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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
  48 #include <asm/io.h>
  49 #include <asm/system.h>
  50 #include <asm/cpu.h>
  51 #include <asm/delay.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/processor.h>
  54 #include <asm/smp.h>
  55 #include <asm/acpi.h>
  56
  57 #include <acpi/acpi_bus.h>
  58 #include <acpi/acpi_drivers.h>
  59 #include <acpi/processor.h>
  60
  61 #define ACPI_PROCESSOR_COMPONENT        0x01000000
  62 #define ACPI_PROCESSOR_CLASS            "processor"
  63 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  64 #define ACPI_PROCESSOR_FILE_INFO        "info"
  65 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  66 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  68 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  69
  70 #define ACPI_PROCESSOR_LIMIT_USER       0
  71 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  72
  73 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  74 ACPI_MODULE_NAME("processor_core");
  75
  76 MODULE_AUTHOR("Paul Diefenbaugh");
  77 MODULE_DESCRIPTION("ACPI Processor Driver");
  78 MODULE_LICENSE("GPL");
  79
  80 static int acpi_processor_add(struct acpi_device *device);
  81 static int acpi_processor_start(struct acpi_device *device);
  82 static int acpi_processor_remove(struct acpi_device *device, int type);
  83 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  84 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  85 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  86 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  87
  88 static struct acpi_driver acpi_processor_driver = {
  89         .name = "processor",
  90         .class = ACPI_PROCESSOR_CLASS,
  91         .ids = ACPI_PROCESSOR_HID,
  92         .ops = {
  93                 .add = acpi_processor_add,
  94                 .remove = acpi_processor_remove,
  95                 .start = acpi_processor_start,
  96                 },
  97 };
  98
  99 #define INSTALL_NOTIFY_HANDLER          1
 100 #define UNINSTALL_NOTIFY_HANDLER        2
 101
 102 static const struct file_operations acpi_processor_info_fops = {
 103         .open = acpi_processor_info_open_fs,
 104         .read = seq_read,
 105         .llseek = seq_lseek,
 106         .release = single_release,
 107 };
 108
 109 struct acpi_processor *processors[NR_CPUS];
 110 struct acpi_processor_errata errata __read_mostly;
 111
 112 /* --------------------------------------------------------------------------
 113                                 Errata Handling
 114    -------------------------------------------------------------------------- */
 115
 116 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 117 {
 118         u8 value1 = 0;
 119         u8 value2 = 0;
 120
 121
 122         if (!dev)
 123                 return -EINVAL;
 124
 125         /*
 126          * Note that 'dev' references the PIIX4 ACPI Controller.
 127          */
 128
 129         switch (dev->revision) {
 130         case 0:
 131                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 132                 break;
 133         case 1:
 134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 135                 break;
 136         case 2:
 137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 138                 break;
 139         case 3:
 140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 141                 break;
 142         default:
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 144                 break;
 145         }
 146
 147         switch (dev->revision) {
 148
 149         case 0:         /* PIIX4 A-step */
 150         case 1:         /* PIIX4 B-step */
 151                 /*
 152                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 153                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 154                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 155                  * 2002 PIIX4 specification update.  Applies to only older
 156                  * PIIX4 models.
 157                  */
 158                 errata.piix4.throttle = 1;
 159
 160         case 2:         /* PIIX4E */
 161         case 3:         /* PIIX4M */
 162                 /*
 163                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 164                  * Livelock") from the January 2002 PIIX4 specification update.
 165                  * Applies to all PIIX4 models.
 166                  */
 167
 168                 /*
 169                  * BM-IDE
 170                  * ------
 171                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 172                  * Status register address.  We'll use this later to read
 173                  * each IDE controller's DMA status to make sure we catch all
 174                  * DMA activity.
