drivers/acpi/processor_core.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define 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(acpi_handle handle, u32 event, void *data);
  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                 },
 108 };
 109
 110 #define INSTALL_NOTIFY_HANDLER          1
 111 #define UNINSTALL_NOTIFY_HANDLER        2
 112
 113 static const struct file_operations acpi_processor_info_fops = {
 114         .owner = THIS_MODULE,
 115         .open = acpi_processor_info_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 DEFINE_PER_CPU(struct acpi_processor *, processors);
 122 struct acpi_processor_errata errata __read_mostly;
 123 static int set_no_mwait(const struct dmi_system_id *id)
 124 {
 125         printk(KERN_NOTICE PREFIX "%s detected - "
 126                 "disabling mwait for CPU C-states\n", id->ident);
 127         idle_nomwait = 1;
 128         return 0;
 129 }
 130
 131 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 132         {
 133         set_no_mwait, "IFL91 board", {
 134         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 135         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 136         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 137         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 138         {
 139         set_no_mwait, "Extensa 5220", {
 140         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 141         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 142         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 143         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 144         {},
 145 };
 146
 147 /* --------------------------------------------------------------------------
 148                                 Errata Handling
 149    -------------------------------------------------------------------------- */
 150
 151 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 152 {
 153         u8 value1 = 0;
 154         u8 value2 = 0;
 155
 156
 157         if (!dev)
 158                 return -EINVAL;
 159
 160         /*
 161          * Note that 'dev' references the PIIX4 ACPI Controller.
 162          */
 163
 164         switch (dev->revision) {
 165         case 0:
 166                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 167                 break;
 168         case 1:
 169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 170                 break;
 171         case 2:
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 173                 break;
 174         case 3:
 175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 176                 break;
 177         default:
 178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 179                 break;
 180         }
 181
 182         switch (dev->revision) {
 183
 184         case 0:         /* PIIX4 A-step */
 185         case 1:         /* PIIX4 B-step */
 186                 /*
 187                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 188                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 189                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 190                  * 2002 PIIX4 specification update.  Applies to only older
 191                  * PIIX4 models.
 192                  */
 193                 errata.piix4.throttle = 1;
 194
 195         case 2:         /* PIIX4E */
 196         case 3:         /* PIIX4M */
 197                 /*
 198                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 199                  * Livelock") from the January 2002 PIIX4 specification update.
 200                  * Applies to all PIIX4 models.
 201                  */
 202
 203                 /*
 204                  * BM-IDE
 205                  * ------
 206                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 207                  * Status register address.  We'll use this later to read
 208                  * each IDE controller's DMA status to make sure we catch all
 209                  * DMA activity.
 210                  */
 211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 212                                      PCI_DEVICE_ID_INTEL_82371AB,
 213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 214                 if (dev) {
 215                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 216                         pci_dev_put(dev);
 217                 }
 218
 219                 /*
 220                  * Type-F DMA
 221                  * ----------
 222                  * Find the PIIX4 ISA Controller and read the Motherboard
 223                  * DMA controller's status to see if Type-F (Fast) DMA mode
 224                  * is enabled (bit 7) on either channel.  Note that we'll
 225                  * disable C3 support if this is enabled, as some legacy
 226                  * devices won't operate well if fast DMA is disabled.
 227                  */
 228                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 229                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 230                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 231                 if (dev) {
 232                         pci_read_config_byte(dev, 0x76, &value1);
 233                         pci_read_config_byte(dev, 0x77, &value2);
 234                         if ((value1 & 0x80) || (value2 & 0x80))
 235                                 errata.piix4.fdma = 1;
 236                         pci_dev_put(dev);
 237                 }
 238
 239                 break;
 240         }
 241
 242         if (errata.piix4.bmisx)
 243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 244                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 245         if (errata.piix4.fdma)
 246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 247                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 248
 249         return 0;
 250 }
 251
 252 static int acpi_processor_errata(struct acpi_processor *pr)
 253 {
 254         int result = 0;
 255         struct pci_dev *dev = NULL;
 256
 257
 258         if (!pr)
 259                 return -EINVAL;
 260
 261         /*
 262          * PIIX4
 263          */
 264         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 265                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 266                              PCI_ANY_ID, NULL);
 267         if (dev) {
 268                 result = acpi_processor_errata_piix4(dev);
 269                 pci_dev_put(dev);
 270         }
 271
 272         return result;
 273 }
 274
 275 /* --------------------------------------------------------------------------
 276                               Common ACPI processor functions
 277    -------------------------------------------------------------------------- */
 278
 279 /*
 280  * _PDC is required for a BIOS-OS handshake for most of the newer
 281  * ACPI processor features.
