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   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define ACPI_PROCESSOR_CLASS            "processor"
  63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  64 #define ACPI_PROCESSOR_FILE_INFO        "info"
  65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  70
  71 #define ACPI_PROCESSOR_LIMIT_USER       0
  72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  73
  74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  75 ACPI_MODULE_NAME("processor_core");
  76
  77 MODULE_AUTHOR("Paul Diefenbaugh");
  78 MODULE_DESCRIPTION("ACPI Processor Driver");
  79 MODULE_LICENSE("GPL");
  80
  81 static int acpi_processor_add(struct acpi_device *device);
  82 static int acpi_processor_remove(struct acpi_device *device, int type);
  83 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  84 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  85 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  86 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  87
  88
  89 static const struct acpi_device_id processor_device_ids[] = {
  90         {ACPI_PROCESSOR_OBJECT_HID, 0},
  91         {"ACPI0007", 0},
  92         {"", 0},
  93 };
  94 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  95
  96 static struct acpi_driver acpi_processor_driver = {
  97         .name = "processor",
  98         .class = ACPI_PROCESSOR_CLASS,
  99         .ids = processor_device_ids,
 100         .ops = {
 101                 .add = acpi_processor_add,
 102                 .remove = acpi_processor_remove,
 103                 .suspend = acpi_processor_suspend,
 104                 .resume = acpi_processor_resume,
 105                 .notify = acpi_processor_notify,
 106                 },
 107 };
 108
 109 #define INSTALL_NOTIFY_HANDLER          1
 110 #define UNINSTALL_NOTIFY_HANDLER        2
 111
 112 static const struct file_operations acpi_processor_info_fops = {
 113         .owner = THIS_MODULE,
 114         .open = acpi_processor_info_open_fs,
 115         .read = seq_read,
 116         .llseek = seq_lseek,
 117         .release = single_release,
 118 };
 119
 120 DEFINE_PER_CPU(struct acpi_processor *, processors);
 121 struct acpi_processor_errata errata __read_mostly;
 122 static int set_no_mwait(const struct dmi_system_id *id)
 123 {
 124         printk(KERN_NOTICE PREFIX "%s detected - "
 125                 "disabling mwait for CPU C-states\n", id->ident);
 126         idle_nomwait = 1;
 127         return 0;
 128 }
 129
 130 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 131         {
 132         set_no_mwait, "IFL91 board", {
 133         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 134         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 135         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 136         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 137         {
 138         set_no_mwait, "Extensa 5220", {
 139         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 140         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 141         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 142         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 143         {},
 144 };
 145
 146 /* --------------------------------------------------------------------------
 147                                 Errata Handling
 148    -------------------------------------------------------------------------- */
 149
 150 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 151 {
 152         u8 value1 = 0;
 153         u8 value2 = 0;
 154
 155
 156         if (!dev)
 157                 return -EINVAL;
 158
 159         /*
 160          * Note that 'dev' references the PIIX4 ACPI Controller.
 161          */
 162
 163         switch (dev->revision) {
 164         case 0:
 165                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 166                 break;
 167         case 1:
 168                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 169                 break;
 170         case 2:
 171                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 172                 break;
 173         case 3:
 174                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 175                 break;
 176         default:
 177                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 178                 break;
 179         }
 180
 181         switch (dev->revision) {
 182
 183         case 0:         /* PIIX4 A-step */
 184         case 1:         /* PIIX4 B-step */
 185                 /*
 186                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 187                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 188                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 189                  * 2002 PIIX4 specification update.  Applies to only older
 190                  * PIIX4 models.
 191                  */
 192                 errata.piix4.throttle = 1;
 193
 194         case 2:         /* PIIX4E */
 195         case 3:         /* PIIX4M */
 196                 /*
 197                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 198                  * Livelock") from the January 2002 PIIX4 specification update.
 199                  * Applies to all PIIX4 models.
 200                  */
 201
 202                 /*
 203                  * BM-IDE
 204                  * ------
 205                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 206                  * Status register address.  We'll use this later to read
 207                  * each IDE controller's DMA status to make sure we catch all
 208                  * DMA activity.
