drivers/acpi/processor_core.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
  48 #include <asm/io.h>
  49 #include <asm/system.h>
  50 #include <asm/cpu.h>
  51 #include <asm/delay.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54 #include <asm/smp.h>
  55 #include <asm/acpi.h>
  56
  57 #include <acpi/acpi_bus.h>
  58 #include <acpi/acpi_drivers.h>
  59 #include <acpi/processor.h>
  60
  61 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  62 #define ACPI_PROCESSOR_CLASS            "processor"
  63 #define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
  64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  65 #define ACPI_PROCESSOR_FILE_INFO        "info"
  66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  70
  71 #define ACPI_PROCESSOR_LIMIT_USER       0
  72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  73
  74 #define ACPI_STA_PRESENT 0x00000001
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("acpi_processor")
  78
  79     MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_start(struct acpi_device *device);
  85 static int acpi_processor_remove(struct acpi_device *device, int type);
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  89 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  90
  91 static struct acpi_driver acpi_processor_driver = {
  92         .name = ACPI_PROCESSOR_DRIVER_NAME,
  93         .class = ACPI_PROCESSOR_CLASS,
  94         .ids = ACPI_PROCESSOR_HID,
  95         .ops = {
  96                 .add = acpi_processor_add,
  97                 .remove = acpi_processor_remove,
  98                 .start = acpi_processor_start,
  99                 },
 100 };
 101
 102 #define INSTALL_NOTIFY_HANDLER          1
 103 #define UNINSTALL_NOTIFY_HANDLER        2
 104
 105 static struct file_operations acpi_processor_info_fops = {
 106         .open = acpi_processor_info_open_fs,
 107         .read = seq_read,
 108         .llseek = seq_lseek,
 109         .release = single_release,
 110 };
 111
 112 struct acpi_processor *processors[NR_CPUS];
 113 struct acpi_processor_errata errata __read_mostly;
 114
 115 /* --------------------------------------------------------------------------
 116                                 Errata Handling
 117    -------------------------------------------------------------------------- */
 118
 119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 120 {
 121         u8 rev = 0;
 122         u8 value1 = 0;
 123         u8 value2 = 0;
 124
 125         ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
 126
 127         if (!dev)
 128                 return_VALUE(-EINVAL);
 129
 130         /*
 131          * Note that 'dev' references the PIIX4 ACPI Controller.
 132          */
 133
 134         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 135
 136         switch (rev) {
 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 (rev) {
 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_VALUE(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         ACPI_FUNCTION_TRACE("acpi_processor_errata");
 230
 231         if (!pr)
 232                 return_VALUE(-EINVAL);
 233
 234         /*
 235          * PIIX4
 236          */
 237         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 238                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 239                              PCI_ANY_ID, NULL);
 240         if (dev) {
 241                 result = acpi_processor_errata_piix4(dev);
 242                 pci_dev_put(dev);
 243         }
 244
 245         return_VALUE(result);
 246 }
 247
 248 /* --------------------------------------------------------------------------
 249                               Common ACPI processor functions
 250    -------------------------------------------------------------------------- */
 251
 252 /*
 253  * _PDC is required for a BIOS-OS handshake for most of the newer
 254  * ACPI processor features.
