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
  70 #define ACPI_PROCESSOR_LIMIT_USER       0
  71 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  72
  73 #define ACPI_STA_PRESENT 0x00000001
  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 static struct acpi_driver acpi_processor_driver = {
  91         .name = "processor",
  92         .class = ACPI_PROCESSOR_CLASS,
  93         .ids = ACPI_PROCESSOR_HID,
  94         .ops = {
  95                 .add = acpi_processor_add,
  96                 .remove = acpi_processor_remove,
  97                 .start = acpi_processor_start,
  98                 },
  99 };
 100
 101 #define INSTALL_NOTIFY_HANDLER          1
 102 #define UNINSTALL_NOTIFY_HANDLER        2
 103
 104 static const struct file_operations acpi_processor_info_fops = {
 105         .open = acpi_processor_info_open_fs,
 106         .read = seq_read,
 107         .llseek = seq_lseek,
 108         .release = single_release,
 109 };
 110
 111 struct acpi_processor *processors[NR_CPUS];
 112 struct acpi_processor_errata errata __read_mostly;
 113
 114 /* --------------------------------------------------------------------------
 115                                 Errata Handling
 116    -------------------------------------------------------------------------- */
 117
 118 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 119 {
 120         u8 rev = 0;
 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         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 133
 134         switch (rev) {
 135         case 0:
 136                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 137                 break;
 138         case 1:
 139                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 140                 break;
 141         case 2:
 142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 143                 break;
 144         case 3:
 145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 146                 break;
 147         default:
 148                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 149                 break;
 150         }
 151
 152         switch (rev) {
 153
 154         case 0:         /* PIIX4 A-step */
 155         case 1:         /* PIIX4 B-step */
 156                 /*
 157                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 158                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 159                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 160                  * 2002 PIIX4 specification update.  Applies to only older
 161                  * PIIX4 models.
 162                  */
 163                 errata.piix4.throttle = 1;
 164
 165         case 2:         /* PIIX4E */
 166         case 3:         /* PIIX4M */
 167                 /*
 168                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 169                  * Livelock") from the January 2002 PIIX4 specification update.
 170                  * Applies to all PIIX4 models.
 171                  */
 172
 173                 /*
 174                  * BM-IDE
 175                  * ------
 176                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 177                  * Status register address.  We'll use this later to read
 178                  * each IDE controller's DMA status to make sure we catch all
 179                  * DMA activity.
 180                  */
 181                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 182                                      PCI_DEVICE_ID_INTEL_82371AB,
 183                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 184                 if (dev) {
 185                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 186                         pci_dev_put(dev);
 187                 }
 188
 189                 /*
 190                  * Type-F DMA
 191                  * ----------
 192                  * Find the PIIX4 ISA Controller and read the Motherboard
 193                  * DMA controller's status to see if Type-F (Fast) DMA mode
 194                  * is enabled (bit 7) on either channel.  Note that we'll
 195                  * disable C3 support if this is enabled, as some legacy
 196                  * devices won't operate well if fast DMA is disabled.
 197                  */
 198                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 199                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 200                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 201                 if (dev) {
 202                         pci_read_config_byte(dev, 0x76, &value1);
 203                         pci_read_config_byte(dev, 0x77, &value2);
 204                         if ((value1 & 0x80) || (value2 & 0x80))
 205                                 errata.piix4.fdma = 1;
 206                         pci_dev_put(dev);
 207                 }
 208
 209                 break;
 210         }
 211
 212         if (errata.piix4.bmisx)
 213                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 214                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 215         if (errata.piix4.fdma)
 216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 217                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 218
 219         return 0;
 220 }
 221
 222 static int acpi_processor_errata(struct acpi_processor *pr)
 223 {
 224         int result = 0;
 225         struct pci_dev *dev = NULL;
 226
 227
 228         if (!pr)
 229                 return -EINVAL;
 230
 231         /*
 232          * PIIX4
 233          */
 234         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 235                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 236                              PCI_ANY_ID, NULL);
 237         if (dev) {
 238                 result = acpi_processor_errata_piix4(dev);
 239                 pci_dev_put(dev);
 240         }
 241
 242         return result;
 243 }
 244
 245 /* --------------------------------------------------------------------------
 246                               Common ACPI processor functions
 247    -------------------------------------------------------------------------- */
 248
 249 /*
 250  * _PDC is required for a BIOS-OS handshake for most of the newer
 251  * ACPI processor features.