 209                  */
 210                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 211                                      PCI_DEVICE_ID_INTEL_82371AB,
 212                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 213                 if (dev) {
 214                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 215                         pci_dev_put(dev);
 216                 }
 217
 218                 /*
 219                  * Type-F DMA
 220                  * ----------
 221                  * Find the PIIX4 ISA Controller and read the Motherboard
 222                  * DMA controller's status to see if Type-F (Fast) DMA mode
 223                  * is enabled (bit 7) on either channel.  Note that we'll
 224                  * disable C3 support if this is enabled, as some legacy
 225                  * devices won't operate well if fast DMA is disabled.
 226                  */
 227                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 228                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 229                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 230                 if (dev) {
 231                         pci_read_config_byte(dev, 0x76, &value1);
 232                         pci_read_config_byte(dev, 0x77, &value2);
 233                         if ((value1 & 0x80) || (value2 & 0x80))
 234                                 errata.piix4.fdma = 1;
 235                         pci_dev_put(dev);
 236                 }
 237
 238                 break;
 239         }
 240
 241         if (errata.piix4.bmisx)
 242                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 243                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 244         if (errata.piix4.fdma)
 245                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 246                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 247
 248         return 0;
 249 }
 250
 251 static int acpi_processor_errata(struct acpi_processor *pr)
 252 {
 253         int result = 0;
 254         struct pci_dev *dev = NULL;
 255
 256
 257         if (!pr)
 258                 return -EINVAL;
 259
 260         /*
 261          * PIIX4
 262          */
 263         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 264                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 265                              PCI_ANY_ID, NULL);
 266         if (dev) {
 267                 result = acpi_processor_errata_piix4(dev);
 268                 pci_dev_put(dev);
 269         }
 270
 271         return result;
 272 }
 273
 274 /* --------------------------------------------------------------------------
 275                               Common ACPI processor functions
 276    -------------------------------------------------------------------------- */
 277
 278 /*
 279  * _PDC is required for a BIOS-OS handshake for most of the newer
 280  * ACPI processor features.
 281  */
 282 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 283 {
 284         struct acpi_object_list *pdc_in = pr->pdc;
 285         acpi_status status = AE_OK;
 286
 287
 288         if (!pdc_in)
 289                 return status;
 290         if (idle_nomwait) {
 291                 /*
 292                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 293                  * mode will be disabled in the parameter of _PDC object.
 294                  * Of course C1_FFH access mode will also be disabled.
 295                  */
 296                 union acpi_object *obj;
 297                 u32 *buffer = NULL;
 298
 299                 obj = pdc_in->pointer;
 300                 buffer = (u32 *)(obj->buffer.pointer);
 301                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 302
 303         }
 304         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 305
 306         if (ACPI_FAILURE(status))
 307                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 308                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 309
 310         return status;
 311 }
 312
 313 /* --------------------------------------------------------------------------
 314                               FS Interface (/proc)
 315    -------------------------------------------------------------------------- */
 316
 317 static struct proc_dir_entry *acpi_processor_dir = NULL;
 318
 319 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 320 {
 321         struct acpi_processor *pr = seq->private;
 322
 323
 324         if (!pr)
 325                 goto end;
 326
 327         seq_printf(seq, "processor id:            %d\n"
 328                    "acpi id:                 %d\n"
 329                    "bus mastering control:   %s\n"
 330                    "power management:        %s\n"
 331                    "throttling control:      %s\n"
 332                    "limit interface:         %s\n",
 333                    pr->id,
 334                    pr->acpi_id,
 335                    pr->flags.bm_control ? "yes" : "no",
 336                    pr->flags.power ? "yes" : "no",
 337                    pr->flags.throttling ? "yes" : "no",
 338                    pr->flags.limit ? "yes" : "no");
 339
 340       end:
 341         return 0;
 342 }
 343
 344 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 345 {
 346         return single_open(file, acpi_processor_info_seq_show,
 347                            PDE(inode)->data);
 348 }
 349
 350 static int acpi_processor_add_fs(struct acpi_device *device)
 351 {
 352         struct proc_dir_entry *entry = NULL;
 353
 354
