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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 static int set_no_mwait(const struct dmi_system_id *id)
 124 {
 125         printk(KERN_NOTICE PREFIX "%s detected - "
 126                 "disabling mwait for CPU C-states\n", id->ident);
 127         idle_nomwait = 1;
 128         return 0;
 129 }
 130
 131 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
 132         {
 133         set_no_mwait, "IFL91 board", {
 134         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
 135         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
 136         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
 137         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
 138         {
 139         set_no_mwait, "Extensa 5220", {
 140         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
 141         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 142         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
 143         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
 144         {},
 145 };
 146
 147 /* --------------------------------------------------------------------------
 148                                 Errata Handling
 149    -------------------------------------------------------------------------- */
 150
 151 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 152 {
 153         u8 value1 = 0;
 154         u8 value2 = 0;
 155
 156
 157         if (!dev)
 158                 return -EINVAL;
 159
 160         /*
 161          * Note that 'dev' references the PIIX4 ACPI Controller.
 162          */
 163
 164         switch (dev->revision) {
 165         case 0:
 166                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 167                 break;
 168         case 1:
 169                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 170                 break;
 171         case 2:
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 173                 break;
 174         case 3:
 175                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 176                 break;
 177         default:
 178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 179                 break;
 180         }
 181
 182         switch (dev->revision) {
 183
 184         case 0:         /* PIIX4 A-step */
 185         case 1:         /* PIIX4 B-step */
 186                 /*
 187                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 188                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 189                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 190                  * 2002 PIIX4 specification update.  Applies to only older
 191                  * PIIX4 models.
 192                  */
 193                 errata.piix4.throttle = 1;
 194
 195         case 2:         /* PIIX4E */
 196         case 3:         /* PIIX4M */
 197                 /*
 198                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 199                  * Livelock") from the January 2002 PIIX4 specification update.
 200                  * Applies to all PIIX4 models.
 201                  */
 202
 203                 /*
 204                  * BM-IDE
 205                  * ------
 206                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 207                  * Status register address.  We'll use this later to read
 208                  * each IDE controller's DMA status to make sure we catch all
 209                  * DMA activity.
 210                  */
 211                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 212                                      PCI_DEVICE_ID_INTEL_82371AB,
 213                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 214                 if (dev) {
 215                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 216                         pci_dev_put(dev);
 217                 }
 218
 219                 /*
 220                  * Type-F DMA
 221                  * ----------
 222                  * Find the PIIX4 ISA Controller and read the Motherboard
 223                  * DMA controller's status to see if Type-F (Fast) DMA mode
 224                  * is enabled (bit 7) on either channel.  Note that we'll
 225                  * disable C3 support if this is enabled, as some legacy
 226                  * devices won't operate well if fast DMA is disabled.
 227                  */
 228                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 229                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 230                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 231                 if (dev) {
 232                         pci_read_config_byte(dev, 0x76, &value1);
 233                         pci_read_config_byte(dev, 0x77, &value2);
 234                         if ((value1 & 0x80) || (value2 & 0x80))
 235                                 errata.piix4.fdma = 1;
 236                         pci_dev_put(dev);
 237                 }
 238
 239                 break;
 240         }
 241
 242         if (errata.piix4.bmisx)
 243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 244                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 245         if (errata.piix4.fdma)
 246                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 247                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 248
 249         return 0;
 250 }
 251
 252 static int acpi_processor_errata(struct acpi_processor *pr)
 253 {
 254         int result = 0;
 255         struct pci_dev *dev = NULL;
 256
 257
 258         if (!pr)
 259                 return -EINVAL;
 260
 261         /*
 262          * PIIX4
 263          */
 264         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 265                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 266                              PCI_ANY_ID, NULL);
 267         if (dev) {
 268                 result = acpi_processor_errata_piix4(dev);
 269                 pci_dev_put(dev);
 270         }
 271
 272         return result;
 273 }
 274
 275 /* --------------------------------------------------------------------------
 276                               Common ACPI processor functions
 277    -------------------------------------------------------------------------- */
 278
 279 /*
 280  * _PDC is required for a BIOS-OS handshake for most of the newer
 281  * ACPI processor features.
