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   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/cpu.h>
  52 #include <asm/delay.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/processor.h>
  55 #include <asm/smp.h>
  56 #include <asm/acpi.h>
  57
  58 #include <acpi/acpi_bus.h>
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/processor.h>
  61
  62 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  63 #define ACPI_PROCESSOR_CLASS            "processor"
  64 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  65 #define ACPI_PROCESSOR_FILE_INFO        "info"
  66 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  67 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  69 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  70 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  71
  72 #define ACPI_PROCESSOR_LIMIT_USER       0
  73 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  74
  75 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  76 ACPI_MODULE_NAME("processor_core");
  77
  78 MODULE_AUTHOR("Paul Diefenbaugh");
  79 MODULE_DESCRIPTION("ACPI Processor Driver");
  80 MODULE_LICENSE("GPL");
  81
  82 static int acpi_processor_add(struct acpi_device *device);
  83 static int acpi_processor_start(struct acpi_device *device);
  84 static int acpi_processor_remove(struct acpi_device *device, int type);
  85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  88 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  89
  90
  91 static const struct acpi_device_id processor_device_ids[] = {
  92         {ACPI_PROCESSOR_HID, 0},
  93         {"", 0},
  94 };
  95 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  96
  97 static struct acpi_driver acpi_processor_driver = {
  98         .name = "processor",
  99         .class = ACPI_PROCESSOR_CLASS,
 100         .ids = processor_device_ids,
 101         .ops = {
 102                 .add = acpi_processor_add,
 103                 .remove = acpi_processor_remove,
 104                 .start = acpi_processor_start,
 105                 .suspend = acpi_processor_suspend,
 106                 .resume = acpi_processor_resume,
 107                 },
 108 };
 109
 110 #define INSTALL_NOTIFY_HANDLER          1
 111 #define UNINSTALL_NOTIFY_HANDLER        2
 112
 113 static const struct file_operations acpi_processor_info_fops = {
 114         .owner = THIS_MODULE,
 115         .open = acpi_processor_info_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 DEFINE_PER_CPU(struct acpi_processor *, processors);
 122 struct acpi_processor_errata errata __read_mostly;
 123
 124 /* --------------------------------------------------------------------------
 125                                 Errata Handling
 126    -------------------------------------------------------------------------- */
 127
 128 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 129 {
 130         u8 value1 = 0;
 131         u8 value2 = 0;
 132
 133
 134         if (!dev)
 135                 return -EINVAL;
 136
 137         /*
 138          * Note that 'dev' references the PIIX4 ACPI Controller.
 139          */
 140
 141         switch (dev->revision) {
 142         case 0:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 144                 break;
 145         case 1:
 146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 147                 break;
 148         case 2:
 149                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 150                 break;
 151         case 3:
 152                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 153                 break;
 154         default:
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 156                 break;
 157         }
 158
 159         switch (dev->revision) {
 160
 161         case 0:         /* PIIX4 A-step */
 162         case 1:         /* PIIX4 B-step */
 163                 /*
 164                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 165                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 166                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 167                  * 2002 PIIX4 specification update.  Applies to only older
 168                  * PIIX4 models.
 169                  */
 170                 errata.piix4.throttle = 1;
 171
 172         case 2:         /* PIIX4E */
 173         case 3:         /* PIIX4M */
 174                 /*
 175                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 176                  * Livelock") from the January 2002 PIIX4 specification update.
 177                  * Applies to all PIIX4 models.
 178                  */
 179
 180                 /*
 181                  * BM-IDE
 182                  * ------
 183                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 184                  * Status register address.  We'll use this later to read
 185                  * each IDE controller's DMA status to make sure we catch all
 186                  * DMA activity.
 187                  */
 188                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 189                                      PCI_DEVICE_ID_INTEL_82371AB,
 190                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 191                 if (dev) {
 192                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 193                         pci_dev_put(dev);
 194                 }
 195
 196                 /*
 197                  * Type-F DMA
 198                  * ----------
 199                  * Find the PIIX4 ISA Controller and read the Motherboard
 200                  * DMA controller's status to see if Type-F (Fast) DMA mode
 201                  * is enabled (bit 7) on either channel.  Note that we'll
 202                  * disable C3 support if this is enabled, as some legacy
 203                  * devices won't operate well if fast DMA is disabled.
