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   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 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define PREFIX "ACPI: "
  63
  64 #define ACPI_PROCESSOR_CLASS            "processor"
  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 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  72
  73 #define ACPI_PROCESSOR_LIMIT_USER       0
  74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("processor_core");
  78
  79 MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION("ACPI Processor Driver");
  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(struct acpi_device *device, u32 event);
  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
  92 static const struct acpi_device_id processor_device_ids[] = {
  93         {ACPI_PROCESSOR_OBJECT_HID, 0},
  94         {"ACPI0007", 0},
  95         {"", 0},
  96 };
  97 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  98
  99 static struct acpi_driver acpi_processor_driver = {
 100         .name = "processor",
 101         .class = ACPI_PROCESSOR_CLASS,
 102         .ids = processor_device_ids,
 103         .ops = {
 104                 .add = acpi_processor_add,
 105                 .remove = acpi_processor_remove,
 106                 .start = acpi_processor_start,
 107                 .suspend = acpi_processor_suspend,
 108                 .resume = acpi_processor_resume,
 109                 .notify = acpi_processor_notify,
 110                 },
 111 };
 112
 113 #define INSTALL_NOTIFY_HANDLER          1
 114 #define UNINSTALL_NOTIFY_HANDLER        2
 115
 116 static const struct file_operations acpi_processor_info_fops = {
 117         .owner = THIS_MODULE,
 118         .open = acpi_processor_info_open_fs,
 119         .read = seq_read,
 120         .llseek = seq_lseek,
 121         .release = single_release,
 122 };
 123
 124 DEFINE_PER_CPU(struct acpi_processor *, processors);
 125 struct acpi_processor_errata errata __read_mostly;
 126 static int set_no_mwait(const struct dmi_system_id *id)
 127 {
 128         printk(KERN_NOTICE PREFIX "%s detected - "
 129                 "disabling mwait for CPU C-states\n", id->ident);
 130         idle_nomwait = 1;
 131         return 0;
 132 }
 133
 134 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 135         {
 136         set_no_mwait, "IFL91 board", {
 137         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 138         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 139         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 140         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 141         {
 142         set_no_mwait, "Extensa 5220", {
 143         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 144         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 145         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 146         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 147         {},
 148 };
 149
 150 /* --------------------------------------------------------------------------
 151                                 Errata Handling
 152    -------------------------------------------------------------------------- */
 153
 154 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 155 {
 156         u8 value1 = 0;
 157         u8 value2 = 0;
 158
 159
 160         if (!dev)
 161                 return -EINVAL;
 162
 163         /*
 164          * Note that 'dev' references the PIIX4 ACPI Controller.
 165          */
 166
 167         switch (dev->revision) {
 168         case 0:
 169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 170                 break;
 171         case 1:
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 173                 break;
 174         case 2:
 175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 176                 break;
 177         case 3:
 178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 179                 break;
 180         default:
 181                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 182                 break;
 183         }
 184
 185         switch (dev->revision) {
 186
 187         case 0:         /* PIIX4 A-step */
 188         case 1:         /* PIIX4 B-step */
 189                 /*
 190                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 191                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 192                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 193                  * 2002 PIIX4 specification update.  Applies to only older
 194                  * PIIX4 models.
 195                  */
 196                 errata.piix4.throttle = 1;
 197
 198         case 2:         /* PIIX4E */
 199         case 3:         /* PIIX4M */
 200                 /*
 201                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 202                  * Livelock") from the January 2002 PIIX4 specification update.
 203                  * Applies to all PIIX4 models.
 204                  */
 205
 206                 /*
 207                  * BM-IDE
 208                  * ------
 209                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 210                  * Status register address.  We'll use this later to read
 211                  * each IDE controller's DMA status to make sure we catch all
 212                  * DMA activity.
 213                  */
 214                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 215                                      PCI_DEVICE_ID_INTEL_82371AB,
 216                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 217                 if (dev) {
 218                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 219                         pci_dev_put(dev);
 220                 }
 221
 222                 /*
 223                  * Type-F DMA
 224                  * ----------
 225                  * Find the PIIX4 ISA Controller and read the Motherboard
 226                  * DMA controller's status to see if Type-F (Fast) DMA mode
 227                  * is enabled (bit 7) on either channel.  Note that we'll
 228                  * disable C3 support if this is enabled, as some legacy
 229                  * devices won't operate well if fast DMA is disabled.
