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 {"ACPI0007", 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_OBJECT_HID)) { 600 /* Declared with "Processor" statement; match ProcessorID */ 601 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 602 if (ACPI_FAILURE(status)) { 603 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 604 return -ENODEV; 605 } 606 607 /* 608 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 609 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 610 * arch/xxx/acpi.c 611 */ 612 pr->acpi_id = object.processor.proc_id; 613 } else { 614 /* 615 * Declared with "Device" statement; match _UID. 616 * Note that we don't handle string _UIDs yet. 617 */ 618 unsigned long long value; 619 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 620 NULL, &value); 621 if (ACPI_FAILURE(status)) { 622 printk(KERN_ERR PREFIX 623 "Evaluating processor _UID [%#x]\n", status); 624 return -ENODEV; 625 } 626 device_declaration = 1; 627 pr->acpi_id = value; 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 * On some boxes several processors use the same processor bus id. 654 * But they are located in different scope. For example: 655 * \_SB.SCK0.CPU0 656 * \_SB.SCK1.CPU0 657 * Rename the processor device bus id. And the new bus id will be 658 * generated as the following format: 659 * CPU+CPU ID. 660 */ 661 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 662 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 663 pr->acpi_id)); 664 665 if (!object.processor.pblk_address) 666 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 667 else if (object.processor.pblk_length != 6) 668 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 669 object.processor.pblk_length); 670 else { 671 pr->throttling.address = object.processor.pblk_address; 672 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 673 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 674 675 pr->pblk = object.processor.pblk_address; 676 677 /* 678 * We don't care about error returns - we just try to mark 679 * these reserved so that nobody else is confused into thinking 680 * that this region might be unused.. 681 * 682 * (In particular, allocating the IO range for Cardbus) 683 */ 684 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 685 } 686 687 /* 688 * If ACPI describes a slot number for this CPU, we can use it 689 * ensure we get the right value in the "physical id" field 690 * of /proc/cpuinfo 691 */ 692 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 693 if (ACPI_SUCCESS(status)) 694 arch_fix_phys_package_id(pr->id, object.integer.value); 695 696 return 0; 697 } 698 699 static DEFINE_PER_CPU(void *, processor_device_array); 700 701 static int __cpuinit acpi_processor_start(struct acpi_device *device) 702 { 703 int result = 0; 704 struct acpi_processor *pr; 705 struct sys_device *sysdev; 706 707 pr = acpi_driver_data(device); 708 709 result = acpi_processor_get_info(device); 710 if (result) { 711 /* Processor is physically not present */ 712 return 0; 713 } 714 715 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 716 717 /* 718 * Buggy BIOS check 719 * ACPI id of processors can be reported wrongly by the BIOS. 720 * Don't trust it blindly 721 */ 722 if (per_cpu(processor_device_array, pr->id) != NULL && 723 per_cpu(processor_device_array, pr->id) != device) { 724 printk(KERN_WARNING "BIOS reported wrong ACPI id " 725 "for the processor\n"); 726 return -ENODEV; 727 } 728 per_cpu(processor_device_array, pr->id) = device; 729 730 per_cpu(processors, pr->id) = pr; 731 732 result = acpi_processor_add_fs(device); 733 if (result) 734 goto end; 735 736 sysdev = get_cpu_sysdev(pr->id); 737 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) 738 return -EFAULT; 739 740 /* _PDC call should be done before doing anything else (if reqd.). */ 741 arch_acpi_processor_init_pdc(pr); 742 acpi_processor_set_pdc(pr); 743 arch_acpi_processor_cleanup_pdc(pr); 744 745 #ifdef CONFIG_CPU_FREQ 746 acpi_processor_ppc_has_changed(pr); 747 #endif 748 acpi_processor_get_throttling_info(pr); 749 