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 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define PREFIX "ACPI: "
  63
  64 #define ACPI_PROCESSOR_CLASS            "processor"
  65 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  66 #define ACPI_PROCESSOR_FILE_INFO        "info"
  67 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  68 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  70 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  72
  73 #define ACPI_PROCESSOR_LIMIT_USER       0
  74 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  75
  76 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  77 ACPI_MODULE_NAME("processor_core");
  78
  79 MODULE_AUTHOR("Paul Diefenbaugh");
  80 MODULE_DESCRIPTION("ACPI Processor Driver");
  81 MODULE_LICENSE("GPL");
  82
  83 static int acpi_processor_add(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 #ifdef CONFIG_ACPI_PROCFS
  86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  87 #endif
  88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  91
  92
  93 static const struct acpi_device_id processor_device_ids[] = {
  94         {ACPI_PROCESSOR_OBJECT_HID, 0},
  95         {"ACPI0007", 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  99
 100 static struct acpi_driver acpi_processor_driver = {
 101         .name = "processor",
 102         .class = ACPI_PROCESSOR_CLASS,
 103         .ids = processor_device_ids,
 104         .ops = {
 105                 .add = acpi_processor_add,
 106                 .remove = acpi_processor_remove,
 107                 .suspend = acpi_processor_suspend,
 108                 .resume = acpi_processor_resume,
 109                 .notify = acpi_processor_notify,
 110                 },
 111 };
 112
 113 #define INSTALL_NOTIFY_HANDLER          1
 114 #define UNINSTALL_NOTIFY_HANDLER        2
 115 #ifdef CONFIG_ACPI_PROCFS
 116 static const struct file_operations acpi_processor_info_fops = {
 117         .owner = THIS_MODULE,
 118         .open = acpi_processor_info_open_fs,
 119         .read = seq_read,
 120         .llseek = seq_lseek,
 121         .release = single_release,
 122 };
 123 #endif
 124
 125 DEFINE_PER_CPU(struct acpi_processor *, processors);
 126 struct acpi_processor_errata errata __read_mostly;
 127
 128 /* --------------------------------------------------------------------------
 129                                 Errata Handling
 130    -------------------------------------------------------------------------- */
 131
 132 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 133 {
 134         u8 value1 = 0;
 135         u8 value2 = 0;
 136
 137
 138         if (!dev)
 139                 return -EINVAL;
 140
 141         /*
 142          * Note that 'dev' references the PIIX4 ACPI Controller.
 143          */
 144
 145         switch (dev->revision) {
 146         case 0:
 147                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 148                 break;
 149         case 1:
 150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 151                 break;
 152         case 2:
 153                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 154                 break;
 155         case 3:
 156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 157                 break;
 158         default:
 159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 160                 break;
 161         }
 162
 163         switch (dev->revision) {
 164
 165         case 0:         /* PIIX4 A-step */
 166         case 1:         /* PIIX4 B-step */
 167                 /*
 168                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 169                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 170                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 171                  * 2002 PIIX4 specification update.  Applies to only older
 172                  * PIIX4 models.
 173                  */
 174                 errata.piix4.throttle = 1;
 175
 176         case 2:         /* PIIX4E */
 177         case 3:         /* PIIX4M */
 178                 /*
 179                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 180                  * Livelock") from the January 2002 PIIX4 specification update.
 181                  * Applies to all PIIX4 models.
 182                  */
 183
 184                 /*
 185                  * BM-IDE
 186                  * ------
 187                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 188                  * Status register address.  We'll use this later to read
 189                  * each IDE controller's DMA status to make sure we catch all
 190                  * DMA activity.