 355         if (!acpi_device_dir(device)) {
 356                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 357                                                      acpi_processor_dir);
 358                 if (!acpi_device_dir(device))
 359                         return -ENODEV;
 360         }
 361
 362         /* 'info' [R] */
 363         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 364                                  S_IRUGO, acpi_device_dir(device),
 365                                  &acpi_processor_info_fops,
 366                                  acpi_driver_data(device));
 367         if (!entry)
 368                 return -EIO;
 369
 370         /* 'throttling' [R/W] */
 371         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 372                                  S_IFREG | S_IRUGO | S_IWUSR,
 373                                  acpi_device_dir(device),
 374                                  &acpi_processor_throttling_fops,
 375                                  acpi_driver_data(device));
 376         if (!entry)
 377                 return -EIO;
 378
 379         /* 'limit' [R/W] */
 380         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 381                                  S_IFREG | S_IRUGO | S_IWUSR,
 382                                  acpi_device_dir(device),
 383                                  &acpi_processor_limit_fops,
 384                                  acpi_driver_data(device));
 385         if (!entry)
 386                 return -EIO;
 387         return 0;
 388 }
 389
 390 static int acpi_processor_remove_fs(struct acpi_device *device)
 391 {
 392
 393         if (acpi_device_dir(device)) {
 394                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 395                                   acpi_device_dir(device));
 396                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 397                                   acpi_device_dir(device));
 398                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 399                                   acpi_device_dir(device));
 400                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 401                 acpi_device_dir(device) = NULL;
 402         }
 403
 404         return 0;
 405 }
 406
 407 /* Use the acpiid in MADT to map cpus in case of SMP */
 408
 409 #ifndef CONFIG_SMP
 410 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 411 #else
 412
 413 static struct acpi_table_madt *madt;
 414
 415 static int map_lapic_id(struct acpi_subtable_header *entry,
 416                  u32 acpi_id, int *apic_id)
 417 {
 418         struct acpi_madt_local_apic *lapic =
 419                 (struct acpi_madt_local_apic *)entry;
 420         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 421             lapic->processor_id == acpi_id) {
 422                 *apic_id = lapic->id;
 423                 return 1;
 424         }
 425         return 0;
 426 }
 427
 428 static int map_x2apic_id(struct acpi_subtable_header *entry,
 429                          int device_declaration, u32 acpi_id, int *apic_id)
 430 {
 431         struct acpi_madt_local_x2apic *apic =
 432                 (struct acpi_madt_local_x2apic *)entry;
 433         u32 tmp = apic->local_apic_id;
 434
 435         /* Only check enabled APICs*/
 436         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 437                 return 0;
 438
 439         /* Device statement declaration type */
 440         if (device_declaration) {
 441                 if (apic->uid == acpi_id)
 442                         goto found;
 443         }
 444
 445         return 0;
 446 found:
 447         *apic_id = tmp;
 448         return 1;
 449 }
 450
 451 static int map_lsapic_id(struct acpi_subtable_header *entry,
 452                 int device_declaration, u32 acpi_id, int *apic_id)
 453 {
 454         struct acpi_madt_local_sapic *lsapic =
 455                 (struct acpi_madt_local_sapic *)entry;
 456         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 457
 458         /* Only check enabled APICs*/
 459         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 460                 return 0;
 461
 462         /* Device statement declaration type */
 463         if (device_declaration) {
 464                 if (entry->length < 16)
 465                         printk(KERN_ERR PREFIX
 466                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 467                             tmp);
 468                 else if (lsapic->uid == acpi_id)
 469                         goto found;
 470         /* Processor statement declaration type */
 471         } else if (lsapic->processor_id == acpi_id)
 472                 goto found;
 473
 474         return 0;
 475 found:
 476         *apic_id = tmp;
 477         return 1;
 478 }
 479
 480 static int map_madt_entry(int type, u32 acpi_id)
 481 {
 482         unsigned long madt_end, entry;
 483         int apic_id = -1;
 484
 485         if (!madt)
 486                 return apic_id;
 487
 488         entry = (unsigned long)madt;
 489         madt_end = entry + madt->header.length;
 490
 491         /* Parse all entries looking for a match. */
 492
 493         entry += sizeof(struct acpi_table_madt);
 494         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 495                 struct acpi_subtable_header *header =
 496                         (struct acpi_subtable_header *)entry;
 497                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 498                         if (map_lapic_id(header, acpi_id, &apic_id))
 499                                 break;
