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
  34 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
  35 #include <linux/proc_fs.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/mutex.h>
  38
  39 #include <asm/uaccess.h>
  40 #endif
  41
  42 #ifdef CONFIG_X86
  43 #include <asm/cpufeature.h>
  44 #endif
  45
  46 #include <acpi/acpi_bus.h>
  47 #include <acpi/acpi_drivers.h>
  48 #include <acpi/processor.h>
  49
  50 #define ACPI_PROCESSOR_CLASS            "processor"
  51 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  52 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  53 ACPI_MODULE_NAME("processor_perflib");
  54
  55 static DEFINE_MUTEX(performance_mutex);
  56
  57 /* Use cpufreq debug layer for _PPC changes. */
  58 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
  59                                                 "cpufreq-core", msg)
  60
  61 /*
  62  * _PPC support is implemented as a CPUfreq policy notifier:
  63  * This means each time a CPUfreq driver registered also with
  64  * the ACPI core is asked to change the speed policy, the maximum
  65  * value is adjusted so that it is within the platform limit.
  66  *
  67  * Also, when a new platform limit value is detected, the CPUfreq
  68  * policy is adjusted accordingly.
  69  */
  70
  71 /* ignore_ppc:
  72  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
  73  *       ignore _PPC
  74  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
  75  *  1 -> ignore _PPC totally -> forced by user through boot param
  76  */
  77 static int ignore_ppc = -1;
  78 module_param(ignore_ppc, int, 0644);
  79 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
  80                  "limited by BIOS, this should help");
  81
  82 #define PPC_REGISTERED   1
  83 #define PPC_IN_USE       2
  84
  85 static int acpi_processor_ppc_status;
  86
  87 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  88                                        unsigned long event, void *data)
  89 {
  90         struct cpufreq_policy *policy = data;
  91         struct acpi_processor *pr;
  92         unsigned int ppc = 0;
  93
  94         if (event == CPUFREQ_START && ignore_ppc <= 0) {
  95                 ignore_ppc = 0;
  96                 return 0;
  97         }
  98
  99         if (ignore_ppc)
 100                 return 0;
 101
 102         if (event != CPUFREQ_INCOMPATIBLE)
 103                 return 0;
 104
 105         mutex_lock(&performance_mutex);
 106
 107         pr = per_cpu(processors, policy->cpu);
 108         if (!pr || !pr->performance)
 109                 goto out;
 110
 111         ppc = (unsigned int)pr->performance_platform_limit;
 112
 113         if (ppc >= pr->performance->state_count)
 114                 goto out;
 115
 116         cpufreq_verify_within_limits(policy, 0,
 117                                      pr->performance->states[ppc].
 118                                      core_frequency * 1000);
 119
 120       out:
 121         mutex_unlock(&performance_mutex);
 122
 123         return 0;
 124 }
 125
 126 static struct notifier_block acpi_ppc_notifier_block = {
 127         .notifier_call = acpi_processor_ppc_notifier,
 128 };
 129
 130 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 131 {
 132         acpi_status status = 0;
 133         unsigned long long ppc = 0;
 134
 135
 136         if (!pr)
 137                 return -EINVAL;
 138
 139         /*
 140          * _PPC indicates the maximum state currently supported by the platform
 141          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 142          */
 143         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 144
 145         if (status != AE_NOT_FOUND)
 146                 acpi_processor_ppc_status |= PPC_IN_USE;
 147
 148         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 149                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
 150                 return -ENODEV;
 151         }
 152
 153         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
 154                        (int)ppc, ppc ? "" : "not");
 155
 156         pr->performance_platform_limit = (int)ppc;
 157
 158         return 0;
 159 }
 160
 161 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 162 {
 163         int ret;
 164
 165         if (ignore_ppc)
 166                 return 0;
 167
 168         ret = acpi_processor_get_platform_limit(pr);
 169
 170         if (ret < 0)
 171                 return (ret);
 172         else
 173                 return cpufreq_update_policy(pr->id);
 174 }
 175
 176 void acpi_processor_ppc_init(void)
 177 {
 178         if (!cpufreq_register_notifier
 179             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 180                 acpi_processor_ppc_status |= PPC_REGISTERED;
 181         else
 182                 printk(KERN_DEBUG
 183                        "Warning: Processor Platform Limit not supported.\n");
 184 }
 185
 186 void acpi_processor_ppc_exit(void)
 187 {
 188         if (acpi_processor_ppc_status & PPC_REGISTERED)
 189                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 190                                             CPUFREQ_POLICY_NOTIFIER);
 191
 192         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 193 }
 194
 195 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 196 {
 197         int result = 0;
 198         acpi_status status = 0;
 199         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 200         union acpi_object *pct = NULL;
 201         union acpi_object obj = { 0 };
 202
 203
 204         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 205         if (ACPI_FAILURE(status)) {
 206                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
 207                 return -ENODEV;
 208         }
 209
 210         pct = (union acpi_object *)buffer.pointer;
 211         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 212             || (pct->package.count != 2)) {
 213                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
 214                 result = -EFAULT;
 215                 goto end;
 216         }
 217
 218         /*
 219          * control_register
 220          */
 221
 222         obj = pct->package.elements[0];
 223
