drivers/acpi/processor_core.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47
  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 struct acpi_driver acpi_processor_driver = {
  92         .name = "processor",
  93         .class = ACPI_PROCESSOR_CLASS,
  94         .ids = ACPI_PROCESSOR_HID,
  95         .ops = {
  96                 .add = acpi_processor_add,
  97                 .remove = acpi_processor_remove,
  98                 .start = acpi_processor_start,
  99                 },
 100 };
 101
 102 #define INSTALL_NOTIFY_HANDLER          1
 103 #define UNINSTALL_NOTIFY_HANDLER        2
 104
 105 static const struct file_operations acpi_processor_info_fops = {
 106         .open = acpi_processor_info_open_fs,
 107         .read = seq_read,
 108         .llseek = seq_lseek,
 109         .release = single_release,
 110 };
 111
 112 struct acpi_processor *processors[NR_CPUS];
 113 struct acpi_processor_errata errata __read_mostly;
 114
 115 /* --------------------------------------------------------------------------
 116                                 Errata Handling
 117    -------------------------------------------------------------------------- */
 118
 119 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 120 {
 121         u8 value1 = 0;
 122         u8 value2 = 0;
 123
 124
 125         if (!dev)
 126                 return -EINVAL;
 127
 128         /*
 129          * Note that 'dev' references the PIIX4 ACPI Controller.
 130          */
 131
 132         switch (dev->revision) {
 133         case 0:
 134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 135                 break;
 136         case 1:
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 138                 break;
 139         case 2:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 141                 break;
 142         case 3:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 144                 break;
 145         default:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 147                 break;
 148         }
 149
 150         switch (dev->revision) {
 151
 152         case 0:         /* PIIX4 A-step */
 153         case 1:         /* PIIX4 B-step */
 154                 /*
 155                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 156                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 157                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 158                  * 2002 PIIX4 specification update.  Applies to only older
 159                  * PIIX4 models.
 160                  */
 161                 errata.piix4.throttle = 1;
 162
 163         case 2:         /* PIIX4E */
 164         case 3:         /* PIIX4M */
 165                 /*
 166                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 167                  * Livelock") from the January 2002 PIIX4 specification update.
 168                  * Applies to all PIIX4 models.
 169                  */
 170
 171                 /*
 172                  * BM-IDE
 173                  * ------
 174                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 175                  * Status register address.  We'll use this later to read
 176                  * each IDE controller's DMA status to make sure we catch all
 177                  * DMA activity.
 178                  */
 179                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 180                                      PCI_DEVICE_ID_INTEL_82371AB,
 181                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 182                 if (dev) {
 183                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 184                         pci_dev_put(dev);
 185                 }
 186
 187                 /*
 188                  * Type-F DMA
 189                  * ----------
 190                  * Find the PIIX4 ISA Controller and read the Motherboard
 191                  * DMA controller's status to see if Type-F (Fast) DMA mode
 192                  * is enabled (bit 7) on either channel.  Note that we'll
 193                  * disable C3 support if this is enabled, as some legacy
 194                  * devices won't operate well if fast DMA is disabled.
 195                  */
 196                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 197                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 198                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 199                 if (dev) {
 200                         pci_read_config_byte(dev, 0x76, &value1);
 201                         pci_read_config_byte(dev, 0x77, &value2);
 202                         if ((value1 & 0x80) || (value2 & 0x80))
 203                                 errata.piix4.fdma = 1;
 204                         pci_dev_put(dev);
 205                 }
 206
 207                 break;
 208         }
 209
 210         if (errata.piix4.bmisx)
 211                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 212                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 213         if (errata.piix4.fdma)
 214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 215                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 216
 217         return 0;
 218 }
 219
 220 static int acpi_processor_errata(struct acpi_processor *pr)
 221 {
 222         int result = 0;
 223         struct pci_dev *dev = NULL;
 224
 225
 226         if (!pr)
 227                 return -EINVAL;
 228
 229         /*
 230          * PIIX4
 231          */
 232         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 233                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 234                              PCI_ANY_ID, NULL);
 235         if (dev) {
 236                 result = acpi_processor_errata_piix4(dev);
 237                 pci_dev_put(dev);
 238         }
 239
 240         return result;
 241 }
 242
 243 /* --------------------------------------------------------------------------
 244                               Common ACPI processor functions
 245    -------------------------------------------------------------------------- */
 246
 247 /*
 248  * _PDC is required for a BIOS-OS handshake for most of the newer
 249  * ACPI processor features.