 204                  */
 205                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 206                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 207                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 208                 if (dev) {
 209                         pci_read_config_byte(dev, 0x76, &value1);
 210                         pci_read_config_byte(dev, 0x77, &value2);
 211                         if ((value1 & 0x80) || (value2 & 0x80))
 212                                 errata.piix4.fdma = 1;
 213                         pci_dev_put(dev);
 214                 }
 215
 216                 break;
 217         }
 218
 219         if (errata.piix4.bmisx)
 220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 221                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 222         if (errata.piix4.fdma)
 223                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 224                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 225
 226         return 0;
 227 }
 228
 229 static int acpi_processor_errata(struct acpi_processor *pr)
 230 {
 231         int result = 0;
 232         struct pci_dev *dev = NULL;
 233
 234
 235         if (!pr)
 236                 return -EINVAL;
 237
 238         /*
 239          * PIIX4
 240          */
 241         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 242                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 243                              PCI_ANY_ID, NULL);
 244         if (dev) {
 245                 result = acpi_processor_errata_piix4(dev);
 246                 pci_dev_put(dev);
 247         }
 248
 249         return result;
 250 }
 251
 252 /* --------------------------------------------------------------------------
 253                               Common ACPI processor functions
 254    -------------------------------------------------------------------------- */
 255
 256 /*
 257  * _PDC is required for a BIOS-OS handshake for most of the newer
 258  * ACPI processor features.
 259  */
 260 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 261 {
 262         struct acpi_object_list *pdc_in = pr->pdc;
 263         acpi_status status = AE_OK;
 264
 265
 266         if (!pdc_in)
 267                 return status;
 268
 269         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 270
 271         if (ACPI_FAILURE(status))
 272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 273                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 274
 275         return status;
 276 }
 277
 278 /* --------------------------------------------------------------------------
 279                               FS Interface (/proc)
 280    -------------------------------------------------------------------------- */
 281
 282 static struct proc_dir_entry *acpi_processor_dir = NULL;
 283
 284 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 285 {
 286         struct acpi_processor *pr = seq->private;
 287
 288
 289         if (!pr)
 290                 goto end;
 291
 292         seq_printf(seq, "processor id:            %d\n"
 293                    "acpi id:                 %d\n"
 294                    "bus mastering control:   %s\n"
 295                    "power management:        %s\n"
 296                    "throttling control:      %s\n"
 297                    "limit interface:         %s\n",
 298                    pr->id,
 299                    pr->acpi_id,
 300                    pr->flags.bm_control ? "yes" : "no",
 301                    pr->flags.power ? "yes" : "no",
 302                    pr->flags.throttling ? "yes" : "no",
 303                    pr->flags.limit ? "yes" : "no");
 304
 305       end:
 306         return 0;
 307 }
 308
 309 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 310 {
 311         return single_open(file, acpi_processor_info_seq_show,
 312                            PDE(inode)->data);
 313 }
 314
 315 static int acpi_processor_add_fs(struct acpi_device *device)
 316 {
 317         struct proc_dir_entry *entry = NULL;
 318
 319
 320         if (!acpi_device_dir(device)) {
 321                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 322                                                      acpi_processor_dir);
 323                 if (!acpi_device_dir(device))
 324                         return -ENODEV;
 325         }
 326         acpi_device_dir(device)->owner = THIS_MODULE;
 327
 328         /* 'info' [R] */
 329         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 330                                  S_IRUGO, acpi_device_dir(device),
 331                                  &acpi_processor_info_fops,
 332                                  acpi_driver_data(device));
 333         if (!entry)
 334                 return -EIO;
 335
 336         /* 'throttling' [R/W] */
 337         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 338                                  S_IFREG | S_IRUGO | S_IWUSR,
 339                                  acpi_device_dir(device),
 340                                  &acpi_processor_throttling_fops,
 341                                  acpi_driver_data(device));
 342         if (!entry)
 343                 return -EIO;
 344
 345         /* 'limit' [R/W] */
 346         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 347                                  S_IFREG | S_IRUGO | S_IWUSR,
 348                                  acpi_device_dir(device),
 349                                  &acpi_processor_limit_fops,
 350                                  acpi_driver_data(device));
 351         if (!entry)
 352                 return -EIO;
 353         return 0;
 354 }
 355
 356 static int acpi_processor_remove_fs(struct acpi_device *device)
 357 {
 358
 359         if (acpi_device_dir(device)) {
