drivers/acpi/processor_core.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($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  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define PREFIX "ACPI: "
  63
  64 #define ACPI_PROCESSOR_CLASS            "processor"
  65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  66 #define ACPI_PROCESSOR_FILE_INFO        "info"
  67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  72
  73 #define ACPI_PROCESSOR_LIMIT_USER       0
  74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("processor_core");
  78
  79 MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION("ACPI Processor Driver");
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  86 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  89
  90
  91 static const struct acpi_device_id processor_device_ids[] = {
  92         {ACPI_PROCESSOR_OBJECT_HID, 0},
  93         {"ACPI0007", 0},
  94         {"", 0},
  95 };
  96 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  97
  98 static struct acpi_driver acpi_processor_driver = {
  99         .name = "processor",
 100         .class = ACPI_PROCESSOR_CLASS,
 101         .ids = processor_device_ids,
 102         .ops = {
 103                 .add = acpi_processor_add,
 104                 .remove = acpi_processor_remove,
 105                 .suspend = acpi_processor_suspend,
 106                 .resume = acpi_processor_resume,
 107                 .notify = acpi_processor_notify,
 108                 },
 109 };
 110
 111 #define INSTALL_NOTIFY_HANDLER          1
 112 #define UNINSTALL_NOTIFY_HANDLER        2
 113
 114 static const struct file_operations acpi_processor_info_fops = {
 115         .owner = THIS_MODULE,
 116         .open = acpi_processor_info_open_fs,
 117         .read = seq_read,
 118         .llseek = seq_lseek,
 119         .release = single_release,
 120 };
 121
 122 DEFINE_PER_CPU(struct acpi_processor *, processors);
 123 struct acpi_processor_errata errata __read_mostly;
 124 static int set_no_mwait(const struct dmi_system_id *id)
 125 {
 126         printk(KERN_NOTICE PREFIX "%s detected - "
 127                 "disabling mwait for CPU C-states\n", id->ident);
 128         idle_nomwait = 1;
 129         return 0;
 130 }
 131
 132 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 133         {
 134         set_no_mwait, "IFL91 board", {
 135         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 136         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 137         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 138         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 139         {
 140         set_no_mwait, "Extensa 5220", {
 141         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 142         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 143         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 144         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 145         {},
 146 };
 147
 148 /* --------------------------------------------------------------------------
 149                                 Errata Handling
 150    -------------------------------------------------------------------------- */
 151
 152 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 153 {
 154         u8 value1 = 0;
 155         u8 value2 = 0;
 156
 157
 158         if (!dev)
 159                 return -EINVAL;
 160
 161         /*
 162          * Note that 'dev' references the PIIX4 ACPI Controller.
 163          */
 164
 165         switch (dev->revision) {
 166         case 0:
 167                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 168                 break;
 169         case 1:
 170                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 171                 break;
 172         case 2:
 173                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 174                 break;
 175         case 3:
 176                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 177                 break;
 178         default:
 179                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 180                 break;
 181         }
 182
 183         switch (dev->revision) {
 184
 185         case 0:         /* PIIX4 A-step */
 186         case 1:         /* PIIX4 B-step */
 187                 /*
 188                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 189                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 190                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 191                  * 2002 PIIX4 specification update.  Applies to only older
 192                  * PIIX4 models.
 193                  */
 194                 errata.piix4.throttle = 1;
 195
 196         case 2:         /* PIIX4E */
 197         case 3:         /* PIIX4M */
 198                 /*
 199                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 200                  * Livelock") from the January 2002 PIIX4 specification update.
 201                  * Applies to all PIIX4 models.
 202                  */
 203
 204                 /*
 205                  * BM-IDE
 206                  * ------
 207                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 208                  * Status register address.  We'll use this later to read
 209                  * each IDE controller's DMA status to make sure we catch all
 210                  * DMA activity.
