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 PREFIX "ACPI: " 63 64 #define ACPI_PROCESSOR_CLASS "processor" 65 #define ACPI_PROCESSOR_DEVICE_NAME "Processor" 66 #define ACPI_PROCESSOR_FILE_INFO "info" 67 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 68 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 70 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 72 73 #define ACPI_PROCESSOR_LIMIT_USER 0 74 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 75 76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 77 ACPI_MODULE_NAME("processor_core"); 78 79 MODULE_AUTHOR("Paul Diefenbaugh"); 80 MODULE_DESCRIPTION("ACPI Processor Driver"); 81 MODULE_LICENSE("GPL"); 82 83 static int acpi_processor_add(struct acpi_device *device); 84 static int acpi_processor_remove(struct acpi_device *device, int type); 85 #ifdef CONFIG_ACPI_PROCFS 86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 87 #endif 88 static void acpi_processor_notify(struct acpi_device *device, u32 event); 89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 90 static int acpi_processor_handle_eject(struct acpi_processor *pr); 91 92 93 static const struct acpi_device_id processor_device_ids[] = { 94 {ACPI_PROCESSOR_OBJECT_HID, 0}, 95 {"ACPI0007", 0}, 96 {"", 0}, 97 }; 98 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 99 100 static struct acpi_driver acpi_processor_driver = { 101 .name = "processor", 102 .class = ACPI_PROCESSOR_CLASS, 103 .ids = processor_device_ids, 104 .ops = { 105 .add = acpi_processor_add, 106 .remove = acpi_processor_remove, 107 .suspend = acpi_processor_suspend, 108 .resume = acpi_processor_resume, 109 .notify = acpi_processor_notify, 110 }, 111 }; 112 113 #define INSTALL_NOTIFY_HANDLER 1 114 #define UNINSTALL_NOTIFY_HANDLER 2 115 #ifdef CONFIG_ACPI_PROCFS 116 static const struct file_operations acpi_processor_info_fops = { 117 .owner = THIS_MODULE, 118 .open = acpi_processor_info_open_fs, 119 .read = seq_read, 120 .llseek = seq_lseek, 121 .release = single_release, 122 }; 123 #endif 124 125 DEFINE_PER_CPU(struct acpi_processor *, processors); 126 struct acpi_processor_errata errata __read_mostly; 127 static int set_no_mwait(const struct dmi_system_id *id) 128 { 129 printk(KERN_NOTICE PREFIX "%s detected - " 130 "disabling mwait for CPU C-states\n", id->ident); 131 idle_nomwait = 1; 132 return 0; 133 } 134 135 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { 136 { 137 set_no_mwait, "IFL91 board", { 138 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), 139 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"), 140 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"), 141 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL}, 142 { 143 set_no_mwait, "Extensa 5220", { 144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 145 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 146 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), 147 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, 148 {}, 149 }; 150 151 /* -------------------------------------------------------------------------- 152 Errata Handling 153 -------------------------------------------------------------------------- */ 154 155 static int acpi_processor_errata_piix4(struct pci_dev *dev) 156 { 157 u8 value1 = 0; 158 u8 value2 = 0; 159 160 161 if (!dev) 162 return -EINVAL; 163 164 /* 165 * Note that 'dev' references the PIIX4 ACPI Controller. 166 */ 167 168 switch (dev->revision) { 169 case 0: 170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 171 break; 172 case 1: 173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 174 break; 175 case 2: 176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 177 break; 178 case 3: 179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 180 break; 181 default: 182 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 183 break; 184 } 185 186 switch (dev->revision) { 187 188 case 0: /* PIIX4 A-step */ 189 case 1: /* PIIX4 B-step */ 190 /* 191 * See specification changes #13 ("Manual Throttle Duty Cycle") 192 * and #14 ("Enabling and Disabling Manual Throttle"), plus 193 * erratum #5 ("STPCLK# Deassertion Time") from the January 194 * 2002 PIIX4 specification update. Applies to only older 195 * PIIX4 models. 