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 48 #include <asm/io.h> 49 #include <asm/system.h> 50 #include <asm/cpu.h> 51 #include <asm/delay.h> 52 #include <asm/uaccess.h> 53 #include <asm/processor.h> 54 #include <asm/smp.h> 55 #include <asm/acpi.h> 56 57 #include <acpi/acpi_bus.h> 58 #include <acpi/acpi_drivers.h> 59 #include <acpi/processor.h> 60 61 #define ACPI_PROCESSOR_COMPONENT 0x01000000 62 #define ACPI_PROCESSOR_CLASS "processor" 63 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" 64 #define ACPI_PROCESSOR_DEVICE_NAME "Processor" 65 #define ACPI_PROCESSOR_FILE_INFO "info" 66 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 67 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 69 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 70 71 #define ACPI_PROCESSOR_LIMIT_USER 0 72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 73 74 #define ACPI_STA_PRESENT 0x00000001 75 76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 77 ACPI_MODULE_NAME("acpi_processor") 78 79 MODULE_AUTHOR("Paul Diefenbaugh"); 80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME); 81 MODULE_LICENSE("GPL"); 82 83 static int acpi_processor_add(struct acpi_device *device); 84 static int acpi_processor_start(struct acpi_device *device); 85 static int acpi_processor_remove(struct acpi_device *device, int type); 86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 89 static int acpi_processor_handle_eject(struct acpi_processor *pr); 90 91 static struct acpi_driver acpi_processor_driver = { 92 .name = ACPI_PROCESSOR_DRIVER_NAME, 93 .class = ACPI_PROCESSOR_CLASS, 94 .ids = ACPI_PROCESSOR_HID, 95 .ops = { 96 .add = acpi_processor_add, 97 .remove = acpi_processor_remove, 98 .start = acpi_processor_start, 99 }, 100 }; 101 102 #define INSTALL_NOTIFY_HANDLER 1 103 #define UNINSTALL_NOTIFY_HANDLER 2 104 105 static const struct file_operations acpi_processor_info_fops = { 106 .open = acpi_processor_info_open_fs, 107 .read = seq_read, 108 .llseek = seq_lseek, 109 .release = single_release, 110 }; 111 112 struct acpi_processor *processors[NR_CPUS]; 113 struct acpi_processor_errata errata __read_mostly; 114 115 /* -------------------------------------------------------------------------- 116 Errata Handling 117 -------------------------------------------------------------------------- */ 118 119 static int acpi_processor_errata_piix4(struct pci_dev *dev) 120 { 121 u8 rev = 0; 122 u8 value1 = 0; 123 u8 value2 = 0; 124 125 126 if (!dev) 127 return -EINVAL; 128 129 /* 130 * Note that 'dev' references the PIIX4 ACPI Controller. 131 */ 132 133 pci_read_config_byte(dev, PCI_REVISION_ID, &rev); 134 135 switch (rev) { 136 case 0: 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 138 break; 139 case 1: 140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 141 break; 142 case 2: 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 144 break; 145 case 3: 146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 147 break; 148 default: 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 150 break; 151 } 152 153 switch (rev) { 154 155 case 0: /* PIIX4 A-step */ 156 case 1: /* PIIX4 B-step */ 157 /* 158 * See specification changes #13 ("Manual Throttle Duty Cycle") 159 * and #14 ("Enabling and Disabling Manual Throttle"), plus 160 * erratum #5 ("STPCLK# Deassertion Time") from the January 161 * 2002 PIIX4 specification update. Applies to only older 162 * PIIX4 models. 163 */ 164 errata.piix4.throttle = 1; 165 166 case 2: /* PIIX4E */ 167 case 3: /* PIIX4M */ 168 /* 169 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 170 * Livelock") from the January 2002 PIIX4 specification update. 171 * Applies to all PIIX4 models. 172 */ 173 174 /* 175 * BM-IDE 176 * ------ 177 * Find the PIIX4 IDE Controller and get the Bus Master IDE 178 * Status register address. We'll use this later to read 179 * each IDE controller's DMA status to make sure we catch all 180 * DMA activity. 