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 rev = 0; 119 u8 value1 = 0; 120 u8 value2 = 0; 121 122 123 if (!dev) 124 return -EINVAL; 125 126 /* 127 * Note that 'dev' references the PIIX4 ACPI Controller. 128 */ 129 130 pci_read_config_byte(dev, PCI_REVISION_ID, &rev); 131 132 switch (rev) { 133 case 0: 134 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 135 break; 136 case 1: 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 138 break; 139 case 2: 140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 141 break; 142 case 3: 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 144 break; 145 default: 146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 147 break; 148 } 149 150 switch (rev) { 151 152 case 0: /* PIIX4 A-step */ 153 case 1: /* PIIX4 B-step */ 154 /* 155 * See specification changes #13 ("Manual Throttle Duty Cycle") 156 * and #14 ("Enabling and Disabling Manual Throttle"), plus 157 * erratum #5 ("STPCLK# Deassertion Time") from the January 158 * 2002 PIIX4 specification update. Applies to only older 159 * PIIX4 models. 160 */ 161 errata.piix4.throttle = 1; 162 163 case 2: /* PIIX4E */ 164 case 3: /* PIIX4M */ 165 /* 166 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 167 * Livelock") from the January 2002 PIIX4 specification update. 168 * Applies to all PIIX4 models. 169 */ 170 171 /* 172 * BM-IDE 173 * ------ 174 * Find the PIIX4 IDE Controller and get the Bus Master IDE 175 * Status register address. We'll use this later to read 176 * each IDE controller's DMA status to make sure we catch all 177 * DMA activity. 178 */ 179 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 180 PCI_DEVICE_ID_INTEL_82371AB, 181 PCI_ANY_ID, PCI_ANY_ID, NULL); 182 if (dev) { 183 errata.piix4.bmisx = pci_resource_start(dev, 4); 184 pci_dev_put(dev); 185 } 186 187 /* 188 * Type-F DMA 189 * ---------- 190 * Find the PIIX4 ISA Controller and read the Motherboard 191 * DMA controller's status to see if Type-F (Fast) DMA mode 192 * is enabled (bit 7) on either channel. Note that we'll 193 * disable C3 support if this is enabled, as some legacy 194 * devices won't operate well if fast DMA is disabled. 195 */ 196 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 197 PCI_DEVICE_ID_INTEL_82371AB_0, 198 PCI_ANY_ID, PCI_ANY_ID, NULL); 199 if (dev) { 200 pci_read_config_byte(dev, 0x76, &value1); 201 pci_read_config_byte(dev, 0x77, &value2); 202 if ((value1 & 0x80) || (value2 & 0x80)) 203 errata.piix4.fdma = 1; 204 pci_dev_put(dev); 205 } 206 207 break; 208 } 209 210 if (errata.piix4.bmisx) 211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 212 "Bus master activity detection (BM-IDE) erratum enabled\n")); 213 if (errata.piix4.fdma) 214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 215 "Type-F DMA livelock erratum (C3 disabled)\n")); 216 217 return 0; 218 } 219 220 static int acpi_processor_errata(struct acpi_processor *pr) 221 { 222 int result = 0; 223 struct pci_dev *dev = NULL; 224 225 226 if (!pr) 227 return -EINVAL; 228 229 /* 230 * PIIX4 231 */ 232 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 233 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 234 PCI_ANY_ID, NULL); 235 if (dev) { 236 result = acpi_processor_errata_piix4(dev); 237 pci_dev_put(dev); 238 } 239 240 return result; 241 } 242 243 /* -------------------------------------------------------------------------- 244 Common ACPI processor functions 245 -------------------------------------------------------------------------- */ 246 247 /* 248 * _PDC is required for a BIOS-OS handshake for most of the newer 249 * ACPI processor features. 250 */ 251 static int acpi_processor_set_pdc(struct acpi_processor *pr) 252 { 253 struct acpi_object_list *pdc_in = pr->pdc; 254 acpi_status status = AE_OK; 255 256 257 if (!pdc_in) 258 return status; 259 260 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 261 262 if (ACPI_FAILURE(status)) 263 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 264 "Could not evaluate _PDC, using legacy perf. control...