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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 #ifdef CONFIG_IA64
 426 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 427 #else
 428 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 429 #endif
 430
 431 static int map_madt_entry(u32 acpi_id)
 432 {
 433         unsigned long madt_end, entry;
 434         int apic_id = -1;
 435
 436         if (!madt)
 437                 return apic_id;
 438
 439         entry = (unsigned long)madt;
 440         madt_end = entry + madt->header.length;
 441
 442         /* Parse all entries looking for a match. */
 443
 444         entry += sizeof(struct acpi_table_madt);
 445         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 446                 struct acpi_subtable_header *header =
 447                         (struct acpi_subtable_header *)entry;
 448                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 449                         if (map_lapic_id(header, acpi_id, &apic_id))
 450                                 break;
 451                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 452                         if (map_lsapic_id(header, acpi_id, &apic_id))
 453                                 break;
 454                 }
 455                 entry += header->length;
 456         }
 457         return apic_id;
 458 }
 459
 460 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 461 {
 462         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 463         union acpi_object *obj;
 464         struct acpi_subtable_header *header;
 465         int apic_id = -1;
 466
 467         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 468                 goto exit;
 469
 470         if (!buffer.length || !buffer.pointer)
 471                 goto exit;
 472
 473         obj = buffer.pointer;
 474         if (obj->type != ACPI_TYPE_BUFFER ||
 475             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 476                 goto exit;
 477         }
 478
 479         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 480         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 481                 map_lapic_id(header, acpi_id, &apic_id);
 482         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 483                 map_lsapic_id(header, acpi_id, &apic_id);
 484         }
 485
 486 exit:
 487         if (buffer.pointer)
 488                 kfree(buffer.pointer);
 489         return apic_id;
 490 }
 491
 492 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 493 {
 494         int i;
 495         int apic_id = -1;
 496
 497         apic_id = map_mat_entry(handle, acpi_id);
 498         if (apic_id == -1)
 499                 apic_id = map_madt_entry(acpi_id);
 500         if (apic_id == -1)
 501                 return apic_id;
 502
 503         for (i = 0; i < NR_CPUS; ++i) {
 504                 if (arch_cpu_to_apicid[i] == apic_id)
 505                         return i;
 506         }
 507         return -1;
 508 }
 509 #endif
 510
 511 /* --------------------------------------------------------------------------
 512                                  Driver Interface
 513    -------------------------------------------------------------------------- */
 514
 515 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 516 {
 517         acpi_status status = 0;
 518         union acpi_object object = { 0 };
 519         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 520         int cpu_index;
 521         static int cpu0_initialized;
 522
 523
 524         if (!pr)
 525                 return -EINVAL;
 526
 527         if (num_online_cpus() > 1)
 528                 errata.smp = TRUE;
 529
 530         acpi_processor_errata(pr);
 531
 532         /*
 533          * Check to see if we have bus mastering arbitration control.  This
 534          * is required for proper C3 usage (to maintain cache coherency).
 535          */
 536         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 537                 pr->flags.bm_control = 1;
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                                   "Bus mastering arbitration control present\n"));
 540         } else
 541                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 542                                   "No bus mastering arbitration control\n"));
 543
 544         /* Check if it is a Device with HID and UID */
 545         if (has_uid) {
 546                 unsigned long value;
 547                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 548                                                 NULL, &value);
 549                 if (ACPI_FAILURE(status)) {
 550                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 551                         return -ENODEV;
 552                 }
 553                 pr->acpi_id = value;
 554         } else {
 555                 /*
 556                 * Evalute the processor object.  Note that it is common on SMP to
 557                 * have the first (boot) processor with a valid PBLK address while
 558                 * all others have a NULL address.
 559                 */
 560                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 561                 if (ACPI_FAILURE(status)) {
 562                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 563                         return -ENODEV;
 564                 }
 565
 566                 /*
 567                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 568                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 569                 */
 570                 pr->acpi_id = object.processor.proc_id;
 571         }
 572         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 573
 574         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 575         if (!cpu0_initialized && (cpu_index == -1) &&
 576             (num_online_cpus() == 1)) {
 577                 cpu_index = 0;
 578         }
 579
 580         cpu0_initialized = 1;
 581
 582         pr->id = cpu_index;
 583
 584         /*
 585          *  Extra Processor objects may be enumerated on MP systems with
 586          *  less than the max # of CPUs. They should be ignored _iff
 587          *  they are physically not present.
