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 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; 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 ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4"); 126 127 if (!dev) 128 return_VALUE(-EINVAL); 129 130 /* 131 * Note that 'dev' references the PIIX4 ACPI Controller. 132 */ 133 134 pci_read_config_byte(dev, PCI_REVISION_ID, &rev); 135 136 switch (rev) { 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 (rev) { 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_VALUE(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 ACPI_FUNCTION_TRACE("acpi_processor_errata"); 230 231 if (!pr) 232 return_VALUE(-EINVAL); 233 234 /* 235 * PIIX4 236 */ 237 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 238 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 239 PCI_ANY_ID, NULL); 240 if (dev) { 241 result = acpi_processor_errata_piix4(dev); 242 pci_dev_put(dev); 243 } 244 245 return_VALUE(result); 246 } 247 248 /* -------------------------------------------------------------------------- 249 Common ACPI processor fucntions 250 -------------------------------------------------------------------------- */ 251 252 /* 253 * _PDC is required for a BIOS-OS handshake for most of the newer 254 * ACPI processor features. 255 */ 256 static int acpi_processor_set_pdc(struct acpi_processor *pr) 257 { 258 struct acpi_object_list *pdc_in = pr->pdc; 259 acpi_status status = AE_OK; 260 261 ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); 262 263 if (!pdc_in) 264 return_VALUE(status); 265 266 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 267 268 if (ACPI_FAILURE(status)) 269 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 270 "Could not evaluate _PDC, using legacy perf. control...\n")); 271 272 return_VALUE(status); 273 } 274 275 /* -------------------------------------------------------------------------- 276 FS Interface (/proc) 277 -------------------------------------------------------------------------- */ 278 279 static struct proc_dir_entry *acpi_processor_dir = NULL; 280 281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 282 { 283 struct acpi_processor *pr = (struct acpi_processor *)seq->private; 284 285 ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); 286 287 if (!pr) 288 goto end; 289 290 seq_printf(seq, "processor id: %d\n" 291 "acpi id: %d\n" 292 "bus mastering control: %s\n" 293 "power management: %s\n" 294 "throttling control: %s\n" 295 "limit interface: %s\n", 296 pr->id, 297 pr->acpi_id, 298 pr->flags.bm_control ? "yes" : "no", 299 pr->flags.power ? "yes" : "no", 300 pr->flags.throttling ? "yes" : "no", 301 pr->flags.limit ? "yes" : "no"); 302 303 end: 304 return_VALUE(0); 305 } 306 307 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 308 { 309 return single_open(file, acpi_processor_info_seq_show, 310 PDE(inode)->data); 311 } 312 313 static int acpi_processor_add_fs(struct acpi_device *device) 314 { 315 struct proc_dir_entry *entry = NULL; 316 317 ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); 318 319 if (!acpi_device_dir(device)) { 320 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 321 acpi_processor_dir); 322 if (!acpi_device_dir(device)) 323 return_VALUE(-ENODEV); 324 } 325 acpi_device_dir(device)->owner = THIS_MODULE; 326 327 /* 'info' [R] */ 328 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 329 S_IRUGO, acpi_device_dir(device)); 330 if (!entry) 331 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 332 "Unable to create '%s' fs entry\n", 333 ACPI_PROCESSOR_FILE_INFO)); 334 else { 335 entry->proc_fops = &acpi_processor_info_fops; 336 entry->data = acpi_driver_data(device); 337 entry->owner = THIS_MODULE; 338 } 339 340 /* 'throttling' [R/W] */ 341 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 342 S_IFREG | S_IRUGO | S_IWUSR, 343 acpi_device_dir(device)); 344 if (!entry) 345 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 346 "Unable to create '%s' fs entry\n", 347 ACPI_PROCESSOR_FILE_THROTTLING)); 348 else { 349 entry->proc_fops = &acpi_processor_throttling_fops; 350 entry->data = acpi_driver_data(device); 351 entry->owner = THIS_MODULE; 352 } 353 354 /* 