SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/acpi/processor_core.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define PREFIX "ACPI: "
  63
  64 #define ACPI_PROCESSOR_CLASS            "processor"
  65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  66 #define ACPI_PROCESSOR_FILE_INFO        "info"
  67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  72
  73 #define ACPI_PROCESSOR_LIMIT_USER       0
  74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("processor_core");
  78
  79 MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION("ACPI Processor Driver");
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_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 static int set_no_mwait(const struct dmi_system_id *id)
 130 {
 131         printk(KERN_NOTICE PREFIX "%s detected - "
 132                 "disabling mwait for CPU C-states\n", id->ident);
 133         idle_nomwait = 1;
 134         return 0;
 135 }
 136
 137 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 138         {
 139         set_no_mwait, "IFL91 board", {
 140         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 141         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 142         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 143         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 144         {
 145         set_no_mwait, "Extensa 5220", {
 146         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 147         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 148         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 149         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 150         {},
 151 };
 152
 153 /* --------------------------------------------------------------------------
 154                                 Errata Handling
 155    -------------------------------------------------------------------------- */
 156
 157 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 158 {
 159         u8 value1 = 0;
 160         u8 value2 = 0;
 161
 162
 163         if (!dev)
 164                 return -EINVAL;
 165
 166         /*
 167          * Note that 'dev' references the PIIX4 ACPI Controller.
 168          */
 169
 170         switch (dev->revision) {
 171         case 0:
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 173                 break;
 174         case 1:
 175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 176                 break;
 177         case 2:
 178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 179                 break;
 180         case 3:
 181                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 182                 break;
 183         default:
 184                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 185                 break;
 186         }
 187
 188         switch (dev->revision) {
 189
 190         case 0:         /* PIIX4 A-step */
 191         case 1:         /* PIIX4 B-step */
 192                 /*
 193                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 194                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 195                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 196                  * 2002 PIIX4 specification update.  Applies to only older
 197                  * PIIX4 models.
 198                  */
 199                 errata.piix4.throttle = 1;
 200
 201         case 2:         /* PIIX4E */
 202         case 3:         /* PIIX4M */
 203                 /*
 204                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 205                  * Livelock") from the January 2002 PIIX4 specification update.
 206                  * Applies to all PIIX4 models.
 207                  */
 208
 209                 /*
 210                  * BM-IDE
 211                  * ------
 212                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 213                  * Status register address.  We'll use this later to read
 214                  * each IDE controller's DMA status to make sure we catch all
 215                  * DMA activity.
 216                  */
 217                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 218                                      PCI_DEVICE_ID_INTEL_82371AB,
 219                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 220                 if (dev) {
 221                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 222                         pci_dev_put(dev);
 223                 }
 224
 225                 /*
 226                  * Type-F DMA
 227                  * ----------
 228                  * Find the PIIX4 ISA Controller and read the Motherboard
 229                  * DMA controller's status to see if Type-F (Fast) DMA mode
 230                  * is enabled (bit 7) on either channel.  Note that we'll
 231                  * disable C3 support if this is enabled, as some legacy
 232                  * devices won't operate well if fast DMA is disabled.
 233                  */
 234                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 235                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 236                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 237                 if (dev) {
 238                         pci_read_config_byte(dev, 0x76, &value1);
 239                         pci_read_config_byte(dev, 0x77, &value2);
 240                         if ((value1 & 0x80) || (value2 & 0x80))
 241                                 errata.piix4.fdma = 1;
 242                         pci_dev_put(dev);
 243                 }
 244
 245                 break;
 246         }
 247
 248         if (errata.piix4.bmisx)
 249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 250                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 251         if (errata.piix4.fdma)
 252                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 253                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 254
 255         return 0;
 256 }
 257
 258 static int acpi_processor_errata(struct acpi_processor *pr)
 259 {
 260         int result = 0;
 261         struct pci_dev *dev = NULL;
 262
 263
 264         if (!pr)
 265                 return -EINVAL;
 266
 267         /*
 268          * PIIX4
 269          */
 270         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 271                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 272                              PCI_ANY_ID, NULL);
 273         if (dev) {
 274                 result = acpi_processor_errata_piix4(dev);
 275                 pci_dev_put(dev);
 276         }
 277
 278         return result;
 279 }
 280
 281 /* --------------------------------------------------------------------------
 282                               Common ACPI processor functions
 283    -------------------------------------------------------------------------- */
 284
 285 /*
 286  * _PDC is required for a BIOS-OS handshake for most of the newer
 287  * ACPI processor features.
