processor_core.c revision 7237d3de78ff89ec2e18eae5fe962d063024fef5
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 75ACPI_MODULE_NAME("processor_core"); 76 77MODULE_AUTHOR("Paul Diefenbaugh"); 78MODULE_DESCRIPTION("ACPI Processor Driver"); 79MODULE_LICENSE("GPL"); 80 81static int acpi_processor_add(struct acpi_device *device); 82static int acpi_processor_start(struct acpi_device *device); 83static int acpi_processor_remove(struct acpi_device *device, int type); 84static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 85static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); 86static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 87static int acpi_processor_handle_eject(struct acpi_processor *pr); 88 89 90static const struct acpi_device_id processor_device_ids[] = { 91 {ACPI_PROCESSOR_OBJECT_HID, 0}, 92 {ACPI_PROCESSOR_HID, 0}, 93 {"", 0}, 94}; 95MODULE_DEVICE_TABLE(acpi, processor_device_ids); 96 97static 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 113static 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 121DEFINE_PER_CPU(struct acpi_processor *, processors); 122struct acpi_processor_errata errata __read_mostly; 123static 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 131static 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 151static 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 252static 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 */ 283static 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 318static struct proc_dir_entry *acpi_processor_dir = NULL; 319 320static 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 345static 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 351static 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 392static 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 412static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } 413#else 414 415static struct acpi_table_madt *madt; 416 417static 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 430static 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; 448found: 449 *apic_id = tmp; 450 return 1; 451} 452 453static 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; 477found: 478 *apic_id = tmp; 479 return 1; 480} 481 482static 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 514static 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 540exit: 541 if (buffer.pointer) 542 kfree(buffer.pointer); 543 return apic_id; 544} 545 546static 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 569static int acpi_processor_get_info(struct acpi_device *device) 570{ 571 acpi_status status = 0; 572 union acpi_object object = { 0 }; 573 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 574 struct acpi_processor *pr; 575 int cpu_index, device_declaration = 0; 576 static int cpu0_initialized; 577 578 pr = acpi_driver_data(device); 579 if (!pr) 580 return -EINVAL; 581 582 if (num_online_cpus() > 1) 583 errata.smp = TRUE; 584 585 acpi_processor_errata(pr); 586 587 /* 588 * Check to see if we have bus mastering arbitration control. This 589 * is required for proper C3 usage (to maintain cache coherency). 590 */ 591 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 592 pr->flags.bm_control = 1; 593 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 594 "Bus mastering arbitration control present\n")); 595 } else 596 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 597 "No bus mastering arbitration control\n")); 598 599 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) { 600 /* 601 * Declared with "Device" statement; match _UID. 602 * Note that we don't handle string _UIDs yet. 603 */ 604 unsigned long long value; 605 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 606 NULL, &value); 607 if (ACPI_FAILURE(status)) { 608 printk(KERN_ERR PREFIX 609 "Evaluating processor _UID [%#x]\n", status); 610 return -ENODEV; 611 } 612 device_declaration = 1; 613 pr->acpi_id = value; 614 } else { 615 /* Declared with "Processor" statement; match ProcessorID */ 616 