 211                  */
 212                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 213                                      PCI_DEVICE_ID_INTEL_82371AB,
 214                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 215                 if (dev) {
 216                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 217                         pci_dev_put(dev);
 218                 }
 219
 220                 /*
 221                  * Type-F DMA
 222                  * ----------
 223                  * Find the PIIX4 ISA Controller and read the Motherboard
 224                  * DMA controller's status to see if Type-F (Fast) DMA mode
 225                  * is enabled (bit 7) on either channel.  Note that we'll
 226                  * disable C3 support if this is enabled, as some legacy
 227                  * devices won't operate well if fast DMA is disabled.
 228                  */
 229                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 230                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 231                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 232                 if (dev) {
 233                         pci_read_config_byte(dev, 0x76, &value1);
 234                         pci_read_config_byte(dev, 0x77, &value2);
 235                         if ((value1 & 0x80) || (value2 & 0x80))
 236                                 errata.piix4.fdma = 1;
 237                         pci_dev_put(dev);
 238                 }
 239
 240                 break;
 241         }
 242
 243         if (errata.piix4.bmisx)
 244                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 245                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 246         if (errata.piix4.fdma)
 247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 248                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 249
 250         return 0;
 251 }
 252
 253 static int acpi_processor_errata(struct acpi_processor *pr)
 254 {
 255         int result = 0;
 256         struct pci_dev *dev = NULL;
 257
 258
 259         if (!pr)
 260                 return -EINVAL;
 261
 262         /*
 263          * PIIX4
 264          */
 265         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 266                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 267                              PCI_ANY_ID, NULL);
 268         if (dev) {
 269                 result = acpi_processor_errata_piix4(dev);
 270                 pci_dev_put(dev);
 271         }
 272
 273         return result;
 274 }
 275
 276 /* --------------------------------------------------------------------------
 277                               Common ACPI processor functions
 278    -------------------------------------------------------------------------- */
 279
 280 /*
 281  * _PDC is required for a BIOS-OS handshake for most of the newer
 282  * ACPI processor features.
 283  */
 284 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 285 {
 286         struct acpi_object_list *pdc_in = pr->pdc;
 287         acpi_status status = AE_OK;
 288
 289
 290         if (!pdc_in)
 291                 return status;
 292         if (idle_nomwait) {
 293                 /*
 294                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 295                  * mode will be disabled in the parameter of _PDC object.
 296                  * Of course C1_FFH access mode will also be disabled.
 297                  */
 298                 union acpi_object *obj;
 299                 u32 *buffer = NULL;
 300
 301                 obj = pdc_in->pointer;
 302                 buffer = (u32 *)(obj->buffer.pointer);
 303                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 304
 305         }
 306         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 307
 308         if (ACPI_FAILURE(status))
 309                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 310                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 311
 312         return status;
 313 }
 314
 315 /* --------------------------------------------------------------------------
 316                               FS Interface (/proc)
 317    -------------------------------------------------------------------------- */
 318
 319 static struct proc_dir_entry *acpi_processor_dir = NULL;
 320
 321 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 322 {
 323         struct acpi_processor *pr = seq->private;
 324
 325
 326         if (!pr)
 327                 goto end;
 328
 329         seq_printf(seq, "processor id:            %d\n"
 330                    "acpi id:                 %d\n"
 331                    "bus mastering control:   %s\n"
 332                    "power management:        %s\n"
 333                    "throttling control:      %s\n"
 334                    "limit interface:         %s\n",
 335                    pr->id,
 336                    pr->acpi_id,
 337                    pr->flags.bm_control ? "yes" : "no",
 338                    pr->flags.power ? "yes" : "no",
 339                    pr->flags.throttling ? "yes" : "no",
 340                    pr->flags.limit ? "yes" : "no");
 341
 342       end:
 343         return 0;
 344 }
 345
 346 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 347 {
 348         return single_open(file, acpi_processor_info_seq_show,
 349                            PDE(inode)->data);
 350 }
 351
 352 static int acpi_processor_add_fs(struct acpi_device *device)
 353 {
 354         struct proc_dir_entry *entry = NULL;
 355
 356
 357         if (!acpi_device_dir(device)) {
