drivers/acpi/processor_core.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   6  *  Copyright (C) 2004       Dominik Brodowski <[email protected]>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <[email protected]>
   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 #ifdef CONFIG_ACPI_PROCFS
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 #endif
  88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  91
  92
  93 static const struct acpi_device_id processor_device_ids[] = {
  94         {ACPI_PROCESSOR_OBJECT_HID, 0},
  95         {"ACPI0007", 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  99
 100 static struct acpi_driver acpi_processor_driver = {
 101         .name = "processor",
 102         .class = ACPI_PROCESSOR_CLASS,
 103         .ids = processor_device_ids,
 104         .ops = {
 105                 .add = acpi_processor_add,
 106                 .remove = acpi_processor_remove,
 107                 .suspend = acpi_processor_suspend,
 108                 .resume = acpi_processor_resume,
 109                 .notify = acpi_processor_notify,
 110                 },
 111 };
 112
 113 #define INSTALL_NOTIFY_HANDLER          1
 114 #define UNINSTALL_NOTIFY_HANDLER        2
 115 #ifdef CONFIG_ACPI_PROCFS
 116 static const struct file_operations acpi_processor_info_fops = {
 117         .owner = THIS_MODULE,
 118         .open = acpi_processor_info_open_fs,
 119         .read = seq_read,
 120         .llseek = seq_lseek,
 121         .release = single_release,
 122 };
 123 #endif
 124
 125 DEFINE_PER_CPU(struct acpi_processor *, processors);
 126 struct acpi_processor_errata errata __read_mostly;
 127 static int set_no_mwait(const struct dmi_system_id *id)
 128 {
 129         printk(KERN_NOTICE PREFIX "%s detected - "
 130                 "disabling mwait for CPU C-states\n", id->ident);
 131         idle_nomwait = 1;
 132         return 0;
 133 }
 134
 135 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 136         {
 137         set_no_mwait, "IFL91 board", {
 138         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 139         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 140         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 141         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 142         {
 143         set_no_mwait, "Extensa 5220", {
 144         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 145         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 146         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 147         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 148         {},
 149 };
 150
 151 /* --------------------------------------------------------------------------
 152                                 Errata Handling
 153    -------------------------------------------------------------------------- */
 154
 155 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 156 {
 157         u8 value1 = 0;
 158         u8 value2 = 0;
 159
 160
 161         if (!dev)
 162                 return -EINVAL;
 163
 164         /*
 165          * Note that 'dev' references the PIIX4 ACPI Controller.
 166          */
 167
 168         switch (dev->revision) {
 169         case 0:
 170                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 171                 break;
 172         case 1:
 173                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 174                 break;
 175         case 2:
 176                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 177                 break;
 178         case 3:
 179                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 180                 break;
 181         default:
 182                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 183                 break;
 184         }
 185
 186         switch (dev->revision) {
 187
 188         case 0:         /* PIIX4 A-step */
 189         case 1:         /* PIIX4 B-step */
 190                 /*
 191                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 192                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 193                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 194                  * 2002 PIIX4 specification update.  Applies to only older
 195                  * PIIX4 models.
 196                  */
 197                 errata.piix4.throttle = 1;
 198
 199         case 2:         /* PIIX4E */
 200         case 3:         /* PIIX4M */
 201                 /*
 202                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 203                  * Livelock") from the January 2002 PIIX4 specification update.
 204                  * Applies to all PIIX4 models.
 205                  */
 206
 207                 /*
 208                  * BM-IDE
 209                  * ------
 210                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 211                  * Status register address.  We'll use this later to read
 212                  * each IDE controller's DMA status to make sure we catch all
 213                  * DMA activity.
 214                  */
 215                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 216                                      PCI_DEVICE_ID_INTEL_82371AB,
 217                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 218                 if (dev) {
 219                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 220                         pci_dev_put(dev);
 221                 }
 222
 223                 /*
 224                  * Type-F DMA
 225                  * ----------
 226                  * Find the PIIX4 ISA Controller and read the Motherboard
 227                  * DMA controller's status to see if Type-F (Fast) DMA mode
 228                  * is enabled (bit 7) on either channel.  Note that we'll
 229                  * disable C3 support if this is enabled, as some legacy
 230                  * devices won't operate well if fast DMA is disabled.
