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 acpi_device_dir(device)->owner = THIS_MODULE; 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_lsapic_id(struct acpi_subtable_header *entry, 431 int device_declaration, u32 acpi_id, int *apic_id) 432 { 433 struct acpi_madt_local_sapic *lsapic = 434 (struct acpi_madt_local_sapic *)entry; 435 u32 tmp = (lsapic->id << 8) | lsapic->eid; 436 437 /* Only check enabled APICs*/ 438 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 439 return 0; 440 441 /* Device statement declaration type */ 442 if (device_declaration) { 443 if (entry->length < 16) 444 printk(KERN_ERR PREFIX 445 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", 446 tmp); 447 else if (lsapic->uid == acpi_id) 448 goto found; 449 /* Processor statement declaration type */ 450 } else if (lsapic->processor_id == acpi_id) 451 goto found; 452 453 return 0; 454 found: 455 *apic_id = tmp; 456 return 1; 457 } 458 459 static int map_madt_entry(int type, u32 acpi_id) 460 { 461 unsigned long madt_end, entry; 462 int apic_id = -1; 463 464 if (!madt) 465 return apic_id; 466 467 entry = (unsigned long)madt; 468 madt_end = entry + madt->header.length; 469 470 /* Parse all entries looking for a match. */ 471 472 entry += sizeof(struct acpi_table_madt); 473 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 474 struct acpi_subtable_header *header = 475 (struct acpi_subtable_header *)entry; 476 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 477 if (map_lapic_id(header, acpi_id, &apic_id)) 478 break; 479 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 480 if (map_lsapic_id(header, type, acpi_id, &apic_id)) 481 break; 482 } 483 entry += header->length; 484 } 485 return apic_id; 486 } 487 488 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 489 { 490 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 491 union acpi_object *obj; 492 struct acpi_subtable_header *header; 493 int apic_id = -1; 494 495 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 496 goto exit; 497 498 if (!buffer.length || !buffer.pointer) 499 goto exit; 500 501 obj = buffer.pointer; 502 if (obj->type != ACPI_TYPE_BUFFER || 503 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 504 goto exit; 505 } 506 507 header = (struct acpi_subtable_header *)obj->buffer.pointer; 508 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 509 map_lapic_id(header, acpi_id, &apic_id); 510 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 511 map_lsapic_id(header, type, acpi_id, &apic_id); 512 } 513 514 exit: 515 if (buffer.pointer) 516 kfree(buffer.pointer); 517 return apic_id; 518 } 519 520 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) 521 { 522 int i; 523 int apic_id = -1; 524 525 apic_id = map_mat_entry(handle, type, acpi_id); 526 if (apic_id == -1) 527 apic_id = map_madt_entry(type, acpi_id); 528 if (apic_id == -1) 529 return apic_id; 530 531 for_each_possible_cpu(i) { 532 if (cpu_physical_id(i) == apic_id) 533 return i; 534 } 535 return -1; 536 } 537 #endif 538 539 /* -------------------------------------------------------------------------- 540 Driver Interface 541 -------------------------------------------------------------------------- */ 542 543 static int acpi_processor_get_info(struct acpi_device *device) 544 { 545 acpi_status status = 0; 546 union acpi_object object = { 0 }; 547 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 548 struct acpi_processor *pr; 549 int cpu_index, device_declaration = 0; 550 static int cpu0_initialized; 551 552 pr = acpi_driver_data(device); 553 if (!pr) 554 return -EINVAL; 555 556 if (num_online_cpus() > 1) 557 errata.smp = TRUE; 558 559 acpi_processor_errata(pr); 560 561 /* 562 * Check to see if we have bus mastering arbitration control. This 563 * is required for proper C3 usage (to maintain cache coherency). 