 358                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 359                                                      acpi_processor_dir);
 360                 if (!acpi_device_dir(device))
 361                         return -ENODEV;
 362         }
 363
 364         /* 'info' [R] */
 365         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 366                                  S_IRUGO, acpi_device_dir(device),
 367                                  &acpi_processor_info_fops,
 368                                  acpi_driver_data(device));
 369         if (!entry)
 370                 return -EIO;
 371
 372         /* 'throttling' [R/W] */
 373         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 374                                  S_IFREG | S_IRUGO | S_IWUSR,
 375                                  acpi_device_dir(device),
 376                                  &acpi_processor_throttling_fops,
 377                                  acpi_driver_data(device));
 378         if (!entry)
 379                 return -EIO;
 380
 381         /* 'limit' [R/W] */
 382         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 383                                  S_IFREG | S_IRUGO | S_IWUSR,
 384                                  acpi_device_dir(device),
 385                                  &acpi_processor_limit_fops,
 386                                  acpi_driver_data(device));
 387         if (!entry)
 388                 return -EIO;
 389         return 0;
 390 }
 391
 392 static int acpi_processor_remove_fs(struct acpi_device *device)
 393 {
 394
 395         if (acpi_device_dir(device)) {
 396                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 397                                   acpi_device_dir(device));
 398                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 399                                   acpi_device_dir(device));
 400                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 401                                   acpi_device_dir(device));
 402                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 403                 acpi_device_dir(device) = NULL;
 404         }
 405
 406         return 0;
 407 }
 408
 409 /* Use the acpiid in MADT to map cpus in case of SMP */
 410
 411 #ifndef CONFIG_SMP
 412 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 413 #else
 414
 415 static struct acpi_table_madt *madt;
 416
 417 static int map_lapic_id(struct acpi_subtable_header *entry,
 418                  u32 acpi_id, int *apic_id)
 419 {
 420         struct acpi_madt_local_apic *lapic =
 421                 (struct acpi_madt_local_apic *)entry;
 422         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 423             lapic->processor_id == acpi_id) {
 424                 *apic_id = lapic->id;
 425                 return 1;
 426         }
 427         return 0;
 428 }
 429
 430 static int map_x2apic_id(struct acpi_subtable_header *entry,
 431                          int device_declaration, u32 acpi_id, int *apic_id)
 432 {
 433         struct acpi_madt_local_x2apic *apic =
 434                 (struct acpi_madt_local_x2apic *)entry;
 435         u32 tmp = apic->local_apic_id;
 436
 437         /* Only check enabled APICs*/
 438         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 439                 return 0;
 440
 441         /* Device statement declaration type */
 442         if (device_declaration) {
 443                 if (apic->uid == acpi_id)
 444                         goto found;
 445         }
 446
 447         return 0;
 448 found:
 449         *apic_id = tmp;
 450         return 1;
 451 }
 452
 453 static int map_lsapic_id(struct acpi_subtable_header *entry,
 454                 int device_declaration, u32 acpi_id, int *apic_id)
 455 {
 456         struct acpi_madt_local_sapic *lsapic =
 457                 (struct acpi_madt_local_sapic *)entry;
 458         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 459
 460         /* Only check enabled APICs*/
 461         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 462                 return 0;
 463
 464         /* Device statement declaration type */
 465         if (device_declaration) {
 466                 if (entry->length < 16)
 467                         printk(KERN_ERR PREFIX
 468                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 469                             tmp);
 470                 else if (lsapic->uid == acpi_id)
 471                         goto found;
 472         /* Processor statement declaration type */
 473         } else if (lsapic->processor_id == acpi_id)
 474                 goto found;
 475
 476         return 0;
 477 found:
 478         *apic_id = tmp;
 479         return 1;
 480 }
 481
 482 static int map_madt_entry(int type, u32 acpi_id)
 483 {
 484         unsigned long madt_end, entry;
 485         int apic_id = -1;
 486
 487         if (!madt)
 488                 return apic_id;
 489
 490         entry = (unsigned long)madt;
 491         madt_end = entry + madt->header.length;
 492
 493         /* Parse all entries looking for a match. */
 494
 495         entry += sizeof(struct acpi_table_madt);
 496         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 497                 struct acpi_subtable_header *header =
 498                         (struct acpi_subtable_header *)entry;
 499                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 500                         if (map_lapic_id(header, acpi_id, &apic_id))
 501                                 break;