196 */ 197 errata.piix4.throttle = 1; 198 199 case 2: /* PIIX4E */ 200 case 3: /* PIIX4M */ 201 /* 202 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 203 * Livelock") from the January 2002 PIIX4 specification update. 204 * Applies to all PIIX4 models. 205 */ 206 207 /* 208 * BM-IDE 209 * ------ 210 * Find the PIIX4 IDE Controller and get the Bus Master IDE 211 * Status register address. We'll use this later to read 212 * each IDE controller's DMA status to make sure we catch all 213 * DMA activity. 214 */ 215 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 216 PCI_DEVICE_ID_INTEL_82371AB, 217 PCI_ANY_ID, PCI_ANY_ID, NULL); 218 if (dev) { 219 errata.piix4.bmisx = pci_resource_start(dev, 4); 220 pci_dev_put(dev); 221 } 222 223 /* 224 * Type-F DMA 225 * ---------- 226 * Find the PIIX4 ISA Controller and read the Motherboard 227 * DMA controller's status to see if Type-F (Fast) DMA mode 228 * is enabled (bit 7) on either channel. Note that we'll 229 * disable C3 support if this is enabled, as some legacy 230 * devices won't operate well if fast DMA is disabled. 231 */ 232 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 233 PCI_DEVICE_ID_INTEL_82371AB_0, 234 PCI_ANY_ID, PCI_ANY_ID, NULL); 235 if (dev) { 236 pci_read_config_byte(dev, 0x76, &value1); 237 pci_read_config_byte(dev, 0x77, &value2); 238 if ((value1 & 0x80) || (value2 & 0x80)) 239 errata.piix4.fdma = 1; 240 pci_dev_put(dev); 241 } 242 243 break; 244 } 245 246 if (errata.piix4.bmisx) 247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 248 "Bus master activity detection (BM-IDE) erratum enabled\n")); 249 if (errata.piix4.fdma) 250 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 251 "Type-F DMA livelock erratum (C3 disabled)\n")); 252 253 return 0; 254 } 255 256 static int acpi_processor_errata(struct acpi_processor *pr) 257 { 258 int result = 0; 259 struct pci_dev *dev = NULL; 260 261 262 if (!pr) 263 return -EINVAL; 264 265 /* 266 * PIIX4 267 */ 268 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 269 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 270 PCI_ANY_ID, NULL); 271 if (dev) { 272 result = acpi_processor_errata_piix4(dev); 273 pci_dev_put(dev); 274 } 275 276 return result; 277 } 278 279 /* -------------------------------------------------------------------------- 280 Common ACPI processor functions 281 -------------------------------------------------------------------------- */ 282 283 /* 284 * _PDC is required for a BIOS-OS handshake for most of the newer 285 * ACPI processor features. 286 */ 287 static int acpi_processor_set_pdc(struct acpi_processor *pr) 288 { 289 struct acpi_object_list *pdc_in = pr->pdc; 290 acpi_status status = AE_OK; 291 292 293 if (!pdc_in) 294 return status; 295 if (idle_nomwait) { 296 /* 297 * If mwait is disabled for CPU C-states, the C2C3_FFH access 298 * mode will be disabled in the parameter of _PDC object. 299 * Of course C1_FFH access mode will also be disabled. 300 */ 301 union acpi_object *obj; 302 u32 *buffer = NULL; 303 304 obj = pdc_in->pointer; 305 buffer = (u32 *)(obj->buffer.pointer); 306 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); 307 308 } 309 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); 310 311 if (ACPI_FAILURE(status)) 312 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 313 "Could not evaluate _PDC, using legacy perf. control...