1 /* 2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> 7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 8 * - Added processor hotplug support 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or (at 15 * your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License along 23 * with this program; if not, write to the Free Software Foundation, Inc., 24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 * TBD: 28 * 1. Make # power states dynamic. 29 * 2. Support duty_cycle values that span bit 4. 30 * 3. Optimize by having scheduler determine business instead of 31 * having us try to calculate it here. 32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this. 33 */ 34 35 #include <linux/kernel.h> 36 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/types.h> 39 #include <linux/pci.h> 40 #include <linux/pm.h> 41 #include <linux/cpufreq.h> 42 #include <linux/cpu.h> 43 #include <linux/proc_fs.h> 44 #include <linux/seq_file.h> 45 #include <linux/dmi.h> 46 #include <linux/moduleparam.h> 47 #include <linux/cpuidle.h> 48 #include <linux/slab.h> 49 50 #include <asm/io.h> 51 #include <asm/system.h> 52 #include <asm/cpu.h> 53 #include <asm/delay.h> 54 #include <asm/uaccess.h> 55 #include <asm/processor.h> 56 #include <asm/smp.h> 57 #include <asm/acpi.h> 58 59 #include <acpi/acpi_bus.h> 60 #include <acpi/acpi_drivers.h> 61 #include <acpi/processor.h> 62 63 #define PREFIX "ACPI: " 64 65 #define ACPI_PROCESSOR_CLASS "processor" 66 #define ACPI_PROCESSOR_DEVICE_NAME "Processor" 67 #define ACPI_PROCESSOR_FILE_INFO "info" 68 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 69 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 70 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 71 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 72 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 73 74 #define ACPI_PROCESSOR_LIMIT_USER 0 75 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 76 77 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 78 ACPI_MODULE_NAME("processor_driver"); 79 80 MODULE_AUTHOR("Paul Diefenbaugh"); 81 MODULE_DESCRIPTION("ACPI Processor Driver"); 82 MODULE_LICENSE("GPL"); 83 84 static int acpi_processor_add(struct acpi_device *device); 85 static int acpi_processor_remove(struct acpi_device *device, int type); 86 #ifdef CONFIG_ACPI_PROCFS 87 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 88 #endif 89 static void acpi_processor_notify(struct acpi_device *device, u32 event); 90 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 91 static int acpi_processor_handle_eject(struct acpi_processor *pr); 92 93 94 static const struct acpi_device_id processor_device_ids[] = { 95 {ACPI_PROCESSOR_OBJECT_HID, 0}, 96 {"ACPI0007", 0}, 97 {"", 0}, 98 }; 99 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 100 101 static struct acpi_driver acpi_processor_driver = { 102 .name = "processor", 103 .class = ACPI_PROCESSOR_CLASS, 104 .ids = processor_device_ids, 105 .ops = { 106 .add = acpi_processor_add, 107 .remove = acpi_processor_remove, 108 .suspend = acpi_processor_suspend, 109 .resume = acpi_processor_resume, 110 .notify = acpi_processor_notify, 111 }, 112 }; 113 114 #define INSTALL_NOTIFY_HANDLER 1 115 #define UNINSTALL_NOTIFY_HANDLER 2 116 #ifdef CONFIG_ACPI_PROCFS 117 static const struct file_operations acpi_processor_info_fops = { 118 .owner = THIS_MODULE, 119 .open = acpi_processor_info_open_fs, 120 .read = seq_read, 121 .llseek = seq_lseek, 122 .release = single_release, 123 }; 124 #endif 125 126 DEFINE_PER_CPU(struct acpi_processor *, processors); 127 EXPORT_PER_CPU_SYMBOL(processors); 128 129 struct acpi_processor_errata errata __read_mostly; 130 131 /* -------------------------------------------------------------------------- 132 Errata Handling 133 -------------------------------------------------------------------------- */ 134 135 static int acpi_processor_errata_piix4(struct pci_dev *dev) 136 { 137 u8 value1 = 0; 138 u8 value2 = 0; 139 140 141 if (!dev) 142 return -EINVAL; 143 144 /* 145 * Note that 'dev' references the PIIX4 ACPI Controller. 