181 */ 182 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 183 PCI_DEVICE_ID_INTEL_82371AB, 184 PCI_ANY_ID, PCI_ANY_ID, NULL); 185 if (dev) { 186 errata.piix4.bmisx = pci_resource_start(dev, 4); 187 pci_dev_put(dev); 188 } 189 190 /* 191 * Type-F DMA 192 * ---------- 193 * Find the PIIX4 ISA Controller and read the Motherboard 194 * DMA controller's status to see if Type-F (Fast) DMA mode 195 * is enabled (bit 7) on either channel. Note that we'll 196 * disable C3 support if this is enabled, as some legacy 197 * devices won't operate well if fast DMA is disabled. 198 */ 199 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 200 PCI_DEVICE_ID_INTEL_82371AB_0, 201 PCI_ANY_ID, PCI_ANY_ID, NULL); 202 if (dev) { 203 pci_read_config_byte(dev, 0x76, &value1); 204 pci_read_config_byte(dev, 0x77, &value2); 205 if ((value1 & 0x80) || (value2 & 0x80)) 206 errata.piix4.fdma = 1; 207 pci_dev_put(dev); 208 } 209 210 break; 211 } 212 213 if (errata.piix4.bmisx) 214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 215 "Bus master activity detection (BM-IDE) erratum enabled\n")); 216 if (errata.piix4.fdma) 217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 218 "Type-F DMA livelock erratum (C3 disabled)\n")); 219 220 return 0; 221 } 222 223 static int acpi_processor_errata(struct acpi_processor *pr) 224 { 225 int result = 0; 226 struct pci_dev *dev = NULL; 227 228 229 if (!pr) 230 return -EINVAL; 231 232 /* 233 * PIIX4 234 */ 235 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 236 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 237 PCI_ANY_ID, NULL); 238 if (dev) { 239 result = acpi_processor_errata_piix4(dev); 240 pci_dev_put(dev); 241 } 242 243 return result; 244 } 245 246 /* -------------------------------------------------------------------------- 247 Common ACPI processor functions 248 -------------------------------------------------------------------------- */ 249 250 /* 251 * _PDC is required for a BIOS-OS handshake for most of the newer 252 * ACPI processor features. 253 */ 254 static int acpi_processor_set_pdc(struct acpi_processor *pr) 255 { 256 struct acpi_object_list *pdc_in = pr->pdc; 257 acpi_status status = AE_OK; 258 259 260 if (!pdc_in) 261 return status; 262 263 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 264 265 if (ACPI_FAILURE(status)) 266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 267 "Could not evaluate _PDC, using legacy perf. control...\n")); 268 269 return status; 270 } 271 272 /* -------------------------------------------------------------------------- 273 FS Interface (/proc) 274 -------------------------------------------------------------------------- */ 275 276 static struct proc_dir_entry *acpi_processor_dir = NULL; 277 278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 279 { 280 struct acpi_processor *pr = (struct acpi_processor *)seq->private; 281 282 283 if (!pr) 284 goto end; 285 286 seq_printf(seq, "processor id: %d\n" 287 "acpi id: %d\n" 288 "bus mastering control: %s\n" 289 "power management: %s\n" 290 "throttling control: %s\n" 291 "limit interface: %s\n", 292 pr->id, 293 pr->acpi_id, 294 pr->flags.bm_control ? "yes" : "no", 295 pr->flags.power ? "yes" : "no", 296 pr->flags.throttling ? "yes" : "no", 297 pr->flags.limit ? "yes" : "no"); 298 299 end: 300 return 0; 301 } 302 303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 304 { 305 return single_open(file, acpi_processor_info_seq_show, 306 PDE(inode)->data); 307 } 308 309 static int acpi_processor_add_fs(struct acpi_device *device) 310 { 311 struct proc_dir_entry *entry = NULL; 312 313 314 if (!acpi_device_dir(device)) { 315 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 316 acpi_processor_dir); 317 if (!acpi_device_dir(device)) 318 return -ENODEV; 319 } 320 acpi_device_dir(device)->owner = THIS_MODULE; 321 322 /* 'info' [R] */ 323 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 324 S_IRUGO, acpi_device_dir(device)); 325 if (!entry) 326 