\n")); 314 315 return status; 316 } 317 318 /* -------------------------------------------------------------------------- 319 FS Interface (/proc) 320 -------------------------------------------------------------------------- */ 321 322 #ifdef CONFIG_ACPI_PROCFS 323 static struct proc_dir_entry *acpi_processor_dir = NULL; 324 325 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 326 { 327 struct acpi_processor *pr = seq->private; 328 329 330 if (!pr) 331 goto end; 332 333 seq_printf(seq, "processor id: %d\n" 334 "acpi id: %d\n" 335 "bus mastering control: %s\n" 336 "power management: %s\n" 337 "throttling control: %s\n" 338 "limit interface: %s\n", 339 pr->id, 340 pr->acpi_id, 341 pr->flags.bm_control ? "yes" : "no", 342 pr->flags.power ? "yes" : "no", 343 pr->flags.throttling ? "yes" : "no", 344 pr->flags.limit ? "yes" : "no"); 345 346 end: 347 return 0; 348 } 349 350 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 351 { 352 return single_open(file, acpi_processor_info_seq_show, 353 PDE(inode)->data); 354 } 355 356 static int acpi_processor_add_fs(struct acpi_device *device) 357 { 358 struct proc_dir_entry *entry = NULL; 359 360 361 if (!acpi_device_dir(device)) { 362 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 363 acpi_processor_dir); 364 if (!acpi_device_dir(device)) 365 return -ENODEV; 366 } 367 368 /* 'info' [R] */ 369 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, 370 S_IRUGO, acpi_device_dir(device), 371 &acpi_processor_info_fops, 372 acpi_driver_data(device)); 373 if (!entry) 374 return -EIO; 375 376 /* 'throttling' [R/W] */ 377 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, 378 S_IFREG | S_IRUGO | S_IWUSR, 379 acpi_device_dir(device), 380 &acpi_processor_throttling_fops, 381 acpi_driver_data(device)); 382 if (!entry) 383 return -EIO; 384 385 /* 'limit' [R/W] */ 386 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, 387 S_IFREG | S_IRUGO | S_IWUSR, 388 acpi_device_dir(device), 389 &acpi_processor_limit_fops, 390 acpi_driver_data(device)); 391 if (!entry) 392 return -EIO; 393 return 0; 394 } 395 static int acpi_processor_remove_fs(struct acpi_device *device) 396 { 397 398 if (acpi_device_dir(device)) { 399 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 400 acpi_device_dir(device)); 401 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 402 acpi_device_dir(device)); 403 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 404 acpi_device_dir(device)); 405 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 406 acpi_device_dir(device) = NULL; 407 } 408 409 return 0; 410 } 411 #else 412 static inline int acpi_processor_add_fs(struct acpi_device *device) 413 { 414 return 0; 415 } 416 static inline int acpi_processor_remove_fs(struct acpi_device *device) 417 { 418 return 0; 419 } 420 #endif 421 422 /* Use the acpiid in MADT to map cpus in case of SMP */ 423 424 #ifndef CONFIG_SMP 425 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } 426 #else 427 428 static struct acpi_table_madt *madt; 429 430 static int map_lapic_id(struct acpi_subtable_header *entry, 431 u32 acpi_id, int *apic_id) 432 { 433 struct acpi_madt_local_apic *lapic = 434 (struct acpi_madt_local_apic *)entry; 435 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 436 lapic->processor_id == acpi_id) { 437 *apic_id = lapic->id; 438 return 1; 439 } 440 return 0; 441 } 442 443 static int map_x2apic_id(struct acpi_subtable_header *entry, 444 int device_declaration, u32 acpi_id, int *apic_id) 445 { 446 struct acpi_madt_local_x2apic *apic = 447 (struct acpi_madt_local_x2apic *)entry; 448 u32 tmp = apic->local_apic_id; 449 450 /* Only check enabled APICs*/ 451 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 452 return 0; 453 454 /* Device statement declaration type */ 455 if (device_declaration) { 456 if (apic->uid == acpi_id) 457 goto found; 458 } 459 460 return 0; 461 found: 462 *apic_id = tmp; 463 return 1; 464 } 465 466 static int map_lsapic_id(struct acpi_subtable_header *entry, 467 int device_declaration, u32 acpi_id, int *apic_id) 468 { 469 struct acpi_madt_local_sapic *lsapic = 470 (struct acpi_madt_local_sapic *)entry; 471 u32 tmp = (lsapic->id << 8) | lsapic->eid; 472 473 /* Only check enabled APICs*/ 474 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 475 return 0; 476 