146 */ 147 148 switch (dev->revision) { 149 case 0: 150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 151 break; 152 case 1: 153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 154 break; 155 case 2: 156 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 157 break; 158 case 3: 159 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 160 break; 161 default: 162 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 163 break; 164 } 165 166 switch (dev->revision) { 167 168 case 0: /* PIIX4 A-step */ 169 case 1: /* PIIX4 B-step */ 170 /* 171 * See specification changes #13 ("Manual Throttle Duty Cycle") 172 * and #14 ("Enabling and Disabling Manual Throttle"), plus 173 * erratum #5 ("STPCLK# Deassertion Time") from the January 174 * 2002 PIIX4 specification update. Applies to only older 175 * PIIX4 models. 176 */ 177 errata.piix4.throttle = 1; 178 179 case 2: /* PIIX4E */ 180 case 3: /* PIIX4M */ 181 /* 182 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 183 * Livelock") from the January 2002 PIIX4 specification update. 184 * Applies to all PIIX4 models. 185 */ 186 187 /* 188 * BM-IDE 189 * ------ 190 * Find the PIIX4 IDE Controller and get the Bus Master IDE 191 * Status register address. We'll use this later to read 192 * each IDE controller's DMA status to make sure we catch all 193 * DMA activity. 194 */ 195 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 196 PCI_DEVICE_ID_INTEL_82371AB, 197 PCI_ANY_ID, PCI_ANY_ID, NULL); 198 if (dev) { 199 errata.piix4.bmisx = pci_resource_start(dev, 4); 200 pci_dev_put(dev); 201 } 202 203 /* 204 * Type-F DMA 205 * ---------- 206 * Find the PIIX4 ISA Controller and read the Motherboard 207 * DMA controller's status to see if Type-F (Fast) DMA mode 208 * is enabled (bit 7) on either channel. Note that we'll 209 * disable C3 support if this is enabled, as some legacy 210 * devices won't operate well if fast DMA is disabled. 211 */ 212 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 213 PCI_DEVICE_ID_INTEL_82371AB_0, 214 PCI_ANY_ID, PCI_ANY_ID, NULL); 215 if (dev) { 216 pci_read_config_byte(dev, 0x76, &value1); 217 pci_read_config_byte(dev, 0x77, &value2); 218 if ((value1 & 0x80) || (value2 & 0x80)) 219 errata.piix4.fdma = 1; 220 pci_dev_put(dev); 221 } 222 223 break; 224 } 225 226 if (errata.piix4.bmisx) 227 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 228 "Bus master activity detection (BM-IDE) erratum enabled\n")); 229 if (errata.piix4.fdma) 230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 231 "Type-F DMA livelock erratum (C3 disabled)\n")); 232 233 return 0; 234 } 235 236 static int acpi_processor_errata(struct acpi_processor *pr) 237 { 238 int result = 0; 239 struct pci_dev *dev = NULL; 240 241 242 if (!pr) 243 return -EINVAL; 244 245 /* 246 * PIIX4 247 */ 248 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 249 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 250 PCI_ANY_ID, NULL); 251 if (dev) { 252 result = acpi_processor_errata_piix4(dev); 253 pci_dev_put(dev); 254 } 255 256 return result; 257 } 258 259 /* -------------------------------------------------------------------------- 260 FS Interface (/proc) 261 -------------------------------------------------------------------------- */ 262 263 #ifdef CONFIG_ACPI_PROCFS 264 static struct proc_dir_entry *acpi_processor_dir = NULL; 265 266 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 267 { 268 struct acpi_processor *pr = seq->private; 269 270 271 