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 const struct file_operations acpi_processor_info_fops = {
 106         .open = acpi_processor_info_open_fs,
 107         .read = seq_read,
 108         .llseek = seq_lseek,
 109         .release = single_release,
 110 };
 111
 112 struct acpi_processor *processors[NR_CPUS];
 113 struct acpi_processor_errata errata __read_mostly;
 114
 115 /* --------------------------------------------------------------------------
 116                                 Errata Handling
 117    -------------------------------------------------------------------------- */
 118
 119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 120 {
 121         u8 rev = 0;
 122         u8 value1 = 0;
 123         u8 value2 = 0;
 124
 125
 126         if (!dev)
 127                 return -EINVAL;
 128
 129         /*
 130          * Note that 'dev' references the PIIX4 ACPI Controller.
 131          */
 132
 133         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 134
 135         switch (rev) {
 136         case 0:
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 138                 break;
 139         case 1:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 141                 break;
 142         case 2:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 144                 break;
 145         case 3:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 147                 break;
 148         default:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 150                 break;
 151         }
 152
 153         switch (rev) {
 154
 155         case 0:         /* PIIX4 A-step */
 156         case 1:         /* PIIX4 B-step */
 157                 /*
 158                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 159                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 160                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 161                  * 2002 PIIX4 specification update.  Applies to only older
 162                  * PIIX4 models.
 163                  */
 164                 errata.piix4.throttle = 1;
 165
 166         case 2:         /* PIIX4E */
 167         case 3:         /* PIIX4M */
 168                 /*
 169                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 170                  * Livelock") from the January 2002 PIIX4 specification update.
 171                  * Applies to all PIIX4 models.
 172                  */
 173
 174                 /*
 175                  * BM-IDE
 176                  * ------
 177                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 178                  * Status register address.  We'll use this later to read
 179                  * each IDE controller's DMA status to make sure we catch all
 180                  * DMA activity.
 181                  */
 182                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 183                                      PCI_DEVICE_ID_INTEL_82371AB,
 184                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 185                 if (dev) {
 186                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 187                         pci_dev_put(dev);
 188                 }
 189
 190                 /*
 191                  * Type-F DMA
 192                  * ----------
 193                  * Find the PIIX4 ISA Controller and read the Motherboard
 194                  * DMA controller's status to see if Type-F (Fast) DMA mode
 195                  * is enabled (bit 7) on either channel.  Note that we'll
 196                  * disable C3 support if this is enabled, as some legacy
 197                  * devices won't operate well if fast DMA is disabled.
 198                  */
 199                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 200                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 201                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 202                 if (dev) {
 203                         pci_read_config_byte(dev, 0x76, &value1);
 204                         pci_read_config_byte(dev, 0x77, &value2);
 205                         if ((value1 & 0x80) || (value2 & 0x80))
 206                                 errata.piix4.fdma = 1;
 207                         pci_dev_put(dev);
 208                 }
 209
 210                 break;
 211         }
 212
 213         if (errata.piix4.bmisx)
 214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 215                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 216         if (errata.piix4.fdma)
 217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 218                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 219
 220         return 0;
 221 }
 222
 223 static int acpi_processor_errata(struct acpi_processor *pr)
 224 {
 225         int result = 0;
 226         struct pci_dev *dev = NULL;
 227
 228
 229         if (!pr)
 230                 return -EINVAL;
 231
 232         /*
 233          * PIIX4
 234          */
 235         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 236                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 237                              PCI_ANY_ID, NULL);
 238         if (dev) {
 239                 result = acpi_processor_errata_piix4(dev);
 240                 pci_dev_put(dev);
 241         }
 242
 243         return result;
 244 }
 245
 246 /* --------------------------------------------------------------------------
 247                               Common ACPI processor functions
 248    -------------------------------------------------------------------------- */
 249
 250 /*
 251  * _PDC is required for a BIOS-OS handshake for most of the newer
 252  * ACPI processor features.