 230                  */
 231                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 232                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 233                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 234                 if (dev) {
 235                         pci_read_config_byte(dev, 0x76, &value1);
 236                         pci_read_config_byte(dev, 0x77, &value2);
 237                         if ((value1 & 0x80) || (value2 & 0x80))
 238                                 errata.piix4.fdma = 1;
 239                         pci_dev_put(dev);
 240                 }
 241
 242                 break;
 243         }
 244
 245         if (errata.piix4.bmisx)
 246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 247                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 248         if (errata.piix4.fdma)
 249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 250                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 251
 252         return 0;
 253 }
 254
 255 static int acpi_processor_errata(struct acpi_processor *pr)
 256 {
 257         int result = 0;
 258         struct pci_dev *dev = NULL;
 259
 260
 261         if (!pr)
 262                 return -EINVAL;
 263
 264         /*
 265          * PIIX4
 266          */
 267         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 268                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 269                              PCI_ANY_ID, NULL);
 270         if (dev) {
 271                 result = acpi_processor_errata_piix4(dev);
 272                 pci_dev_put(dev);
 273         }
 274
 275         return result;
 276 }
 277
 278 /* --------------------------------------------------------------------------
 279                               Common ACPI processor functions
 280    -------------------------------------------------------------------------- */
 281
 282 /*
 283  * _PDC is required for a BIOS-OS handshake for most of the newer
 284  * ACPI processor features.
 285  */
 286 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 287 {
 288         struct acpi_object_list *pdc_in = pr->pdc;
 289         acpi_status status = AE_OK;
 290
 291
 292         if (!pdc_in)
 293                 return status;
 294         if (idle_nomwait) {
 295                 /*
 296                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 297                  * mode will be disabled in the parameter of _PDC object.
 298                  * Of course C1_FFH access mode will also be disabled.
 299                  */
 300                 union acpi_object *obj;
 301                 u32 *buffer = NULL;
 302
 303                 obj = pdc_in->pointer;
 304                 buffer = (u32 *)(obj->buffer.pointer);
 305                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 306
 307         }
 308         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 309
 310         if (ACPI_FAILURE(status))
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 312                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 313
 314         return status;
 315 }
 316
 317 /* --------------------------------------------------------------------------
 318                               FS Interface (/proc)
 319    -------------------------------------------------------------------------- */
 320
 321 static struct proc_dir_entry *acpi_processor_dir = NULL;
 322
 323 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 324 {
 325         struct acpi_processor *pr = seq->private;
 326
 327
 328         if (!pr)
 329                 goto end;
 330
 331         seq_printf(seq, "processor id:            %d\n"
 332                    "acpi id:                 %d\n"
 333                    "bus mastering control:   %s\n"
 334                    "power management:        %s\n"
 335                    "throttling control:      %s\n"
 336                    "limit interface:         %s\n",
 337                    pr->id,
 338                    pr->acpi_id,
 339                    pr->flags.bm_control ? "yes" : "no",
 340                    pr->flags.power ? "yes" : "no",
 341                    pr->flags.throttling ? "yes" : "no",
 342                    pr->flags.limit ? "yes" : "no");
 343
 344       end:
 345         return 0;
 346 }
 347
 348 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 349 {
 350         return single_open(file, acpi_processor_info_seq_show,
 351                            PDE(inode)->data);
 352 }
 353
 354 static int acpi_processor_add_fs(struct acpi_device *device)
 355 {
 356         struct proc_dir_entry *entry = NULL;
 357
 358
 359         if (!acpi_device_dir(device)) {
 360                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 361                                                      acpi_processor_dir);
 362                 if (!acpi_device_dir(device))
 363                         return -ENODEV;
 364         }
 365
 366         /* 'info' [R] */
 367         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 368                                  S_IRUGO, acpi_device_dir(device),
 369                                  &acpi_processor_info_fops,
 370                                  acpi_driver_data(device));
 371         if (!entry)
 372                 return -EIO;
 373
 374         /* 'throttling' [R/W] */
