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
  62 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  63 #define ACPI_PROCESSOR_CLASS            "processor"
  64 #define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
  65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  66 #define ACPI_PROCESSOR_FILE_INFO        "info"
  67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  71
  72 #define ACPI_PROCESSOR_LIMIT_USER       0
  73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  74
  75 #define ACPI_STA_PRESENT 0x00000001
  76
  77 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  78 ACPI_MODULE_NAME                ("acpi_processor")
  79
  80 MODULE_AUTHOR("Paul Diefenbaugh");
  81 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
  82 MODULE_LICENSE("GPL");
  83
  84
  85 static int acpi_processor_add (struct acpi_device *device);
  86 static int acpi_processor_start (struct acpi_device *device);
  87 static int acpi_processor_remove (struct acpi_device *device, int type);
  88 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  89 static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data);
  90 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  91 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  92
  93 static struct acpi_driver acpi_processor_driver = {
  94         .name =         ACPI_PROCESSOR_DRIVER_NAME,
  95         .class =        ACPI_PROCESSOR_CLASS,
  96         .ids =          ACPI_PROCESSOR_HID,
  97         .ops =          {
  98                                 .add =          acpi_processor_add,
  99                                 .remove =       acpi_processor_remove,
 100                                 .start  =       acpi_processor_start,
 101                         },
 102 };
 103
 104 #define INSTALL_NOTIFY_HANDLER          1
 105 #define UNINSTALL_NOTIFY_HANDLER        2
 106
 107
 108 static struct file_operations acpi_processor_info_fops = {
 109         .open           = acpi_processor_info_open_fs,
 110         .read           = seq_read,
 111         .llseek         = seq_lseek,
 112         .release        = single_release,
 113 };
 114
 115
 116 struct acpi_processor   *processors[NR_CPUS];
 117 struct acpi_processor_errata errata;
 118
 119
 120 /* --------------------------------------------------------------------------
 121                                 Errata Handling
 122    -------------------------------------------------------------------------- */
 123
 124 static int
 125 acpi_processor_errata_piix4 (
 126         struct pci_dev          *dev)
 127 {
 128         u8                      rev = 0;
 129         u8                      value1 = 0;
 130         u8                      value2 = 0;
 131
 132         ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
 133
 134         if (!dev)
 135                 return_VALUE(-EINVAL);
 136
 137         /*
 138          * Note that 'dev' references the PIIX4 ACPI Controller.
 139          */
 140
 141         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 142
 143         switch (rev) {
 144         case 0:
 145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 146                 break;
 147         case 1:
 148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 149                 break;
 150         case 2:
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 152                 break;
 153         case 3:
 154                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 155                 break;
 156         default:
 157                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 158                 break;
 159         }
 160
 161         switch (rev) {
 162
 163         case 0:         /* PIIX4 A-step */
 164         case 1:         /* PIIX4 B-step */
 165                 /*
 166                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 167                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 168                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 169                  * 2002 PIIX4 specification update.  Applies to only older
 170                  * PIIX4 models.
 171                  */
 172                 errata.piix4.throttle = 1;
 173
 174         case 2:         /* PIIX4E */
 175         case 3:         /* PIIX4M */
 176                 /*
 177                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 178                  * Livelock") from the January 2002 PIIX4 specification update.
 179                  * Applies to all PIIX4 models.
 180                  */
 181
 182                 /*
 183                  * BM-IDE
 184                  * ------
 185                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 186                  * Status register address.  We'll use this later to read
 187                  * each IDE controller's DMA status to make sure we catch all
 188                  * DMA activity.
 189                  */
 190                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 191                            PCI_DEVICE_ID_INTEL_82371AB,
 192                            PCI_ANY_ID, PCI_ANY_ID, NULL);
 193                 if (dev) {
 194                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 195                         pci_dev_put(dev);
 196                 }
 197
 198                 /*
 199                  * Type-F DMA
 200                  * ----------
 201                  * Find the PIIX4 ISA Controller and read the Motherboard
 202                  * DMA controller's status to see if Type-F (Fast) DMA mode
 203                  * is enabled (bit 7) on either channel.  Note that we'll
 204                  * disable C3 support if this is enabled, as some legacy
 205                  * devices won't operate well if fast DMA is disabled.