 282  */
 283 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 284 {
 285         struct acpi_object_list *pdc_in = pr->pdc;
 286         acpi_status status = AE_OK;
 287
 288
 289         if (!pdc_in)
 290                 return status;
 291         if (idle_nomwait) {
 292                 /*
 293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 294                  * mode will be disabled in the parameter of _PDC object.
 295                  * Of course C1_FFH access mode will also be disabled.
 296                  */
 297                 union acpi_object *obj;
 298                 u32 *buffer = NULL;
 299
 300                 obj = pdc_in->pointer;
 301                 buffer = (u32 *)(obj->buffer.pointer);
 302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 303
 304         }
 305         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 306
 307         if (ACPI_FAILURE(status))
 308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 309                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 310
 311         return status;
 312 }
 313
 314 /* --------------------------------------------------------------------------
 315                               FS Interface (/proc)
 316    -------------------------------------------------------------------------- */
 317
 318 static struct proc_dir_entry *acpi_processor_dir = NULL;
 319
 320 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 321 {
 322         struct acpi_processor *pr = seq->private;
 323
 324
 325         if (!pr)
 326                 goto end;
 327
 328         seq_printf(seq, "processor id:            %d\n"
 329                    "acpi id:                 %d\n"
 330                    "bus mastering control:   %s\n"
 331                    "power management:        %s\n"
 332                    "throttling control:      %s\n"
 333                    "limit interface:         %s\n",
 334                    pr->id,
 335                    pr->acpi_id,
 336                    pr->flags.bm_control ? "yes" : "no",
 337                    pr->flags.power ? "yes" : "no",
 338                    pr->flags.throttling ? "yes" : "no",
 339                    pr->flags.limit ? "yes" : "no");
 340
 341       end:
 342         return 0;
 343 }
 344
 345 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 346 {
 347         return single_open(file, acpi_processor_info_seq_show,
 348                            PDE(inode)->data);
 349 }
 350
 351 static int acpi_processor_add_fs(struct acpi_device *device)
 352 {
 353         struct proc_dir_entry *entry = NULL;
 354
 355
 356         if (!acpi_device_dir(device)) {
 357                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 358                                                      acpi_processor_dir);
 359                 if (!acpi_device_dir(device))
 360                         return -ENODEV;
 361         }
 362
 363         /* 'info' [R] */
 364         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 365                                  S_IRUGO, acpi_device_dir(device),
 366                                  &acpi_processor_info_fops,
 367                                  acpi_driver_data(device));
 368         if (!entry)
 369                 return -EIO;
 370
 371         /* 'throttling' [R/W] */
 372         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 373                                  S_IFREG | S_IRUGO | S_IWUSR,
 374                                  acpi_device_dir(device),
 375                                  &acpi_processor_throttling_fops,
 376                                  acpi_driver_data(device));
 377         if (!entry)
 378                 return -EIO;
 379
 380         /* 'limit' [R/W] */
 381         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 382                                  S_IFREG | S_IRUGO | S_IWUSR,
 383                                  acpi_device_dir(device),
 384                                  &acpi_processor_limit_fops,
 385                                  acpi_driver_data(device));
 386         if (!entry)
 387                 return -EIO;
 388         return 0;
 389 }
 390
 391 static int acpi_processor_remove_fs(struct acpi_device *device)
 392 {
 393
 394         if (acpi_device_dir(device)) {
 395                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 396                                   acpi_device_dir(device));
 397                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 398                                   acpi_device_dir(device));
 399                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 400                                   acpi_device_dir(device));
 401                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 402                 acpi_device_dir(device) = NULL;
 403         }
 404
 405         return 0;
 406 }
 407
 408 /* Use the acpiid in MADT to map cpus in case of SMP */
 409
 410 #ifndef CONFIG_SMP
 411 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 412 #else
 413
 414 static struct acpi_table_madt *madt;
 415
 416 static int map_lapic_id(struct acpi_subtable_header *entry,
 417                  u32 acpi_id, int *apic_id)
 418 {
 419         struct acpi_madt_local_apic *lapic =
 420                 (struct acpi_madt_local_apic *)entry;
 421         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 422             lapic->processor_id == acpi_id) {
 423                 *apic_id = lapic->id;
 424                 return 1;
 425         }
 426         return 0;
 427 }
 428
 429 static int map_x2apic_id(struct acpi_subtable_header *entry,
 430                          int device_declaration, u32 acpi_id, int *apic_id)
