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