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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 ACPI_PROCESSOR_CLASS            "processor"
  63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  64 #define ACPI_PROCESSOR_FILE_INFO        "info"
  65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  69 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  70
  71 #define ACPI_PROCESSOR_LIMIT_USER       0
  72 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  73
  74 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  75 ACPI_MODULE_NAME("processor_core");
  76
  77 MODULE_AUTHOR("Paul Diefenbaugh");
  78 MODULE_DESCRIPTION("ACPI Processor Driver");
  79 MODULE_LICENSE("GPL");
  80
  81 static int acpi_processor_add(struct acpi_device *device);
  82 static int acpi_processor_start(struct acpi_device *device);
  83 static int acpi_processor_remove(struct acpi_device *device, int type);
  84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  87 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  88
  89
  90 static const struct acpi_device_id processor_device_ids[] = {
  91         {ACPI_PROCESSOR_OBJECT_HID, 0},
  92         {ACPI_PROCESSOR_HID, 0},
  93         {"", 0},
  94 };
  95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  96
  97 static struct acpi_driver acpi_processor_driver = {
  98         .name = "processor",
  99         .class = ACPI_PROCESSOR_CLASS,
 100         .ids = processor_device_ids,
 101         .ops = {
 102                 .add = acpi_processor_add,
 103                 .remove = acpi_processor_remove,
 104                 .start = acpi_processor_start,
 105                 .suspend = acpi_processor_suspend,
 106                 .resume = acpi_processor_resume,
 107                 },
 108 };
 109
 110 #define INSTALL_NOTIFY_HANDLER          1
 111 #define UNINSTALL_NOTIFY_HANDLER        2
 112
 113 static const struct file_operations acpi_processor_info_fops = {
 114         .owner = THIS_MODULE,
 115         .open = acpi_processor_info_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 DEFINE_PER_CPU(struct acpi_processor *, processors);
 122 struct acpi_processor_errata errata __read_mostly;
 123 static int set_no_mwait(const struct dmi_system_id *id)
 124 {
 125         printk(KERN_NOTICE PREFIX "%s detected - "
 126                 "disabling mwait for CPU C-states\n", id->ident);
 127         idle_nomwait = 1;
 128         return 0;
 129 }
 130
 131 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 132         {
 133         set_no_mwait, "IFL91 board", {
 134         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 135         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 136         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 137         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 138         {
 139         set_no_mwait, "Extensa 5220", {
 140         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 141         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 142         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 143         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 144         {},
 145 };
 146
 147 /* --------------------------------------------------------------------------
 148                                 Errata Handling
 149    -------------------------------------------------------------------------- */
 150
 151 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 152 {
 153         u8 value1 = 0;
 154         u8 value2 = 0;
 155
 156
 157         if (!dev)
 158                 return -EINVAL;
 159
 160         /*
 161          * Note that 'dev' references the PIIX4 ACPI Controller.
 162          */
 163
 164         switch (dev->revision) {
 165         case 0:
 166                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 167                 break;
 168         case 1:
 169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 170                 break;
 171         case 2:
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 173                 break;
 174         case 3:
 175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 176                 break;
 177         default:
 178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 179                 break;
 180         }
 181
 182         switch (dev->revision) {
 183
 184         case 0:         /* PIIX4 A-step */
 185         case 1:         /* PIIX4 B-step */
 186                 /*
 187                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 188                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 189                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 190                  * 2002 PIIX4 specification update.  Applies to only older
 191                  * PIIX4 models.
 192                  */
 193                 errata.piix4.throttle = 1;
 194
 195         case 2:         /* PIIX4E */
 196         case 3:         /* PIIX4M */
 197                 /*
 198                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 199                  * Livelock") from the January 2002 PIIX4 specification update.
 200                  * Applies to all PIIX4 models.
 201                  */
 202
 203                 /*
 204                  * BM-IDE
 205                  * ------
 206                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 207                  * Status register address.  We'll use this later to read
 208                  * each IDE controller's DMA status to make sure we catch all
 209                  * DMA activity.