'limit' [R/W] */ 355 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 356 S_IFREG | S_IRUGO | S_IWUSR, 357 acpi_device_dir(device)); 358 if (!entry) 359 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 360 "Unable to create '%s' fs entry\n", 361 ACPI_PROCESSOR_FILE_LIMIT)); 362 else { 363 entry->proc_fops = &acpi_processor_limit_fops; 364 entry->data = acpi_driver_data(device); 365 entry->owner = THIS_MODULE; 366 } 367 368 return_VALUE(0); 369 } 370 371 static int acpi_processor_remove_fs(struct acpi_device *device) 372 { 373 ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); 374 375 if (acpi_device_dir(device)) { 376 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 377 acpi_device_dir(device)); 378 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 379 acpi_device_dir(device)); 380 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 381 acpi_device_dir(device)); 382 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 383 acpi_device_dir(device) = NULL; 384 } 385 386 return_VALUE(0); 387 } 388 389 /* Use the acpiid in MADT to map cpus in case of SMP */ 390 #ifndef CONFIG_SMP 391 #define convert_acpiid_to_cpu(acpi_id) (0xff) 392 #else 393 394 #ifdef CONFIG_IA64 395 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid 396 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 397 #define ARCH_BAD_APICID (0xffff) 398 #else 399 #define arch_acpiid_to_apicid x86_acpiid_to_apicid 400 #define arch_cpu_to_apicid x86_cpu_to_apicid 401 #define ARCH_BAD_APICID (0xff) 402 #endif 403 404 static u8 convert_acpiid_to_cpu(u8 acpi_id) 405 { 406 u16 apic_id; 407 int i; 408 409 apic_id = arch_acpiid_to_apicid[acpi_id]; 410 if (apic_id == ARCH_BAD_APICID) 411 return -1; 412 413 for (i = 0; i < NR_CPUS; i++) { 414 if (arch_cpu_to_apicid[i] == apic_id) 415 return i; 416 } 417 return -1; 418 } 419 #endif 420 421 /* -------------------------------------------------------------------------- 422 Driver Interface 423 -------------------------------------------------------------------------- */ 424 425 static int acpi_processor_get_info(struct acpi_processor *pr) 426 { 427 acpi_status status = 0; 428 union acpi_object object = { 0 }; 429 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 430 u8 cpu_index; 431 static int cpu0_initialized; 432 433 ACPI_FUNCTION_TRACE("acpi_processor_get_info"); 434 435 if (!pr) 436 return_VALUE(-EINVAL); 437 438 if (num_online_cpus() > 1) 439 errata.smp = TRUE; 440 441 acpi_processor_errata(pr); 442 443 /* 444 * Check to see if we have bus mastering arbitration control. This 445 * is required for proper C3 usage (to maintain cache coherency). 446 */ 447 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { 448 pr->flags.bm_control = 1; 449 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 450 "Bus mastering arbitration control present\n")); 451 } else 452 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 453 "No bus mastering arbitration control\n")); 454 455 /* 456 * Evalute the processor object. Note that it is common on SMP to 457 * have the first (boot) processor with a valid PBLK address while 458 * all others have a NULL address. 459 */ 460 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 461 if (ACPI_FAILURE(status)) { 462 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 463 "Error evaluating processor object\n")); 464 return_VALUE(-ENODEV); 465 } 466 467 /* 468 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 469 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 470 */ 471 pr->acpi_id = object.processor.proc_id; 472 473 cpu_index = convert_acpiid_to_cpu(pr->acpi_id); 474 475 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 476 if (!cpu0_initialized && (cpu_index == 0xff) && 477 (num_online_cpus() == 1)) { 478 cpu_index = 0; 479 } 480 481 cpu0_initialized = 1; 482 483 pr->id = cpu_index; 484 485 /* 486 * Extra Processor objects may be enumerated on MP systems with 487 * less than the max # of CPUs. They should be ignored _iff 488 * they are physically not present. 