 206                  */
 207                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 208                         PCI_DEVICE_ID_INTEL_82371AB_0,
 209                         PCI_ANY_ID, PCI_ANY_ID, NULL);
 210                 if (dev) {
 211                         pci_read_config_byte(dev, 0x76, &value1);
 212                         pci_read_config_byte(dev, 0x77, &value2);
 213                         if ((value1 & 0x80) || (value2 & 0x80))
 214                                 errata.piix4.fdma = 1;
 215                         pci_dev_put(dev);
 216                 }
 217
 218                 break;
 219         }
 220
 221         if (errata.piix4.bmisx)
 222                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 223                         "Bus master activity detection (BM-IDE) erratum enabled\n"));
 224         if (errata.piix4.fdma)
 225                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 226                         "Type-F DMA livelock erratum (C3 disabled)\n"));
 227
 228         return_VALUE(0);
 229 }
 230
 231
 232 int
 233 acpi_processor_errata (
 234         struct acpi_processor   *pr)
 235 {
 236         int                     result = 0;
 237         struct pci_dev          *dev = NULL;
 238
 239         ACPI_FUNCTION_TRACE("acpi_processor_errata");
 240
 241         if (!pr)
 242                 return_VALUE(-EINVAL);
 243
 244         /*
 245          * PIIX4
 246          */
 247         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 248                 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, PCI_ANY_ID, NULL);
 249         if (dev) {
 250                 result = acpi_processor_errata_piix4(dev);
 251                 pci_dev_put(dev);
 252         }
 253
 254         return_VALUE(result);
 255 }
 256
 257
 258 /* --------------------------------------------------------------------------
 259                               Common ACPI processor fucntions
 260    -------------------------------------------------------------------------- */
 261
 262 /*
 263  * _PDC is required for a BIOS-OS handshake for most of the newer
 264  * ACPI processor features.
 265  */
 266
 267 int acpi_processor_set_pdc(struct acpi_processor *pr,
 268                                 struct acpi_object_list *pdc_in)
 269 {
 270         acpi_status             status = AE_OK;
 271         u32                     arg0_buf[3];
 272         union acpi_object       arg0 = {ACPI_TYPE_BUFFER};
 273         struct acpi_object_list no_object = {1, &arg0};
 274         struct acpi_object_list *pdc;
 275
 276         ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
 277
 278         arg0.buffer.length = 12;
 279         arg0.buffer.pointer = (u8 *) arg0_buf;
 280         arg0_buf[0] = ACPI_PDC_REVISION_ID;
 281         arg0_buf[1] = 0;
 282         arg0_buf[2] = 0;
 283
 284         pdc = (pdc_in) ? pdc_in : &no_object;
 285
 286         status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
 287
 288         if ((ACPI_FAILURE(status)) && (pdc_in))
 289                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
 290
 291         return_VALUE(status);
 292 }
 293
 294
 295 /* --------------------------------------------------------------------------
 296                               FS Interface (/proc)
 297    -------------------------------------------------------------------------- */
 298
 299 static struct proc_dir_entry    *acpi_processor_dir = NULL;
 300
 301 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 302 {
 303         struct acpi_processor   *pr = (struct acpi_processor *)seq->private;
 304
 305         ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
 306
 307         if (!pr)
 308                 goto end;
 309
 310         seq_printf(seq, "processor id:            %d\n"
 311                         "acpi id:                 %d\n"
 312                         "bus mastering control:   %s\n"
 313                         "power management:        %s\n"
 314                         "throttling control:      %s\n"
 315                         "limit interface:         %s\n",
 316                         pr->id,
 317                         pr->acpi_id,
 318                         pr->flags.bm_control ? "yes" : "no",
 319                         pr->flags.power ? "yes" : "no",
 320                         pr->flags.throttling ? "yes" : "no",
 321                         pr->flags.limit ? "yes" : "no");
 322
 323 end:
 324         return_VALUE(0);
 325 }
 326
 327 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 328 {
 329         return single_open(file, acpi_processor_info_seq_show,
 330                                                 PDE(inode)->data);
 331 }
 332
 333
 334 static int
 335 acpi_processor_add_fs (
 336         struct acpi_device      *device)
 337 {
 338         struct proc_dir_entry   *entry = NULL;
 339
 340         ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
 341
 342         if (!acpi_device_dir(device)) {
