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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         acpi_device_dir(device)->owner = THIS_MODULE;
 363
 364         /* 'info' [R] */
 365         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 366                                  S_IRUGO, acpi_device_dir(device),
 367                                  &acpi_processor_info_fops,
 368                                  acpi_driver_data(device));
 369         if (!entry)
 370                 return -EIO;
 371
 372         /* 'throttling' [R/W] */
 373         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 374                                  S_IFREG | S_IRUGO | S_IWUSR,
 375                                  acpi_device_dir(device),
 376                                  &acpi_processor_throttling_fops,
 377                                  acpi_driver_data(device));
 378         if (!entry)
 379                 return -EIO;
 380
 381         /* 'limit' [R/W] */
 382         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 383                                  S_IFREG | S_IRUGO | S_IWUSR,
 384                                  acpi_device_dir(device),
 385                                  &acpi_processor_limit_fops,
 386                                  acpi_driver_data(device));
 387         if (!entry)
 388                 return -EIO;
 389         return 0;
 390 }
 391
 392 static int acpi_processor_remove_fs(struct acpi_device *device)
 393 {
 394
 395         if (acpi_device_dir(device)) {
 396                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 397                                   acpi_device_dir(device));
 398                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 399                                   acpi_device_dir(device));
 400                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 401                                   acpi_device_dir(device));
 402                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 403                 acpi_device_dir(device) = NULL;
 404         }
 405
 406         return 0;
 407 }
 408
 409 /* Use the acpiid in MADT to map cpus in case of SMP */
 410
 411 #ifndef CONFIG_SMP
 412 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 413 #else
 414
 415 static struct acpi_table_madt *madt;
 416
 417 static int map_lapic_id(struct acpi_subtable_header *entry,
 418                  u32 acpi_id, int *apic_id)
 419 {
 420         struct acpi_madt_local_apic *lapic =
 421                 (struct acpi_madt_local_apic *)entry;
 422         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 423             lapic->processor_id == acpi_id) {
 424                 *apic_id = lapic->id;
 425                 return 1;
 426         }
 427         return 0;
 428 }
 429
 430 static int map_lsapic_id(struct acpi_subtable_header *entry,
 431                 int device_declaration, u32 acpi_id, int *apic_id)
 432 {
 433         struct acpi_madt_local_sapic *lsapic =
 434                 (struct acpi_madt_local_sapic *)entry;
 435         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 436
 437         /* Only check enabled APICs*/
 438         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 439                 return 0;
 440
 441         /* Device statement declaration type */
 442         if (device_declaration) {
 443                 if (entry->length < 16)
 444                         printk(KERN_ERR PREFIX
 445                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 446                             tmp);
 447                 else if (lsapic->uid == acpi_id)
 448                         goto found;
 449         /* Processor statement declaration type */
 450         } else if (lsapic->processor_id == acpi_id)
 451                 goto found;
 452
 453         return 0;
 454 found:
 455         *apic_id = tmp;
 456         return 1;
 457 }
 458
 459 static int map_madt_entry(int type, u32 acpi_id)
 460 {
 461         unsigned long madt_end, entry;
 462         int apic_id = -1;
 463
 464         if (!madt)
 465                 return apic_id;
 466
 467         entry = (unsigned long)madt;
 468         madt_end = entry + madt->header.length;
 469
 470         /* Parse all entries looking for a match. */
 471
 472         entry += sizeof(struct acpi_table_madt);
 473         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 474                 struct acpi_subtable_header *header =
 475                         (struct acpi_subtable_header *)entry;
 476                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 477                         if (map_lapic_id(header, acpi_id, &apic_id))
 478                                 break;
 479                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 480                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 481                                 break;
 482                 }
 483                 entry += header->length;
 484         }
 485         return apic_id;
 486 }
 487
 488 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 489 {
 490         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 491         union acpi_object *obj;
 492         struct acpi_subtable_header *header;
 493         int apic_id = -1;
 494
 495         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 496                 goto exit;
 497
 498         if (!buffer.length || !buffer.pointer)
 499                 goto exit;
 500
 501         obj = buffer.pointer;
 502         if (obj->type != ACPI_TYPE_BUFFER ||
 503             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 504                 goto exit;
 505         }
 506