 231                  */
 232                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 233                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 234                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 235                 if (dev) {
 236                         pci_read_config_byte(dev, 0x76, &value1);
 237                         pci_read_config_byte(dev, 0x77, &value2);
 238                         if ((value1 & 0x80) || (value2 & 0x80))
 239                                 errata.piix4.fdma = 1;
 240                         pci_dev_put(dev);
 241                 }
 242
 243                 break;
 244         }
 245
 246         if (errata.piix4.bmisx)
 247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 248                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 249         if (errata.piix4.fdma)
 250                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 251                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 252
 253         return 0;
 254 }
 255
 256 static int acpi_processor_errata(struct acpi_processor *pr)
 257 {
 258         int result = 0;
 259         struct pci_dev *dev = NULL;
 260
 261
 262         if (!pr)
 263                 return -EINVAL;
 264
 265         /*
 266          * PIIX4
 267          */
 268         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 269                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 270                              PCI_ANY_ID, NULL);
 271         if (dev) {
 272                 result = acpi_processor_errata_piix4(dev);
 273                 pci_dev_put(dev);
 274         }
 275
 276         return result;
 277 }
 278
 279 /* --------------------------------------------------------------------------
 280                               Common ACPI processor functions
 281    -------------------------------------------------------------------------- */
 282
 283 /*
 284  * _PDC is required for a BIOS-OS handshake for most of the newer
 285  * ACPI processor features.
 286  */
 287 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 288 {
 289         struct acpi_object_list *pdc_in = pr->pdc;
 290         acpi_status status = AE_OK;
 291
 292
 293         if (!pdc_in)
 294                 return status;
 295         if (idle_nomwait) {
 296                 /*
 297                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 298                  * mode will be disabled in the parameter of _PDC object.
 299                  * Of course C1_FFH access mode will also be disabled.
 300                  */
 301                 union acpi_object *obj;
 302                 u32 *buffer = NULL;
 303
 304                 obj = pdc_in->pointer;
 305                 buffer = (u32 *)(obj->buffer.pointer);
 306                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 307
 308         }
 309         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 310
 311         if (ACPI_FAILURE(status))
 312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 313                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 314
 315         return status;
 316 }
 317
 318 /* --------------------------------------------------------------------------
 319                               FS Interface (/proc)
 320    -------------------------------------------------------------------------- */
 321
 322 #ifdef CONFIG_ACPI_PROCFS
 323 static struct proc_dir_entry *acpi_processor_dir = NULL;
 324
 325 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 326 {
 327         struct acpi_processor *pr = seq->private;
 328
 329
 330         if (!pr)
 331                 goto end;
 332
 333         seq_printf(seq, "processor id:            %d\n"
 334                    "acpi id:                 %d\n"
 335                    "bus mastering control:   %s\n"
 336                    "power management:        %s\n"
 337                    "throttling control:      %s\n"
 338                    "limit interface:         %s\n",
 339                    pr->id,
 340                    pr->acpi_id,
 341                    pr->flags.bm_control ? "yes" : "no",
 342                    pr->flags.power ? "yes" : "no",
 343                    pr->flags.throttling ? "yes" : "no",
 344                    pr->flags.limit ? "yes" : "no");
 345
 346       end:
 347         return 0;
 348 }
 349
 350 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 351 {
 352         return single_open(file, acpi_processor_info_seq_show,
 353                            PDE(inode)->data);
 354 }
 355
 356 static int acpi_processor_add_fs(struct acpi_device *device)
 357 {
 358         struct proc_dir_entry *entry = NULL;
 359
 360
 361         if (!acpi_device_dir(device)) {
 362                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 363                                                      acpi_processor_dir);
 364                 if (!acpi_device_dir(device))
 365                         return -ENODEV;
 366         }
 367
 368         /* 'info' [R] */
 369         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 370                                  S_IRUGO, acpi_device_dir(device),
 371                                  &acpi_processor_info_fops,
 372                                  acpi_driver_data(device));
 373         if (!entry)
 374                 return -EIO;
 375
 376         /* 'throttling' [R/W] */
