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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_COMPONENT        0x01000000
  63 #define ACPI_PROCESSOR_CLASS            "processor"
  64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  65 #define ACPI_PROCESSOR_FILE_INFO        "info"
  66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  71
  72 #define ACPI_PROCESSOR_LIMIT_USER       0
  73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  74
  75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  76 ACPI_MODULE_NAME("processor_core");
  77
  78 MODULE_AUTHOR("Paul Diefenbaugh");
  79 MODULE_DESCRIPTION("ACPI Processor Driver");
  80 MODULE_LICENSE("GPL");
  81
  82 static int acpi_processor_add(struct acpi_device *device);
  83 static int acpi_processor_start(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  89 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
  90
  91
  92 static const struct acpi_device_id processor_device_ids[] = {
  93         {ACPI_PROCESSOR_HID, 0},
  94         {"", 0},
  95 };
  96 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  97
  98 static struct acpi_driver acpi_processor_driver = {
  99         .name = "processor",
 100         .class = ACPI_PROCESSOR_CLASS,
 101         .ids = processor_device_ids,
 102         .ops = {
 103                 .add = acpi_processor_add,
 104                 .remove = acpi_processor_remove,
 105                 .start = acpi_processor_start,
 106                 .suspend = acpi_processor_suspend,
 107                 .resume = acpi_processor_resume,
 108                 },
 109 };
 110
 111 #define INSTALL_NOTIFY_HANDLER          1
 112 #define UNINSTALL_NOTIFY_HANDLER        2
 113
 114 static const struct file_operations acpi_processor_info_fops = {
 115         .open = acpi_processor_info_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 struct acpi_processor *processors[NR_CPUS];
 122 struct acpi_processor_errata errata __read_mostly;
 123
 124 /* --------------------------------------------------------------------------
 125                                 Errata Handling
 126    -------------------------------------------------------------------------- */
 127
 128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 129 {
 130         u8 value1 = 0;
 131         u8 value2 = 0;
 132
 133
 134         if (!dev)
 135                 return -EINVAL;
 136
 137         /*
 138          * Note that 'dev' references the PIIX4 ACPI Controller.
 139          */
 140
 141         switch (dev->revision) {
 142         case 0:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 144                 break;
 145         case 1:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 147                 break;
 148         case 2:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 150                 break;
 151         case 3:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 153                 break;
 154         default:
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 156                 break;
 157         }
 158
 159         switch (dev->revision) {
 160
 161         case 0:         /* PIIX4 A-step */
 162         case 1:         /* PIIX4 B-step */
 163                 /*
 164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 167                  * 2002 PIIX4 specification update.  Applies to only older
 168                  * PIIX4 models.
 169                  */
 170                 errata.piix4.throttle = 1;
 171
 172         case 2:         /* PIIX4E */
 173         case 3:         /* PIIX4M */
 174                 /*
 175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 176                  * Livelock") from the January 2002 PIIX4 specification update.
 177                  * Applies to all PIIX4 models.
 178                  */
 179
 180                 /*
 181                  * BM-IDE
 182                  * ------
 183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 184                  * Status register address.  We'll use this later to read
 185                  * each IDE controller's DMA status to make sure we catch all
 186                  * DMA activity.
 187                  */
 188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 189                                      PCI_DEVICE_ID_INTEL_82371AB,
 190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 191                 if (dev) {
 192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 193                         pci_dev_put(dev);
 194                 }
 195
 196                 /*
 197                  * Type-F DMA
 198                  * ----------
 199                  * Find the PIIX4 ISA Controller and read the Motherboard
 200                  * DMA controller's status to see if Type-F (Fast) DMA mode
 201                  * is enabled (bit 7) on either channel.  Note that we'll
 202                  * disable C3 support if this is enabled, as some legacy
 203                  * devices won't operate well if fast DMA is disabled.