 375         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 376                                  S_IFREG | S_IRUGO | S_IWUSR,
 377                                  acpi_device_dir(device),
 378                                  &acpi_processor_throttling_fops,
 379                                  acpi_driver_data(device));
 380         if (!entry)
 381                 return -EIO;
 382
 383         /* 'limit' [R/W] */
 384         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 385                                  S_IFREG | S_IRUGO | S_IWUSR,
 386                                  acpi_device_dir(device),
 387                                  &acpi_processor_limit_fops,
 388                                  acpi_driver_data(device));
 389         if (!entry)
 390                 return -EIO;
 391         return 0;
 392 }
 393
 394 static int acpi_processor_remove_fs(struct acpi_device *device)
 395 {
 396
 397         if (acpi_device_dir(device)) {
 398                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 399                                   acpi_device_dir(device));
 400                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 401                                   acpi_device_dir(device));
 402                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 403                                   acpi_device_dir(device));
 404                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 405                 acpi_device_dir(device) = NULL;
 406         }
 407
 408         return 0;
 409 }
 410
 411 /* Use the acpiid in MADT to map cpus in case of SMP */
 412
 413 #ifndef CONFIG_SMP
 414 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 415 #else
 416
 417 static struct acpi_table_madt *madt;
 418
 419 static int map_lapic_id(struct acpi_subtable_header *entry,
 420                  u32 acpi_id, int *apic_id)
 421 {
 422         struct acpi_madt_local_apic *lapic =
 423                 (struct acpi_madt_local_apic *)entry;
 424         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 425             lapic->processor_id == acpi_id) {
 426                 *apic_id = lapic->id;
 427                 return 1;
 428         }
 429         return 0;
 430 }
 431
 432 static int map_x2apic_id(struct acpi_subtable_header *entry,
 433                          int device_declaration, u32 acpi_id, int *apic_id)
 434 {
 435         struct acpi_madt_local_x2apic *apic =
 436                 (struct acpi_madt_local_x2apic *)entry;
 437         u32 tmp = apic->local_apic_id;
 438
 439         /* Only check enabled APICs*/
 440         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 441                 return 0;
 442
 443         /* Device statement declaration type */
 444         if (device_declaration) {
 445                 if (apic->uid == acpi_id)
 446                         goto found;
 447         }
 448
 449         return 0;
 450 found:
 451         *apic_id = tmp;
 452         return 1;
 453 }
 454
 455 static int map_lsapic_id(struct acpi_subtable_header *entry,
 456                 int device_declaration, u32 acpi_id, int *apic_id)
 457 {
 458         struct acpi_madt_local_sapic *lsapic =
 459                 (struct acpi_madt_local_sapic *)entry;
 460         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 461
 462         /* Only check enabled APICs*/
 463         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 464                 return 0;
 465
 466         /* Device statement declaration type */
 467         if (device_declaration) {
 468                 if (entry->length < 16)
 469                         printk(KERN_ERR PREFIX
 470                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 471                             tmp);
 472                 else if (lsapic->uid == acpi_id)
 473                         goto found;
 474         /* Processor statement declaration type */
 475         } else if (lsapic->processor_id == acpi_id)
 476                 goto found;
 477
 478         return 0;
 479 found:
 480         *apic_id = tmp;
 481         return 1;
 482 }
 483
 484 static int map_madt_entry(int type, u32 acpi_id)
 485 {
 486         unsigned long madt_end, entry;
 487         int apic_id = -1;
 488
 489         if (!madt)
 490                 return apic_id;
 491
 492         entry = (unsigned long)madt;
 493         madt_end = entry + madt->header.length;
 494
 495         /* Parse all entries looking for a match. */
 496
 497         entry += sizeof(struct acpi_table_madt);
 498         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 499                 struct acpi_subtable_header *header =
 500                         (struct acpi_subtable_header *)entry;
 501                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 502                         if (map_lapic_id(header, acpi_id, &apic_id))
 503                                 break;
 504                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 505                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 506                                 break;
 507                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 508                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 509                                 break;
 510                 }
 511                 entry += header->length;
 512         }
 513         return apic_id;
 514 }
 515
 516 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 517 {