 377         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 378                                  S_IFREG | S_IRUGO | S_IWUSR,
 379                                  acpi_device_dir(device),
 380                                  &acpi_processor_throttling_fops,
 381                                  acpi_driver_data(device));
 382         if (!entry)
 383                 return -EIO;
 384
 385         /* 'limit' [R/W] */
 386         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 387                                  S_IFREG | S_IRUGO | S_IWUSR,
 388                                  acpi_device_dir(device),
 389                                  &acpi_processor_limit_fops,
 390                                  acpi_driver_data(device));
 391         if (!entry)
 392                 return -EIO;
 393         return 0;
 394 }
 395 static int acpi_processor_remove_fs(struct acpi_device *device)
 396 {
 397
 398         if (acpi_device_dir(device)) {
 399                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 400                                   acpi_device_dir(device));
 401                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 402                                   acpi_device_dir(device));
 403                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 404                                   acpi_device_dir(device));
 405                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 406                 acpi_device_dir(device) = NULL;
 407         }
 408
 409         return 0;
 410 }
 411 #else
 412 static inline int acpi_processor_add_fs(struct acpi_device *device)
 413 {
 414         return 0;
 415 }
 416 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 417 {
 418         return 0;
 419 }
 420 #endif
 421
 422 /* Use the acpiid in MADT to map cpus in case of SMP */
 423
 424 #ifndef CONFIG_SMP
 425 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 426 #else
 427
 428 static struct acpi_table_madt *madt;
 429
 430 static int map_lapic_id(struct acpi_subtable_header *entry,
 431                  u32 acpi_id, int *apic_id)
 432 {
 433         struct acpi_madt_local_apic *lapic =
 434                 (struct acpi_madt_local_apic *)entry;
 435         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 436             lapic->processor_id == acpi_id) {
 437                 *apic_id = lapic->id;
 438                 return 1;
 439         }
 440         return 0;
 441 }
 442
 443 static int map_x2apic_id(struct acpi_subtable_header *entry,
 444                          int device_declaration, u32 acpi_id, int *apic_id)
 445 {
 446         struct acpi_madt_local_x2apic *apic =
 447                 (struct acpi_madt_local_x2apic *)entry;
 448         u32 tmp = apic->local_apic_id;
 449
 450         /* Only check enabled APICs*/
 451         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 452                 return 0;
 453
 454         /* Device statement declaration type */
 455         if (device_declaration) {
 456                 if (apic->uid == acpi_id)
 457                         goto found;
 458         }
 459
 460         return 0;
 461 found:
 462         *apic_id = tmp;
 463         return 1;
 464 }
 465
 466 static int map_lsapic_id(struct acpi_subtable_header *entry,
 467                 int device_declaration, u32 acpi_id, int *apic_id)
 468 {
 469         struct acpi_madt_local_sapic *lsapic =
 470                 (struct acpi_madt_local_sapic *)entry;
 471         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 472
 473         /* Only check enabled APICs*/
 474         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 475                 return 0;
 476
 477         /* Device statement declaration type */
 478         if (device_declaration) {
 479                 if (entry->length < 16)
 480                         printk(KERN_ERR PREFIX
 481                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 482                             tmp);
 483                 else if (lsapic->uid == acpi_id)
 484                         goto found;
 485         /* Processor statement declaration type */
 486         } else if (lsapic->processor_id == acpi_id)
 487                 goto found;
 488
 489         return 0;
 490 found:
 491         *apic_id = tmp;
 492         return 1;
 493 }
 494
 495 static int map_madt_entry(int type, u32 acpi_id)
 496 {
 497         unsigned long madt_end, entry;
 498         int apic_id = -1;
 499
 500         if (!madt)
 501                 return apic_id;
 502
 503         entry = (unsigned long)madt;
 504         madt_end = entry + madt->header.length;
 505
 506         /* Parse all entries looking for a match. */
 507
 508         entry += sizeof(struct acpi_table_madt);
 509         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 510                 struct acpi_subtable_header *header =
 511                         (struct acpi_subtable_header *)entry;
 512                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 513                         if (map_lapic_id(header, acpi_id, &apic_id))
 514                                 break;
 515                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 516                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 517                                 break;