 175                  */
 176                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 177                                      PCI_DEVICE_ID_INTEL_82371AB,
 178                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 179                 if (dev) {
 180                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 181                         pci_dev_put(dev);
 182                 }
 183
 184                 /*
 185                  * Type-F DMA
 186                  * ----------
 187                  * Find the PIIX4 ISA Controller and read the Motherboard
 188                  * DMA controller's status to see if Type-F (Fast) DMA mode
 189                  * is enabled (bit 7) on either channel.  Note that we'll
 190                  * disable C3 support if this is enabled, as some legacy
 191                  * devices won't operate well if fast DMA is disabled.
 192                  */
 193                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 194                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 195                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 196                 if (dev) {
 197                         pci_read_config_byte(dev, 0x76, &value1);
 198                         pci_read_config_byte(dev, 0x77, &value2);
 199                         if ((value1 & 0x80) || (value2 & 0x80))
 200                                 errata.piix4.fdma = 1;
 201                         pci_dev_put(dev);
 202                 }
 203
 204                 break;
 205         }
 206
 207         if (errata.piix4.bmisx)
 208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 209                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 210         if (errata.piix4.fdma)
 211                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 212                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 213
 214         return 0;
 215 }
 216
 217 static int acpi_processor_errata(struct acpi_processor *pr)
 218 {
 219         int result = 0;
 220         struct pci_dev *dev = NULL;
 221
 222
 223         if (!pr)
 224                 return -EINVAL;
 225
 226         /*
 227          * PIIX4
 228          */
 229         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 230                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 231                              PCI_ANY_ID, NULL);
 232         if (dev) {
 233                 result = acpi_processor_errata_piix4(dev);
 234                 pci_dev_put(dev);
 235         }
 236
 237         return result;
 238 }
 239
 240 /* --------------------------------------------------------------------------
 241                               Common ACPI processor functions
 242    -------------------------------------------------------------------------- */
 243
 244 /*
 245  * _PDC is required for a BIOS-OS handshake for most of the newer
 246  * ACPI processor features.
 247  */
 248 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 249 {
 250         struct acpi_object_list *pdc_in = pr->pdc;
 251         acpi_status status = AE_OK;
 252
 253
 254         if (!pdc_in)
 255                 return status;
 256
 257         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 258
 259         if (ACPI_FAILURE(status))
 260                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 261                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 262
 263         return status;
 264 }
 265
 266 /* --------------------------------------------------------------------------
 267                               FS Interface (/proc)
 268    -------------------------------------------------------------------------- */
 269
 270 static struct proc_dir_entry *acpi_processor_dir = NULL;
 271
 272 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 273 {
 274         struct acpi_processor *pr = seq->private;
 275
 276
 277         if (!pr)
 278                 goto end;
 279
 280         seq_printf(seq, "processor id:            %d\n"
 281                    "acpi id:                 %d\n"
 282                    "bus mastering control:   %s\n"
 283                    "power management:        %s\n"
 284                    "throttling control:      %s\n"
 285                    "limit interface:         %s\n",
 286                    pr->id,
 287                    pr->acpi_id,
 288                    pr->flags.bm_control ? "yes" : "no",
 289                    pr->flags.power ? "yes" : "no",
 290                    pr->flags.throttling ? "yes" : "no",
 291                    pr->flags.limit ? "yes" : "no");
 292
 293       end:
 294         return 0;
 295 }
 296
 297 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 298 {
 299         return single_open(file, acpi_processor_info_seq_show,
 300                            PDE(inode)->data);
 301 }
 302
 303 static int acpi_processor_add_fs(struct acpi_device *device)
 304 {
 305         struct proc_dir_entry *entry = NULL;
 306
 307
 308         if (!acpi_device_dir(device)) {
 309                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 310                                                      acpi_processor_dir);
 311                 if (!acpi_device_dir(device))
 312                         return -ENODEV;
 313         }
 314         acpi_device_dir(device)->owner = THIS_MODULE;
 315
 316         /* 'info' [R] */
 317         entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 318                                   S_IRUGO, acpi_device_dir(device));