564 */ 565 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 566 pr->flags.bm_control = 1; 567 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 568 "Bus mastering arbitration control present\n")); 569 } else 570 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 571 "No bus mastering arbitration control\n")); 572 573 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) { 574 /* 575 * Declared with "Device" statement; match _UID. 576 * Note that we don't handle string _UIDs yet. 577 */ 578 unsigned long long value; 579 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 580 NULL, &value); 581 if (ACPI_FAILURE(status)) { 582 printk(KERN_ERR PREFIX 583 "Evaluating processor _UID [%#x]\n", status); 584 return -ENODEV; 585 } 586 device_declaration = 1; 587 pr->acpi_id = value; 588 } else { 589 /* Declared with "Processor" statement; match ProcessorID */ 590 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 591 if (ACPI_FAILURE(status)) { 592 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 593 return -ENODEV; 594 } 595 596 /* 597 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 598 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 599 * arch/xxx/acpi.c 600 */ 601 pr->acpi_id = object.processor.proc_id; 602 } 603 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); 604 605 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 606 if (!cpu0_initialized && (cpu_index == -1) && 607 (num_online_cpus() == 1)) { 608 cpu_index = 0; 609 } 610 611 cpu0_initialized = 1; 612 613 pr->id = cpu_index; 614 615 /* 616 * Extra Processor objects may be enumerated on MP systems with 617 * less than the max # of CPUs. They should be ignored _iff 618 * they are physically not present. 619 */ 620 if (pr->id == -1) { 621 if (ACPI_FAILURE 622 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 623 return -ENODEV; 624 } 625 } 626 627 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 628 pr->acpi_id)); 629 630 if (!object.processor.pblk_address) 631 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 632 else if (object.processor.pblk_length != 6) 633 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 634 object.processor.pblk_length); 635 else { 636 pr->throttling.address = object.processor.pblk_address; 637 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 638 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 639 640 pr->pblk = object.processor.pblk_address; 641 642 /* 643 * We don't care about error returns - we just try to mark 644 * these reserved so that nobody else is confused into thinking 645 * that this region might be unused.. 646 * 647 * (In particular, allocating the IO range for Cardbus) 648 */ 649 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 650 } 651 652 /* 653 * If ACPI describes a slot number for this CPU, we can use it 654 * ensure we get the right value in the "physical id" field 655 * of /proc/cpuinfo 656 */ 657 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 658 if (ACPI_SUCCESS(status)) 659 arch_fix_phys_package_id(pr->id, object.integer.value); 660 661 return 0; 662 } 663 664 static DEFINE_PER_CPU(void *, processor_device_array); 665 666 static int __cpuinit acpi_processor_start(struct acpi_device *device) 667 { 668 int result = 0; 669 acpi_status status = AE_OK; 670 struct acpi_processor *pr; 671 struct sys_device *sysdev; 672 673 pr = acpi_driver_data(device); 674 675 result = acpi_processor_get_info(device); 676 if (result) { 677 /* Processor is physically not present */ 678 return 0; 679 } 680 681 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 682 683 /* 684 * Buggy BIOS check 685 * ACPI id of processors can be reported wrongly by the BIOS. 686 * Don't trust it blindly 687 */ 688 if (per_cpu(processor_device_array, pr->id) != NULL && 689 per_cpu(processor_device_array, pr->id) != device) { 690 printk(KERN_WARNING "BIOS reported wrong ACPI id " 691 "for the processor\n"); 692 return -ENODEV; 693 } 694 per_cpu(processor_device_array, pr->id) = device; 695 696 per_cpu(processors, pr->id) = pr; 697 698 result = acpi_processor_add_fs(device); 699 if (result) 700 goto end; 701 702 sysdev = get_cpu_sysdev(pr->id); 703 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) 704 return -EFAULT; 705 706 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 707 acpi_processor_notify, pr); 708 709 /* _PDC call should be done before doing anything else (if reqd.). */ 710 arch_acpi_processor_init_pdc(pr); 