 343                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 344                         acpi_processor_dir);
 345                 if (!acpi_device_dir(device))
 346                         return_VALUE(-ENODEV);
 347         }
 348         acpi_device_dir(device)->owner = THIS_MODULE;
 349
 350         /* 'info' [R] */
 351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 352                 S_IRUGO, acpi_device_dir(device));
 353         if (!entry)
 354                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 355                         "Unable to create '%s' fs entry\n",
 356                         ACPI_PROCESSOR_FILE_INFO));
 357         else {
 358                 entry->proc_fops = &acpi_processor_info_fops;
 359                 entry->data = acpi_driver_data(device);
 360                 entry->owner = THIS_MODULE;
 361         }
 362
 363         /* 'throttling' [R/W] */
 364         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 365                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 366         if (!entry)
 367                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 368                         "Unable to create '%s' fs entry\n",
 369                         ACPI_PROCESSOR_FILE_THROTTLING));
 370         else {
 371                 entry->proc_fops = &acpi_processor_throttling_fops;
 372                 entry->proc_fops->write = acpi_processor_write_throttling;
 373                 entry->data = acpi_driver_data(device);
 374                 entry->owner = THIS_MODULE;
 375         }
 376
 377         /* 'limit' [R/W] */
 378         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 379                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 380         if (!entry)
 381                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 382                         "Unable to create '%s' fs entry\n",
 383                         ACPI_PROCESSOR_FILE_LIMIT));
 384         else {
 385                 entry->proc_fops = &acpi_processor_limit_fops;
 386                 entry->proc_fops->write = acpi_processor_write_limit;
 387                 entry->data = acpi_driver_data(device);
 388                 entry->owner = THIS_MODULE;
 389         }
 390
 391         return_VALUE(0);
 392 }
 393
 394
 395 static int
 396 acpi_processor_remove_fs (
 397         struct acpi_device      *device)
 398 {
 399         ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
 400
 401         if (acpi_device_dir(device)) {
 402                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,acpi_device_dir(device));
 403                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 404                         acpi_device_dir(device));
 405                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,acpi_device_dir(device));
 406                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 407                 acpi_device_dir(device) = NULL;
 408         }
 409
 410         return_VALUE(0);
 411 }
 412
 413 /* Use the acpiid in MADT to map cpus in case of SMP */
 414 #ifndef CONFIG_SMP
 415 #define convert_acpiid_to_cpu(acpi_id) (0xff)
 416 #else
 417
 418 #ifdef CONFIG_IA64
 419 #define arch_acpiid_to_apicid   ia64_acpiid_to_sapicid
 420 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 421 #define ARCH_BAD_APICID         (0xffff)
 422 #else
 423 #define arch_acpiid_to_apicid   x86_acpiid_to_apicid
 424 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 425 #define ARCH_BAD_APICID         (0xff)
 426 #endif
 427
 428 static u8 convert_acpiid_to_cpu(u8 acpi_id)
 429 {
 430         u16 apic_id;
 431         int i;
 432
 433         apic_id = arch_acpiid_to_apicid[acpi_id];
 434         if (apic_id == ARCH_BAD_APICID)
 435                 return -1;
 436
 437         for (i = 0; i < NR_CPUS; i++) {
 438                 if (arch_cpu_to_apicid[i] == apic_id)
 439                         return i;
 440         }
 441         return -1;
 442 }
 443 #endif
 444
 445 /* --------------------------------------------------------------------------
 446                                  Driver Interface
 447    -------------------------------------------------------------------------- */
 448
 449 static int
 450 acpi_processor_get_info (
 451         struct acpi_processor   *pr)
 452 {
 453         acpi_status             status = 0;
 454         union acpi_object       object = {0};
 455         struct acpi_buffer      buffer = {sizeof(union acpi_object), &object};
 456         u8                      cpu_index;
 457         static int              cpu0_initialized;
 458
 459         ACPI_FUNCTION_TRACE("acpi_processor_get_info");
 460
 461         if (!pr)
 462                 return_VALUE(-EINVAL);
 463
 464         if (num_online_cpus() > 1)
 465                 errata.smp = TRUE;
 466
 467         acpi_processor_errata(pr);
 468
 469         /*
 470          * Check to see if we have bus mastering arbitration control.  This
 471          * is required for proper C3 usage (to maintain cache coherency).
