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 PREFIX "ACPI: " 63 64 #define ACPI_PROCESSOR_CLASS "processor" 65 #define ACPI_PROCESSOR_DEVICE_NAME "Processor" 66 #define ACPI_PROCESSOR_FILE_INFO "info" 67 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 68 #define ACPI_PROCESSOR_FILE_LIMIT "limit" 69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 70 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 72 73 #define ACPI_PROCESSOR_LIMIT_USER 0 74 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 75 76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 77 ACPI_MODULE_NAME("processor_core"); 78 79 MODULE_AUTHOR("Paul Diefenbaugh"); 80 MODULE_DESCRIPTION("ACPI Processor Driver"); 81 MODULE_LICENSE("GPL"); 82 83 static int acpi_processor_add(struct acpi_device *device); 84 static int acpi_processor_remove(struct acpi_device *device, int type); 85 #ifdef CONFIG_ACPI_PROCFS 86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); 87 #endif 88 static void acpi_processor_notify(struct acpi_device *device, u32 event); 89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); 90 static int acpi_processor_handle_eject(struct acpi_processor *pr); 91 92 93 static const struct acpi_device_id processor_device_ids[] = { 94 {ACPI_PROCESSOR_OBJECT_HID, 0}, 95 {"ACPI0007", 0}, 96 {"", 0}, 97 }; 98 MODULE_DEVICE_TABLE(acpi, processor_device_ids); 99 100 static struct acpi_driver acpi_processor_driver = { 101 .name = "processor", 102 .class = ACPI_PROCESSOR_CLASS, 103 .ids = processor_device_ids, 104 .ops = { 105 .add = acpi_processor_add, 106 .remove = acpi_processor_remove, 107 .suspend = acpi_processor_suspend, 108 .resume = acpi_processor_resume, 109 .notify = acpi_processor_notify, 110 }, 111 }; 112 113 #define INSTALL_NOTIFY_HANDLER 1 114 #define UNINSTALL_NOTIFY_HANDLER 2 115 #ifdef CONFIG_ACPI_PROCFS 116 static const struct file_operations acpi_processor_info_fops = { 117 .owner = THIS_MODULE, 118 .open = acpi_processor_info_open_fs, 119 .read = seq_read, 120 .llseek = seq_lseek, 121 .release = single_release, 122 }; 123 #endif 124 125 DEFINE_PER_CPU(struct acpi_processor *, processors); 126 struct acpi_processor_errata errata __read_mostly; 127 128 /* -------------------------------------------------------------------------- 129 Errata Handling 130 -------------------------------------------------------------------------- */ 131 132 static int acpi_processor_errata_piix4(struct pci_dev *dev) 133 { 134 u8 value1 = 0; 135 u8 value2 = 0; 136 137 138 if (!dev) 139 return -EINVAL; 140 141 /* 142 * Note that 'dev' references the PIIX4 ACPI Controller. 143 */ 144 145 switch (dev->revision) { 146 case 0: 147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 148 break; 149 case 1: 150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 151 break; 152 case 2: 153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 154 break; 155 case 3: 156 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 157 break; 158 default: 159 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 160 break; 161 } 162 163 switch (dev->revision) { 164 165 case 0: /* PIIX4 A-step */ 166 case 1: /* PIIX4 B-step */ 167 /* 168 * See specification changes #13 ("Manual Throttle Duty Cycle") 169 * and #14 ("Enabling and Disabling Manual Throttle"), plus 170 * erratum #5 ("STPCLK# Deassertion Time") from the January 171 * 2002 PIIX4 specification update. Applies to only older 172 * PIIX4 models. 173 */ 174 errata.piix4.throttle = 1; 175 176 case 2: /* PIIX4E */ 177 case 3: /* PIIX4M */ 178 /* 179 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 180 * Livelock") from the January 2002 PIIX4 specification update. 181 * Applies to all PIIX4 models. 182 */ 183 184 /* 185 * BM-IDE 186 * ------ 187 * Find the PIIX4 IDE Controller and get the Bus Master IDE 188 * Status register address. We'll use this later to read 189 * each IDE controller's DMA status to make sure we catch all 190 * DMA activity. 