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   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 ACPI_PROCESSOR_CLASS            "processor"
  63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  64 #define ACPI_PROCESSOR_FILE_INFO        "info"
  65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  70
  71 #define ACPI_PROCESSOR_LIMIT_USER       0
  72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  73
  74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  75 ACPI_MODULE_NAME("processor_core");
  76
  77 MODULE_AUTHOR("Paul Diefenbaugh");
  78 MODULE_DESCRIPTION("ACPI Processor Driver");
  79 MODULE_LICENSE("GPL");
  80
  81 static int acpi_processor_add(struct acpi_device *device);
  82 static int acpi_processor_start(struct acpi_device *device);
  83 static int acpi_processor_remove(struct acpi_device *device, int type);
  84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  85 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  88
  89
  90 static const struct acpi_device_id processor_device_ids[] = {
  91         {ACPI_PROCESSOR_OBJECT_HID, 0},
  92         {ACPI_PROCESSOR_HID, 0},
  93         {"", 0},
  94 };
  95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  96
  97 static struct acpi_driver acpi_processor_driver = {
  98         .name = "processor",
  99         .class = ACPI_PROCESSOR_CLASS,
 100         .ids = processor_device_ids,
 101         .ops = {
 102                 .add = acpi_processor_add,
 103                 .remove = acpi_processor_remove,
 104                 .start = acpi_processor_start,
 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_HID)) {
 600                 /*
 601                  * Declared with "Device" statement; match _UID.
 602                  * Note that we don't handle string _UIDs yet.
 603                  */
 604                 unsigned long long value;
 605                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 606                                                 NULL, &value);
 607                 if (ACPI_FAILURE(status)) {
 608                         printk(KERN_ERR PREFIX
 609                             "Evaluating processor _UID [%#x]\n", status);
 610                         return -ENODEV;
 611                 }
 612                 device_declaration = 1;
 613                 pr->acpi_id = value;
 614         } else {
 615                 /* Declared with "Processor" statement; match ProcessorID */
 616                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 617                 if (ACPI_FAILURE(status)) {
 618                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 619                         return -ENODEV;
 620                 }
 621
 622                 /*
 623                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 624                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 625                  *      arch/xxx/acpi.c
 626                  */
 627                 pr->acpi_id = object.processor.proc_id;
 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         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 654                           pr->acpi_id));
 655
 656         if (!object.processor.pblk_address)
 657                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 658         else if (object.processor.pblk_length != 6)
 659                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 660                             object.processor.pblk_length);
 661         else {
 662                 pr->throttling.address = object.processor.pblk_address;
 663                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 664                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 665
 666                 pr->pblk = object.processor.pblk_address;
 667
 668                 /*
 669                  * We don't care about error returns - we just try to mark
 670                  * these reserved so that nobody else is confused into thinking
 671                  * that this region might be unused..
 672                  *
 673                  * (In particular, allocating the IO range for Cardbus)
 674                  */
 675                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 676         }
 677
 678         /*
 679          * If ACPI describes a slot number for this CPU, we can use it
 680          * ensure we get the right value in the "physical id" field
 681          * of /proc/cpuinfo
 682          */
 683         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 684         if (ACPI_SUCCESS(status))
 685                 arch_fix_phys_package_id(pr->id, object.integer.value);
 686
 687         return 0;
 688 }
 689
 690 static DEFINE_PER_CPU(void *, processor_device_array);
 691
 692 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 693 {
 694         int result = 0;
 695         struct acpi_processor *pr;
 696         struct sys_device *sysdev;
 697
 698         pr = acpi_driver_data(device);
 699
 700         result = acpi_processor_get_info(device);
 701         if (result) {
 702                 /* Processor is physically not present */
 703                 return 0;
 704         }
 705
 706         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 707
 708         /*
 709          * Buggy BIOS check
 710          * ACPI id of processors can be reported wrongly by the BIOS.
