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 #include <linux/cpuidle.h> 48 49 #include <asm/io.h> 50 #include <asm/system.h> 51 #include <asm/cpu.h> 52 #include <asm/delay.h> 53 #include <asm/uaccess.h> 54 #include <asm/processor.h> 55 #include <asm/smp.h> 56 #include <asm/acpi.h> 57 58 #include <acpi/acpi_bus.h> 59 #include <acpi/acpi_drivers.h> 60 #include <acpi/processor.h> 61 62 #define ACPI_PROCESSOR_COMPONENT 0x01000000 63 #define ACPI_PROCESSOR_CLASS "processor" 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 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 71 72 #define ACPI_PROCESSOR_LIMIT_USER 0 73 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 74 75 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 76 ACPI_MODULE_NAME("processor_core"); 77 78 MODULE_AUTHOR("Paul Diefenbaugh"); 79 MODULE_DESCRIPTION("ACPI Processor Driver"); 80 MODULE_LICENSE("GPL"); 81 82 static int acpi_processor_add(struct acpi_device *device); 83 static int acpi_processor_start(struct acpi_device *device); 84 static int acpi_processor_remove(struct acpi_device *device, int type); 85 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 86 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 87 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 88 static int acpi_processor_handle_eject(struct acpi_processor *pr); 89 extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr); 90 91 92 static const struct acpi_device_id processor_device_ids[] = { 93 {ACPI_PROCESSOR_HID, 0}, 94 {"", 0}, 95 }; 96 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 97 98 static struct acpi_driver acpi_processor_driver = { 99 .name = "processor", 100 .class = ACPI_PROCESSOR_CLASS, 101 .ids = processor_device_ids, 102 .ops = { 103 .add = acpi_processor_add, 104 .remove = acpi_processor_remove, 105 .start = acpi_processor_start, 106 .suspend = acpi_processor_suspend, 107 .resume = acpi_processor_resume, 108 }, 109 }; 110 111 #define INSTALL_NOTIFY_HANDLER 1 112 #define UNINSTALL_NOTIFY_HANDLER 2 113 114 static const struct file_operations acpi_processor_info_fops = { 115 .owner = THIS_MODULE, 116 .open = acpi_processor_info_open_fs, 117 .read = seq_read, 118 .llseek = seq_lseek, 119 .release = single_release, 120 }; 121 122 struct acpi_processor *processors[NR_CPUS]; 123 struct acpi_processor_errata errata __read_mostly; 124 125 /* -------------------------------------------------------------------------- 126 Errata Handling 127 -------------------------------------------------------------------------- */ 128 129 static int acpi_processor_errata_piix4(struct pci_dev *dev) 130 { 131 u8 value1 = 0; 132 u8 value2 = 0; 133 134 135 if (!dev) 136 return -EINVAL; 137 138 /* 139 * Note that 'dev' references the PIIX4 ACPI Controller. 140 */ 141 142 switch (dev->revision) { 143 case 0: 144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 145 break; 146 case 1: 147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 148 break; 149 case 2: 150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 151 break; 152 case 3: 153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 154 break; 155 default: 156 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 157 break; 158 } 159 160 switch (dev->revision) { 161 162 case 0: /* PIIX4 A-step */ 163 case 1: /* PIIX4 B-step */ 164 /* 165 * See specification changes #13 ("Manual Throttle Duty Cycle") 166 * and #14 ("Enabling and Disabling Manual Throttle"), plus 167 * erratum #5 ("STPCLK# Deassertion Time") from the January 168 * 2002 PIIX4 specification update. Applies to only older 169 * PIIX4 models. 170 */ 171 errata.piix4.throttle = 1; 172 173 case 2: /* PIIX4E */ 174 case 3: /* PIIX4M */ 175 /* 176 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 177 * Livelock") from the January 2002 PIIX4 specification update. 178 * Applies to all PIIX4 models. 