\n")); 265 266 return status; 267 } 268 269 /* -------------------------------------------------------------------------- 270 FS Interface (/proc) 271 -------------------------------------------------------------------------- */ 272 273 static struct proc_dir_entry *acpi_processor_dir = NULL; 274 275 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 276 { 277 struct acpi_processor *pr = seq->private; 278 279 280 if (!pr) 281 goto end; 282 283 seq_printf(seq, "processor id: %d\n" 284 "acpi id: %d\n" 285 "bus mastering control: %s\n" 286 "power management: %s\n" 287 "throttling control: %s\n" 288 "limit interface: %s\n", 289 pr->id, 290 pr->acpi_id, 291 pr->flags.bm_control ? "yes" : "no", 292 pr->flags.power ? "yes" : "no", 293 pr->flags.throttling ? "yes" : "no", 294 pr->flags.limit ? "yes" : "no"); 295 296 end: 297 return 0; 298 } 299 300 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 301 { 302 return single_open(file, acpi_processor_info_seq_show, 303 PDE(inode)->data); 304 } 305 306 static int acpi_processor_add_fs(struct acpi_device *device) 307 { 308 struct proc_dir_entry *entry = NULL; 309 310 311 if (!acpi_device_dir(device)) { 312 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 313 acpi_processor_dir); 314 if (!acpi_device_dir(device)) 315 return -ENODEV; 316 } 317 acpi_device_dir(device)->owner = THIS_MODULE; 318 319 /* 'info' [R] */ 320 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 321 S_IRUGO, acpi_device_dir(device)); 322 if (!entry) 323 return -EIO; 324 else { 325 entry->proc_fops = &acpi_processor_info_fops; 326 entry->data = acpi_driver_data(device); 327 entry->owner = THIS_MODULE; 328 } 329 330 /* 'throttling' [R/W] */ 331 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 332 S_IFREG | S_IRUGO | S_IWUSR, 333 acpi_device_dir(device)); 334 if (!entry) 335 return -EIO; 336 else { 337 entry->proc_fops = &acpi_processor_throttling_fops; 338 entry->data = acpi_driver_data(device); 339 entry->owner = THIS_MODULE; 340 } 341 342 /* 'limit' [R/W] */ 343 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 344 S_IFREG | S_IRUGO | S_IWUSR, 345 acpi_device_dir(device)); 346 if (!entry) 347 return -EIO; 348 else { 349 entry->proc_fops = &acpi_processor_limit_fops; 350 entry->data = acpi_driver_data(device); 351 entry->owner = THIS_MODULE; 352 } 353 354 return 0; 355 } 356 357 static int acpi_processor_remove_fs(struct acpi_device *device) 358 { 359 360 if (acpi_device_dir(device)) { 361 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 362 acpi_device_dir(device)); 363 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 364 acpi_device_dir(device)); 365 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 366 acpi_device_dir(device)); 367 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 368 acpi_device_dir(device) = NULL; 369 } 370 371 return 0; 372 } 373 374 /* Use the acpiid in MADT to map cpus in case of SMP */ 375 376 #ifndef CONFIG_SMP 377 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;} 378 #else 379 380 static struct acpi_table_madt *madt; 381 382 static int map_lapic_id(struct acpi_subtable_header *entry, 383 u32 acpi_id, int *apic_id) 384 { 385 struct acpi_madt_local_apic *lapic = 386 (struct acpi_madt_local_apic *)entry; 387 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 388 lapic->processor_id == acpi_id) { 389 *apic_id = lapic->id; 390 return 1; 391 } 392 return 0; 393 } 394 395 static int map_lsapic_id(struct acpi_subtable_header *entry, 396 u32 acpi_id, int *apic_id) 397 { 398 struct acpi_madt_local_sapic *lsapic = 399 (struct acpi_madt_local_sapic *)entry; 400 /* Only check enabled APICs*/ 401 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 402 /* First check against id */ 403 if (lsapic->processor_id == acpi_id) { 404 *apic_id = (lsapic->id << 8) | lsapic->eid; 405 return 1; 406 /* Check against optional uid */ 407 } else if (entry->length >= 16 && 408 lsapic->uid == acpi_id) { 409 *apic_id = lsapic->uid; 410 return 1; 411 } 412 } 413 return 0; 414 } 415 416 #ifdef CONFIG_IA64 417 