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