 472          */
 473         if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
 474                 pr->flags.bm_control = 1;
 475                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 476                         "Bus mastering arbitration control present\n"));
 477         }
 478         else
 479                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 480                         "No bus mastering arbitration control\n"));
 481
 482         /*
 483          * Evalute the processor object.  Note that it is common on SMP to
 484          * have the first (boot) processor with a valid PBLK address while
 485          * all others have a NULL address.
 486          */
 487         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 488         if (ACPI_FAILURE(status)) {
 489                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 490                         "Error evaluating processor object\n"));
 491                 return_VALUE(-ENODEV);
 492         }
 493
 494         /*
 495          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 496          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 497          */
 498         pr->acpi_id = object.processor.proc_id;
 499
 500         cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
 501
 502         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 503         if ( !cpu0_initialized && (cpu_index == 0xff) &&
 504                         (num_online_cpus() == 1)) {
 505                 cpu_index = 0;
 506         }
 507
 508         cpu0_initialized = 1;
 509
 510         pr->id = cpu_index;
 511
 512         /*
 513          *  Extra Processor objects may be enumerated on MP systems with
 514          *  less than the max # of CPUs. They should be ignored _iff
 515          *  they are physically not present.
 516          */
 517         if (cpu_index >=  NR_CPUS) {
 518                 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 519                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 520                                 "Error getting cpuindex for acpiid 0x%x\n",
 521                                 pr->acpi_id));
 522                         return_VALUE(-ENODEV);
 523                 }
 524         }
 525
 526         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 527                 pr->acpi_id));
 528
 529         if (!object.processor.pblk_address)
 530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 531         else if (object.processor.pblk_length != 6)
 532                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
 533                         object.processor.pblk_length));
 534         else {
 535                 pr->throttling.address = object.processor.pblk_address;
 536                 pr->throttling.duty_offset = acpi_fadt.duty_offset;
 537                 pr->throttling.duty_width = acpi_fadt.duty_width;
 538
 539                 pr->pblk = object.processor.pblk_address;
 540
 541                 /*
 542                  * We don't care about error returns - we just try to mark
 543                  * these reserved so that nobody else is confused into thinking
 544                  * that this region might be unused..
 545                  *
 546                  * (In particular, allocating the IO range for Cardbus)
 547                  */
 548                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 549         }
 550
 551 #ifdef CONFIG_CPU_FREQ
 552         acpi_processor_ppc_has_changed(pr);
 553 #endif
 554         acpi_processor_get_throttling_info(pr);
 555         acpi_processor_get_limit_info(pr);
 556
 557         return_VALUE(0);
 558 }
 559
 560 static int
 561 acpi_processor_start(
 562         struct acpi_device      *device)
 563 {
 564         int                     result = 0;
 565         acpi_status             status = AE_OK;
 566         struct acpi_processor   *pr;
 567
 568         ACPI_FUNCTION_TRACE("acpi_processor_start");
 569
 570         pr = acpi_driver_data(device);
 571
 572         result = acpi_processor_get_info(pr);
 573         if (result) {
 574                 /* Processor is physically not present */
 575                 return_VALUE(0);
 576         }
 577
 578         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 579
 580         processors[pr->id] = pr;
 581
 582         result = acpi_processor_add_fs(device);
 583         if (result)
 584                 goto end;
 585
 586         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 587                 acpi_processor_notify, pr);
 588         if (ACPI_FAILURE(status)) {
 589                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 590                         "Error installing device notify handler\n"));
 591         }
 592
