1 /* 2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) 3 * 4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or (at 11 * your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 */ 24 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/ioport.h> 28 #include <linux/kernel.h> 29 #include <linux/list.h> 30 #include <linux/sched.h> 31 #include <linux/pm.h> 32 #include <linux/device.h> 33 #include <linux/proc_fs.h> 34 #include <linux/acpi.h> 35 #include <linux/slab.h> 36 #ifdef CONFIG_X86 37 #include <asm/mpspec.h> 38 #endif 39 #include <linux/pci.h> 40 #include <acpi/acpi_bus.h> 41 #include <acpi/acpi_drivers.h> 42 #include <acpi/apei.h> 43 #include <linux/dmi.h> 44 #include <linux/suspend.h> 45 46 #include "internal.h" 47 48 #define _COMPONENT ACPI_BUS_COMPONENT 49 ACPI_MODULE_NAME("bus"); 50 51 struct acpi_device *acpi_root; 52 struct proc_dir_entry *acpi_root_dir; 53 EXPORT_SYMBOL(acpi_root_dir); 54 55 #define STRUCT_TO_INT(s) (*((int*)&s)) 56 57 58 #ifdef CONFIG_X86 59 static int set_copy_dsdt(const struct dmi_system_id *id) 60 { 61 printk(KERN_NOTICE "%s detected - " 62 "force copy of DSDT to local memory\n", id->ident); 63 acpi_gbl_copy_dsdt_locally = 1; 64 return 0; 65 } 66 67 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 68 /* 69 * Invoke DSDT corruption work-around on all Toshiba Satellite. 70 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 71 */ 72 { 73 .callback = set_copy_dsdt, 74 .ident = "TOSHIBA Satellite", 75 .matches = { 76 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 77 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 78 }, 79 }, 80 {} 81 }; 82 #else 83 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 84 {} 85 }; 86 #endif 87 88 /* -------------------------------------------------------------------------- 89 Device Management 90 -------------------------------------------------------------------------- */ 91 92 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 93 unsigned long long *sta) 94 { 95 acpi_status status; 96 97 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 98 if (ACPI_SUCCESS(status)) 99 return AE_OK; 100 101 if (status == AE_NOT_FOUND) { 102 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 103 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 104 return AE_OK; 105 } 106 return status; 107 } 108 109 int acpi_bus_get_status(struct acpi_device *device) 110 { 111 acpi_status status; 112 unsigned long long sta; 113 114 status = acpi_bus_get_status_handle(device->handle, &sta); 115 if (ACPI_FAILURE(status)) 116 return -ENODEV; 117 118 STRUCT_TO_INT(device->status) = (int) sta; 119 120 if (device->status.functional && !device->status.present) { 121 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 122 "functional but not present;\n", 123 device->pnp.bus_id, 124 (u32) STRUCT_TO_INT(device->status))); 125 } 126 127 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 128 device->pnp.bus_id, 129 (u32) STRUCT_TO_INT(device->status))); 130 return 0; 131 } 132 EXPORT_SYMBOL(acpi_bus_get_status); 133 134 void acpi_bus_private_data_handler(acpi_handle handle, 135 void *context) 136 { 137 return; 138 } 139 EXPORT_SYMBOL(acpi_bus_private_data_handler); 140 141 int acpi_bus_get_private_data(acpi_handle handle, void **data) 142 { 143 acpi_status status; 144 145 if (!*data) 146 return -EINVAL; 147 148 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 149 if (ACPI_FAILURE(status) || !*data) { 150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 151 handle)); 152 return -ENODEV; 153 } 154 155 return 0; 156 } 157 EXPORT_SYMBOL(acpi_bus_get_private_data); 158 159 static void acpi_print_osc_error(acpi_handle handle, 160 struct acpi_osc_context *context, char *error) 161 { 162 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 163 int i; 164 165 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 166 printk(KERN_DEBUG "%s\n", error); 167 else { 168 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 169 kfree(buffer.pointer); 170 } 171 printk(KERN_DEBUG"_OSC request data:"); 172 for (i = 0; i < context->cap.length; i += sizeof(u32)) 173 printk("%x ", *((u32 *)(context->cap.pointer + i))); 174 printk("\n"); 175 } 176 177 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 178 { 179 int i; 180 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 181 24, 26, 28, 30, 32, 34}; 182 183 if (strlen(str) != 36) 184 return AE_BAD_PARAMETER; 185 for (i = 0; i < 36; i++) { 186 if (i == 8 || i == 13 || i == 18 || i == 23) { 187 if (str[i] != '-') 