 210                  */
 211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 212                                      PCI_DEVICE_ID_INTEL_82371AB,
 213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 214                 if (dev) {
 215                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 216                         pci_dev_put(dev);
 217                 }
 218
 219                 /*
 220                  * Type-F DMA
 221                  * ----------
 222                  * Find the PIIX4 ISA Controller and read the Motherboard
 223                  * DMA controller's status to see if Type-F (Fast) DMA mode
 224                  * is enabled (bit 7) on either channel.  Note that we'll
 225                  * disable C3 support if this is enabled, as some legacy
 226                  * devices won't operate well if fast DMA is disabled.
 227                  */
 228                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 229                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 230                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 231                 if (dev) {
 232                         pci_read_config_byte(dev, 0x76, &value1);
 233                         pci_read_config_byte(dev, 0x77, &value2);
 234                         if ((value1 & 0x80) || (value2 & 0x80))
 235                                 errata.piix4.fdma = 1;
 236                         pci_dev_put(dev);
 237                 }
 238
 239                 break;
 240         }
 241
 242         if (errata.piix4.bmisx)
 243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 244                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 245         if (errata.piix4.fdma)
 246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 247                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 248
 249         return 0;
 250 }
 251
 252 static int acpi_processor_errata(struct acpi_processor *pr)
 253 {
 254         int result = 0;
 255         struct pci_dev *dev = NULL;
 256
 257
 258         if (!pr)
 259                 return -EINVAL;
 260
 261         /*
 262          * PIIX4
 263          */
 264         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 265                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 266                              PCI_ANY_ID, NULL);
 267         if (dev) {
 268                 result = acpi_processor_errata_piix4(dev);
 269                 pci_dev_put(dev);
 270         }
 271
 272         return result;
 273 }
 274
 275 /* --------------------------------------------------------------------------
 276                               Common ACPI processor functions
 277    -------------------------------------------------------------------------- */
 278
 279 /*
 280  * _PDC is required for a BIOS-OS handshake for most of the newer
 281  * ACPI processor features.
 282  */
 283 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 284 {
 285         struct acpi_object_list *pdc_in = pr->pdc;
 286         acpi_status status = AE_OK;
 287
 288
 289         if (!pdc_in)
 290                 return status;
 291         if (idle_nomwait) {
 292                 /*
 293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 294                  * mode will be disabled in the parameter of _PDC object.
 295                  * Of course C1_FFH access mode will also be disabled.
 296                  */
 297                 union acpi_object *obj;
 298                 u32 *buffer = NULL;
 299
 300                 obj = pdc_in->pointer;
 301                 buffer = (u32 *)(obj->buffer.pointer);
 302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 303
 304         }
 305         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 306
 307         if (ACPI_FAILURE(status))
 308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 309                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 310
 311         return status;
 312 }
 313
 314 /* --------------------------------------------------------------------------
 315                               FS Interface (/proc)
 316    -------------------------------------------------------------------------- */
 317
 318 static struct proc_dir_entry *acpi_processor_dir = NULL;
 319
 320 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 321 {
 322         struct acpi_processor *pr = seq->private;
 323
 324
 325         if (!pr)
 326                 goto end;
 327
 328         seq_printf(seq, "processor id:            %d\n"
 329                    "acpi id:                 %d\n"
 330                    "bus mastering control:   %s\n"
 331                    "power management:        %s\n"
 332                    "throttling control:      %s\n"
 333                    "limit interface:         %s\n",
 334                    pr->id,
 335                    pr->acpi_id,
 336                    pr->flags.bm_control ? "yes" : "no",
 337                    pr->flags.power ? "yes" : "no",
 338                    pr->flags.throttling ? "yes" : "no",
 339                    pr->flags.limit ? "yes" : "no");
 340
 341       end:
 342         return 0;
 343 }
 344
 345 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 346 {
 347         return single_open(file, acpi_processor_info_seq_show,
