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/dmi.h> 44 #include <linux/moduleparam.h> 45 #include <linux/cpuidle.h> 46 #include <linux/slab.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 PREFIX "ACPI: " 62 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_driver"); 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_remove(struct acpi_device *device, int type); 84 static void acpi_processor_notify(struct acpi_device *device, u32 event); 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 89 static const struct acpi_device_id processor_device_ids[] = { 90 {ACPI_PROCESSOR_OBJECT_HID, 0}, 91 {"ACPI0007", 0}, 92 {"", 0}, 93 }; 94 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 95 96 static struct acpi_driver acpi_processor_driver = { 97 .name = "processor", 98 .class = ACPI_PROCESSOR_CLASS, 99 .ids = processor_device_ids, 100 .ops = { 101 .add = acpi_processor_add, 102 .remove = acpi_processor_remove, 103 .suspend = acpi_processor_suspend, 104 .resume = acpi_processor_resume, 105 .notify = acpi_processor_notify, 106 }, 107 }; 108 109 #define INSTALL_NOTIFY_HANDLER 1 110 #define UNINSTALL_NOTIFY_HANDLER 2 111 112 DEFINE_PER_CPU(struct acpi_processor *, processors); 113 EXPORT_PER_CPU_SYMBOL(processors); 114 115 struct acpi_processor_errata errata __read_mostly; 116 117 /* -------------------------------------------------------------------------- 118 Errata Handling 119 -------------------------------------------------------------------------- */ 120 121 static int acpi_processor_errata_piix4(struct pci_dev *dev) 122 { 123 u8 value1 = 0; 124 u8 value2 = 0; 125 126 127 if (!dev) 128 return -EINVAL; 129 130 /* 131 * Note that 'dev' references the PIIX4 ACPI Controller. 132 */ 133 134 switch (dev->revision) { 135 case 0: 136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 137 break; 138 case 1: 139 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 140 break; 141 case 2: 142 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 143 break; 144 case 3: 145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 146 break; 147 default: 148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 149 break; 150 } 151 152 switch (dev->revision) { 153 154 case 0: /* PIIX4 A-step */ 155 case 1: /* PIIX4 B-step */ 156 /* 157 * See specification changes #13 ("Manual Throttle Duty Cycle") 158 * and #14 ("Enabling and Disabling Manual Throttle"), plus 159 * erratum #5 ("STPCLK# Deassertion Time") from the January 160 * 2002 PIIX4 specification update. Applies to only older 161 * PIIX4 models. 162 */ 163 errata.piix4.throttle = 1; 164 165 case 2: /* PIIX4E */ 166 case 3: /* PIIX4M */ 167 /* 168 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 169 * Livelock") from the January 2002 PIIX4 specification update. 170 * Applies to all PIIX4 models. 171 */ 172 173 /* 174 * BM-IDE 175 * ------ 176 * Find the PIIX4 IDE Controller and get the Bus Master IDE 177 * Status register address. We'll use this later to read 178 * each IDE controller's DMA status to make sure we catch all 179 * DMA activity. 180 */ 181 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 182 PCI_DEVICE_ID_INTEL_82371AB, 183 PCI_ANY_ID, PCI_ANY_ID, NULL); 184 if (dev) { 185 errata.piix4.bmisx = pci_resource_start(dev, 4); 186 pci_dev_put(dev); 187 } 188 189 /* 190 * Type-F DMA 191 * ---------- 192 * Find the PIIX4 ISA Controller and read the Motherboard 193 * DMA controller's status to see if Type-F (Fast) DMA mode 194 * is enabled (bit 7) on either channel. Note that we'll 195 * disable C3 support if this is enabled, as some legacy 196 * devices won't operate well if fast DMA is disabled. 