1 /* 2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <[email protected]> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> 6 * Copyright (C) 2004 Dominik Brodowski <[email protected]> 7 * Copyright (C) 2004 Anil S Keshavamurthy <[email protected]> 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 EXPORT_PER_CPU_SYMBOL(processors); 127 128 struct acpi_processor_errata errata __read_mostly; 129 130 /* -------------------------------------------------------------------------- 131 Errata Handling 132 -------------------------------------------------------------------------- */ 133 134 static int acpi_processor_errata_piix4(struct pci_dev *dev) 135 { 136 u8 value1 = 0; 137 u8 value2 = 0; 138 139 140 if (!dev) 141 return -EINVAL; 142 143 /* 144 * Note that 'dev' references the PIIX4 ACPI Controller. 145 */ 146 147 switch (dev->revision) { 148 case 0: 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); 150 break; 151 case 1: 152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); 153 break; 154 case 2: 155 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); 156 break; 157 case 3: 158 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); 159 break; 160 default: 161 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); 162 break; 163 } 164 165 switch (dev->revision) { 166 167 case 0: /* PIIX4 A-step */ 168 case 1: /* PIIX4 B-step */ 169 /* 170 * See specification changes #13 ("Manual Throttle Duty Cycle") 171 * and #14 ("Enabling and Disabling Manual Throttle"), plus 172 * erratum #5 ("STPCLK# Deassertion Time") from the January 173 * 2002 PIIX4 specification update. Applies to only older 174 * PIIX4 models. 175 */ 176 errata.piix4.throttle = 1; 177 178 case 2: /* PIIX4E */ 179 case 3: /* PIIX4M */ 180 /* 181 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA 182 * Livelock") from the January 2002 PIIX4 specification update. 183 * Applies to all PIIX4 models. 184 */ 185 186 /* 187 * BM-IDE 188 * ------ 189 * Find the PIIX4 IDE Controller and get the Bus Master IDE 190 * Status register address. We'll use this later to read 191 * each IDE controller's DMA status to make sure we catch all 192 * DMA activity. 193 */ 194 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 195 PCI_DEVICE_ID_INTEL_82371AB, 196 PCI_ANY_ID, PCI_ANY_ID, NULL); 197 if (dev) { 198 errata.piix4.bmisx = pci_resource_start(dev, 4); 199 pci_dev_put(dev); 200 } 201 202 /* 203 * Type-F DMA 204 * ---------- 205 * Find the PIIX4 ISA Controller and read the Motherboard 206 * DMA controller's status to see if Type-F (Fast) DMA mode 207 * is enabled (bit 7) on either channel. Note that we'll 208 * disable C3 support if this is enabled, as some legacy 209 * devices won't operate well if fast DMA is disabled. 210 */ 211 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 212 PCI_DEVICE_ID_INTEL_82371AB_0, 213 PCI_ANY_ID, PCI_ANY_ID, NULL); 214 if (dev) { 215 pci_read_config_byte(dev, 0x76, &value1); 216 pci_read_config_byte(dev, 0x77, &value2); 217 if ((value1 & 0x80) || (value2 & 0x80)) 218 errata.piix4.fdma = 1; 219 pci_dev_put(dev); 220 } 221 222 break; 223 } 224 225 if (errata.piix4.bmisx) 226 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 227 "Bus master activity detection (BM-IDE) erratum enabled\n")); 228 if (errata.piix4.fdma) 229 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 230 "Type-F DMA livelock erratum (C3 disabled)\n")); 231 232 return 0; 233 } 234 235 static int acpi_processor_errata(struct acpi_processor *pr) 236 { 237 int result = 0; 238 struct pci_dev *dev = NULL; 239 240 241 if (!pr) 242 return -EINVAL; 243 244 /* 245 * PIIX4 246 */ 247 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, 248 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, 249 PCI_ANY_ID, NULL); 250 if (dev) { 251 result = acpi_processor_errata_piix4(dev); 252 pci_dev_put(dev); 253 } 254 255 return result; 256 } 257 258 /* -------------------------------------------------------------------------- 