 319         if (!entry)
 320                 return -EIO;
 321         else {
 322                 entry->proc_fops = &acpi_processor_info_fops;
 323                 entry->data = acpi_driver_data(device);
 324                 entry->owner = THIS_MODULE;
 325         }
 326
 327         /* 'throttling' [R/W] */
 328         entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 329                                   S_IFREG | S_IRUGO | S_IWUSR,
 330                                   acpi_device_dir(device));
 331         if (!entry)
 332                 return -EIO;
 333         else {
 334                 entry->proc_fops = &acpi_processor_throttling_fops;
 335                 entry->data = acpi_driver_data(device);
 336                 entry->owner = THIS_MODULE;
 337         }
 338
 339         /* 'limit' [R/W] */
 340         entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 341                                   S_IFREG | S_IRUGO | S_IWUSR,
 342                                   acpi_device_dir(device));
 343         if (!entry)
 344                 return -EIO;
 345         else {
 346                 entry->proc_fops = &acpi_processor_limit_fops;
 347                 entry->data = acpi_driver_data(device);
 348                 entry->owner = THIS_MODULE;
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int acpi_processor_remove_fs(struct acpi_device *device)
 355 {
 356
 357         if (acpi_device_dir(device)) {
 358                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 359                                   acpi_device_dir(device));
 360                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 361                                   acpi_device_dir(device));
 362                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 363                                   acpi_device_dir(device));
 364                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 365                 acpi_device_dir(device) = NULL;
 366         }
 367
 368         return 0;
 369 }
 370
 371 /* Use the acpiid in MADT to map cpus in case of SMP */
 372
 373 #ifndef CONFIG_SMP
 374 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
 375 #else
 376
 377 static struct acpi_table_madt *madt;
 378
 379 static int map_lapic_id(struct acpi_subtable_header *entry,
 380                  u32 acpi_id, int *apic_id)
 381 {
 382         struct acpi_madt_local_apic *lapic =
 383                 (struct acpi_madt_local_apic *)entry;
 384         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
 385             lapic->processor_id == acpi_id) {
 386                 *apic_id = lapic->id;
 387                 return 1;
 388         }
 389         return 0;
 390 }
 391
 392 static int map_lsapic_id(struct acpi_subtable_header *entry,
 393                   u32 acpi_id, int *apic_id)
 394 {
 395         struct acpi_madt_local_sapic *lsapic =
 396                 (struct acpi_madt_local_sapic *)entry;
 397         /* Only check enabled APICs*/
 398         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 399                 /* First check against id */
 400                 if (lsapic->processor_id == acpi_id) {
 401                         *apic_id = (lsapic->id << 8) | lsapic->eid;
 402                         return 1;
 403                 /* Check against optional uid */
 404                 } else if (entry->length >= 16 &&
 405                         lsapic->uid == acpi_id) {
 406                         *apic_id = lsapic->uid;
 407                         return 1;
 408                 }
 409         }
 410         return 0;
 411 }
 412
 413 #ifdef CONFIG_IA64
 414 #define arch_cpu_to_apicid      ia64_cpu_to_sapicid
 415 #else
 416 #define arch_cpu_to_apicid      x86_cpu_to_apicid
 417 #endif
 418
 419 static int map_madt_entry(u32 acpi_id)
 420 {
 421         unsigned long madt_end, entry;
 422         int apic_id = -1;
 423
 424         if (!madt)
 425                 return apic_id;
 426
 427         entry = (unsigned long)madt;
 428         madt_end = entry + madt->header.length;
 429
 430         /* Parse all entries looking for a match. */
 431
 432         entry += sizeof(struct acpi_table_madt);
 433         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 434                 struct acpi_subtable_header *header =
 435                         (struct acpi_subtable_header *)entry;
 436                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 437                         if (map_lapic_id(header, acpi_id, &apic_id))
 438                                 break;
 439                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 440                         if (map_lsapic_id(header, acpi_id, &apic_id))
 441                                 break;
 442                 }
 443                 entry += header->length;
 444         }
 445         return apic_id;
 446 }
 447
 448 static int map_mat_entry(acpi_handle handle, u32 acpi_id)
 449 {
 450         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 451         union acpi_object *obj;
 452         struct acpi_subtable_header *header;
 453         int apic_id = -1;
 454
 455         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 456                 goto exit;
 457
 458         if (!buffer.length || !buffer.pointer)
 459                 goto exit;
 460
 461         obj = buffer.pointer;
 462         if (obj->type != ACPI_TYPE_BUFFER ||
 463             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 464                 goto exit;
 465         }
 466
