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 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 70 71 #define ACPI_PROCESSOR_LIMIT_USER 0 72 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 73 74 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 75 ACPI_MODULE_NAME("processor_core"); 76 77 MODULE_AUTHOR("Paul Diefenbaugh"); 78 MODULE_DESCRIPTION("ACPI Processor Driver"); 79 MODULE_LICENSE("GPL"); 80 81 static int acpi_processor_add(struct acpi_device *device); 82 static int acpi_processor_start(struct acpi_device *device); 83 static int acpi_processor_remove(struct acpi_device *device, int type); 84 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 85 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 86 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 87 static int acpi_processor_handle_eject(struct acpi_processor *pr); 88 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr); 89 90 91 static const struct acpi_device_id processor_device_ids[] = { 92 {ACPI_PROCESSOR_HID, 0}, 93 {"", 0}, 94 }; 95 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 96 97 static struct acpi_driver acpi_processor_driver = { 98 .name = "processor", 99 .class = ACPI_PROCESSOR_CLASS, 100 .ids = processor_device_ids, 101 .ops = { 102 .add = acpi_processor_add, 103 .remove = acpi_processor_remove, 104 .start = acpi_processor_start, 105 }, 106 }; 107 108 #define INSTALL_NOTIFY_HANDLER 1 109 #define UNINSTALL_NOTIFY_HANDLER 2 110 111 static const struct file_operations acpi_processor_info_fops = { 112 .open = acpi_processor_info_open_fs, 113 .read = seq_read, 114 .llseek = seq_lseek, 115 .release = single_release, 116 }; 117 118 struct acpi_processor *processors[NR_CPUS]; 119 struct acpi_processor_errata errata __read_mostly; 120 121 /* -------------------------------------------------------------------------- 122 Errata Handling 123 -------------------------------------------------------------------------- */ 124 125 static int acpi_processor_errata_piix4(struct pci_dev *dev) 126 { 127 u8 value1 = 0; 128 u8 value2 = 0; 129 130 131 if (!dev) 132 return -EINVAL; 133 134 /* 135 * Note that 'dev' references the PIIX4 ACPI Controller. 136 */ 137 138 switch (dev->revision) { 139 case 0: 140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 141 break; 142 case 1: 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 144 break; 145 case 2: 146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 147 break; 148 case 3: 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 150 break; 151 default: 152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 153 break; 154 } 155 156 switch (dev->revision) { 157 158 case 0: /* PIIX4 A-step */ 159 case 1: /* PIIX4 B-step */ 160 /* 161 * See specification changes #13 ("Manual Throttle Duty Cycle") 162 * and #14 ("Enabling and Disabling Manual Throttle"), plus 163 * erratum #5 ("STPCLK# Deassertion Time") from the January 164 * 2002 PIIX4 specification update. Applies to only older 165 * PIIX4 models. 166 */ 167 errata.piix4.throttle = 1; 168 169 case 2: /* PIIX4E */ 170 case 3: /* PIIX4M */ 171 /* 172 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 173 * Livelock") from the January 2002 PIIX4 specification update. 174 * Applies to all PIIX4 models. 175 */ 176 177 /* 178 * BM-IDE 179 * ------ 180 * Find the PIIX4 IDE Controller and get the Bus Master IDE 181 * Status register address. We'll use this later to read 182 * each IDE controller's DMA status to make sure we catch all 183 * DMA activity. 184 */ 185 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 186 PCI_DEVICE_ID_INTEL_82371AB, 187 PCI_ANY_ID, PCI_ANY_ID, NULL); 188 if (dev) { 189 errata.piix4.bmisx = pci_resource_start(dev, 4); 190 pci_dev_put(dev); 191 } 192 193 /* 194 * Type-F DMA 195 * ---------- 196 * Find the PIIX4 ISA Controller and read the Motherboard 197 * DMA controller's status to see if Type-F (Fast) DMA mode 198 * is enabled (bit 7) on either channel. Note that we'll 199 * disable C3 support if this is enabled, as some legacy 200 * devices won't operate well if fast DMA is disabled. 