259 FS Interface (/proc) 260 -------------------------------------------------------------------------- */ 261 262 #ifdef CONFIG_ACPI_PROCFS 263 static struct proc_dir_entry *acpi_processor_dir = NULL; 264 265 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) 266 { 267 struct acpi_processor *pr = seq->private; 268 269 270 if (!pr) 271 goto end; 272 273 seq_printf(seq, "processor id: %d\n" 274 "acpi id: %d\n" 275 "bus mastering control: %s\n" 276 "power management: %s\n" 277 "throttling control: %s\n" 278 "limit interface: %s\n", 279 pr->id, 280 pr->acpi_id, 281 pr->flags.bm_control ? "yes" : "no", 282 pr->flags.power ? "yes" : "no", 283 pr->flags.throttling ? "yes" : "no", 284 pr->flags.limit ? "yes" : "no"); 285 286 end: 287 return 0; 288 } 289 290 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) 291 { 292 return single_open(file, acpi_processor_info_seq_show, 293 PDE(inode)->data); 294 } 295 296 static int __cpuinit acpi_processor_add_fs(struct acpi_device *device) 297 { 298 struct proc_dir_entry *entry = NULL; 299 300 301 if (!acpi_device_dir(device)) { 302 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 303 acpi_processor_dir); 304 if (!acpi_device_dir(device)) 305 return -ENODEV; 306 } 307 308 /* 'info' [R] */ 309 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, 310 S_IRUGO, acpi_device_dir(device), 311 &acpi_processor_info_fops, 312 acpi_driver_data(device)); 313 if (!entry) 314 return -EIO; 315 316 /* 'throttling' [R/W] */ 317 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, 318 S_IFREG | S_IRUGO | S_IWUSR, 319 acpi_device_dir(device), 320 &acpi_processor_throttling_fops, 321 acpi_driver_data(device)); 322 if (!entry) 323 return -EIO; 324 325 /* 'limit' [R/W] */ 326 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, 327 S_IFREG | S_IRUGO | S_IWUSR, 328 acpi_device_dir(device), 329 &acpi_processor_limit_fops, 330 acpi_driver_data(device)); 331 if (!entry) 332 return -EIO; 333 return 0; 334 } 335 static int acpi_processor_remove_fs(struct acpi_device *device) 336 { 337 338 if (acpi_device_dir(device)) { 339 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, 340 acpi_device_dir(device)); 341 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, 342 acpi_device_dir(device)); 343 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, 344 acpi_device_dir(device)); 345 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); 346 acpi_device_dir(device) = NULL; 347 } 348 349 return 0; 350 } 351 #else 352 static inline int acpi_processor_add_fs(struct acpi_device *device) 353 { 354 return 0; 355 } 356 static inline int acpi_processor_remove_fs(struct acpi_device *device) 357 { 358 return 0; 359 } 360 #endif 361 362 /* Use the acpiid in MADT to map cpus in case of SMP */ 363 364 #ifndef CONFIG_SMP 365 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } 366 #else 367 368 static struct acpi_table_madt *madt; 369 370 static int map_lapic_id(struct acpi_subtable_header *entry, 371 u32 acpi_id, int *apic_id) 372 { 373 struct acpi_madt_local_apic *lapic = 374 (struct acpi_madt_local_apic *)entry; 375 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && 376 lapic->processor_id == acpi_id) { 377 *apic_id = lapic->id; 378 return 1; 379 } 380 return 0; 381 } 382 383 static int map_x2apic_id(struct acpi_subtable_header *entry, 384 int device_declaration, u32 acpi_id, int *apic_id) 385 { 386 struct acpi_madt_local_x2apic *apic = 387 (struct acpi_madt_local_x2apic *)entry; 388 u32 tmp = apic->local_apic_id; 389 390 /* Only check enabled APICs*/ 391 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 392 return 0; 393 394 /* Device statement declaration type */ 395 if (device_declaration) { 396 if (apic->uid == acpi_id) 397 goto found; 398 } 399 400 return 0; 401 found: 402 *apic_id = tmp; 403 return 1; 404 } 405 406 static int map_lsapic_id(struct acpi_subtable_header *entry, 407 int device_declaration, u32 acpi_id, int *apic_id) 408 { 409 struct