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_DEVICE_NAME "Processor" 64 #define ACPI_PROCESSOR_FILE_INFO "info" 65 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 66 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 67 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 68 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 69 70 #define ACPI_PROCESSOR_LIMIT_USER 0 71 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 72 73 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 74 ACPI_MODULE_NAME("processor_core"); 75 76 MODULE_AUTHOR("Paul Diefenbaugh"); 77 MODULE_DESCRIPTION("ACPI Processor Driver"); 78 MODULE_LICENSE("GPL"); 79 80 static int acpi_processor_add(struct acpi_device *device); 81 static int acpi_processor_start(struct acpi_device *device); 82 static int acpi_processor_remove(struct acpi_device *device, int type); 83 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 84 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 85 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 86 static int acpi_processor_handle_eject(struct acpi_processor *pr); 87 88 static struct acpi_driver acpi_processor_driver = { 89 .name = "processor", 90 .class = ACPI_PROCESSOR_CLASS, 91 .ids = ACPI_PROCESSOR_HID, 92 .ops = { 93 .add = acpi_processor_add, 94 .remove = acpi_processor_remove, 95 .start = acpi_processor_start, 96 }, 97 }; 98 99 #define INSTALL_NOTIFY_HANDLER 1 100 #define UNINSTALL_NOTIFY_HANDLER 2 101 102 static const struct file_operations acpi_processor_info_fops = { 103 .open = acpi_processor_info_open_fs, 104 .read = seq_read, 105 .llseek = seq_lseek, 106 .release = single_release, 107 }; 108 109 struct acpi_processor *processors[NR_CPUS]; 110 struct acpi_processor_errata errata __read_mostly; 111 112 /* -------------------------------------------------------------------------- 113 Errata Handling 114 -------------------------------------------------------------------------- */ 115 116 static int acpi_processor_errata_piix4(struct pci_dev *dev) 117 { 118 u8 value1 = 0; 119 u8 value2 = 0; 120 121 122 if (!dev) 123 return -EINVAL; 124 125 /* 126 * Note that 'dev' references the PIIX4 ACPI Controller. 127 */ 128 129 switch (dev->revision) { 130 case 0: 131 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 132 break; 133 case 1: 134 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 135 break; 136 case 2: 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 138 break; 139 case 3: 140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 141 break; 142 default: 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 144 break; 145 } 146 147 switch (dev->revision) { 148 149 case 0: /* PIIX4 A-step */ 150 case 1: /* PIIX4 B-step */ 151 /* 152 * See specification changes #13 ("Manual Throttle Duty Cycle") 153 * and #14 ("Enabling and Disabling Manual Throttle"), plus 154 * erratum #5 ("STPCLK# Deassertion Time") from the January 155 * 2002 PIIX4 specification update. Applies to only older 156 * PIIX4 models. 157 */ 158 errata.piix4.throttle = 1; 159 160 case 2: /* PIIX4E */ 161 case 3: /* PIIX4M */ 162 /* 163 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 164 * Livelock") from the January 2002 PIIX4 specification update. 165 * Applies to all PIIX4 models. 166 */ 167 168 /* 169 * BM-IDE 170 * ------ 171 * Find the PIIX4 IDE Controller and get the Bus Master IDE 172 * Status register address. We'll use this later to read 173 * each IDE controller's DMA status to make sure we catch all 174 * DMA activity. 175 */ 176 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 177 PCI_DEVICE_ID_INTEL_82371AB, 178 PCI_ANY_ID, PCI_ANY_ID, NULL); 179 if (dev) { 180 errata.piix4.bmisx = pci_resource_start(dev, 4); 181 pci_dev_put(dev); 182 } 183 184 /* 185 * Type-F DMA 186 * ---------- 187 * Find the PIIX4 ISA Controller and read the Motherboard 188 * DMA controller's status to see if Type-F (Fast) DMA mode 189 * is enabled (bit 7) on either channel. Note that we'll 190 * disable C3 support if this is enabled, as some legacy 191 * devices won't operate well if fast DMA is disabled. 