 288  */
 289 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 290 {
 291         struct acpi_object_list *pdc_in = pr->pdc;
 292         acpi_status status = AE_OK;
 293
 294
 295         if (!pdc_in)
 296                 return status;
 297         if (idle_nomwait) {
 298                 /*
 299                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 300                  * mode will be disabled in the parameter of _PDC object.
 301                  * Of course C1_FFH access mode will also be disabled.
 302                  */
 303                 union acpi_object *obj;
 304                 u32 *buffer = NULL;
 305
 306                 obj = pdc_in->pointer;
 307                 buffer = (u32 *)(obj->buffer.pointer);
 308                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 309
 310         }
 311         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 312
 313         if (ACPI_FAILURE(status))
 314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 315                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 316
 317         return status;
 318 }
 319
 320 /* --------------------------------------------------------------------------
 321                               FS Interface (/proc)
 322    -------------------------------------------------------------------------- */
 323
 324 #ifdef CONFIG_ACPI_PROCFS
 325 static struct proc_dir_entry *acpi_processor_dir = NULL;
 326
 327 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 328 {
 329         struct acpi_processor *pr = seq->private;
 330
 331
 332         if (!pr)
 333                 goto end;
 334
 335         seq_printf(seq, "processor id:            %d\n"
 336                    "acpi id:                 %d\n"
 337                    "bus mastering control:   %s\n"
 338                    "power management:        %s\n"
 339                    "throttling control:      %s\n"
 340                    "limit interface:         %s\n",
 341                    pr->id,
 342                    pr->acpi_id,
 343                    pr->flags.bm_control ? "yes" : "no",
 344                    pr->flags.power ? "yes" : "no",
 345                    pr->flags.throttling ? "yes" : "no",
 346                    pr->flags.limit ? "yes" : "no");
 347
 348       end:
 349         return 0;
 350 }
 351
 352 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 353 {
 354         return single_open(file, acpi_processor_info_seq_show,
 355                            PDE(inode)->data);
 356 }
 357
 358 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 359 {
 360         struct proc_dir_entry *entry = NULL;
 361
 362
 363         if (!acpi_device_dir(device)) {
 364                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 365                                                      acpi_processor_dir);
 366                 if (!acpi_device_dir(device))
 367                         return -ENODEV;
 368         }
 369
 370         /* 'info' [R] */
 371         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 372                                  S_IRUGO, acpi_device_dir(device),
 373                                  &acpi_processor_info_fops,
 374                                  acpi_driver_data(device));
 375         if (!entry)
 376                 return -EIO;
 377
 378         /* 'throttling' [R/W] */
 379         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 380                                  S_IFREG | S_IRUGO | S_IWUSR,
 381                                  acpi_device_dir(device),
 382                                  &acpi_processor_throttling_fops,
 383                                  acpi_driver_data(device));
 384         if (!entry)
 385                 return -EIO;
 386
 387         /* 'limit' [R/W] */
 388         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 389                                  S_IFREG | S_IRUGO | S_IWUSR,
 390                                  acpi_device_dir(device),
 391                                  &acpi_processor_limit_fops,
 392                                  acpi_driver_data(device));
 393         if (!entry)
 394                 return -EIO;
 395         return 0;
 396 }
 397 static int acpi_processor_remove_fs(struct acpi_device *device)
 398 {
 399
 400         if (acpi_device_dir(device)) {
 401                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 402                                   acpi_device_dir(device));
 403                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 404                                   acpi_device_dir(device));
 405                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 406                                   acpi_device_dir(device));
 407                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 408                 acpi_device_dir(device) = NULL;
 409         }
 410
 411         return 0;
 412 }
 413 #else