 518         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 519         union acpi_object *obj;
 520         struct acpi_subtable_header *header;
 521         int apic_id = -1;
 522
 523         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 524                 goto exit;
 525
 526         if (!buffer.length || !buffer.pointer)
 527                 goto exit;
 528
 529         obj = buffer.pointer;
 530         if (obj->type != ACPI_TYPE_BUFFER ||
 531             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 532                 goto exit;
 533         }
 534
 535         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 536         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 537                 map_lapic_id(header, acpi_id, &apic_id);
 538         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 539                 map_lsapic_id(header, type, acpi_id, &apic_id);
 540         }
 541
 542 exit:
 543         if (buffer.pointer)
 544                 kfree(buffer.pointer);
 545         return apic_id;
 546 }
 547
 548 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 549 {
 550         int i;
 551         int apic_id = -1;
 552
 553         apic_id = map_mat_entry(handle, type, acpi_id);
 554         if (apic_id == -1)
 555                 apic_id = map_madt_entry(type, acpi_id);
 556         if (apic_id == -1)
 557                 return apic_id;
 558
 559         for_each_possible_cpu(i) {
 560                 if (cpu_physical_id(i) == apic_id)
 561                         return i;
 562         }
 563         return -1;
 564 }
 565 #endif
 566
 567 /* --------------------------------------------------------------------------
 568                                  Driver Interface
 569    -------------------------------------------------------------------------- */
 570
 571 static int acpi_processor_get_info(struct acpi_device *device)
 572 {
 573         acpi_status status = 0;
 574         union acpi_object object = { 0 };
 575         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 576         struct acpi_processor *pr;
 577         int cpu_index, device_declaration = 0;
 578         static int cpu0_initialized;
 579
 580         pr = acpi_driver_data(device);
 581         if (!pr)
 582                 return -EINVAL;
 583
 584         if (num_online_cpus() > 1)
 585                 errata.smp = TRUE;
 586
 587         acpi_processor_errata(pr);
 588
 589         /*
 590          * Check to see if we have bus mastering arbitration control.  This
 591          * is required for proper C3 usage (to maintain cache coherency).
 592          */
 593         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 594                 pr->flags.bm_control = 1;
 595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 596                                   "Bus mastering arbitration control present\n"));
 597         } else
 598                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 599                                   "No bus mastering arbitration control\n"));
 600
 601         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 602                 /* Declared with "Processor" statement; match ProcessorID */
 603                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 604                 if (ACPI_FAILURE(status)) {
 605                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 606                         return -ENODEV;
 607                 }
 608
 609                 /*
 610                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 611                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 612                  *      arch/xxx/acpi.c
 613                  */
 614                 pr->acpi_id = object.processor.proc_id;
 615         } else {
 616                 /*
 617                  * Declared with "Device" statement; match _UID.
 618                  * Note that we don't handle string _UIDs yet.
 619                  */
 620                 unsigned long long value;
 621                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 622                                                 NULL, &value);
 623                 if (ACPI_FAILURE(status)) {
 624                         printk(KERN_ERR PREFIX
 625                             "Evaluating processor _UID [%#x]\n", status);
 626                         return -ENODEV;
 627                 }
 628                 device_declaration = 1;
 629                 pr->acpi_id = value;
 630         }
 631         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 632
 633         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 634         if (!cpu0_initialized && (cpu_index == -1) &&
 635             (num_online_cpus() == 1)) {
 636                 cpu_index = 0;
 637         }
 638
 639         cpu0_initialized = 1;
 640
 641         pr->id = cpu_index;
 642
 643         /*
 644          *  Extra Processor objects may be enumerated on MP systems with
 645          *  less than the max # of CPUs. They should be ignored _iff
 646          *  they are physically not present.
 647          */
 648         if (pr->id == -1) {
 649                 if (ACPI_FAILURE
 650                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 651                         return -ENODEV;
 652                 }
 653         }
 654         /*
 655          * On some boxes several processors use the same processor bus id.
