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 .suspend = acpi_processor_suspend, 106 .resume = acpi_processor_resume, 107 }, 108 }; 109 110 #define INSTALL_NOTIFY_HANDLER 1 111 #define UNINSTALL_NOTIFY_HANDLER 2 112 113 static const struct file_operations acpi_processor_info_fops = { 114 .open = acpi_processor_info_open_fs, 115 .read = seq_read, 116 .llseek = seq_lseek, 117 .release = single_release, 118 }; 119 120 struct acpi_processor *processors[NR_CPUS]; 121 struct acpi_processor_errata errata __read_mostly; 122 123 /* -------------------------------------------------------------------------- 124 Errata Handling 125 -------------------------------------------------------------------------- */ 126 127 static int acpi_processor_errata_piix4(struct pci_dev *dev) 128 { 129 u8 value1 = 0; 130 u8 value2 = 0; 131 132 133 if (!dev) 134 return -EINVAL; 135 136 /* 137 * Note that 'dev' references the PIIX4 ACPI Controller. 138 */ 139 140 switch (dev->revision) { 141 case 0: 142 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 143 break; 144 case 1: 145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 146 break; 147 case 2: 148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 149 break; 150 case 3: 151 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 152 break; 153 default: 154 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 155 break; 156 } 157 158 switch (dev->revision) { 159 160 case 0: /* PIIX4 A-step */ 161 case 1: /* PIIX4 B-step */ 162 /* 163 * See specification changes #13 ("Manual Throttle Duty Cycle") 164 * and #14 ("Enabling and Disabling Manual Throttle"), plus 165 * erratum #5 ("STPCLK# Deassertion Time") from the January 166 * 2002 PIIX4 specification update. Applies to only older 167 * PIIX4 models. 168 */ 169 errata.piix4.throttle = 1; 170 171 case 2: /* PIIX4E */ 172 case 3: /* PIIX4M */ 173 /* 174 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 175 * Livelock") from the January 2002 PIIX4 specification update. 176 * Applies to all PIIX4 models. 177 */ 178 179 /* 180 * BM-IDE 181 * ------ 182 * Find the PIIX4 IDE Controller and get the Bus Master IDE 183 * Status register address. We'll use this later to read 184 * each IDE controller's DMA status to make sure we catch all 185 * DMA activity. 186 */ 187 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 188 PCI_DEVICE_ID_INTEL_82371AB, 189 PCI_ANY_ID, PCI_ANY_ID, NULL); 190 if (dev) { 191 errata.piix4.bmisx = pci_resource_start(dev, 4); 192 pci_dev_put(dev); 193 } 194 195 /* 196 * Type-F DMA 197 * ---------- 198 * Find the PIIX4 ISA Controller and read the Motherboard 199 * DMA controller's status to see if Type-F (Fast) DMA mode 200 * is enabled (bit 7) on either channel. Note that we'll 201 * disable C3 support if this is enabled, as some legacy 202 * devices won't operate well if fast DMA is disabled. 203 */ 204 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 205 PCI_DEVICE_ID_INTEL_82371AB_0, 206 PCI_ANY_ID, PCI_ANY_ID, NULL); 207 if (dev) { 208 pci_read_config_byte(dev, 0x76, &value1); 209 pci_read_config_byte(dev, 0x77, &value2); 210 if ((value1 & 0x80) || (value2 & 0x80)) 211 errata.piix4.fdma = 1; 212 pci_dev_put(dev); 213 } 214 215 break; 216 } 217 218 if (errata.piix4.bmisx) 219 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 220 "Bus master activity detection (BM-IDE) erratum enabled\n")); 221 if (errata.piix4.fdma) 222 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 223 "Type-F DMA livelock erratum (C3 disabled)\n")); 224 225 return 0; 226 } 227 228 static int acpi_processor_errata(struct acpi_processor *pr) 229 { 230 int result = 0; 231 struct pci_dev *dev = NULL; 232 233 234 if (!pr) 235 return -EINVAL; 236 237 /* 238 * PIIX4 239 */ 240 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 241 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 242 PCI_ANY_ID, NULL); 243 if (dev) { 244 result = acpi_processor_errata_piix4(dev); 245 pci_dev_put(dev); 246 } 247 248 return result; 249 } 250 251 /* -------------------------------------------------------------------------- 252 Common ACPI processor functions 253 -------------------------------------------------------------------------- */ 254 255 /* 256 * _PDC is required for a BIOS-OS handshake for most of the newer 257 * ACPI processor features. 