477 /* Device statement declaration type */ 478 if (device_declaration) { 479 if (entry->length < 16) 480 printk(KERN_ERR PREFIX 481 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", 482 tmp); 483 else if (lsapic->uid == acpi_id) 484 goto found; 485 /* Processor statement declaration type */ 486 } else if (lsapic->processor_id == acpi_id) 487 goto found; 488 489 return 0; 490 found: 491 *apic_id = tmp; 492 return 1; 493 } 494 495 static int map_madt_entry(int type, u32 acpi_id) 496 { 497 unsigned long madt_end, entry; 498 int apic_id = -1; 499 500 if (!madt) 501 return apic_id; 502 503 entry = (unsigned long)madt; 504 madt_end = entry + madt->header.length; 505 506 /* Parse all entries looking for a match. */ 507 508 entry += sizeof(struct acpi_table_madt); 509 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 510 struct acpi_subtable_header *header = 511 (struct acpi_subtable_header *)entry; 512 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 513 if (map_lapic_id(header, acpi_id, &apic_id)) 514 break; 515 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 516 if (map_x2apic_id(header, type, acpi_id, &apic_id)) 517 break; 518 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 519 if (map_lsapic_id(header, type, acpi_id, &apic_id)) 520 break; 521 } 522 entry += header->length; 523 } 524 return apic_id; 525 } 526 527 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 528 { 529 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 530 union acpi_object *obj; 531 struct acpi_subtable_header *header; 532 int apic_id = -1; 533 534 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 535 goto exit; 536 537 if (!buffer.length || !buffer.pointer) 538 goto exit; 539 540 obj = buffer.pointer; 541 if (obj->type != ACPI_TYPE_BUFFER || 542 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 543 goto exit; 544 } 545 546 header = (struct acpi_subtable_header *)obj->buffer.pointer; 547 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 548 map_lapic_id(header, acpi_id, &apic_id); 549 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 550 map_lsapic_id(header, type, acpi_id, &apic_id); 551 } 552 553 exit: 554 if (buffer.pointer) 555 kfree(buffer.pointer); 556 return apic_id; 557 } 558 559 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) 560 { 561 int i; 562 int apic_id = -1; 563 564 apic_id = map_mat_entry(handle, type, acpi_id); 565 if (apic_id == -1) 566 apic_id = map_madt_entry(type, acpi_id); 567 if (apic_id == -1) 568 return apic_id; 569 570 for_each_possible_cpu(i) { 571 if (cpu_physical_id(i) == apic_id) 572 return i; 573 } 574 return -1; 575 } 576 #endif 577 578 /* -------------------------------------------------------------------------- 579 Driver Interface 580 -------------------------------------------------------------------------- */ 581 582 static int acpi_processor_get_info(struct acpi_device *device) 583 { 584 acpi_status status = 0; 585 union acpi_object object = { 0 }; 586 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 587 struct acpi_processor *pr; 588 int cpu_index, device_declaration = 0; 589 static int cpu0_initialized; 590 591 pr = acpi_driver_data(device); 592 if (!pr) 593 return -EINVAL; 594 595 if (num_online_cpus() > 1) 596 errata.smp = TRUE; 597 598 acpi_processor_errata(pr); 599 600 /* 601 * Check to see if we have bus mastering arbitration control. This 602 * is required for proper C3 usage (to maintain cache coherency). 