191 */ 192 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 193 PCI_DEVICE_ID_INTEL_82371AB, 194 PCI_ANY_ID, PCI_ANY_ID, NULL); 195 if (dev) { 196 errata.piix4.bmisx = pci_resource_start(dev, 4); 197 pci_dev_put(dev); 198 } 199 200 /* 201 * Type-F DMA 202 * ---------- 203 * Find the PIIX4 ISA Controller and read the Motherboard 204 * DMA controller's status to see if Type-F (Fast) DMA mode 205 * is enabled (bit 7) on either channel. Note that we'll 206 * disable C3 support if this is enabled, as some legacy 207 * devices won't operate well if fast DMA is disabled. 208 */ 209 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 210 PCI_DEVICE_ID_INTEL_82371AB_0, 211 PCI_ANY_ID, PCI_ANY_ID, NULL); 212 if (dev) { 213 pci_read_config_byte(dev, 0x76, &value1); 214 pci_read_config_byte(dev, 0x77, &value2); 215 if ((value1 & 0x80) || (value2 & 0x80)) 216 errata.piix4.fdma = 1; 217 pci_dev_put(dev); 218 } 219 220 break; 221 } 222 223 if (errata.piix4.bmisx) 224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 225 "Bus master activity detection (BM-IDE) erratum enabled\n")); 226 if (errata.piix4.fdma) 227 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 228 "Type-F DMA livelock erratum (C3 disabled)\n")); 229 230 return 0; 231 } 232 233 static int acpi_processor_errata(struct acpi_processor *pr) 234 { 235 int result = 0; 236 struct pci_dev *dev = NULL; 237 238 239 if (!pr) 240 return -EINVAL; 241 242 /* 243 * PIIX4 244 */ 245 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 246 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 247 PCI_ANY_ID, NULL); 248 if (dev) { 249 result = acpi_processor_errata_piix4(dev); 250 pci_dev_put(dev); 251 } 252 253 return result; 254 } 255 256 /* -------------------------------------------------------------------------- 257 FS Interface (/proc) 258 -------------------------------------------------------------------------- */ 259 260 #ifdef CONFIG_ACPI_PROCFS 261 static struct proc_dir_entry *acpi_processor_dir = NULL; 262 263 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 264 { 265 struct acpi_processor *pr = seq->private; 266 267 268 if (!pr) 269 goto end; 270 271 seq_printf(seq, "processor id: %d\n" 272 "acpi id: %d\n" 273 "bus mastering control: %s\n" 274 "power management: %s\n" 275 "throttling control: %s\n" 276 "limit interface: %s\n", 277 pr->id, 278 pr->acpi_id, 279 pr->flags.bm_control ? "yes" : "no", 280 pr->flags.power ? "yes" : "no", 281 pr->flags.throttling ? "yes" : "no", 282 pr->flags.limit ? "yes" : "no"); 283 284 end: 285 return 0; 286 } 287 288 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 289 { 290 return single_open(file, acpi_processor_info_seq_show, 291 PDE(inode)->data); 292 } 293 294 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device) 295 { 296 struct proc_dir_entry *entry = NULL; 297 298 299 if (!acpi_device_dir(device)) { 300 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 301 acpi_processor_dir); 302 if (!acpi_device_dir(device)) 303 return -ENODEV; 304 } 305 306 /* 'info' [R] */ 307 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, 308 S_IRUGO, acpi_device_dir(device), 309 &acpi_processor_info_fops, 310 acpi_driver_data(device)); 311 if (!entry) 312 return -EIO; 313 314 /* 'throttling' [R/W] */ 315 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, 316 S_IFREG | S_IRUGO | S_IWUSR, 317 acpi_device_dir(device), 318 &acpi_processor_throttling_fops, 319 acpi_driver_data(device)); 320 if (!entry) 321 return -EIO; 322 323 /* 'limit' [R/W] */ 324 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, 325 S_IFREG | S_IRUGO | S_IWUSR, 326 acpi_device_dir(device), 327 &acpi_processor_limit_fops, 328 acpi_driver_data(device)); 329 if (!entry) 330 return -EIO; 331 return 0; 332 } 333 static int acpi_processor_remove_fs(struct acpi_device *device) 334 { 335 336 if (acpi_device_dir(device)) { 337 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 338 acpi_device_dir(device)); 339 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 340 acpi_device_dir(device)); 341 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 342 acpi_device_dir(device)); 343 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 344 acpi_device_dir(device) = NULL; 345 } 346 347 return 0; 348 } 349 #else 350 static inline int acpi_processor_add_fs(struct acpi_device *device) 351 { 352 return 0; 353 } 354 static inline int acpi_processor_remove_fs(struct acpi_device *device) 355 { 356 return 0; 357 } 358 #endif 