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
  48 #include <asm/io.h>
  49 #include <asm/system.h>
  50 #include <asm/cpu.h>
  51 #include <asm/delay.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54 #include <asm/smp.h>
  55 #include <asm/acpi.h>
  56
  57 #include <acpi/acpi_bus.h>
  58 #include <acpi/acpi_drivers.h>
  59 #include <acpi/processor.h>
  60
  61 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  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 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
  89
  90
  91 static const struct acpi_device_id processor_device_ids[] = {
  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                 },
 106 };
 107
 108 #define INSTALL_NOTIFY_HANDLER          1
 109 #define UNINSTALL_NOTIFY_HANDLER        2
 110
 111 static const struct file_operations acpi_processor_info_fops = {
 112         .open = acpi_processor_info_open_fs,
 113         .read = seq_read,
 114         .llseek = seq_lseek,
 115         .release = single_release,
 116 };
 117
 118 struct acpi_processor *processors[NR_CPUS];
 119 struct acpi_processor_errata errata __read_mostly;
 120
 121 /* --------------------------------------------------------------------------
 122                                 Errata Handling
 123    -------------------------------------------------------------------------- */
 124
 125 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 126 {
 127         u8 value1 = 0;
 128         u8 value2 = 0;
 129
 130
 131         if (!dev)
 132                 return -EINVAL;
 133
 134         /*
 135          * Note that 'dev' references the PIIX4 ACPI Controller.
 136          */
 137
 138         switch (dev->revision) {
 139         case 0:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 141                 break;
 142         case 1:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 144                 break;
 145         case 2:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 147                 break;
 148         case 3:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 150                 break;
 151         default:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 153                 break;
 154         }
 155
 156         switch (dev->revision) {
 157
 158         case 0:         /* PIIX4 A-step */
 159         case 1:         /* PIIX4 B-step */
 160                 /*
 161                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 162                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 163                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 164                  * 2002 PIIX4 specification update.  Applies to only older
 165                  * PIIX4 models.
 166                  */
 167                 errata.piix4.throttle = 1;
 168
 169         case 2:         /* PIIX4E */
 170         case 3:         /* PIIX4M */
 171                 /*
 172                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 173                  * Livelock") from the January 2002 PIIX4 specification update.
 174                  * Applies to all PIIX4 models.
 175                  */
 176
 177                 /*
 178                  * BM-IDE
 179                  * ------
 180                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 181                  * Status register address.  We'll use this later to read
 182                  * each IDE controller's DMA status to make sure we catch all
 183                  * DMA activity.
 184                  */
 185                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 186                                      PCI_DEVICE_ID_INTEL_82371AB,
 187                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 188                 if (dev) {
 189                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 190                         pci_dev_put(dev);
 191                 }
 192
 193                 /*
 194                  * Type-F DMA
 195                  * ----------
 196                  * Find the PIIX4 ISA Controller and read the Motherboard
 197                  * DMA controller's status to see if Type-F (Fast) DMA mode
 198                  * is enabled (bit 7) on either channel.  Note that we'll
 199                  * disable C3 support if this is enabled, as some legacy
 200                  * devices won't operate well if fast DMA is disabled.
 201                  */
 202                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 203                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 204                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 205                 if (dev) {
 206                         pci_read_config_byte(dev, 0x76, &value1);
 207                         pci_read_config_byte(dev, 0x77, &value2);
 208                         if ((value1 & 0x80) || (value2 & 0x80))
 209                                 errata.piix4.fdma = 1;
 210                         pci_dev_put(dev);
 211                 }
 212
 213                 break;
 214         }
 215
 216         if (errata.piix4.bmisx)
 217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 218                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 219         if (errata.piix4.fdma)
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 221                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 222
 223         return 0;
 224 }
 225
 226 static int acpi_processor_errata(struct acpi_processor *pr)
 227 {
 228         int result = 0;
 229         struct pci_dev *dev = NULL;
 230
 231
 232         if (!pr)
 233                 return -EINVAL;
 234
 235         /*
 236          * PIIX4
 237          */
 238         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 239                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 240                              PCI_ANY_ID, NULL);
 241         if (dev) {
 242                 result = acpi_processor_errata_piix4(dev);
 243                 pci_dev_put(dev);
 244         }
 245
 246         return result;
 247 }
 248
 249 /* --------------------------------------------------------------------------
 250                               Common ACPI processor functions
 251    -------------------------------------------------------------------------- */
 252
 253 /*
 254  * _PDC is required for a BIOS-OS handshake for most of the newer
 255  * ACPI processor features.
