drivers/acpi/processor_driver.c

   1 /*
   2  * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *                      - Added processor hotplug support
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *  TBD:
  28  *      1. Make # power states dynamic.
  29  *      2. Support duty_cycle values that span bit 4.
  30  *      3. Optimize by having scheduler determine business instead of
  31  *         having us try to calculate it here.
  32  *      4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/pci.h>
  40 #include <linux/pm.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/cpu.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/dmi.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/cpuidle.h>
  48 #include <linux/slab.h>
  49
  50 #include <asm/io.h>
  51 #include <asm/system.h>
  52 #include <asm/cpu.h>
  53 #include <asm/delay.h>
  54 #include <asm/uaccess.h>
  55 #include <asm/processor.h>
  56 #include <asm/smp.h>
  57 #include <asm/acpi.h>
  58
  59 #include <acpi/acpi_bus.h>
  60 #include <acpi/acpi_drivers.h>
  61 #include <acpi/processor.h>
  62
  63 #define PREFIX "ACPI: "
  64
  65 #define ACPI_PROCESSOR_CLASS            "processor"
  66 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
  67 #define ACPI_PROCESSOR_FILE_INFO        "info"
  68 #define ACPI_PROCESSOR_FILE_THROTTLING  "throttling"
  69 #define ACPI_PROCESSOR_FILE_LIMIT       "limit"
  70 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  71 #define ACPI_PROCESSOR_NOTIFY_POWER     0x81
  72 #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  73
  74 #define ACPI_PROCESSOR_LIMIT_USER       0
  75 #define ACPI_PROCESSOR_LIMIT_THERMAL    1
  76
  77 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  78 ACPI_MODULE_NAME("processor_driver");
  79
  80 MODULE_AUTHOR("Paul Diefenbaugh");
  81 MODULE_DESCRIPTION("ACPI Processor Driver");
  82 MODULE_LICENSE("GPL");
  83
  84 static int acpi_processor_add(struct acpi_device *device);
  85 static int acpi_processor_remove(struct acpi_device *device, int type);
  86 #ifdef CONFIG_ACPI_PROCFS
  87 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  88 #endif
  89 static void acpi_processor_notify(struct acpi_device *device, u32 event);
  90 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  91 static int acpi_processor_handle_eject(struct acpi_processor *pr);
  92
  93
  94 static const struct acpi_device_id processor_device_ids[] = {
  95         {ACPI_PROCESSOR_OBJECT_HID, 0},
  96         {"ACPI0007", 0},
  97         {"", 0},
  98 };
  99 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
 100
 101 static struct acpi_driver acpi_processor_driver = {
 102         .name = "processor",
 103         .class = ACPI_PROCESSOR_CLASS,
 104         .ids = processor_device_ids,
 105         .ops = {
 106                 .add = acpi_processor_add,
 107                 .remove = acpi_processor_remove,
 108                 .suspend = acpi_processor_suspend,
 109                 .resume = acpi_processor_resume,
 110                 .notify = acpi_processor_notify,
 111                 },
 112 };
 113
 114 #define INSTALL_NOTIFY_HANDLER          1
 115 #define UNINSTALL_NOTIFY_HANDLER        2
 116 #ifdef CONFIG_ACPI_PROCFS
 117 static const struct file_operations acpi_processor_info_fops = {
 118         .owner = THIS_MODULE,
 119         .open = acpi_processor_info_open_fs,
 120         .read = seq_read,
 121         .llseek = seq_lseek,
 122         .release = single_release,
 123 };
 124 #endif
 125
 126 DEFINE_PER_CPU(struct acpi_processor *, processors);
 127 EXPORT_PER_CPU_SYMBOL(processors);
 128
 129 struct acpi_processor_errata errata __read_mostly;
 130
 131 /* --------------------------------------------------------------------------
 132                                 Errata Handling
 133    -------------------------------------------------------------------------- */
 134
 135 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 136 {
 137         u8 value1 = 0;
 138         u8 value2 = 0;
 139
 140
 141         if (!dev)
 142                 return -EINVAL;
 143
 144         /*
 145          * Note that 'dev' references the PIIX4 ACPI Controller.
