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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_COMPONENT        0x01000000
  63 #define ACPI_PROCESSOR_CLASS            "processor"
  64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  65 #define ACPI_PROCESSOR_FILE_INFO        "info"
  66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  71
  72 #define ACPI_PROCESSOR_LIMIT_USER       0
  73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  74
  75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  76 ACPI_MODULE_NAME("processor_core");
  77
  78 MODULE_AUTHOR("Paul Diefenbaugh");
  79 MODULE_DESCRIPTION("ACPI Processor Driver");
  80 MODULE_LICENSE("GPL");
  81
  82 static int acpi_processor_add(struct acpi_device *device);
  83 static int acpi_processor_start(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  89
  90
  91 static const struct acpi_device_id processor_device_ids[] = {
  92         {ACPI_PROCESSOR_HID, 0},
  93         {"", 0},
  94 };
  95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  96
  97 static struct acpi_driver acpi_processor_driver = {
  98         .name = "processor",
  99         .class = ACPI_PROCESSOR_CLASS,
 100         .ids = processor_device_ids,
 101         .ops = {
 102                 .add = acpi_processor_add,
 103                 .remove = acpi_processor_remove,
 104                 .start = acpi_processor_start,
 105                 .suspend = acpi_processor_suspend,
 106                 .resume = acpi_processor_resume,
 107                 },
 108 };
 109
 110 #define INSTALL_NOTIFY_HANDLER          1
 111 #define UNINSTALL_NOTIFY_HANDLER        2
 112
 113 static const struct file_operations acpi_processor_info_fops = {
 114         .owner = THIS_MODULE,
 115         .open = acpi_processor_info_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 DEFINE_PER_CPU(struct acpi_processor *, processors);
 122 struct acpi_processor_errata errata __read_mostly;
 123
 124 /* --------------------------------------------------------------------------
 125                                 Errata Handling
 126    -------------------------------------------------------------------------- */
 127
 128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 129 {
 130         u8 value1 = 0;
 131         u8 value2 = 0;
 132
 133
 134         if (!dev)
 135                 return -EINVAL;
 136
 137         /*
 138          * Note that 'dev' references the PIIX4 ACPI Controller.
 139          */
 140
 141         switch (dev->revision) {
 142         case 0:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 144                 break;
 145         case 1:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 147                 break;
 148         case 2:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 150                 break;
 151         case 3:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 153                 break;
 154         default:
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 156                 break;
 157         }
 158
 159         switch (dev->revision) {
 160
 161         case 0:         /* PIIX4 A-step */
 162         case 1:         /* PIIX4 B-step */
 163                 /*
 164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 167                  * 2002 PIIX4 specification update.  Applies to only older
 168                  * PIIX4 models.
 169                  */
 170                 errata.piix4.throttle = 1;
 171
 172         case 2:         /* PIIX4E */
 173         case 3:         /* PIIX4M */
 174                 /*
 175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 176                  * Livelock") from the January 2002 PIIX4 specification update.
 177                  * Applies to all PIIX4 models.
 178                  */
 179
 180                 /*
 181                  * BM-IDE
 182                  * ------
 183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 184                  * Status register address.  We'll use this later to read
 185                  * each IDE controller's DMA status to make sure we catch all
 186                  * DMA activity.
 187                  */
 188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 189                                      PCI_DEVICE_ID_INTEL_82371AB,
 190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 191                 if (dev) {
 192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 193                         pci_dev_put(dev);
 194                 }
 195
 196                 /*
 197                  * Type-F DMA
 198                  * ----------
 199                  * Find the PIIX4 ISA Controller and read the Motherboard
 200                  * DMA controller's status to see if Type-F (Fast) DMA mode
 201                  * is enabled (bit 7) on either channel.  Note that we'll
 202                  * disable C3 support if this is enabled, as some legacy
 203                  * devices won't operate well if fast DMA is disabled.