192 */ 193 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 194 PCI_DEVICE_ID_INTEL_82371AB_0, 195 PCI_ANY_ID, PCI_ANY_ID, NULL); 196 if (dev) { 197 pci_read_config_byte(dev, 0x76, &value1); 198 pci_read_config_byte(dev, 0x77, &value2); 199 if ((value1 & 0x80) || (value2 & 0x80)) 200 errata.piix4.fdma = 1; 201 pci_dev_put(dev); 202 } 203 204 break; 205 } 206 207 if (errata.piix4.bmisx) 208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 209 "Bus master activity detection (BM-IDE) erratum enabled\n")); 210 if (errata.piix4.fdma) 211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 212 "Type-F DMA livelock erratum (C3 disabled)\n")); 213 214 return 0; 215 } 216 217 static int acpi_processor_errata(struct acpi_processor *pr) 218 { 219 int result = 0; 220 struct pci_dev *dev = NULL; 221 222 223 if (!pr) 224 return -EINVAL; 225 226 /* 227 * PIIX4 228 */ 229 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 230 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 231 PCI_ANY_ID, NULL); 232 if (dev) { 233 result = acpi_processor_errata_piix4(dev); 234 pci_dev_put(dev); 235 } 236 237 return result; 238 } 239 240 /* -------------------------------------------------------------------------- 241 Common ACPI processor functions 242 -------------------------------------------------------------------------- */ 243 244 /* 245 * _PDC is required for a BIOS-OS handshake for most of the newer 246 * ACPI processor features. 247 */ 248 static int acpi_processor_set_pdc(struct acpi_processor *pr) 249 { 250 struct acpi_object_list *pdc_in = pr->pdc; 251 acpi_status status = AE_OK; 252 253 254 if (!pdc_in) 255 return status; 256 257 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 258 259 if (ACPI_FAILURE(status)) 260 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 261 "Could not evaluate _PDC, using legacy perf. control...\n")); 262 263 return status; 264 } 265 266 /* -------------------------------------------------------------------------- 267 FS Interface (/proc) 268 -------------------------------------------------------------------------- */ 269 270 static struct proc_dir_entry *acpi_processor_dir = NULL; 271 272 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 273 { 274 struct acpi_processor *pr = seq->private; 275 276 277 if (!pr) 278 goto end; 279 280 seq_printf(seq, "processor id: %d\n" 281 "acpi id: %d\n" 282 "bus mastering control: %s\n" 283 "power management: %s\n" 284 "throttling control: %s\n" 285 "limit interface: %s\n", 286 pr->id, 287 pr->acpi_id, 288 pr->flags.bm_control ? "yes" : "no", 289 pr->flags.power ? "yes" : "no", 290 pr->flags.throttling ? "yes" : "no", 291 pr->flags.limit ? "yes" : "no"); 292 293 end: 294 return 0; 295 } 296 297 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 298 { 299 return single_open(file, acpi_processor_info_seq_show, 300 PDE(inode)->data); 301 } 302 303 static int acpi_processor_add_fs(struct acpi_device *device) 304 { 305 struct proc_dir_entry *entry = NULL; 306 307 308 if (!acpi_device_dir(device)) { 309 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 310 acpi_processor_dir); 311 if (!acpi_device_dir(device)) 312 return -ENODEV; 313 } 314 acpi_device_dir(device)->owner = THIS_MODULE; 315 316 /* 'info' [R] */ 317 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 318 S_IRUGO, acpi_device_dir(device)); 319 if (!entry) 320 return -EIO; 321 else { 322 entry->proc_fops = &acpi_processor_info_fops; 323 entry->data = acpi_driver_data(device); 324 entry->owner = THIS_MODULE; 325 } 326 327 /* 'throttling' [R/W] */ 328 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 329 S_IFREG | S_IRUGO | S_IWUSR, 330 acpi_device_dir(device)); 331 if (!entry) 332 return -EIO; 333 else { 334 entry->proc_fops = &acpi_processor_throttling_fops; 335 entry->data = acpi_driver_data(device); 336 entry->owner = THIS_MODULE; 337 } 338 339 /* 'limit' [R/W] */ 340 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 341 S_IFREG | S_IRUGO | S_IWUSR, 342 acpi_device_dir(device)); 343 if (!entry) 344 return -EIO; 345 else { 346 entry->proc_fops = &acpi_processor_limit_fops; 347 entry->data = acpi_driver_data(device); 348 entry->owner = THIS_MODULE; 349 } 350 351 return 0; 352 } 353 354 static int acpi_processor_remove_fs(struct acpi_device *device) 355 { 356 357 if (acpi_device_dir(device)) { 358 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 359 acpi_device_dir(device)); 360 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 361 acpi_device_dir(device)); 362 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 363 acpi_device_dir(device)); 364 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 