 255  */
 256 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 257 {
 258         struct acpi_object_list *pdc_in = pr->pdc;
 259         acpi_status status = AE_OK;
 260
 261         ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
 262
 263         if (!pdc_in)
 264                 return_VALUE(status);
 265
 266         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 267
 268         if (ACPI_FAILURE(status))
 269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 270                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 271
 272         return_VALUE(status);
 273 }
 274
 275 /* --------------------------------------------------------------------------
 276                               FS Interface (/proc)
 277    -------------------------------------------------------------------------- */
 278
 279 static struct proc_dir_entry *acpi_processor_dir = NULL;
 280
 281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 282 {
 283         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
 284
 285         ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
 286
 287         if (!pr)
 288                 goto end;
 289
 290         seq_printf(seq, "processor id:            %d\n"
 291                    "acpi id:                 %d\n"
 292                    "bus mastering control:   %s\n"
 293                    "power management:        %s\n"
 294                    "throttling control:      %s\n"
 295                    "limit interface:         %s\n",
 296                    pr->id,
 297                    pr->acpi_id,
 298                    pr->flags.bm_control ? "yes" : "no",
 299                    pr->flags.power ? "yes" : "no",
 300                    pr->flags.throttling ? "yes" : "no",
 301                    pr->flags.limit ? "yes" : "no");
 302
 303       end:
 304         return_VALUE(0);
 305 }
 306
 307 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 308 {
 309         return single_open(file, acpi_processor_info_seq_show,
 310                            PDE(inode)->data);
 311 }
 312
 313 static int acpi_processor_add_fs(struct acpi_device *device)
 314 {
 315         struct proc_dir_entry *entry = NULL;
 316
 317         ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
 318
 319         if (!acpi_device_dir(device)) {
 320                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 321                                                      acpi_processor_dir);
 322                 if (!acpi_device_dir(device))
 323                         return_VALUE(-ENODEV);
 324         }
 325         acpi_device_dir(device)->owner = THIS_MODULE;
 326
 327         /* 'info' [R] */
 328         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 329                                   S_IRUGO, acpi_device_dir(device));
 330         if (!entry)
 331                 return_VALUE(-EIO);
 332         else {
 333                 entry->proc_fops = &acpi_processor_info_fops;
 334                 entry->data = acpi_driver_data(device);
 335                 entry->owner = THIS_MODULE;
 336         }
 337
 338         /* 'throttling' [R/W] */
 339         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 340                                   S_IFREG | S_IRUGO | S_IWUSR,
 341                                   acpi_device_dir(device));
 342         if (!entry)
 343                 return_VALUE(-EIO);
 344         else {
 345                 entry->proc_fops = &acpi_processor_throttling_fops;
 346                 entry->data = acpi_driver_data(device);
 347                 entry->owner = THIS_MODULE;
 348         }
 349
 350         /* 'limit' [R/W] */
 351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 352                                   S_IFREG | S_IRUGO | S_IWUSR,
 353                                   acpi_device_dir(device));
 354         if (!entry)
 355                 return_VALUE( -EIO);
 356         else {
 357                 entry->proc_fops = &acpi_processor_limit_fops;
 358                 entry->data = acpi_driver_data(device);
 359                 entry->owner = THIS_MODULE;
 360         }
 361
 362         return_VALUE(0);
 363 }
 364
 365 static int acpi_processor_remove_fs(struct acpi_device *device)
 366 {
 367         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
 368
 369         if (acpi_device_dir(device)) {
 370                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 371                                   acpi_device_dir(device));
 372                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 373                                   acpi_device_dir(device));
 374                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 375                                   acpi_device_dir(device));
 376                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 377                 acpi_device_dir(device) = NULL;
 378         }
 379
 380         return_VALUE(0);
 381 }
 382
 383 /* Use the acpiid in MADT to map cpus in case of SMP */
 384 #ifndef CONFIG_SMP
 385 #define convert_acpiid_to_cpu(acpi_id) (-1)
 386 #else
 387
 388 #ifdef CONFIG_IA64
 389 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
 390 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 391 #define ARCH_BAD_APICID         (0xffff)
 392 #else
 393 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
 394 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 395 #define ARCH_BAD_APICID         (0xff)
 396 #endif
 397
 398 static int convert_acpiid_to_cpu(u8 acpi_id)
 399 {
 400         u16 apic_id;
 401         int i;
 402
 403         apic_id = arch_acpiid_to_apicid[acpi_id];
 404         if (apic_id == ARCH_BAD_APICID)
 405                 return -1;
 406
 407         for (i = 0; i < NR_CPUS; i++) {
 408                 if (arch_cpu_to_apicid[i] == apic_id)
 409                         return i;
 410         }
 411         return -1;
 412 }
 413 #endif
 414
 415 /* --------------------------------------------------------------------------
 416                                  Driver Interface
 417    -------------------------------------------------------------------------- */
 418
 419 static int acpi_processor_get_info(struct acpi_processor *pr)
 420 {
 421         acpi_status status = 0;
 422         union acpi_object object = { 0 };
 423         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 424         int cpu_index;
 425         static int cpu0_initialized;
 426
 427         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
 428
 429         if (!pr)
 430                 return_VALUE(-EINVAL);
 431
 432         if (num_online_cpus() > 1)
 433                 errata.smp = TRUE;
 434
 435         acpi_processor_errata(pr);
 436
 437         /*
 438          * Check to see if we have bus mastering arbitration control.  This
 439          * is required for proper C3 usage (to maintain cache coherency).