 500                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 501                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 502                                 break;
 503                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 504                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 505                                 break;
 506                 }
 507                 entry += header->length;
 508         }
 509         return apic_id;
 510 }
 511
 512 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 513 {
 514         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 515         union acpi_object *obj;
 516         struct acpi_subtable_header *header;
 517         int apic_id = -1;
 518
 519         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 520                 goto exit;
 521
 522         if (!buffer.length || !buffer.pointer)
 523                 goto exit;
 524
 525         obj = buffer.pointer;
 526         if (obj->type != ACPI_TYPE_BUFFER ||
 527             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 528                 goto exit;
 529         }
 530
 531         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 532         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 533                 map_lapic_id(header, acpi_id, &apic_id);
 534         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 535                 map_lsapic_id(header, type, acpi_id, &apic_id);
 536         }
 537
 538 exit:
 539         if (buffer.pointer)
 540                 kfree(buffer.pointer);
 541         return apic_id;
 542 }
 543
 544 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 545 {
 546         int i;
 547         int apic_id = -1;
 548
 549         apic_id = map_mat_entry(handle, type, acpi_id);
 550         if (apic_id == -1)
 551                 apic_id = map_madt_entry(type, acpi_id);
 552         if (apic_id == -1)
 553                 return apic_id;
 554
 555         for_each_possible_cpu(i) {
 556                 if (cpu_physical_id(i) == apic_id)
 557                         return i;
 558         }
 559         return -1;
 560 }
 561 #endif
 562
 563 /* --------------------------------------------------------------------------
 564                                  Driver Interface
 565    -------------------------------------------------------------------------- */
 566
 567 static int acpi_processor_get_info(struct acpi_device *device)
 568 {
 569         acpi_status status = 0;
 570         union acpi_object object = { 0 };
 571         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 572         struct acpi_processor *pr;
 573         int cpu_index, device_declaration = 0;
 574         static int cpu0_initialized;
 575
 576         pr = acpi_driver_data(device);
 577         if (!pr)
 578                 return -EINVAL;
 579
 580         if (num_online_cpus() > 1)
 581                 errata.smp = TRUE;
 582
 583         acpi_processor_errata(pr);
 584
 585         /*
 586          * Check to see if we have bus mastering arbitration control.  This
 587          * is required for proper C3 usage (to maintain cache coherency).
 588          */
 589         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 590                 pr->flags.bm_control = 1;
 591                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 592                                   "Bus mastering arbitration control present\n"));
 593         } else
 594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 595                                   "No bus mastering arbitration control\n"));
 596
 597         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 598                 /* Declared with "Processor" statement; match ProcessorID */
 599                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 600                 if (ACPI_FAILURE(status)) {
 601                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 602                         return -ENODEV;
 603                 }
 604
 605                 /*
 606                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 607                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 608                  *      arch/xxx/acpi.c
 609                  */
 610                 pr->acpi_id = object.processor.proc_id;
 611         } else {
 612                 /*
 613                  * Declared with "Device" statement; match _UID.
 614                  * Note that we don't handle string _UIDs yet.
 615                  */
 616                 unsigned long long value;
 617                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 618                                                 NULL, &value);
 619                 if (ACPI_FAILURE(status)) {
 620                         printk(KERN_ERR PREFIX
 621                             "Evaluating processor _UID [%#x]\n", status);
 622                         return -ENODEV;
 623                 }
 624                 device_declaration = 1;
 625                 pr->acpi_id = value;
 626         }
 627         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 628
 629         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 630         if (!cpu0_initialized && (cpu_index == -1) &&
 631             (num_online_cpus() == 1)) {
 632                 cpu_index = 0;
 633         }
 634
 635         cpu0_initialized = 1;
 636
 637         pr->id = cpu_index;
 638
 639         /*
 640          *  Extra Processor objects may be enumerated on MP systems with
 641          *  less than the max # of CPUs. They should be ignored _iff
 642          *  they are physically not present.