 360                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 361                                   acpi_device_dir(device));
 362                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 363                                   acpi_device_dir(device));
 364                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 365                                   acpi_device_dir(device));
 366                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 367                 acpi_device_dir(device) = NULL;
 368         }
 369
 370         return 0;
 371 }
 372
 373 /* Use the acpiid in MADT to map cpus in case of SMP */
 374
 375 #ifndef CONFIG_SMP
 376 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 377 #else
 378
 379 static struct acpi_table_madt *madt;
 380
 381 static int map_lapic_id(struct acpi_subtable_header *entry,
 382                  u32 acpi_id, int *apic_id)
 383 {
 384         struct acpi_madt_local_apic *lapic =
 385                 (struct acpi_madt_local_apic *)entry;
 386         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 387             lapic->processor_id == acpi_id) {
 388                 *apic_id = lapic->id;
 389                 return 1;
 390         }
 391         return 0;
 392 }
 393
 394 static int map_lsapic_id(struct acpi_subtable_header *entry,
 395                   u32 acpi_id, int *apic_id)
 396 {
 397         struct acpi_madt_local_sapic *lsapic =
 398                 (struct acpi_madt_local_sapic *)entry;
 399         /* Only check enabled APICs*/
 400         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 401                 /* First check against id */
 402                 if (lsapic->processor_id == acpi_id) {
 403                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 404                         return 1;
 405                 /* Check against optional uid */
 406                 } else if (entry->length >= 16 &&
 407                         lsapic->uid == acpi_id) {
 408                         *apic_id = lsapic->uid;
 409                         return 1;
 410                 }
 411         }
 412         return 0;
 413 }
 414
 415 static int map_madt_entry(u32 acpi_id)
 416 {
 417         unsigned long madt_end, entry;
 418         int apic_id = -1;
 419
 420         if (!madt)
 421                 return apic_id;
 422
 423         entry = (unsigned long)madt;
 424         madt_end = entry + madt->header.length;
 425
 426         /* Parse all entries looking for a match. */
 427
 428         entry += sizeof(struct acpi_table_madt);
 429         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 430                 struct acpi_subtable_header *header =
 431                         (struct acpi_subtable_header *)entry;
 432                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 433                         if (map_lapic_id(header, acpi_id, &apic_id))
 434                                 break;
 435                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 436                         if (map_lsapic_id(header, acpi_id, &apic_id))
 437                                 break;
 438                 }
 439                 entry += header->length;
 440         }
 441         return apic_id;
 442 }
 443
 444 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 445 {
 446         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 447         union acpi_object *obj;
 448         struct acpi_subtable_header *header;
 449         int apic_id = -1;
 450
 451         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 452                 goto exit;
 453
 454         if (!buffer.length || !buffer.pointer)
 455                 goto exit;
 456
 457         obj = buffer.pointer;
 458         if (obj->type != ACPI_TYPE_BUFFER ||
 459             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 460                 goto exit;
 461         }
 462
 463         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 464         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 465                 map_lapic_id(header, acpi_id, &apic_id);
 466         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 467                 map_lsapic_id(header, acpi_id, &apic_id);
 468         }
 469
 470 exit:
 471         if (buffer.pointer)
 472                 kfree(buffer.pointer);
 473         return apic_id;
 474 }
 475
 476 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 477 {
 478         int i;
 479         int apic_id = -1;
 480
 481         apic_id = map_mat_entry(handle, acpi_id);
 482         if (apic_id == -1)
 483                 apic_id = map_madt_entry(acpi_id);
 484         if (apic_id == -1)
 485                 return apic_id;
 486
 487         for_each_possible_cpu(i) {
 488                 if (cpu_physical_id(i) == apic_id)
 489                         return i;
 490         }
 491         return -1;
 492 }
 493 #endif
 494
 495 /* --------------------------------------------------------------------------
 496                                  Driver Interface
 497    -------------------------------------------------------------------------- */
 498
 499 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 500 {
 501         acpi_status status = 0;
 502         union acpi_object object = { 0 };
 503         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 504         int cpu_index;
 505         static int cpu0_initialized;
 506
 507
 508         if (!pr)
 509                 return -EINVAL;
 510
 511         if (num_online_cpus() > 1)
 512                 errata.smp = TRUE;
 513
 514         acpi_processor_errata(pr);
 515
 516         /*
 517          * Check to see if we have bus mastering arbitration control.  This
 518          * is required for proper C3 usage (to maintain cache coherency).