 440          */
 441         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
 442                 pr->flags.bm_control = 1;
 443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 444                                   "Bus mastering arbitration control present\n"));
 445         } else
 446                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 447                                   "No bus mastering arbitration control\n"));
 448
 449         /*
 450          * Evalute the processor object.  Note that it is common on SMP to
 451          * have the first (boot) processor with a valid PBLK address while
 452          * all others have a NULL address.
 453          */
 454         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 455         if (ACPI_FAILURE(status)) {
 456                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
 457                 return_VALUE(-ENODEV);
 458         }
 459
 460         /*
 461          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 462          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 463          */
 464         pr->acpi_id = object.processor.proc_id;
 465
 466         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
 467
 468         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 469         if (!cpu0_initialized && (cpu_index == -1) &&
 470             (num_online_cpus() == 1)) {
 471                 cpu_index = 0;
 472         }
 473
 474         cpu0_initialized = 1;
 475
 476         pr->id = cpu_index;
 477
 478         /*
 479          *  Extra Processor objects may be enumerated on MP systems with
 480          *  less than the max # of CPUs. They should be ignored _iff
 481          *  they are physically not present.
 482          */
 483         if (cpu_index == -1) {
 484                 if (ACPI_FAILURE
 485                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 486                         printk(KERN_ERR PREFIX
 487                                     "Getting cpuindex for acpiid 0x%x\n",
 488                                     pr->acpi_id);
 489                         return_VALUE(-ENODEV);
 490                 }
 491         }
 492
 493         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 494                           pr->acpi_id));
 495
 496         if (!object.processor.pblk_address)
 497                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 498         else if (object.processor.pblk_length != 6)
 499                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 500                             object.processor.pblk_length);
 501         else {
 502                 pr->throttling.address = object.processor.pblk_address;
 503                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
 504                 pr->throttling.duty_width = acpi_fadt.duty_width;
 505
 506                 pr->pblk = object.processor.pblk_address;
 507
 508                 /*
 509                  * We don't care about error returns - we just try to mark
 510                  * these reserved so that nobody else is confused into thinking
 511                  * that this region might be unused..
 512                  *
 513                  * (In particular, allocating the IO range for Cardbus)
 514                  */
 515                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 516         }
 517
 518 #ifdef CONFIG_CPU_FREQ
 519         acpi_processor_ppc_has_changed(pr);
 520 #endif
 521         acpi_processor_get_throttling_info(pr);
 522         acpi_processor_get_limit_info(pr);
 523
 524         return_VALUE(0);
 525 }
 526
 527 static void *processor_device_array[NR_CPUS];
 528
 529 static int acpi_processor_start(struct acpi_device *device)
 530 {
 531         int result = 0;
 532         acpi_status status = AE_OK;
 533         struct acpi_processor *pr;
 534
 535         ACPI_FUNCTION_TRACE("acpi_processor_start");
 536
 537         pr = acpi_driver_data(device);
 538
 539         result = acpi_processor_get_info(pr);
 540         if (result) {
 541                 /* Processor is physically not present */
 542                 return_VALUE(0);
 543         }
 544
 545         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 546
 547         /*
 548          * Buggy BIOS check
 549          * ACPI id of processors can be reported wrongly by the BIOS.