 191                  */
 192                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 193                                      PCI_DEVICE_ID_INTEL_82371AB,
 194                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 195                 if (dev) {
 196                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 197                         pci_dev_put(dev);
 198                 }
 199
 200                 /*
 201                  * Type-F DMA
 202                  * ----------
 203                  * Find the PIIX4 ISA Controller and read the Motherboard
 204                  * DMA controller's status to see if Type-F (Fast) DMA mode
 205                  * is enabled (bit 7) on either channel.  Note that we'll
 206                  * disable C3 support if this is enabled, as some legacy
 207                  * devices won't operate well if fast DMA is disabled.
 208                  */
 209                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 210                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 211                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 212                 if (dev) {
 213                         pci_read_config_byte(dev, 0x76, &value1);
 214                         pci_read_config_byte(dev, 0x77, &value2);
 215                         if ((value1 & 0x80) || (value2 & 0x80))
 216                                 errata.piix4.fdma = 1;
 217                         pci_dev_put(dev);
 218                 }
 219
 220                 break;
 221         }
 222
 223         if (errata.piix4.bmisx)
 224                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 225                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 226         if (errata.piix4.fdma)
 227                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 228                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 229
 230         return 0;
 231 }
 232
 233 static int acpi_processor_errata(struct acpi_processor *pr)
 234 {
 235         int result = 0;
 236         struct pci_dev *dev = NULL;
 237
 238
 239         if (!pr)
 240                 return -EINVAL;
 241
 242         /*
 243          * PIIX4
 244          */
 245         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 246                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 247                              PCI_ANY_ID, NULL);
 248         if (dev) {
 249                 result = acpi_processor_errata_piix4(dev);
 250                 pci_dev_put(dev);
 251         }
 252
 253         return result;
 254 }
 255
 256 /* --------------------------------------------------------------------------
 257                               FS Interface (/proc)
 258    -------------------------------------------------------------------------- */
 259
 260 #ifdef CONFIG_ACPI_PROCFS
 261 static struct proc_dir_entry *acpi_processor_dir = NULL;
 262
 263 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 264 {
 265         struct acpi_processor *pr = seq->private;
 266
 267
 268         if (!pr)
 269                 goto end;
 270
 271         seq_printf(seq, "processor id:            %d\n"
 272                    "acpi id:                 %d\n"
 273                    "bus mastering control:   %s\n"
 274                    "power management:        %s\n"
 275                    "throttling control:      %s\n"
 276                    "limit interface:         %s\n",
 277                    pr->id,
 278                    pr->acpi_id,
 279                    pr->flags.bm_control ? "yes" : "no",
 280                    pr->flags.power ? "yes" : "no",
 281                    pr->flags.throttling ? "yes" : "no",
 282                    pr->flags.limit ? "yes" : "no");
 283
 284       end:
 285         return 0;
 286 }
 287
 288 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 289 {
 290         return single_open(file, acpi_processor_info_seq_show,
 291                            PDE(inode)->data);
 292 }
 293
 294 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 295 {
 296         struct proc_dir_entry *entry = NULL;
 297
 298
 299         if (!acpi_device_dir(device)) {
 300                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 301                                                      acpi_processor_dir);
 302                 if (!acpi_device_dir(device))
 303                         return -ENODEV;
 304         }
 305
 306         /* 'info' [R] */
 307         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 308                                  S_IRUGO, acpi_device_dir(device),
 309                                  &acpi_processor_info_fops,
 310                                  acpi_driver_data(device));
 311         if (!entry)
 312                 return -EIO;
 313
 314         /* 'throttling' [R/W] */
 315         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 316                                  S_IFREG | S_IRUGO | S_IWUSR,
 317                                  acpi_device_dir(device),
 318                                  &acpi_processor_throttling_fops,
 319                                  acpi_driver_data(device));
 320         if (!entry)
 321                 return -EIO;
 322
 323         /* 'limit' [R/W] */
