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
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define PREFIX "ACPI: "
  63
  64 #define ACPI_PROCESSOR_CLASS            "processor"
  65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  66 #define ACPI_PROCESSOR_FILE_INFO        "info"
  67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  72
  73 #define ACPI_PROCESSOR_LIMIT_USER       0
  74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("processor_driver");
  78
  79 MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION("ACPI Processor Driver");
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 #ifdef CONFIG_ACPI_PROCFS
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 #endif
  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 #ifdef CONFIG_ACPI_PROCFS
 116 static const struct file_operations acpi_processor_info_fops = {
 117         .owner = THIS_MODULE,
 118         .open = acpi_processor_info_open_fs,
 119         .read = seq_read,
 120         .llseek = seq_lseek,
 121         .release = single_release,
 122 };
 123 #endif
 124
 125 DEFINE_PER_CPU(struct acpi_processor *, processors);
 126 EXPORT_PER_CPU_SYMBOL(processors);
 127
 128 struct acpi_processor_errata errata __read_mostly;
 129
 130 /* --------------------------------------------------------------------------
 131                                 Errata Handling
 132    -------------------------------------------------------------------------- */
 133
 134 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 135 {
 136         u8 value1 = 0;
 137         u8 value2 = 0;
 138
 139
 140         if (!dev)
 141                 return -EINVAL;
 142
 143         /*
 144          * Note that 'dev' references the PIIX4 ACPI Controller.
 145          */
 146
 147         switch (dev->revision) {
 148         case 0:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 150                 break;
 151         case 1:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 153                 break;
 154         case 2:
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 156                 break;
 157         case 3:
 158                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 159                 break;
 160         default:
 161                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 162                 break;
 163         }
 164
 165         switch (dev->revision) {
 166
 167         case 0:         /* PIIX4 A-step */
 168         case 1:         /* PIIX4 B-step */
 169                 /*
 170                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 171                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 172                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 173                  * 2002 PIIX4 specification update.  Applies to only older
 174                  * PIIX4 models.
 175                  */
 176                 errata.piix4.throttle = 1;
 177
 178         case 2:         /* PIIX4E */
 179         case 3:         /* PIIX4M */
 180                 /*
 181                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 182                  * Livelock") from the January 2002 PIIX4 specification update.
 183                  * Applies to all PIIX4 models.
 184                  */
 185
 186                 /*
 187                  * BM-IDE
 188                  * ------
 189                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 190                  * Status register address.  We'll use this later to read
 191                  * each IDE controller's DMA status to make sure we catch all
 192                  * DMA activity.
 193                  */
 194                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 195                                      PCI_DEVICE_ID_INTEL_82371AB,
 196                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 197                 if (dev) {
 198                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 199                         pci_dev_put(dev);
 200                 }
 201
 202                 /*
 203                  * Type-F DMA
 204                  * ----------
 205                  * Find the PIIX4 ISA Controller and read the Motherboard
 206                  * DMA controller's status to see if Type-F (Fast) DMA mode
 207                  * is enabled (bit 7) on either channel.  Note that we'll
 208                  * disable C3 support if this is enabled, as some legacy
 209                  * devices won't operate well if fast DMA is disabled.