 431 {
 432         struct acpi_madt_local_x2apic *apic =
 433                 (struct acpi_madt_local_x2apic *)entry;
 434         u32 tmp = apic->local_apic_id;
 435
 436         /* Only check enabled APICs*/
 437         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 438                 return 0;
 439
 440         /* Device statement declaration type */
 441         if (device_declaration) {
 442                 if (apic->uid == acpi_id)
 443                         goto found;
 444         }
 445
 446         return 0;
 447 found:
 448         *apic_id = tmp;
 449         return 1;
 450 }
 451
 452 static int map_lsapic_id(struct acpi_subtable_header *entry,
 453                 int device_declaration, u32 acpi_id, int *apic_id)
 454 {
 455         struct acpi_madt_local_sapic *lsapic =
 456                 (struct acpi_madt_local_sapic *)entry;
 457         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 458
 459         /* Only check enabled APICs*/
 460         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 461                 return 0;
 462
 463         /* Device statement declaration type */
 464         if (device_declaration) {
 465                 if (entry->length < 16)
 466                         printk(KERN_ERR PREFIX
 467                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 468                             tmp);
 469                 else if (lsapic->uid == acpi_id)
 470                         goto found;
 471         /* Processor statement declaration type */
 472         } else if (lsapic->processor_id == acpi_id)
 473                 goto found;
 474
 475         return 0;
 476 found:
 477         *apic_id = tmp;
 478         return 1;
 479 }
 480
 481 static int map_madt_entry(int type, u32 acpi_id)
 482 {
 483         unsigned long madt_end, entry;
 484         int apic_id = -1;
 485
 486         if (!madt)
 487                 return apic_id;
 488
 489         entry = (unsigned long)madt;
 490         madt_end = entry + madt->header.length;
 491
 492         /* Parse all entries looking for a match. */
 493
 494         entry += sizeof(struct acpi_table_madt);
 495         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 496                 struct acpi_subtable_header *header =
 497                         (struct acpi_subtable_header *)entry;
 498                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 499                         if (map_lapic_id(header, acpi_id, &apic_id))
 500                                 break;
 501                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 502                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 503                                 break;
 504                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 505                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 506                                 break;
 507                 }
 508                 entry += header->length;
 509         }
 510         return apic_id;
 511 }
 512
 513 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 514 {
 515         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 516         union acpi_object *obj;
 517         struct acpi_subtable_header *header;
 518         int apic_id = -1;
 519
 520         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 521                 goto exit;
 522
 523         if (!buffer.length || !buffer.pointer)
 524                 goto exit;
 525
 526         obj = buffer.pointer;
 527         if (obj->type != ACPI_TYPE_BUFFER ||
 528             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 529                 goto exit;
 530         }
 531
 532         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 533         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 534                 map_lapic_id(header, acpi_id, &apic_id);
 535         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 536                 map_lsapic_id(header, type, acpi_id, &apic_id);
 537         }
 538
 539 exit:
 540         if (buffer.pointer)
 541                 kfree(buffer.pointer);
 542         return apic_id;
 543 }
 544
 545 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 546 {
 547         int i;
 548         int apic_id = -1;
 549
 550         apic_id = map_mat_entry(handle, type, acpi_id);
 551         if (apic_id == -1)
 552                 apic_id = map_madt_entry(type, acpi_id);
 553         if (apic_id == -1)
 554                 return apic_id;
 555
 556         for_each_possible_cpu(i) {
 557                 if (cpu_physical_id(i) == apic_id)
 558                         return i;
 559         }
 560         return -1;
 561 }
 562 #endif
 563
 564 /* --------------------------------------------------------------------------
 565                                  Driver Interface
 566    -------------------------------------------------------------------------- */
 567
 568 static int acpi_processor_get_info(struct acpi_device *device)
 569 {
 570         acpi_status status = 0;
 571         union acpi_object object = { 0 };
 572         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 573         struct acpi_processor *pr;
 574         int cpu_index, device_declaration = 0;
 575         static int cpu0_initialized;
 576
 577         pr = acpi_driver_data(device);
 578         if (!pr)
 579                 return -EINVAL;
 580
 581         if (num_online_cpus() > 1)
 582                 errata.smp = TRUE;
 583
 584         acpi_processor_errata(pr);
 585
 586         /*
 587          * Check to see if we have bus mastering arbitration control.  This
 588          * is required for proper C3 usage (to maintain cache coherency).
