drivers/acpi/processor_driver.c

   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 #ifdef CONFIG_ACPI_PROCFS
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #endif
  47 #include <linux/dmi.h>
  48 #include <linux/moduleparam.h>
  49 #include <linux/cpuidle.h>
  50 #include <linux/slab.h>
  51
  52 #include <asm/io.h>
  53 #include <asm/system.h>
  54 #include <asm/cpu.h>
  55 #include <asm/delay.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/processor.h>
  58 #include <asm/smp.h>
  59 #include <asm/acpi.h>
  60
  61 #include <acpi/acpi_bus.h>
  62 #include <acpi/acpi_drivers.h>
  63 #include <acpi/processor.h>
  64
  65 #define PREFIX "ACPI: "
  66
  67 #define ACPI_PROCESSOR_CLASS            "processor"
  68 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  69 #define ACPI_PROCESSOR_FILE_INFO        "info"
  70 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  71 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  72 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  73 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  74 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  75
  76 #define ACPI_PROCESSOR_LIMIT_USER       0
  77 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  78
  79 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  80 ACPI_MODULE_NAME("processor_driver");
  81
  82 MODULE_AUTHOR("Paul Diefenbaugh");
  83 MODULE_DESCRIPTION("ACPI Processor Driver");
  84 MODULE_LICENSE("GPL");
  85
  86 static int acpi_processor_add(struct acpi_device *device);
  87 static int acpi_processor_remove(struct acpi_device *device, int type);
  88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  91
  92
  93 static const struct acpi_device_id processor_device_ids[] = {
  94         {ACPI_PROCESSOR_OBJECT_HID, 0},
  95         {"ACPI0007", 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  99
 100 static struct acpi_driver acpi_processor_driver = {
 101         .name = "processor",
 102         .class = ACPI_PROCESSOR_CLASS,
 103         .ids = processor_device_ids,
 104         .ops = {
 105                 .add = acpi_processor_add,
 106                 .remove = acpi_processor_remove,
 107                 .suspend = acpi_processor_suspend,
 108                 .resume = acpi_processor_resume,
 109                 .notify = acpi_processor_notify,
 110                 },
 111 };
 112
 113 #define INSTALL_NOTIFY_HANDLER          1
 114 #define UNINSTALL_NOTIFY_HANDLER        2
 115
 116 DEFINE_PER_CPU(struct acpi_processor *, processors);
 117 EXPORT_PER_CPU_SYMBOL(processors);
 118
 119 struct acpi_processor_errata errata __read_mostly;
 120
 121 /* --------------------------------------------------------------------------
 122                                 Errata Handling
 123    -------------------------------------------------------------------------- */
 124
 125 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 126 {
 127         u8 value1 = 0;
 128         u8 value2 = 0;
 129
 130
 131         if (!dev)
 132                 return -EINVAL;
 133
 134         /*
 135          * Note that 'dev' references the PIIX4 ACPI Controller.
 136          */
 137
 138         switch (dev->revision) {
 139         case 0:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 141                 break;
 142         case 1:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 144                 break;
 145         case 2:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 147                 break;
 148         case 3:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 150                 break;
 151         default:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 153                 break;
 154         }
 155
 156         switch (dev->revision) {
 157
 158         case 0:         /* PIIX4 A-step */
 159         case 1:         /* PIIX4 B-step */
 160                 /*
 161                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 162                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 163                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 164                  * 2002 PIIX4 specification update.  Applies to only older
 165                  * PIIX4 models.
 166                  */
 167                 errata.piix4.throttle = 1;
 168
 169         case 2:         /* PIIX4E */
 170         case 3:         /* PIIX4M */
 171                 /*
 172                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 173                  * Livelock") from the January 2002 PIIX4 specification update.
 174                  * Applies to all PIIX4 models.
 175                  */
 176
 177                 /*
 178                  * BM-IDE
 179                  * ------
 180                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 181                  * Status register address.  We'll use this later to read
 182                  * each IDE controller's DMA status to make sure we catch all
 183                  * DMA activity.
