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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_DRIVER_NAME      "ACPI Processor Driver"
  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
  71 #define ACPI_PROCESSOR_LIMIT_USER       0
  72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  73
  74 #define ACPI_STA_PRESENT 0x00000001
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("acpi_processor")
  78
  79     MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_start(struct acpi_device *device);
  85 static int acpi_processor_remove(struct acpi_device *device, int type);
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  90
  91 static struct acpi_driver acpi_processor_driver = {
  92         .name = ACPI_PROCESSOR_DRIVER_NAME,
  93         .class = ACPI_PROCESSOR_CLASS,
  94         .ids = ACPI_PROCESSOR_HID,
  95         .ops = {
  96                 .add = acpi_processor_add,
  97                 .remove = acpi_processor_remove,
  98                 .start = acpi_processor_start,
  99                 },
 100 };
 101
 102 #define INSTALL_NOTIFY_HANDLER          1
 103 #define UNINSTALL_NOTIFY_HANDLER        2
 104
 105 static const struct file_operations acpi_processor_info_fops = {
 106         .open = acpi_processor_info_open_fs,
 107         .read = seq_read,
 108         .llseek = seq_lseek,
 109         .release = single_release,
 110 };
 111
 112 struct acpi_processor *processors[NR_CPUS];
 113 struct acpi_processor_errata errata __read_mostly;
 114
 115 /* --------------------------------------------------------------------------
 116                                 Errata Handling
 117    -------------------------------------------------------------------------- */
 118
 119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 120 {
 121         u8 rev = 0;
 122         u8 value1 = 0;
 123         u8 value2 = 0;
 124
 125
 126         if (!dev)
 127                 return -EINVAL;
 128
 129         /*
 130          * Note that 'dev' references the PIIX4 ACPI Controller.
 131          */
 132
 133         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 134
 135         switch (rev) {
 136         case 0:
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 138                 break;
 139         case 1:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 141                 break;
 142         case 2:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 144                 break;
 145         case 3:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 147                 break;
 148         default:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 150                 break;
 151         }
 152
 153         switch (rev) {
 154
 155         case 0:         /* PIIX4 A-step */
 156         case 1:         /* PIIX4 B-step */
 157                 /*
 158                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 159                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 160                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 161                  * 2002 PIIX4 specification update.  Applies to only older
 162                  * PIIX4 models.
 163                  */
 164                 errata.piix4.throttle = 1;
 165
 166         case 2:         /* PIIX4E */
 167         case 3:         /* PIIX4M */
 168                 /*
 169                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 170                  * Livelock") from the January 2002 PIIX4 specification update.
 171                  * Applies to all PIIX4 models.
 172                  */
 173
 174                 /*
 175                  * BM-IDE
 176                  * ------
 177                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 178                  * Status register address.  We'll use this later to read
 179                  * each IDE controller's DMA status to make sure we catch all
 180                  * DMA activity.
 181                  */
 182                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 183                                      PCI_DEVICE_ID_INTEL_82371AB,
 184                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 185                 if (dev) {
 186                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 187                         pci_dev_put(dev);
 188                 }
 189
 190                 /*
 191                  * Type-F DMA
 192                  * ----------
 193                  * Find the PIIX4 ISA Controller and read the Motherboard
 194                  * DMA controller's status to see if Type-F (Fast) DMA mode
 195                  * is enabled (bit 7) on either channel.  Note that we'll
 196                  * disable C3 support if this is enabled, as some legacy
 197                  * devices won't operate well if fast DMA is disabled.
