1 /* 2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> 7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 8 * - Added processor hotplug support 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or (at 15 * your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License along 23 * with this program; if not, write to the Free Software Foundation, Inc., 24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 * TBD: 28 * 1. Make # power states dynamic. 29 * 2. Support duty_cycle values that span bit 4. 30 * 3. Optimize by having scheduler determine business instead of 31 * having us try to calculate it here. 32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this. 33 */ 34 35 #include <linux/kernel.h> 36 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/types.h> 39 #include <linux/pci.h> 40 #include <linux/pm.h> 41 #include <linux/cpufreq.h> 42 #include <linux/cpu.h> 43 #include <linux/proc_fs.h> 44 #include <linux/seq_file.h> 45 #include <linux/dmi.h> 46 #include <linux/moduleparam.h> 47 48 #include <asm/io.h> 49 #include <asm/system.h> 50 #include <asm/cpu.h> 51 #include <asm/delay.h> 52 #include <asm/uaccess.h> 53 #include <asm/processor.h> 54 #include <asm/smp.h> 55 #include <asm/acpi.h> 56 57 #include <acpi/acpi_bus.h> 58 #include <acpi/acpi_drivers.h> 59 #include <acpi/processor.h> 60 61 #define ACPI_PROCESSOR_COMPONENT 0x01000000 62 #define ACPI_PROCESSOR_CLASS "processor" 63 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" 64 #define ACPI_PROCESSOR_DEVICE_NAME "Processor" 65 #define ACPI_PROCESSOR_FILE_INFO "info" 66 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 67 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 68 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 69 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 70 71 #define ACPI_PROCESSOR_LIMIT_USER 0 72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 73 74 #define ACPI_STA_PRESENT 0x00000001 75 76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 77 ACPI_MODULE_NAME("acpi_processor") 78 79 MODULE_AUTHOR("Paul Diefenbaugh"); 80 MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME); 81 MODULE_LICENSE("GPL"); 82 83 static int acpi_processor_add(struct acpi_device *device); 84 static int acpi_processor_start(struct acpi_device *device); 85 static int acpi_processor_remove(struct acpi_device *device, int type); 86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 87 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 88 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 89 static int acpi_processor_handle_eject(struct acpi_processor *pr); 90 91 static struct acpi_driver acpi_processor_driver = { 92 .name = ACPI_PROCESSOR_DRIVER_NAME, 93 .class = ACPI_PROCESSOR_CLASS, 94 .ids = ACPI_PROCESSOR_HID, 95 .ops = { 96 .add = acpi_processor_add, 97 .remove = acpi_processor_remove, 98 .start = acpi_processor_start, 99 }, 100 }; 101 102 #define INSTALL_NOTIFY_HANDLER 1 103 #define UNINSTALL_NOTIFY_HANDLER 2 104 105 static const struct file_operations acpi_processor_info_fops = { 106 .open = acpi_processor_info_open_fs, 107 .read = seq_read, 108 .llseek = seq_lseek, 109 .release = single_release, 110 }; 111 112 struct acpi_processor *processors[NR_CPUS]; 113 struct acpi_processor_errata errata __read_mostly; 114 115 /* -------------------------------------------------------------------------- 116 Errata Handling 117 -------------------------------------------------------------------------- */ 118 119 static int acpi_processor_errata_piix4(struct pci_dev *dev) 120 { 121 u8 rev = 0; 122 u8 value1 = 0; 123 u8 value2 = 0; 124 125 126 if (!dev) 127 return -EINVAL; 128 129 /* 130 * Note that 'dev' references the PIIX4 ACPI Controller. 