 282  */
 283 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 284 {
 285         struct acpi_object_list *pdc_in = pr->pdc;
 286         acpi_status status = AE_OK;
 287
 288
 289         if (!pdc_in)
 290                 return status;
 291         if (idle_nomwait) {
 292                 /*
 293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 294                  * mode will be disabled in the parameter of _PDC object.
 295                  * Of course C1_FFH access mode will also be disabled.
 296                  */
 297                 union acpi_object *obj;
 298                 u32 *buffer = NULL;
 299
 300                 obj = pdc_in->pointer;
 301                 buffer = (u32 *)(obj->buffer.pointer);
 302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 303
 304         }
 305         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 306
 307         if (ACPI_FAILURE(status))
 308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 309                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 310
 311         return status;
 312 }
 313
 314 /* --------------------------------------------------------------------------
 315                               FS Interface (/proc)
 316    -------------------------------------------------------------------------- */
 317
 318 static struct proc_dir_entry *acpi_processor_dir = NULL;
 319
 320 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 321 {
 322         struct acpi_processor *pr = seq->private;
 323
 324
 325         if (!pr)
 326                 goto end;
 327
 328         seq_printf(seq, "processor id:            %d\n"
 329                    "acpi id:                 %d\n"
 330                    "bus mastering control:   %s\n"
 331                    "power management:        %s\n"
 332                    "throttling control:      %s\n"
 333                    "limit interface:         %s\n",
 334                    pr->id,
 335                    pr->acpi_id,
 336                    pr->flags.bm_control ? "yes" : "no",
 337                    pr->flags.power ? "yes" : "no",
 338                    pr->flags.throttling ? "yes" : "no",
 339                    pr->flags.limit ? "yes" : "no");
 340
 341       end:
 342         return 0;
 343 }
 344
 345 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 346 {
 347         return single_open(file, acpi_processor_info_seq_show,
 348                            PDE(inode)->data);
 349 }
 350
 351 static int acpi_processor_add_fs(struct acpi_device *device)
 352 {
 353         struct proc_dir_entry *entry = NULL;
 354
 355
 356         if (!acpi_device_dir(device)) {
 357                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 358                                                      acpi_processor_dir);
 359                 if (!acpi_device_dir(device))
 360                         return -ENODEV;
 361         }
 362         acpi_device_dir(device)->owner = THIS_MODULE;
 363
 364         /* 'info' [R] */
 365         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 366                                  S_IRUGO, acpi_device_dir(device),
 367                                  &acpi_processor_info_fops,
 368                                  acpi_driver_data(device));
 369         if (!entry)
 370                 return -EIO;
 371
 372         /* 'throttling' [R/W] */
 373         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 374                                  S_IFREG | S_IRUGO | S_IWUSR,
 375                                  acpi_device_dir(device),
 376                                  &acpi_processor_throttling_fops,
 377                                  acpi_driver_data(device));
 378         if (!entry)
 379                 return -EIO;
 380
 381         /* 'limit' [R/W] */
 382         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 383                                  S_IFREG | S_IRUGO | S_IWUSR,
 384                                  acpi_device_dir(device),
 385                                  &acpi_processor_limit_fops,
 386                                  acpi_driver_data(device));
 387         if (!entry)
 388                 return -EIO;
 389         return 0;
 390 }
 391
 392 static int acpi_processor_remove_fs(struct acpi_device *device)
 393 {
 394
 395         if (acpi_device_dir(device)) {
 396                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 397                                   acpi_device_dir(device));
 398                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 399                                   acpi_device_dir(device));
 400                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 401                                   acpi_device_dir(device));
 402                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 403                 acpi_device_dir(device) = NULL;
 404         }
 405
 406         return 0;
 407 }
 408
 409 /* Use the acpiid in MADT to map cpus in case of SMP */
 410
 411 #ifndef CONFIG_SMP
 412 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 413 #else
 414
 415 static struct acpi_table_madt *madt;
 416
 417 static int map_lapic_id(struct acpi_subtable_header *entry,
 418                  u32 acpi_id, int *apic_id)
 419 {
 420         struct acpi_madt_local_apic *lapic =
 421                 (struct acpi_madt_local_apic *)entry;
 422         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 423             lapic->processor_id == acpi_id) {
 424                 *apic_id = lapic->id;
 425                 return 1;
 426         }
 427         return 0;
 428 }
 429
 430 static int map_lsapic_id(struct acpi_subtable_header *entry,