acpi_madt_local_sapic *lsapic = 410 (struct acpi_madt_local_sapic *)entry; 411 u32 tmp = (lsapic->id << 8) | lsapic->eid; 412 413 /* Only check enabled APICs*/ 414 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 415 return 0; 416 417 /* Device statement declaration type */ 418 if (device_declaration) { 419 if (entry->length < 16) 420 printk(KERN_ERR PREFIX 421 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", 422 tmp); 423 else if (lsapic->uid == acpi_id) 424 goto found; 425 /* Processor statement declaration type */ 426 } else if (lsapic->processor_id == acpi_id) 427 goto found; 428 429 return 0; 430 found: 431 *apic_id = tmp; 432 return 1; 433 } 434 435 static int map_madt_entry(int type, u32 acpi_id) 436 { 437 unsigned long madt_end, entry; 438 int apic_id = -1; 439 440 if (!madt) 441 return apic_id; 442 443 entry = (unsigned long)madt; 444 madt_end = entry + madt->header.length; 445 446 /* Parse all entries looking for a match. */ 447 448 entry += sizeof(struct acpi_table_madt); 449 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 450 struct acpi_subtable_header *header = 451 (struct acpi_subtable_header *)entry; 452 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 453 if (map_lapic_id(header, acpi_id, &apic_id)) 454 break; 455 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 456 if (map_x2apic_id(header, type, acpi_id, &apic_id)) 457 break; 458 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 459 if (map_lsapic_id(header, type, acpi_id, &apic_id)) 460 break; 461 } 462 entry += header->length; 463 } 464 return apic_id; 465 } 466 467 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 468 { 469 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 470 union acpi_object *obj; 471 struct acpi_subtable_header *header; 472 int apic_id = -1; 473 474 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 475 goto exit; 476 477 if (!buffer.length || !buffer.pointer) 478 goto exit; 479 480 obj = buffer.pointer; 481 if (obj->type != ACPI_TYPE_BUFFER || 482 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 483 goto exit; 484 } 485 486 header = (struct acpi_subtable_header *)obj->buffer.pointer; 487 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 488 map_lapic_id(header, acpi_id, &apic_id); 489 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 490 map_lsapic_id(header, type, acpi_id, &apic_id); 491 } 492 493 exit: 494 if (buffer.pointer) 495 kfree(buffer.pointer); 496 return apic_id; 497 } 498 499 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) 500 { 501 int i; 502 int apic_id = -1; 503 504 apic_id = map_mat_entry(handle, type, acpi_id); 505 if (apic_id == -1) 506 apic_id = map_madt_entry(type, acpi_id); 507 if (apic_id == -1) 508 return apic_id; 509 510 for_each_possible_cpu(i) { 511 if (cpu_physical_id(i) == apic_id) 512 return i; 513 } 514 return -1; 515 } 516 #endif 517 518 /* -------------------------------------------------------------------------- 519 Driver Interface 520 -------------------------------------------------------------------------- */ 521 522 static int acpi_processor_get_info(struct acpi_device *device) 523 { 524 acpi_status status = 0; 525 union acpi_object object = { 0 }; 526 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 527 struct acpi_processor *pr; 528 int cpu_index, device_declaration = 0; 529 static int cpu0_initialized; 530 531 pr = acpi_driver_data(device); 532 if (!pr) 533 return -EINVAL; 534 535 if (num_online_cpus() > 1) 536 errata.smp = TRUE; 537 538 acpi_processor_errata(pr); 539 540 /* 541 * Check to see if we have bus mastering arbitration control. This 542 * is required for proper C3 usage (to maintain cache coherency). 