179 */ 180 181 /* 182 * BM-IDE 183 * ------ 184 * Find the PIIX4 IDE Controller and get the Bus Master IDE 185 * Status register address. We'll use this later to read 186 * each IDE controller's DMA status to make sure we catch all 187 * DMA activity. 188 */ 189 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 190 PCI_DEVICE_ID_INTEL_82371AB, 191 PCI_ANY_ID, PCI_ANY_ID, NULL); 192 if (dev) { 193 errata.piix4.bmisx = pci_resource_start(dev, 4); 194 pci_dev_put(dev); 195 } 196 197 /* 198 * Type-F DMA 199 * ---------- 200 * Find the PIIX4 ISA Controller and read the Motherboard 201 * DMA controller's status to see if Type-F (Fast) DMA mode 202 * is enabled (bit 7) on either channel. Note that we'll 203 * disable C3 support if this is enabled, as some legacy 204 * devices won't operate well if fast DMA is disabled. 205 */ 206 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 207 PCI_DEVICE_ID_INTEL_82371AB_0, 208 PCI_ANY_ID, PCI_ANY_ID, NULL); 209 if (dev) { 210 pci_read_config_byte(dev, 0x76, &value1); 211 pci_read_config_byte(dev, 0x77, &value2); 212 if ((value1 & 0x80) || (value2 & 0x80)) 213 errata.piix4.fdma = 1; 214 pci_dev_put(dev); 215 } 216 217 break; 218 } 219 220 if (errata.piix4.bmisx) 221 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 222 "Bus master activity detection (BM-IDE) erratum enabled\n")); 223 if (errata.piix4.fdma) 224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 225 "Type-F DMA livelock erratum (C3 disabled)\n")); 226 227 return 0; 228 } 229 230 static int acpi_processor_errata(struct acpi_processor *pr) 231 { 232 int result = 0; 233 struct pci_dev *dev = NULL; 234 235 236 if (!pr) 237 return -EINVAL; 238 239 /* 240 * PIIX4 241 */ 242 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 243 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 244 PCI_ANY_ID, NULL); 245 if (dev) { 246 result = acpi_processor_errata_piix4(dev); 247 pci_dev_put(dev); 248 } 249 250 return result; 251 } 252 253 /* -------------------------------------------------------------------------- 254 Common ACPI processor functions 255 -------------------------------------------------------------------------- */ 256 257 /* 258 * _PDC is required for a BIOS-OS handshake for most of the newer 259 * ACPI processor features. 260 */ 261 static int acpi_processor_set_pdc(struct acpi_processor *pr) 262 { 263 struct acpi_object_list *pdc_in = pr->pdc; 264 acpi_status status = AE_OK; 265 266 267 if (!pdc_in) 268 return status; 269 270 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 271 272 if (ACPI_FAILURE(status)) 273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 274 "Could not evaluate _PDC, using legacy perf. control...\n")); 275 276 return status; 277 } 278 279 /* -------------------------------------------------------------------------- 280 FS Interface (/proc) 281 -------------------------------------------------------------------------- */ 282 283 static struct proc_dir_entry *acpi_processor_dir = NULL; 284 285 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 286 { 287 struct acpi_processor *pr = seq->private; 288 289 290 if (!pr) 291 goto end; 292 293 seq_printf(seq, "processor id: %d\n" 294 "acpi id: %d\n" 295 "bus mastering control: %s\n" 296 "power management: %s\n" 297 "throttling control: %s\n" 298 "limit interface: %s\n", 299 pr->id, 300 pr->acpi_id, 301 pr->flags.bm_control ? "yes" : "no", 302 pr->flags.power ? "yes" : "no", 303 pr->flags.throttling ? "yes" : "no", 304 pr->flags.limit ? "yes" : "no"); 305 306 end: 307 return 0; 308 } 309 310 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 311 { 312 return single_open(file, acpi_processor_info_seq_show, 313 PDE(inode)->data); 314 } 315 316 static int acpi_processor_add_fs(struct acpi_device *device) 317 { 318 struct proc_dir_entry *entry = NULL; 319 320 321 if (!acpi_device_dir(device)) { 322 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 323 acpi_processor_dir); 324 if (!acpi_device_dir(device)) 325 return -ENODEV; 326 } 327 acpi_device_dir(device)->owner = THIS_MODULE; 328 329 /* 'info' [R] */ 330 