201 */ 202 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 203 PCI_DEVICE_ID_INTEL_82371AB_0, 204 PCI_ANY_ID, PCI_ANY_ID, NULL); 205 if (dev) { 206 pci_read_config_byte(dev, 0x76, &value1); 207 pci_read_config_byte(dev, 0x77, &value2); 208 if ((value1 & 0x80) || (value2 & 0x80)) 209 errata.piix4.fdma = 1; 210 pci_dev_put(dev); 211 } 212 213 break; 214 } 215 216 if (errata.piix4.bmisx) 217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 218 "Bus master activity detection (BM-IDE) erratum enabled\n")); 219 if (errata.piix4.fdma) 220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 221 "Type-F DMA livelock erratum (C3 disabled)\n")); 222 223 return 0; 224 } 225 226 static int acpi_processor_errata(struct acpi_processor *pr) 227 { 228 int result = 0; 229 struct pci_dev *dev = NULL; 230 231 232 if (!pr) 233 return -EINVAL; 234 235 /* 236 * PIIX4 237 */ 238 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 239 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 240 PCI_ANY_ID, NULL); 241 if (dev) { 242 result = acpi_processor_errata_piix4(dev); 243 pci_dev_put(dev); 244 } 245 246 return result; 247 } 248 249 /* -------------------------------------------------------------------------- 250 Common ACPI processor functions 251 -------------------------------------------------------------------------- */ 252 253 /* 254 * _PDC is required for a BIOS-OS handshake for most of the newer 255 * ACPI processor features. 256 */ 257 static int acpi_processor_set_pdc(struct acpi_processor *pr) 258 { 259 struct acpi_object_list *pdc_in = pr->pdc; 260 acpi_status status = AE_OK; 261 262 263 if (!pdc_in) 264 return status; 265 266 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 267 268 if (ACPI_FAILURE(status)) 269 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 270 "Could not evaluate _PDC, using legacy perf. control...\n")); 271 272 return status; 273 } 274 275 /* -------------------------------------------------------------------------- 276 FS Interface (/proc) 277 -------------------------------------------------------------------------- */ 278 279 static struct proc_dir_entry *acpi_processor_dir = NULL; 280 281 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 282 { 283 struct acpi_processor *pr = seq->private; 284 285 286 if (!pr) 287 goto end; 288 289 seq_printf(seq, "processor id: %d\n" 290 "acpi id: %d\n" 291 "bus mastering control: %s\n" 292 "power management: %s\n" 293 "throttling control: %s\n" 294 "limit interface: %s\n", 295 pr->id, 296 pr->acpi_id, 297 pr->flags.bm_control ? "yes" : "no", 298 pr->flags.power ? "yes" : "no", 299 pr->flags.throttling ? "yes" : "no", 300 pr->flags.limit ? "yes" : "no"); 301 302 end: 303 return 0; 304 } 305 306 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 307 { 308 return single_open(file, acpi_processor_info_seq_show, 309 PDE(inode)->data); 310 } 311 312 static int acpi_processor_add_fs(struct acpi_device *device) 313 { 314 struct proc_dir_entry *entry = NULL; 315 316 317 if (!acpi_device_dir(device)) { 318 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 319 acpi_processor_dir); 320 if (!acpi_device_dir(device)) 321 return -ENODEV; 322 } 323 acpi_device_dir(device)->owner = THIS_MODULE; 324 325 /* 'info' [R] */ 326 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 327 S_IRUGO, acpi_device_dir(device)); 328 if (!entry) 329 return -EIO; 330 else { 331 entry->proc_fops = &acpi_processor_info_fops; 332 entry->data = acpi_driver_data(device); 333 entry->owner = THIS_MODULE; 334 } 335 336 /* 'throttling' [R/W] */ 337 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 338 S_IFREG | S_IRUGO | S_IWUSR, 339 acpi_device_dir(device)); 340 if (!entry) 341 return -EIO; 342 else { 343 entry->proc_fops = &acpi_processor_throttling_fops; 344 entry->data = acpi_driver_data(device); 345 entry->owner = THIS_MODULE; 346 } 347 348 /* 'limit' [R/W] */ 349 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 350 S_IFREG | S_IRUGO | S_IWUSR, 351 acpi_device_dir(device)); 352 if (!entry) 353 return -EIO; 354 else { 355 entry->proc_fops = &acpi_processor_limit_fops; 356 entry->data = acpi_driver_data(device); 357 entry->owner = THIS_MODULE; 358 } 359 360 return 0; 361 } 362 363 static int acpi_processor_remove_fs(struct acpi_device *device) 364 { 365 366 if (acpi_device_dir(device)) { 367 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 368 acpi_device_dir(device)); 369 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 370 acpi_device_dir(device)); 371 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 372 acpi_device_dir(device)); 373 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 