 414 static inline int acpi_processor_add_fs(struct acpi_device *device)
 415 {
 416         return 0;
 417 }
 418 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 419 {
 420         return 0;
 421 }
 422 #endif
 423
 424 /* Use the acpiid in MADT to map cpus in case of SMP */
 425
 426 #ifndef CONFIG_SMP
 427 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 428 #else
 429
 430 static struct acpi_table_madt *madt;
 431
 432 static int map_lapic_id(struct acpi_subtable_header *entry,
 433                  u32 acpi_id, int *apic_id)
 434 {
 435         struct acpi_madt_local_apic *lapic =
 436                 (struct acpi_madt_local_apic *)entry;
 437         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 438             lapic->processor_id == acpi_id) {
 439                 *apic_id = lapic->id;
 440                 return 1;
 441         }
 442         return 0;
 443 }
 444
 445 static int map_x2apic_id(struct acpi_subtable_header *entry,
 446                          int device_declaration, u32 acpi_id, int *apic_id)
 447 {
 448         struct acpi_madt_local_x2apic *apic =
 449                 (struct acpi_madt_local_x2apic *)entry;
 450         u32 tmp = apic->local_apic_id;
 451
 452         /* Only check enabled APICs*/
 453         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 454                 return 0;
 455
 456         /* Device statement declaration type */
 457         if (device_declaration) {
 458                 if (apic->uid == acpi_id)
 459                         goto found;
 460         }
 461
 462         return 0;
 463 found:
 464         *apic_id = tmp;
 465         return 1;
 466 }
 467
 468 static int map_lsapic_id(struct acpi_subtable_header *entry,
 469                 int device_declaration, u32 acpi_id, int *apic_id)
 470 {
 471         struct acpi_madt_local_sapic *lsapic =
 472                 (struct acpi_madt_local_sapic *)entry;
 473         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 474
 475         /* Only check enabled APICs*/
 476         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 477                 return 0;
 478
 479         /* Device statement declaration type */
 480         if (device_declaration) {
 481                 if (entry->length < 16)
 482                         printk(KERN_ERR PREFIX
 483                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 484                             tmp);
 485                 else if (lsapic->uid == acpi_id)
 486                         goto found;
 487         /* Processor statement declaration type */
 488         } else if (lsapic->processor_id == acpi_id)
 489                 goto found;
 490
 491         return 0;
 492 found:
 493         *apic_id = tmp;
 494         return 1;
 495 }
 496
 497 static int map_madt_entry(int type, u32 acpi_id)
 498 {
 499         unsigned long madt_end, entry;
 500         int apic_id = -1;
 501
 502         if (!madt)
 503                 return apic_id;
 504
 505         entry = (unsigned long)madt;
 506         madt_end = entry + madt->header.length;
 507
 508         /* Parse all entries looking for a match. */
 509
 510         entry += sizeof(struct acpi_table_madt);
 511         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 512                 struct acpi_subtable_header *header =
 513                         (struct acpi_subtable_header *)entry;
 514                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 515                         if (map_lapic_id(header, acpi_id, &apic_id))
 516                                 break;
 517                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 518                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 519                                 break;
 520                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 521                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 522                                 break;
 523                 }
 524                 entry += header->length;
 525         }
 526         return apic_id;
 527 }
 528
 529 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 530 {
 531         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 532         union acpi_object *obj;
 533         struct acpi_subtable_header *header;
 534         int apic_id = -1;
 535
 536         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 537                 goto exit;
 538
 539         if (!buffer.length || !buffer.pointer)
 540                 goto exit;
 541
 542         obj = buffer.pointer;
 543         if (obj->type != ACPI_TYPE_BUFFER ||
 544             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 545                 goto exit;
 546         }
 547
 548         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 549         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 550                 map_lapic_id(header, acpi_id, &apic_id);
