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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
  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                 .suspend = acpi_processor_suspend,
 106                 .resume = acpi_processor_resume,
 107                 },
 108 };
 109
 110 #define INSTALL_NOTIFY_HANDLER          1
 111 #define UNINSTALL_NOTIFY_HANDLER        2
 112
 113 static const struct file_operations acpi_processor_info_fops = {
 114         .open = acpi_processor_info_open_fs,
 115         .read = seq_read,
 116         .llseek = seq_lseek,
 117         .release = single_release,
 118 };
 119
 120 struct acpi_processor *processors[NR_CPUS];
 121 struct acpi_processor_errata errata __read_mostly;
 122
 123 /* --------------------------------------------------------------------------
 124                                 Errata Handling
 125    -------------------------------------------------------------------------- */
 126
 127 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 128 {
 129         u8 value1 = 0;
 130         u8 value2 = 0;
 131
 132
 133         if (!dev)
 134                 return -EINVAL;
 135
 136         /*
 137          * Note that 'dev' references the PIIX4 ACPI Controller.
 138          */
 139
 140         switch (dev->revision) {
 141         case 0:
 142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 143                 break;
 144         case 1:
 145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 146                 break;
 147         case 2:
 148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 149                 break;
 150         case 3:
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 152                 break;
 153         default:
 154                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 155                 break;
 156         }
 157
 158         switch (dev->revision) {
 159
 160         case 0:         /* PIIX4 A-step */
 161         case 1:         /* PIIX4 B-step */
 162                 /*
 163                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 164                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 165                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 166                  * 2002 PIIX4 specification update.  Applies to only older
 167                  * PIIX4 models.
 168                  */
 169                 errata.piix4.throttle = 1;
 170
 171         case 2:         /* PIIX4E */
 172         case 3:         /* PIIX4M */
 173                 /*
 174                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 175                  * Livelock") from the January 2002 PIIX4 specification update.
 176                  * Applies to all PIIX4 models.
 177                  */
 178
 179                 /*
 180                  * BM-IDE
 181                  * ------
 182                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 183                  * Status register address.  We'll use this later to read
 184                  * each IDE controller's DMA status to make sure we catch all
 185                  * DMA activity.
 186                  */
 187                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 188                                      PCI_DEVICE_ID_INTEL_82371AB,
 189                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 190                 if (dev) {
 191                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 192                         pci_dev_put(dev);
 193                 }
 194
 195                 /*
 196                  * Type-F DMA
 197                  * ----------
 198                  * Find the PIIX4 ISA Controller and read the Motherboard
 199                  * DMA controller's status to see if Type-F (Fast) DMA mode
 200                  * is enabled (bit 7) on either channel.  Note that we'll
 201                  * disable C3 support if this is enabled, as some legacy
 202                  * devices won't operate well if fast DMA is disabled.
 203                  */
 204                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 205                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 206                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 207                 if (dev) {
 208                         pci_read_config_byte(dev, 0x76, &value1);
 209                         pci_read_config_byte(dev, 0x77, &value2);
 210                         if ((value1 & 0x80) || (value2 & 0x80))
 211                                 errata.piix4.fdma = 1;
 212                         pci_dev_put(dev);
 213                 }
 214
 215                 break;
 216         }
 217
 218         if (errata.piix4.bmisx)
 219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 220                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 221         if (errata.piix4.fdma)
 222                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 223                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 224
 225         return 0;
 226 }
 227
 228 static int acpi_processor_errata(struct acpi_processor *pr)
 229 {
 230         int result = 0;
 231         struct pci_dev *dev = NULL;
 232
 233
 234         if (!pr)
 235                 return -EINVAL;
 236
 237         /*
 238          * PIIX4
 239          */
 240         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 241                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 242                              PCI_ANY_ID, NULL);
 243         if (dev) {
 244                 result = acpi_processor_errata_piix4(dev);
 245                 pci_dev_put(dev);
 246         }
 247
 248         return result;
 249 }
 250
 251 /* --------------------------------------------------------------------------
 252                               Common ACPI processor functions
 253    -------------------------------------------------------------------------- */
 254
 255 /*
 256  * _PDC is required for a BIOS-OS handshake for most of the newer
 257  * ACPI processor features.
