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;
 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 fucntions
 250    -------------------------------------------------------------------------- */
 251
 252 /*
 253  * _PDC is required for a BIOS-OS handshake for most of the newer
 254  * ACPI processor features.
 255  */
 256
 257 int acpi_processor_set_pdc(struct acpi_processor *pr,
 258                            struct acpi_object_list *pdc_in)
 259 {
 260         acpi_status status = AE_OK;
 261         u32 arg0_buf[3];
 262         union acpi_object arg0 = { ACPI_TYPE_BUFFER };
 263         struct acpi_object_list no_object = { 1, &arg0 };
 264         struct acpi_object_list *pdc;
 265
 266         ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
 267
 268         arg0.buffer.length = 12;
 269         arg0.buffer.pointer = (u8 *) arg0_buf;
 270         arg0_buf[0] = ACPI_PDC_REVISION_ID;
 271         arg0_buf[1] = 0;
 272         arg0_buf[2] = 0;
 273
 274         pdc = (pdc_in) ? pdc_in : &no_object;
 275
 276         status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
 277
 278         if ((ACPI_FAILURE(status)) && (pdc_in))
 279                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 280                                   "Error evaluating _PDC, using legacy perf. control...\n"));
 281
 282         return_VALUE(status);
 283 }
 284
 285 /* --------------------------------------------------------------------------
 286                               FS Interface (/proc)
 287    -------------------------------------------------------------------------- */
 288
 289 static struct proc_dir_entry *acpi_processor_dir = NULL;
 290
 291 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 292 {
 293         struct acpi_processor *pr = (struct acpi_processor *)seq->private;
 294
 295         ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
 296
 297         if (!pr)
 298                 goto end;
 299
 300         seq_printf(seq, "processor id:            %d\n"
 301                    "acpi id:                 %d\n"
 302                    "bus mastering control:   %s\n"
 303                    "power management:        %s\n"
 304                    "throttling control:      %s\n"
 305                    "limit interface:         %s\n",
 306                    pr->id,
 307                    pr->acpi_id,
 308                    pr->flags.bm_control ? "yes" : "no",
 309                    pr->flags.power ? "yes" : "no",
 310                    pr->flags.throttling ? "yes" : "no",
 311                    pr->flags.limit ? "yes" : "no");
 312
 313       end:
 314         return_VALUE(0);
 315 }
 316
 317 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 318 {
 319         return single_open(file, acpi_processor_info_seq_show,
 320                            PDE(inode)->data);
 321 }
 322
 323 static int acpi_processor_add_fs(struct acpi_device *device)
 324 {
 325         struct proc_dir_entry *entry = NULL;
 326
 327         ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
 328
 329         if (!acpi_device_dir(device)) {
 330                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 331                                                      acpi_processor_dir);
 332                 if (!acpi_device_dir(device))
 333                         return_VALUE(-ENODEV);
 334         }
 335         acpi_device_dir(device)->owner = THIS_MODULE;
 336
 337         /* 'info' [R] */
 338         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 339                                   S_IRUGO, acpi_device_dir(device));
 340         if (!entry)
 341                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 342                                   "Unable to create '%s' fs entry\n",
 343                                   ACPI_PROCESSOR_FILE_INFO));
 344         else {
 345                 entry->proc_fops = &acpi_processor_info_fops;
 346                 entry->data = acpi_driver_data(device);
 347                 entry->owner = THIS_MODULE;
 348         }
 349
 350         /* 'throttling' [R/W] */
 351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 352                                   S_IFREG | S_IRUGO | S_IWUSR,
 353                                   acpi_device_dir(device));
 354         if (!entry)
 355                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 356                                   "Unable to create '%s' fs entry\n",
 357                                   ACPI_PROCESSOR_FILE_THROTTLING));
 358         else {
 359                 entry->proc_fops = &acpi_processor_throttling_fops;
 360                 entry->proc_fops->write = acpi_processor_write_throttling;
 361                 entry->data = acpi_driver_data(device);
 362                 entry->owner = THIS_MODULE;
 363         }
 364
 365         /* 'limit' [R/W] */
 366         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 367                                   S_IFREG | S_IRUGO | S_IWUSR,
 368                                   acpi_device_dir(device));
 369         if (!entry)
