1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) 4 * 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 */ 7 8 #define pr_fmt(fmt) "ACPI: " fmt 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/ioport.h> 13 #include <linux/kernel.h> 14 #include <linux/list.h> 15 #include <linux/sched.h> 16 #include <linux/pm.h> 17 #include <linux/device.h> 18 #include <linux/proc_fs.h> 19 #include <linux/acpi.h> 20 #include <linux/slab.h> 21 #include <linux/regulator/machine.h> 22 #include <linux/workqueue.h> 23 #include <linux/reboot.h> 24 #include <linux/delay.h> 25 #ifdef CONFIG_X86 26 #include <asm/mpspec.h> 27 #include <linux/dmi.h> 28 #endif 29 #include <linux/acpi_agdi.h> 30 #include <linux/acpi_iort.h> 31 #include <linux/acpi_viot.h> 32 #include <linux/pci.h> 33 #include <acpi/apei.h> 34 #include <linux/suspend.h> 35 #include <linux/prmt.h> 36 37 #include "internal.h" 38 39 struct acpi_device *acpi_root; 40 struct proc_dir_entry *acpi_root_dir; 41 EXPORT_SYMBOL(acpi_root_dir); 42 43 #ifdef CONFIG_X86 44 #ifdef CONFIG_ACPI_CUSTOM_DSDT 45 static inline int set_copy_dsdt(const struct dmi_system_id *id) 46 { 47 return 0; 48 } 49 #else 50 static int set_copy_dsdt(const struct dmi_system_id *id) 51 { 52 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident); 53 acpi_gbl_copy_dsdt_locally = 1; 54 return 0; 55 } 56 #endif 57 58 static const struct dmi_system_id dsdt_dmi_table[] __initconst = { 59 /* 60 * Invoke DSDT corruption work-around on all Toshiba Satellite. 61 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 62 */ 63 { 64 .callback = set_copy_dsdt, 65 .ident = "TOSHIBA Satellite", 66 .matches = { 67 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 68 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 69 }, 70 }, 71 {} 72 }; 73 #endif 74 75 /* -------------------------------------------------------------------------- 76 Device Management 77 -------------------------------------------------------------------------- */ 78 79 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 80 unsigned long long *sta) 81 { 82 acpi_status status; 83 84 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 85 if (ACPI_SUCCESS(status)) 86 return AE_OK; 87 88 if (status == AE_NOT_FOUND) { 89 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 90 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 91 return AE_OK; 92 } 93 return status; 94 } 95 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); 96 97 int acpi_bus_get_status(struct acpi_device *device) 98 { 99 acpi_status status; 100 unsigned long long sta; 101 102 if (acpi_device_override_status(device, &sta)) { 103 acpi_set_device_status(device, sta); 104 return 0; 105 } 106 107 /* Battery devices must have their deps met before calling _STA */ 108 if (acpi_device_is_battery(device) && device->dep_unmet) { 109 acpi_set_device_status(device, 0); 110 return 0; 111 } 112 113 status = acpi_bus_get_status_handle(device->handle, &sta); 114 if (ACPI_FAILURE(status)) 115 return -ENODEV; 116 117 acpi_set_device_status(device, sta); 118 119 if (device->status.functional && !device->status.present) { 120 pr_debug("Device [%s] status [%08x]: functional but not present\n", 121 device->pnp.bus_id, (u32)sta); 122 } 123 124 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta); 125 return 0; 126 } 127 EXPORT_SYMBOL(acpi_bus_get_status); 128 129 void acpi_bus_private_data_handler(acpi_handle handle, 130 void *context) 131 { 132 return; 133 } 134 EXPORT_SYMBOL(acpi_bus_private_data_handler); 135 136 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 137 { 138 acpi_status status; 139 140 status = acpi_attach_data(handle, 141 acpi_bus_private_data_handler, data); 142 if (ACPI_FAILURE(status)) { 143 acpi_handle_debug(handle, "Error attaching device data\n"); 144 return -ENODEV; 145 } 146 147 return 0; 148 } 149 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 150 151 int acpi_bus_get_private_data(acpi_handle handle, void **data) 152 { 153 acpi_status status; 154 155 if (!data) 156 return -EINVAL; 157 158 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 159 if (ACPI_FAILURE(status)) { 160 acpi_handle_debug(handle, "No context for object\n"); 161 return -ENODEV; 162 } 163 164 return 0; 165 } 166 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 167 168 void acpi_bus_detach_private_data(acpi_handle handle) 169 { 170 acpi_detach_data(handle, acpi_bus_private_data_handler); 171 } 172 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 173 174 static void acpi_print_osc_error(acpi_handle handle, 175 struct acpi_osc_context *context, char *error) 176 { 177 int i; 178 179 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); 180 181 pr_debug("_OSC request data:"); 182 for (i = 0; i < context->cap.length; i += sizeof(u32)) 183 pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); 184 185 pr_debug("\n"); 186 } 187 188 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 189 { 190 acpi_status status; 191 struct acpi_object_list input; 192 union acpi_object in_params[4]; 193 union acpi_object *out_obj; 194 guid_t guid; 195 u32 errors; 196 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 197 198 if (!context) 199 return