 593         acpi_processor_power_init(pr, device);
 594
 595         if (pr->flags.throttling) {
 596                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 597                         acpi_device_name(device), acpi_device_bid(device));
 598                 printk(" %d throttling states", pr->throttling.state_count);
 599                 printk(")\n");
 600         }
 601
 602 end:
 603
 604         return_VALUE(result);
 605 }
 606
 607
 608
 609 static void
 610 acpi_processor_notify (
 611         acpi_handle             handle,
 612         u32                     event,
 613         void                    *data)
 614 {
 615         struct acpi_processor   *pr = (struct acpi_processor *) data;
 616         struct acpi_device      *device = NULL;
 617
 618         ACPI_FUNCTION_TRACE("acpi_processor_notify");
 619
 620         if (!pr)
 621                 return_VOID;
 622
 623         if (acpi_bus_get_device(pr->handle, &device))
 624                 return_VOID;
 625
 626         switch (event) {
 627         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 628                 acpi_processor_ppc_has_changed(pr);
 629                 acpi_bus_generate_event(device, event,
 630                         pr->performance_platform_limit);
 631                 break;
 632         case ACPI_PROCESSOR_NOTIFY_POWER:
 633                 acpi_processor_cst_has_changed(pr);
 634                 acpi_bus_generate_event(device, event, 0);
 635                 break;
 636         default:
 637                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 638                         "Unsupported event [0x%x]\n", event));
 639                 break;
 640         }
 641
 642         return_VOID;
 643 }
 644
 645
 646 static int
 647 acpi_processor_add (
 648         struct acpi_device      *device)
 649 {
 650         struct acpi_processor   *pr = NULL;
 651
 652         ACPI_FUNCTION_TRACE("acpi_processor_add");
 653
 654         if (!device)
 655                 return_VALUE(-EINVAL);
 656
 657         pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 658         if (!pr)
 659                 return_VALUE(-ENOMEM);
 660         memset(pr, 0, sizeof(struct acpi_processor));
 661
 662         pr->handle = device->handle;
 663         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 664         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 665         acpi_driver_data(device) = pr;
 666
 667         return_VALUE(0);
 668 }
 669
 670
 671 static int
 672 acpi_processor_remove (
 673         struct acpi_device      *device,
 674         int                     type)
 675 {
 676         acpi_status             status = AE_OK;
 677         struct acpi_processor   *pr = NULL;
 678
 679         ACPI_FUNCTION_TRACE("acpi_processor_remove");
 680
 681         if (!device || !acpi_driver_data(device))
 682                 return_VALUE(-EINVAL);
 683
 684         pr = (struct acpi_processor *) acpi_driver_data(device);
 685
 686         if (pr->id >= NR_CPUS) {
 687                 kfree(pr);
 688                 return_VALUE(0);
 689         }
 690
 691         if (type == ACPI_BUS_REMOVAL_EJECT) {
 692                 if (acpi_processor_handle_eject(pr))
 693                         return_VALUE(-EINVAL);
 694         }
 695
 696         acpi_processor_power_exit(pr, device);
 697
 698         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 699                 acpi_processor_notify);
 700         if (ACPI_FAILURE(status)) {
 701                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 702                         "Error removing notify handler\n"));
 703         }
 704
 705         acpi_processor_remove_fs(device);
 706
 707         processors[pr->id] = NULL;
 708
 709         kfree(pr);
 710
 711         return_VALUE(0);
 712 }
 713
 714 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 715 /****************************************************************************
 716  *      Acpi processor hotplug support                                      *
 717  ****************************************************************************/
 718
 719 static int is_processor_present(acpi_handle handle);
 720
 721 static int
 722 is_processor_present(
 723         acpi_handle handle)
 724 {
 725         acpi_status             status;
 726         unsigned long           sta = 0;
 727
 728         ACPI_FUNCTION_TRACE("is_processor_present");
 729
 730         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 731         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 732                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 733                         "Processor Device is not present\n"));
 734                 return_VALUE(0);
 735         }
 736         return_VALUE(1);
 737 }