365 acpi_device_dir(device) = NULL; 366 } 367 368 return 0; 369 } 370 371 /* Use the acpiid in MADT to map cpus in case of SMP */ 372 373 #ifndef CONFIG_SMP 374 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;} 375 #else 376 377 static struct acpi_table_madt *madt; 378 379 static int map_lapic_id(struct acpi_subtable_header *entry, 380 u32 acpi_id, int *apic_id) 381 { 382 struct acpi_madt_local_apic *lapic = 383 (struct acpi_madt_local_apic *)entry; 384 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 385 lapic->processor_id == acpi_id) { 386 *apic_id = lapic->id; 387 return 1; 388 } 389 return 0; 390 } 391 392 static int map_lsapic_id(struct acpi_subtable_header *entry, 393 u32 acpi_id, int *apic_id) 394 { 395 struct acpi_madt_local_sapic *lsapic = 396 (struct acpi_madt_local_sapic *)entry; 397 /* Only check enabled APICs*/ 398 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 399 /* First check against id */ 400 if (lsapic->processor_id == acpi_id) { 401 *apic_id = (lsapic->id << 8) | lsapic->eid; 402 return 1; 403 /* Check against optional uid */ 404 } else if (entry->length >= 16 && 405 lsapic->uid == acpi_id) { 406 *apic_id = lsapic->uid; 407 return 1; 408 } 409 } 410 return 0; 411 } 412 413 #ifdef CONFIG_IA64 414 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 415 #else 416 #define arch_cpu_to_apicid x86_cpu_to_apicid 417 #endif 418 419 static int map_madt_entry(u32 acpi_id) 420 { 421 unsigned long madt_end, entry; 422 int apic_id = -1; 423 424 if (!madt) 425 return apic_id; 426 427 entry = (unsigned long)madt; 428 madt_end = entry + madt->header.length; 429 430 /* Parse all entries looking for a match. */ 431 432 entry += sizeof(struct acpi_table_madt); 433 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 434 struct acpi_subtable_header *header = 435 (struct acpi_subtable_header *)entry; 436 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 437 if (map_lapic_id(header, acpi_id, &apic_id)) 438 break; 439 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 440 if (map_lsapic_id(header, acpi_id, &apic_id)) 441 break; 442 } 443 entry += header->length; 444 } 445 return apic_id; 446 } 447 448 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 449 { 450 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 451 union acpi_object *obj; 452 struct acpi_subtable_header *header; 453 int apic_id = -1; 454 455 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 456 goto exit; 457 458 if (!buffer.length || !buffer.pointer) 459 goto exit; 460 461 obj = buffer.pointer; 462 if (obj->type != ACPI_TYPE_BUFFER || 463 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 464 goto exit; 465 } 466 467 header = (struct acpi_subtable_header *)obj->buffer.pointer; 468 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 469 map_lapic_id(header, acpi_id, &apic_id); 470 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 471 map_lsapic_id(header, acpi_id, &apic_id); 472 } 473 474 exit: 475 if (buffer.pointer) 476 kfree(buffer.pointer); 477 return apic_id; 478 } 479 480 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 481 { 482 int i; 483 int apic_id = -1; 484 485 apic_id = map_mat_entry(handle, acpi_id); 486 if (apic_id == -1) 487 apic_id = map_madt_entry(acpi_id); 488 if (apic_id == -1) 489 return apic_id; 490 491 for (i = 0; i < NR_CPUS; ++i) { 492 if (arch_cpu_to_apicid[i] == apic_id) 493 return i; 494 } 495 return -1; 496 } 497 #endif 498 499 /* -------------------------------------------------------------------------- 500 Driver Interface 501 -------------------------------------------------------------------------- */ 502 503 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 504 { 505 acpi_status status = 0; 506 union acpi_object object = { 0 }; 507 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 508 int cpu_index; 509 static int cpu0_initialized; 510 511 512 if (!pr) 513 return -EINVAL; 514 515 if (num_online_cpus() > 1) 516 errata.smp = TRUE; 517 518 acpi_processor_errata(pr); 519 520 /* 521 * Check to see if we have bus mastering arbitration control. This 522 * is required for proper C3 usage (to maintain cache coherency). 