 252  */
 253 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 254 {
 255         struct acpi_object_list *pdc_in = pr->pdc;
 256         acpi_status status = AE_OK;
 257
 258
 259         if (!pdc_in)
 260                 return status;
 261
 262         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 263
 264         if (ACPI_FAILURE(status))
 265                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 266                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 267
 268         return status;
 269 }
 270
 271 /* --------------------------------------------------------------------------
 272                               FS Interface (/proc)
 273    -------------------------------------------------------------------------- */
 274
 275 static struct proc_dir_entry *acpi_processor_dir = NULL;
 276
 277 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 278 {
 279         struct acpi_processor *pr = seq->private;
 280
 281
 282         if (!pr)
 283                 goto end;
 284
 285         seq_printf(seq, "processor id:            %d\n"
 286                    "acpi id:                 %d\n"
 287                    "bus mastering control:   %s\n"
 288                    "power management:        %s\n"
 289                    "throttling control:      %s\n"
 290                    "limit interface:         %s\n",
 291                    pr->id,
 292                    pr->acpi_id,
 293                    pr->flags.bm_control ? "yes" : "no",
 294                    pr->flags.power ? "yes" : "no",
 295                    pr->flags.throttling ? "yes" : "no",
 296                    pr->flags.limit ? "yes" : "no");
 297
 298       end:
 299         return 0;
 300 }
 301
 302 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 303 {
 304         return single_open(file, acpi_processor_info_seq_show,
 305                            PDE(inode)->data);
 306 }
 307
 308 static int acpi_processor_add_fs(struct acpi_device *device)
 309 {
 310         struct proc_dir_entry *entry = NULL;
 311
 312
 313         if (!acpi_device_dir(device)) {
 314                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 315                                                      acpi_processor_dir);
 316                 if (!acpi_device_dir(device))
 317                         return -ENODEV;
 318         }
 319         acpi_device_dir(device)->owner = THIS_MODULE;
 320
 321         /* 'info' [R] */
 322         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 323                                   S_IRUGO, acpi_device_dir(device));
 324         if (!entry)
 325                 return -EIO;
 326         else {
 327                 entry->proc_fops = &acpi_processor_info_fops;
 328                 entry->data = acpi_driver_data(device);
 329                 entry->owner = THIS_MODULE;
 330         }
 331
 332         /* 'throttling' [R/W] */
 333         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 334                                   S_IFREG | S_IRUGO | S_IWUSR,
 335                                   acpi_device_dir(device));
 336         if (!entry)
 337                 return -EIO;
 338         else {
 339                 entry->proc_fops = &acpi_processor_throttling_fops;
 340                 entry->data = acpi_driver_data(device);
 341                 entry->owner = THIS_MODULE;
 342         }
 343
 344         /* 'limit' [R/W] */
 345         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 346                                   S_IFREG | S_IRUGO | S_IWUSR,
 347                                   acpi_device_dir(device));
 348         if (!entry)
 349                 return -EIO;
 350         else {
 351                 entry->proc_fops = &acpi_processor_limit_fops;
 352                 entry->data = acpi_driver_data(device);
 353                 entry->owner = THIS_MODULE;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int acpi_processor_remove_fs(struct acpi_device *device)
 360 {
 361
 362         if (acpi_device_dir(device)) {
 363                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 364                                   acpi_device_dir(device));
 365                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 366                                   acpi_device_dir(device));
 367                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 368                                   acpi_device_dir(device));
 369                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 370                 acpi_device_dir(device) = NULL;
 371         }
 372
 373         return 0;
 374 }
 375
 376 /* Use the acpiid in MADT to map cpus in case of SMP */
 377
 378 #ifndef CONFIG_SMP
 379 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 380 #else
 381
 382 static struct acpi_table_madt *madt;
 383
 384 static int map_lapic_id(struct acpi_subtable_header *entry,
 385                  u32 acpi_id, int *apic_id)
 386 {
 387         struct acpi_madt_local_apic *lapic =
 388                 (struct acpi_madt_local_apic *)entry;
 389         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 390             lapic->processor_id == acpi_id) {
 391                 *apic_id = lapic->id;
 392                 return 1;
 393         }
 394         return 0;
 395 }
 396
 397 static int map_lsapic_id(struct acpi_subtable_header *entry,
 398                   u32 acpi_id, int *apic_id)
 399 {
 400         struct acpi_madt_local_sapic *lsapic =
 401                 (struct acpi_madt_local_sapic *)entry;
 402         /* Only check enabled APICs*/
 403         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 404                 /* First check against id */
 405                 if (lsapic->processor_id == acpi_id) {
 406                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 407                         return 1;
 408                 /* Check against optional uid */
 409                 } else if (entry->length >= 16 &&
 410                         lsapic->uid == acpi_id) {
 411                         *apic_id = lsapic->uid;
