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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
  48 #include <asm/io.h>
  49 #include <asm/system.h>
  50 #include <asm/cpu.h>
  51 #include <asm/delay.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54 #include <asm/smp.h>
  55 #include <asm/acpi.h>
  56
  57 #include <acpi/acpi_bus.h>
  58 #include <acpi/acpi_drivers.h>
  59 #include <acpi/processor.h>
  60
  61 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  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 extern int acpi_processor_tstate_has_changed(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         .open = acpi_processor_info_open_fs,
 115         .read = seq_read,
 116         .llseek = seq_lseek,
 117         .release = single_release,
 118 };
 119
 120 struct acpi_processor *processors[NR_CPUS];
 121 struct acpi_processor_errata errata __read_mostly;
 122
 123 /* --------------------------------------------------------------------------
 124                                 Errata Handling
 125    -------------------------------------------------------------------------- */
 126
 127 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 128 {
 129         u8 value1 = 0;
 130         u8 value2 = 0;
 131
 132
 133         if (!dev)
 134                 return -EINVAL;
 135
 136         /*
 137          * Note that 'dev' references the PIIX4 ACPI Controller.
 138          */
 139
 140         switch (dev->revision) {
 141         case 0:
 142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 143                 break;
 144         case 1:
 145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 146                 break;
 147         case 2:
 148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 149                 break;
 150         case 3:
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 152                 break;
 153         default:
 154                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 155                 break;
 156         }
 157
 158         switch (dev->revision) {
 159
 160         case 0:         /* PIIX4 A-step */
 161         case 1:         /* PIIX4 B-step */
 162                 /*
 163                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 164                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 165                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 166                  * 2002 PIIX4 specification update.  Applies to only older
 167                  * PIIX4 models.
 168                  */
 169                 errata.piix4.throttle = 1;
 170
 171         case 2:         /* PIIX4E */
 172         case 3:         /* PIIX4M */
 173                 /*
 174                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 175                  * Livelock") from the January 2002 PIIX4 specification update.
 176                  * Applies to all PIIX4 models.
 177                  */
 178
 179                 /*
 180                  * BM-IDE
 181                  * ------
 182                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 183                  * Status register address.  We'll use this later to read
 184                  * each IDE controller's DMA status to make sure we catch all
 185                  * DMA activity.
 186                  */
 187                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 188                                      PCI_DEVICE_ID_INTEL_82371AB,
 189                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 190                 if (dev) {
 191                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 192                         pci_dev_put(dev);
 193                 }
 194
 195                 /*
 196                  * Type-F DMA
 197                  * ----------
 198                  * Find the PIIX4 ISA Controller and read the Motherboard
 199                  * DMA controller's status to see if Type-F (Fast) DMA mode
 200                  * is enabled (bit 7) on either channel.  Note that we'll
 201                  * disable C3 support if this is enabled, as some legacy
 202                  * devices won't operate well if fast DMA is disabled.
 203                  */
 204                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 205                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 206                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 207                 if (dev) {
 208                         pci_read_config_byte(dev, 0x76, &value1);
 209                         pci_read_config_byte(dev, 0x77, &value2);
 210                         if ((value1 & 0x80) || (value2 & 0x80))
 211                                 errata.piix4.fdma = 1;
 212                         pci_dev_put(dev);
 213                 }
 214
 215                 break;
 216         }
 217
 218         if (errata.piix4.bmisx)
 219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 220                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 221         if (errata.piix4.fdma)
 222                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 223                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 224
 225         return 0;
 226 }
 227
 228 static int acpi_processor_errata(struct acpi_processor *pr)
 229 {
 230         int result = 0;
 231         struct pci_dev *dev = NULL;
 232
 233
 234         if (!pr)
 235                 return -EINVAL;
 236
 237         /*
 238          * PIIX4
 239          */
 240         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 241                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 242                              PCI_ANY_ID, NULL);
 243         if (dev) {
 244                 result = acpi_processor_errata_piix4(dev);
 245                 pci_dev_put(dev);
 246         }
 247
 248         return result;
 249 }
 250
 251 /* --------------------------------------------------------------------------
 252                               Common ACPI processor functions
 253    -------------------------------------------------------------------------- */
 254
 255 /*
 256  * _PDC is required for a BIOS-OS handshake for most of the newer
 257  * ACPI processor features.