 550          * Don't trust it blindly
 551          */
 552         if (processor_device_array[pr->id] != NULL &&
 553             processor_device_array[pr->id] != (void *)device) {
 554                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 555                         "for the processor\n");
 556                 return_VALUE(-ENODEV);
 557         }
 558         processor_device_array[pr->id] = (void *)device;
 559
 560         processors[pr->id] = pr;
 561
 562         result = acpi_processor_add_fs(device);
 563         if (result)
 564                 goto end;
 565
 566         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 567                                              acpi_processor_notify, pr);
 568
 569         /* _PDC call should be done before doing anything else (if reqd.). */
 570         arch_acpi_processor_init_pdc(pr);
 571         acpi_processor_set_pdc(pr);
 572
 573         acpi_processor_power_init(pr, device);
 574
 575         if (pr->flags.throttling) {
 576                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 577                        acpi_device_name(device), acpi_device_bid(device));
 578                 printk(" %d throttling states", pr->throttling.state_count);
 579                 printk(")\n");
 580         }
 581
 582       end:
 583
 584         return_VALUE(result);
 585 }
 586
 587 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 588 {
 589         struct acpi_processor *pr = (struct acpi_processor *)data;
 590         struct acpi_device *device = NULL;
 591
 592         ACPI_FUNCTION_TRACE("acpi_processor_notify");
 593
 594         if (!pr)
 595                 return_VOID;
 596
 597         if (acpi_bus_get_device(pr->handle, &device))
 598                 return_VOID;
 599
 600         switch (event) {
 601         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 602                 acpi_processor_ppc_has_changed(pr);
 603                 acpi_bus_generate_event(device, event,
 604                                         pr->performance_platform_limit);
 605                 break;
 606         case ACPI_PROCESSOR_NOTIFY_POWER:
 607                 acpi_processor_cst_has_changed(pr);
 608                 acpi_bus_generate_event(device, event, 0);
 609                 break;
 610         default:
 611                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 612                                   "Unsupported event [0x%x]\n", event));
 613                 break;
 614         }
 615
 616         return_VOID;
 617 }
 618
 619 static int acpi_processor_add(struct acpi_device *device)
 620 {
 621         struct acpi_processor *pr = NULL;
 622
 623         ACPI_FUNCTION_TRACE("acpi_processor_add");
 624
 625         if (!device)
 626                 return_VALUE(-EINVAL);
 627
 628         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 629         if (!pr)
 630                 return_VALUE(-ENOMEM);
 631         memset(pr, 0, sizeof(struct acpi_processor));
 632
 633         pr->handle = device->handle;
 634         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 635         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 636         acpi_driver_data(device) = pr;
 637
 638         return_VALUE(0);
 639 }
 640
 641 static int acpi_processor_remove(struct acpi_device *device, int type)
 642 {
 643         acpi_status status = AE_OK;
 644         struct acpi_processor *pr = NULL;
 645
 646         ACPI_FUNCTION_TRACE("acpi_processor_remove");
 647
 648         if (!device || !acpi_driver_data(device))
 649                 return_VALUE(-EINVAL);
 650
 651         pr = (struct acpi_processor *)acpi_driver_data(device);
 652
 653         if (pr->id >= NR_CPUS) {
 654                 kfree(pr);
 655                 return_VALUE(0);
 656         }
 657
 658         if (type == ACPI_BUS_REMOVAL_EJECT) {
 659                 if (acpi_processor_handle_eject(pr))
 660                         return_VALUE(-EINVAL);
 661         }
 662
 663         acpi_processor_power_exit(pr, device);
 664
 665         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 666                                             acpi_processor_notify);
 667
 668         acpi_processor_remove_fs(device);
 669
 670         processors[pr->id] = NULL;
 671
 672         kfree(pr);
 673
 674         return_VALUE(0);
 675 }
 676
 677 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 678 /****************************************************************************
 679  *      Acpi processor hotplug support                                      *
 680  ****************************************************************************/
 681
 682 static int is_processor_present(acpi_handle handle);
 683