 256  */
 257 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 258 {
 259         struct acpi_object_list *pdc_in = pr->pdc;
 260         acpi_status status = AE_OK;
 261
 262
 263         if (!pdc_in)
 264                 return status;
 265
 266         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 267
 268         if (ACPI_FAILURE(status))
 269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 270                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 271
 272         return status;
 273 }
 274
 275 /* --------------------------------------------------------------------------
 276                               FS Interface (/proc)
 277    -------------------------------------------------------------------------- */
 278
 279 static struct proc_dir_entry *acpi_processor_dir = NULL;
 280
 281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 282 {
 283         struct acpi_processor *pr = seq->private;
 284
 285
 286         if (!pr)
 287                 goto end;
 288
 289         seq_printf(seq, "processor id:            %d\n"
 290                    "acpi id:                 %d\n"
 291                    "bus mastering control:   %s\n"
 292                    "power management:        %s\n"
 293                    "throttling control:      %s\n"
 294                    "limit interface:         %s\n",
 295                    pr->id,
 296                    pr->acpi_id,
 297                    pr->flags.bm_control ? "yes" : "no",
 298                    pr->flags.power ? "yes" : "no",
 299                    pr->flags.throttling ? "yes" : "no",
 300                    pr->flags.limit ? "yes" : "no");
 301
 302       end:
 303         return 0;
 304 }
 305
 306 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 307 {
 308         return single_open(file, acpi_processor_info_seq_show,
 309                            PDE(inode)->data);
 310 }
 311
 312 static int acpi_processor_add_fs(struct acpi_device *device)
 313 {
 314         struct proc_dir_entry *entry = NULL;
 315
 316
 317         if (!acpi_device_dir(device)) {
 318                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 319                                                      acpi_processor_dir);
 320                 if (!acpi_device_dir(device))
 321                         return -ENODEV;
 322         }
 323         acpi_device_dir(device)->owner = THIS_MODULE;
 324
 325         /* 'info' [R] */
 326         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 327                                   S_IRUGO, acpi_device_dir(device));
 328         if (!entry)
 329                 return -EIO;
 330         else {
 331                 entry->proc_fops = &acpi_processor_info_fops;
 332                 entry->data = acpi_driver_data(device);
 333                 entry->owner = THIS_MODULE;
 334         }
 335
 336         /* 'throttling' [R/W] */
 337         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 338                                   S_IFREG | S_IRUGO | S_IWUSR,
 339                                   acpi_device_dir(device));
 340         if (!entry)
 341                 return -EIO;
 342         else {
 343                 entry->proc_fops = &acpi_processor_throttling_fops;
 344                 entry->data = acpi_driver_data(device);
 345                 entry->owner = THIS_MODULE;
 346         }
 347
 348         /* 'limit' [R/W] */
 349         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 350                                   S_IFREG | S_IRUGO | S_IWUSR,
 351                                   acpi_device_dir(device));
 352         if (!entry)
 353                 return -EIO;
 354         else {
 355                 entry->proc_fops = &acpi_processor_limit_fops;
 356                 entry->data = acpi_driver_data(device);
 357                 entry->owner = THIS_MODULE;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int acpi_processor_remove_fs(struct acpi_device *device)
 364 {
 365
 366         if (acpi_device_dir(device)) {
 367                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 368                                   acpi_device_dir(device));
 369                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 370                                   acpi_device_dir(device));
 371                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 372                                   acpi_device_dir(device));
 373                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 374                 acpi_device_dir(device) = NULL;
 375         }
 376
 377         return 0;
 378 }
 379
 380 /* Use the acpiid in MADT to map cpus in case of SMP */
 381
 382 #ifndef CONFIG_SMP
 383 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 384 #else
 385
 386 static struct acpi_table_madt *madt;
 387
 388 static int map_lapic_id(struct acpi_subtable_header *entry,
 389                  u32 acpi_id, int *apic_id)
 390 {
 391         struct acpi_madt_local_apic *lapic =
 392                 (struct acpi_madt_local_apic *)entry;
 393         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 394             lapic->processor_id == acpi_id) {
 395                 *apic_id = lapic->id;
 396                 return 1;
 397         }
 398         return 0;
 399 }
 400
 401 static int map_lsapic_id(struct acpi_subtable_header *entry,
 402                   u32 acpi_id, int *apic_id)
 403 {
 404         struct acpi_madt_local_sapic *lsapic =
 405                 (struct acpi_madt_local_sapic *)entry;
 406         /* Only check enabled APICs*/