 348                            PDE(inode)->data);
 349 }
 350
 351 static int acpi_processor_add_fs(struct acpi_device *device)
 352 {
 353         struct proc_dir_entry *entry = NULL;
 354
 355
 356         if (!acpi_device_dir(device)) {
 357                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 358                                                      acpi_processor_dir);
 359                 if (!acpi_device_dir(device))
 360                         return -ENODEV;
 361         }
 362
 363         /* 'info' [R] */
 364         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 365                                  S_IRUGO, acpi_device_dir(device),
 366                                  &acpi_processor_info_fops,
 367                                  acpi_driver_data(device));
 368         if (!entry)
 369                 return -EIO;
 370
 371         /* 'throttling' [R/W] */
 372         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 373                                  S_IFREG | S_IRUGO | S_IWUSR,
 374                                  acpi_device_dir(device),
 375                                  &acpi_processor_throttling_fops,
 376                                  acpi_driver_data(device));
 377         if (!entry)
 378                 return -EIO;
 379
 380         /* 'limit' [R/W] */
 381         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 382                                  S_IFREG | S_IRUGO | S_IWUSR,
 383                                  acpi_device_dir(device),
 384                                  &acpi_processor_limit_fops,
 385                                  acpi_driver_data(device));
 386         if (!entry)
 387                 return -EIO;
 388         return 0;
 389 }
 390
 391 static int acpi_processor_remove_fs(struct acpi_device *device)
 392 {
 393
 394         if (acpi_device_dir(device)) {
 395                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 396                                   acpi_device_dir(device));
 397                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 398                                   acpi_device_dir(device));
 399                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 400                                   acpi_device_dir(device));
 401                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 402                 acpi_device_dir(device) = NULL;
 403         }
 404
 405         return 0;
 406 }
 407
 408 /* Use the acpiid in MADT to map cpus in case of SMP */
 409
 410 #ifndef CONFIG_SMP
 411 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 412 #else
 413
 414 static struct acpi_table_madt *madt;
 415
 416 static int map_lapic_id(struct acpi_subtable_header *entry,
 417                  u32 acpi_id, int *apic_id)
 418 {
 419         struct acpi_madt_local_apic *lapic =
 420                 (struct acpi_madt_local_apic *)entry;
 421         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 422             lapic->processor_id == acpi_id) {
 423                 *apic_id = lapic->id;
 424                 return 1;
 425         }
 426         return 0;
 427 }
 428
 429 static int map_lsapic_id(struct acpi_subtable_header *entry,
 430                 int device_declaration, u32 acpi_id, int *apic_id)
 431 {
 432         struct acpi_madt_local_sapic *lsapic =
 433                 (struct acpi_madt_local_sapic *)entry;
 434         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 435
 436         /* Only check enabled APICs*/
 437         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 438                 return 0;
 439
 440         /* Device statement declaration type */
 441         if (device_declaration) {
 442                 if (entry->length < 16)
 443                         printk(KERN_ERR PREFIX
 444                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 445                             tmp);
 446                 else if (lsapic->uid == acpi_id)
 447                         goto found;
 448         /* Processor statement declaration type */
 449         } else if (lsapic->processor_id == acpi_id)
 450                 goto found;
 451
 452         return 0;
 453 found:
 454         *apic_id = tmp;
 455         return 1;
 456 }
 457
 458 static int map_madt_entry(int type, u32 acpi_id)
 459 {
 460         unsigned long madt_end, entry;
 461         int apic_id = -1;
 462
 463         if (!madt)
 464                 return apic_id;
 465
 466         entry = (unsigned long)madt;
 467         madt_end = entry + madt->header.length;
 468
 469         /* Parse all entries looking for a match. */
 470
 471         entry += sizeof(struct acpi_table_madt);
 472         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 473                 struct acpi_subtable_header *header =
 474                         (struct acpi_subtable_header *)entry;
 475                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 476                         if (map_lapic_id(header, acpi_id, &apic_id))
 477                                 break;
 478                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 479                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 480                                 break;
 481                 }
