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