 518                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 519                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 520                                 break;
 521                 }
 522                 entry += header->length;
 523         }
 524         return apic_id;
 525 }
 526
 527 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 528 {
 529         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 530         union acpi_object *obj;
 531         struct acpi_subtable_header *header;
 532         int apic_id = -1;
 533
 534         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 535                 goto exit;
 536
 537         if (!buffer.length || !buffer.pointer)
 538                 goto exit;
 539
 540         obj = buffer.pointer;
 541         if (obj->type != ACPI_TYPE_BUFFER ||
 542             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 543                 goto exit;
 544         }
 545
 546         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 547         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 548                 map_lapic_id(header, acpi_id, &apic_id);
 549         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 550                 map_lsapic_id(header, type, acpi_id, &apic_id);
 551         }
 552
 553 exit:
 554         if (buffer.pointer)
 555                 kfree(buffer.pointer);
 556         return apic_id;
 557 }
 558
 559 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 560 {
 561         int i;
 562         int apic_id = -1;
 563
 564         apic_id = map_mat_entry(handle, type, acpi_id);
 565         if (apic_id == -1)
 566                 apic_id = map_madt_entry(type, acpi_id);
 567         if (apic_id == -1)
 568                 return apic_id;
 569
 570         for_each_possible_cpu(i) {
 571                 if (cpu_physical_id(i) == apic_id)
 572                         return i;
 573         }
 574         return -1;
 575 }
 576 #endif
 577
 578 /* --------------------------------------------------------------------------
 579                                  Driver Interface
 580    -------------------------------------------------------------------------- */
 581
 582 static int acpi_processor_get_info(struct acpi_device *device)
 583 {
 584         acpi_status status = 0;
 585         union acpi_object object = { 0 };
 586         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 587         struct acpi_processor *pr;
 588         int cpu_index, device_declaration = 0;
 589         static int cpu0_initialized;
 590
 591         pr = acpi_driver_data(device);
 592         if (!pr)
 593                 return -EINVAL;
 594
 595         if (num_online_cpus() > 1)
 596                 errata.smp = TRUE;
 597
 598         acpi_processor_errata(pr);
 599
 600         /*
 601          * Check to see if we have bus mastering arbitration control.  This
 602          * is required for proper C3 usage (to maintain cache coherency).
 603          */
 604         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 605                 pr->flags.bm_control = 1;
 606                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 607                                   "Bus mastering arbitration control present\n"));
 608         } else
 609                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 610                                   "No bus mastering arbitration control\n"));
 611
 612         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 613                 /* Declared with "Processor" statement; match ProcessorID */
 614                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 615                 if (ACPI_FAILURE(status)) {
 616                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 617                         return -ENODEV;
 618                 }
 619
 620                 /*
 621                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 622                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 623                  *      arch/xxx/acpi.c
 624                  */
 625                 pr->acpi_id = object.processor.proc_id;
 626         } else {
 627                 /*
 628                  * Declared with "Device" statement; match _UID.
 629                  * Note that we don't handle string _UIDs yet.
 630                  */
 631                 unsigned long long value;
 632                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 633                                                 NULL, &value);
 634                 if (ACPI_FAILURE(status)) {
 635                         printk(KERN_ERR PREFIX
 636                             "Evaluating processor _UID [%#x]\n", status);
 637                         return -ENODEV;
 638                 }
 639                 device_declaration = 1;
 640                 pr->acpi_id = value;
 641         }
 642         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 643
 644         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 645         if (!cpu0_initialized && (cpu_index == -1) &&
 646             (num_online_cpus() == 1)) {
 647                 cpu_index = 0;
 648         }
 649
 650         cpu0_initialized = 1;
 651
 652         pr->id = cpu_index;
 653
 654         /*
 655          *  Extra Processor objects may be enumerated on MP systems with
 656          *  less than the max # of CPUs. They should be ignored _iff
 657          *  they are physically not present.