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 418 #else 419 #define arch_cpu_to_apicid x86_cpu_to_apicid 420 #endif 421 422 static int map_madt_entry(u32 acpi_id) 423 { 424 unsigned long madt_end, entry; 425 int apic_id = -1; 426 427 if (!madt) 428 return apic_id; 429 430 entry = (unsigned long)madt; 431 madt_end = entry + madt->header.length; 432 433 /* Parse all entries looking for a match. */ 434 435 entry += sizeof(struct acpi_table_madt); 436 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 437 struct acpi_subtable_header *header = 438 (struct acpi_subtable_header *)entry; 439 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 440 if (map_lapic_id(header, acpi_id, &apic_id)) 441 break; 442 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 443 if (map_lsapic_id(header, acpi_id, &apic_id)) 444 break; 445 } 446 entry += header->length; 447 } 448 return apic_id; 449 } 450 451 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 452 { 453 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 454 union acpi_object *obj; 455 struct acpi_subtable_header *header; 456 int apic_id = -1; 457 458 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 459 goto exit; 460 461 if (!buffer.length || !buffer.pointer) 462 goto exit; 463 464 obj = buffer.pointer; 465 if (obj->type != ACPI_TYPE_BUFFER || 466 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 467 goto exit; 468 } 469 470 header = (struct acpi_subtable_header *)obj->buffer.pointer; 471 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 472 map_lapic_id(header, acpi_id, &apic_id); 473 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 474 map_lsapic_id(header, acpi_id, &apic_id); 475 } 476 477 exit: 478 if (buffer.pointer) 479 kfree(buffer.pointer); 480 return apic_id; 481 } 482 483 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 484 { 485 int i; 486 int apic_id = -1; 487 488 apic_id = map_mat_entry(handle, acpi_id); 489 if (apic_id == -1) 490 apic_id = map_madt_entry(acpi_id); 491 if (apic_id == -1) 492 return apic_id; 493 494 for (i = 0; i < NR_CPUS; ++i) { 495 if (arch_cpu_to_apicid[i] == apic_id) 496 return i; 497 } 498 return -1; 499 } 500 #endif 501 502 /* -------------------------------------------------------------------------- 503 Driver Interface 504 -------------------------------------------------------------------------- */ 505 506 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 507 { 508 acpi_status status = 0; 509 union acpi_object object = { 0 }; 510 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 511 int cpu_index; 512 static int cpu0_initialized; 513 514 515 if (!pr) 516 return -EINVAL; 517 518 if (num_online_cpus() > 1) 519 errata.smp = TRUE; 520 521 acpi_processor_errata(pr); 522 523 /* 524 * Check to see if we have bus mastering arbitration control. This 525 * is required for proper C3 usage (to maintain cache coherency). 526 */ 527 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 528 pr->flags.bm_control = 1; 529 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 530 "Bus mastering arbitration control present\n")); 531 } else 532 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 533 "No bus mastering arbitration control\n")); 534 535 /* Check if it is a Device with HID and UID */ 536 if (has_uid) { 537 unsigned long value; 538 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 539 NULL, &value); 540 if (ACPI_FAILURE(status)) { 541 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 542 return -ENODEV; 543 } 544 pr->acpi_id = value; 545 } else { 546 /* 547 * Evalute the processor object. Note that it is common on SMP to 548 * have the first (boot) processor with a valid PBLK address while 549 * all others have a NULL address. 