 250  */
 251 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 252 {
 253         struct acpi_object_list *pdc_in = pr->pdc;
 254         acpi_status status = AE_OK;
 255
 256
 257         if (!pdc_in)
 258                 return status;
 259
 260         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 261
 262         if (ACPI_FAILURE(status))
 263                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 264                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 265
 266         return status;
 267 }
 268
 269 /* --------------------------------------------------------------------------
 270                               FS Interface (/proc)
 271    -------------------------------------------------------------------------- */
 272
 273 static struct proc_dir_entry *acpi_processor_dir = NULL;
 274
 275 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 276 {
 277         struct acpi_processor *pr = seq->private;
 278
 279
 280         if (!pr)
 281                 goto end;
 282
 283         seq_printf(seq, "processor id:            %d\n"
 284                    "acpi id:                 %d\n"
 285                    "bus mastering control:   %s\n"
 286                    "power management:        %s\n"
 287                    "throttling control:      %s\n"
 288                    "limit interface:         %s\n",
 289                    pr->id,
 290                    pr->acpi_id,
 291                    pr->flags.bm_control ? "yes" : "no",
 292                    pr->flags.power ? "yes" : "no",
 293                    pr->flags.throttling ? "yes" : "no",
 294                    pr->flags.limit ? "yes" : "no");
 295
 296       end:
 297         return 0;
 298 }
 299
 300 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 301 {
 302         return single_open(file, acpi_processor_info_seq_show,
 303                            PDE(inode)->data);
 304 }
 305
 306 static int acpi_processor_add_fs(struct acpi_device *device)
 307 {
 308         struct proc_dir_entry *entry = NULL;
 309
 310
 311         if (!acpi_device_dir(device)) {
 312                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 313                                                      acpi_processor_dir);
 314                 if (!acpi_device_dir(device))
 315                         return -ENODEV;
 316         }
 317         acpi_device_dir(device)->owner = THIS_MODULE;
 318
 319         /* 'info' [R] */
 320         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 321                                   S_IRUGO, acpi_device_dir(device));
 322         if (!entry)
 323                 return -EIO;
 324         else {
 325                 entry->proc_fops = &acpi_processor_info_fops;
 326                 entry->data = acpi_driver_data(device);
 327                 entry->owner = THIS_MODULE;
 328         }
 329
 330         /* 'throttling' [R/W] */
 331         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 332                                   S_IFREG | S_IRUGO | S_IWUSR,
 333                                   acpi_device_dir(device));
 334         if (!entry)
 335                 return -EIO;
 336         else {
 337                 entry->proc_fops = &acpi_processor_throttling_fops;
 338                 entry->data = acpi_driver_data(device);
 339                 entry->owner = THIS_MODULE;
 340         }
 341
 342         /* 'limit' [R/W] */
 343         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 344                                   S_IFREG | S_IRUGO | S_IWUSR,
 345                                   acpi_device_dir(device));
 346         if (!entry)
 347                 return -EIO;
 348         else {
 349                 entry->proc_fops = &acpi_processor_limit_fops;
 350                 entry->data = acpi_driver_data(device);
 351                 entry->owner = THIS_MODULE;
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int acpi_processor_remove_fs(struct acpi_device *device)
 358 {
 359
 360         if (acpi_device_dir(device)) {
 361                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 362                                   acpi_device_dir(device));
 363                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 364                                   acpi_device_dir(device));
 365                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 366                                   acpi_device_dir(device));
 367                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 368                 acpi_device_dir(device) = NULL;
 369         }
 370
 371         return 0;
 372 }
 373
 374 /* Use the acpiid in MADT to map cpus in case of SMP */
 375
 376 #ifndef CONFIG_SMP
 377 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 378 #else
 379
 380 static struct acpi_table_madt *madt;
 381
 382 static int map_lapic_id(struct acpi_subtable_header *entry,
 383                  u32 acpi_id, int *apic_id)
 384 {
 385         struct acpi_madt_local_apic *lapic =
 386                 (struct acpi_madt_local_apic *)entry;
 387         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 388             lapic->processor_id == acpi_id) {
 389                 *apic_id = lapic->id;
 390                 return 1;
 391         }
 392         return 0;
 393 }
 394
 395 static int map_lsapic_id(struct acpi_subtable_header *entry,
 396                   u32 acpi_id, int *apic_id)
 397 {
 398         struct acpi_madt_local_sapic *lsapic =
 399                 (struct acpi_madt_local_sapic *)entry;
 400         /* Only check enabled APICs*/