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, 331 S_IRUGO, acpi_device_dir(device), 332 &acpi_processor_info_fops, 333 acpi_driver_data(device)); 334 if (!entry) 335 return -EIO; 336 337 /* 'throttling' [R/W] */ 338 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, 339 S_IFREG | S_IRUGO | S_IWUSR, 340 acpi_device_dir(device), 341 &acpi_processor_throttling_fops, 342 acpi_driver_data(device)); 343 if (!entry) 344 return -EIO; 345 346 /* 'limit' [R/W] */ 347 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, 348 S_IFREG | S_IRUGO | S_IWUSR, 349 acpi_device_dir(device), 350 &acpi_processor_limit_fops, 351 acpi_driver_data(device)); 352 if (!entry) 353 return -EIO; 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 static int map_madt_entry(u32 acpi_id) 417 { 418 unsigned long madt_end, entry; 419 int apic_id = -1; 420 421 if (!madt) 422 return apic_id; 423 424 entry = (unsigned long)madt; 425 madt_end = entry + madt->header.length; 426 427 /* Parse all entries looking for a match. */ 428 429 entry += sizeof(struct acpi_table_madt); 430 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 431 struct acpi_subtable_header *header = 432 (struct acpi_subtable_header *)entry; 433 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 434 if (map_lapic_id(header, acpi_id, &apic_id)) 435 break; 436 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 437 if (map_lsapic_id(header, acpi_id, &apic_id)) 438 break; 439 } 440 entry += header->length; 441 } 442 return apic_id; 443 } 444 445 static int map_mat_entry(acpi_handle handle, u32 acpi_id) 446 { 447 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 448 union acpi_object *obj; 449 struct acpi_subtable_header *header; 450 int apic_id = -1; 451 452 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 453 goto exit; 454 455 if (!buffer.length || !buffer.pointer) 456 goto exit; 457 458 obj = buffer.pointer; 459 if (obj->type != ACPI_TYPE_BUFFER || 460 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 461 goto exit; 462 } 463 464 header = (struct acpi_subtable_header *)obj->buffer.pointer; 465 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 466 map_lapic_id(header, acpi_id, &apic_id); 467 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 468 map_lsapic_id(header, acpi_id, &apic_id); 469 } 470 471 exit: 472 if (buffer.pointer) 473 kfree(buffer.pointer); 474 return apic_id; 475 } 476 477 static int get_cpu_id(acpi_handle handle, u32 acpi_id) 478 { 479 int i; 480 int apic_id = -1; 481 482 apic_id = map_mat_entry(handle, acpi_id); 483 if (apic_id == -1) 484 apic_id = map_madt_entry(acpi_id); 485 if (apic_id == -1) 486 return apic_id; 487 488 for_each_possible_cpu(i) { 489 if (cpu_physical_id(i) == apic_id) 490 return i; 491 } 492 return -1; 493 } 494 #endif 495 496 /* -------------------------------------------------------------------------- 497 Driver Interface 498 -------------------------------------------------------------------------- */ 499 500 static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid) 501 { 502 acpi_status status = 0; 503 union acpi_object object = { 0 }; 504 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 505 int cpu_index; 506 static int cpu0_initialized; 507 508 509 if (!pr) 510 return -EINVAL; 511 512 if (num_online_cpus() > 1) 513 errata.smp = TRUE; 514 515 acpi_processor_errata(pr); 516 517 /* 518 * Check to see if we have bus mastering arbitration control. This 519 * is required for proper C3 usage (to maintain cache coherency). 520 */ 521 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 522 pr->flags.bm_control = 1; 523 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 524 "Bus mastering arbitration control present\n")); 525 } else 526 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 527 "No bus mastering arbitration control\n")); 528 529 /* Check if it is a Device with HID and UID */ 530 if (has_uid) { 531 unsigned long value; 532 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 533 NULL, &value); 534 if (ACPI_FAILURE(status)) { 535 printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); 536 return -ENODEV; 537 } 538 pr->acpi_id = value; 539 } else { 540 /* 541 * Evalute the processor object. Note that it is common on SMP to 542 * have the first (boot) processor with a valid PBLK address while 543 * all others have a NULL address. 