550 */ 551 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 552 if (ACPI_FAILURE(status)) { 553 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 554 return -ENODEV; 555 } 556 557 /* 558 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 559 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 560 */ 561 pr->acpi_id = object.processor.proc_id; 562 } 563 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 564 565 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 566 if (!cpu0_initialized && (cpu_index == -1) && 567 (num_online_cpus() == 1)) { 568 cpu_index = 0; 569 } 570 571 cpu0_initialized = 1; 572 573 pr->id = cpu_index; 574 575 /* 576 * Extra Processor objects may be enumerated on MP systems with 577 * less than the max # of CPUs. They should be ignored _iff 578 * they are physically not present. 579 */ 580 if (pr->id == -1) { 581 if (ACPI_FAILURE 582 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 583 return -ENODEV; 584 } 585 } 586 587 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 588 pr->acpi_id)); 589 590 if (!object.processor.pblk_address) 591 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 592 else if (object.processor.pblk_length != 6) 593 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 594 object.processor.pblk_length); 595 else { 596 pr->throttling.address = object.processor.pblk_address; 597 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 598 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 599 600 pr->pblk = object.processor.pblk_address; 601 602 /* 603 * We don't care about error returns - we just try to mark 604 * these reserved so that nobody else is confused into thinking 605 * that this region might be unused.. 606 * 607 * (In particular, allocating the IO range for Cardbus) 608 */ 609 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 610 } 611 612 #ifdef CONFIG_CPU_FREQ 613 acpi_processor_ppc_has_changed(pr); 614 #endif 615 acpi_processor_get_throttling_info(pr); 616 acpi_processor_get_limit_info(pr); 617 618 return 0; 619 } 620 621 static void *processor_device_array[NR_CPUS]; 622 623 static int __cpuinit acpi_processor_start(struct acpi_device *device) 624 { 625 int result = 0; 626 acpi_status status = AE_OK; 627 struct acpi_processor *pr; 628 629 630 pr = acpi_driver_data(device); 631 632 result = acpi_processor_get_info(pr, device->flags.unique_id); 633 if (result) { 634 /* Processor is physically not present */ 635 return 0; 636 } 637 638 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 639 640 /* 641 * Buggy BIOS check 642 * ACPI id of processors can be reported wrongly by the BIOS. 643 * Don't trust it blindly 644 */ 645 if (processor_device_array[pr->id] != NULL && 646 processor_device_array[pr->id] != device) { 647 printk(KERN_WARNING "BIOS reported wrong ACPI id" 648 "for the processor\n"); 649 return -ENODEV; 650 } 651 processor_device_array[pr->id] = device; 652 653 processors[pr->id] = pr; 654 655 result = acpi_processor_add_fs(device); 656 if (result) 657 goto end; 658 659 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 660 acpi_processor_notify, pr); 661 662 /* _PDC call should be done before doing anything else (if reqd.). */ 663 arch_acpi_processor_init_pdc(pr); 664 acpi_processor_set_pdc(pr); 665 666 acpi_processor_power_init(pr, device); 667 668 if (pr->flags.throttling) { 669 printk(KERN_INFO PREFIX "%s [%s] (supports", 670 acpi_device_name(device), acpi_device_bid(device)); 671 printk(" %d throttling states", pr->throttling.state_count); 672 printk(")\n"); 673 } 674 675 end: 676 677 return result; 678 } 679 680 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 681 { 682 struct acpi_processor *pr = data; 683 struct acpi_device *device = NULL; 684 685 686 if (!pr) 687 return; 688 689 if (acpi_bus_get_device(pr->handle, &device)) 690 return; 691 692 switch (event) { 693 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 694 acpi_processor_ppc_has_changed(pr); 695 acpi_bus_generate_event(device, event, 696 pr->performance_platform_limit); 697 break; 698 case ACPI_PROCESSOR_NOTIFY_POWER: 699 acpi_processor_cst_has_changed(pr); 700 acpi_bus_generate_event(device, event, 0); 701 break; 702 default: 703 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 704 "Unsupported event [0x%x]\n", event)); 705 break; 706 } 707 708 return; 709 } 710 711 static int acpi_processor_add(struct