 224         if ((obj.type != ACPI_TYPE_BUFFER)
 225             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 226             || (obj.buffer.pointer == NULL)) {
 227                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
 228                 result = -EFAULT;
 229                 goto end;
 230         }
 231         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 232                sizeof(struct acpi_pct_register));
 233
 234         /*
 235          * status_register
 236          */
 237
 238         obj = pct->package.elements[1];
 239
 240         if ((obj.type != ACPI_TYPE_BUFFER)
 241             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 242             || (obj.buffer.pointer == NULL)) {
 243                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
 244                 result = -EFAULT;
 245                 goto end;
 246         }
 247
 248         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 249                sizeof(struct acpi_pct_register));
 250
 251       end:
 252         kfree(buffer.pointer);
 253
 254         return result;
 255 }
 256
 257 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 258 {
 259         int result = 0;
 260         acpi_status status = AE_OK;
 261         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 262         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 263         struct acpi_buffer state = { 0, NULL };
 264         union acpi_object *pss = NULL;
 265         int i;
 266
 267
 268         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 269         if (ACPI_FAILURE(status)) {
 270                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
 271                 return -ENODEV;
 272         }
 273
 274         pss = buffer.pointer;
 275         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 276                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
 277                 result = -EFAULT;
 278                 goto end;
 279         }
 280
 281         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 282                           pss->package.count));
 283
 284         pr->performance->state_count = pss->package.count;
 285         pr->performance->states =
 286             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 287                     GFP_KERNEL);
 288         if (!pr->performance->states) {
 289                 result = -ENOMEM;
 290                 goto end;
 291         }
 292
 293         for (i = 0; i < pr->performance->state_count; i++) {
 294
 295                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 296
 297                 state.length = sizeof(struct acpi_processor_px);
 298                 state.pointer = px;
 299
 300                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 301
 302                 status = acpi_extract_package(&(pss->package.elements[i]),
 303                                               &format, &state);
 304                 if (ACPI_FAILURE(status)) {
 305                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
 306                         result = -EFAULT;
 307                         kfree(pr->performance->states);
 308                         goto end;
 309                 }
 310
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 312                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 313                                   i,
 314                                   (u32) px->core_frequency,
 315                                   (u32) px->power,
 316                                   (u32) px->transition_latency,
 317                                   (u32) px->bus_master_latency,
 318                                   (u32) px->control, (u32) px->status));
 319
 320                 if (!px->core_frequency) {
 321                         printk(KERN_ERR PREFIX
 322                                     "Invalid _PSS data: freq is zero\n");
 323                         result = -EFAULT;
 324                         kfree(pr->performance->states);
 325                         goto end;
 326                 }
 327         }
 328
 329       end:
 330         kfree(buffer.pointer);
 331
 332         return result;
 333 }
 334
 335 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 336 {
 337         int result = 0;
 338         acpi_status status = AE_OK;
 339         acpi_handle handle = NULL;
 340
 341         if (!pr || !pr->performance || !pr->handle)
 342                 return -EINVAL;
 343
 344         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 345         if (ACPI_FAILURE(status)) {
 346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 347                                   "ACPI-based processor performance control unavailable\n"));
 348                 return -ENODEV;
 349         }
 350
 351         result = acpi_processor_get_performance_control(pr);
 352         if (result)
 353                 goto update_bios;
 354
 355         result = acpi_processor_get_performance_states(pr);
 356         if (result)
 357                 goto update_bios;
 358
 359         return 0;
 360
 361         /*
 362          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
 363          * the BIOS is older than the CPU and does not know its frequencies
 364          */
 365  update_bios:
 366 #ifdef CONFIG_X86
 367         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
 368                 if(boot_cpu_has(X86_FEATURE_EST))
 369                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
 370                                "frequency support\n");
 371         }
 372 #endif
 373         return result;
 374 }
 375
 376 int acpi_processor_notify_smm(struct module *calling_module)
 377 {
 378         acpi_status status;
 379         static int is_done = 0;
 380
 381
 382         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 383                 return -EBUSY;
 384
 385         if (!try_module_get(calling_module))
 386                 return -EINVAL;
 387
 388         /* is_done is set to negative if an error occured,
 389          * and to postitive if _no_ error occured, but SMM
 390          * was already notified. This avoids double notification
 391          * which might lead to unexpected results...