 204                  */
 205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 208                 if (dev) {
 209                         pci_read_config_byte(dev, 0x76, &value1);
 210                         pci_read_config_byte(dev, 0x77, &value2);
 211                         if ((value1 & 0x80) || (value2 & 0x80))
 212                                 errata.piix4.fdma = 1;
 213                         pci_dev_put(dev);
 214                 }
 215
 216                 break;
 217         }
 218
 219         if (errata.piix4.bmisx)
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 222         if (errata.piix4.fdma)
 223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 225
 226         return 0;
 227 }
 228
 229 static int acpi_processor_errata(struct acpi_processor *pr)
 230 {
 231         int result = 0;
 232         struct pci_dev *dev = NULL;
 233
 234
 235         if (!pr)
 236                 return -EINVAL;
 237
 238         /*
 239          * PIIX4
 240          */
 241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 243                              PCI_ANY_ID, NULL);
 244         if (dev) {
 245                 result = acpi_processor_errata_piix4(dev);
 246                 pci_dev_put(dev);
 247         }
 248
 249         return result;
 250 }
 251
 252 /* --------------------------------------------------------------------------
 253                               Common ACPI processor functions
 254    -------------------------------------------------------------------------- */
 255
 256 /*
 257  * _PDC is required for a BIOS-OS handshake for most of the newer
 258  * ACPI processor features.
 259  */
 260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 261 {
 262         struct acpi_object_list *pdc_in = pr->pdc;
 263         acpi_status status = AE_OK;
 264
 265
 266         if (!pdc_in)
 267                 return status;
 268         if (idle_nomwait) {
 269                 /*
 270                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 271                  * mode will be disabled in the parameter of _PDC object.
 272                  * Of course C1_FFH access mode will also be disabled.
 273                  */
 274                 union acpi_object *obj;
 275                 u32 *buffer = NULL;
 276
 277                 obj = pdc_in->pointer;
 278                 buffer = (u32 *)(obj->buffer.pointer);
 279                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 280
 281         }
 282         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 283
 284         if (ACPI_FAILURE(status))
 285                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 286                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 287
 288         return status;
 289 }
 290
 291 /* --------------------------------------------------------------------------
 292                               FS Interface (/proc)
 293    -------------------------------------------------------------------------- */
 294
 295 static struct proc_dir_entry *acpi_processor_dir = NULL;
 296
 297 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 298 {
 299         struct acpi_processor *pr = seq->private;
 300
 301
 302         if (!pr)
 303                 goto end;
 304
 305         seq_printf(seq, "processor id:            %d\n"
 306                    "acpi id:                 %d\n"
 307                    "bus mastering control:   %s\n"
 308                    "power management:        %s\n"
 309                    "throttling control:      %s\n"
 310                    "limit interface:         %s\n",
 311                    pr->id,
 312                    pr->acpi_id,
 313                    pr->flags.bm_control ? "yes" : "no",
 314                    pr->flags.power ? "yes" : "no",
 315                    pr->flags.throttling ? "yes" : "no",
 316                    pr->flags.limit ? "yes" : "no");
 317
 318       end:
 319         return 0;
 320 }
 321
 322 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 323 {
 324         return single_open(file, acpi_processor_info_seq_show,
 325                            PDE(inode)->data);
 326 }
 327
 328 static int acpi_processor_add_fs(struct acpi_device *device)
 329 {
 330         struct proc_dir_entry *entry = NULL;
 331
 332
 333         if (!acpi_device_dir(device)) {
 334                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 335                                                      acpi_processor_dir);
 336                 if (!acpi_device_dir(device))
 337                         return -ENODEV;
 338         }
 339         acpi_device_dir(device)->owner = THIS_MODULE;
 340
 341         /* 'info' [R] */
 342         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 343                                  S_IRUGO, acpi_device_dir(device),
 344                                  &acpi_processor_info_fops,
 345                                  acpi_driver_data(device));
 346         if (!entry)
 347                 return -EIO;
 348
 349         /* 'throttling' [R/W] */
 350         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 351                                  S_IFREG | S_IRUGO | S_IWUSR,
 352                                  acpi_device_dir(device),
 353                                  &acpi_processor_throttling_fops,
 354                                  acpi_driver_data(device));
 355         if (!entry)
 356                 return -EIO;
 357
 358         /* 'limit' [R/W] */
 359         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 360                                  S_IFREG | S_IRUGO | S_IWUSR,
 361                                  acpi_device_dir(device),
 362                                  &acpi_processor_limit_fops,
 363                                  acpi_driver_data(device));
 364         if (!entry)
 365                 return -EIO;
 366         return 0;
 367 }
 368