 198                  */
 199                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 200                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 201                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 202                 if (dev) {
 203                         pci_read_config_byte(dev, 0x76, &value1);
 204                         pci_read_config_byte(dev, 0x77, &value2);
 205                         if ((value1 & 0x80) || (value2 & 0x80))
 206                                 errata.piix4.fdma = 1;
 207                         pci_dev_put(dev);
 208                 }
 209
 210                 break;
 211         }
 212
 213         if (errata.piix4.bmisx)
 214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 215                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 216         if (errata.piix4.fdma)
 217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 218                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 219
 220         return 0;
 221 }
 222
 223 static int acpi_processor_errata(struct acpi_processor *pr)
 224 {
 225         int result = 0;
 226         struct pci_dev *dev = NULL;
 227
 228
 229         if (!pr)
 230                 return -EINVAL;
 231
 232         /*
 233          * PIIX4
 234          */
 235         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 236                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 237                              PCI_ANY_ID, NULL);
 238         if (dev) {
 239                 result = acpi_processor_errata_piix4(dev);
 240                 pci_dev_put(dev);
 241         }
 242
 243         return result;
 244 }
 245
 246 /* --------------------------------------------------------------------------
 247                               Common ACPI processor functions
 248    -------------------------------------------------------------------------- */
 249
 250 /*
 251  * _PDC is required for a BIOS-OS handshake for most of the newer
 252  * ACPI processor features.
 253  */
 254 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 255 {
 256         struct acpi_object_list *pdc_in = pr->pdc;
 257         acpi_status status = AE_OK;
 258
 259
 260         if (!pdc_in)
 261                 return status;
 262
 263         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 264
 265         if (ACPI_FAILURE(status))
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 268
 269         return status;
 270 }
 271
 272 /* --------------------------------------------------------------------------
 273                               FS Interface (/proc)
 274    -------------------------------------------------------------------------- */
 275
 276 static struct proc_dir_entry *acpi_processor_dir = NULL;
 277
 278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 279 {
 280         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
 281
 282
 283         if (!pr)
 284                 goto end;
 285
 286         seq_printf(seq, "processor id:            %d\n"
 287                    "acpi id:                 %d\n"
 288                    "bus mastering control:   %s\n"
 289                    "power management:        %s\n"
 290                    "throttling control:      %s\n"
 291                    "limit interface:         %s\n",
 292                    pr->id,
 293                    pr->acpi_id,
 294                    pr->flags.bm_control ? "yes" : "no",
 295                    pr->flags.power ? "yes" : "no",
 296                    pr->flags.throttling ? "yes" : "no",
 297                    pr->flags.limit ? "yes" : "no");
 298
 299       end:
 300         return 0;
 301 }
 302
 303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 304 {
 305         return single_open(file, acpi_processor_info_seq_show,
 306                            PDE(inode)->data);
 307 }
 308
 309 static int acpi_processor_add_fs(struct acpi_device *device)
 310 {
 311         struct proc_dir_entry *entry = NULL;
 312
 313
 314         if (!acpi_device_dir(device)) {
 315                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 316                                                      acpi_processor_dir);
 317                 if (!acpi_device_dir(device))
 318                         return -ENODEV;
 319         }
 320         acpi_device_dir(device)->owner = THIS_MODULE;
 321
 322         /* 'info' [R] */
 323         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 324                                   S_IRUGO, acpi_device_dir(device));
 325         if (!entry)
 326                 return -EIO;
 327         else {
 328                 entry->proc_fops = &acpi_processor_info_fops;
 329                 entry->data = acpi_driver_data(device);
 330                 entry->owner = THIS_MODULE;
 331         }
 332
 333         /* 'throttling' [R/W] */
 334         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 335                                   S_IFREG | S_IRUGO | S_IWUSR,
 336                                   acpi_device_dir(device));
 337         if (!entry)
 338                 return -EIO;
 339         else {
 340                 entry->proc_fops = &acpi_processor_throttling_fops;
 341                 entry->data = acpi_driver_data(device);
 342                 entry->owner = THIS_MODULE;
 343         }
 344
 345         /* 'limit' [R/W] */
 346         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 347                                   S_IFREG | S_IRUGO | S_IWUSR,
 348                                   acpi_device_dir(device));
 349         if (!entry)
 350                 return -EIO;
 351         else {
 352                 entry->proc_fops = &acpi_processor_limit_fops;
 353                 entry->data = acpi_driver_data(device);