 643          */
 644         if (pr->id == -1) {
 645                 if (ACPI_FAILURE
 646                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 647                         return -ENODEV;
 648                 }
 649         }
 650         /*
 651          * On some boxes several processors use the same processor bus id.
 652          * But they are located in different scope. For example:
 653          * \_SB.SCK0.CPU0
 654          * \_SB.SCK1.CPU0
 655          * Rename the processor device bus id. And the new bus id will be
 656          * generated as the following format:
 657          * CPU+CPU ID.
 658          */
 659         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 660         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 661                           pr->acpi_id));
 662
 663         if (!object.processor.pblk_address)
 664                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 665         else if (object.processor.pblk_length != 6)
 666                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 667                             object.processor.pblk_length);
 668         else {
 669                 pr->throttling.address = object.processor.pblk_address;
 670                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 671                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 672
 673                 pr->pblk = object.processor.pblk_address;
 674
 675                 /*
 676                  * We don't care about error returns - we just try to mark
 677                  * these reserved so that nobody else is confused into thinking
 678                  * that this region might be unused..
 679                  *
 680                  * (In particular, allocating the IO range for Cardbus)
 681                  */
 682                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 683         }
 684
 685         /*
 686          * If ACPI describes a slot number for this CPU, we can use it
 687          * ensure we get the right value in the "physical id" field
 688          * of /proc/cpuinfo
 689          */
 690         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 691         if (ACPI_SUCCESS(status))
 692                 arch_fix_phys_package_id(pr->id, object.integer.value);
 693
 694         return 0;
 695 }
 696
 697 static DEFINE_PER_CPU(void *, processor_device_array);
 698
 699 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 700 {
 701         struct acpi_processor *pr = acpi_driver_data(device);
 702         int saved;
 703
 704         if (!pr)
 705                 return;
 706
 707         switch (event) {
 708         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 709                 saved = pr->performance_platform_limit;
 710                 acpi_processor_ppc_has_changed(pr);
 711                 if (saved == pr->performance_platform_limit)
 712                         break;
 713                 acpi_bus_generate_proc_event(device, event,
 714                                         pr->performance_platform_limit);
 715                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 716                                                   dev_name(&device->dev), event,
 717                                                   pr->performance_platform_limit);
 718                 break;
 719         case ACPI_PROCESSOR_NOTIFY_POWER:
 720                 acpi_processor_cst_has_changed(pr);
 721                 acpi_bus_generate_proc_event(device, event, 0);
 722                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 723                                                   dev_name(&device->dev), event, 0);
 724                 break;
 725         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 726                 acpi_processor_tstate_has_changed(pr);
 727                 acpi_bus_generate_proc_event(device, event, 0);
 728                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 729                                                   dev_name(&device->dev), event, 0);
 730         default:
 731                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 732                                   "Unsupported event [0x%x]\n", event));
 733                 break;
 734         }
 735
 736         return;
 737 }
 738
 739 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 740                 unsigned long action, void *hcpu)
 741 {
 742         unsigned int cpu = (unsigned long)hcpu;
 743         struct acpi_processor *pr = per_cpu(processors, cpu);
 744
 745         if (action == CPU_ONLINE && pr) {
 746                 acpi_processor_ppc_has_changed(pr);
 747                 acpi_processor_cst_has_changed(pr);
 748                 acpi_processor_tstate_has_changed(pr);
 749         }
 750         return NOTIFY_OK;
 751 }
 752
 753 static struct notifier_block acpi_cpu_notifier =
 754 {
 755             .notifier_call = acpi_cpu_soft_notify,
 756 };
 757
 758 static int acpi_processor_add(struct acpi_device *device)
 759 {
 760         struct acpi_processor *pr = NULL;
 761         int result = 0;
 762         struct sys_device *sysdev;
 763
 764         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 765         if (!pr)
 766                 return -ENOMEM;
 767
 768         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 769                 kfree(pr);
 770                 return -ENOMEM;
 771         }
 772
 773         pr->handle = device->handle;
 774         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 775         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 776         device->driver_data = pr;
 777
 778         result = acpi_processor_get_info(device);
 779         if (result) {
 780                 /* Processor is physically not present */
 781                 return 0;
 782         }
 783
 784         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 785
 786         /*
 787          * Buggy BIOS check
 788          * ACPI id of processors can be reported wrongly by the BIOS.
