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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_driver");
  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_remove(struct acpi_device *device, int type);
  85 #ifdef CONFIG_ACPI_PROCFS
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 #endif
  88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  91
  92
  93 static const struct acpi_device_id processor_device_ids[] = {
  94         {ACPI_PROCESSOR_OBJECT_HID, 0},
  95         {"ACPI0007", 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  99
 100 static struct acpi_driver acpi_processor_driver = {
 101         .name = "processor",
 102         .class = ACPI_PROCESSOR_CLASS,
 103         .ids = processor_device_ids,
 104         .ops = {
 105                 .add = acpi_processor_add,
 106                 .remove = acpi_processor_remove,
 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 #ifdef CONFIG_ACPI_PROCFS
 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 #endif
 124
 125 DEFINE_PER_CPU(struct acpi_processor *, processors);
 126 EXPORT_PER_CPU_SYMBOL(processors);
 127
 128 struct acpi_processor_errata errata __read_mostly;
 129
 130 /* --------------------------------------------------------------------------
 131                                 Errata Handling
 132    -------------------------------------------------------------------------- */
 133
 134 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 135 {
 136         u8 value1 = 0;
 137         u8 value2 = 0;
 138
 139
 140         if (!dev)
 141                 return -EINVAL;
 142
 143         /*
 144          * Note that 'dev' references the PIIX4 ACPI Controller.
 145          */
 146
 147         switch (dev->revision) {
 148         case 0:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 150                 break;
 151         case 1:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 153                 break;
 154         case 2:
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 156                 break;
 157         case 3:
 158                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 159                 break;
 160         default:
 161                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 162                 break;
 163         }
 164
 165         switch (dev->revision) {
 166
 167         case 0:         /* PIIX4 A-step */
 168         case 1:         /* PIIX4 B-step */
 169                 /*
 170                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 171                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 172                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 173                  * 2002 PIIX4 specification update.  Applies to only older
 174                  * PIIX4 models.
 175                  */
 176                 errata.piix4.throttle = 1;
 177
 178         case 2:         /* PIIX4E */
 179         case 3:         /* PIIX4M */
 180                 /*
 181                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 182                  * Livelock") from the January 2002 PIIX4 specification update.
 183                  * Applies to all PIIX4 models.
 184                  */
 185
 186                 /*
 187                  * BM-IDE
 188                  * ------
 189                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 190                  * Status register address.  We'll use this later to read
 191                  * each IDE controller's DMA status to make sure we catch all
 192                  * DMA activity.
 193                  */
 194                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 195                                      PCI_DEVICE_ID_INTEL_82371AB,
 196                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 197                 if (dev) {
 198                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 199                         pci_dev_put(dev);
 200                 }
 201
 202                 /*
 203                  * Type-F DMA
 204                  * ----------
 205                  * Find the PIIX4 ISA Controller and read the Motherboard
 206                  * DMA controller's status to see if Type-F (Fast) DMA mode
 207                  * is enabled (bit 7) on either channel.  Note that we'll
 208                  * disable C3 support if this is enabled, as some legacy
 209                  * devices won't operate well if fast DMA is disabled.