 354                 entry->owner = THIS_MODULE;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int acpi_processor_remove_fs(struct acpi_device *device)
 361 {
 362
 363         if (acpi_device_dir(device)) {
 364                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 365                                   acpi_device_dir(device));
 366                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 367                                   acpi_device_dir(device));
 368                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 369                                   acpi_device_dir(device));
 370                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 371                 acpi_device_dir(device) = NULL;
 372         }
 373
 374         return 0;
 375 }
 376
 377 /* Use the acpiid in MADT to map cpus in case of SMP */
 378 #ifndef CONFIG_SMP
 379 #define convert_acpiid_to_cpu(acpi_id) (-1)
 380 #else
 381
 382 #ifdef CONFIG_IA64
 383 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
 384 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 385 #define ARCH_BAD_APICID         (0xffff)
 386 #else
 387 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
 388 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 389 #define ARCH_BAD_APICID         (0xff)
 390 #endif
 391
 392 static int convert_acpiid_to_cpu(u8 acpi_id)
 393 {
 394         u16 apic_id;
 395         int i;
 396
 397         apic_id = arch_acpiid_to_apicid[acpi_id];
 398         if (apic_id == ARCH_BAD_APICID)
 399                 return -1;
 400
 401         for (i = 0; i < NR_CPUS; i++) {
 402                 if (arch_cpu_to_apicid[i] == apic_id)
 403                         return i;
 404         }
 405         return -1;
 406 }
 407 #endif
 408
 409 /* --------------------------------------------------------------------------
 410                                  Driver Interface
 411    -------------------------------------------------------------------------- */
 412
 413 static int acpi_processor_get_info(struct acpi_processor *pr)
 414 {
 415         acpi_status status = 0;
 416         union acpi_object object = { 0 };
 417         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 418         int cpu_index;
 419         static int cpu0_initialized;
 420
 421
 422         if (!pr)
 423                 return -EINVAL;
 424
 425         if (num_online_cpus() > 1)
 426                 errata.smp = TRUE;
 427
 428         acpi_processor_errata(pr);
 429
 430         /*
 431          * Check to see if we have bus mastering arbitration control.  This
 432          * is required for proper C3 usage (to maintain cache coherency).
 433          */
 434         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
 435                 pr->flags.bm_control = 1;
 436                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 437                                   "Bus mastering arbitration control present\n"));
 438         } else
 439                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 440                                   "No bus mastering arbitration control\n"));
 441
 442         /*
 443          * Evalute the processor object.  Note that it is common on SMP to
 444          * have the first (boot) processor with a valid PBLK address while
 445          * all others have a NULL address.
 446          */
 447         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 448         if (ACPI_FAILURE(status)) {
 449                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
 450                 return -ENODEV;
 451         }
 452
 453         /*
 454          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 455          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 456          */
 457         pr->acpi_id = object.processor.proc_id;
 458
 459         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
 460
 461         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 462         if (!cpu0_initialized && (cpu_index == -1) &&
 463             (num_online_cpus() == 1)) {
 464                 cpu_index = 0;
 465         }
 466
 467         cpu0_initialized = 1;
 468
 469         pr->id = cpu_index;
 470
 471         /*
 472          *  Extra Processor objects may be enumerated on MP systems with
 473          *  less than the max # of CPUs. They should be ignored _iff
 474          *  they are physically not present.
 475          */
 476         if (cpu_index == -1) {
 477                 if (ACPI_FAILURE
 478                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 479                         printk(KERN_ERR PREFIX
 480                                     "Getting cpuindex for acpiid 0x%x\n",
 481                                     pr->acpi_id);
 482                         return -ENODEV;
 483                 }
 484         }
 485
 486         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 487                           pr->acpi_id));
 488
 489         if (!object.processor.pblk_address)
 490                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 491         else if (object.processor.pblk_length != 6)
 492                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 493                             object.processor.pblk_length);
 494         else {
 495                 pr->throttling.address = object.processor.pblk_address;
 496                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
 497                 pr->throttling.duty_width = acpi_fadt.duty_width;
 498
 499                 pr->pblk = object.processor.pblk_address;
 500
 501                 /*
 502                  * We don't care about error returns - we just try to mark
 503                  * these reserved so that nobody else is confused into thinking
 504                  * that this region might be unused..