 210                  */
 211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 212                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 214                 if (dev) {
 215                         pci_read_config_byte(dev, 0x76, &value1);
 216                         pci_read_config_byte(dev, 0x77, &value2);
 217                         if ((value1 & 0x80) || (value2 & 0x80))
 218                                 errata.piix4.fdma = 1;
 219                         pci_dev_put(dev);
 220                 }
 221
 222                 break;
 223         }
 224
 225         if (errata.piix4.bmisx)
 226                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 227                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 228         if (errata.piix4.fdma)
 229                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 230                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 231
 232         return 0;
 233 }
 234
 235 static int acpi_processor_errata(struct acpi_processor *pr)
 236 {
 237         int result = 0;
 238         struct pci_dev *dev = NULL;
 239
 240
 241         if (!pr)
 242                 return -EINVAL;
 243
 244         /*
 245          * PIIX4
 246          */
 247         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 248                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 249                              PCI_ANY_ID, NULL);
 250         if (dev) {
 251                 result = acpi_processor_errata_piix4(dev);
 252                 pci_dev_put(dev);
 253         }
 254
 255         return result;
 256 }
 257
 258 /* --------------------------------------------------------------------------
 259                               FS Interface (/proc)
 260    -------------------------------------------------------------------------- */
 261
 262 #ifdef CONFIG_ACPI_PROCFS
 263 static struct proc_dir_entry *acpi_processor_dir = NULL;
 264
 265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 266 {
 267         struct acpi_processor *pr = seq->private;
 268
 269
 270         if (!pr)
 271                 goto end;
 272
 273         seq_printf(seq, "processor id:            %d\n"
 274                    "acpi id:                 %d\n"
 275                    "bus mastering control:   %s\n"
 276                    "power management:        %s\n"
 277                    "throttling control:      %s\n"
 278                    "limit interface:         %s\n",
 279                    pr->id,
 280                    pr->acpi_id,
 281                    pr->flags.bm_control ? "yes" : "no",
 282                    pr->flags.power ? "yes" : "no",
 283                    pr->flags.throttling ? "yes" : "no",
 284                    pr->flags.limit ? "yes" : "no");
 285
 286       end:
 287         return 0;
 288 }
 289
 290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 291 {
 292         return single_open(file, acpi_processor_info_seq_show,
 293                            PDE(inode)->data);
 294 }
 295
 296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 297 {
 298         struct proc_dir_entry *entry = NULL;
 299
 300
 301         if (!acpi_device_dir(device)) {
 302                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 303                                                      acpi_processor_dir);
 304                 if (!acpi_device_dir(device))
 305                         return -ENODEV;
 306         }
 307
 308         /* 'info' [R] */
 309         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 310                                  S_IRUGO, acpi_device_dir(device),
 311                                  &acpi_processor_info_fops,
 312                                  acpi_driver_data(device));
 313         if (!entry)
 314                 return -EIO;
 315
 316         /* 'throttling' [R/W] */
 317         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 318                                  S_IFREG | S_IRUGO | S_IWUSR,
 319                                  acpi_device_dir(device),
 320                                  &acpi_processor_throttling_fops,
 321                                  acpi_driver_data(device));
 322         if (!entry)
 323                 return -EIO;
 324
 325         /* 'limit' [R/W] */
 326         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 327                                  S_IFREG | S_IRUGO | S_IWUSR,
 328                                  acpi_device_dir(device),
 329                                  &acpi_processor_limit_fops,
 330                                  acpi_driver_data(device));
 331         if (!entry)
 332                 return -EIO;
 333         return 0;
 334 }
 335 static int acpi_processor_remove_fs(struct acpi_device *device)
 336 {
 337
 338         if (acpi_device_dir(device)) {
 339                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 340                                   acpi_device_dir(device));
 341                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 342                                   acpi_device_dir(device));
 343                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 344                                   acpi_device_dir(device));
 345                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 346                 acpi_device_dir(device) = NULL;
 347         }
 348
 349         return 0;
 350 }
 351 #else
 352 static inline int acpi_processor_add_fs(struct acpi_device *device)
 353 {
 354         return 0;
 355 }
 356 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 357 {
 358         return 0;
 359 }
 360 #endif
 361
 362 /* --------------------------------------------------------------------------
 363                                  Driver Interface
 364    -------------------------------------------------------------------------- */
 365
 366 static int acpi_processor_get_info(struct acpi_device *device)
 367 {
 368         acpi_status status = 0;
 369         union acpi_object object = { 0 };
 370         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 371         struct acpi_processor *pr;
 372         int cpu_index, device_declaration = 0;
 373         static int cpu0_initialized;
 374
 375         pr = acpi_driver_data(device);
 376         if (!pr)
 377                 return -EINVAL;
 378
 379         if (num_online_cpus() > 1)
 380                 errata.smp = TRUE;
 381
 382         acpi_processor_errata(pr);
 383
 384         /*
 385          * Check to see if we have bus mastering arbitration control.  This
 386          * is required for proper C3 usage (to maintain cache coherency).
