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