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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 = 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                         return -ENODEV;
 480                 }
 481         }
 482
 483         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 484                           pr->acpi_id));
 485
 486         if (!object.processor.pblk_address)
 487                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 488         else if (object.processor.pblk_length != 6)
 489                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 490                             object.processor.pblk_length);
 491         else {
 492                 pr->throttling.address = object.processor.pblk_address;
 493                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
 494                 pr->throttling.duty_width = acpi_fadt.duty_width;
 495
 496                 pr->pblk = object.processor.pblk_address;
 497
 498                 /*
 499                  * We don't care about error returns - we just try to mark
 500                  * these reserved so that nobody else is confused into thinking
 501                  * that this region might be unused..
 502                  *
 503                  * (In particular, allocating the IO range for Cardbus)
 504                  */
 505                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 506         }
 507
 508 #ifdef CONFIG_CPU_FREQ
 509         acpi_processor_ppc_has_changed(pr);
 510 #endif
 511         acpi_processor_get_throttling_info(pr);
 512         acpi_processor_get_limit_info(pr);
 513
 514         return 0;
 515 }
 516
 517 static void *processor_device_array[NR_CPUS];
 518
 519 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 520 {
 521         int result = 0;
 522         acpi_status status = AE_OK;
 523         struct acpi_processor *pr;
 524
 525
 526         pr = acpi_driver_data(device);
 527
 528         result = acpi_processor_get_info(pr);
 529         if (result) {
 530                 /* Processor is physically not present */
 531                 return 0;
 532         }
 533
 534         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 535
 536         /*
 537          * Buggy BIOS check
 538          * ACPI id of processors can be reported wrongly by the BIOS.
 539          * Don't trust it blindly
 540          */
 541         if (processor_device_array[pr->id] != NULL &&
 542             processor_device_array[pr->id] != device) {
 543                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 544                         "for the processor\n");
 545                 return -ENODEV;
 546         }
 547         processor_device_array[pr->id] = device;
 548
 549         processors[pr->id] = pr;
 550
 551         result = acpi_processor_add_fs(device);
 552         if (result)
 553                 goto end;
 554
 555         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 556                                              acpi_processor_notify, pr);
 557
 558         /* _PDC call should be done before doing anything else (if reqd.). */
 559         arch_acpi_processor_init_pdc(pr);
 560         acpi_processor_set_pdc(pr);
 561
 562         acpi_processor_power_init(pr, device);
 563
 564         if (pr->flags.throttling) {
 565                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 566                        acpi_device_name(device), acpi_device_bid(device));
 567                 printk(" %d throttling states", pr->throttling.state_count);
 568                 printk(")\n");
 569         }
 570
 571       end:
 572
 573         return result;
 574 }
 575
 576 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 577 {
 578         struct acpi_processor *pr = data;
 579         struct acpi_device *device = NULL;
 580
 581
 582         if (!pr)
 583                 return;
 584
 585         if (acpi_bus_get_device(pr->handle, &device))
 586                 return;
 587
 588         switch (event) {
 589         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 590                 acpi_processor_ppc_has_changed(pr);
 591                 acpi_bus_generate_event(device, event,
 592                                         pr->performance_platform_limit);
 593                 break;
 594         case ACPI_PROCESSOR_NOTIFY_POWER:
 595                 acpi_processor_cst_has_changed(pr);
 596                 acpi_bus_generate_event(device, event, 0);
 597                 break;
 598         default:
 599                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 600                                   "Unsupported event [0x%x]\n", event));
 601                 break;
 602         }
 603
 604         return;
 605 }
 606
 607 static int acpi_processor_add(struct acpi_device *device)
 608 {
 609         struct acpi_processor *pr = NULL;
 610
 611
 612         if (!device)
 613                 return -EINVAL;
 614
 615         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 616         if (!pr)
 617                 return -ENOMEM;
 618
 619         pr->handle = device->handle;
 620         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 621         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 622         acpi_driver_data(device) = pr;