523 */ 524 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 525 pr->flags.bm_control = 1; 526 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 527 "Bus mastering arbitration control present\n")); 528 } else 529 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 530 "No bus mastering arbitration control\n")); 531 532 /* Check if it is a Device with HID and UID */ 533 if (has_uid) { 534 unsigned long value; 535 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 536 NULL, &value); 537 if (ACPI_FAILURE(status)) { 538 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 539 return -ENODEV; 540 } 541 pr->acpi_id = value; 542 } else { 543 /* 544 * Evalute the processor object. Note that it is common on SMP to 545 * have the first (boot) processor with a valid PBLK address while 546 * all others have a NULL address. 547 */ 548 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 549 if (ACPI_FAILURE(status)) { 550 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 551 return -ENODEV; 552 } 553 554 /* 555 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 556 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 557 */ 558 pr->acpi_id = object.processor.proc_id; 559 } 560 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 561 562 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 563 if (!cpu0_initialized && (cpu_index == -1) && 564 (num_online_cpus() == 1)) { 565 cpu_index = 0; 566 } 567 568 cpu0_initialized = 1; 569 570 pr->id = cpu_index; 571 572 /* 573 * Extra Processor objects may be enumerated on MP systems with 574 * less than the max # of CPUs. They should be ignored _iff 575 * they are physically not present. 576 */ 577 if (pr->id == -1) { 578 if (ACPI_FAILURE 579 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 580 return -ENODEV; 581 } 582 } 583 584 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 585 pr->acpi_id)); 586 587 if (!object.processor.pblk_address) 588 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 589 else if (object.processor.pblk_length != 6) 590 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 591 object.processor.pblk_length); 592 else { 593 pr->throttling.address = object.processor.pblk_address; 594 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 595 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 596 597 pr->pblk = object.processor.pblk_address; 598 599 /* 600 * We don't care about error returns - we just try to mark 601 * these reserved so that nobody else is confused into thinking 602 * that this region might be unused.. 603 * 604 * (In particular, allocating the IO range for Cardbus) 605 */ 606 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 607 } 608 609 #ifdef CONFIG_CPU_FREQ 610 acpi_processor_ppc_has_changed(pr); 611 #endif 612 acpi_processor_get_throttling_info(pr); 613 acpi_processor_get_limit_info(pr); 614 615 return 0; 616 } 617 618 static void *processor_device_array[NR_CPUS]; 619 620 static int __cpuinit acpi_processor_start(struct acpi_device *device) 621 { 622 int result = 0; 623 acpi_status status = AE_OK; 624 struct acpi_processor *pr; 625 626 627 pr = acpi_driver_data(device); 628 629 result = acpi_processor_get_info(pr, device->flags.unique_id); 630 if (result) { 631 /* Processor is physically not present */ 632 return 0; 633 } 634 635 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 636 637 /* 638 * Buggy BIOS check 639 * ACPI id of processors can be reported wrongly by the BIOS. 640 * Don't trust it blindly 641 */ 642 if (processor_device_array[pr->id] != NULL && 643 processor_device_array[pr->id] != device) { 644 printk(KERN_WARNING "BIOS reported wrong ACPI id" 645 "for the processor\n"); 646 return -ENODEV; 647 } 648 processor_device_array[pr->id] = device; 649 650 processors[pr->id] = pr; 651 652 result = acpi_processor_add_fs(device); 653 if (result) 654 goto end; 655 656 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 657 acpi_processor_notify, pr); 658 659 /* _PDC call should be done before doing anything else (if reqd.). */ 660 arch_acpi_processor_init_pdc(pr); 661 acpi_processor_set_pdc(pr); 662 663 acpi_processor_power_init(pr, device); 664 665 if (pr->flags.throttling) { 666 printk(KERN_INFO PREFIX "%s [%s] (supports", 667 acpi_device_name(device), acpi_device_bid(device)); 668 printk(" %d throttling states", pr->throttling.state_count); 669 printk(")\n"); 670 } 671 672 end: 673 674 return result; 675 } 676 677 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 678 { 679 struct acpi_processor *pr = data; 680 struct acpi_device *device = NULL; 681 682 