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