acpi_processor_get_limit_info(pr); 750 751 752 acpi_processor_power_init(pr, device); 753 754 pr->cdev = thermal_cooling_device_register("Processor", device, 755 &processor_cooling_ops); 756 if (IS_ERR(pr->cdev)) { 757 result = PTR_ERR(pr->cdev); 758 goto end; 759 } 760 761 dev_info(&device->dev, "registered as cooling_device%d\n", 762 pr->cdev->id); 763 764 result = sysfs_create_link(&device->dev.kobj, 765 &pr->cdev->device.kobj, 766 "thermal_cooling"); 767 if (result) 768 printk(KERN_ERR PREFIX "Create sysfs link\n"); 769 result = sysfs_create_link(&pr->cdev->device.kobj, 770 &device->dev.kobj, 771 "device"); 772 if (result) 773 printk(KERN_ERR PREFIX "Create sysfs link\n"); 774 775 if (pr->flags.throttling) { 776 printk(KERN_INFO PREFIX "%s [%s] (supports", 777 acpi_device_name(device), acpi_device_bid(device)); 778 printk(" %d throttling states", pr->throttling.state_count); 779 printk(")\n"); 780 } 781 782 end: 783 784 return result; 785 } 786 787 static void acpi_processor_notify(struct acpi_device *device, u32 event) 788 { 789 struct acpi_processor *pr = acpi_driver_data(device); 790 int saved; 791 792 if (!pr) 793 return; 794 795 switch (event) { 796 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 797 saved = pr->performance_platform_limit; 798 acpi_processor_ppc_has_changed(pr); 799 if (saved == pr->performance_platform_limit) 800 break; 801 acpi_bus_generate_proc_event(device, event, 802 pr->performance_platform_limit); 803 acpi_bus_generate_netlink_event(device->pnp.device_class, 804 dev_name(&device->dev), event, 805 pr->performance_platform_limit); 806 break; 807 case ACPI_PROCESSOR_NOTIFY_POWER: 808 acpi_processor_cst_has_changed(pr); 809 acpi_bus_generate_proc_event(device, event, 0); 810 acpi_bus_generate_netlink_event(device->pnp.device_class, 811 dev_name(&device->dev), event, 0); 812 break; 813 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 814 acpi_processor_tstate_has_changed(pr); 815 acpi_bus_generate_proc_event(device, event, 0); 816 acpi_bus_generate_netlink_event(device->pnp.device_class, 817 dev_name(&device->dev), event, 0); 818 default: 819 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 820 "Unsupported event [0x%x]\n", event)); 821 break; 822 } 823 824 return; 825 } 826 827 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 828 unsigned long action, void *hcpu) 829 { 830 unsigned int cpu = (unsigned long)hcpu; 831 struct acpi_processor *pr = per_cpu(processors, cpu); 832 833 if (action == CPU_ONLINE && pr) { 834 acpi_processor_ppc_has_changed(pr); 835 acpi_processor_cst_has_changed(pr); 836 acpi_processor_tstate_has_changed(pr); 837 } 838 return NOTIFY_OK; 839 } 840 841 static struct notifier_block acpi_cpu_notifier = 842 { 843 .notifier_call = acpi_cpu_soft_notify, 844 }; 845 846 static int acpi_processor_add(struct acpi_device *device) 847 { 848 struct acpi_processor *pr = NULL; 849 850 851 if (!device) 852 return -EINVAL; 853 854 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 855 if (!pr) 856 return -ENOMEM; 857 858 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 859 kfree(pr); 860 return -ENOMEM; 861 } 862 863 pr->handle = device->handle; 864 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 865 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 866 device->driver_data = pr; 867 868 return 0; 869 } 870 871 static int acpi_processor_remove(struct acpi_device *device, int type) 872 { 873 struct acpi_processor *pr = NULL; 874 875 876 if (!device || !acpi_driver_data(device)) 877 return -EINVAL; 878 879 pr = acpi_driver_data(device); 880 881 if (pr->id >= nr_cpu_ids) 882 goto free; 883 884 if (type == ACPI_BUS_REMOVAL_EJECT) { 885 if (acpi_processor_handle_eject(pr)) 886 return -EINVAL; 887 } 888 889 acpi_processor_power_exit(pr, device); 890 891 sysfs_remove_link(&device->dev.kobj, "sysdev"); 892 893 acpi_processor_remove_fs(device); 894 895 if (pr->cdev) { 896 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 897 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 898 thermal_cooling_device_unregister(pr->cdev); 899 pr->cdev = NULL; 