 507         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 508         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 509                 map_lapic_id(header, acpi_id, &apic_id);
 510         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 511                 map_lsapic_id(header, type, acpi_id, &apic_id);
 512         }
 513
 514 exit:
 515         if (buffer.pointer)
 516                 kfree(buffer.pointer);
 517         return apic_id;
 518 }
 519
 520 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 521 {
 522         int i;
 523         int apic_id = -1;
 524
 525         apic_id = map_mat_entry(handle, type, acpi_id);
 526         if (apic_id == -1)
 527                 apic_id = map_madt_entry(type, acpi_id);
 528         if (apic_id == -1)
 529                 return apic_id;
 530
 531         for_each_possible_cpu(i) {
 532                 if (cpu_physical_id(i) == apic_id)
 533                         return i;
 534         }
 535         return -1;
 536 }
 537 #endif
 538
 539 /* --------------------------------------------------------------------------
 540                                  Driver Interface
 541    -------------------------------------------------------------------------- */
 542
 543 static int acpi_processor_get_info(struct acpi_device *device)
 544 {
 545         acpi_status status = 0;
 546         union acpi_object object = { 0 };
 547         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 548         struct acpi_processor *pr;
 549         int cpu_index, device_declaration = 0;
 550         static int cpu0_initialized;
 551
 552         pr = acpi_driver_data(device);
 553         if (!pr)
 554                 return -EINVAL;
 555
 556         if (num_online_cpus() > 1)
 557                 errata.smp = TRUE;
 558
 559         acpi_processor_errata(pr);
 560
 561         /*
 562          * Check to see if we have bus mastering arbitration control.  This
 563          * is required for proper C3 usage (to maintain cache coherency).
 564          */
 565         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 566                 pr->flags.bm_control = 1;
 567                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 568                                   "Bus mastering arbitration control present\n"));
 569         } else
 570                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 571                                   "No bus mastering arbitration control\n"));
 572
 573         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
 574                 /*
 575                  * Declared with "Device" statement; match _UID.
 576                  * Note that we don't handle string _UIDs yet.
 577                  */
 578                 unsigned long long value;
 579                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 580                                                 NULL, &value);
 581                 if (ACPI_FAILURE(status)) {
 582                         printk(KERN_ERR PREFIX
 583                             "Evaluating processor _UID [%#x]\n", status);
 584                         return -ENODEV;
 585                 }
 586                 device_declaration = 1;
 587                 pr->acpi_id = value;
 588         } else {
 589                 /* Declared with "Processor" statement; match ProcessorID */
 590                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 591                 if (ACPI_FAILURE(status)) {
 592                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 593                         return -ENODEV;
 594                 }
 595
 596                 /*
 597                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 598                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 599                  *      arch/xxx/acpi.c
 600                  */
 601                 pr->acpi_id = object.processor.proc_id;
 602         }
 603         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 604
 605         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 606         if (!cpu0_initialized && (cpu_index == -1) &&
 607             (num_online_cpus() == 1)) {
 608                 cpu_index = 0;
 609         }
 610
 611         cpu0_initialized = 1;
 612
 613         pr->id = cpu_index;
 614
 615         /*
 616          *  Extra Processor objects may be enumerated on MP systems with
 617          *  less than the max # of CPUs. They should be ignored _iff
 618          *  they are physically not present.
 619          */
 620         if (pr->id == -1) {
 621                 if (ACPI_FAILURE
 622                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 623                         return -ENODEV;
 624                 }
 625         }
 626
 627         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 628                           pr->acpi_id));
 629
 630         if (!object.processor.pblk_address)
 631                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 632         else if (object.processor.pblk_length != 6)
 633                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 634                             object.processor.pblk_length);
 635         else {
 636                 pr->throttling.address = object.processor.pblk_address;
 637                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 638                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 639
 640                 pr->pblk = object.processor.pblk_address;
 641
 642                 /*
 643                  * We don't care about error returns - we just try to mark
 644                  * these reserved so that nobody else is confused into thinking
 645                  * that this region might be unused..