197 */ 198 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 199 PCI_DEVICE_ID_INTEL_82371AB_0, 200 PCI_ANY_ID, PCI_ANY_ID, NULL); 201 if (dev) { 202 pci_read_config_byte(dev, 0x76, &value1); 203 pci_read_config_byte(dev, 0x77, &value2); 204 if ((value1 & 0x80) || (value2 & 0x80)) 205 errata.piix4.fdma = 1; 206 pci_dev_put(dev); 207 } 208 209 break; 210 } 211 212 if (errata.piix4.bmisx) 213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 214 "Bus master activity detection (BM-IDE) erratum enabled\n")); 215 if (errata.piix4.fdma) 216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 217 "Type-F DMA livelock erratum (C3 disabled)\n")); 218 219 return 0; 220 } 221 222 static int acpi_processor_errata(struct acpi_processor *pr) 223 { 224 int result = 0; 225 struct pci_dev *dev = NULL; 226 227 228 if (!pr) 229 return -EINVAL; 230 231 /* 232 * PIIX4 233 */ 234 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 235 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 236 PCI_ANY_ID, NULL); 237 if (dev) { 238 result = acpi_processor_errata_piix4(dev); 239 pci_dev_put(dev); 240 } 241 242 return result; 243 } 244 245 /* -------------------------------------------------------------------------- 246 Driver Interface 247 -------------------------------------------------------------------------- */ 248 249 static int acpi_processor_get_info(struct acpi_device *device) 250 { 251 acpi_status status = 0; 252 union acpi_object object = { 0 }; 253 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 254 struct acpi_processor *pr; 255 int cpu_index, device_declaration = 0; 256 static int cpu0_initialized; 257 258 pr = acpi_driver_data(device); 259 if (!pr) 260 return -EINVAL; 261 262 if (num_online_cpus() > 1) 263 errata.smp = TRUE; 264 265 acpi_processor_errata(pr); 266 267 /* 268 * Check to see if we have bus mastering arbitration control. This 269 * is required for proper C3 usage (to maintain cache coherency). 270 */ 271 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 272 pr->flags.bm_control = 1; 273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 274 "Bus mastering arbitration control present\n")); 275 } else 276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 277 "No bus mastering arbitration control\n")); 278 279 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 280 /* Declared with "Processor" statement; match ProcessorID */ 281 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 282 if (ACPI_FAILURE(status)) { 283 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 284 return -ENODEV; 285 } 286 287 /* 288 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 289 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 290 * arch/xxx/acpi.c 291 */ 292 pr->acpi_id = object.processor.proc_id; 293 } else { 294 /* 295 * Declared with "Device" statement; match _UID. 296 * Note that we don't handle string _UIDs yet. 297 */ 298 unsigned long long value; 299 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 300 NULL, &value); 301 if (ACPI_FAILURE(status)) { 302 printk(KERN_ERR PREFIX 303 "Evaluating processor _UID [%#x]\n", status); 304 return -ENODEV; 305 } 306 device_declaration = 1; 307 pr->acpi_id = value; 308 } 309 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id); 310 311 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 312 if (!cpu0_initialized && (cpu_index == -1) && 313 (num_online_cpus() == 1)) { 314 cpu_index = 0; 315 } 316 317 cpu0_initialized = 1; 318 319 pr->id = cpu_index; 320 321 /* 322 * Extra Processor objects may be enumerated on MP systems with 323 * less than the max # of CPUs. They should be ignored _iff 324 * they are physically not present. 325 */ 326 if (pr->id == -1) { 327 if (ACPI_FAILURE 328 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 329 return -ENODEV; 330 } 331 } 332 /* 333 * On some boxes several processors use the same processor bus id. 334 * But they are located in different scope. For example: 335 * \_SB.SCK0.CPU0 336 * \_SB.SCK1.CPU0 337 * Rename the processor device bus id. And the new bus id will be 338 * generated as the following format: 339 * CPU+CPU ID. 340 */ 341 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 343 pr->acpi_id)); 344 345 if (!object.processor.pblk_address) 346 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 347 else if (object.processor.pblk_length != 6) 348 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 349 object.processor.pblk_length); 350 else { 351 pr->throttling.address = object.processor.pblk_address; 352 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 353 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 354 355 pr->pblk = object.processor.pblk_address; 356 357 /* 358 * We don't care about error returns - we just try to mark 359 * these reserved so that nobody else is confused into thinking 360 * that this region might be unused.. 