AE_ERROR; 200 if (guid_parse(context->uuid_str, &guid)) 201 return AE_ERROR; 202 context->ret.length = ACPI_ALLOCATE_BUFFER; 203 context->ret.pointer = NULL; 204 205 /* Setting up input parameters */ 206 input.count = 4; 207 input.pointer = in_params; 208 in_params[0].type = ACPI_TYPE_BUFFER; 209 in_params[0].buffer.length = 16; 210 in_params[0].buffer.pointer = (u8 *)&guid; 211 in_params[1].type = ACPI_TYPE_INTEGER; 212 in_params[1].integer.value = context->rev; 213 in_params[2].type = ACPI_TYPE_INTEGER; 214 in_params[2].integer.value = context->cap.length/sizeof(u32); 215 in_params[3].type = ACPI_TYPE_BUFFER; 216 in_params[3].buffer.length = context->cap.length; 217 in_params[3].buffer.pointer = context->cap.pointer; 218 219 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 220 if (ACPI_FAILURE(status)) 221 return status; 222 223 if (!output.length) 224 return AE_NULL_OBJECT; 225 226 out_obj = output.pointer; 227 if (out_obj->type != ACPI_TYPE_BUFFER 228 || out_obj->buffer.length != context->cap.length) { 229 acpi_print_osc_error(handle, context, 230 "_OSC evaluation returned wrong type"); 231 status = AE_TYPE; 232 goto out_kfree; 233 } 234 /* Need to ignore the bit0 in result code */ 235 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 236 if (errors) { 237 if (errors & OSC_REQUEST_ERROR) 238 acpi_print_osc_error(handle, context, 239 "_OSC request failed"); 240 if (errors & OSC_INVALID_UUID_ERROR) 241 acpi_print_osc_error(handle, context, 242 "_OSC invalid UUID"); 243 if (errors & OSC_INVALID_REVISION_ERROR) 244 acpi_print_osc_error(handle, context, 245 "_OSC invalid revision"); 246 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 247 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 248 & OSC_QUERY_ENABLE) 249 goto out_success; 250 status = AE_SUPPORT; 251 goto out_kfree; 252 } 253 status = AE_ERROR; 254 goto out_kfree; 255 } 256 out_success: 257 context->ret.length = out_obj->buffer.length; 258 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 259 context->ret.length, GFP_KERNEL); 260 if (!context->ret.pointer) { 261 status = AE_NO_MEMORY; 262 goto out_kfree; 263 } 264 status = AE_OK; 265 266 out_kfree: 267 kfree(output.pointer); 268 return status; 269 } 270 EXPORT_SYMBOL(acpi_run_osc); 271 272 bool osc_sb_apei_support_acked; 273 274 /* 275 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 276 * OSPM supports platform coordinated low power idle(LPI) states 277 */ 278 bool osc_pc_lpi_support_confirmed; 279 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 280 281 /* 282 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': 283 * Starting with ACPI Specification 6.2, all _CPC registers can be in 284 * PCC, System Memory, System IO, or Functional Fixed Hardware address 285 * spaces. OSPM support for this more flexible register space scheme is 286 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. 287 * 288 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: 289 * - PCC or Functional Fixed Hardware address space if defined 290 * - SystemMemory address space (NULL register) if not defined 291 */ 292 bool osc_cpc_flexible_adr_space_confirmed; 293 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); 294 295 /* 296 * ACPI 6.4 Operating System Capabilities for USB. 297 */ 298 bool osc_sb_native_usb4_support_confirmed; 299 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); 300 301 bool osc_sb_cppc2_support_acked; 302 303 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 304 static void acpi_bus_osc_negotiate_platform_control(void) 305 { 306 u32 capbuf[2], *capbuf_ret; 307 struct acpi_osc_context context = { 308 .uuid_str = sb_uuid_str, 309 .rev = 1, 310 .cap.length = 8, 311 .cap.pointer = capbuf, 312 }; 313 acpi_handle handle; 314 315 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 316 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 317 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 319 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 321 322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; 324 if (IS_ENABLED(CONFIG_ACPI_PRMT)) 325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT; 326 327 #ifdef CONFIG_ARM64 328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 329 #endif 330 #ifdef CONFIG_X86 331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 332 #endif 333 334 #ifdef CONFIG_ACPI_CPPC_LIB 335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; 336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; 337 #endif 338 339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 340 341 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 343 344 if (IS_ENABLED(CONFIG_USB4)) 345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT; 346 347 if (!ghes_disable) 348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 349 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 350 return; 351 352 if (ACPI_FAILURE(acpi_run_osc(handle, &context))) 353 return; 354 355 capbuf_ret = context.ret.pointer; 356 if (context.ret.length <= OSC_SUPPORT_DWORD) { 357 kfree(context.ret.pointer); 358 return; 359 } 360 361 /* 362 * Now run _OSC again with query flag clear and with the caps 363 * supported by both the OS and the platform. 