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 struct acpi_driver *driver; 468 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 469 bool hotplug_event = false; 470 471 switch (type) { 472 case ACPI_NOTIFY_BUS_CHECK: 473 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 474 hotplug_event = true; 475 break; 476 477 case ACPI_NOTIFY_DEVICE_CHECK: 478 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 479 hotplug_event = true; 480 break; 481 482 case ACPI_NOTIFY_DEVICE_WAKE: 483 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 484 break; 485 486 case ACPI_NOTIFY_EJECT_REQUEST: 487 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 488 hotplug_event = true; 489 break; 490 491 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 492 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 493 /* TBD: Exactly what does 'light' mean? */ 494 break; 495 496 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 497 acpi_handle_err(handle, "Device cannot be configured due " 498 "to a frequency mismatch\n"); 499 break; 500 501 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 502 acpi_handle_err(handle, "Device cannot be configured due " 503 "to a bus mode mismatch\n"); 504 break; 505 506 case ACPI_NOTIFY_POWER_FAULT: 507 acpi_handle_err(handle, "Device has suffered a power fault\n"); 508 break; 509 510 default: 511 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 512 break; 513 } 514 515 adev = acpi_bus_get_acpi_device(handle); 516 if (!adev) 517 goto err; 518 519 driver = adev->driver; 520 if (driver && driver->ops.notify && 521 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 522 driver->ops.notify(adev, type); 523 524 if (!hotplug_event) { 525 acpi_bus_put_acpi_device(adev); 526 return; 527 } 528 529 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 530 return; 531 532 acpi_bus_put_acpi_device(adev); 533 534 err: 535 acpi_evaluate_ost(handle, type, ost_code, NULL); 536 } 537 538 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 539 { 540 struct acpi_device *device = data; 541 542 device->driver->ops.notify(device, event); 543 } 544 545 static void acpi_notify_device_fixed(void *data) 546 { 547 struct acpi_device *device = data; 548 549 /* Fixed hardware devices have no handles */ 550 acpi_notify_device(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 551 } 552 553 static u32 acpi_device_fixed_event(void *data) 554 { 555 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_notify_device_fixed, data); 556 return ACPI_INTERRUPT_HANDLED; 557 } 558 559 static int acpi_device_install_notify_handler(struct acpi_device *device) 560 { 561 acpi_status status; 562 563 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 564 status = 565 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 566 acpi_device_fixed_event, 567 device); 568 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 569 status = 570 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 571 acpi_device_fixed_event, 572 device); 573 else 574 status = acpi_install_notify_handler(device->handle, 575 ACPI_DEVICE_NOTIFY, 576 acpi_notify_device, 577 device); 578 579 if (ACPI_FAILURE(status)) 580 return -EINVAL; 581 return 0; 582 } 583 584 static void acpi_device_remove_notify_handler(struct acpi_device *device) 585 { 586 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 587 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 588 acpi_device_fixed_event); 589 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 590 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 591 acpi_device_fixed_event); 592 else 593 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 594 acpi_notify_device); 595 } 596 597 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 598 599 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 600 #define ACPI_SB_INDICATE_INTERVAL 10000 601 602 static void sb_notify_work(struct work_struct *dummy) 603 { 604 acpi_handle sb_handle; 605 606 orderly_poweroff(true); 607 608 /* 609 * After initiating graceful shutdown, the ACPI spec requires OSPM 610 * to evaluate _OST method once every 10seconds to indicate that 611 * the shutdown is in progress 612 */ 613 acpi_get_handle(NULL, "\\_SB", &sb_handle); 614 while (1) { 615 pr_info("Graceful shutdown in progress.