 505                  *
 506                  * (In particular, allocating the IO range for Cardbus)
 507                  */
 508                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 509         }
 510
 511 #ifdef CONFIG_CPU_FREQ
 512         acpi_processor_ppc_has_changed(pr);
 513 #endif
 514         acpi_processor_get_throttling_info(pr);
 515         acpi_processor_get_limit_info(pr);
 516
 517         return 0;
 518 }
 519
 520 static void *processor_device_array[NR_CPUS];
 521
 522 static int acpi_processor_start(struct acpi_device *device)
 523 {
 524         int result = 0;
 525         acpi_status status = AE_OK;
 526         struct acpi_processor *pr;
 527
 528
 529         pr = acpi_driver_data(device);
 530
 531         result = acpi_processor_get_info(pr);
 532         if (result) {
 533                 /* Processor is physically not present */
 534                 return 0;
 535         }
 536
 537         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 538
 539         /*
 540          * Buggy BIOS check
 541          * ACPI id of processors can be reported wrongly by the BIOS.
 542          * Don't trust it blindly
 543          */
 544         if (processor_device_array[pr->id] != NULL &&
 545             processor_device_array[pr->id] != (void *)device) {
 546                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 547                         "for the processor\n");
 548                 return -ENODEV;
 549         }
 550         processor_device_array[pr->id] = (void *)device;
 551
 552         processors[pr->id] = pr;
 553
 554         result = acpi_processor_add_fs(device);
 555         if (result)
 556                 goto end;
 557
 558         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 559                                              acpi_processor_notify, pr);
 560
 561         /* _PDC call should be done before doing anything else (if reqd.). */
 562         arch_acpi_processor_init_pdc(pr);
 563         acpi_processor_set_pdc(pr);
 564
 565         acpi_processor_power_init(pr, device);
 566
 567         if (pr->flags.throttling) {
 568                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 569                        acpi_device_name(device), acpi_device_bid(device));
 570                 printk(" %d throttling states", pr->throttling.state_count);
 571                 printk(")\n");
 572         }
 573
 574       end:
 575
 576         return result;
 577 }
 578
 579 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 580 {
 581         struct acpi_processor *pr = (struct acpi_processor *)data;
 582         struct acpi_device *device = NULL;
 583
 584
 585         if (!pr)
 586                 return;
 587
 588         if (acpi_bus_get_device(pr->handle, &device))
 589                 return;
 590
 591         switch (event) {
 592         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 593                 acpi_processor_ppc_has_changed(pr);
 594                 acpi_bus_generate_event(device, event,
 595                                         pr->performance_platform_limit);
 596                 break;
 597         case ACPI_PROCESSOR_NOTIFY_POWER:
 598                 acpi_processor_cst_has_changed(pr);
 599                 acpi_bus_generate_event(device, event, 0);
 600                 break;
 601         default:
 602                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 603                                   "Unsupported event [0x%x]\n", event));
 604                 break;
 605         }
 606
 607         return;
 608 }
 609
 610 static int acpi_processor_add(struct acpi_device *device)
 611 {
 612         struct acpi_processor *pr = NULL;
 613
 614
 615         if (!device)
 616                 return -EINVAL;
 617
 618         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 619         if (!pr)
 620                 return -ENOMEM;
 621         memset(pr, 0, sizeof(struct acpi_processor));
 622
 623         pr->handle = device->handle;
 624         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 625         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 626         acpi_driver_data(device) = pr;
 627
 628         return 0;
 629 }
 630
 631 static int acpi_processor_remove(struct acpi_device *device, int type)
 632 {
 633         acpi_status status = AE_OK;
 634         struct acpi_processor *pr = NULL;
 635
 636
 637         if (!device || !acpi_driver_data(device))
 638                 return -EINVAL;
 639
 640         pr = (struct acpi_processor *)acpi_driver_data(device);
 641
 642         if (pr->id >= NR_CPUS) {
 643                 kfree(pr);
 644                 return 0;
 645         }
 646
 647         if (type == ACPI_BUS_REMOVAL_EJECT) {
 648                 if (acpi_processor_handle_eject(pr))
 649                         return -EINVAL;
 650         }
 651