374 acpi_device_dir(device) = NULL; 375 } 376 377 return 0; 378 } 379 380 /* Use the acpiid in MADT to map cpus in case of SMP */ 381 382 #ifndef CONFIG_SMP 383 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;} 384 #else 385 386 static struct acpi_table_madt *madt; 387 388 static int map_lapic_id(struct acpi_subtable_header *entry, 389 u32 acpi_id, int *apic_id) 390 { 391 struct acpi_madt_local_apic *lapic = 392 (struct acpi_madt_local_apic *)entry; 393 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 394 lapic->processor_id == acpi_id) { 395 *apic_id = lapic->id; 396 return 1; 397 } 398 return 0; 399 } 400 401 static int map_lsapic_id(struct acpi_subtable_header *entry, 402 u32 acpi_id, int *apic_id) 403 { 404 struct acpi_madt_local_sapic *lsapic = 405 (struct acpi_madt_local_sapic *)entry; 406 /* Only check enabled APICs*/ 407 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 408 /* First check against id */ 409 if (lsapic->processor_id == acpi_id) { 410 *apic_id = (lsapic->id << 8) | lsapic->eid; 411 return 1; 412 /* Check against optional uid */ 413 } else if (entry->length >= 16 && 414 lsapic->uid == acpi_id) { 415 *apic_id = lsapic->uid; 416 return 1; 417 } 418 } 419 return 0; 420 } 421 422 #ifdef CONFIG_IA64 423 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 424 #else 425 #define arch_cpu_to_apicid x86_cpu_to_apicid 426 #endif 427 428 static int map_madt_entry(u32 acpi_id) 429 { 430 unsigned long madt_end, entry; 431 int apic_id = -1; 432 433 if (!madt) 434 return apic_id; 435 436 entry = (unsigned long)madt; 437 madt_end = entry + madt->header.length; 438 439 /* Parse all entries looking for a match. */ 440 441 entry += sizeof(struct acpi_table_madt); 442 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 443 struct acpi_subtable_header *header = 444 (struct acpi_subtable_header *)entry; 445 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 446 if (map_lapic_id(header, acpi_id, &apic_id)) 447 break; 448 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 449 if (map_lsapic_id(header, acpi_id, &apic_id)) 450 break; 451 } 452 entry += header->length; 453 } 454 return apic_id; 455 } 456 457 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 458 { 459 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 460 union acpi_object *obj; 461 struct acpi_subtable_header *header; 462 int apic_id = -1; 463 464 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 465 goto exit; 466 467 if (!buffer.length || !buffer.pointer) 468 goto exit; 469 470 obj = buffer.pointer; 471 if (obj->type != ACPI_TYPE_BUFFER || 472 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 473 goto exit; 474 } 475 476 header = (struct acpi_subtable_header *)obj->buffer.pointer; 477 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 478 map_lapic_id(header, acpi_id, &apic_id); 479 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 480 map_lsapic_id(header, acpi_id, &apic_id); 481 } 482 483 exit: 484 if (buffer.pointer) 485 kfree(buffer.pointer); 486 return apic_id; 487 } 488 489 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 490 { 491 int i; 492 int apic_id = -1; 493 494 apic_id = map_mat_entry(handle, acpi_id); 495 if (apic_id == -1) 496 apic_id = map_madt_entry(acpi_id); 497 if (apic_id == -1) 498 return apic_id; 499 500 for (i = 0; i < NR_CPUS; ++i) { 501 if (arch_cpu_to_apicid[i] == apic_id) 502 return i; 503 } 504 return -1; 505 } 506 #endif 507 508 /* -------------------------------------------------------------------------- 509 Driver Interface 510 -------------------------------------------------------------------------- */ 511 512 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 513 { 514 acpi_status status = 0; 515 union acpi_object object = { 0 }; 516 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 517 int cpu_index; 518 static int cpu0_initialized; 519 520 521 if (!pr) 522 return -EINVAL; 523 524 if (num_online_cpus() > 1) 525 errata.smp = TRUE; 526 527 acpi_processor_errata(pr); 528 529 /* 530 * Check to see if we have bus mastering arbitration control. This 531 * is required for proper C3 usage (to maintain cache coherency). 