 407         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 408                 /* First check against id */
 409                 if (lsapic->processor_id == acpi_id) {
 410                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 411                         return 1;
 412                 /* Check against optional uid */
 413                 } else if (entry->length >= 16 &&
 414                         lsapic->uid == acpi_id) {
 415                         *apic_id = lsapic->uid;
 416                         return 1;
 417                 }
 418         }
 419         return 0;
 420 }
 421
 422 #ifdef CONFIG_IA64
 423 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 424 #else
 425 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 426 #endif
 427
 428 static int map_madt_entry(u32 acpi_id)
 429 {
 430         unsigned long madt_end, entry;
 431         int apic_id = -1;
 432
 433         if (!madt)
 434                 return apic_id;
 435
 436         entry = (unsigned long)madt;
 437         madt_end = entry + madt->header.length;
 438
 439         /* Parse all entries looking for a match. */
 440
 441         entry += sizeof(struct acpi_table_madt);
 442         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 443                 struct acpi_subtable_header *header =
 444                         (struct acpi_subtable_header *)entry;
 445                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 446                         if (map_lapic_id(header, acpi_id, &apic_id))
 447                                 break;
 448                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 449                         if (map_lsapic_id(header, acpi_id, &apic_id))
 450                                 break;
 451                 }
 452                 entry += header->length;
 453         }
 454         return apic_id;
 455 }
 456
 457 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 458 {
 459         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 460         union acpi_object *obj;
 461         struct acpi_subtable_header *header;
 462         int apic_id = -1;
 463
 464         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 465                 goto exit;
 466
 467         if (!buffer.length || !buffer.pointer)
 468                 goto exit;
 469
 470         obj = buffer.pointer;
 471         if (obj->type != ACPI_TYPE_BUFFER ||
 472             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 473                 goto exit;
 474         }
 475
 476         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 477         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 478                 map_lapic_id(header, acpi_id, &apic_id);
 479         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 480                 map_lsapic_id(header, acpi_id, &apic_id);
 481         }
 482
 483 exit:
 484         if (buffer.pointer)
 485                 kfree(buffer.pointer);
 486         return apic_id;
 487 }
 488
 489 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 490 {
 491         int i;
 492         int apic_id = -1;
 493
 494         apic_id = map_mat_entry(handle, acpi_id);
 495         if (apic_id == -1)
 496                 apic_id = map_madt_entry(acpi_id);
 497         if (apic_id == -1)
 498                 return apic_id;
 499
 500         for (i = 0; i < NR_CPUS; ++i) {
 501                 if (arch_cpu_to_apicid[i] == apic_id)
 502                         return i;
 503         }
 504         return -1;
 505 }
 506 #endif
 507
 508 /* --------------------------------------------------------------------------
 509                                  Driver Interface
 510    -------------------------------------------------------------------------- */
 511
 512 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 513 {
 514         acpi_status status = 0;
 515         union acpi_object object = { 0 };
 516         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 517         int cpu_index;
 518         static int cpu0_initialized;
 519
 520
 521         if (!pr)
 522                 return -EINVAL;
 523
 524         if (num_online_cpus() > 1)
 525                 errata.smp = TRUE;
 526
 527         acpi_processor_errata(pr);
 528
 529         /*
 530          * Check to see if we have bus mastering arbitration control.  This
 531          * is required for proper C3 usage (to maintain cache coherency).
 532          */
 533         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 534                 pr->flags.bm_control = 1;
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "Bus mastering arbitration control present\n"));
 537         } else
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                                   "No bus mastering arbitration control\n"));
 540
 541         /* Check if it is a Device with HID and UID */
 542         if (has_uid) {
 543                 unsigned long value;
 544                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 545                                                 NULL, &value);
 546                 if (ACPI_FAILURE(status)) {
 547                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 548                         return -ENODEV;
 549                 }
 550                 pr->acpi_id = value;
 551         } else {
 552                 /*
 553                 * Evalute the processor object.  Note that it is common on SMP to
 554                 * have the first (boot) processor with a valid PBLK address while
 555                 * all others have a NULL address.