 184                  */
 185                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 186                                      PCI_DEVICE_ID_INTEL_82371AB,
 187                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 188                 if (dev) {
 189                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 190                         pci_dev_put(dev);
 191                 }
 192
 193                 /*
 194                  * Type-F DMA
 195                  * ----------
 196                  * Find the PIIX4 ISA Controller and read the Motherboard
 197                  * DMA controller's status to see if Type-F (Fast) DMA mode
 198                  * is enabled (bit 7) on either channel.  Note that we'll
 199                  * disable C3 support if this is enabled, as some legacy
 200                  * devices won't operate well if fast DMA is disabled.
 201                  */
 202                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 203                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 204                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 205                 if (dev) {
 206                         pci_read_config_byte(dev, 0x76, &value1);
 207                         pci_read_config_byte(dev, 0x77, &value2);
 208                         if ((value1 & 0x80) || (value2 & 0x80))
 209                                 errata.piix4.fdma = 1;
 210                         pci_dev_put(dev);
 211                 }
 212
 213                 break;
 214         }
 215
 216         if (errata.piix4.bmisx)
 217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 218                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 219         if (errata.piix4.fdma)
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 221                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 222
 223         return 0;
 224 }
 225
 226 static int acpi_processor_errata(struct acpi_processor *pr)
 227 {
 228         int result = 0;
 229         struct pci_dev *dev = NULL;
 230
 231
 232         if (!pr)
 233                 return -EINVAL;
 234
 235         /*
 236          * PIIX4
 237          */
 238         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 239                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 240                              PCI_ANY_ID, NULL);
 241         if (dev) {
 242                 result = acpi_processor_errata_piix4(dev);
 243                 pci_dev_put(dev);
 244         }
 245
 246         return result;
 247 }
 248
 249 #ifdef CONFIG_ACPI_PROCFS
 250 static struct proc_dir_entry *acpi_processor_dir = NULL;
 251
 252 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 253 {
 254         struct proc_dir_entry *entry = NULL;
 255
 256
 257         if (!acpi_device_dir(device)) {
 258                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 259                                                      acpi_processor_dir);
 260                 if (!acpi_device_dir(device))
 261                         return -ENODEV;
 262         }
 263
 264         /* 'throttling' [R/W] */
 265         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 266                                  S_IFREG | S_IRUGO | S_IWUSR,
 267                                  acpi_device_dir(device),
 268                                  &acpi_processor_throttling_fops,
 269                                  acpi_driver_data(device));
 270         if (!entry)
 271                 return -EIO;
 272         return 0;
 273 }
 274 static int acpi_processor_remove_fs(struct acpi_device *device)
 275 {
 276
 277         if (acpi_device_dir(device)) {
 278                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 279                                   acpi_device_dir(device));
 280                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 281                 acpi_device_dir(device) = NULL;
 282         }
 283
 284         return 0;
 285 }
 286 #else
 287 static inline int acpi_processor_add_fs(struct acpi_device *device)
 288 {
 289         return 0;
 290 }
 291 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 292 {
 293         return 0;
 294 }
 295 #endif
 296 /* --------------------------------------------------------------------------
 297                                  Driver Interface
 298    -------------------------------------------------------------------------- */
 299
 300 static int acpi_processor_get_info(struct acpi_device *device)
 301 {
 302         acpi_status status = 0;
 303         union acpi_object object = { 0 };
 304         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 305         struct acpi_processor *pr;
 306         int cpu_index, device_declaration = 0;
 307         static int cpu0_initialized;
 308
 309         pr = acpi_driver_data(device);
 310         if (!pr)
 311                 return -EINVAL;
 312
 313         if (num_online_cpus() > 1)
 314                 errata.smp = TRUE;
 315
 316         acpi_processor_errata(pr);
 317
 318         /*
 319          * Check to see if we have bus mastering arbitration control.  This
 320          * is required for proper C3 usage (to maintain cache coherency).
 321          */
 322         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 323                 pr->flags.bm_control = 1;
 324                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 325                                   "Bus mastering arbitration control present\n"));
 326         } else
 327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 328                                   "No bus mastering arbitration control\n"));
 329
 330         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 331                 /* Declared with "Processor" statement; match ProcessorID */
 332                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 333                 if (ACPI_FAILURE(status)) {
 334                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 335                         return -ENODEV;
 336                 }
 337
 338                 /*
 339                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 340                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 341                  *      arch/xxx/acpi.c
 342                  */
 343                 pr->acpi_id = object.processor.proc_id;
 344         } else {
 345                 /*
 346                  * Declared with "Device" statement; match _UID.