if (!pr) 272 goto end; 273 274 seq_printf(seq, "processor id: %d\n" 275 "acpi id: %d\n" 276 "bus mastering control: %s\n" 277 "power management: %s\n" 278 "throttling control: %s\n" 279 "limit interface: %s\n", 280 pr->id, 281 pr->acpi_id, 282 pr->flags.bm_control ? "yes" : "no", 283 pr->flags.power ? "yes" : "no", 284 pr->flags.throttling ? "yes" : "no", 285 pr->flags.limit ? "yes" : "no"); 286 287 end: 288 return 0; 289 } 290 291 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 292 { 293 return single_open(file, acpi_processor_info_seq_show, 294 PDE(inode)->data); 295 } 296 297 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device) 298 { 299 struct proc_dir_entry *entry = NULL; 300 301 302 if (!acpi_device_dir(device)) { 303 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 304 acpi_processor_dir); 305 if (!acpi_device_dir(device)) 306 return -ENODEV; 307 } 308 309 /* 'info' [R] */ 310 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, 311 S_IRUGO, acpi_device_dir(device), 312 &acpi_processor_info_fops, 313 acpi_driver_data(device)); 314 if (!entry) 315 return -EIO; 316 317 /* 'throttling' [R/W] */ 318 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, 319 S_IFREG | S_IRUGO | S_IWUSR, 320 acpi_device_dir(device), 321 &acpi_processor_throttling_fops, 322 acpi_driver_data(device)); 323 if (!entry) 324 return -EIO; 325 326 /* 'limit' [R/W] */ 327 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, 328 S_IFREG | S_IRUGO | S_IWUSR, 329 acpi_device_dir(device), 330 &acpi_processor_limit_fops, 331 acpi_driver_data(device)); 332 if (!entry) 333 return -EIO; 334 return 0; 335 } 336 static int acpi_processor_remove_fs(struct acpi_device *device) 337 { 338 339 if (acpi_device_dir(device)) { 340 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 341 acpi_device_dir(device)); 342 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 343 acpi_device_dir(device)); 344 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 345 acpi_device_dir(device)); 346 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 347 acpi_device_dir(device) = NULL; 348 } 349 350 return 0; 351 } 352 #else 353 static inline int acpi_processor_add_fs(struct acpi_device *device) 354 { 355 return 0; 356 } 357 static inline int acpi_processor_remove_fs(struct acpi_device *device) 358 { 359 return 0; 360 } 361 #endif 362 363 /* -------------------------------------------------------------------------- 364 Driver Interface 365 -------------------------------------------------------------------------- */ 366 367 static int acpi_processor_get_info(struct acpi_device *device) 368 { 369 acpi_status status = 0; 370 union acpi_object object = { 0 }; 371 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 372 struct acpi_processor *pr; 373 int cpu_index, device_declaration = 0; 374 static int cpu0_initialized; 375 376 pr = acpi_driver_data(device); 377 if (!pr) 378 return -EINVAL; 379 380 if (num_online_cpus() > 1) 381 errata.smp = TRUE; 382 383 acpi_processor_errata(pr); 384 385 /* 386 * Check to see if we have bus mastering arbitration control. This 387 * is required for proper C3 usage (to maintain cache coherency). 388 */ 389 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 390 pr->flags.bm_control = 1; 391 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 392 "Bus mastering arbitration control present\n")); 393 } else 394 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 395 "No bus mastering arbitration control\n")); 396 397 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 398 /* Declared with "Processor" statement; match ProcessorID */ 399 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 400 if (ACPI_FAILURE(status)) { 401 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 402 return -ENODEV; 403 } 404 405 /* 406 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 407 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 408 * arch/xxx/acpi.c 409 */ 410 pr->acpi_id = object.processor.proc_id; 411 } else { 412 /* 413 * Declared with "Device" statement; match _UID. 414 * Note that we don't handle string _UIDs yet. 415 */ 416 unsigned long long value; 417 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 418 NULL, &value); 419 if (ACPI_FAILURE(status)) { 420 printk(KERN_ERR PREFIX 421 "Evaluating processor _UID [%#x]\n", status); 422 return -ENODEV; 423 } 424 device_declaration = 1; 425 pr->acpi_id = value; 426 } 427 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id); 428 429 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 430 if (!cpu0_initialized && (cpu_index == -1) && 431 (num_online_cpus() == 1)) { 432 cpu_index = 0; 433 } 434 435 cpu0_initialized = 1; 436 437 pr->id = cpu_index; 438 439 /* 440 * Extra Processor objects may be enumerated on MP systems with 441 * less than the max # of CPUs. They should be ignored _iff 442 * they are physically not present. 443 */ 444 if (pr->id == -1) { 445 if (ACPI_FAILURE 446 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 447 return -ENODEV; 448 } 449 } 450 /* 451 * On some boxes several processors use the same processor bus id. 452 * But they are located in different scope. For example: 453 * \_SB.SCK0.CPU0 454 * \_SB.SCK1.CPU0 455 * Rename the processor device bus id. And the new bus id will be 456 * generated as the following format: 457 * CPU+CPU ID. 458 */ 459 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 460 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 461 pr->acpi_id)); 462 463 if (!object.processor.pblk_address) 464 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 465 else if (object.processor.pblk_length != 6) 466 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 467 object.processor.pblk_length); 468 else { 469 pr->throttling.address = object.processor.pblk_address; 470 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 471 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 472 473 pr->pblk = object.processor.pblk_address; 474 475 /* 476 * We don't care about error returns - we just try to mark 477 * these reserved so that nobody else is confused into thinking 478 * that this region might be unused.. 479 * 480 * (In particular, allocating the IO range for Cardbus) 481 */ 482 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 483 } 484 485 /* 486 * If ACPI describes a slot number for this CPU, we can use it 487 * ensure we get the right value in the "physical id" field 488 * of /proc/cpuinfo 489 */ 490 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 491 if (ACPI_SUCCESS(status)) 492 arch_fix_phys_package_id(pr->id, object.integer.value); 493 494 return 0; 495 } 496 497 static DEFINE_PER_CPU(void *, processor_device_array); 498 499 static void acpi_processor_notify(struct acpi_device *device, u32 event) 500 { 501 struct acpi_processor *pr = acpi_driver_data(device); 502 int saved; 503 504 if (!pr) 505 return; 506 507 switch (event) { 508 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 509 saved = pr->performance_platform_limit; 510 acpi_processor_ppc_has_changed(pr, 1); 511 if (saved == pr->performance_platform_limit) 512 break; 513 acpi_bus_generate_proc_event(device, event, 514 pr->performance_platform_limit); 515 acpi_bus_generate_netlink_event(device->pnp.device_class, 516 dev_name(&device->dev), event, 517 pr->performance_platform_limit); 518 break; 519 case ACPI_PROCESSOR_NOTIFY_POWER: 520 acpi_processor_cst_has_changed(pr); 521 acpi_bus_generate_proc_event(device, event, 0); 522 acpi_bus_generate_netlink_event(device->pnp.device_class, 523 dev_name(&device->dev), event, 