603 */ 604 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 605 pr->flags.bm_control = 1; 606 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 607 "Bus mastering arbitration control present\n")); 608 } else 609 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 610 "No bus mastering arbitration control\n")); 611 612 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 613 /* Declared with "Processor" statement; match ProcessorID */ 614 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 615 if (ACPI_FAILURE(status)) { 616 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 617 return -ENODEV; 618 } 619 620 /* 621 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 622 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 623 * arch/xxx/acpi.c 624 */ 625 pr->acpi_id = object.processor.proc_id; 626 } else { 627 /* 628 * Declared with "Device" statement; match _UID. 629 * Note that we don't handle string _UIDs yet. 630 */ 631 unsigned long long value; 632 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 633 NULL, &value); 634 if (ACPI_FAILURE(status)) { 635 printk(KERN_ERR PREFIX 636 "Evaluating processor _UID [%#x]\n", status); 637 return -ENODEV; 638 } 639 device_declaration = 1; 640 pr->acpi_id = value; 641 } 642 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); 643 644 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 645 if (!cpu0_initialized && (cpu_index == -1) && 646 (num_online_cpus() == 1)) { 647 cpu_index = 0; 648 } 649 650 cpu0_initialized = 1; 651 652 pr->id = cpu_index; 653 654 /* 655 * Extra Processor objects may be enumerated on MP systems with 656 * less than the max # of CPUs. They should be ignored _iff 657 * they are physically not present. 658 */ 659 if (pr->id == -1) { 660 if (ACPI_FAILURE 661 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 662 return -ENODEV; 663 } 664 } 665 /* 666 * On some boxes several processors use the same processor bus id. 667 * But they are located in different scope. For example: 668 * \_SB.SCK0.CPU0 669 * \_SB.SCK1.CPU0 670 * Rename the processor device bus id. And the new bus id will be 671 * generated as the following format: 672 * CPU+CPU ID. 673 */ 674 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 675 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 676 pr->acpi_id)); 677 678 if (!object.processor.pblk_address) 679 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 680 else if (object.processor.pblk_length != 6) 681 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 682 object.processor.pblk_length); 683 else { 684 pr->throttling.address = object.processor.pblk_address; 685 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 686 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 687 688 pr->pblk = object.processor.pblk_address; 689 690 /* 691 * We don't care about error returns - we just try to mark 692 * these reserved so that nobody else is confused into thinking 693 * that this region might be unused.. 694 * 695 * (In particular, allocating the IO range for Cardbus) 696 */ 697 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 698 } 699 700 /* 701 * If ACPI describes a slot number for this CPU, we can use it 702 * ensure we get the right value in the "physical id" field 703 * of /proc/cpuinfo 704 */ 705 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 706 if (ACPI_SUCCESS(status)) 707 arch_fix_phys_package_id(pr->id, object.integer.value); 708 709 return 0; 710 } 711 712 static DEFINE_PER_CPU(void *, processor_device_array); 713 714 static void acpi_processor_notify(struct acpi_device *device, u32 event) 715 { 716 struct acpi_processor *pr = acpi_driver_data(device); 717 int saved; 718 719 if (!pr) 720 return; 721 722 switch (event) { 723 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 724 saved = pr->performance_platform_limit; 725 acpi_processor_ppc_has_changed(pr); 726 if (saved == pr->performance_platform_limit) 727 break; 728 acpi_bus_generate_proc_event(device, event, 729 pr->performance_platform_limit); 730 acpi_bus_generate_netlink_event(device->pnp.device_class, 731 dev_name(&device->dev), event, 732 pr->performance_platform_limit); 733 break; 734 case ACPI_PROCESSOR_NOTIFY_POWER: 735 acpi_processor_cst_has_changed(pr); 736 acpi_bus_generate_proc_event(device, event, 0); 737 acpi_bus_generate_netlink_event(device->pnp.device_class, 738 dev_name(&device->dev), event, 0); 739 break; 740 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 741 acpi_processor_tstate_has_changed(pr); 