 258  */
 259 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 260 {
 261         struct acpi_object_list *pdc_in = pr->pdc;
 262         acpi_status status = AE_OK;
 263
 264
 265         if (!pdc_in)
 266                 return status;
 267
 268         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 269
 270         if (ACPI_FAILURE(status))
 271                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 272                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 273
 274         return status;
 275 }
 276
 277 /* --------------------------------------------------------------------------
 278                               FS Interface (/proc)
 279    -------------------------------------------------------------------------- */
 280
 281 static struct proc_dir_entry *acpi_processor_dir = NULL;
 282
 283 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 284 {
 285         struct acpi_processor *pr = seq->private;
 286
 287
 288         if (!pr)
 289                 goto end;
 290
 291         seq_printf(seq, "processor id:            %d\n"
 292                    "acpi id:                 %d\n"
 293                    "bus mastering control:   %s\n"
 294                    "power management:        %s\n"
 295                    "throttling control:      %s\n"
 296                    "limit interface:         %s\n",
 297                    pr->id,
 298                    pr->acpi_id,
 299                    pr->flags.bm_control ? "yes" : "no",
 300                    pr->flags.power ? "yes" : "no",
 301                    pr->flags.throttling ? "yes" : "no",
 302                    pr->flags.limit ? "yes" : "no");
 303
 304       end:
 305         return 0;
 306 }
 307
 308 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 309 {
 310         return single_open(file, acpi_processor_info_seq_show,
 311                            PDE(inode)->data);
 312 }
 313
 314 static int acpi_processor_add_fs(struct acpi_device *device)
 315 {
 316         struct proc_dir_entry *entry = NULL;
 317
 318
 319         if (!acpi_device_dir(device)) {
 320                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 321                                                      acpi_processor_dir);
 322                 if (!acpi_device_dir(device))
 323                         return -ENODEV;
 324         }
 325         acpi_device_dir(device)->owner = THIS_MODULE;
 326
 327         /* 'info' [R] */
 328         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 329                                   S_IRUGO, acpi_device_dir(device));
 330         if (!entry)
 331                 return -EIO;
 332         else {
 333                 entry->proc_fops = &acpi_processor_info_fops;
 334                 entry->data = acpi_driver_data(device);
 335                 entry->owner = THIS_MODULE;
 336         }
 337
 338         /* 'throttling' [R/W] */
 339         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 340                                   S_IFREG | S_IRUGO | S_IWUSR,
 341                                   acpi_device_dir(device));
 342         if (!entry)
 343                 return -EIO;
 344         else {
 345                 entry->proc_fops = &acpi_processor_throttling_fops;
 346                 entry->data = acpi_driver_data(device);
 347                 entry->owner = THIS_MODULE;
 348         }
 349
 350         /* 'limit' [R/W] */
 351         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 352                                   S_IFREG | S_IRUGO | S_IWUSR,
 353                                   acpi_device_dir(device));
 354         if (!entry)
 355                 return -EIO;
 356         else {
 357                 entry->proc_fops = &acpi_processor_limit_fops;
 358                 entry->data = acpi_driver_data(device);
 359                 entry->owner = THIS_MODULE;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int acpi_processor_remove_fs(struct acpi_device *device)
 366 {
 367
 368         if (acpi_device_dir(device)) {
 369                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 370                                   acpi_device_dir(device));
 371                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 372                                   acpi_device_dir(device));
 373                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 374                                   acpi_device_dir(device));
 375                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 376                 acpi_device_dir(device) = NULL;
 377         }
 378
 379         return 0;
 380 }
 381
 382 /* Use the acpiid in MADT to map cpus in case of SMP */
 383
 384 #ifndef CONFIG_SMP
 385 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 386 #else
 387
 388 static struct acpi_table_madt *madt;
 389
 390 static int map_lapic_id(struct acpi_subtable_header *entry,