 623
 624         return 0;
 625 }
 626
 627 static int acpi_processor_remove(struct acpi_device *device, int type)
 628 {
 629         acpi_status status = AE_OK;
 630         struct acpi_processor *pr = NULL;
 631
 632
 633         if (!device || !acpi_driver_data(device))
 634                 return -EINVAL;
 635
 636         pr = acpi_driver_data(device);
 637
 638         if (pr->id >= NR_CPUS) {
 639                 kfree(pr);
 640                 return 0;
 641         }
 642
 643         if (type == ACPI_BUS_REMOVAL_EJECT) {
 644                 if (acpi_processor_handle_eject(pr))
 645                         return -EINVAL;
 646         }
 647
 648         acpi_processor_power_exit(pr, device);
 649
 650         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 651                                             acpi_processor_notify);
 652
 653         acpi_processor_remove_fs(device);
 654
 655         processors[pr->id] = NULL;
 656
 657         kfree(pr);
 658
 659         return 0;
 660 }
 661
 662 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 663 /****************************************************************************
 664  *      Acpi processor hotplug support                                      *
 665  ****************************************************************************/
 666
 667 static int is_processor_present(acpi_handle handle);
 668
 669 static int is_processor_present(acpi_handle handle)
 670 {
 671         acpi_status status;
 672         unsigned long sta = 0;
 673
 674
 675         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 676         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 677                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 678                 return 0;
 679         }
 680         return 1;
 681 }
 682
 683 static
 684 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 685 {
 686         acpi_handle phandle;
 687         struct acpi_device *pdev;
 688         struct acpi_processor *pr;
 689
 690
 691         if (acpi_get_parent(handle, &phandle)) {
 692                 return -ENODEV;
 693         }
 694
 695         if (acpi_bus_get_device(phandle, &pdev)) {
 696                 return -ENODEV;
 697         }
 698
 699         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 700                 return -ENODEV;
 701         }
 702
 703         acpi_bus_start(*device);
 704
 705         pr = acpi_driver_data(*device);
 706         if (!pr)
 707                 return -ENODEV;
 708
 709         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 710                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
 711         }
 712         return 0;
 713 }
 714
 715 static void
 716 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 717 {
 718         struct acpi_processor *pr;
 719         struct acpi_device *device = NULL;
 720         int result;
 721
 722
 723         switch (event) {
 724         case ACPI_NOTIFY_BUS_CHECK:
 725         case ACPI_NOTIFY_DEVICE_CHECK:
 726                 printk("Processor driver received %s event\n",
 727                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 728                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 729
 730                 if (!is_processor_present(handle))
 731                         break;
 732
 733                 if (acpi_bus_get_device(handle, &device)) {
 734                         result = acpi_processor_device_add(handle, &device);
 735                         if (result)
 736                                 printk(KERN_ERR PREFIX
 737                                             "Unable to add the device\n");
 738                         break;
 739                 }
 740
 741                 pr = acpi_driver_data(device);
 742                 if (!pr) {
 743                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 744                         break;
 745                 }
 746
 747                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 748                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 749                         break;
 750                 }
 751
 752                 result = acpi_processor_start(device);
 753                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 754                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
 755                 } else {
 756                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 757                                     acpi_device_bid(device));
 758                 }
 759                 break;
 760         case ACPI_NOTIFY_EJECT_REQUEST:
 761                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 762                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 763
 764                 if (acpi_bus_get_device(handle, &device)) {
 765                         printk(KERN_ERR PREFIX
 766                                     "Device don't exist, dropping EJECT\n");
 767                         break;
 768                 }
 769                 pr = acpi_driver_data(device);
 770                 if (!pr) {
 771                         printk(KERN_ERR PREFIX