 210                  */
 211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 212                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 214                 if (dev) {
 215                         pci_read_config_byte(dev, 0x76, &value1);
 216                         pci_read_config_byte(dev, 0x77, &value2);
 217                         if ((value1 & 0x80) || (value2 & 0x80))
 218                                 errata.piix4.fdma = 1;
 219                         pci_dev_put(dev);
 220                 }
 221
 222                 break;
 223         }
 224
 225         if (errata.piix4.bmisx)
 226                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 227                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 228         if (errata.piix4.fdma)
 229                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 230                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 231
 232         return 0;
 233 }
 234
 235 static int acpi_processor_errata(struct acpi_processor *pr)
 236 {
 237         int result = 0;
 238         struct pci_dev *dev = NULL;
 239
 240
 241         if (!pr)
 242                 return -EINVAL;
 243
 244         /*
 245          * PIIX4
 246          */
 247         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 248                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 249                              PCI_ANY_ID, NULL);
 250         if (dev) {
 251                 result = acpi_processor_errata_piix4(dev);
 252                 pci_dev_put(dev);
 253         }
 254
 255         return result;
 256 }
 257
 258 /* --------------------------------------------------------------------------
 259                               FS Interface (/proc)
 260    -------------------------------------------------------------------------- */
 261
 262 #ifdef CONFIG_ACPI_PROCFS
 263 static struct proc_dir_entry *acpi_processor_dir = NULL;
 264
 265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 266 {
 267         struct acpi_processor *pr = seq->private;
 268
 269
 270         if (!pr)
 271                 goto end;
 272
 273         seq_printf(seq, "processor id:            %d\n"
 274                    "acpi id:                 %d\n"
 275                    "bus mastering control:   %s\n"
 276                    "power management:        %s\n"
 277                    "throttling control:      %s\n"
 278                    "limit interface:         %s\n",
 279                    pr->id,
 280                    pr->acpi_id,
 281                    pr->flags.bm_control ? "yes" : "no",
 282                    pr->flags.power ? "yes" : "no",
 283                    pr->flags.throttling ? "yes" : "no",
 284                    pr->flags.limit ? "yes" : "no");
 285
 286       end:
 287         return 0;
 288 }
 289
 290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 291 {
 292         return single_open(file, acpi_processor_info_seq_show,
 293                            PDE(inode)->data);
 294 }
 295
 296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 297 {
 298         struct proc_dir_entry *entry = NULL;
 299
 300
 301         if (!acpi_device_dir(device)) {
 302                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 303                                                      acpi_processor_dir);
 304                 if (!acpi_device_dir(device))
 305                         return -ENODEV;
 306         }
 307
 308         /* 'info' [R] */
 309         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 310                                  S_IRUGO, acpi_device_dir(device),
 311                                  &acpi_processor_info_fops,
 312                                  acpi_driver_data(device));
 313         if (!entry)
 314                 return -EIO;
 315
 316         /* 'throttling' [R/W] */
 317         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 318                                  S_IFREG | S_IRUGO | S_IWUSR,
 319                                  acpi_device_dir(device),
 320                                  &acpi_processor_throttling_fops,
 321                                  acpi_driver_data(device));
 322         if (!entry)
 323                 return -EIO;
 324
 325         /* 'limit' [R/W] */
 326         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 327                                  S_IFREG | S_IRUGO | S_IWUSR,
 328                                  acpi_device_dir(device),
 329                                  &acpi_processor_limit_fops,
 330                                  acpi_driver_data(device));
 331         if (!entry)
 332                 return -EIO;
 333         return 0;
 334 }
 335 static int acpi_processor_remove_fs(struct acpi_device *device)
 336 {
 337
 338         if (acpi_device_dir(device)) {
 339                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 340                                   acpi_device_dir(device));
 341                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 342                                   acpi_device_dir(device));
 343                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 344                                   acpi_device_dir(device));
 345                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 346                 acpi_device_dir(device) = NULL;
 347         }
 348
 349         return 0;
 350 }
 351 #else
 352 static inline int acpi_processor_add_fs(struct acpi_device *device)
 353 {
 354         return 0;
 355 }
 356 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 357 {
 358         return 0;
 359 }
 360 #endif
 361
 362 /* Use the acpiid in MADT to map cpus in case of SMP */
 363
 364 #ifndef CONFIG_SMP
 365 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 366 #else
 367
 368 static struct acpi_table_madt *madt;
 369
 370 static int map_lapic_id(struct acpi_subtable_header *entry,
 371                  u32 acpi_id, int *apic_id)
 372 {
 373         struct acpi_madt_local_apic *lapic =
 374                 (struct acpi_madt_local_apic *)entry;
 375         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 376             lapic->processor_id == acpi_id) {
 377                 *apic_id = lapic->id;
 378                 return 1;
 379         }
 380         return 0;
 381 }
 382
 383 static int map_x2apic_id(struct acpi_subtable_header *entry,
 384                          int device_declaration, u32 acpi_id, int *apic_id)
 385 {
 386         struct acpi_madt_local_x2apic *apic =
 387                 (struct acpi_madt_local_x2apic *)entry;
 388         u32 tmp = apic->local_apic_id;
 389
 390         /* Only check enabled APICs*/
 391         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 392                 return 0;