 387          */
 388         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 389                 pr->flags.bm_control = 1;
 390                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 391                                   "Bus mastering arbitration control present\n"));
 392         } else
 393                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 394                                   "No bus mastering arbitration control\n"));
 395
 396         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 397                 /* Declared with "Processor" statement; match ProcessorID */
 398                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 399                 if (ACPI_FAILURE(status)) {
 400                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 401                         return -ENODEV;
 402                 }
 403
 404                 /*
 405                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 406                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 407                  *      arch/xxx/acpi.c
 408                  */
 409                 pr->acpi_id = object.processor.proc_id;
 410         } else {
 411                 /*
 412                  * Declared with "Device" statement; match _UID.
 413                  * Note that we don't handle string _UIDs yet.
 414                  */
 415                 unsigned long long value;
 416                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 417                                                 NULL, &value);
 418                 if (ACPI_FAILURE(status)) {
 419                         printk(KERN_ERR PREFIX
 420                             "Evaluating processor _UID [%#x]\n", status);
 421                         return -ENODEV;
 422                 }
 423                 device_declaration = 1;
 424                 pr->acpi_id = value;
 425         }
 426         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
 427
 428         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 429         if (!cpu0_initialized && (cpu_index == -1) &&
 430             (num_online_cpus() == 1)) {
 431                 cpu_index = 0;
 432         }
 433
 434         cpu0_initialized = 1;
 435
 436         pr->id = cpu_index;
 437
 438         /*
 439          *  Extra Processor objects may be enumerated on MP systems with
 440          *  less than the max # of CPUs. They should be ignored _iff
 441          *  they are physically not present.
 442          */
 443         if (pr->id == -1) {
 444                 if (ACPI_FAILURE
 445                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 446                         return -ENODEV;
 447                 }
 448         }
 449         /*
 450          * On some boxes several processors use the same processor bus id.
 451          * But they are located in different scope. For example:
 452          * \_SB.SCK0.CPU0
 453          * \_SB.SCK1.CPU0
 454          * Rename the processor device bus id. And the new bus id will be
 455          * generated as the following format:
 456          * CPU+CPU ID.
 457          */
 458         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 459         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 460                           pr->acpi_id));
 461
 462         if (!object.processor.pblk_address)
 463                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 464         else if (object.processor.pblk_length != 6)
 465                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 466                             object.processor.pblk_length);
 467         else {
 468                 pr->throttling.address = object.processor.pblk_address;
 469                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 470                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 471
 472                 pr->pblk = object.processor.pblk_address;
 473
 474                 /*
 475                  * We don't care about error returns - we just try to mark
 476                  * these reserved so that nobody else is confused into thinking
 477                  * that this region might be unused..
 478                  *
 479                  * (In particular, allocating the IO range for Cardbus)
 480                  */
 481                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 482         }
 483
 484         /*
 485          * If ACPI describes a slot number for this CPU, we can use it
 486          * ensure we get the right value in the "physical id" field
 487          * of /proc/cpuinfo
 488          */
 489         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 490         if (ACPI_SUCCESS(status))
 491                 arch_fix_phys_package_id(pr->id, object.integer.value);
 492
 493         return 0;
 494 }
 495
 496 static DEFINE_PER_CPU(void *, processor_device_array);
 497
 498 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 499 {
 500         struct acpi_processor *pr = acpi_driver_data(device);
 501         int saved;
 502
 503         if (!pr)
 504                 return;
 505
 506         switch (event) {
 507         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 508                 saved = pr->performance_platform_limit;
 509                 acpi_processor_ppc_has_changed(pr, 1);
 510                 if (saved == pr->performance_platform_limit)