 519          */
 520         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 521                 pr->flags.bm_control = 1;
 522                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 523                                   "Bus mastering arbitration control present\n"));
 524         } else
 525                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 526                                   "No bus mastering arbitration control\n"));
 527
 528         /* Check if it is a Device with HID and UID */
 529         if (has_uid) {
 530                 unsigned long value;
 531                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 532                                                 NULL, &value);
 533                 if (ACPI_FAILURE(status)) {
 534                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 535                         return -ENODEV;
 536                 }
 537                 pr->acpi_id = value;
 538         } else {
 539                 /*
 540                 * Evalute the processor object.  Note that it is common on SMP to
 541                 * have the first (boot) processor with a valid PBLK address while
 542                 * all others have a NULL address.
 543                 */
 544                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 545                 if (ACPI_FAILURE(status)) {
 546                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 547                         return -ENODEV;
 548                 }
 549
 550                 /*
 551                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 552                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 553                 */
 554                 pr->acpi_id = object.processor.proc_id;
 555         }
 556         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 557
 558         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 559         if (!cpu0_initialized && (cpu_index == -1) &&
 560             (num_online_cpus() == 1)) {
 561                 cpu_index = 0;
 562         }
 563
 564         cpu0_initialized = 1;
 565
 566         pr->id = cpu_index;
 567
 568         /*
 569          *  Extra Processor objects may be enumerated on MP systems with
 570          *  less than the max # of CPUs. They should be ignored _iff
 571          *  they are physically not present.
 572          */
 573         if (pr->id == -1) {
 574                 if (ACPI_FAILURE
 575                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 576                         return -ENODEV;
 577                 }
 578         }
 579
 580         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 581                           pr->acpi_id));
 582
 583         if (!object.processor.pblk_address)
 584                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 585         else if (object.processor.pblk_length != 6)
 586                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 587                             object.processor.pblk_length);
 588         else {
 589                 pr->throttling.address = object.processor.pblk_address;
 590                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 591                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 592
 593                 pr->pblk = object.processor.pblk_address;
 594
 595                 /*
 596                  * We don't care about error returns - we just try to mark
 597                  * these reserved so that nobody else is confused into thinking
 598                  * that this region might be unused..
 599                  *
 600                  * (In particular, allocating the IO range for Cardbus)
 601                  */
 602                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 603         }
 604
 605         /*
 606          * If ACPI describes a slot number for this CPU, we can use it
 607          * ensure we get the right value in the "physical id" field
 608          * of /proc/cpuinfo
 609          */
 610         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 611         if (ACPI_SUCCESS(status))
 612                 arch_fix_phys_package_id(pr->id, object.integer.value);
 613
 614         return 0;
 615 }
 616
 617 static DEFINE_PER_CPU(void *, processor_device_array);
 618
 619 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 620 {
 621         int result = 0;
 622         acpi_status status = AE_OK;
 623         struct acpi_processor *pr;
 624         struct sys_device *sysdev;
 625
 626         pr = acpi_driver_data(device);
 627
 628         result = acpi_processor_get_info(pr, device->flags.unique_id);
 629         if (result) {
 630                 /* Processor is physically not present */
 631                 return 0;
 632         }
 633
 634         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 635
 636         /*
 637          * Buggy BIOS check
 638          * ACPI id of processors can be reported wrongly by the BIOS.