 431                   u32 acpi_id, int *apic_id)
 432 {
 433         struct acpi_madt_local_sapic *lsapic =
 434                 (struct acpi_madt_local_sapic *)entry;
 435         /* Only check enabled APICs*/
 436         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 437                 /* First check against id */
 438                 if (lsapic->processor_id == acpi_id) {
 439                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 440                         return 1;
 441                 /* Check against optional uid */
 442                 } else if (entry->length >= 16 &&
 443                         lsapic->uid == acpi_id) {
 444                         *apic_id = lsapic->uid;
 445                         return 1;
 446                 }
 447         }
 448         return 0;
 449 }
 450
 451 static int map_madt_entry(u32 acpi_id)
 452 {
 453         unsigned long madt_end, entry;
 454         int apic_id = -1;
 455
 456         if (!madt)
 457                 return apic_id;
 458
 459         entry = (unsigned long)madt;
 460         madt_end = entry + madt->header.length;
 461
 462         /* Parse all entries looking for a match. */
 463
 464         entry += sizeof(struct acpi_table_madt);
 465         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 466                 struct acpi_subtable_header *header =
 467                         (struct acpi_subtable_header *)entry;
 468                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 469                         if (map_lapic_id(header, acpi_id, &apic_id))
 470                                 break;
 471                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 472                         if (map_lsapic_id(header, acpi_id, &apic_id))
 473                                 break;
 474                 }
 475                 entry += header->length;
 476         }
 477         return apic_id;
 478 }
 479
 480 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 481 {
 482         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 483         union acpi_object *obj;
 484         struct acpi_subtable_header *header;
 485         int apic_id = -1;
 486
 487         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 488                 goto exit;
 489
 490         if (!buffer.length || !buffer.pointer)
 491                 goto exit;
 492
 493         obj = buffer.pointer;
 494         if (obj->type != ACPI_TYPE_BUFFER ||
 495             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 496                 goto exit;
 497         }
 498
 499         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 500         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 501                 map_lapic_id(header, acpi_id, &apic_id);
 502         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 503                 map_lsapic_id(header, acpi_id, &apic_id);
 504         }
 505
 506 exit:
 507         if (buffer.pointer)
 508                 kfree(buffer.pointer);
 509         return apic_id;
 510 }
 511
 512 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 513 {
 514         int i;
 515         int apic_id = -1;
 516
 517         apic_id = map_mat_entry(handle, acpi_id);
 518         if (apic_id == -1)
 519                 apic_id = map_madt_entry(acpi_id);
 520         if (apic_id == -1)
 521                 return apic_id;
 522
 523         for_each_possible_cpu(i) {
 524                 if (cpu_physical_id(i) == apic_id)
 525                         return i;
 526         }
 527         return -1;
 528 }
 529 #endif
 530
 531 /* --------------------------------------------------------------------------
 532                                  Driver Interface
 533    -------------------------------------------------------------------------- */
 534
 535 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 536 {
 537         acpi_status status = 0;
 538         union acpi_object object = { 0 };
 539         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 540         int cpu_index;
 541         static int cpu0_initialized;
 542
 543
 544         if (!pr)
 545                 return -EINVAL;
 546
 547         if (num_online_cpus() > 1)
 548                 errata.smp = TRUE;
 549
 550         acpi_processor_errata(pr);
 551
 552         /*
 553          * Check to see if we have bus mastering arbitration control.  This
 554          * is required for proper C3 usage (to maintain cache coherency).
 555          */
 556         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 557                 pr->flags.bm_control = 1;
 558                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 559                                   "Bus mastering arbitration control present\n"));
 560         } else
 561                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 562                                   "No bus mastering arbitration control\n"));
 563
 564         /* Check if it is a Device with HID and UID */
 565         if (has_uid) {
 566                 unsigned long value;
 567                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 568                                                 NULL, &value);
 569                 if (ACPI_FAILURE(status)) {
 570                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 571                         return -ENODEV;
 572                 }
 573                 pr->acpi_id = value;
 574         } else {
 575                 /*
 576                 * Evalute the processor object.  Note that it is common on SMP to
 577                 * have the first (boot) processor with a valid PBLK address while
 578                 * all others have a NULL address.