543 */ 544 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { 545 pr->flags.bm_control = 1; 546 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 547 "Bus mastering arbitration control present\n")); 548 } else 549 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 550 "No bus mastering arbitration control\n")); 551 552 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { 553 /* Declared with "Processor" statement; match ProcessorID */ 554 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); 555 if (ACPI_FAILURE(status)) { 556 printk(KERN_ERR PREFIX "Evaluating processor object\n"); 557 return -ENODEV; 558 } 559 560 /* 561 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. 562 * >>> 'acpi_get_processor_id(acpi_id, &id)' in 563 * arch/xxx/acpi.c 564 */ 565 pr->acpi_id = object.processor.proc_id; 566 } else { 567 /* 568 * Declared with "Device" statement; match _UID. 569 * Note that we don't handle string _UIDs yet. 570 */ 571 unsigned long long value; 572 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, 573 NULL, &value); 574 if (ACPI_FAILURE(status)) { 575 printk(KERN_ERR PREFIX 576 "Evaluating processor _UID [%#x]\n", status); 577 return -ENODEV; 578 } 579 device_declaration = 1; 580 pr->acpi_id = value; 581 } 582 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); 583 584 /* Handle UP system running SMP kernel, with no LAPIC in MADT */ 585 if (!cpu0_initialized && (cpu_index == -1) && 586 (num_online_cpus() == 1)) { 587 cpu_index = 0; 588 } 589 590 cpu0_initialized = 1; 591 592 pr->id = cpu_index; 593 594 /* 595 * Extra Processor objects may be enumerated on MP systems with 596 * less than the max # of CPUs. They should be ignored _iff 597 * they are physically not present. 598 */ 599 if (pr->id == -1) { 600 if (ACPI_FAILURE 601 (acpi_processor_hotadd_init(pr->handle, &pr->id))) { 602 return -ENODEV; 603 } 604 } 605 /* 606 * On some boxes several processors use the same processor bus id. 607 * But they are located in different scope. For example: 608 * \_SB.SCK0.CPU0 609 * \_SB.SCK1.CPU0 610 * Rename the processor device bus id. And the new bus id will be 611 * generated as the following format: 612 * CPU+CPU ID. 613 */ 614 sprintf(acpi_device_bid(device), "CPU%X", pr->id); 615 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, 616 pr->acpi_id)); 617 618 if (!object.processor.pblk_address) 619 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); 620 else if (object.processor.pblk_length != 6) 621 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", 622 object.processor.pblk_length); 623 else { 624 pr->throttling.address = object.processor.pblk_address; 625 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; 626 pr->throttling.duty_width = acpi_gbl_FADT.duty_width; 627 628 pr->pblk = object.processor.pblk_address; 629 630 /* 631 * We don't care about error returns - we just try to mark 632 * these reserved so that nobody else is confused into thinking 633 * that this region might be unused.. 634 * 635 * (In particular, allocating the IO range for Cardbus) 636 */ 637 request_region(pr->throttling.address, 6, "ACPI CPU throttle"); 638 } 639 640 /* 641 * If ACPI describes a slot number for this CPU, we can use it 642 * ensure we get the right value in the "physical id" field 643 * of /proc/cpuinfo 644 */ 645 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); 646 if (ACPI_SUCCESS(status)) 647 arch_fix_phys_package_id(pr->id, object.integer.value); 648 649 return 0; 650 } 651 652 static DEFINE_PER_CPU(void *, processor_device_array); 653 654 static void acpi_processor_notify(struct acpi_device *device, u32 event) 655 { 656 struct acpi_processor *pr = acpi_driver_data(device); 657 int saved; 658 659 if (!pr) 660 return; 661 662 switch (event) { 663 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: 664 saved = pr->performance_platform_limit; 665 acpi_processor_ppc_has_changed(pr, 1); 666 if (saved == pr->performance_platform_limit) 667 break; 668 acpi_bus_generate_proc_event(device, event, 669 pr->performance_platform_limit); 670 acpi_bus_generate_netlink_event(device->pnp.device_class, 671 dev_name(&device->dev), event, 672 pr->performance_platform_limit); 673 break; 674 case ACPI_PROCESSOR_NOTIFY_POWER: 675 