 482                 entry += header->length;
 483         }
 484         return apic_id;
 485 }
 486
 487 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 488 {
 489         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 490         union acpi_object *obj;
 491         struct acpi_subtable_header *header;
 492         int apic_id = -1;
 493
 494         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 495                 goto exit;
 496
 497         if (!buffer.length || !buffer.pointer)
 498                 goto exit;
 499
 500         obj = buffer.pointer;
 501         if (obj->type != ACPI_TYPE_BUFFER ||
 502             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 503                 goto exit;
 504         }
 505
 506         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 507         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 508                 map_lapic_id(header, acpi_id, &apic_id);
 509         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 510                 map_lsapic_id(header, type, acpi_id, &apic_id);
 511         }
 512
 513 exit:
 514         if (buffer.pointer)
 515                 kfree(buffer.pointer);
 516         return apic_id;
 517 }
 518
 519 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 520 {
 521         int i;
 522         int apic_id = -1;
 523
 524         apic_id = map_mat_entry(handle, type, acpi_id);
 525         if (apic_id == -1)
 526                 apic_id = map_madt_entry(type, acpi_id);
 527         if (apic_id == -1)
 528                 return apic_id;
 529
 530         for_each_possible_cpu(i) {
 531                 if (cpu_physical_id(i) == apic_id)
 532                         return i;
 533         }
 534         return -1;
 535 }
 536 #endif
 537
 538 /* --------------------------------------------------------------------------
 539                                  Driver Interface
 540    -------------------------------------------------------------------------- */
 541
 542 static int acpi_processor_get_info(struct acpi_device *device)
 543 {
 544         acpi_status status = 0;
 545         union acpi_object object = { 0 };
 546         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 547         struct acpi_processor *pr;
 548         int cpu_index, device_declaration = 0;
 549         static int cpu0_initialized;
 550
 551         pr = acpi_driver_data(device);
 552         if (!pr)
 553                 return -EINVAL;
 554
 555         if (num_online_cpus() > 1)
 556                 errata.smp = TRUE;
 557
 558         acpi_processor_errata(pr);
 559
 560         /*
 561          * Check to see if we have bus mastering arbitration control.  This
 562          * is required for proper C3 usage (to maintain cache coherency).
 563          */
 564         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 565                 pr->flags.bm_control = 1;
 566                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 567                                   "Bus mastering arbitration control present\n"));
 568         } else
 569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 570                                   "No bus mastering arbitration control\n"));
 571
 572         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
 573                 /*
 574                  * Declared with "Device" statement; match _UID.
 575                  * Note that we don't handle string _UIDs yet.
 576                  */
 577                 unsigned long long value;
 578                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 579                                                 NULL, &value);
 580                 if (ACPI_FAILURE(status)) {
 581                         printk(KERN_ERR PREFIX
 582                             "Evaluating processor _UID [%#x]\n", status);
 583                         return -ENODEV;
 584                 }
 585                 device_declaration = 1;
 586                 pr->acpi_id = value;
 587         } else {
 588                 /* Declared with "Processor" statement; match ProcessorID */
 589                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 590                 if (ACPI_FAILURE(status)) {
 591                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 592                         return -ENODEV;
 593                 }
 594
 595                 /*
 596                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 597                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 598                  *      arch/xxx/acpi.c
 599                  */
 600                 pr->acpi_id = object.processor.proc_id;
 601         }
 602         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 603
 604         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 605         if (!cpu0_initialized && (cpu_index == -1) &&
 606             (num_online_cpus() == 1)) {
 607                 cpu_index = 0;
 608         }
 609
 610         cpu0_initialized = 1;
 611
 612         pr->id = cpu_index;
 613
 614         /*
 615          *  Extra Processor objects may be enumerated on MP systems with
 616          *  less than the max # of CPUs. They should be ignored _iff
 617          *  they are physically not present.
