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_cppc_not_supported; 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 #ifdef CONFIG_ACPI_CPPC_LIB 362 osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] & 363 (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT)); 364 #endif 365 366 /* 367 * Now run _OSC again with query flag clear and with the caps 368 * supported by both the OS and the platform. 369 */ 370 capbuf[OSC_QUERY_DWORD] = 0; 371 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; 372 kfree(context.ret.pointer); 373 374 if (ACPI_FAILURE(acpi_run_osc(handle, &context))) 375 return; 376 377 capbuf_ret = context.ret.pointer; 378 if (context.ret.length > OSC_SUPPORT_DWORD) { 379 osc_sb_apei_support_acked = 380 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 381 osc_pc_lpi_support_confirmed = 382 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 383 osc_sb_native_usb4_support_confirmed = 384 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; 385 osc_cpc_flexible_adr_space_confirmed = 386 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 387 } 388 389 kfree(context.ret.pointer); 390 } 391 392 /* 393 * Native control of USB4 capabilities. If any of the tunneling bits is 394 * set it means OS is in control and we use software based connection 395 * manager. 396 */ 397 u32 osc_sb_native_usb4_control; 398 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); 399 400 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) 401 { 402 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, 403 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', 404 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', 405 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', 406 (bits & OSC_USB_XDOMAIN) ? '+' : '-'); 407 } 408 409 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; 410 static void acpi_bus_osc_negotiate_usb_control(void) 411 { 412 u32 capbuf[3]; 413 struct acpi_osc_context context = { 414 .uuid_str = sb_usb_uuid_str, 415 .rev = 1, 416 .cap.length = sizeof(capbuf), 417 .cap.pointer = capbuf, 418 }; 419 acpi_handle handle; 420 acpi_status status; 421 u32 control; 422 423 if (!osc_sb_native_usb4_support_confirmed) 424 return; 425 426 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 427 return; 428 429 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | 430 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; 431 432 capbuf[OSC_QUERY_DWORD] = 0; 433 capbuf[OSC_SUPPORT_DWORD] = 0; 434 capbuf[OSC_CONTROL_DWORD] = control; 435 436 status = acpi_run_osc(handle, &context); 437 if (ACPI_FAILURE(status)) 438 return; 439 440 if (context.ret.length != sizeof(capbuf)) { 441 pr_info("USB4 _OSC: returned invalid length buffer\n"); 442 goto out_free; 443 } 444 445 osc_sb_native_usb4_control = 446 control & acpi_osc_ctx_get_pci_control(&context); 447 448 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 449 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", 450 osc_sb_native_usb4_control); 451 452 out_free: 453 kfree(context.ret.pointer); 454 } 455 456 /* -------------------------------------------------------------------------- 457 Notification Handling 458 -------------------------------------------------------------------------- */ 459 460 /** 461 * acpi_bus_notify 462 * --------------- 463 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 464 */ 465 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 466 { 467 struct acpi_device *adev; 468 struct acpi_driver *driver; 469 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 470 bool hotplug_event = false; 471 472 switch (type) { 473 case ACPI_NOTIFY_BUS_CHECK: 474 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 475 hotplug_event = true; 476 break; 477 478 case ACPI_NOTIFY_DEVICE_CHECK: 479 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 480 hotplug_event = true; 481 break; 482 483 case ACPI_NOTIFY_DEVICE_WAKE: 484 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 485 break; 486 487 case ACPI_NOTIFY_EJECT_REQUEST: 488 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 489 hotplug_event = true; 490 break; 491 492 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 493 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 494 /* TBD: Exactly what does 'light' mean? */ 495 break; 496 497 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 498 acpi_handle_err(handle, "Device