258 */ 259 static int acpi_processor_set_pdc(struct acpi_processor *pr) 260 { 261 struct acpi_object_list *pdc_in = pr->pdc; 262 acpi_status status = AE_OK; 263 264 265 if (!pdc_in) 266 return status; 267 268 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 269 270 if (ACPI_FAILURE(status)) 271 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 272 "Could not evaluate _PDC, using legacy perf. control...\n")); 273 274 return status; 275 } 276 277 /* -------------------------------------------------------------------------- 278 FS Interface (/proc) 279 -------------------------------------------------------------------------- */ 280 281 static struct proc_dir_entry *acpi_processor_dir = NULL; 282 283 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 284 { 285 struct acpi_processor *pr = seq->private; 286 287 288 if (!pr) 289 goto end; 290 291 seq_printf(seq, "processor id: %d\n" 292 "acpi id: %d\n" 293 "bus mastering control: %s\n" 294 "power management: %s\n" 295 "throttling control: %s\n" 296 "limit interface: %s\n", 297 pr->id, 298 pr->acpi_id, 299 pr->flags.bm_control ? "yes" : "no", 300 pr->flags.power ? "yes" : "no", 301 pr->flags.throttling ? "yes" : "no", 302 pr->flags.limit ? "yes" : "no"); 303 304 end: 305 return 0; 306 } 307 308 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 309 { 310 return single_open(file, acpi_processor_info_seq_show, 311 PDE(inode)->data); 312 } 313 314 static int acpi_processor_add_fs(struct acpi_device *device) 315 { 316 struct proc_dir_entry *entry = NULL; 317 318 319 if (!acpi_device_dir(device)) { 320 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 321 acpi_processor_dir); 322 if (!acpi_device_dir(device)) 323 return -ENODEV; 324 } 325 acpi_device_dir(device)->owner = THIS_MODULE; 326 327 /* 'info' [R] */ 328 entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, 329 S_IRUGO, acpi_device_dir(device)); 330 if (!entry) 331 return -EIO; 332 else { 333 entry->proc_fops = &acpi_processor_info_fops; 334 entry->data = acpi_driver_data(device); 335 entry->owner = THIS_MODULE; 336 } 337 338 /* 'throttling' [R/W] */ 339 entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 340 S_IFREG | S_IRUGO | S_IWUSR, 341 acpi_device_dir(device)); 342 if (!entry) 343 return -EIO; 344 else { 345 entry->proc_fops = &acpi_processor_throttling_fops; 346 entry->data = acpi_driver_data(device); 347 entry->owner = THIS_MODULE; 348 } 349 350 /* 'limit' [R/W] */ 351 entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 352 S_IFREG | S_IRUGO | S_IWUSR, 353 acpi_device_dir(device)); 354 if (!entry) 355 return -EIO; 356 else { 357 entry->proc_fops = &acpi_processor_limit_fops; 358 entry->data = acpi_driver_data(device); 359 entry->owner = THIS_MODULE; 360 } 361 362 return 0; 363 } 364 365 static int acpi_processor_remove_fs(struct acpi_device *device) 366 { 367 368 if (acpi_device_dir(device)) { 369 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 370 acpi_device_dir(device)); 371 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 372 acpi_device_dir(device)); 373 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 374 acpi_device_dir(device)); 375 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 376 acpi_device_dir(device) = NULL; 377 } 378 379 return 0; 380 } 381 382 /* Use the acpiid in MADT to map cpus in case of SMP */ 383 384 #ifndef CONFIG_SMP 385 static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;} 386 #else 387 388 static struct acpi_table_madt *madt; 389 390 static int map_lapic_id(struct acpi_subtable_header *entry, 391 u32 acpi_id, int *apic_id) 392 { 393 struct acpi_madt_local_apic *lapic = 394 (struct acpi_madt_local_apic *)entry; 395 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 396 lapic->processor_id == acpi_id) { 397 *apic_id = lapic->id; 398 return 1; 399 } 400 return 0; 401 } 402 403 static int map_lsapic_id(struct acpi_subtable_header *entry, 404 u32 acpi_id, int *apic_id) 405 { 406 struct acpi_madt_local_sapic *lsapic = 407 (struct acpi_madt_local_sapic *)entry; 408 /* Only check enabled APICs*/ 409 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 410 /* First check against id */ 411 if (lsapic->processor_id == acpi_id) { 412 *apic_id = (lsapic->id << 8) | lsapic->eid; 413 return 1; 414 /* Check against optional uid */ 415 } else if (entry->length >= 16 && 416 lsapic->uid == acpi_id) { 417 *apic_id = lsapic->uid; 418 return 