359 360 /* Use the acpiid in MADT to map cpus in case of SMP */ 361 362 #ifndef CONFIG_SMP 363 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } 364 #else 365 366 static struct acpi_table_madt *madt; 367 368 static int map_lapic_id(struct acpi_subtable_header *entry, 369 u32 acpi_id, int *apic_id) 370 { 371 struct acpi_madt_local_apic *lapic = 372 (struct acpi_madt_local_apic *)entry; 373 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 374 lapic->processor_id == acpi_id) { 375 *apic_id = lapic->id; 376 return 1; 377 } 378 return 0; 379 } 380 381 static int map_x2apic_id(struct acpi_subtable_header *entry, 382 int device_declaration, u32 acpi_id, int *apic_id) 383 { 384 struct acpi_madt_local_x2apic *apic = 385 (struct acpi_madt_local_x2apic *)entry; 386 u32 tmp = apic->local_apic_id; 387 388 /* Only check enabled APICs*/ 389 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 390 return 0; 391 392 /* Device statement declaration type */ 393 if (device_declaration) { 394 if (apic->uid == acpi_id) 395 goto found; 396 } 397 398 return 0; 399 found: 400 *apic_id = tmp; 401 return 1; 402 } 403 404 static int map_lsapic_id(struct acpi_subtable_header *entry, 405 int device_declaration, u32 acpi_id, int *apic_id) 406 { 407 struct acpi_madt_local_sapic *lsapic = 408 (struct acpi_madt_local_sapic *)entry; 409 u32 tmp = (lsapic->id << 8) | lsapic->eid; 410 411 /* Only check enabled APICs*/ 412 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 413 return 0; 414 415 /* Device statement declaration type */ 416 if (device_declaration) { 417 if (entry->length < 16) 418 printk(KERN_ERR PREFIX 419 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", 420 tmp); 421 else if (lsapic->uid == acpi_id) 422 goto found; 423 /* Processor statement declaration type */ 424 } else if (lsapic->processor_id == acpi_id) 425 goto found; 426 427 return 0; 428 found: 429 *apic_id = tmp; 430 return 1; 431 } 432 433 static int map_madt_entry(int type, u32 acpi_id) 434 { 435 unsigned long madt_end, entry; 436 int apic_id = -1; 437 438 if (!madt) 439 return apic_id; 440 441 entry = (unsigned long)madt; 442 madt_end = entry + madt->header.length; 443 444 /* Parse all entries looking for a match. */ 445 446 entry += sizeof(struct acpi_table_madt); 447 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 448 struct acpi_subtable_header *header = 449 (struct acpi_subtable_header *)entry; 450 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 451 if (map_lapic_id(header, acpi_id, &apic_id)) 452 break; 453 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 454 if (map_x2apic_id(header, type, acpi_id, &apic_id)) 455 break; 456 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 457 if (map_lsapic_id(header, type, acpi_id, &apic_id)) 458 break; 459 } 460 entry += header->length; 461 } 462 return apic_id; 463 } 464 465 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 466 { 467 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 468 union acpi_object *obj; 469 struct acpi_subtable_header *header; 470 int apic_id = -1; 471 472 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 473 goto exit; 474 475 if (!buffer.length || !buffer.pointer) 476 goto exit; 477 478 obj = buffer.pointer; 479 if (obj->type != ACPI_TYPE_BUFFER || 480 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 481 goto exit; 482 } 483 484 header = (struct acpi_subtable_header *)obj->buffer.pointer; 485 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 486 map_lapic_id(header, acpi_id, &apic_id); 487 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 488 map_lsapic_id(header, type, acpi_id, &apic_id); 489 } 490 491 exit: 492 if (buffer.pointer) 493 kfree(buffer.pointer); 494 return apic_id; 495 } 496 497 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) 498 { 499 int i; 500 int apic_id = -1; 501 502 apic_id = map_mat_entry(handle, type, acpi_id); 503 if (apic_id == -1) 504 apic_id = map_madt_entry(type, acpi_id); 505 if (apic_id == -1) 506 return apic_id; 507 508 for_each_possible_cpu(i) { 509 if (cpu_physical_id(i) == apic_id) 510 return i; 511 } 512 return -1; 513 } 514 #endif 515 516 /* -------------------------------------------------------------------------- 