 646                  *
 647                  * (In particular, allocating the IO range for Cardbus)
 648                  */
 649                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 650         }
 651
 652         /*
 653          * If ACPI describes a slot number for this CPU, we can use it
 654          * ensure we get the right value in the "physical id" field
 655          * of /proc/cpuinfo
 656          */
 657         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 658         if (ACPI_SUCCESS(status))
 659                 arch_fix_phys_package_id(pr->id, object.integer.value);
 660
 661         return 0;
 662 }
 663
 664 static DEFINE_PER_CPU(void *, processor_device_array);
 665
 666 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 667 {
 668         int result = 0;
 669         acpi_status status = AE_OK;
 670         struct acpi_processor *pr;
 671         struct sys_device *sysdev;
 672
 673         pr = acpi_driver_data(device);
 674
 675         result = acpi_processor_get_info(device);
 676         if (result) {
 677                 /* Processor is physically not present */
 678                 return 0;
 679         }
 680
 681         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 682
 683         /*
 684          * Buggy BIOS check
 685          * ACPI id of processors can be reported wrongly by the BIOS.
 686          * Don't trust it blindly
 687          */
 688         if (per_cpu(processor_device_array, pr->id) != NULL &&
 689             per_cpu(processor_device_array, pr->id) != device) {
 690                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 691                         "for the processor\n");
 692                 return -ENODEV;
 693         }
 694         per_cpu(processor_device_array, pr->id) = device;
 695
 696         per_cpu(processors, pr->id) = pr;
 697
 698         result = acpi_processor_add_fs(device);
 699         if (result)
 700                 goto end;
 701
 702         sysdev = get_cpu_sysdev(pr->id);
 703         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 704                 return -EFAULT;
 705
 706         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 707                                              acpi_processor_notify, pr);
 708
 709         /* _PDC call should be done before doing anything else (if reqd.). */
 710         arch_acpi_processor_init_pdc(pr);
 711         acpi_processor_set_pdc(pr);
 712 #ifdef CONFIG_CPU_FREQ
 713         acpi_processor_ppc_has_changed(pr);
 714 #endif
 715         acpi_processor_get_throttling_info(pr);
 716         acpi_processor_get_limit_info(pr);
 717
 718
 719         acpi_processor_power_init(pr, device);
 720
 721         pr->cdev = thermal_cooling_device_register("Processor", device,
 722                                                 &processor_cooling_ops);
 723         if (IS_ERR(pr->cdev)) {
 724                 result = PTR_ERR(pr->cdev);
 725                 goto end;
 726         }
 727
 728         dev_info(&device->dev, "registered as cooling_device%d\n",
 729                  pr->cdev->id);
 730
 731         result = sysfs_create_link(&device->dev.kobj,
 732                                    &pr->cdev->device.kobj,
 733                                    "thermal_cooling");
 734         if (result)
 735                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 736         result = sysfs_create_link(&pr->cdev->device.kobj,
 737                                    &device->dev.kobj,
 738                                    "device");
 739         if (result)
 740                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 741
 742         if (pr->flags.throttling) {
 743                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 744                        acpi_device_name(device), acpi_device_bid(device));
 745                 printk(" %d throttling states", pr->throttling.state_count);
 746                 printk(")\n");
 747         }
 748
 749       end:
 750
 751         return result;
 752 }
 753
 754 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 755 {
 756         struct acpi_processor *pr = data;
 757         struct acpi_device *device = NULL;
 758         int saved;
 759
 760         if (!pr)
 761                 return;
 762
 763         if (acpi_bus_get_device(pr->handle, &device))
 764                 return;
 765
 766         switch (event) {
 767         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 768                 saved = pr->performance_platform_limit;
 769                 acpi_processor_ppc_has_changed(pr);
 770                 if (saved == pr->performance_platform_limit)
 771                         break;
 772                 acpi_bus_generate_proc_event(device, event,
 773                                         pr->performance_platform_limit);