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 617 if (ACPI_FAILURE(status)) { 618 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 619 return -ENODEV; 620 } 621 622 /* 623 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 624 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 625 * arch/xxx/acpi.c 626 */ 627 pr->acpi_id = object.processor.proc_id; 628 } 629 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); 630 631 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 632 if (!cpu0_initialized && (cpu_index == -1) && 633 (num_online_cpus() == 1)) { 634 cpu_index = 0; 635 } 636 637 cpu0_initialized = 1; 638 639 pr->id = cpu_index; 640 641 /* 642 * Extra Processor objects may be enumerated on MP systems with 643 * less than the max # of CPUs. They should be ignored _iff 644 * they are physically not present. 645 */ 646 if (pr->id == -1) { 647 if (ACPI_FAILURE 648 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 649 return -ENODEV; 650 } 651 } 652 653 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 654 pr->acpi_id)); 655 656 if (!object.processor.pblk_address) 657 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 658 else if (object.processor.pblk_length != 6) 659 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 660 object.processor.pblk_length); 661 else { 662 pr->throttling.address = object.processor.pblk_address; 663 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 664 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 665 666 pr->pblk = object.processor.pblk_address; 667 668 /* 669 * We don't care about error returns - we just try to mark 670 * these reserved so that nobody else is confused into thinking 671 * that this region might be unused.. 672 * 673 * (In particular, allocating the IO range for Cardbus) 674 */ 675 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 676 } 677 678 /* 679 * If ACPI describes a slot number for this CPU, we can use it 680 * ensure we get the right value in the "physical id" field 681 * of /proc/cpuinfo 682 */ 683 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 684 if (ACPI_SUCCESS(status)) 685 arch_fix_phys_package_id(pr->id, object.integer.value); 686 687 return 0; 688} 689 690static DEFINE_PER_CPU(void *, processor_device_array); 691 692static int __cpuinit acpi_processor_start(struct acpi_device *device) 693{ 694 int result = 0; 695 acpi_status status = AE_OK; 696 struct acpi_processor *pr; 697 struct sys_device *sysdev; 698 699 pr = acpi_driver_data(device); 700 701 result = acpi_processor_get_info(device); 702 if (result) { 703 /* Processor is physically not present */ 704 return 0; 705 } 706 707 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 708 709 /* 710 * Buggy BIOS check 711 * ACPI id of processors can be reported wrongly by the BIOS. 712 * Don't trust it blindly 713 */ 714 if (per_cpu(processor_device_array, pr->id) != NULL && 715 per_cpu(processor_device_array, pr->id) != device) { 716 printk(KERN_WARNING "BIOS reported wrong ACPI id " 717 "for the processor\n"); 718 return -ENODEV; 719 } 720 per_cpu(processor_device_array, pr->id) = device; 721 722 per_cpu(processors, pr->id) = pr; 723 724 result = acpi_processor_add_fs(device); 725 if (result) 726 goto end; 727 728 sysdev = get_cpu_sysdev(pr->id); 729 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) 730 return -EFAULT; 731 732 status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 733 acpi_processor_notify, pr); 734 735 /* _PDC call should be done before doing anything else (if reqd.). */ 736 arch_acpi_processor_init_pdc(pr); 737 acpi_processor_set_pdc(pr); 738#ifdef CONFIG_CPU_FREQ 739 acpi_processor_ppc_has_changed(pr); 740#endif 741 acpi_processor_get_throttling_info(pr); 742 acpi_processor_get_limit_info(pr); 743 744 745 acpi_processor_power_init(pr, device); 746 747 pr->cdev = thermal_cooling_device_register("Processor", device, 748 &processor_cooling_ops); 749 if (IS_ERR(pr->cdev)) { 750 result = PTR_ERR(pr->cdev); 751 goto end; 752 } 753 754 dev_info(&device->dev, "registered