 556                 */
 557                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 558                 if (ACPI_FAILURE(status)) {
 559                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 560                         return -ENODEV;
 561                 }
 562
 563                 /*
 564                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 565                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 566                 */
 567                 pr->acpi_id = object.processor.proc_id;
 568         }
 569         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 570
 571         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 572         if (!cpu0_initialized && (cpu_index == -1) &&
 573             (num_online_cpus() == 1)) {
 574                 cpu_index = 0;
 575         }
 576
 577         cpu0_initialized = 1;
 578
 579         pr->id = cpu_index;
 580
 581         /*
 582          *  Extra Processor objects may be enumerated on MP systems with
 583          *  less than the max # of CPUs. They should be ignored _iff
 584          *  they are physically not present.
 585          */
 586         if (pr->id == -1) {
 587                 if (ACPI_FAILURE
 588                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 589                         return -ENODEV;
 590                 }
 591         }
 592
 593         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 594                           pr->acpi_id));
 595
 596         if (!object.processor.pblk_address)
 597                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 598         else if (object.processor.pblk_length != 6)
 599                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 600                             object.processor.pblk_length);
 601         else {
 602                 pr->throttling.address = object.processor.pblk_address;
 603                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 604                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 605
 606                 pr->pblk = object.processor.pblk_address;
 607
 608                 /*
 609                  * We don't care about error returns - we just try to mark
 610                  * these reserved so that nobody else is confused into thinking
 611                  * that this region might be unused..
 612                  *
 613                  * (In particular, allocating the IO range for Cardbus)
 614                  */
 615                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 616         }
 617
 618 #ifdef CONFIG_CPU_FREQ
 619         acpi_processor_ppc_has_changed(pr);
 620 #endif
 621         acpi_processor_get_throttling_info(pr);
 622         acpi_processor_get_limit_info(pr);
 623
 624         return 0;
 625 }
 626
 627 static void *processor_device_array[NR_CPUS];
 628
 629 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 630 {
 631         int result = 0;
 632         acpi_status status = AE_OK;
 633         struct acpi_processor *pr;
 634
 635
 636         pr = acpi_driver_data(device);
 637
 638         result = acpi_processor_get_info(pr, device->flags.unique_id);
 639         if (result) {
 640                 /* Processor is physically not present */
 641                 return 0;
 642         }
 643
 644         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 645
 646         /*
 647          * Buggy BIOS check
 648          * ACPI id of processors can be reported wrongly by the BIOS.
 649          * Don't trust it blindly
 650          */
 651         if (processor_device_array[pr->id] != NULL &&
 652             processor_device_array[pr->id] != device) {
 653                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 654                         "for the processor\n");
 655                 return -ENODEV;
 656         }
 657         processor_device_array[pr->id] = device;
 658
 659         processors[pr->id] = pr;
 660
 661         result = acpi_processor_add_fs(device);
 662         if (result)
 663                 goto end;
 664
 665         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 666                                              acpi_processor_notify, pr);
 667
 668         /* _PDC call should be done before doing anything else (if reqd.). */
 669         arch_acpi_processor_init_pdc(pr);
 670         acpi_processor_set_pdc(pr);
 671
 672         acpi_processor_power_init(pr, device);
 673
 674         if (pr->flags.throttling) {
 675                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 676                        acpi_device_name(device), acpi_device_bid(device));
 677                 printk(" %d throttling states", pr->throttling.state_count);
 678                 printk(")\n");
 679         }
 680
 681       end:
 682
 683         return result;
 684 }
 685
 686 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 687 {
 688         struct acpi_processor *pr = data;
 689         struct acpi_device *device = NULL;
 690
 691
 692         if (!pr)
 693                 return;
 694
 695         if (acpi_bus_get_device(pr->handle, &device))
 696                 return;
 697
 698         switch (event) {
 699         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 700                 acpi_processor_ppc_has_changed(pr);
 701                 acpi_bus_generate_event(device, event,
 702                                         pr->performance_platform_limit);
 703                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 704                                                   device->dev.bus_id, event,
 705                                                   pr->performance_platform_limit);
 706                 break;
 707         case ACPI_PROCESSOR_NOTIFY_POWER:
 708                 acpi_processor_cst_has_changed(pr);
 709                 acpi_bus_generate_event(device, event, 0);