 146          */
 147
 148         switch (dev->revision) {
 149         case 0:
 150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 151                 break;
 152         case 1:
 153                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 154                 break;
 155         case 2:
 156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 157                 break;
 158         case 3:
 159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 160                 break;
 161         default:
 162                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 163                 break;
 164         }
 165
 166         switch (dev->revision) {
 167
 168         case 0:         /* PIIX4 A-step */
 169         case 1:         /* PIIX4 B-step */
 170                 /*
 171                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 172                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 173                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 174                  * 2002 PIIX4 specification update.  Applies to only older
 175                  * PIIX4 models.
 176                  */
 177                 errata.piix4.throttle = 1;
 178
 179         case 2:         /* PIIX4E */
 180         case 3:         /* PIIX4M */
 181                 /*
 182                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 183                  * Livelock") from the January 2002 PIIX4 specification update.
 184                  * Applies to all PIIX4 models.
 185                  */
 186
 187                 /*
 188                  * BM-IDE
 189                  * ------
 190                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 191                  * Status register address.  We'll use this later to read
 192                  * each IDE controller's DMA status to make sure we catch all
 193                  * DMA activity.
 194                  */
 195                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 196                                      PCI_DEVICE_ID_INTEL_82371AB,
 197                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 198                 if (dev) {
 199                         errata.piix4.bmisx = pci_resource_start(dev, 4);
 200                         pci_dev_put(dev);
 201                 }
 202
 203                 /*
 204                  * Type-F DMA
 205                  * ----------
 206                  * Find the PIIX4 ISA Controller and read the Motherboard
 207                  * DMA controller's status to see if Type-F (Fast) DMA mode
 208                  * is enabled (bit 7) on either channel.  Note that we'll
 209                  * disable C3 support if this is enabled, as some legacy
 210                  * devices won't operate well if fast DMA is disabled.
 211                  */
 212                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 213                                      PCI_DEVICE_ID_INTEL_82371AB_0,
 214                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
 215                 if (dev) {
 216                         pci_read_config_byte(dev, 0x76, &value1);
 217                         pci_read_config_byte(dev, 0x77, &value2);
 218                         if ((value1 & 0x80) || (value2 & 0x80))
 219                                 errata.piix4.fdma = 1;
 220                         pci_dev_put(dev);
 221                 }
 222
 223                 break;
 224         }
 225
 226         if (errata.piix4.bmisx)
 227                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 228                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
 229         if (errata.piix4.fdma)
 230                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 231                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 232
 233         return 0;
 234 }
 235
 236 static int acpi_processor_errata(struct acpi_processor *pr)
 237 {
 238         int result = 0;
 239         struct pci_dev *dev = NULL;
 240
 241
 242         if (!pr)
 243                 return -EINVAL;
 244
 245         /*
 246          * PIIX4
 247          */
 248         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
 249                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
 250                              PCI_ANY_ID, NULL);
 251         if (dev) {
 252                 result = acpi_processor_errata_piix4(dev);
 253                 pci_dev_put(dev);
 254         }
 255
 256         return result;
 257 }
 258
 259 /* --------------------------------------------------------------------------
 260                               FS Interface (/proc)
 261    -------------------------------------------------------------------------- */
 262
 263 #ifdef CONFIG_ACPI_PROCFS
 264 static struct proc_dir_entry *acpi_processor_dir = NULL;
 265
 266 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 267 {
 268         struct acpi_processor *pr = seq->private;
 269
 270
 271         if (!pr)
 272                 goto end;
 273
 274         seq_printf(seq, "processor id:            %d\n"
 275                    "acpi id:                 %d\n"
 276                    "bus mastering control:   %s\n"
 277                    "power management:        %s\n"
 278                    "throttling control:      %s\n"
 279                    "limit interface:         %s\n",
 280                    pr->id,
 281                    pr->acpi_id,
 282                    pr->flags.bm_control ? "yes" : "no",
 283                    pr->flags.power ? "yes" : "no",
 284                    pr->flags.throttling ? "yes" : "no",
 285                    pr->flags.limit ? "yes" : "no");
 286
 287       end:
 288         return 0;
 289 }
 290
 291 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 292 {
 293         return single_open(file, acpi_processor_info_seq_show,
 294                            PDE(inode)->data);
 295 }
 296
 297 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device)
 298 {
 299         struct proc_dir_entry *entry = NULL;