 369 static int acpi_processor_remove_fs(struct acpi_device *device)
 370 {
 371
 372         if (acpi_device_dir(device)) {
 373                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 374                                   acpi_device_dir(device));
 375                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 376                                   acpi_device_dir(device));
 377                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 378                                   acpi_device_dir(device));
 379                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 380                 acpi_device_dir(device) = NULL;
 381         }
 382
 383         return 0;
 384 }
 385
 386 /* Use the acpiid in MADT to map cpus in case of SMP */
 387
 388 #ifndef CONFIG_SMP
 389 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 390 #else
 391
 392 static struct acpi_table_madt *madt;
 393
 394 static int map_lapic_id(struct acpi_subtable_header *entry,
 395                  u32 acpi_id, int *apic_id)
 396 {
 397         struct acpi_madt_local_apic *lapic =
 398                 (struct acpi_madt_local_apic *)entry;
 399         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 400             lapic->processor_id == acpi_id) {
 401                 *apic_id = lapic->id;
 402                 return 1;
 403         }
 404         return 0;
 405 }
 406
 407 static int map_lsapic_id(struct acpi_subtable_header *entry,
 408                   u32 acpi_id, int *apic_id)
 409 {
 410         struct acpi_madt_local_sapic *lsapic =
 411                 (struct acpi_madt_local_sapic *)entry;
 412         /* Only check enabled APICs*/
 413         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 414                 /* First check against id */
 415                 if (lsapic->processor_id == acpi_id) {
 416                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 417                         return 1;
 418                 /* Check against optional uid */
 419                 } else if (entry->length >= 16 &&
 420                         lsapic->uid == acpi_id) {
 421                         *apic_id = lsapic->uid;
 422                         return 1;
 423                 }
 424         }
 425         return 0;
 426 }
 427
 428 static int map_madt_entry(u32 acpi_id)
 429 {
 430         unsigned long madt_end, entry;
 431         int apic_id = -1;
 432
 433         if (!madt)
 434                 return apic_id;
 435
 436         entry = (unsigned long)madt;
 437         madt_end = entry + madt->header.length;
 438
 439         /* Parse all entries looking for a match. */
 440
 441         entry += sizeof(struct acpi_table_madt);
 442         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 443                 struct acpi_subtable_header *header =
 444                         (struct acpi_subtable_header *)entry;
 445                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 446                         if (map_lapic_id(header, acpi_id, &apic_id))
 447                                 break;
 448                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 449                         if (map_lsapic_id(header, acpi_id, &apic_id))
 450                                 break;
 451                 }
 452                 entry += header->length;
 453         }
 454         return apic_id;
 455 }
 456
 457 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 458 {
 459         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 460         union acpi_object *obj;
 461         struct acpi_subtable_header *header;
 462         int apic_id = -1;
 463
 464         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 465                 goto exit;
 466
 467         if (!buffer.length || !buffer.pointer)
 468                 goto exit;
 469
 470         obj = buffer.pointer;
 471         if (obj->type != ACPI_TYPE_BUFFER ||
 472             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 473                 goto exit;
 474         }
 475
 476         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 477         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 478                 map_lapic_id(header, acpi_id, &apic_id);
 479         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 480                 map_lsapic_id(header, acpi_id, &apic_id);
 481         }
 482
 483 exit:
 484         if (buffer.pointer)
 485                 kfree(buffer.pointer);
 486         return apic_id;
 487 }
 488
 489 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 490 {
 491         int i;
 492         int apic_id = -1;
 493
 494         apic_id = map_mat_entry(handle, acpi_id);
 495         if (apic_id == -1)
 496                 apic_id = map_madt_entry(acpi_id);
 497         if (apic_id == -1)
 498                 return apic_id;
 499
 500         for_each_possible_cpu(i) {
 501                 if (cpu_physical_id(i) == apic_id)
 502                         return i;
 503         }
 504         return -1;
 505 }
 506 #endif
 507
 508 /* --------------------------------------------------------------------------
 509                                  Driver Interface
 510    -------------------------------------------------------------------------- */
 511
 512 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 513 {
 514         acpi_status status = 0;
 515         union acpi_object object = { 0 };
 516         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 517         int cpu_index;
 518         static int cpu0_initialized;
 519
 520
 521         if (!pr)
 522                 return -EINVAL;
 523
 524         if (num_online_cpus() > 1)
 525                 errata.smp = TRUE;
 526
 527         acpi_processor_errata(pr);
 528
 529         /*
 530          * Check to see if we have bus mastering arbitration control.  This
 531          * is required for proper C3 usage (to maintain cache coherency).