acpi_processor_cst_has_changed(pr); 676 acpi_bus_generate_proc_event(device, event, 0); 677 acpi_bus_generate_netlink_event(device->pnp.device_class, 678 dev_name(&device->dev), event, 0); 679 break; 680 case ACPI_PROCESSOR_NOTIFY_THROTTLING: 681 acpi_processor_tstate_has_changed(pr); 682 acpi_bus_generate_proc_event(device, event, 0); 683 acpi_bus_generate_netlink_event(device->pnp.device_class, 684 dev_name(&device->dev), event, 0); 685 default: 686 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 687 "Unsupported event [0x%x]\n", event)); 688 break; 689 } 690 691 return; 692 } 693 694 static int acpi_cpu_soft_notify(struct notifier_block *nfb, 695 unsigned long action, void *hcpu) 696 { 697 unsigned int cpu = (unsigned long)hcpu; 698 struct acpi_processor *pr = per_cpu(processors, cpu); 699 700 if (action == CPU_ONLINE && pr) { 701 acpi_processor_ppc_has_changed(pr, 0); 702 acpi_processor_cst_has_changed(pr); 703 acpi_processor_tstate_has_changed(pr); 704 } 705 return NOTIFY_OK; 706 } 707 708 static struct notifier_block acpi_cpu_notifier = 709 { 710 .notifier_call = acpi_cpu_soft_notify, 711 }; 712 713 static int __cpuinit acpi_processor_add(struct acpi_device *device) 714 { 715 struct acpi_processor *pr = NULL; 716 int result = 0; 717 struct sys_device *sysdev; 718 719 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); 720 if (!pr) 721 return -ENOMEM; 722 723 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { 724 kfree(pr); 725 return -ENOMEM; 726 } 727 728 pr->handle = device->handle; 729 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); 730 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); 731 device->driver_data = pr; 732 733 result = acpi_processor_get_info(device); 734 if (result) { 735 /* Processor is physically not present */ 736 return 0; 737 } 738 739 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); 740 741 /* 742 * Buggy BIOS check 743 * ACPI id of processors can be reported wrongly by the BIOS. 744 * Don't trust it blindly 745 */ 746 if (per_cpu(processor_device_array, pr->id) != NULL && 747 per_cpu(processor_device_array, pr->id) != device) { 748 printk(KERN_WARNING "BIOS reported wrong ACPI id " 749 "for the processor\n"); 750 result = -ENODEV; 751 goto err_free_cpumask; 752 } 753 per_cpu(processor_device_array, pr->id) = device; 754 755 per_cpu(processors, pr->id) = pr; 756 757 result = acpi_processor_add_fs(device); 758 if (result) 759 goto err_free_cpumask; 760 761 sysdev = get_cpu_sysdev(pr->id); 762 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { 763 result = -EFAULT; 764 goto err_remove_fs; 765 } 766 767 /* _PDC call should be done before doing anything else (if reqd.). */ 768 acpi_processor_set_pdc(pr->handle); 769 770 #ifdef CONFIG_CPU_FREQ 771 acpi_processor_ppc_has_changed(pr, 0); 772 #endif 773 acpi_processor_get_throttling_info(pr); 774 acpi_processor_get_limit_info(pr); 775 776 777 acpi_processor_power_init(pr, device); 778 779 pr->cdev = thermal_cooling_device_register("Processor", device, 780 &processor_cooling_ops); 781 if (IS_ERR(pr->cdev)) { 782 result = PTR_ERR(pr->cdev); 783 goto err_power_exit; 784 } 785 786 dev_dbg(&device->dev, "registered as cooling_device%d\n", 787 pr->cdev->id); 788 789 result = sysfs_create_link(&device->dev.kobj, 790 &pr->cdev->device.kobj, 791 "thermal_cooling"); 792 if (result) { 793 printk(KERN_ERR PREFIX "Create sysfs link\n"); 794 goto err_thermal_unregister; 795 } 796 result = sysfs_create_link(&pr->cdev->device.kobj, 797 &device->dev.kobj, 798 "device"); 799 if (result) { 800 printk(KERN_ERR PREFIX "Create sysfs link\n"); 801 goto err_remove_sysfs; 802 } 803 804 return 0; 805 806 err_remove_sysfs: 807 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 808 err_thermal_unregister: 809 thermal_cooling_device_unregister(pr->cdev); 810 err_power_exit: 811 acpi_processor_power_exit(pr, device); 812 err_remove_fs: 813 acpi_processor_remove_fs(device); 814 err_free_cpumask: 815 