 401         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 402                 /* First check against id */
 403                 if (lsapic->processor_id == acpi_id) {
 404                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 405                         return 1;
 406                 /* Check against optional uid */
 407                 } else if (entry->length >= 16 &&
 408                         lsapic->uid == acpi_id) {
 409                         *apic_id = lsapic->uid;
 410                         return 1;
 411                 }
 412         }
 413         return 0;
 414 }
 415
 416 #ifdef CONFIG_IA64
 417 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 418 #else
 419 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 420 #endif
 421
 422 static int map_madt_entry(u32 acpi_id)
 423 {
 424         unsigned long madt_end, entry;
 425         int apic_id = -1;
 426
 427         if (!madt)
 428                 return apic_id;
 429
 430         entry = (unsigned long)madt;
 431         madt_end = entry + madt->header.length;
 432
 433         /* Parse all entries looking for a match. */
 434
 435         entry += sizeof(struct acpi_table_madt);
 436         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 437                 struct acpi_subtable_header *header =
 438                         (struct acpi_subtable_header *)entry;
 439                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 440                         if (map_lapic_id(header, acpi_id, &apic_id))
 441                                 break;
 442                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 443                         if (map_lsapic_id(header, acpi_id, &apic_id))
 444                                 break;
 445                 }
 446                 entry += header->length;
 447         }
 448         return apic_id;
 449 }
 450
 451 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 452 {
 453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 454         union acpi_object *obj;
 455         struct acpi_subtable_header *header;
 456         int apic_id = -1;
 457
 458         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 459                 goto exit;
 460
 461         if (!buffer.length || !buffer.pointer)
 462                 goto exit;
 463
 464         obj = buffer.pointer;
 465         if (obj->type != ACPI_TYPE_BUFFER ||
 466             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 467                 goto exit;
 468         }
 469
 470         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 471         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 472                 map_lapic_id(header, acpi_id, &apic_id);
 473         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 474                 map_lsapic_id(header, acpi_id, &apic_id);
 475         }
 476
 477 exit:
 478         if (buffer.pointer)
 479                 kfree(buffer.pointer);
 480         return apic_id;
 481 }
 482
 483 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 484 {
 485         int i;
 486         int apic_id = -1;
 487
 488         apic_id = map_mat_entry(handle, acpi_id);
 489         if (apic_id == -1)
 490                 apic_id = map_madt_entry(acpi_id);
 491         if (apic_id == -1)
 492                 return apic_id;
 493
 494         for (i = 0; i < NR_CPUS; ++i) {
 495                 if (arch_cpu_to_apicid[i] == apic_id)
 496                         return i;
 497         }
 498         return -1;
 499 }
 500 #endif
 501
 502 /* --------------------------------------------------------------------------
 503                                  Driver Interface
 504    -------------------------------------------------------------------------- */
 505
 506 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 507 {
 508         acpi_status status = 0;
 509         union acpi_object object = { 0 };
 510         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 511         int cpu_index;
 512         static int cpu0_initialized;
 513
 514
 515         if (!pr)
 516                 return -EINVAL;
 517
 518         if (num_online_cpus() > 1)
 519                 errata.smp = TRUE;
 520
 521         acpi_processor_errata(pr);
 522
 523         /*
 524          * Check to see if we have bus mastering arbitration control.  This
 525          * is required for proper C3 usage (to maintain cache coherency).
 526          */
 527         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 528                 pr->flags.bm_control = 1;
 529                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 530                                   "Bus mastering arbitration control present\n"));
 531         } else
 532                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 533                                   "No bus mastering arbitration control\n"));
 534
 535         /* Check if it is a Device with HID and UID */
 536         if (has_uid) {
 537                 unsigned long value;
 538                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 539                                                 NULL, &value);
 540                 if (ACPI_FAILURE(status)) {
 541                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 542                         return -ENODEV;
 543                 }
 544                 pr->acpi_id = value;
 545         } else {
 546                 /*
 547                 * Evalute the processor object.  Note that it is common on SMP to
 548                 * have the first (boot) processor with a valid PBLK address while
 549                 * all others have a NULL address.