 774                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 775                                                   dev_name(&device->dev), event,
 776                                                   pr->performance_platform_limit);
 777                 break;
 778         case ACPI_PROCESSOR_NOTIFY_POWER:
 779                 acpi_processor_cst_has_changed(pr);
 780                 acpi_bus_generate_proc_event(device, event, 0);
 781                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 782                                                   dev_name(&device->dev), event, 0);
 783                 break;
 784         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 785                 acpi_processor_tstate_has_changed(pr);
 786                 acpi_bus_generate_proc_event(device, event, 0);
 787                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 788                                                   dev_name(&device->dev), event, 0);
 789         default:
 790                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 791                                   "Unsupported event [0x%x]\n", event));
 792                 break;
 793         }
 794
 795         return;
 796 }
 797
 798 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 799                 unsigned long action, void *hcpu)
 800 {
 801         unsigned int cpu = (unsigned long)hcpu;
 802         struct acpi_processor *pr = per_cpu(processors, cpu);
 803
 804         if (action == CPU_ONLINE && pr) {
 805                 acpi_processor_ppc_has_changed(pr);
 806                 acpi_processor_cst_has_changed(pr);
 807                 acpi_processor_tstate_has_changed(pr);
 808         }
 809         return NOTIFY_OK;
 810 }
 811
 812 static struct notifier_block acpi_cpu_notifier =
 813 {
 814             .notifier_call = acpi_cpu_soft_notify,
 815 };
 816
 817 static int acpi_processor_add(struct acpi_device *device)
 818 {
 819         struct acpi_processor *pr = NULL;
 820
 821
 822         if (!device)
 823                 return -EINVAL;
 824
 825         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 826         if (!pr)
 827                 return -ENOMEM;
 828
 829         if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 830                 kfree(pr);
 831                 return -ENOMEM;
 832         }
 833
 834         pr->handle = device->handle;
 835         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 836         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 837         device->driver_data = pr;
 838
 839         return 0;
 840 }
 841
 842 static int acpi_processor_remove(struct acpi_device *device, int type)
 843 {
 844         acpi_status status = AE_OK;
 845         struct acpi_processor *pr = NULL;
 846
 847
 848         if (!device || !acpi_driver_data(device))
 849                 return -EINVAL;
 850
 851         pr = acpi_driver_data(device);
 852
 853         if (pr->id >= nr_cpu_ids)
 854                 goto free;
 855
 856         if (type == ACPI_BUS_REMOVAL_EJECT) {
 857                 if (acpi_processor_handle_eject(pr))
 858                         return -EINVAL;
 859         }
 860
 861         acpi_processor_power_exit(pr, device);
 862
 863         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 864                                             acpi_processor_notify);
 865
 866         sysfs_remove_link(&device->dev.kobj, "sysdev");
 867
 868         acpi_processor_remove_fs(device);
 869
 870         if (pr->cdev) {
 871                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 872                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 873                 thermal_cooling_device_unregister(pr->cdev);
 874                 pr->cdev = NULL;
 875         }
 876
 877         per_cpu(processors, pr->id) = NULL;
 878         per_cpu(processor_device_array, pr->id) = NULL;
 879
 880 free:
 881         free_cpumask_var(pr->throttling.shared_cpu_map);
 882         kfree(pr);
 883
 884         return 0;
 885 }
 886
 887 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 888 /****************************************************************************
 889  *      Acpi processor hotplug support                                      *
 890  ****************************************************************************/
 891
 892 static int is_processor_present(acpi_handle handle)
 893 {
 894         acpi_status status;
 895         unsigned long long sta = 0;
 896
 897
 898         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 899
 900         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 901                 return 1;
 902
 903         /*
 904          * _STA is mandatory for a processor that supports hot plug
 905          */
 906         if (status == AE_NOT_FOUND)
 907                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 908                                 "Processor does not support hot plug\n"));