free_cpumask_var(pr->throttling.shared_cpu_map); 816 817 return result; 818 } 819 820 static int acpi_processor_remove(struct acpi_device *device, int type) 821 { 822 struct acpi_processor *pr = NULL; 823 824 825 if (!device || !acpi_driver_data(device)) 826 return -EINVAL; 827 828 pr = acpi_driver_data(device); 829 830 if (pr->id >= nr_cpu_ids) 831 goto free; 832 833 if (type == ACPI_BUS_REMOVAL_EJECT) { 834 if (acpi_processor_handle_eject(pr)) 835 return -EINVAL; 836 } 837 838 acpi_processor_power_exit(pr, device); 839 840 sysfs_remove_link(&device->dev.kobj, "sysdev"); 841 842 acpi_processor_remove_fs(device); 843 844 if (pr->cdev) { 845 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 846 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 847 thermal_cooling_device_unregister(pr->cdev); 848 pr->cdev = NULL; 849 } 850 851 per_cpu(processors, pr->id) = NULL; 852 per_cpu(processor_device_array, pr->id) = NULL; 853 854 free: 855 free_cpumask_var(pr->throttling.shared_cpu_map); 856 kfree(pr); 857 858 return 0; 859 } 860 861 #ifdef CONFIG_ACPI_HOTPLUG_CPU 862 /**************************************************************************** 863 * Acpi processor hotplug support * 864 ****************************************************************************/ 865 866 static int is_processor_present(acpi_handle handle) 867 { 868 acpi_status status; 869 unsigned long long sta = 0; 870 871 872 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 873 874 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) 875 return 1; 876 877 /* 878 * _STA is mandatory for a processor that supports hot plug 879 */ 880 if (status == AE_NOT_FOUND) 881 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 882 "Processor does not support hot plug\n")); 883 else 884 ACPI_EXCEPTION((AE_INFO, status, 885 "Processor Device is not present")); 886 return 0; 887 } 888 889 static 890 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 891 { 892 acpi_handle phandle; 893 struct acpi_device *pdev; 894 895 896 if (acpi_get_parent(handle, &phandle)) { 897 return -ENODEV; 898 } 899 900 if (acpi_bus_get_device(phandle, &pdev)) { 901 return -ENODEV; 902 } 903 904 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { 905 return -ENODEV; 906 } 907 908 return 0; 909 } 910 911 static void __ref acpi_processor_hotplug_notify(acpi_handle handle, 912 u32 event, void *data) 913 { 914 struct acpi_processor *pr; 915 struct acpi_device *device = NULL; 916 int result; 917 918 919 switch (event) { 920 case ACPI_NOTIFY_BUS_CHECK: 921 case ACPI_NOTIFY_DEVICE_CHECK: 922 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 923 "Processor driver received %s event\n", 924 (event == ACPI_NOTIFY_BUS_CHECK) ? 925 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); 926 927 if (!is_processor_present(handle)) 928 break; 929 930 if (acpi_bus_get_device(handle, &device)) { 931 result = acpi_processor_device_add(handle, &device); 932 if (result) 933 printk(KERN_ERR PREFIX 934 "Unable to add the device\n"); 935 break; 936 } 937 break; 938 case ACPI_NOTIFY_EJECT_REQUEST: 939 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 940 "received ACPI_NOTIFY_EJECT_REQUEST\n")); 941 942 if (acpi_bus_get_device(handle, &device)) { 943 printk(KERN_ERR PREFIX 944 "Device don't exist, dropping EJECT\n"); 945 break; 946 } 947 pr = acpi_driver_data(device); 948 if (!pr) { 949 printk(KERN_ERR PREFIX 950 "Driver data is NULL, dropping EJECT\n"); 951 return; 952 } 953 break; 954 default: 955 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 956 "Unsupported event [0x%x]\n", event)); 957 break; 958 } 959 960 return; 961 } 962 963 static acpi_status 964 processor_walk_namespace_cb(acpi_handle handle, 965 u32 lvl, void *context, void **rv) 966 { 967 acpi_status status; 968 int *action = context; 969 acpi_object_type type = 0; 970 971 status = acpi_get_type(handle, &type); 972 if (ACPI_FAILURE(status)) 973 return (AE_OK); 974 975 if (type != ACPI_TYPE_PROCESSOR) 976 return (AE_OK); 