return -EIO; 327 else { 328 entry->proc_fops = &acpi_processor_info_fops; 329 entry->data = acpi_driver_data(device); 330 entry->owner = THIS_MODULE; 331 } 332 333 /* 'throttling' [R/W] */ 334 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 335 S_IFREG | S_IRUGO | S_IWUSR, 336 acpi_device_dir(device)); 337 if (!entry) 338 return -EIO; 339 else { 340 entry->proc_fops = &acpi_processor_throttling_fops; 341 entry->data = acpi_driver_data(device); 342 entry->owner = THIS_MODULE; 343 } 344 345 /* 'limit' [R/W] */ 346 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 347 S_IFREG | S_IRUGO | S_IWUSR, 348 acpi_device_dir(device)); 349 if (!entry) 350 return -EIO; 351 else { 352 entry->proc_fops = &acpi_processor_limit_fops; 353 entry->data = acpi_driver_data(device); 354 entry->owner = THIS_MODULE; 355 } 356 357 return 0; 358 } 359 360 static int acpi_processor_remove_fs(struct acpi_device *device) 361 { 362 363 if (acpi_device_dir(device)) { 364 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 365 acpi_device_dir(device)); 366 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 367 acpi_device_dir(device)); 368 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 369 acpi_device_dir(device)); 370 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 371 acpi_device_dir(device) = NULL; 372 } 373 374 return 0; 375 } 376 377 /* Use the acpiid in MADT to map cpus in case of SMP */ 378 #ifndef CONFIG_SMP 379 #define convert_acpiid_to_cpu(acpi_id) (-1) 380 #else 381 382 #ifdef CONFIG_IA64 383 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid 384 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 385 #define ARCH_BAD_APICID (0xffff) 386 #else 387 #define arch_acpiid_to_apicid x86_acpiid_to_apicid 388 #define arch_cpu_to_apicid x86_cpu_to_apicid 389 #define ARCH_BAD_APICID (0xff) 390 #endif 391 392 static int convert_acpiid_to_cpu(u8 acpi_id) 393 { 394 u16 apic_id; 395 int i; 396 397 apic_id = arch_acpiid_to_apicid[acpi_id]; 398 if (apic_id == ARCH_BAD_APICID) 399 return -1; 400 401 for (i = 0; i < NR_CPUS; i++) { 402 if (arch_cpu_to_apicid[i] == apic_id) 403 return i; 404 } 405 return -1; 406 } 407 #endif 408 409 /* -------------------------------------------------------------------------- 410 Driver Interface 411 -------------------------------------------------------------------------- */ 412 413 static int acpi_processor_get_info(struct acpi_processor *pr) 414 { 415 acpi_status status = 0; 416 union acpi_object object = { 0 }; 417 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 418 int cpu_index; 419 static int cpu0_initialized; 420 421 422 if (!pr) 423 return -EINVAL; 424 425 if (num_online_cpus() > 1) 426 errata.smp = TRUE; 427 428 acpi_processor_errata(pr); 429 430 /* 431 * Check to see if we have bus mastering arbitration control. This 432 * is required for proper C3 usage (to maintain cache coherency). 433 */ 434 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { 435 pr->flags.bm_control = 1; 436 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 437 "Bus mastering arbitration control present\n")); 438 } else 439 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 440 "No bus mastering arbitration control\n")); 441 442 /* 443 * Evalute the processor object. Note that it is common on SMP to 444 * have the first (boot) processor with a valid PBLK address while 445 * all others have a NULL address. 446 */ 447 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 448 if (ACPI_FAILURE(status)) { 449 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 450 return -ENODEV; 451 } 452 453 /* 454 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 455 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 456 */ 457 pr->acpi_id = object.processor.proc_id; 458 459 cpu_index = convert_acpiid_to_cpu(pr->acpi_id); 460 461 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 462 if (!cpu0_initialized && (cpu_index == -1) && 463 (num_online_cpus() == 1)) { 464 cpu_index = 0; 465 } 466 467 cpu0_initialized = 1; 468 469 pr->id = cpu_index; 470 471 /* 472 * Extra Processor objects may be enumerated on MP systems with 473 * less than the max # of CPUs. They should be ignored _iff 474 * they are physically not present. 