 391                  u32 acpi_id, int *apic_id)
 392 {
 393         struct acpi_madt_local_apic *lapic =
 394                 (struct acpi_madt_local_apic *)entry;
 395         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 396             lapic->processor_id == acpi_id) {
 397                 *apic_id = lapic->id;
 398                 return 1;
 399         }
 400         return 0;
 401 }
 402
 403 static int map_lsapic_id(struct acpi_subtable_header *entry,
 404                   u32 acpi_id, int *apic_id)
 405 {
 406         struct acpi_madt_local_sapic *lsapic =
 407                 (struct acpi_madt_local_sapic *)entry;
 408         /* Only check enabled APICs*/
 409         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 410                 /* First check against id */
 411                 if (lsapic->processor_id == acpi_id) {
 412                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 413                         return 1;
 414                 /* Check against optional uid */
 415                 } else if (entry->length >= 16 &&
 416                         lsapic->uid == acpi_id) {
 417                         *apic_id = lsapic->uid;
 418                         return 1;
 419                 }
 420         }
 421         return 0;
 422 }
 423
 424 static int map_madt_entry(u32 acpi_id)
 425 {
 426         unsigned long madt_end, entry;
 427         int apic_id = -1;
 428
 429         if (!madt)
 430                 return apic_id;
 431
 432         entry = (unsigned long)madt;
 433         madt_end = entry + madt->header.length;
 434
 435         /* Parse all entries looking for a match. */
 436
 437         entry += sizeof(struct acpi_table_madt);
 438         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 439                 struct acpi_subtable_header *header =
 440                         (struct acpi_subtable_header *)entry;
 441                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 442                         if (map_lapic_id(header, acpi_id, &apic_id))
 443                                 break;
 444                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 445                         if (map_lsapic_id(header, acpi_id, &apic_id))
 446                                 break;
 447                 }
 448                 entry += header->length;
 449         }
 450         return apic_id;
 451 }
 452
 453 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 454 {
 455         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 456         union acpi_object *obj;
 457         struct acpi_subtable_header *header;
 458         int apic_id = -1;
 459
 460         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 461                 goto exit;
 462
 463         if (!buffer.length || !buffer.pointer)
 464                 goto exit;
 465
 466         obj = buffer.pointer;
 467         if (obj->type != ACPI_TYPE_BUFFER ||
 468             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 469                 goto exit;
 470         }
 471
 472         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 473         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 474                 map_lapic_id(header, acpi_id, &apic_id);
 475         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 476                 map_lsapic_id(header, acpi_id, &apic_id);
 477         }
 478
 479 exit:
 480         if (buffer.pointer)
 481                 kfree(buffer.pointer);
 482         return apic_id;
 483 }
 484
 485 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 486 {
 487         int i;
 488         int apic_id = -1;
 489
 490         apic_id = map_mat_entry(handle, acpi_id);
 491         if (apic_id == -1)
 492                 apic_id = map_madt_entry(acpi_id);
 493         if (apic_id == -1)
 494                 return apic_id;
 495
 496         for (i = 0; i < NR_CPUS; ++i) {
 497                 if (cpu_physical_id(i) == apic_id)
 498                         return i;
 499         }
 500         return -1;
 501 }
 502 #endif
 503
 504 /* --------------------------------------------------------------------------
 505                                  Driver Interface
 506    -------------------------------------------------------------------------- */
 507
 508 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 509 {
 510         acpi_status status = 0;
 511         union acpi_object object = { 0 };
 512         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 513         int cpu_index;
 514         static int cpu0_initialized;
 515
 516
 517         if (!pr)
 518                 return -EINVAL;
 519
 520         if (num_online_cpus() > 1)
 521                 errata.smp = TRUE;
 522
 523         acpi_processor_errata(pr);
 524
 525         /*
 526          * Check to see if we have bus mastering arbitration control.  This
 527          * is required for proper C3 usage (to maintain cache coherency).