 370                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 371                                   "Unable to create '%s' fs entry\n",
 372                                   ACPI_PROCESSOR_FILE_LIMIT));
 373         else {
 374                 entry->proc_fops = &acpi_processor_limit_fops;
 375                 entry->proc_fops->write = acpi_processor_write_limit;
 376                 entry->data = acpi_driver_data(device);
 377                 entry->owner = THIS_MODULE;
 378         }
 379
 380         return_VALUE(0);
 381 }
 382
 383 static int acpi_processor_remove_fs(struct acpi_device *device)
 384 {
 385         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
 386
 387         if (acpi_device_dir(device)) {
 388                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 389                                   acpi_device_dir(device));
 390                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 391                                   acpi_device_dir(device));
 392                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 393                                   acpi_device_dir(device));
 394                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 395                 acpi_device_dir(device) = NULL;
 396         }
 397
 398         return_VALUE(0);
 399 }
 400
 401 /* Use the acpiid in MADT to map cpus in case of SMP */
 402 #ifndef CONFIG_SMP
 403 #define convert_acpiid_to_cpu(acpi_id) (0xff)
 404 #else
 405
 406 #ifdef CONFIG_IA64
 407 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
 408 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 409 #define ARCH_BAD_APICID         (0xffff)
 410 #else
 411 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
 412 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 413 #define ARCH_BAD_APICID         (0xff)
 414 #endif
 415
 416 static u8 convert_acpiid_to_cpu(u8 acpi_id)
 417 {
 418         u16 apic_id;
 419         int i;
 420
 421         apic_id = arch_acpiid_to_apicid[acpi_id];
 422         if (apic_id == ARCH_BAD_APICID)
 423                 return -1;
 424
 425         for (i = 0; i < NR_CPUS; i++) {
 426                 if (arch_cpu_to_apicid[i] == apic_id)
 427                         return i;
 428         }
 429         return -1;
 430 }
 431 #endif
 432
 433 /* --------------------------------------------------------------------------
 434                                  Driver Interface
 435    -------------------------------------------------------------------------- */
 436
 437 static int acpi_processor_get_info(struct acpi_processor *pr)
 438 {
 439         acpi_status status = 0;
 440         union acpi_object object = { 0 };
 441         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 442         u8 cpu_index;
 443         static int cpu0_initialized;
 444
 445         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
 446
 447         if (!pr)
 448                 return_VALUE(-EINVAL);
 449
 450         if (num_online_cpus() > 1)
 451                 errata.smp = TRUE;
 452
 453         acpi_processor_errata(pr);
 454
 455         /*
 456          * Check to see if we have bus mastering arbitration control.  This
 457          * is required for proper C3 usage (to maintain cache coherency).
 458          */
 459         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
 460                 pr->flags.bm_control = 1;
 461                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 462                                   "Bus mastering arbitration control present\n"));
 463         } else
 464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 465                                   "No bus mastering arbitration control\n"));
 466
 467         /*
 468          * Evalute the processor object.  Note that it is common on SMP to
 469          * have the first (boot) processor with a valid PBLK address while
 470          * all others have a NULL address.
 471          */
 472         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 473         if (ACPI_FAILURE(status)) {
 474                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 475                                   "Error evaluating processor object\n"));
 476                 return_VALUE(-ENODEV);
 477         }
 478
 479         /*
 480          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 481          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 482          */
 483         pr->acpi_id = object.processor.proc_id;
 484
 485         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
 486
 487         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 488         if (!cpu0_initialized && (cpu_index == 0xff) &&
 489             (num_online_cpus() == 1)) {
 490                 cpu_index = 0;
 491         }
 492
 493         cpu0_initialized = 1;
 494
 495         pr->id = cpu_index;
 496
 497         /*
 498          *  Extra Processor objects may be enumerated on MP systems with
 499          *  less than the max # of CPUs. They should be ignored _iff
 500          *  they are physically not present.