cannot be configured due " 499 "to a frequency mismatch\n"); 500 break; 501 502 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 503 acpi_handle_err(handle, "Device cannot be configured due " 504 "to a bus mode mismatch\n"); 505 break; 506 507 case ACPI_NOTIFY_POWER_FAULT: 508 acpi_handle_err(handle, "Device has suffered a power fault\n"); 509 break; 510 511 default: 512 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 513 break; 514 } 515 516 adev = acpi_bus_get_acpi_device(handle); 517 if (!adev) 518 goto err; 519 520 driver = adev->driver; 521 if (driver && driver->ops.notify && 522 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 523 driver->ops.notify(adev, type); 524 525 if (!hotplug_event) { 526 acpi_bus_put_acpi_device(adev); 527 return; 528 } 529 530 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 531 return; 532 533 acpi_bus_put_acpi_device(adev); 534 535 err: 536 acpi_evaluate_ost(handle, type, ost_code, NULL); 537 } 538 539 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 540 { 541 struct acpi_device *device = data; 542 543 device->driver->ops.notify(device, event); 544 } 545 546 static void acpi_notify_device_fixed(void *data) 547 { 548 struct acpi_device *device = data; 549 550 /* Fixed hardware devices have no handles */ 551 acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 552 } 553 554 static u32 acpi_device_fixed_event(void *data) 555 { 556 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data); 557 return ACPI_INTERRUPT_HANDLED; 558 } 559 560 static int acpi_device_install_notify_handler(struct acpi_device *device) 561 { 562 acpi_status status; 563 564 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 565 status = 566 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 567 acpi_device_fixed_event, 568 device); 569 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 570 status = 571 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 572 acpi_device_fixed_event, 573 device); 574 else 575 status = acpi_install_notify_handler(device->handle, 576 ACPI_DEVICE_NOTIFY, 577 acpi_notify_device, 578 device); 579 580 if (ACPI_FAILURE(status)) 581 return -EINVAL; 582 return 0; 583 } 584 585 static void acpi_device_remove_notify_handler(struct acpi_device *device) 586 { 587 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 588 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 589 acpi_device_fixed_event); 590 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 591 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 592 acpi_device_fixed_event); 593 else 594 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 595 acpi_notify_device); 596 } 597 598 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 599 600 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 601 #define ACPI_SB_INDICATE_INTERVAL 10000 602 603 static void sb_notify_work(struct work_struct *dummy) 604 { 605 acpi_handle sb_handle; 606 607 orderly_poweroff(true); 608 609 /* 610 * After initiating graceful shutdown, the ACPI spec requires OSPM 611 * to evaluate _OST method once every 10seconds to indicate that 612 * the shutdown is in progress 613 */ 614 acpi_get_handle(NULL, "\\_SB", &sb_handle); 615 while (1) { 616 pr_info("Graceful shutdown in progress.\n"); 617 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 618 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 619 msleep(ACPI_SB_INDICATE_INTERVAL); 620 } 621 } 622 623 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 624 { 625 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 626 627 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 628 if (!work_busy(&acpi_sb_work)) 629 schedule_work(&acpi_sb_work); 630 } else 631 pr_warn("event %x is not supported by \\_SB device\n", event); 632 } 633 634 static int __init acpi_setup_sb_notify_handler(void) 635 { 636 acpi_handle sb_handle; 637 638 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 639 return -ENXIO; 640 641 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 642 acpi_sb_notify, NULL))) 643 return -EINVAL; 644 645 return 0; 646 } 647 648 /* -------------------------------------------------------------------------- 649 Device Matching 650 -------------------------------------------------------------------------- */ 651 652 /** 653 * acpi_get_first_physical_node - Get first physical node of an ACPI device 654 * @adev: ACPI device in question 655 * 656 * Return: First physical node of ACPI device @adev 657 */ 658 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 659 { 660 struct mutex *physical_node_lock = &adev->physical_node_lock; 661 struct device *phys_dev; 662 663 mutex_lock(physical_node_lock); 664 if (list_empty(&adev->physical_node_list)) { 665 phys_dev = NULL; 666 } else { 667 const struct acpi_device_physical_node *node; 668 669 node = list_first_entry(&adev->physical_node_list, 670 struct acpi_device_physical_node, node); 671 672 phys_dev = node->dev; 673 } 674 mutex_unlock(physical_node_lock); 675 return phys_dev; 676 } 677 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 678 679 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 680 const struct device *dev) 681 { 682 const struct device *phys_dev = acpi_get_first_physical_node(adev); 683 684 return phys_dev && phys_dev == dev ? adev : NULL; 685 } 686 687 /** 688 * acpi_device_is_first_physical_node - Is given dev first physical node 689 * @adev: ACPI companion device 690 * @dev: Physical device to check 691 * 692 * Function checks if given @dev is the first physical devices attached to 693 * the ACPI companion device. This distinction is needed in some cases 694 * where the same companion device is shared between many physical devices. 695 * 696 * Note that the caller have to provide valid @adev pointer. 697 */ 698 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 699 const struct device *dev) 700 { 701 return !!acpi_primary_dev_companion(adev, dev); 702 } 703 704 /* 705 * acpi_companion_match() - Can we match via ACPI companion device 706 * @dev: Device in question 707 * 708 * Check if the given device has an ACPI companion and if that companion has 709 * a valid list of PNP IDs, and if the device is the first (primary) physical 710 * device associated with it. Return the companion pointer if that's the case 711 * or NULL otherwise. 712 * 713 * If multiple physical devices are attached to a single ACPI companion, we need 714 * to be careful. The usage scenario for this kind of relationship is that all 715 * of the physical devices in question use resources provided by the ACPI 716 * companion. A typical case is an MFD device where all the sub-devices share 717 * the parent's ACPI companion. In such cases we can only allow the primary 718 * (first) physical device to be matched with the help of the companion's PNP 719 * IDs. 720 * 721 * Additional physical devices sharing the ACPI companion can still use 722 * resources available from it but they will be matched normally using functions 723 * provided by their bus types (and analogously for their modalias). 724 */ 725 struct acpi_device *acpi_companion_match(const struct device *dev) 726 { 727 struct acpi_device *adev; 728 729 adev = ACPI_COMPANION(dev); 730 if (!adev) 731 return NULL; 732 733 if (list_empty(&adev->pnp.ids)) 734 return NULL; 735 736 return acpi_primary_dev_companion(adev, dev); 737 } 738 739 /** 740 * acpi_of_match_device - Match device object using the "compatible" property. 741 * @adev: ACPI device object to match. 742 * @of_match_table: List of device IDs to match against. 743 * @of_id: OF ID if matched 744 * 745 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 746 * identifiers and a _DSD object with the "compatible" property, use that 747 * property to match against the given list of identifiers. 748 */ 749 static bool acpi_of_match_device(struct acpi_device *adev, 750 const struct of_device_id *of_match_table, 751 const struct of_device_id **of_id) 752 { 753 const union acpi_object *of_compatible, *obj; 754 int i, nval; 755 756 if (!adev) 757 return false; 758 759 of_compatible = adev->data.of_compatible; 760 if (!of_match_table || !of_compatible) 761 return false; 762 763 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 764 nval = of_compatible->package.count; 765 obj = of_compatible->package.elements; 766 } else { /* Must be ACPI_TYPE_STRING. */ 767 nval = 1; 768 obj = of_compatible; 769 } 770 /* Now we can look for the driver DT compatible strings */ 771 for (i = 0; i < nval; i++, obj++) { 772 const struct of_device_id *id; 773 774 for (id = of_match_table; id->compatible[0]; id++) 775 if (!strcasecmp(obj->string.pointer, id->compatible)) { 776 if (of_id) 777 *of_id = id; 778 return true; 779 } 780 } 781 782 return false; 783 } 784 785 static bool acpi_of_modalias(struct acpi_device *adev, 786 char *modalias, size_t len) 787 { 788 const union acpi_object *of_compatible; 789 const union acpi_object *obj; 790 const char *str, *chr; 791 792 of_compatible = adev->data.of_compatible; 793 if (!of_compatible) 794 return false; 795 796 if (of_compatible->type == ACPI_TYPE_PACKAGE) 797 obj = of_compatible->package.elements; 798 else /* Must be ACPI_TYPE_STRING. */ 799 obj = of_compatible; 800 801 str = obj->string.pointer; 802 chr = strchr(str, ','); 803 strlcpy(modalias, chr ? chr + 1 : str, len); 804 805 return true; 806 } 807 808 /** 809 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 810 * @adev: ACPI device object to match 811 * @default_id: ID string to use as default if no compatible string found 812 * @modalias: Pointer to buffer that modalias value will be copied into 813 * @len: Length of modalias buffer 814 * 815 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 816 * If there is a compatible string for @adev, it will be copied to @modalias 817 * with the vendor prefix stripped; otherwise, @default_id will be used. 818 */ 819 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 820 char *modalias, size_t len) 821 { 822 if (!acpi_of_modalias(adev, modalias, len)) 823 strlcpy(modalias, default_id, len); 824 } 825 EXPORT_SYMBOL_GPL(acpi_set_modalias); 826 827 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 828 struct acpi_hardware_id *hwid) 829 { 830 int i, msk, byte_shift; 831 char buf[3]; 832 833 if (!id->cls) 834 return false; 835 836 /* Apply class-code bitmask, before checking each class-code byte */ 837 for (i = 1; i <= 3; i++) { 838 byte_shift = 8 * (3 - i); 839 msk = (id->cls_msk >> byte_shift) & 0xFF; 840 if (!msk) 841 continue; 842 843 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 844 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 845 return false; 846 } 847 return true; 848 } 849 850 static bool __acpi_match_device(struct acpi_device *device, 851 const struct acpi_device_id *acpi_ids, 852 const struct of_device_id *of_ids, 853 const struct acpi_device_id **acpi_id, 854 const struct of_device_id **of_id) 855 { 856 const struct acpi_device_id *id; 857 struct acpi_hardware_id *hwid; 858 859 /* 860 * If the device is not present, it is unnecessary to load device 861 * driver for it. 862 */ 863 if (!device || !device->status.present) 864 return false; 865 866 list_for_each_entry(hwid, &device->pnp.ids, list) { 867 /* First, check the ACPI/PNP IDs provided by the caller. */ 868 if (acpi_ids) { 869 for (id = acpi_ids; id->id[0] || id->cls; id++) { 870 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 871 goto out_acpi_match; 872 if (id->cls && __acpi_match_device_cls(id, hwid)) 873 goto out_acpi_match; 874 } 875 } 876 877 /* 878 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 879 * "compatible" property if found. 880 */ 881 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 882 return acpi_of_match_device(device, of_ids, of_id); 883 } 884 return false; 885 886 out_acpi_match: 887 if (acpi_id) 888 *acpi_id = id; 889 return true; 890 } 891 892 /** 893 * acpi_match_device - Match a struct device against a given list of ACPI IDs 894 * @ids: Array of struct acpi_device_id object to match against. 895 * @dev: The device structure to match. 896 * 897 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 898 * object for that handle and use that object to match against a given list of 899 * device IDs. 900 * 901 * Return a pointer to the first matching ID on success or %NULL on failure. 902 */ 903 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 904 const struct device *dev) 905 { 906 const struct acpi_device_id *id = NULL; 907 908 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 909 return id; 910 } 911 EXPORT_SYMBOL_GPL(acpi_match_device); 912 913 static const void *acpi_of_device_get_match_data(const struct device *dev) 914 { 915 struct acpi_device *adev = ACPI_COMPANION(dev); 916 const struct of_device_id *match = NULL; 917 918 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 919 return NULL; 920 921 return match->data; 922 } 923 924 const void *acpi_device_get_match_data(const struct device *dev) 925 { 926 const struct acpi_device_id *match; 927 928 if (!dev->driver->acpi_match_table) 929 return acpi_of_device_get_match_data(dev); 930 931 match = acpi_match_device(dev->driver->acpi_match_table, dev); 932 if (!match) 