742 acpi_bus_generate_proc_event(device, event, 0); 743 acpi_bus_generate_netlink_event(device->pnp.device_class, 744 dev_name(&device->dev), event, 0); 745 default: 746 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 747 "Unsupported event [0x%x]\n", event)); 748 break; 749 } 750 751 return; 752 } 753 754 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 755 unsigned long action, void *hcpu) 756 { 757 unsigned int cpu = (unsigned long)hcpu; 758 struct acpi_processor *pr = per_cpu(processors, cpu); 759 760 if (action == CPU_ONLINE && pr) { 761 acpi_processor_ppc_has_changed(pr); 762 acpi_processor_cst_has_changed(pr); 763 acpi_processor_tstate_has_changed(pr); 764 } 765 return NOTIFY_OK; 766 } 767 768 static struct notifier_block acpi_cpu_notifier = 769 { 770 .notifier_call = acpi_cpu_soft_notify, 771 }; 772 773 static int acpi_processor_add(struct acpi_device *device) 774 { 775 struct acpi_processor *pr = NULL; 776 int result = 0; 777 struct sys_device *sysdev; 778 779 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 780 if (!pr) 781 return -ENOMEM; 782 783 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 784 kfree(pr); 785 return -ENOMEM; 786 } 787 788 pr->handle = device->handle; 789 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 790 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 791 device->driver_data = pr; 792 793 result = acpi_processor_get_info(device); 794 if (result) { 795 /* Processor is physically not present */ 796 return 0; 797 } 798 799 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 800 801 /* 802 * Buggy BIOS check 803 * ACPI id of processors can be reported wrongly by the BIOS. 804 * Don't trust it blindly 805 */ 806 if (per_cpu(processor_device_array, pr->id) != NULL && 807 per_cpu(processor_device_array, pr->id) != device) { 808 printk(KERN_WARNING "BIOS reported wrong ACPI id " 809 "for the processor\n"); 810 result = -ENODEV; 811 goto err_free_cpumask; 812 } 813 per_cpu(processor_device_array, pr->id) = device; 814 815 per_cpu(processors, pr->id) = pr; 816 817 result = acpi_processor_add_fs(device); 818 if (result) 819 goto err_free_cpumask; 820 821 sysdev = get_cpu_sysdev(pr->id); 822 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { 823 result = -EFAULT; 824 goto err_remove_fs; 825 } 826 827 /* _PDC call should be done before doing anything else (if reqd.). */ 828 arch_acpi_processor_init_pdc(pr); 829 acpi_processor_set_pdc(pr); 830 arch_acpi_processor_cleanup_pdc(pr); 831 832 #ifdef CONFIG_CPU_FREQ 833 acpi_processor_ppc_has_changed(pr); 834 #endif 835 acpi_processor_get_throttling_info(pr); 836 acpi_processor_get_limit_info(pr); 837 838 839 acpi_processor_power_init(pr, device); 840 841 pr->cdev = thermal_cooling_device_register("Processor", device, 842 &processor_cooling_ops); 843 if (IS_ERR(pr->cdev)) { 844 result = PTR_ERR(pr->cdev); 845 goto err_power_exit; 846 } 847 848 dev_info(&device->dev, "registered as cooling_device%d\n", 849 pr->cdev->id); 850 851 result = sysfs_create_link(&device->dev.kobj, 852 &pr->cdev->device.kobj, 853 "thermal_cooling"); 854 if (result) { 855 printk(KERN_ERR PREFIX "Create sysfs link\n"); 856 goto err_thermal_unregister; 857 } 858 result = sysfs_create_link(&pr->cdev->device.kobj, 859 &device->dev.kobj, 860 "device"); 861 if (result) { 862 printk(KERN_ERR PREFIX "Create sysfs link\n"); 863 goto err_remove_sysfs; 864 } 865 866 return 0; 867 868 err_remove_sysfs: 869 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 870 err_thermal_unregister: 871 thermal_cooling_device_unregister(pr->cdev); 872 err_power_exit: 873 acpi_processor_power_exit(pr, device); 874 err_remove_fs: 875 acpi_processor_remove_fs(device); 876 err_free_cpumask: 877 free_cpumask_var(pr->throttling.shared_cpu_map); 878 879 return result; 880 } 881 882 static int acpi_processor_remove(struct acpi_device *device, int type) 883 { 884 struct acpi_processor *pr = NULL; 885 886 887 if (!device || !acpi_driver_data(device)) 888 return -EINVAL; 889 890 pr = acpi_driver_data(device); 891 892 if (pr->id >= nr_cpu_ids) 893 goto free; 894 895 if (type == ACPI_BUS_REMOVAL_EJECT) { 896 if (acpi_processor_handle_eject(pr)) 897 return -EINVAL; 898 } 899 900 acpi_processor_power_exit(pr, device); 901 902 sysfs_remove_link(&device->dev.kobj, "sysdev"); 903 904 acpi_processor_remove_fs(device); 905 906 if (pr->cdev) { 907 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 908 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 909 thermal_cooling_device_unregister(pr->cdev); 910 pr->cdev = NULL; 911 } 912 913 per_cpu(processors, pr->id) = NULL; 914 per_cpu(processor_device_array, pr->id) = NULL; 915 916 free: 917 free_cpumask_var(pr->throttling.shared_cpu_map); 918 kfree(pr); 919 920 return 0; 921 } 922 923 #ifdef CONFIG_ACPI_HOTPLUG_CPU 924 /**************************************************************************** 925 * Acpi processor hotplug support * 926 ****************************************************************************/ 927 928 static int is_processor_present(acpi_handle handle) 929 { 930 acpi_status status; 931 unsigned long long sta = 0; 932 933 934 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 935 936 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 937 return 1; 938 939 /* 940 * _STA is mandatory for a processor that supports hot plug 941 */ 942 if (status == AE_NOT_FOUND) 943 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 944 "Processor does not support hot plug\n")); 945 else 946 ACPI_EXCEPTION((AE_INFO, status, 947 "Processor Device is not present")); 948 return 0; 949 } 950 951 static 952 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 953 { 954 acpi_handle phandle; 955 struct acpi_device *pdev; 956 957 958 if (acpi_get_parent(handle, &phandle)) { 959 return -ENODEV; 960 } 961 962 if (acpi_bus_get_device(phandle, &pdev)) { 963 return -ENODEV; 964 } 965 966 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 967 return -ENODEV; 968 } 969 970 return 0; 971 } 972 973 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 974 u32 event, void *data) 975 { 976 struct acpi_processor *pr; 977 struct acpi_device *device = NULL; 978 int result; 979 980 981 switch (event) { 982 case ACPI_NOTIFY_BUS_CHECK: 983 case ACPI_NOTIFY_DEVICE_CHECK: 984 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 985 "Processor driver received %s event\n", 986 (event == ACPI_NOTIFY_BUS_CHECK) ? 987 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 988 989 if (!is_processor_present(handle)) 990 break; 991 992 if (acpi_bus_get_device(handle, &device)) { 993 result = acpi_processor_device_add(handle, &device); 994 if (result) 995 printk(KERN_ERR PREFIX 996 "Unable to add the device\n"); 997 break; 998 } 999 break; 1000 case ACPI_NOTIFY_EJECT_REQUEST: 1001 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1002 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 1003 1004 if (acpi_bus_get_device(handle, &device)) { 1005 printk(KERN_ERR PREFIX 1006 "Device don't exist, dropping EJECT\n"); 1007 break; 1008 } 1009 pr = acpi_driver_data(device); 1010 if (!pr) { 1011 printk(KERN_ERR PREFIX 1012 "Driver data is NULL, dropping EJECT\n"); 1013 return; 1014 } 1015 break; 1016 default: 1017 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1018 "Unsupported event [0x%x]\n", event)); 1019 break; 1020 } 1021 1022 return; 1023 } 1024 1025 static acpi_status 1026 processor_walk_namespace_cb(acpi_handle handle, 1027 u32 lvl, void *context, void **rv) 1028 { 1029 acpi_status status; 1030 int *action = context; 1031 acpi_object_type type = 0; 1032 1033 status = acpi_get_type(handle, &type); 1034 if (ACPI_FAILURE(status)) 1035 return (AE_OK); 1036 1037 if (type != ACPI_TYPE_PROCESSOR) 1038 return (AE_OK); 1039 1040 switch (*action) { 1041 case INSTALL_NOTIFY_HANDLER: 1042 acpi_install_notify_handler(handle, 1043 ACPI_SYSTEM_NOTIFY, 1044 acpi_processor_hotplug_notify, 1045 NULL); 1046 