 502                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 503                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 504                                 break;
 505                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 506                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 507                                 break;
 508                 }
 509                 entry += header->length;
 510         }
 511         return apic_id;
 512 }
 513
 514 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 515 {
 516         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 517         union acpi_object *obj;
 518         struct acpi_subtable_header *header;
 519         int apic_id = -1;
 520
 521         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 522                 goto exit;
 523
 524         if (!buffer.length || !buffer.pointer)
 525                 goto exit;
 526
 527         obj = buffer.pointer;
 528         if (obj->type != ACPI_TYPE_BUFFER ||
 529             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 530                 goto exit;
 531         }
 532
 533         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 534         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 535                 map_lapic_id(header, acpi_id, &apic_id);
 536         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 537                 map_lsapic_id(header, type, acpi_id, &apic_id);
 538         }
 539
 540 exit:
 541         if (buffer.pointer)
 542                 kfree(buffer.pointer);
 543         return apic_id;
 544 }
 545
 546 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 547 {
 548         int i;
 549         int apic_id = -1;
 550
 551         apic_id = map_mat_entry(handle, type, acpi_id);
 552         if (apic_id == -1)
 553                 apic_id = map_madt_entry(type, acpi_id);
 554         if (apic_id == -1)
 555                 return apic_id;
 556
 557         for_each_possible_cpu(i) {
 558                 if (cpu_physical_id(i) == apic_id)
 559                         return i;
 560         }
 561         return -1;
 562 }
 563 #endif
 564
 565 /* --------------------------------------------------------------------------
 566                                  Driver Interface
 567    -------------------------------------------------------------------------- */
 568
 569 static int acpi_processor_get_info(struct acpi_device *device)
 570 {
 571         acpi_status status = 0;
 572         union acpi_object object = { 0 };
 573         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 574         struct acpi_processor *pr;
 575         int cpu_index, device_declaration = 0;
 576         static int cpu0_initialized;
 577
 578         pr = acpi_driver_data(device);
 579         if (!pr)
 580                 return -EINVAL;
 581
 582         if (num_online_cpus() > 1)
 583                 errata.smp = TRUE;
 584
 585         acpi_processor_errata(pr);
 586
 587         /*
 588          * Check to see if we have bus mastering arbitration control.  This
 589          * is required for proper C3 usage (to maintain cache coherency).
 590          */
 591         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 592                 pr->flags.bm_control = 1;
 593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 594                                   "Bus mastering arbitration control present\n"));
 595         } else
 596                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 597                                   "No bus mastering arbitration control\n"));
 598
 599         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 600                 /* Declared with "Processor" statement; match ProcessorID */
 601                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 602                 if (ACPI_FAILURE(status)) {
 603                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 604                         return -ENODEV;
 605                 }
 606
 607                 /*
 608                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 609                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 610                  *      arch/xxx/acpi.c
 611                  */
 612                 pr->acpi_id = object.processor.proc_id;
 613         } else {
 614                 /*
 615                  * Declared with "Device" statement; match _UID.
 616                  * Note that we don't handle string _UIDs yet.
 617                  */
 618                 unsigned long long value;
 619                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 620                                                 NULL, &value);
 621                 if (ACPI_FAILURE(status)) {
 622                         printk(KERN_ERR PREFIX
 623                             "Evaluating processor _UID [%#x]\n", status);
 624                         return -ENODEV;
 625                 }
 626                 device_declaration = 1;
 627                 pr->acpi_id = value;
 628         }
 629         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 630
 631         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 632         if (!cpu0_initialized && (cpu_index == -1) &&
 633             (num_online_cpus() == 1)) {
 634                 cpu_index = 0;
 635         }
 636
 637         cpu0_initialized = 1;
 638
 639         pr->id = cpu_index;
 640
 641         /*
 642          *  Extra Processor objects may be enumerated on MP systems with
 643          *  less than the max # of CPUs. They should be ignored _iff
 644          *  they are physically not present.