544 */ 545 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 546 if (ACPI_FAILURE(status)) { 547 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 548 return -ENODEV; 549 } 550 551 /* 552 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 553 * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c 554 */ 555 pr->acpi_id = object.processor.proc_id; 556 } 557 cpu_index = get_cpu_id(pr->handle, pr->acpi_id); 558 559 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 560 if (!cpu0_initialized && (cpu_index == -1) && 561 (num_online_cpus() == 1)) { 562 cpu_index = 0; 563 } 564 565 cpu0_initialized = 1; 566 567 pr->id = cpu_index; 568 569 /* 570 * Extra Processor objects may be enumerated on MP systems with 571 * less than the max # of CPUs. They should be ignored _iff 572 * they are physically not present. 573 */ 574 if (pr->id == -1) { 575 if (ACPI_FAILURE 576 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 577 return -ENODEV; 578 } 579 } 580 581 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 582 pr->acpi_id)); 583 584 if (!object.processor.pblk_address) 585 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 586 else if (object.processor.pblk_length != 6) 587 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 588 object.processor.pblk_length); 589 else { 590 pr->throttling.address = object.processor.pblk_address; 591 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 592 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 593 594 pr->pblk = object.processor.pblk_address; 595 596 /* 597 * We don't care about error returns - we just try to mark 598 * these reserved so that nobody else is confused into thinking 599 * that this region might be unused.. 600 * 601 * (In particular, allocating the IO range for Cardbus) 602 */ 603 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 604 } 605 606 /* 607 * If ACPI describes a slot number for this CPU, we can use it 608 * ensure we get the right value in the "physical id" field 609 * of /proc/cpuinfo 610 */ 611 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 612 if (ACPI_SUCCESS(status)) 613 arch_fix_phys_package_id(pr->id, object.integer.value); 614 615 return 0; 616 } 617 618 static void *processor_device_array[NR_CPUS]; 619 620 static int __cpuinit acpi_processor_start(struct acpi_device *device) 621 { 622 int result = 0; 623 acpi_status status = AE_OK; 624 struct acpi_processor *pr; 625 626 627 pr = acpi_driver_data(device); 628 629 result = acpi_processor_get_info(pr, device->flags.unique_id); 630 if (result) { 631 /* Processor is physically not present */ 632 return 0; 633 } 634 635 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 636 637 /* 638 * Buggy BIOS check 639 * ACPI id of processors can be reported wrongly by the BIOS. 640 * Don't trust it blindly 641 */ 642 if (processor_device_array[pr->id] != NULL && 643 processor_device_array[pr->id] != device) { 644 printk(KERN_WARNING "BIOS reported wrong ACPI id " 645 "for the processor\n"); 646 return -ENODEV; 647 } 648 processor_device_array[pr->id] = device; 649 650 processors[pr->id] = pr; 651 652 result = acpi_processor_add_fs(device); 653 if (result) 654 goto end; 655 656 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 657 acpi_processor_notify, pr); 658 659 /* _PDC call should be done before doing anything else (if reqd.). */ 660 arch_acpi_processor_init_pdc(pr); 661 acpi_processor_set_pdc(pr); 662 #ifdef CONFIG_CPU_FREQ 663 acpi_processor_ppc_has_changed(pr); 664 #endif 665 acpi_processor_get_throttling_info(pr); 666 acpi_processor_get_limit_info(pr); 667 668 669 