 551         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 552                 map_lsapic_id(header, type, acpi_id, &apic_id);
 553         }
 554
 555 exit:
 556         if (buffer.pointer)
 557                 kfree(buffer.pointer);
 558         return apic_id;
 559 }
 560
 561 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 562 {
 563         int i;
 564         int apic_id = -1;
 565
 566         apic_id = map_mat_entry(handle, type, acpi_id);
 567         if (apic_id == -1)
 568                 apic_id = map_madt_entry(type, acpi_id);
 569         if (apic_id == -1)
 570                 return apic_id;
 571
 572         for_each_possible_cpu(i) {
 573                 if (cpu_physical_id(i) == apic_id)
 574                         return i;
 575         }
 576         return -1;
 577 }
 578 #endif
 579
 580 /* --------------------------------------------------------------------------
 581                                  Driver Interface
 582    -------------------------------------------------------------------------- */
 583
 584 static int acpi_processor_get_info(struct acpi_device *device)
 585 {
 586         acpi_status status = 0;
 587         union acpi_object object = { 0 };
 588         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 589         struct acpi_processor *pr;
 590         int cpu_index, device_declaration = 0;
 591         static int cpu0_initialized;
 592
 593         pr = acpi_driver_data(device);
 594         if (!pr)
 595                 return -EINVAL;
 596
 597         if (num_online_cpus() > 1)
 598                 errata.smp = TRUE;
 599
 600         acpi_processor_errata(pr);
 601
 602         /*
 603          * Check to see if we have bus mastering arbitration control.  This
 604          * is required for proper C3 usage (to maintain cache coherency).
 605          */
 606         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 607                 pr->flags.bm_control = 1;
 608                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 609                                   "Bus mastering arbitration control present\n"));
 610         } else
 611                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 612                                   "No bus mastering arbitration control\n"));
 613
 614         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 615                 /* Declared with "Processor" statement; match ProcessorID */
 616                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 617                 if (ACPI_FAILURE(status)) {
 618                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 619                         return -ENODEV;
 620                 }
 621
 622                 /*
 623                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 624                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 625                  *      arch/xxx/acpi.c
 626                  */
 627                 pr->acpi_id = object.processor.proc_id;
 628         } else {
 629                 /*
 630                  * Declared with "Device" statement; match _UID.
 631                  * Note that we don't handle string _UIDs yet.
 632                  */
 633                 unsigned long long value;
 634                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 635                                                 NULL, &value);
 636                 if (ACPI_FAILURE(status)) {
 637                         printk(KERN_ERR PREFIX
 638                             "Evaluating processor _UID [%#x]\n", status);
 639                         return -ENODEV;
 640                 }
 641                 device_declaration = 1;
 642                 pr->acpi_id = value;
 643         }
 644         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 645
 646         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 647         if (!cpu0_initialized && (cpu_index == -1) &&
 648             (num_online_cpus() == 1)) {
 649                 cpu_index = 0;
 650         }
 651
 652         cpu0_initialized = 1;
 653
 654         pr->id = cpu_index;
 655
 656         /*
 657          *  Extra Processor objects may be enumerated on MP systems with
 658          *  less than the max # of CPUs. They should be ignored _iff
 659          *  they are physically not present.
 660          */
 661         if (pr->id == -1) {
 662                 if (ACPI_FAILURE
 663                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 664                         return -ENODEV;
 665                 }
 666         }
 667         /*
 668          * On some boxes several processors use the same processor bus id.
 669          * But they are located in different scope. For example:
 670          * \_SB.SCK0.CPU0
 671          * \_SB.SCK1.CPU0
 672          * Rename the processor device bus id. And the new bus id will be
 673          * generated as the following format:
 674          * CPU+CPU ID.