 204                  */
 205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 208                 if (dev) {
 209                         pci_read_config_byte(dev, 0x76, &value1);
 210                         pci_read_config_byte(dev, 0x77, &value2);
 211                         if ((value1 & 0x80) || (value2 & 0x80))
 212                                 errata.piix4.fdma = 1;
 213                         pci_dev_put(dev);
 214                 }
 215
 216                 break;
 217         }
 218
 219         if (errata.piix4.bmisx)
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 222         if (errata.piix4.fdma)
 223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 225
 226         return 0;
 227 }
 228
 229 static int acpi_processor_errata(struct acpi_processor *pr)
 230 {
 231         int result = 0;
 232         struct pci_dev *dev = NULL;
 233
 234
 235         if (!pr)
 236                 return -EINVAL;
 237
 238         /*
 239          * PIIX4
 240          */
 241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 243                              PCI_ANY_ID, NULL);
 244         if (dev) {
 245                 result = acpi_processor_errata_piix4(dev);
 246                 pci_dev_put(dev);
 247         }
 248
 249         return result;
 250 }
 251
 252 /* --------------------------------------------------------------------------
 253                               Common ACPI processor functions
 254    -------------------------------------------------------------------------- */
 255
 256 /*
 257  * _PDC is required for a BIOS-OS handshake for most of the newer
 258  * ACPI processor features.
 259  */
 260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 261 {
 262         struct acpi_object_list *pdc_in = pr->pdc;
 263         acpi_status status = AE_OK;
 264
 265
 266         if (!pdc_in)
 267                 return status;
 268
 269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 270
 271         if (ACPI_FAILURE(status))
 272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 274
 275         return status;
 276 }
 277
 278 /* --------------------------------------------------------------------------
 279                               FS Interface (/proc)
 280    -------------------------------------------------------------------------- */
 281
 282 static struct proc_dir_entry *acpi_processor_dir = NULL;
 283
 284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 285 {
 286         struct acpi_processor *pr = seq->private;
 287
 288
 289         if (!pr)
 290                 goto end;
 291
 292         seq_printf(seq, "processor id:            %d\n"
 293                    "acpi id:                 %d\n"
 294                    "bus mastering control:   %s\n"
 295                    "power management:        %s\n"
 296                    "throttling control:      %s\n"
 297                    "limit interface:         %s\n",
 298                    pr->id,
 299                    pr->acpi_id,
 300                    pr->flags.bm_control ? "yes" : "no",
 301                    pr->flags.power ? "yes" : "no",
 302                    pr->flags.throttling ? "yes" : "no",
 303                    pr->flags.limit ? "yes" : "no");
 304
 305       end:
 306         return 0;
 307 }
 308
 309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 310 {
 311         return single_open(file, acpi_processor_info_seq_show,
 312                            PDE(inode)->data);
 313 }
 314
 315 static int acpi_processor_add_fs(struct acpi_device *device)
 316 {
 317         struct proc_dir_entry *entry = NULL;
 318
 319
 320         if (!acpi_device_dir(device)) {
 321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 322                                                      acpi_processor_dir);
 323                 if (!acpi_device_dir(device))
 324                         return -ENODEV;
 325         }
 326         acpi_device_dir(device)->owner = THIS_MODULE;
 327
 328         /* 'info' [R] */
 329         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 330                                   S_IRUGO, acpi_device_dir(device));
 331         if (!entry)
 332                 return -EIO;
 333         else {
 334                 entry->proc_fops = &acpi_processor_info_fops;
 335                 entry->data = acpi_driver_data(device);
 336                 entry->owner = THIS_MODULE;
 337         }
 338
 339         /* 'throttling' [R/W] */
 340         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 341                                   S_IFREG | S_IRUGO | S_IWUSR,
 342                                   acpi_device_dir(device));
 343         if (!entry)
 344                 return -EIO;
 345         else {
 346                 entry->proc_fops = &acpi_processor_throttling_fops;
 347                 entry->data = acpi_driver_data(device);
 348                 entry->owner = THIS_MODULE;
 349         }
 350
 351         /* 'limit' [R/W] */
 352         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 353                                   S_IFREG | S_IRUGO | S_IWUSR,
 354                                   acpi_device_dir(device));
 355         if (!entry)
 356                 return -EIO;
 357         else {
 358                 entry->proc_fops = &acpi_processor_limit_fops;
 359                 entry->data = acpi_driver_data(device);
 360                 entry->owner = THIS_MODULE;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int acpi_processor_remove_fs(struct acpi_device *device)
 367 {
 368
 369         if (acpi_device_dir(device)) {
 370                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 371                                   acpi_device_dir(device));