489 */ 490 if (cpu_index >= NR_CPUS) { 491 if (ACPI_FAILURE 492 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 493 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 494 "Error getting cpuindex for acpiid 0x%x\n", 495 pr->acpi_id)); 496 return_VALUE(-ENODEV); 497 } 498 } 499 500 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 501 pr->acpi_id)); 502 503 if (!object.processor.pblk_address) 504 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 505 else if (object.processor.pblk_length != 6) 506 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n", 507 object.processor.pblk_length)); 508 else { 509 pr->throttling.address = object.processor.pblk_address; 510 pr->throttling.duty_offset = acpi_fadt.duty_offset; 511 pr->throttling.duty_width = acpi_fadt.duty_width; 512 513 pr->pblk = object.processor.pblk_address; 514 515 /* 516 * We don't care about error returns - we just try to mark 517 * these reserved so that nobody else is confused into thinking 518 * that this region might be unused.. 519 * 520 * (In particular, allocating the IO range for Cardbus) 521 */ 522 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 523 } 524 525 #ifdef CONFIG_CPU_FREQ 526 acpi_processor_ppc_has_changed(pr); 527 #endif 528 acpi_processor_get_throttling_info(pr); 529 acpi_processor_get_limit_info(pr); 530 531 return_VALUE(0); 532 } 533 534 static void *processor_device_array[NR_CPUS]; 535 536 static int acpi_processor_start(struct acpi_device *device) 537 { 538 int result = 0; 539 acpi_status status = AE_OK; 540 struct acpi_processor *pr; 541 542 ACPI_FUNCTION_TRACE("acpi_processor_start"); 543 544 pr = acpi_driver_data(device); 545 546 result = acpi_processor_get_info(pr); 547 if (result) { 548 /* Processor is physically not present */ 549 return_VALUE(0); 550 } 551 552 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 553 554 /* 555 * Buggy BIOS check 556 * ACPI id of processors can be reported wrongly by the BIOS. 557 * Don't trust it blindly 558 */ 559 if (processor_device_array[pr->id] != NULL && 560 processor_device_array[pr->id] != (void *)device) { 561 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id" 562 "for the processor\n")); 563 return_VALUE(-ENODEV); 564 } 565 processor_device_array[pr->id] = (void *)device; 566 567 processors[pr->id] = pr; 568 569 result = acpi_processor_add_fs(device); 570 if (result) 571 goto end; 572 573 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 574 acpi_processor_notify, pr); 575 if (ACPI_FAILURE(status)) { 576 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 577 "Error installing device notify handler\n")); 578 } 579 580 /* _PDC call should be done before doing anything else (if reqd.). */ 581 arch_acpi_processor_init_pdc(pr); 582 acpi_processor_set_pdc(pr); 583 584 acpi_processor_power_init(pr, device); 585 586 if (pr->flags.throttling) { 587 printk(KERN_INFO PREFIX "%s [%s] (supports", 588 acpi_device_name(device), acpi_device_bid(device)); 589 printk(" %d throttling states", pr->throttling.state_count); 590 printk(")\n"); 591 } 592 593 end: 594 595 return_VALUE(result); 596 } 597 598 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 599 { 600 struct acpi_processor *pr = (struct acpi_processor *)data; 601 struct acpi_device *device = NULL; 602 603 ACPI_FUNCTION_TRACE("acpi_processor_notify"); 604 605 if (!pr) 606 return_VOID; 607 608 if (acpi_bus_get_device(pr->handle, &device)) 609 return_VOID; 610 611 switch (event) { 612 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 613 acpi_processor_ppc_has_changed(pr); 614 acpi_bus_generate_event(device, event, 615 pr->performance_platform_limit); 616 break; 617 case ACPI_PROCESSOR_NOTIFY_POWER: 618 acpi_processor_cst_has_changed(pr); 619 acpi_bus_generate_event(device, event, 0); 620 break; 621 default: 622 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 623 "Unsupported event [0x%x]\n", event)); 624 break; 625 } 626 627 return_VOID; 628 } 629 630 static int acpi_processor_add(struct acpi_device *device) 631 { 632 struct acpi_processor *pr = NULL; 633 634 ACPI_FUNCTION_TRACE("acpi_processor_add"); 635 636 if (!device) 637 return_VALUE(-EINVAL); 638 639 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); 640 if (!pr) 641 return_VALUE(-ENOMEM); 642 memset(pr, 0, sizeof(struct acpi_processor)); 643 644 pr->handle = device->handle; 645 