 392          */
 393         if (is_done > 0) {
 394                 module_put(calling_module);
 395                 return 0;
 396         } else if (is_done < 0) {
 397                 module_put(calling_module);
 398                 return is_done;
 399         }
 400
 401         is_done = -EIO;
 402
 403         /* Can't write pstate_control to smi_command if either value is zero */
 404         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
 405                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
 406                 module_put(calling_module);
 407                 return 0;
 408         }
 409
 410         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 411                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
 412                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
 413
 414         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
 415                                     (u32) acpi_gbl_FADT.pstate_control, 8);
 416         if (ACPI_FAILURE(status)) {
 417                 ACPI_EXCEPTION((AE_INFO, status,
 418                                 "Failed to write pstate_control [0x%x] to "
 419                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
 420                                 acpi_gbl_FADT.smi_command));
 421                 module_put(calling_module);
 422                 return status;
 423         }
 424
 425         /* Success. If there's no _PPC, we need to fear nothing, so
 426          * we can allow the cpufreq driver to be rmmod'ed. */
 427         is_done = 1;
 428
 429         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 430                 module_put(calling_module);
 431
 432         return 0;
 433 }
 434
 435 EXPORT_SYMBOL(acpi_processor_notify_smm);
 436
 437 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 438 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 439
 440 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 441 static struct file_operations acpi_processor_perf_fops = {
 442         .owner = THIS_MODULE,
 443         .open = acpi_processor_perf_open_fs,
 444         .read = seq_read,
 445         .llseek = seq_lseek,
 446         .release = single_release,
 447 };
 448
 449 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 450 {
 451         struct acpi_processor *pr = seq->private;
 452         int i;
 453
 454
 455         if (!pr)
 456                 goto end;
 457
 458         if (!pr->performance) {
 459                 seq_puts(seq, "<not supported>\n");
 460                 goto end;
 461         }
 462
 463         seq_printf(seq, "state count:             %d\n"
 464                    "active state:            P%d\n",
 465                    pr->performance->state_count, pr->performance->state);
 466
 467         seq_puts(seq, "states:\n");
 468         for (i = 0; i < pr->performance->state_count; i++)
 469                 seq_printf(seq,
 470                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 471                            (i == pr->performance->state ? '*' : ' '), i,
 472                            (u32) pr->performance->states[i].core_frequency,
 473                            (u32) pr->performance->states[i].power,
 474                            (u32) pr->performance->states[i].transition_latency);
 475
 476       end:
 477         return 0;
 478 }
 479
 480 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 481 {
 482         return single_open(file, acpi_processor_perf_seq_show,
 483                            PDE(inode)->data);
 484 }
 485
 486 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 487 {
 488         struct acpi_device *device = NULL;
 489
 490
 491         if (acpi_bus_get_device(pr->handle, &device))
 492                 return;
 493
 494         /* add file 'performance' [R/W] */
 495         proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
 496                          acpi_device_dir(device),
 497                          &acpi_processor_perf_fops, acpi_driver_data(device));
 498         return;
 499 }
 500
 501 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 502 {
 503         struct acpi_device *device = NULL;
 504
 505
 506         if (acpi_bus_get_device(pr->handle, &device))
 507                 return;
 508
 509         /* remove file 'performance' */
