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 */ 256 257 int acpi_processor_set_pdc(struct acpi_processor *pr, 258 struct acpi_object_list *pdc_in) 259 { 260 acpi_status status = AE_OK; 261 u32 arg0_buf[3]; 262 union acpi_object arg0 = { ACPI_TYPE_BUFFER }; 263 struct acpi_object_list no_object = { 1, &arg0 }; 264 struct acpi_object_list *pdc; 265 266 ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); 267 268 arg0.buffer.length = 12; 269 arg0.buffer.pointer = (u8 *) arg0_buf; 270 arg0_buf[0] = ACPI_PDC_REVISION_ID; 271 arg0_buf[1] = 0; 272 arg0_buf[2] = 0; 273 274 pdc = (pdc_in) ? pdc_in : &no_object; 275 276 status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); 277 278 if ((ACPI_FAILURE(status)) && (pdc_in)) 279 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 280 "Error evaluating _PDC, using legacy perf. control...\n")); 281 282 return_VALUE(status); 283 } 284 285 /* -------------------------------------------------------------------------- 286 FS Interface (/proc) 287 -------------------------------------------------------------------------- */ 288 289 static struct proc_dir_entry *acpi_processor_dir = NULL; 290 291 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 292 { 293 struct acpi_processor *pr = (struct acpi_processor *)seq->private; 294 295 ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); 296 297 if (!pr) 298 goto end; 299 300 seq_printf(seq, "processor id: %d\n" 301 "acpi id: %d\n" 302 "bus mastering control: %s\n" 303 "power management: %s\n" 304 "throttling control: %s\n" 305 "limit interface: %s\n", 306 pr->id, 307 pr->acpi_id, 308 pr->flags.bm_control ? "yes" : "no", 309 pr->flags.power ? "yes" : "no", 310 pr->flags.throttling ? "yes" : "no", 311 pr->flags.limit ? "yes" : "no"); 312 313 end: 314 return_VALUE(0); 315 } 316 317 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 318 { 319 return single_open(file, acpi_processor_info_seq_show, 320 PDE(inode)->data); 321 } 322 323 static int acpi_processor_add_fs(struct acpi_device *device) 324 { 325 struct proc_dir_entry *entry = NULL; 326 327 ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); 328 329 if (!acpi_device_dir(device)) { 330 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 331 acpi_processor_dir); 332 if (!acpi_device_dir(device)) 333 return_VALUE(-ENODEV); 334 } 335 acpi_device_dir(device)->owner = THIS_MODULE; 336 337 /* 'info' [R] */ 338 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 339 S_IRUGO, acpi_device_dir(device)); 340 if (!entry) 341 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 342 "Unable to create '%s' fs entry\n", 343 ACPI_PROCESSOR_FILE_INFO)); 344 else { 345 entry->proc_fops = &acpi_processor_info_fops; 346 entry->data = acpi_driver_data(device); 347 entry->owner = THIS_MODULE; 348 } 349 350 /* 'throttling' [R/W] */ 351 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 352 S_IFREG | S_IRUGO | S_IWUSR, 353 acpi_device_dir(device)); 354 if (!entry) 355 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 356 "Unable to create '%s' fs entry\n", 357 ACPI_PROCESSOR_FILE_THROTTLING)); 358 else { 359 entry->proc_fops = &acpi_processor_throttling_fops; 360 entry->proc_fops->write = acpi_processor_write_throttling; 361 entry->data = acpi_driver_data(device); 362 entry->owner = THIS_MODULE; 363 } 364 365 /* 'limit' [R/W] */ 366 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 367 S_IFREG | S_IRUGO | S_IWUSR, 368 acpi_device_dir(device)); 369 if (!entry) 370 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 371 "Unable to create '%s' fs entry\n", 372 ACPI_PROCESSOR_FILE_LIMIT)); 373 else { 374 entry->proc_fops = &acpi_processor_limit_fops; 375 entry->proc_fops->write = acpi_processor_write_limit; 376 entry->data = acpi_driver_data(device); 377 entry->owner = THIS_MODULE; 378 } 379 380 return_VALUE(0); 381 } 382 383 static int acpi_processor_remove_fs(struct acpi_device *device) 384 { 385 ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); 386 387 if (acpi_device_dir(device)) { 388 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 389 acpi_device_dir(device)); 390 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 391 acpi_device_dir(device)); 392 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 393 acpi_device_dir(device)); 394 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 395 acpi_device_dir(device) = NULL; 396 } 397 398 return_VALUE(0); 399 } 400 401 /* Use the acpiid in MADT to map cpus in case of SMP */ 402 #ifndef CONFIG_SMP 403 #define convert_acpiid_to_cpu(acpi_id) (0xff) 404 #else 405 406 #ifdef CONFIG_IA64 407 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid 408 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 409 #define ARCH_BAD_APICID (0xffff) 410 #else 411 #define arch_acpiid_to_apicid x86_acpiid_to_apicid 412 #define arch_cpu_to_apicid x86_cpu_to_apicid 413 #define ARCH_BAD_APICID (0xff) 414 #endif 415 416 static u8 convert_acpiid_to_cpu(u8 acpi_id) 417 { 418 u16 apic_id; 419 int i; 420 421 apic_id = arch_acpiid_to_apicid[acpi_id]; 422 if (apic_id == ARCH_BAD_APICID) 423 return -1; 424 425 for (i = 0; i < NR_CPUS; i++) { 426 if (arch_cpu_to_apicid[i] == apic_id) 427 return i; 428 } 429 return -1; 430 } 431 #endif 432 433 /* -------------------------------------------------------------------------- 434 Driver Interface 435 -------------------------------------------------------------------------- */ 436 437 static int acpi_processor_get_info(struct acpi_processor *pr) 438 { 439 acpi_status status = 0; 440 union acpi_object object = { 0 }; 441 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 442 u8 cpu_index; 443 static int cpu0_initialized; 444 445 ACPI_FUNCTION_TRACE("acpi_processor_get_info"); 446 447 if (!pr) 448 return_VALUE(-EINVAL); 449 450 if (num_online_cpus() > 1) 451 errata.smp = TRUE; 452 453 acpi_processor_errata(pr); 454 455 /* 456 * Check to see if we have bus mastering arbitration control. This 457 * is required for proper C3 usage (to maintain cache coherency). 458 */ 459 if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { 460 pr->flags.bm_control = 1; 461 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 462 "Bus mastering arbitration control present\n")); 463 } else 464 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 465 "No bus mastering arbitration control\n")); 466 467 /* 468 * Evalute the processor object. Note that it is common on SMP to 469 * have the first (boot) processor with a valid PBLK address while 470 * all others have a NULL address. 471 */ 472 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 473 if (ACPI_FAILURE(status)) { 474 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 475 "Error evaluating processor object\n")); 476 return_VALUE(-ENODEV); 477 } 478 479 /* 480 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 481 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 482 */ 483 pr->acpi_id = object.processor.proc_id; 484 485 cpu_index = convert_acpiid_to_cpu(pr->acpi_id); 486 487 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 488 if (!cpu0_initialized && (cpu_index == 0xff) && 489 (num_online_cpus() == 1)) { 490 cpu_index = 0; 491 } 492 493 cpu0_initialized = 1; 494 495 pr->id = cpu_index; 496 497 /* 498 * Extra Processor objects may be enumerated on MP systems with 499 * less than the max # of CPUs. They should be ignored _iff 500 * they are physically not present. 