 589          */
 590         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 591                 pr->flags.bm_control = 1;
 592                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 593                                   "Bus mastering arbitration control present\n"));
 594         } else
 595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 596                                   "No bus mastering arbitration control\n"));
 597
 598         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
 599                 /*
 600                  * Declared with "Device" statement; match _UID.
 601                  * Note that we don't handle string _UIDs yet.
 602                  */
 603                 unsigned long long value;
 604                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 605                                                 NULL, &value);
 606                 if (ACPI_FAILURE(status)) {
 607                         printk(KERN_ERR PREFIX
 608                             "Evaluating processor _UID [%#x]\n", status);
 609                         return -ENODEV;
 610                 }
 611                 device_declaration = 1;
 612                 pr->acpi_id = value;
 613         } else {
 614                 /* Declared with "Processor" statement; match ProcessorID */
 615                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 616                 if (ACPI_FAILURE(status)) {
 617                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 618                         return -ENODEV;
 619                 }
 620
 621                 /*
 622                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 623                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 624                  *      arch/xxx/acpi.c
 625                  */
 626                 pr->acpi_id = object.processor.proc_id;
 627         }
 628         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 629
 630         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 631         if (!cpu0_initialized && (cpu_index == -1) &&
 632             (num_online_cpus() == 1)) {
 633                 cpu_index = 0;
 634         }
 635
 636         cpu0_initialized = 1;
 637
 638         pr->id = cpu_index;
 639
 640         /*
 641          *  Extra Processor objects may be enumerated on MP systems with
 642          *  less than the max # of CPUs. They should be ignored _iff
 643          *  they are physically not present.
 644          */
 645         if (pr->id == -1) {
 646                 if (ACPI_FAILURE
 647                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 648                         return -ENODEV;
 649                 }
 650         }
 651
 652         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 653                           pr->acpi_id));
 654
 655         if (!object.processor.pblk_address)
 656                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 657         else if (object.processor.pblk_length != 6)
 658                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 659                             object.processor.pblk_length);
 660         else {
 661                 pr->throttling.address = object.processor.pblk_address;
 662                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 663                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 664
 665                 pr->pblk = object.processor.pblk_address;
 666
 667                 /*
 668                  * We don't care about error returns - we just try to mark
 669                  * these reserved so that nobody else is confused into thinking
 670                  * that this region might be unused..
 671                  *
 672                  * (In particular, allocating the IO range for Cardbus)
 673                  */
 674                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 675         }
 676
 677         /*
 678          * If ACPI describes a slot number for this CPU, we can use it
 679          * ensure we get the right value in the "physical id" field
 680          * of /proc/cpuinfo
 681          */
 682         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 683         if (ACPI_SUCCESS(status))
 684                 arch_fix_phys_package_id(pr->id, object.integer.value);
 685
 686         return 0;
 687 }
 688
 689 static DEFINE_PER_CPU(void *, processor_device_array);
 690
 691 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 692 {
 693         int result = 0;
 694         acpi_status status = AE_OK;
 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         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 732                                              acpi_processor_notify, pr);
 733
 734         /* _PDC call should be done before doing anything else (if reqd.). */
 735         arch_acpi_processor_init_pdc(pr);
 736         acpi_processor_set_pdc(pr);
 737 #ifdef CONFIG_CPU_FREQ
 738         acpi_processor_ppc_has_changed(pr);
 739 #endif
 740         acpi_processor_get_throttling_info(pr);
 741         acpi_processor_get_limit_info(pr);
 742
 743
 744         acpi_processor_power_init(pr, device);
 745
 746         pr->cdev = thermal_cooling_device_register("Processor", device,
 747                                                 &processor_cooling_ops);
 748         if (IS_ERR(pr->cdev)) {
 749                 result = PTR_ERR(pr->cdev);
 750                 goto end;
 751         }
 752