 652         acpi_processor_power_exit(pr, device);
 653
 654         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 655                                             acpi_processor_notify);
 656
 657         acpi_processor_remove_fs(device);
 658
 659         processors[pr->id] = NULL;
 660
 661         kfree(pr);
 662
 663         return 0;
 664 }
 665
 666 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 667 /****************************************************************************
 668  *      Acpi processor hotplug support                                      *
 669  ****************************************************************************/
 670
 671 static int is_processor_present(acpi_handle handle);
 672
 673 static int is_processor_present(acpi_handle handle)
 674 {
 675         acpi_status status;
 676         unsigned long sta = 0;
 677
 678
 679         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 680         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 681                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 682                 return 0;
 683         }
 684         return 1;
 685 }
 686
 687 static
 688 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 689 {
 690         acpi_handle phandle;
 691         struct acpi_device *pdev;
 692         struct acpi_processor *pr;
 693
 694
 695         if (acpi_get_parent(handle, &phandle)) {
 696                 return -ENODEV;
 697         }
 698
 699         if (acpi_bus_get_device(phandle, &pdev)) {
 700                 return -ENODEV;
 701         }
 702
 703         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 704                 return -ENODEV;
 705         }
 706
 707         acpi_bus_start(*device);
 708
 709         pr = acpi_driver_data(*device);
 710         if (!pr)
 711                 return -ENODEV;
 712
 713         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 714                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
 715         }
 716         return 0;
 717 }
 718
 719 static void
 720 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 721 {
 722         struct acpi_processor *pr;
 723         struct acpi_device *device = NULL;
 724         int result;
 725
 726
 727         switch (event) {
 728         case ACPI_NOTIFY_BUS_CHECK:
 729         case ACPI_NOTIFY_DEVICE_CHECK:
 730                 printk("Processor driver received %s event\n",
 731                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 732                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 733
 734                 if (!is_processor_present(handle))
 735                         break;
 736
 737                 if (acpi_bus_get_device(handle, &device)) {
 738                         result = acpi_processor_device_add(handle, &device);
 739                         if (result)
 740                                 printk(KERN_ERR PREFIX
 741                                             "Unable to add the device\n");
 742                         break;
 743                 }
 744
 745                 pr = acpi_driver_data(device);
 746                 if (!pr) {
 747                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 748                         break;
 749                 }
 750
 751                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 752                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 753                         break;
 754                 }
 755
 756                 result = acpi_processor_start(device);
 757                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 758                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
 759                 } else {
 760                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 761                                     acpi_device_bid(device));
 762                 }
 763                 break;
 764         case ACPI_NOTIFY_EJECT_REQUEST:
 765                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 766                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 767
 768                 if (acpi_bus_get_device(handle, &device)) {
 769                         printk(KERN_ERR PREFIX
 770                                     "Device don't exist, dropping EJECT\n");
 771                         break;
 772                 }
 773                 pr = acpi_driver_data(device);
 774                 if (!pr) {
 775                         printk(KERN_ERR PREFIX
 776                                     "Driver data is NULL, dropping EJECT\n");
 777                         return;
 778                 }
 779
 780                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 781                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 782                 break;
 783         default:
 784                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 785                                   "Unsupported event [0x%x]\n", event));
 786                 break;
 787         }
 788
 789         return;
 790 }
 791
 792 static acpi_status
 793 processor_walk_namespace_cb(acpi_handle handle,
 794                             u32 lvl, void *context, void **rv)
 795 {
 796         acpi_status status;
 797         int *action = context;
 798         acpi_object_type type = 0;
 799
 800         status = acpi_get_type(handle, &type);
 801         if (ACPI_FAILURE(status))
 802                 return (AE_OK);
 803
 804         if (type != ACPI_TYPE_PROCESSOR)
 805                 return (AE_OK);
 806
 807         switch (*action) {
 808         case INSTALL_NOTIFY_HANDLER:
 809                 acpi_install_notify_handler(handle,
 810                                             ACPI_SYSTEM_NOTIFY,
 811                                             acpi_processor_hotplug_notify,
 812                                             NULL);
 813                 break;
 814         case UNINSTALL_NOTIFY_HANDLER:
 815                 acpi_remove_notify_handler(handle,
 816                                            ACPI_SYSTEM_NOTIFY,
 817                                            acpi_processor_hotplug_notify);
 818                 break;
 819         default:
 820                 break;
 821         }
 822
 823         return (AE_OK);
 824 }
 825
 826 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 827 {
 828
 829         if (!is_processor_present(handle)) {
 830                 return AE_ERROR;
 831         }
 832
 833         if (acpi_map_lsapic(handle, p_cpu))
 834                 return AE_ERROR;
 835
 836         if (arch_register_cpu(*p_cpu)) {
 837                 acpi_unmap_lsapic(*p_cpu);
 838                 return AE_ERROR;
 839         }
 840
 841         return AE_OK;
 842 }
 843
 844 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 845 {
 846         if (cpu_online(pr->id)) {
 847                 return (-EINVAL);
 848         }
 849         arch_unregister_cpu(pr->id);
 850         acpi_unmap_lsapic(pr->id);
 851         return (0);
 852 }
 853 #else
 854 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 855 {
 856         return AE_ERROR;
 857 }
 858 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 859 {
 860         return (-EINVAL);
 861 }
 862 #endif
 863
 864 static
 865 void acpi_processor_install_hotplug_notify(void)
 866 {
 867 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 868         int action = INSTALL_NOTIFY_HANDLER;
 869         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 870                             ACPI_ROOT_OBJECT,
 871                             ACPI_UINT32_MAX,
 872                             processor_walk_namespace_cb, &action, NULL);
 873 #endif
 874 }
 875
 876 static
 877 void acpi_processor_uninstall_hotplug_notify(void)
 878 {
 879 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 880         int action = UNINSTALL_NOTIFY_HANDLER;
 881         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 882                             ACPI_ROOT_OBJECT,
 883                             ACPI_UINT32_MAX,
 884                             processor_walk_namespace_cb, &action, NULL);
 885 #endif
 886 }
 887
 888 /*
 889  * We keep the driver loaded even when ACPI is not running.
 890  * This is needed for the powernow-k8 driver, that works even without
 891  * ACPI, but needs symbols from this driver
 892  */
 893
 894 static int __init acpi_processor_init(void)
 895 {
 896         int result = 0;
 897
 898
 899         memset(&processors, 0, sizeof(processors));
 900         memset(&errata, 0, sizeof(errata));
 901
 902         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 903         if (!acpi_processor_dir)
 904                 return 0;
 905         acpi_processor_dir->owner = THIS_MODULE;
 906
 907         result = acpi_bus_register_driver(&acpi_processor_driver);
 908         if (result < 0) {
 909                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 910                 return 0;
 911         }
 912
 913         acpi_processor_install_hotplug_notify();
 914
 915         acpi_thermal_cpufreq_init();
 916
 917         acpi_processor_ppc_init();
 918
 919         return 0;
 920 }
 921
 922 static void __exit acpi_processor_exit(void)
 923 {
 924
 925         acpi_processor_ppc_exit();
 926
 927         acpi_thermal_cpufreq_exit();
 928
 929         acpi_processor_uninstall_hotplug_notify();
 930
 931         acpi_bus_unregister_driver(&acpi_processor_driver);
 932
 933         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 934
 935         return;
 936 }
 937
 938 module_init(acpi_processor_init);
 939 module_exit(acpi_processor_exit);
 940
 941 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 942
 943 MODULE_ALIAS("processor");