 675          */
 676         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 677         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 678                           pr->acpi_id));
 679
 680         if (!object.processor.pblk_address)
 681                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 682         else if (object.processor.pblk_length != 6)
 683                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 684                             object.processor.pblk_length);
 685         else {
 686                 pr->throttling.address = object.processor.pblk_address;
 687                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 688                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 689
 690                 pr->pblk = object.processor.pblk_address;
 691
 692                 /*
 693                  * We don't care about error returns - we just try to mark
 694                  * these reserved so that nobody else is confused into thinking
 695                  * that this region might be unused..
 696                  *
 697                  * (In particular, allocating the IO range for Cardbus)
 698                  */
 699                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 700         }
 701
 702         /*
 703          * If ACPI describes a slot number for this CPU, we can use it
 704          * ensure we get the right value in the "physical id" field
 705          * of /proc/cpuinfo
 706          */
 707         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 708         if (ACPI_SUCCESS(status))
 709                 arch_fix_phys_package_id(pr->id, object.integer.value);
 710
 711         return 0;
 712 }
 713
 714 static DEFINE_PER_CPU(void *, processor_device_array);
 715
 716 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 717 {
 718         struct acpi_processor *pr = acpi_driver_data(device);
 719         int saved;
 720
 721         if (!pr)
 722                 return;
 723
 724         switch (event) {
 725         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 726                 saved = pr->performance_platform_limit;
 727                 acpi_processor_ppc_has_changed(pr, 1);
 728                 if (saved == pr->performance_platform_limit)
 729                         break;
 730                 acpi_bus_generate_proc_event(device, event,
 731                                         pr->performance_platform_limit);
 732                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 733                                                   dev_name(&device->dev), event,
 734                                                   pr->performance_platform_limit);
 735                 break;
 736         case ACPI_PROCESSOR_NOTIFY_POWER:
 737                 acpi_processor_cst_has_changed(pr);
 738                 acpi_bus_generate_proc_event(device, event, 0);
 739                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 740                                                   dev_name(&device->dev), event, 0);
 741                 break;
 742         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 743                 acpi_processor_tstate_has_changed(pr);
 744                 acpi_bus_generate_proc_event(device, event, 0);
 745                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 746                                                   dev_name(&device->dev), event, 0);
 747         default:
 748                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 749                                   "Unsupported event [0x%x]\n", event));
 750                 break;
 751         }
 752
 753         return;
 754 }
 755
 756 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 757                 unsigned long action, void *hcpu)
 758 {
 759         unsigned int cpu = (unsigned long)hcpu;
 760         struct acpi_processor *pr = per_cpu(processors, cpu);
 761
 762         if (action == CPU_ONLINE && pr) {
 763                 acpi_processor_ppc_has_changed(pr, 0);
 764                 acpi_processor_cst_has_changed(pr);
 765                 acpi_processor_tstate_has_changed(pr);
 766         }
 767         return NOTIFY_OK;
 768 }
 769
 770 static struct notifier_block acpi_cpu_notifier =
 771 {
 772             .notifier_call = acpi_cpu_soft_notify,
 773 };
 774
 775 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 776 {
 777         struct acpi_processor *pr = NULL;
 778         int result = 0;
 779         struct sys_device *sysdev;
 780
 781         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 782         if (!pr)
 783                 return -ENOMEM;
 784
 785         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 786                 kfree(pr);
 787                 return -ENOMEM;
 788         }
 789
 790         pr->handle = device->handle;
 791         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 792         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 793         device->driver_data = pr;
 794
 795         result = acpi_processor_get_info(device);
 796         if (result) {
 797                 /* Processor is physically not present */
 798                 return 0;
 799         }
 800
 801         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 802
 803         /*
 804          * Buggy BIOS check
 805          * ACPI id of processors can be reported wrongly by the BIOS.