 588          */
 589         if (pr->id == -1) {
 590                 if (ACPI_FAILURE
 591                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 592                         return -ENODEV;
 593                 }
 594         }
 595
 596         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 597                           pr->acpi_id));
 598
 599         if (!object.processor.pblk_address)
 600                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 601         else if (object.processor.pblk_length != 6)
 602                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 603                             object.processor.pblk_length);
 604         else {
 605                 pr->throttling.address = object.processor.pblk_address;
 606                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 607                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 608
 609                 pr->pblk = object.processor.pblk_address;
 610
 611                 /*
 612                  * We don't care about error returns - we just try to mark
 613                  * these reserved so that nobody else is confused into thinking
 614                  * that this region might be unused..
 615                  *
 616                  * (In particular, allocating the IO range for Cardbus)
 617                  */
 618                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 619         }
 620
 621 #ifdef CONFIG_CPU_FREQ
 622         acpi_processor_ppc_has_changed(pr);
 623 #endif
 624         acpi_processor_get_throttling_info(pr);
 625         acpi_processor_get_limit_info(pr);
 626
 627         return 0;
 628 }
 629
 630 static void *processor_device_array[NR_CPUS];
 631
 632 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 633 {
 634         int result = 0;
 635         acpi_status status = AE_OK;
 636         struct acpi_processor *pr;
 637
 638
 639         pr = acpi_driver_data(device);
 640
 641         result = acpi_processor_get_info(pr, device->flags.unique_id);
 642         if (result) {
 643                 /* Processor is physically not present */
 644                 return 0;
 645         }
 646
 647         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 648
 649         /*
 650          * Buggy BIOS check
 651          * ACPI id of processors can be reported wrongly by the BIOS.
 652          * Don't trust it blindly
 653          */
 654         if (processor_device_array[pr->id] != NULL &&
 655             processor_device_array[pr->id] != device) {
 656                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 657                         "for the processor\n");
 658                 return -ENODEV;
 659         }
 660         processor_device_array[pr->id] = device;
 661
 662         processors[pr->id] = pr;
 663
 664         result = acpi_processor_add_fs(device);
 665         if (result)
 666                 goto end;
 667
 668         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 669                                              acpi_processor_notify, pr);
 670
 671         /* _PDC call should be done before doing anything else (if reqd.). */
 672         arch_acpi_processor_init_pdc(pr);
 673         acpi_processor_set_pdc(pr);
 674
 675         acpi_processor_power_init(pr, device);
 676
 677         if (pr->flags.throttling) {
 678                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 679                        acpi_device_name(device), acpi_device_bid(device));
 680                 printk(" %d throttling states", pr->throttling.state_count);
 681                 printk(")\n");
 682         }
 683
 684       end:
 685
 686         return result;
 687 }
 688
 689 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 690 {
 691         struct acpi_processor *pr = data;
 692         struct acpi_device *device = NULL;
 693
 694
 695         if (!pr)
 696                 return;
 697
 698         if (acpi_bus_get_device(pr->handle, &device))
 699                 return;
 700
 701         switch (event) {
 702         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 703                 acpi_processor_ppc_has_changed(pr);
 704                 acpi_bus_generate_proc_event(device, event,
 705                                         pr->performance_platform_limit);
 706                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 707                                                   device->dev.bus_id, event,
 708                                                   pr->performance_platform_limit);
 709                 break;
 710         case ACPI_PROCESSOR_NOTIFY_POWER:
 711                 acpi_processor_cst_has_changed(pr);
 712                 acpi_bus_generate_proc_event(device, event, 0);
 713                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 714                                                   device->dev.bus_id, event, 0);
 715                 break;
 716         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 717                 acpi_processor_tstate_has_changed(pr);
 718                 acpi_bus_generate_proc_event(device, event, 0);
 719                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 720                                                   device->dev.bus_id, event, 0);
 721         default:
 722                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 723                                   "Unsupported event [0x%x]\n", event));
 724                 break;
 725         }
 726
 727         return;
 728 }
 729
 730 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 731                 unsigned long action, void *hcpu)
 732 {
 733         unsigned int cpu = (unsigned long)hcpu;
 734         struct acpi_processor *pr = processors[cpu];
 735
 736         if (action == CPU_ONLINE && pr) {
 737                 acpi_processor_ppc_has_changed(pr);
 738                 acpi_processor_cst_has_changed(pr);