 372                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 373                                   acpi_device_dir(device));
 374                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 375                                   acpi_device_dir(device));
 376                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 377                 acpi_device_dir(device) = NULL;
 378         }
 379
 380         return 0;
 381 }
 382
 383 /* Use the acpiid in MADT to map cpus in case of SMP */
 384
 385 #ifndef CONFIG_SMP
 386 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 387 #else
 388
 389 static struct acpi_table_madt *madt;
 390
 391 static int map_lapic_id(struct acpi_subtable_header *entry,
 392                  u32 acpi_id, int *apic_id)
 393 {
 394         struct acpi_madt_local_apic *lapic =
 395                 (struct acpi_madt_local_apic *)entry;
 396         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 397             lapic->processor_id == acpi_id) {
 398                 *apic_id = lapic->id;
 399                 return 1;
 400         }
 401         return 0;
 402 }
 403
 404 static int map_lsapic_id(struct acpi_subtable_header *entry,
 405                   u32 acpi_id, int *apic_id)
 406 {
 407         struct acpi_madt_local_sapic *lsapic =
 408                 (struct acpi_madt_local_sapic *)entry;
 409         /* Only check enabled APICs*/
 410         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 411                 /* First check against id */
 412                 if (lsapic->processor_id == acpi_id) {
 413                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 414                         return 1;
 415                 /* Check against optional uid */
 416                 } else if (entry->length >= 16 &&
 417                         lsapic->uid == acpi_id) {
 418                         *apic_id = lsapic->uid;
 419                         return 1;
 420                 }
 421         }
 422         return 0;
 423 }
 424
 425 static int map_madt_entry(u32 acpi_id)
 426 {
 427         unsigned long madt_end, entry;
 428         int apic_id = -1;
 429
 430         if (!madt)
 431                 return apic_id;
 432
 433         entry = (unsigned long)madt;
 434         madt_end = entry + madt->header.length;
 435
 436         /* Parse all entries looking for a match. */
 437
 438         entry += sizeof(struct acpi_table_madt);
 439         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 440                 struct acpi_subtable_header *header =
 441                         (struct acpi_subtable_header *)entry;
 442                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 443                         if (map_lapic_id(header, acpi_id, &apic_id))
 444                                 break;
 445                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 446                         if (map_lsapic_id(header, acpi_id, &apic_id))
 447                                 break;
 448                 }
 449                 entry += header->length;
 450         }
 451         return apic_id;
 452 }
 453
 454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 455 {
 456         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 457         union acpi_object *obj;
 458         struct acpi_subtable_header *header;
 459         int apic_id = -1;
 460
 461         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 462                 goto exit;
 463
 464         if (!buffer.length || !buffer.pointer)
 465                 goto exit;
 466
 467         obj = buffer.pointer;
 468         if (obj->type != ACPI_TYPE_BUFFER ||
 469             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 470                 goto exit;
 471         }
 472
 473         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 474         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 475                 map_lapic_id(header, acpi_id, &apic_id);
 476         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 477                 map_lsapic_id(header, acpi_id, &apic_id);
 478         }
 479
 480 exit:
 481         if (buffer.pointer)
 482                 kfree(buffer.pointer);
 483         return apic_id;
 484 }
 485
 486 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 487 {
 488         int i;
 489         int apic_id = -1;
 490
 491         apic_id = map_mat_entry(handle, acpi_id);
 492         if (apic_id == -1)
 493                 apic_id = map_madt_entry(acpi_id);
 494         if (apic_id == -1)
 495                 return apic_id;
 496
 497         for_each_possible_cpu(i) {
 498                 if (cpu_physical_id(i) == apic_id)
 499                         return i;
 500         }
 501         return -1;
 502 }
 503 #endif
 504
 505 /* --------------------------------------------------------------------------
 506                                  Driver Interface
 507    -------------------------------------------------------------------------- */
 508
 509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 510 {
 511         acpi_status status = 0;
 512         union acpi_object object = { 0 };
 513         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 514         int cpu_index;
 515         static int cpu0_initialized;
 516
 517
 518         if (!pr)
 519                 return -EINVAL;
 520
 521         if (num_online_cpus() > 1)
 522                 errata.smp = TRUE;
 523
 524         acpi_processor_errata(pr);
 525
 526         /*
 527          * Check to see if we have bus mastering arbitration control.  This
 528          * is required for proper C3 usage (to maintain cache coherency).