501 */ 502 if (cpu_index >= NR_CPUS) { 503 if (ACPI_FAILURE 504 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 505 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 506 "Error getting cpuindex for acpiid 0x%x\n", 507 pr->acpi_id)); 508 return_VALUE(-ENODEV); 509 } 510 } 511 512 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 513 pr->acpi_id)); 514 515 if (!object.processor.pblk_address) 516 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 517 else if (object.processor.pblk_length != 6) 518 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n", 519 object.processor.pblk_length)); 520 else { 521 pr->throttling.address = object.processor.pblk_address; 522 pr->throttling.duty_offset = acpi_fadt.duty_offset; 523 pr->throttling.duty_width = acpi_fadt.duty_width; 524 525 pr->pblk = object.processor.pblk_address; 526 527 /* 528 * We don't care about error returns - we just try to mark 529 * these reserved so that nobody else is confused into thinking 530 * that this region might be unused.. 531 * 532 * (In particular, allocating the IO range for Cardbus) 533 */ 534 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 535 } 536 537 #ifdef CONFIG_CPU_FREQ 538 acpi_processor_ppc_has_changed(pr); 539 #endif 540 acpi_processor_get_throttling_info(pr); 541 acpi_processor_get_limit_info(pr); 542 543 return_VALUE(0); 544 } 545 546 static int acpi_processor_start(struct acpi_device *device) 547 { 548 int result = 0; 549 acpi_status status = AE_OK; 550 struct acpi_processor *pr; 551 552 ACPI_FUNCTION_TRACE("acpi_processor_start"); 553 554 pr = acpi_driver_data(device); 555 556 result = acpi_processor_get_info(pr); 557 if (result) { 558 /* Processor is physically not present */ 559 return_VALUE(0); 560 } 561 562 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 563 564 processors[pr->id] = pr; 565 566 result = acpi_processor_add_fs(device); 567 if (result) 568 goto end; 569 570 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 571 acpi_processor_notify, pr); 572 if (ACPI_FAILURE(status)) { 573 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 574 "Error installing device notify handler\n")); 575 } 576 577 acpi_processor_power_init(pr, device); 578 579 if (pr->flags.throttling) { 580 printk(KERN_INFO PREFIX "%s [%s] (supports", 581 acpi_device_name(device), acpi_device_bid(device)); 582 printk(" %d throttling states", pr->throttling.state_count); 583 printk(")\n"); 584 } 585 586 end: 587 588 return_VALUE(result); 589 } 590 591 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 592 { 593 struct acpi_processor *pr = (struct acpi_processor *)data; 594 struct acpi_device *device = NULL; 595 596 ACPI_FUNCTION_TRACE("acpi_processor_notify"); 597 598 if (!pr) 599 return_VOID; 600 601 if (acpi_bus_get_device(pr->handle, &device)) 602 return_VOID; 603 604 switch (event) { 605 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 606 acpi_processor_ppc_has_changed(pr); 607 acpi_bus_generate_event(device, event, 608 pr->performance_platform_limit); 609 break; 610 case ACPI_PROCESSOR_NOTIFY_POWER: 611 acpi_processor_cst_has_changed(pr); 612 acpi_bus_generate_event(device, event, 0); 613 break; 614 default: 615 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 616 "Unsupported event [0x%x]\n", event)); 617 break; 618 } 619 620 return_VOID; 621 } 622 623 static int acpi_processor_add(struct acpi_device *device) 624 { 625 struct acpi_processor *pr = NULL; 626 627 ACPI_FUNCTION_TRACE("acpi_processor_add"); 628 629 if (!device) 630 return_VALUE(-EINVAL); 631 632 pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); 633 if (!pr) 634 return_VALUE(-ENOMEM); 635 memset(pr, 0, sizeof(struct acpi_processor)); 636 637 pr->handle = device->handle; 638 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 639 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 640 acpi_driver_data(device) = pr; 641 642 return_VALUE(0); 643 } 644 645 static int acpi_processor_remove(struct acpi_device *device, int type) 646 { 647 acpi_status status = AE_OK; 648 struct acpi_processor *pr = NULL; 649 650 ACPI_FUNCTION_TRACE("acpi_processor_remove"); 651 652 if (!device || !acpi_driver_data(device)) 653 return_VALUE(-EINVAL); 654 655 pr = (struct acpi_processor *)acpi_driver_data(device); 656 657 if (pr->id >= NR_CPUS) { 658 kfree(pr); 659 return_VALUE(0); 660 } 661 662 if (type == ACPI_BUS_REMOVAL_EJECT) { 663 if (acpi_processor_handle_eject(pr)) 664 return_VALUE(-EINVAL); 665 } 666 667 acpi_processor_power_exit(pr, device); 668 669 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 670 acpi_processor_notify); 671 if (ACPI_FAILURE(status)) { 672 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 673 "Error removing notify handler\n")); 674 } 675 676 acpi_processor_remove_fs(device); 677 678 processors[pr->id] = NULL; 679 680 kfree(pr); 681 682 return_VALUE(0); 683 } 684 685 #ifdef CONFIG_ACPI_HOTPLUG_CPU 686 /**************************************************************************** 687 * Acpi processor hotplug support * 688 ****************************************************************************/ 689 690 static int is_processor_present(acpi_handle handle); 691 692 static int is_processor_present(acpi_handle handle) 693 { 694 acpi_status status; 695 unsigned long sta = 0; 696 697 ACPI_FUNCTION_TRACE("is_processor_present"); 698 699 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 700 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { 701 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 702 "Processor Device is not present\n")); 703 return_VALUE(0); 704 } 705 return_VALUE(1); 706 } 707 708 static 709 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 710 { 711 acpi_handle phandle; 712 struct acpi_device *pdev; 713 struct acpi_processor *pr; 714 715 ACPI_FUNCTION_TRACE("acpi_processor_device_add"); 716 717 if (acpi_get_parent(handle, &phandle)) { 718 return_VALUE(-ENODEV); 719 } 720 721 if (acpi_bus_get_device(phandle, &pdev)) { 722 return_VALUE(-ENODEV); 723 } 724 725 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 726 return_VALUE(-ENODEV); 727 } 728 729 acpi_bus_start(*device); 730 731 pr = acpi_driver_data(*device); 732 if (!pr) 733 return_VALUE(-ENODEV); 734 735 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 736 kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE); 737 } 738 return_VALUE(0); 739 } 740 741 static void 742 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 743 { 744 struct acpi_processor *pr; 745 struct acpi_device *device = NULL; 746 int result; 747 748 ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); 749 750 switch (event) { 751 case ACPI_NOTIFY_BUS_CHECK: 752 case ACPI_NOTIFY_DEVICE_CHECK: 753 printk("Processor driver received %s event\n", 754 (event == ACPI_NOTIFY_BUS_CHECK) ? 755 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 756 757 if (!is_processor_present(handle)) 758 break; 759 760 if (acpi_bus_get_device(handle, &device)) { 761 result = acpi_processor_device_add(handle, &device); 762 if (result) 763 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 764 "Unable to add the device\n")); 765 break; 766 } 767 768 pr = acpi_driver_data(device); 769 if (!pr) { 770 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 771 "Driver data is NULL\n")); 772 break; 773 } 774 775 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 776 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 777 break; 778 } 779 780 result = acpi_processor_start(device); 781 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 782 kobject_hotplug(&device->kobj, KOBJ_ONLINE); 783 } else { 784 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 785 "Device [%s] failed to start\n", 786 acpi_device_bid(device))); 787 } 788 break; 789 case ACPI_NOTIFY_EJECT_REQUEST: 790 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 791 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 792 793 if (acpi_bus_get_device(handle, &device)) { 794 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 795 "Device don't exist, dropping EJECT\n")); 796 break; 797 } 798 pr = acpi_driver_data(device); 799 if (!pr) { 800 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 801 "Driver data is NULL, dropping EJECT\n")); 802 return_VOID; 803 } 804 805 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 806 