 909         else
 910                 ACPI_EXCEPTION((AE_INFO, status,
 911                                 "Processor Device is not present"));
 912         return 0;
 913 }
 914
 915 static
 916 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 917 {
 918         acpi_handle phandle;
 919         struct acpi_device *pdev;
 920         struct acpi_processor *pr;
 921
 922
 923         if (acpi_get_parent(handle, &phandle)) {
 924                 return -ENODEV;
 925         }
 926
 927         if (acpi_bus_get_device(phandle, &pdev)) {
 928                 return -ENODEV;
 929         }
 930
 931         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 932                 return -ENODEV;
 933         }
 934
 935         acpi_bus_start(*device);
 936
 937         pr = acpi_driver_data(*device);
 938         if (!pr)
 939                 return -ENODEV;
 940
 941         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 942                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 943         }
 944         return 0;
 945 }
 946
 947 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 948                                                 u32 event, void *data)
 949 {
 950         struct acpi_processor *pr;
 951         struct acpi_device *device = NULL;
 952         int result;
 953
 954
 955         switch (event) {
 956         case ACPI_NOTIFY_BUS_CHECK:
 957         case ACPI_NOTIFY_DEVICE_CHECK:
 958                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 959                 "Processor driver received %s event\n",
 960                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 961                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 962
 963                 if (!is_processor_present(handle))
 964                         break;
 965
 966                 if (acpi_bus_get_device(handle, &device)) {
 967                         result = acpi_processor_device_add(handle, &device);
 968                         if (result)
 969                                 printk(KERN_ERR PREFIX
 970                                             "Unable to add the device\n");
 971                         break;
 972                 }
 973
 974                 pr = acpi_driver_data(device);
 975                 if (!pr) {
 976                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 977                         break;
 978                 }
 979
 980                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 981                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 982                         break;
 983                 }
 984
 985                 result = acpi_processor_start(device);
 986                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 987                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 988                 } else {
 989                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 990                                     acpi_device_bid(device));
 991                 }
 992                 break;
 993         case ACPI_NOTIFY_EJECT_REQUEST:
 994                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 995                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 996
 997                 if (acpi_bus_get_device(handle, &device)) {
 998                         printk(KERN_ERR PREFIX
 999                                     "Device don't exist, dropping EJECT\n");
1000                         break;
1001                 }
1002                 pr = acpi_driver_data(device);
1003                 if (!pr) {
1004                         printk(KERN_ERR PREFIX
1005                                     "Driver data is NULL, dropping EJECT\n");
1006                         return;
1007                 }
1008
1009                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
1010                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1011                 break;
1012         default:
1013                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1014                                   "Unsupported event [0x%x]\n", event));
1015                 break;
1016         }
1017
1018         return;
1019 }
1020
1021 static acpi_status
1022 processor_walk_namespace_cb(acpi_handle handle,
1023                             u32 lvl, void *context, void **rv)
1024 {
1025         acpi_status status;
1026         int *action = context;
1027         acpi_object_type type = 0;
1028
1029         status = acpi_get_type(handle, &type);
1030         if (ACPI_FAILURE(status))
1031                 return (AE_OK);
1032
1033         if (type != ACPI_TYPE_PROCESSOR)
1034                 return (AE_OK);
1035
1036         switch (*action) {
1037         case INSTALL_NOTIFY_HANDLER:
1038                 acpi_install_notify_handler(handle,