 324         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 325                                  S_IFREG | S_IRUGO | S_IWUSR,
 326                                  acpi_device_dir(device),
 327                                  &acpi_processor_limit_fops,
 328                                  acpi_driver_data(device));
 329         if (!entry)
 330                 return -EIO;
 331         return 0;
 332 }
 333 static int acpi_processor_remove_fs(struct acpi_device *device)
 334 {
 335
 336         if (acpi_device_dir(device)) {
 337                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 338                                   acpi_device_dir(device));
 339                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 340                                   acpi_device_dir(device));
 341                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 342                                   acpi_device_dir(device));
 343                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 344                 acpi_device_dir(device) = NULL;
 345         }
 346
 347         return 0;
 348 }
 349 #else
 350 static inline int acpi_processor_add_fs(struct acpi_device *device)
 351 {
 352         return 0;
 353 }
 354 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 355 {
 356         return 0;
 357 }
 358 #endif
 359
 360 /* Use the acpiid in MADT to map cpus in case of SMP */
 361
 362 #ifndef CONFIG_SMP
 363 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 364 #else
 365
 366 static struct acpi_table_madt *madt;
 367
 368 static int map_lapic_id(struct acpi_subtable_header *entry,
 369                  u32 acpi_id, int *apic_id)
 370 {
 371         struct acpi_madt_local_apic *lapic =
 372                 (struct acpi_madt_local_apic *)entry;
 373         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 374             lapic->processor_id == acpi_id) {
 375                 *apic_id = lapic->id;
 376                 return 1;
 377         }
 378         return 0;
 379 }
 380
 381 static int map_x2apic_id(struct acpi_subtable_header *entry,
 382                          int device_declaration, u32 acpi_id, int *apic_id)
 383 {
 384         struct acpi_madt_local_x2apic *apic =
 385                 (struct acpi_madt_local_x2apic *)entry;
 386         u32 tmp = apic->local_apic_id;
 387
 388         /* Only check enabled APICs*/
 389         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 390                 return 0;
 391
 392         /* Device statement declaration type */
 393         if (device_declaration) {
 394                 if (apic->uid == acpi_id)
 395                         goto found;
 396         }
 397
 398         return 0;
 399 found:
 400         *apic_id = tmp;
 401         return 1;
 402 }
 403
 404 static int map_lsapic_id(struct acpi_subtable_header *entry,
 405                 int device_declaration, u32 acpi_id, int *apic_id)
 406 {
 407         struct acpi_madt_local_sapic *lsapic =
 408                 (struct acpi_madt_local_sapic *)entry;
 409         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 410
 411         /* Only check enabled APICs*/
 412         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 413                 return 0;
 414
 415         /* Device statement declaration type */
 416         if (device_declaration) {
 417                 if (entry->length < 16)
 418                         printk(KERN_ERR PREFIX
 419                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 420                             tmp);
 421                 else if (lsapic->uid == acpi_id)
 422                         goto found;
 423         /* Processor statement declaration type */
 424         } else if (lsapic->processor_id == acpi_id)
 425                 goto found;
 426
 427         return 0;
 428 found:
 429         *apic_id = tmp;
 430         return 1;
 431 }
 432
 433 static int map_madt_entry(int type, u32 acpi_id)
 434 {
 435         unsigned long madt_end, entry;
 436         int apic_id = -1;
 437
 438         if (!madt)
 439                 return apic_id;
 440
 441         entry = (unsigned long)madt;
 442         madt_end = entry + madt->header.length;
 443
 444         /* Parse all entries looking for a match. */
 445
 446         entry += sizeof(struct acpi_table_madt);
 447         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 448                 struct acpi_subtable_header *header =
 449                         (struct acpi_subtable_header *)entry;
 450                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 451                         if (map_lapic_id(header, acpi_id, &apic_id))
 452                                 break;
 453                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 454                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 455                                 break;
 456                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 457                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 458                                 break;
 459                 }
 460                 entry += header->length;
 461         }
 462         return apic_id;
 463 }
 464
 465 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 466 {
 467         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 468         union acpi_object *obj;