acpi_processor_power_init(pr, device); 670 671 pr->cdev = thermal_cooling_device_register("Processor", device, 672 &processor_cooling_ops); 673 if (IS_ERR(pr->cdev)) { 674 result = PTR_ERR(pr->cdev); 675 goto end; 676 } 677 if (pr->cdev) { 678 printk(KERN_INFO PREFIX 679 "%s is registered as cooling_device%d\n", 680 device->dev.bus_id, pr->cdev->id); 681 682 result = sysfs_create_link(&device->dev.kobj, 683 &pr->cdev->device.kobj, 684 "thermal_cooling"); 685 if (result) 686 return result; 687 result = sysfs_create_link(&pr->cdev->device.kobj, 688 &device->dev.kobj, 689 "device"); 690 if (result) 691 return result; 692 } 693 694 if (pr->flags.throttling) { 695 printk(KERN_INFO PREFIX "%s [%s] (supports", 696 acpi_device_name(device), acpi_device_bid(device)); 697 printk(" %d throttling states", pr->throttling.state_count); 698 printk(")\n"); 699 } 700 701 end: 702 703 return result; 704 } 705 706 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 707 { 708 struct acpi_processor *pr = data; 709 struct acpi_device *device = NULL; 710 int saved; 711 712 if (!pr) 713 return; 714 715 if (acpi_bus_get_device(pr->handle, &device)) 716 return; 717 718 switch (event) { 719 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 720 saved = pr->performance_platform_limit; 721 acpi_processor_ppc_has_changed(pr); 722 if (saved == pr->performance_platform_limit) 723 break; 724 acpi_bus_generate_proc_event(device, event, 725 pr->performance_platform_limit); 726 acpi_bus_generate_netlink_event(device->pnp.device_class, 727 device->dev.bus_id, event, 728 pr->performance_platform_limit); 729 break; 730 case ACPI_PROCESSOR_NOTIFY_POWER: 731 acpi_processor_cst_has_changed(pr); 732 acpi_bus_generate_proc_event(device, event, 0); 733 acpi_bus_generate_netlink_event(device->pnp.device_class, 734 device->dev.bus_id, event, 0); 735 break; 736 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 737 acpi_processor_tstate_has_changed(pr); 738 acpi_bus_generate_proc_event(device, event, 0); 739 acpi_bus_generate_netlink_event(device->pnp.device_class, 740 device->dev.bus_id, event, 0); 741 default: 742 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 743 "Unsupported event [0x%x]\n", event)); 744 break; 745 } 746 747 return; 748 } 749 750 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 751 unsigned long action, void *hcpu) 752 { 753 unsigned int cpu = (unsigned long)hcpu; 754 struct acpi_processor *pr = processors[cpu]; 755 756 if (action == CPU_ONLINE && pr) { 757 acpi_processor_ppc_has_changed(pr); 758 acpi_processor_cst_has_changed(pr); 759 acpi_processor_tstate_has_changed(pr); 760 } 761 return NOTIFY_OK; 762 } 763 764 static struct notifier_block acpi_cpu_notifier = 765 { 766 .notifier_call = acpi_cpu_soft_notify, 767 }; 768 769 static int acpi_processor_add(struct acpi_device *device) 770 { 771 struct acpi_processor *pr = NULL; 772 773 774 if (!device) 775 return -EINVAL; 776 777 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 778 if (!pr) 779 return -ENOMEM; 780 781 pr->handle = device->handle; 782 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 783 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 784 acpi_driver_data(device) = pr; 785 786 return 0; 787 } 788 789 static int acpi_processor_remove(struct acpi_device *device, int type) 790 { 791 acpi_status status = AE_OK; 792 struct acpi_processor *pr = NULL; 793 794 795 if (!device || !acpi_driver_data(device)) 796 return -EINVAL; 797 798 pr = acpi_driver_data(device); 799 800 if (pr->id >= nr_cpu_ids) { 801 kfree(pr); 802 return 0; 803 } 804 805 if (type == ACPI_BUS_REMOVAL_EJECT) { 806 if (acpi_processor_handle_eject(pr)) 807 return -EINVAL; 808 } 809 810 acpi_processor_power_exit(pr, device); 811 812 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 813 acpi_processor_notify); 814 815 acpi_processor_remove_fs(device); 816 817 if (pr->cdev) { 818 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 819 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 