1; 419 } 420 } 421 return 0; 422 } 423 424 #ifdef CONFIG_IA64 425 #define arch_cpu_to_apicid ia64_cpu_to_sapicid 426 #else 427 #define arch_cpu_to_apicid x86_cpu_to_apicid 428 #endif 429 430 static int map_madt_entry(u32 acpi_id) 431 { 432 unsigned long madt_end, entry; 433 int apic_id = -1; 434 435 if (!madt) 436 return apic_id; 437 438 entry = (unsigned long)madt; 439 madt_end = entry + madt->header.length; 440 441 /* Parse all entries looking for a match. */ 442 443 entry += sizeof(struct acpi_table_madt); 444 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 445 struct acpi_subtable_header *header = 446 (struct acpi_subtable_header *)entry; 447 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 448 if (map_lapic_id(header, acpi_id, &apic_id)) 449 break; 450 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 451 if (map_lsapic_id(header, acpi_id, &apic_id)) 452 break; 453 } 454 entry += header->length; 455 } 456 return apic_id; 457 } 458 459 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 460 { 461 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 462 union acpi_object *obj; 463 struct acpi_subtable_header *header; 464 int apic_id = -1; 465 466 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 467 goto exit; 468 469 if (!buffer.length || !buffer.pointer) 470 goto exit; 471 472 obj = buffer.pointer; 473 if (obj->type != ACPI_TYPE_BUFFER || 474 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 475 goto exit; 476 } 477 478 header = (struct acpi_subtable_header *)obj->buffer.pointer; 479 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 480 map_lapic_id(header, acpi_id, &apic_id); 481 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 482 map_lsapic_id(header, acpi_id, &apic_id); 483 } 484 485 exit: 486 if (buffer.pointer) 487 kfree(buffer.pointer); 488 return apic_id; 489 } 490 491 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 492 { 493 int i; 494 int apic_id = -1; 495 496 apic_id = map_mat_entry(handle, acpi_id); 497 if (apic_id == -1) 498 apic_id = map_madt_entry(acpi_id); 499 if (apic_id == -1) 500 return apic_id; 501 502 for (i = 0; i < NR_CPUS; ++i) { 503 if (arch_cpu_to_apicid[i] == apic_id) 504 return i; 505 } 506 return -1; 507 } 508 #endif 509 510 /* -------------------------------------------------------------------------- 511 Driver Interface 512 -------------------------------------------------------------------------- */ 513 514 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 515 { 516 acpi_status status = 0; 517 union acpi_object object = { 0 }; 518 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 519 int cpu_index; 520 static int cpu0_initialized; 521 522 523 if (!pr) 524 return -EINVAL; 525 526 if (num_online_cpus() > 1) 527 errata.smp = TRUE; 528 529 acpi_processor_errata(pr); 530 531 /* 532 * Check to see if we have bus mastering arbitration control. This 533 * is required for proper C3 usage (to maintain cache coherency). 534 */ 535 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 536 pr->flags.bm_control = 1; 537 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 538 "Bus mastering arbitration control present\n")); 539 } else 540 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 541 "No bus mastering arbitration control\n")); 542 543 /* Check if it is a Device with HID and UID */ 544 if (has_uid) { 545 unsigned long value; 546 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 547 NULL, &value); 548 if (ACPI_FAILURE(status)) { 549 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 550 return -ENODEV; 551 } 552 pr->acpi_id = value; 553 } else { 554 /* 555 * Evalute the processor object. Note that it is common on SMP to 556 * have the first (boot) processor with a valid PBLK address while 557 * all others have a NULL address. 558 */ 559 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 560 if (ACPI_FAILURE(status)) { 561 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 562 return -ENODEV; 563 } 564 565 /* 566 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 567 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 568 */ 569 pr->acpi_id = object.processor.proc_id; 570 } 571 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 572 573 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 574 if (!cpu0_initialized && (cpu_index == -1) && 575 (num_online_cpus() == 1)) { 576 cpu_index = 0; 577 } 578 579 cpu0_initialized = 1; 580 581 pr->id = cpu_index; 582 583 /* 584 * Extra Processor objects may be enumerated on MP systems with 585 * less than the max # of CPUs. They should be ignored _iff 586 * they are physically not present. 