as cooling_device%d\n", 755 pr->cdev->id); 756 757 result = sysfs_create_link(&device->dev.kobj, 758 &pr->cdev->device.kobj, 759 "thermal_cooling"); 760 if (result) 761 printk(KERN_ERR PREFIX "Create sysfs link\n"); 762 result = sysfs_create_link(&pr->cdev->device.kobj, 763 &device->dev.kobj, 764 "device"); 765 if (result) 766 printk(KERN_ERR PREFIX "Create sysfs link\n"); 767 768 if (pr->flags.throttling) { 769 printk(KERN_INFO PREFIX "%s [%s] (supports", 770 acpi_device_name(device), acpi_device_bid(device)); 771 printk(" %d throttling states", pr->throttling.state_count); 772 printk(")\n"); 773 } 774 775 end: 776 777 return result; 778} 779 780static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) 781{ 782 struct acpi_processor *pr = data; 783 struct acpi_device *device = NULL; 784 int saved; 785 786 if (!pr) 787 return; 788 789 if (acpi_bus_get_device(pr->handle, &device)) 790 return; 791 792 switch (event) { 793 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 794 saved = pr->performance_platform_limit; 795 acpi_processor_ppc_has_changed(pr); 796 if (saved == pr->performance_platform_limit) 797 break; 798 acpi_bus_generate_proc_event(device, event, 799 pr->performance_platform_limit); 800 acpi_bus_generate_netlink_event(device->pnp.device_class, 801 dev_name(&device->dev), event, 802 pr->performance_platform_limit); 803 break; 804 case ACPI_PROCESSOR_NOTIFY_POWER: 805 acpi_processor_cst_has_changed(pr); 806 acpi_bus_generate_proc_event(device, event, 0); 807 acpi_bus_generate_netlink_event(device->pnp.device_class, 808 dev_name(&device->dev), event, 0); 809 break; 810 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 811 acpi_processor_tstate_has_changed(pr); 812 acpi_bus_generate_proc_event(device, event, 0); 813 acpi_bus_generate_netlink_event(device->pnp.device_class, 814 dev_name(&device->dev), event, 0); 815 default: 816 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 817 "Unsupported event [0x%x]\n", event)); 818 break; 819 } 820 821 return; 822} 823 824static int acpi_cpu_soft_notify(struct notifier_block *nfb, 825 unsigned long action, void *hcpu) 826{ 827 unsigned int cpu = (unsigned long)hcpu; 828 struct acpi_processor *pr = per_cpu(processors, cpu); 829 830 if (action == CPU_ONLINE && pr) { 831 acpi_processor_ppc_has_changed(pr); 832 acpi_processor_cst_has_changed(pr); 833 acpi_processor_tstate_has_changed(pr); 834 } 835 return NOTIFY_OK; 836} 837 838static struct notifier_block acpi_cpu_notifier = 839{ 840 .notifier_call = acpi_cpu_soft_notify, 841}; 842 843static int acpi_processor_add(struct acpi_device *device) 844{ 845 struct acpi_processor *pr = NULL; 846 847 848 if (!device) 849 return -EINVAL; 850 851 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 852 if (!pr) 853 return -ENOMEM; 854 855 if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 856 kfree(pr); 857 return -ENOMEM; 858 } 859 860 pr->handle = device->handle; 861 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 862 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 863 device->driver_data = pr; 864 865 return 0; 866} 867 868static int acpi_processor_remove(struct acpi_device *device, int type) 869{ 870 acpi_status status = AE_OK; 871 struct acpi_processor *pr = NULL; 872 873 874 if (!device || !acpi_driver_data(device)) 875 return -EINVAL; 876 877 pr = acpi_driver_data(device); 878 879 if (pr->id >= nr_cpu_ids) 880 goto free; 881 882 if (type == ACPI_BUS_REMOVAL_EJECT) { 883 if (acpi_processor_handle_eject(pr)) 884 return -EINVAL; 885 } 886 887 acpi_processor_power_exit(pr, device); 888 889 status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, 890 acpi_processor_notify); 891 892 sysfs_remove_link(&device->dev.kobj, "sysdev"); 893 894 acpi_processor_remove_fs(device); 895 896 if (pr->cdev) { 897 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 898 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 899 thermal_cooling_device_unregister(pr->cdev); 900 pr->cdev = NULL; 901 } 902 903 