364 */ 365 capbuf[OSC_QUERY_DWORD] = 0; 366 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; 367 kfree(context.ret.pointer); 368 369 if (ACPI_FAILURE(acpi_run_osc(handle, &context))) 370 return; 371 372 capbuf_ret = context.ret.pointer; 373 if (context.ret.length > OSC_SUPPORT_DWORD) { 374 #ifdef CONFIG_ACPI_CPPC_LIB 375 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT; 376 #endif 377 378 osc_sb_apei_support_acked = 379 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 380 osc_pc_lpi_support_confirmed = 381 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 382 osc_sb_native_usb4_support_confirmed = 383 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; 384 osc_cpc_flexible_adr_space_confirmed = 385 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 386 } 387 388 kfree(context.ret.pointer); 389 } 390 391 /* 392 * Native control of USB4 capabilities. If any of the tunneling bits is 393 * set it means OS is in control and we use software based connection 394 * manager. 395 */ 396 u32 osc_sb_native_usb4_control; 397 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); 398 399 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) 400 { 401 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, 402 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', 403 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', 404 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', 405 (bits & OSC_USB_XDOMAIN) ? '+' : '-'); 406 } 407 408 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; 409 static void acpi_bus_osc_negotiate_usb_control(void) 410 { 411 u32 capbuf[3]; 412 struct acpi_osc_context context = { 413 .uuid_str = sb_usb_uuid_str, 414 .rev = 1, 415 .cap.length = sizeof(capbuf), 416 .cap.pointer = capbuf, 417 }; 418 acpi_handle handle; 419 acpi_status status; 420 u32 control; 421 422 if (!osc_sb_native_usb4_support_confirmed) 423 return; 424 425 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 426 return; 427 428 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | 429 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; 430 431 capbuf[OSC_QUERY_DWORD] = 0; 432 capbuf[OSC_SUPPORT_DWORD] = 0; 433 capbuf[OSC_CONTROL_DWORD] = control; 434 435 status = acpi_run_osc(handle, &context); 436 if (ACPI_FAILURE(status)) 437 return; 438 439 if (context.ret.length != sizeof(capbuf)) { 440 pr_info("USB4 _OSC: returned invalid length buffer\n"); 441 goto out_free; 442 } 443 444 osc_sb_native_usb4_control = 445 control & acpi_osc_ctx_get_pci_control(&context); 446 447 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 448 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", 449 osc_sb_native_usb4_control); 450 451 out_free: 452 kfree(context.ret.pointer); 453 } 454 455 /* -------------------------------------------------------------------------- 456 Notification Handling 457 -------------------------------------------------------------------------- */ 458 459 /** 460 * acpi_bus_notify 461 * --------------- 462 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 463 */ 464 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 465 { 466 struct acpi_device *adev; 467 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 468 bool hotplug_event = false; 469 470 switch (type) { 471 case ACPI_NOTIFY_BUS_CHECK: 472 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 473 hotplug_event = true; 474 break; 475 476 case ACPI_NOTIFY_DEVICE_CHECK: 477 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 478 hotplug_event = true; 479 break; 480 481 case ACPI_NOTIFY_DEVICE_WAKE: 482 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 483 break; 484 485 case ACPI_NOTIFY_EJECT_REQUEST: 486 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 487 hotplug_event = true; 488 break; 489 490 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 491 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 492 /* TBD: Exactly what does 'light' mean? */ 493 break; 494 495 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 496 acpi_handle_err(handle, "Device cannot be configured due " 497 "to a frequency mismatch\n"); 498 break; 499 500 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 501 acpi_handle_err(handle, "Device cannot be configured due " 502 "to a bus mode mismatch\n"); 503 break; 504 505 case ACPI_NOTIFY_POWER_FAULT: 506 acpi_handle_err(handle, "Device has suffered a power fault\n"); 507 break; 508 509 default: 510 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 511 break; 512 } 513 514 adev = acpi_bus_get_acpi_device(handle); 515 if (!adev) 516 goto err; 517 518 if (adev->dev.driver) { 519 struct acpi_driver *driver = to_acpi_driver(adev->dev.driver); 520 521 if (driver && driver->ops.notify && 522 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 523 driver->ops.notify(adev, type); 524 } 525 526 if (!hotplug_event) { 527 acpi_bus_put_acpi_device(adev); 528 return; 529 } 530 531 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 532 return; 533 534 acpi_bus_put_acpi_device(adev); 535 536 err: 537 acpi_evaluate_ost(handle, type, ost_code, NULL); 538 } 539 540 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 541 { 542 struct acpi_device *device = data; 543 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); 544 545 acpi_drv->ops.notify(device, event); 546 } 547 548 static void acpi_notify_device_fixed(void *data) 549 { 550 struct acpi_device *device = data; 551 552 /* Fixed hardware devices have no handles */ 553 acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 554 } 555 556 static u32 acpi_device_fixed_event(void *data) 557 { 558 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data); 559 return ACPI_INTERRUPT_HANDLED; 560 } 561 562 static int acpi_device_install_notify_handler(struct acpi_device *device) 563 { 564 acpi_status status; 565 566 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 567 status = 568 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 569 acpi_device_fixed_event, 570 device); 571 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 572 status = 573 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 574 acpi_device_fixed_event, 575 device); 576 else 577 status = acpi_install_notify_handler(device->handle, 578 ACPI_DEVICE_NOTIFY, 579 acpi_notify_device, 580 device); 581 582 if (ACPI_FAILURE(status)) 583 return -EINVAL; 584 return 0; 585 } 586 587 static void acpi_device_remove_notify_handler(struct acpi_device *device) 588 { 589 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 590 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 591 acpi_device_fixed_event); 592 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 593 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 594 acpi_device_fixed_event); 595 else 596 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 597 acpi_notify_device); 598 } 599 600 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 601 602 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 603 #define ACPI_SB_INDICATE_INTERVAL 10000 604 605 static void sb_notify_work(struct work_struct *dummy) 606 { 607 acpi_handle sb_handle; 608 609 orderly_poweroff(true); 610 611 /* 612 * After initiating graceful shutdown, the ACPI spec requires OSPM 613 * to evaluate _OST method once every 10seconds to indicate that 614 * the shutdown is in progress 615 */ 616 acpi_get_handle(NULL, "\\_SB", &sb_handle); 617 while (1) { 618 pr_info("Graceful shutdown in progress.\n"); 619 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 620 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 621 msleep(ACPI_SB_INDICATE_INTERVAL); 622 } 623 } 624 625 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 626 { 627 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 628 629 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 630 if (!work_busy(&acpi_sb_work)) 631 schedule_work(&acpi_sb_work); 632 } else 633 pr_warn("event %x is not supported by \\_SB device\n", event); 634 } 635 636 static int __init acpi_setup_sb_notify_handler(void) 637 { 638 acpi_handle sb_handle; 639 640 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 641 return -ENXIO; 642 643 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 644 acpi_sb_notify, NULL))) 645 return -EINVAL; 646 647 return 0; 648 } 649 650 /* -------------------------------------------------------------------------- 651 Device Matching 652 -------------------------------------------------------------------------- */ 653 654 /** 655 * acpi_get_first_physical_node - Get first physical node of an ACPI device 656 * @adev: ACPI device in question 657 * 658 * Return: First physical node of ACPI device @adev 659 */ 660 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 661 { 662 struct mutex *physical_node_lock = &adev->physical_node_lock; 663 struct device *phys_dev; 664 665 mutex_lock(physical_node_lock); 666 if (list_empty(&adev->physical_node_list)) { 667 phys_dev = NULL; 668 } else { 669 const struct acpi_device_physical_node *node; 670 671 node = list_first_entry(&adev->physical_node_list, 672 struct acpi_device_physical_node, node); 673 674 phys_dev = node->dev; 675 } 676 mutex_unlock(physical_node_lock); 677 return phys_dev; 678 } 679 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 680 681 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 682 const struct device *dev) 683 { 684 const struct device *phys_dev = acpi_get_first_physical_node(adev); 685 686 return phys_dev && phys_dev == dev ? adev : NULL; 687 } 688 689 /** 690 * acpi_device_is_first_physical_node - Is given dev first physical node 691 * @adev: ACPI companion device 692 * @dev: Physical device to check 693 * 694 * Function checks if given @dev is the first physical devices attached to 695 * the ACPI companion device. This distinction is needed in some cases 696 * where the same companion device is shared between many physical devices. 697 * 698 * Note that the caller have to provide valid @adev pointer. 699 */ 700 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 701 const struct device *dev) 702 { 703 return !!acpi_primary_dev_companion(adev, dev); 704 } 705 706 /* 707 * acpi_companion_match() - Can we match via ACPI companion device 708 * @dev: Device in question 709 * 710 * Check if the given device has an ACPI companion and if that companion has 711 * a valid list of PNP IDs, and if the device is the first (primary) physical 712 * device associated with it. Return the companion pointer if that's the case 713 * or NULL otherwise. 