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 807 break; 808 default: 809 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 810 "Unsupported event [0x%x]\n", event)); 811 break; 812 } 813 814 return_VOID; 815 } 816 817 static acpi_status 818 processor_walk_namespace_cb(acpi_handle handle, 819 u32 lvl, void *context, void **rv) 820 { 821 acpi_status status; 822 int *action = context; 823 acpi_object_type type = 0; 824 825 status = acpi_get_type(handle, &type); 826 if (ACPI_FAILURE(status)) 827 return (AE_OK); 828 829 if (type != ACPI_TYPE_PROCESSOR) 830 return (AE_OK); 831 832 switch (*action) { 833 case INSTALL_NOTIFY_HANDLER: 834 acpi_install_notify_handler(handle, 835 ACPI_SYSTEM_NOTIFY, 836 acpi_processor_hotplug_notify, 837 NULL); 838 break; 839 case UNINSTALL_NOTIFY_HANDLER: 840 acpi_remove_notify_handler(handle, 841 ACPI_SYSTEM_NOTIFY, 842 acpi_processor_hotplug_notify); 843 break; 844 default: 845 break; 846 } 847 848 return (AE_OK); 849 } 850 851 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 852 { 853 ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); 854 855 if (!is_processor_present(handle)) { 856 return_VALUE(AE_ERROR); 857 } 858 859 if (acpi_map_lsapic(handle, p_cpu)) 860 return_VALUE(AE_ERROR); 861 862 if (arch_register_cpu(*p_cpu)) { 863 acpi_unmap_lsapic(*p_cpu); 864 return_VALUE(AE_ERROR); 865 } 866 867 return_VALUE(AE_OK); 868 } 869 870 static int acpi_processor_handle_eject(struct acpi_processor *pr) 871 { 872 if (cpu_online(pr->id)) { 873 return (-EINVAL); 874 } 875 arch_unregister_cpu(pr->id); 876 acpi_unmap_lsapic(pr->id); 877 return (0); 878 } 879 #else 880 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 881 { 882 return AE_ERROR; 883 } 884 static int acpi_processor_handle_eject(struct acpi_processor *pr) 885 { 886 return (-EINVAL); 887 } 888 #endif 889 890 static 891 void acpi_processor_install_hotplug_notify(void) 892 { 893 #ifdef CONFIG_ACPI_HOTPLUG_CPU 894 int action = INSTALL_NOTIFY_HANDLER; 895 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 896 ACPI_ROOT_OBJECT, 897 ACPI_UINT32_MAX, 898 processor_walk_namespace_cb, &action, NULL); 899 #endif 900 } 901 902 static 903 void acpi_processor_uninstall_hotplug_notify(void) 904 { 905 #ifdef CONFIG_ACPI_HOTPLUG_CPU 906 int action = UNINSTALL_NOTIFY_HANDLER; 907 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 908 ACPI_ROOT_OBJECT, 909 ACPI_UINT32_MAX, 910 processor_walk_namespace_cb, &action, NULL); 911 #endif 912 } 913 914 /* 915 * We keep the driver loaded even when ACPI is not running. 916 * This is needed for the powernow-k8 driver, that works even without 917 * ACPI, but needs symbols from this driver 918 */ 919 920 static int __init acpi_processor_init(void) 921 { 922 int result = 0; 923 924 ACPI_FUNCTION_TRACE("acpi_processor_init"); 925 926 memset(&processors, 0, sizeof(processors)); 927 memset(&errata, 0, sizeof(errata)); 928 929 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 930 if (!acpi_processor_dir) 931 return_VALUE(0); 932 acpi_processor_dir->owner = THIS_MODULE; 933 934 result = acpi_bus_register_driver(&acpi_processor_driver); 935 if (result < 0) { 936 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 937 return_VALUE(0); 938 } 939 940 acpi_processor_install_hotplug_notify(); 941 942 acpi_thermal_cpufreq_init(); 943 944 acpi_processor_ppc_init(); 945 946 return_VALUE(0); 947 } 948 949 static void __exit acpi_processor_exit(void) 950 { 951 ACPI_FUNCTION_TRACE("acpi_processor_exit"); 952 953 acpi_processor_ppc_exit(); 954 955 acpi_thermal_cpufreq_exit(); 956 957 acpi_processor_uninstall_hotplug_notify(); 958 959 acpi_bus_unregister_driver(&acpi_processor_driver); 960 961 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 962 963 return_VOID; 964 } 965 966 module_init(acpi_processor_init); 967 module_exit(acpi_processor_exit); 968 969 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 970 971 MODULE_ALIAS("processor"); 972