 501          */
 502         if (cpu_index >= NR_CPUS) {
 503                 if (ACPI_FAILURE
 504                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 505                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 506                                           "Error getting cpuindex for acpiid 0x%x\n",
 507                                           pr->acpi_id));
 508                         return_VALUE(-ENODEV);
 509                 }
 510         }
 511
 512         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 513                           pr->acpi_id));
 514
 515         if (!object.processor.pblk_address)
 516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 517         else if (object.processor.pblk_length != 6)
 518                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
 519                                   object.processor.pblk_length));
 520         else {
 521                 pr->throttling.address = object.processor.pblk_address;
 522                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
 523                 pr->throttling.duty_width = acpi_fadt.duty_width;
 524
 525                 pr->pblk = object.processor.pblk_address;
 526
 527                 /*
 528                  * We don't care about error returns - we just try to mark
 529                  * these reserved so that nobody else is confused into thinking
 530                  * that this region might be unused..
 531                  *
 532                  * (In particular, allocating the IO range for Cardbus)
 533                  */
 534                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 535         }
 536
 537 #ifdef CONFIG_CPU_FREQ
 538         acpi_processor_ppc_has_changed(pr);
 539 #endif
 540         acpi_processor_get_throttling_info(pr);
 541         acpi_processor_get_limit_info(pr);
 542
 543         return_VALUE(0);
 544 }
 545
 546 static int acpi_processor_start(struct acpi_device *device)
 547 {
 548         int result = 0;
 549         acpi_status status = AE_OK;
 550         struct acpi_processor *pr;
 551
 552         ACPI_FUNCTION_TRACE("acpi_processor_start");
 553
 554         pr = acpi_driver_data(device);
 555
 556         result = acpi_processor_get_info(pr);
 557         if (result) {
 558                 /* Processor is physically not present */
 559                 return_VALUE(0);
 560         }
 561
 562         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 563
 564         processors[pr->id] = pr;
 565
 566         result = acpi_processor_add_fs(device);
 567         if (result)
 568                 goto end;
 569
 570         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 571                                              acpi_processor_notify, pr);
 572         if (ACPI_FAILURE(status)) {
 573                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 574                                   "Error installing device notify handler\n"));
 575         }
 576
 577         acpi_processor_power_init(pr, device);
 578
 579         if (pr->flags.throttling) {
 580                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 581                        acpi_device_name(device), acpi_device_bid(device));
 582                 printk(" %d throttling states", pr->throttling.state_count);
 583                 printk(")\n");
 584         }
 585
 586       end:
 587
 588         return_VALUE(result);
 589 }
 590
 591 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 592 {
 593         struct acpi_processor *pr = (struct acpi_processor *)data;
 594         struct acpi_device *device = NULL;
 595
 596         ACPI_FUNCTION_TRACE("acpi_processor_notify");
 597
 598         if (!pr)
 599                 return_VOID;
 600
 601         if (acpi_bus_get_device(pr->handle, &device))
 602                 return_VOID;
 603
 604         switch (event) {
 605         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 606                 acpi_processor_ppc_has_changed(pr);
 607                 acpi_bus_generate_event(device, event,
 608                                         pr->performance_platform_limit);
 609                 break;
 610         case ACPI_PROCESSOR_NOTIFY_POWER:
 611                 acpi_processor_cst_has_changed(pr);
 612                 acpi_bus_generate_event(device, event, 0);
 613                 break;
 614         default:
 615                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 616                                   "Unsupported event [0x%x]\n", event));
 617                 break;
 618         }
 619
 620         return_VOID;
 621 }
 622
 623 static int acpi_processor_add(struct acpi_device *device)
 624 {
 625         struct acpi_processor *pr = NULL;
 626
 627         ACPI_FUNCTION_TRACE("acpi_processor_add");
 628
 629         if (!device)
 630                 return_VALUE(-EINVAL);
 631
 632         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 633         if (!pr)
 634                 return_VALUE(-ENOMEM);
 635         memset(pr, 0, sizeof(struct acpi_processor));
 636
 637         pr->handle = device->handle;
 638         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 639         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 640         acpi_driver_data(device) = pr;
 641
 642         return_VALUE(0);
 643 }
 644
 645 static int acpi_processor_remove(struct acpi_device *device, int type)
 646 {
 647         acpi_status status = AE_OK;
 648         struct acpi_processor *pr = NULL;
 649
 650         ACPI_FUNCTION_TRACE("acpi_processor_remove");
 651