517 Driver Interface 518 -------------------------------------------------------------------------- */ 519 520 static int acpi_processor_get_info(struct acpi_device *device) 521 { 522 acpi_status status = 0; 523 union acpi_object object = { 0 }; 524 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 525 struct acpi_processor *pr; 526 int cpu_index, device_declaration = 0; 527 static int cpu0_initialized; 528 529 pr = acpi_driver_data(device); 530 if (!pr) 531 return -EINVAL; 532 533 if (num_online_cpus() > 1) 534 errata.smp = TRUE; 535 536 acpi_processor_errata(pr); 537 538 /* 539 * Check to see if we have bus mastering arbitration control. This 540 * is required for proper C3 usage (to maintain cache coherency). 541 */ 542 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 543 pr->flags.bm_control = 1; 544 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 545 "Bus mastering arbitration control present\n")); 546 } else 547 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 548 "No bus mastering arbitration control\n")); 549 550 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 551 /* Declared with "Processor" statement; match ProcessorID */ 552 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 553 if (ACPI_FAILURE(status)) { 554 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 555 return -ENODEV; 556 } 557 558 /* 559 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 560 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 561 * arch/xxx/acpi.c 562 */ 563 pr->acpi_id = object.processor.proc_id; 564 } else { 565 /* 566 * Declared with "Device" statement; match _UID. 567 * Note that we don't handle string _UIDs yet. 568 */ 569 unsigned long long value; 570 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 571 NULL, &value); 572 if (ACPI_FAILURE(status)) { 573 printk(KERN_ERR PREFIX 574 "Evaluating processor _UID [%#x]\n", status); 575 return -ENODEV; 576 } 577 device_declaration = 1; 578 pr->acpi_id = value; 579 } 580 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); 581 582 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 583 if (!cpu0_initialized && (cpu_index == -1) && 584 (num_online_cpus() == 1)) { 585 cpu_index = 0; 586 } 587 588 cpu0_initialized = 1; 589 590 pr->id = cpu_index; 591 592 /* 593 * Extra Processor objects may be enumerated on MP systems with 594 * less than the max # of CPUs. They should be ignored _iff 595 * they are physically not present. 596 */ 597 if (pr->id == -1) { 598 if (ACPI_FAILURE 599 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 600 return -ENODEV; 601 } 602 } 603 /* 604 * On some boxes several processors use the same processor bus id. 605 * But they are located in different scope. For example: 606 * \_SB.SCK0.CPU0 607 * \_SB.SCK1.CPU0 608 * Rename the processor device bus id. And the new bus id will be 609 * generated as the following format: 610 * CPU+CPU ID. 611 */ 612 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 613 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 614 pr->acpi_id)); 615 616 if (!object.processor.pblk_address) 617 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 618 else if (object.processor.pblk_length != 6) 619 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 620 object.processor.pblk_length); 621 else { 622 pr->throttling.address = object.processor.pblk_address; 623 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 624 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 625 626 pr->pblk = object.processor.pblk_address; 627 628 /* 629 * We don't care about error returns - we just try to mark 630 * these reserved so that nobody else is confused into thinking 631 * that this region might be unused.. 