532 */ 533 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 534 pr->flags.bm_control = 1; 535 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 536 "Bus mastering arbitration control present\n")); 537 } else 538 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 539 "No bus mastering arbitration control\n")); 540 541 /* Check if it is a Device with HID and UID */ 542 if (has_uid) { 543 unsigned long value; 544 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 545 NULL, &value); 546 if (ACPI_FAILURE(status)) { 547 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 548 return -ENODEV; 549 } 550 pr->acpi_id = value; 551 } else { 552 /* 553 * Evalute the processor object. Note that it is common on SMP to 554 * have the first (boot) processor with a valid PBLK address while 555 * all others have a NULL address. 556 */ 557 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 558 if (ACPI_FAILURE(status)) { 559 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 560 return -ENODEV; 561 } 562 563 /* 564 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 565 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 566 */ 567 pr->acpi_id = object.processor.proc_id; 568 } 569 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 570 571 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 572 if (!cpu0_initialized && (cpu_index == -1) && 573 (num_online_cpus() == 1)) { 574 cpu_index = 0; 575 } 576 577 cpu0_initialized = 1; 578 579 pr->id = cpu_index; 580 581 /* 582 * Extra Processor objects may be enumerated on MP systems with 583 * less than the max # of CPUs. They should be ignored _iff 584 * they are physically not present. 585 */ 586 if (pr->id == -1) { 587 if (ACPI_FAILURE 588 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 589 return -ENODEV; 590 } 591 } 592 593 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 594 pr->acpi_id)); 595 596 if (!object.processor.pblk_address) 597 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 598 else if (object.processor.pblk_length != 6) 599 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 600 object.processor.pblk_length); 601 else { 602 pr->throttling.address = object.processor.pblk_address; 603 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 604 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 605 606 pr->pblk = object.processor.pblk_address; 607 608 /* 609 * We don't care about error returns - we just try to mark 610 * these reserved so that nobody else is confused into thinking 611 * that this region might be unused.. 612 * 613 * (In particular, allocating the IO range for Cardbus) 614 */ 615 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 616 } 617 618 #ifdef CONFIG_CPU_FREQ 619 acpi_processor_ppc_has_changed(pr); 620 #endif 621 acpi_processor_get_throttling_info(pr); 622 acpi_processor_get_limit_info(pr); 623 624 return 0; 625 } 626 627 static void *processor_device_array[NR_CPUS]; 628 629 static int __cpuinit acpi_processor_start(struct acpi_device *device) 630 { 631 int result = 0; 632 acpi_status status = AE_OK; 633 struct acpi_processor *pr; 634 635 636 pr = acpi_driver_data(device); 637 638 result = acpi_processor_get_info(pr, device->flags.unique_id); 639 if (result) { 640 /* Processor is physically not present */ 641 return 0; 642 } 643 644 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 645 646 /* 647 * Buggy BIOS check 648 * ACPI id of processors can be reported wrongly by the BIOS. 649 * Don't trust it blindly 650 */ 651 if (processor_device_array[pr->id] != NULL && 652 processor_device_array[pr->id] != device) { 653 printk(KERN_WARNING "BIOS reported wrong ACPI id" 654 "for the processor\n"); 655 return -ENODEV; 656 } 657 processor_device_array[pr->id] = device; 658 659 processors[pr->id] = pr; 660 661 result = acpi_processor_add_fs(device); 662 if (result) 663 goto end; 664 665 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 666 acpi_processor_notify, pr); 667 668 /* _PDC call should be done before doing anything else (if reqd.). */ 669 arch_acpi_processor_init_pdc(pr); 670 acpi_processor_set_pdc(pr); 671 672 acpi_processor_power_init(pr, device); 673 674 if (pr->flags.throttling) { 675 printk(KERN_INFO PREFIX "%s [%s] (supports", 676 acpi_device_name(device), acpi_device_bid(device)); 677 printk(" %d throttling states", pr->throttling.state_count); 678 printk(")\n"); 679 } 680 681 end: 682 683 return result; 684 } 685 686 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 687 { 688 struct acpi_processor *pr = data; 689 struct acpi_device *device = NULL; 690 691 692 if (!pr) 