361 * 362 * (In particular, allocating the IO range for Cardbus) 363 */ 364 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 365 } 366 367 /* 368 * If ACPI describes a slot number for this CPU, we can use it 369 * ensure we get the right value in the "physical id" field 370 * of /proc/cpuinfo 371 */ 372 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 373 if (ACPI_SUCCESS(status)) 374 arch_fix_phys_package_id(pr->id, object.integer.value); 375 376 return 0; 377 } 378 379 static DEFINE_PER_CPU(void *, processor_device_array); 380 381 static void acpi_processor_notify(struct acpi_device *device, u32 event) 382 { 383 struct acpi_processor *pr = acpi_driver_data(device); 384 int saved; 385 386 if (!pr) 387 return; 388 389 switch (event) { 390 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 391 saved = pr->performance_platform_limit; 392 acpi_processor_ppc_has_changed(pr, 1); 393 if (saved == pr->performance_platform_limit) 394 break; 395 acpi_bus_generate_proc_event(device, event, 396 pr->performance_platform_limit); 397 acpi_bus_generate_netlink_event(device->pnp.device_class, 398 dev_name(&device->dev), event, 399 pr->performance_platform_limit); 400 break; 401 case ACPI_PROCESSOR_NOTIFY_POWER: 402 acpi_processor_cst_has_changed(pr); 403 acpi_bus_generate_proc_event(device, event, 0); 404 acpi_bus_generate_netlink_event(device->pnp.device_class, 405 dev_name(&device->dev), event, 0); 406 break; 407 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 408 acpi_processor_tstate_has_changed(pr); 409 acpi_bus_generate_proc_event(device, event, 0); 410 acpi_bus_generate_netlink_event(device->pnp.device_class, 411 dev_name(&device->dev), event, 0); 412 default: 413 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 414 "Unsupported event [0x%x]\n", event)); 415 break; 416 } 417 418 return; 419 } 420 421 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 422 unsigned long action, void *hcpu) 423 { 424 unsigned int cpu = (unsigned long)hcpu; 425 struct acpi_processor *pr = per_cpu(processors, cpu); 426 427 if (action == CPU_ONLINE && pr) { 428 acpi_processor_ppc_has_changed(pr, 0); 429 acpi_processor_hotplug(pr); 430 acpi_processor_reevaluate_tstate(pr, action); 431 acpi_processor_tstate_has_changed(pr); 432 } 433 if (action == CPU_DEAD && pr) { 434 /* invalidate the flag.throttling after one CPU is offline */ 435 acpi_processor_reevaluate_tstate(pr, action); 436 } 437 return NOTIFY_OK; 438 } 439 440 static struct notifier_block acpi_cpu_notifier = 441 { 442 .notifier_call = acpi_cpu_soft_notify, 443 }; 444 445 static int __cpuinit acpi_processor_add(struct acpi_device *device) 446 { 447 struct acpi_processor *pr = NULL; 448 int result = 0; 449 struct sys_device *sysdev; 450 451 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 452 if (!pr) 453 return -ENOMEM; 454 455 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 456 kfree(pr); 457 return -ENOMEM; 458 } 459 460 pr->handle = device->handle; 461 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 462 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 463 device->driver_data = pr; 464 465 result = acpi_processor_get_info(device); 466 if (result) { 467 /* Processor is physically not present */ 468 return 0; 469 } 470 471 #ifdef CONFIG_SMP 472 if (pr->id >= setup_max_cpus && pr->id != 0) 473 return 0; 474 #endif 475 476 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 477 478 /* 479 * Buggy BIOS check 480 * ACPI id of processors can be reported wrongly by the BIOS. 481 * Don't trust it blindly 482 */ 483 if (per_cpu(processor_device_array, pr->id) != NULL && 484 per_cpu(processor_device_array, pr->id) != device) { 485 printk(KERN_WARNING "BIOS reported wrong ACPI id " 486 "for the processor\n"); 487 result = -ENODEV; 488 goto err_free_cpumask; 489 } 490 per_cpu(processor_device_array, pr->id) = device; 491 492 per_cpu(processors, pr->id) = pr; 493 494 sysdev = get_cpu_sysdev(pr->id); 495 