acpi_device *device) 712 { 713 struct acpi_processor *pr = NULL; 714 715 716 if (!device) 717 return -EINVAL; 718 719 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 720 if (!pr) 721 return -ENOMEM; 722 723 pr->handle = device->handle; 724 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 725 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 726 acpi_driver_data(device) = pr; 727 728 return 0; 729 } 730 731 static int acpi_processor_remove(struct acpi_device *device, int type) 732 { 733 acpi_status status = AE_OK; 734 struct acpi_processor *pr = NULL; 735 736 737 if (!device || !acpi_driver_data(device)) 738 return -EINVAL; 739 740 pr = acpi_driver_data(device); 741 742 if (pr->id >= NR_CPUS) { 743 kfree(pr); 744 return 0; 745 } 746 747 if (type == ACPI_BUS_REMOVAL_EJECT) { 748 if (acpi_processor_handle_eject(pr)) 749 return -EINVAL; 750 } 751 752 acpi_processor_power_exit(pr, device); 753 754 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 755 acpi_processor_notify); 756 757 acpi_processor_remove_fs(device); 758 759 processors[pr->id] = NULL; 760 761 kfree(pr); 762 763 return 0; 764 } 765 766 #ifdef CONFIG_ACPI_HOTPLUG_CPU 767 /**************************************************************************** 768 * Acpi processor hotplug support * 769 ****************************************************************************/ 770 771 static int is_processor_present(acpi_handle handle); 772 773 static int is_processor_present(acpi_handle handle) 774 { 775 acpi_status status; 776 unsigned long sta = 0; 777 778 779 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 780 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) { 781 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 782 return 0; 783 } 784 return 1; 785 } 786 787 static 788 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 789 { 790 acpi_handle phandle; 791 struct acpi_device *pdev; 792 struct acpi_processor *pr; 793 794 795 if (acpi_get_parent(handle, &phandle)) { 796 return -ENODEV; 797 } 798 799 if (acpi_bus_get_device(phandle, &pdev)) { 800 return -ENODEV; 801 } 802 803 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 804 return -ENODEV; 805 } 806 807 acpi_bus_start(*device); 808 809 pr = acpi_driver_data(*device); 810 if (!pr) 811 return -ENODEV; 812 813 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 814 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 815 } 816 return 0; 817 } 818 819 static void 820 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 821 { 822 struct acpi_processor *pr; 823 struct acpi_device *device = NULL; 824 int result; 825 826 827 switch (event) { 828 case ACPI_NOTIFY_BUS_CHECK: 829 case ACPI_NOTIFY_DEVICE_CHECK: 830 printk("Processor driver received %s event\n", 831 (event == ACPI_NOTIFY_BUS_CHECK) ? 832 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 833 834 if (!is_processor_present(handle)) 835 break; 836 837 if (acpi_bus_get_device(handle, &device)) { 838 result = acpi_processor_device_add(handle, &device); 839 if (result) 840 printk(KERN_ERR PREFIX 841 "Unable to add the device\n"); 842 break; 843 } 844 845 pr = acpi_driver_data(device); 846 if (!pr) { 847 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 848 break; 849 } 850 851 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 852 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 853 break; 854 } 855 856 result = acpi_processor_start(device); 857 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 858 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 859 } else { 860 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 861 acpi_device_bid(device)); 862 } 863 break; 864 case ACPI_NOTIFY_EJECT_REQUEST: 865 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 866 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 867 868 if (acpi_bus_get_device(handle, &device)) { 869 printk(KERN_ERR PREFIX 870 "Device don't exist, dropping EJECT\n"); 871 break; 872 } 873 pr = acpi_driver_data(device); 874 if (!pr) { 875 printk(KERN_ERR PREFIX 876 "Driver data is