900 } 901 902 per_cpu(processors, pr->id) = NULL; 903 per_cpu(processor_device_array, pr->id) = NULL; 904 905 free: 906 free_cpumask_var(pr->throttling.shared_cpu_map); 907 kfree(pr); 908 909 return 0; 910 } 911 912 #ifdef CONFIG_ACPI_HOTPLUG_CPU 913 /**************************************************************************** 914 * Acpi processor hotplug support * 915 ****************************************************************************/ 916 917 static int is_processor_present(acpi_handle handle) 918 { 919 acpi_status status; 920 unsigned long long sta = 0; 921 922 923 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 924 925 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 926 return 1; 927 928 /* 929 * _STA is mandatory for a processor that supports hot plug 930 */ 931 if (status == AE_NOT_FOUND) 932 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 933 "Processor does not support hot plug\n")); 934 else 935 ACPI_EXCEPTION((AE_INFO, status, 936 "Processor Device is not present")); 937 return 0; 938 } 939 940 static 941 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 942 { 943 acpi_handle phandle; 944 struct acpi_device *pdev; 945 struct acpi_processor *pr; 946 947 948 if (acpi_get_parent(handle, &phandle)) { 949 return -ENODEV; 950 } 951 952 if (acpi_bus_get_device(phandle, &pdev)) { 953 return -ENODEV; 954 } 955 956 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 957 return -ENODEV; 958 } 959 960 acpi_bus_start(*device); 961 962 pr = acpi_driver_data(*device); 963 if (!pr) 964 return -ENODEV; 965 966 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { 967 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 968 } 969 return 0; 970 } 971 972 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 973 u32 event, void *data) 974 { 975 struct acpi_processor *pr; 976 struct acpi_device *device = NULL; 977 int result; 978 979 980 switch (event) { 981 case ACPI_NOTIFY_BUS_CHECK: 982 case ACPI_NOTIFY_DEVICE_CHECK: 983 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 984 "Processor driver received %s event\n", 985 (event == ACPI_NOTIFY_BUS_CHECK) ? 986 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 987 988 if (!is_processor_present(handle)) 989 break; 990 991 if (acpi_bus_get_device(handle, &device)) { 992 result = acpi_processor_device_add(handle, &device); 993 if (result) 994 printk(KERN_ERR PREFIX 995 "Unable to add the device\n"); 996 break; 997 } 998 999 pr = acpi_driver_data(device); 1000 if (!pr) { 1001 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 1002 break; 1003 } 1004 1005 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { 1006 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 1007 break; 1008 } 1009 1010 result = acpi_processor_start(device); 1011 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { 1012 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 1013 } else { 1014 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 1015 acpi_device_bid(device)); 1016 } 1017 break; 1018 case ACPI_NOTIFY_EJECT_REQUEST: 1019 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1020 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 1021 1022 if (acpi_bus_get_device(handle, &device)) { 1023 printk(KERN_ERR PREFIX 1024 "Device don't exist, dropping EJECT\n"); 1025 break; 1026 } 1027 pr = acpi_driver_data(device); 1028 if (!pr) { 1029 printk(KERN_ERR PREFIX 1030 "Driver data is NULL, dropping EJECT\n"); 1031 return; 1032 } 1033 1034 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) 1035 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 1036 break; 1037 default: 1038 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1039 "Unsupported event [0x%x]\n", event)); 1040 break; 1041 } 1042 1043 return; 1044 } 1045 1046 static acpi_status 1047 processor_walk_namespace_cb(acpi_handle handle, 1048 u32 lvl, void *context, void **rv) 1049 { 1050 acpi_status status; 1051 int *action = context; 1052 acpi_object_type type = 0; 1053 1054 status = acpi_get_type(handle, &type); 1055 if (ACPI_FAILURE(status)) 1056 return (AE_OK); 1057 1058 if (type != ACPI_TYPE_PROCESSOR) 1059 return (AE_OK); 1060 1061 switch (*action) { 1062 case INSTALL_NOTIFY_HANDLER: 1063 acpi_install_notify_handler(handle, 1064 ACPI_SYSTEM_NOTIFY, 1065 acpi_processor_hotplug_notify, 1066 NULL); 1067 break; 1068 case UNINSTALL_NOTIFY_HANDLER: 1069 acpi_remove_notify_handler(handle, 1070 ACPI_SYSTEM_NOTIFY, 1071 acpi_processor_hotplug_notify); 1072 break; 1073 default: 1074 break; 1075 } 1076 1077 return (AE_OK); 1078 } 1079 1080 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1081 { 1082 1083 if (!is_processor_present(handle)) { 1084 return AE_ERROR; 1085 } 1086 1087 if (acpi_map_lsapic(handle, p_cpu)) 1088 return AE_ERROR; 1089 1090 if (arch_register_cpu(*p_cpu)) { 1091 acpi_unmap_lsapic(*p_cpu); 1092 return AE_ERROR; 1093 } 1094 1095 return AE_OK; 1096 } 1097 1098 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1099 { 1100 if (cpu_online(pr->id)) 1101 cpu_down(pr->id); 1102 1103 arch_unregister_cpu(pr->id); 1104 acpi_unmap_lsapic(pr->id); 1105 return (0); 1106 } 1107 #else 1108 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1109 { 1110 return AE_ERROR; 1111 } 1112 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1113 { 1114 return (-EINVAL); 1115 } 1116 #endif 1117 1118 static 1119 void acpi_processor_install_hotplug_notify(void) 1120 { 1121 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1122 int action = INSTALL_NOTIFY_HANDLER; 1123 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1124 ACPI_ROOT_OBJECT, 1125 ACPI_UINT32_MAX, 1126 processor_walk_namespace_cb, &action, NULL); 1127 #endif 1128 register_hotcpu_notifier(&acpi_cpu_notifier); 1129 } 1130 1131 static 1132 void acpi_processor_uninstall_hotplug_notify(void) 1133 { 1134 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1135 int action = UNINSTALL_NOTIFY_HANDLER; 1136 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1137 ACPI_ROOT_OBJECT, 1138 ACPI_UINT32_MAX, 1139 processor_walk_namespace_cb, &action, NULL); 1140 #endif 1141 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1142 } 1143 1144 /* 1145 * We keep the driver loaded even when ACPI is not running. 1146 * This is needed for the powernow-k8 driver, that works even without 1147 * ACPI, but needs symbols from this driver 1148 */ 1149 1150 static int __init acpi_processor_init(void) 1151 { 1152 int result = 0; 1153 1154 if (acpi_disabled) 1155 return 0; 1156 1157 memset(&errata, 0, sizeof(errata)); 1158 1159 #ifdef CONFIG_SMP 1160 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1161 (struct acpi_table_header **)&madt))) 1162 madt = NULL; 1163 #endif 1164 1165 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1166 if (!acpi_processor_dir) 1167 return -ENOMEM; 1168 1169 /* 1170 * Check whether the system is DMI table. If yes, OSPM 1171 * should not use mwait for CPU-states. 1172 */ 1173 dmi_check_system(processor_idle_dmi_table); 1174 result = cpuidle_register_driver(&acpi_idle_driver); 1175 if (result < 0) 1176 goto out_proc; 1177 1178 result = acpi_bus_register_driver(&acpi_processor_driver); 1179 if (result < 0) 1180 goto out_cpuidle; 1181 1182 acpi_processor_install_hotplug_notify(); 1183 1184 acpi_thermal_cpufreq_init(); 1185 1186 acpi_processor_ppc_init(); 1187 1188 acpi_processor_throttling_init(); 1189 1190 return 0; 1191 1192 out_cpuidle: 1193 cpuidle_unregister_driver(&acpi_idle_driver); 1194 1195 out_proc: 1196 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1197 1198 return result; 1199 } 1200 1201 static void __exit acpi_processor_exit(void) 1202 { 1203 if (acpi_disabled) 1204 return; 1205 1206 acpi_processor_ppc_exit(); 1207 1208 acpi_thermal_cpufreq_exit(); 1209 1210 acpi_processor_uninstall_hotplug_notify(); 1211 1212 acpi_bus_unregister_driver(&acpi_processor_driver); 1213 1214 cpuidle_unregister_driver(&acpi_idle_driver); 1215 1216 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1217 1218 return; 1219 } 1220 1221 module_init(acpi_processor_init); 1222 module_exit(acpi_processor_exit); 1223 1224 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1225 1226 MODULE_ALIAS("processor"); 1227