 528          */
 529         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 530                 pr->flags.bm_control = 1;
 531                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 532                                   "Bus mastering arbitration control present\n"));
 533         } else
 534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 535                                   "No bus mastering arbitration control\n"));
 536
 537         /* Check if it is a Device with HID and UID */
 538         if (has_uid) {
 539                 unsigned long value;
 540                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 541                                                 NULL, &value);
 542                 if (ACPI_FAILURE(status)) {
 543                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 544                         return -ENODEV;
 545                 }
 546                 pr->acpi_id = value;
 547         } else {
 548                 /*
 549                 * Evalute the processor object.  Note that it is common on SMP to
 550                 * have the first (boot) processor with a valid PBLK address while
 551                 * all others have a NULL address.
 552                 */
 553                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 554                 if (ACPI_FAILURE(status)) {
 555                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 556                         return -ENODEV;
 557                 }
 558
 559                 /*
 560                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 561                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 562                 */
 563                 pr->acpi_id = object.processor.proc_id;
 564         }
 565         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 566
 567         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 568         if (!cpu0_initialized && (cpu_index == -1) &&
 569             (num_online_cpus() == 1)) {
 570                 cpu_index = 0;
 571         }
 572
 573         cpu0_initialized = 1;
 574
 575         pr->id = cpu_index;
 576
 577         /*
 578          *  Extra Processor objects may be enumerated on MP systems with
 579          *  less than the max # of CPUs. They should be ignored _iff
 580          *  they are physically not present.
 581          */
 582         if (pr->id == -1) {
 583                 if (ACPI_FAILURE
 584                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 585                         return -ENODEV;
 586                 }
 587         }
 588
 589         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 590                           pr->acpi_id));
 591
 592         if (!object.processor.pblk_address)
 593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 594         else if (object.processor.pblk_length != 6)
 595                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 596                             object.processor.pblk_length);
 597         else {
 598                 pr->throttling.address = object.processor.pblk_address;
 599                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 600                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 601
 602                 pr->pblk = object.processor.pblk_address;
 603
 604                 /*
 605                  * We don't care about error returns - we just try to mark
 606                  * these reserved so that nobody else is confused into thinking
 607                  * that this region might be unused..
 608                  *
 609                  * (In particular, allocating the IO range for Cardbus)
 610                  */
 611                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 612         }
 613
 614 #ifdef CONFIG_CPU_FREQ
 615         acpi_processor_ppc_has_changed(pr);
 616 #endif
 617         acpi_processor_get_throttling_info(pr);
 618         acpi_processor_get_limit_info(pr);
 619
 620         return 0;
 621 }
 622
 623 static void *processor_device_array[NR_CPUS];
 624
 625 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 626 {
 627         int result = 0;
 628         acpi_status status = AE_OK;
 629         struct acpi_processor *pr;
 630
 631
 632         pr = acpi_driver_data(device);
 633
 634         result = acpi_processor_get_info(pr, device->flags.unique_id);
 635         if (result) {
 636                 /* Processor is physically not present */
 637                 return 0;
 638         }
 639
 640         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 641
 642         /*
 643          * Buggy BIOS check
 644          * ACPI id of processors can be reported wrongly by the BIOS.