 469         struct acpi_subtable_header *header;
 470         int apic_id = -1;
 471
 472         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 473                 goto exit;
 474
 475         if (!buffer.length || !buffer.pointer)
 476                 goto exit;
 477
 478         obj = buffer.pointer;
 479         if (obj->type != ACPI_TYPE_BUFFER ||
 480             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 481                 goto exit;
 482         }
 483
 484         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 485         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 486                 map_lapic_id(header, acpi_id, &apic_id);
 487         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 488                 map_lsapic_id(header, type, acpi_id, &apic_id);
 489         }
 490
 491 exit:
 492         if (buffer.pointer)
 493                 kfree(buffer.pointer);
 494         return apic_id;
 495 }
 496
 497 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 498 {
 499         int i;
 500         int apic_id = -1;
 501
 502         apic_id = map_mat_entry(handle, type, acpi_id);
 503         if (apic_id == -1)
 504                 apic_id = map_madt_entry(type, acpi_id);
 505         if (apic_id == -1)
 506                 return apic_id;
 507
 508         for_each_possible_cpu(i) {
 509                 if (cpu_physical_id(i) == apic_id)
 510                         return i;
 511         }
 512         return -1;
 513 }
 514 #endif
 515
 516 /* --------------------------------------------------------------------------
 517                                  Driver Interface
 518    -------------------------------------------------------------------------- */
 519
 520 static int acpi_processor_get_info(struct acpi_device *device)
 521 {
 522         acpi_status status = 0;
 523         union acpi_object object = { 0 };
 524         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 525         struct acpi_processor *pr;
 526         int cpu_index, device_declaration = 0;
 527         static int cpu0_initialized;
 528
 529         pr = acpi_driver_data(device);
 530         if (!pr)
 531                 return -EINVAL;
 532
 533         if (num_online_cpus() > 1)
 534                 errata.smp = TRUE;
 535
 536         acpi_processor_errata(pr);
 537
 538         /*
 539          * Check to see if we have bus mastering arbitration control.  This
 540          * is required for proper C3 usage (to maintain cache coherency).
 541          */
 542         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 543                 pr->flags.bm_control = 1;
 544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 545                                   "Bus mastering arbitration control present\n"));
 546         } else
 547                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 548                                   "No bus mastering arbitration control\n"));
 549
 550         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 551                 /* Declared with "Processor" statement; match ProcessorID */
 552                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 553                 if (ACPI_FAILURE(status)) {
 554                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 555                         return -ENODEV;
 556                 }
 557
 558                 /*
 559                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 560                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 561                  *      arch/xxx/acpi.c
 562                  */
 563                 pr->acpi_id = object.processor.proc_id;
 564         } else {
 565                 /*
 566                  * Declared with "Device" statement; match _UID.
 567                  * Note that we don't handle string _UIDs yet.
 568                  */
 569                 unsigned long long value;
 570                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 571                                                 NULL, &value);
 572                 if (ACPI_FAILURE(status)) {
 573                         printk(KERN_ERR PREFIX
 574                             "Evaluating processor _UID [%#x]\n", status);
 575                         return -ENODEV;
 576                 }
 577                 device_declaration = 1;
 578                 pr->acpi_id = value;
 579         }
 580         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 581
 582         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 583         if (!cpu0_initialized && (cpu_index == -1) &&
 584             (num_online_cpus() == 1)) {
 585                 cpu_index = 0;
 586         }
 587
 588         cpu0_initialized = 1;
 589
 590         pr->id = cpu_index;
 591
 592         /*
 593          *  Extra Processor objects may be enumerated on MP systems with
 594          *  less than the max # of CPUs. They should be ignored _iff
 595          *  they are physically not present.
 596          */
 597         if (pr->id == -1) {
 598                 if (ACPI_FAILURE
 599                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 600                         return -ENODEV;
 601                 }
 602         }
 603         /*
 604          * On some boxes several processors use the same processor bus id.