 789          * Don't trust it blindly
 790          */
 791         if (per_cpu(processor_device_array, pr->id) != NULL &&
 792             per_cpu(processor_device_array, pr->id) != device) {
 793                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 794                         "for the processor\n");
 795                 result = -ENODEV;
 796                 goto err_free_cpumask;
 797         }
 798         per_cpu(processor_device_array, pr->id) = device;
 799
 800         per_cpu(processors, pr->id) = pr;
 801
 802         result = acpi_processor_add_fs(device);
 803         if (result)
 804                 goto err_free_cpumask;
 805
 806         sysdev = get_cpu_sysdev(pr->id);
 807         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 808                 result = -EFAULT;
 809                 goto err_remove_fs;
 810         }
 811
 812         /* _PDC call should be done before doing anything else (if reqd.). */
 813         arch_acpi_processor_init_pdc(pr);
 814         acpi_processor_set_pdc(pr);
 815         arch_acpi_processor_cleanup_pdc(pr);
 816
 817 #ifdef CONFIG_CPU_FREQ
 818         acpi_processor_ppc_has_changed(pr);
 819 #endif
 820         acpi_processor_get_throttling_info(pr);
 821         acpi_processor_get_limit_info(pr);
 822
 823
 824         acpi_processor_power_init(pr, device);
 825
 826         pr->cdev = thermal_cooling_device_register("Processor", device,
 827                                                 &processor_cooling_ops);
 828         if (IS_ERR(pr->cdev)) {
 829                 result = PTR_ERR(pr->cdev);
 830                 goto err_power_exit;
 831         }
 832
 833         dev_info(&device->dev, "registered as cooling_device%d\n",
 834                  pr->cdev->id);
 835
 836         result = sysfs_create_link(&device->dev.kobj,
 837                                    &pr->cdev->device.kobj,
 838                                    "thermal_cooling");
 839         if (result) {
 840                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 841                 goto err_thermal_unregister;
 842         }
 843         result = sysfs_create_link(&pr->cdev->device.kobj,
 844                                    &device->dev.kobj,
 845                                    "device");
 846         if (result) {
 847                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 848                 goto err_remove_sysfs;
 849         }
 850
 851         if (pr->flags.throttling) {
 852                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 853                        acpi_device_name(device), acpi_device_bid(device));
 854                 printk(" %d throttling states", pr->throttling.state_count);
 855                 printk(")\n");
 856         }
 857
 858         return 0;
 859
 860 err_remove_sysfs:
 861         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 862 err_thermal_unregister:
 863         thermal_cooling_device_unregister(pr->cdev);
 864 err_power_exit:
 865         acpi_processor_power_exit(pr, device);
 866 err_remove_fs:
 867         acpi_processor_remove_fs(device);
 868 err_free_cpumask:
 869         free_cpumask_var(pr->throttling.shared_cpu_map);
 870
 871         return result;
 872 }
 873
 874 static int acpi_processor_remove(struct acpi_device *device, int type)
 875 {
 876         struct acpi_processor *pr = NULL;
 877
 878
 879         if (!device || !acpi_driver_data(device))
 880                 return -EINVAL;
 881
 882         pr = acpi_driver_data(device);
 883
 884         if (pr->id >= nr_cpu_ids)
 885                 goto free;
 886
 887         if (type == ACPI_BUS_REMOVAL_EJECT) {
 888                 if (acpi_processor_handle_eject(pr))
 889                         return -EINVAL;
 890         }
 891
 892         acpi_processor_power_exit(pr, device);
 893
 894         sysfs_remove_link(&device->dev.kobj, "sysdev");
 895
 896         acpi_processor_remove_fs(device);
 897
 898         if (pr->cdev) {
 899                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 900                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 901                 thermal_cooling_device_unregister(pr->cdev);
 902                 pr->cdev = NULL;
 903         }
 904
 905         per_cpu(processors, pr->id) = NULL;
 906         per_cpu(processor_device_array, pr->id) = NULL;
 907
 908 free:
 909         free_cpumask_var(pr->throttling.shared_cpu_map);
 910         kfree(pr);
 911
 912         return 0;
 913 }
 914
 915 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 916 /****************************************************************************