 710                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 711                                                   device->dev.bus_id, event, 0);
 712                 break;
 713         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 714                 acpi_processor_tstate_has_changed(pr);
 715                 acpi_bus_generate_event(device, event, 0);
 716                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 717                                                   device->dev.bus_id, event, 0);
 718         default:
 719                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 720                                   "Unsupported event [0x%x]\n", event));
 721                 break;
 722         }
 723
 724         return;
 725 }
 726
 727 static int acpi_processor_add(struct acpi_device *device)
 728 {
 729         struct acpi_processor *pr = NULL;
 730
 731
 732         if (!device)
 733                 return -EINVAL;
 734
 735         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 736         if (!pr)
 737                 return -ENOMEM;
 738
 739         pr->handle = device->handle;
 740         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 741         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 742         acpi_driver_data(device) = pr;
 743
 744         return 0;
 745 }
 746
 747 static int acpi_processor_remove(struct acpi_device *device, int type)
 748 {
 749         acpi_status status = AE_OK;
 750         struct acpi_processor *pr = NULL;
 751
 752
 753         if (!device || !acpi_driver_data(device))
 754                 return -EINVAL;
 755
 756         pr = acpi_driver_data(device);
 757
 758         if (pr->id >= NR_CPUS) {
 759                 kfree(pr);
 760                 return 0;
 761         }
 762
 763         if (type == ACPI_BUS_REMOVAL_EJECT) {
 764                 if (acpi_processor_handle_eject(pr))
 765                         return -EINVAL;
 766         }
 767
 768         acpi_processor_power_exit(pr, device);
 769
 770         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 771                                             acpi_processor_notify);
 772
 773         acpi_processor_remove_fs(device);
 774
 775         processors[pr->id] = NULL;
 776
 777         kfree(pr);
 778
 779         return 0;
 780 }
 781
 782 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 783 /****************************************************************************
 784  *      Acpi processor hotplug support                                      *
 785  ****************************************************************************/
 786
 787 static int is_processor_present(acpi_handle handle);
 788
 789 static int is_processor_present(acpi_handle handle)
 790 {
 791         acpi_status status;
 792         unsigned long sta = 0;
 793
 794
 795         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 796         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 797                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 798                 return 0;
 799         }
 800         return 1;
 801 }
 802
 803 static
 804 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 805 {
 806         acpi_handle phandle;
 807         struct acpi_device *pdev;
 808         struct acpi_processor *pr;
 809
 810
 811         if (acpi_get_parent(handle, &phandle)) {
 812                 return -ENODEV;
 813         }
 814
 815         if (acpi_bus_get_device(phandle, &pdev)) {
 816                 return -ENODEV;
 817         }
 818
 819         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 820                 return -ENODEV;
 821         }
 822
 823         acpi_bus_start(*device);
 824
 825         pr = acpi_driver_data(*device);
 826         if (!pr)
 827                 return -ENODEV;
 828
 829         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 830                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 831         }
 832         return 0;
 833 }
 834
 835 static void
 836 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 837 {
 838         struct acpi_processor *pr;
 839         struct acpi_device *device = NULL;
 840         int result;
 841
 842
 843         switch (event) {
 844         case ACPI_NOTIFY_BUS_CHECK:
 845         case ACPI_NOTIFY_DEVICE_CHECK:
 846                 printk("Processor driver received %s event\n",
 847                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 848                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 849
 850                 if (!is_processor_present(handle))
 851                         break;
 852
 853                 if (acpi_bus_get_device(handle, &device)) {
 854                         result = acpi_processor_device_add(handle, &device);
 855                         if (result)
 856                                 printk(KERN_ERR PREFIX
 857                                             "Unable to add the device\n");
 858                         break;
 859                 }
 860
 861                 pr = acpi_driver_data(device);
 862                 if (!pr) {
 863                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 864                         break;
 865                 }
 866
 867                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 868                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 869                         break;
 870                 }
 871
 872                 result = acpi_processor_start(device);
 873                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 874                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 875                 } else {
 876                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 877                                     acpi_device_bid(device));
 878                 }
 879                 break;
 880         case ACPI_NOTIFY_EJECT_REQUEST:
 881                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 882                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 883
 884                 if (acpi_bus_get_device(handle, &device)) {
 885                         printk(KERN_ERR PREFIX
 886                                     "Device don't exist, dropping EJECT\n");
 887                         break;
 888                 }
 889                 pr = acpi_driver_data(device);
 890                 if (!pr) {
 891                         printk(KERN_ERR PREFIX
 892                                     "Driver data is NULL, dropping EJECT\n");
 893                         return;
 894                 }
 895
 896                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 897                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 898                 break;
 899         default:
 900                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 901                                   "Unsupported event [0x%x]\n", event));
 902                 break;
 903         }
 904
 905         return;
 906 }
 907
 908 static acpi_status
 909 processor_walk_namespace_cb(acpi_handle handle,
 910                             u32 lvl, void *context, void **rv)
 911 {
 912         acpi_status status;
 913         int *action = context;
 914         acpi_object_type type = 0;
 915
 916         status = acpi_get_type(handle, &type);
 917         if (ACPI_FAILURE(status))
 918                 return (AE_OK);
 919
 920         if (type != ACPI_TYPE_PROCESSOR)
 921                 return (AE_OK);
 922
 923         switch (*action) {
 924         case INSTALL_NOTIFY_HANDLER:
 925                 acpi_install_notify_handler(handle,
 926                                             ACPI_SYSTEM_NOTIFY,
 927                                             acpi_processor_hotplug_notify,
 928                                             NULL);
 929                 break;
 930         case UNINSTALL_NOTIFY_HANDLER:
 931                 acpi_remove_notify_handler(handle,
 932                                            ACPI_SYSTEM_NOTIFY,
 933                                            acpi_processor_hotplug_notify);
 934                 break;
 935         default:
 936                 break;
 937         }
 938
 939         return (AE_OK);
 940 }
 941
 942 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 943 {
 944
 945         if (!is_processor_present(handle)) {
 946                 return AE_ERROR;
 947         }
 948
 949         if (acpi_map_lsapic(handle, p_cpu))
 950                 return AE_ERROR;
 951
 952         if (arch_register_cpu(*p_cpu)) {
 953                 acpi_unmap_lsapic(*p_cpu);
 954                 return AE_ERROR;
 955         }
 956
 957         return AE_OK;
 958 }
 959
 960 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 961 {
 962         if (cpu_online(pr->id)) {
 963                 return (-EINVAL);
 964         }
 965         arch_unregister_cpu(pr->id);
 966         acpi_unmap_lsapic(pr->id);
 967         return (0);
 968 }
 969 #else
 970 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 971 {
 972         return AE_ERROR;
 973 }
 974 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 975 {
 976         return (-EINVAL);
 977 }
 978 #endif
 979
 980 static
 981 void acpi_processor_install_hotplug_notify(void)
 982 {
 983 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 984         int action = INSTALL_NOTIFY_HANDLER;
 985         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 986                             ACPI_ROOT_OBJECT,
 987                             ACPI_UINT32_MAX,
 988                             processor_walk_namespace_cb, &action, NULL);
 989 #endif
 990 }
 991
 992 static
 993 void acpi_processor_uninstall_hotplug_notify(void)
 994 {
 995 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 996         int action = UNINSTALL_NOTIFY_HANDLER;
 997         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 998                             ACPI_ROOT_OBJECT,
 999                             ACPI_UINT32_MAX,
1000                             processor_walk_namespace_cb, &action, NULL);
1001 #endif
1002 }
1003
1004 /*
1005  * We keep the driver loaded even when ACPI is not running.
1006  * This is needed for the powernow-k8 driver, that works even without
1007  * ACPI, but needs symbols from this driver
1008  */
1009
1010 static int __init acpi_processor_init(void)
1011 {
1012         int result = 0;
1013
1014
1015         memset(&processors, 0, sizeof(processors));
1016         memset(&errata, 0, sizeof(errata));
1017
1018 #ifdef CONFIG_SMP
1019         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1020                                 (struct acpi_table_header **)&madt)))
1021                 madt = NULL;
1022 #endif
1023
1024         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1025         if (!acpi_processor_dir)
1026                 return -ENOMEM;
1027         acpi_processor_dir->owner = THIS_MODULE;
1028
1029         result = acpi_bus_register_driver(&acpi_processor_driver);
1030         if (result < 0) {
1031                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1032                 return result;
1033         }
1034
1035         acpi_processor_install_hotplug_notify();
1036
1037         acpi_thermal_cpufreq_init();
1038
1039         acpi_processor_ppc_init();
1040
1041         return 0;
1042 }
1043
1044 static void __exit acpi_processor_exit(void)
1045 {
1046
1047         acpi_processor_ppc_exit();
1048
1049         acpi_thermal_cpufreq_exit();
1050
1051         acpi_processor_uninstall_hotplug_notify();
1052
1053         acpi_bus_unregister_driver(&acpi_processor_driver);
1054
1055         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1056
1057         return;
1058 }
1059
1060 module_init(acpi_processor_init);
1061 module_exit(acpi_processor_exit);
1062
1063 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1064
1065 MODULE_ALIAS("processor");