 753         dev_info(&device->dev, "registered as cooling_device%d\n",
 754                  pr->cdev->id);
 755
 756         result = sysfs_create_link(&device->dev.kobj,
 757                                    &pr->cdev->device.kobj,
 758                                    "thermal_cooling");
 759         if (result)
 760                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 761         result = sysfs_create_link(&pr->cdev->device.kobj,
 762                                    &device->dev.kobj,
 763                                    "device");
 764         if (result)
 765                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 766
 767         if (pr->flags.throttling) {
 768                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 769                        acpi_device_name(device), acpi_device_bid(device));
 770                 printk(" %d throttling states", pr->throttling.state_count);
 771                 printk(")\n");
 772         }
 773
 774       end:
 775
 776         return result;
 777 }
 778
 779 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 780 {
 781         struct acpi_processor *pr = data;
 782         struct acpi_device *device = NULL;
 783         int saved;
 784
 785         if (!pr)
 786                 return;
 787
 788         if (acpi_bus_get_device(pr->handle, &device))
 789                 return;
 790
 791         switch (event) {
 792         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 793                 saved = pr->performance_platform_limit;
 794                 acpi_processor_ppc_has_changed(pr);
 795                 if (saved == pr->performance_platform_limit)
 796                         break;
 797                 acpi_bus_generate_proc_event(device, event,
 798                                         pr->performance_platform_limit);
 799                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 800                                                   dev_name(&device->dev), event,
 801                                                   pr->performance_platform_limit);
 802                 break;
 803         case ACPI_PROCESSOR_NOTIFY_POWER:
 804                 acpi_processor_cst_has_changed(pr);
 805                 acpi_bus_generate_proc_event(device, event, 0);
 806                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 807                                                   dev_name(&device->dev), event, 0);
 808                 break;
 809         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 810                 acpi_processor_tstate_has_changed(pr);
 811                 acpi_bus_generate_proc_event(device, event, 0);
 812                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 813                                                   dev_name(&device->dev), event, 0);
 814         default:
 815                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 816                                   "Unsupported event [0x%x]\n", event));
 817                 break;
 818         }
 819
 820         return;
 821 }
 822
 823 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 824                 unsigned long action, void *hcpu)
 825 {
 826         unsigned int cpu = (unsigned long)hcpu;
 827         struct acpi_processor *pr = per_cpu(processors, cpu);
 828
 829         if (action == CPU_ONLINE && pr) {
 830                 acpi_processor_ppc_has_changed(pr);
 831                 acpi_processor_cst_has_changed(pr);
 832                 acpi_processor_tstate_has_changed(pr);
 833         }
 834         return NOTIFY_OK;
 835 }
 836
 837 static struct notifier_block acpi_cpu_notifier =
 838 {
 839             .notifier_call = acpi_cpu_soft_notify,
 840 };
 841
 842 static int acpi_processor_add(struct acpi_device *device)
 843 {
 844         struct acpi_processor *pr = NULL;
 845
 846
 847         if (!device)
 848                 return -EINVAL;
 849
 850         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 851         if (!pr)
 852                 return -ENOMEM;
 853
 854         if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 855                 kfree(pr);
 856                 return -ENOMEM;
 857         }
 858
 859         pr->handle = device->handle;
 860         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 861         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 862         device->driver_data = pr;
 863
 864         return 0;
 865 }
 866
 867 static int acpi_processor_remove(struct acpi_device *device, int type)
 868 {
 869         acpi_status status = AE_OK;
 870         struct acpi_processor *pr = NULL;
 871
 872
 873         if (!device || !acpi_driver_data(device))
 874                 return -EINVAL;
 875
 876         pr = acpi_driver_data(device);
 877
 878         if (pr->id >= nr_cpu_ids)
 879                 goto free;
 880
 881         if (type == ACPI_BUS_REMOVAL_EJECT) {
 882                 if (acpi_processor_handle_eject(pr))
 883                         return -EINVAL;
 884         }
 885
 886         acpi_processor_power_exit(pr, device);
 887
 888         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 889                                             acpi_processor_notify);
 890
 891         sysfs_remove_link(&device->dev.kobj, "sysdev");
 892
 893         acpi_processor_remove_fs(device);
 894
 895         if (pr->cdev) {
 896                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 897                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 898                 thermal_cooling_device_unregister(pr->cdev);