 645          * Don't trust it blindly
 646          */
 647         if (processor_device_array[pr->id] != NULL &&
 648             processor_device_array[pr->id] != device) {
 649                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 650                         "for the processor\n");
 651                 return -ENODEV;
 652         }
 653         processor_device_array[pr->id] = device;
 654
 655         processors[pr->id] = pr;
 656
 657         result = acpi_processor_add_fs(device);
 658         if (result)
 659                 goto end;
 660
 661         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 662                                              acpi_processor_notify, pr);
 663
 664         /* _PDC call should be done before doing anything else (if reqd.). */
 665         arch_acpi_processor_init_pdc(pr);
 666         acpi_processor_set_pdc(pr);
 667
 668         acpi_processor_power_init(pr, device);
 669
 670         if (pr->flags.throttling) {
 671                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 672                        acpi_device_name(device), acpi_device_bid(device));
 673                 printk(" %d throttling states", pr->throttling.state_count);
 674                 printk(")\n");
 675         }
 676
 677       end:
 678
 679         return result;
 680 }
 681
 682 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 683 {
 684         struct acpi_processor *pr = data;
 685         struct acpi_device *device = NULL;
 686
 687
 688         if (!pr)
 689                 return;
 690
 691         if (acpi_bus_get_device(pr->handle, &device))
 692                 return;
 693
 694         switch (event) {
 695         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 696                 acpi_processor_ppc_has_changed(pr);
 697                 acpi_bus_generate_proc_event(device, event,
 698                                         pr->performance_platform_limit);
 699                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 700                                                   device->dev.bus_id, event,
 701                                                   pr->performance_platform_limit);
 702                 break;
 703         case ACPI_PROCESSOR_NOTIFY_POWER:
 704                 acpi_processor_cst_has_changed(pr);
 705                 acpi_bus_generate_proc_event(device, event, 0);
 706                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 707                                                   device->dev.bus_id, event, 0);
 708                 break;
 709         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 710                 acpi_processor_tstate_has_changed(pr);
 711                 acpi_bus_generate_proc_event(device, event, 0);
 712                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 713                                                   device->dev.bus_id, event, 0);
 714         default:
 715                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 716                                   "Unsupported event [0x%x]\n", event));
 717                 break;
 718         }
 719
 720         return;
 721 }
 722
 723 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 724                 unsigned long action, void *hcpu)
 725 {
 726         unsigned int cpu = (unsigned long)hcpu;
 727         struct acpi_processor *pr = processors[cpu];
 728
 729         if (action == CPU_ONLINE && pr) {
 730                 acpi_processor_ppc_has_changed(pr);
 731                 acpi_processor_cst_has_changed(pr);
 732                 acpi_processor_tstate_has_changed(pr);
 733         }
 734         return NOTIFY_OK;
 735 }
 736
 737 static struct notifier_block acpi_cpu_notifier =
 738 {
 739             .notifier_call = acpi_cpu_soft_notify,
 740 };
 741
 742 static int acpi_processor_add(struct acpi_device *device)
 743 {
 744         struct acpi_processor *pr = NULL;
 745
 746
 747         if (!device)
 748                 return -EINVAL;
 749
 750         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 751         if (!pr)
 752                 return -ENOMEM;
 753
 754         pr->handle = device->handle;
 755         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 756         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 757         acpi_driver_data(device) = pr;
 758
 759         return 0;
 760 }
 761
 762 static int acpi_processor_remove(struct acpi_device *device, int type)
 763 {
 764         acpi_status status = AE_OK;
 765         struct acpi_processor *pr = NULL;
 766
 767
 768         if (!device || !acpi_driver_data(device))
 769                 return -EINVAL;
 770
 771         pr = acpi_driver_data(device);
 772
 773         if (pr->id >= NR_CPUS) {
 774                 kfree(pr);
 775                 return 0;
 776         }
 777
 778         if (type == ACPI_BUS_REMOVAL_EJECT) {
 779                 if (acpi_processor_handle_eject(pr))
 780                         return -EINVAL;
 781         }
 782