 579                 */
 580                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 581                 if (ACPI_FAILURE(status)) {
 582                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 583                         return -ENODEV;
 584                 }
 585
 586                 /*
 587                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 588                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 589                 */
 590                 pr->acpi_id = object.processor.proc_id;
 591         }
 592         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 593
 594         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 595         if (!cpu0_initialized && (cpu_index == -1) &&
 596             (num_online_cpus() == 1)) {
 597                 cpu_index = 0;
 598         }
 599
 600         cpu0_initialized = 1;
 601
 602         pr->id = cpu_index;
 603
 604         /*
 605          *  Extra Processor objects may be enumerated on MP systems with
 606          *  less than the max # of CPUs. They should be ignored _iff
 607          *  they are physically not present.
 608          */
 609         if (pr->id == -1) {
 610                 if (ACPI_FAILURE
 611                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 612                         return -ENODEV;
 613                 }
 614         }
 615
 616         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 617                           pr->acpi_id));
 618
 619         if (!object.processor.pblk_address)
 620                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 621         else if (object.processor.pblk_length != 6)
 622                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 623                             object.processor.pblk_length);
 624         else {
 625                 pr->throttling.address = object.processor.pblk_address;
 626                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 627                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 628
 629                 pr->pblk = object.processor.pblk_address;
 630
 631                 /*
 632                  * We don't care about error returns - we just try to mark
 633                  * these reserved so that nobody else is confused into thinking
 634                  * that this region might be unused..
 635                  *
 636                  * (In particular, allocating the IO range for Cardbus)
 637                  */
 638                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 639         }
 640
 641         /*
 642          * If ACPI describes a slot number for this CPU, we can use it
 643          * ensure we get the right value in the "physical id" field
 644          * of /proc/cpuinfo
 645          */
 646         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 647         if (ACPI_SUCCESS(status))
 648                 arch_fix_phys_package_id(pr->id, object.integer.value);
 649
 650         return 0;
 651 }
 652
 653 static DEFINE_PER_CPU(void *, processor_device_array);
 654
 655 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 656 {
 657         int result = 0;
 658         acpi_status status = AE_OK;
 659         struct acpi_processor *pr;
 660         struct sys_device *sysdev;
 661
 662         pr = acpi_driver_data(device);
 663
 664         result = acpi_processor_get_info(pr, device->flags.unique_id);
 665         if (result) {
 666                 /* Processor is physically not present */
 667                 return 0;
 668         }
 669
 670         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 671
 672         /*
 673          * Buggy BIOS check
 674          * ACPI id of processors can be reported wrongly by the BIOS.
 675          * Don't trust it blindly
 676          */
 677         if (per_cpu(processor_device_array, pr->id) != NULL &&
 678             per_cpu(processor_device_array, pr->id) != device) {
 679                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 680                         "for the processor\n");
 681                 return -ENODEV;
 682         }
 683         per_cpu(processor_device_array, pr->id) = device;
 684
 685         per_cpu(processors, pr->id) = pr;
 686
 687         result = acpi_processor_add_fs(device);
 688         if (result)
 689                 goto end;
 690
 691         sysdev = get_cpu_sysdev(pr->id);
 692         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
 693                 return -EFAULT;
 694
 695         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 696                                              acpi_processor_notify, pr);
 697
 698         /* _PDC call should be done before doing anything else (if reqd.). */
 699         arch_acpi_processor_init_pdc(pr);
 700         acpi_processor_set_pdc(pr);
 701 #ifdef CONFIG_CPU_FREQ
 702         acpi_processor_ppc_has_changed(pr);
 703 #endif
 704         acpi_processor_get_throttling_info(pr);
 705         acpi_processor_get_limit_info(pr);
 706
 707
 708         acpi_processor_power_init(pr, device);
 709
 710         pr->cdev = thermal_cooling_device_register("Processor", device,
 711                                                 &processor_cooling_ops);
 712         if (IS_ERR(pr->cdev)) {
 713                 result = PTR_ERR(pr->cdev);
 714                 goto end;
 715         }
 716
 717         dev_info(&device->dev, "registered as cooling_device%d\n",