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { 496 result = -EFAULT; 497 goto err_free_cpumask; 498 } 499 500 #ifdef CONFIG_CPU_FREQ 501 acpi_processor_ppc_has_changed(pr, 0); 502 #endif 503 acpi_processor_get_throttling_info(pr); 504 acpi_processor_get_limit_info(pr); 505 506 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) 507 acpi_processor_power_init(pr, device); 508 509 pr->cdev = thermal_cooling_device_register("Processor", device, 510 &processor_cooling_ops); 511 if (IS_ERR(pr->cdev)) { 512 result = PTR_ERR(pr->cdev); 513 goto err_power_exit; 514 } 515 516 dev_dbg(&device->dev, "registered as cooling_device%d\n", 517 pr->cdev->id); 518 519 result = sysfs_create_link(&device->dev.kobj, 520 &pr->cdev->device.kobj, 521 "thermal_cooling"); 522 if (result) { 523 printk(KERN_ERR PREFIX "Create sysfs link\n"); 524 goto err_thermal_unregister; 525 } 526 result = sysfs_create_link(&pr->cdev->device.kobj, 527 &device->dev.kobj, 528 "device"); 529 if (result) { 530 printk(KERN_ERR PREFIX "Create sysfs link\n"); 531 goto err_remove_sysfs; 532 } 533 534 return 0; 535 536 err_remove_sysfs: 537 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 538 err_thermal_unregister: 539 thermal_cooling_device_unregister(pr->cdev); 540 err_power_exit: 541 acpi_processor_power_exit(pr, device); 542 err_free_cpumask: 543 free_cpumask_var(pr->throttling.shared_cpu_map); 544 545 return result; 546 } 547 548 static int acpi_processor_remove(struct acpi_device *device, int type) 549 { 550 struct acpi_processor *pr = NULL; 551 552 553 if (!device || !acpi_driver_data(device)) 554 return -EINVAL; 555 556 pr = acpi_driver_data(device); 557 558 if (pr->id >= nr_cpu_ids) 559 goto free; 560 561 if (type == ACPI_BUS_REMOVAL_EJECT) { 562 if (acpi_processor_handle_eject(pr)) 563 return -EINVAL; 564 } 565 566 acpi_processor_power_exit(pr, device); 567 568 sysfs_remove_link(&device->dev.kobj, "sysdev"); 569 570 if (pr->cdev) { 571 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 572 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 573 thermal_cooling_device_unregister(pr->cdev); 574 pr->cdev = NULL; 575 } 576 577 per_cpu(processors, pr->id) = NULL; 578 per_cpu(processor_device_array, pr->id) = NULL; 579 580 free: 581 free_cpumask_var(pr->throttling.shared_cpu_map); 582 kfree(pr); 583 584 return 0; 585 } 586 587 #ifdef CONFIG_ACPI_HOTPLUG_CPU 588 /**************************************************************************** 589 * Acpi processor hotplug support * 590 ****************************************************************************/ 591 592 static int is_processor_present(acpi_handle handle) 593 { 594 acpi_status status; 595 unsigned long long sta = 0; 596 597 598 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 599 600 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 601 return 1; 602 603 /* 604 * _STA is mandatory for a processor that supports hot plug 605 */ 606 if (status == AE_NOT_FOUND) 607 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 608 "Processor does not support hot plug\n")); 609 else 610 ACPI_EXCEPTION((AE_INFO, status, 611 "Processor Device is not present")); 612 return 0; 613 } 614 615 static 616 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 617 { 618 acpi_handle phandle; 619 struct acpi_device *pdev; 620 621 622 if (acpi_get_parent(handle, &phandle)) { 623 return -ENODEV; 624 } 625 626 if (acpi_bus_get_device(phandle, &pdev)) { 627 return -ENODEV; 628 } 629 630 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 631 return -ENODEV; 632 } 633 634 return 0; 635 } 636 637 static void acpi_processor_hotplug_notify(acpi_handle handle, 638 u32 event, void *data) 639 { 640 struct acpi_processor *pr; 641 struct acpi_device *device = NULL; 642 int result; 643 644 645 switch (event) { 646 case ACPI_NOTIFY_BUS_CHECK: 647 case ACPI_NOTIFY_DEVICE_CHECK: 648 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 649 "Processor driver received %s event\n", 650 (event == ACPI_NOTIFY_BUS_CHECK) ? 