131 */ 132 133 pci_read_config_byte(dev, PCI_REVISION_ID, &rev); 134 135 switch (rev) { 136 case 0: 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 138 break; 139 case 1: 140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 141 break; 142 case 2: 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 144 break; 145 case 3: 146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 147 break; 148 default: 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 150 break; 151 } 152 153 switch (rev) { 154 155 case 0: /* PIIX4 A-step */ 156 case 1: /* PIIX4 B-step */ 157 /* 158 * See specification changes #13 ("Manual Throttle Duty Cycle") 159 * and #14 ("Enabling and Disabling Manual Throttle"), plus 160 * erratum #5 ("STPCLK# Deassertion Time") from the January 161 * 2002 PIIX4 specification update. Applies to only older 162 * PIIX4 models. 163 */ 164 errata.piix4.throttle = 1; 165 166 case 2: /* PIIX4E */ 167 case 3: /* PIIX4M */ 168 /* 169 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 170 * Livelock") from the January 2002 PIIX4 specification update. 171 * Applies to all PIIX4 models. 172 */ 173 174 /* 175 * BM-IDE 176 * ------ 177 * Find the PIIX4 IDE Controller and get the Bus Master IDE 178 * Status register address. We'll use this later to read 179 * each IDE controller's DMA status to make sure we catch all 180 * DMA activity. 181 */ 182 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 183 PCI_DEVICE_ID_INTEL_82371AB, 184 PCI_ANY_ID, PCI_ANY_ID, NULL); 185 if (dev) { 186 errata.piix4.bmisx = pci_resource_start(dev, 4); 187 pci_dev_put(dev); 188 } 189 190 /* 191 * Type-F DMA 192 * ---------- 193 * Find the PIIX4 ISA Controller and read the Motherboard 194 * DMA controller's status to see if Type-F (Fast) DMA mode 195 * is enabled (bit 7) on either channel. Note that we'll 196 * disable C3 support if this is enabled, as some legacy 197 * devices won't operate well if fast DMA is disabled. 198 */ 199 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 200 PCI_DEVICE_ID_INTEL_82371AB_0, 201 PCI_ANY_ID, PCI_ANY_ID, NULL); 202 if (dev) { 203 pci_read_config_byte(dev, 0x76, &value1); 204 pci_read_config_byte(dev, 0x77, &value2); 205 if ((value1 & 0x80) || (value2 & 0x80)) 206 errata.piix4.fdma = 1; 207 pci_dev_put(dev); 208 } 209 210 break; 211 } 212 213 if (errata.piix4.bmisx) 214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 215 "Bus master activity detection (BM-IDE) erratum enabled\n")); 216 if (errata.piix4.fdma) 217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 218 "Type-F DMA livelock erratum (C3 disabled)\n")); 219 220 return 0; 221 } 222 223 static int acpi_processor_errata(struct acpi_processor *pr) 224 { 225 int result = 0; 226 struct pci_dev *dev = NULL; 227 228 229 if (!pr) 230 return -EINVAL; 231 232 /* 233 * PIIX4 234 */ 235 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 236 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 237 PCI_ANY_ID, NULL); 238 if (dev) { 239 result = acpi_processor_errata_piix4(dev); 240 pci_dev_put(dev); 241 } 242 243 return result; 244 } 245 246 /* -------------------------------------------------------------------------- 247 Common ACPI processor functions 248 -------------------------------------------------------------------------- */ 249 250 /* 251 * _PDC is required for a BIOS-OS handshake for most of the newer 252 * ACPI processor features. 253 */ 254 static int acpi_processor_set_pdc(struct acpi_processor *pr) 255 { 256 struct acpi_object_list *pdc_in = pr->pdc; 257 acpi_status status = AE_OK; 258 259 260 if (!pdc_in) 261 return status; 262 263 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 264 265 if (ACPI_FAILURE(status)) 266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 267 "Could not evaluate _PDC, using legacy perf. control...