714 * 715 * If multiple physical devices are attached to a single ACPI companion, we need 716 * to be careful. The usage scenario for this kind of relationship is that all 717 * of the physical devices in question use resources provided by the ACPI 718 * companion. A typical case is an MFD device where all the sub-devices share 719 * the parent's ACPI companion. In such cases we can only allow the primary 720 * (first) physical device to be matched with the help of the companion's PNP 721 * IDs. 722 * 723 * Additional physical devices sharing the ACPI companion can still use 724 * resources available from it but they will be matched normally using functions 725 * provided by their bus types (and analogously for their modalias). 726 */ 727 struct acpi_device *acpi_companion_match(const struct device *dev) 728 { 729 struct acpi_device *adev; 730 731 adev = ACPI_COMPANION(dev); 732 if (!adev) 733 return NULL; 734 735 if (list_empty(&adev->pnp.ids)) 736 return NULL; 737 738 return acpi_primary_dev_companion(adev, dev); 739 } 740 741 /** 742 * acpi_of_match_device - Match device object using the "compatible" property. 743 * @adev: ACPI device object to match. 744 * @of_match_table: List of device IDs to match against. 745 * @of_id: OF ID if matched 746 * 747 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 748 * identifiers and a _DSD object with the "compatible" property, use that 749 * property to match against the given list of identifiers. 750 */ 751 static bool acpi_of_match_device(struct acpi_device *adev, 752 const struct of_device_id *of_match_table, 753 const struct of_device_id **of_id) 754 { 755 const union acpi_object *of_compatible, *obj; 756 int i, nval; 757 758 if (!adev) 759 return false; 760 761 of_compatible = adev->data.of_compatible; 762 if (!of_match_table || !of_compatible) 763 return false; 764 765 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 766 nval = of_compatible->package.count; 767 obj = of_compatible->package.elements; 768 } else { /* Must be ACPI_TYPE_STRING. */ 769 nval = 1; 770 obj = of_compatible; 771 } 772 /* Now we can look for the driver DT compatible strings */ 773 for (i = 0; i < nval; i++, obj++) { 774 const struct of_device_id *id; 775 776 for (id = of_match_table; id->compatible[0]; id++) 777 if (!strcasecmp(obj->string.pointer, id->compatible)) { 778 if (of_id) 779 *of_id = id; 780 return true; 781 } 782 } 783 784 return false; 785 } 786 787 static bool acpi_of_modalias(struct acpi_device *adev, 788 char *modalias, size_t len) 789 { 790 const union acpi_object *of_compatible; 791 const union acpi_object *obj; 792 const char *str, *chr; 793 794 of_compatible = adev->data.of_compatible; 795 if (!of_compatible) 796 return false; 797 798 if (of_compatible->type == ACPI_TYPE_PACKAGE) 799 obj = of_compatible->package.elements; 800 else /* Must be ACPI_TYPE_STRING. */ 801 obj = of_compatible; 802 803 str = obj->string.pointer; 804 chr = strchr(str, ','); 805 strlcpy(modalias, chr ? chr + 1 : str, len); 806 807 return true; 808 } 809 810 /** 811 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 812 * @adev: ACPI device object to match 813 * @default_id: ID string to use as default if no compatible string found 814 * @modalias: Pointer to buffer that modalias value will be copied into 815 * @len: Length of modalias buffer 816 * 817 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 818 * If there is a compatible string for @adev, it will be copied to @modalias 819 * with the vendor prefix stripped; otherwise, @default_id will be used. 820 */ 821 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 822 char *modalias, size_t len) 823 { 824 if (!acpi_of_modalias(adev, modalias, len)) 825 strlcpy(modalias, default_id, len); 826 } 827 EXPORT_SYMBOL_GPL(acpi_set_modalias); 828 829 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 830 struct acpi_hardware_id *hwid) 831 { 832 int i, msk, byte_shift; 833 char buf[3]; 834 835 if (!id->cls) 836 return false; 837 838 /* Apply class-code bitmask, before checking each class-code byte */ 839 for (i = 1; i <= 3; i++) { 840 byte_shift = 8 * (3 - i); 841 msk = (id->cls_msk >> byte_shift) & 0xFF; 842 if (!msk) 843 continue; 844 845 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 846 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 847 return false; 848 } 849 return true; 850 } 851 852 static bool __acpi_match_device(struct acpi_device *device, 853 const struct acpi_device_id *acpi_ids, 854 const struct of_device_id *of_ids, 855 const struct acpi_device_id **acpi_id, 856 const struct of_device_id **of_id) 857 { 858 const struct acpi_device_id *id; 859 struct acpi_hardware_id *hwid; 860 861 /* 862 * If the device is not present, it is unnecessary to load device 863 * driver for it. 864 */ 865 if (!device || !device->status.present) 866 return false; 867 868 list_for_each_entry(hwid, &device->pnp.ids, list) { 869 /* First, check the ACPI/PNP IDs provided by the caller. */ 870 if (acpi_ids) { 871 for (id = acpi_ids; id->id[0] || id->cls; id++) { 872 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 873 goto out_acpi_match; 874 if (id->cls && __acpi_match_device_cls(id, hwid)) 875 goto out_acpi_match; 876 } 877 } 878 879 /* 880 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 881 * "compatible" property if found. 