 393
 394         /* Device statement declaration type */
 395         if (device_declaration) {
 396                 if (apic->uid == acpi_id)
 397                         goto found;
 398         }
 399
 400         return 0;
 401 found:
 402         *apic_id = tmp;
 403         return 1;
 404 }
 405
 406 static int map_lsapic_id(struct acpi_subtable_header *entry,
 407                 int device_declaration, u32 acpi_id, int *apic_id)
 408 {
 409         struct acpi_madt_local_sapic *lsapic =
 410                 (struct acpi_madt_local_sapic *)entry;
 411         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 412
 413         /* Only check enabled APICs*/
 414         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 415                 return 0;
 416
 417         /* Device statement declaration type */
 418         if (device_declaration) {
 419                 if (entry->length < 16)
 420                         printk(KERN_ERR PREFIX
 421                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 422                             tmp);
 423                 else if (lsapic->uid == acpi_id)
 424                         goto found;
 425         /* Processor statement declaration type */
 426         } else if (lsapic->processor_id == acpi_id)
 427                 goto found;
 428
 429         return 0;
 430 found:
 431         *apic_id = tmp;
 432         return 1;
 433 }
 434
 435 static int map_madt_entry(int type, u32 acpi_id)
 436 {
 437         unsigned long madt_end, entry;
 438         int apic_id = -1;
 439
 440         if (!madt)
 441                 return apic_id;
 442
 443         entry = (unsigned long)madt;
 444         madt_end = entry + madt->header.length;
 445
 446         /* Parse all entries looking for a match. */
 447
 448         entry += sizeof(struct acpi_table_madt);
 449         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 450                 struct acpi_subtable_header *header =
 451                         (struct acpi_subtable_header *)entry;
 452                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 453                         if (map_lapic_id(header, acpi_id, &apic_id))
 454                                 break;
 455                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 456                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 457                                 break;
 458                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 459                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 460                                 break;
 461                 }
 462                 entry += header->length;
 463         }
 464         return apic_id;
 465 }
 466
 467 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 468 {
 469         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 470         union acpi_object *obj;
 471         struct acpi_subtable_header *header;
 472         int apic_id = -1;
 473
 474         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 475                 goto exit;
 476
 477         if (!buffer.length || !buffer.pointer)
 478                 goto exit;
 479
 480         obj = buffer.pointer;
 481         if (obj->type != ACPI_TYPE_BUFFER ||
 482             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 483                 goto exit;
 484         }
 485
 486         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 487         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 488                 map_lapic_id(header, acpi_id, &apic_id);
 489         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 490                 map_lsapic_id(header, type, acpi_id, &apic_id);
 491         }
 492
 493 exit:
 494         if (buffer.pointer)
 495                 kfree(buffer.pointer);
 496         return apic_id;
 497 }
 498
 499 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 500 {
 501         int i;
 502         int apic_id = -1;
 503
 504         apic_id = map_mat_entry(handle, type, acpi_id);
 505         if (apic_id == -1)
 506                 apic_id = map_madt_entry(type, acpi_id);
 507         if (apic_id == -1)
 508                 return apic_id;
 509
 510         for_each_possible_cpu(i) {
 511                 if (cpu_physical_id(i) == apic_id)
 512                         return i;
 513         }
 514         return -1;
 515 }
 516 #endif
 517
 518 /* --------------------------------------------------------------------------
 519                                  Driver Interface
 520    -------------------------------------------------------------------------- */
 521
 522 static int acpi_processor_get_info(struct acpi_device *device)
 523 {
 524         acpi_status status = 0;
 525         union acpi_object object = { 0 };
 526         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 527         struct acpi_processor *pr;
 528         int cpu_index, device_declaration = 0;
 529         static int cpu0_initialized;
 530
 531         pr = acpi_driver_data(device);
 532         if (!pr)
 533                 return -EINVAL;
 534
 535         if (num_online_cpus() > 1)
 536                 errata.smp = TRUE;
 537
 538         acpi_processor_errata(pr);
 539
 540         /*
 541          * Check to see if we have bus mastering arbitration control.  This
 542          * is required for proper C3 usage (to maintain cache coherency).
 543          */
 544         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 545                 pr->flags.bm_control = 1;
 546                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 547                                   "Bus mastering arbitration control present\n"));
 548         } else
 549                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 550                                   "No bus mastering arbitration control\n"));
 551
 552         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 553                 /* Declared with "Processor" statement; match ProcessorID */
 554                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 555                 if (ACPI_FAILURE(status)) {
 556                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 557                         return -ENODEV;
 558                 }
 559
 560                 /*
 561                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 562                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 563                  *      arch/xxx/acpi.c
 564                  */
 565                 pr->acpi_id = object.processor.proc_id;
 566         } else {
 567                 /*
 568                  * Declared with "Device" statement; match _UID.