0); 524 break; 525 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 526 acpi_processor_tstate_has_changed(pr); 527 acpi_bus_generate_proc_event(device, event, 0); 528 acpi_bus_generate_netlink_event(device->pnp.device_class, 529 dev_name(&device->dev), event, 0); 530 default: 531 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 532 "Unsupported event [0x%x]\n", event)); 533 break; 534 } 535 536 return; 537 } 538 539 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 540 unsigned long action, void *hcpu) 541 { 542 unsigned int cpu = (unsigned long)hcpu; 543 struct acpi_processor *pr = per_cpu(processors, cpu); 544 545 if (action == CPU_ONLINE && pr) { 546 acpi_processor_ppc_has_changed(pr, 0); 547 acpi_processor_cst_has_changed(pr); 548 acpi_processor_tstate_has_changed(pr); 549 } 550 return NOTIFY_OK; 551 } 552 553 static struct notifier_block acpi_cpu_notifier = 554 { 555 .notifier_call = acpi_cpu_soft_notify, 556 }; 557 558 static int __cpuinit acpi_processor_add(struct acpi_device *device) 559 { 560 struct acpi_processor *pr = NULL; 561 int result = 0; 562 struct sys_device *sysdev; 563 564 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 565 if (!pr) 566 return -ENOMEM; 567 568 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 569 kfree(pr); 570 return -ENOMEM; 571 } 572 573 pr->handle = device->handle; 574 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 575 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 576 device->driver_data = pr; 577 578 result = acpi_processor_get_info(device); 579 if (result) { 580 /* Processor is physically not present */ 581 return 0; 582 } 583 584 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 585 586 /* 587 * Buggy BIOS check 588 * ACPI id of processors can be reported wrongly by the BIOS. 589 * Don't trust it blindly 590 */ 591 if (per_cpu(processor_device_array, pr->id) != NULL && 592 per_cpu(processor_device_array, pr->id) != device) { 593 printk(KERN_WARNING "BIOS reported wrong ACPI id " 594 "for the processor\n"); 595 result = -ENODEV; 596 goto err_free_cpumask; 597 } 598 per_cpu(processor_device_array, pr->id) = device; 599 600 per_cpu(processors, pr->id) = pr; 601 602 result = acpi_processor_add_fs(device); 603 if (result) 604 goto err_free_cpumask; 605 606 sysdev = get_cpu_sysdev(pr->id); 607 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { 608 result = -EFAULT; 609 goto err_remove_fs; 610 } 611 612 #ifdef CONFIG_CPU_FREQ 613 acpi_processor_ppc_has_changed(pr, 0); 614 #endif 615 acpi_processor_get_throttling_info(pr); 616 acpi_processor_get_limit_info(pr); 617 618 619 acpi_processor_power_init(pr, device); 620 621 pr->cdev = thermal_cooling_device_register("Processor", device, 622 &processor_cooling_ops); 623 if (IS_ERR(pr->cdev)) { 624 result = PTR_ERR(pr->cdev); 625 goto err_power_exit; 626 } 627 628 dev_dbg(&device->dev, "registered as cooling_device%d\n", 629 pr->cdev->id); 630 631 result = sysfs_create_link(&device->dev.kobj, 632 &pr->cdev->device.kobj, 633 "thermal_cooling"); 634 if (result) { 635 printk(KERN_ERR PREFIX "Create sysfs link\n"); 636 goto err_thermal_unregister; 637 } 638 result = sysfs_create_link(&pr->cdev->device.kobj, 639 &device->dev.kobj, 640 "device"); 641 if (result) { 642 printk(KERN_ERR PREFIX "Create sysfs link\n"); 643 goto err_remove_sysfs; 644 } 645 646 return 0; 647 648 err_remove_sysfs: 649 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 650 err_thermal_unregister: 651 thermal_cooling_device_unregister(pr->cdev); 652 err_power_exit: 653 acpi_processor_power_exit(pr, device); 654 err_remove_fs: 655 acpi_processor_remove_fs(device); 656 err_free_cpumask: 657 free_cpumask_var(pr->throttling.shared_cpu_map); 658 659 return result; 660 } 661 662 static int