 899                 pr->cdev = NULL;
 900         }
 901
 902         per_cpu(processors, pr->id) = NULL;
 903         per_cpu(processor_device_array, pr->id) = NULL;
 904
 905 free:
 906         free_cpumask_var(pr->throttling.shared_cpu_map);
 907         kfree(pr);
 908
 909         return 0;
 910 }
 911
 912 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 913 /****************************************************************************
 914  *      Acpi processor hotplug support                                      *
 915  ****************************************************************************/
 916
 917 static int is_processor_present(acpi_handle handle)
 918 {
 919         acpi_status status;
 920         unsigned long long sta = 0;
 921
 922
 923         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 924
 925         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 926                 return 1;
 927
 928         /*
 929          * _STA is mandatory for a processor that supports hot plug
 930          */
 931         if (status == AE_NOT_FOUND)
 932                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 933                                 "Processor does not support hot plug\n"));
 934         else
 935                 ACPI_EXCEPTION((AE_INFO, status,
 936                                 "Processor Device is not present"));
 937         return 0;
 938 }
 939
 940 static
 941 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 942 {
 943         acpi_handle phandle;
 944         struct acpi_device *pdev;
 945         struct acpi_processor *pr;
 946
 947
 948         if (acpi_get_parent(handle, &phandle)) {
 949                 return -ENODEV;
 950         }
 951
 952         if (acpi_bus_get_device(phandle, &pdev)) {
 953                 return -ENODEV;
 954         }
 955
 956         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 957                 return -ENODEV;
 958         }
 959
 960         acpi_bus_start(*device);
 961
 962         pr = acpi_driver_data(*device);
 963         if (!pr)
 964                 return -ENODEV;
 965
 966         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 967                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 968         }
 969         return 0;
 970 }
 971
 972 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 973                                                 u32 event, void *data)
 974 {
 975         struct acpi_processor *pr;
 976         struct acpi_device *device = NULL;
 977         int result;
 978
 979
 980         switch (event) {
 981         case ACPI_NOTIFY_BUS_CHECK:
 982         case ACPI_NOTIFY_DEVICE_CHECK:
 983                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 984                 "Processor driver received %s event\n",
 985                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 986                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 987
 988                 if (!is_processor_present(handle))
 989                         break;
 990
 991                 if (acpi_bus_get_device(handle, &device)) {
 992                         result = acpi_processor_device_add(handle, &device);
 993                         if (result)
 994                                 printk(KERN_ERR PREFIX
 995                                             "Unable to add the device\n");
 996                         break;
 997                 }
 998
 999                 pr = acpi_driver_data(device);
1000                 if (!pr) {
1001                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
1002                         break;
1003                 }
1004
1005                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
1006                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1007                         break;
1008                 }
1009
1010                 result = acpi_processor_start(device);
1011                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
1012                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
1013                 } else {
1014                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
1015                                     acpi_device_bid(device));
1016                 }
1017                 break;
1018         case ACPI_NOTIFY_EJECT_REQUEST:
1019                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1020                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1021
1022                 if (acpi_bus_get_device(handle, &device)) {
1023                         printk(KERN_ERR PREFIX
1024                                     "Device don't exist, dropping EJECT\n");
1025                         break;
1026                 }
1027                 pr = acpi_driver_data(device);
1028                 if (!pr) {
1029                         printk(KERN_ERR PREFIX
1030                                     "Driver data is NULL, dropping EJECT\n");
1031                         return;
1032                 }
1033
1034                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1035                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1036                 break;
1037         default:
1038                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1039                                   "Unsupported event [0x%x]\n", event));
1040                 break;