per_cpu(processors, pr->id) = NULL; 904 per_cpu(processor_device_array, pr->id) = NULL; 905 906free: 907 free_cpumask_var(pr->throttling.shared_cpu_map); 908 kfree(pr); 909 910 return 0; 911} 912 913#ifdef CONFIG_ACPI_HOTPLUG_CPU 914/**************************************************************************** 915 * Acpi processor hotplug support * 916 ****************************************************************************/ 917 918static int is_processor_present(acpi_handle handle) 919{ 920 acpi_status status; 921 unsigned long long sta = 0; 922 923 924 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 925 926 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 927 return 1; 928 929 /* 930 * _STA is mandatory for a processor that supports hot plug 931 */ 932 if (status == AE_NOT_FOUND) 933 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 934 "Processor does not support hot plug\n")); 935 else 936 ACPI_EXCEPTION((AE_INFO, status, 937 "Processor Device is not present")); 938 return 0; 939} 940 941static 942int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 943{ 944 acpi_handle phandle; 945 struct acpi_device *pdev; 946 struct acpi_processor *pr; 947 948 949 if (acpi_get_parent(handle, &phandle)) { 950 return -ENODEV; 951 } 952 953 if (acpi_bus_get_device(phandle, &pdev)) { 954 return -ENODEV; 955 } 956 957 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 958 return -ENODEV; 959 } 960 961 acpi_bus_start(*device); 962 963 pr = acpi_driver_data(*device); 964 if (!pr) 965 return -ENODEV; 966 967 if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { 968 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); 969 } 970 return 0; 971} 972 973static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 974 u32 event, void *data) 975{ 976 struct acpi_processor *pr; 977 struct acpi_device *device = NULL; 978 int result; 979 980 981 switch (event) { 982 case ACPI_NOTIFY_BUS_CHECK: 983 case ACPI_NOTIFY_DEVICE_CHECK: 984 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 985 "Processor driver received %s event\n", 986 (event == ACPI_NOTIFY_BUS_CHECK) ? 987 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 988 989 if (!is_processor_present(handle)) 990 break; 991 992 if (acpi_bus_get_device(handle, &device)) { 993 result = acpi_processor_device_add(handle, &device); 994 if (result) 995 printk(KERN_ERR PREFIX 996 "Unable to add the device\n"); 997 break; 998 } 999 1000 pr = acpi_driver_data(device); 1001 if (!pr) { 1002 printk(KERN_ERR PREFIX "Driver data is NULL\n"); 1003 break; 1004 } 1005 1006 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { 1007 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 1008 break; 1009 } 1010 1011 result = acpi_processor_start(device); 1012 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { 1013 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 1014 } else { 1015 printk(KERN_ERR PREFIX "Device [%s] failed to start\n", 1016 acpi_device_bid(device)); 1017 } 1018 break; 1019 case ACPI_NOTIFY_EJECT_REQUEST: 1020 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1021 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 1022 1023 if (acpi_bus_get_device(handle, &device)) { 1024 printk(KERN_ERR PREFIX 1025 "Device don't exist, dropping EJECT\n"); 1026 break; 1027 } 1028 pr = acpi_driver_data(device); 1029 if (!pr) { 1030 printk(KERN_ERR PREFIX 1031 "Driver data is NULL, dropping EJECT\n"); 1032 return; 1033 } 1034 1035 if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) 1036 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 1037 break; 1038 default: 1039 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1040 "Unsupported event [0x%x]\n", event)); 1041 break; 1042 } 1043 1044 return; 1045} 1046 1047static acpi_status 1048processor_walk_namespace_cb(acpi_handle handle, 1049 u32 lvl, void *context, void **rv) 1050{ 1051 acpi_status status; 1052 int *action = context; 1053 acpi_object_type type = 0; 1054 1055 status = acpi_get_type(handle, &type); 1056 if (ACPI_FAILURE(status)) 1057 return (AE_OK); 1058 1059 if (type != ACPI_TYPE_PROCESSOR) 1060 return (AE_OK); 1061 1062 switch (*action) { 1063 case INSTALL_NOTIFY_HANDLER: 1064 acpi_install_notify_handler(handle, 1065 ACPI_SYSTEM_NOTIFY, 1066 acpi_processor_hotplug_notify, 1067 NULL); 1068 break; 1069 case UNINSTALL_NOTIFY_HANDLER: 1070 acpi_remove_notify_handler(handle, 1071 ACPI_SYSTEM_NOTIFY, 1072 acpi_processor_hotplug_notify); 1073 break; 1074 default: 1075 break; 1076 } 1077 1078 return (AE_OK); 1079} 1080 1081static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1082{ 1083 1084 if (!is_processor_present(handle)) { 1085 return AE_ERROR; 1086 } 1087 1088 if (acpi_map_lsapic(handle, p_cpu)) 1089 return AE_ERROR; 1090 1091 if (arch_register_cpu(*p_cpu)) { 1092 acpi_unmap_lsapic(*p_cpu); 1093 return AE_ERROR; 1094 } 1095 1096 return AE_OK; 1097} 1098 1099static int acpi_processor_handle_eject(struct acpi_processor *pr) 1100{ 1101 if (cpu_online(pr->id)) 1102 cpu_down(pr->id); 1103 1104 arch_unregister_cpu(pr->id); 1105 acpi_unmap_lsapic(pr->id); 1106 return (0); 1107} 1108#else 1109static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1110{ 1111 return AE_ERROR; 1112} 1113static int acpi_processor_handle_eject(struct acpi_processor *pr) 1114{ 1115 return (-EINVAL); 1116} 1117#endif 1118 1119static 1120void acpi_processor_install_hotplug_notify(void) 1121{ 1122#ifdef CONFIG_ACPI_HOTPLUG_CPU 1123 int action = INSTALL_NOTIFY_HANDLER; 1124 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1125 ACPI_ROOT_OBJECT, 1126 ACPI_UINT32_MAX, 1127 processor_walk_namespace_cb, &action, NULL); 1128#endif 1129 register_hotcpu_notifier(&acpi_cpu_notifier); 1130} 1131 1132static 1133void acpi_processor_uninstall_hotplug_notify(void) 1134{ 1135#ifdef CONFIG_ACPI_HOTPLUG_CPU 1136 int action = UNINSTALL_NOTIFY_HANDLER; 1137 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1138 ACPI_ROOT_OBJECT, 1139 ACPI_UINT32_MAX, 1140 processor_walk_namespace_cb, &action, NULL); 1141#endif 1142 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1143} 1144 1145/* 1146 * We keep the driver loaded even when ACPI is not running. 1147 * This is needed for the powernow-k8 driver, that works even without 1148 * ACPI, but needs symbols from this driver 1149 */ 1150 1151static int __init acpi_processor_init(void) 1152{ 1153 int result = 0; 1154 1155 memset(&errata, 0, sizeof(errata)); 1156 1157#ifdef CONFIG_SMP 1158 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1159 (struct acpi_table_header **)&madt))) 1160 madt = NULL; 1161#endif 1162 1163 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1164 if (!acpi_processor_dir) 1165 return -ENOMEM; 1166 acpi_processor_dir->owner = THIS_MODULE; 1167 1168 /* 1169 * Check whether the system is DMI table. If yes, OSPM 1170 * should not use mwait for CPU-states. 1171 */ 1172 dmi_check_system(processor_idle_dmi_table); 1173 result = cpuidle_register_driver(&acpi_idle_driver); 1174 if (result < 0) 1175 goto out_proc; 1176 1177 result = acpi_bus_register_driver(&acpi_processor_driver); 1178 if (result < 0) 1179 goto out_cpuidle; 1180 1181 acpi_processor_install_hotplug_notify(); 1182 1183 acpi_thermal_cpufreq_init(); 1184 1185 acpi_processor_ppc_init(); 1186 1187 acpi_processor_throttling_init(); 1188 1189 return 0; 1190 1191out_cpuidle: 1192 cpuidle_unregister_driver(&acpi_idle_driver); 1193 1194out_proc: 1195 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1196 1197 return result; 1198} 1199 1200static void __exit acpi_processor_exit(void) 1201{ 1202 acpi_processor_ppc_exit(); 1203 1204 acpi_thermal_cpufreq_exit(); 1205 1206 acpi_processor_uninstall_hotplug_notify(); 1207 1208 acpi_bus_unregister_driver(&acpi_processor_driver); 1209 1210 cpuidle_unregister_driver(&acpi_idle_driver); 1211 1212 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1213 1214 return; 1215} 1216 1217module_init(acpi_processor_init); 1218module_exit(acpi_processor_exit); 1219 1220EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1221 1222MODULE_ALIAS("processor"); 1223