 656          * But they are located in different scope. For example:
 657          * \_SB.SCK0.CPU0
 658          * \_SB.SCK1.CPU0
 659          * Rename the processor device bus id. And the new bus id will be
 660          * generated as the following format:
 661          * CPU+CPU ID.
 662          */
 663         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 664         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 665                           pr->acpi_id));
 666
 667         if (!object.processor.pblk_address)
 668                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 669         else if (object.processor.pblk_length != 6)
 670                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 671                             object.processor.pblk_length);
 672         else {
 673                 pr->throttling.address = object.processor.pblk_address;
 674                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 675                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 676
 677                 pr->pblk = object.processor.pblk_address;
 678
 679                 /*
 680                  * We don't care about error returns - we just try to mark
 681                  * these reserved so that nobody else is confused into thinking
 682                  * that this region might be unused..
 683                  *
 684                  * (In particular, allocating the IO range for Cardbus)
 685                  */
 686                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 687         }
 688
 689         /*
 690          * If ACPI describes a slot number for this CPU, we can use it
 691          * ensure we get the right value in the "physical id" field
 692          * of /proc/cpuinfo
 693          */
 694         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 695         if (ACPI_SUCCESS(status))
 696                 arch_fix_phys_package_id(pr->id, object.integer.value);
 697
 698         return 0;
 699 }
 700
 701 static DEFINE_PER_CPU(void *, processor_device_array);
 702
 703 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 704 {
 705         int result = 0;
 706         struct acpi_processor *pr;
 707         struct sys_device *sysdev;
 708
 709         pr = acpi_driver_data(device);
 710
 711         result = acpi_processor_get_info(device);
 712         if (result) {
 713                 /* Processor is physically not present */
 714                 return 0;
 715         }
 716
 717         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 718
 719         /*
 720          * Buggy BIOS check
 721          * ACPI id of processors can be reported wrongly by the BIOS.
 722          * Don't trust it blindly
 723          */
 724         if (per_cpu(processor_device_array, pr->id) != NULL &&
 725             per_cpu(processor_device_array, pr->id) != device) {
 726                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 727                         "for the processor\n");
 728                 return -ENODEV;
 729         }
 730         per_cpu(processor_device_array, pr->id) = device;
 731
 732         per_cpu(processors, pr->id) = pr;
 733
 734         result = acpi_processor_add_fs(device);
 735         if (result)
 736                 goto end;
 737
 738         sysdev = get_cpu_sysdev(pr->id);
 739         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 740                 return -EFAULT;
 741
 742         /* _PDC call should be done before doing anything else (if reqd.). */
 743         arch_acpi_processor_init_pdc(pr);
 744         acpi_processor_set_pdc(pr);
 745         arch_acpi_processor_cleanup_pdc(pr);
 746
 747 #ifdef CONFIG_CPU_FREQ
 748         acpi_processor_ppc_has_changed(pr);
 749 #endif
 750         acpi_processor_get_throttling_info(pr);
 751         acpi_processor_get_limit_info(pr);
 752
 753
 754         acpi_processor_power_init(pr, device);
 755
 756         pr->cdev = thermal_cooling_device_register("Processor", device,
 757                                                 &processor_cooling_ops);
 758         if (IS_ERR(pr->cdev)) {
 759                 result = PTR_ERR(pr->cdev);
 760                 goto end;
 761         }
 762
 763         dev_info(&device->dev, "registered as cooling_device%d\n",
 764                  pr->cdev->id);
 765
 766         result = sysfs_create_link(&device->dev.kobj,
 767                                    &pr->cdev->device.kobj,
 768                                    "thermal_cooling");
 769         if (result)
 770                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 771         result = sysfs_create_link(&pr->cdev->device.kobj,
 772                                    &device->dev.kobj,
 773                                    "device");
 774         if (result)
 775                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 776
 777         if (pr->flags.throttling) {
 778                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 779                        acpi_device_name(device), acpi_device_bid(device));
 780                 printk(" %d throttling states", pr->throttling.state_count);