711 acpi_processor_set_pdc(pr); 712 #ifdef CONFIG_CPU_FREQ 713 acpi_processor_ppc_has_changed(pr); 714 #endif 715 acpi_processor_get_throttling_info(pr); 716 acpi_processor_get_limit_info(pr); 717 718 719 acpi_processor_power_init(pr, device); 720 721 pr->cdev = thermal_cooling_device_register("Processor", device, 722 &processor_cooling_ops); 723 if (IS_ERR(pr->cdev)) { 724 result = PTR_ERR(pr->cdev); 725 goto end; 726 } 727 728 dev_info(&device->dev, "registered as cooling_device%d\n", 729 pr->cdev->id); 730 731 result = sysfs_create_link(&device->dev.kobj, 732 &pr->cdev->device.kobj, 733 "thermal_cooling"); 734 if (result) 735 printk(KERN_ERR PREFIX "Create sysfs link\n"); 736 result = sysfs_create_link(&pr->cdev->device.kobj, 737 &device->dev.kobj, 738 "device"); 739 if (result) 740 printk(KERN_ERR PREFIX "Create sysfs link\n"); 741 742 if (pr->flags.throttling) { 743 printk(KERN_INFO PREFIX "%s [%s] (supports", 744 acpi_device_name(device), acpi_device_bid(device)); 745 printk(" %d throttling states", pr->throttling.state_count); 746 printk(")\n"); 747 } 748 749 end: 750 751 return result; 752 } 753 754 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 755 { 756 struct acpi_processor *pr = data; 757 struct acpi_device *device = NULL; 758 int saved; 759 760 if (!pr) 761 return; 762 763 if (acpi_bus_get_device(pr->handle, &device)) 764 return; 765 766 switch (event) { 767 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 768 saved = pr->performance_platform_limit; 769 acpi_processor_ppc_has_changed(pr); 770 if (saved == pr->performance_platform_limit) 771 break; 772 acpi_bus_generate_proc_event(device, event, 773 pr->performance_platform_limit); 774 acpi_bus_generate_netlink_event(device->pnp.device_class, 775 dev_name(&device->dev), event, 776 pr->performance_platform_limit); 777 break; 778 case ACPI_PROCESSOR_NOTIFY_POWER: 779 acpi_processor_cst_has_changed(pr); 780 acpi_bus_generate_proc_event(device, event, 0); 781 acpi_bus_generate_netlink_event(device->pnp.device_class, 782 dev_name(&device->dev), event, 0); 783 break; 784 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 785 acpi_processor_tstate_has_changed(pr); 786 acpi_bus_generate_proc_event(device, event, 0); 787 acpi_bus_generate_netlink_event(device->pnp.device_class, 788 dev_name(&device->dev), event, 0); 789 default: 790 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 791 "Unsupported event [0x%x]\n", event)); 792 break; 793 } 794 795 return; 796 } 797 798 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 799 unsigned long action, void *hcpu) 800 { 801 unsigned int cpu = (unsigned long)hcpu; 802 struct acpi_processor *pr = per_cpu(processors, cpu); 803 804 if (action == CPU_ONLINE && pr) { 805 acpi_processor_ppc_has_changed(pr); 806 acpi_processor_cst_has_changed(pr); 807 acpi_processor_tstate_has_changed(pr); 808 } 809 return NOTIFY_OK; 810 } 811 812 static struct notifier_block acpi_cpu_notifier = 813 { 814 .notifier_call = acpi_cpu_soft_notify, 815 }; 816 817 static int acpi_processor_add(struct acpi_device *device) 818 { 819 struct acpi_processor *pr = NULL; 820 821 822 if (!device) 823 return -EINVAL; 824 825 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 826 if (!pr) 827 return -ENOMEM; 828 829 pr->handle = device->handle; 830 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 831 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 832 device->driver_data = pr; 833 834 return 0; 835 } 836 837 static int acpi_processor_remove(struct acpi_device *device, int type) 838 { 839 acpi_status status = AE_OK; 840 struct acpi_processor *pr = NULL; 841 842 843 if (!device || !acpi_driver_data(device)) 844 return -EINVAL; 845 846 pr = acpi_driver_data(device); 847 848 if (pr->id >= nr_cpu_ids) { 849 kfree(pr); 850 return 0; 851 } 852 853 if (type == ACPI_BUS_REMOVAL_EJECT) { 854 if (acpi_processor_handle_eject(pr)) 855 return -EINVAL; 856 } 857 858 acpi_processor_power_exit(pr, device); 859 860 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 861 acpi_processor_notify); 862 863 sysfs_remove_link(&device->dev.kobj, "sysdev"); 864 865 