 711          * Don't trust it blindly
 712          */
 713         if (per_cpu(processor_device_array, pr->id) != NULL &&
 714             per_cpu(processor_device_array, pr->id) != device) {
 715                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 716                         "for the processor\n");
 717                 return -ENODEV;
 718         }
 719         per_cpu(processor_device_array, pr->id) = device;
 720
 721         per_cpu(processors, pr->id) = pr;
 722
 723         result = acpi_processor_add_fs(device);
 724         if (result)
 725                 goto end;
 726
 727         sysdev = get_cpu_sysdev(pr->id);
 728         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 729                 return -EFAULT;
 730
 731         /* _PDC call should be done before doing anything else (if reqd.). */
 732         arch_acpi_processor_init_pdc(pr);
 733         acpi_processor_set_pdc(pr);
 734 #ifdef CONFIG_CPU_FREQ
 735         acpi_processor_ppc_has_changed(pr);
 736 #endif
 737         acpi_processor_get_throttling_info(pr);
 738         acpi_processor_get_limit_info(pr);
 739
 740
 741         acpi_processor_power_init(pr, device);
 742
 743         pr->cdev = thermal_cooling_device_register("Processor", device,
 744                                                 &processor_cooling_ops);
 745         if (IS_ERR(pr->cdev)) {
 746                 result = PTR_ERR(pr->cdev);
 747                 goto end;
 748         }
 749
 750         dev_info(&device->dev, "registered as cooling_device%d\n",
 751                  pr->cdev->id);
 752
 753         result = sysfs_create_link(&device->dev.kobj,
 754                                    &pr->cdev->device.kobj,
 755                                    "thermal_cooling");
 756         if (result)
 757                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 758         result = sysfs_create_link(&pr->cdev->device.kobj,
 759                                    &device->dev.kobj,
 760                                    "device");
 761         if (result)
 762                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 763
 764         if (pr->flags.throttling) {
 765                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 766                        acpi_device_name(device), acpi_device_bid(device));
 767                 printk(" %d throttling states", pr->throttling.state_count);
 768                 printk(")\n");
 769         }
 770
 771       end:
 772
 773         return result;
 774 }
 775
 776 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 777 {
 778         struct acpi_processor *pr = acpi_driver_data(device);
 779         int saved;
 780
 781         if (!pr)
 782                 return;
 783
 784         switch (event) {
 785         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 786                 saved = pr->performance_platform_limit;
 787                 acpi_processor_ppc_has_changed(pr);
 788                 if (saved == pr->performance_platform_limit)
 789                         break;
 790                 acpi_bus_generate_proc_event(device, event,
 791                                         pr->performance_platform_limit);
 792                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 793                                                   dev_name(&device->dev), event,
 794                                                   pr->performance_platform_limit);
 795                 break;
 796         case ACPI_PROCESSOR_NOTIFY_POWER:
 797                 acpi_processor_cst_has_changed(pr);
 798                 acpi_bus_generate_proc_event(device, event, 0);
 799                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 800                                                   dev_name(&device->dev), event, 0);
 801                 break;
 802         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 803                 acpi_processor_tstate_has_changed(pr);
 804                 acpi_bus_generate_proc_event(device, event, 0);
 805                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 806                                                   dev_name(&device->dev), event, 0);
 807         default:
 808                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 809                                   "Unsupported event [0x%x]\n", event));
 810                 break;
 811         }
 812
 813         return;
 814 }
 815
 816 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 817                 unsigned long action, void *hcpu)
 818 {
 819         unsigned int cpu = (unsigned long)hcpu;
 820         struct acpi_processor *pr = per_cpu(processors, cpu);
 821
 822         if (action == CPU_ONLINE && pr) {
 823                 acpi_processor_ppc_has_changed(pr);
 824                 acpi_processor_cst_has_changed(pr);
 825                 acpi_processor_tstate_has_changed(pr);
 826         }
 827         return NOTIFY_OK;
 828 }
 829
 830 static struct notifier_block acpi_cpu_notifier =
 831 {
 832             .notifier_call = acpi_cpu_soft_notify,
 833 };
 834
 835 static int acpi_processor_add(struct acpi_device *device)
 836 {
 837         struct acpi_processor *pr = NULL;
 838
 839
 840         if (!device)
 841                 return -EINVAL;
 842
 843         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 844         if (!pr)
 845                 return -ENOMEM;
 846
 847         if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 848                 kfree(pr);
 849                 return -ENOMEM;
 850         }
 851
 852         pr->handle = device->handle;
 853         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 854         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 855         device->driver_data = pr;
 856
 857         return 0;
 858 }
 859
 860 static int acpi_processor_remove(struct acpi_device *device, int type)