693 return; 694 695 if (acpi_bus_get_device(pr->handle, &device)) 696 return; 697 698 switch (event) { 699 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 700 acpi_processor_ppc_has_changed(pr); 701 acpi_bus_generate_event(device, event, 702 pr->performance_platform_limit); 703 break; 704 case ACPI_PROCESSOR_NOTIFY_POWER: 705 acpi_processor_cst_has_changed(pr); 706 acpi_bus_generate_event(device, event, 0); 707 break; 708 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 709 acpi_processor_tstate_has_changed(pr); 710 acpi_bus_generate_event(device, event, 0); 711 default: 712 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 713 "Unsupported event [0x%x]\n", event)); 714 break; 715 } 716 717 return; 718 } 719 720 static int acpi_processor_add(struct acpi_device *device) 721 { 722 struct acpi_processor *pr = NULL; 723 724 725 if (!device) 726 return -EINVAL; 727 728 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 729 if (!pr) 730 return -ENOMEM; 731 732 pr->handle = device->handle; 733 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 734 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 735 acpi_driver_data(device) = pr; 736 737 return 0; 738 } 739 740 static int acpi_processor_remove(struct acpi_device *device, int type) 741 { 742 acpi_status status = AE_OK; 743 struct acpi_processor *pr = NULL; 744 745 746 if (!device || !acpi_driver_data(device)) 747 return -EINVAL; 748 749 pr = acpi_driver_data(device); 750 751 if (pr->id >= NR_CPUS) { 752 kfree(pr); 753 return 0; 754 } 755 756 if (type == ACPI_BUS_REMOVAL_EJECT) { 757 if (acpi_processor_handle_eject(pr)) 758 return -EINVAL; 759 } 760 761 acpi_processor_power_exit(pr, device); 762 763 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 764 acpi_processor_notify); 765 766 acpi_processor_remove_fs(device); 767 768 processors[pr->id] = NULL; 769 770 kfree(pr); 771 772 return 0; 773 } 774 775 #ifdef CONFIG_ACPI_HOTPLUG_CPU 776 /**************************************************************************** 777 * Acpi processor hotplug support * 778 ****************************************************************************/ 779 780 static int is_processor_present(acpi_handle handle); 781 782 static int is_processor_present(acpi_handle handle) 783 { 784 acpi_status status; 785 unsigned long sta = 0; 786 787 788 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 789 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) { 790 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 791 return 0; 792 } 793 return 1; 794 } 795 796 static 797 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 798 { 799 acpi_handle phandle; 800 struct acpi_device *pdev; 801 struct acpi_processor *pr; 802 803 804 if (acpi_get_parent(handle, &phandle)) { 805 return -ENODEV; 806 } 807 808 if (acpi_bus_get_device(phandle, &pdev)) { 809 return -ENODEV; 810 } 811 812 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 813 return -ENODEV; 814 } 815 816 acpi_bus_start(*device); 817 818 pr = acpi_driver_data(*device); 819 if (!pr) 820 return -ENODEV; 821 822 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 823 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 824 } 825 return 0; 826 } 827 828 static void 829 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 830 { 831 struct acpi_processor *pr; 832 struct acpi_device *device = NULL; 833 int result; 834 835 836 switch (event) { 837 case ACPI_NOTIFY_BUS_CHECK: 838 case ACPI_NOTIFY_DEVICE_CHECK: 839 printk("Processor driver received %s event\n", 840 (event == ACPI_NOTIFY_BUS_CHECK) ? 841 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 842 843 if (!is_processor_present(handle)) 844 break; 845 846 if (acpi_bus_get_device(handle, &device)) { 847 result = acpi_processor_device_add(handle, &device); 848 if (result) 849 printk(KERN_ERR PREFIX 850 "Unable to add the device\n"); 851 break; 852 } 853 854 pr = acpi_driver_data(device); 855 if (!pr) { 856 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 857 break; 858 } 859 860 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 861 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 862 break; 863 } 864 865 result = acpi_processor_start(device); 866 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 867 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 868 } else { 869 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 