 253  */
 254 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 255 {
 256         struct acpi_object_list *pdc_in = pr->pdc;
 257         acpi_status status = AE_OK;
 258
 259
 260         if (!pdc_in)
 261                 return status;
 262
 263         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 264
 265         if (ACPI_FAILURE(status))
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 268
 269         return status;
 270 }
 271
 272 /* --------------------------------------------------------------------------
 273                               FS Interface (/proc)
 274    -------------------------------------------------------------------------- */
 275
 276 static struct proc_dir_entry *acpi_processor_dir = NULL;
 277
 278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 279 {
 280         struct acpi_processor *pr = seq->private;
 281
 282
 283         if (!pr)
 284                 goto end;
 285
 286         seq_printf(seq, "processor id:            %d\n"
 287                    "acpi id:                 %d\n"
 288                    "bus mastering control:   %s\n"
 289                    "power management:        %s\n"
 290                    "throttling control:      %s\n"
 291                    "limit interface:         %s\n",
 292                    pr->id,
 293                    pr->acpi_id,
 294                    pr->flags.bm_control ? "yes" : "no",
 295                    pr->flags.power ? "yes" : "no",
 296                    pr->flags.throttling ? "yes" : "no",
 297                    pr->flags.limit ? "yes" : "no");
 298
 299       end:
 300         return 0;
 301 }
 302
 303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 304 {
 305         return single_open(file, acpi_processor_info_seq_show,
 306                            PDE(inode)->data);
 307 }
 308
 309 static int acpi_processor_add_fs(struct acpi_device *device)
 310 {
 311         struct proc_dir_entry *entry = NULL;
 312
 313
 314         if (!acpi_device_dir(device)) {
 315                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 316                                                      acpi_processor_dir);
 317                 if (!acpi_device_dir(device))
 318                         return -ENODEV;
 319         }
 320         acpi_device_dir(device)->owner = THIS_MODULE;
 321
 322         /* 'info' [R] */
 323         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 324                                   S_IRUGO, acpi_device_dir(device));
 325         if (!entry)
 326                 return -EIO;
 327         else {
 328                 entry->proc_fops = &acpi_processor_info_fops;
 329                 entry->data = acpi_driver_data(device);
 330                 entry->owner = THIS_MODULE;
 331         }
 332
 333         /* 'throttling' [R/W] */
 334         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 335                                   S_IFREG | S_IRUGO | S_IWUSR,
 336                                   acpi_device_dir(device));
 337         if (!entry)
 338                 return -EIO;
 339         else {
 340                 entry->proc_fops = &acpi_processor_throttling_fops;
 341                 entry->data = acpi_driver_data(device);
 342                 entry->owner = THIS_MODULE;
 343         }
 344
 345         /* 'limit' [R/W] */
 346         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 347                                   S_IFREG | S_IRUGO | S_IWUSR,
 348                                   acpi_device_dir(device));
 349         if (!entry)
 350                 return -EIO;
 351         else {
 352                 entry->proc_fops = &acpi_processor_limit_fops;
 353                 entry->data = acpi_driver_data(device);
 354                 entry->owner = THIS_MODULE;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int acpi_processor_remove_fs(struct acpi_device *device)
 361 {
 362
 363         if (acpi_device_dir(device)) {
 364                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 365                                   acpi_device_dir(device));
 366                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 367                                   acpi_device_dir(device));
 368                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 369                                   acpi_device_dir(device));
 370                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 371                 acpi_device_dir(device) = NULL;
 372         }
 373
 374         return 0;
 375 }
 376
 377 /* Use the acpiid in MADT to map cpus in case of SMP */
 378
 379 #ifndef CONFIG_SMP
 380 #define convert_acpiid_to_cpu(acpi_id) (-1)
 381 #else
 382
 383 static struct acpi_table_madt *madt;
 384
 385 static int map_lapic_id(struct acpi_subtable_header *entry,
 386                  u32 acpi_id, int *apic_id)
 387 {
 388         struct acpi_madt_local_apic *lapic =
 389                 (struct acpi_madt_local_apic *)entry;
 390         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 391             lapic->processor_id == acpi_id) {
 392                 *apic_id = lapic->id;
 393                 return 1;
 394         }
 395         return 0;
 396 }
 397
 398 static int map_lsapic_id(struct acpi_subtable_header *entry,
 399                   u32 acpi_id, int *apic_id)
 400 {
 401         struct acpi_madt_local_sapic *lsapic =
 402                 (struct acpi_madt_local_sapic *)entry;
 403         /* Only check enabled APICs*/
 404         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 405                 /* First check against id */
 406                 if (lsapic->processor_id == acpi_id) {
 407                         *apic_id = lsapic->id;
 408                         return 1;
 409                 /* Check against optional uid */