 258  */
 259 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 260 {
 261         struct acpi_object_list *pdc_in = pr->pdc;
 262         acpi_status status = AE_OK;
 263
 264
 265         if (!pdc_in)
 266                 return status;
 267
 268         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 269
 270         if (ACPI_FAILURE(status))
 271                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 272                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 273
 274         return status;
 275 }
 276
 277 /* --------------------------------------------------------------------------
 278                               FS Interface (/proc)
 279    -------------------------------------------------------------------------- */
 280
 281 static struct proc_dir_entry *acpi_processor_dir = NULL;
 282
 283 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 284 {
 285         struct acpi_processor *pr = seq->private;
 286
 287
 288         if (!pr)
 289                 goto end;
 290
 291         seq_printf(seq, "processor id:            %d\n"
 292                    "acpi id:                 %d\n"
 293                    "bus mastering control:   %s\n"
 294                    "power management:        %s\n"
 295                    "throttling control:      %s\n"
 296                    "limit interface:         %s\n",
 297                    pr->id,
 298                    pr->acpi_id,
 299                    pr->flags.bm_control ? "yes" : "no",
 300                    pr->flags.power ? "yes" : "no",
 301                    pr->flags.throttling ? "yes" : "no",
 302                    pr->flags.limit ? "yes" : "no");
 303
 304       end:
 305         return 0;
 306 }
 307
 308 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 309 {
 310         return single_open(file, acpi_processor_info_seq_show,
 311                            PDE(inode)->data);
 312 }
 313
 314 static int acpi_processor_add_fs(struct acpi_device *device)
 315 {
 316         struct proc_dir_entry *entry = NULL;
 317
 318
 319         if (!acpi_device_dir(device)) {
 320                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 321                                                      acpi_processor_dir);
 322                 if (!acpi_device_dir(device))
 323                         return -ENODEV;
 324         }
 325         acpi_device_dir(device)->owner = THIS_MODULE;
 326
 327         /* 'info' [R] */
 328         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 329                                   S_IRUGO, acpi_device_dir(device));
 330         if (!entry)
 331                 return -EIO;
 332         else {
 333                 entry->proc_fops = &acpi_processor_info_fops;
 334                 entry->data = acpi_driver_data(device);
 335                 entry->owner = THIS_MODULE;
 336         }
 337
 338         /* 'throttling' [R/W] */
 339         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 340                                   S_IFREG | S_IRUGO | S_IWUSR,
 341                                   acpi_device_dir(device));
 342         if (!entry)
 343                 return -EIO;
 344         else {
 345                 entry->proc_fops = &acpi_processor_throttling_fops;
 346                 entry->data = acpi_driver_data(device);
 347                 entry->owner = THIS_MODULE;
 348         }
 349
 350         /* 'limit' [R/W] */
 351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 352                                   S_IFREG | S_IRUGO | S_IWUSR,
 353                                   acpi_device_dir(device));
 354         if (!entry)
 355                 return -EIO;
 356         else {
 357                 entry->proc_fops = &acpi_processor_limit_fops;
 358                 entry->data = acpi_driver_data(device);
 359                 entry->owner = THIS_MODULE;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int acpi_processor_remove_fs(struct acpi_device *device)
 366 {
 367
 368         if (acpi_device_dir(device)) {
 369                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 370                                   acpi_device_dir(device));
 371                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 372                                   acpi_device_dir(device));
 373                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 374                                   acpi_device_dir(device));
 375                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 376                 acpi_device_dir(device) = NULL;
 377         }
 378
 379         return 0;
 380 }
 381
 382 /* Use the acpiid in MADT to map cpus in case of SMP */
 383
 384 #ifndef CONFIG_SMP
 385 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 386 #else
 387
 388 static struct acpi_table_madt *madt;
 389
 390 static int map_lapic_id(struct acpi_subtable_header *entry,
 391                  u32 acpi_id, int *apic_id)
 392 {
 393         struct acpi_madt_local_apic *lapic =
 394                 (struct acpi_madt_local_apic *)entry;
 395         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 396             lapic->processor_id == acpi_id) {
 397                 *apic_id = lapic->id;
 398                 return 1;
 399         }
 400         return 0;
 401 }
 402
 403 static int map_lsapic_id(struct acpi_subtable_header *entry,
 404                   u32 acpi_id, int *apic_id)
 405 {
 406         struct acpi_madt_local_sapic *lsapic =
 407                 (struct acpi_madt_local_sapic *)entry;
 408         /* Only check enabled APICs*/
 409         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 410                 /* First check against id */
 411                 if (lsapic->processor_id == acpi_id) {
 412                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 413                         return 1;
 414                 /* Check against optional uid */
 415                 } else if (entry->length >= 16 &&
 416                         lsapic->uid == acpi_id) {
 417                         *apic_id = lsapic->uid;
 418                         return 1;
 419                 }
 420         }
 421         return 0;
 422 }
 423