1039                                             ACPI_SYSTEM_NOTIFY,
1040                                             acpi_processor_hotplug_notify,
1041                                             NULL);
1042                 break;
1043         case UNINSTALL_NOTIFY_HANDLER:
1044                 acpi_remove_notify_handler(handle,
1045                                            ACPI_SYSTEM_NOTIFY,
1046                                            acpi_processor_hotplug_notify);
1047                 break;
1048         default:
1049                 break;
1050         }
1051
1052         return (AE_OK);
1053 }
1054
1055 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1056 {
1057
1058         if (!is_processor_present(handle)) {
1059                 return AE_ERROR;
1060         }
1061
1062         if (acpi_map_lsapic(handle, p_cpu))
1063                 return AE_ERROR;
1064
1065         if (arch_register_cpu(*p_cpu)) {
1066                 acpi_unmap_lsapic(*p_cpu);
1067                 return AE_ERROR;
1068         }
1069
1070         return AE_OK;
1071 }
1072
1073 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1074 {
1075         if (cpu_online(pr->id))
1076                 cpu_down(pr->id);
1077
1078         arch_unregister_cpu(pr->id);
1079         acpi_unmap_lsapic(pr->id);
1080         return (0);
1081 }
1082 #else
1083 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1084 {
1085         return AE_ERROR;
1086 }
1087 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1088 {
1089         return (-EINVAL);
1090 }
1091 #endif
1092
1093 static
1094 void acpi_processor_install_hotplug_notify(void)
1095 {
1096 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1097         int action = INSTALL_NOTIFY_HANDLER;
1098         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1099                             ACPI_ROOT_OBJECT,
1100                             ACPI_UINT32_MAX,
1101                             processor_walk_namespace_cb, &action, NULL);
1102 #endif
1103         register_hotcpu_notifier(&acpi_cpu_notifier);
1104 }
1105
1106 static
1107 void acpi_processor_uninstall_hotplug_notify(void)
1108 {
1109 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1110         int action = UNINSTALL_NOTIFY_HANDLER;
1111         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1112                             ACPI_ROOT_OBJECT,
1113                             ACPI_UINT32_MAX,
1114                             processor_walk_namespace_cb, &action, NULL);
1115 #endif
1116         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1117 }
1118
1119 /*
1120  * We keep the driver loaded even when ACPI is not running.
1121  * This is needed for the powernow-k8 driver, that works even without
1122  * ACPI, but needs symbols from this driver
1123  */
1124
1125 static int __init acpi_processor_init(void)
1126 {
1127         int result = 0;
1128
1129         memset(&errata, 0, sizeof(errata));
1130
1131 #ifdef CONFIG_SMP
1132         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1133                                 (struct acpi_table_header **)&madt)))
1134                 madt = NULL;
1135 #endif
1136
1137         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1138         if (!acpi_processor_dir)
1139                 return -ENOMEM;
1140         acpi_processor_dir->owner = THIS_MODULE;
1141
1142         /*
1143          * Check whether the system is DMI table. If yes, OSPM
1144          * should not use mwait for CPU-states.
1145          */
1146         dmi_check_system(processor_idle_dmi_table);
1147         result = cpuidle_register_driver(&acpi_idle_driver);
1148         if (result < 0)
1149                 goto out_proc;
1150
1151         result = acpi_bus_register_driver(&acpi_processor_driver);
1152         if (result < 0)
1153                 goto out_cpuidle;
1154
1155         acpi_processor_install_hotplug_notify();
1156
1157         acpi_thermal_cpufreq_init();
1158
1159         acpi_processor_ppc_init();
1160
1161         acpi_processor_throttling_init();
1162
1163         return 0;
1164
1165 out_cpuidle:
1166         cpuidle_unregister_driver(&acpi_idle_driver);
1167
1168 out_proc:
1169         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1170
1171         return result;
1172 }
1173
1174 static void __exit acpi_processor_exit(void)
1175 {
1176         acpi_processor_ppc_exit();
1177
1178         acpi_thermal_cpufreq_exit();
1179
1180         acpi_processor_uninstall_hotplug_notify();
1181
1182         acpi_bus_unregister_driver(&acpi_processor_driver);
1183
1184         cpuidle_unregister_driver(&acpi_idle_driver);
1185
1186         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1187
1188         return;
1189 }
1190
1191 module_init(acpi_processor_init);
1192 module_exit(acpi_processor_exit);
1193
1194 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1195
1196 MODULE_ALIAS("processor");