 529          */
 530         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 531                 pr->flags.bm_control = 1;
 532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 533                                   "Bus mastering arbitration control present\n"));
 534         } else
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "No bus mastering arbitration control\n"));
 537
 538         /* Check if it is a Device with HID and UID */
 539         if (has_uid) {
 540                 unsigned long value;
 541                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 542                                                 NULL, &value);
 543                 if (ACPI_FAILURE(status)) {
 544                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 545                         return -ENODEV;
 546                 }
 547                 pr->acpi_id = value;
 548         } else {
 549                 /*
 550                 * Evalute the processor object.  Note that it is common on SMP to
 551                 * have the first (boot) processor with a valid PBLK address while
 552                 * all others have a NULL address.
 553                 */
 554                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 555                 if (ACPI_FAILURE(status)) {
 556                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 557                         return -ENODEV;
 558                 }
 559
 560                 /*
 561                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 562                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 563                 */
 564                 pr->acpi_id = object.processor.proc_id;
 565         }
 566         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 567
 568         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 569         if (!cpu0_initialized && (cpu_index == -1) &&
 570             (num_online_cpus() == 1)) {
 571                 cpu_index = 0;
 572         }
 573
 574         cpu0_initialized = 1;
 575
 576         pr->id = cpu_index;
 577
 578         /*
 579          *  Extra Processor objects may be enumerated on MP systems with
 580          *  less than the max # of CPUs. They should be ignored _iff
 581          *  they are physically not present.
 582          */
 583         if (pr->id == -1) {
 584                 if (ACPI_FAILURE
 585                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 586                         return -ENODEV;
 587                 }
 588         }
 589
 590         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 591                           pr->acpi_id));
 592
 593         if (!object.processor.pblk_address)
 594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 595         else if (object.processor.pblk_length != 6)
 596                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 597                             object.processor.pblk_length);
 598         else {
 599                 pr->throttling.address = object.processor.pblk_address;
 600                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 601                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 602
 603                 pr->pblk = object.processor.pblk_address;
 604
 605                 /*
 606                  * We don't care about error returns - we just try to mark
 607                  * these reserved so that nobody else is confused into thinking
 608                  * that this region might be unused..
 609                  *
 610                  * (In particular, allocating the IO range for Cardbus)
 611                  */
 612                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 613         }
 614
 615         return 0;
 616 }
 617
 618 static void *processor_device_array[NR_CPUS];
 619
 620 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 621 {
 622         int result = 0;
 623         acpi_status status = AE_OK;
 624         struct acpi_processor *pr;
 625
 626
 627         pr = acpi_driver_data(device);
 628
 629         result = acpi_processor_get_info(pr, device->flags.unique_id);
 630         if (result) {
 631                 /* Processor is physically not present */
 632                 return 0;
 633         }
 634
 635         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 636
 637         /*
 638          * Buggy BIOS check
 639          * ACPI id of processors can be reported wrongly by the BIOS.