933 return NULL; 934 935 return (const void *)match->driver_data; 936 } 937 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 938 939 int acpi_match_device_ids(struct acpi_device *device, 940 const struct acpi_device_id *ids) 941 { 942 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 943 } 944 EXPORT_SYMBOL(acpi_match_device_ids); 945 946 bool acpi_driver_match_device(struct device *dev, 947 const struct device_driver *drv) 948 { 949 if (!drv->acpi_match_table) 950 return acpi_of_match_device(ACPI_COMPANION(dev), 951 drv->of_match_table, 952 NULL); 953 954 return __acpi_match_device(acpi_companion_match(dev), 955 drv->acpi_match_table, drv->of_match_table, 956 NULL, NULL); 957 } 958 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 959 960 /* -------------------------------------------------------------------------- 961 ACPI Driver Management 962 -------------------------------------------------------------------------- */ 963 964 /** 965 * acpi_bus_register_driver - register a driver with the ACPI bus 966 * @driver: driver being registered 967 * 968 * Registers a driver with the ACPI bus. Searches the namespace for all 969 * devices that match the driver's criteria and binds. Returns zero for 970 * success or a negative error status for failure. 971 */ 972 int acpi_bus_register_driver(struct acpi_driver *driver) 973 { 974 int ret; 975 976 if (acpi_disabled) 977 return -ENODEV; 978 driver->drv.name = driver->name; 979 driver->drv.bus = &acpi_bus_type; 980 driver->drv.owner = driver->owner; 981 982 ret = driver_register(&driver->drv); 983 return ret; 984 } 985 986 EXPORT_SYMBOL(acpi_bus_register_driver); 987 988 /** 989 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 990 * @driver: driver to unregister 991 * 992 * Unregisters a driver with the ACPI bus. Searches the namespace for all 993 * devices that match the driver's criteria and unbinds. 994 */ 995 void acpi_bus_unregister_driver(struct acpi_driver *driver) 996 { 997 driver_unregister(&driver->drv); 998 } 999 1000 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1001 1002 /* -------------------------------------------------------------------------- 1003 ACPI Bus operations 1004 -------------------------------------------------------------------------- */ 1005 1006 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 1007 { 1008 struct acpi_device *acpi_dev = to_acpi_device(dev); 1009 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1010 1011 return acpi_dev->flags.match_driver 1012 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1013 } 1014 1015 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 1016 { 1017 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1018 } 1019 1020 static int acpi_device_probe(struct device *dev) 1021 { 1022 struct acpi_device *acpi_dev = to_acpi_device(dev); 1023 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1024 int ret; 1025 1026 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1027 return -EINVAL; 1028 1029 if (!acpi_drv->ops.add) 1030 return -ENOSYS; 1031 1032 ret = acpi_drv->ops.add(acpi_dev); 1033 if (ret) 1034 return ret; 1035 1036 acpi_dev->driver = acpi_drv; 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 = NULL; 1048 acpi_dev->driver_data = NULL; 1049 return ret; 1050 } 1051 } 1052 1053 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, 1054 acpi_dev->pnp.bus_id); 1055 1056 get_device(dev); 1057 return 0; 1058 } 1059 1060 static void acpi_device_remove(struct device *dev) 1061 { 1062 struct acpi_device *acpi_dev = to_acpi_device(dev); 1063 struct acpi_driver *acpi_drv = acpi_dev->driver; 1064 1065 if (acpi_drv) { 1066 if (acpi_drv->ops.notify) 1067 acpi_device_remove_notify_handler(acpi_dev); 1068 if (acpi_drv->ops.remove) 1069 acpi_drv->ops.remove(acpi_dev); 1070 } 1071 acpi_dev->driver = NULL; 1072 acpi_dev->driver_data = NULL; 1073 1074 put_device(dev); 1075 } 1076 1077 struct bus_type acpi_bus_type = { 1078 .name = "acpi", 1079 .match = acpi_bus_match, 1080 .probe = acpi_device_probe, 1081 .remove = acpi_device_remove, 1082 .uevent = acpi_device_uevent, 1083 }; 1084 1085 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1086 { 1087 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1088 } 1089 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1090 1091 struct acpi_dev_walk_context { 1092 int (*fn)(struct acpi_device *, void *); 1093 void *data; 