break; 1047 case UNINSTALL_NOTIFY_HANDLER: 1048 acpi_remove_notify_handler(handle, 1049 ACPI_SYSTEM_NOTIFY, 1050 acpi_processor_hotplug_notify); 1051 break; 1052 default: 1053 break; 1054 } 1055 1056 return (AE_OK); 1057 } 1058 1059 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1060 { 1061 1062 if (!is_processor_present(handle)) { 1063 return AE_ERROR; 1064 } 1065 1066 if (acpi_map_lsapic(handle, p_cpu)) 1067 return AE_ERROR; 1068 1069 if (arch_register_cpu(*p_cpu)) { 1070 acpi_unmap_lsapic(*p_cpu); 1071 return AE_ERROR; 1072 } 1073 1074 return AE_OK; 1075 } 1076 1077 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1078 { 1079 if (cpu_online(pr->id)) 1080 cpu_down(pr->id); 1081 1082 arch_unregister_cpu(pr->id); 1083 acpi_unmap_lsapic(pr->id); 1084 return (0); 1085 } 1086 #else 1087 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1088 { 1089 return AE_ERROR; 1090 } 1091 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1092 { 1093 return (-EINVAL); 1094 } 1095 #endif 1096 1097 static 1098 void acpi_processor_install_hotplug_notify(void) 1099 { 1100 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1101 int action = INSTALL_NOTIFY_HANDLER; 1102 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1103 ACPI_ROOT_OBJECT, 1104 ACPI_UINT32_MAX, 1105 processor_walk_namespace_cb, &action, NULL); 1106 #endif 1107 register_hotcpu_notifier(&acpi_cpu_notifier); 1108 } 1109 1110 static 1111 void acpi_processor_uninstall_hotplug_notify(void) 1112 { 1113 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1114 int action = UNINSTALL_NOTIFY_HANDLER; 1115 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1116 ACPI_ROOT_OBJECT, 1117 ACPI_UINT32_MAX, 1118 processor_walk_namespace_cb, &action, NULL); 1119 #endif 1120 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1121 } 1122 1123 /* 1124 * We keep the driver loaded even when ACPI is not running. 1125 * This is needed for the powernow-k8 driver, that works even without 1126 * ACPI, but needs symbols from this driver 1127 */ 1128 1129 static int __init acpi_processor_init(void) 1130 { 1131 int result = 0; 1132 1133 if (acpi_disabled) 1134 return 0; 1135 1136 memset(&errata, 0, sizeof(errata)); 1137 1138 #ifdef CONFIG_SMP 1139 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1140 (struct acpi_table_header **)&madt))) 1141 madt = NULL; 1142 #endif 1143 #ifdef CONFIG_ACPI_PROCFS 1144 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1145 if (!acpi_processor_dir) 1146 return -ENOMEM; 1147 #endif 1148 /* 1149 * Check whether the system is DMI table. If yes, OSPM 1150 * should not use mwait for CPU-states. 1151 */ 1152 dmi_check_system(processor_idle_dmi_table); 1153 result = cpuidle_register_driver(&acpi_idle_driver); 1154 if (result < 0) 1155 goto out_proc; 1156 1157 result = acpi_bus_register_driver(&acpi_processor_driver); 1158 if (result < 0) 1159 goto out_cpuidle; 1160 1161 acpi_processor_install_hotplug_notify(); 1162 1163 acpi_thermal_cpufreq_init(); 1164 1165 acpi_processor_ppc_init(); 1166 1167 acpi_processor_throttling_init(); 1168 1169 return 0; 1170 1171 out_cpuidle: 1172 cpuidle_unregister_driver(&acpi_idle_driver); 1173 1174 out_proc: 1175 #ifdef CONFIG_ACPI_PROCFS 1176 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1177 #endif 1178 1179 return result; 1180 } 1181 1182 static void __exit acpi_processor_exit(void) 1183 { 1184 if (acpi_disabled) 1185 return; 1186 1187 acpi_processor_ppc_exit(); 1188 1189 acpi_thermal_cpufreq_exit(); 1190 1191 acpi_processor_uninstall_hotplug_notify(); 1192 1193 acpi_bus_unregister_driver(&acpi_processor_driver); 1194 1195 cpuidle_unregister_driver(&acpi_idle_driver); 1196 1197 #ifdef CONFIG_ACPI_PROCFS 1198 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1199 #endif 1200 1201 return; 1202 } 1203 1204 module_init(acpi_processor_init); 1205 module_exit(acpi_processor_exit); 1206 1207 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1208 1209 MODULE_ALIAS("processor"); 1210