 658          */
 659         if (pr->id == -1) {
 660                 if (ACPI_FAILURE
 661                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 662                         return -ENODEV;
 663                 }
 664         }
 665         /*
 666          * On some boxes several processors use the same processor bus id.
 667          * But they are located in different scope. For example:
 668          * \_SB.SCK0.CPU0
 669          * \_SB.SCK1.CPU0
 670          * Rename the processor device bus id. And the new bus id will be
 671          * generated as the following format:
 672          * CPU+CPU ID.
 673          */
 674         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 675         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 676                           pr->acpi_id));
 677
 678         if (!object.processor.pblk_address)
 679                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 680         else if (object.processor.pblk_length != 6)
 681                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 682                             object.processor.pblk_length);
 683         else {
 684                 pr->throttling.address = object.processor.pblk_address;
 685                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 686                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 687
 688                 pr->pblk = object.processor.pblk_address;
 689
 690                 /*
 691                  * We don't care about error returns - we just try to mark
 692                  * these reserved so that nobody else is confused into thinking
 693                  * that this region might be unused..
 694                  *
 695                  * (In particular, allocating the IO range for Cardbus)
 696                  */
 697                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 698         }
 699
 700         /*
 701          * If ACPI describes a slot number for this CPU, we can use it
 702          * ensure we get the right value in the "physical id" field
 703          * of /proc/cpuinfo
 704          */
 705         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 706         if (ACPI_SUCCESS(status))
 707                 arch_fix_phys_package_id(pr->id, object.integer.value);
 708
 709         return 0;
 710 }
 711
 712 static DEFINE_PER_CPU(void *, processor_device_array);
 713
 714 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 715 {
 716         struct acpi_processor *pr = acpi_driver_data(device);
 717         int saved;
 718
 719         if (!pr)
 720                 return;
 721
 722         switch (event) {
 723         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 724                 saved = pr->performance_platform_limit;
 725                 acpi_processor_ppc_has_changed(pr);
 726                 if (saved == pr->performance_platform_limit)
 727                         break;
 728                 acpi_bus_generate_proc_event(device, event,
 729                                         pr->performance_platform_limit);
 730                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 731                                                   dev_name(&device->dev), event,
 732                                                   pr->performance_platform_limit);
 733                 break;
 734         case ACPI_PROCESSOR_NOTIFY_POWER:
 735                 acpi_processor_cst_has_changed(pr);
 736                 acpi_bus_generate_proc_event(device, event, 0);
 737                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 738                                                   dev_name(&device->dev), event, 0);
 739                 break;
 740         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 741                 acpi_processor_tstate_has_changed(pr);
 742                 acpi_bus_generate_proc_event(device, event, 0);
 743                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 744                                                   dev_name(&device->dev), event, 0);
 745         default:
 746                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 747                                   "Unsupported event [0x%x]\n", event));
 748                 break;
 749         }
 750
 751         return;
 752 }
 753
 754 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 755                 unsigned long action, void *hcpu)
 756 {
 757         unsigned int cpu = (unsigned long)hcpu;
 758         struct acpi_processor *pr = per_cpu(processors, cpu);
 759
 760         if (action == CPU_ONLINE && pr) {
 761                 acpi_processor_ppc_has_changed(pr);
 762                 acpi_processor_cst_has_changed(pr);
 763                 acpi_processor_tstate_has_changed(pr);
 764         }
 765         return NOTIFY_OK;
 766 }
 767
 768 static struct notifier_block acpi_cpu_notifier =
 769 {
 770             .notifier_call = acpi_cpu_soft_notify,
 771 };
 772
 773 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 774 {
 775         struct acpi_processor *pr = NULL;
 776         int result = 0;
 777         struct sys_device *sysdev;
 778
 779         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 780         if (!pr)
 781                 return -ENOMEM;
 782
 783         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 784                 kfree(pr);
 785                 return -ENOMEM;
 786         }
 787
 788         pr->handle = device->handle;
 789         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 790         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 791         device->driver_data = pr;
 792
 793         result = acpi_processor_get_info(device);
 794         if (result) {
 795                 /* Processor is physically not present */
 796                 return 0;
 797         }
 798
 799         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 800
 801         /*
 802          * Buggy BIOS check
 803          * ACPI id of processors can be reported wrongly by the BIOS.
