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