 783         acpi_processor_power_exit(pr, device);
 784
 785         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 786                                             acpi_processor_notify);
 787
 788         acpi_processor_remove_fs(device);
 789
 790         processors[pr->id] = NULL;
 791
 792         kfree(pr);
 793
 794         return 0;
 795 }
 796
 797 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 798 /****************************************************************************
 799  *      Acpi processor hotplug support                                      *
 800  ****************************************************************************/
 801
 802 static int is_processor_present(acpi_handle handle);
 803
 804 static int is_processor_present(acpi_handle handle)
 805 {
 806         acpi_status status;
 807         unsigned long sta = 0;
 808
 809
 810         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 811         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 812                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 813                 return 0;
 814         }
 815         return 1;
 816 }
 817
 818 static
 819 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 820 {
 821         acpi_handle phandle;
 822         struct acpi_device *pdev;
 823         struct acpi_processor *pr;
 824
 825
 826         if (acpi_get_parent(handle, &phandle)) {
 827                 return -ENODEV;
 828         }
 829
 830         if (acpi_bus_get_device(phandle, &pdev)) {
 831                 return -ENODEV;
 832         }
 833
 834         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 835                 return -ENODEV;
 836         }
 837
 838         acpi_bus_start(*device);
 839
 840         pr = acpi_driver_data(*device);
 841         if (!pr)
 842                 return -ENODEV;
 843
 844         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 845                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 846         }
 847         return 0;
 848 }
 849
 850 static void
 851 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 852 {
 853         struct acpi_processor *pr;
 854         struct acpi_device *device = NULL;
 855         int result;
 856
 857
 858         switch (event) {
 859         case ACPI_NOTIFY_BUS_CHECK:
 860         case ACPI_NOTIFY_DEVICE_CHECK:
 861                 printk("Processor driver received %s event\n",
 862                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 863                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 864
 865                 if (!is_processor_present(handle))
 866                         break;
 867
 868                 if (acpi_bus_get_device(handle, &device)) {
 869                         result = acpi_processor_device_add(handle, &device);
 870                         if (result)
 871                                 printk(KERN_ERR PREFIX
 872                                             "Unable to add the device\n");
 873                         break;
 874                 }
 875
 876                 pr = acpi_driver_data(device);
 877                 if (!pr) {
 878                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 879                         break;
 880                 }
 881
 882                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 883                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 884                         break;
 885                 }
 886
 887                 result = acpi_processor_start(device);
 888                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 889                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 890                 } else {
 891                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 892                                     acpi_device_bid(device));
 893                 }
 894                 break;
 895         case ACPI_NOTIFY_EJECT_REQUEST:
 896                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 897                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 898
 899                 if (acpi_bus_get_device(handle, &device)) {
 900                         printk(KERN_ERR PREFIX
 901                                     "Device don't exist, dropping EJECT\n");
 902                         break;
 903                 }
 904                 pr = acpi_driver_data(device);
 905                 if (!pr) {
 906                         printk(KERN_ERR PREFIX
 907                                     "Driver data is NULL, dropping EJECT\n");
 908                         return;
 909                 }
 910
 911                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 912                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 913                 break;
 914         default:
 915                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 916                                   "Unsupported event [0x%x]\n", event));
 917                 break;
 918         }
 919
 920         return;