 467         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 468         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 469                 map_lapic_id(header, acpi_id, &apic_id);
 470         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 471                 map_lsapic_id(header, acpi_id, &apic_id);
 472         }
 473
 474 exit:
 475         if (buffer.pointer)
 476                 kfree(buffer.pointer);
 477         return apic_id;
 478 }
 479
 480 static int get_cpu_id(acpi_handle handle, u32 acpi_id)
 481 {
 482         int i;
 483         int apic_id = -1;
 484
 485         apic_id = map_mat_entry(handle, acpi_id);
 486         if (apic_id == -1)
 487                 apic_id = map_madt_entry(acpi_id);
 488         if (apic_id == -1)
 489                 return apic_id;
 490
 491         for (i = 0; i < NR_CPUS; ++i) {
 492                 if (arch_cpu_to_apicid[i] == apic_id)
 493                         return i;
 494         }
 495         return -1;
 496 }
 497 #endif
 498
 499 /* --------------------------------------------------------------------------
 500                                  Driver Interface
 501    -------------------------------------------------------------------------- */
 502
 503 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
 504 {
 505         acpi_status status = 0;
 506         union acpi_object object = { 0 };
 507         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 508         int cpu_index;
 509         static int cpu0_initialized;
 510
 511
 512         if (!pr)
 513                 return -EINVAL;
 514
 515         if (num_online_cpus() > 1)
 516                 errata.smp = TRUE;
 517
 518         acpi_processor_errata(pr);
 519
 520         /*
 521          * Check to see if we have bus mastering arbitration control.  This
 522          * is required for proper C3 usage (to maintain cache coherency).
 523          */
 524         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 525                 pr->flags.bm_control = 1;
 526                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 527                                   "Bus mastering arbitration control present\n"));
 528         } else
 529                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 530                                   "No bus mastering arbitration control\n"));
 531
 532         /* Check if it is a Device with HID and UID */
 533         if (has_uid) {
 534                 unsigned long value;
 535                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 536                                                 NULL, &value);
 537                 if (ACPI_FAILURE(status)) {
 538                         printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
 539                         return -ENODEV;
 540                 }
 541                 pr->acpi_id = value;
 542         } else {
 543                 /*
 544                 * Evalute the processor object.  Note that it is common on SMP to
 545                 * have the first (boot) processor with a valid PBLK address while
 546                 * all others have a NULL address.
 547                 */
 548                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 549                 if (ACPI_FAILURE(status)) {
 550                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 551                         return -ENODEV;
 552                 }
 553
 554                 /*
 555                 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 556                 *      >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
 557                 */
 558                 pr->acpi_id = object.processor.proc_id;
 559         }
 560         cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
 561
 562         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 563         if (!cpu0_initialized && (cpu_index == -1) &&
 564             (num_online_cpus() == 1)) {
 565                 cpu_index = 0;
 566         }
 567
 568         cpu0_initialized = 1;
 569
 570         pr->id = cpu_index;
 571
 572         /*
 573          *  Extra Processor objects may be enumerated on MP systems with
 574          *  less than the max # of CPUs. They should be ignored _iff
 575          *  they are physically not present.
 576          */
 577         if (pr->id == -1) {
 578                 if (ACPI_FAILURE
 579                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 580                         return -ENODEV;
 581                 }
 582         }
 583
 584         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 585                           pr->acpi_id));
 586
 587         if (!object.processor.pblk_address)
 588                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 589         else if (object.processor.pblk_length != 6)
 590                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 591                             object.processor.pblk_length);
 592         else {
 593                 pr->throttling.address = object.processor.pblk_address;
 594                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 595                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 596
 597                 pr->pblk = object.processor.pblk_address;
 598
 599                 /*
 600                  * We don't care about error returns - we just try to mark
 601                  * these reserved so that nobody else is confused into thinking
 602                  * that this region might be unused..