\n")); 268 269 return status; 270 } 271 272 /* -------------------------------------------------------------------------- 273 FS Interface (/proc) 274 -------------------------------------------------------------------------- */ 275 276 static struct proc_dir_entry *acpi_processor_dir = NULL; 277 278 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 279 { 280 struct acpi_processor *pr = seq->private; 281 282 283 if (!pr) 284 goto end; 285 286 seq_printf(seq, "processor id: %d\n" 287 "acpi id: %d\n" 288 "bus mastering control: %s\n" 289 "power management: %s\n" 290 "throttling control: %s\n" 291 "limit interface: %s\n", 292 pr->id, 293 pr->acpi_id, 294 pr->flags.bm_control ? "yes" : "no", 295 pr->flags.power ? "yes" : "no", 296 pr->flags.throttling ? "yes" : "no", 297 pr->flags.limit ? "yes" : "no"); 298 299 end: 300 return 0; 301 } 302 303 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 304 { 305 return single_open(file, acpi_processor_info_seq_show, 306 PDE(inode)->data); 307 } 308 309 static int acpi_processor_add_fs(struct acpi_device *device) 310 { 311 struct proc_dir_entry *entry = NULL; 312 313 314 if (!acpi_device_dir(device)) { 315 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 316 acpi_processor_dir); 317 if (!acpi_device_dir(device)) 318 return -ENODEV; 319 } 320 acpi_device_dir(device)->owner = THIS_MODULE; 321 322 /* 'info' [R] */ 323 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 324 S_IRUGO, acpi_device_dir(device)); 325 if (!entry) 326 return -EIO; 327 else { 328 entry->proc_fops = &acpi_processor_info_fops; 329 entry->data = acpi_driver_data(device); 330 entry->owner = THIS_MODULE; 331 } 332 333 /* 'throttling' [R/W] */ 334 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 335 S_IFREG | S_IRUGO | S_IWUSR, 336 acpi_device_dir(device)); 337 if (!entry) 338 return -EIO; 339 else { 340 entry->proc_fops = &acpi_processor_throttling_fops; 341 entry->data = acpi_driver_data(device); 342 entry->owner = THIS_MODULE; 343 } 344 345 /* 'limit' [R/W] */ 346 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 347 S_IFREG | S_IRUGO | S_IWUSR, 348 acpi_device_dir(device)); 349 if (!entry) 350 return -EIO; 351 else { 352 entry->proc_fops = &acpi_processor_limit_fops; 353 entry->data = acpi_driver_data(device); 354 entry->owner = THIS_MODULE; 355 } 356 357 return 0; 358 } 359 360 static int acpi_processor_remove_fs(struct acpi_device *device) 361 { 362 363 if (acpi_device_dir(device)) { 364 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 365 acpi_device_dir(device)); 366 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 367 acpi_device_dir(device)); 368 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 369 acpi_device_dir(device)); 370 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 371 acpi_device_dir(device) = NULL; 372 } 373 374 return 0; 375 } 376 377 /* Use the acpiid in MADT to map cpus in case of SMP */ 378 379 #ifndef CONFIG_SMP 380 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;} 381 #else 382 383 static struct acpi_table_madt *madt; 384 385 static int map_lapic_id(struct acpi_subtable_header *entry, 386 u32 acpi_id, int *apic_id) 387 { 388 struct acpi_madt_local_apic *lapic = 389 (struct acpi_madt_local_apic *)entry; 390 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 391 lapic->processor_id == acpi_id) { 392 *apic_id = lapic->id; 393 return 1; 394 } 395 return 0; 396 } 397 398 static int map_lsapic_id(struct acpi_subtable_header *entry, 399 u32 acpi_id, int *apic_id) 400 { 401 struct acpi_madt_local_sapic *lsapic = 402 (struct acpi_madt_local_sapic *)entry; 403 /* Only check enabled APICs*/ 404 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 405 /* First check against id */ 406 if (lsapic->processor_id == acpi_id) { 407 *apic_id = lsapic->id; 408 return 1; 409 /* Check against optional uid */ 410 } else if (entry->length >= 16 && 411 lsapic->uid == acpi_id) { 412 *apic_id = lsapic->uid; 413 return 1; 414 } 415 } 416 return 0; 417 } 418 419 #ifdef CONFIG_IA64 420 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 421 #else 422 #define arch_cpu_to_apicid x86_cpu_to_apicid 423 #endif 424 425 static int map_madt_entry(u32 acpi_id) 426 { 427 unsigned long madt_end, entry; 428 int apic_id = -1; 429 430 if (!madt) 431 return apic_id; 432 433 entry = (unsigned long)madt; 434 madt_end = entry + madt->header.length; 435 436 /* Parse all entries looking for a match. */ 437 438 entry += sizeof(struct acpi_table_madt); 439 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 440 struct acpi_subtable_header *header = 441 (struct acpi_subtable_header *)entry; 442 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 443 if (map_lapic_id(header, acpi_id, &apic_id)) 444 break; 445 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 446 if (map_lsapic_id(header, acpi_id, &apic_id)) 447 break; 448 } 449 entry += header->length; 450 } 451 return apic_id; 452 } 453 454 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 455 { 456 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 457 union acpi_object *obj; 458 struct acpi_subtable_header *header; 459 int apic_id = -1; 460 461 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 462 goto exit; 463 464 if (!buffer.length || !buffer.pointer) 465 goto exit; 466 467 obj = buffer.pointer; 468 if (obj->type != ACPI_TYPE_BUFFER || 469 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 470 goto exit; 471 } 472 473 header = (struct acpi_subtable_header *)obj->buffer.pointer; 474 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 475 map_lapic_id(header, acpi_id, &apic_id); 476 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 477 map_lsapic_id(header, acpi_id, &apic_id); 478 } 479 480 exit: 481 if (buffer.pointer) 482 kfree(buffer.pointer); 483 return apic_id; 484 } 485 486 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 487 { 488 int i; 489 int apic_id = -1; 490 491 apic_id = map_mat_entry(handle, acpi_id); 492 if (apic_id == -1) 493 apic_id = map_madt_entry(acpi_id); 494 if (apic_id == -1) 495 return apic_id; 496 497 for (i = 0; i < NR_CPUS; ++i) { 498 if (arch_cpu_to_apicid[i] == apic_id) 499 return i; 500 } 501 return -1; 502 } 503 #endif 504 505 /* -------------------------------------------------------------------------- 506 Driver Interface 507 -------------------------------------------------------------------------- */ 508 509 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 510 { 511 acpi_status status = 0; 512 union acpi_object object = { 0 }; 513 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 514 int cpu_index; 515 static int cpu0_initialized; 516 517 518 if (!pr) 519 return -EINVAL; 520 521 if (num_online_cpus() > 1) 522 errata.smp = TRUE; 523 524 acpi_processor_errata(pr); 525 526 /* 527 * Check to see if we have bus mastering arbitration control. This 528 * is required for proper C3 usage (to maintain cache coherency). 529 */ 530 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 531 pr->flags.bm_control = 1; 532 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 533 "Bus mastering arbitration control present\n")); 534 } else 535 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 536 "No bus mastering arbitration control\n")); 537 538 /* Check if it is a Device with HID and UID */ 539 if (has_uid) { 540 unsigned long value; 541 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 542 NULL, &value); 543 if (ACPI_FAILURE(status)) { 544 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 545 return -ENODEV; 546 } 547 pr->acpi_id = value; 548 } else { 549 /* 550 * Evalute the processor object. Note that it is common on SMP to 551 * have the first (boot) processor with a valid PBLK address while 552 * all others have a NULL address. 553 */ 554 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 555 if (ACPI_FAILURE(status)) { 556 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 557 return -ENODEV; 558 } 559 560 /* 561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 563 */ 564 pr->acpi_id = object.processor.proc_id; 565 } 566 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 567 568 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 569 if (!cpu0_initialized && (cpu_index == -1) && 570 (num_online_cpus() == 1)) { 571 cpu_index = 0; 572 } 573 574 cpu0_initialized = 1; 575 576 pr->id = cpu_index; 577 578 /* 579 * Extra Processor objects may be enumerated on MP systems with 580 * less than the max # of CPUs. They should be ignored _iff 581 * they are physically not present. 