 861 {
 862         struct acpi_processor *pr = NULL;
 863
 864
 865         if (!device || !acpi_driver_data(device))
 866                 return -EINVAL;
 867
 868         pr = acpi_driver_data(device);
 869
 870         if (pr->id >= nr_cpu_ids)
 871                 goto free;
 872
 873         if (type == ACPI_BUS_REMOVAL_EJECT) {
 874                 if (acpi_processor_handle_eject(pr))
 875                         return -EINVAL;
 876         }
 877
 878         acpi_processor_power_exit(pr, device);
 879
 880         sysfs_remove_link(&device->dev.kobj, "sysdev");
 881
 882         acpi_processor_remove_fs(device);
 883
 884         if (pr->cdev) {
 885                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 886                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 887                 thermal_cooling_device_unregister(pr->cdev);
 888                 pr->cdev = NULL;
 889         }
 890
 891         per_cpu(processors, pr->id) = NULL;
 892         per_cpu(processor_device_array, pr->id) = NULL;
 893
 894 free:
 895         free_cpumask_var(pr->throttling.shared_cpu_map);
 896         kfree(pr);
 897
 898         return 0;
 899 }
 900
 901 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 902 /****************************************************************************
 903  *      Acpi processor hotplug support                                      *
 904  ****************************************************************************/
 905
 906 static int is_processor_present(acpi_handle handle)
 907 {
 908         acpi_status status;
 909         unsigned long long sta = 0;
 910
 911
 912         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 913
 914         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 915                 return 1;
 916
 917         /*
 918          * _STA is mandatory for a processor that supports hot plug
 919          */
 920         if (status == AE_NOT_FOUND)
 921                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 922                                 "Processor does not support hot plug\n"));
 923         else
 924                 ACPI_EXCEPTION((AE_INFO, status,
 925                                 "Processor Device is not present"));
 926         return 0;
 927 }
 928
 929 static
 930 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 931 {
 932         acpi_handle phandle;
 933         struct acpi_device *pdev;
 934         struct acpi_processor *pr;
 935
 936
 937         if (acpi_get_parent(handle, &phandle)) {
 938                 return -ENODEV;
 939         }
 940
 941         if (acpi_bus_get_device(phandle, &pdev)) {
 942                 return -ENODEV;
 943         }
 944
 945         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 946                 return -ENODEV;
 947         }
 948
 949         acpi_bus_start(*device);
 950
 951         pr = acpi_driver_data(*device);
 952         if (!pr)
 953                 return -ENODEV;
 954
 955         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 956                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 957         }
 958         return 0;
 959 }
 960
 961 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 962                                                 u32 event, void *data)
 963 {
 964         struct acpi_processor *pr;
 965         struct acpi_device *device = NULL;
 966         int result;
 967
 968
 969         switch (event) {
 970         case ACPI_NOTIFY_BUS_CHECK:
 971         case ACPI_NOTIFY_DEVICE_CHECK:
 972                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 973                 "Processor driver received %s event\n",
 974                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 975                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 976
 977                 if (!is_processor_present(handle))
 978                         break;
 979
 980                 if (acpi_bus_get_device(handle, &device)) {
 981                         result = acpi_processor_device_add(handle, &device);
 982                         if (result)
 983                                 printk(KERN_ERR PREFIX
 984                                             "Unable to add the device\n");
 985                         break;
 986                 }
 987
 988                 pr = acpi_driver_data(device);
 989                 if (!pr) {
 990                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 991                         break;
 992                 }
 993
 994                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 995                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 996                         break;
 997                 }
 998
 999                 result = acpi_processor_start(device);
1000                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
1001                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
1002                 } else {
1003                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
1004                                     acpi_device_bid(device));
1005                 }
1006                 break;
1007         case ACPI_NOTIFY_EJECT_REQUEST:
1008                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1009                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1010
1011                 if (acpi_bus_get_device(handle, &device)) {
1012                         printk(KERN_ERR PREFIX
1013                                     "Device don't exist, dropping EJECT\n");
1014                         break;
1015                 }
1016                 pr = acpi_driver_data(device);
1017                 if (!pr) {
1018                         printk(KERN_ERR PREFIX
1019                                     "Driver data is NULL, dropping EJECT\n");
1020                         return;
1021                 }