 605          * But they are located in different scope. For example:
 606          * \_SB.SCK0.CPU0
 607          * \_SB.SCK1.CPU0
 608          * Rename the processor device bus id. And the new bus id will be
 609          * generated as the following format:
 610          * CPU+CPU ID.
 611          */
 612         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 613         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 614                           pr->acpi_id));
 615
 616         if (!object.processor.pblk_address)
 617                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 618         else if (object.processor.pblk_length != 6)
 619                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 620                             object.processor.pblk_length);
 621         else {
 622                 pr->throttling.address = object.processor.pblk_address;
 623                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 624                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 625
 626                 pr->pblk = object.processor.pblk_address;
 627
 628                 /*
 629                  * We don't care about error returns - we just try to mark
 630                  * these reserved so that nobody else is confused into thinking
 631                  * that this region might be unused..
 632                  *
 633                  * (In particular, allocating the IO range for Cardbus)
 634                  */
 635                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 636         }
 637
 638         /*
 639          * If ACPI describes a slot number for this CPU, we can use it
 640          * ensure we get the right value in the "physical id" field
 641          * of /proc/cpuinfo
 642          */
 643         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 644         if (ACPI_SUCCESS(status))
 645                 arch_fix_phys_package_id(pr->id, object.integer.value);
 646
 647         return 0;
 648 }
 649
 650 static DEFINE_PER_CPU(void *, processor_device_array);
 651
 652 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 653 {
 654         struct acpi_processor *pr = acpi_driver_data(device);
 655         int saved;
 656
 657         if (!pr)
 658                 return;
 659
 660         switch (event) {
 661         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 662                 saved = pr->performance_platform_limit;
 663                 acpi_processor_ppc_has_changed(pr, 1);
 664                 if (saved == pr->performance_platform_limit)
 665                         break;
 666                 acpi_bus_generate_proc_event(device, event,
 667                                         pr->performance_platform_limit);
 668                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 669                                                   dev_name(&device->dev), event,
 670                                                   pr->performance_platform_limit);
 671                 break;
 672         case ACPI_PROCESSOR_NOTIFY_POWER:
 673                 acpi_processor_cst_has_changed(pr);
 674                 acpi_bus_generate_proc_event(device, event, 0);
 675                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 676                                                   dev_name(&device->dev), event, 0);
 677                 break;
 678         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 679                 acpi_processor_tstate_has_changed(pr);
 680                 acpi_bus_generate_proc_event(device, event, 0);
 681                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 682                                                   dev_name(&device->dev), event, 0);
 683         default:
 684                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 685                                   "Unsupported event [0x%x]\n", event));
 686                 break;
 687         }
 688
 689         return;
 690 }
 691
 692 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 693                 unsigned long action, void *hcpu)
 694 {
 695         unsigned int cpu = (unsigned long)hcpu;
 696         struct acpi_processor *pr = per_cpu(processors, cpu);
 697
 698         if (action == CPU_ONLINE && pr) {
 699                 acpi_processor_ppc_has_changed(pr, 0);
 700                 acpi_processor_cst_has_changed(pr);
 701                 acpi_processor_tstate_has_changed(pr);
 702         }
 703         return NOTIFY_OK;
 704 }
 705
 706 static struct notifier_block acpi_cpu_notifier =
 707 {
 708             .notifier_call = acpi_cpu_soft_notify,
 709 };
 710
 711 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 712 {
 713         struct acpi_processor *pr = NULL;
 714         int result = 0;
 715         struct sys_device *sysdev;
 716
 717         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 718         if (!pr)
 719                 return -ENOMEM;
 720
 721         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 722                 kfree(pr);
 723                 return -ENOMEM;
 724         }
 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         device->driver_data = pr;
 730
 731         result = acpi_processor_get_info(device);
 732         if (result) {
 733                 /* Processor is physically not present */
 734                 return 0;
 735         }
 736
 737         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 738
 739         /*
 740          * Buggy BIOS check
 741          * ACPI id of processors can be reported wrongly by the BIOS.