 738
 739
 740 static
 741 int acpi_processor_device_add(
 742         acpi_handle     handle,
 743         struct acpi_device **device)
 744 {
 745         acpi_handle             phandle;
 746         struct acpi_device      *pdev;
 747         struct acpi_processor   *pr;
 748
 749         ACPI_FUNCTION_TRACE("acpi_processor_device_add");
 750
 751         if (acpi_get_parent(handle, &phandle)) {
 752                 return_VALUE(-ENODEV);
 753         }
 754
 755         if (acpi_bus_get_device(phandle, &pdev)) {
 756                 return_VALUE(-ENODEV);
 757         }
 758
 759         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 760                 return_VALUE(-ENODEV);
 761         }
 762
 763         acpi_bus_start(*device);
 764
 765         pr = acpi_driver_data(*device);
 766         if (!pr)
 767                 return_VALUE(-ENODEV);
 768
 769         if ((pr->id >=0) && (pr->id < NR_CPUS)) {
 770                 kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
 771         }
 772         return_VALUE(0);
 773 }
 774
 775
 776 static void
 777 acpi_processor_hotplug_notify (
 778         acpi_handle             handle,
 779         u32                     event,
 780         void                    *data)
 781 {
 782         struct acpi_processor   *pr;
 783         struct acpi_device      *device = NULL;
 784         int result;
 785
 786         ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
 787
 788         switch (event) {
 789         case ACPI_NOTIFY_BUS_CHECK:
 790         case ACPI_NOTIFY_DEVICE_CHECK:
 791                 printk("Processor driver received %s event\n",
 792                         (event==ACPI_NOTIFY_BUS_CHECK)?
 793                         "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
 794
 795                 if (!is_processor_present(handle))
 796                         break;
 797
 798                 if (acpi_bus_get_device(handle, &device)) {
 799                         result = acpi_processor_device_add(handle, &device);
 800                         if (result)
 801                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 802                                         "Unable to add the device\n"));
 803                         break;
 804                 }
 805
 806                 pr = acpi_driver_data(device);
 807                 if (!pr) {
 808                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 809                                 "Driver data is NULL\n"));
 810                         break;
 811                 }
 812
 813                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 814                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 815                         break;
 816                 }
 817
 818                 result = acpi_processor_start(device);
 819                 if ((!result) && ((pr->id >=0) && (pr->id < NR_CPUS))) {
 820                         kobject_hotplug(&device->kobj, KOBJ_ONLINE);
 821                 } else {
 822                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 823                                 "Device [%s] failed to start\n",
 824                                 acpi_device_bid(device)));
 825                 }
 826         break;
 827         case ACPI_NOTIFY_EJECT_REQUEST:
 828                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"received ACPI_NOTIFY_EJECT_REQUEST\n"));
 829
 830                 if (acpi_bus_get_device(handle, &device)) {
 831                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Device don't exist, dropping EJECT\n"));
 832                         break;
 833                 }
 834                 pr = acpi_driver_data(device);
 835                 if (!pr) {
 836                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Driver data is NULL, dropping EJECT\n"));
 837                         return_VOID;
 838                 }
 839
 840                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 841                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
 842                 break;
 843         default:
 844                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 845                         "Unsupported event [0x%x]\n", event));
 846                 break;
 847         }
 848
 849         return_VOID;
 850 }
 851
 852 static acpi_status
 853 processor_walk_namespace_cb(acpi_handle handle,
 854         u32 lvl,
 855         void *context,
 856         void **rv)
 857 {
 858         acpi_status                     status;
 859         int *action = context;
 860         acpi_object_type        type = 0;
 861
 862         status = acpi_get_type(handle, &type);
 863         if (ACPI_FAILURE(status))
 864                 return(AE_OK);
 865