 569                  * Note that we don't handle string _UIDs yet.
 570                  */
 571                 unsigned long long value;
 572                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 573                                                 NULL, &value);
 574                 if (ACPI_FAILURE(status)) {
 575                         printk(KERN_ERR PREFIX
 576                             "Evaluating processor _UID [%#x]\n", status);
 577                         return -ENODEV;
 578                 }
 579                 device_declaration = 1;
 580                 pr->acpi_id = value;
 581         }
 582         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 583
 584         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 585         if (!cpu0_initialized && (cpu_index == -1) &&
 586             (num_online_cpus() == 1)) {
 587                 cpu_index = 0;
 588         }
 589
 590         cpu0_initialized = 1;
 591
 592         pr->id = cpu_index;
 593
 594         /*
 595          *  Extra Processor objects may be enumerated on MP systems with
 596          *  less than the max # of CPUs. They should be ignored _iff
 597          *  they are physically not present.
 598          */
 599         if (pr->id == -1) {
 600                 if (ACPI_FAILURE
 601                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 602                         return -ENODEV;
 603                 }
 604         }
 605         /*
 606          * On some boxes several processors use the same processor bus id.
 607          * But they are located in different scope. For example:
 608          * \_SB.SCK0.CPU0
 609          * \_SB.SCK1.CPU0
 610          * Rename the processor device bus id. And the new bus id will be
 611          * generated as the following format:
 612          * CPU+CPU ID.
 613          */
 614         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 615         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 616                           pr->acpi_id));
 617
 618         if (!object.processor.pblk_address)
 619                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 620         else if (object.processor.pblk_length != 6)
 621                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 622                             object.processor.pblk_length);
 623         else {
 624                 pr->throttling.address = object.processor.pblk_address;
 625                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 626                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 627
 628                 pr->pblk = object.processor.pblk_address;
 629
 630                 /*
 631                  * We don't care about error returns - we just try to mark
 632                  * these reserved so that nobody else is confused into thinking
 633                  * that this region might be unused..
 634                  *
 635                  * (In particular, allocating the IO range for Cardbus)
 636                  */
 637                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 638         }
 639
 640         /*
 641          * If ACPI describes a slot number for this CPU, we can use it
 642          * ensure we get the right value in the "physical id" field
 643          * of /proc/cpuinfo
 644          */
 645         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 646         if (ACPI_SUCCESS(status))
 647                 arch_fix_phys_package_id(pr->id, object.integer.value);
 648
 649         return 0;
 650 }
 651
 652 static DEFINE_PER_CPU(void *, processor_device_array);
 653
 654 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 655 {
 656         struct acpi_processor *pr = acpi_driver_data(device);
 657         int saved;
 658
 659         if (!pr)
 660                 return;
 661
 662         switch (event) {
 663         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 664                 saved = pr->performance_platform_limit;
 665                 acpi_processor_ppc_has_changed(pr, 1);
 666                 if (saved == pr->performance_platform_limit)
 667                         break;
 668                 acpi_bus_generate_proc_event(device, event,
 669                                         pr->performance_platform_limit);
 670                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 671                                                   dev_name(&device->dev), event,
 672                                                   pr->performance_platform_limit);
 673                 break;
 674         case ACPI_PROCESSOR_NOTIFY_POWER:
 675                 acpi_processor_cst_has_changed(pr);
 676                 acpi_bus_generate_proc_event(device, event, 0);
 677                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 678                                                   dev_name(&device->dev), event, 0);
 679                 break;
 680         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 681                 acpi_processor_tstate_has_changed(pr);
 682                 acpi_bus_generate_proc_event(device, event, 0);
 683                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 684                                                   dev_name(&device->dev), event, 0);
 685         default:
 686                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 687                                   "Unsupported event [0x%x]\n", event));
 688                 break;
 689         }
 690
 691         return;
 692 }
 693
 694 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 695                 unsigned long action, void *hcpu)
 696 {
 697         unsigned int cpu = (unsigned long)hcpu;
 698         struct acpi_processor *pr = per_cpu(processors, cpu);
 699
 700         if (action == CPU_ONLINE && pr) {
 701                 acpi_processor_ppc_has_changed(pr, 0);
 702                 acpi_processor_cst_has_changed(pr);
 703                 acpi_processor_tstate_has_changed(pr);
 704         }
 705         return NOTIFY_OK;
 706 }
 707
 708 static struct notifier_block acpi_cpu_notifier =
 709 {
 710             .notifier_call = acpi_cpu_soft_notify,
 711 };
 712
 713 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 714 {
 715         struct acpi_processor *pr = NULL;
 716         int result = 0;
 717         struct sys_device *sysdev;
 718
 719         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 720         if (!pr)
 721                 return -ENOMEM;
 722
 723         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 724                 kfree(pr);
 725                 return -ENOMEM;
 726         }
 727
 728         pr->handle = device->handle;
 729         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 730         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 731         device->driver_data = pr;
 732
 733         result = acpi_processor_get_info(device);
 734         if (result) {
 735                 /* Processor is physically not present */
 736                 return 0;
 737         }
 738
 739         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 740
 741         /*
 742          * Buggy BIOS check
 743          * ACPI id of processors can be reported wrongly by the BIOS.