 511                         break;
 512                 acpi_bus_generate_proc_event(device, event,
 513                                         pr->performance_platform_limit);
 514                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 515                                                   dev_name(&device->dev), event,
 516                                                   pr->performance_platform_limit);
 517                 break;
 518         case ACPI_PROCESSOR_NOTIFY_POWER:
 519                 acpi_processor_cst_has_changed(pr);
 520                 acpi_bus_generate_proc_event(device, event, 0);
 521                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 522                                                   dev_name(&device->dev), event, 0);
 523                 break;
 524         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 525                 acpi_processor_tstate_has_changed(pr);
 526                 acpi_bus_generate_proc_event(device, event, 0);
 527                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 528                                                   dev_name(&device->dev), event, 0);
 529         default:
 530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 531                                   "Unsupported event [0x%x]\n", event));
 532                 break;
 533         }
 534
 535         return;
 536 }
 537
 538 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 539                 unsigned long action, void *hcpu)
 540 {
 541         unsigned int cpu = (unsigned long)hcpu;
 542         struct acpi_processor *pr = per_cpu(processors, cpu);
 543
 544         if (action == CPU_ONLINE && pr) {
 545                 acpi_processor_ppc_has_changed(pr, 0);
 546                 acpi_processor_cst_has_changed(pr);
 547                 acpi_processor_tstate_has_changed(pr);
 548         }
 549         return NOTIFY_OK;
 550 }
 551
 552 static struct notifier_block acpi_cpu_notifier =
 553 {
 554             .notifier_call = acpi_cpu_soft_notify,
 555 };
 556
 557 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 558 {
 559         struct acpi_processor *pr = NULL;
 560         int result = 0;
 561         struct sys_device *sysdev;
 562
 563         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 564         if (!pr)
 565                 return -ENOMEM;
 566
 567         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 568                 kfree(pr);
 569                 return -ENOMEM;
 570         }
 571
 572         pr->handle = device->handle;
 573         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 574         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 575         device->driver_data = pr;
 576
 577         result = acpi_processor_get_info(device);
 578         if (result) {
 579                 /* Processor is physically not present */
 580                 return 0;
 581         }
 582
 583         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 584
 585         /*
 586          * Buggy BIOS check
 587          * ACPI id of processors can be reported wrongly by the BIOS.
 588          * Don't trust it blindly
 589          */
 590         if (per_cpu(processor_device_array, pr->id) != NULL &&
 591             per_cpu(processor_device_array, pr->id) != device) {
 592                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 593                         "for the processor\n");
 594                 result = -ENODEV;
 595                 goto err_free_cpumask;
 596         }
 597         per_cpu(processor_device_array, pr->id) = device;
 598
 599         per_cpu(processors, pr->id) = pr;
 600
 601         result = acpi_processor_add_fs(device);
 602         if (result)
 603                 goto err_free_cpumask;
 604
 605         sysdev = get_cpu_sysdev(pr->id);
 606         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 607                 result = -EFAULT;
 608                 goto err_remove_fs;
 609         }
 610
 611 #ifdef CONFIG_CPU_FREQ
 612         acpi_processor_ppc_has_changed(pr, 0);
 613 #endif
 614         acpi_processor_get_throttling_info(pr);
 615         acpi_processor_get_limit_info(pr);
 616
 617
 618         acpi_processor_power_init(pr, device);
 619
 620         pr->cdev = thermal_cooling_device_register("Processor", device,
 621                                                 &processor_cooling_ops);
 622         if (IS_ERR(pr->cdev)) {
 623                 result = PTR_ERR(pr->cdev);
 624                 goto err_power_exit;
 625         }
 626
 627         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 628                  pr->cdev->id);
 629
 630         result = sysfs_create_link(&device->dev.kobj,
 631                                    &pr->cdev->device.kobj,
 632                                    "thermal_cooling");
 633         if (result) {
 634                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 635                 goto err_thermal_unregister;
 636         }
 637         result = sysfs_create_link(&pr->cdev->device.kobj,
 638                                    &device->dev.kobj,
 639                                    "device");
 640         if (result) {
 641                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 642                 goto err_remove_sysfs;
 643         }
 644
 645         return 0;
 646