 550                 */
 551                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 552                 if (ACPI_FAILURE(status)) {
 553                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 554                         return -ENODEV;
 555                 }
 556
 557                 /*
 558                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 559                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 560                 */
 561                 pr->acpi_id = object.processor.proc_id;
 562         }
 563         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 564
 565         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 566         if (!cpu0_initialized && (cpu_index == -1) &&
 567             (num_online_cpus() == 1)) {
 568                 cpu_index = 0;
 569         }
 570
 571         cpu0_initialized = 1;
 572
 573         pr->id = cpu_index;
 574
 575         /*
 576          *  Extra Processor objects may be enumerated on MP systems with
 577          *  less than the max # of CPUs. They should be ignored _iff
 578          *  they are physically not present.
 579          */
 580         if (pr->id == -1) {
 581                 if (ACPI_FAILURE
 582                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 583                         return -ENODEV;
 584                 }
 585         }
 586
 587         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 588                           pr->acpi_id));
 589
 590         if (!object.processor.pblk_address)
 591                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 592         else if (object.processor.pblk_length != 6)
 593                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 594                             object.processor.pblk_length);
 595         else {
 596                 pr->throttling.address = object.processor.pblk_address;
 597                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 598                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 599
 600                 pr->pblk = object.processor.pblk_address;
 601
 602                 /*
 603                  * We don't care about error returns - we just try to mark
 604                  * these reserved so that nobody else is confused into thinking
 605                  * that this region might be unused..
 606                  *
 607                  * (In particular, allocating the IO range for Cardbus)
 608                  */
 609                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 610         }
 611
 612 #ifdef CONFIG_CPU_FREQ
 613         acpi_processor_ppc_has_changed(pr);
 614 #endif
 615         acpi_processor_get_throttling_info(pr);
 616         acpi_processor_get_limit_info(pr);
 617
 618         return 0;
 619 }
 620
 621 static void *processor_device_array[NR_CPUS];
 622
 623 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 624 {
 625         int result = 0;
 626         acpi_status status = AE_OK;
 627         struct acpi_processor *pr;
 628
 629
 630         pr = acpi_driver_data(device);
 631
 632         result = acpi_processor_get_info(pr, device->flags.unique_id);
 633         if (result) {
 634                 /* Processor is physically not present */
 635                 return 0;
 636         }
 637
 638         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 639
 640         /*
 641          * Buggy BIOS check
 642          * ACPI id of processors can be reported wrongly by the BIOS.
 643          * Don't trust it blindly
 644          */
 645         if (processor_device_array[pr->id] != NULL &&
 646             processor_device_array[pr->id] != device) {
 647                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 648                         "for the processor\n");
 649                 return -ENODEV;
 650         }
 651         processor_device_array[pr->id] = device;
 652
 653         processors[pr->id] = pr;
 654
 655         result = acpi_processor_add_fs(device);
 656         if (result)
 657                 goto end;
 658
 659         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 660                                              acpi_processor_notify, pr);
 661
 662         /* _PDC call should be done before doing anything else (if reqd.). */
 663         arch_acpi_processor_init_pdc(pr);
 664         acpi_processor_set_pdc(pr);
 665
 666         acpi_processor_power_init(pr, device);
 667
 668         if (pr->flags.throttling) {
 669                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 670                        acpi_device_name(device), acpi_device_bid(device));
 671                 printk(" %d throttling states", pr->throttling.state_count);
 672                 printk(")\n");
 673         }
 674
 675       end:
 676
 677         return result;
 678 }
 679
 680 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 681 {
 682         struct acpi_processor *pr = data;
 683         struct acpi_device *device = NULL;
 684
 685
 686         if (!pr)
 687                 return;
 688
 689         if (acpi_bus_get_device(pr->handle, &device))
 690                 return;
 691
 692         switch (event) {
 693         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 694                 acpi_processor_ppc_has_changed(pr);
 695                 acpi_bus_generate_event(device, event,
 696                                         pr->performance_platform_limit);
 697                 break;
 698         case ACPI_PROCESSOR_NOTIFY_POWER:
 699                 acpi_processor_cst_has_changed(pr);
 700                 acpi_bus_generate_event(device, event, 0);
 701                 break;
 702         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 703                 acpi_processor_tstate_has_changed(pr);