 300
 301
 302         if (!acpi_device_dir(device)) {
 303                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 304                                                      acpi_processor_dir);
 305                 if (!acpi_device_dir(device))
 306                         return -ENODEV;
 307         }
 308
 309         /* 'info' [R] */
 310         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
 311                                  S_IRUGO, acpi_device_dir(device),
 312                                  &acpi_processor_info_fops,
 313                                  acpi_driver_data(device));
 314         if (!entry)
 315                 return -EIO;
 316
 317         /* 'throttling' [R/W] */
 318         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
 319                                  S_IFREG | S_IRUGO | S_IWUSR,
 320                                  acpi_device_dir(device),
 321                                  &acpi_processor_throttling_fops,
 322                                  acpi_driver_data(device));
 323         if (!entry)
 324                 return -EIO;
 325
 326         /* 'limit' [R/W] */
 327         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
 328                                  S_IFREG | S_IRUGO | S_IWUSR,
 329                                  acpi_device_dir(device),
 330                                  &acpi_processor_limit_fops,
 331                                  acpi_driver_data(device));
 332         if (!entry)
 333                 return -EIO;
 334         return 0;
 335 }
 336 static int acpi_processor_remove_fs(struct acpi_device *device)
 337 {
 338
 339         if (acpi_device_dir(device)) {
 340                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
 341                                   acpi_device_dir(device));
 342                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
 343                                   acpi_device_dir(device));
 344                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
 345                                   acpi_device_dir(device));
 346                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 347                 acpi_device_dir(device) = NULL;
 348         }
 349
 350         return 0;
 351 }
 352 #else
 353 static inline int acpi_processor_add_fs(struct acpi_device *device)
 354 {
 355         return 0;
 356 }
 357 static inline int acpi_processor_remove_fs(struct acpi_device *device)
 358 {
 359         return 0;
 360 }
 361 #endif
 362
 363 /* --------------------------------------------------------------------------
 364                                  Driver Interface
 365    -------------------------------------------------------------------------- */
 366
 367 static int acpi_processor_get_info(struct acpi_device *device)
 368 {
 369         acpi_status status = 0;
 370         union acpi_object object = { 0 };
 371         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 372         struct acpi_processor *pr;
 373         int cpu_index, device_declaration = 0;
 374         static int cpu0_initialized;
 375
 376         pr = acpi_driver_data(device);
 377         if (!pr)
 378                 return -EINVAL;
 379
 380         if (num_online_cpus() > 1)
 381                 errata.smp = TRUE;
 382
 383         acpi_processor_errata(pr);
 384
 385         /*
 386          * Check to see if we have bus mastering arbitration control.  This
 387          * is required for proper C3 usage (to maintain cache coherency).
 388          */
 389         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
 390                 pr->flags.bm_control = 1;
 391                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 392                                   "Bus mastering arbitration control present\n"));
 393         } else
 394                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 395                                   "No bus mastering arbitration control\n"));
 396
 397         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
 398                 /* Declared with "Processor" statement; match ProcessorID */
 399                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
 400                 if (ACPI_FAILURE(status)) {
 401                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
 402                         return -ENODEV;
 403                 }
 404
 405                 /*
 406                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
 407                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
 408                  *      arch/xxx/acpi.c
 409                  */
 410                 pr->acpi_id = object.processor.proc_id;
 411         } else {
 412                 /*
 413                  * Declared with "Device" statement; match _UID.
 414                  * Note that we don't handle string _UIDs yet.
 415                  */
 416                 unsigned long long value;
 417                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
 418                                                 NULL, &value);
 419                 if (ACPI_FAILURE(status)) {
 420                         printk(KERN_ERR PREFIX
 421                             "Evaluating processor _UID [%#x]\n", status);
 422                         return -ENODEV;
 423                 }
 424                 device_declaration = 1;
 425                 pr->acpi_id = value;
 426         }
 427         cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
 428
 429         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
 430         if (!cpu0_initialized && (cpu_index == -1) &&
 431             (num_online_cpus() == 1)) {
 432                 cpu_index = 0;
 433         }
 434
 435         cpu0_initialized = 1;
 436
 437         pr->id = cpu_index;
 438
 439         /*
 440          *  Extra Processor objects may be enumerated on MP systems with
 441          *  less than the max # of CPUs. They should be ignored _iff
 442          *  they are physically not present.
