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