 412                         return 1;
 413                 }
 414         }
 415         return 0;
 416 }
 417
 418 #ifdef CONFIG_IA64
 419 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 420 #else
 421 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 422 #endif
 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 (arch_cpu_to_apicid[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_event(device, event,
 698                                         pr->performance_platform_limit);
 699                 break;
 700         case ACPI_PROCESSOR_NOTIFY_POWER:
 701                 acpi_processor_cst_has_changed(pr);
 702                 acpi_bus_generate_event(device, event, 0);
 703                 break;
 704         default:
 705                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 706                                   "Unsupported event [0x%x]\n", event));
 707                 break;
 708         }
 709
 710         return;
 711 }
 712
 713 static int acpi_processor_add(struct acpi_device *device)
 714 {
 715         struct acpi_processor *pr = NULL;
 716
 717
 718         if (!device)
 719                 return -EINVAL;
 720
 721         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 722         if (!pr)
 723                 return -ENOMEM;
 724
 725         pr->handle = device->handle;
 726         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 727         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 728         acpi_driver_data(device) = pr;
 729
 730         return 0;
 731 }
 732
 733 static int acpi_processor_remove(struct acpi_device *device, int type)
 734 {
 735         acpi_status status = AE_OK;
 736         struct acpi_processor *pr = NULL;
 737
 738
 739         if (!device || !acpi_driver_data(device))
 740                 return -EINVAL;
 741
 742         pr = acpi_driver_data(device);
 743
 744         if (pr->id >= NR_CPUS) {
 745                 kfree(pr);
 746                 return 0;
 747         }
 748
 749         if (type == ACPI_BUS_REMOVAL_EJECT) {
 750                 if (acpi_processor_handle_eject(pr))
 751                         return -EINVAL;
 752         }
 753
 754         acpi_processor_power_exit(pr, device);
 755
 756         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 757                                             acpi_processor_notify);
 758
 759         acpi_processor_remove_fs(device);
 760
 761         processors[pr->id] = NULL;
 762
 763         kfree(pr);
 764
 765         return 0;
 766 }
 767
 768 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 769 /****************************************************************************
 770  *      Acpi processor hotplug support                                      *
 771  ****************************************************************************/
 772
 773 static int is_processor_present(acpi_handle handle);
 774
 775 static int is_processor_present(acpi_handle handle)
 776 {
 777         acpi_status status;
 778         unsigned long sta = 0;
 779
 780
 781         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 782         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
 783                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 784                 return 0;
 785         }
 786         return 1;
 787 }
 788
 789 static
 790 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 791 {
 792         acpi_handle phandle;
 793         struct acpi_device *pdev;
 794         struct acpi_processor *pr;
 795
 796
 797         if (acpi_get_parent(handle, &phandle)) {
 798                 return -ENODEV;
 799         }
 800
 801         if (acpi_bus_get_device(phandle, &pdev)) {
 802                 return -ENODEV;
 803         }
 804
 805         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 806                 return -ENODEV;
 807         }
 808
 809         acpi_bus_start(*device);
 810
 811         pr = acpi_driver_data(*device);
 812         if (!pr)
 813                 return -ENODEV;
 814
 815         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 816                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 817         }
 818         return 0;
 819 }
 820
 821 static void
 822 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 823 {
 824         struct acpi_processor *pr;
 825         struct acpi_device *device = NULL;
 826         int result;
 827
 828
 829         switch (event) {
 830         case ACPI_NOTIFY_BUS_CHECK:
 831         case ACPI_NOTIFY_DEVICE_CHECK:
 832                 printk("Processor driver received %s event\n",
 833                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 834                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 835
 836                 if (!is_processor_present(handle))
 837                         break;
 838
 839                 if (acpi_bus_get_device(handle, &device)) {
 840                         result = acpi_processor_device_add(handle, &device);
 841                         if (result)
 842                                 printk(KERN_ERR PREFIX
 843                                             "Unable to add the device\n");
 844                         break;
 845                 }
 846
 847                 pr = acpi_driver_data(device);
 848                 if (!pr) {
 849                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 850                         break;
 851                 }
 852
 853                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 854                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 855                         break;
 856                 }
 857
 858                 result = acpi_processor_start(device);
 859                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 860                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 861                 } else {
 862                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 863                                     acpi_device_bid(device));
 864                 }