188 return AE_BAD_PARAMETER; 189 } else if (!isxdigit(str[i])) 190 return AE_BAD_PARAMETER; 191 } 192 for (i = 0; i < 16; i++) { 193 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 194 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 195 } 196 return AE_OK; 197 } 198 199 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 200 { 201 acpi_status status; 202 struct acpi_object_list input; 203 union acpi_object in_params[4]; 204 union acpi_object *out_obj; 205 u8 uuid[16]; 206 u32 errors; 207 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 208 209 if (!context) 210 return AE_ERROR; 211 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 212 return AE_ERROR; 213 context->ret.length = ACPI_ALLOCATE_BUFFER; 214 context->ret.pointer = NULL; 215 216 /* Setting up input parameters */ 217 input.count = 4; 218 input.pointer = in_params; 219 in_params[0].type = ACPI_TYPE_BUFFER; 220 in_params[0].buffer.length = 16; 221 in_params[0].buffer.pointer = uuid; 222 in_params[1].type = ACPI_TYPE_INTEGER; 223 in_params[1].integer.value = context->rev; 224 in_params[2].type = ACPI_TYPE_INTEGER; 225 in_params[2].integer.value = context->cap.length/sizeof(u32); 226 in_params[3].type = ACPI_TYPE_BUFFER; 227 in_params[3].buffer.length = context->cap.length; 228 in_params[3].buffer.pointer = context->cap.pointer; 229 230 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 231 if (ACPI_FAILURE(status)) 232 return status; 233 234 if (!output.length) 235 return AE_NULL_OBJECT; 236 237 out_obj = output.pointer; 238 if (out_obj->type != ACPI_TYPE_BUFFER 239 || out_obj->buffer.length != context->cap.length) { 240 acpi_print_osc_error(handle, context, 241 "_OSC evaluation returned wrong type"); 242 status = AE_TYPE; 243 goto out_kfree; 244 } 245 /* Need to ignore the bit0 in result code */ 246 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 247 if (errors) { 248 if (errors & OSC_REQUEST_ERROR) 249 acpi_print_osc_error(handle, context, 250 "_OSC request failed"); 251 if (errors & OSC_INVALID_UUID_ERROR) 252 acpi_print_osc_error(handle, context, 253 "_OSC invalid UUID"); 254 if (errors & OSC_INVALID_REVISION_ERROR) 255 acpi_print_osc_error(handle, context, 256 "_OSC invalid revision"); 257 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 258 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 259 & OSC_QUERY_ENABLE) 260 goto out_success; 261 status = AE_SUPPORT; 262 goto out_kfree; 263 } 264 status = AE_ERROR; 265 goto out_kfree; 266 } 267 out_success: 268 context->ret.length = out_obj->buffer.length; 269 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 270 context->ret.length, GFP_KERNEL); 271 if (!context->ret.pointer) { 272 status = AE_NO_MEMORY; 273 goto out_kfree; 274 } 275 status = AE_OK; 276 277 out_kfree: 278 kfree(output.pointer); 279 if (status != AE_OK) 280 context->ret.pointer = NULL; 281 return status; 282 } 283 EXPORT_SYMBOL(acpi_run_osc); 284 285 bool osc_sb_apei_support_acked; 286 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 287 static void acpi_bus_osc_support(void) 288 { 289 u32 capbuf[2]; 290 struct acpi_osc_context context = { 291 .uuid_str = sb_uuid_str, 292 .rev = 1, 293 .cap.length = 8, 294 .cap.pointer = capbuf, 295 }; 296 acpi_handle handle; 297 298 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 299 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 300 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 301 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 302 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 303 #endif 304 305 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 306 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 307 #endif 308 309 #ifdef ACPI_HOTPLUG_OST 310 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT; 311 #endif 312 313 if (!ghes_disable) 314 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 315 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 316 return; 317 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 318 u32 *capbuf_ret = context.ret.pointer; 319 if (context.ret.length > OSC_SUPPORT_TYPE) 320 osc_sb_apei_support_acked = 321 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 322 kfree(context.ret.pointer); 323 } 324 /* do we need to check other returned cap? Sounds no */ 325 } 326 327 /* -------------------------------------------------------------------------- 328 Notification Handling 329 -------------------------------------------------------------------------- */ 330 331 static void acpi_bus_check_device(acpi_handle handle) 332 { 333 struct acpi_device *device; 334 acpi_status status; 335 struct acpi_device_status old_status; 336 337 if (acpi_bus_get_device(handle, &device)) 338 return; 339 if (!device) 340 return; 341 342 old_status = device->status; 343 344 /* 345 * Make sure this device's parent is present before we go about 346 * messing with the device. 