 742          * Don't trust it blindly
 743          */
 744         if (per_cpu(processor_device_array, pr->id) != NULL &&
 745             per_cpu(processor_device_array, pr->id) != device) {
 746                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 747                         "for the processor\n");
 748                 result = -ENODEV;
 749                 goto err_free_cpumask;
 750         }
 751         per_cpu(processor_device_array, pr->id) = device;
 752
 753         per_cpu(processors, pr->id) = pr;
 754
 755         result = acpi_processor_add_fs(device);
 756         if (result)
 757                 goto err_free_cpumask;
 758
 759         sysdev = get_cpu_sysdev(pr->id);
 760         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 761                 result = -EFAULT;
 762                 goto err_remove_fs;
 763         }
 764
 765         /* _PDC call should be done before doing anything else (if reqd.). */
 766         acpi_processor_set_pdc(pr->handle);
 767
 768 #ifdef CONFIG_CPU_FREQ
 769         acpi_processor_ppc_has_changed(pr, 0);
 770 #endif
 771         acpi_processor_get_throttling_info(pr);
 772         acpi_processor_get_limit_info(pr);
 773
 774
 775         acpi_processor_power_init(pr, device);
 776
 777         pr->cdev = thermal_cooling_device_register("Processor", device,
 778                                                 &processor_cooling_ops);
 779         if (IS_ERR(pr->cdev)) {
 780                 result = PTR_ERR(pr->cdev);
 781                 goto err_power_exit;
 782         }
 783
 784         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 785                  pr->cdev->id);
 786
 787         result = sysfs_create_link(&device->dev.kobj,
 788                                    &pr->cdev->device.kobj,
 789                                    "thermal_cooling");
 790         if (result) {
 791                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 792                 goto err_thermal_unregister;
 793         }
 794         result = sysfs_create_link(&pr->cdev->device.kobj,
 795                                    &device->dev.kobj,
 796                                    "device");
 797         if (result) {
 798                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 799                 goto err_remove_sysfs;
 800         }
 801
 802         return 0;
 803
 804 err_remove_sysfs:
 805         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 806 err_thermal_unregister:
 807         thermal_cooling_device_unregister(pr->cdev);
 808 err_power_exit:
 809         acpi_processor_power_exit(pr, device);
 810 err_remove_fs:
 811         acpi_processor_remove_fs(device);
 812 err_free_cpumask:
 813         free_cpumask_var(pr->throttling.shared_cpu_map);
 814
 815         return result;
 816 }
 817
 818 static int acpi_processor_remove(struct acpi_device *device, int type)
 819 {
 820         struct acpi_processor *pr = NULL;
 821
 822
 823         if (!device || !acpi_driver_data(device))
 824                 return -EINVAL;
 825
 826         pr = acpi_driver_data(device);
 827
 828         if (pr->id >= nr_cpu_ids)
 829                 goto free;
 830
 831         if (type == ACPI_BUS_REMOVAL_EJECT) {
 832                 if (acpi_processor_handle_eject(pr))
 833                         return -EINVAL;
 834         }
 835
 836         acpi_processor_power_exit(pr, device);
 837
 838         sysfs_remove_link(&device->dev.kobj, "sysdev");
 839
 840         acpi_processor_remove_fs(device);
 841
 842         if (pr->cdev) {
 843                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 844                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 845                 thermal_cooling_device_unregister(pr->cdev);
 846                 pr->cdev = NULL;
 847         }
 848
 849         per_cpu(processors, pr->id) = NULL;
 850         per_cpu(processor_device_array, pr->id) = NULL;
 851
 852 free:
 853         free_cpumask_var(pr->throttling.shared_cpu_map);
 854         kfree(pr);
 855
 856         return 0;
 857 }
 858
 859 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 860 /****************************************************************************
 861  *      Acpi processor hotplug support                                      *
 862  ****************************************************************************/
 863
 864 static int is_processor_present(acpi_handle handle)
 865 {
 866         acpi_status status;