NULL, dropping EJECT\n"); 877 return; 878 } 879 880 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 881 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 882 break; 883 default: 884 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 885 "Unsupported event [0x%x]\n", event)); 886 break; 887 } 888 889 return; 890 } 891 892 static acpi_status 893 processor_walk_namespace_cb(acpi_handle handle, 894 u32 lvl, void *context, void **rv) 895 { 896 acpi_status status; 897 int *action = context; 898 acpi_object_type type = 0; 899 900 status = acpi_get_type(handle, &type); 901 if (ACPI_FAILURE(status)) 902 return (AE_OK); 903 904 if (type != ACPI_TYPE_PROCESSOR) 905 return (AE_OK); 906 907 switch (*action) { 908 case INSTALL_NOTIFY_HANDLER: 909 acpi_install_notify_handler(handle, 910 ACPI_SYSTEM_NOTIFY, 911 acpi_processor_hotplug_notify, 912 NULL); 913 break; 914 case UNINSTALL_NOTIFY_HANDLER: 915 acpi_remove_notify_handler(handle, 916 ACPI_SYSTEM_NOTIFY, 917 acpi_processor_hotplug_notify); 918 break; 919 default: 920 break; 921 } 922 923 return (AE_OK); 924 } 925 926 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 927 { 928 929 if (!is_processor_present(handle)) { 930 return AE_ERROR; 931 } 932 933 if (acpi_map_lsapic(handle, p_cpu)) 934 return AE_ERROR; 935 936 if (arch_register_cpu(*p_cpu)) { 937 acpi_unmap_lsapic(*p_cpu); 938 return AE_ERROR; 939 } 940 941 return AE_OK; 942 } 943 944 static int acpi_processor_handle_eject(struct acpi_processor *pr) 945 { 946 if (cpu_online(pr->id)) { 947 return (-EINVAL); 948 } 949 arch_unregister_cpu(pr->id); 950 acpi_unmap_lsapic(pr->id); 951 return (0); 952 } 953 #else 954 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 955 { 956 return AE_ERROR; 957 } 958 static int acpi_processor_handle_eject(struct acpi_processor *pr) 959 { 960 return (-EINVAL); 961 } 962 #endif 963 964 static 965 void acpi_processor_install_hotplug_notify(void) 966 { 967 #ifdef CONFIG_ACPI_HOTPLUG_CPU 968 int action = INSTALL_NOTIFY_HANDLER; 969 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 970 ACPI_ROOT_OBJECT, 971 ACPI_UINT32_MAX, 972 processor_walk_namespace_cb, &action, NULL); 973 #endif 974 } 975 976 static 977 void acpi_processor_uninstall_hotplug_notify(void) 978 { 979 #ifdef CONFIG_ACPI_HOTPLUG_CPU 980 int action = UNINSTALL_NOTIFY_HANDLER; 981 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 982 ACPI_ROOT_OBJECT, 983 ACPI_UINT32_MAX, 984 processor_walk_namespace_cb, &action, NULL); 985 #endif 986 } 987 988 /* 989 * We keep the driver loaded even when ACPI is not running. 990 * This is needed for the powernow-k8 driver, that works even without 991 * ACPI, but needs symbols from this driver 992 */ 993 994 static int __init acpi_processor_init(void) 995 { 996 int result = 0; 997 998 999 memset(&processors, 0, sizeof(processors)); 1000 memset(&errata, 0, sizeof(errata)); 1001 1002 #ifdef CONFIG_SMP 1003 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1004 (struct acpi_table_header **)&madt))) 1005 madt = NULL; 1006 #endif 1007 1008 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1009 if (!acpi_processor_dir) 1010 return -ENOMEM; 1011 acpi_processor_dir->owner = THIS_MODULE; 1012 1013 result = acpi_bus_register_driver(&acpi_processor_driver); 1014 if (result < 0) { 1015 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1016 return result; 1017 } 1018 1019 acpi_processor_install_hotplug_notify(); 1020 1021 acpi_thermal_cpufreq_init(); 1022 1023 acpi_processor_ppc_init(); 1024 1025 return 0; 1026 } 1027 1028 static void __exit acpi_processor_exit(void) 1029 { 1030 1031 acpi_processor_ppc_exit(); 1032 1033 acpi_thermal_cpufreq_exit(); 1034 1035 acpi_processor_uninstall_hotplug_notify(); 1036 1037 acpi_bus_unregister_driver(&acpi_processor_driver); 1038 1039 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1040 1041 return; 1042 } 1043 1044 module_init(acpi_processor_init); 1045 module_exit(acpi_processor_exit); 1046 1047 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1048 1049 MODULE_ALIAS("processor"); 1050