1094 }; 1095 1096 static int acpi_dev_for_one_check(struct device *dev, void *context) 1097 { 1098 struct acpi_dev_walk_context *adwc = context; 1099 1100 if (dev->bus != &acpi_bus_type) 1101 return 0; 1102 1103 return adwc->fn(to_acpi_device(dev), adwc->data); 1104 } 1105 1106 int acpi_dev_for_each_child(struct acpi_device *adev, 1107 int (*fn)(struct acpi_device *, void *), void *data) 1108 { 1109 struct acpi_dev_walk_context adwc = { 1110 .fn = fn, 1111 .data = data, 1112 }; 1113 1114 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1115 } 1116 1117 /* -------------------------------------------------------------------------- 1118 Initialization/Cleanup 1119 -------------------------------------------------------------------------- */ 1120 1121 static int __init acpi_bus_init_irq(void) 1122 { 1123 acpi_status status; 1124 char *message = NULL; 1125 1126 1127 /* 1128 * Let the system know what interrupt model we are using by 1129 * evaluating the \_PIC object, if exists. 1130 */ 1131 1132 switch (acpi_irq_model) { 1133 case ACPI_IRQ_MODEL_PIC: 1134 message = "PIC"; 1135 break; 1136 case ACPI_IRQ_MODEL_IOAPIC: 1137 message = "IOAPIC"; 1138 break; 1139 case ACPI_IRQ_MODEL_IOSAPIC: 1140 message = "IOSAPIC"; 1141 break; 1142 case ACPI_IRQ_MODEL_GIC: 1143 message = "GIC"; 1144 break; 1145 case ACPI_IRQ_MODEL_PLATFORM: 1146 message = "platform specific model"; 1147 break; 1148 default: 1149 pr_info("Unknown interrupt routing model\n"); 1150 return -ENODEV; 1151 } 1152 1153 pr_info("Using %s for interrupt routing\n", message); 1154 1155 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1156 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1157 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1158 return -ENODEV; 1159 } 1160 1161 return 0; 1162 } 1163 1164 /** 1165 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1166 * 1167 * The ACPI tables are accessible after this, but the handling of events has not 1168 * been initialized and the global lock is not available yet, so AML should not 1169 * be executed at this point. 1170 * 1171 * Doing this before switching the EFI runtime services to virtual mode allows 1172 * the EfiBootServices memory to be freed slightly earlier on boot. 1173 */ 1174 void __init acpi_early_init(void) 1175 { 1176 acpi_status status; 1177 1178 if (acpi_disabled) 1179 return; 1180 1181 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1182 1183 /* enable workarounds, unless strict ACPI spec. compliance */ 1184 if (!acpi_strict) 1185 acpi_gbl_enable_interpreter_slack = TRUE; 1186 1187 acpi_permanent_mmap = true; 1188 1189 #ifdef CONFIG_X86 1190 /* 1191 * If the machine falls into the DMI check table, 1192 * DSDT will be copied to memory. 1193 * Note that calling dmi_check_system() here on other architectures 1194 * would not be OK because only x86 initializes dmi early enough. 1195 * Thankfully only x86 systems need such quirks for now. 1196 */ 1197 dmi_check_system(dsdt_dmi_table); 1198 #endif 1199 1200 status = acpi_reallocate_root_table(); 1201 if (ACPI_FAILURE(status)) { 1202 pr_err("Unable to reallocate ACPI tables\n"); 1203 goto error0; 1204 } 1205 1206 status = acpi_initialize_subsystem(); 1207 if (ACPI_FAILURE(status)) { 1208 pr_err("Unable to initialize the ACPI Interpreter\n"); 1209 goto error0; 1210 } 1211 1212 #ifdef CONFIG_X86 1213 if (!acpi_ioapic) { 1214 /* compatible (0) means level (3) */ 1215 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1216 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1217 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1218 } 1219 /* Set PIC-mode SCI trigger type */ 1220 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1221 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1222 } else { 1223 /* 1224 * now that acpi_gbl_FADT is initialized, 1225 * update it with result from INT_SRC_OVR parsing 1226 */ 1227 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1228 } 1229 #endif 1230 return; 1231 1232 error0: 1233 disable_acpi(); 1234 } 1235 1236 /** 1237 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1238 * 1239 * Switch over the platform to the ACPI mode (if possible). 1240 * 1241 * Doing this too early is generally unsafe, but at the same time it needs to be 1242 * done before all things that really depend on ACPI. The right spot appears to 1243 * be before finalizing the EFI initialization. 