 921 }
 922
 923 static acpi_status
 924 processor_walk_namespace_cb(acpi_handle handle,
 925                             u32 lvl, void *context, void **rv)
 926 {
 927         acpi_status status;
 928         int *action = context;
 929         acpi_object_type type = 0;
 930
 931         status = acpi_get_type(handle, &type);
 932         if (ACPI_FAILURE(status))
 933                 return (AE_OK);
 934
 935         if (type != ACPI_TYPE_PROCESSOR)
 936                 return (AE_OK);
 937
 938         switch (*action) {
 939         case INSTALL_NOTIFY_HANDLER:
 940                 acpi_install_notify_handler(handle,
 941                                             ACPI_SYSTEM_NOTIFY,
 942                                             acpi_processor_hotplug_notify,
 943                                             NULL);
 944                 break;
 945         case UNINSTALL_NOTIFY_HANDLER:
 946                 acpi_remove_notify_handler(handle,
 947                                            ACPI_SYSTEM_NOTIFY,
 948                                            acpi_processor_hotplug_notify);
 949                 break;
 950         default:
 951                 break;
 952         }
 953
 954         return (AE_OK);
 955 }
 956
 957 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 958 {
 959
 960         if (!is_processor_present(handle)) {
 961                 return AE_ERROR;
 962         }
 963
 964         if (acpi_map_lsapic(handle, p_cpu))
 965                 return AE_ERROR;
 966
 967         if (arch_register_cpu(*p_cpu)) {
 968                 acpi_unmap_lsapic(*p_cpu);
 969                 return AE_ERROR;
 970         }
 971
 972         return AE_OK;
 973 }
 974
 975 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 976 {
 977         if (cpu_online(pr->id)) {
 978                 return (-EINVAL);
 979         }
 980         arch_unregister_cpu(pr->id);
 981         acpi_unmap_lsapic(pr->id);
 982         return (0);
 983 }
 984 #else
 985 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 986 {
 987         return AE_ERROR;
 988 }
 989 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 990 {
 991         return (-EINVAL);
 992 }
 993 #endif
 994
 995 static
 996 void acpi_processor_install_hotplug_notify(void)
 997 {
 998 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 999         int action = INSTALL_NOTIFY_HANDLER;
1000         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1001                             ACPI_ROOT_OBJECT,
1002                             ACPI_UINT32_MAX,
1003                             processor_walk_namespace_cb, &action, NULL);
1004 #endif
1005         register_hotcpu_notifier(&acpi_cpu_notifier);
1006 }
1007
1008 static
1009 void acpi_processor_uninstall_hotplug_notify(void)
1010 {
1011 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1012         int action = UNINSTALL_NOTIFY_HANDLER;
1013         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1014                             ACPI_ROOT_OBJECT,
1015                             ACPI_UINT32_MAX,
1016                             processor_walk_namespace_cb, &action, NULL);
1017 #endif
1018         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1019 }
1020
1021 /*
1022  * We keep the driver loaded even when ACPI is not running.
1023  * This is needed for the powernow-k8 driver, that works even without
1024  * ACPI, but needs symbols from this driver
1025  */
1026
1027 static int __init acpi_processor_init(void)
1028 {
1029         int result = 0;
1030
1031
1032         memset(&processors, 0, sizeof(processors));
1033         memset(&errata, 0, sizeof(errata));
1034
1035 #ifdef CONFIG_SMP
1036         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1037                                 (struct acpi_table_header **)&madt)))
1038                 madt = NULL;
1039 #endif
1040
1041         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1042         if (!acpi_processor_dir)
1043                 return -ENOMEM;
1044         acpi_processor_dir->owner = THIS_MODULE;
1045
1046         result = acpi_bus_register_driver(&acpi_processor_driver);
1047         if (result < 0) {
1048                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1049                 return result;
1050         }
1051
1052         acpi_processor_install_hotplug_notify();
1053
1054         acpi_thermal_cpufreq_init();
1055
1056         acpi_processor_ppc_init();
1057
1058         return 0;
1059 }
1060
1061 static void __exit acpi_processor_exit(void)
1062 {
1063
1064         acpi_processor_ppc_exit();
1065
1066         acpi_thermal_cpufreq_exit();
1067
1068         acpi_processor_uninstall_hotplug_notify();
1069
1070         acpi_bus_unregister_driver(&acpi_processor_driver);
1071
1072         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1073
1074         return;
1075 }
1076
1077 module_init(acpi_processor_init);
1078 module_exit(acpi_processor_exit);
1079
1080 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1081
1082 MODULE_ALIAS("processor");