 532          */
 533         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 534                 pr->flags.bm_control = 1;
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "Bus mastering arbitration control present\n"));
 537         } else
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                                   "No bus mastering arbitration control\n"));
 540
 541         /* Check if it is a Device with HID and UID */
 542         if (has_uid) {
 543                 unsigned long value;
 544                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 545                                                 NULL, &value);
 546                 if (ACPI_FAILURE(status)) {
 547                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 548                         return -ENODEV;
 549                 }
 550                 pr->acpi_id = value;
 551         } else {
 552                 /*
 553                 * Evalute the processor object.  Note that it is common on SMP to
 554                 * have the first (boot) processor with a valid PBLK address while
 555                 * all others have a NULL address.
 556                 */
 557                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 558                 if (ACPI_FAILURE(status)) {
 559                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 560                         return -ENODEV;
 561                 }
 562
 563                 /*
 564                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 565                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 566                 */
 567                 pr->acpi_id = object.processor.proc_id;
 568         }
 569         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 570
 571         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 572         if (!cpu0_initialized && (cpu_index == -1) &&
 573             (num_online_cpus() == 1)) {
 574                 cpu_index = 0;
 575         }
 576
 577         cpu0_initialized = 1;
 578
 579         pr->id = cpu_index;
 580
 581         /*
 582          *  Extra Processor objects may be enumerated on MP systems with
 583          *  less than the max # of CPUs. They should be ignored _iff
 584          *  they are physically not present.
 585          */
 586         if (pr->id == -1) {
 587                 if (ACPI_FAILURE
 588                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 589                         return -ENODEV;
 590                 }
 591         }
 592
 593         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 594                           pr->acpi_id));
 595
 596         if (!object.processor.pblk_address)
 597                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 598         else if (object.processor.pblk_length != 6)
 599                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 600                             object.processor.pblk_length);
 601         else {
 602                 pr->throttling.address = object.processor.pblk_address;
 603                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 604                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 605
 606                 pr->pblk = object.processor.pblk_address;
 607
 608                 /*
 609                  * We don't care about error returns - we just try to mark
 610                  * these reserved so that nobody else is confused into thinking
 611                  * that this region might be unused..
 612                  *
 613                  * (In particular, allocating the IO range for Cardbus)
 614                  */
 615                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 616         }
 617
 618         /*
 619          * If ACPI describes a slot number for this CPU, we can use it
 620          * ensure we get the right value in the "physical id" field
 621          * of /proc/cpuinfo
 622          */
 623         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 624         if (ACPI_SUCCESS(status))
 625                 arch_fix_phys_package_id(pr->id, object.integer.value);
 626
 627         return 0;
 628 }
 629
 630 static DEFINE_PER_CPU(void *, processor_device_array);
 631
 632 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 633 {
 634         int result = 0;
 635         acpi_status status = AE_OK;
 636         struct acpi_processor *pr;
 637         struct sys_device *sysdev;
 638
 639         pr = acpi_driver_data(device);
 640
 641         result = acpi_processor_get_info(pr, device->flags.unique_id);
 642         if (result) {
 643                 /* Processor is physically not present */
 644                 return 0;
 645         }
 646
 647         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 648
 649         /*
 650          * Buggy BIOS check
 651          * ACPI id of processors can be reported wrongly by the BIOS.