acpi_processor_remove(struct acpi_device *device, int type) 663 { 664 struct acpi_processor *pr = NULL; 665 666 667 if (!device || !acpi_driver_data(device)) 668 return -EINVAL; 669 670 pr = acpi_driver_data(device); 671 672 if (pr->id >= nr_cpu_ids) 673 goto free; 674 675 if (type == ACPI_BUS_REMOVAL_EJECT) { 676 if (acpi_processor_handle_eject(pr)) 677 return -EINVAL; 678 } 679 680 acpi_processor_power_exit(pr, device); 681 682 sysfs_remove_link(&device->dev.kobj, "sysdev"); 683 684 acpi_processor_remove_fs(device); 685 686 if (pr->cdev) { 687 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 688 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 689 thermal_cooling_device_unregister(pr->cdev); 690 pr->cdev = NULL; 691 } 692 693 per_cpu(processors, pr->id) = NULL; 694 per_cpu(processor_device_array, pr->id) = NULL; 695 696 free: 697 free_cpumask_var(pr->throttling.shared_cpu_map); 698 kfree(pr); 699 700 return 0; 701 } 702 703 #ifdef CONFIG_ACPI_HOTPLUG_CPU 704 /**************************************************************************** 705 * Acpi processor hotplug support * 706 ****************************************************************************/ 707 708 static int is_processor_present(acpi_handle handle) 709 { 710 acpi_status status; 711 unsigned long long sta = 0; 712 713 714 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 715 716 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 717 return 1; 718 719 /* 720 * _STA is mandatory for a processor that supports hot plug 721 */ 722 if (status == AE_NOT_FOUND) 723 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 724 "Processor does not support hot plug\n")); 725 else 726 ACPI_EXCEPTION((AE_INFO, status, 727 "Processor Device is not present")); 728 return 0; 729 } 730 731 static 732 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 733 { 734 acpi_handle phandle; 735 struct acpi_device *pdev; 736 737 738 if (acpi_get_parent(handle, &phandle)) { 739 return -ENODEV; 740 } 741 742 if (acpi_bus_get_device(phandle, &pdev)) { 743 return -ENODEV; 744 } 745 746 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 747 return -ENODEV; 748 } 749 750 return 0; 751 } 752 753 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 754 u32 event, void *data) 755 { 756 struct acpi_processor *pr; 757 struct acpi_device *device = NULL; 758 int result; 759 760 761 switch (event) { 762 case ACPI_NOTIFY_BUS_CHECK: 763 case ACPI_NOTIFY_DEVICE_CHECK: 764 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 765 "Processor driver received %s event\n", 766 (event == ACPI_NOTIFY_BUS_CHECK) ? 767 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 768 769 if (!is_processor_present(handle)) 770 break; 771 772 if (acpi_bus_get_device(handle, &device)) { 773 result = acpi_processor_device_add(handle, &device); 774 if (result) 775 printk(KERN_ERR PREFIX 776 "Unable to add the device\n"); 777 break; 778 } 779 break; 780 case ACPI_NOTIFY_EJECT_REQUEST: 781 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 782 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 783 784 if (acpi_bus_get_device(handle, &device)) { 785 printk(KERN_ERR PREFIX 786 "Device don't exist, dropping EJECT\n"); 787 break; 788 } 789 pr = acpi_driver_data(device); 790 if (!pr) { 791 printk(KERN_ERR PREFIX 792 "Driver data is NULL, dropping EJECT\n"); 793 return; 794 } 795 break; 796 default: 797 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 798 "Unsupported event [0x%x]\n", event)); 799 break; 800 } 801 802 return; 803 } 804 805 static acpi_status 806 processor_walk_namespace_cb(acpi_handle handle, 807 u32 lvl, void *context, void **rv) 808 { 809 acpi_status status; 810 int *action = context; 811 acpi_object_type type = 0; 812 813 status = acpi_get_type(handle, &type); 814 