587 */ 588 if (pr->id == -1) { 589 if (ACPI_FAILURE 590 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 591 return -ENODEV; 592 } 593 } 594 595 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 596 pr->acpi_id)); 597 598 if (!object.processor.pblk_address) 599 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 600 else if (object.processor.pblk_length != 6) 601 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 602 object.processor.pblk_length); 603 else { 604 pr->throttling.address = object.processor.pblk_address; 605 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 606 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 607 608 pr->pblk = object.processor.pblk_address; 609 610 /* 611 * We don't care about error returns - we just try to mark 612 * these reserved so that nobody else is confused into thinking 613 * that this region might be unused.. 614 * 615 * (In particular, allocating the IO range for Cardbus) 616 */ 617 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 618 } 619 620 #ifdef CONFIG_CPU_FREQ 621 acpi_processor_ppc_has_changed(pr); 622 #endif 623 acpi_processor_get_throttling_info(pr); 624 acpi_processor_get_limit_info(pr); 625 626 return 0; 627 } 628 629 static void *processor_device_array[NR_CPUS]; 630 631 static int __cpuinit acpi_processor_start(struct acpi_device *device) 632 { 633 int result = 0; 634 acpi_status status = AE_OK; 635 struct acpi_processor *pr; 636 637 638 pr = acpi_driver_data(device); 639 640 result = acpi_processor_get_info(pr, device->flags.unique_id); 641 if (result) { 642 /* Processor is physically not present */ 643 return 0; 644 } 645 646 BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); 647 648 /* 649 * Buggy BIOS check 650 * ACPI id of processors can be reported wrongly by the BIOS. 651 * Don't trust it blindly 652 */ 653 if (processor_device_array[pr->id] != NULL && 654 processor_device_array[pr->id] != device) { 655 printk(KERN_WARNING "BIOS reported wrong ACPI id" 656 "for the processor\n"); 657 return -ENODEV; 658 } 659 processor_device_array[pr->id] = device; 660 661 processors[pr->id] = pr; 662 663 result = acpi_processor_add_fs(device); 664 if (result) 665 goto end; 666 667 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 668 acpi_processor_notify, pr); 669 670 /* _PDC call should be done before doing anything else (if reqd.). */ 671 arch_acpi_processor_init_pdc(pr); 672 acpi_processor_set_pdc(pr); 673 674 acpi_processor_power_init(pr, device); 675 676 if (pr->flags.throttling) { 677 printk(KERN_INFO PREFIX "%s [%s] (supports", 678 acpi_device_name(device), acpi_device_bid(device)); 679 printk(" %d throttling states", pr->throttling.state_count); 680 printk(")\n"); 681 } 682 683 end: 684 685 return result; 686 } 687 688 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 689 { 690 struct acpi_processor *pr = data; 691 struct acpi_device *device = NULL; 692 693 694 if (!pr) 695 return; 696 697 if (acpi_bus_get_device(pr->handle, &device)) 698 return; 699 700 switch (event) { 701 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 702 acpi_processor_ppc_has_changed(pr); 703 acpi_bus_generate_proc_event(device, event, 704 pr->performance_platform_limit); 705 acpi_bus_generate_netlink_event(device->pnp.device_class, 706 device->dev.bus_id, event, 707 pr->performance_platform_limit); 708 break; 709 case ACPI_PROCESSOR_NOTIFY_POWER: 710 acpi_processor_cst_has_changed(pr); 711 acpi_bus_generate_proc_event(device, event, 0); 712 acpi_bus_generate_netlink_event(device->pnp.device_class, 713 device->dev.bus_id, event, 0); 714 break; 715 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 716 acpi_processor_tstate_has_changed(pr); 717 acpi_bus_generate_proc_event(device, event, 0); 718 acpi_bus_generate_netlink_event(device->pnp.device_class, 719 device->dev.bus_id, event, 0); 720 default: 721 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 722 "Unsupported event [0x%x]\n", event)); 723 break; 724 } 725 726 return; 727 } 728 729 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 730 unsigned long action, void *hcpu) 731 { 