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 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44
  45 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  46 #define ACPI_PROCESSOR_CLASS            "processor"
  47 #define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
  48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
  49 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  50 ACPI_MODULE_NAME("acpi_processor")
  51
  52 static DEFINE_MUTEX(performance_mutex);
  53
  54 /*
  55  * _PPC support is implemented as a CPUfreq policy notifier:
  56  * This means each time a CPUfreq driver registered also with
  57  * the ACPI core is asked to change the speed policy, the maximum
  58  * value is adjusted so that it is within the platform limit.
  59  *
  60  * Also, when a new platform limit value is detected, the CPUfreq
  61  * policy is adjusted accordingly.
  62  */
  63
  64 #define PPC_REGISTERED   1
  65 #define PPC_IN_USE       2
  66
  67 static int acpi_processor_ppc_status = 0;
  68
  69 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
  70                                        unsigned long event, void *data)
  71 {
  72         struct cpufreq_policy *policy = data;
  73         struct acpi_processor *pr;
  74         unsigned int ppc = 0;
  75
  76         mutex_lock(&performance_mutex);
  77
  78         if (event != CPUFREQ_INCOMPATIBLE)
  79                 goto out;
  80
  81         pr = processors[policy->cpu];
  82         if (!pr || !pr->performance)
  83                 goto out;
  84
  85         ppc = (unsigned int)pr->performance_platform_limit;
  86         if (!ppc)
  87                 goto out;
  88
  89         if (ppc > pr->performance->state_count)
  90                 goto out;
  91
  92         cpufreq_verify_within_limits(policy, 0,
  93                                      pr->performance->states[ppc].
  94                                      core_frequency * 1000);
  95
  96       out:
  97         mutex_unlock(&performance_mutex);
  98
  99         return 0;
 100 }
 101
 102 static struct notifier_block acpi_ppc_notifier_block = {
 103         .notifier_call = acpi_processor_ppc_notifier,
 104 };
 105
 106 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 107 {
 108         acpi_status status = 0;
 109         unsigned long ppc = 0;
 110
 111         ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
 112
 113         if (!pr)
 114                 return_VALUE(-EINVAL);
 115
 116         /*
 117          * _PPC indicates the maximum state currently supported by the platform
 118          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 119          */
 120         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
 121
 122         if (status != AE_NOT_FOUND)
 123                 acpi_processor_ppc_status |= PPC_IN_USE;
 124
 125         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 126                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
 127                 return_VALUE(-ENODEV);
 128         }
 129
 130         pr->performance_platform_limit = (int)ppc;
 131
 132         return_VALUE(0);
 133 }
 134
 135 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 136 {
 137         int ret = acpi_processor_get_platform_limit(pr);
 138         if (ret < 0)
 139                 return (ret);
 140         else
 141                 return cpufreq_update_policy(pr->id);
 142 }
 143
 144 void acpi_processor_ppc_init(void)
 145 {
 146         if (!cpufreq_register_notifier
 147             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
 148                 acpi_processor_ppc_status |= PPC_REGISTERED;
 149         else
 150                 printk(KERN_DEBUG
 151                        "Warning: Processor Platform Limit not supported.\n");
 152 }
 153
 154 void acpi_processor_ppc_exit(void)
 155 {
 156         if (acpi_processor_ppc_status & PPC_REGISTERED)
 157                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
 158                                             CPUFREQ_POLICY_NOTIFIER);
 159
 160         acpi_processor_ppc_status &= ~PPC_REGISTERED;
 161 }
 162
 163 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
 164 {
 165         int result = 0;
 166         acpi_status status = 0;
 167         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 168         union acpi_object *pct = NULL;
 169         union acpi_object obj = { 0 };
 170
 171         ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
 172
 173         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
 174         if (ACPI_FAILURE(status)) {
 175                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
 176                 return_VALUE(-ENODEV);
 177         }
 178
 179         pct = (union acpi_object *)buffer.pointer;
 180         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
 181             || (pct->package.count != 2)) {
 182                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
 183                 result = -EFAULT;
 184                 goto end;
 185         }
 186
 187         /*
 188          * control_register
 189          */
 190
 191         obj = pct->package.elements[0];
 192
 193         if ((obj.type != ACPI_TYPE_BUFFER)
 194             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 195             || (obj.buffer.pointer == NULL)) {
 196                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 197                                   "Invalid _PCT data (control_register)\n"));
 198                 result = -EFAULT;
 199                 goto end;
 200         }
 201         memcpy(&pr->performance->control_register, obj.buffer.pointer,
 202                sizeof(struct acpi_pct_register));
 203
 204         /*
 205          * status_register
 206          */
 207
 208         obj = pct->package.elements[1];