 647 err_remove_sysfs:
 648         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 649 err_thermal_unregister:
 650         thermal_cooling_device_unregister(pr->cdev);
 651 err_power_exit:
 652         acpi_processor_power_exit(pr, device);
 653 err_remove_fs:
 654         acpi_processor_remove_fs(device);
 655 err_free_cpumask:
 656         free_cpumask_var(pr->throttling.shared_cpu_map);
 657
 658         return result;
 659 }
 660
 661 static int acpi_processor_remove(struct acpi_device *device, int type)
 662 {
 663         struct acpi_processor *pr = NULL;
 664
 665
 666         if (!device || !acpi_driver_data(device))
 667                 return -EINVAL;
 668
 669         pr = acpi_driver_data(device);
 670
 671         if (pr->id >= nr_cpu_ids)
 672                 goto free;
 673
 674         if (type == ACPI_BUS_REMOVAL_EJECT) {
 675                 if (acpi_processor_handle_eject(pr))
 676                         return -EINVAL;
 677         }
 678
 679         acpi_processor_power_exit(pr, device);
 680
 681         sysfs_remove_link(&device->dev.kobj, "sysdev");
 682
 683         acpi_processor_remove_fs(device);
 684
 685         if (pr->cdev) {
 686                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 687                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 688                 thermal_cooling_device_unregister(pr->cdev);
 689                 pr->cdev = NULL;
 690         }
 691
 692         per_cpu(processors, pr->id) = NULL;
 693         per_cpu(processor_device_array, pr->id) = NULL;
 694
 695 free:
 696         free_cpumask_var(pr->throttling.shared_cpu_map);
 697         kfree(pr);
 698
 699         return 0;
 700 }
 701
 702 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 703 /****************************************************************************
 704  *      Acpi processor hotplug support                                      *
 705  ****************************************************************************/
 706
 707 static int is_processor_present(acpi_handle handle)
 708 {
 709         acpi_status status;
 710         unsigned long long sta = 0;
 711
 712
 713         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 714
 715         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 716                 return 1;
 717
 718         /*
 719          * _STA is mandatory for a processor that supports hot plug
 720          */
 721         if (status == AE_NOT_FOUND)
 722                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 723                                 "Processor does not support hot plug\n"));
 724         else
 725                 ACPI_EXCEPTION((AE_INFO, status,
 726                                 "Processor Device is not present"));
 727         return 0;
 728 }
 729
 730 static
 731 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 732 {
 733         acpi_handle phandle;
 734         struct acpi_device *pdev;
 735
 736
 737         if (acpi_get_parent(handle, &phandle)) {
 738                 return -ENODEV;
 739         }
 740
 741         if (acpi_bus_get_device(phandle, &pdev)) {
 742                 return -ENODEV;
 743         }
 744
 745         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 746                 return -ENODEV;
 747         }
 748
 749         return 0;
 750 }
 751
 752 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 753                                                 u32 event, void *data)
 754 {
 755         struct acpi_processor *pr;
 756         struct acpi_device *device = NULL;
 757         int result;
 758
 759
 760         switch (event) {
 761         case ACPI_NOTIFY_BUS_CHECK:
 762         case ACPI_NOTIFY_DEVICE_CHECK:
 763                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 764                 "Processor driver received %s event\n",
 765                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 766                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 767
 768                 if (!is_processor_present(handle))
 769                         break;
 770
 771                 if (acpi_bus_get_device(handle, &device)) {
 772                         result = acpi_processor_device_add(handle, &device);
 773                         if (result)
 774                                 printk(KERN_ERR PREFIX
 775                                             "Unable to add the device\n");
 776                         break;
 777                 }
 778                 break;
 779         case ACPI_NOTIFY_EJECT_REQUEST:
 780                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 781                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 782
 783                 if (acpi_bus_get_device(handle, &device)) {
 784                         printk(KERN_ERR PREFIX
 785                                     "Device don't exist, dropping EJECT\n");
 786                         break;
 787                 }
 788                 pr = acpi_driver_data(device);
 789                 if (!pr) {
 790                         printk(KERN_ERR PREFIX
 791                                     "Driver data is NULL, dropping EJECT\n");
 792                         return;
 793                 }
 794                 break;
 795         default:
 796                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 797                                   "Unsupported event [0x%x]\n", event));