347 */ 348 if (device->parent && !device->parent->status.present) { 349 device->status = device->parent->status; 350 return; 351 } 352 353 status = acpi_bus_get_status(device); 354 if (ACPI_FAILURE(status)) 355 return; 356 357 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 358 return; 359 360 /* 361 * Device Insertion/Removal 362 */ 363 if ((device->status.present) && !(old_status.present)) { 364 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 365 /* TBD: Handle device insertion */ 366 } else if (!(device->status.present) && (old_status.present)) { 367 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 368 /* TBD: Handle device removal */ 369 } 370 } 371 372 static void acpi_bus_check_scope(acpi_handle handle) 373 { 374 /* Status Change? */ 375 acpi_bus_check_device(handle); 376 377 /* 378 * TBD: Enumerate child devices within this device's scope and 379 * run acpi_bus_check_device()'s on them. 380 */ 381 } 382 383 /** 384 * acpi_bus_notify 385 * --------------- 386 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 387 */ 388 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 389 { 390 struct acpi_device *device = NULL; 391 struct acpi_driver *driver; 392 393 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 394 type, handle)); 395 396 switch (type) { 397 398 case ACPI_NOTIFY_BUS_CHECK: 399 acpi_bus_check_scope(handle); 400 /* 401 * TBD: We'll need to outsource certain events to non-ACPI 402 * drivers via the device manager (device.c). 403 */ 404 break; 405 406 case ACPI_NOTIFY_DEVICE_CHECK: 407 acpi_bus_check_device(handle); 408 /* 409 * TBD: We'll need to outsource certain events to non-ACPI 410 * drivers via the device manager (device.c). 411 */ 412 break; 413 414 case ACPI_NOTIFY_DEVICE_WAKE: 415 /* TBD */ 416 break; 417 418 case ACPI_NOTIFY_EJECT_REQUEST: 419 /* TBD */ 420 break; 421 422 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 423 /* TBD: Exactly what does 'light' mean? */ 424 break; 425 426 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 427 /* TBD */ 428 break; 429 430 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 431 /* TBD */ 432 break; 433 434 case ACPI_NOTIFY_POWER_FAULT: 435 /* TBD */ 436 break; 437 438 default: 439 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 440 "Received unknown/unsupported notification [%08x]\n", 441 type)); 442 break; 443 } 444 445 acpi_bus_get_device(handle, &device); 446 if (device) { 447 driver = device->driver; 448 if (driver && driver->ops.notify && 449 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 450 driver->ops.notify(device, type); 451 } 452 } 453 454 /* -------------------------------------------------------------------------- 455 Initialization/Cleanup 456 -------------------------------------------------------------------------- */ 457 458 static int __init acpi_bus_init_irq(void) 459 { 460 acpi_status status; 461 char *message = NULL; 462 463 464 /* 465 * Let the system know what interrupt model we are using by 466 * evaluating the \_PIC object, if exists. 467 */ 468 469 switch (acpi_irq_model) { 470 case ACPI_IRQ_MODEL_PIC: 471 message = "PIC"; 472 break; 473 case ACPI_IRQ_MODEL_IOAPIC: 474 message = "IOAPIC"; 475 break; 476 case ACPI_IRQ_MODEL_IOSAPIC: 477 message = "IOSAPIC"; 478 break; 479 case ACPI_IRQ_MODEL_PLATFORM: 480 message = "platform specific model"; 481 break; 482 default: 483 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 484 return -ENODEV; 485 } 486 487 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 488 489 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 490 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 491 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 492 return -ENODEV; 493 } 494 495 return 0; 496 } 497 498 u8 acpi_gbl_permanent_mmap; 499 500 501 void __init acpi_early_init(void) 502 { 503 acpi_status status; 504 505 if (acpi_disabled) 506 return; 507 508 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 509 510 /* enable workarounds, unless strict ACPI spec. compliance */ 511 if (!acpi_strict) 512 acpi_gbl_enable_interpreter_slack = TRUE; 513 514 acpi_gbl_permanent_mmap = 1; 515 516 /* 517 * If the machine falls into the DMI check table, 518 * DSDT will be copied to memory 519 */ 520 dmi_check_system(dsdt_dmi_table); 521 522 status = acpi_reallocate_root_table(); 523 if (ACPI_FAILURE(status)) { 524 printk(KERN_ERR PREFIX 525 "Unable to reallocate ACPI tables\n"); 526 goto error0; 527 } 528 529 status = acpi_initialize_subsystem(); 530 if (ACPI_FAILURE(status)) { 531 printk(KERN_ERR PREFIX 532 "Unable to initialize the ACPI Interpreter\n"); 533 goto error0; 534 } 535 536 status = acpi_load_tables(); 537 if (ACPI_FAILURE(status)) { 538 printk(KERN_ERR PREFIX 539 "Unable to load the System Description Tables\n"); 540 goto error0; 541 } 542 543 #ifdef CONFIG_X86 544 if (!acpi_ioapic) { 545 /* compatible (0) means level (3) */ 546 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 547 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 548 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 549 } 550 /* Set PIC-mode SCI trigger type */ 551 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 552 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 553 } else { 554 /* 555 * now that acpi_gbl_FADT is initialized, 556 * update it with result from INT_SRC_OVR parsing 557 */ 558 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 559 } 560 #endif 561 562 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 563 if (ACPI_FAILURE(status)) { 564 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 565 goto error0; 566 } 567 568 return; 569 570 error0: 571 disable_acpi(); 572 return; 573 } 574 575 static int __init acpi_bus_init(void) 576 { 577 int result; 578 acpi_status status; 579 580 acpi_os_initialize1(); 581 582 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 583 if (ACPI_FAILURE(status)) { 584 printk(KERN_ERR PREFIX 585 "Unable to start the ACPI Interpreter\n"); 586 goto error1; 587 } 588 589 /* 590 * ACPI 2.0 requires the EC driver to be loaded and work before 591 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 592 * is called). 593 * 594 * This is accomplished by looking for the ECDT table, and getting 595 * the EC parameters out of that. 596 */ 597 status = acpi_ec_ecdt_probe(); 598 /* Ignore result. Not having an ECDT is not fatal. */ 599 600 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 601 if (ACPI_FAILURE(status)) { 602 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 603 goto error1; 604 } 605 606 /* 607 * _OSC method may exist in module level code, 608 * so it must be run after ACPI_FULL_INITIALIZATION 609 */ 610 acpi_bus_osc_support(); 611 612 /* 613 * _PDC control method may load dynamic SSDT tables, 614 * and we need to install the table handler before that. 615 */ 616 acpi_sysfs_init(); 617 618 acpi_early_processor_set_pdc(); 619 620 /* 621 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 622 * is necessary to enable it as early as possible. 623 */ 624 acpi_boot_ec_enable(); 625 626 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 627 628 /* Initialize sleep structures */ 629 acpi_sleep_init(); 630 631 /* 632 * Get the system interrupt model and evaluate \_PIC. 633 */ 634 result = acpi_bus_init_irq(); 635 if (result) 636 goto error1; 637 638 /* 639 * Register the for all standard device notifications. 640 */ 641 status = 642 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 643 &acpi_bus_notify, NULL); 644 if (ACPI_FAILURE(status)) { 645 printk(KERN_ERR PREFIX 646 "Unable to register for device notifications\n"); 647 goto error1; 648 } 649 650 /* 651 * Create the top ACPI proc directory 652 */ 653 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 654 655 return 0; 656 657 /* Mimic structured exception handling */ 658 error1: 659 acpi_terminate(); 660 return -ENODEV; 661 } 662 663 struct kobject *acpi_kobj; 664 EXPORT_SYMBOL_GPL(acpi_kobj); 665 666 static int __init acpi_init(void) 667 { 668 int result; 669 670 if (acpi_disabled) { 671 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 672 return -ENODEV; 673 } 674 675 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 676 if (!acpi_kobj) { 677 printk(KERN_WARNING "%s: kset create error\n", __func__); 678 acpi_kobj = NULL; 679 } 680 681 init_acpi_device_notify(); 682 result = acpi_bus_init(); 683 if (result) { 684 disable_acpi(); 685 return result; 686 } 687 688 pci_mmcfg_late_init(); 689 acpi_scan_init(); 690 acpi_ec_init(); 691 acpi_debugfs_init(); 692 acpi_sleep_proc_init(); 693 acpi_wakeup_device_init(); 694 return 0; 695 } 696 697 subsys_initcall(acpi_init); 698