 424 #ifdef CONFIG_IA64
 425 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 426 #else
 427 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 428 #endif
 429
 430 static int map_madt_entry(u32 acpi_id)
 431 {
 432         unsigned long madt_end, entry;
 433         int apic_id = -1;
 434
 435         if (!madt)
 436                 return apic_id;
 437
 438         entry = (unsigned long)madt;
 439         madt_end = entry + madt->header.length;
 440
 441         /* Parse all entries looking for a match. */
 442
 443         entry += sizeof(struct acpi_table_madt);
 444         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 445                 struct acpi_subtable_header *header =
 446                         (struct acpi_subtable_header *)entry;
 447                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 448                         if (map_lapic_id(header, acpi_id, &apic_id))
 449                                 break;
 450                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 451                         if (map_lsapic_id(header, acpi_id, &apic_id))
 452                                 break;
 453                 }
 454                 entry += header->length;
 455         }
 456         return apic_id;
 457 }
 458
 459 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 460 {
 461         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 462         union acpi_object *obj;
 463         struct acpi_subtable_header *header;
 464         int apic_id = -1;
 465
 466         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 467                 goto exit;
 468
 469         if (!buffer.length || !buffer.pointer)
 470                 goto exit;
 471
 472         obj = buffer.pointer;
 473         if (obj->type != ACPI_TYPE_BUFFER ||
 474             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 475                 goto exit;
 476         }
 477
 478         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 479         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 480                 map_lapic_id(header, acpi_id, &apic_id);
 481         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 482                 map_lsapic_id(header, acpi_id, &apic_id);
 483         }
 484
 485 exit:
 486         if (buffer.pointer)
 487                 kfree(buffer.pointer);
 488         return apic_id;
 489 }
 490
 491 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 492 {
 493         int i;
 494         int apic_id = -1;
 495
 496         apic_id = map_mat_entry(handle, acpi_id);
 497         if (apic_id == -1)
 498                 apic_id = map_madt_entry(acpi_id);
 499         if (apic_id == -1)
 500                 return apic_id;
 501
 502         for (i = 0; i < NR_CPUS; ++i) {
 503                 if (arch_cpu_to_apicid[i] == apic_id)
 504                         return i;
 505         }
 506         return -1;
 507 }
 508 #endif
 509
 510 /* --------------------------------------------------------------------------
 511                                  Driver Interface
 512    -------------------------------------------------------------------------- */
 513
 514 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 515 {
 516         acpi_status status = 0;
 517         union acpi_object object = { 0 };
 518         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 519         int cpu_index;
 520         static int cpu0_initialized;
 521
 522
 523         if (!pr)
 524                 return -EINVAL;
 525
 526         if (num_online_cpus() > 1)
 527                 errata.smp = TRUE;
 528
 529         acpi_processor_errata(pr);
 530
 531         /*
 532          * Check to see if we have bus mastering arbitration control.  This
 533          * is required for proper C3 usage (to maintain cache coherency).
 534          */
 535         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 536                 pr->flags.bm_control = 1;
 537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 538                                   "Bus mastering arbitration control present\n"));
 539         } else
 540                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 541                                   "No bus mastering arbitration control\n"));
 542
 543         /* Check if it is a Device with HID and UID */
 544         if (has_uid) {
 545                 unsigned long value;
 546                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 547                                                 NULL, &value);
 548                 if (ACPI_FAILURE(status)) {
 549                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 550                         return -ENODEV;
 551                 }
 552                 pr->acpi_id = value;
 553         } else {
 554                 /*
 555                 * Evalute the processor object.  Note that it is common on SMP to
 556                 * have the first (boot) processor with a valid PBLK address while
 557                 * all others have a NULL address.
 558                 */
 559                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 560                 if (ACPI_FAILURE(status)) {
 561                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 562                         return -ENODEV;
 563                 }
 564
 565                 /*
 566                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 567                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 568                 */
 569                 pr->acpi_id = object.processor.proc_id;
 570         }
 571         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 572
 573         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 574         if (!cpu0_initialized && (cpu_index == -1) &&
 575             (num_online_cpus() == 1)) {
 576                 cpu_index = 0;
 577         }
 578
 579         cpu0_initialized = 1;
 580
 581         pr->id = cpu_index;
 582
 583         /*
 584          *  Extra Processor objects may be enumerated on MP systems with
 585          *  less than the max # of CPUs. They should be ignored _iff
 586          *  they are physically not present.