 798                 break;
 799         }
 800
 801         return;
 802 }
 803
 804 static acpi_status
 805 processor_walk_namespace_cb(acpi_handle handle,
 806                             u32 lvl, void *context, void **rv)
 807 {
 808         acpi_status status;
 809         int *action = context;
 810         acpi_object_type type = 0;
 811
 812         status = acpi_get_type(handle, &type);
 813         if (ACPI_FAILURE(status))
 814                 return (AE_OK);
 815
 816         if (type != ACPI_TYPE_PROCESSOR)
 817                 return (AE_OK);
 818
 819         switch (*action) {
 820         case INSTALL_NOTIFY_HANDLER:
 821                 acpi_install_notify_handler(handle,
 822                                             ACPI_SYSTEM_NOTIFY,
 823                                             acpi_processor_hotplug_notify,
 824                                             NULL);
 825                 break;
 826         case UNINSTALL_NOTIFY_HANDLER:
 827                 acpi_remove_notify_handler(handle,
 828                                            ACPI_SYSTEM_NOTIFY,
 829                                            acpi_processor_hotplug_notify);
 830                 break;
 831         default:
 832                 break;
 833         }
 834
 835         return (AE_OK);
 836 }
 837
 838 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 839 {
 840
 841         if (!is_processor_present(handle)) {
 842                 return AE_ERROR;
 843         }
 844
 845         if (acpi_map_lsapic(handle, p_cpu))
 846                 return AE_ERROR;
 847
 848         if (arch_register_cpu(*p_cpu)) {
 849                 acpi_unmap_lsapic(*p_cpu);
 850                 return AE_ERROR;
 851         }
 852
 853         return AE_OK;
 854 }
 855
 856 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 857 {
 858         if (cpu_online(pr->id))
 859                 cpu_down(pr->id);
 860
 861         arch_unregister_cpu(pr->id);
 862         acpi_unmap_lsapic(pr->id);
 863         return (0);
 864 }
 865 #else
 866 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 867 {
 868         return AE_ERROR;
 869 }
 870 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 871 {
 872         return (-EINVAL);
 873 }
 874 #endif
 875
 876 static
 877 void acpi_processor_install_hotplug_notify(void)
 878 {
 879 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 880         int action = INSTALL_NOTIFY_HANDLER;
 881         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 882                             ACPI_ROOT_OBJECT,
 883                             ACPI_UINT32_MAX,
 884                             processor_walk_namespace_cb, NULL, &action, NULL);
 885 #endif
 886         register_hotcpu_notifier(&acpi_cpu_notifier);
 887 }
 888
 889 static
 890 void acpi_processor_uninstall_hotplug_notify(void)
 891 {
 892 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 893         int action = UNINSTALL_NOTIFY_HANDLER;
 894         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 895                             ACPI_ROOT_OBJECT,
 896                             ACPI_UINT32_MAX,
 897                             processor_walk_namespace_cb, NULL, &action, NULL);
 898 #endif
 899         unregister_hotcpu_notifier(&acpi_cpu_notifier);
 900 }
 901
 902 /*
 903  * We keep the driver loaded even when ACPI is not running.
 904  * This is needed for the powernow-k8 driver, that works even without
 905  * ACPI, but needs symbols from this driver
 906  */
 907
 908 static int __init acpi_processor_init(void)
 909 {
 910         int result = 0;
 911
 912         if (acpi_disabled)
 913                 return 0;
 914
 915         memset(&errata, 0, sizeof(errata));
 916
 917 #ifdef CONFIG_ACPI_PROCFS
 918         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 919         if (!acpi_processor_dir)
 920                 return -ENOMEM;
 921 #endif
 922         result = cpuidle_register_driver(&acpi_idle_driver);
 923         if (result < 0)
 924                 goto out_proc;
 925
 926         result = acpi_bus_register_driver(&acpi_processor_driver);
 927         if (result < 0)
 928                 goto out_cpuidle;
 929
 930         acpi_processor_install_hotplug_notify();
 931
 932         acpi_thermal_cpufreq_init();
 933
 934         acpi_processor_ppc_init();
 935
 936         acpi_processor_throttling_init();
 937
 938         return 0;
 939
 940 out_cpuidle:
 941         cpuidle_unregister_driver(&acpi_idle_driver);
 942
 943 out_proc:
 944 #ifdef CONFIG_ACPI_PROCFS
 945         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 946 #endif
 947
 948         return result;
 949 }
 950
 951 static void __exit acpi_processor_exit(void)
 952 {
 953         if (acpi_disabled)
 954                 return;
 955
 956         acpi_processor_ppc_exit();
 957
 958         acpi_thermal_cpufreq_exit();
 959
 960         acpi_processor_uninstall_hotplug_notify();
 961
 962         acpi_bus_unregister_driver(&acpi_processor_driver);
 963
 964         cpuidle_unregister_driver(&acpi_idle_driver);
 965
 966 #ifdef CONFIG_ACPI_PROCFS
 967         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 968 #endif
 969
 970         return;
 971 }
 972
 973 module_init(acpi_processor_init);
 974 module_exit(acpi_processor_exit);
 975
 976 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 977
 978 MODULE_ALIAS("processor");