 640          * Don't trust it blindly
 641          */
 642         if (processor_device_array[pr->id] != NULL &&
 643             processor_device_array[pr->id] != device) {
 644                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 645                         "for the processor\n");
 646                 return -ENODEV;
 647         }
 648         processor_device_array[pr->id] = device;
 649
 650         processors[pr->id] = pr;
 651
 652         result = acpi_processor_add_fs(device);
 653         if (result)
 654                 goto end;
 655
 656         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 657                                              acpi_processor_notify, pr);
 658
 659         /* _PDC call should be done before doing anything else (if reqd.). */
 660         arch_acpi_processor_init_pdc(pr);
 661         acpi_processor_set_pdc(pr);
 662 #ifdef CONFIG_CPU_FREQ
 663         acpi_processor_ppc_has_changed(pr);
 664 #endif
 665         acpi_processor_get_throttling_info(pr);
 666         acpi_processor_get_limit_info(pr);
 667
 668
 669         acpi_processor_power_init(pr, device);
 670
 671         if (pr->flags.throttling) {
 672                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 673                        acpi_device_name(device), acpi_device_bid(device));
 674                 printk(" %d throttling states", pr->throttling.state_count);
 675                 printk(")\n");
 676         }
 677
 678       end:
 679
 680         return result;
 681 }
 682
 683 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 684 {
 685         struct acpi_processor *pr = data;
 686         struct acpi_device *device = NULL;
 687         int saved;
 688
 689         if (!pr)
 690                 return;
 691
 692         if (acpi_bus_get_device(pr->handle, &device))
 693                 return;
 694
 695         switch (event) {
 696         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 697                 saved = pr->performance_platform_limit;
 698                 acpi_processor_ppc_has_changed(pr);
 699                 if (saved == pr->performance_platform_limit)
 700                         break;
 701                 acpi_bus_generate_proc_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_proc_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_proc_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_cpu_soft_notify(struct notifier_block *nfb,
 728                 unsigned long action, void *hcpu)
 729 {
 730         unsigned int cpu = (unsigned long)hcpu;
 731         struct acpi_processor *pr = processors[cpu];
 732
 733         if (action == CPU_ONLINE && pr) {
 734                 acpi_processor_ppc_has_changed(pr);
 735                 acpi_processor_cst_has_changed(pr);
 736                 acpi_processor_tstate_has_changed(pr);
 737         }
 738         return NOTIFY_OK;
 739 }
 740
 741 static struct notifier_block acpi_cpu_notifier =
 742 {
 743             .notifier_call = acpi_cpu_soft_notify,
 744 };
 745
 746 static int acpi_processor_add(struct acpi_device *device)
 747 {
 748         struct acpi_processor *pr = NULL;
 749
 750
 751         if (!device)
 752                 return -EINVAL;
 753
 754         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 755         if (!pr)
 756                 return -ENOMEM;
 757
 758         pr->handle = device->handle;
 759         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 760         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 761         acpi_driver_data(device) = pr;
 762
 763         return 0;
 764 }
 765
 766 static int acpi_processor_remove(struct acpi_device *device, int type)
 767 {
 768         acpi_status status = AE_OK;
 769         struct acpi_processor *pr = NULL;
 770
 771
 772         if (!device || !acpi_driver_data(device))
 773                 return -EINVAL;
 774
 775         pr = acpi_driver_data(device);
 776
 777         if (pr->id >= nr_cpu_ids) {
 778                 kfree(pr);
 779                 return 0;
 780         }
 781
 782         if (type == ACPI_BUS_REMOVAL_EJECT) {
 783                 if (acpi_processor_handle_eject(pr))
 784                         return -EINVAL;
 785         }
 786
 787         acpi_processor_power_exit(pr, device);
 788
 789         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 790                                             acpi_processor_notify);
 791
 792         acpi_processor_remove_fs(device);
 793
 794         processors[pr->id] = NULL;
 795
 796         kfree(pr);
 797
 798         return 0;
 799 }
 800
 801 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 802 /****************************************************************************
 803  *      Acpi processor hotplug support                                      *
 804  ****************************************************************************/