if (ACPI_FAILURE(status)) 815 return (AE_OK); 816 817 if (type != ACPI_TYPE_PROCESSOR) 818 return (AE_OK); 819 820 switch (*action) { 821 case INSTALL_NOTIFY_HANDLER: 822 acpi_install_notify_handler(handle, 823 ACPI_SYSTEM_NOTIFY, 824 acpi_processor_hotplug_notify, 825 NULL); 826 break; 827 case UNINSTALL_NOTIFY_HANDLER: 828 acpi_remove_notify_handler(handle, 829 ACPI_SYSTEM_NOTIFY, 830 acpi_processor_hotplug_notify); 831 break; 832 default: 833 break; 834 } 835 836 return (AE_OK); 837 } 838 839 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 840 { 841 842 if (!is_processor_present(handle)) { 843 return AE_ERROR; 844 } 845 846 if (acpi_map_lsapic(handle, p_cpu)) 847 return AE_ERROR; 848 849 if (arch_register_cpu(*p_cpu)) { 850 acpi_unmap_lsapic(*p_cpu); 851 return AE_ERROR; 852 } 853 854 return AE_OK; 855 } 856 857 static int acpi_processor_handle_eject(struct acpi_processor *pr) 858 { 859 if (cpu_online(pr->id)) 860 cpu_down(pr->id); 861 862 arch_unregister_cpu(pr->id); 863 acpi_unmap_lsapic(pr->id); 864 return (0); 865 } 866 #else 867 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 868 { 869 return AE_ERROR; 870 } 871 static int acpi_processor_handle_eject(struct acpi_processor *pr) 872 { 873 return (-EINVAL); 874 } 875 #endif 876 877 static 878 void acpi_processor_install_hotplug_notify(void) 879 { 880 #ifdef CONFIG_ACPI_HOTPLUG_CPU 881 int action = INSTALL_NOTIFY_HANDLER; 882 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 883 ACPI_ROOT_OBJECT, 884 ACPI_UINT32_MAX, 885 processor_walk_namespace_cb, NULL, &action, NULL); 886 #endif 887 register_hotcpu_notifier(&acpi_cpu_notifier); 888 } 889 890 static 891 void acpi_processor_uninstall_hotplug_notify(void) 892 { 893 #ifdef CONFIG_ACPI_HOTPLUG_CPU 894 int action = UNINSTALL_NOTIFY_HANDLER; 895 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 896 ACPI_ROOT_OBJECT, 897 ACPI_UINT32_MAX, 898 processor_walk_namespace_cb, NULL, &action, NULL); 899 #endif 900 unregister_hotcpu_notifier(&acpi_cpu_notifier); 901 } 902 903 /* 904 * We keep the driver loaded even when ACPI is not running. 905 * This is needed for the powernow-k8 driver, that works even without 906 * ACPI, but needs symbols from this driver 907 */ 908 909 static int __init acpi_processor_init(void) 910 { 911 int result = 0; 912 913 if (acpi_disabled) 914 return 0; 915 916 memset(&errata, 0, sizeof(errata)); 917 918 #ifdef CONFIG_ACPI_PROCFS 919 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 920 if (!acpi_processor_dir) 921 return -ENOMEM; 922 #endif 923 result = cpuidle_register_driver(&acpi_idle_driver); 924 if (result < 0) 925 goto out_proc; 926 927 result = acpi_bus_register_driver(&acpi_processor_driver); 928 if (result < 0) 929 goto out_cpuidle; 930 931 acpi_processor_install_hotplug_notify(); 932 933 acpi_thermal_cpufreq_init(); 934 935 acpi_processor_ppc_init(); 936 937 acpi_processor_throttling_init(); 938 939 return 0; 940 941 out_cpuidle: 942 cpuidle_unregister_driver(&acpi_idle_driver); 943 944 out_proc: 945 #ifdef CONFIG_ACPI_PROCFS 946 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 947 #endif 948 949 return result; 950 } 951 952 static void __exit acpi_processor_exit(void) 953 { 954 if (acpi_disabled) 955 return; 956 957 acpi_processor_ppc_exit(); 958 959 acpi_thermal_cpufreq_exit(); 960 961 acpi_processor_uninstall_hotplug_notify(); 962 963 acpi_bus_unregister_driver(&acpi_processor_driver); 964 965 cpuidle_unregister_driver(&acpi_idle_driver); 966 967 #ifdef CONFIG_ACPI_PROCFS 968 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 969 #endif 970 971 return; 972 } 973 974 module_init(acpi_processor_init); 975 module_exit(acpi_processor_exit); 976 977 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 978 979 MODULE_ALIAS("processor"); 980