475 */ 476 if (cpu_index == -1) { 477 if (ACPI_FAILURE 478 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 479 printk(KERN_ERR PREFIX 480 "Getting cpuindex for acpiid 0x%x\n", 481 pr->acpi_id); 482 return -ENODEV; 483 } 484 } 485 486 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 487 pr->acpi_id)); 488 489 if (!object.processor.pblk_address) 490 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 491 else if (object.processor.pblk_length != 6) 492 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 493 object.processor.pblk_length); 494 else { 495 pr->throttling.address = object.processor.pblk_address; 496 pr->throttling.duty_offset = acpi_fadt.duty_offset; 497 pr->throttling.duty_width = acpi_fadt.duty_width; 498 499 pr->pblk = object.processor.pblk_address; 500 501 /* 502 * We don't care about error returns - we just try to mark 503 * these reserved so that nobody else is confused into thinking 504 * that this region might be unused.. 505 * 506 * (In particular, allocating the IO range for Cardbus) 507 */ 508 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 509 } 510 511 #ifdef CONFIG_CPU_FREQ 512 acpi_processor_ppc_has_changed(pr); 513 #endif 514 acpi_processor_get_throttling_info(pr); 515 acpi_processor_get_limit_info(pr); 516 517 return 0; 518 } 519 520 static void *processor_device_array[NR_CPUS]; 521 522 static int __cpuinit acpi_processor_start(struct acpi_device *device) 523 { 524 int result = 0; 525 acpi_status status = AE_OK; 526 struct acpi_processor *pr; 527 528 529 pr = acpi_driver_data(device); 530 531 result = acpi_processor_get_info(pr); 532 if (result) { 533 /* Processor is physically not present */ 534 return 0; 535 } 536 537 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 538 539 /* 540 * Buggy BIOS check 541 * ACPI id of processors can be reported wrongly by the BIOS. 542 * Don't trust it blindly 543 */ 544 if (processor_device_array[pr->id] != NULL && 545 processor_device_array[pr->id] != (void *)device) { 546 printk(KERN_WARNING "BIOS reported wrong ACPI id" 547 "for the processor\n"); 548 return -ENODEV; 549 } 550 processor_device_array[pr->id] = (void *)device; 551 552 processors[pr->id] = pr; 553 554 result = acpi_processor_add_fs(device); 555 if (result) 556 goto end; 557 558 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 559 acpi_processor_notify, pr); 560 561 /* _PDC call should be done before doing anything else (if reqd.). */ 562 arch_acpi_processor_init_pdc(pr); 563 acpi_processor_set_pdc(pr); 564 565 acpi_processor_power_init(pr, device); 566 567 if (pr->flags.throttling) { 568 printk(KERN_INFO PREFIX "%s [%s] (supports", 569 acpi_device_name(device), acpi_device_bid(device)); 570 printk(" %d throttling states", pr->throttling.state_count); 571 printk(")\n"); 572 } 573 574 end: 575 576 return result; 577 } 578 579 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 580 { 581 struct acpi_processor *pr = (struct acpi_processor *)data; 582 struct acpi_device *device = NULL; 583 584 585 if (!pr) 586 return; 587 588 if (acpi_bus_get_device(pr->handle, &device)) 589 return; 590 591 switch (event) { 592 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 593 acpi_processor_ppc_has_changed(pr); 594 acpi_bus_generate_event(device, event, 595 pr->performance_platform_limit); 596 break; 597 case ACPI_PROCESSOR_NOTIFY_POWER: 598 acpi_processor_cst_has_changed(pr); 599 acpi_bus_generate_event(device, event, 0); 600 break; 601 default: 602 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 603 "Unsupported event [0x%x]\n", event)); 604 break; 605 } 606 607 return; 608 } 609 610 static int acpi_processor_add(struct acpi_device *device) 611 { 612 struct