 639          * Don't trust it blindly
 640          */
 641         if (per_cpu(processor_device_array, pr->id) != NULL &&
 642             per_cpu(processor_device_array, pr->id) != device) {
 643                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 644                         "for the processor\n");
 645                 return -ENODEV;
 646         }
 647         per_cpu(processor_device_array, pr->id) = device;
 648
 649         per_cpu(processors, pr->id) = pr;
 650
 651         result = acpi_processor_add_fs(device);
 652         if (result)
 653                 goto end;
 654
 655         sysdev = get_cpu_sysdev(pr->id);
 656         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 657                 return -EFAULT;
 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 #ifdef CONFIG_CPU_FREQ
 666         acpi_processor_ppc_has_changed(pr);
 667 #endif
 668         acpi_processor_get_throttling_info(pr);
 669         acpi_processor_get_limit_info(pr);
 670
 671
 672         acpi_processor_power_init(pr, device);
 673
 674         pr->cdev = thermal_cooling_device_register("Processor", device,
 675                                                 &processor_cooling_ops);
 676         if (IS_ERR(pr->cdev)) {
 677                 result = PTR_ERR(pr->cdev);
 678                 goto end;
 679         }
 680
 681         printk(KERN_INFO PREFIX
 682                 "%s is registered as cooling_device%d\n",
 683                 device->dev.bus_id, pr->cdev->id);
 684
 685         result = sysfs_create_link(&device->dev.kobj,
 686                                    &pr->cdev->device.kobj,
 687                                    "thermal_cooling");
 688         if (result)
 689                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 690         result = sysfs_create_link(&pr->cdev->device.kobj,
 691                                    &device->dev.kobj,
 692                                    "device");
 693         if (result)
 694                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 695
 696         if (pr->flags.throttling) {
 697                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 698                        acpi_device_name(device), acpi_device_bid(device));
 699                 printk(" %d throttling states", pr->throttling.state_count);
 700                 printk(")\n");
 701         }
 702
 703       end:
 704
 705         return result;
 706 }
 707
 708 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 709 {
 710         struct acpi_processor *pr = data;
 711         struct acpi_device *device = NULL;
 712         int saved;
 713
 714         if (!pr)
 715                 return;
 716
 717         if (acpi_bus_get_device(pr->handle, &device))
 718                 return;
 719
 720         switch (event) {
 721         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 722                 saved = pr->performance_platform_limit;
 723                 acpi_processor_ppc_has_changed(pr);
 724                 if (saved == pr->performance_platform_limit)
 725                         break;
 726                 acpi_bus_generate_proc_event(device, event,
 727                                         pr->performance_platform_limit);
 728                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 729                                                   device->dev.bus_id, event,
 730                                                   pr->performance_platform_limit);
 731                 break;
 732         case ACPI_PROCESSOR_NOTIFY_POWER:
 733                 acpi_processor_cst_has_changed(pr);
 734                 acpi_bus_generate_proc_event(device, event, 0);
 735                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 736                                                   device->dev.bus_id, event, 0);
 737                 break;
 738         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 739                 acpi_processor_tstate_has_changed(pr);
 740                 acpi_bus_generate_proc_event(device, event, 0);
 741                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 742                                                   device->dev.bus_id, event, 0);
 743         default:
 744                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 745                                   "Unsupported event [0x%x]\n", event));
 746                 break;
 747         }
 748
 749         return;
 750 }
 751
 752 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 753                 unsigned long action, void *hcpu)
 754 {
 755         unsigned int cpu = (unsigned long)hcpu;
 756         struct acpi_processor *pr = per_cpu(processors, cpu);
 757
 758         if (action == CPU_ONLINE && pr) {
 759                 acpi_processor_ppc_has_changed(pr);
 760                 acpi_processor_cst_has_changed(pr);
 761                 acpi_processor_tstate_has_changed(pr);
 762         }
 763         return NOTIFY_OK;
 764 }
 765
 766 static struct notifier_block acpi_cpu_notifier =
 767 {
 768             .notifier_call = acpi_cpu_soft_notify,
 769 };
 770
 771 static int acpi_processor_add(struct acpi_device *device)
 772 {
 773         struct acpi_processor *pr = NULL;
 774
 775
 776         if (!device)
 777                 return -EINVAL;
 778
 779         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 780         if (!pr)
 781                 return -ENOMEM;
 782
 783         pr->handle = device->handle;
 784         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 785         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 786         acpi_driver_data(device) = pr;
 787
 788         return 0;
 789 }
 790
 791 static int acpi_processor_remove(struct acpi_device *device, int type)
 792 {
 793         acpi_status status = AE_OK;
 794         struct acpi_processor *pr = NULL;