 410                 } else if (entry->length >= 16 &&
 411                         lsapic->uid == acpi_id) {
 412                         *apic_id = lsapic->uid;
 413                         return 1;
 414                 }
 415         }
 416         return 0;
 417 }
 418
 419 #ifdef CONFIG_IA64
 420 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 421 #else
 422 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 423 #endif
 424
 425 static int map_madt_entry(u32 acpi_id)
 426 {
 427         unsigned long madt_end, entry;
 428         int apic_id = -1;
 429
 430         if (!madt)
 431                 return apic_id;
 432
 433         entry = (unsigned long)madt;
 434         madt_end = entry + madt->header.length;
 435
 436         /* Parse all entries looking for a match. */
 437
 438         entry += sizeof(struct acpi_table_madt);
 439         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 440                 struct acpi_subtable_header *header =
 441                         (struct acpi_subtable_header *)entry;
 442                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 443                         if (map_lapic_id(header, acpi_id, &apic_id))
 444                                 break;
 445                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 446                         if (map_lsapic_id(header, acpi_id, &apic_id))
 447                                 break;
 448                 }
 449                 entry += header->length;
 450         }
 451         return apic_id;
 452 }
 453
 454 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 455 {
 456         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 457         union acpi_object *obj;
 458         struct acpi_subtable_header *header;
 459         int apic_id = -1;
 460
 461         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 462                 goto exit;
 463
 464         if (!buffer.length || !buffer.pointer)
 465                 goto exit;
 466
 467         obj = buffer.pointer;
 468         if (obj->type != ACPI_TYPE_BUFFER ||
 469             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 470                 goto exit;
 471         }
 472
 473         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 474         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 475                 map_lapic_id(header, acpi_id, &apic_id);
 476         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 477                 map_lsapic_id(header, acpi_id, &apic_id);
 478         }
 479
 480 exit:
 481         if (buffer.pointer)
 482                 kfree(buffer.pointer);
 483         return apic_id;
 484 }
 485
 486 static int get_apic_id(acpi_handle handle, u32 acpi_id)
 487 {
 488         int i;
 489         int apic_id = -1;
 490
 491         apic_id = map_mat_entry(handle, acpi_id);
 492         if (apic_id == -1)
 493                 apic_id = map_madt_entry(acpi_id);
 494         if (apic_id == -1)
 495                 return apic_id;
 496
 497         for (i = 0; i < NR_CPUS; ++i) {
 498                 if (arch_cpu_to_apicid[i] == apic_id)
 499                         return i;
 500         }
 501         return -1;
 502 }
 503 #endif
 504
 505 /* --------------------------------------------------------------------------
 506                                  Driver Interface
 507    -------------------------------------------------------------------------- */
 508
 509 static int acpi_processor_get_info(struct acpi_processor *pr)
 510 {
 511         acpi_status status = 0;
 512         union acpi_object object = { 0 };
 513         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 514         int cpu_index;
 515         static int cpu0_initialized;
 516
 517
 518         if (!pr)
 519                 return -EINVAL;
 520
 521         if (num_online_cpus() > 1)
 522                 errata.smp = TRUE;
 523
 524         acpi_processor_errata(pr);
 525
 526         /*
 527          * Check to see if we have bus mastering arbitration control.  This
 528          * is required for proper C3 usage (to maintain cache coherency).
 529          */
 530         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 531                 pr->flags.bm_control = 1;
 532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 533                                   "Bus mastering arbitration control present\n"));
 534         } else
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "No bus mastering arbitration control\n"));
 537
 538         /*
 539          * Evalute the processor object.  Note that it is common on SMP to
 540          * have the first (boot) processor with a valid PBLK address while
 541          * all others have a NULL address.
 542          */
 543         status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 544         if (ACPI_FAILURE(status)) {
 545                 printk(KERN_ERR PREFIX "Evaluating processor object\n");
 546                 return -ENODEV;
 547         }
 548
 549         /*
 550          * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 551          *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 552          */
 553         pr->acpi_id = object.processor.proc_id;
 554
 555         cpu_index = get_apic_id(pr->handle, pr->acpi_id);
 556
 557         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 558         if (!cpu0_initialized && (cpu_index == -1) &&
 559             (num_online_cpus() == 1)) {
 560                 cpu_index = 0;
 561         }
 562
 563         cpu0_initialized = 1;
 564
 565         pr->id = cpu_index;
 566
 567         /*
 568          *  Extra Processor objects may be enumerated on MP systems with
 569          *  less than the max # of CPUs. They should be ignored _iff
 570          *  they are physically not present.