 443          */
 444         if (pr->id == -1) {
 445                 if (ACPI_FAILURE
 446                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
 447                         return -ENODEV;
 448                 }
 449         }
 450         /*
 451          * On some boxes several processors use the same processor bus id.
 452          * But they are located in different scope. For example:
 453          * \_SB.SCK0.CPU0
 454          * \_SB.SCK1.CPU0
 455          * Rename the processor device bus id. And the new bus id will be
 456          * generated as the following format:
 457          * CPU+CPU ID.
 458          */
 459         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
 460         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
 461                           pr->acpi_id));
 462
 463         if (!object.processor.pblk_address)
 464                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
 465         else if (object.processor.pblk_length != 6)
 466                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
 467                             object.processor.pblk_length);
 468         else {
 469                 pr->throttling.address = object.processor.pblk_address;
 470                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
 471                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 472
 473                 pr->pblk = object.processor.pblk_address;
 474
 475                 /*
 476                  * We don't care about error returns - we just try to mark
 477                  * these reserved so that nobody else is confused into thinking
 478                  * that this region might be unused..
 479                  *
 480                  * (In particular, allocating the IO range for Cardbus)
 481                  */
 482                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
 483         }
 484
 485         /*
 486          * If ACPI describes a slot number for this CPU, we can use it
 487          * ensure we get the right value in the "physical id" field
 488          * of /proc/cpuinfo
 489          */
 490         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
 491         if (ACPI_SUCCESS(status))
 492                 arch_fix_phys_package_id(pr->id, object.integer.value);
 493
 494         return 0;
 495 }
 496
 497 static DEFINE_PER_CPU(void *, processor_device_array);
 498
 499 static void acpi_processor_notify(struct acpi_device *device, u32 event)
 500 {
 501         struct acpi_processor *pr = acpi_driver_data(device);
 502         int saved;
 503
 504         if (!pr)
 505                 return;
 506
 507         switch (event) {
 508         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 509                 saved = pr->performance_platform_limit;
 510                 acpi_processor_ppc_has_changed(pr, 1);
 511                 if (saved == pr->performance_platform_limit)
 512                         break;
 513                 acpi_bus_generate_proc_event(device, event,
 514                                         pr->performance_platform_limit);
 515                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 516                                                   dev_name(&device->dev), event,
 517                                                   pr->performance_platform_limit);
 518                 break;
 519         case ACPI_PROCESSOR_NOTIFY_POWER:
 520                 acpi_processor_cst_has_changed(pr);
 521                 acpi_bus_generate_proc_event(device, event, 0);
 522                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 523                                                   dev_name(&device->dev), event, 0);
 524                 break;
 525         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 526                 acpi_processor_tstate_has_changed(pr);
 527                 acpi_bus_generate_proc_event(device, event, 0);
 528                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 529                                                   dev_name(&device->dev), event, 0);
 530         default:
 531                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 532                                   "Unsupported event [0x%x]\n", event));
 533                 break;
 534         }
 535
 536         return;
 537 }
 538
 539 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
 540                 unsigned long action, void *hcpu)
 541 {
 542         unsigned int cpu = (unsigned long)hcpu;
 543         struct acpi_processor *pr = per_cpu(processors, cpu);
 544
 545         if (action == CPU_ONLINE && pr) {
 546                 acpi_processor_ppc_has_changed(pr, 0);
 547                 acpi_processor_cst_has_changed(pr);
 548                 acpi_processor_tstate_has_changed(pr);
 549         }
 550         return NOTIFY_OK;
 551 }
 552
 553 static struct notifier_block acpi_cpu_notifier =
 554 {
 555             .notifier_call = acpi_cpu_soft_notify,
 556 };
 557
 558 static int __cpuinit acpi_processor_add(struct acpi_device *device)
 559 {
 560         struct acpi_processor *pr = NULL;
 561         int result = 0;
 562         struct sys_device *sysdev;
 563
 564         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 565         if (!pr)
 566                 return -ENOMEM;
 567
 568         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
 569                 kfree(pr);
 570                 return -ENOMEM;
 571         }
 572
 573         pr->handle = device->handle;
 574         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
 575         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
 576         device->driver_data = pr;
 577
 578         result = acpi_processor_get_info(device);
 579         if (result) {
 580                 /* Processor is physically not present */
 581                 return 0;
 582         }
 583
 584         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 585
 586         /*
 587          * Buggy BIOS check
 588          * ACPI id of processors can be reported wrongly by the BIOS.