 795
 796
 797         if (!device || !acpi_driver_data(device))
 798                 return -EINVAL;
 799
 800         pr = acpi_driver_data(device);
 801
 802         if (pr->id >= nr_cpu_ids) {
 803                 kfree(pr);
 804                 return 0;
 805         }
 806
 807         if (type == ACPI_BUS_REMOVAL_EJECT) {
 808                 if (acpi_processor_handle_eject(pr))
 809                         return -EINVAL;
 810         }
 811
 812         acpi_processor_power_exit(pr, device);
 813
 814         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 815                                             acpi_processor_notify);
 816
 817         sysfs_remove_link(&device->dev.kobj, "sysdev");
 818
 819         acpi_processor_remove_fs(device);
 820
 821         if (pr->cdev) {
 822                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 823                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 824                 thermal_cooling_device_unregister(pr->cdev);
 825                 pr->cdev = NULL;
 826         }
 827
 828         per_cpu(processors, pr->id) = NULL;
 829         per_cpu(processor_device_array, pr->id) = NULL;
 830         kfree(pr);
 831
 832         return 0;
 833 }
 834
 835 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 836 /****************************************************************************
 837  *      Acpi processor hotplug support                                      *
 838  ****************************************************************************/
 839
 840 static int is_processor_present(acpi_handle handle)
 841 {
 842         acpi_status status;
 843         unsigned long sta = 0;
 844
 845
 846         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 847
 848         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 849                 return 1;
 850
 851         /*
 852          * _STA is mandatory for a processor that supports hot plug
 853          */
 854         if (status == AE_NOT_FOUND)
 855                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 856                                 "Processor does not support hot plug\n"));
 857         else
 858                 ACPI_EXCEPTION((AE_INFO, status,
 859                                 "Processor Device is not present"));
 860         return 0;
 861 }
 862
 863 static
 864 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 865 {
 866         acpi_handle phandle;
 867         struct acpi_device *pdev;
 868         struct acpi_processor *pr;
 869
 870
 871         if (acpi_get_parent(handle, &phandle)) {
 872                 return -ENODEV;
 873         }
 874
 875         if (acpi_bus_get_device(phandle, &pdev)) {
 876                 return -ENODEV;
 877         }
 878
 879         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 880                 return -ENODEV;
 881         }
 882
 883         acpi_bus_start(*device);
 884
 885         pr = acpi_driver_data(*device);
 886         if (!pr)
 887                 return -ENODEV;
 888
 889         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 890                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 891         }
 892         return 0;
 893 }
 894
 895 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 896                                                 u32 event, void *data)
 897 {
 898         struct acpi_processor *pr;
 899         struct acpi_device *device = NULL;
 900         int result;
 901
 902
 903         switch (event) {
 904         case ACPI_NOTIFY_BUS_CHECK:
 905         case ACPI_NOTIFY_DEVICE_CHECK:
 906                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 907                 "Processor driver received %s event\n",
 908                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 909                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 910
 911                 if (!is_processor_present(handle))
 912                         break;
 913
 914                 if (acpi_bus_get_device(handle, &device)) {
 915                         result = acpi_processor_device_add(handle, &device);
 916                         if (result)
 917                                 printk(KERN_ERR PREFIX
 918                                             "Unable to add the device\n");
 919                         break;
 920                 }
 921
 922                 pr = acpi_driver_data(device);
 923                 if (!pr) {
 924                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 925                         break;
 926                 }
 927
 928                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 929                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 930                         break;
 931                 }
 932
 933                 result = acpi_processor_start(device);
 934                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 935                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 936                 } else {
 937                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 938                                     acpi_device_bid(device));
 939                 }
 940                 break;
 941         case ACPI_NOTIFY_EJECT_REQUEST:
 942                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 943                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 944
 945                 if (acpi_bus_get_device(handle, &device)) {
 946                         printk(KERN_ERR PREFIX
 947                                     "Device don't exist, dropping EJECT\n");
 948                         break;
 949                 }
 950                 pr = acpi_driver_data(device);
 951                 if (!pr) {
 952                         printk(KERN_ERR PREFIX