 603                  *
 604                  * (In particular, allocating the IO range for Cardbus)
 605                  */
 606                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 607         }
 608
 609 #ifdef CONFIG_CPU_FREQ
 610         acpi_processor_ppc_has_changed(pr);
 611 #endif
 612         acpi_processor_get_throttling_info(pr);
 613         acpi_processor_get_limit_info(pr);
 614
 615         return 0;
 616 }
 617
 618 static void *processor_device_array[NR_CPUS];
 619
 620 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 621 {
 622         int result = 0;
 623         acpi_status status = AE_OK;
 624         struct acpi_processor *pr;
 625
 626
 627         pr = acpi_driver_data(device);
 628
 629         result = acpi_processor_get_info(pr, device->flags.unique_id);
 630         if (result) {
 631                 /* Processor is physically not present */
 632                 return 0;
 633         }
 634
 635         BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 636
 637         /*
 638          * Buggy BIOS check
 639          * ACPI id of processors can be reported wrongly by the BIOS.
 640          * Don't trust it blindly
 641          */
 642         if (processor_device_array[pr->id] != NULL &&
 643             processor_device_array[pr->id] != device) {
 644                 printk(KERN_WARNING "BIOS reported wrong ACPI id"
 645                         "for the processor\n");
 646                 return -ENODEV;
 647         }
 648         processor_device_array[pr->id] = device;
 649
 650         processors[pr->id] = pr;
 651
 652         result = acpi_processor_add_fs(device);
 653         if (result)
 654                 goto end;
 655
 656         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 657                                              acpi_processor_notify, pr);
 658
 659         /* _PDC call should be done before doing anything else (if reqd.). */
 660         arch_acpi_processor_init_pdc(pr);
 661         acpi_processor_set_pdc(pr);
 662
 663         acpi_processor_power_init(pr, device);
 664
 665         if (pr->flags.throttling) {
 666                 printk(KERN_INFO PREFIX "%s [%s] (supports",
 667                        acpi_device_name(device), acpi_device_bid(device));
 668                 printk(" %d throttling states", pr->throttling.state_count);
 669                 printk(")\n");
 670         }
 671
 672       end:
 673
 674         return result;
 675 }
 676
 677 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 678 {
 679         struct acpi_processor *pr = data;
 680         struct acpi_device *device = NULL;
 681
 682
 683         if (!pr)
 684                 return;
 685
 686         if (acpi_bus_get_device(pr->handle, &device))
 687                 return;
 688
 689         switch (event) {
 690         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 691                 acpi_processor_ppc_has_changed(pr);
 692                 acpi_bus_generate_event(device, event,
 693                                         pr->performance_platform_limit);
 694                 break;
 695         case ACPI_PROCESSOR_NOTIFY_POWER:
 696                 acpi_processor_cst_has_changed(pr);
 697                 acpi_bus_generate_event(device, event, 0);
 698                 break;
 699         default:
 700                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 701                                   "Unsupported event [0x%x]\n", event));
 702                 break;
 703         }
 704
 705         return;
 706 }
 707
 708 static int acpi_processor_add(struct acpi_device *device)
 709 {
 710         struct acpi_processor *pr = NULL;
 711
 712
 713         if (!device)
 714                 return -EINVAL;
 715
 716         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 717         if (!pr)
 718                 return -ENOMEM;
 719
 720         pr->handle = device->handle;
 721         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 722         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 723         acpi_driver_data(device) = pr;
 724
 725         return 0;
 726 }
 727
 728 static int acpi_processor_remove(struct acpi_device *device, int type)
 729 {
 730         acpi_status status = AE_OK;
 731         struct acpi_processor *pr = NULL;
 732
 733
 734         if (!device || !acpi_driver_data(device))
 735                 return -EINVAL;
 736
 737         pr = acpi_driver_data(device);
 738
 739         if (pr->id >= NR_CPUS) {
 740                 kfree(pr);
 741                 return 0;
 742         }
 743
 744         if (type == ACPI_BUS_REMOVAL_EJECT) {
 745                 if (acpi_processor_handle_eject(pr))
 746                         return -EINVAL;
 747         }
 748
 749         acpi_processor_power_exit(pr, device);
 750
 751         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 752                                             acpi_processor_notify);