 587          */
 588         if (pr->id == -1) {
 589                 if (ACPI_FAILURE
 590                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 591                         return -ENODEV;
 592                 }
 593         }
 594
 595         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 596                           pr->acpi_id));
 597
 598         if (!object.processor.pblk_address)
 599                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 600         else if (object.processor.pblk_length != 6)
 601                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 602                             object.processor.pblk_length);
 603         else {
 604                 pr->throttling.address = object.processor.pblk_address;
 605                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 606                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 607
 608                 pr->pblk = object.processor.pblk_address;
 609
 610                 /*
 611                  * We don't care about error returns - we just try to mark
 612                  * these reserved so that nobody else is confused into thinking
 613                  * that this region might be unused..
 614                  *
 615                  * (In particular, allocating the IO range for Cardbus)
 616                  */
 617                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 618         }
 619
 620 #ifdef CONFIG_CPU_FREQ
 621         acpi_processor_ppc_has_changed(pr);
 622 #endif
 623         acpi_processor_get_throttling_info(pr);
 624         acpi_processor_get_limit_info(pr);
 625
 626         return 0;
 627 }
 628
 629 static void *processor_device_array[NR_CPUS];
 630
 631 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 632 {
 633         int result = 0;
 634         acpi_status status = AE_OK;
 635         struct acpi_processor *pr;
 636
 637
 638         pr = acpi_driver_data(device);
 639
 640         result = acpi_processor_get_info(pr, device->flags.unique_id);
 641         if (result) {
 642                 /* Processor is physically not present */
 643                 return 0;
 644         }
 645
 646         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 647
 648         /*
 649          * Buggy BIOS check
 650          * ACPI id of processors can be reported wrongly by the BIOS.
 651          * Don't trust it blindly
 652          */
 653         if (processor_device_array[pr->id] != NULL &&
 654             processor_device_array[pr->id] != device) {
 655                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 656                         "for the processor\n");
 657                 return -ENODEV;
 658         }
 659         processor_device_array[pr->id] = device;
 660
 661         processors[pr->id] = pr;
 662
 663         result = acpi_processor_add_fs(device);
 664         if (result)
 665                 goto end;
 666
 667         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 668                                              acpi_processor_notify, pr);
 669
 670         /* _PDC call should be done before doing anything else (if reqd.). */
 671         arch_acpi_processor_init_pdc(pr);
 672         acpi_processor_set_pdc(pr);
 673
 674         acpi_processor_power_init(pr, device);
 675
 676         if (pr->flags.throttling) {
 677                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 678                        acpi_device_name(device), acpi_device_bid(device));
 679                 printk(" %d throttling states", pr->throttling.state_count);
 680                 printk(")\n");
 681         }
 682
 683       end:
 684
 685         return result;
 686 }
 687
 688 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 689 {
 690         struct acpi_processor *pr = data;
 691         struct acpi_device *device = NULL;
 692
 693
 694         if (!pr)
 695                 return;
 696
 697         if (acpi_bus_get_device(pr->handle, &device))
 698                 return;
 699
 700         switch (event) {
 701         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 702                 acpi_processor_ppc_has_changed(pr);
 703                 acpi_bus_generate_proc_event(device, event,
 704                                         pr->performance_platform_limit);
 705                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 706                                                   device->dev.bus_id, event,
 707                                                   pr->performance_platform_limit);
 708                 break;
 709         case ACPI_PROCESSOR_NOTIFY_POWER:
 710                 acpi_processor_cst_has_changed(pr);
 711                 acpi_bus_generate_proc_event(device, event, 0);
 712                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 713                                                   device->dev.bus_id, event, 0);
 714                 break;
 715         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 716                 acpi_processor_tstate_has_changed(pr);
 717                 acpi_bus_generate_proc_event(device, event, 0);
 718                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 719                                                   device->dev.bus_id, event, 0);
 720         default:
 721                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 722                                   "Unsupported event [0x%x]\n", event));
 723                 break;
 724         }
 725
 726         return;
 727 }
 728
 729 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 730                 unsigned long action, void *hcpu)
 731 {
 732         unsigned int cpu = (unsigned long)hcpu;
 733         struct acpi_processor *pr = processors[cpu];