 684 static int is_processor_present(acpi_handle handle)
 685 {
 686         acpi_status status;
 687         unsigned long sta = 0;
 688
 689         ACPI_FUNCTION_TRACE("is_processor_present");
 690
 691         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 692         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 693                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 694                 return_VALUE(0);
 695         }
 696         return_VALUE(1);
 697 }
 698
 699 static
 700 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 701 {
 702         acpi_handle phandle;
 703         struct acpi_device *pdev;
 704         struct acpi_processor *pr;
 705
 706         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
 707
 708         if (acpi_get_parent(handle, &phandle)) {
 709                 return_VALUE(-ENODEV);
 710         }
 711
 712         if (acpi_bus_get_device(phandle, &pdev)) {
 713                 return_VALUE(-ENODEV);
 714         }
 715
 716         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 717                 return_VALUE(-ENODEV);
 718         }
 719
 720         acpi_bus_start(*device);
 721
 722         pr = acpi_driver_data(*device);
 723         if (!pr)
 724                 return_VALUE(-ENODEV);
 725
 726         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 727                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
 728         }
 729         return_VALUE(0);
 730 }
 731
 732 static void
 733 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 734 {
 735         struct acpi_processor *pr;
 736         struct acpi_device *device = NULL;
 737         int result;
 738
 739         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
 740
 741         switch (event) {
 742         case ACPI_NOTIFY_BUS_CHECK:
 743         case ACPI_NOTIFY_DEVICE_CHECK:
 744                 printk("Processor driver received %s event\n",
 745                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 746                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 747
 748                 if (!is_processor_present(handle))
 749                         break;
 750
 751                 if (acpi_bus_get_device(handle, &device)) {
 752                         result = acpi_processor_device_add(handle, &device);
 753                         if (result)
 754                                 printk(KERN_ERR PREFIX
 755                                             "Unable to add the device\n");
 756                         break;
 757                 }
 758
 759                 pr = acpi_driver_data(device);
 760                 if (!pr) {
 761                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 762                         break;
 763                 }
 764
 765                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 766                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 767                         break;
 768                 }
 769
 770                 result = acpi_processor_start(device);
 771                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 772                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
 773                 } else {
 774                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 775                                     acpi_device_bid(device));
 776                 }
 777                 break;
 778         case ACPI_NOTIFY_EJECT_REQUEST:
 779                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 780                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 781
 782                 if (acpi_bus_get_device(handle, &device)) {
 783                         printk(KERN_ERR PREFIX
 784                                     "Device don't exist, dropping EJECT\n");
 785                         break;
 786                 }
 787                 pr = acpi_driver_data(device);
 788                 if (!pr) {
 789                         printk(KERN_ERR PREFIX
 790                                     "Driver data is NULL, dropping EJECT\n");
 791                         return_VOID;
 792                 }
 793
 794                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 795                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 796                 break;
 797         default:
 798                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 799                                   "Unsupported event [0x%x]\n", event));
 800                 break;
 801         }
 802
 803         return_VOID;
 804 }
 805
 806 static acpi_status
 807 processor_walk_namespace_cb(acpi_handle handle,
 808                             u32 lvl, void *context, void **rv)
 809 {