acpi_processor *pr = NULL; 613 614 615 if (!device) 616 return -EINVAL; 617 618 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); 619 if (!pr) 620 return -ENOMEM; 621 memset(pr, 0, sizeof(struct acpi_processor)); 622 623 pr->handle = device->handle; 624 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 625 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 626 acpi_driver_data(device) = pr; 627 628 return 0; 629 } 630 631 static int acpi_processor_remove(struct acpi_device *device, int type) 632 { 633 acpi_status status = AE_OK; 634 struct acpi_processor *pr = NULL; 635 636 637 if (!device || !acpi_driver_data(device)) 638 return -EINVAL; 639 640 pr = (struct acpi_processor *)acpi_driver_data(device); 641 642 if (pr->id >= NR_CPUS) { 643 kfree(pr); 644 return 0; 645 } 646 647 if (type == ACPI_BUS_REMOVAL_EJECT) { 648 if (acpi_processor_handle_eject(pr)) 649 return -EINVAL; 650 } 651 652 acpi_processor_power_exit(pr, device); 653 654 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 655 acpi_processor_notify); 656 657 acpi_processor_remove_fs(device); 658 659 processors[pr->id] = NULL; 660 661 kfree(pr); 662 663 return 0; 664 } 665 666 #ifdef CONFIG_ACPI_HOTPLUG_CPU 667 /**************************************************************************** 668 * Acpi processor hotplug support * 669 ****************************************************************************/ 670 671 static int is_processor_present(acpi_handle handle); 672 673 static int is_processor_present(acpi_handle handle) 674 { 675 acpi_status status; 676 unsigned long sta = 0; 677 678 679 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 680 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { 681 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 682 return 0; 683 } 684 return 1; 685 } 686 687 static 688 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 689 { 690 acpi_handle phandle; 691 struct acpi_device *pdev; 692 struct acpi_processor *pr; 693 694 695 if (acpi_get_parent(handle, &phandle)) { 696 return -ENODEV; 697 } 698 699 if (acpi_bus_get_device(phandle, &pdev)) { 700 return -ENODEV; 701 } 702 703 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 704 return -ENODEV; 705 } 706 707 acpi_bus_start(*device); 708 709 pr = acpi_driver_data(*device); 710 if (!pr) 711 return -ENODEV; 712 713 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 714 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); 715 } 716 return 0; 717 } 718 719 static void 720 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 721 { 722 struct acpi_processor *pr; 723 struct acpi_device *device = NULL; 724 int result; 725 726 727 switch (event) { 728 case ACPI_NOTIFY_BUS_CHECK: 729 case ACPI_NOTIFY_DEVICE_CHECK: 730 printk("Processor driver received %s event\n", 731 (event == ACPI_NOTIFY_BUS_CHECK) ? 732 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 733 734 if (!is_processor_present(handle)) 735 break; 736 737 if (acpi_bus_get_device(handle, &device)) { 738 result = acpi_processor_device_add(handle, &device); 739 if (result) 740 printk(KERN_ERR PREFIX 741 "Unable to add the device\n"); 742 break; 743 } 744 745 pr = acpi_driver_data(device); 746 if (!pr) { 747 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 748 break; 749 } 750 751 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 752 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 753 break; 754 } 755 756 result = acpi_processor_start(device); 757 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 758 kobject_uevent(&device->kobj, KOBJ_ONLINE); 759 } else { 760 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 761 acpi_device_bid(device)); 762 } 763 break; 764 case ACPI_NOTIFY_EJECT_REQUEST: 765 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 766 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 767 768 if (acpi_bus_get_device(handle, &device)) { 769 printk(KERN_ERR PREFIX 770 "Device don't exist, dropping EJECT\n"); 