 867         unsigned long long sta = 0;
 868
 869
 870         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 871
 872         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 873                 return 1;
 874
 875         /*
 876          * _STA is mandatory for a processor that supports hot plug
 877          */
 878         if (status == AE_NOT_FOUND)
 879                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 880                                 "Processor does not support hot plug\n"));
 881         else
 882                 ACPI_EXCEPTION((AE_INFO, status,
 883                                 "Processor Device is not present"));
 884         return 0;
 885 }
 886
 887 static
 888 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 889 {
 890         acpi_handle phandle;
 891         struct acpi_device *pdev;
 892
 893
 894         if (acpi_get_parent(handle, &phandle)) {
 895                 return -ENODEV;
 896         }
 897
 898         if (acpi_bus_get_device(phandle, &pdev)) {
 899                 return -ENODEV;
 900         }
 901
 902         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 903                 return -ENODEV;
 904         }
 905
 906         return 0;
 907 }
 908
 909 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 910                                                 u32 event, void *data)
 911 {
 912         struct acpi_processor *pr;
 913         struct acpi_device *device = NULL;
 914         int result;
 915
 916
 917         switch (event) {
 918         case ACPI_NOTIFY_BUS_CHECK:
 919         case ACPI_NOTIFY_DEVICE_CHECK:
 920                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 921                 "Processor driver received %s event\n",
 922                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 923                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 924
 925                 if (!is_processor_present(handle))
 926                         break;
 927
 928                 if (acpi_bus_get_device(handle, &device)) {
 929                         result = acpi_processor_device_add(handle, &device);
 930                         if (result)
 931                                 printk(KERN_ERR PREFIX
 932                                             "Unable to add the device\n");
 933                         break;
 934                 }
 935                 break;
 936         case ACPI_NOTIFY_EJECT_REQUEST:
 937                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 938                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 939
 940                 if (acpi_bus_get_device(handle, &device)) {
 941                         printk(KERN_ERR PREFIX
 942                                     "Device don't exist, dropping EJECT\n");
 943                         break;
 944                 }
 945                 pr = acpi_driver_data(device);
 946                 if (!pr) {
 947                         printk(KERN_ERR PREFIX
 948                                     "Driver data is NULL, dropping EJECT\n");
 949                         return;
 950                 }
 951                 break;
 952         default:
 953                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 954                                   "Unsupported event [0x%x]\n", event));
 955                 break;
 956         }
 957
 958         return;
 959 }
 960
 961 static acpi_status
 962 processor_walk_namespace_cb(acpi_handle handle,
 963                             u32 lvl, void *context, void **rv)
 964 {
 965         acpi_status status;
 966         int *action = context;
 967         acpi_object_type type = 0;
 968
 969         status = acpi_get_type(handle, &type);
 970         if (ACPI_FAILURE(status))
 971                 return (AE_OK);
 972
 973         if (type != ACPI_TYPE_PROCESSOR)
 974                 return (AE_OK);
 975
 976         switch (*action) {
 977         case INSTALL_NOTIFY_HANDLER:
 978                 acpi_install_notify_handler(handle,
 979                                             ACPI_SYSTEM_NOTIFY,
 980                                             acpi_processor_hotplug_notify,
 981                                             NULL);
 982                 break;
 983         case UNINSTALL_NOTIFY_HANDLER:
 984                 acpi_remove_notify_handler(handle,
 985                                            ACPI_SYSTEM_NOTIFY,