 652         if (!device || !acpi_driver_data(device))
 653                 return_VALUE(-EINVAL);
 654
 655         pr = (struct acpi_processor *)acpi_driver_data(device);
 656
 657         if (pr->id >= NR_CPUS) {
 658                 kfree(pr);
 659                 return_VALUE(0);
 660         }
 661
 662         if (type == ACPI_BUS_REMOVAL_EJECT) {
 663                 if (acpi_processor_handle_eject(pr))
 664                         return_VALUE(-EINVAL);
 665         }
 666
 667         acpi_processor_power_exit(pr, device);
 668
 669         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 670                                             acpi_processor_notify);
 671         if (ACPI_FAILURE(status)) {
 672                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 673                                   "Error removing notify handler\n"));
 674         }
 675
 676         acpi_processor_remove_fs(device);
 677
 678         processors[pr->id] = NULL;
 679
 680         kfree(pr);
 681
 682         return_VALUE(0);
 683 }
 684
 685 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 686 /****************************************************************************
 687  *      Acpi processor hotplug support                                      *
 688  ****************************************************************************/
 689
 690 static int is_processor_present(acpi_handle handle);
 691
 692 static int is_processor_present(acpi_handle handle)
 693 {
 694         acpi_status status;
 695         unsigned long sta = 0;
 696
 697         ACPI_FUNCTION_TRACE("is_processor_present");
 698
 699         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 700         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 701                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 702                                   "Processor Device is not present\n"));
 703                 return_VALUE(0);
 704         }
 705         return_VALUE(1);
 706 }
 707
 708 static
 709 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 710 {
 711         acpi_handle phandle;
 712         struct acpi_device *pdev;
 713         struct acpi_processor *pr;
 714
 715         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
 716
 717         if (acpi_get_parent(handle, &phandle)) {
 718                 return_VALUE(-ENODEV);
 719         }
 720
 721         if (acpi_bus_get_device(phandle, &pdev)) {
 722                 return_VALUE(-ENODEV);
 723         }
 724
 725         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 726                 return_VALUE(-ENODEV);
 727         }
 728
 729         acpi_bus_start(*device);
 730
 731         pr = acpi_driver_data(*device);
 732         if (!pr)
 733                 return_VALUE(-ENODEV);
 734
 735         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 736                 kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
 737         }
 738         return_VALUE(0);
 739 }
 740
 741 static void
 742 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 743 {
 744         struct acpi_processor *pr;
 745         struct acpi_device *device = NULL;
 746         int result;
 747
 748         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
 749
 750         switch (event) {
 751         case ACPI_NOTIFY_BUS_CHECK:
 752         case ACPI_NOTIFY_DEVICE_CHECK:
 753                 printk("Processor driver received %s event\n",
 754                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 755                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 756
 757                 if (!is_processor_present(handle))
 758                         break;
 759
 760                 if (acpi_bus_get_device(handle, &device)) {
 761                         result = acpi_processor_device_add(handle, &device);
 762                         if (result)
 763                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 764                                                   "Unable to add the device\n"));
 765                         break;
 766                 }
 767
 768                 pr = acpi_driver_data(device);
 769                 if (!pr) {
 770                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 771                                           "Driver data is NULL\n"));
 772                         break;
 773                 }
 774
 775                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 776                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 777                         break;
 778                 }
 779
 780                 result = acpi_processor_start(device);
 781                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 782                         kobject_hotplug(&device->kobj, KOBJ_ONLINE);
 783                 } else {
 784                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 785                                           "Device [%s] failed to start\n",
 786                                           acpi_device_bid(device)));
 787                 }
 788                 break;
 789         case ACPI_NOTIFY_EJECT_REQUEST:
 790                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 791                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 792
 793                 if (acpi_bus_get_device(handle, &device)) {
 794                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 795                                           "Device don't exist, dropping EJECT\n"));
 796                         break;
 797                 }
 798                 pr = acpi_driver_data(device);