 589          * Don't trust it blindly
 590          */
 591         if (per_cpu(processor_device_array, pr->id) != NULL &&
 592             per_cpu(processor_device_array, pr->id) != device) {
 593                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
 594                         "for the processor\n");
 595                 result = -ENODEV;
 596                 goto err_free_cpumask;
 597         }
 598         per_cpu(processor_device_array, pr->id) = device;
 599
 600         per_cpu(processors, pr->id) = pr;
 601
 602         result = acpi_processor_add_fs(device);
 603         if (result)
 604                 goto err_free_cpumask;
 605
 606         sysdev = get_cpu_sysdev(pr->id);
 607         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
 608                 result = -EFAULT;
 609                 goto err_remove_fs;
 610         }
 611
 612 #ifdef CONFIG_CPU_FREQ
 613         acpi_processor_ppc_has_changed(pr, 0);
 614 #endif
 615         acpi_processor_get_throttling_info(pr);
 616         acpi_processor_get_limit_info(pr);
 617
 618
 619         acpi_processor_power_init(pr, device);
 620
 621         pr->cdev = thermal_cooling_device_register("Processor", device,
 622                                                 &processor_cooling_ops);
 623         if (IS_ERR(pr->cdev)) {
 624                 result = PTR_ERR(pr->cdev);
 625                 goto err_power_exit;
 626         }
 627
 628         dev_dbg(&device->dev, "registered as cooling_device%d\n",
 629                  pr->cdev->id);
 630
 631         result = sysfs_create_link(&device->dev.kobj,
 632                                    &pr->cdev->device.kobj,
 633                                    "thermal_cooling");
 634         if (result) {
 635                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 636                 goto err_thermal_unregister;
 637         }
 638         result = sysfs_create_link(&pr->cdev->device.kobj,
 639                                    &device->dev.kobj,
 640                                    "device");
 641         if (result) {
 642                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 643                 goto err_remove_sysfs;
 644         }
 645
 646         return 0;
 647
 648 err_remove_sysfs:
 649         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 650 err_thermal_unregister:
 651         thermal_cooling_device_unregister(pr->cdev);
 652 err_power_exit:
 653         acpi_processor_power_exit(pr, device);
 654 err_remove_fs:
 655         acpi_processor_remove_fs(device);
 656 err_free_cpumask:
 657         free_cpumask_var(pr->throttling.shared_cpu_map);
 658
 659         return result;
 660 }
 661
 662 static int acpi_processor_remove(struct acpi_device *device, int type)
 663 {
 664         struct acpi_processor *pr = NULL;
 665
 666
 667         if (!device || !acpi_driver_data(device))
 668                 return -EINVAL;
 669
 670         pr = acpi_driver_data(device);
 671
 672         if (pr->id >= nr_cpu_ids)
 673                 goto free;
 674
 675         if (type == ACPI_BUS_REMOVAL_EJECT) {
 676                 if (acpi_processor_handle_eject(pr))
 677                         return -EINVAL;
 678         }
 679
 680         acpi_processor_power_exit(pr, device);
 681
 682         sysfs_remove_link(&device->dev.kobj, "sysdev");
 683
 684         acpi_processor_remove_fs(device);
 685
 686         if (pr->cdev) {
 687                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 688                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
 689                 thermal_cooling_device_unregister(pr->cdev);
 690                 pr->cdev = NULL;
 691         }
 692
 693         per_cpu(processors, pr->id) = NULL;
 694         per_cpu(processor_device_array, pr->id) = NULL;
 695
 696 free:
 697         free_cpumask_var(pr->throttling.shared_cpu_map);
 698         kfree(pr);
 699
 700         return 0;
 701 }
 702
 703 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 704 /****************************************************************************
 705  *      Acpi processor hotplug support                                      *
 706  ****************************************************************************/
 707
 708 static int is_processor_present(acpi_handle handle)
 709 {
 710         acpi_status status;