 744          * Don't trust it blindly
 745          */
 746         if (per_cpu(processor_device_array, pr->id) != NULL &&
 747             per_cpu(processor_device_array, pr->id) != device) {
 748                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 749                         "for the processor\n");
 750                 result = -ENODEV;
 751                 goto err_free_cpumask;
 752         }
 753         per_cpu(processor_device_array, pr->id) = device;
 754
 755         per_cpu(processors, pr->id) = pr;
 756
 757         result = acpi_processor_add_fs(device);
 758         if (result)
 759                 goto err_free_cpumask;
 760
 761         sysdev = get_cpu_sysdev(pr->id);
 762         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 763                 result = -EFAULT;
 764                 goto err_remove_fs;
 765         }
 766
 767         /* _PDC call should be done before doing anything else (if reqd.). */
 768         acpi_processor_set_pdc(pr->handle);
 769
 770 #ifdef CONFIG_CPU_FREQ
 771         acpi_processor_ppc_has_changed(pr, 0);
 772 #endif
 773         acpi_processor_get_throttling_info(pr);
 774         acpi_processor_get_limit_info(pr);
 775
 776
 777         acpi_processor_power_init(pr, device);
 778
 779         pr->cdev = thermal_cooling_device_register("Processor", device,
 780                                                 &processor_cooling_ops);
 781         if (IS_ERR(pr->cdev)) {
 782                 result = PTR_ERR(pr->cdev);
 783                 goto err_power_exit;
 784         }
 785
 786         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 787                  pr->cdev->id);
 788
 789         result = sysfs_create_link(&device->dev.kobj,
 790                                    &pr->cdev->device.kobj,
 791                                    "thermal_cooling");
 792         if (result) {
 793                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 794                 goto err_thermal_unregister;
 795         }
 796         result = sysfs_create_link(&pr->cdev->device.kobj,
 797                                    &device->dev.kobj,
 798                                    "device");
 799         if (result) {
 800                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 801                 goto err_remove_sysfs;
 802         }
 803
 804         return 0;
 805
 806 err_remove_sysfs:
 807         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 808 err_thermal_unregister:
 809         thermal_cooling_device_unregister(pr->cdev);
 810 err_power_exit:
 811         acpi_processor_power_exit(pr, device);
 812 err_remove_fs:
 813         acpi_processor_remove_fs(device);
 814 err_free_cpumask:
 815         free_cpumask_var(pr->throttling.shared_cpu_map);
 816
 817         return result;
 818 }
 819
 820 static int acpi_processor_remove(struct acpi_device *device, int type)
 821 {
 822         struct acpi_processor *pr = NULL;
 823
 824
 825         if (!device || !acpi_driver_data(device))
 826                 return -EINVAL;
 827
 828         pr = acpi_driver_data(device);
 829
 830         if (pr->id >= nr_cpu_ids)
 831                 goto free;
 832
 833         if (type == ACPI_BUS_REMOVAL_EJECT) {
 834                 if (acpi_processor_handle_eject(pr))
 835                         return -EINVAL;
 836         }
 837
 838         acpi_processor_power_exit(pr, device);
 839
 840         sysfs_remove_link(&device->dev.kobj, "sysdev");
 841
 842         acpi_processor_remove_fs(device);
 843
 844         if (pr->cdev) {
 845                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 846                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 847                 thermal_cooling_device_unregister(pr->cdev);
 848                 pr->cdev = NULL;
 849         }
 850
 851         per_cpu(processors, pr->id) = NULL;
 852         per_cpu(processor_device_array, pr->id) = NULL;
 853
 854 free:
 855         free_cpumask_var(pr->throttling.shared_cpu_map);
 856         kfree(pr);
 857
 858         return 0;
 859 }
 860
 861 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 862 /****************************************************************************
 863  *      Acpi processor hotplug support                                      *
 864  ****************************************************************************/
 865
 866 static int is_processor_present(acpi_handle handle)
 867 {
 868         acpi_status status;
