (acpi_processor_get_psd(pr)) {
 679                         retval = -EINVAL;
 680                         continue;
 681                 }
 682         }
 683         if (retval)
 684                 goto err_ret;
 685
 686         /*
 687          * Now that we have _PSD data from all CPUs, lets setup P-state
 688          * domain info.
 689          */
 690         for_each_possible_cpu(i) {
 691                 pr = per_cpu(processors, i);
 692                 if (!pr)
 693                         continue;
 694
 695                 if (cpumask_test_cpu(i, covered_cpus))
 696                         continue;
 697
 698                 pdomain = &(pr->performance->domain_info);
 699                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 700                 cpumask_set_cpu(i, covered_cpus);
 701                 if (pdomain->num_processors <= 1)
 702                         continue;
 703
 704                 /* Validate the Domain info */
 705                 count_target = pdomain->num_processors;
 706                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 707                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 708                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 709                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 710                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 711                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 712
 713                 for_each_possible_cpu(j) {
 714                         if (i == j)
 715                                 continue;
 716
 717                         match_pr = per_cpu(processors, j);
 718                         if (!match_pr)
 719                                 continue;
 720
 721                         match_pdomain = &(match_pr->performance->domain_info);
 722                         if (match_pdomain->domain != pdomain->domain)
 723                                 continue;
 724
 725                         /* Here i and j are in the same domain */
 726
 727                         if (match_pdomain->num_processors != count_target) {
 728                                 retval = -EINVAL;
 729                                 goto err_ret;
 730                         }
 731
 732                         if (pdomain->coord_type != match_pdomain->coord_type) {
 733                                 retval = -EINVAL;
 734                                 goto err_ret;
 735                         }
 736
 737                         cpumask_set_cpu(j, covered_cpus);
 738                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 739                 }
 740
 741                 for_each_possible_cpu(j) {
 742                         if (i == j)
 743                                 continue;
 744
 745                         match_pr = per_cpu(processors, j);
 746                         if (!match_pr)
 747                                 continue;
 748
 749                         match_pdomain = &(match_pr->performance->domain_info);
 750                         if (match_pdomain->domain != pdomain->domain)
 751                                 continue;
 752
 753                         match_pr->performance->shared_type =
 754                                         pr->performance->shared_type;
 755                         cpumask_copy(match_pr->performance->shared_cpu_map,
 756                                      pr->performance->shared_cpu_map);
 757                 }
 758         }
 759
 760 err_ret:
 761         for_each_possible_cpu(i) {
 762                 pr = per_cpu(processors, i);
 763                 if (!pr || !pr->performance)
 764                         continue;
 765
 766                 /* Assume no coordination on any error parsing domain info */
 767                 if (retval) {
 768                         cpumask_clear(pr->performance->shared_cpu_map);
 769                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 770                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 771                 }
 772                 pr->performance = NULL; /* Will be set for real in register */
 773         }
 774
 775 err_out:
 776         mutex_unlock(&performance_mutex);
 777         free_cpumask_var(covered_cpus);
 778         return retval;
 779 }
 780 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 781
 782 int
 783 acpi_processor_register_performance(struct acpi_processor_performance
 784                                     *performance, unsigned int cpu)
 785 {
 786         struct acpi_processor *pr;
 787
 788         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 789                 return -EINVAL;
 790
 791         mutex_lock(&performance_mutex);
 792
 793         pr = per_cpu(processors, cpu);
 794         if (!pr) {
 795                 mutex_unlock(&performance_mutex);
 796                 return -ENODEV;
 797         }
 798
 799         if (pr->performance) {
 800                 mutex_unlock(&performance_mutex);
 801                 return -EBUSY;
 802         }
 803
 804         WARN_ON(!performance);
 805
 806         pr->performance = performance;
 807
 808         if (acpi_processor_get_performance_info(pr)) {
 809                 pr->performance = NULL;
 810                 mutex_unlock(&performance_mutex);
 811                 return -EIO;
 812         }
 813
 814         mutex_unlock(&performance_mutex);
 815         return 0;
 816 }
 817
 818 EXPORT_SYMBOL(acpi_processor_register_performance);
 819
 820 void
 821 acpi_processor_unregister_performance(struct acpi_processor_performance
 822                                       *performance, unsigned int cpu)
 823 {
 824         struct acpi_processor *pr;
 825
 826         mutex_lock(&performance_mutex);
 827
 828         pr = per_cpu(processors, cpu);
 829         if (!pr) {
 830                 mutex_unlock(&performance_mutex);
 831                 return;
 832         }
 833
 834         if (pr->performance)
 835                 kfree(pr->performance->states);
 836         pr->performance = NULL;
 837
 838         mutex_unlock(&performance_mutex);
 839
 840         return;
 841 }
 842
 843 EXPORT_SYMBOL(acpi_processor_unregister_performance);