 711         unsigned long long sta = 0;
 712
 713
 714         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 715
 716         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
 717                 return 1;
 718
 719         /*
 720          * _STA is mandatory for a processor that supports hot plug
 721          */
 722         if (status == AE_NOT_FOUND)
 723                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 724                                 "Processor does not support hot plug\n"));
 725         else
 726                 ACPI_EXCEPTION((AE_INFO, status,
 727                                 "Processor Device is not present"));
 728         return 0;
 729 }
 730
 731 static
 732 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 733 {
 734         acpi_handle phandle;
 735         struct acpi_device *pdev;
 736
 737
 738         if (acpi_get_parent(handle, &phandle)) {
 739                 return -ENODEV;
 740         }
 741
 742         if (acpi_bus_get_device(phandle, &pdev)) {
 743                 return -ENODEV;
 744         }
 745
 746         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
 747                 return -ENODEV;
 748         }
 749
 750         return 0;
 751 }
 752
 753 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
 754                                                 u32 event, void *data)
 755 {
 756         struct acpi_processor *pr;
 757         struct acpi_device *device = NULL;
 758         int result;
 759
 760
 761         switch (event) {
 762         case ACPI_NOTIFY_BUS_CHECK:
 763         case ACPI_NOTIFY_DEVICE_CHECK:
 764                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 765                 "Processor driver received %s event\n",
 766                        (event == ACPI_NOTIFY_BUS_CHECK) ?
 767                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 768
 769                 if (!is_processor_present(handle))
 770                         break;
 771
 772                 if (acpi_bus_get_device(handle, &device)) {
 773                         result = acpi_processor_device_add(handle, &device);
 774                         if (result)
 775                                 printk(KERN_ERR PREFIX
 776                                             "Unable to add the device\n");
 777                         break;
 778                 }
 779                 break;
 780         case ACPI_NOTIFY_EJECT_REQUEST:
 781                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 782                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 783
 784                 if (acpi_bus_get_device(handle, &device)) {
 785                         printk(KERN_ERR PREFIX
 786                                     "Device don't exist, dropping EJECT\n");
 787                         break;
 788                 }
 789                 pr = acpi_driver_data(device);
 790                 if (!pr) {
 791                         printk(KERN_ERR PREFIX
 792                                     "Driver data is NULL, dropping EJECT\n");
 793                         return;
 794                 }
 795                 break;
 796         default:
 797                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 798                                   "Unsupported event [0x%x]\n", event));
 799                 break;
 800         }
 801
 802         return;
 803 }
 804
 805 static acpi_status
 806 processor_walk_namespace_cb(acpi_handle handle,
 807                             u32 lvl, void *context, void **rv)
 808 {
 809         acpi_status status;
 810         int *action = context;
 811         acpi_object_type type = 0;
 812
 813         status = acpi_get_type(handle, &type);
 814         if (ACPI_FAILURE(status))
 815                 return (AE_OK);
 816
 817         if (type != ACPI_TYPE_PROCESSOR)
 818                 return (AE_OK);
 819
 820         switch (*action) {
 821         case INSTALL_NOTIFY_HANDLER:
 822                 acpi_install_notify_handler(handle,
 823                                             ACPI_SYSTEM_NOTIFY,
 824                                             acpi_processor_hotplug_notify,
 825                                             NULL);
 826                 break;
 827         case UNINSTALL_NOTIFY_HANDLER:
 828                 acpi_remove_notify_handler(handle,