\n"); 616 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 617 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 618 msleep(ACPI_SB_INDICATE_INTERVAL); 619 } 620 } 621 622 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 623 { 624 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 625 626 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 627 if (!work_busy(&acpi_sb_work)) 628 schedule_work(&acpi_sb_work); 629 } else 630 pr_warn("event %x is not supported by \\_SB device\n", event); 631 } 632 633 static int __init acpi_setup_sb_notify_handler(void) 634 { 635 acpi_handle sb_handle; 636 637 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 638 return -ENXIO; 639 640 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 641 acpi_sb_notify, NULL))) 642 return -EINVAL; 643 644 return 0; 645 } 646 647 /* -------------------------------------------------------------------------- 648 Device Matching 649 -------------------------------------------------------------------------- */ 650 651 /** 652 * acpi_get_first_physical_node - Get first physical node of an ACPI device 653 * @adev: ACPI device in question 654 * 655 * Return: First physical node of ACPI device @adev 656 */ 657 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 658 { 659 struct mutex *physical_node_lock = &adev->physical_node_lock; 660 struct device *phys_dev; 661 662 mutex_lock(physical_node_lock); 663 if (list_empty(&adev->physical_node_list)) { 664 phys_dev = NULL; 665 } else { 666 const struct acpi_device_physical_node *node; 667 668 node = list_first_entry(&adev->physical_node_list, 669 struct acpi_device_physical_node, node); 670 671 phys_dev = node->dev; 672 } 673 mutex_unlock(physical_node_lock); 674 return phys_dev; 675 } 676 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 677 678 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 679 const struct device *dev) 680 { 681 const struct device *phys_dev = acpi_get_first_physical_node(adev); 682 683 return phys_dev && phys_dev == dev ? adev : NULL; 684 } 685 686 /** 687 * acpi_device_is_first_physical_node - Is given dev first physical node 688 * @adev: ACPI companion device 689 * @dev: Physical device to check 690 * 691 * Function checks if given @dev is the first physical devices attached to 692 * the ACPI companion device. This distinction is needed in some cases 693 * where the same companion device is shared between many physical devices. 694 * 695 * Note that the caller have to provide valid @adev pointer. 696 */ 697 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 698 const struct device *dev) 699 { 700 return !!acpi_primary_dev_companion(adev, dev); 701 } 702 703 /* 704 * acpi_companion_match() - Can we match via ACPI companion device 705 * @dev: Device in question 706 * 707 * Check if the given device has an ACPI companion and if that companion has 708 * a valid list of PNP IDs, and if the device is the first (primary) physical 709 * device associated with it. Return the companion pointer if that's the case 710 * or NULL otherwise. 711 * 712 * If multiple physical devices are attached to a single ACPI companion, we need 713 * to be careful. The usage scenario for this kind of relationship is that all 714 * of the physical devices in question use resources provided by the ACPI 715 * companion. A typical case is an MFD device where all the sub-devices share 716 * the parent's ACPI companion. In such cases we can only allow the primary 717 * (first) physical device to be matched with the help of the companion's PNP 718 * IDs. 719 * 720 * Additional physical devices sharing the ACPI companion can still use 721 * resources available from it but they will be matched normally using functions 722 * provided by their bus types (and analogously for their modalias). 723 */ 724 struct acpi_device *acpi_companion_match(const struct device *dev) 725 { 726 struct acpi_device *adev; 727 728 adev = ACPI_COMPANION(dev); 729 if (!adev) 730 return NULL; 731 732 if (list_empty(&adev->pnp.ids)) 733 return NULL; 734 735 return acpi_primary_dev_companion(adev, dev); 736 } 737 738 /** 739 * acpi_of_match_device - Match device object using the "compatible" property. 740 * @adev: ACPI device object to match. 741 * @of_match_table: List of device IDs to match against. 