 645          */
 646         if (pr->id == -1) {
 647                 if (ACPI_FAILURE
 648                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 649                         return -ENODEV;
 650                 }
 651         }
 652         /*
 653          * On some boxes several processors use the same processor bus id.
 654          * But they are located in different scope. For example:
 655          * \_SB.SCK0.CPU0
 656          * \_SB.SCK1.CPU0
 657          * Rename the processor device bus id. And the new bus id will be
 658          * generated as the following format:
 659          * CPU+CPU ID.
 660          */
 661         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 662         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 663                           pr->acpi_id));
 664
 665         if (!object.processor.pblk_address)
 666                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 667         else if (object.processor.pblk_length != 6)
 668                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 669                             object.processor.pblk_length);
 670         else {
 671                 pr->throttling.address = object.processor.pblk_address;
 672                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 673                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 674
 675                 pr->pblk = object.processor.pblk_address;
 676
 677                 /*
 678                  * We don't care about error returns - we just try to mark
 679                  * these reserved so that nobody else is confused into thinking
 680                  * that this region might be unused..
 681                  *
 682                  * (In particular, allocating the IO range for Cardbus)
 683                  */
 684                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 685         }
 686
 687         /*
 688          * If ACPI describes a slot number for this CPU, we can use it
 689          * ensure we get the right value in the "physical id" field
 690          * of /proc/cpuinfo
 691          */
 692         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 693         if (ACPI_SUCCESS(status))
 694                 arch_fix_phys_package_id(pr->id, object.integer.value);
 695
 696         return 0;
 697 }
 698
 699 static DEFINE_PER_CPU(void *, processor_device_array);
 700
 701 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 702 {
 703         struct acpi_processor *pr = acpi_driver_data(device);
 704         int saved;
 705
 706         if (!pr)
 707                 return;
 708
 709         switch (event) {
 710         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 711                 saved = pr->performance_platform_limit;
 712                 acpi_processor_ppc_has_changed(pr);
 713                 if (saved == pr->performance_platform_limit)
 714                         break;
 715                 acpi_bus_generate_proc_event(device, event,
 716                                         pr->performance_platform_limit);
 717                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 718                                                   dev_name(&device->dev), event,
 719                                                   pr->performance_platform_limit);
 720                 break;
 721         case ACPI_PROCESSOR_NOTIFY_POWER:
 722                 acpi_processor_cst_has_changed(pr);
 723                 acpi_bus_generate_proc_event(device, event, 0);
 724                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 725                                                   dev_name(&device->dev), event, 0);
 726                 break;
 727         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 728                 acpi_processor_tstate_has_changed(pr);
 729                 acpi_bus_generate_proc_event(device, event, 0);
 730                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 731                                                   dev_name(&device->dev), event, 0);
 732         default:
 733                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 734                                   "Unsupported event [0x%x]\n", event));
 735                 break;
 736         }
 737
 738         return;
 739 }
 740
 741 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 742                 unsigned long action, void *hcpu)
 743 {
 744         unsigned int cpu = (unsigned long)hcpu;
 745         struct acpi_processor *pr = per_cpu(processors, cpu);
 746
 747         if (action == CPU_ONLINE && pr) {
 748                 acpi_processor_ppc_has_changed(pr);
 749                 acpi_processor_cst_has_changed(pr);
 750                 acpi_processor_tstate_has_changed(pr);
 751         }
 752         return NOTIFY_OK;
 753 }
 754
 755 static struct notifier_block acpi_cpu_notifier =
 756 {
 757             .notifier_call = acpi_cpu_soft_notify,
 758 };
 759
 760 static int acpi_processor_add(struct acpi_device *device)
 761 {
 762         struct acpi_processor *pr = NULL;
 763         int result = 0;
 764         struct sys_device *sysdev;
 765
 766         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 767         if (!pr)
 768                 return -ENOMEM;
 769
 770         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 771                 kfree(pr);
 772                 return -ENOMEM;
 773         }
 774
 775         pr->handle = device->handle;
 776         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 777         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 778         device->driver_data = pr;
 779
 780         result = acpi_processor_get_info(device);
 781         if (result) {
 782                 /* Processor is physically not present */
 783                 return 0;
 784         }
 785
 786         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 787
 788         /*
 789          * Buggy BIOS check
 790          * ACPI id of processors can be reported wrongly by the BIOS.