882 */ 883 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 884 return acpi_of_match_device(device, of_ids, of_id); 885 } 886 return false; 887 888 out_acpi_match: 889 if (acpi_id) 890 *acpi_id = id; 891 return true; 892 } 893 894 /** 895 * acpi_match_device - Match a struct device against a given list of ACPI IDs 896 * @ids: Array of struct acpi_device_id object to match against. 897 * @dev: The device structure to match. 898 * 899 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 900 * object for that handle and use that object to match against a given list of 901 * device IDs. 902 * 903 * Return a pointer to the first matching ID on success or %NULL on failure. 904 */ 905 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 906 const struct device *dev) 907 { 908 const struct acpi_device_id *id = NULL; 909 910 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 911 return id; 912 } 913 EXPORT_SYMBOL_GPL(acpi_match_device); 914 915 static const void *acpi_of_device_get_match_data(const struct device *dev) 916 { 917 struct acpi_device *adev = ACPI_COMPANION(dev); 918 const struct of_device_id *match = NULL; 919 920 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 921 return NULL; 922 923 return match->data; 924 } 925 926 const void *acpi_device_get_match_data(const struct device *dev) 927 { 928 const struct acpi_device_id *match; 929 930 if (!dev->driver->acpi_match_table) 931 return acpi_of_device_get_match_data(dev); 932 933 match = acpi_match_device(dev->driver->acpi_match_table, dev); 934 if (!match) 935 return NULL; 936 937 return (const void *)match->driver_data; 938 } 939 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 940 941 int acpi_match_device_ids(struct acpi_device *device, 942 const struct acpi_device_id *ids) 943 { 944 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 945 } 946 EXPORT_SYMBOL(acpi_match_device_ids); 947 948 bool acpi_driver_match_device(struct device *dev, 949 const struct device_driver *drv) 950 { 951 if (!drv->acpi_match_table) 952 return acpi_of_match_device(ACPI_COMPANION(dev), 953 drv->of_match_table, 954 NULL); 955 956 return __acpi_match_device(acpi_companion_match(dev), 957 drv->acpi_match_table, drv->of_match_table, 958 NULL, NULL); 959 } 960 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 961 962 /* -------------------------------------------------------------------------- 963 ACPI Driver Management 964 -------------------------------------------------------------------------- */ 965 966 /** 967 * acpi_bus_register_driver - register a driver with the ACPI bus 968 * @driver: driver being registered 969 * 970 * Registers a driver with the ACPI bus. Searches the namespace for all 971 * devices that match the driver's criteria and binds. Returns zero for 972 * success or a negative error status for failure. 973 */ 974 int acpi_bus_register_driver(struct acpi_driver *driver) 975 { 976 int ret; 977 978 if (acpi_disabled) 979 return -ENODEV; 980 driver->drv.name = driver->name; 981 driver->drv.bus = &acpi_bus_type; 982 driver->drv.owner = driver->owner; 983 984 ret = driver_register(&driver->drv); 985 return ret; 986 } 987 988 EXPORT_SYMBOL(acpi_bus_register_driver); 989 990 /** 991 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 992 * @driver: driver to unregister 993 * 994 * Unregisters a driver with the ACPI bus. Searches the namespace for all 995 * devices that match the driver's criteria and unbinds. 996 */ 997 void acpi_bus_unregister_driver(struct acpi_driver *driver) 998 { 999 driver_unregister(&driver->drv); 1000 } 1001 1002 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1003 1004 /* -------------------------------------------------------------------------- 1005 ACPI Bus operations 1006 -------------------------------------------------------------------------- */ 1007 1008 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 1009 { 1010 struct acpi_device *acpi_dev = to_acpi_device(dev); 1011 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1012 1013 return acpi_dev->flags.match_driver 1014 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1015 } 1016 1017 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 1018 { 1019 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1020 } 1021 1022 static int acpi_device_probe(struct device *dev) 1023 { 1024 struct acpi_device *acpi_dev = to_acpi_device(dev); 1025 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1026 int ret; 1027 1028 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1029 return -EINVAL; 1030 1031 if (!acpi_drv->ops.add) 1032 return -ENOSYS; 1033 1034 ret = acpi_drv->ops.add(acpi_dev); 1035 if (ret) 1036 return ret; 1037 1038 pr_debug("Driver [%s] successfully bound to device [%s]\n", 1039 acpi_drv->name, acpi_dev->pnp.bus_id); 1040 1041 if (acpi_drv->ops.notify) { 1042 ret = acpi_device_install_notify_handler(acpi_dev); 1043 if (ret) { 1044 if (acpi_drv->ops.remove) 1045 acpi_drv->ops.remove(acpi_dev); 