 347                  * Note that we don't handle string _UIDs yet.
 348                  */
 349                 unsigned long long value;
 350                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 351                                                 NULL, &value);
 352                 if (ACPI_FAILURE(status)) {
 353                         printk(KERN_ERR PREFIX
 354                             "Evaluating processor _UID [%#x]\n", status);
 355                         return -ENODEV;
 356                 }
 357                 device_declaration = 1;
 358                 pr->acpi_id = value;
 359         }
 360         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
 361
 362         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 363         if (!cpu0_initialized && (cpu_index == -1) &&
 364             (num_online_cpus() == 1)) {
 365                 cpu_index = 0;
 366         }
 367
 368         cpu0_initialized = 1;
 369
 370         pr->id = cpu_index;
 371
 372         /*
 373          *  Extra Processor objects may be enumerated on MP systems with
 374          *  less than the max # of CPUs. They should be ignored _iff
 375          *  they are physically not present.
 376          */
 377         if (pr->id == -1) {
 378                 if (ACPI_FAILURE
 379                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 380                         return -ENODEV;
 381                 }
 382         }
 383         /*
 384          * On some boxes several processors use the same processor bus id.
 385          * But they are located in different scope. For example:
 386          * \_SB.SCK0.CPU0
 387          * \_SB.SCK1.CPU0
 388          * Rename the processor device bus id. And the new bus id will be
 389          * generated as the following format:
 390          * CPU+CPU ID.
 391          */
 392         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 393         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 394                           pr->acpi_id));
 395
 396         if (!object.processor.pblk_address)
 397                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 398         else if (object.processor.pblk_length != 6)
 399                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 400                             object.processor.pblk_length);
 401         else {
 402                 pr->throttling.address = object.processor.pblk_address;
 403                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 404                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 405
 406                 pr->pblk = object.processor.pblk_address;
 407
 408                 /*
 409                  * We don't care about error returns - we just try to mark
 410                  * these reserved so that nobody else is confused into thinking
 411                  * that this region might be unused..
 412                  *
 413                  * (In particular, allocating the IO range for Cardbus)
 414                  */
 415                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 416         }
 417
 418         /*
 419          * If ACPI describes a slot number for this CPU, we can use it
 420          * ensure we get the right value in the "physical id" field
 421          * of /proc/cpuinfo
 422          */
 423         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 424         if (ACPI_SUCCESS(status))
 425                 arch_fix_phys_package_id(pr->id, object.integer.value);
 426
 427         return 0;
 428 }
 429
 430 static DEFINE_PER_CPU(void *, processor_device_array);
 431
 432 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 433 {
 434         struct acpi_processor *pr = acpi_driver_data(device);
 435         int saved;
 436
 437         if (!pr)
 438                 return;
 439
 440         switch (event) {
 441         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 442                 saved = pr->performance_platform_limit;
 443                 acpi_processor_ppc_has_changed(pr, 1);
 444                 if (saved == pr->performance_platform_limit)
 445                         break;
 446                 acpi_bus_generate_proc_event(device, event,
 447                                         pr->performance_platform_limit);
 448                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 449                                                   dev_name(&device->dev), event,
 450                                                   pr->performance_platform_limit);
 451                 break;
 452         case ACPI_PROCESSOR_NOTIFY_POWER:
 453                 acpi_processor_cst_has_changed(pr);
 454                 acpi_bus_generate_proc_event(device, event, 0);
 455                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 456                                                   dev_name(&device->dev), event, 0);
 457                 break;
 458         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 459                 acpi_processor_tstate_has_changed(pr);
 460                 acpi_bus_generate_proc_event(device, event, 0);
 461                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 462                                                   dev_name(&device->dev), event, 0);
 463         default:
 464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 465                                   "Unsupported event [0x%x]\n", event));
 466                 break;
 467         }
 468
 469         return;
 470 }
 471
 472 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 473                 unsigned long action, void *hcpu)
 474 {
 475         unsigned int cpu = (unsigned long)hcpu;
 476         struct acpi_processor *pr = per_cpu(processors, cpu);
 477
 478         if (action == CPU_ONLINE && pr) {
 479                 acpi_processor_ppc_has_changed(pr, 0);
 480                 acpi_processor_cst_has_changed(pr);
 481                 acpi_processor_tstate_has_changed(pr);
 482         }
 483         return NOTIFY_OK;
 484 }
 485
 486 static struct notifier_block acpi_cpu_notifier =
 487 {
 488             .notifier_call = acpi_cpu_soft_notify,
 489 };
 490
 491 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 492 {
 493         struct acpi_processor *pr = NULL;
 494         int result = 0;
 495         struct sys_device *sysdev;
 496
 497         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 498         if (!pr)
 499                 return -ENOMEM;
 500
 501         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 502                 kfree(pr);
 503                 return -ENOMEM;
 504         }
 505
 506         pr->handle = device->handle;
 507         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 508         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 509         device->driver_data = pr;
 510
 511         result = acpi_processor_get_info(device);
 512         if (result) {
 513                 /* Processor is physically not present */
 514                 return 0;
 515         }
 516
 517 #ifdef CONFIG_SMP
 518         if (pr->id >= setup_max_cpus && pr->id != 0)
 519                 return 0;
 520 #endif
 521
 522         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 523
 524         /*
 525          * Buggy BIOS check
 526          * ACPI id of processors can be reported wrongly by the BIOS.