 510         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 511                           acpi_device_dir(device));
 512
 513         return;
 514 }
 515
 516 #else
 517 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 518 {
 519         return;
 520 }
 521 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 522 {
 523         return;
 524 }
 525 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 526
 527 static int acpi_processor_get_psd(struct acpi_processor *pr)
 528 {
 529         int result = 0;
 530         acpi_status status = AE_OK;
 531         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 532         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 533         struct acpi_buffer state = {0, NULL};
 534         union acpi_object  *psd = NULL;
 535         struct acpi_psd_package *pdomain;
 536
 537         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 538         if (ACPI_FAILURE(status)) {
 539                 return -ENODEV;
 540         }
 541
 542         psd = buffer.pointer;
 543         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 544                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 545                 result = -EFAULT;
 546                 goto end;
 547         }
 548
 549         if (psd->package.count != 1) {
 550                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 551                 result = -EFAULT;
 552                 goto end;
 553         }
 554
 555         pdomain = &(pr->performance->domain_info);
 556
 557         state.length = sizeof(struct acpi_psd_package);
 558         state.pointer = pdomain;
 559
 560         status = acpi_extract_package(&(psd->package.elements[0]),
 561                 &format, &state);
 562         if (ACPI_FAILURE(status)) {
 563                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
 564                 result = -EFAULT;
 565                 goto end;
 566         }
 567
 568         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 569                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
 570                 result = -EFAULT;
 571                 goto end;
 572         }
 573
 574         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 575                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
 576                 result = -EFAULT;
 577                 goto end;
 578         }
 579
 580 end:
 581         kfree(buffer.pointer);
 582         return result;
 583 }
 584
 585 int acpi_processor_preregister_performance(
 586                 struct acpi_processor_performance *performance)
 587 {
 588         int count, count_target;
 589         int retval = 0;
 590         unsigned int i, j;
 591         cpumask_var_t covered_cpus;
 592         struct acpi_processor *pr;
 593         struct acpi_psd_package *pdomain;
 594         struct acpi_processor *match_pr;
 595         struct acpi_psd_package *match_pdomain;
 596
 597         if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL))
 598                 return -ENOMEM;
 599
 600         mutex_lock(&performance_mutex);
 601
 602         retval = 0;
 603
 604         /* Call _PSD for all CPUs */
 605         for_each_possible_cpu(i) {
 606                 pr = per_cpu(processors, i);
 607                 if (!pr) {
 608                         /* Look only at processors in ACPI namespace */
 609                         continue;
 610                 }
 611
 612                 if (pr->performance) {
 613                         retval = -EBUSY;
 614                         continue;
 615                 }
 616
 617                 if (!performance || !percpu_ptr(performance, i)) {
 618                         retval = -EINVAL;
 619                         continue;
 620                 }
 621
 622                 pr->performance = percpu_ptr(performance, i);
 623                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 624                 if (acpi_processor_get_psd(pr)) {
 625                         retval = -EINVAL;
 626                         continue;
 627                 }
 628         }
 629         if (retval)
 630                 goto err_ret;
 631
 632         /*
 633          * Now that we have _PSD data from all CPUs, lets setup P-state
 634          * domain info.