 781                 printk(")\n");
 782         }
 783
 784       end:
 785
 786         return result;
 787 }
 788
 789 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 790 {
 791         struct acpi_processor *pr = acpi_driver_data(device);
 792         int saved;
 793
 794         if (!pr)
 795                 return;
 796
 797         switch (event) {
 798         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 799                 saved = pr->performance_platform_limit;
 800                 acpi_processor_ppc_has_changed(pr);
 801                 if (saved == pr->performance_platform_limit)
 802                         break;
 803                 acpi_bus_generate_proc_event(device, event,
 804                                         pr->performance_platform_limit);
 805                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 806                                                   dev_name(&device->dev), event,
 807                                                   pr->performance_platform_limit);
 808                 break;
 809         case ACPI_PROCESSOR_NOTIFY_POWER:
 810                 acpi_processor_cst_has_changed(pr);
 811                 acpi_bus_generate_proc_event(device, event, 0);
 812                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 813                                                   dev_name(&device->dev), event, 0);
 814                 break;
 815         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 816                 acpi_processor_tstate_has_changed(pr);
 817                 acpi_bus_generate_proc_event(device, event, 0);
 818                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 819                                                   dev_name(&device->dev), event, 0);
 820         default:
 821                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 822                                   "Unsupported event [0x%x]\n", event));
 823                 break;
 824         }
 825
 826         return;
 827 }
 828
 829 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 830                 unsigned long action, void *hcpu)
 831 {
 832         unsigned int cpu = (unsigned long)hcpu;
 833         struct acpi_processor *pr = per_cpu(processors, cpu);
 834
 835         if (action == CPU_ONLINE && pr) {
 836                 acpi_processor_ppc_has_changed(pr);
 837                 acpi_processor_cst_has_changed(pr);
 838                 acpi_processor_tstate_has_changed(pr);
 839         }
 840         return NOTIFY_OK;
 841 }
 842
 843 static struct notifier_block acpi_cpu_notifier =
 844 {
 845             .notifier_call = acpi_cpu_soft_notify,
 846 };
 847
 848 static int acpi_processor_add(struct acpi_device *device)
 849 {
 850         struct acpi_processor *pr = NULL;
 851
 852
 853         if (!device)
 854                 return -EINVAL;
 855
 856         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 857         if (!pr)
 858                 return -ENOMEM;
 859
 860         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 861                 kfree(pr);
 862                 return -ENOMEM;
 863         }
 864
 865         pr->handle = device->handle;
 866         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 867         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 868         device->driver_data = pr;
 869
 870         return 0;
 871 }
 872
 873 static int acpi_processor_remove(struct acpi_device *device, int type)
 874 {
 875         struct acpi_processor *pr = NULL;
 876
 877
 878         if (!device || !acpi_driver_data(device))
 879                 return -EINVAL;
 880
 881         pr = acpi_driver_data(device);
 882
 883         if (pr->id >= nr_cpu_ids)
 884                 goto free;
 885
 886         if (type == ACPI_BUS_REMOVAL_EJECT) {
 887                 if (acpi_processor_handle_eject(pr))
 888                         return -EINVAL;
 889         }
 890
 891         acpi_processor_power_exit(pr, device);
 892
 893         sysfs_remove_link(&device->dev.kobj, "sysdev");
 894
 895         acpi_processor_remove_fs(device);
 896
 897         if (pr->cdev) {
 898                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 899                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 900                 thermal_cooling_device_unregister(pr->cdev);
 901                 pr->cdev = NULL;
 902         }
 903
 904         per_cpu(processors, pr->id) = NULL;
 905         per_cpu(processor_device_array, pr->id) = NULL;
 906
 907 free:
 908         free_cpumask_var(pr->throttling.shared_cpu_map);
 909         kfree(pr);
 910
 911         return 0;
 912 }
 913
 914 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 915 /****************************************************************************
 916  *      Acpi processor hotplug support                                      *
 917  ****************************************************************************/
 918
 919 static int is_processor_present(acpi_handle handle)
 920 {
 921         acpi_status status;
 922         unsigned long long sta = 0;
 923
 924