 806          * Don't trust it blindly
 807          */
 808         if (per_cpu(processor_device_array, pr->id) != NULL &&
 809             per_cpu(processor_device_array, pr->id) != device) {
 810                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 811                         "for the processor\n");
 812                 result = -ENODEV;
 813                 goto err_free_cpumask;
 814         }
 815         per_cpu(processor_device_array, pr->id) = device;
 816
 817         per_cpu(processors, pr->id) = pr;
 818
 819         result = acpi_processor_add_fs(device);
 820         if (result)
 821                 goto err_free_cpumask;
 822
 823         sysdev = get_cpu_sysdev(pr->id);
 824         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 825                 result = -EFAULT;
 826                 goto err_remove_fs;
 827         }
 828
 829         /* _PDC call should be done before doing anything else (if reqd.). */
 830         arch_acpi_processor_init_pdc(pr);
 831         acpi_processor_set_pdc(pr);
 832         arch_acpi_processor_cleanup_pdc(pr);
 833
 834 #ifdef CONFIG_CPU_FREQ
 835         acpi_processor_ppc_has_changed(pr, 0);
 836 #endif
 837         acpi_processor_get_throttling_info(pr);
 838         acpi_processor_get_limit_info(pr);
 839
 840
 841         acpi_processor_power_init(pr, device);
 842
 843         pr->cdev = thermal_cooling_device_register("Processor", device,
 844                                                 &processor_cooling_ops);
 845         if (IS_ERR(pr->cdev)) {
 846                 result = PTR_ERR(pr->cdev);
 847                 goto err_power_exit;
 848         }
 849
 850         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 851                  pr->cdev->id);
 852
 853         result = sysfs_create_link(&device->dev.kobj,
 854                                    &pr->cdev->device.kobj,
 855                                    "thermal_cooling");
 856         if (result) {
 857                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 858                 goto err_thermal_unregister;
 859         }
 860         result = sysfs_create_link(&pr->cdev->device.kobj,
 861                                    &device->dev.kobj,
 862                                    "device");
 863         if (result) {
 864                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 865                 goto err_remove_sysfs;
 866         }
 867
 868         return 0;
 869
 870 err_remove_sysfs:
 871         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 872 err_thermal_unregister:
 873         thermal_cooling_device_unregister(pr->cdev);
 874 err_power_exit:
 875         acpi_processor_power_exit(pr, device);
 876 err_remove_fs:
 877         acpi_processor_remove_fs(device);
 878 err_free_cpumask:
 879         free_cpumask_var(pr->throttling.shared_cpu_map);
 880
 881         return result;
 882 }
 883
 884 static int acpi_processor_remove(struct acpi_device *device, int type)
 885 {
 886         struct acpi_processor *pr = NULL;
 887
 888
 889         if (!device || !acpi_driver_data(device))
 890                 return -EINVAL;
 891
 892         pr = acpi_driver_data(device);
 893
 894         if (pr->id >= nr_cpu_ids)
 895                 goto free;
 896
 897         if (type == ACPI_BUS_REMOVAL_EJECT) {
 898                 if (acpi_processor_handle_eject(pr))
 899                         return -EINVAL;
 900         }
 901
 902         acpi_processor_power_exit(pr, device);
 903
 904         sysfs_remove_link(&device->dev.kobj, "sysdev");
 905
 906         acpi_processor_remove_fs(device);
 907
 908         if (pr->cdev) {
 909                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 910                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 911                 thermal_cooling_device_unregister(pr->cdev);
 912                 pr->cdev = NULL;
 913         }
 914
 915         per_cpu(processors, pr->id) = NULL;
 916         per_cpu(processor_device_array, pr->id) = NULL;
 917
 918 free:
 919         free_cpumask_var(pr->throttling.shared_cpu_map);
 920         kfree(pr);
 921
 922         return 0;
 923 }
 924
 925 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 926 /****************************************************************************
 927  *      Acpi processor hotplug support                                      *
 928  ****************************************************************************/
 929
 930 static int is_processor_present(acpi_handle handle)
 931 {
 932         acpi_status status;