582 */ 583 if (pr->id == -1) { 584 if (ACPI_FAILURE 585 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 586 return -ENODEV; 587 } 588 } 589 590 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 591 pr->acpi_id)); 592 593 if (!object.processor.pblk_address) 594 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 595 else if (object.processor.pblk_length != 6) 596 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 597 object.processor.pblk_length); 598 else { 599 pr->throttling.address = object.processor.pblk_address; 600 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 601 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 602 603 pr->pblk = object.processor.pblk_address; 604 605 /* 606 * We don't care about error returns - we just try to mark 607 * these reserved so that nobody else is confused into thinking 608 * that this region might be unused.. 609 * 610 * (In particular, allocating the IO range for Cardbus) 611 */ 612 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 613 } 614 615 #ifdef CONFIG_CPU_FREQ 616 acpi_processor_ppc_has_changed(pr); 617 #endif 618 acpi_processor_get_throttling_info(pr); 619 acpi_processor_get_limit_info(pr); 620 621 return 0; 622 } 623 624 static void *processor_device_array[NR_CPUS]; 625 626 static int __cpuinit acpi_processor_start(struct acpi_device *device) 627 { 628 int result = 0; 629 acpi_status status = AE_OK; 630 struct acpi_processor *pr; 631 632 633 pr = acpi_driver_data(device); 634 635 result = acpi_processor_get_info(pr, device->flags.unique_id); 636 if (result) { 637 /* Processor is physically not present */ 638 return 0; 639 } 640 641 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 642 643 /* 644 * Buggy BIOS check 645 * ACPI id of processors can be reported wrongly by the BIOS. 646 * Don't trust it blindly 647 */ 648 if (processor_device_array[pr->id] != NULL && 649 processor_device_array[pr->id] != device) { 650 printk(KERN_WARNING "BIOS reported wrong ACPI id" 651 "for the processor\n"); 652 return -ENODEV; 653 } 654 processor_device_array[pr->id] = device; 655 656 processors[pr->id] = pr; 657 658 result = acpi_processor_add_fs(device); 659 if (result) 660 goto end; 661 662 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 663 acpi_processor_notify, pr); 664 665 /* _PDC call should be done before doing anything else (if reqd.). */ 666 arch_acpi_processor_init_pdc(pr); 667 acpi_processor_set_pdc(pr); 668 669 acpi_processor_power_init(pr, device); 670 671 if (pr->flags.throttling) { 672 printk(KERN_INFO PREFIX "%s [%s] (supports", 673 acpi_device_name(device), acpi_device_bid(device)); 674 printk(" %d throttling states", pr->throttling.state_count); 675 printk(")\n"); 676 } 677 678 end: 679 680 return result; 681 } 682 683 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 684 { 685 struct acpi_processor *pr = data; 686 struct acpi_device *device = NULL; 687 688 689 if (!pr) 690 return; 691 692 if (acpi_bus_get_device(pr->handle, &device)) 693 return; 694 695 switch (event) { 696 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 697 acpi_processor_ppc_has_changed(pr); 698 acpi_bus_generate_event(device, event, 699 pr->performance_platform_limit); 700 break; 701 case ACPI_PROCESSOR_NOTIFY_POWER: 702 acpi_processor_cst_has_changed(pr); 703 acpi_bus_generate_event(device, event, 0); 704 break; 705 default: 706 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 707 "Unsupported event [0x%x]\n", event)); 708 break; 709 } 710 711 return; 712 } 713 714 static int acpi_processor_add(struct acpi_device *device) 715 { 716 struct acpi_processor *pr = NULL; 717 718 719 if (!device) 720 return -EINVAL; 721 722 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 723 if (!pr) 724 return -ENOMEM; 725 726 pr->handle = device->handle; 727 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 728 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 729 acpi_driver_data(device) = pr; 730 731 return 0; 732 } 733 734 static int acpi_processor_remove(struct acpi_device *device, int type) 735 { 736 acpi_status status = AE_OK; 737 struct acpi_processor *pr = NULL; 738 739 740 if (!device || !acpi_driver_data(device)) 741 return -EINVAL; 742 743 pr = acpi_driver_data(device); 744 745 if (pr->id >= NR_CPUS) { 746 kfree(pr); 747 return 0; 748 } 749 750 if (type == ACPI_BUS_REMOVAL_EJECT) { 751 if (acpi_processor_handle_eject(pr)) 752 return -EINVAL; 753 } 754 755 acpi_processor_power_exit(pr, device); 756 757 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 758 acpi_processor_notify); 759 760 acpi_processor_remove_fs(device); 761 762 processors[pr->id] = NULL; 763 764 kfree(pr); 765 766 return 0; 767 } 768 769 #ifdef CONFIG_ACPI_HOTPLUG_CPU 770 /**************************************************************************** 771 * Acpi processor hotplug support * 772 ****************************************************************************/ 773 774 static int is_processor_present(acpi_handle handle); 775 776 static int is_processor_present(acpi_handle handle) 777 { 778 acpi_status status; 779 unsigned long sta = 0; 780 781 782 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 783 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { 784 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 785 return 0; 786 } 787 return 1; 788 } 789 790 static 791 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 792 { 793 acpi_handle phandle; 794 struct acpi_device *pdev; 795 struct acpi_processor *pr; 796 797 798 if (acpi_get_parent(handle, &phandle)) { 799 return -ENODEV; 800 } 801 802 if (acpi_bus_get_device(phandle, &pdev)) { 803 return -ENODEV; 804 } 805 806 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 807 return -ENODEV; 808 } 809 810 acpi_bus_start(*device); 811 812 pr = acpi_driver_data(*device); 813 if (!pr) 814 return -ENODEV; 815 816 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 817 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 818 } 819 return 0; 820 } 821 822 static void 823 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 824 { 825 struct acpi_processor *pr; 826 struct acpi_device *device = NULL; 827 int result; 828 829 830 switch (event) { 831 case ACPI_NOTIFY_BUS_CHECK: 832 case ACPI_NOTIFY_DEVICE_CHECK: 833 printk("Processor driver received %s event\n", 834 (event == ACPI_NOTIFY_BUS_CHECK) ? 835 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 836 837 if (!is_processor_present(handle)) 838 break; 839 840 if (acpi_bus_get_device(handle, &device)) { 841 result = acpi_processor_device_add(handle, &device); 842 if (result) 843 printk(KERN_ERR PREFIX 844 "Unable to add the device\n"); 845 break; 846 } 847 848 pr = acpi_driver_data(device); 849 if (!pr) { 850 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 851 break; 852 } 853 854 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 855 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 856 break; 857 } 858 859 result = acpi_processor_start(device); 860 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 861 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 862 } else { 863 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 864 acpi_device_bid(device)); 865 } 866 break; 867 case ACPI_NOTIFY_EJECT_REQUEST: 868 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 869 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 870 871 if (acpi_bus_get_device(handle, &device)) { 872 printk(KERN_ERR PREFIX 873 "Device don't exist, dropping EJECT\n"); 874 break; 875 } 876 pr = acpi_driver_data(device); 877 if (!pr) { 878 printk(KERN_ERR PREFIX 879 "Driver data is NULL, dropping EJECT\n"); 880 return; 881 } 882 883 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 