 917  *      Acpi processor hotplug support                                      *
 918  ****************************************************************************/
 919
 920 static int is_processor_present(acpi_handle handle)
 921 {
 922         acpi_status status;
 923         unsigned long long sta = 0;
 924
 925
 926         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 927
 928         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 929                 return 1;
 930
 931         /*
 932          * _STA is mandatory for a processor that supports hot plug
 933          */
 934         if (status == AE_NOT_FOUND)
 935                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 936                                 "Processor does not support hot plug\n"));
 937         else
 938                 ACPI_EXCEPTION((AE_INFO, status,
 939                                 "Processor Device is not present"));
 940         return 0;
 941 }
 942
 943 static
 944 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 945 {
 946         acpi_handle phandle;
 947         struct acpi_device *pdev;
 948
 949
 950         if (acpi_get_parent(handle, &phandle)) {
 951                 return -ENODEV;
 952         }
 953
 954         if (acpi_bus_get_device(phandle, &pdev)) {
 955                 return -ENODEV;
 956         }
 957
 958         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 959                 return -ENODEV;
 960         }
 961
 962         return 0;
 963 }
 964
 965 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 966                                                 u32 event, void *data)
 967 {
 968         struct acpi_processor *pr;
 969         struct acpi_device *device = NULL;
 970         int result;
 971
 972
 973         switch (event) {
 974         case ACPI_NOTIFY_BUS_CHECK:
 975         case ACPI_NOTIFY_DEVICE_CHECK:
 976                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 977                 "Processor driver received %s event\n",
 978                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 979                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 980
 981                 if (!is_processor_present(handle))
 982                         break;
 983
 984                 if (acpi_bus_get_device(handle, &device)) {
 985                         result = acpi_processor_device_add(handle, &device);
 986                         if (result)
 987                                 printk(KERN_ERR PREFIX
 988                                             "Unable to add the device\n");
 989                         break;
 990                 }
 991                 break;
 992         case ACPI_NOTIFY_EJECT_REQUEST:
 993                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 994                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 995
 996                 if (acpi_bus_get_device(handle, &device)) {
 997                         printk(KERN_ERR PREFIX
 998                                     "Device don't exist, dropping EJECT\n");
 999                         break;
1000                 }
1001                 pr = acpi_driver_data(device);
1002                 if (!pr) {
1003                         printk(KERN_ERR PREFIX
1004                                     "Driver data is NULL, dropping EJECT\n");
1005                         return;
1006                 }
1007                 break;
1008         default:
1009                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1010                                   "Unsupported event [0x%x]\n", event));
1011                 break;
1012         }
1013
1014         return;
1015 }
1016
1017 static acpi_status
1018 processor_walk_namespace_cb(acpi_handle handle,
1019                             u32 lvl, void *context, void **rv)
1020 {
1021         acpi_status status;
1022         int *action = context;
1023         acpi_object_type type = 0;
1024
1025         status = acpi_get_type(handle, &type);
1026         if (ACPI_FAILURE(status))
1027                 return (AE_OK);
1028
1029         if (type != ACPI_TYPE_PROCESSOR)
1030                 return (AE_OK);
1031
1032         switch (*action) {
1033         case INSTALL_NOTIFY_HANDLER:
1034                 acpi_install_notify_handler(handle,
1035                                             ACPI_SYSTEM_NOTIFY,
1036                                             acpi_processor_hotplug_notify,
1037                                             NULL);
1038                 break;