 986                                            acpi_processor_hotplug_notify);
 987                 break;
 988         default:
 989                 break;
 990         }
 991
 992         return (AE_OK);
 993 }
 994
 995 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 996 {
 997
 998         if (!is_processor_present(handle)) {
 999                 return AE_ERROR;
1000         }
1001
1002         if (acpi_map_lsapic(handle, p_cpu))
1003                 return AE_ERROR;
1004
1005         if (arch_register_cpu(*p_cpu)) {
1006                 acpi_unmap_lsapic(*p_cpu);
1007                 return AE_ERROR;
1008         }
1009
1010         return AE_OK;
1011 }
1012
1013 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1014 {
1015         if (cpu_online(pr->id))
1016                 cpu_down(pr->id);
1017
1018         arch_unregister_cpu(pr->id);
1019         acpi_unmap_lsapic(pr->id);
1020         return (0);
1021 }
1022 #else
1023 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1024 {
1025         return AE_ERROR;
1026 }
1027 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1028 {
1029         return (-EINVAL);
1030 }
1031 #endif
1032
1033 static
1034 void acpi_processor_install_hotplug_notify(void)
1035 {
1036 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1037         int action = INSTALL_NOTIFY_HANDLER;
1038         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1039                             ACPI_ROOT_OBJECT,
1040                             ACPI_UINT32_MAX,
1041                             processor_walk_namespace_cb, NULL, &action, NULL);
1042 #endif
1043         register_hotcpu_notifier(&acpi_cpu_notifier);
1044 }
1045
1046 static
1047 void acpi_processor_uninstall_hotplug_notify(void)
1048 {
1049 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1050         int action = UNINSTALL_NOTIFY_HANDLER;
1051         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1052                             ACPI_ROOT_OBJECT,
1053                             ACPI_UINT32_MAX,
1054                             processor_walk_namespace_cb, NULL, &action, NULL);
1055 #endif
1056         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1057 }
1058
1059 /*
1060  * We keep the driver loaded even when ACPI is not running.
1061  * This is needed for the powernow-k8 driver, that works even without
1062  * ACPI, but needs symbols from this driver
1063  */
1064
1065 static int __init acpi_processor_init(void)
1066 {
1067         int result = 0;
1068
1069         if (acpi_disabled)
1070                 return 0;
1071
1072         memset(&errata, 0, sizeof(errata));
1073
1074 #ifdef CONFIG_SMP
1075         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1076                                 (struct acpi_table_header **)&madt)))
1077                 madt = NULL;
1078 #endif
1079 #ifdef CONFIG_ACPI_PROCFS
1080         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1081         if (!acpi_processor_dir)
1082                 return -ENOMEM;
1083 #endif
1084         result = cpuidle_register_driver(&acpi_idle_driver);
1085         if (result < 0)
1086                 goto out_proc;
1087
1088         result = acpi_bus_register_driver(&acpi_processor_driver);
1089         if (result < 0)
1090                 goto out_cpuidle;
1091
1092         acpi_processor_install_hotplug_notify();
1093
1094         acpi_thermal_cpufreq_init();
1095
1096         acpi_processor_ppc_init();
1097
1098         acpi_processor_throttling_init();
1099
1100         return 0;
1101
1102 out_cpuidle:
1103         cpuidle_unregister_driver(&acpi_idle_driver);
1104
1105 out_proc:
1106 #ifdef CONFIG_ACPI_PROCFS
1107         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1108 #endif
1109
1110         return result;
1111 }
1112
1113 static void __exit acpi_processor_exit(void)
1114 {
1115         if (acpi_disabled)
1116                 return;
1117
1118         acpi_processor_ppc_exit();
1119
1120         acpi_thermal_cpufreq_exit();
1121
1122         acpi_processor_uninstall_hotplug_notify();
1123
1124         acpi_bus_unregister_driver(&acpi_processor_driver);
1125
1126         cpuidle_unregister_driver(&acpi_idle_driver);
1127
1128 #ifdef CONFIG_ACPI_PROCFS
1129         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1130 #endif
1131
1132         return;
1133 }
1134
1135 module_init(acpi_processor_init);
1136 module_exit(acpi_processor_exit);
1137
1138 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1139
1140 MODULE_ALIAS("processor");