 772                                     "Driver data is NULL, dropping EJECT\n");
 773                         return;
 774                 }
 775
 776                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 777                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 778                 break;
 779         default:
 780                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 781                                   "Unsupported event [0x%x]\n", event));
 782                 break;
 783         }
 784
 785         return;
 786 }
 787
 788 static acpi_status
 789 processor_walk_namespace_cb(acpi_handle handle,
 790                             u32 lvl, void *context, void **rv)
 791 {
 792         acpi_status status;
 793         int *action = context;
 794         acpi_object_type type = 0;
 795
 796         status = acpi_get_type(handle, &type);
 797         if (ACPI_FAILURE(status))
 798                 return (AE_OK);
 799
 800         if (type != ACPI_TYPE_PROCESSOR)
 801                 return (AE_OK);
 802
 803         switch (*action) {
 804         case INSTALL_NOTIFY_HANDLER:
 805                 acpi_install_notify_handler(handle,
 806                                             ACPI_SYSTEM_NOTIFY,
 807                                             acpi_processor_hotplug_notify,
 808                                             NULL);
 809                 break;
 810         case UNINSTALL_NOTIFY_HANDLER:
 811                 acpi_remove_notify_handler(handle,
 812                                            ACPI_SYSTEM_NOTIFY,
 813                                            acpi_processor_hotplug_notify);
 814                 break;
 815         default:
 816                 break;
 817         }
 818
 819         return (AE_OK);
 820 }
 821
 822 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 823 {
 824
 825         if (!is_processor_present(handle)) {
 826                 return AE_ERROR;
 827         }
 828
 829         if (acpi_map_lsapic(handle, p_cpu))
 830                 return AE_ERROR;
 831
 832         if (arch_register_cpu(*p_cpu)) {
 833                 acpi_unmap_lsapic(*p_cpu);
 834                 return AE_ERROR;
 835         }
 836
 837         return AE_OK;
 838 }
 839
 840 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 841 {
 842         if (cpu_online(pr->id)) {
 843                 return (-EINVAL);
 844         }
 845         arch_unregister_cpu(pr->id);
 846         acpi_unmap_lsapic(pr->id);
 847         return (0);
 848 }
 849 #else
 850 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 851 {
 852         return AE_ERROR;
 853 }
 854 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 855 {
 856         return (-EINVAL);
 857 }
 858 #endif
 859
 860 static
 861 void acpi_processor_install_hotplug_notify(void)
 862 {
 863 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 864         int action = INSTALL_NOTIFY_HANDLER;
 865         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 866                             ACPI_ROOT_OBJECT,
 867                             ACPI_UINT32_MAX,
 868                             processor_walk_namespace_cb, &action, NULL);
 869 #endif
 870 }
 871
 872 static
 873 void acpi_processor_uninstall_hotplug_notify(void)
 874 {
 875 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 876         int action = UNINSTALL_NOTIFY_HANDLER;
 877         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 878                             ACPI_ROOT_OBJECT,
 879                             ACPI_UINT32_MAX,
 880                             processor_walk_namespace_cb, &action, NULL);
 881 #endif
 882 }
 883
 884 /*
 885  * We keep the driver loaded even when ACPI is not running.
 886  * This is needed for the powernow-k8 driver, that works even without
 887  * ACPI, but needs symbols from this driver
 888  */
 889
 890 static int __init acpi_processor_init(void)
 891 {
 892         int result = 0;
 893
 894
 895         memset(&processors, 0, sizeof(processors));
 896         memset(&errata, 0, sizeof(errata));
 897
 898         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 899         if (!acpi_processor_dir)
 900                 return -ENOMEM;
 901         acpi_processor_dir->owner = THIS_MODULE;
 902
 903         result = acpi_bus_register_driver(&acpi_processor_driver);
 904         if (result < 0) {
 905                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 906                 return result;
 907         }
 908
 909         acpi_processor_install_hotplug_notify();
 910
 911         acpi_thermal_cpufreq_init();
 912
 913         acpi_processor_ppc_init();
 914
 915         return 0;
 916 }
 917
 918 static void __exit acpi_processor_exit(void)
 919 {
 920
 921         acpi_processor_ppc_exit();
 922
 923         acpi_thermal_cpufreq_exit();
 924
 925         acpi_processor_uninstall_hotplug_notify();
 926
 927         acpi_bus_unregister_driver(&acpi_processor_driver);
 928
 929         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 930
 931         return;
 932 }
 933
 934 module_init(acpi_processor_init);
 935 module_exit(acpi_processor_exit);
 936
 937 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 938
 939 MODULE_ALIAS("processor");