 810         acpi_status status;
 811         int *action = context;
 812         acpi_object_type type = 0;
 813
 814         status = acpi_get_type(handle, &type);
 815         if (ACPI_FAILURE(status))
 816                 return (AE_OK);
 817
 818         if (type != ACPI_TYPE_PROCESSOR)
 819                 return (AE_OK);
 820
 821         switch (*action) {
 822         case INSTALL_NOTIFY_HANDLER:
 823                 acpi_install_notify_handler(handle,
 824                                             ACPI_SYSTEM_NOTIFY,
 825                                             acpi_processor_hotplug_notify,
 826                                             NULL);
 827                 break;
 828         case UNINSTALL_NOTIFY_HANDLER:
 829                 acpi_remove_notify_handler(handle,
 830                                            ACPI_SYSTEM_NOTIFY,
 831                                            acpi_processor_hotplug_notify);
 832                 break;
 833         default:
 834                 break;
 835         }
 836
 837         return (AE_OK);
 838 }
 839
 840 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 841 {
 842         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
 843
 844         if (!is_processor_present(handle)) {
 845                 return_VALUE(AE_ERROR);
 846         }
 847
 848         if (acpi_map_lsapic(handle, p_cpu))
 849                 return_VALUE(AE_ERROR);
 850
 851         if (arch_register_cpu(*p_cpu)) {
 852                 acpi_unmap_lsapic(*p_cpu);
 853                 return_VALUE(AE_ERROR);
 854         }
 855
 856         return_VALUE(AE_OK);
 857 }
 858
 859 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 860 {
 861         if (cpu_online(pr->id)) {
 862                 return (-EINVAL);
 863         }
 864         arch_unregister_cpu(pr->id);
 865         acpi_unmap_lsapic(pr->id);
 866         return (0);
 867 }
 868 #else
 869 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 870 {
 871         return AE_ERROR;
 872 }
 873 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 874 {
 875         return (-EINVAL);
 876 }
 877 #endif
 878
 879 static
 880 void acpi_processor_install_hotplug_notify(void)
 881 {
 882 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 883         int action = INSTALL_NOTIFY_HANDLER;
 884         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 885                             ACPI_ROOT_OBJECT,
 886                             ACPI_UINT32_MAX,
 887                             processor_walk_namespace_cb, &action, NULL);
 888 #endif
 889 }
 890
 891 static
 892 void acpi_processor_uninstall_hotplug_notify(void)
 893 {
 894 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 895         int action = UNINSTALL_NOTIFY_HANDLER;
 896         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 897                             ACPI_ROOT_OBJECT,
 898                             ACPI_UINT32_MAX,
 899                             processor_walk_namespace_cb, &action, NULL);
 900 #endif
 901 }
 902
 903 /*
 904  * We keep the driver loaded even when ACPI is not running.
 905  * This is needed for the powernow-k8 driver, that works even without
 906  * ACPI, but needs symbols from this driver
 907  */
 908
 909 static int __init acpi_processor_init(void)
 910 {
 911         int result = 0;
 912
 913         ACPI_FUNCTION_TRACE("acpi_processor_init");
 914
 915         memset(&processors, 0, sizeof(processors));
 916         memset(&errata, 0, sizeof(errata));
 917
 918         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 919         if (!acpi_processor_dir)
 920                 return_VALUE(0);
 921         acpi_processor_dir->owner = THIS_MODULE;
 922
 923         result = acpi_bus_register_driver(&acpi_processor_driver);
 924         if (result < 0) {
 925                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 926                 return_VALUE(0);
 927         }
 928
 929         acpi_processor_install_hotplug_notify();
 930
 931         acpi_thermal_cpufreq_init();
 932
 933         acpi_processor_ppc_init();
 934
 935         return_VALUE(0);
 936 }
 937
 938 static void __exit acpi_processor_exit(void)
 939 {
 940         ACPI_FUNCTION_TRACE("acpi_processor_exit");
 941
 942         acpi_processor_ppc_exit();
 943
 944         acpi_thermal_cpufreq_exit();
 945
 946         acpi_processor_uninstall_hotplug_notify();
 947
 948         acpi_bus_unregister_driver(&acpi_processor_driver);
 949
 950         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 951
 952         return_VOID;
 953 }
 954
 955 module_init(acpi_processor_init);
 956 module_exit(acpi_processor_exit);
 957
 958 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 959
 960 MODULE_ALIAS("processor");