 209
 210         if ((obj.type != ACPI_TYPE_BUFFER)
 211             || (obj.buffer.length < sizeof(struct acpi_pct_register))
 212             || (obj.buffer.pointer == NULL)) {
 213                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 214                                   "Invalid _PCT data (status_register)\n"));
 215                 result = -EFAULT;
 216                 goto end;
 217         }
 218
 219         memcpy(&pr->performance->status_register, obj.buffer.pointer,
 220                sizeof(struct acpi_pct_register));
 221
 222       end:
 223         acpi_os_free(buffer.pointer);
 224
 225         return_VALUE(result);
 226 }
 227
 228 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 229 {
 230         int result = 0;
 231         acpi_status status = AE_OK;
 232         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 233         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
 234         struct acpi_buffer state = { 0, NULL };
 235         union acpi_object *pss = NULL;
 236         int i;
 237
 238         ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
 239
 240         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
 241         if (ACPI_FAILURE(status)) {
 242                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
 243                 return_VALUE(-ENODEV);
 244         }
 245
 246         pss = (union acpi_object *)buffer.pointer;
 247         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
 248                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
 249                 result = -EFAULT;
 250                 goto end;
 251         }
 252
 253         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
 254                           pss->package.count));
 255
 256         pr->performance->state_count = pss->package.count;
 257         pr->performance->states =
 258             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
 259                     GFP_KERNEL);
 260         if (!pr->performance->states) {
 261                 result = -ENOMEM;
 262                 goto end;
 263         }
 264
 265         for (i = 0; i < pr->performance->state_count; i++) {
 266
 267                 struct acpi_processor_px *px = &(pr->performance->states[i]);
 268
 269                 state.length = sizeof(struct acpi_processor_px);
 270                 state.pointer = px;
 271
 272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
 273
 274                 status = acpi_extract_package(&(pss->package.elements[i]),
 275                                               &format, &state);
 276                 if (ACPI_FAILURE(status)) {
 277                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 278                                           "Invalid _PSS data\n"));
 279                         result = -EFAULT;
 280                         kfree(pr->performance->states);
 281                         goto end;
 282                 }
 283
 284                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 285                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
 286                                   i,
 287                                   (u32) px->core_frequency,
 288                                   (u32) px->power,
 289                                   (u32) px->transition_latency,
 290                                   (u32) px->bus_master_latency,
 291                                   (u32) px->control, (u32) px->status));
 292
 293                 if (!px->core_frequency) {
 294                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 295                                           "Invalid _PSS data: freq is zero\n"));
 296                         result = -EFAULT;
 297                         kfree(pr->performance->states);
 298                         goto end;
 299                 }
 300         }
 301
 302       end:
 303         acpi_os_free(buffer.pointer);
 304
 305         return_VALUE(result);
 306 }
 307
 308 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
 309 {
 310         int result = 0;
 311         acpi_status status = AE_OK;
 312         acpi_handle handle = NULL;
 313
 314         ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
 315
 316         if (!pr || !pr->performance || !pr->handle)
 317                 return_VALUE(-EINVAL);
 318
 319         status = acpi_get_handle(pr->handle, "_PCT", &handle);
 320         if (ACPI_FAILURE(status)) {
 321                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 322                                   "ACPI-based processor performance control unavailable\n"));
 323                 return_VALUE(-ENODEV);
 324         }
 325
 326         result = acpi_processor_get_performance_control(pr);
 327         if (result)
 328                 return_VALUE(result);
 329
 330         result = acpi_processor_get_performance_states(pr);
 331         if (result)
 332                 return_VALUE(result);
 333
 334         result = acpi_processor_get_platform_limit(pr);
 335         if (result)
 336                 return_VALUE(result);
 337
 338         return_VALUE(0);
 339 }
 340
 341 int acpi_processor_notify_smm(struct module *calling_module)
 342 {
 343         acpi_status status;
 344         static int is_done = 0;
 345
 346         ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
 347
 348         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 349                 return_VALUE(-EBUSY);
 350
 351         if (!try_module_get(calling_module))
 352                 return_VALUE(-EINVAL);
 353
 354         /* is_done is set to negative if an error occured,
 355          * and to postitive if _no_ error occured, but SMM
 356          * was already notified. This avoids double notification
 357          * which might lead to unexpected results...