 799                 if (!pr) {
 800                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 801                                           "Driver data is NULL, dropping EJECT\n"));
 802                         return_VOID;
 803                 }
 804
 805                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 806                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 807                 break;
 808         default:
 809                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 810                                   "Unsupported event [0x%x]\n", event));
 811                 break;
 812         }
 813
 814         return_VOID;
 815 }
 816
 817 static acpi_status
 818 processor_walk_namespace_cb(acpi_handle handle,
 819                             u32 lvl, void *context, void **rv)
 820 {
 821         acpi_status status;
 822         int *action = context;
 823         acpi_object_type type = 0;
 824
 825         status = acpi_get_type(handle, &type);
 826         if (ACPI_FAILURE(status))
 827                 return (AE_OK);
 828
 829         if (type != ACPI_TYPE_PROCESSOR)
 830                 return (AE_OK);
 831
 832         switch (*action) {
 833         case INSTALL_NOTIFY_HANDLER:
 834                 acpi_install_notify_handler(handle,
 835                                             ACPI_SYSTEM_NOTIFY,
 836                                             acpi_processor_hotplug_notify,
 837                                             NULL);
 838                 break;
 839         case UNINSTALL_NOTIFY_HANDLER:
 840                 acpi_remove_notify_handler(handle,
 841                                            ACPI_SYSTEM_NOTIFY,
 842                                            acpi_processor_hotplug_notify);
 843                 break;
 844         default:
 845                 break;
 846         }
 847
 848         return (AE_OK);
 849 }
 850
 851 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 852 {
 853         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
 854
 855         if (!is_processor_present(handle)) {
 856                 return_VALUE(AE_ERROR);
 857         }
 858
 859         if (acpi_map_lsapic(handle, p_cpu))
 860                 return_VALUE(AE_ERROR);
 861
 862         if (arch_register_cpu(*p_cpu)) {
 863                 acpi_unmap_lsapic(*p_cpu);
 864                 return_VALUE(AE_ERROR);
 865         }
 866
 867         return_VALUE(AE_OK);
 868 }
 869
 870 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 871 {
 872         if (cpu_online(pr->id)) {
 873                 return (-EINVAL);
 874         }
 875         arch_unregister_cpu(pr->id);
 876         acpi_unmap_lsapic(pr->id);
 877         return (0);
 878 }
 879 #else
 880 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 881 {
 882         return AE_ERROR;
 883 }
 884 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 885 {
 886         return (-EINVAL);
 887 }
 888 #endif
 889
 890 static
 891 void acpi_processor_install_hotplug_notify(void)
 892 {
 893 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 894         int action = INSTALL_NOTIFY_HANDLER;
 895         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 896                             ACPI_ROOT_OBJECT,
 897                             ACPI_UINT32_MAX,
 898                             processor_walk_namespace_cb, &action, NULL);
 899 #endif
 900 }
 901
 902 static
 903 void acpi_processor_uninstall_hotplug_notify(void)
 904 {
 905 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 906         int action = UNINSTALL_NOTIFY_HANDLER;
 907         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 908                             ACPI_ROOT_OBJECT,
 909                             ACPI_UINT32_MAX,
 910                             processor_walk_namespace_cb, &action, NULL);
 911 #endif
 912 }
 913
 914 /*
 915  * We keep the driver loaded even when ACPI is not running.
 916  * This is needed for the powernow-k8 driver, that works even without
 917  * ACPI, but needs symbols from this driver
 918  */
 919
 920 static int __init acpi_processor_init(void)
 921 {
 922         int result = 0;
 923
 924         ACPI_FUNCTION_TRACE("acpi_processor_init");
 925
 926         memset(&processors, 0, sizeof(processors));
 927         memset(&errata, 0, sizeof(errata));
 928
 929         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 930         if (!acpi_processor_dir)
 931                 return_VALUE(0);
 932         acpi_processor_dir->owner = THIS_MODULE;
 933
 934         result = acpi_bus_register_driver(&acpi_processor_driver);
 935         if (result < 0) {
 936                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 937                 return_VALUE(0);
 938         }
 939
 940         acpi_processor_install_hotplug_notify();
 941
 942         acpi_thermal_cpufreq_init();
 943
 944         acpi_processor_ppc_init();
 945
 946         return_VALUE(0);
 947 }
 948
 949 static void __exit acpi_processor_exit(void)
 950 {
 951         ACPI_FUNCTION_TRACE("acpi_processor_exit");
 952
 953         acpi_processor_ppc_exit();
 954
 955         acpi_thermal_cpufreq_exit();
 956
 957         acpi_processor_uninstall_hotplug_notify();
 958
 959         acpi_bus_unregister_driver(&acpi_processor_driver);
 960
 961         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 962
 963         return_VOID;
 964 }
 965
 966 module_init(acpi_processor_init);
 967 module_exit(acpi_processor_exit);
 968
 969 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 970
 971 MODULE_ALIAS("processor");