632 * 633 * (In particular, allocating the IO range for Cardbus) 634 */ 635 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 636 } 637 638 /* 639 * If ACPI describes a slot number for this CPU, we can use it 640 * ensure we get the right value in the "physical id" field 641 * of /proc/cpuinfo 642 */ 643 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 644 if (ACPI_SUCCESS(status)) 645 arch_fix_phys_package_id(pr->id, object.integer.value); 646 647 return 0; 648 } 649 650 static DEFINE_PER_CPU(void *, processor_device_array); 651 652 static void acpi_processor_notify(struct acpi_device *device, u32 event) 653 { 654 struct acpi_processor *pr = acpi_driver_data(device); 655 int saved; 656 657 if (!pr) 658 return; 659 660 switch (event) { 661 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 662 saved = pr->performance_platform_limit; 663 acpi_processor_ppc_has_changed(pr, 1); 664 if (saved == pr->performance_platform_limit) 665 break; 666 acpi_bus_generate_proc_event(device, event, 667 pr->performance_platform_limit); 668 acpi_bus_generate_netlink_event(device->pnp.device_class, 669 dev_name(&device->dev), event, 670 pr->performance_platform_limit); 671 break; 672 case ACPI_PROCESSOR_NOTIFY_POWER: 673 acpi_processor_cst_has_changed(pr); 674 acpi_bus_generate_proc_event(device, event, 0); 675 acpi_bus_generate_netlink_event(device->pnp.device_class, 676 dev_name(&device->dev), event, 0); 677 break; 678 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 679 acpi_processor_tstate_has_changed(pr); 680 acpi_bus_generate_proc_event(device, event, 0); 681 acpi_bus_generate_netlink_event(device->pnp.device_class, 682 dev_name(&device->dev), event, 0); 683 default: 684 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 685 "Unsupported event [0x%x]\n", event)); 686 break; 687 } 688 689 return; 690 } 691 692 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 693 unsigned long action, void *hcpu) 694 { 695 unsigned int cpu = (unsigned long)hcpu; 696 struct acpi_processor *pr = per_cpu(processors, cpu); 697 698 if (action == CPU_ONLINE && pr) { 699 acpi_processor_ppc_has_changed(pr, 0); 700 acpi_processor_cst_has_changed(pr); 701 acpi_processor_tstate_has_changed(pr); 702 } 703 return NOTIFY_OK; 704 } 705 706 static struct notifier_block acpi_cpu_notifier = 707 { 708 .notifier_call = acpi_cpu_soft_notify, 709 }; 710 711 static int __cpuinit acpi_processor_add(struct acpi_device *device) 712 { 713 struct acpi_processor *pr = NULL; 714 int result = 0; 715 struct sys_device *sysdev; 716 717 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 718 if (!pr) 719 return -ENOMEM; 720 721 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 722 kfree(pr); 723 return -ENOMEM; 724 } 725 726 pr->handle = device->handle; 727 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 728 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 729 device->driver_data = pr; 730 731 result = acpi_processor_get_info(device); 732 if (result) { 733 /* Processor is physically not present */ 734 return 0; 735 } 736 737 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 738 739 /* 740 * Buggy BIOS check 741 * ACPI id of processors can be reported wrongly by the BIOS. 742 * Don't trust it blindly 743 */ 744 if (per_cpu(processor_device_array, pr->id) != NULL && 745 per_cpu(processor_device_array, pr->id) != device) { 746 printk(KERN_WARNING "BIOS reported wrong ACPI id " 747 "for the processor\n"); 748 result = -ENODEV; 749 goto err_free_cpumask; 750 } 751 per_cpu(processor_device_array, pr->id) = device; 752 753 per_cpu(processors, pr->id) = pr; 754 755 result = acpi_processor_add_fs(device); 756 if (result) 757 goto err_free_cpumask; 758 759 sysdev = get_cpu_sysdev(pr->id); 760 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { 761 result = -EFAULT; 762 goto err_remove_fs; 763 } 764 765 /* _PDC call should be done before doing anything else (if reqd.). */ 766 acpi_processor_set_pdc(pr->handle); 767 768 #ifdef CONFIG_CPU_FREQ 769 acpi_processor_ppc_has_changed(pr, 0); 770 #endif 771 acpi_processor_get_throttling_info(pr); 772 acpi_processor_get_limit_info(pr); 773 774 775 acpi_processor_power_init(pr, device); 776 777 pr->cdev = thermal_cooling_device_register("Processor", device, 778 &processor_cooling_ops); 779 if (IS_ERR(pr->cdev)) { 780 result = PTR_ERR(pr->cdev); 781 goto err_power_exit; 782 } 783 784 dev_dbg(&device->dev, "registered as cooling_device%d\n", 785 pr->cdev->id); 786 787 result = sysfs_create_link(&device->dev.kobj, 788 &pr->cdev->device.kobj, 789 "thermal_cooling"); 790 if (result) { 791 printk(KERN_ERR PREFIX "Create sysfs link\n"); 792 goto err_thermal_unregister; 793 } 794 result = sysfs_create_link(&pr->cdev->device.kobj, 