820 thermal_cooling_device_unregister(pr->cdev); 821 pr->cdev = NULL; 822 } 823 824 processors[pr->id] = NULL; 825 processor_device_array[pr->id] = NULL; 826 kfree(pr); 827 828 return 0; 829 } 830 831 #ifdef CONFIG_ACPI_HOTPLUG_CPU 832 /**************************************************************************** 833 * Acpi processor hotplug support * 834 ****************************************************************************/ 835 836 static int is_processor_present(acpi_handle handle) 837 { 838 acpi_status status; 839 unsigned long sta = 0; 840 841 842 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 843 844 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 845 return 1; 846 847 /* 848 * _STA is mandatory for a processor that supports hot plug 849 */ 850 if (status == AE_NOT_FOUND) 851 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 852 "Processor does not support hot plug\n")); 853 else 854 ACPI_EXCEPTION((AE_INFO, status, 855 "Processor Device is not present")); 856 return 0; 857 } 858 859 static 860 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 861 { 862 acpi_handle phandle; 863 struct acpi_device *pdev; 864 struct acpi_processor *pr; 865 866 867 if (acpi_get_parent(handle, &phandle)) { 868 return -ENODEV; 869 } 870 871 if (acpi_bus_get_device(phandle, &pdev)) { 872 return -ENODEV; 873 } 874 875 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 876 return -ENODEV; 877 } 878 879 acpi_bus_start(*device); 880 881 pr = acpi_driver_data(*device); 882 if (!pr) 883 return -ENODEV; 884 885 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { 886 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 887 } 888 return 0; 889 } 890 891 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 892 u32 event, void *data) 893 { 894 struct acpi_processor *pr; 895 struct acpi_device *device = NULL; 896 int result; 897 898 899 switch (event) { 900 case ACPI_NOTIFY_BUS_CHECK: 901 case ACPI_NOTIFY_DEVICE_CHECK: 902 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 903 "Processor driver received %s event\n", 904 (event == ACPI_NOTIFY_BUS_CHECK) ? 905 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 906 907 if (!is_processor_present(handle)) 908 break; 909 910 if (acpi_bus_get_device(handle, &device)) { 911 result = acpi_processor_device_add(handle, &device); 912 if (result) 913 printk(KERN_ERR PREFIX 914 "Unable to add the device\n"); 915 break; 916 } 917 918 pr = acpi_driver_data(device); 919 if (!pr) { 920 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 921 break; 922 } 923 924 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { 925 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 926 break; 927 } 928 929 result = acpi_processor_start(device); 930 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { 931 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 932 } else { 933 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 934 acpi_device_bid(device)); 935 } 936 break; 937 case ACPI_NOTIFY_EJECT_REQUEST: 938 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 939 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 940 941 if (acpi_bus_get_device(handle, &device)) { 942 printk(KERN_ERR PREFIX 943 "Device don't exist, dropping EJECT\n"); 944 break; 945 } 946 pr = acpi_driver_data(device); 947 if (!pr) { 948 printk(KERN_ERR PREFIX 949 "Driver data is NULL, dropping EJECT\n"); 950 return; 951 } 952 953 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) 954 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 955 break; 956 default: 957 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 958 "Unsupported event [0x%x]\n", event)); 959 break; 960 } 961 962 return; 963 } 964 965 static acpi_status 966 processor_walk_namespace_cb(acpi_handle handle, 967 u32 lvl, void *context, void **rv) 968 { 969 acpi_status status; 970 int *action = context; 971 acpi_object_type type = 0; 972 973 status = acpi_get_type(handle, &type); 974 