977 978 switch (*action) { 979 case INSTALL_NOTIFY_HANDLER: 980 acpi_install_notify_handler(handle, 981 ACPI_SYSTEM_NOTIFY, 982 acpi_processor_hotplug_notify, 983 NULL); 984 break; 985 case UNINSTALL_NOTIFY_HANDLER: 986 acpi_remove_notify_handler(handle, 987 ACPI_SYSTEM_NOTIFY, 988 acpi_processor_hotplug_notify); 989 break; 990 default: 991 break; 992 } 993 994 return (AE_OK); 995 } 996 997 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 998 { 999 1000 if (!is_processor_present(handle)) { 1001 return AE_ERROR; 1002 } 1003 1004 if (acpi_map_lsapic(handle, p_cpu)) 1005 return AE_ERROR; 1006 1007 if (arch_register_cpu(*p_cpu)) { 1008 acpi_unmap_lsapic(*p_cpu); 1009 return AE_ERROR; 1010 } 1011 1012 return AE_OK; 1013 } 1014 1015 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1016 { 1017 if (cpu_online(pr->id)) 1018 cpu_down(pr->id); 1019 1020 arch_unregister_cpu(pr->id); 1021 acpi_unmap_lsapic(pr->id); 1022 return (0); 1023 } 1024 #else 1025 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) 1026 { 1027 return AE_ERROR; 1028 } 1029 static int acpi_processor_handle_eject(struct acpi_processor *pr) 1030 { 1031 return (-EINVAL); 1032 } 1033 #endif 1034 1035 static 1036 void acpi_processor_install_hotplug_notify(void) 1037 { 1038 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1039 int action = INSTALL_NOTIFY_HANDLER; 1040 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1041 ACPI_ROOT_OBJECT, 1042 ACPI_UINT32_MAX, 1043 processor_walk_namespace_cb, NULL, &action, NULL); 1044 #endif 1045 register_hotcpu_notifier(&acpi_cpu_notifier); 1046 } 1047 1048 static 1049 void acpi_processor_uninstall_hotplug_notify(void) 1050 { 1051 #ifdef CONFIG_ACPI_HOTPLUG_CPU 1052 int action = UNINSTALL_NOTIFY_HANDLER; 1053 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, 1054 ACPI_ROOT_OBJECT, 1055 ACPI_UINT32_MAX, 1056 processor_walk_namespace_cb, NULL, &action, NULL); 1057 #endif 1058 unregister_hotcpu_notifier(&acpi_cpu_notifier); 1059 } 1060 1061 /* 1062 * We keep the driver loaded even when ACPI is not running. 1063 * This is needed for the powernow-k8 driver, that works even without 1064 * ACPI, but needs symbols from this driver 1065 */ 1066 1067 static int __init acpi_processor_init(void) 1068 { 1069 int result = 0; 1070 1071 if (acpi_disabled) 1072 return 0; 1073 1074 memset(&errata, 0, sizeof(errata)); 1075 1076 #ifdef CONFIG_SMP 1077 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 1078 (struct acpi_table_header **)&madt))) 1079 madt = NULL; 1080 #endif 1081 #ifdef CONFIG_ACPI_PROCFS 1082 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1083 if (!acpi_processor_dir) 1084 return -ENOMEM; 1085 #endif 1086 result = cpuidle_register_driver(&acpi_idle_driver); 1087 if (result < 0) 1088 goto out_proc; 1089 1090 result = acpi_bus_register_driver(&acpi_processor_driver); 1091 if (result < 0) 1092 goto out_cpuidle; 1093 1094 acpi_processor_install_hotplug_notify(); 1095 1096 acpi_thermal_cpufreq_init(); 1097 1098 acpi_processor_ppc_init(); 1099 1100 acpi_processor_throttling_init(); 1101 1102 return 0; 1103 1104 out_cpuidle: 1105 cpuidle_unregister_driver(&acpi_idle_driver); 1106 1107 out_proc: 1108 #ifdef CONFIG_ACPI_PROCFS 1109 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1110 #endif 1111 1112 return result; 1113 } 1114 1115 static void __exit acpi_processor_exit(void) 1116 { 1117 if (acpi_disabled) 1118 return; 1119 1120 acpi_processor_ppc_exit(); 1121 1122 acpi_thermal_cpufreq_exit(); 1123 1124 acpi_processor_uninstall_hotplug_notify(); 1125 1126 acpi_bus_unregister_driver(&acpi_processor_driver); 1127 1128 cpuidle_unregister_driver(&acpi_idle_driver); 1129 1130 #ifdef CONFIG_ACPI_PROCFS 1131 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); 1132 #endif 1133 1134 return; 1135 } 1136 1137 module_init(acpi_processor_init); 1138 module_exit(acpi_processor_exit); 1139 1140 EXPORT_SYMBOL(acpi_processor_set_thermal_limit); 1141 1142 MODULE_ALIAS("processor"); 1143