870 acpi_device_bid(device)); 871 } 872 break; 873 case ACPI_NOTIFY_EJECT_REQUEST: 874 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 875 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 876 877 if (acpi_bus_get_device(handle, &device)) { 878 printk(KERN_ERR PREFIX 879 "Device don't exist, dropping EJECT\n"); 880 break; 881 } 882 pr = acpi_driver_data(device); 883 if (!pr) { 884 printk(KERN_ERR PREFIX 885 "Driver data is NULL, dropping EJECT\n"); 886 return; 887 } 888 889 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 890 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 891 break; 892 default: 893 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 894 "Unsupported event [0x%x]\n", event)); 895 break; 896 } 897 898 return; 899 } 900 901 static acpi_status 902 processor_walk_namespace_cb(acpi_handle handle, 903 u32 lvl, void *context, void **rv) 904 { 905 acpi_status status; 906 int *action = context; 907 acpi_object_type type = 0; 908 909 status = acpi_get_type(handle, &type); 910 if (ACPI_FAILURE(status)) 911 return (AE_OK); 912 913 if (type != ACPI_TYPE_PROCESSOR) 914 return (AE_OK); 915 916 switch (*action) { 917 case INSTALL_NOTIFY_HANDLER: 918 acpi_install_notify_handler(handle, 919 ACPI_SYSTEM_NOTIFY, 920 acpi_processor_hotplug_notify, 921 NULL); 922 break; 923 case UNINSTALL_NOTIFY_HANDLER: 924 acpi_remove_notify_handler(handle, 925 ACPI_SYSTEM_NOTIFY, 926 acpi_processor_hotplug_notify); 927 break; 928 default: 929 break; 930 } 931 932 return (AE_OK); 933 } 934 935 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 936 { 937 938 if (!is_processor_present(handle)) { 939 return AE_ERROR; 940 } 941 942 if (acpi_map_lsapic(handle, p_cpu)) 943 return AE_ERROR; 944 945 if (arch_register_cpu(*p_cpu)) { 946 acpi_unmap_lsapic(*p_cpu); 947 return AE_ERROR; 948 } 949 950 return AE_OK; 951 } 952 953 static int acpi_processor_handle_eject(struct acpi_processor *pr) 954 { 955 if (cpu_online(pr->id)) { 956 return (-EINVAL); 957 } 958 arch_unregister_cpu(pr->id); 959 acpi_unmap_lsapic(pr->id); 960 return (0); 961 } 962 #else 963 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 964 { 965 return AE_ERROR; 966 } 967 static int acpi_processor_handle_eject(struct acpi_processor *pr) 968 { 969 return (-EINVAL); 970 } 971 #endif 972 973 static 974 void acpi_processor_install_hotplug_notify(void) 975 { 976 #ifdef CONFIG_ACPI_HOTPLUG_CPU 977 int action = INSTALL_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 static 986 void acpi_processor_uninstall_hotplug_notify(void) 987 { 988 #ifdef CONFIG_ACPI_HOTPLUG_CPU 989 int action = UNINSTALL_NOTIFY_HANDLER; 990 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 991 ACPI_ROOT_OBJECT, 992 ACPI_UINT32_MAX, 993 processor_walk_namespace_cb, &action, NULL); 994 #endif 995 } 996 997 /* 998 * We keep the driver loaded even when ACPI is not running. 999 * This is needed for the powernow-k8 driver, that works even without 1000 * ACPI, but needs symbols from this driver 1001 */ 1002 1003 static int __init acpi_processor_init(void) 1004 { 1005 int result = 0; 1006 1007 1008 memset(&processors, 0, sizeof(processors)); 1009 memset(&errata, 0, sizeof(errata)); 1010 1011 #ifdef CONFIG_SMP 1012 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1013 (struct acpi_table_header **)&madt))) 1014 madt = NULL; 1015 #endif 1016 1017 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1018 if (!acpi_processor_dir) 1019 return -ENOMEM; 1020 acpi_processor_dir->owner = THIS_MODULE; 1021 1022 result = acpi_bus_register_driver(&acpi_processor_driver); 1023 if (result < 0) { 1024 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1025 return result; 1026 } 1027 1028 acpi_processor_install_hotplug_notify(); 1029 1030 acpi_thermal_cpufreq_init(); 1031 1032 acpi_processor_ppc_init(); 1033 1034 return 0; 1035 } 1036 1037 static void __exit acpi_processor_exit(void) 1038 { 1039 1040 acpi_processor_ppc_exit(); 1041 1042 acpi_thermal_cpufreq_exit(); 1043 1044 acpi_processor_uninstall_hotplug_notify(); 1045 1046 acpi_bus_unregister_driver(&acpi_processor_driver); 1047 1048 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1049 1050 return; 1051 } 1052 1053 module_init(acpi_processor_init); 1054 module_exit(acpi_processor_exit); 1055 1056 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1057 1058 MODULE_ALIAS("processor"); 1059