 734
 735         if (action == CPU_ONLINE && pr) {
 736                 acpi_processor_ppc_has_changed(pr);
 737                 acpi_processor_cst_has_changed(pr);
 738                 acpi_processor_tstate_has_changed(pr);
 739         }
 740         return NOTIFY_OK;
 741 }
 742
 743 static struct notifier_block acpi_cpu_notifier =
 744 {
 745             .notifier_call = acpi_cpu_soft_notify,
 746 };
 747
 748 static int acpi_processor_add(struct acpi_device *device)
 749 {
 750         struct acpi_processor *pr = NULL;
 751
 752
 753         if (!device)
 754                 return -EINVAL;
 755
 756         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 757         if (!pr)
 758                 return -ENOMEM;
 759
 760         pr->handle = device->handle;
 761         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 762         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 763         acpi_driver_data(device) = pr;
 764
 765         return 0;
 766 }
 767
 768 static int acpi_processor_remove(struct acpi_device *device, int type)
 769 {
 770         acpi_status status = AE_OK;
 771         struct acpi_processor *pr = NULL;
 772
 773
 774         if (!device || !acpi_driver_data(device))
 775                 return -EINVAL;
 776
 777         pr = acpi_driver_data(device);
 778
 779         if (pr->id >= NR_CPUS) {
 780                 kfree(pr);
 781                 return 0;
 782         }
 783
 784         if (type == ACPI_BUS_REMOVAL_EJECT) {
 785                 if (acpi_processor_handle_eject(pr))
 786                         return -EINVAL;
 787         }
 788
 789         acpi_processor_power_exit(pr, device);
 790
 791         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 792                                             acpi_processor_notify);
 793
 794         acpi_processor_remove_fs(device);
 795
 796         processors[pr->id] = NULL;
 797
 798         kfree(pr);
 799
 800         return 0;
 801 }
 802
 803 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 804 /****************************************************************************
 805  *      Acpi processor hotplug support                                      *
 806  ****************************************************************************/
 807
 808 static int is_processor_present(acpi_handle handle);
 809
 810 static int is_processor_present(acpi_handle handle)
 811 {
 812         acpi_status status;
 813         unsigned long sta = 0;
 814
 815
 816         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 817         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 818                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 819                 return 0;
 820         }
 821         return 1;
 822 }
 823
 824 static
 825 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 826 {
 827         acpi_handle phandle;
 828         struct acpi_device *pdev;
 829         struct acpi_processor *pr;
 830
 831
 832         if (acpi_get_parent(handle, &phandle)) {
 833                 return -ENODEV;
 834         }
 835
 836         if (acpi_bus_get_device(phandle, &pdev)) {
 837                 return -ENODEV;
 838         }
 839
 840         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 841                 return -ENODEV;
 842         }
 843
 844         acpi_bus_start(*device);
 845
 846         pr = acpi_driver_data(*device);
 847         if (!pr)
 848                 return -ENODEV;
 849
 850         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 851                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 852         }
 853         return 0;
 854 }
 855
 856 static void
 857 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 858 {
 859         struct acpi_processor *pr;
 860         struct acpi_device *device = NULL;
 861         int result;
 862
 863
 864         switch (event) {
 865         case ACPI_NOTIFY_BUS_CHECK:
 866         case ACPI_NOTIFY_DEVICE_CHECK:
 867                 printk("Processor driver received %s event\n",
 868                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 869                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 870
 871                 if (!is_processor_present(handle))
 872                         break;
 873
 874                 if (acpi_bus_get_device(handle, &device)) {
 875                         result = acpi_processor_device_add(handle, &device);
 876                         if (result)
 877                                 printk(KERN_ERR PREFIX
 878                                             "Unable to add the device\n");
 879                         break;
 880                 }
 881
 882                 pr = acpi_driver_data(device);
 883                 if (!pr) {
 884                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 885                         break;
 886                 }
 887
 888                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 889                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 890                         break;
 891                 }
 892
 893                 result = acpi_processor_start(device);
 894                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 895                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 896                 } else {
 897                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 898                                     acpi_device_bid(device));
 899                 }
 900                 break;
 901         case ACPI_NOTIFY_EJECT_REQUEST:
 902                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 903                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 904
 905                 if (acpi_bus_get_device(handle, &device)) {
