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