795 &device->dev.kobj, 796 "device"); 797 if (result) { 798 printk(KERN_ERR PREFIX "Create sysfs link\n"); 799 goto err_remove_sysfs; 800 } 801 802 return 0; 803 804 err_remove_sysfs: 805 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 806 err_thermal_unregister: 807 thermal_cooling_device_unregister(pr->cdev); 808 err_power_exit: 809 acpi_processor_power_exit(pr, device); 810 err_remove_fs: 811 acpi_processor_remove_fs(device); 812 err_free_cpumask: 813 free_cpumask_var(pr->throttling.shared_cpu_map); 814 815 return result; 816 } 817 818 static int acpi_processor_remove(struct acpi_device *device, int type) 819 { 820 struct acpi_processor *pr = NULL; 821 822 823 if (!device || !acpi_driver_data(device)) 824 return -EINVAL; 825 826 pr = acpi_driver_data(device); 827 828 if (pr->id >= nr_cpu_ids) 829 goto free; 830 831 if (type == ACPI_BUS_REMOVAL_EJECT) { 832 if (acpi_processor_handle_eject(pr)) 833 return -EINVAL; 834 } 835 836 acpi_processor_power_exit(pr, device); 837 838 sysfs_remove_link(&device->dev.kobj, "sysdev"); 839 840 acpi_processor_remove_fs(device); 841 842 if (pr->cdev) { 843 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 844 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 845 thermal_cooling_device_unregister(pr->cdev); 846 pr->cdev = NULL; 847 } 848 849 per_cpu(processors, pr->id) = NULL; 850 per_cpu(processor_device_array, pr->id) = NULL; 851 852 free: 853 free_cpumask_var(pr->throttling.shared_cpu_map); 854 kfree(pr); 855 856 return 0; 857 } 858 859 #ifdef CONFIG_ACPI_HOTPLUG_CPU 860 /**************************************************************************** 861 * Acpi processor hotplug support * 862 ****************************************************************************/ 863 864 static int is_processor_present(acpi_handle handle) 865 { 866 acpi_status status; 867 unsigned long long sta = 0; 868 869 870 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 871 872 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 873 return 1; 874 875 /* 876 * _STA is mandatory for a processor that supports hot plug 877 */ 878 if (status == AE_NOT_FOUND) 879 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 880 "Processor does not support hot plug\n")); 881 else 882 ACPI_EXCEPTION((AE_INFO, status, 883 "Processor Device is not present")); 884 return 0; 885 } 886 887 static 888 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 889 { 890 acpi_handle phandle; 891 struct acpi_device *pdev; 892 893 894 if (acpi_get_parent(handle, &phandle)) { 895 return -ENODEV; 896 } 897 898 if (acpi_bus_get_device(phandle, &pdev)) { 899 return -ENODEV; 900 } 901 902 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 903 return -ENODEV; 904 } 905 906 return 0; 907 } 908 909 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 910 u32 event, void *data) 911 { 912 struct acpi_processor *pr; 913 struct acpi_device *device = NULL; 914 int result; 915 916 917 switch (event) { 918 case ACPI_NOTIFY_BUS_CHECK: 919 case ACPI_NOTIFY_DEVICE_CHECK: 920 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 921 "Processor driver received %s event\n", 922 (event == ACPI_NOTIFY_BUS_CHECK) ? 923 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 924 925 if (!is_processor_present(handle)) 926 break; 927 928 if (acpi_bus_get_device(handle, &device)) { 929 result = acpi_processor_device_add(handle, &device); 930 if (result) 931 printk(KERN_ERR PREFIX 932 "Unable to add the device\n"); 933 break; 934 } 935 break; 936 case ACPI_NOTIFY_EJECT_REQUEST: 937 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 938 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 939 940 if (acpi_bus_get_device(handle, &device)) { 941 printk(KERN_ERR PREFIX 942 "Device don't exist, dropping EJECT\n"); 943 break; 944 } 945 pr = acpi_driver_data(device); 946 if (!pr) { 947 printk(KERN_ERR PREFIX 948 "Driver data is NULL, dropping EJECT\n"); 949 return; 950 } 951 break; 952 default: 953 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 954 "Unsupported event [0x%x]\n", event)); 955 break; 956 } 957 958 return; 959 } 960 961 static acpi_status 962 processor_walk_namespace_cb(acpi_handle handle, 963 u32 lvl, void *context, void **rv) 964 { 