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 646 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 647 acpi_driver_data(device) = pr; 648 649 return_VALUE(0); 650 } 651 652 static int acpi_processor_remove(struct acpi_device *device, int type) 653 { 654 acpi_status status = AE_OK; 655 struct acpi_processor *pr = NULL; 656 657 ACPI_FUNCTION_TRACE("acpi_processor_remove"); 658 659 if (!device || !acpi_driver_data(device)) 660 return_VALUE(-EINVAL); 661 662 pr = (struct acpi_processor *)acpi_driver_data(device); 663 664 if (pr->id >= NR_CPUS) { 665 kfree(pr); 666 return_VALUE(0); 667 } 668 669 if (type == ACPI_BUS_REMOVAL_EJECT) { 670 if (acpi_processor_handle_eject(pr)) 671 return_VALUE(-EINVAL); 672 } 673 674 acpi_processor_power_exit(pr, device); 675 676 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 677 acpi_processor_notify); 678 if (ACPI_FAILURE(status)) { 679 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 680 "Error removing notify handler\n")); 681 } 682 683 acpi_processor_remove_fs(device); 684 685 processors[pr->id] = NULL; 686 687 kfree(pr); 688 689 return_VALUE(0); 690 } 691 692 #ifdef CONFIG_ACPI_HOTPLUG_CPU 693 /**************************************************************************** 694 * Acpi processor hotplug support * 695 ****************************************************************************/ 696 697 static int is_processor_present(acpi_handle handle); 698 699 static int is_processor_present(acpi_handle handle) 700 { 701 acpi_status status; 702 unsigned long sta = 0; 703 704 ACPI_FUNCTION_TRACE("is_processor_present"); 705 706 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 707 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { 708 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 709 "Processor Device is not present\n")); 710 return_VALUE(0); 711 } 712 return_VALUE(1); 713 } 714 715 static 716 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 717 { 718 acpi_handle phandle; 719 struct acpi_device *pdev; 720 struct acpi_processor *pr; 721 722 ACPI_FUNCTION_TRACE("acpi_processor_device_add"); 723 724 if (acpi_get_parent(handle, &phandle)) { 725 return_VALUE(-ENODEV); 726 } 727 728 if (acpi_bus_get_device(phandle, &pdev)) { 729 return_VALUE(-ENODEV); 730 } 731 732 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 733 return_VALUE(-ENODEV); 734 } 735 736 acpi_bus_start(*device); 737 738 pr = acpi_driver_data(*device); 739 if (!pr) 740 return_VALUE(-ENODEV); 741 742 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 743 kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); 744 } 745 return_VALUE(0); 746 } 747 748 static void 749 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 750 { 751 struct acpi_processor *pr; 752 struct acpi_device *device = NULL; 753 int result; 754 755 ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); 756 757 switch (event) { 758 case ACPI_NOTIFY_BUS_CHECK: 759 case ACPI_NOTIFY_DEVICE_CHECK: 760 printk("Processor driver received %s event\n", 761 (event == ACPI_NOTIFY_BUS_CHECK) ? 762 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 763 764 if (!is_processor_present(handle)) 765 break; 766 767 if (acpi_bus_get_device(handle, &device)) { 768 result = acpi_processor_device_add(handle, &device); 769 if (result) 770 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 771 "Unable to add the device\n")); 772 break; 773 } 774 775 pr = acpi_driver_data(device); 776 if (!pr) { 777 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 778 "Driver data is NULL\n")); 779 break; 780 } 781 782 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 783 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 784 break; 785 } 786 787 result = acpi_processor_start(device); 788 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 789 kobject_uevent(&device->kobj, KOBJ_ONLINE); 790 } else { 791 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 792 "Device [%s] failed to start\n", 793 acpi_device_bid(device))); 794 } 795 break; 796 case ACPI_NOTIFY_EJECT_REQUEST: 797 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 798 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 799 800 if (acpi_bus_get_device(handle, &device)) { 