 704                 acpi_bus_generate_event(device, event, 0);
 705         default:
 706                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 707                                   "Unsupported event [0x%x]\n", event));
 708                 break;
 709         }
 710
 711         return;
 712 }
 713
 714 static int acpi_processor_add(struct acpi_device *device)
 715 {
 716         struct acpi_processor *pr = NULL;
 717
 718
 719         if (!device)
 720                 return -EINVAL;
 721
 722         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 723         if (!pr)
 724                 return -ENOMEM;
 725
 726         pr->handle = device->handle;
 727         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 728         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 729         acpi_driver_data(device) = pr;
 730
 731         return 0;
 732 }
 733
 734 static int acpi_processor_remove(struct acpi_device *device, int type)
 735 {
 736         acpi_status status = AE_OK;
 737         struct acpi_processor *pr = NULL;
 738
 739
 740         if (!device || !acpi_driver_data(device))
 741                 return -EINVAL;
 742
 743         pr = acpi_driver_data(device);
 744
 745         if (pr->id >= NR_CPUS) {
 746                 kfree(pr);
 747                 return 0;
 748         }
 749
 750         if (type == ACPI_BUS_REMOVAL_EJECT) {
 751                 if (acpi_processor_handle_eject(pr))
 752                         return -EINVAL;
 753         }
 754
 755         acpi_processor_power_exit(pr, device);
 756
 757         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 758                                             acpi_processor_notify);
 759
 760         acpi_processor_remove_fs(device);
 761
 762         processors[pr->id] = NULL;
 763
 764         kfree(pr);
 765
 766         return 0;
 767 }
 768
 769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 770 /****************************************************************************
 771  *      Acpi processor hotplug support                                      *
 772  ****************************************************************************/
 773
 774 static int is_processor_present(acpi_handle handle);
 775
 776 static int is_processor_present(acpi_handle handle)
 777 {
 778         acpi_status status;
 779         unsigned long sta = 0;
 780
 781
 782         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 783         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 784                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 785                 return 0;
 786         }
 787         return 1;
 788 }
 789
 790 static
 791 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 792 {
 793         acpi_handle phandle;
 794         struct acpi_device *pdev;
 795         struct acpi_processor *pr;
 796
 797
 798         if (acpi_get_parent(handle, &phandle)) {
 799                 return -ENODEV;
 800         }
 801
 802         if (acpi_bus_get_device(phandle, &pdev)) {
 803                 return -ENODEV;
 804         }
 805
 806         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 807                 return -ENODEV;
 808         }
 809
 810         acpi_bus_start(*device);
 811
 812         pr = acpi_driver_data(*device);
 813         if (!pr)
 814                 return -ENODEV;
 815
 816         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 817                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 818         }
 819         return 0;
 820 }
 821
 822 static void
 823 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 824 {
 825         struct acpi_processor *pr;
 826         struct acpi_device *device = NULL;
 827         int result;
 828
 829
 830         switch (event) {
 831         case ACPI_NOTIFY_BUS_CHECK:
 832         case ACPI_NOTIFY_DEVICE_CHECK:
 833                 printk("Processor driver received %s event\n",
 834                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 835                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 836
 837                 if (!is_processor_present(handle))
 838                         break;
 839
 840                 if (acpi_bus_get_device(handle, &device)) {
 841                         result = acpi_processor_device_add(handle, &device);
 842                         if (result)
 843                                 printk(KERN_ERR PREFIX
 844                                             "Unable to add the device\n");
 845                         break;
 846                 }
 847
 848                 pr = acpi_driver_data(device);
 849                 if (!pr) {
 850                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 851                         break;
 852                 }
 853
 854                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 855                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 856                         break;
 857                 }
 858
 859                 result = acpi_processor_start(device);
 860                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 861                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 862                 } else {
 863                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 864                                     acpi_device_bid(device));
 865                 }
 866                 break;
 867         case ACPI_NOTIFY_EJECT_REQUEST:
 868                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 869                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 870
 871                 if (acpi_bus_get_device(handle, &device)) {