 652          * Don't trust it blindly
 653          */
 654         if (per_cpu(processor_device_array, pr->id) != NULL &&
 655             per_cpu(processor_device_array, pr->id) != device) {
 656                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 657                         "for the processor\n");
 658                 return -ENODEV;
 659         }
 660         per_cpu(processor_device_array, pr->id) = device;
 661
 662         per_cpu(processors, pr->id) = pr;
 663
 664         result = acpi_processor_add_fs(device);
 665         if (result)
 666                 goto end;
 667
 668         sysdev = get_cpu_sysdev(pr->id);
 669         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 670                 return -EFAULT;
 671
 672         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 673                                              acpi_processor_notify, pr);
 674
 675         /* _PDC call should be done before doing anything else (if reqd.). */
 676         arch_acpi_processor_init_pdc(pr);
 677         acpi_processor_set_pdc(pr);
 678 #ifdef CONFIG_CPU_FREQ
 679         acpi_processor_ppc_has_changed(pr);
 680 #endif
 681         acpi_processor_get_throttling_info(pr);
 682         acpi_processor_get_limit_info(pr);
 683
 684
 685         acpi_processor_power_init(pr, device);
 686
 687         pr->cdev = thermal_cooling_device_register("Processor", device,
 688                                                 &processor_cooling_ops);
 689         if (IS_ERR(pr->cdev)) {
 690                 result = PTR_ERR(pr->cdev);
 691                 goto end;
 692         }
 693
 694         printk(KERN_INFO PREFIX
 695                 "%s is registered as cooling_device%d\n",
 696                 device->dev.bus_id, pr->cdev->id);
 697
 698         result = sysfs_create_link(&device->dev.kobj,
 699                                    &pr->cdev->device.kobj,
 700                                    "thermal_cooling");
 701         if (result)
 702                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 703         result = sysfs_create_link(&pr->cdev->device.kobj,
 704                                    &device->dev.kobj,
 705                                    "device");
 706         if (result)
 707                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 708
 709         if (pr->flags.throttling) {
 710                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 711                        acpi_device_name(device), acpi_device_bid(device));
 712                 printk(" %d throttling states", pr->throttling.state_count);
 713                 printk(")\n");
 714         }
 715
 716       end:
 717
 718         return result;
 719 }
 720
 721 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 722 {
 723         struct acpi_processor *pr = data;
 724         struct acpi_device *device = NULL;
 725         int saved;
 726
 727         if (!pr)
 728                 return;
 729
 730         if (acpi_bus_get_device(pr->handle, &device))
 731                 return;
 732
 733         switch (event) {
 734         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 735                 saved = pr->performance_platform_limit;
 736                 acpi_processor_ppc_has_changed(pr);
 737                 if (saved == pr->performance_platform_limit)
 738                         break;
 739                 acpi_bus_generate_proc_event(device, event,
 740                                         pr->performance_platform_limit);
 741                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 742                                                   device->dev.bus_id, event,
 743                                                   pr->performance_platform_limit);
 744                 break;
 745         case ACPI_PROCESSOR_NOTIFY_POWER:
 746                 acpi_processor_cst_has_changed(pr);
 747                 acpi_bus_generate_proc_event(device, event, 0);
 748                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 749                                                   device->dev.bus_id, event, 0);
 750                 break;
 751         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 752                 acpi_processor_tstate_has_changed(pr);
 753                 acpi_bus_generate_proc_event(device, event, 0);
 754                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 755                                                   device->dev.bus_id, event, 0);
 756         default:
 757                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 758                                   "Unsupported event [0x%x]\n", event));
 759                 break;
 760         }
 761
 762         return;
 763 }
 764
 765 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 766                 unsigned long action, void *hcpu)
 767 {
 768         unsigned int cpu = (unsigned long)hcpu;
 769         struct acpi_processor *pr = per_cpu(processors, cpu);
 770
 771         if (action == CPU_ONLINE && pr) {
 772                 acpi_processor_ppc_has_changed(pr);
 773                 acpi_processor_cst_has_changed(pr);
 774                 acpi_processor_tstate_has_changed(pr);
 775         }
 776         return NOTIFY_OK;
 777 }
 778
 779 static struct notifier_block acpi_cpu_notifier =
 780 {
 781             .notifier_call = acpi_cpu_soft_notify,
 782 };
 783
 784 static int acpi_processor_add(struct acpi_device *device)
 785 {
 786         struct acpi_processor *pr = NULL;
 787
 788
 789         if (!device)
 790                 return -EINVAL;
 791
 792         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 793         if (!pr)
 794                 return -ENOMEM;
 795
 796         pr->handle = device->handle;
 797         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 798         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 799         acpi_driver_data(device) = pr;
 800