if (ACPI_FAILURE(status)) 975 return (AE_OK); 976 977 if (type != ACPI_TYPE_PROCESSOR) 978 return (AE_OK); 979 980 switch (*action) { 981 case INSTALL_NOTIFY_HANDLER: 982 acpi_install_notify_handler(handle, 983 ACPI_SYSTEM_NOTIFY, 984 acpi_processor_hotplug_notify, 985 NULL); 986 break; 987 case UNINSTALL_NOTIFY_HANDLER: 988 acpi_remove_notify_handler(handle, 989 ACPI_SYSTEM_NOTIFY, 990 acpi_processor_hotplug_notify); 991 break; 992 default: 993 break; 994 } 995 996 return (AE_OK); 997 } 998 999 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1000 { 1001 1002 if (!is_processor_present(handle)) { 1003 return AE_ERROR; 1004 } 1005 1006 if (acpi_map_lsapic(handle, p_cpu)) 1007 return AE_ERROR; 1008 1009 if (arch_register_cpu(*p_cpu)) { 1010 acpi_unmap_lsapic(*p_cpu); 1011 return AE_ERROR; 1012 } 1013 1014 return AE_OK; 1015 } 1016 1017 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1018 { 1019 if (cpu_online(pr->id)) { 1020 return (-EINVAL); 1021 } 1022 arch_unregister_cpu(pr->id); 1023 acpi_unmap_lsapic(pr->id); 1024 return (0); 1025 } 1026 #else 1027 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1028 { 1029 return AE_ERROR; 1030 } 1031 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1032 { 1033 return (-EINVAL); 1034 } 1035 #endif 1036 1037 static 1038 void acpi_processor_install_hotplug_notify(void) 1039 { 1040 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1041 int action = INSTALL_NOTIFY_HANDLER; 1042 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1043 ACPI_ROOT_OBJECT, 1044 ACPI_UINT32_MAX, 1045 processor_walk_namespace_cb, &action, NULL); 1046 #endif 1047 register_hotcpu_notifier(&acpi_cpu_notifier); 1048 } 1049 1050 static 1051 void acpi_processor_uninstall_hotplug_notify(void) 1052 { 1053 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1054 int action = UNINSTALL_NOTIFY_HANDLER; 1055 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1056 ACPI_ROOT_OBJECT, 1057 ACPI_UINT32_MAX, 1058 processor_walk_namespace_cb, &action, NULL); 1059 #endif 1060 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1061 } 1062 1063 /* 1064 * We keep the driver loaded even when ACPI is not running. 1065 * This is needed for the powernow-k8 driver, that works even without 1066 * ACPI, but needs symbols from this driver 1067 */ 1068 1069 static int __init acpi_processor_init(void) 1070 { 1071 int result = 0; 1072 1073 1074 memset(&processors, 0, sizeof(processors)); 1075 memset(&errata, 0, sizeof(errata)); 1076 1077 #ifdef CONFIG_SMP 1078 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1079 (struct acpi_table_header **)&madt))) 1080 madt = NULL; 1081 #endif 1082 1083 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1084 if (!acpi_processor_dir) 1085 return -ENOMEM; 1086 acpi_processor_dir->owner = THIS_MODULE; 1087 1088 result = cpuidle_register_driver(&acpi_idle_driver); 1089 if (result < 0) 1090 goto out_proc; 1091 1092 result = acpi_bus_register_driver(&acpi_processor_driver); 1093 if (result < 0) 1094 goto out_cpuidle; 1095 1096 acpi_processor_install_hotplug_notify(); 1097 1098 acpi_thermal_cpufreq_init(); 1099 1100 acpi_processor_ppc_init(); 1101 1102 acpi_processor_throttling_init(); 1103 1104 return 0; 1105 1106 out_cpuidle: 1107 cpuidle_unregister_driver(&acpi_idle_driver); 1108 1109 out_proc: 1110 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1111 1112 return result; 1113 } 1114 1115 static void __exit acpi_processor_exit(void) 1116 { 1117 acpi_processor_ppc_exit(); 1118 1119 acpi_thermal_cpufreq_exit(); 1120 1121 acpi_processor_uninstall_hotplug_notify(); 1122 1123 acpi_bus_unregister_driver(&acpi_processor_driver); 1124 1125 cpuidle_unregister_driver(&acpi_idle_driver); 1126 1127 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1128 1129 return; 1130 } 1131 1132 module_init(acpi_processor_init); 1133 module_exit(acpi_processor_exit); 1134 1135 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1136 1137 MODULE_ALIAS("processor"); 1138