 753
 754         acpi_processor_remove_fs(device);
 755
 756         processors[pr->id] = NULL;
 757
 758         kfree(pr);
 759
 760         return 0;
 761 }
 762
 763 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 764 /****************************************************************************
 765  *      Acpi processor hotplug support                                      *
 766  ****************************************************************************/
 767
 768 static int is_processor_present(acpi_handle handle);
 769
 770 static int is_processor_present(acpi_handle handle)
 771 {
 772         acpi_status status;
 773         unsigned long sta = 0;
 774
 775
 776         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 777         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) {
 778                 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present"));
 779                 return 0;
 780         }
 781         return 1;
 782 }
 783
 784 static
 785 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 786 {
 787         acpi_handle phandle;
 788         struct acpi_device *pdev;
 789         struct acpi_processor *pr;
 790
 791
 792         if (acpi_get_parent(handle, &phandle)) {
 793                 return -ENODEV;
 794         }
 795
 796         if (acpi_bus_get_device(phandle, &pdev)) {
 797                 return -ENODEV;
 798         }
 799
 800         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 801                 return -ENODEV;
 802         }
 803
 804         acpi_bus_start(*device);
 805
 806         pr = acpi_driver_data(*device);
 807         if (!pr)
 808                 return -ENODEV;
 809
 810         if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
 811                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
 812         }
 813         return 0;
 814 }
 815
 816 static void
 817 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 818 {
 819         struct acpi_processor *pr;
 820         struct acpi_device *device = NULL;
 821         int result;
 822
 823
 824         switch (event) {
 825         case ACPI_NOTIFY_BUS_CHECK:
 826         case ACPI_NOTIFY_DEVICE_CHECK:
 827                 printk("Processor driver received %s event\n",
 828                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 829                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 830
 831                 if (!is_processor_present(handle))
 832                         break;
 833
 834                 if (acpi_bus_get_device(handle, &device)) {
 835                         result = acpi_processor_device_add(handle, &device);
 836                         if (result)
 837                                 printk(KERN_ERR PREFIX
 838                                             "Unable to add the device\n");
 839                         break;
 840                 }
 841
 842                 pr = acpi_driver_data(device);
 843                 if (!pr) {
 844                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
 845                         break;
 846                 }
 847
 848                 if (pr->id >= 0 && (pr->id < NR_CPUS)) {
 849                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 850                         break;
 851                 }
 852
 853                 result = acpi_processor_start(device);
 854                 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
 855                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 856                 } else {
 857                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
 858                                     acpi_device_bid(device));
 859                 }
 860                 break;
 861         case ACPI_NOTIFY_EJECT_REQUEST:
 862                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 863                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 864
 865                 if (acpi_bus_get_device(handle, &device)) {
 866                         printk(KERN_ERR PREFIX
 867                                     "Device don't exist, dropping EJECT\n");
 868                         break;
 869                 }
 870                 pr = acpi_driver_data(device);
 871                 if (!pr) {
 872                         printk(KERN_ERR PREFIX
 873                                     "Driver data is NULL, dropping EJECT\n");
 874                         return;
 875                 }
 876
 877                 if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
 878                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 879                 break;
 880         default:
 881                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 882                                   "Unsupported event [0x%x]\n", event));
 883                 break;
 884         }
 885
 886         return;