 804          * Don't trust it blindly
 805          */
 806         if (per_cpu(processor_device_array, pr->id) != NULL &&
 807             per_cpu(processor_device_array, pr->id) != device) {
 808                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 809                         "for the processor\n");
 810                 result = -ENODEV;
 811                 goto err_free_cpumask;
 812         }
 813         per_cpu(processor_device_array, pr->id) = device;
 814
 815         per_cpu(processors, pr->id) = pr;
 816
 817         result = acpi_processor_add_fs(device);
 818         if (result)
 819                 goto err_free_cpumask;
 820
 821         sysdev = get_cpu_sysdev(pr->id);
 822         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 823                 result = -EFAULT;
 824                 goto err_remove_fs;
 825         }
 826
 827         /* _PDC call should be done before doing anything else (if reqd.). */
 828         arch_acpi_processor_init_pdc(pr);
 829         acpi_processor_set_pdc(pr);
 830         arch_acpi_processor_cleanup_pdc(pr);
 831
 832 #ifdef CONFIG_CPU_FREQ
 833         acpi_processor_ppc_has_changed(pr);
 834 #endif
 835         acpi_processor_get_throttling_info(pr);
 836         acpi_processor_get_limit_info(pr);
 837
 838
 839         acpi_processor_power_init(pr, device);
 840
 841         pr->cdev = thermal_cooling_device_register("Processor", device,
 842                                                 &processor_cooling_ops);
 843         if (IS_ERR(pr->cdev)) {
 844                 result = PTR_ERR(pr->cdev);
 845                 goto err_power_exit;
 846         }
 847
 848         dev_info(&device->dev, "registered as cooling_device%d\n",
 849                  pr->cdev->id);
 850
 851         result = sysfs_create_link(&device->dev.kobj,
 852                                    &pr->cdev->device.kobj,
 853                                    "thermal_cooling");
 854         if (result) {
 855                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 856                 goto err_thermal_unregister;
 857         }
 858         result = sysfs_create_link(&pr->cdev->device.kobj,
 859                                    &device->dev.kobj,
 860                                    "device");
 861         if (result) {
 862                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 863                 goto err_remove_sysfs;
 864         }
 865
 866         return 0;
 867
 868 err_remove_sysfs:
 869         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 870 err_thermal_unregister:
 871         thermal_cooling_device_unregister(pr->cdev);
 872 err_power_exit:
 873         acpi_processor_power_exit(pr, device);
 874 err_remove_fs:
 875         acpi_processor_remove_fs(device);
 876 err_free_cpumask:
 877         free_cpumask_var(pr->throttling.shared_cpu_map);
 878
 879         return result;
 880 }
 881
 882 static int acpi_processor_remove(struct acpi_device *device, int type)
 883 {
 884         struct acpi_processor *pr = NULL;
 885
 886
 887         if (!device || !acpi_driver_data(device))
 888                 return -EINVAL;
 889
 890         pr = acpi_driver_data(device);
 891
 892         if (pr->id >= nr_cpu_ids)
 893                 goto free;
 894
 895         if (type == ACPI_BUS_REMOVAL_EJECT) {
 896                 if (acpi_processor_handle_eject(pr))
 897                         return -EINVAL;
 898         }
 899
 900         acpi_processor_power_exit(pr, device);
 901
 902         sysfs_remove_link(&device->dev.kobj, "sysdev");
 903
 904         acpi_processor_remove_fs(device);
 905
 906         if (pr->cdev) {
 907                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 908                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 909                 thermal_cooling_device_unregister(pr->cdev);
 910                 pr->cdev = NULL;
 911         }
 912
 913         per_cpu(processors, pr->id) = NULL;
 914         per_cpu(processor_device_array, pr->id) = NULL;
 915
 916 free:
 917         free_cpumask_var(pr->throttling.shared_cpu_map);
 918         kfree(pr);
 919
 920         return 0;
 921 }
 922
 923 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 924 /****************************************************************************
 925  *      Acpi processor hotplug support                                      *
 926  ****************************************************************************/
 927