 829                                            ACPI_SYSTEM_NOTIFY,
 830                                            acpi_processor_hotplug_notify);
 831                 break;
 832         default:
 833                 break;
 834         }
 835
 836         return (AE_OK);
 837 }
 838
 839 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 840 {
 841
 842         if (!is_processor_present(handle)) {
 843                 return AE_ERROR;
 844         }
 845
 846         if (acpi_map_lsapic(handle, p_cpu))
 847                 return AE_ERROR;
 848
 849         if (arch_register_cpu(*p_cpu)) {
 850                 acpi_unmap_lsapic(*p_cpu);
 851                 return AE_ERROR;
 852         }
 853
 854         return AE_OK;
 855 }
 856
 857 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 858 {
 859         if (cpu_online(pr->id))
 860                 cpu_down(pr->id);
 861
 862         arch_unregister_cpu(pr->id);
 863         acpi_unmap_lsapic(pr->id);
 864         return (0);
 865 }
 866 #else
 867 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
 868 {
 869         return AE_ERROR;
 870 }
 871 static int acpi_processor_handle_eject(struct acpi_processor *pr)
 872 {
 873         return (-EINVAL);
 874 }
 875 #endif
 876
 877 static
 878 void acpi_processor_install_hotplug_notify(void)
 879 {
 880 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 881         int action = INSTALL_NOTIFY_HANDLER;
 882         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 883                             ACPI_ROOT_OBJECT,
 884                             ACPI_UINT32_MAX,
 885                             processor_walk_namespace_cb, NULL, &action, NULL);
 886 #endif
 887         register_hotcpu_notifier(&acpi_cpu_notifier);
 888 }
 889
 890 static
 891 void acpi_processor_uninstall_hotplug_notify(void)
 892 {
 893 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 894         int action = UNINSTALL_NOTIFY_HANDLER;
 895         acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
 896                             ACPI_ROOT_OBJECT,
 897                             ACPI_UINT32_MAX,
 898                             processor_walk_namespace_cb, NULL, &action, NULL);
 899 #endif
 900         unregister_hotcpu_notifier(&acpi_cpu_notifier);
 901 }
 902
 903 /*
 904  * We keep the driver loaded even when ACPI is not running.
 905  * This is needed for the powernow-k8 driver, that works even without
 906  * ACPI, but needs symbols from this driver
 907  */
 908
 909 static int __init acpi_processor_init(void)
 910 {
 911         int result = 0;
 912
 913         if (acpi_disabled)
 914                 return 0;
 915
 916         memset(&errata, 0, sizeof(errata));
 917
 918 #ifdef CONFIG_ACPI_PROCFS
 919         acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 920         if (!acpi_processor_dir)
 921                 return -ENOMEM;
 922 #endif
 923         result = cpuidle_register_driver(&acpi_idle_driver);
 924         if (result < 0)
 925                 goto out_proc;
 926
 927         result = acpi_bus_register_driver(&acpi_processor_driver);
 928         if (result < 0)
 929                 goto out_cpuidle;
 930
 931         acpi_processor_install_hotplug_notify();
 932
 933         acpi_thermal_cpufreq_init();
 934
 935         acpi_processor_ppc_init();
 936
 937         acpi_processor_throttling_init();
 938
 939         return 0;
 940
 941 out_cpuidle:
 942         cpuidle_unregister_driver(&acpi_idle_driver);
 943
 944 out_proc:
 945 #ifdef CONFIG_ACPI_PROCFS
 946         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 947 #endif
 948
 949         return result;
 950 }
 951
 952 static void __exit acpi_processor_exit(void)
 953 {
 954         if (acpi_disabled)
 955                 return;
 956
 957         acpi_processor_ppc_exit();
 958
 959         acpi_thermal_cpufreq_exit();
 960
 961         acpi_processor_uninstall_hotplug_notify();
 962
 963         acpi_bus_unregister_driver(&acpi_processor_driver);
 964
 965         cpuidle_unregister_driver(&acpi_idle_driver);
 966
 967 #ifdef CONFIG_ACPI_PROCFS
 968         remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 969 #endif
 970
 971         return;
 972 }
 973
 974 module_init(acpi_processor_init);
 975 module_exit(acpi_processor_exit);
 976
 977 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
 978
 979 MODULE_ALIAS("processor");