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