 928 static int is_processor_present(acpi_handle handle)
 929 {
 930         acpi_status status;
 931         unsigned long long sta = 0;
 932
 933
 934         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 935
 936         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 937                 return 1;
 938
 939         /*
 940          * _STA is mandatory for a processor that supports hot plug
 941          */
 942         if (status == AE_NOT_FOUND)
 943                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 944                                 "Processor does not support hot plug\n"));
 945         else
 946                 ACPI_EXCEPTION((AE_INFO, status,
 947                                 "Processor Device is not present"));
 948         return 0;
 949 }
 950
 951 static
 952 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 953 {
 954         acpi_handle phandle;
 955         struct acpi_device *pdev;
 956
 957
 958         if (acpi_get_parent(handle, &phandle)) {
 959                 return -ENODEV;
 960         }
 961
 962         if (acpi_bus_get_device(phandle, &pdev)) {
 963                 return -ENODEV;
 964         }
 965
 966         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 967                 return -ENODEV;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 974                                                 u32 event, void *data)
 975 {
 976         struct acpi_processor *pr;
 977         struct acpi_device *device = NULL;
 978         int result;
 979
 980
 981         switch (event) {
 982         case ACPI_NOTIFY_BUS_CHECK:
 983         case ACPI_NOTIFY_DEVICE_CHECK:
 984                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 985                 "Processor driver received %s event\n",
 986                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 987                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 988
 989                 if (!is_processor_present(handle))
 990                         break;
 991
 992                 if (acpi_bus_get_device(handle, &device)) {
 993                         result = acpi_processor_device_add(handle, &device);
 994                         if (result)
 995                                 printk(KERN_ERR PREFIX
 996                                             "Unable to add the device\n");
 997                         break;
 998                 }
 999                 break;
1000         case ACPI_NOTIFY_EJECT_REQUEST:
1001                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1002                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1003
1004                 if (acpi_bus_get_device(handle, &device)) {
1005                         printk(KERN_ERR PREFIX
1006                                     "Device don't exist, dropping EJECT\n");
1007                         break;
1008                 }
1009                 pr = acpi_driver_data(device);
1010                 if (!pr) {
1011                         printk(KERN_ERR PREFIX
1012                                     "Driver data is NULL, dropping EJECT\n");
1013                         return;
1014                 }
1015                 break;
1016         default:
1017                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1018                                   "Unsupported event [0x%x]\n", event));
1019                 break;
1020         }
1021
1022         return;
1023 }
1024
1025 static acpi_status
1026 processor_walk_namespace_cb(acpi_handle handle,
1027                             u32 lvl, void *context, void **rv)
1028 {
1029         acpi_status status;
1030         int *action = context;
1031         acpi_object_type type = 0;
1032
1033         status = acpi_get_type(handle, &type);
1034         if (ACPI_FAILURE(status))
1035                 return (AE_OK);
1036
1037         if (type != ACPI_TYPE_PROCESSOR)
1038                 return (AE_OK);
1039
1040         switch (*action) {
1041         case INSTALL_NOTIFY_HANDLER:
1042                 acpi_install_notify_handler(handle,
1043                                             ACPI_SYSTEM_NOTIFY,
1044                                             acpi_processor_hotplug_notify,
1045                                             NULL);
1046                 break;
1047         case UNINSTALL_NOTIFY_HANDLER:
1048                 acpi_remove_notify_handler(handle,
1049                                            ACPI_SYSTEM_NOTIFY,
1050                                            acpi_processor_hotplug_notify);