 805
 806 static int is_processor_present(acpi_handle handle);
 807
 808 static int is_processor_present(acpi_handle handle)
 809 {
 810         acpi_status status;
 811         unsigned long sta = 0;
 812
 813
 814         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 815         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 816                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 817                 return 0;
 818         }
 819         return 1;
 820 }
 821
 822 static
 823 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 824 {
 825         acpi_handle phandle;
 826         struct acpi_device *pdev;
 827         struct acpi_processor *pr;
 828
 829
 830         if (acpi_get_parent(handle, &phandle)) {
 831                 return -ENODEV;
 832         }
 833
 834         if (acpi_bus_get_device(phandle, &pdev)) {
 835                 return -ENODEV;
 836         }
 837
 838         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 839                 return -ENODEV;
 840         }
 841
 842         acpi_bus_start(*device);
 843
 844         pr = acpi_driver_data(*device);
 845         if (!pr)
 846                 return -ENODEV;
 847
 848         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 849                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 850         }
 851         return 0;
 852 }
 853
 854 static void
 855 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 856 {
 857         struct acpi_processor *pr;
 858         struct acpi_device *device = NULL;
 859         int result;
 860
 861
 862         switch (event) {
 863         case ACPI_NOTIFY_BUS_CHECK:
 864         case ACPI_NOTIFY_DEVICE_CHECK:
 865                 printk("Processor driver received %s event\n",
 866                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 867                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 868
 869                 if (!is_processor_present(handle))
 870                         break;
 871
 872                 if (acpi_bus_get_device(handle, &device)) {
 873                         result = acpi_processor_device_add(handle, &device);
 874                         if (result)
 875                                 printk(KERN_ERR PREFIX
 876                                             "Unable to add the device\n");
 877                         break;
 878                 }
 879
 880                 pr = acpi_driver_data(device);
 881                 if (!pr) {
 882                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 883                         break;
 884                 }
 885
 886                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 887                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 888                         break;
 889                 }
 890
 891                 result = acpi_processor_start(device);
 892                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 893                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 894                 } else {
 895                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 896                                     acpi_device_bid(device));
 897                 }
 898                 break;
 899         case ACPI_NOTIFY_EJECT_REQUEST:
 900                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 901                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 902
 903                 if (acpi_bus_get_device(handle, &device)) {
 904                         printk(KERN_ERR PREFIX
 905                                     "Device don't exist, dropping EJECT\n");
 906                         break;
 907                 }
 908                 pr = acpi_driver_data(device);
 909                 if (!pr) {
 910                         printk(KERN_ERR PREFIX
 911                                     "Driver data is NULL, dropping EJECT\n");
 912                         return;
 913                 }
 914
 915                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
 916                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 917                 break;
 918         default:
 919                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 920                                   "Unsupported event [0x%x]\n", event));
 921                 break;
 922         }
 923
 924         return;
 925 }
 926
 927 static acpi_status
 928 processor_walk_namespace_cb(acpi_handle handle,
 929                             u32 lvl, void *context, void **rv)
 930 {
 931         acpi_status status;
 932         int *action = context;
 933         acpi_object_type type = 0;
 934
 935         status = acpi_get_type(handle, &type);
 936         if (ACPI_FAILURE(status))
 937                 return (AE_OK);
 938
 939         if (type != ACPI_TYPE_PROCESSOR)