 869         unsigned long long sta = 0;
 870
 871
 872         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 873
 874         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 875                 return 1;
 876
 877         /*
 878          * _STA is mandatory for a processor that supports hot plug
 879          */
 880         if (status == AE_NOT_FOUND)
 881                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 882                                 "Processor does not support hot plug\n"));
 883         else
 884                 ACPI_EXCEPTION((AE_INFO, status,
 885                                 "Processor Device is not present"));
 886         return 0;
 887 }
 888
 889 static
 890 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 891 {
 892         acpi_handle phandle;
 893         struct acpi_device *pdev;
 894
 895
 896         if (acpi_get_parent(handle, &phandle)) {
 897                 return -ENODEV;
 898         }
 899
 900         if (acpi_bus_get_device(phandle, &pdev)) {
 901                 return -ENODEV;
 902         }
 903
 904         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 905                 return -ENODEV;
 906         }
 907
 908         return 0;
 909 }
 910
 911 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 912                                                 u32 event, void *data)
 913 {
 914         struct acpi_processor *pr;
 915         struct acpi_device *device = NULL;
 916         int result;
 917
 918
 919         switch (event) {
 920         case ACPI_NOTIFY_BUS_CHECK:
 921         case ACPI_NOTIFY_DEVICE_CHECK:
 922                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 923                 "Processor driver received %s event\n",
 924                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 925                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 926
 927                 if (!is_processor_present(handle))
 928                         break;
 929
 930                 if (acpi_bus_get_device(handle, &device)) {
 931                         result = acpi_processor_device_add(handle, &device);
 932                         if (result)
 933                                 printk(KERN_ERR PREFIX
 934                                             "Unable to add the device\n");
 935                         break;
 936                 }
 937                 break;
 938         case ACPI_NOTIFY_EJECT_REQUEST:
 939                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 940                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 941
 942                 if (acpi_bus_get_device(handle, &device)) {
 943                         printk(KERN_ERR PREFIX
 944                                     "Device don't exist, dropping EJECT\n");
 945                         break;
 946                 }
 947                 pr = acpi_driver_data(device);
 948                 if (!pr) {
 949                         printk(KERN_ERR PREFIX
 950                                     "Driver data is NULL, dropping EJECT\n");
 951                         return;
 952                 }
 953                 break;
 954         default:
 955                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 956                                   "Unsupported event [0x%x]\n", event));
 957                 break;
 958         }
 959
 960         return;
 961 }
 962
 963 static acpi_status
 964 processor_walk_namespace_cb(acpi_handle handle,
 965                             u32 lvl, void *context, void **rv)
 966 {
 967         acpi_status status;
 968         int *action = context;
 969         acpi_object_type type = 0;
 970
 971         status = acpi_get_type(handle, &type);
 972         if (ACPI_FAILURE(status))
 973                 return (AE_OK);
 974
 975         if (type != ACPI_TYPE_PROCESSOR)
 976                 return (AE_OK);
 977
 978         switch (*action) {
 979         case INSTALL_NOTIFY_HANDLER:
 980                 acpi_install_notify_handler(handle,
 981                                             ACPI_SYSTEM_NOTIFY,
 982                                             acpi_processor_hotplug_notify,
 983                                             NULL);
 984                 break;
 985         case UNINSTALL_NOTIFY_HANDLER:
 986                 acpi_remove_notify_handler(handle,
 987                                            ACPI_SYSTEM_NOTIFY,