683 if (!pr) 684 return; 685 686 if (acpi_bus_get_device(pr->handle, &device)) 687 return; 688 689 switch (event) { 690 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 691 acpi_processor_ppc_has_changed(pr); 692 acpi_bus_generate_event(device, event, 693 pr->performance_platform_limit); 694 break; 695 case ACPI_PROCESSOR_NOTIFY_POWER: 696 acpi_processor_cst_has_changed(pr); 697 acpi_bus_generate_event(device, event, 0); 698 break; 699 default: 700 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 701 "Unsupported event [0x%x]\n", event)); 702 break; 703 } 704 705 return; 706 } 707 708 static int acpi_processor_add(struct acpi_device *device) 709 { 710 struct acpi_processor *pr = NULL; 711 712 713 if (!device) 714 return -EINVAL; 715 716 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 717 if (!pr) 718 return -ENOMEM; 719 720 pr->handle = device->handle; 721 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 722 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 723 acpi_driver_data(device) = pr; 724 725 return 0; 726 } 727 728 static int acpi_processor_remove(struct acpi_device *device, int type) 729 { 730 acpi_status status = AE_OK; 731 struct acpi_processor *pr = NULL; 732 733 734 if (!device || !acpi_driver_data(device)) 735 return -EINVAL; 736 737 pr = acpi_driver_data(device); 738 739 if (pr->id >= NR_CPUS) { 740 kfree(pr); 741 return 0; 742 } 743 744 if (type == ACPI_BUS_REMOVAL_EJECT) { 745 if (acpi_processor_handle_eject(pr)) 746 return -EINVAL; 747 } 748 749 acpi_processor_power_exit(pr, device); 750 751 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 752 acpi_processor_notify); 753 754 acpi_processor_remove_fs(device); 755 756 processors[pr->id] = NULL; 757 758 kfree(pr); 759 760 return 0; 761 } 762 763 #ifdef CONFIG_ACPI_HOTPLUG_CPU 764 /**************************************************************************** 765 * Acpi processor hotplug support * 766 ****************************************************************************/ 767 768 static int is_processor_present(acpi_handle handle); 769 770 static int is_processor_present(acpi_handle handle) 771 { 772 acpi_status status; 773 unsigned long sta = 0; 774 775 776 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 777 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) { 778 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 779 return 0; 780 } 781 return 1; 782 } 783 784 static 785 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 786 { 787 acpi_handle phandle; 788 struct acpi_device *pdev; 789 struct acpi_processor *pr; 790 791 792 if (acpi_get_parent(handle, &phandle)) { 793 return -ENODEV; 794 } 795 796 if (acpi_bus_get_device(phandle, &pdev)) { 797 return -ENODEV; 798 } 799 800 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 801 return -ENODEV; 802 } 803 804 acpi_bus_start(*device); 805 806 pr = acpi_driver_data(*device); 807 if (!pr) 808 return -ENODEV; 809 810 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 811 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 812 } 813 return 0; 814 } 815 816 static void 817 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 818 { 819 struct acpi_processor *pr; 820 struct acpi_device *device = NULL; 821 int result; 822 823 824 switch (event) { 825 case ACPI_NOTIFY_BUS_CHECK: 826 case ACPI_NOTIFY_DEVICE_CHECK: 827 printk("Processor driver received %s event\n", 828 (event == ACPI_NOTIFY_BUS_CHECK) ? 829 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 830 831 if (!is_processor_present(handle)) 832 break; 833 834 if (acpi_bus_get_device(handle, &device)) { 835 result = acpi_processor_device_add(handle, &device); 836 if (result) 837 printk(KERN_ERR PREFIX 838 "Unable to add the device\n"); 839 break; 840 } 841 842 pr = acpi_driver_data(device); 843 if (!pr) { 844 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 845 break; 846 } 847 848 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 849 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 850 break; 851 } 852 853 result = acpi_processor_start(device); 854 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 855 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 856 } else { 857 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 858 acpi_device_bid(device)); 859 } 860 break; 861 case ACPI_NOTIFY_EJECT_REQUEST: 862 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 