1041         }
1042
1043         return;
1044 }
1045
1046 static acpi_status
1047 processor_walk_namespace_cb(acpi_handle handle,
1048                             u32 lvl, void *context, void **rv)
1049 {
1050         acpi_status status;
1051         int *action = context;
1052         acpi_object_type type = 0;
1053
1054         status = acpi_get_type(handle, &type);
1055         if (ACPI_FAILURE(status))
1056                 return (AE_OK);
1057
1058         if (type != ACPI_TYPE_PROCESSOR)
1059                 return (AE_OK);
1060
1061         switch (*action) {
1062         case INSTALL_NOTIFY_HANDLER:
1063                 acpi_install_notify_handler(handle,
1064                                             ACPI_SYSTEM_NOTIFY,
1065                                             acpi_processor_hotplug_notify,
1066                                             NULL);
1067                 break;
1068         case UNINSTALL_NOTIFY_HANDLER:
1069                 acpi_remove_notify_handler(handle,
1070                                            ACPI_SYSTEM_NOTIFY,
1071                                            acpi_processor_hotplug_notify);
1072                 break;
1073         default:
1074                 break;
1075         }
1076
1077         return (AE_OK);
1078 }
1079
1080 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1081 {
1082
1083         if (!is_processor_present(handle)) {
1084                 return AE_ERROR;
1085         }
1086
1087         if (acpi_map_lsapic(handle, p_cpu))
1088                 return AE_ERROR;
1089
1090         if (arch_register_cpu(*p_cpu)) {
1091                 acpi_unmap_lsapic(*p_cpu);
1092                 return AE_ERROR;
1093         }
1094
1095         return AE_OK;
1096 }
1097
1098 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1099 {
1100         if (cpu_online(pr->id))
1101                 cpu_down(pr->id);
1102
1103         arch_unregister_cpu(pr->id);
1104         acpi_unmap_lsapic(pr->id);
1105         return (0);
1106 }
1107 #else
1108 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1109 {
1110         return AE_ERROR;
1111 }
1112 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1113 {
1114         return (-EINVAL);
1115 }
1116 #endif
1117
1118 static
1119 void acpi_processor_install_hotplug_notify(void)
1120 {
1121 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1122         int action = INSTALL_NOTIFY_HANDLER;
1123         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1124                             ACPI_ROOT_OBJECT,
1125                             ACPI_UINT32_MAX,
1126                             processor_walk_namespace_cb, &action, NULL);
1127 #endif
1128         register_hotcpu_notifier(&acpi_cpu_notifier);
1129 }
1130
1131 static
1132 void acpi_processor_uninstall_hotplug_notify(void)
1133 {
1134 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1135         int action = UNINSTALL_NOTIFY_HANDLER;
1136         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1137                             ACPI_ROOT_OBJECT,
1138                             ACPI_UINT32_MAX,
1139                             processor_walk_namespace_cb, &action, NULL);
1140 #endif
1141         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1142 }
1143
1144 /*
1145  * We keep the driver loaded even when ACPI is not running.
1146  * This is needed for the powernow-k8 driver, that works even without
1147  * ACPI, but needs symbols from this driver
1148  */
1149
1150 static int __init acpi_processor_init(void)
1151 {
1152         int result = 0;
1153
1154         memset(&errata, 0, sizeof(errata));
1155
1156 #ifdef CONFIG_SMP
1157         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1158                                 (struct acpi_table_header **)&madt)))
1159                 madt = NULL;
1160 #endif
1161
1162         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1163         if (!acpi_processor_dir)
1164                 return -ENOMEM;
1165
1166         /*
1167          * Check whether the system is DMI table. If yes, OSPM
1168          * should not use mwait for CPU-states.
1169          */
1170         dmi_check_system(processor_idle_dmi_table);
1171         result = cpuidle_register_driver(&acpi_idle_driver);
1172         if (result < 0)
1173                 goto out_proc;
1174
1175         result = acpi_bus_register_driver(&acpi_processor_driver);
1176         if (result < 0)
1177                 goto out_cpuidle;
1178
1179         acpi_processor_install_hotplug_notify();
1180
1181         acpi_thermal_cpufreq_init();
1182
1183         acpi_processor_ppc_init();
1184
1185         acpi_processor_throttling_init();
1186
1187         return 0;
1188
1189 out_cpuidle:
1190         cpuidle_unregister_driver(&acpi_idle_driver);
1191
1192 out_proc:
1193         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1194
1195         return result;
1196 }
1197
1198 static void __exit acpi_processor_exit(void)
1199 {
1200         acpi_processor_ppc_exit();
1201
1202         acpi_thermal_cpufreq_exit();
1203
1204         acpi_processor_uninstall_hotplug_notify();
1205
1206         acpi_bus_unregister_driver(&acpi_processor_driver);
1207
1208         cpuidle_unregister_driver(&acpi_idle_driver);
1209
1210         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1211
1212         return;
1213 }
1214
1215 module_init(acpi_processor_init);
1216 module_exit(acpi_processor_exit);
1217
1218 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1219
1220 MODULE_ALIAS("processor");