acpi_processor_remove_fs(device); 866 867 if (pr->cdev) { 868 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 869 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 870 thermal_cooling_device_unregister(pr->cdev); 871 pr->cdev = NULL; 872 } 873 874 per_cpu(processors, pr->id) = NULL; 875 per_cpu(processor_device_array, pr->id) = NULL; 876 kfree(pr); 877 878 return 0; 879 } 880 881 #ifdef CONFIG_ACPI_HOTPLUG_CPU 882 /**************************************************************************** 883 * Acpi processor hotplug support * 884 ****************************************************************************/ 885 886 static int is_processor_present(acpi_handle handle) 887 { 888 acpi_status status; 889 unsigned long long sta = 0; 890 891 892 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 893 894 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 895 return 1; 896 897 /* 898 * _STA is mandatory for a processor that supports hot plug 899 */ 900 if (status == AE_NOT_FOUND) 901 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 902 "Processor does not support hot plug\n")); 903 else 904 ACPI_EXCEPTION((AE_INFO, status, 905 "Processor Device is not present")); 906 return 0; 907 } 908 909 static 910 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 911 { 912 acpi_handle phandle; 913 struct acpi_device *pdev; 914 struct acpi_processor *pr; 915 916 917 if (acpi_get_parent(handle, &phandle)) { 918 return -ENODEV; 919 } 920 921 if (acpi_bus_get_device(phandle, &pdev)) { 922 return -ENODEV; 923 } 924 925 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 926 return -ENODEV; 927 } 928 929 acpi_bus_start(*device); 930 931 pr = acpi_driver_data(*device); 932 if (!pr) 933 return -ENODEV; 934 935 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { 936 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 937 } 938 return 0; 939 } 940 941 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 942 u32 event, void *data) 943 { 944 struct acpi_processor *pr; 945 struct acpi_device *device = NULL; 946 int result; 947 948 949 switch (event) { 950 case ACPI_NOTIFY_BUS_CHECK: 951 case ACPI_NOTIFY_DEVICE_CHECK: 952 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 953 "Processor driver received %s event\n", 954 (event == ACPI_NOTIFY_BUS_CHECK) ? 955 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 956 957 if (!is_processor_present(handle)) 958 break; 959 960 if (acpi_bus_get_device(handle, &device)) { 961 result = acpi_processor_device_add(handle, &device); 962 if (result) 963 printk(KERN_ERR PREFIX 964 "Unable to add the device\n"); 965 break; 966 } 967 968 pr = acpi_driver_data(device); 969 if (!pr) { 970 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 971 break; 972 } 973 974 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { 975 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 976 break; 977 } 978 979 result = acpi_processor_start(device); 980 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { 981 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 982 } else { 983 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 984 acpi_device_bid(device)); 985 } 986 break; 987 case ACPI_NOTIFY_EJECT_REQUEST: 988 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 989 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 990 991 if (acpi_bus_get_device(handle, &device)) { 992 printk(KERN_ERR PREFIX 993 "Device don't exist, dropping EJECT\n"); 994 break; 995 } 996 pr = acpi_driver_data(device); 997 if (!pr) { 998 printk(KERN_ERR PREFIX 999 "Driver data is NULL, dropping EJECT\n"); 1000 return; 1001 } 1002 1003 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) 1004 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 1005 break; 1006 default: 1007 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1008 "Unsupported event [0x%x]\n", event)); 1009 break; 1010 } 1011 1012 return; 1013 } 1014 1015 static acpi_status 1016 processor_walk_namespace_cb(acpi_handle handle, 1017 u32 lvl, void *context, void **rv) 1018 { 1019 acpi_status status; 1020 int *action = context; 1021 acpi_object_type type = 0; 1022 1023 status = acpi_get_type(handle, &type); 1024 if (ACPI_FAILURE(status)) 1025 return (AE_OK); 1026 1027 if (type != ACPI_TYPE_PROCESSOR) 1028 return (AE_OK); 1029 1030 switch (*action) { 1031 case INSTALL_NOTIFY_HANDLER: 1032 acpi_install_notify_handler(handle, 1033 ACPI_SYSTEM_NOTIFY, 1034 acpi_processor_hotplug_notify, 1035 NULL); 1036 break; 1037 case UNINSTALL_NOTIFY_HANDLER: 1038 acpi_remove_notify_handler(handle, 1039 ACPI_SYSTEM_NOTIFY, 1040 acpi_processor_hotplug_notify); 1041 break; 1042 default: 1043 break; 1044 } 1045 1046 return (AE_OK); 1047 } 1048 1049 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1050 { 1051 1052 if (!is_processor_present(handle)) { 1053 return AE_ERROR; 1054 } 1055 1056 if (acpi_map_lsapic(handle, p_cpu)) 1057 return AE_ERROR; 1058 1059 if (arch_register_cpu(*p_cpu)) { 1060 acpi_unmap_lsapic(*p_cpu); 1061 return AE_ERROR; 1062 } 1063 1064 return AE_OK; 1065 } 1066 1067 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1068 { 1069 if (cpu_online(pr->id)) 1070 cpu_down(pr->id); 1071 1072 arch_unregister_cpu(pr->id); 1073 acpi_unmap_lsapic(pr->id); 1074 return (0); 1075 } 1076 #else 1077 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1078 { 1079 return AE_ERROR; 1080 } 1081 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1082 { 1083 return (-EINVAL); 1084 } 1085 #endif 1086 1087 static 1088 void acpi_processor_install_hotplug_notify(void) 1089 { 1090 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1091 int action = INSTALL_NOTIFY_HANDLER; 1092 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1093 ACPI_ROOT_OBJECT, 1094 ACPI_UINT32_MAX, 1095 processor_walk_namespace_cb, &action, NULL); 1096 #endif 1097 register_hotcpu_notifier(&acpi_cpu_notifier); 1098 } 1099 1100 static 1101 void acpi_processor_uninstall_hotplug_notify(void) 1102 { 1103 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1104 int action = UNINSTALL_NOTIFY_HANDLER; 1105 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1106 ACPI_ROOT_OBJECT, 1107 ACPI_UINT32_MAX, 1108 processor_walk_namespace_cb, &action, NULL); 1109 #endif 1110 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1111 } 1112 1113 /* 1114 * We keep the driver loaded even when ACPI is not running. 1115 * This is needed for the powernow-k8 driver, that works even without 1116 * ACPI, but needs symbols from this driver 1117 */ 1118 1119 static int __init acpi_processor_init(void) 1120 { 1121 int result = 0; 1122 1123 memset(&errata, 0, sizeof(errata)); 1124 1125 #ifdef CONFIG_SMP 1126 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1127 (struct acpi_table_header **)&madt))) 1128 madt = NULL; 1129 #endif 1130 1131 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1132 if (!acpi_processor_dir) 1133 return -ENOMEM; 1134 acpi_processor_dir->owner = THIS_MODULE; 1135 1136 /* 1137 * Check whether the system is DMI table. If yes, OSPM 1138 * should not use mwait for CPU-states. 1139 */ 1140 dmi_check_system(processor_idle_dmi_table); 1141 result = cpuidle_register_driver(&acpi_idle_driver); 1142 if (result < 0) 1143 goto out_proc; 1144 1145 result = acpi_bus_register_driver(&acpi_processor_driver); 1146 if (result < 0) 1147 goto out_cpuidle; 1148 1149 acpi_processor_install_hotplug_notify(); 1150 1151 acpi_thermal_cpufreq_init(); 1152 1153 acpi_processor_ppc_init(); 1154 1155 acpi_processor_throttling_init(); 1156 1157 return 0; 1158 1159 out_cpuidle: 1160 cpuidle_unregister_driver(&acpi_idle_driver); 1161 1162 out_proc: 1163 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1164 1165 return result; 1166 } 1167 1168 static void __exit acpi_processor_exit(void) 1169 { 1170 acpi_processor_ppc_exit(); 1171 1172 acpi_thermal_cpufreq_exit(); 1173 1174 acpi_processor_uninstall_hotplug_notify(); 1175 1176 acpi_bus_unregister_driver(&acpi_processor_driver); 1177 1178 cpuidle_unregister_driver(&acpi_idle_driver); 1179 1180 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1181 1182 return; 1183 } 1184 1185 module_init(acpi_processor_init); 1186 module_exit(acpi_processor_exit); 1187 1188 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1189 1190 MODULE_ALIAS("processor"); 1191