771 break; 772 } 773 pr = acpi_driver_data(device); 774 if (!pr) { 775 printk(KERN_ERR PREFIX 776 "Driver data is NULL, dropping EJECT\n"); 777 return; 778 } 779 780 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 781 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 782 break; 783 default: 784 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 785 "Unsupported event [0x%x]\n", event)); 786 break; 787 } 788 789 return; 790 } 791 792 static acpi_status 793 processor_walk_namespace_cb(acpi_handle handle, 794 u32 lvl, void *context, void **rv) 795 { 796 acpi_status status; 797 int *action = context; 798 acpi_object_type type = 0; 799 800 status = acpi_get_type(handle, &type); 801 if (ACPI_FAILURE(status)) 802 return (AE_OK); 803 804 if (type != ACPI_TYPE_PROCESSOR) 805 return (AE_OK); 806 807 switch (*action) { 808 case INSTALL_NOTIFY_HANDLER: 809 acpi_install_notify_handler(handle, 810 ACPI_SYSTEM_NOTIFY, 811 acpi_processor_hotplug_notify, 812 NULL); 813 break; 814 case UNINSTALL_NOTIFY_HANDLER: 815 acpi_remove_notify_handler(handle, 816 ACPI_SYSTEM_NOTIFY, 817 acpi_processor_hotplug_notify); 818 break; 819 default: 820 break; 821 } 822 823 return (AE_OK); 824 } 825 826 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 827 { 828 829 if (!is_processor_present(handle)) { 830 return AE_ERROR; 831 } 832 833 if (acpi_map_lsapic(handle, p_cpu)) 834 return AE_ERROR; 835 836 if (arch_register_cpu(*p_cpu)) { 837 acpi_unmap_lsapic(*p_cpu); 838 return AE_ERROR; 839 } 840 841 return AE_OK; 842 } 843 844 static int acpi_processor_handle_eject(struct acpi_processor *pr) 845 { 846 if (cpu_online(pr->id)) { 847 return (-EINVAL); 848 } 849 arch_unregister_cpu(pr->id); 850 acpi_unmap_lsapic(pr->id); 851 return (0); 852 } 853 #else 854 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 855 { 856 return AE_ERROR; 857 } 858 static int acpi_processor_handle_eject(struct acpi_processor *pr) 859 { 860 return (-EINVAL); 861 } 862 #endif 863 864 static 865 void acpi_processor_install_hotplug_notify(void) 866 { 867 #ifdef CONFIG_ACPI_HOTPLUG_CPU 868 int action = INSTALL_NOTIFY_HANDLER; 869 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 870 ACPI_ROOT_OBJECT, 871 ACPI_UINT32_MAX, 872 processor_walk_namespace_cb, &action, NULL); 873 #endif 874 } 875 876 static 877 void acpi_processor_uninstall_hotplug_notify(void) 878 { 879 #ifdef CONFIG_ACPI_HOTPLUG_CPU 880 int action = UNINSTALL_NOTIFY_HANDLER; 881 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 882 ACPI_ROOT_OBJECT, 883 ACPI_UINT32_MAX, 884 processor_walk_namespace_cb, &action, NULL); 885 #endif 886 } 887 888 /* 889 * We keep the driver loaded even when ACPI is not running. 890 * This is needed for the powernow-k8 driver, that works even without 891 * ACPI, but needs symbols from this driver 892 */ 893 894 static int __init acpi_processor_init(void) 895 { 896 int result = 0; 897 898 899 memset(&processors, 0, sizeof(processors)); 900 memset(&errata, 0, sizeof(errata)); 901 902 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 903 if (!acpi_processor_dir) 904 return 0; 905 acpi_processor_dir->owner = THIS_MODULE; 906 907 result = acpi_bus_register_driver(&acpi_processor_driver); 908 if (result < 0) { 909 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 910 return 0; 911 } 912 913 acpi_processor_install_hotplug_notify(); 914 915 acpi_thermal_cpufreq_init(); 916 917 acpi_processor_ppc_init(); 918 919 return 0; 920 } 921 922 static void __exit acpi_processor_exit(void) 923 { 924 925 acpi_processor_ppc_exit(); 926 927 acpi_thermal_cpufreq_exit(); 928 929 acpi_processor_uninstall_hotplug_notify(); 930 931 acpi_bus_unregister_driver(&acpi_processor_driver); 932 933 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 934 935 return; 936 } 937 938 module_init(acpi_processor_init); 939 module_exit(acpi_processor_exit); 940 941 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 942 943 MODULE_ALIAS("processor"); 944