 940                 return (AE_OK);
 941
 942         switch (*action) {
 943         case INSTALL_NOTIFY_HANDLER:
 944                 acpi_install_notify_handler(handle,
 945                                             ACPI_SYSTEM_NOTIFY,
 946                                             acpi_processor_hotplug_notify,
 947                                             NULL);
 948                 break;
 949         case UNINSTALL_NOTIFY_HANDLER:
 950                 acpi_remove_notify_handler(handle,
 951                                            ACPI_SYSTEM_NOTIFY,
 952                                            acpi_processor_hotplug_notify);
 953                 break;
 954         default:
 955                 break;
 956         }
 957
 958         return (AE_OK);
 959 }
 960
 961 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 962 {
 963
 964         if (!is_processor_present(handle)) {
 965                 return AE_ERROR;
 966         }
 967
 968         if (acpi_map_lsapic(handle, p_cpu))
 969                 return AE_ERROR;
 970
 971         if (arch_register_cpu(*p_cpu)) {
 972                 acpi_unmap_lsapic(*p_cpu);
 973                 return AE_ERROR;
 974         }
 975
 976         return AE_OK;
 977 }
 978
 979 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 980 {
 981         if (cpu_online(pr->id)) {
 982                 return (-EINVAL);
 983         }
 984         arch_unregister_cpu(pr->id);
 985         acpi_unmap_lsapic(pr->id);
 986         return (0);
 987 }
 988 #else
 989 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 990 {
 991         return AE_ERROR;
 992 }
 993 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 994 {
 995         return (-EINVAL);
 996 }
 997 #endif
 998
 999 static
1000 void acpi_processor_install_hotplug_notify(void)
1001 {
1002 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1003         int action = INSTALL_NOTIFY_HANDLER;
1004         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1005                             ACPI_ROOT_OBJECT,
1006                             ACPI_UINT32_MAX,
1007                             processor_walk_namespace_cb, &action, NULL);
1008 #endif
1009         register_hotcpu_notifier(&acpi_cpu_notifier);
1010 }
1011
1012 static
1013 void acpi_processor_uninstall_hotplug_notify(void)
1014 {
1015 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1016         int action = UNINSTALL_NOTIFY_HANDLER;
1017         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1018                             ACPI_ROOT_OBJECT,
1019                             ACPI_UINT32_MAX,
1020                             processor_walk_namespace_cb, &action, NULL);
1021 #endif
1022         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1023 }
1024
1025 /*
1026  * We keep the driver loaded even when ACPI is not running.
1027  * This is needed for the powernow-k8 driver, that works even without
1028  * ACPI, but needs symbols from this driver
1029  */
1030
1031 static int __init acpi_processor_init(void)
1032 {
1033         int result = 0;
1034
1035
1036         memset(&processors, 0, sizeof(processors));
1037         memset(&errata, 0, sizeof(errata));
1038
1039 #ifdef CONFIG_SMP
1040         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1041                                 (struct acpi_table_header **)&madt)))
1042                 madt = NULL;
1043 #endif
1044
1045         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1046         if (!acpi_processor_dir)
1047                 return -ENOMEM;
1048         acpi_processor_dir->owner = THIS_MODULE;
1049
1050         result = cpuidle_register_driver(&acpi_idle_driver);
1051         if (result < 0)
1052                 goto out_proc;
1053
1054         result = acpi_bus_register_driver(&acpi_processor_driver);
1055         if (result < 0)
1056                 goto out_cpuidle;
1057
1058         acpi_processor_install_hotplug_notify();
1059
1060         acpi_thermal_cpufreq_init();
1061
1062         acpi_processor_ppc_init();
1063
1064         return 0;
1065
1066 out_cpuidle:
1067         cpuidle_unregister_driver(&acpi_idle_driver);
1068
1069 out_proc:
1070         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1071
1072         return result;
1073 }
1074
1075 static void __exit acpi_processor_exit(void)
1076 {
1077         acpi_processor_ppc_exit();
1078
1079         acpi_thermal_cpufreq_exit();
1080
1081         acpi_processor_uninstall_hotplug_notify();
1082
1083         acpi_bus_unregister_driver(&acpi_processor_driver);
1084
1085         cpuidle_unregister_driver(&acpi_idle_driver);
1086
1087         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1088
1089         return;
1090 }
1091
1092 module_init(acpi_processor_init);
1093 module_exit(acpi_processor_exit);
1094
1095 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1096
1097 MODULE_ALIAS("processor");