 953                                     "Driver data is NULL, dropping EJECT\n");
 954                         return;
 955                 }
 956
 957                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
 958                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 959                 break;
 960         default:
 961                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 962                                   "Unsupported event [0x%x]\n", event));
 963                 break;
 964         }
 965
 966         return;
 967 }
 968
 969 static acpi_status
 970 processor_walk_namespace_cb(acpi_handle handle,
 971                             u32 lvl, void *context, void **rv)
 972 {
 973         acpi_status status;
 974         int *action = context;
 975         acpi_object_type type = 0;
 976
 977         status = acpi_get_type(handle, &type);
 978         if (ACPI_FAILURE(status))
 979                 return (AE_OK);
 980
 981         if (type != ACPI_TYPE_PROCESSOR)
 982                 return (AE_OK);
 983
 984         switch (*action) {
 985         case INSTALL_NOTIFY_HANDLER:
 986                 acpi_install_notify_handler(handle,
 987                                             ACPI_SYSTEM_NOTIFY,
 988                                             acpi_processor_hotplug_notify,
 989                                             NULL);
 990                 break;
 991         case UNINSTALL_NOTIFY_HANDLER:
 992                 acpi_remove_notify_handler(handle,
 993                                            ACPI_SYSTEM_NOTIFY,
 994                                            acpi_processor_hotplug_notify);
 995                 break;
 996         default:
 997                 break;
 998         }
 999
1000         return (AE_OK);
1001 }
1002
1003 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1004 {
1005
1006         if (!is_processor_present(handle)) {
1007                 return AE_ERROR;
1008         }
1009
1010         if (acpi_map_lsapic(handle, p_cpu))
1011                 return AE_ERROR;
1012
1013         if (arch_register_cpu(*p_cpu)) {
1014                 acpi_unmap_lsapic(*p_cpu);
1015                 return AE_ERROR;
1016         }
1017
1018         return AE_OK;
1019 }
1020
1021 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1022 {
1023         if (cpu_online(pr->id))
1024                 cpu_down(pr->id);
1025
1026         arch_unregister_cpu(pr->id);
1027         acpi_unmap_lsapic(pr->id);
1028         return (0);
1029 }
1030 #else
1031 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1032 {
1033         return AE_ERROR;
1034 }
1035 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1036 {
1037         return (-EINVAL);
1038 }
1039 #endif
1040
1041 static
1042 void acpi_processor_install_hotplug_notify(void)
1043 {
1044 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1045         int action = INSTALL_NOTIFY_HANDLER;
1046         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1047                             ACPI_ROOT_OBJECT,
1048                             ACPI_UINT32_MAX,
1049                             processor_walk_namespace_cb, &action, NULL);
1050 #endif
1051         register_hotcpu_notifier(&acpi_cpu_notifier);
1052 }
1053
1054 static
1055 void acpi_processor_uninstall_hotplug_notify(void)
1056 {
1057 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1058         int action = UNINSTALL_NOTIFY_HANDLER;
1059         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1060                             ACPI_ROOT_OBJECT,
1061                             ACPI_UINT32_MAX,
1062                             processor_walk_namespace_cb, &action, NULL);
1063 #endif
1064         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1065 }
1066
1067 /*
1068  * We keep the driver loaded even when ACPI is not running.
1069  * This is needed for the powernow-k8 driver, that works even without
1070  * ACPI, but needs symbols from this driver
1071  */
1072
1073 static int __init acpi_processor_init(void)
1074 {
1075         int result = 0;
1076
1077         memset(&errata, 0, sizeof(errata));
1078
1079 #ifdef CONFIG_SMP
1080         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1081                                 (struct acpi_table_header **)&madt)))
1082                 madt = NULL;
1083 #endif
1084
1085         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1086         if (!acpi_processor_dir)
1087                 return -ENOMEM;
1088         acpi_processor_dir->owner = THIS_MODULE;
1089
1090         result = cpuidle_register_driver(&acpi_idle_driver);
1091         if (result < 0)
1092                 goto out_proc;
1093
1094         result = acpi_bus_register_driver(&acpi_processor_driver);
1095         if (result < 0)
1096                 goto out_cpuidle;
1097
1098         acpi_processor_install_hotplug_notify();
1099
1100         acpi_thermal_cpufreq_init();
1101
1102         acpi_processor_ppc_init();
1103
1104         acpi_processor_throttling_init();
1105
1106         return 0;
1107
1108 out_cpuidle:
1109         cpuidle_unregister_driver(&acpi_idle_driver);
1110
1111 out_proc:
1112         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1113
1114         return result;
1115 }
1116
1117 static void __exit acpi_processor_exit(void)
1118 {
1119         acpi_processor_ppc_exit();
1120
1121         acpi_thermal_cpufreq_exit();
1122
1123         acpi_processor_uninstall_hotplug_notify();
1124
1125         acpi_bus_unregister_driver(&acpi_processor_driver);
1126
1127         cpuidle_unregister_driver(&acpi_idle_driver);
1128
1129         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1130
1131         return;
1132 }
1133
1134 module_init(acpi_processor_init);
1135 module_exit(acpi_processor_exit);
1136
1137 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1138
1139 MODULE_ALIAS("processor");