 571          */
 572         if (pr->id == -1) {
 573                 if (ACPI_FAILURE
 574                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 575                         return -ENODEV;
 576                 }
 577         }
 578
 579         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 580                           pr->acpi_id));
 581
 582         if (!object.processor.pblk_address)
 583                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 584         else if (object.processor.pblk_length != 6)
 585                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 586                             object.processor.pblk_length);
 587         else {
 588                 pr->throttling.address = object.processor.pblk_address;
 589                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 590                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 591
 592                 pr->pblk = object.processor.pblk_address;
 593
 594                 /*
 595                  * We don't care about error returns - we just try to mark
 596                  * these reserved so that nobody else is confused into thinking
 597                  * that this region might be unused..
 598                  *
 599                  * (In particular, allocating the IO range for Cardbus)
 600                  */
 601                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 602         }
 603
 604 #ifdef CONFIG_CPU_FREQ
 605         acpi_processor_ppc_has_changed(pr);
 606 #endif
 607         acpi_processor_get_throttling_info(pr);
 608         acpi_processor_get_limit_info(pr);
 609
 610         return 0;
 611 }
 612
 613 static void *processor_device_array[NR_CPUS];
 614
 615 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 616 {
 617         int result = 0;
 618         acpi_status status = AE_OK;
 619         struct acpi_processor *pr;
 620
 621
 622         pr = acpi_driver_data(device);
 623
 624         result = acpi_processor_get_info(pr);
 625         if (result) {
 626                 /* Processor is physically not present */
 627                 return 0;
 628         }
 629
 630         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 631
 632         /*
 633          * Buggy BIOS check
 634          * ACPI id of processors can be reported wrongly by the BIOS.
 635          * Don't trust it blindly
 636          */
 637         if (processor_device_array[pr->id] != NULL &&
 638             processor_device_array[pr->id] != device) {
 639                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 640                         "for the processor\n");
 641                 return -ENODEV;
 642         }
 643         processor_device_array[pr->id] = device;
 644
 645         processors[pr->id] = pr;
 646
 647         result = acpi_processor_add_fs(device);
 648         if (result)
 649                 goto end;
 650
 651         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 652                                              acpi_processor_notify, pr);
 653
 654         /* _PDC call should be done before doing anything else (if reqd.). */
 655         arch_acpi_processor_init_pdc(pr);
 656         acpi_processor_set_pdc(pr);
 657
 658         acpi_processor_power_init(pr, device);
 659
 660         if (pr->flags.throttling) {
 661                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 662                        acpi_device_name(device), acpi_device_bid(device));
 663                 printk(" %d throttling states", pr->throttling.state_count);
 664                 printk(")\n");
 665         }
 666
 667       end:
 668
 669         return result;
 670 }
 671
 672 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 673 {
 674         struct acpi_processor *pr = data;
 675         struct acpi_device *device = NULL;
 676
 677
 678         if (!pr)
 679                 return;
 680
 681         if (acpi_bus_get_device(pr->handle, &device))
 682                 return;
 683
 684         switch (event) {
 685         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 686                 acpi_processor_ppc_has_changed(pr);
 687                 acpi_bus_generate_event(device, event,
 688                                         pr->performance_platform_limit);
 689                 break;
 690         case ACPI_PROCESSOR_NOTIFY_POWER:
 691                 acpi_processor_cst_has_changed(pr);
 692                 acpi_bus_generate_event(device, event, 0);
 693                 break;
 694         default:
 695                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 696                                   "Unsupported event [0x%x]\n", event));
 697                 break;
 698         }
 699
 700         return;
 701 }
 702
 703 static int acpi_processor_add(struct acpi_device *device)
 704 {
 705         struct acpi_processor *pr = NULL;
 706
 707
 708         if (!device)
 709                 return -EINVAL;
 710
 711         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 712         if (!pr)
 713                 return -ENOMEM;
 714
 715         pr->handle = device->handle;
 716         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 717         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 718         acpi_driver_data(device) = pr;