732 unsigned int cpu = (unsigned long)hcpu; 733 struct acpi_processor *pr = processors[cpu]; 734 735 if (action == CPU_ONLINE && pr) { 736 acpi_processor_ppc_has_changed(pr); 737 acpi_processor_cst_has_changed(pr); 738 acpi_processor_tstate_has_changed(pr); 739 } 740 return NOTIFY_OK; 741 } 742 743 static struct notifier_block acpi_cpu_notifier = 744 { 745 .notifier_call = acpi_cpu_soft_notify, 746 }; 747 748 static int acpi_processor_add(struct acpi_device *device) 749 { 750 struct acpi_processor *pr = NULL; 751 752 753 if (!device) 754 return -EINVAL; 755 756 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 757 if (!pr) 758 return -ENOMEM; 759 760 pr->handle = device->handle; 761 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 762 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 763 acpi_driver_data(device) = pr; 764 765 return 0; 766 } 767 768 static int acpi_processor_remove(struct acpi_device *device, int type) 769 { 770 acpi_status status = AE_OK; 771 struct acpi_processor *pr = NULL; 772 773 774 if (!device || !acpi_driver_data(device)) 775 return -EINVAL; 776 777 pr = acpi_driver_data(device); 778 779 if (pr->id >= NR_CPUS) { 780 kfree(pr); 781 return 0; 782 } 783 784 if (type == ACPI_BUS_REMOVAL_EJECT) { 785 if (acpi_processor_handle_eject(pr)) 786 return -EINVAL; 787 } 788 789 acpi_processor_power_exit(pr, device); 790 791 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 792 acpi_processor_notify); 793 794 acpi_processor_remove_fs(device); 795 796 processors[pr->id] = NULL; 797 798 kfree(pr); 799 800 return 0; 801 } 802 803 #ifdef CONFIG_ACPI_HOTPLUG_CPU 804 /**************************************************************************** 805 * Acpi processor hotplug support * 806 ****************************************************************************/ 807 808 static int is_processor_present(acpi_handle handle); 809 810 static int is_processor_present(acpi_handle handle) 811 { 812 acpi_status status; 813 unsigned long sta = 0; 814 815 816 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 817 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) { 818 ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); 819 return 0; 820 } 821 return 1; 822 } 823 824 static 825 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 826 { 827 acpi_handle phandle; 828 struct acpi_device *pdev; 829 struct acpi_processor *pr; 830 831 832 if (acpi_get_parent(handle, &phandle)) { 833 return -ENODEV; 834 } 835 836 if (acpi_bus_get_device(phandle, &pdev)) { 837 return -ENODEV; 838 } 839 840 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 841 return -ENODEV; 842 } 843 844 acpi_bus_start(*device); 845 846 pr = acpi_driver_data(*device); 847 if (!pr) 848 return -ENODEV; 849 850 if ((pr->id >= 0) && (pr->id < NR_CPUS)) { 851 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 852 } 853 return 0; 854 } 855 856 static void 857 acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 858 { 859 struct acpi_processor *pr; 860 struct acpi_device *device = NULL; 861 int result; 862 863 864 switch (event) { 865 case ACPI_NOTIFY_BUS_CHECK: 866 case ACPI_NOTIFY_DEVICE_CHECK: 867 printk("Processor driver received %s event\n", 868 (event == ACPI_NOTIFY_BUS_CHECK) ? 869 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 870 871 if (!is_processor_present(handle)) 872 break; 873 874 if (acpi_bus_get_device(handle, &device)) { 875 result = acpi_processor_device_add(handle, &device); 876 if (result) 877 printk(KERN_ERR PREFIX 878 "Unable to add the device\n"); 879 break; 880 } 881 882 pr = acpi_driver_data(device); 883 if (!pr) { 884 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 885 break; 886 } 887 888 if (pr->id >= 0 && (pr->id < NR_CPUS)) { 889 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 890 break; 891 } 892 893 result = acpi_processor_start(device); 894 if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { 895 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 896 } else { 897 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 898 acpi_device_bid(device)); 899 } 900 break; 901 case ACPI_NOTIFY_EJECT_REQUEST: 902 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 903 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 904 905 if (acpi_bus_get_device(handle, &device)) { 906 printk(KERN_ERR PREFIX 907 "Device don't exist, dropping EJECT\n"); 