 358          */
 359         if (is_done > 0) {
 360                 module_put(calling_module);
 361                 return_VALUE(0);
 362         } else if (is_done < 0) {
 363                 module_put(calling_module);
 364                 return_VALUE(is_done);
 365         }
 366
 367         is_done = -EIO;
 368
 369         /* Can't write pstate_cnt to smi_cmd if either value is zero */
 370         if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
 371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
 372                 module_put(calling_module);
 373                 return_VALUE(0);
 374         }
 375
 376         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 377                           "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
 378                           acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
 379
 380         /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
 381          * it anyway, so we need to support it... */
 382         if (acpi_fadt_is_v1) {
 383                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 384                                   "Using v1.0 FADT reserved value for pstate_cnt\n"));
 385         }
 386
 387         status = acpi_os_write_port(acpi_fadt.smi_cmd,
 388                                     (u32) acpi_fadt.pstate_cnt, 8);
 389         if (ACPI_FAILURE(status)) {
 390                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 391                                   "Failed to write pstate_cnt [0x%x] to "
 392                                   "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt,
 393                                   acpi_fadt.smi_cmd));
 394                 module_put(calling_module);
 395                 return_VALUE(status);
 396         }
 397
 398         /* Success. If there's no _PPC, we need to fear nothing, so
 399          * we can allow the cpufreq driver to be rmmod'ed. */
 400         is_done = 1;
 401
 402         if (!(acpi_processor_ppc_status & PPC_IN_USE))
 403                 module_put(calling_module);
 404
 405         return_VALUE(0);
 406 }
 407
 408 EXPORT_SYMBOL(acpi_processor_notify_smm);
 409
 410 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
 411 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
 412
 413 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
 414 static struct file_operations acpi_processor_perf_fops = {
 415         .open = acpi_processor_perf_open_fs,
 416         .read = seq_read,
 417         .llseek = seq_lseek,
 418         .release = single_release,
 419 };
 420
 421 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
 422 {
 423         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
 424         int i;
 425
 426         ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
 427
 428         if (!pr)
 429                 goto end;
 430
 431         if (!pr->performance) {
 432                 seq_puts(seq, "<not supported>\n");
 433                 goto end;
 434         }
 435
 436         seq_printf(seq, "state count:             %d\n"
 437                    "active state:            P%d\n",
 438                    pr->performance->state_count, pr->performance->state);
 439
 440         seq_puts(seq, "states:\n");
 441         for (i = 0; i < pr->performance->state_count; i++)
 442                 seq_printf(seq,
 443                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
 444                            (i == pr->performance->state ? '*' : ' '), i,
 445                            (u32) pr->performance->states[i].core_frequency,
 446                            (u32) pr->performance->states[i].power,
 447                            (u32) pr->performance->states[i].transition_latency);
 448
 449       end:
 450         return_VALUE(0);
 451 }
 452
 453 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
 454 {
 455         return single_open(file, acpi_processor_perf_seq_show,
 456                            PDE(inode)->data);
 457 }
 458
 459 static ssize_t
 460 acpi_processor_write_performance(struct file *file,
 461                                  const char __user * buffer,
 462                                  size_t count, loff_t * data)
 463 {
 464         int result = 0;
 465         struct seq_file *m = (struct seq_file *)file->private_data;
 466         struct acpi_processor *pr = (struct acpi_processor *)m->private;
 467         struct acpi_processor_performance *perf;
 468         char state_string[12] = { '\0' };
 469         unsigned int new_state = 0;
 470         struct cpufreq_policy policy;
 471
 472         ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
 473
 474         if (!pr || (count > sizeof(state_string) - 1))
 475                 return_VALUE(-EINVAL);
 476
 477         perf = pr->performance;
 478         if (!perf)
 479                 return_VALUE(-EINVAL);
 480
 481         if (copy_from_user(state_string, buffer, count))
 482                 return_VALUE(-EFAULT);
 483
 484         state_string[count] = '\0';
 485         new_state = simple_strtoul(state_string, NULL, 0);
 486
 487         if (new_state >= perf->state_count)
 488                 return_VALUE(-EINVAL);
 489
 490         cpufreq_get_policy(&policy, pr->id);
 491
 492         policy.cpu = pr->id;
 493         policy.min = perf->states[new_state].core_frequency * 1000;
 494         policy.max = perf->states[new_state].core_frequency * 1000;
 495
 496         result = cpufreq_set_policy(&policy);
 497         if (result)
 498                 return_VALUE(result);
 499
 500         return_VALUE(count);
 501 }
 502