801 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 802 "Device don't exist, dropping EJECT\n")); 803 break; 804 } 805 pr = acpi_driver_data(device); 806 if (!pr) { 807 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 808 "Driver data is NULL, dropping EJECT\n")); 809 return_VOID; 810 } 811 812 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 813 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 814 break; 815 default: 816 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 817 "Unsupported event [0x%x]\n", event)); 818 break; 819 } 820 821 return_VOID; 822 } 823 824 static acpi_status 825 processor_walk_namespace_cb(acpi_handle handle, 826 u32 lvl, void *context, void **rv) 827 { 828 acpi_status status; 829 int *action = context; 830 acpi_object_type type = 0; 831 832 status = acpi_get_type(handle, &type); 833 if (ACPI_FAILURE(status)) 834 return (AE_OK); 835 836 if (type != ACPI_TYPE_PROCESSOR) 837 return (AE_OK); 838 839 switch (*action) { 840 case INSTALL_NOTIFY_HANDLER: 841 acpi_install_notify_handler(handle, 842 ACPI_SYSTEM_NOTIFY, 843 acpi_processor_hotplug_notify, 844 NULL); 845 break; 846 case UNINSTALL_NOTIFY_HANDLER: 847 acpi_remove_notify_handler(handle, 848 ACPI_SYSTEM_NOTIFY, 849 acpi_processor_hotplug_notify); 850 break; 851 default: 852 break; 853 } 854 855 return (AE_OK); 856 } 857 858 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 859 { 860 ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); 861 862 if (!is_processor_present(handle)) { 863 return_VALUE(AE_ERROR); 864 } 865 866 if (acpi_map_lsapic(handle, p_cpu)) 867 return_VALUE(AE_ERROR); 868 869 if (arch_register_cpu(*p_cpu)) { 870 acpi_unmap_lsapic(*p_cpu); 871 return_VALUE(AE_ERROR); 872 } 873 874 return_VALUE(AE_OK); 875 } 876 877 static int acpi_processor_handle_eject(struct acpi_processor *pr) 878 { 879 if (cpu_online(pr->id)) { 880 return (-EINVAL); 881 } 882 arch_unregister_cpu(pr->id); 883 acpi_unmap_lsapic(pr->id); 884 return (0); 885 } 886 #else 887 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 888 { 889 return AE_ERROR; 890 } 891 static int acpi_processor_handle_eject(struct acpi_processor *pr) 892 { 893 return (-EINVAL); 894 } 895 #endif 896 897 static 898 void acpi_processor_install_hotplug_notify(void) 899 { 900 #ifdef CONFIG_ACPI_HOTPLUG_CPU 901 int action = INSTALL_NOTIFY_HANDLER; 902 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 903 ACPI_ROOT_OBJECT, 904 ACPI_UINT32_MAX, 905 processor_walk_namespace_cb, &action, NULL); 906 #endif 907 } 908 909 static 910 void acpi_processor_uninstall_hotplug_notify(void) 911 { 912 #ifdef CONFIG_ACPI_HOTPLUG_CPU 913 int action = UNINSTALL_NOTIFY_HANDLER; 914 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 915 ACPI_ROOT_OBJECT, 916 ACPI_UINT32_MAX, 917 processor_walk_namespace_cb, &action, NULL); 918 #endif 919 } 920 921 /* 922 * We keep the driver loaded even when ACPI is not running. 923 * This is needed for the powernow-k8 driver, that works even without 924 * ACPI, but needs symbols from this driver 925 */ 926 927 static int __init acpi_processor_init(void) 928 { 929 int result = 0; 930 931 ACPI_FUNCTION_TRACE("acpi_processor_init"); 932 933 memset(&processors, 0, sizeof(processors)); 934 memset(&errata, 0, sizeof(errata)); 935 936 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 937 if (!acpi_processor_dir) 938 return_VALUE(0); 939 acpi_processor_dir->owner = THIS_MODULE; 940 941 result = acpi_bus_register_driver(&acpi_processor_driver); 942 if (result < 0) { 943 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 944 return_VALUE(0); 945 } 946 947 acpi_processor_install_hotplug_notify(); 948 949 acpi_thermal_cpufreq_init(); 950 951 acpi_processor_ppc_init(); 952 953 return_VALUE(0); 954 } 955 956 static void __exit acpi_processor_exit(void) 957 { 958 ACPI_FUNCTION_TRACE("acpi_processor_exit"); 959 960 acpi_processor_ppc_exit(); 961 962 acpi_thermal_cpufreq_exit(); 963 964 acpi_processor_uninstall_hotplug_notify(); 965 966 acpi_bus_unregister_driver(&acpi_processor_driver); 967 968 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 969 970 return_VOID; 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