 925         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 926
 927         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 928                 return 1;
 929
 930         /*
 931          * _STA is mandatory for a processor that supports hot plug
 932          */
 933         if (status == AE_NOT_FOUND)
 934                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 935                                 "Processor does not support hot plug\n"));
 936         else
 937                 ACPI_EXCEPTION((AE_INFO, status,
 938                                 "Processor Device is not present"));
 939         return 0;
 940 }
 941
 942 static
 943 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 944 {
 945         acpi_handle phandle;
 946         struct acpi_device *pdev;
 947         struct acpi_processor *pr;
 948
 949
 950         if (acpi_get_parent(handle, &phandle)) {
 951                 return -ENODEV;
 952         }
 953
 954         if (acpi_bus_get_device(phandle, &pdev)) {
 955                 return -ENODEV;
 956         }
 957
 958         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 959                 return -ENODEV;
 960         }
 961
 962         acpi_bus_start(*device);
 963
 964         pr = acpi_driver_data(*device);
 965         if (!pr)
 966                 return -ENODEV;
 967
 968         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 969                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 970         }
 971         return 0;
 972 }
 973
 974 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 975                                                 u32 event, void *data)
 976 {
 977         struct acpi_processor *pr;
 978         struct acpi_device *device = NULL;
 979         int result;
 980
 981
 982         switch (event) {
 983         case ACPI_NOTIFY_BUS_CHECK:
 984         case ACPI_NOTIFY_DEVICE_CHECK:
 985                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 986                 "Processor driver received %s event\n",
 987                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 988                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 989
 990                 if (!is_processor_present(handle))
 991                         break;
 992
 993                 if (acpi_bus_get_device(handle, &device)) {
 994                         result = acpi_processor_device_add(handle, &device);
 995                         if (result)
 996                                 printk(KERN_ERR PREFIX
 997                                             "Unable to add the device\n");
 998                         break;
 999                 }
1000
1001                 pr = acpi_driver_data(device);
1002                 if (!pr) {
1003                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
1004                         break;
1005                 }
1006
1007                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
1008                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1009                         break;
1010                 }
1011
1012                 result = acpi_processor_start(device);
1013                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
1014                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
1015                 } else {
1016                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
1017                                     acpi_device_bid(device));
1018                 }
1019                 break;
1020         case ACPI_NOTIFY_EJECT_REQUEST:
1021                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1022                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1023
1024                 if (acpi_bus_get_device(handle, &device)) {
1025                         printk(KERN_ERR PREFIX
1026                                     "Device don't exist, dropping EJECT\n");
1027                         break;
1028                 }
1029                 pr = acpi_driver_data(device);
1030                 if (!pr) {
1031                         printk(KERN_ERR PREFIX
1032                                     "Driver data is NULL, dropping EJECT\n");
1033                         return;
1034                 }
1035
1036                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1037                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1038                 break;
1039         default:
1040                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1041                                   "Unsupported event [0x%x]\n", event));
1042                 break;
1043         }
1044
1045         return;
1046 }
1047
1048 static acpi_status
1049 processor_walk_namespace_cb(acpi_handle handle,
1050                             u32 lvl, void *context, void **rv)
1051 {
1052         acpi_status status;
1053         int *action = context;
1054         acpi_object_type type = 0;
1055
1056         status = acpi_get_type(handle, &type);
1057         if (ACPI_FAILURE(status))
1058                 return (AE_OK);
1059
1060         if (type != ACPI_TYPE_PROCESSOR)