908 break; 909 } 910 pr = acpi_driver_data(device); 911 if (!pr) { 912 printk(KERN_ERR PREFIX 913 "Driver data is NULL, dropping EJECT\n"); 914 return; 915 } 916 917 if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) 918 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 919 break; 920 default: 921 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 922 "Unsupported event [0x%x]\n", event)); 923 break; 924 } 925 926 return; 927 } 928 929 static acpi_status 930 processor_walk_namespace_cb(acpi_handle handle, 931 u32 lvl, void *context, void **rv) 932 { 933 acpi_status status; 934 int *action = context; 935 acpi_object_type type = 0; 936 937 status = acpi_get_type(handle, &type); 938 if (ACPI_FAILURE(status)) 939 return (AE_OK); 940 941 if (type != ACPI_TYPE_PROCESSOR) 942 return (AE_OK); 943 944 switch (*action) { 945 case INSTALL_NOTIFY_HANDLER: 946 acpi_install_notify_handler(handle, 947 ACPI_SYSTEM_NOTIFY, 948 acpi_processor_hotplug_notify, 949 NULL); 950 break; 951 case UNINSTALL_NOTIFY_HANDLER: 952 acpi_remove_notify_handler(handle, 953 ACPI_SYSTEM_NOTIFY, 954 acpi_processor_hotplug_notify); 955 break; 956 default: 957 break; 958 } 959 960 return (AE_OK); 961 } 962 963 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 964 { 965 966 if (!is_processor_present(handle)) { 967 return AE_ERROR; 968 } 969 970 if (acpi_map_lsapic(handle, p_cpu)) 971 return AE_ERROR; 972 973 if (arch_register_cpu(*p_cpu)) { 974 acpi_unmap_lsapic(*p_cpu); 975 return AE_ERROR; 976 } 977 978 return AE_OK; 979 } 980 981 static int acpi_processor_handle_eject(struct acpi_processor *pr) 982 { 983 if (cpu_online(pr->id)) { 984 return (-EINVAL); 985 } 986 arch_unregister_cpu(pr->id); 987 acpi_unmap_lsapic(pr->id); 988 return (0); 989 } 990 #else 991 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 992 { 993 return AE_ERROR; 994 } 995 static int acpi_processor_handle_eject(struct acpi_processor *pr) 996 { 997 return (-EINVAL); 998 } 999 #endif 1000 1001 static 1002 void acpi_processor_install_hotplug_notify(void) 1003 { 1004 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1005 int action = INSTALL_NOTIFY_HANDLER; 1006 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1007 ACPI_ROOT_OBJECT, 1008 ACPI_UINT32_MAX, 1009 processor_walk_namespace_cb, &action, NULL); 1010 #endif 1011 register_hotcpu_notifier(&acpi_cpu_notifier); 1012 } 1013 1014 static 1015 void acpi_processor_uninstall_hotplug_notify(void) 1016 { 1017 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1018 int action = UNINSTALL_NOTIFY_HANDLER; 1019 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1020 ACPI_ROOT_OBJECT, 1021 ACPI_UINT32_MAX, 1022 processor_walk_namespace_cb, &action, NULL); 1023 #endif 1024 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1025 } 1026 1027 /* 1028 * We keep the driver loaded even when ACPI is not running. 1029 * This is needed for the powernow-k8 driver, that works even without 1030 * ACPI, but needs symbols from this driver 1031 */ 1032 1033 static int __init acpi_processor_init(void) 1034 { 1035 int result = 0; 1036 1037 1038 memset(&processors, 0, sizeof(processors)); 1039 memset(&errata, 0, sizeof(errata)); 1040 1041 #ifdef CONFIG_SMP 1042 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1043 (struct acpi_table_header **)&madt))) 1044 madt = NULL; 1045 #endif 1046 1047 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1048 if (!acpi_processor_dir) 1049 return -ENOMEM; 1050 acpi_processor_dir->owner = THIS_MODULE; 1051 1052 result = acpi_bus_register_driver(&acpi_processor_driver); 1053 if (result < 0) { 1054 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1055 return result; 1056 } 1057 1058 acpi_processor_install_hotplug_notify(); 1059 1060 acpi_thermal_cpufreq_init(); 1061 1062 acpi_processor_ppc_init(); 1063 1064 return 0; 1065 } 1066 1067 static void __exit acpi_processor_exit(void) 1068 { 1069 1070 acpi_processor_ppc_exit(); 1071 1072 acpi_thermal_cpufreq_exit(); 1073 1074 acpi_processor_uninstall_hotplug_notify(); 1075 1076 acpi_bus_unregister_driver(&acpi_processor_driver); 1077 1078 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1079 1080 return; 1081 } 1082 1083 module_init(acpi_processor_init); 1084 module_exit(acpi_processor_exit); 1085 1086 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1087 1088 MODULE_ALIAS("processor"); 1089