 618          */
 619         if (pr->id == -1) {
 620                 if (ACPI_FAILURE
 621                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 622                         return -ENODEV;
 623                 }
 624         }
 625
 626         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 627                           pr->acpi_id));
 628
 629         if (!object.processor.pblk_address)
 630                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 631         else if (object.processor.pblk_length != 6)
 632                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 633                             object.processor.pblk_length);
 634         else {
 635                 pr->throttling.address = object.processor.pblk_address;
 636                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 637                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 638
 639                 pr->pblk = object.processor.pblk_address;
 640
 641                 /*
 642                  * We don't care about error returns - we just try to mark
 643                  * these reserved so that nobody else is confused into thinking
 644                  * that this region might be unused..
 645                  *
 646                  * (In particular, allocating the IO range for Cardbus)
 647                  */
 648                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 649         }
 650
 651         /*
 652          * If ACPI describes a slot number for this CPU, we can use it
 653          * ensure we get the right value in the "physical id" field
 654          * of /proc/cpuinfo
 655          */
 656         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 657         if (ACPI_SUCCESS(status))
 658                 arch_fix_phys_package_id(pr->id, object.integer.value);
 659
 660         return 0;
 661 }
 662
 663 static DEFINE_PER_CPU(void *, processor_device_array);
 664
 665 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 666 {
 667         int result = 0;
 668         acpi_status status = AE_OK;
 669         struct acpi_processor *pr;
 670         struct sys_device *sysdev;
 671
 672         pr = acpi_driver_data(device);
 673
 674         result = acpi_processor_get_info(device);
 675         if (result) {
 676                 /* Processor is physically not present */
 677                 return 0;
 678         }
 679
 680         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 681
 682         /*
 683          * Buggy BIOS check
 684          * ACPI id of processors can be reported wrongly by the BIOS.
 685          * Don't trust it blindly
 686          */
 687         if (per_cpu(processor_device_array, pr->id) != NULL &&
 688             per_cpu(processor_device_array, pr->id) != device) {
 689                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 690                         "for the processor\n");
 691                 return -ENODEV;
 692         }
 693         per_cpu(processor_device_array, pr->id) = device;
 694
 695         per_cpu(processors, pr->id) = pr;
 696
 697         result = acpi_processor_add_fs(device);
 698         if (result)
 699                 goto end;
 700
 701         sysdev = get_cpu_sysdev(pr->id);
 702         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 703                 return -EFAULT;
 704
 705         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 706                                              acpi_processor_notify, pr);
 707
 708         /* _PDC call should be done before doing anything else (if reqd.). */
 709         arch_acpi_processor_init_pdc(pr);
 710         acpi_processor_set_pdc(pr);
 711 #ifdef CONFIG_CPU_FREQ
 712         acpi_processor_ppc_has_changed(pr);
 713 #endif
 714         acpi_processor_get_throttling_info(pr);
 715         acpi_processor_get_limit_info(pr);
 716
 717
 718         acpi_processor_power_init(pr, device);
 719
 720         pr->cdev = thermal_cooling_device_register("Processor", device,
 721                                                 &processor_cooling_ops);
 722         if (IS_ERR(pr->cdev)) {
 723                 result = PTR_ERR(pr->cdev);
 724                 goto end;
 725         }
 726
 727         dev_info(&device->dev, "registered as cooling_device%d\n",
 728                  pr->cdev->id);
 729
 730         result = sysfs_create_link(&device->dev.kobj,
 731                                    &pr->cdev->device.kobj,
 732                                    "thermal_cooling");
 733         if (result)
 734                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 735         result = sysfs_create_link(&pr->cdev->device.kobj,
 736                                    &device->dev.kobj,
 737                                    "device");
 738         if (result)
 739                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 740
 741         if (pr->flags.throttling) {
 742                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 743                        acpi_device_name(device), acpi_device_bid(device));
 744                 printk(" %d throttling states", pr->throttling.state_count);