 791          * Don't trust it blindly
 792          */
 793         if (per_cpu(processor_device_array, pr->id) != NULL &&
 794             per_cpu(processor_device_array, pr->id) != device) {
 795                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 796                         "for the processor\n");
 797                 result = -ENODEV;
 798                 goto err_free_cpumask;
 799         }
 800         per_cpu(processor_device_array, pr->id) = device;
 801
 802         per_cpu(processors, pr->id) = pr;
 803
 804         result = acpi_processor_add_fs(device);
 805         if (result)
 806                 goto err_free_cpumask;
 807
 808         sysdev = get_cpu_sysdev(pr->id);
 809         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 810                 result = -EFAULT;
 811                 goto err_remove_fs;
 812         }
 813
 814         /* _PDC call should be done before doing anything else (if reqd.). */
 815         arch_acpi_processor_init_pdc(pr);
 816         acpi_processor_set_pdc(pr);
 817         arch_acpi_processor_cleanup_pdc(pr);
 818
 819 #ifdef CONFIG_CPU_FREQ
 820         acpi_processor_ppc_has_changed(pr);
 821 #endif
 822         acpi_processor_get_throttling_info(pr);
 823         acpi_processor_get_limit_info(pr);
 824
 825
 826         acpi_processor_power_init(pr, device);
 827
 828         pr->cdev = thermal_cooling_device_register("Processor", device,
 829                                                 &processor_cooling_ops);
 830         if (IS_ERR(pr->cdev)) {
 831                 result = PTR_ERR(pr->cdev);
 832                 goto err_power_exit;
 833         }
 834
 835         dev_info(&device->dev, "registered as cooling_device%d\n",
 836                  pr->cdev->id);
 837
 838         result = sysfs_create_link(&device->dev.kobj,
 839                                    &pr->cdev->device.kobj,
 840                                    "thermal_cooling");
 841         if (result) {
 842                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 843                 goto err_thermal_unregister;
 844         }
 845         result = sysfs_create_link(&pr->cdev->device.kobj,
 846                                    &device->dev.kobj,
 847                                    "device");
 848         if (result) {
 849                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 850                 goto err_remove_sysfs;
 851         }
 852
 853         if (pr->flags.throttling) {
 854                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 855                        acpi_device_name(device), acpi_device_bid(device));
 856                 printk(" %d throttling states", pr->throttling.state_count);
 857                 printk(")\n");
 858         }
 859
 860         return 0;
 861
 862 err_remove_sysfs:
 863         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 864 err_thermal_unregister:
 865         thermal_cooling_device_unregister(pr->cdev);
 866 err_power_exit:
 867         acpi_processor_power_exit(pr, device);
 868 err_remove_fs:
 869         acpi_processor_remove_fs(device);
 870 err_free_cpumask:
 871         free_cpumask_var(pr->throttling.shared_cpu_map);
 872
 873         return result;
 874 }
 875
 876 static int acpi_processor_remove(struct acpi_device *device, int type)
 877 {
 878         struct acpi_processor *pr = NULL;
 879
 880
 881         if (!device || !acpi_driver_data(device))
 882                 return -EINVAL;
 883
 884         pr = acpi_driver_data(device);
 885
 886         if (pr->id >= nr_cpu_ids)
 887                 goto free;
 888
 889         if (type == ACPI_BUS_REMOVAL_EJECT) {
 890                 if (acpi_processor_handle_eject(pr))
 891                         return -EINVAL;
 892         }
 893
 894         acpi_processor_power_exit(pr, device);
 895
 896         sysfs_remove_link(&device->dev.kobj, "sysdev");
 897
 898         acpi_processor_remove_fs(device);
 899
 900         if (pr->cdev) {
 901                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 902                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 903                 thermal_cooling_device_unregister(pr->cdev);
 904                 pr->cdev = NULL;
 905         }
 906
 907         per_cpu(processors, pr->id) = NULL;
 908         per_cpu(processor_device_array, pr->id) = NULL;
 909
 910 free:
 911         free_cpumask_var(pr->throttling.shared_cpu_map);
 912         kfree(pr);
 913
 914         return 0;
 915 }
 916
 917 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 918 /****************************************************************************