 635          */
 636         for_each_possible_cpu(i) {
 637                 pr = per_cpu(processors, i);
 638                 if (!pr)
 639                         continue;
 640
 641                 /* Basic validity check for domain info */
 642                 pdomain = &(pr->performance->domain_info);
 643                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 644                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 645                         retval = -EINVAL;
 646                         goto err_ret;
 647                 }
 648                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 649                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 650                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 651                         retval = -EINVAL;
 652                         goto err_ret;
 653                 }
 654         }
 655
 656         cpumask_clear(covered_cpus);
 657         for_each_possible_cpu(i) {
 658                 pr = per_cpu(processors, i);
 659                 if (!pr)
 660                         continue;
 661
 662                 if (cpumask_test_cpu(i, covered_cpus))
 663                         continue;
 664
 665                 pdomain = &(pr->performance->domain_info);
 666                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 667                 cpumask_set_cpu(i, covered_cpus);
 668                 if (pdomain->num_processors <= 1)
 669                         continue;
 670
 671                 /* Validate the Domain info */
 672                 count_target = pdomain->num_processors;
 673                 count = 1;
 674                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 675                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 676                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 677                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
 678                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 679                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 680
 681                 for_each_possible_cpu(j) {
 682                         if (i == j)
 683                                 continue;
 684
 685                         match_pr = per_cpu(processors, j);
 686                         if (!match_pr)
 687                                 continue;
 688
 689                         match_pdomain = &(match_pr->performance->domain_info);
 690                         if (match_pdomain->domain != pdomain->domain)
 691                                 continue;
 692
 693                         /* Here i and j are in the same domain */
 694
 695                         if (match_pdomain->num_processors != count_target) {
 696                                 retval = -EINVAL;
 697                                 goto err_ret;
 698                         }
 699
 700                         if (pdomain->coord_type != match_pdomain->coord_type) {
 701                                 retval = -EINVAL;
 702                                 goto err_ret;
 703                         }
 704
 705                         cpumask_set_cpu(j, covered_cpus);
 706                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
 707                         count++;
 708                 }
 709
 710                 for_each_possible_cpu(j) {
 711                         if (i == j)
 712                                 continue;
 713
 714                         match_pr = per_cpu(processors, j);
 715                         if (!match_pr)
 716                                 continue;
 717
 718                         match_pdomain = &(match_pr->performance->domain_info);
 719                         if (match_pdomain->domain != pdomain->domain)
 720                                 continue;
 721
 722                         match_pr->performance->shared_type =
 723                                         pr->performance->shared_type;
 724                         cpumask_copy(match_pr->performance->shared_cpu_map,
 725                                      pr->performance->shared_cpu_map);
 726                 }
 727         }
 728
 729 err_ret:
 730         for_each_possible_cpu(i) {
 731                 pr = per_cpu(processors, i);
 732                 if (!pr || !pr->performance)
 733                         continue;
 734
 735                 /* Assume no coordination on any error parsing domain info */
 736                 if (retval) {
 737                         cpumask_clear(pr->performance->shared_cpu_map);
 738                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
 739                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 740                 }
 741                 pr->performance = NULL; /* Will be set for real in register */
 742         }
 743
 744         mutex_unlock(&performance_mutex);
 745         free_cpumask_var(covered_cpus);
 746         return retval;
 747 }
 748 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 749
 750
 751 int
 752 acpi_processor_register_performance(struct acpi_processor_performance
 753                                     *performance, unsigned int cpu)
 754 {
 755         struct acpi_processor *pr;
 756
 757
 758         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 759                 return -EINVAL;
 760
 761         mutex_lock(&performance_mutex);
 762
 763         pr = per_cpu(processors, cpu);
 764         if (!pr) {
 765                 mutex_unlock(&performance_mutex);
 766                 return -ENODEV;
 767         }
 768
 769         if (pr->performance) {
 770                 mutex_unlock(&performance_mutex);
 771                 return -EBUSY;
 772         }
 773
 774         WARN_ON(!performance);
 775
 776         pr->performance = performance;
 777
 778         if (acpi_processor_get_performance_info(pr)) {
 779                 pr->performance = NULL;
 780                 mutex_unlock(&performance_mutex);
 781                 return -EIO;
 782         }
 783
 784         acpi_cpufreq_add_file(pr);
 785
 786         mutex_unlock(&performance_mutex);
 787         return 0;
 788 }
 789
 790 EXPORT_SYMBOL(acpi_processor_register_performance);
 791
 792 void
 793 acpi_processor_unregister_performance(struct acpi_processor_performance
 794                                       *performance, unsigned int cpu)
 795 {
 796         struct acpi_processor *pr;
 797
 798
 799         mutex_lock(&performance_mutex);
 800
 801         pr = per_cpu(processors, cpu);
 802         if (!pr) {
 803                 mutex_unlock(&performance_mutex);
 804                 return;
 805         }
 806
 807         if (pr->performance)
 808                 kfree(pr->performance->states);
 809         pr->performance = NULL;
 810
 811         acpi_cpufreq_remove_file(pr);
 812
 813         mutex_unlock(&performance_mutex);
 814
 815         return;
 816 }
 817
 818 EXPORT_SYMBOL(acpi_processor_unregister_performance);