1046 1047 acpi_dev->driver_data = NULL; 1048 return ret; 1049 } 1050 } 1051 1052 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, 1053 acpi_dev->pnp.bus_id); 1054 1055 get_device(dev); 1056 return 0; 1057 } 1058 1059 static void acpi_device_remove(struct device *dev) 1060 { 1061 struct acpi_device *acpi_dev = to_acpi_device(dev); 1062 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1063 1064 if (acpi_drv->ops.notify) 1065 acpi_device_remove_notify_handler(acpi_dev); 1066 1067 if (acpi_drv->ops.remove) 1068 acpi_drv->ops.remove(acpi_dev); 1069 1070 acpi_dev->driver_data = NULL; 1071 1072 put_device(dev); 1073 } 1074 1075 struct bus_type acpi_bus_type = { 1076 .name = "acpi", 1077 .match = acpi_bus_match, 1078 .probe = acpi_device_probe, 1079 .remove = acpi_device_remove, 1080 .uevent = acpi_device_uevent, 1081 }; 1082 1083 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1084 { 1085 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1086 } 1087 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1088 1089 struct acpi_dev_walk_context { 1090 int (*fn)(struct acpi_device *, void *); 1091 void *data; 1092 }; 1093 1094 static int acpi_dev_for_one_check(struct device *dev, void *context) 1095 { 1096 struct acpi_dev_walk_context *adwc = context; 1097 1098 if (dev->bus != &acpi_bus_type) 1099 return 0; 1100 1101 return adwc->fn(to_acpi_device(dev), adwc->data); 1102 } 1103 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); 1104 1105 int acpi_dev_for_each_child(struct acpi_device *adev, 1106 int (*fn)(struct acpi_device *, void *), void *data) 1107 { 1108 struct acpi_dev_walk_context adwc = { 1109 .fn = fn, 1110 .data = data, 1111 }; 1112 1113 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1114 } 1115 1116 int acpi_dev_for_each_child_reverse(struct acpi_device *adev, 1117 int (*fn)(struct acpi_device *, void *), 1118 void *data) 1119 { 1120 struct acpi_dev_walk_context adwc = { 1121 .fn = fn, 1122 .data = data, 1123 }; 1124 1125 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); 1126 } 1127 1128 /* -------------------------------------------------------------------------- 1129 Initialization/Cleanup 1130 -------------------------------------------------------------------------- */ 1131 1132 static int __init acpi_bus_init_irq(void) 1133 { 1134 acpi_status status; 1135 char *message = NULL; 1136 1137 1138 /* 1139 * Let the system know what interrupt model we are using by 1140 * evaluating the \_PIC object, if exists. 1141 */ 1142 1143 switch (acpi_irq_model) { 1144 case ACPI_IRQ_MODEL_PIC: 1145 message = "PIC"; 1146 break; 1147 case ACPI_IRQ_MODEL_IOAPIC: 1148 message = "IOAPIC"; 1149 break; 1150 case ACPI_IRQ_MODEL_IOSAPIC: 1151 message = "IOSAPIC"; 1152 break; 1153 case ACPI_IRQ_MODEL_GIC: 1154 message = "GIC"; 1155 break; 1156 case ACPI_IRQ_MODEL_PLATFORM: 1157 message = "platform specific model"; 1158 break; 1159 case ACPI_IRQ_MODEL_LPIC: 1160 message = "LPIC"; 1161 break; 1162 default: 1163 pr_info("Unknown interrupt routing model\n"); 1164 return -ENODEV; 1165 } 1166 1167 pr_info("Using %s for interrupt routing\n", message); 1168 1169 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1170 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1171 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1172 return -ENODEV; 1173 } 1174 1175 return 0; 1176 } 1177 1178 /** 1179 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1180 * 1181 * The ACPI tables are accessible after this, but the handling of events has not 1182 * been initialized and the global lock is not available yet, so AML should not 1183 * be executed at this point. 1184 * 1185 * Doing this before switching the EFI runtime services to virtual mode allows 1186 * the EfiBootServices memory to be freed slightly earlier on boot. 1187 */ 1188 void __init acpi_early_init(void) 1189 { 1190 acpi_status status; 1191 1192 if (acpi_disabled) 1193 return; 1194 1195 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1196 1197 /* enable workarounds, unless strict ACPI spec. compliance */ 1198 if (!acpi_strict) 1199 acpi_gbl_enable_interpreter_slack = TRUE; 1200 1201 acpi_permanent_mmap = true; 1202 1203 #ifdef CONFIG_X86 1204 /* 1205 * If the machine falls into the DMI check table, 1206 * DSDT will be copied to memory. 1207 * Note that calling dmi_check_system() here on other architectures 1208 * would not be OK because only x86 initializes dmi early enough. 1209 * Thankfully only x86 systems need such quirks for now. 1210 */ 1211 dmi_check_system(dsdt_dmi_table); 1212 #endif 1213 1214 status = acpi_reallocate_root_table(); 1215 if (ACPI_FAILURE(status)) { 1216 pr_err("Unable to reallocate ACPI tables\n"); 1217 goto error0; 1218 } 1219 1220 status = acpi_initialize_subsystem(); 1221 if (ACPI_FAILURE(status)) { 1222 pr_err("Unable to initialize the ACPI Interpreter\n"); 1223 goto error0; 1224 } 1225 1226 #ifdef CONFIG_X86 1227 if (!acpi_ioapic) { 1228 /* compatible (0) means level (3) */ 1229 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1230 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1231 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1232 } 1233 /* Set PIC-mode SCI trigger type */ 1234 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1235 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1236 } else { 1237 /* 1238 * now that acpi_gbl_FADT is initialized, 1239 * update it with result from INT_SRC_OVR parsing 1240 */ 1241 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1242 } 1243 #endif 1244 return; 1245 1246 error0: 1247 disable_acpi(); 1248 } 1249 1250 /** 1251 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1252 * 1253 * Switch over the platform to the ACPI mode (if possible). 