 919  *      Acpi processor hotplug support                                      *
 920  ****************************************************************************/
 921
 922 static int is_processor_present(acpi_handle handle)
 923 {
 924         acpi_status status;
 925         unsigned long long sta = 0;
 926
 927
 928         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 929
 930         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 931                 return 1;
 932
 933         /*
 934          * _STA is mandatory for a processor that supports hot plug
 935          */
 936         if (status == AE_NOT_FOUND)
 937                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 938                                 "Processor does not support hot plug\n"));
 939         else
 940                 ACPI_EXCEPTION((AE_INFO, status,
 941                                 "Processor Device is not present"));
 942         return 0;
 943 }
 944
 945 static
 946 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 947 {
 948         acpi_handle phandle;
 949         struct acpi_device *pdev;
 950
 951
 952         if (acpi_get_parent(handle, &phandle)) {
 953                 return -ENODEV;
 954         }
 955
 956         if (acpi_bus_get_device(phandle, &pdev)) {
 957                 return -ENODEV;
 958         }
 959
 960         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 961                 return -ENODEV;
 962         }
 963
 964         return 0;
 965 }
 966
 967 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 968                                                 u32 event, void *data)
 969 {
 970         struct acpi_processor *pr;
 971         struct acpi_device *device = NULL;
 972         int result;
 973
 974
 975         switch (event) {
 976         case ACPI_NOTIFY_BUS_CHECK:
 977         case ACPI_NOTIFY_DEVICE_CHECK:
 978                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 979                 "Processor driver received %s event\n",
 980                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 981                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 982
 983                 if (!is_processor_present(handle))
 984                         break;
 985
 986                 if (acpi_bus_get_device(handle, &device)) {
 987                         result = acpi_processor_device_add(handle, &device);
 988                         if (result)
 989                                 printk(KERN_ERR PREFIX
 990                                             "Unable to add the device\n");
 991                         break;
 992                 }
 993                 break;
 994         case ACPI_NOTIFY_EJECT_REQUEST:
 995                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 996                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 997
 998                 if (acpi_bus_get_device(handle, &device)) {
 999                         printk(KERN_ERR PREFIX
1000                                     "Device don't exist, dropping EJECT\n");
1001                         break;
1002                 }
1003                 pr = acpi_driver_data(device);
1004                 if (!pr) {
1005                         printk(KERN_ERR PREFIX
1006                                     "Driver data is NULL, dropping EJECT\n");
1007                         return;
1008                 }
1009                 break;
1010         default:
1011                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1012                                   "Unsupported event [0x%x]\n", event));
1013                 break;
1014         }
1015
1016         return;
1017 }
1018
1019 static acpi_status
1020 processor_walk_namespace_cb(acpi_handle handle,
1021                             u32 lvl, void *context, void **rv)
1022 {
1023         acpi_status status;
1024         int *action = context;
1025         acpi_object_type type = 0;
1026
1027         status = acpi_get_type(handle, &type);
1028         if (ACPI_FAILURE(status))
1029                 return (AE_OK);
1030
1031         if (type != ACPI_TYPE_PROCESSOR)
1032                 return (AE_OK);
1033
1034         switch (*action) {
1035         case INSTALL_NOTIFY_HANDLER:
1036                 acpi_install_notify_handler(handle,
1037                                             ACPI_SYSTEM_NOTIFY,
1038                                             acpi_processor_hotplug_notify,
1039                                             NULL);
1040                 break;
1041         case UNINSTALL_NOTIFY_HANDLER:
1042                 acpi_remove_notify_handler(handle,