 503 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 504 {
 505         struct proc_dir_entry *entry = NULL;
 506         struct acpi_device *device = NULL;
 507
 508         ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
 509
 510         if (acpi_bus_get_device(pr->handle, &device))
 511                 return_VOID;
 512
 513         /* add file 'performance' [R/W] */
 514         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 515                                   S_IFREG | S_IRUGO | S_IWUSR,
 516                                   acpi_device_dir(device));
 517         if (!entry)
 518                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 519                                   "Unable to create '%s' fs entry\n",
 520                                   ACPI_PROCESSOR_FILE_PERFORMANCE));
 521         else {
 522                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
 523                 entry->proc_fops = &acpi_processor_perf_fops;
 524                 entry->data = acpi_driver_data(device);
 525                 entry->owner = THIS_MODULE;
 526         }
 527         return_VOID;
 528 }
 529
 530 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 531 {
 532         struct acpi_device *device = NULL;
 533
 534         ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
 535
 536         if (acpi_bus_get_device(pr->handle, &device))
 537                 return_VOID;
 538
 539         /* remove file 'performance' */
 540         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
 541                           acpi_device_dir(device));
 542
 543         return_VOID;
 544 }
 545
 546 #else
 547 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
 548 {
 549         return;
 550 }
 551 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
 552 {
 553         return;
 554 }
 555 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
 556
 557 static int acpi_processor_get_psd(struct acpi_processor *pr)
 558 {
 559         int result = 0;
 560         acpi_status status = AE_OK;
 561         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 562         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
 563         struct acpi_buffer state = {0, NULL};
 564         union acpi_object  *psd = NULL;
 565         struct acpi_psd_package *pdomain;
 566
 567         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
 568         if (ACPI_FAILURE(status)) {
 569                 return -ENODEV;
 570         }
 571
 572         psd = (union acpi_object *) buffer.pointer;
 573         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
 574                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 575                 result = -EFAULT;
 576                 goto end;
 577         }
 578
 579         if (psd->package.count != 1) {
 580                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 581                 result = -EFAULT;
 582                 goto end;
 583         }
 584
 585         pdomain = &(pr->performance->domain_info);
 586
 587         state.length = sizeof(struct acpi_psd_package);
 588         state.pointer = pdomain;
 589
 590         status = acpi_extract_package(&(psd->package.elements[0]),
 591                 &format, &state);
 592         if (ACPI_FAILURE(status)) {
 593                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
 594                 result = -EFAULT;
 595                 goto end;
 596         }
 597
 598         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
 599                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
 600                 result = -EFAULT;
 601                 goto end;
 602         }
 603
 604         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
 605                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
 606                 result = -EFAULT;
 607                 goto end;
 608         }
 609
 610 end:
 611         acpi_os_free(buffer.pointer);
 612         return result;
 613 }
 614
 615 int acpi_processor_preregister_performance(
 616                 struct acpi_processor_performance **performance)
 617 {
 618         int count, count_target;
 619         int retval = 0;
 620         unsigned int i, j;
 621         cpumask_t covered_cpus;
 622         struct acpi_processor *pr;
 623         struct acpi_psd_package *pdomain;
 624         struct acpi_processor *match_pr;
 625         struct acpi_psd_package *match_pdomain;
 626
 627         mutex_lock(&performance_mutex);
 628
 629         retval = 0;
 630
 631         /* Call _PSD for all CPUs */
 632         for_each_possible_cpu(i) {
 633                 pr = processors[i];
 634                 if (!pr) {
 635                         /* Look only at processors in ACPI namespace */
 636                         continue;
 637                 }
 638
 639                 if (pr->performance) {
 640                         retval = -EBUSY;
 641                         continue;
 642                 }
 643
 644                 if (!performance || !performance[i]) {
 645                         retval = -EINVAL;
 646                         continue;
 647                 }
 648
 649                 pr->performance = performance[i];
 650                 cpu_set(i, pr->performance->shared_cpu_map);
 651                 if (acpi_processor_get_psd(pr)) {
 652                         retval = -EINVAL;
 653                         continue;
 654                 }
 655         }
 656         if (retval)
 657                 goto err_ret;
 658
 659         /*
 660          * Now that we have _PSD data from all CPUs, lets setup P-state
 661          * domain info.