1244 */ 1245 void __init acpi_subsystem_init(void) 1246 { 1247 acpi_status status; 1248 1249 if (acpi_disabled) 1250 return; 1251 1252 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1253 if (ACPI_FAILURE(status)) { 1254 pr_err("Unable to enable ACPI\n"); 1255 disable_acpi(); 1256 } else { 1257 /* 1258 * If the system is using ACPI then we can be reasonably 1259 * confident that any regulators are managed by the firmware 1260 * so tell the regulator core it has everything it needs to 1261 * know. 1262 */ 1263 regulator_has_full_constraints(); 1264 } 1265 } 1266 1267 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1268 { 1269 if (event == ACPI_TABLE_EVENT_LOAD) 1270 acpi_scan_table_notify(); 1271 1272 return acpi_sysfs_table_handler(event, table, context); 1273 } 1274 1275 static int __init acpi_bus_init(void) 1276 { 1277 int result; 1278 acpi_status status; 1279 1280 acpi_os_initialize1(); 1281 1282 status = acpi_load_tables(); 1283 if (ACPI_FAILURE(status)) { 1284 pr_err("Unable to load the System Description Tables\n"); 1285 goto error1; 1286 } 1287 1288 /* 1289 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1290 * device is found in the namespace. 1291 * 1292 * This is accomplished by looking for the ECDT table and getting the EC 1293 * parameters out of that. 1294 * 1295 * Do that before calling acpi_initialize_objects() which may trigger EC 1296 * address space accesses. 1297 */ 1298 acpi_ec_ecdt_probe(); 1299 1300 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1301 if (ACPI_FAILURE(status)) { 1302 pr_err("Unable to start the ACPI Interpreter\n"); 1303 goto error1; 1304 } 1305 1306 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1307 if (ACPI_FAILURE(status)) { 1308 pr_err("Unable to initialize ACPI objects\n"); 1309 goto error1; 1310 } 1311 1312 /* Set capability bits for _OSC under processor scope */ 1313 acpi_early_processor_osc(); 1314 1315 /* 1316 * _OSC method may exist in module level code, 1317 * so it must be run after ACPI_FULL_INITIALIZATION 1318 */ 1319 acpi_bus_osc_negotiate_platform_control(); 1320 acpi_bus_osc_negotiate_usb_control(); 1321 1322 /* 1323 * _PDC control method may load dynamic SSDT tables, 1324 * and we need to install the table handler before that. 1325 */ 1326 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1327 1328 acpi_sysfs_init(); 1329 1330 acpi_early_processor_set_pdc(); 1331 1332 /* 1333 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1334 * is necessary to enable it as early as possible. 1335 */ 1336 acpi_ec_dsdt_probe(); 1337 1338 pr_info("Interpreter enabled\n"); 1339 1340 /* Initialize sleep structures */ 1341 acpi_sleep_init(); 1342 1343 /* 1344 * Get the system interrupt model and evaluate \_PIC. 1345 */ 1346 result = acpi_bus_init_irq(); 1347 if (result) 1348 goto error1; 1349 1350 /* 1351 * Register the for all standard device notifications. 1352 */ 1353 status = 1354 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1355 &acpi_bus_notify, NULL); 1356 if (ACPI_FAILURE(status)) { 1357 pr_err("Unable to register for system notifications\n"); 1358 goto error1; 1359 } 1360 1361 /* 1362 * Create the top ACPI proc directory 1363 */ 1364 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1365 1366 result = bus_register(&acpi_bus_type); 1367 if (!result) 1368 return 0; 1369 1370 /* Mimic structured exception handling */ 1371 error1: 1372 acpi_terminate(); 1373 return -ENODEV; 1374 } 1375 1376 struct kobject *acpi_kobj; 1377 EXPORT_SYMBOL_GPL(acpi_kobj); 1378 1379 static int __init acpi_init(void) 1380 { 1381 int result; 1382 1383 if (acpi_disabled) { 1384 pr_info("Interpreter disabled.\n"); 1385 return -ENODEV; 1386 } 1387 1388 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1389 if (!acpi_kobj) 1390 pr_debug("%s: kset create error\n", __func__); 1391 1392 init_prmt(); 1393 acpi_init_pcc(); 1394 result = acpi_bus_init(); 1395 if (result) { 1396 kobject_put(acpi_kobj); 1397 disable_acpi(); 1398 return result; 1399 } 1400 1401 pci_mmcfg_late_init(); 1402 acpi_iort_init(); 1403 acpi_hest_init(); 1404 acpi_ghes_init(); 1405 acpi_scan_init(); 1406 acpi_ec_init(); 1407 acpi_debugfs_init(); 1408 acpi_sleep_proc_init(); 1409 acpi_wakeup_device_init(); 1410 acpi_debugger_init(); 1411 acpi_setup_sb_notify_handler(); 1412 acpi_viot_init(); 1413 acpi_agdi_init(); 1414 return 0; 1415 } 1416 1417 subsys_initcall(acpi_init); 1418