1043                                            ACPI_SYSTEM_NOTIFY,
1044                                            acpi_processor_hotplug_notify);
1045                 break;
1046         default:
1047                 break;
1048         }
1049
1050         return (AE_OK);
1051 }
1052
1053 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1054 {
1055
1056         if (!is_processor_present(handle)) {
1057                 return AE_ERROR;
1058         }
1059
1060         if (acpi_map_lsapic(handle, p_cpu))
1061                 return AE_ERROR;
1062
1063         if (arch_register_cpu(*p_cpu)) {
1064                 acpi_unmap_lsapic(*p_cpu);
1065                 return AE_ERROR;
1066         }
1067
1068         return AE_OK;
1069 }
1070
1071 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1072 {
1073         if (cpu_online(pr->id))
1074                 cpu_down(pr->id);
1075
1076         arch_unregister_cpu(pr->id);
1077         acpi_unmap_lsapic(pr->id);
1078         return (0);
1079 }
1080 #else
1081 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1082 {
1083         return AE_ERROR;
1084 }
1085 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1086 {
1087         return (-EINVAL);
1088 }
1089 #endif
1090
1091 static
1092 void acpi_processor_install_hotplug_notify(void)
1093 {
1094 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1095         int action = INSTALL_NOTIFY_HANDLER;
1096         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1097                             ACPI_ROOT_OBJECT,
1098                             ACPI_UINT32_MAX,
1099                             processor_walk_namespace_cb, &action, NULL);
1100 #endif
1101         register_hotcpu_notifier(&acpi_cpu_notifier);
1102 }
1103
1104 static
1105 void acpi_processor_uninstall_hotplug_notify(void)
1106 {
1107 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1108         int action = UNINSTALL_NOTIFY_HANDLER;
1109         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1110                             ACPI_ROOT_OBJECT,
1111                             ACPI_UINT32_MAX,
1112                             processor_walk_namespace_cb, &action, NULL);
1113 #endif
1114         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1115 }
1116
1117 /*
1118  * We keep the driver loaded even when ACPI is not running.
1119  * This is needed for the powernow-k8 driver, that works even without
1120  * ACPI, but needs symbols from this driver
1121  */
1122
1123 static int __init acpi_processor_init(void)
1124 {
1125         int result = 0;
1126
1127         if (acpi_disabled)
1128                 return 0;
1129
1130         memset(&errata, 0, sizeof(errata));
1131
1132 #ifdef CONFIG_SMP
1133         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1134                                 (struct acpi_table_header **)&madt)))
1135                 madt = NULL;
1136 #endif
1137
1138         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1139         if (!acpi_processor_dir)
1140                 return -ENOMEM;
1141
1142         /*
1143          * Check whether the system is DMI table. If yes, OSPM
1144          * should not use mwait for CPU-states.
1145          */
1146         dmi_check_system(processor_idle_dmi_table);
1147         result = cpuidle_register_driver(&acpi_idle_driver);
1148         if (result < 0)
1149                 goto out_proc;
1150
1151         result = acpi_bus_register_driver(&acpi_processor_driver);
1152         if (result < 0)
1153                 goto out_cpuidle;
1154
1155         acpi_processor_install_hotplug_notify();
1156
1157         acpi_thermal_cpufreq_init();
1158
1159         acpi_processor_ppc_init();
1160
1161         acpi_processor_throttling_init();
1162
1163         return 0;
1164
1165 out_cpuidle:
1166         cpuidle_unregister_driver(&acpi_idle_driver);
1167
1168 out_proc:
1169         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1170
1171         return result;
1172 }
1173
1174 static void __exit acpi_processor_exit(void)
1175 {
1176         if (acpi_disabled)
1177                 return;
1178
1179         acpi_processor_ppc_exit();
1180
1181         acpi_thermal_cpufreq_exit();
1182
1183         acpi_processor_uninstall_hotplug_notify();
1184
1185         acpi_bus_unregister_driver(&acpi_processor_driver);
1186
1187         cpuidle_unregister_driver(&acpi_idle_driver);
1188
1189         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1190
1191         return;
1192 }
1193
1194 module_init(acpi_processor_init);
1195 module_exit(acpi_processor_exit);
1196
1197 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1198
1199 MODULE_ALIAS("processor");