 527          * Don't trust it blindly
 528          */
 529         if (per_cpu(processor_device_array, pr->id) != NULL &&
 530             per_cpu(processor_device_array, pr->id) != device) {
 531                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 532                         "for the processor\n");
 533                 result = -ENODEV;
 534                 goto err_free_cpumask;
 535         }
 536         per_cpu(processor_device_array, pr->id) = device;
 537
 538         per_cpu(processors, pr->id) = pr;
 539
 540         result = acpi_processor_add_fs(device);
 541         if (result)
 542                 goto err_free_cpumask;
 543
 544         sysdev = get_cpu_sysdev(pr->id);
 545         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 546                 result = -EFAULT;
 547                 goto err_remove_fs;
 548         }
 549
 550 #ifdef CONFIG_CPU_FREQ
 551         acpi_processor_ppc_has_changed(pr, 0);
 552 #endif
 553         acpi_processor_get_throttling_info(pr);
 554         acpi_processor_get_limit_info(pr);
 555
 556
 557         if (cpuidle_get_driver() == &acpi_idle_driver)
 558                 acpi_processor_power_init(pr, device);
 559
 560         pr->cdev = thermal_cooling_device_register("Processor", device,
 561                                                 &processor_cooling_ops);
 562         if (IS_ERR(pr->cdev)) {
 563                 result = PTR_ERR(pr->cdev);
 564                 goto err_power_exit;
 565         }
 566
 567         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 568                  pr->cdev->id);
 569
 570         result = sysfs_create_link(&device->dev.kobj,
 571                                    &pr->cdev->device.kobj,
 572                                    "thermal_cooling");
 573         if (result) {
 574                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 575                 goto err_thermal_unregister;
 576         }
 577         result = sysfs_create_link(&pr->cdev->device.kobj,
 578                                    &device->dev.kobj,
 579                                    "device");
 580         if (result) {
 581                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 582                 goto err_remove_sysfs;
 583         }
 584
 585         return 0;
 586
 587 err_remove_sysfs:
 588         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 589 err_thermal_unregister:
 590         thermal_cooling_device_unregister(pr->cdev);
 591 err_power_exit:
 592         acpi_processor_power_exit(pr, device);
 593 err_remove_fs:
 594         acpi_processor_remove_fs(device);
 595 err_free_cpumask:
 596         free_cpumask_var(pr->throttling.shared_cpu_map);
 597
 598         return result;
 599 }
 600
 601 static int acpi_processor_remove(struct acpi_device *device, int type)
 602 {
 603         struct acpi_processor *pr = NULL;
 604
 605
 606         if (!device || !acpi_driver_data(device))
 607                 return -EINVAL;
 608
 609         pr = acpi_driver_data(device);
 610
 611         if (pr->id >= nr_cpu_ids)
 612                 goto free;
 613
 614         if (type == ACPI_BUS_REMOVAL_EJECT) {
 615                 if (acpi_processor_handle_eject(pr))
 616                         return -EINVAL;
 617         }
 618
 619         acpi_processor_power_exit(pr, device);
 620
 621         sysfs_remove_link(&device->dev.kobj, "sysdev");
 622
 623         acpi_processor_remove_fs(device);
 624
 625         if (pr->cdev) {
 626                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 627                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 628                 thermal_cooling_device_unregister(pr->cdev);
 629                 pr->cdev = NULL;
 630         }
 631
 632         per_cpu(processors, pr->id) = NULL;
 633         per_cpu(processor_device_array, pr->id) = NULL;
 634
 635 free:
 636         free_cpumask_var(pr->throttling.shared_cpu_map);
 637         kfree(pr);
 638
 639         return 0;
 640 }
 641
 642 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 643 /****************************************************************************
 644  *      Acpi processor hotplug support                                      *
 645  ****************************************************************************/
 646
 647 static int is_processor_present(acpi_handle handle)
 648 {
 649         acpi_status status;