884 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 885 break; 886 default: 887 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 888 "Unsupported event [0x%x]\n", event)); 889 break; 890 } 891 892 return; 893 } 894 895 static acpi_status 896 processor_walk_namespace_cb(acpi_handle handle, 897 u32 lvl, void *context, void **rv) 898 { 899 acpi_status status; 900 int *action = context; 901 acpi_object_type type = 0; 902 903 status = acpi_get_type(handle, &type); 904 if (ACPI_FAILURE(status)) 905 return (AE_OK); 906 907 if (type != ACPI_TYPE_PROCESSOR) 908 return (AE_OK); 909 910 switch (*action) { 911 case INSTALL_NOTIFY_HANDLER: 912 acpi_install_notify_handler(handle, 913 ACPI_SYSTEM_NOTIFY, 914 acpi_processor_hotplug_notify, 915 NULL); 916 break; 917 case UNINSTALL_NOTIFY_HANDLER: 918 acpi_remove_notify_handler(handle, 919 ACPI_SYSTEM_NOTIFY, 920 acpi_processor_hotplug_notify); 921 break; 922 default: 923 break; 924 } 925 926 return (AE_OK); 927 } 928 929 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 930 { 931 932 if (!is_processor_present(handle)) { 933 return AE_ERROR; 934 } 935 936 if (acpi_map_lsapic(handle, p_cpu)) 937 return AE_ERROR; 938 939 if (arch_register_cpu(*p_cpu)) { 940 acpi_unmap_lsapic(*p_cpu); 941 return AE_ERROR; 942 } 943 944 return AE_OK; 945 } 946 947 static int acpi_processor_handle_eject(struct acpi_processor *pr) 948 { 949 if (cpu_online(pr->id)) { 950 return (-EINVAL); 951 } 952 arch_unregister_cpu(pr->id); 953 acpi_unmap_lsapic(pr->id); 954 return (0); 955 } 956 #else 957 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 958 { 959 return AE_ERROR; 960 } 961 static int acpi_processor_handle_eject(struct acpi_processor *pr) 962 { 963 return (-EINVAL); 964 } 965 #endif 966 967 static 968 void acpi_processor_install_hotplug_notify(void) 969 { 970 #ifdef CONFIG_ACPI_HOTPLUG_CPU 971 int action = INSTALL_NOTIFY_HANDLER; 972 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 973 ACPI_ROOT_OBJECT, 974 ACPI_UINT32_MAX, 975 processor_walk_namespace_cb, &action, NULL); 976 #endif 977 } 978 979 static 980 void acpi_processor_uninstall_hotplug_notify(void) 981 { 982 #ifdef CONFIG_ACPI_HOTPLUG_CPU 983 int action = UNINSTALL_NOTIFY_HANDLER; 984 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 985 ACPI_ROOT_OBJECT, 986 ACPI_UINT32_MAX, 987 processor_walk_namespace_cb, &action, NULL); 988 #endif 989 } 990 991 /* 992 * We keep the driver loaded even when ACPI is not running. 993 * This is needed for the powernow-k8 driver, that works even without 994 * ACPI, but needs symbols from this driver 995 */ 996 997 static int __init acpi_processor_init(void) 998 { 999 int result = 0; 1000 1001 1002 memset(&processors, 0, sizeof(processors)); 1003 memset(&errata, 0, sizeof(errata)); 1004 1005 #ifdef CONFIG_SMP 1006 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1007 (struct acpi_table_header **)&madt))) 1008 madt = 0; 1009 #endif 1010 1011 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1012 if (!acpi_processor_dir) 1013 return -ENOMEM; 1014 acpi_processor_dir->owner = THIS_MODULE; 1015 1016 result = acpi_bus_register_driver(&acpi_processor_driver); 1017 if (result < 0) { 1018 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1019 return result; 1020 } 1021 1022 acpi_processor_install_hotplug_notify(); 1023 1024 acpi_thermal_cpufreq_init(); 1025 1026 acpi_processor_ppc_init(); 1027 1028 return 0; 1029 } 1030 1031 static void __exit acpi_processor_exit(void) 1032 { 1033 1034 acpi_processor_ppc_exit(); 1035 1036 acpi_thermal_cpufreq_exit(); 1037 1038 acpi_processor_uninstall_hotplug_notify(); 1039 1040 acpi_bus_unregister_driver(&acpi_processor_driver); 1041 1042 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1043 1044 return; 1045 } 1046 1047 module_init(acpi_processor_init); 1048 module_exit(acpi_processor_exit); 1049 1050 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1051 1052 MODULE_ALIAS("processor"); 1053