 872                         printk(KERN_ERR PREFIX
 873                                     "Device don't exist, dropping EJECT\n");
 874                         break;
 875                 }
 876                 pr = acpi_driver_data(device);
 877                 if (!pr) {
 878                         printk(KERN_ERR PREFIX
 879                                     "Driver data is NULL, dropping EJECT\n");
 880                         return;
 881                 }
 882
 883                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 884                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 885                 break;
 886         default:
 887                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 888                                   "Unsupported event [0x%x]\n", event));
 889                 break;
 890         }
 891
 892         return;
 893 }
 894
 895 static acpi_status
 896 processor_walk_namespace_cb(acpi_handle handle,
 897                             u32 lvl, void *context, void **rv)
 898 {
 899         acpi_status status;
 900         int *action = context;
 901         acpi_object_type type = 0;
 902
 903         status = acpi_get_type(handle, &type);
 904         if (ACPI_FAILURE(status))
 905                 return (AE_OK);
 906
 907         if (type != ACPI_TYPE_PROCESSOR)
 908                 return (AE_OK);
 909
 910         switch (*action) {
 911         case INSTALL_NOTIFY_HANDLER:
 912                 acpi_install_notify_handler(handle,
 913                                             ACPI_SYSTEM_NOTIFY,
 914                                             acpi_processor_hotplug_notify,
 915                                             NULL);
 916                 break;
 917         case UNINSTALL_NOTIFY_HANDLER:
 918                 acpi_remove_notify_handler(handle,
 919                                            ACPI_SYSTEM_NOTIFY,
 920                                            acpi_processor_hotplug_notify);
 921                 break;
 922         default:
 923                 break;
 924         }
 925
 926         return (AE_OK);
 927 }
 928
 929 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 930 {
 931
 932         if (!is_processor_present(handle)) {
 933                 return AE_ERROR;
 934         }
 935
 936         if (acpi_map_lsapic(handle, p_cpu))
 937                 return AE_ERROR;
 938
 939         if (arch_register_cpu(*p_cpu)) {
 940                 acpi_unmap_lsapic(*p_cpu);
 941                 return AE_ERROR;
 942         }
 943
 944         return AE_OK;
 945 }
 946
 947 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 948 {
 949         if (cpu_online(pr->id)) {
 950                 return (-EINVAL);
 951         }
 952         arch_unregister_cpu(pr->id);
 953         acpi_unmap_lsapic(pr->id);
 954         return (0);
 955 }
 956 #else
 957 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 958 {
 959         return AE_ERROR;
 960 }
 961 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 962 {
 963         return (-EINVAL);
 964 }
 965 #endif
 966
 967 static
 968 void acpi_processor_install_hotplug_notify(void)
 969 {
 970 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 971         int action = INSTALL_NOTIFY_HANDLER;
 972         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 973                             ACPI_ROOT_OBJECT,
 974                             ACPI_UINT32_MAX,
 975                             processor_walk_namespace_cb, &action, NULL);
 976 #endif
 977 }
 978
 979 static
 980 void acpi_processor_uninstall_hotplug_notify(void)
 981 {
 982 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 983         int action = UNINSTALL_NOTIFY_HANDLER;
 984         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 985                             ACPI_ROOT_OBJECT,
 986                             ACPI_UINT32_MAX,
 987                             processor_walk_namespace_cb, &action, NULL);
 988 #endif
 989 }
 990
 991 /*
 992  * We keep the driver loaded even when ACPI is not running.
 993  * This is needed for the powernow-k8 driver, that works even without
 994  * ACPI, but needs symbols from this driver
 995  */
 996
 997 static int __init acpi_processor_init(void)
 998 {
 999         int result = 0;
1000
1001
1002         memset(&processors, 0, sizeof(processors));
1003         memset(&errata, 0, sizeof(errata));
1004
1005 #ifdef CONFIG_SMP
1006         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1007                                 (struct acpi_table_header **)&madt)))
1008                 madt = NULL;
1009 #endif
1010
1011         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1012         if (!acpi_processor_dir)
1013                 return -ENOMEM;
1014         acpi_processor_dir->owner = THIS_MODULE;
1015
1016         result = acpi_bus_register_driver(&acpi_processor_driver);
1017         if (result < 0) {
1018                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1019                 return result;
1020         }
1021
1022         acpi_processor_install_hotplug_notify();
1023
1024         acpi_thermal_cpufreq_init();
1025
1026         acpi_processor_ppc_init();
1027
1028         return 0;
1029 }
1030
1031 static void __exit acpi_processor_exit(void)
1032 {
1033
1034         acpi_processor_ppc_exit();
1035
1036         acpi_thermal_cpufreq_exit();
1037
1038         acpi_processor_uninstall_hotplug_notify();
1039
1040         acpi_bus_unregister_driver(&acpi_processor_driver);
1041
1042         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1043
1044         return;
1045 }
1046
1047 module_init(acpi_processor_init);
1048 module_exit(acpi_processor_exit);
1049
1050 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1051
1052 MODULE_ALIAS("processor");