 650         unsigned long long sta = 0;
 651
 652
 653         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 654
 655         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 656                 return 1;
 657
 658         /*
 659          * _STA is mandatory for a processor that supports hot plug
 660          */
 661         if (status == AE_NOT_FOUND)
 662                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 663                                 "Processor does not support hot plug\n"));
 664         else
 665                 ACPI_EXCEPTION((AE_INFO, status,
 666                                 "Processor Device is not present"));
 667         return 0;
 668 }
 669
 670 static
 671 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 672 {
 673         acpi_handle phandle;
 674         struct acpi_device *pdev;
 675
 676
 677         if (acpi_get_parent(handle, &phandle)) {
 678                 return -ENODEV;
 679         }
 680
 681         if (acpi_bus_get_device(phandle, &pdev)) {
 682                 return -ENODEV;
 683         }
 684
 685         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 686                 return -ENODEV;
 687         }
 688
 689         return 0;
 690 }
 691
 692 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 693                                                 u32 event, void *data)
 694 {
 695         struct acpi_processor *pr;
 696         struct acpi_device *device = NULL;
 697         int result;
 698
 699
 700         switch (event) {
 701         case ACPI_NOTIFY_BUS_CHECK:
 702         case ACPI_NOTIFY_DEVICE_CHECK:
 703                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 704                 "Processor driver received %s event\n",
 705                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 706                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 707
 708                 if (!is_processor_present(handle))
 709                         break;
 710
 711                 if (acpi_bus_get_device(handle, &device)) {
 712                         result = acpi_processor_device_add(handle, &device);
 713                         if (result)
 714                                 printk(KERN_ERR PREFIX
 715                                             "Unable to add the device\n");
 716                         break;
 717                 }
 718                 break;
 719         case ACPI_NOTIFY_EJECT_REQUEST:
 720                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 721                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 722
 723                 if (acpi_bus_get_device(handle, &device)) {
 724                         printk(KERN_ERR PREFIX
 725                                     "Device don't exist, dropping EJECT\n");
 726                         break;
 727                 }
 728                 pr = acpi_driver_data(device);
 729                 if (!pr) {
 730                         printk(KERN_ERR PREFIX
 731                                     "Driver data is NULL, dropping EJECT\n");
 732                         return;
 733                 }
 734                 break;
 735         default:
 736                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 737                                   "Unsupported event [0x%x]\n", event));
 738                 break;
 739         }
 740
 741         return;
 742 }
 743
 744 static acpi_status
 745 processor_walk_namespace_cb(acpi_handle handle,
 746                             u32 lvl, void *context, void **rv)
 747 {
 748         acpi_status status;
 749         int *action = context;
 750         acpi_object_type type = 0;
 751
 752         status = acpi_get_type(handle, &type);
 753         if (ACPI_FAILURE(status))
 754                 return (AE_OK);
 755
 756         if (type != ACPI_TYPE_PROCESSOR)
 757                 return (AE_OK);
 758
 759         switch (*action) {
 760         case INSTALL_NOTIFY_HANDLER:
 761                 acpi_install_notify_handler(handle,
 762                                             ACPI_SYSTEM_NOTIFY,
 763                                             acpi_processor_hotplug_notify,
 764                                             NULL);
 765                 break;
 766         case UNINSTALL_NOTIFY_HANDLER:
 767                 acpi_remove_notify_handler(handle,
 768                                            ACPI_SYSTEM_NOTIFY,