 719
 720         return 0;
 721 }
 722
 723 static int acpi_processor_remove(struct acpi_device *device, int type)
 724 {
 725         acpi_status status = AE_OK;
 726         struct acpi_processor *pr = NULL;
 727
 728
 729         if (!device || !acpi_driver_data(device))
 730                 return -EINVAL;
 731
 732         pr = acpi_driver_data(device);
 733
 734         if (pr->id >= NR_CPUS) {
 735                 kfree(pr);
 736                 return 0;
 737         }
 738
 739         if (type == ACPI_BUS_REMOVAL_EJECT) {
 740                 if (acpi_processor_handle_eject(pr))
 741                         return -EINVAL;
 742         }
 743
 744         acpi_processor_power_exit(pr, device);
 745
 746         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 747                                             acpi_processor_notify);
 748
 749         acpi_processor_remove_fs(device);
 750
 751         processors[pr->id] = NULL;
 752
 753         kfree(pr);
 754
 755         return 0;
 756 }
 757
 758 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 759 /****************************************************************************
 760  *      Acpi processor hotplug support                                      *
 761  ****************************************************************************/
 762
 763 static int is_processor_present(acpi_handle handle);
 764
 765 static int is_processor_present(acpi_handle handle)
 766 {
 767         acpi_status status;
 768         unsigned long sta = 0;
 769
 770
 771         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 772         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 773                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 774                 return 0;
 775         }
 776         return 1;
 777 }
 778
 779 static
 780 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 781 {
 782         acpi_handle phandle;
 783         struct acpi_device *pdev;
 784         struct acpi_processor *pr;
 785
 786
 787         if (acpi_get_parent(handle, &phandle)) {
 788                 return -ENODEV;
 789         }
 790
 791         if (acpi_bus_get_device(phandle, &pdev)) {
 792                 return -ENODEV;
 793         }
 794
 795         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 796                 return -ENODEV;
 797         }
 798
 799         acpi_bus_start(*device);
 800
 801         pr = acpi_driver_data(*device);
 802         if (!pr)
 803                 return -ENODEV;
 804
 805         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 806                 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
 807         }
 808         return 0;
 809 }
 810
 811 static void
 812 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 813 {
 814         struct acpi_processor *pr;
 815         struct acpi_device *device = NULL;
 816         int result;
 817
 818
 819         switch (event) {
 820         case ACPI_NOTIFY_BUS_CHECK:
 821         case ACPI_NOTIFY_DEVICE_CHECK:
 822                 printk("Processor driver received %s event\n",
 823                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 824                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 825
 826                 if (!is_processor_present(handle))
 827                         break;
 828
 829                 if (acpi_bus_get_device(handle, &device)) {
 830                         result = acpi_processor_device_add(handle, &device);
 831                         if (result)
 832                                 printk(KERN_ERR PREFIX
 833                                             "Unable to add the device\n");
 834                         break;
 835                 }
 836
 837                 pr = acpi_driver_data(device);
 838                 if (!pr) {
 839                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 840                         break;
 841                 }
 842
 843                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 844                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 845                         break;
 846                 }
 847
 848                 result = acpi_processor_start(device);
 849                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 850                         kobject_uevent(&device->kobj, KOBJ_ONLINE);
 851                 } else {
 852                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 853                                     acpi_device_bid(device));
 854                 }
 855                 break;
 856         case ACPI_NOTIFY_EJECT_REQUEST:
 857                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 858                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 859
 860                 if (acpi_bus_get_device(handle, &device)) {
 861                         printk(KERN_ERR PREFIX
 862                                     "Device don't exist, dropping EJECT\n");
 863                         break;
 864                 }
 865                 pr = acpi_driver_data(device);
 866                 if (!pr) {
 867                         printk(KERN_ERR PREFIX
 868                                     "Driver data is NULL, dropping EJECT\n");
 869                         return;
 870                 }
 871
