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