 906                         printk(KERN_ERR PREFIX
 907                                     "Device don't exist, dropping EJECT\n");
 908                         break;
 909                 }
 910                 pr = acpi_driver_data(device);
 911                 if (!pr) {
 912                         printk(KERN_ERR PREFIX
 913                                     "Driver data is NULL, dropping EJECT\n");
 914                         return;
 915                 }
 916
 917                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 918                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 919                 break;
 920         default:
 921                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 922                                   "Unsupported event [0x%x]\n", event));
 923                 break;
 924         }
 925
 926         return;
 927 }
 928
 929 static acpi_status
 930 processor_walk_namespace_cb(acpi_handle handle,
 931                             u32 lvl, void *context, void **rv)
 932 {
 933         acpi_status status;
 934         int *action = context;
 935         acpi_object_type type = 0;
 936
 937         status = acpi_get_type(handle, &type);
 938         if (ACPI_FAILURE(status))
 939                 return (AE_OK);
 940
 941         if (type != ACPI_TYPE_PROCESSOR)
 942                 return (AE_OK);
 943
 944         switch (*action) {
 945         case INSTALL_NOTIFY_HANDLER:
 946                 acpi_install_notify_handler(handle,
 947                                             ACPI_SYSTEM_NOTIFY,
 948                                             acpi_processor_hotplug_notify,
 949                                             NULL);
 950                 break;
 951         case UNINSTALL_NOTIFY_HANDLER:
 952                 acpi_remove_notify_handler(handle,
 953                                            ACPI_SYSTEM_NOTIFY,
 954                                            acpi_processor_hotplug_notify);
 955                 break;
 956         default:
 957                 break;
 958         }
 959
 960         return (AE_OK);
 961 }
 962
 963 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 964 {
 965
 966         if (!is_processor_present(handle)) {
 967                 return AE_ERROR;
 968         }
 969
 970         if (acpi_map_lsapic(handle, p_cpu))
 971                 return AE_ERROR;
 972
 973         if (arch_register_cpu(*p_cpu)) {
 974                 acpi_unmap_lsapic(*p_cpu);
 975                 return AE_ERROR;
 976         }
 977
 978         return AE_OK;
 979 }
 980
 981 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 982 {
 983         if (cpu_online(pr->id)) {
 984                 return (-EINVAL);
 985         }
 986         arch_unregister_cpu(pr->id);
 987         acpi_unmap_lsapic(pr->id);
 988         return (0);
 989 }
 990 #else
 991 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 992 {
 993         return AE_ERROR;
 994 }
 995 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 996 {
 997         return (-EINVAL);
 998 }
 999 #endif
1000
1001 static
1002 void acpi_processor_install_hotplug_notify(void)
1003 {
1004 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1005         int action = INSTALL_NOTIFY_HANDLER;
1006         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1007                             ACPI_ROOT_OBJECT,
1008                             ACPI_UINT32_MAX,
1009                             processor_walk_namespace_cb, &action, NULL);
1010 #endif
1011         register_hotcpu_notifier(&acpi_cpu_notifier);
1012 }
1013
1014 static
1015 void acpi_processor_uninstall_hotplug_notify(void)
1016 {
1017 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1018         int action = UNINSTALL_NOTIFY_HANDLER;
1019         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1020                             ACPI_ROOT_OBJECT,
1021                             ACPI_UINT32_MAX,
1022                             processor_walk_namespace_cb, &action, NULL);
1023 #endif
1024         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1025 }
1026
1027 /*
1028  * We keep the driver loaded even when ACPI is not running.
1029  * This is needed for the powernow-k8 driver, that works even without
1030  * ACPI, but needs symbols from this driver
1031  */
1032
1033 static int __init acpi_processor_init(void)
1034 {
1035         int result = 0;
1036
1037
1038         memset(&processors, 0, sizeof(processors));
1039         memset(&errata, 0, sizeof(errata));
1040
1041 #ifdef CONFIG_SMP
1042         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1043                                 (struct acpi_table_header **)&madt)))
1044                 madt = NULL;
1045 #endif
1046
1047         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1048         if (!acpi_processor_dir)
1049                 return -ENOMEM;
1050         acpi_processor_dir->owner = THIS_MODULE;
1051
1052         result = acpi_bus_register_driver(&acpi_processor_driver);
1053         if (result < 0) {
1054                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1055                 return result;
1056         }
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
1067 static void __exit acpi_processor_exit(void)
1068 {
1069
1070         acpi_processor_ppc_exit();
1071
1072         acpi_thermal_cpufreq_exit();
1073
1074         acpi_processor_uninstall_hotplug_notify();
1075
1076         acpi_bus_unregister_driver(&acpi_processor_driver);
1077
1078         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1079
1080         return;
1081 }
1082
1083 module_init(acpi_processor_init);
1084 module_exit(acpi_processor_exit);
1085
1086 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1087
1088 MODULE_ALIAS("processor");