651 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 652 653 if (!is_processor_present(handle)) 654 break; 655 656 if (acpi_bus_get_device(handle, &device)) { 657 result = acpi_processor_device_add(handle, &device); 658 if (result) 659 printk(KERN_ERR PREFIX 660 "Unable to add the device\n"); 661 break; 662 } 663 break; 664 case ACPI_NOTIFY_EJECT_REQUEST: 665 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 666 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 667 668 if (acpi_bus_get_device(handle, &device)) { 669 printk(KERN_ERR PREFIX 670 "Device don't exist, dropping EJECT\n"); 671 break; 672 } 673 pr = acpi_driver_data(device); 674 if (!pr) { 675 printk(KERN_ERR PREFIX 676 "Driver data is NULL, dropping EJECT\n"); 677 return; 678 } 679 break; 680 default: 681 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 682 "Unsupported event [0x%x]\n", event)); 683 break; 684 } 685 686 return; 687 } 688 689 static acpi_status 690 processor_walk_namespace_cb(acpi_handle handle, 691 u32 lvl, void *context, void **rv) 692 { 693 acpi_status status; 694 int *action = context; 695 acpi_object_type type = 0; 696 697 status = acpi_get_type(handle, &type); 698 if (ACPI_FAILURE(status)) 699 return (AE_OK); 700 701 if (type != ACPI_TYPE_PROCESSOR) 702 return (AE_OK); 703 704 switch (*action) { 705 case INSTALL_NOTIFY_HANDLER: 706 acpi_install_notify_handler(handle, 707 ACPI_SYSTEM_NOTIFY, 708 acpi_processor_hotplug_notify, 709 NULL); 710 break; 711 case UNINSTALL_NOTIFY_HANDLER: 712 acpi_remove_notify_handler(handle, 713 ACPI_SYSTEM_NOTIFY, 714 acpi_processor_hotplug_notify); 715 break; 716 default: 717 break; 718 } 719 720 return (AE_OK); 721 } 722 723 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 724 { 725 726 if (!is_processor_present(handle)) { 727 return AE_ERROR; 728 } 729 730 if (acpi_map_lsapic(handle, p_cpu)) 731 return AE_ERROR; 732 733 if (arch_register_cpu(*p_cpu)) { 734 acpi_unmap_lsapic(*p_cpu); 735 return AE_ERROR; 736 } 737 738 return AE_OK; 739 } 740 741 static int acpi_processor_handle_eject(struct acpi_processor *pr) 742 { 743 if (cpu_online(pr->id)) 744 cpu_down(pr->id); 745 746 arch_unregister_cpu(pr->id); 747 acpi_unmap_lsapic(pr->id); 748 return (0); 749 } 750 #else 751 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 752 { 753 return AE_ERROR; 754 } 755 static int acpi_processor_handle_eject(struct acpi_processor *pr) 756 { 757 return (-EINVAL); 758 } 759 #endif 760 761 static 762 void acpi_processor_install_hotplug_notify(void) 763 { 764 #ifdef CONFIG_ACPI_HOTPLUG_CPU 765 int action = INSTALL_NOTIFY_HANDLER; 766 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 767 ACPI_ROOT_OBJECT, 768 ACPI_UINT32_MAX, 769 processor_walk_namespace_cb, NULL, &action, NULL); 770 #endif 771 register_hotcpu_notifier(&acpi_cpu_notifier); 772 } 773 774 static 775 void acpi_processor_uninstall_hotplug_notify(void) 776 { 777 #ifdef CONFIG_ACPI_HOTPLUG_CPU 778 int action = UNINSTALL_NOTIFY_HANDLER; 779 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 780 ACPI_ROOT_OBJECT, 781 ACPI_UINT32_MAX, 782 processor_walk_namespace_cb, NULL, &action, NULL); 783 #endif 784 unregister_hotcpu_notifier(&acpi_cpu_notifier); 785 } 786 787 /* 788 * We keep the driver loaded even when ACPI is not running. 789 * This is needed for the powernow-k8 driver, that works even without 790 * ACPI, but needs symbols from this driver 791 */ 792 793 static int __init acpi_processor_init(void) 794 { 795 int result = 0; 796 797 if (acpi_disabled) 798 return 0; 799 800 memset(&errata, 0, sizeof(errata)); 801 802 result = acpi_bus_register_driver(&acpi_processor_driver); 803 if (result < 0) 804 return result; 805 806 acpi_processor_install_hotplug_notify(); 807 808 acpi_thermal_cpufreq_init(); 809 810 acpi_processor_ppc_init(); 811 812 acpi_processor_throttling_init(); 813 814 return 0; 815 } 816 817 static void __exit acpi_processor_exit(void) 818 { 819 if (acpi_disabled) 820 return; 821 822 acpi_processor_ppc_exit(); 823 824 acpi_thermal_cpufreq_exit(); 825 826 acpi_processor_uninstall_hotplug_notify(); 827 828 acpi_bus_unregister_driver(&acpi_processor_driver); 829 830 cpuidle_unregister_driver(&acpi_idle_driver); 831 832 return; 833 } 834 835 module_init(acpi_processor_init); 836 module_exit(acpi_processor_exit); 837 838 MODULE_ALIAS("processor"); 839