 745                 printk(")\n");
 746         }
 747
 748       end:
 749
 750         return result;
 751 }
 752
 753 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 754 {
 755         struct acpi_processor *pr = data;
 756         struct acpi_device *device = NULL;
 757         int saved;
 758
 759         if (!pr)
 760                 return;
 761
 762         if (acpi_bus_get_device(pr->handle, &device))
 763                 return;
 764
 765         switch (event) {
 766         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 767                 saved = pr->performance_platform_limit;
 768                 acpi_processor_ppc_has_changed(pr);
 769                 if (saved == pr->performance_platform_limit)
 770                         break;
 771                 acpi_bus_generate_proc_event(device, event,
 772                                         pr->performance_platform_limit);
 773                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 774                                                   dev_name(&device->dev), event,
 775                                                   pr->performance_platform_limit);
 776                 break;
 777         case ACPI_PROCESSOR_NOTIFY_POWER:
 778                 acpi_processor_cst_has_changed(pr);
 779                 acpi_bus_generate_proc_event(device, event, 0);
 780                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 781                                                   dev_name(&device->dev), event, 0);
 782                 break;
 783         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 784                 acpi_processor_tstate_has_changed(pr);
 785                 acpi_bus_generate_proc_event(device, event, 0);
 786                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 787                                                   dev_name(&device->dev), event, 0);
 788         default:
 789                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 790                                   "Unsupported event [0x%x]\n", event));
 791                 break;
 792         }
 793
 794         return;
 795 }
 796
 797 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 798                 unsigned long action, void *hcpu)
 799 {
 800         unsigned int cpu = (unsigned long)hcpu;
 801         struct acpi_processor *pr = per_cpu(processors, cpu);
 802
 803         if (action == CPU_ONLINE && pr) {
 804                 acpi_processor_ppc_has_changed(pr);
 805                 acpi_processor_cst_has_changed(pr);
 806                 acpi_processor_tstate_has_changed(pr);
 807         }
 808         return NOTIFY_OK;
 809 }
 810
 811 static struct notifier_block acpi_cpu_notifier =
 812 {
 813             .notifier_call = acpi_cpu_soft_notify,
 814 };
 815
 816 static int acpi_processor_add(struct acpi_device *device)
 817 {
 818         struct acpi_processor *pr = NULL;
 819
 820
 821         if (!device)
 822                 return -EINVAL;
 823
 824         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 825         if (!pr)
 826                 return -ENOMEM;
 827
 828         if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 829                 kfree(pr);
 830                 return -ENOMEM;
 831         }
 832
 833         pr->handle = device->handle;
 834         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 835         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 836         device->driver_data = pr;
 837
 838         return 0;
 839 }
 840
 841 static int acpi_processor_remove(struct acpi_device *device, int type)
 842 {
 843         acpi_status status = AE_OK;
 844         struct acpi_processor *pr = NULL;
 845
 846
 847         if (!device || !acpi_driver_data(device))
 848                 return -EINVAL;
 849
 850         pr = acpi_driver_data(device);
 851
 852         if (pr->id >= nr_cpu_ids)
 853                 goto free;
 854
 855         if (type == ACPI_BUS_REMOVAL_EJECT) {
 856                 if (acpi_processor_handle_eject(pr))
 857                         return -EINVAL;
 858         }
 859
 860         acpi_processor_power_exit(pr, device);
 861
 862         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 863                                             acpi_processor_notify);
 864
 865         sysfs_remove_link(&device->dev.kobj, "sysdev");
 866
 867         acpi_processor_remove_fs(device);
 868
 869         if (pr->cdev) {
 870                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 871                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 872                 thermal_cooling_device_unregister(pr->cdev);
 873                 pr->cdev = NULL;
 874         }
 875
 876         per_cpu(processors, pr->id) = NULL;
 877         per_cpu(processor_device_array, pr->id) = NULL;
 878
 879 free:
 880         free_cpumask_var(pr->throttling.shared_cpu_map);
 881         kfree(pr);
 882
 883         return 0;
 884 }
 885
 886 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 887 /****************************************************************************
 888  *      Acpi processor hotplug support                                      *