 933         unsigned long long sta = 0;
 934
 935
 936         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 937
 938         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 939                 return 1;
 940
 941         /*
 942          * _STA is mandatory for a processor that supports hot plug
 943          */
 944         if (status == AE_NOT_FOUND)
 945                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 946                                 "Processor does not support hot plug\n"));
 947         else
 948                 ACPI_EXCEPTION((AE_INFO, status,
 949                                 "Processor Device is not present"));
 950         return 0;
 951 }
 952
 953 static
 954 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 955 {
 956         acpi_handle phandle;
 957         struct acpi_device *pdev;
 958
 959
 960         if (acpi_get_parent(handle, &phandle)) {
 961                 return -ENODEV;
 962         }
 963
 964         if (acpi_bus_get_device(phandle, &pdev)) {
 965                 return -ENODEV;
 966         }
 967
 968         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 969                 return -ENODEV;
 970         }
 971
 972         return 0;
 973 }
 974
 975 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 976                                                 u32 event, void *data)
 977 {
 978         struct acpi_processor *pr;
 979         struct acpi_device *device = NULL;
 980         int result;
 981
 982
 983         switch (event) {
 984         case ACPI_NOTIFY_BUS_CHECK:
 985         case ACPI_NOTIFY_DEVICE_CHECK:
 986                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 987                 "Processor driver received %s event\n",
 988                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 989                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 990
 991                 if (!is_processor_present(handle))
 992                         break;
 993
 994                 if (acpi_bus_get_device(handle, &device)) {
 995                         result = acpi_processor_device_add(handle, &device);
 996                         if (result)
 997                                 printk(KERN_ERR PREFIX
 998                                             "Unable to add the device\n");
 999                         break;
1000                 }
1001                 break;
1002         case ACPI_NOTIFY_EJECT_REQUEST:
1003                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1004                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1005
1006                 if (acpi_bus_get_device(handle, &device)) {
1007                         printk(KERN_ERR PREFIX
1008                                     "Device don't exist, dropping EJECT\n");
1009                         break;
1010                 }
1011                 pr = acpi_driver_data(device);
1012                 if (!pr) {
1013                         printk(KERN_ERR PREFIX
1014                                     "Driver data is NULL, dropping EJECT\n");
1015                         return;
1016                 }
1017                 break;
1018         default:
1019                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1020                                   "Unsupported event [0x%x]\n", event));
1021                 break;
1022         }
1023
1024         return;
1025 }
1026
1027 static acpi_status
1028 processor_walk_namespace_cb(acpi_handle handle,
1029                             u32 lvl, void *context, void **rv)
1030 {
1031         acpi_status status;
1032         int *action = context;
1033         acpi_object_type type = 0;
1034
1035         status = acpi_get_type(handle, &type);
1036         if (ACPI_FAILURE(status))
1037                 return (AE_OK);
1038
1039         if (type != ACPI_TYPE_PROCESSOR)
1040                 return (AE_OK);
1041
1042         switch (*action) {
1043         case INSTALL_NOTIFY_HANDLER:
1044                 acpi_install_notify_handler(handle,
1045                                             ACPI_SYSTEM_NOTIFY,
1046                                             acpi_processor_hotplug_notify,
1047                                             NULL);
1048                 break;
1049         case UNINSTALL_NOTIFY_HANDLER:
1050                 acpi_remove_notify_handler(handle,
1051                                            ACPI_SYSTEM_NOTIFY,
1052                                            acpi_processor_hotplug_notify);
1053                 break;
1054         default:
1055                 break;
1056         }
1057
1058         return (AE_OK);
1059 }
1060
1061 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1062 {
1063
1064         if (!is_processor_present(handle)) {
1065                 return AE_ERROR;
1066         }
1067
1068         if (acpi_map_lsapic(handle, p_cpu))
1069                 return AE_ERROR;
1070
1071         if (arch_register_cpu(*p_cpu)) {
1072                 acpi_unmap_lsapic(*p_cpu);
1073                 return AE_ERROR;
1074         }
1075
1076         return AE_OK;
1077 }
1078
1079 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1080 {
1081         if (cpu_online(pr->id))
1082                 cpu_down(pr->id);
1083
1084         arch_unregister_cpu(pr->id);
1085         acpi_unmap_lsapic(pr->id);
1086         return (0);
1087 }
1088 #else
1089 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1090 {
1091         return AE_ERROR;
1092 }
1093 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1094 {
1095         return (-EINVAL);
1096 }
1097 #endif
1098
1099 static
1100 void acpi_processor_install_hotplug_notify(void)
1101 {
1102 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1103         int action = INSTALL_NOTIFY_HANDLER;
1104         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1105                             ACPI_ROOT_OBJECT,
1106                             ACPI_UINT32_MAX,
1107                             processor_walk_namespace_cb, NULL, &action, NULL);
1108 #endif
1109         register_hotcpu_notifier(&acpi_cpu_notifier);
1110 }
1111
1112 static
1113 void acpi_processor_uninstall_hotplug_notify(void)
1114 {
1115 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1116         int action = UNINSTALL_NOTIFY_HANDLER;
1117         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1118                             ACPI_ROOT_OBJECT,
1119                             ACPI_UINT32_MAX,
1120                             processor_walk_namespace_cb, NULL, &action, NULL);
1121 #endif
1122         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1123 }
1124
1125 /*
1126  * We keep the driver loaded even when ACPI is not running.
1127  * This is needed for the powernow-k8 driver, that works even without
1128  * ACPI, but needs symbols from this driver
1129  */
1130
1131 static int __init acpi_processor_init(void)
1132 {
1133         int result = 0;
1134
1135         if (acpi_disabled)
1136                 return 0;
1137
1138         memset(&errata, 0, sizeof(errata));
1139
1140 #ifdef CONFIG_SMP
1141         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1142                                 (struct acpi_table_header **)&madt)))
1143                 madt = NULL;
1144 #endif
1145 #ifdef CONFIG_ACPI_PROCFS
1146         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1147         if (!acpi_processor_dir)
1148                 return -ENOMEM;
1149 #endif
1150         /*
1151          * Check whether the system is DMI table. If yes, OSPM
1152          * should not use mwait for CPU-states.
1153          */
1154         dmi_check_system(processor_idle_dmi_table);
1155         result = cpuidle_register_driver(&acpi_idle_driver);
1156         if (result < 0)
1157                 goto out_proc;
1158
1159         result = acpi_bus_register_driver(&acpi_processor_driver);
1160         if (result < 0)
1161                 goto out_cpuidle;
1162
1163         acpi_processor_install_hotplug_notify();
1164
1165         acpi_thermal_cpufreq_init();
1166
1167         acpi_processor_ppc_init();
1168
1169         acpi_processor_throttling_init();
1170
1171         return 0;
1172
1173 out_cpuidle:
1174         cpuidle_unregister_driver(&acpi_idle_driver);
1175
1176 out_proc:
1177 #ifdef CONFIG_ACPI_PROCFS
1178         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1179 #endif
1180
1181         return result;
1182 }
1183
1184 static void __exit acpi_processor_exit(void)
1185 {
1186         if (acpi_disabled)
1187                 return;
1188
1189         acpi_processor_ppc_exit();
1190
1191         acpi_thermal_cpufreq_exit();
1192
1193         acpi_processor_uninstall_hotplug_notify();
1194
1195         acpi_bus_unregister_driver(&acpi_processor_driver);
1196
1197         cpuidle_unregister_driver(&acpi_idle_driver);
1198
1199 #ifdef CONFIG_ACPI_PROCFS
1200         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1201 #endif
1202
1203         return;
1204 }
1205
1206 module_init(acpi_processor_init);
1207 module_exit(acpi_processor_exit);
1208
1209 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1210
1211 MODULE_ALIAS("processor");