1254 * 1255 * Doing this too early is generally unsafe, but at the same time it needs to be 1256 * done before all things that really depend on ACPI. The right spot appears to 1257 * be before finalizing the EFI initialization. 1258 */ 1259 void __init acpi_subsystem_init(void) 1260 { 1261 acpi_status status; 1262 1263 if (acpi_disabled) 1264 return; 1265 1266 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1267 if (ACPI_FAILURE(status)) { 1268 pr_err("Unable to enable ACPI\n"); 1269 disable_acpi(); 1270 } else { 1271 /* 1272 * If the system is using ACPI then we can be reasonably 1273 * confident that any regulators are managed by the firmware 1274 * so tell the regulator core it has everything it needs to 1275 * know. 1276 */ 1277 regulator_has_full_constraints(); 1278 } 1279 } 1280 1281 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1282 { 1283 if (event == ACPI_TABLE_EVENT_LOAD) 1284 acpi_scan_table_notify(); 1285 1286 return acpi_sysfs_table_handler(event, table, context); 1287 } 1288 1289 static int __init acpi_bus_init(void) 1290 { 1291 int result; 1292 acpi_status status; 1293 1294 acpi_os_initialize1(); 1295 1296 status = acpi_load_tables(); 1297 if (ACPI_FAILURE(status)) { 1298 pr_err("Unable to load the System Description Tables\n"); 1299 goto error1; 1300 } 1301 1302 /* 1303 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1304 * device is found in the namespace. 1305 * 1306 * This is accomplished by looking for the ECDT table and getting the EC 1307 * parameters out of that. 1308 * 1309 * Do that before calling acpi_initialize_objects() which may trigger EC 1310 * address space accesses. 1311 */ 1312 acpi_ec_ecdt_probe(); 1313 1314 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1315 if (ACPI_FAILURE(status)) { 1316 pr_err("Unable to start the ACPI Interpreter\n"); 1317 goto error1; 1318 } 1319 1320 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1321 if (ACPI_FAILURE(status)) { 1322 pr_err("Unable to initialize ACPI objects\n"); 1323 goto error1; 1324 } 1325 1326 /* Set capability bits for _OSC under processor scope */ 1327 acpi_early_processor_osc(); 1328 1329 /* 1330 * _OSC method may exist in module level code, 1331 * so it must be run after ACPI_FULL_INITIALIZATION 1332 */ 1333 acpi_bus_osc_negotiate_platform_control(); 1334 acpi_bus_osc_negotiate_usb_control(); 1335 1336 /* 1337 * _PDC control method may load dynamic SSDT tables, 1338 * and we need to install the table handler before that. 1339 */ 1340 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1341 1342 acpi_sysfs_init(); 1343 1344 acpi_early_processor_set_pdc(); 1345 1346 /* 1347 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1348 * is necessary to enable it as early as possible. 1349 */ 1350 acpi_ec_dsdt_probe(); 1351 1352 pr_info("Interpreter enabled\n"); 1353 1354 /* Initialize sleep structures */ 1355 acpi_sleep_init(); 1356 1357 /* 1358 * Get the system interrupt model and evaluate \_PIC. 1359 */ 1360 result = acpi_bus_init_irq(); 1361 if (result) 1362 goto error1; 1363 1364 /* 1365 * Register the for all standard device notifications. 1366 */ 1367 status = 1368 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1369 &acpi_bus_notify, NULL); 1370 if (ACPI_FAILURE(status)) { 1371 pr_err("Unable to register for system notifications\n"); 1372 goto error1; 1373 } 1374 1375 /* 1376 * Create the top ACPI proc directory 1377 */ 1378 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1379 1380 result = bus_register(&acpi_bus_type); 1381 if (!result) 1382 return 0; 1383 1384 /* Mimic structured exception handling */ 1385 error1: 1386 acpi_terminate(); 1387 return -ENODEV; 1388 } 1389 1390 struct kobject *acpi_kobj; 1391 EXPORT_SYMBOL_GPL(acpi_kobj); 1392 1393 static int __init acpi_init(void) 1394 { 1395 int result; 1396 1397 if (acpi_disabled) { 1398 pr_info("Interpreter disabled.\n"); 1399 return -ENODEV; 1400 } 1401 1402 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1403 if (!acpi_kobj) 1404 pr_debug("%s: kset create error\n", __func__); 1405 1406 init_prmt(); 1407 acpi_init_pcc(); 1408 result = acpi_bus_init(); 1409 if (result) { 1410 kobject_put(acpi_kobj); 1411 disable_acpi(); 1412 return result; 1413 } 1414 1415 pci_mmcfg_late_init(); 1416 acpi_iort_init(); 1417 acpi_viot_early_init(); 1418 acpi_hest_init(); 1419 acpi_ghes_init(); 1420 acpi_scan_init(); 1421 acpi_ec_init(); 1422 acpi_debugfs_init(); 1423 acpi_sleep_proc_init(); 1424 acpi_wakeup_device_init(); 1425 acpi_debugger_init(); 1426 acpi_setup_sb_notify_handler(); 1427 acpi_viot_init(); 1428 acpi_agdi_init(); 1429 return 0; 1430 } 1431 1432 subsys_initcall(acpi_init); 1433