 801         return 0;
 802 }
 803
 804 static int acpi_processor_remove(struct acpi_device *device, int type)
 805 {
 806         acpi_status status = AE_OK;
 807         struct acpi_processor *pr = NULL;
 808
 809
 810         if (!device || !acpi_driver_data(device))
 811                 return -EINVAL;
 812
 813         pr = acpi_driver_data(device);
 814
 815         if (pr->id >= nr_cpu_ids) {
 816                 kfree(pr);
 817                 return 0;
 818         }
 819
 820         if (type == ACPI_BUS_REMOVAL_EJECT) {
 821                 if (acpi_processor_handle_eject(pr))
 822                         return -EINVAL;
 823         }
 824
 825         acpi_processor_power_exit(pr, device);
 826
 827         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 828                                             acpi_processor_notify);
 829
 830         sysfs_remove_link(&device->dev.kobj, "sysdev");
 831
 832         acpi_processor_remove_fs(device);
 833
 834         if (pr->cdev) {
 835                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 836                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 837                 thermal_cooling_device_unregister(pr->cdev);
 838                 pr->cdev = NULL;
 839         }
 840
 841         per_cpu(processors, pr->id) = NULL;
 842         per_cpu(processor_device_array, pr->id) = NULL;
 843         kfree(pr);
 844
 845         return 0;
 846 }
 847
 848 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 849 /****************************************************************************
 850  *      Acpi processor hotplug support                                      *
 851  ****************************************************************************/
 852
 853 static int is_processor_present(acpi_handle handle)
 854 {
 855         acpi_status status;
 856         unsigned long sta = 0;
 857
 858
 859         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 860
 861         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 862                 return 1;
 863
 864         /*
 865          * _STA is mandatory for a processor that supports hot plug
 866          */
 867         if (status == AE_NOT_FOUND)
 868                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 869                                 "Processor does not support hot plug\n"));
 870         else
 871                 ACPI_EXCEPTION((AE_INFO, status,
 872                                 "Processor Device is not present"));
 873         return 0;
 874 }
 875
 876 static
 877 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 878 {
 879         acpi_handle phandle;
 880         struct acpi_device *pdev;
 881         struct acpi_processor *pr;
 882
 883
 884         if (acpi_get_parent(handle, &phandle)) {
 885                 return -ENODEV;
 886         }
 887
 888         if (acpi_bus_get_device(phandle, &pdev)) {
 889                 return -ENODEV;
 890         }
 891
 892         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 893                 return -ENODEV;
 894         }
 895
 896         acpi_bus_start(*device);
 897
 898         pr = acpi_driver_data(*device);
 899         if (!pr)
 900                 return -ENODEV;
 901
 902         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 903                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 904         }
 905         return 0;
 906 }
 907
 908 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 909                                                 u32 event, void *data)
 910 {
 911         struct acpi_processor *pr;
 912         struct acpi_device *device = NULL;
 913         int result;
 914
 915
 916         switch (event) {
 917         case ACPI_NOTIFY_BUS_CHECK:
 918         case ACPI_NOTIFY_DEVICE_CHECK:
 919                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 920                 "Processor driver received %s event\n",
 921                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 922                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 923
 924                 if (!is_processor_present(handle))
 925                         break;
 926
 927                 if (acpi_bus_get_device(handle, &device)) {
 928                         result = acpi_processor_device_add(handle, &device);
 929                         if (result)
 930                                 printk(KERN_ERR PREFIX
 931                                             "Unable to add the device\n");
 932                         break;
 933                 }
 934
 935                 pr = acpi_driver_data(device);
 936                 if (!pr) {
 937                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 938                         break;
 939                 }
 940
 941                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 942                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 943                         break;
 944                 }
 945
 946                 result = acpi_processor_start(device);
 947                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 948                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 949                 } else {
 950                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 951                                     acpi_device_bid(device));
 952                 }
 953                 break;
 954         case ACPI_NOTIFY_EJECT_REQUEST:
 955                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 956                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 957
 958                 if (acpi_bus_get_device(handle, &device)) {
 959                         printk(KERN_ERR PREFIX
 960                                     "Device don't exist, dropping EJECT\n");
 961                         break;
 962                 }
 963                 pr = acpi_driver_data(device);