 988                                            acpi_processor_hotplug_notify);
 989                 break;
 990         default:
 991                 break;
 992         }
 993
 994         return (AE_OK);
 995 }
 996
 997 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 998 {
 999
1000         if (!is_processor_present(handle)) {
1001                 return AE_ERROR;
1002         }
1003
1004         if (acpi_map_lsapic(handle, p_cpu))
1005                 return AE_ERROR;
1006
1007         if (arch_register_cpu(*p_cpu)) {
1008                 acpi_unmap_lsapic(*p_cpu);
1009                 return AE_ERROR;
1010         }
1011
1012         return AE_OK;
1013 }
1014
1015 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1016 {
1017         if (cpu_online(pr->id))
1018                 cpu_down(pr->id);
1019
1020         arch_unregister_cpu(pr->id);
1021         acpi_unmap_lsapic(pr->id);
1022         return (0);
1023 }
1024 #else
1025 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1026 {
1027         return AE_ERROR;
1028 }
1029 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1030 {
1031         return (-EINVAL);
1032 }
1033 #endif
1034
1035 static
1036 void acpi_processor_install_hotplug_notify(void)
1037 {
1038 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1039         int action = INSTALL_NOTIFY_HANDLER;
1040         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1041                             ACPI_ROOT_OBJECT,
1042                             ACPI_UINT32_MAX,
1043                             processor_walk_namespace_cb, NULL, &action, NULL);
1044 #endif
1045         register_hotcpu_notifier(&acpi_cpu_notifier);
1046 }
1047
1048 static
1049 void acpi_processor_uninstall_hotplug_notify(void)
1050 {
1051 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1052         int action = UNINSTALL_NOTIFY_HANDLER;
1053         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1054                             ACPI_ROOT_OBJECT,
1055                             ACPI_UINT32_MAX,
1056                             processor_walk_namespace_cb, NULL, &action, NULL);
1057 #endif
1058         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1059 }
1060
1061 /*
1062  * We keep the driver loaded even when ACPI is not running.
1063  * This is needed for the powernow-k8 driver, that works even without
1064  * ACPI, but needs symbols from this driver
1065  */
1066
1067 static int __init acpi_processor_init(void)
1068 {
1069         int result = 0;
1070
1071         if (acpi_disabled)
1072                 return 0;
1073
1074         memset(&errata, 0, sizeof(errata));
1075
1076 #ifdef CONFIG_SMP
1077         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1078                                 (struct acpi_table_header **)&madt)))
1079                 madt = NULL;
1080 #endif
1081 #ifdef CONFIG_ACPI_PROCFS
1082         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1083         if (!acpi_processor_dir)
1084                 return -ENOMEM;
1085 #endif
1086         result = cpuidle_register_driver(&acpi_idle_driver);
1087         if (result < 0)
1088                 goto out_proc;
1089
1090         result = acpi_bus_register_driver(&acpi_processor_driver);
1091         if (result < 0)
1092                 goto out_cpuidle;
1093
1094         acpi_processor_install_hotplug_notify();
1095
1096         acpi_thermal_cpufreq_init();
1097
1098         acpi_processor_ppc_init();
1099
1100         acpi_processor_throttling_init();
1101
1102         return 0;
1103
1104 out_cpuidle:
1105         cpuidle_unregister_driver(&acpi_idle_driver);
1106
1107 out_proc:
1108 #ifdef CONFIG_ACPI_PROCFS
1109         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1110 #endif
1111
1112         return result;
1113 }
1114
1115 static void __exit acpi_processor_exit(void)
1116 {
1117         if (acpi_disabled)
1118                 return;
1119
1120         acpi_processor_ppc_exit();
1121
1122         acpi_thermal_cpufreq_exit();
1123
1124         acpi_processor_uninstall_hotplug_notify();
1125
1126         acpi_bus_unregister_driver(&acpi_processor_driver);
1127
1128         cpuidle_unregister_driver(&acpi_idle_driver);
1129
1130 #ifdef CONFIG_ACPI_PROCFS
1131         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1132 #endif
1133
1134         return;
1135 }
1136
1137 module_init(acpi_processor_init);
1138 module_exit(acpi_processor_exit);
1139
1140 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1141
1142 MODULE_ALIAS("processor");