 739                 acpi_processor_tstate_has_changed(pr);
 740         }
 741         return NOTIFY_OK;
 742 }
 743
 744 static struct notifier_block acpi_cpu_notifier =
 745 {
 746             .notifier_call = acpi_cpu_soft_notify,
 747 };
 748
 749 static int acpi_processor_add(struct acpi_device *device)
 750 {
 751         struct acpi_processor *pr = NULL;
 752
 753
 754         if (!device)
 755                 return -EINVAL;
 756
 757         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 758         if (!pr)
 759                 return -ENOMEM;
 760
 761         pr->handle = device->handle;
 762         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 763         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 764         acpi_driver_data(device) = pr;
 765
 766         return 0;
 767 }
 768
 769 static int acpi_processor_remove(struct acpi_device *device, int type)
 770 {
 771         acpi_status status = AE_OK;
 772         struct acpi_processor *pr = NULL;
 773
 774
 775         if (!device || !acpi_driver_data(device))
 776                 return -EINVAL;
 777
 778         pr = acpi_driver_data(device);
 779
 780         if (pr->id >= NR_CPUS) {
 781                 kfree(pr);
 782                 return 0;
 783         }
 784
 785         if (type == ACPI_BUS_REMOVAL_EJECT) {
 786                 if (acpi_processor_handle_eject(pr))
 787                         return -EINVAL;
 788         }
 789
 790         acpi_processor_power_exit(pr, device);
 791
 792         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 793                                             acpi_processor_notify);
 794
 795         acpi_processor_remove_fs(device);
 796
 797         processors[pr->id] = NULL;
 798
 799         kfree(pr);
 800
 801         return 0;
 802 }
 803
 804 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 805 /****************************************************************************
 806  *      Acpi processor hotplug support                                      *
 807  ****************************************************************************/
 808
 809 static int is_processor_present(acpi_handle handle);
 810
 811 static int is_processor_present(acpi_handle handle)
 812 {
 813         acpi_status status;
 814         unsigned long sta = 0;
 815
 816
 817         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 818         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 819                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 820                 return 0;
 821         }
 822         return 1;
 823 }
 824
 825 static
 826 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 827 {
 828         acpi_handle phandle;
 829         struct acpi_device *pdev;
 830         struct acpi_processor *pr;
 831
 832
 833         if (acpi_get_parent(handle, &phandle)) {
 834                 return -ENODEV;
 835         }
 836
 837         if (acpi_bus_get_device(phandle, &pdev)) {
 838                 return -ENODEV;
 839         }
 840
 841         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 842                 return -ENODEV;
 843         }
 844
 845         acpi_bus_start(*device);
 846
 847         pr = acpi_driver_data(*device);
 848         if (!pr)
 849                 return -ENODEV;
 850
 851         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 852                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 853         }
 854         return 0;
 855 }
 856
 857 static void
 858 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 859 {
 860         struct acpi_processor *pr;
 861         struct acpi_device *device = NULL;
 862         int result;
 863
 864
 865         switch (event) {
 866         case ACPI_NOTIFY_BUS_CHECK:
 867         case ACPI_NOTIFY_DEVICE_CHECK:
 868                 printk("Processor driver received %s event\n",
 869                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 870                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 871
 872                 if (!is_processor_present(handle))
 873                         break;
 874
 875                 if (acpi_bus_get_device(handle, &device)) {
 876                         result = acpi_processor_device_add(handle, &device);
 877                         if (result)
 878                                 printk(KERN_ERR PREFIX
 879                                             "Unable to add the device\n");
 880                         break;
 881                 }
 882
 883                 pr = acpi_driver_data(device);
 884                 if (!pr) {
 885                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 886                         break;
 887                 }
 888
 889                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 890                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 891                         break;
 892                 }
 893
 894                 result = acpi_processor_start(device);
 895                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 896                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 897                 } else {
 898                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 899                                     acpi_device_bid(device));
 900                 }
 901                 break;
 902         case ACPI_NOTIFY_EJECT_REQUEST:
 903                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 904                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 905
 906                 if (acpi_bus_get_device(handle, &device)) {
 907                         printk(KERN_ERR PREFIX
 908                                     "Device don't exist, dropping EJECT\n");
 909                         break;
 910                 }
 911                 pr = acpi_driver_data(device);
 912                 if (!pr) {