 964                 if (!pr) {
 965                         printk(KERN_ERR PREFIX
 966                                     "Driver data is NULL, dropping EJECT\n");
 967                         return;
 968                 }
 969
 970                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
 971                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 972                 break;
 973         default:
 974                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 975                                   "Unsupported event [0x%x]\n", event));
 976                 break;
 977         }
 978
 979         return;
 980 }
 981
 982 static acpi_status
 983 processor_walk_namespace_cb(acpi_handle handle,
 984                             u32 lvl, void *context, void **rv)
 985 {
 986         acpi_status status;
 987         int *action = context;
 988         acpi_object_type type = 0;
 989
 990         status = acpi_get_type(handle, &type);
 991         if (ACPI_FAILURE(status))
 992                 return (AE_OK);
 993
 994         if (type != ACPI_TYPE_PROCESSOR)
 995                 return (AE_OK);
 996
 997         switch (*action) {
 998         case INSTALL_NOTIFY_HANDLER:
 999                 acpi_install_notify_handler(handle,
1000                                             ACPI_SYSTEM_NOTIFY,
1001                                             acpi_processor_hotplug_notify,
1002                                             NULL);
1003                 break;
1004         case UNINSTALL_NOTIFY_HANDLER:
1005                 acpi_remove_notify_handler(handle,
1006                                            ACPI_SYSTEM_NOTIFY,
1007                                            acpi_processor_hotplug_notify);
1008                 break;
1009         default:
1010                 break;
1011         }
1012
1013         return (AE_OK);
1014 }
1015
1016 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1017 {
1018
1019         if (!is_processor_present(handle)) {
1020                 return AE_ERROR;
1021         }
1022
1023         if (acpi_map_lsapic(handle, p_cpu))
1024                 return AE_ERROR;
1025
1026         if (arch_register_cpu(*p_cpu)) {
1027                 acpi_unmap_lsapic(*p_cpu);
1028                 return AE_ERROR;
1029         }
1030
1031         return AE_OK;
1032 }
1033
1034 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1035 {
1036         if (cpu_online(pr->id))
1037                 cpu_down(pr->id);
1038
1039         arch_unregister_cpu(pr->id);
1040         acpi_unmap_lsapic(pr->id);
1041         return (0);
1042 }
1043 #else
1044 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1045 {
1046         return AE_ERROR;
1047 }
1048 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1049 {
1050         return (-EINVAL);
1051 }
1052 #endif
1053
1054 static
1055 void acpi_processor_install_hotplug_notify(void)
1056 {
1057 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1058         int action = INSTALL_NOTIFY_HANDLER;
1059         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1060                             ACPI_ROOT_OBJECT,
1061                             ACPI_UINT32_MAX,
1062                             processor_walk_namespace_cb, &action, NULL);
1063 #endif
1064         register_hotcpu_notifier(&acpi_cpu_notifier);
1065 }
1066
1067 static
1068 void acpi_processor_uninstall_hotplug_notify(void)
1069 {
1070 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1071         int action = UNINSTALL_NOTIFY_HANDLER;
1072         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1073                             ACPI_ROOT_OBJECT,
1074                             ACPI_UINT32_MAX,
1075                             processor_walk_namespace_cb, &action, NULL);
1076 #endif
1077         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1078 }
1079
1080 /*
1081  * We keep the driver loaded even when ACPI is not running.
1082  * This is needed for the powernow-k8 driver, that works even without
1083  * ACPI, but needs symbols from this driver
1084  */
1085
1086 static int __init acpi_processor_init(void)
1087 {
1088         int result = 0;
1089
1090         memset(&errata, 0, sizeof(errata));
1091
1092 #ifdef CONFIG_SMP
1093         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1094                                 (struct acpi_table_header **)&madt)))
1095                 madt = NULL;
1096 #endif
1097
1098         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1099         if (!acpi_processor_dir)
1100                 return -ENOMEM;
1101         acpi_processor_dir->owner = THIS_MODULE;
1102
1103         result = cpuidle_register_driver(&acpi_idle_driver);
1104         if (result < 0)
1105                 goto out_proc;
1106
1107         result = acpi_bus_register_driver(&acpi_processor_driver);
1108         if (result < 0)
1109                 goto out_cpuidle;
1110
1111         acpi_processor_install_hotplug_notify();
1112
1113         acpi_thermal_cpufreq_init();
1114
1115         acpi_processor_ppc_init();
1116
1117         acpi_processor_throttling_init();
1118
1119         return 0;
1120
1121 out_cpuidle:
1122         cpuidle_unregister_driver(&acpi_idle_driver);
1123
1124 out_proc:
1125         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1126
1127         return result;
1128 }
1129
1130 static void __exit acpi_processor_exit(void)
1131 {
1132         acpi_processor_ppc_exit();
1133
1134         acpi_thermal_cpufreq_exit();
1135
1136         acpi_processor_uninstall_hotplug_notify();
1137
1138         acpi_bus_unregister_driver(&acpi_processor_driver);
1139
1140         cpuidle_unregister_driver(&acpi_idle_driver);
1141
1142         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1143
1144         return;
1145 }
1146
1147 module_init(acpi_processor_init);
1148 module_exit(acpi_processor_exit);
1149
1150 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1151
1152 MODULE_ALIAS("processor");