 718                  pr->cdev->id);
 719
 720         result = sysfs_create_link(&device->dev.kobj,
 721                                    &pr->cdev->device.kobj,
 722                                    "thermal_cooling");
 723         if (result)
 724                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 725         result = sysfs_create_link(&pr->cdev->device.kobj,
 726                                    &device->dev.kobj,
 727                                    "device");
 728         if (result)
 729                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 730
 731         if (pr->flags.throttling) {
 732                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 733                        acpi_device_name(device), acpi_device_bid(device));
 734                 printk(" %d throttling states", pr->throttling.state_count);
 735                 printk(")\n");
 736         }
 737
 738       end:
 739
 740         return result;
 741 }
 742
 743 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 744 {
 745         struct acpi_processor *pr = data;
 746         struct acpi_device *device = NULL;
 747         int saved;
 748
 749         if (!pr)
 750                 return;
 751
 752         if (acpi_bus_get_device(pr->handle, &device))
 753                 return;
 754
 755         switch (event) {
 756         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 757                 saved = pr->performance_platform_limit;
 758                 acpi_processor_ppc_has_changed(pr);
 759                 if (saved == pr->performance_platform_limit)
 760                         break;
 761                 acpi_bus_generate_proc_event(device, event,
 762                                         pr->performance_platform_limit);
 763                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 764                                                   device->dev.bus_id, event,
 765                                                   pr->performance_platform_limit);
 766                 break;
 767         case ACPI_PROCESSOR_NOTIFY_POWER:
 768                 acpi_processor_cst_has_changed(pr);
 769                 acpi_bus_generate_proc_event(device, event, 0);
 770                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 771                                                   device->dev.bus_id, event, 0);
 772                 break;
 773         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 774                 acpi_processor_tstate_has_changed(pr);
 775                 acpi_bus_generate_proc_event(device, event, 0);
 776                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 777                                                   device->dev.bus_id, event, 0);
 778         default:
 779                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 780                                   "Unsupported event [0x%x]\n", event));
 781                 break;
 782         }
 783
 784         return;
 785 }
 786
 787 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 788                 unsigned long action, void *hcpu)
 789 {
 790         unsigned int cpu = (unsigned long)hcpu;
 791         struct acpi_processor *pr = per_cpu(processors, cpu);
 792
 793         if (action == CPU_ONLINE && pr) {
 794                 acpi_processor_ppc_has_changed(pr);
 795                 acpi_processor_cst_has_changed(pr);
 796                 acpi_processor_tstate_has_changed(pr);
 797         }
 798         return NOTIFY_OK;
 799 }
 800
 801 static struct notifier_block acpi_cpu_notifier =
 802 {
 803             .notifier_call = acpi_cpu_soft_notify,
 804 };
 805
 806 static int acpi_processor_add(struct acpi_device *device)
 807 {
 808         struct acpi_processor *pr = NULL;
 809
 810
 811         if (!device)
 812                 return -EINVAL;
 813
 814         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 815         if (!pr)
 816                 return -ENOMEM;
 817
 818         pr->handle = device->handle;
 819         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 820         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 821         acpi_driver_data(device) = pr;
 822
 823         return 0;
 824 }
 825
 826 static int acpi_processor_remove(struct acpi_device *device, int type)
 827 {
 828         acpi_status status = AE_OK;
 829         struct acpi_processor *pr = NULL;
 830
 831
 832         if (!device || !acpi_driver_data(device))
 833                 return -EINVAL;
 834
 835         pr = acpi_driver_data(device);
 836
 837         if (pr->id >= nr_cpu_ids) {
 838                 kfree(pr);
 839                 return 0;
 840         }
 841
 842         if (type == ACPI_BUS_REMOVAL_EJECT) {
 843                 if (acpi_processor_handle_eject(pr))
 844                         return -EINVAL;
 845         }
 846
 847         acpi_processor_power_exit(pr, device);
 848
 849         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 850                                             acpi_processor_notify);
 851
 852         sysfs_remove_link(&device->dev.kobj, "sysdev");
 853
 854         acpi_processor_remove_fs(device);
 855
 856         if (pr->cdev) {
 857                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 858                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 859                 thermal_cooling_device_unregister(pr->cdev);