965 acpi_status status; 966 int *action = context; 967 acpi_object_type type = 0; 968 969 status = acpi_get_type(handle, &type); 970 if (ACPI_FAILURE(status)) 971 return (AE_OK); 972 973 if (type != ACPI_TYPE_PROCESSOR) 974 return (AE_OK); 975 976 switch (*action) { 977 case INSTALL_NOTIFY_HANDLER: 978 acpi_install_notify_handler(handle, 979 ACPI_SYSTEM_NOTIFY, 980 acpi_processor_hotplug_notify, 981 NULL); 982 break; 983 case UNINSTALL_NOTIFY_HANDLER: 984 acpi_remove_notify_handler(handle, 985 ACPI_SYSTEM_NOTIFY, 986 acpi_processor_hotplug_notify); 987 break; 988 default: 989 break; 990 } 991 992 return (AE_OK); 993 } 994 995 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 996 { 997 998 if (!is_processor_present(handle)) { 999 return AE_ERROR; 1000 } 1001 1002 if (acpi_map_lsapic(handle, p_cpu)) 1003 return AE_ERROR; 1004 1005 if (arch_register_cpu(*p_cpu)) { 1006 acpi_unmap_lsapic(*p_cpu); 1007 return AE_ERROR; 1008 } 1009 1010 return AE_OK; 1011 } 1012 1013 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1014 { 1015 if (cpu_online(pr->id)) 1016 cpu_down(pr->id); 1017 1018 arch_unregister_cpu(pr->id); 1019 acpi_unmap_lsapic(pr->id); 1020 return (0); 1021 } 1022 #else 1023 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1024 { 1025 return AE_ERROR; 1026 } 1027 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1028 { 1029 return (-EINVAL); 1030 } 1031 #endif 1032 1033 static 1034 void acpi_processor_install_hotplug_notify(void) 1035 { 1036 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1037 int action = INSTALL_NOTIFY_HANDLER; 1038 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1039 ACPI_ROOT_OBJECT, 1040 ACPI_UINT32_MAX, 1041 processor_walk_namespace_cb, NULL, &action, NULL); 1042 #endif 1043 register_hotcpu_notifier(&acpi_cpu_notifier); 1044 } 1045 1046 static 1047 void acpi_processor_uninstall_hotplug_notify(void) 1048 { 1049 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1050 int action = UNINSTALL_NOTIFY_HANDLER; 1051 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1052 ACPI_ROOT_OBJECT, 1053 ACPI_UINT32_MAX, 1054 processor_walk_namespace_cb, NULL, &action, NULL); 1055 #endif 1056 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1057 } 1058 1059 /* 1060 * We keep the driver loaded even when ACPI is not running. 1061 * This is needed for the powernow-k8 driver, that works even without 1062 * ACPI, but needs symbols from this driver 1063 */ 1064 1065 static int __init acpi_processor_init(void) 1066 { 1067 int result = 0; 1068 1069 if (acpi_disabled) 1070 return 0; 1071 1072 memset(&errata, 0, sizeof(errata)); 1073 1074 #ifdef CONFIG_SMP 1075 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1076 (struct acpi_table_header **)&madt))) 1077 madt = NULL; 1078 #endif 1079 #ifdef CONFIG_ACPI_PROCFS 1080 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1081 if (!acpi_processor_dir) 1082 return -ENOMEM; 1083 #endif 1084 result = cpuidle_register_driver(&acpi_idle_driver); 1085 if (result < 0) 1086 goto out_proc; 1087 1088 result = acpi_bus_register_driver(&acpi_processor_driver); 1089 if (result < 0) 1090 goto out_cpuidle; 1091 1092 acpi_processor_install_hotplug_notify(); 1093 1094 acpi_thermal_cpufreq_init(); 1095 1096 acpi_processor_ppc_init(); 1097 1098 acpi_processor_throttling_init(); 1099 1100 return 0; 1101 1102 out_cpuidle: 1103 cpuidle_unregister_driver(&acpi_idle_driver); 1104 1105 out_proc: 1106 #ifdef CONFIG_ACPI_PROCFS 1107 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1108 #endif 1109 1110 return result; 1111 } 1112 1113 static void __exit acpi_processor_exit(void) 1114 { 1115 if (acpi_disabled) 1116 return; 1117 1118 acpi_processor_ppc_exit(); 1119 1120 acpi_thermal_cpufreq_exit(); 1121 1122 acpi_processor_uninstall_hotplug_notify(); 1123 1124 acpi_bus_unregister_driver(&acpi_processor_driver); 1125 1126 cpuidle_unregister_driver(&acpi_idle_driver); 1127 1128 #ifdef CONFIG_ACPI_PROCFS 1129 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1130 #endif 1131 1132 return; 1133 } 1134 1135 module_init(acpi_processor_init); 1136 module_exit(acpi_processor_exit); 1137 1138 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1139 1140 MODULE_ALIAS("processor"); 1141