863 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 864 865 if (acpi_bus_get_device(handle, &device)) { 866 printk(KERN_ERR PREFIX 867 "Device don't exist, dropping EJECT\n"); 868 break; 869 } 870 pr = acpi_driver_data(device); 871 if (!pr) { 872 printk(KERN_ERR PREFIX 873 "Driver data is NULL, dropping EJECT\n"); 874 return; 875 } 876 877 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 878 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 879 break; 880 default: 881 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 882 "Unsupported event [0x%x]\n", event)); 883 break; 884 } 885 886 return; 887 } 888 889 static acpi_status 890 processor_walk_namespace_cb(acpi_handle handle, 891 u32 lvl, void *context, void **rv) 892 { 893 acpi_status status; 894 int *action = context; 895 acpi_object_type type = 0; 896 897 status = acpi_get_type(handle, &type); 898 if (ACPI_FAILURE(status)) 899 return (AE_OK); 900 901 if (type != ACPI_TYPE_PROCESSOR) 902 return (AE_OK); 903 904 switch (*action) { 905 case INSTALL_NOTIFY_HANDLER: 906 acpi_install_notify_handler(handle, 907 ACPI_SYSTEM_NOTIFY, 908 acpi_processor_hotplug_notify, 909 NULL); 910 break; 911 case UNINSTALL_NOTIFY_HANDLER: 912 acpi_remove_notify_handler(handle, 913 ACPI_SYSTEM_NOTIFY, 914 acpi_processor_hotplug_notify); 915 break; 916 default: 917 break; 918 } 919 920 return (AE_OK); 921 } 922 923 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 924 { 925 926 if (!is_processor_present(handle)) { 927 return AE_ERROR; 928 } 929 930 if (acpi_map_lsapic(handle, p_cpu)) 931 return AE_ERROR; 932 933 if (arch_register_cpu(*p_cpu)) { 934 acpi_unmap_lsapic(*p_cpu); 935 return AE_ERROR; 936 } 937 938 return AE_OK; 939 } 940 941 static int acpi_processor_handle_eject(struct acpi_processor *pr) 942 { 943 if (cpu_online(pr->id)) { 944 return (-EINVAL); 945 } 946 arch_unregister_cpu(pr->id); 947 acpi_unmap_lsapic(pr->id); 948 return (0); 949 } 950 #else 951 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 952 { 953 return AE_ERROR; 954 } 955 static int acpi_processor_handle_eject(struct acpi_processor *pr) 956 { 957 return (-EINVAL); 958 } 959 #endif 960 961 static 962 void acpi_processor_install_hotplug_notify(void) 963 { 964 #ifdef CONFIG_ACPI_HOTPLUG_CPU 965 int action = INSTALL_NOTIFY_HANDLER; 966 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 967 ACPI_ROOT_OBJECT, 968 ACPI_UINT32_MAX, 969 processor_walk_namespace_cb, &action, NULL); 970 #endif 971 } 972 973 static 974 void acpi_processor_uninstall_hotplug_notify(void) 975 { 976 #ifdef CONFIG_ACPI_HOTPLUG_CPU 977 int action = UNINSTALL_NOTIFY_HANDLER; 978 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 979 ACPI_ROOT_OBJECT, 980 ACPI_UINT32_MAX, 981 processor_walk_namespace_cb, &action, NULL); 982 #endif 983 } 984 985 /* 986 * We keep the driver loaded even when ACPI is not running. 987 * This is needed for the powernow-k8 driver, that works even without 988 * ACPI, but needs symbols from this driver 989 */ 990 991 static int __init acpi_processor_init(void) 992 { 993 int result = 0; 994 995 996 memset(&processors, 0, sizeof(processors)); 997 memset(&errata, 0, sizeof(errata)); 998 999 #ifdef CONFIG_SMP 1000 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1001 (struct acpi_table_header **)&madt))) 1002 madt = NULL; 1003 #endif 1004 1005 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1006 if (!acpi_processor_dir) 1007 return -ENOMEM; 1008 acpi_processor_dir->owner = THIS_MODULE; 1009 1010 result = acpi_bus_register_driver(&acpi_processor_driver); 1011 if (result < 0) { 1012 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1013 return result; 1014 } 1015 1016 acpi_processor_install_hotplug_notify(); 1017 1018 acpi_thermal_cpufreq_init(); 1019 1020 acpi_processor_ppc_init(); 1021 1022 return 0; 1023 } 1024 1025 static void __exit acpi_processor_exit(void) 1026 { 1027 1028 acpi_processor_ppc_exit(); 1029 1030 acpi_thermal_cpufreq_exit(); 1031 1032 acpi_processor_uninstall_hotplug_notify(); 1033 1034 acpi_bus_unregister_driver(&acpi_processor_driver); 1035 1036 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1037 1038 return; 1039 } 1040 1041 module_init(acpi_processor_init); 1042 module_exit(acpi_processor_exit); 1043 1044 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1045 1046 MODULE_ALIAS("processor"); 1047