 889  ****************************************************************************/
 890
 891 static int is_processor_present(acpi_handle handle)
 892 {
 893         acpi_status status;
 894         unsigned long long sta = 0;
 895
 896
 897         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 898
 899         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 900                 return 1;
 901
 902         /*
 903          * _STA is mandatory for a processor that supports hot plug
 904          */
 905         if (status == AE_NOT_FOUND)
 906                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 907                                 "Processor does not support hot plug\n"));
 908         else
 909                 ACPI_EXCEPTION((AE_INFO, status,
 910                                 "Processor Device is not present"));
 911         return 0;
 912 }
 913
 914 static
 915 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 916 {
 917         acpi_handle phandle;
 918         struct acpi_device *pdev;
 919         struct acpi_processor *pr;
 920
 921
 922         if (acpi_get_parent(handle, &phandle)) {
 923                 return -ENODEV;
 924         }
 925
 926         if (acpi_bus_get_device(phandle, &pdev)) {
 927                 return -ENODEV;
 928         }
 929
 930         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 931                 return -ENODEV;
 932         }
 933
 934         acpi_bus_start(*device);
 935
 936         pr = acpi_driver_data(*device);
 937         if (!pr)
 938                 return -ENODEV;
 939
 940         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 941                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 942         }
 943         return 0;
 944 }
 945
 946 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 947                                                 u32 event, void *data)
 948 {
 949         struct acpi_processor *pr;
 950         struct acpi_device *device = NULL;
 951         int result;
 952
 953
 954         switch (event) {
 955         case ACPI_NOTIFY_BUS_CHECK:
 956         case ACPI_NOTIFY_DEVICE_CHECK:
 957                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 958                 "Processor driver received %s event\n",
 959                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 960                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 961
 962                 if (!is_processor_present(handle))
 963                         break;
 964
 965                 if (acpi_bus_get_device(handle, &device)) {
 966                         result = acpi_processor_device_add(handle, &device);
 967                         if (result)
 968                                 printk(KERN_ERR PREFIX
 969                                             "Unable to add the device\n");
 970                         break;
 971                 }
 972
 973                 pr = acpi_driver_data(device);
 974                 if (!pr) {
 975                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 976                         break;
 977                 }
 978
 979                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 980                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 981                         break;
 982                 }
 983
 984                 result = acpi_processor_start(device);
 985                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 986                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 987                 } else {
 988                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 989                                     acpi_device_bid(device));
 990                 }
 991                 break;
 992         case ACPI_NOTIFY_EJECT_REQUEST:
 993                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 994                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 995
 996                 if (acpi_bus_get_device(handle, &device)) {
 997                         printk(KERN_ERR PREFIX
 998                                     "Device don't exist, dropping EJECT\n");
 999                         break;
1000                 }
1001                 pr = acpi_driver_data(device);
1002                 if (!pr) {
1003                         printk(KERN_ERR PREFIX
1004                                     "Driver data is NULL, dropping EJECT\n");
1005                         return;
1006                 }
1007
1008                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1009                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1010                 break;
1011         default:
1012                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1013                                   "Unsupported event [0x%x]\n", event));
1014                 break;
1015         }
1016
1017         return;
1018 }
1019
1020 static acpi_status
1021 processor_walk_namespace_cb(acpi_handle handle,
1022                             u32 lvl, void *context, void **rv)
1023 {
1024         acpi_status status;
1025         int *action = context;
1026         acpi_object_type type = 0;
1027