1051                 break;
1052         default:
1053                 break;
1054         }
1055
1056         return (AE_OK);
1057 }
1058
1059 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1060 {
1061
1062         if (!is_processor_present(handle)) {
1063                 return AE_ERROR;
1064         }
1065
1066         if (acpi_map_lsapic(handle, p_cpu))
1067                 return AE_ERROR;
1068
1069         if (arch_register_cpu(*p_cpu)) {
1070                 acpi_unmap_lsapic(*p_cpu);
1071                 return AE_ERROR;
1072         }
1073
1074         return AE_OK;
1075 }
1076
1077 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1078 {
1079         if (cpu_online(pr->id))
1080                 cpu_down(pr->id);
1081
1082         arch_unregister_cpu(pr->id);
1083         acpi_unmap_lsapic(pr->id);
1084         return (0);
1085 }
1086 #else
1087 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1088 {
1089         return AE_ERROR;
1090 }
1091 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1092 {
1093         return (-EINVAL);
1094 }
1095 #endif
1096
1097 static
1098 void acpi_processor_install_hotplug_notify(void)
1099 {
1100 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1101         int action = INSTALL_NOTIFY_HANDLER;
1102         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1103                             ACPI_ROOT_OBJECT,
1104                             ACPI_UINT32_MAX,
1105                             processor_walk_namespace_cb, &action, NULL);
1106 #endif
1107         register_hotcpu_notifier(&acpi_cpu_notifier);
1108 }
1109
1110 static
1111 void acpi_processor_uninstall_hotplug_notify(void)
1112 {
1113 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1114         int action = UNINSTALL_NOTIFY_HANDLER;
1115         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1116                             ACPI_ROOT_OBJECT,
1117                             ACPI_UINT32_MAX,
1118                             processor_walk_namespace_cb, &action, NULL);
1119 #endif
1120         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1121 }
1122
1123 /*
1124  * We keep the driver loaded even when ACPI is not running.
1125  * This is needed for the powernow-k8 driver, that works even without
1126  * ACPI, but needs symbols from this driver
1127  */
1128
1129 static int __init acpi_processor_init(void)
1130 {
1131         int result = 0;
1132
1133         if (acpi_disabled)
1134                 return 0;
1135
1136         memset(&errata, 0, sizeof(errata));
1137
1138 #ifdef CONFIG_SMP
1139         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1140                                 (struct acpi_table_header **)&madt)))
1141                 madt = NULL;
1142 #endif
1143 #ifdef CONFIG_ACPI_PROCFS
1144         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1145         if (!acpi_processor_dir)
1146                 return -ENOMEM;
1147 #endif
1148         /*
1149          * Check whether the system is DMI table. If yes, OSPM
1150          * should not use mwait for CPU-states.
1151          */
1152         dmi_check_system(processor_idle_dmi_table);
1153         result = cpuidle_register_driver(&acpi_idle_driver);
1154         if (result < 0)
1155                 goto out_proc;
1156
1157         result = acpi_bus_register_driver(&acpi_processor_driver);
1158         if (result < 0)
1159                 goto out_cpuidle;
1160
1161         acpi_processor_install_hotplug_notify();
1162
1163         acpi_thermal_cpufreq_init();
1164
1165         acpi_processor_ppc_init();
1166
1167         acpi_processor_throttling_init();
1168
1169         return 0;
1170
1171 out_cpuidle:
1172         cpuidle_unregister_driver(&acpi_idle_driver);
1173
1174 out_proc:
1175 #ifdef CONFIG_ACPI_PROCFS
1176         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1177 #endif
1178
1179         return result;
1180 }
1181
1182 static void __exit acpi_processor_exit(void)
1183 {
1184         if (acpi_disabled)
1185                 return;
1186
1187         acpi_processor_ppc_exit();
1188
1189         acpi_thermal_cpufreq_exit();
1190
1191         acpi_processor_uninstall_hotplug_notify();
1192
1193         acpi_bus_unregister_driver(&acpi_processor_driver);
1194
1195         cpuidle_unregister_driver(&acpi_idle_driver);
1196
1197 #ifdef CONFIG_ACPI_PROCFS
1198         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1199 #endif
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");