 769                                            acpi_processor_hotplug_notify);
 770                 break;
 771         default:
 772                 break;
 773         }
 774
 775         return (AE_OK);
 776 }
 777
 778 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 779 {
 780
 781         if (!is_processor_present(handle)) {
 782                 return AE_ERROR;
 783         }
 784
 785         if (acpi_map_lsapic(handle, p_cpu))
 786                 return AE_ERROR;
 787
 788         if (arch_register_cpu(*p_cpu)) {
 789                 acpi_unmap_lsapic(*p_cpu);
 790                 return AE_ERROR;
 791         }
 792
 793         return AE_OK;
 794 }
 795
 796 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 797 {
 798         if (cpu_online(pr->id))
 799                 cpu_down(pr->id);
 800
 801         arch_unregister_cpu(pr->id);
 802         acpi_unmap_lsapic(pr->id);
 803         return (0);
 804 }
 805 #else
 806 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 807 {
 808         return AE_ERROR;
 809 }
 810 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 811 {
 812         return (-EINVAL);
 813 }
 814 #endif
 815
 816 static
 817 void acpi_processor_install_hotplug_notify(void)
 818 {
 819 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 820         int action = INSTALL_NOTIFY_HANDLER;
 821         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 822                             ACPI_ROOT_OBJECT,
 823                             ACPI_UINT32_MAX,
 824                             processor_walk_namespace_cb, NULL, &action, NULL);
 825 #endif
 826         register_hotcpu_notifier(&acpi_cpu_notifier);
 827 }
 828
 829 static
 830 void acpi_processor_uninstall_hotplug_notify(void)
 831 {
 832 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 833         int action = UNINSTALL_NOTIFY_HANDLER;
 834         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 835                             ACPI_ROOT_OBJECT,
 836                             ACPI_UINT32_MAX,
 837                             processor_walk_namespace_cb, NULL, &action, NULL);
 838 #endif
 839         unregister_hotcpu_notifier(&acpi_cpu_notifier);
 840 }
 841
 842 /*
 843  * We keep the driver loaded even when ACPI is not running.
 844  * This is needed for the powernow-k8 driver, that works even without
 845  * ACPI, but needs symbols from this driver
 846  */
 847
 848 static int __init acpi_processor_init(void)
 849 {
 850         int result = 0;
 851
 852         if (acpi_disabled)
 853                 return 0;
 854
 855         memset(&errata, 0, sizeof(errata));
 856
 857 #ifdef CONFIG_ACPI_PROCFS
 858         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 859         if (!acpi_processor_dir)
 860                 return -ENOMEM;
 861 #endif
 862
 863         if (!cpuidle_register_driver(&acpi_idle_driver)) {
 864                 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
 865                         acpi_idle_driver.name);
 866         } else {
 867                 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
 868                         cpuidle_get_driver()->name);
 869         }
 870
 871         result = acpi_bus_register_driver(&acpi_processor_driver);
 872         if (result < 0)
 873                 goto out_cpuidle;
 874
 875         acpi_processor_install_hotplug_notify();
 876
 877         acpi_thermal_cpufreq_init();
 878
 879         acpi_processor_ppc_init();
 880
 881         acpi_processor_throttling_init();
 882
 883         return 0;
 884
 885 out_cpuidle:
 886         cpuidle_unregister_driver(&acpi_idle_driver);
 887
 888 #ifdef CONFIG_ACPI_PROCFS
 889         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 890 #endif
 891
 892         return result;
 893 }
 894
 895 static void __exit acpi_processor_exit(void)
 896 {
 897         if (acpi_disabled)
 898                 return;
 899
 900         acpi_processor_ppc_exit();
 901
 902         acpi_thermal_cpufreq_exit();
 903
 904         acpi_processor_uninstall_hotplug_notify();
 905
 906         acpi_bus_unregister_driver(&acpi_processor_driver);
 907
 908         cpuidle_unregister_driver(&acpi_idle_driver);
 909
 910 #ifdef CONFIG_ACPI_PROCFS
 911         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 912 #endif
 913
 914         return;
 915 }
 916
 917 module_init(acpi_processor_init);
 918 module_exit(acpi_processor_exit);
 919
 920 MODULE_ALIAS("processor");