1061                 return (AE_OK);
1062
1063         switch (*action) {
1064         case INSTALL_NOTIFY_HANDLER:
1065                 acpi_install_notify_handler(handle,
1066                                             ACPI_SYSTEM_NOTIFY,
1067                                             acpi_processor_hotplug_notify,
1068                                             NULL);
1069                 break;
1070         case UNINSTALL_NOTIFY_HANDLER:
1071                 acpi_remove_notify_handler(handle,
1072                                            ACPI_SYSTEM_NOTIFY,
1073                                            acpi_processor_hotplug_notify);
1074                 break;
1075         default:
1076                 break;
1077         }
1078
1079         return (AE_OK);
1080 }
1081
1082 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1083 {
1084
1085         if (!is_processor_present(handle)) {
1086                 return AE_ERROR;
1087         }
1088
1089         if (acpi_map_lsapic(handle, p_cpu))
1090                 return AE_ERROR;
1091
1092         if (arch_register_cpu(*p_cpu)) {
1093                 acpi_unmap_lsapic(*p_cpu);
1094                 return AE_ERROR;
1095         }
1096
1097         return AE_OK;
1098 }
1099
1100 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1101 {
1102         if (cpu_online(pr->id))
1103                 cpu_down(pr->id);
1104
1105         arch_unregister_cpu(pr->id);
1106         acpi_unmap_lsapic(pr->id);
1107         return (0);
1108 }
1109 #else
1110 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1111 {
1112         return AE_ERROR;
1113 }
1114 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1115 {
1116         return (-EINVAL);
1117 }
1118 #endif
1119
1120 static
1121 void acpi_processor_install_hotplug_notify(void)
1122 {
1123 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1124         int action = INSTALL_NOTIFY_HANDLER;
1125         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1126                             ACPI_ROOT_OBJECT,
1127                             ACPI_UINT32_MAX,
1128                             processor_walk_namespace_cb, &action, NULL);
1129 #endif
1130         register_hotcpu_notifier(&acpi_cpu_notifier);
1131 }
1132
1133 static
1134 void acpi_processor_uninstall_hotplug_notify(void)
1135 {
1136 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1137         int action = UNINSTALL_NOTIFY_HANDLER;
1138         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1139                             ACPI_ROOT_OBJECT,
1140                             ACPI_UINT32_MAX,
1141                             processor_walk_namespace_cb, &action, NULL);
1142 #endif
1143         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1144 }
1145
1146 /*
1147  * We keep the driver loaded even when ACPI is not running.
1148  * This is needed for the powernow-k8 driver, that works even without
1149  * ACPI, but needs symbols from this driver
1150  */
1151
1152 static int __init acpi_processor_init(void)
1153 {
1154         int result = 0;
1155
1156         if (acpi_disabled)
1157                 return 0;
1158
1159         memset(&errata, 0, sizeof(errata));
1160
1161 #ifdef CONFIG_SMP
1162         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1163                                 (struct acpi_table_header **)&madt)))
1164                 madt = NULL;
1165 #endif
1166
1167         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1168         if (!acpi_processor_dir)
1169                 return -ENOMEM;
1170
1171         /*
1172          * Check whether the system is DMI table. If yes, OSPM
1173          * should not use mwait for CPU-states.
1174          */
1175         dmi_check_system(processor_idle_dmi_table);
1176         result = cpuidle_register_driver(&acpi_idle_driver);
1177         if (result < 0)
1178                 goto out_proc;
1179
1180         result = acpi_bus_register_driver(&acpi_processor_driver);
1181         if (result < 0)
1182                 goto out_cpuidle;
1183
1184         acpi_processor_install_hotplug_notify();
1185
1186         acpi_thermal_cpufreq_init();
1187
1188         acpi_processor_ppc_init();
1189
1190         acpi_processor_throttling_init();
1191
1192         return 0;
1193
1194 out_cpuidle:
1195         cpuidle_unregister_driver(&acpi_idle_driver);
1196
1197 out_proc:
1198         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1199
1200         return result;
1201 }
1202
1203 static void __exit acpi_processor_exit(void)
1204 {
1205         if (acpi_disabled)
1206                 return;
1207
1208         acpi_processor_ppc_exit();
1209
1210         acpi_thermal_cpufreq_exit();
1211
1212         acpi_processor_uninstall_hotplug_notify();
1213
1214         acpi_bus_unregister_driver(&acpi_processor_driver);
1215
1216         cpuidle_unregister_driver(&acpi_idle_driver);
1217
1218         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1219
1220         return;
1221 }
1222
1223 module_init(acpi_processor_init);
1224 module_exit(acpi_processor_exit);
1225
1226 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1227
1228 MODULE_ALIAS("processor");