 887 }
 888
 889 static acpi_status
 890 processor_walk_namespace_cb(acpi_handle handle,
 891                             u32 lvl, void *context, void **rv)
 892 {
 893         acpi_status status;
 894         int *action = context;
 895         acpi_object_type type = 0;
 896
 897         status = acpi_get_type(handle, &type);
 898         if (ACPI_FAILURE(status))
 899                 return (AE_OK);
 900
 901         if (type != ACPI_TYPE_PROCESSOR)
 902                 return (AE_OK);
 903
 904         switch (*action) {
 905         case INSTALL_NOTIFY_HANDLER:
 906                 acpi_install_notify_handler(handle,
 907                                             ACPI_SYSTEM_NOTIFY,
 908                                             acpi_processor_hotplug_notify,
 909                                             NULL);
 910                 break;
 911         case UNINSTALL_NOTIFY_HANDLER:
 912                 acpi_remove_notify_handler(handle,
 913                                            ACPI_SYSTEM_NOTIFY,
 914                                            acpi_processor_hotplug_notify);
 915                 break;
 916         default:
 917                 break;
 918         }
 919
 920         return (AE_OK);
 921 }
 922
 923 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 924 {
 925
 926         if (!is_processor_present(handle)) {
 927                 return AE_ERROR;
 928         }
 929
 930         if (acpi_map_lsapic(handle, p_cpu))
 931                 return AE_ERROR;
 932
 933         if (arch_register_cpu(*p_cpu)) {
 934                 acpi_unmap_lsapic(*p_cpu);
 935                 return AE_ERROR;
 936         }
 937
 938         return AE_OK;
 939 }
 940
 941 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 942 {
 943         if (cpu_online(pr->id)) {
 944                 return (-EINVAL);
 945         }
 946         arch_unregister_cpu(pr->id);
 947         acpi_unmap_lsapic(pr->id);
 948         return (0);
 949 }
 950 #else
 951 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 952 {
 953         return AE_ERROR;
 954 }
 955 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 956 {
 957         return (-EINVAL);
 958 }
 959 #endif
 960
 961 static
 962 void acpi_processor_install_hotplug_notify(void)
 963 {
 964 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 965         int action = INSTALL_NOTIFY_HANDLER;
 966         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 967                             ACPI_ROOT_OBJECT,
 968                             ACPI_UINT32_MAX,
 969                             processor_walk_namespace_cb, &action, NULL);
 970 #endif
 971 }
 972
 973 static
 974 void acpi_processor_uninstall_hotplug_notify(void)
 975 {
 976 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 977         int action = UNINSTALL_NOTIFY_HANDLER;
 978         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 979                             ACPI_ROOT_OBJECT,
 980                             ACPI_UINT32_MAX,
 981                             processor_walk_namespace_cb, &action, NULL);
 982 #endif
 983 }
 984
 985 /*
 986  * We keep the driver loaded even when ACPI is not running.
 987  * This is needed for the powernow-k8 driver, that works even without
 988  * ACPI, but needs symbols from this driver
 989  */
 990
 991 static int __init acpi_processor_init(void)
 992 {
 993         int result = 0;
 994
 995
 996         memset(&processors, 0, sizeof(processors));
 997         memset(&errata, 0, sizeof(errata));
 998
 999 #ifdef CONFIG_SMP
1000         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1001                                 (struct acpi_table_header **)&madt)))
1002                 madt = NULL;
1003 #endif
1004
1005         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1006         if (!acpi_processor_dir)
1007                 return -ENOMEM;
1008         acpi_processor_dir->owner = THIS_MODULE;
1009
1010         result = acpi_bus_register_driver(&acpi_processor_driver);
1011         if (result < 0) {
1012                 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1013                 return result;
1014         }
1015
1016         acpi_processor_install_hotplug_notify();
1017
1018         acpi_thermal_cpufreq_init();
1019
1020         acpi_processor_ppc_init();
1021
1022         return 0;
1023 }
1024
1025 static void __exit acpi_processor_exit(void)
1026 {
1027
1028         acpi_processor_ppc_exit();
1029
1030         acpi_thermal_cpufreq_exit();
1031
1032         acpi_processor_uninstall_hotplug_notify();
1033
1034         acpi_bus_unregister_driver(&acpi_processor_driver);
1035
1036         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1037
1038         return;
1039 }
1040
1041 module_init(acpi_processor_init);
1042 module_exit(acpi_processor_exit);
1043
1044 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1045
1046 MODULE_ALIAS("processor");