 872                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 873                         kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 874                 break;
 875         default:
 876                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 877                                   "Unsupported event [0x%x]\n", event));
 878                 break;
 879         }
 880
 881         return;
 882 }
 883
 884 static acpi_status
 885 processor_walk_namespace_cb(acpi_handle handle,
 886                             u32 lvl, void *context, void **rv)
 887 {
 888         acpi_status status;
 889         int *action = context;
 890         acpi_object_type type = 0;
 891
 892         status = acpi_get_type(handle, &type);
 893         if (ACPI_FAILURE(status))
 894                 return (AE_OK);
 895
 896         if (type != ACPI_TYPE_PROCESSOR)
 897                 return (AE_OK);
 898
 899         switch (*action) {
 900         case INSTALL_NOTIFY_HANDLER:
 901                 acpi_install_notify_handler(handle,
 902                                             ACPI_SYSTEM_NOTIFY,
 903                                             acpi_processor_hotplug_notify,
 904                                             NULL);
 905                 break;
 906         case UNINSTALL_NOTIFY_HANDLER:
 907                 acpi_remove_notify_handler(handle,
 908                                            ACPI_SYSTEM_NOTIFY,
 909                                            acpi_processor_hotplug_notify);
 910                 break;
 911         default:
 912                 break;
 913         }
 914
 915         return (AE_OK);
 916 }
 917
 918 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 919 {
 920
 921         if (!is_processor_present(handle)) {
 922                 return AE_ERROR;
 923         }
 924
 925         if (acpi_map_lsapic(handle, p_cpu))
 926                 return AE_ERROR;
 927
 928         if (arch_register_cpu(*p_cpu)) {
 929                 acpi_unmap_lsapic(*p_cpu);
 930                 return AE_ERROR;
 931         }
 932
 933         return AE_OK;
 934 }
 935
 936 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 937 {
 938         if (cpu_online(pr->id)) {
 939                 return (-EINVAL);
 940         }
 941         arch_unregister_cpu(pr->id);
 942         acpi_unmap_lsapic(pr->id);
 943         return (0);
 944 }
 945 #else
 946 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 947 {
 948         return AE_ERROR;
 949 }
 950 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 951 {
 952         return (-EINVAL);
 953 }
 954 #endif
 955
 956 static
 957 void acpi_processor_install_hotplug_notify(void)
 958 {
 959 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 960         int action = INSTALL_NOTIFY_HANDLER;
 961         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 962                             ACPI_ROOT_OBJECT,
 963                             ACPI_UINT32_MAX,
 964                             processor_walk_namespace_cb, &action, NULL);
 965 #endif
 966 }
 967
 968 static
 969 void acpi_processor_uninstall_hotplug_notify(void)
 970 {
 971 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 972         int action = UNINSTALL_NOTIFY_HANDLER;
 973         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 974                             ACPI_ROOT_OBJECT,
 975                             ACPI_UINT32_MAX,
 976                             processor_walk_namespace_cb, &action, NULL);
 977 #endif
 978 }
 979
 980 /*
 981  * We keep the driver loaded even when ACPI is not running.
 982  * This is needed for the powernow-k8 driver, that works even without
 983  * ACPI, but needs symbols from this driver
 984  */
 985
 986 static int __init acpi_processor_init(void)
 987 {
 988         int result = 0;
 989
 990
 991         memset(&processors, 0, sizeof(processors));
 992         memset(&errata, 0, sizeof(errata));
 993
 994 #ifdef CONFIG_SMP
 995         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
 996                                 (struct acpi_table_header **)&madt)))
 997                 madt = 0;
 998 #endif
 999
1000         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1001         if (!acpi_processor_dir)
1002                 return -ENOMEM;
1003         acpi_processor_dir->owner = THIS_MODULE;
1004
1005         result = acpi_bus_register_driver(&acpi_processor_driver);
1006         if (result < 0) {
1007                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1008                 return result;
1009         }
1010
1011         acpi_processor_install_hotplug_notify();
1012
1013         acpi_thermal_cpufreq_init();
1014
1015         acpi_processor_ppc_init();
1016
1017         return 0;
1018 }
1019
1020 static void __exit acpi_processor_exit(void)
1021 {
1022
1023         acpi_processor_ppc_exit();
1024
1025         acpi_thermal_cpufreq_exit();
1026
1027         acpi_processor_uninstall_hotplug_notify();
1028
1029         acpi_bus_unregister_driver(&acpi_processor_driver);
1030
1031         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1032
1033         return;
1034 }
1035
1036 module_init(acpi_processor_init);
1037 module_exit(acpi_processor_exit);
1038
1039 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1040
1041 MODULE_ALIAS("processor");