1039         case UNINSTALL_NOTIFY_HANDLER:
1040                 acpi_remove_notify_handler(handle,
1041                                            ACPI_SYSTEM_NOTIFY,
1042                                            acpi_processor_hotplug_notify);
1043                 break;
1044         default:
1045                 break;
1046         }
1047
1048         return (AE_OK);
1049 }
1050
1051 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1052 {
1053
1054         if (!is_processor_present(handle)) {
1055                 return AE_ERROR;
1056         }
1057
1058         if (acpi_map_lsapic(handle, p_cpu))
1059                 return AE_ERROR;
1060
1061         if (arch_register_cpu(*p_cpu)) {
1062                 acpi_unmap_lsapic(*p_cpu);
1063                 return AE_ERROR;
1064         }
1065
1066         return AE_OK;
1067 }
1068
1069 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1070 {
1071         if (cpu_online(pr->id))
1072                 cpu_down(pr->id);
1073
1074         arch_unregister_cpu(pr->id);
1075         acpi_unmap_lsapic(pr->id);
1076         return (0);
1077 }
1078 #else
1079 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1080 {
1081         return AE_ERROR;
1082 }
1083 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1084 {
1085         return (-EINVAL);
1086 }
1087 #endif
1088
1089 static
1090 void acpi_processor_install_hotplug_notify(void)
1091 {
1092 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1093         int action = INSTALL_NOTIFY_HANDLER;
1094         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1095                             ACPI_ROOT_OBJECT,
1096                             ACPI_UINT32_MAX,
1097                             processor_walk_namespace_cb, &action, NULL);
1098 #endif
1099         register_hotcpu_notifier(&acpi_cpu_notifier);
1100 }
1101
1102 static
1103 void acpi_processor_uninstall_hotplug_notify(void)
1104 {
1105 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1106         int action = UNINSTALL_NOTIFY_HANDLER;
1107         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1108                             ACPI_ROOT_OBJECT,
1109                             ACPI_UINT32_MAX,
1110                             processor_walk_namespace_cb, &action, NULL);
1111 #endif
1112         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1113 }
1114
1115 /*
1116  * We keep the driver loaded even when ACPI is not running.
1117  * This is needed for the powernow-k8 driver, that works even without
1118  * ACPI, but needs symbols from this driver
1119  */
1120
1121 static int __init acpi_processor_init(void)
1122 {
1123         int result = 0;
1124
1125         memset(&errata, 0, sizeof(errata));
1126
1127 #ifdef CONFIG_SMP
1128         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1129                                 (struct acpi_table_header **)&madt)))
1130                 madt = NULL;
1131 #endif
1132
1133         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1134         if (!acpi_processor_dir)
1135                 return -ENOMEM;
1136
1137         /*
1138          * Check whether the system is DMI table. If yes, OSPM
1139          * should not use mwait for CPU-states.
1140          */
1141         dmi_check_system(processor_idle_dmi_table);
1142         result = cpuidle_register_driver(&acpi_idle_driver);
1143         if (result < 0)
1144                 goto out_proc;
1145
1146         result = acpi_bus_register_driver(&acpi_processor_driver);
1147         if (result < 0)
1148                 goto out_cpuidle;
1149
1150         acpi_processor_install_hotplug_notify();
1151
1152         acpi_thermal_cpufreq_init();
1153
1154         acpi_processor_ppc_init();
1155
1156         acpi_processor_throttling_init();
1157
1158         return 0;
1159
1160 out_cpuidle:
1161         cpuidle_unregister_driver(&acpi_idle_driver);
1162
1163 out_proc:
1164         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1165
1166         return result;
1167 }
1168
1169 static void __exit acpi_processor_exit(void)
1170 {
1171         acpi_processor_ppc_exit();
1172
1173         acpi_thermal_cpufreq_exit();
1174
1175         acpi_processor_uninstall_hotplug_notify();
1176
1177         acpi_bus_unregister_driver(&acpi_processor_driver);
1178
1179         cpuidle_unregister_driver(&acpi_idle_driver);
1180
1181         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1182
1183         return;
1184 }
1185
1186 module_init(acpi_processor_init);
1187 module_exit(acpi_processor_exit);
1188
1189 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1190
1191 MODULE_ALIAS("processor");