1022
1023                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1024                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1025                 break;
1026         default:
1027                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1028                                   "Unsupported event [0x%x]\n", event));
1029                 break;
1030         }
1031
1032         return;
1033 }
1034
1035 static acpi_status
1036 processor_walk_namespace_cb(acpi_handle handle,
1037                             u32 lvl, void *context, void **rv)
1038 {
1039         acpi_status status;
1040         int *action = context;
1041         acpi_object_type type = 0;
1042
1043         status = acpi_get_type(handle, &type);
1044         if (ACPI_FAILURE(status))
1045                 return (AE_OK);
1046
1047         if (type != ACPI_TYPE_PROCESSOR)
1048                 return (AE_OK);
1049
1050         switch (*action) {
1051         case INSTALL_NOTIFY_HANDLER:
1052                 acpi_install_notify_handler(handle,
1053                                             ACPI_SYSTEM_NOTIFY,
1054                                             acpi_processor_hotplug_notify,
1055                                             NULL);
1056                 break;
1057         case UNINSTALL_NOTIFY_HANDLER:
1058                 acpi_remove_notify_handler(handle,
1059                                            ACPI_SYSTEM_NOTIFY,
1060                                            acpi_processor_hotplug_notify);
1061                 break;
1062         default:
1063                 break;
1064         }
1065
1066         return (AE_OK);
1067 }
1068
1069 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1070 {
1071
1072         if (!is_processor_present(handle)) {
1073                 return AE_ERROR;
1074         }
1075
1076         if (acpi_map_lsapic(handle, p_cpu))
1077                 return AE_ERROR;
1078
1079         if (arch_register_cpu(*p_cpu)) {
1080                 acpi_unmap_lsapic(*p_cpu);
1081                 return AE_ERROR;
1082         }
1083
1084         return AE_OK;
1085 }
1086
1087 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1088 {
1089         if (cpu_online(pr->id))
1090                 cpu_down(pr->id);
1091
1092         arch_unregister_cpu(pr->id);
1093         acpi_unmap_lsapic(pr->id);
1094         return (0);
1095 }
1096 #else
1097 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1098 {
1099         return AE_ERROR;
1100 }
1101 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1102 {
1103         return (-EINVAL);
1104 }
1105 #endif
1106
1107 static
1108 void acpi_processor_install_hotplug_notify(void)
1109 {
1110 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1111         int action = INSTALL_NOTIFY_HANDLER;
1112         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1113                             ACPI_ROOT_OBJECT,
1114                             ACPI_UINT32_MAX,
1115                             processor_walk_namespace_cb, &action, NULL);
1116 #endif
1117         register_hotcpu_notifier(&acpi_cpu_notifier);
1118 }
1119
1120 static
1121 void acpi_processor_uninstall_hotplug_notify(void)
1122 {
1123 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1124         int action = UNINSTALL_NOTIFY_HANDLER;
1125         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1126                             ACPI_ROOT_OBJECT,
1127                             ACPI_UINT32_MAX,
1128                             processor_walk_namespace_cb, &action, NULL);
1129 #endif
1130         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1131 }
1132
1133 /*
1134  * We keep the driver loaded even when ACPI is not running.
1135  * This is needed for the powernow-k8 driver, that works even without
1136  * ACPI, but needs symbols from this driver
1137  */
1138
1139 static int __init acpi_processor_init(void)
1140 {
1141         int result = 0;
1142
1143         memset(&errata, 0, sizeof(errata));
1144
1145 #ifdef CONFIG_SMP
1146         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1147                                 (struct acpi_table_header **)&madt)))
1148                 madt = NULL;
1149 #endif
1150
1151         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1152         if (!acpi_processor_dir)
1153                 return -ENOMEM;
1154
1155         /*
1156          * Check whether the system is DMI table. If yes, OSPM
1157          * should not use mwait for CPU-states.
1158          */
1159         dmi_check_system(processor_idle_dmi_table);
1160         result = cpuidle_register_driver(&acpi_idle_driver);
1161         if (result < 0)
1162                 goto out_proc;
1163
1164         result = acpi_bus_register_driver(&acpi_processor_driver);
1165         if (result < 0)
1166                 goto out_cpuidle;
1167
1168         acpi_processor_install_hotplug_notify();
1169
1170         acpi_thermal_cpufreq_init();
1171
1172         acpi_processor_ppc_init();
1173
1174         acpi_processor_throttling_init();
1175
1176         return 0;
1177
1178 out_cpuidle:
1179         cpuidle_unregister_driver(&acpi_idle_driver);
1180
1181 out_proc:
1182         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1183
1184         return result;
1185 }
1186
1187 static void __exit acpi_processor_exit(void)
1188 {
1189         acpi_processor_ppc_exit();
1190
1191         acpi_thermal_cpufreq_exit();
1192
1193         acpi_processor_uninstall_hotplug_notify();
1194
1195         acpi_bus_unregister_driver(&acpi_processor_driver);
1196
1197         cpuidle_unregister_driver(&acpi_idle_driver);
1198
1199         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1200
1201         return;
1202 }
1203
1204 module_init(acpi_processor_init);
1205 module_exit(acpi_processor_exit);
1206
1207 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1208
1209 MODULE_ALIAS("processor");