 860                 pr->cdev = NULL;
 861         }
 862
 863         per_cpu(processors, pr->id) = NULL;
 864         per_cpu(processor_device_array, pr->id) = NULL;
 865         kfree(pr);
 866
 867         return 0;
 868 }
 869
 870 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 871 /****************************************************************************
 872  *      Acpi processor hotplug support                                      *
 873  ****************************************************************************/
 874
 875 static int is_processor_present(acpi_handle handle)
 876 {
 877         acpi_status status;
 878         unsigned long sta = 0;
 879
 880
 881         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 882
 883         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 884                 return 1;
 885
 886         /*
 887          * _STA is mandatory for a processor that supports hot plug
 888          */
 889         if (status == AE_NOT_FOUND)
 890                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 891                                 "Processor does not support hot plug\n"));
 892         else
 893                 ACPI_EXCEPTION((AE_INFO, status,
 894                                 "Processor Device is not present"));
 895         return 0;
 896 }
 897
 898 static
 899 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 900 {
 901         acpi_handle phandle;
 902         struct acpi_device *pdev;
 903         struct acpi_processor *pr;
 904
 905
 906         if (acpi_get_parent(handle, &phandle)) {
 907                 return -ENODEV;
 908         }
 909
 910         if (acpi_bus_get_device(phandle, &pdev)) {
 911                 return -ENODEV;
 912         }
 913
 914         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 915                 return -ENODEV;
 916         }
 917
 918         acpi_bus_start(*device);
 919
 920         pr = acpi_driver_data(*device);
 921         if (!pr)
 922                 return -ENODEV;
 923
 924         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
 925                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 926         }
 927         return 0;
 928 }
 929
 930 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 931                                                 u32 event, void *data)
 932 {
 933         struct acpi_processor *pr;
 934         struct acpi_device *device = NULL;
 935         int result;
 936
 937
 938         switch (event) {
 939         case ACPI_NOTIFY_BUS_CHECK:
 940         case ACPI_NOTIFY_DEVICE_CHECK:
 941                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 942                 "Processor driver received %s event\n",
 943                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 944                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 945
 946                 if (!is_processor_present(handle))
 947                         break;
 948
 949                 if (acpi_bus_get_device(handle, &device)) {
 950                         result = acpi_processor_device_add(handle, &device);
 951                         if (result)
 952                                 printk(KERN_ERR PREFIX
 953                                             "Unable to add the device\n");
 954                         break;
 955                 }
 956
 957                 pr = acpi_driver_data(device);
 958                 if (!pr) {
 959                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 960                         break;
 961                 }
 962
 963                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
 964                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 965                         break;
 966                 }
 967
 968                 result = acpi_processor_start(device);
 969                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
 970                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 971                 } else {
 972                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 973                                     acpi_device_bid(device));
 974                 }
 975                 break;
 976         case ACPI_NOTIFY_EJECT_REQUEST:
 977                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 978                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 979
 980                 if (acpi_bus_get_device(handle, &device)) {
 981                         printk(KERN_ERR PREFIX
 982                                     "Device don't exist, dropping EJECT\n");
 983                         break;
 984                 }
 985                 pr = acpi_driver_data(device);
 986                 if (!pr) {
 987                         printk(KERN_ERR PREFIX
 988                                     "Driver data is NULL, dropping EJECT\n");
 989                         return;
 990                 }
 991
 992                 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
 993                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 994                 break;
 995         default:
 996                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 997                                   "Unsupported event [0x%x]\n", event));
 998                 break;
 999         }
1000
1001         return;
1002 }
1003
1004 static acpi_status
1005 processor_walk_namespace_cb(acpi_handle handle,