1028         status = acpi_get_type(handle, &type);
1029         if (ACPI_FAILURE(status))
1030                 return (AE_OK);
1031
1032         if (type != ACPI_TYPE_PROCESSOR)
1033                 return (AE_OK);
1034
1035         switch (*action) {
1036         case INSTALL_NOTIFY_HANDLER:
1037                 acpi_install_notify_handler(handle,
1038                                             ACPI_SYSTEM_NOTIFY,
1039                                             acpi_processor_hotplug_notify,
1040                                             NULL);
1041                 break;
1042         case UNINSTALL_NOTIFY_HANDLER:
1043                 acpi_remove_notify_handler(handle,
1044                                            ACPI_SYSTEM_NOTIFY,
1045                                            acpi_processor_hotplug_notify);
1046                 break;
1047         default:
1048                 break;
1049         }
1050
1051         return (AE_OK);
1052 }
1053
1054 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1055 {
1056
1057         if (!is_processor_present(handle)) {
1058                 return AE_ERROR;
1059         }
1060
1061         if (acpi_map_lsapic(handle, p_cpu))
1062                 return AE_ERROR;
1063
1064         if (arch_register_cpu(*p_cpu)) {
1065                 acpi_unmap_lsapic(*p_cpu);
1066                 return AE_ERROR;
1067         }
1068
1069         return AE_OK;
1070 }
1071
1072 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1073 {
1074         if (cpu_online(pr->id))
1075                 cpu_down(pr->id);
1076
1077         arch_unregister_cpu(pr->id);
1078         acpi_unmap_lsapic(pr->id);
1079         return (0);
1080 }
1081 #else
1082 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1083 {
1084         return AE_ERROR;
1085 }
1086 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1087 {
1088         return (-EINVAL);
1089 }
1090 #endif
1091
1092 static
1093 void acpi_processor_install_hotplug_notify(void)
1094 {
1095 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1096         int action = INSTALL_NOTIFY_HANDLER;
1097         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1098                             ACPI_ROOT_OBJECT,
1099                             ACPI_UINT32_MAX,
1100                             processor_walk_namespace_cb, &action, NULL);
1101 #endif
1102         register_hotcpu_notifier(&acpi_cpu_notifier);
1103 }
1104
1105 static
1106 void acpi_processor_uninstall_hotplug_notify(void)
1107 {
1108 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1109         int action = UNINSTALL_NOTIFY_HANDLER;
1110         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1111                             ACPI_ROOT_OBJECT,
1112                             ACPI_UINT32_MAX,
1113                             processor_walk_namespace_cb, &action, NULL);
1114 #endif
1115         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1116 }
1117
1118 /*
1119  * We keep the driver loaded even when ACPI is not running.
1120  * This is needed for the powernow-k8 driver, that works even without
1121  * ACPI, but needs symbols from this driver
1122  */
1123
1124 static int __init acpi_processor_init(void)
1125 {
1126         int result = 0;
1127
1128         memset(&errata, 0, sizeof(errata));
1129
1130 #ifdef CONFIG_SMP
1131         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1132                                 (struct acpi_table_header **)&madt)))
1133                 madt = NULL;
1134 #endif
1135
1136         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1137         if (!acpi_processor_dir)
1138                 return -ENOMEM;
1139
1140         /*
1141          * Check whether the system is DMI table. If yes, OSPM
1142          * should not use mwait for CPU-states.
1143          */
1144         dmi_check_system(processor_idle_dmi_table);
1145         result = cpuidle_register_driver(&acpi_idle_driver);
1146         if (result < 0)
1147                 goto out_proc;
1148
1149         result = acpi_bus_register_driver(&acpi_processor_driver);
1150         if (result < 0)
1151                 goto out_cpuidle;
1152
1153         acpi_processor_install_hotplug_notify();
1154
1155         acpi_thermal_cpufreq_init();
1156
1157         acpi_processor_ppc_init();
1158
1159         acpi_processor_throttling_init();
1160
1161         return 0;
1162
1163 out_cpuidle:
1164         cpuidle_unregister_driver(&acpi_idle_driver);
1165
1166 out_proc:
1167         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1168
1169         return result;
1170 }
1171
1172 static void __exit acpi_processor_exit(void)
1173 {
1174         acpi_processor_ppc_exit();
1175
1176         acpi_thermal_cpufreq_exit();
1177
1178         acpi_processor_uninstall_hotplug_notify();
1179
1180         acpi_bus_unregister_driver(&acpi_processor_driver);
1181
1182         cpuidle_unregister_driver(&acpi_idle_driver);
1183
1184         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1185
1186         return;
1187 }
1188
1189 module_init(acpi_processor_init);
1190 module_exit(acpi_processor_exit);
1191
1192 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1193
1194 MODULE_ALIAS("processor");