 866         if (type != ACPI_TYPE_PROCESSOR)
 867                 return(AE_OK);
 868
 869         switch(*action) {
 870         case INSTALL_NOTIFY_HANDLER:
 871                 acpi_install_notify_handler(handle,
 872                         ACPI_SYSTEM_NOTIFY,
 873                         acpi_processor_hotplug_notify,
 874                         NULL);
 875                 break;
 876         case UNINSTALL_NOTIFY_HANDLER:
 877                 acpi_remove_notify_handler(handle,
 878                         ACPI_SYSTEM_NOTIFY,
 879                         acpi_processor_hotplug_notify);
 880                 break;
 881         default:
 882                 break;
 883         }
 884
 885         return(AE_OK);
 886 }
 887
 888
 889 static acpi_status
 890 acpi_processor_hotadd_init(
 891         acpi_handle             handle,
 892         int                     *p_cpu)
 893 {
 894         ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
 895
 896         if (!is_processor_present(handle)) {
 897                 return_VALUE(AE_ERROR);
 898         }
 899
 900         if (acpi_map_lsapic(handle, p_cpu))
 901                 return_VALUE(AE_ERROR);
 902
 903         if (arch_register_cpu(*p_cpu)) {
 904                 acpi_unmap_lsapic(*p_cpu);
 905                 return_VALUE(AE_ERROR);
 906         }
 907
 908         return_VALUE(AE_OK);
 909 }
 910
 911
 912 static int
 913 acpi_processor_handle_eject(struct acpi_processor *pr)
 914 {
 915         if (cpu_online(pr->id)) {
 916                 return(-EINVAL);
 917         }
 918         arch_unregister_cpu(pr->id);
 919         acpi_unmap_lsapic(pr->id);
 920         return(0);
 921 }
 922 #else
 923 static acpi_status
 924 acpi_processor_hotadd_init(
 925         acpi_handle             handle,
 926         int                     *p_cpu)
 927 {
 928         return AE_ERROR;
 929 }
 930 static int
 931 acpi_processor_handle_eject(struct acpi_processor *pr)
 932 {
 933         return(-EINVAL);
 934 }
 935 #endif
 936
 937
 938 static
 939 void acpi_processor_install_hotplug_notify(void)
 940 {
 941 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 942         int action = INSTALL_NOTIFY_HANDLER;
 943         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 944                                      ACPI_ROOT_OBJECT,
 945                                      ACPI_UINT32_MAX,
 946                                      processor_walk_namespace_cb,
 947                                      &action, NULL);
 948 #endif
 949 }
 950
 951
 952 static
 953 void acpi_processor_uninstall_hotplug_notify(void)
 954 {
 955 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 956         int action = UNINSTALL_NOTIFY_HANDLER;
 957         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 958                                      ACPI_ROOT_OBJECT,
 959                                      ACPI_UINT32_MAX,
 960                                      processor_walk_namespace_cb,
 961                                      &action, NULL);
 962 #endif
 963 }
 964
 965 /*
 966  * We keep the driver loaded even when ACPI is not running.
 967  * This is needed for the powernow-k8 driver, that works even without
 968  * ACPI, but needs symbols from this driver
 969  */
 970
 971 static int __init
 972 acpi_processor_init (void)
 973 {
 974         int                     result = 0;
 975
 976         ACPI_FUNCTION_TRACE("acpi_processor_init");
 977
 978         memset(&processors, 0, sizeof(processors));
 979         memset(&errata, 0, sizeof(errata));
 980
 981         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 982         if (!acpi_processor_dir)
 983                 return_VALUE(0);
 984         acpi_processor_dir->owner = THIS_MODULE;
 985
 986         result = acpi_bus_register_driver(&acpi_processor_driver);
 987         if (result < 0) {
 988                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 989                 return_VALUE(0);
 990         }
 991
 992         acpi_processor_install_hotplug_notify();
 993
 994         acpi_thermal_cpufreq_init();
 995
 996         acpi_processor_ppc_init();
 997
 998         return_VALUE(0);
 999 }
1000
1001
1002 static void __exit
1003 acpi_processor_exit (void)
1004 {
1005         ACPI_FUNCTION_TRACE("acpi_processor_exit");
1006
1007         acpi_processor_ppc_exit();
1008
1009         acpi_thermal_cpufreq_exit();
1010
1011         acpi_processor_uninstall_hotplug_notify();
1012
1013         acpi_bus_unregister_driver(&acpi_processor_driver);
1014
1015         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1016
1017         return_VOID;
1018 }
1019
1020
1021 module_init(acpi_processor_init);
1022 module_exit(acpi_processor_exit);
1023
1024 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1025
1026 MODULE_ALIAS("processor");