1006                             u32 lvl, void *context, void **rv)
1007 {
1008         acpi_status status;
1009         int *action = context;
1010         acpi_object_type type = 0;
1011
1012         status = acpi_get_type(handle, &type);
1013         if (ACPI_FAILURE(status))
1014                 return (AE_OK);
1015
1016         if (type != ACPI_TYPE_PROCESSOR)
1017                 return (AE_OK);
1018
1019         switch (*action) {
1020         case INSTALL_NOTIFY_HANDLER:
1021                 acpi_install_notify_handler(handle,
1022                                             ACPI_SYSTEM_NOTIFY,
1023                                             acpi_processor_hotplug_notify,
1024                                             NULL);
1025                 break;
1026         case UNINSTALL_NOTIFY_HANDLER:
1027                 acpi_remove_notify_handler(handle,
1028                                            ACPI_SYSTEM_NOTIFY,
1029                                            acpi_processor_hotplug_notify);
1030                 break;
1031         default:
1032                 break;
1033         }
1034
1035         return (AE_OK);
1036 }
1037
1038 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1039 {
1040
1041         if (!is_processor_present(handle)) {
1042                 return AE_ERROR;
1043         }
1044
1045         if (acpi_map_lsapic(handle, p_cpu))
1046                 return AE_ERROR;
1047
1048         if (arch_register_cpu(*p_cpu)) {
1049                 acpi_unmap_lsapic(*p_cpu);
1050                 return AE_ERROR;
1051         }
1052
1053         return AE_OK;
1054 }
1055
1056 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1057 {
1058         if (cpu_online(pr->id))
1059                 cpu_down(pr->id);
1060
1061         arch_unregister_cpu(pr->id);
1062         acpi_unmap_lsapic(pr->id);
1063         return (0);
1064 }
1065 #else
1066 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1067 {
1068         return AE_ERROR;
1069 }
1070 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1071 {
1072         return (-EINVAL);
1073 }
1074 #endif
1075
1076 static
1077 void acpi_processor_install_hotplug_notify(void)
1078 {
1079 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1080         int action = INSTALL_NOTIFY_HANDLER;
1081         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1082                             ACPI_ROOT_OBJECT,
1083                             ACPI_UINT32_MAX,
1084                             processor_walk_namespace_cb, &action, NULL);
1085 #endif
1086         register_hotcpu_notifier(&acpi_cpu_notifier);
1087 }
1088
1089 static
1090 void acpi_processor_uninstall_hotplug_notify(void)
1091 {
1092 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1093         int action = UNINSTALL_NOTIFY_HANDLER;
1094         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1095                             ACPI_ROOT_OBJECT,
1096                             ACPI_UINT32_MAX,
1097                             processor_walk_namespace_cb, &action, NULL);
1098 #endif
1099         unregister_hotcpu_notifier(&acpi_cpu_notifier);
1100 }
1101
1102 /*
1103  * We keep the driver loaded even when ACPI is not running.
1104  * This is needed for the powernow-k8 driver, that works even without
1105  * ACPI, but needs symbols from this driver
1106  */
1107
1108 static int __init acpi_processor_init(void)
1109 {
1110         int result = 0;
1111
1112         memset(&errata, 0, sizeof(errata));
1113
1114 #ifdef CONFIG_SMP
1115         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1116                                 (struct acpi_table_header **)&madt)))
1117                 madt = NULL;
1118 #endif
1119
1120         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1121         if (!acpi_processor_dir)
1122                 return -ENOMEM;
1123         acpi_processor_dir->owner = THIS_MODULE;
1124
1125         /*
1126          * Check whether the system is DMI table. If yes, OSPM
1127          * should not use mwait for CPU-states.
1128          */
1129         dmi_check_system(processor_idle_dmi_table);
1130         result = cpuidle_register_driver(&acpi_idle_driver);
1131         if (result < 0)
1132                 goto out_proc;
1133
1134         result = acpi_bus_register_driver(&acpi_processor_driver);
1135         if (result < 0)
1136                 goto out_cpuidle;
1137
1138         acpi_processor_install_hotplug_notify();
1139
1140         acpi_thermal_cpufreq_init();
1141
1142         acpi_processor_ppc_init();
1143
1144         acpi_processor_throttling_init();
1145
1146         return 0;
1147
1148 out_cpuidle:
1149         cpuidle_unregister_driver(&acpi_idle_driver);
1150
1151 out_proc:
1152         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1153
1154         return result;
1155 }
1156
1157 static void __exit acpi_processor_exit(void)
1158 {
1159         acpi_processor_ppc_exit();
1160
1161         acpi_thermal_cpufreq_exit();
1162
1163         acpi_processor_uninstall_hotplug_notify();
1164
1165         acpi_bus_unregister_driver(&acpi_processor_driver);
1166
1167         cpuidle_unregister_driver(&acpi_idle_driver);
1168
1169         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1170
1171         return;
1172 }
1173
1174 module_init(acpi_processor_init);
1175 module_exit(acpi_processor_exit);
1176
1177 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1178
1179 MODULE_ALIAS("processor");