 913                         printk(KERN_ERR PREFIX
 914                                     "Driver data is NULL, dropping EJECT\n");
 915                         return;
 916                 }
 917
 918                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 919                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 920                 break;
 921         default:
 922                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 923                                   "Unsupported event [0x%x]\n", event));
 924                 break;
 925         }
 926
 927         return;
 928 }
 929
 930 static acpi_status
 931 processor_walk_namespace_cb(acpi_handle handle,
 932                             u32 lvl, void *context, void **rv)
 933 {
 934         acpi_status status;
 935         int *action = context;
 936         acpi_object_type type = 0;
 937
 938         status = acpi_get_type(handle, &type);
 939         if (ACPI_FAILURE(status))
 940                 return (AE_OK);
 941
 942         if (type != ACPI_TYPE_PROCESSOR)
 943                 return (AE_OK);
 944
 945         switch (*action) {
 946         case INSTALL_NOTIFY_HANDLER:
 947                 acpi_install_notify_handler(handle,
 948                                             ACPI_SYSTEM_NOTIFY,
 949                                             acpi_processor_hotplug_notify,
 950                                             NULL);
 951                 break;
 952         case UNINSTALL_NOTIFY_HANDLER:
 953                 acpi_remove_notify_handler(handle,
 954                                            ACPI_SYSTEM_NOTIFY,
 955                                            acpi_processor_hotplug_notify);
 956                 break;
 957         default:
 958                 break;
 959         }
 960
 961         return (AE_OK);
 962 }
 963
 964 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 965 {
 966
 967         if (!is_processor_present(handle)) {
 968                 return AE_ERROR;
 969         }
 970
 971         if (acpi_map_lsapic(handle, p_cpu))
 972                 return AE_ERROR;
 973
 974         if (arch_register_cpu(*p_cpu)) {
 975                 acpi_unmap_lsapic(*p_cpu);
 976                 return AE_ERROR;
 977         }
 978
 979         return AE_OK;
 980 }
 981
 982 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 983 {
 984         if (cpu_online(pr->id)) {
 985                 return (-EINVAL);
 986         }
 987         arch_unregister_cpu(pr->id);
 988         acpi_unmap_lsapic(pr->id);
 989         return (0);
 990 }
 991 #else
 992 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 993 {
 994         return AE_ERROR;
 995 }
 996 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 997 {
 998         return (-EINVAL);
 999 }
1000 #endif
1001
1002 static
1003 void acpi_processor_install_hotplug_notify(void)
1004 {
1005 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1006         int action = INSTALL_NOTIFY_HANDLER;
1007         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1008                             ACPI_ROOT_OBJECT,
1009                             ACPI_UINT32_MAX,
1010                             processor_walk_namespace_cb, &action, NULL);
1011 #endif
1012         register_hotcpu_notifier(&acpi_cpu_notifier);
1013 }
1014
1015 static
1016 void acpi_processor_uninstall_hotplug_notify(void)
1017 {
1018 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1019         int action = UNINSTALL_NOTIFY_HANDLER;
1020         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1021                             ACPI_ROOT_OBJECT,
1022                             ACPI_UINT32_MAX,
1023                             processor_walk_namespace_cb, &action, NULL);
1024 #endif
1025         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1026 }
1027
1028 /*
1029  * We keep the driver loaded even when ACPI is not running.
1030  * This is needed for the powernow-k8 driver, that works even without
1031  * ACPI, but needs symbols from this driver
1032  */
1033
1034 static int __init acpi_processor_init(void)
1035 {
1036         int result = 0;
1037
1038
1039         memset(&processors, 0, sizeof(processors));
1040         memset(&errata, 0, sizeof(errata));
1041
1042 #ifdef CONFIG_SMP
1043         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1044                                 (struct acpi_table_header **)&madt)))
1045                 madt = NULL;
1046 #endif
1047
1048         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1049         if (!acpi_processor_dir)
1050                 return -ENOMEM;
1051         acpi_processor_dir->owner = THIS_MODULE;
1052
1053         result = cpuidle_register_driver(&acpi_idle_driver);
1054         if (result < 0)
1055                 goto out_proc;
1056
1057         result = acpi_bus_register_driver(&acpi_processor_driver);
1058         if (result < 0)
1059                 goto out_cpuidle;
1060
1061         acpi_processor_install_hotplug_notify();
1062
1063         acpi_thermal_cpufreq_init();
1064
1065         acpi_processor_ppc_init();
1066
1067         return 0;
1068
1069 out_cpuidle:
1070         cpuidle_unregister_driver(&acpi_idle_driver);
1071
1072 out_proc:
1073         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1074
1075         return result;
1076 }
1077
1078 static void __exit acpi_processor_exit(void)
1079 {
1080         acpi_processor_ppc_exit();
1081
1082         acpi_thermal_cpufreq_exit();
1083
1084         acpi_processor_uninstall_hotplug_notify();
1085
1086         acpi_bus_unregister_driver(&acpi_processor_driver);
1087
1088         cpuidle_unregister_driver(&acpi_idle_driver);
1089
1090         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1091
1092         return;
1093 }
1094
1095 module_init(acpi_processor_init);
1096 module_exit(acpi_processor_exit);
1097
1098 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1099
1100 MODULE_ALIAS("processor");