 865                 break;
 866         case ACPI_NOTIFY_EJECT_REQUEST:
 867                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 868                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 869
 870                 if (acpi_bus_get_device(handle, &device)) {
 871                         printk(KERN_ERR PREFIX
 872                                     "Device don't exist, dropping EJECT\n");
 873                         break;
 874                 }
 875                 pr = acpi_driver_data(device);
 876                 if (!pr) {
 877                         printk(KERN_ERR PREFIX
 878                                     "Driver data is NULL, dropping EJECT\n");
 879                         return;
 880                 }
 881
 882                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 883                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 884                 break;
 885         default:
 886                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 887                                   "Unsupported event [0x%x]\n", event));
 888                 break;
 889         }
 890
 891         return;
 892 }
 893
 894 static acpi_status
 895 processor_walk_namespace_cb(acpi_handle handle,
 896                             u32 lvl, void *context, void **rv)
 897 {
 898         acpi_status status;
 899         int *action = context;
 900         acpi_object_type type = 0;
 901
 902         status = acpi_get_type(handle, &type);
 903         if (ACPI_FAILURE(status))
 904                 return (AE_OK);
 905
 906         if (type != ACPI_TYPE_PROCESSOR)
 907                 return (AE_OK);
 908
 909         switch (*action) {
 910         case INSTALL_NOTIFY_HANDLER:
 911                 acpi_install_notify_handler(handle,
 912                                             ACPI_SYSTEM_NOTIFY,
 913                                             acpi_processor_hotplug_notify,
 914                                             NULL);
 915                 break;
 916         case UNINSTALL_NOTIFY_HANDLER:
 917                 acpi_remove_notify_handler(handle,
 918                                            ACPI_SYSTEM_NOTIFY,
 919                                            acpi_processor_hotplug_notify);
 920                 break;
 921         default:
 922                 break;
 923         }
 924
 925         return (AE_OK);
 926 }
 927
 928 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 929 {
 930
 931         if (!is_processor_present(handle)) {
 932                 return AE_ERROR;
 933         }
 934
 935         if (acpi_map_lsapic(handle, p_cpu))
 936                 return AE_ERROR;
 937
 938         if (arch_register_cpu(*p_cpu)) {
 939                 acpi_unmap_lsapic(*p_cpu);
 940                 return AE_ERROR;
 941         }
 942
 943         return AE_OK;
 944 }
 945
 946 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 947 {
 948         if (cpu_online(pr->id)) {
 949                 return (-EINVAL);
 950         }
 951         arch_unregister_cpu(pr->id);
 952         acpi_unmap_lsapic(pr->id);
 953         return (0);
 954 }
 955 #else
 956 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 957 {
 958         return AE_ERROR;
 959 }
 960 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 961 {
 962         return (-EINVAL);
 963 }
 964 #endif
 965
 966 static
 967 void acpi_processor_install_hotplug_notify(void)
 968 {
 969 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 970         int action = INSTALL_NOTIFY_HANDLER;
 971         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 972                             ACPI_ROOT_OBJECT,
 973                             ACPI_UINT32_MAX,
 974                             processor_walk_namespace_cb, &action, NULL);
 975 #endif
 976 }
 977
 978 static
 979 void acpi_processor_uninstall_hotplug_notify(void)
 980 {
 981 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 982         int action = UNINSTALL_NOTIFY_HANDLER;
 983         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 984                             ACPI_ROOT_OBJECT,
 985                             ACPI_UINT32_MAX,
 986                             processor_walk_namespace_cb, &action, NULL);
 987 #endif
 988 }
 989
 990 /*
 991  * We keep the driver loaded even when ACPI is not running.
 992  * This is needed for the powernow-k8 driver, that works even without
 993  * ACPI, but needs symbols from this driver
 994  */
 995
 996 static int __init acpi_processor_init(void)
 997 {
 998         int result = 0;
 999
1000
1001         memset(&processors, 0, sizeof(processors));
1002         memset(&errata, 0, sizeof(errata));
1003
1004 #ifdef CONFIG_SMP
1005         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1006                                 (struct acpi_table_header **)&madt)))
1007                 madt = NULL;
1008 #endif
1009
1010         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1011         if (!acpi_processor_dir)
1012                 return -ENOMEM;
1013         acpi_processor_dir->owner = THIS_MODULE;
1014
1015         result = acpi_bus_register_driver(&acpi_processor_driver);
1016         if (result < 0) {
1017                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1018                 return result;
1019         }
1020
1021         acpi_processor_install_hotplug_notify();
1022
1023         acpi_thermal_cpufreq_init();
1024
1025         acpi_processor_ppc_init();
1026
1027         return 0;
1028 }
1029
1030 static void __exit acpi_processor_exit(void)
1031 {
1032
1033         acpi_processor_ppc_exit();
1034
1035         acpi_thermal_cpufreq_exit();
1036
1037         acpi_processor_uninstall_hotplug_notify();
1038
1039         acpi_bus_unregister_driver(&acpi_processor_driver);
1040
1041         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1042
1043         return;
1044 }
1045
1046 module_init(acpi_processor_init);
1047 module_exit(acpi_processor_exit);
1048
1049 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1050
1051 MODULE_ALIAS("processor");