 662          */
 663         for_each_possible_cpu(i) {
 664                 pr = processors[i];
 665                 if (!pr)
 666                         continue;
 667
 668                 /* Basic validity check for domain info */
 669                 pdomain = &(pr->performance->domain_info);
 670                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
 671                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
 672                         retval = -EINVAL;
 673                         goto err_ret;
 674                 }
 675                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
 676                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
 677                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
 678                         retval = -EINVAL;
 679                         goto err_ret;
 680                 }
 681         }
 682
 683         cpus_clear(covered_cpus);
 684         for_each_possible_cpu(i) {
 685                 pr = processors[i];
 686                 if (!pr)
 687                         continue;
 688
 689                 if (cpu_isset(i, covered_cpus))
 690                         continue;
 691
 692                 pdomain = &(pr->performance->domain_info);
 693                 cpu_set(i, pr->performance->shared_cpu_map);
 694                 cpu_set(i, covered_cpus);
 695                 if (pdomain->num_processors <= 1)
 696                         continue;
 697
 698                 /* Validate the Domain info */
 699                 count_target = pdomain->num_processors;
 700                 count = 1;
 701                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL ||
 702                     pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) {
 703                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 704                 } else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) {
 705                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 706                 }
 707
 708                 for_each_possible_cpu(j) {
 709                         if (i == j)
 710                                 continue;
 711
 712                         match_pr = processors[j];
 713                         if (!match_pr)
 714                                 continue;
 715
 716                         match_pdomain = &(match_pr->performance->domain_info);
 717                         if (match_pdomain->domain != pdomain->domain)
 718                                 continue;
 719
 720                         /* Here i and j are in the same domain */
 721
 722                         if (match_pdomain->num_processors != count_target) {
 723                                 retval = -EINVAL;
 724                                 goto err_ret;
 725                         }
 726
 727                         if (pdomain->coord_type != match_pdomain->coord_type) {
 728                                 retval = -EINVAL;
 729                                 goto err_ret;
 730                         }
 731
 732                         cpu_set(j, covered_cpus);
 733                         cpu_set(j, pr->performance->shared_cpu_map);
 734                         count++;
 735                 }
 736
 737                 for_each_possible_cpu(j) {
 738                         if (i == j)
 739                                 continue;
 740
 741                         match_pr = processors[j];
 742                         if (!match_pr)
 743                                 continue;
 744
 745                         match_pdomain = &(match_pr->performance->domain_info);
 746                         if (match_pdomain->domain != pdomain->domain)
 747                                 continue;
 748
 749                         match_pr->performance->shared_type =
 750                                         pr->performance->shared_type;
 751                         match_pr->performance->shared_cpu_map =
 752                                 pr->performance->shared_cpu_map;
 753                 }
 754         }
 755
 756 err_ret:
 757         if (retval) {
 758                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n"));
 759         }
 760
 761         for_each_possible_cpu(i) {
 762                 pr = processors[i];
 763                 if (!pr || !pr->performance)
 764                         continue;
 765
 766                 /* Assume no coordination on any error parsing domain info */
 767                 if (retval) {
 768                         cpus_clear(pr->performance->shared_cpu_map);
 769                         cpu_set(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         mutex_unlock(&performance_mutex);
 776         return retval;
 777 }
 778 EXPORT_SYMBOL(acpi_processor_preregister_performance);
 779
 780
 781 int
 782 acpi_processor_register_performance(struct acpi_processor_performance
 783                                     *performance, unsigned int cpu)
 784 {
 785         struct acpi_processor *pr;
 786
 787         ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
 788
 789         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
 790                 return_VALUE(-EINVAL);
 791
 792         mutex_lock(&performance_mutex);
 793
 794         pr = processors[cpu];
 795         if (!pr) {
 796                 mutex_unlock(&performance_mutex);
 797                 return_VALUE(-ENODEV);
 798         }
 799
 800         if (pr->performance) {
 801                 mutex_unlock(&performance_mutex);
 802                 return_VALUE(-EBUSY);
 803         }
 804
 805         WARN_ON(!performance);
 806
 807         pr->performance = performance;
 808
 809         if (acpi_processor_get_performance_info(pr)) {
 810                 pr->performance = NULL;
 811                 mutex_unlock(&performance_mutex);
 812                 return_VALUE(-EIO);
 813         }
 814
 815         acpi_cpufreq_add_file(pr);
 816
 817         mutex_unlock(&performance_mutex);
 818         return_VALUE(0);
 819 }
 820
 821 EXPORT_SYMBOL(acpi_processor_register_performance);
 822
 823 void
 824 acpi_processor_unregister_performance(struct acpi_processor_performance
 825                                       *performance, unsigned int cpu)
 826 {
 827         struct acpi_processor *pr;
 828
 829         ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
 830
 831         mutex_lock(&performance_mutex);
 832
 833         pr = processors[cpu];
 834         if (!pr) {
 835                 mutex_unlock(&performance_mutex);
 836                 return_VOID;
 837         }
 838
 839         if (pr->performance)
 840                 kfree(pr->performance->states);
 841         pr->performance = NULL;
 842
 843         acpi_cpufreq_remove_file(pr);
 844
 845         mutex_unlock(&performance_mutex);
 846
 847         return_VOID;
 848 }
 849
 850 EXPORT_SYMBOL(acpi_processor_unregister_performance);