742 * @of_id: OF ID if matched 743 * 744 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 745 * identifiers and a _DSD object with the "compatible" property, use that 746 * property to match against the given list of identifiers. 747 */ 748 static bool acpi_of_match_device(struct acpi_device *adev, 749 const struct of_device_id *of_match_table, 750 const struct of_device_id **of_id) 751 { 752 const union acpi_object *of_compatible, *obj; 753 int i, nval; 754 755 if (!adev) 756 return false; 757 758 of_compatible = adev->data.of_compatible; 759 if (!of_match_table || !of_compatible) 760 return false; 761 762 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 763 nval = of_compatible->package.count; 764 obj = of_compatible->package.elements; 765 } else { /* Must be ACPI_TYPE_STRING. */ 766 nval = 1; 767 obj = of_compatible; 768 } 769 /* Now we can look for the driver DT compatible strings */ 770 for (i = 0; i < nval; i++, obj++) { 771 const struct of_device_id *id; 772 773 for (id = of_match_table; id->compatible[0]; id++) 774 if (!strcasecmp(obj->string.pointer, id->compatible)) { 775 if (of_id) 776 *of_id = id; 777 return true; 778 } 779 } 780 781 return false; 782 } 783 784 static bool acpi_of_modalias(struct acpi_device *adev, 785 char *modalias, size_t len) 786 { 787 const union acpi_object *of_compatible; 788 const union acpi_object *obj; 789 const char *str, *chr; 790 791 of_compatible = adev->data.of_compatible; 792 if (!of_compatible) 793 return false; 794 795 if (of_compatible->type == ACPI_TYPE_PACKAGE) 796 obj = of_compatible->package.elements; 797 else /* Must be ACPI_TYPE_STRING. */ 798 obj = of_compatible; 799 800 str = obj->string.pointer; 801 chr = strchr(str, ','); 802 strlcpy(modalias, chr ? chr + 1 : str, len); 803 804 return true; 805 } 806 807 /** 808 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 809 * @adev: ACPI device object to match 810 * @default_id: ID string to use as default if no compatible string found 811 * @modalias: Pointer to buffer that modalias value will be copied into 812 * @len: Length of modalias buffer 813 * 814 * This is a counterpart of of_modalias_node() for struct acpi_device objects. 815 * If there is a compatible string for @adev, it will be copied to @modalias 816 * with the vendor prefix stripped; otherwise, @default_id will be used. 817 */ 818 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 819 char *modalias, size_t len) 820 { 821 if (!acpi_of_modalias(adev, modalias, len)) 822 strlcpy(modalias, default_id, len); 823 } 824 EXPORT_SYMBOL_GPL(acpi_set_modalias); 825 826 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 827 struct acpi_hardware_id *hwid) 828 { 829 int i, msk, byte_shift; 830 char buf[3]; 831 832 if (!id->cls) 833 return false; 834 835 /* Apply class-code bitmask, before checking each class-code byte */ 836 for (i = 1; i <= 3; i++) { 837 byte_shift = 8 * (3 - i); 838 msk = (id->cls_msk >> byte_shift) & 0xFF; 839 if (!msk) 840 continue; 841 842 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 843 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 844 return false; 845 } 846 return true; 847 } 848 849 static bool __acpi_match_device(struct acpi_device *device, 850 const struct acpi_device_id *acpi_ids, 851 const struct of_device_id *of_ids, 852 const struct acpi_device_id **acpi_id, 853 const struct of_device_id **of_id) 854 { 855 const struct acpi_device_id *id; 856 struct acpi_hardware_id *hwid; 857 858 /* 859 * If the device is not present, it is unnecessary to load device 860 * driver for it. 861 */ 862 if (!device || !device->status.present) 863 return false; 864 865 list_for_each_entry(hwid, &device->pnp.ids, list) { 866 /* First, check the ACPI/PNP IDs provided by the caller. */ 867 if (acpi_ids) { 868 for (id = acpi_ids; id->id[0] || id->cls; id++) { 869 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 870 goto out_acpi_match; 871 if (id->cls && __acpi_match_device_cls(id, hwid)) 872 goto out_acpi_match; 873 } 874 } 875 876 /* 877 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 878 * "compatible" property if found. 879 */ 880 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 881 return acpi_of_match_device(device, of_ids, of_id); 882 } 883 return false; 884 885 out_acpi_match: 886 if (acpi_id) 887 *acpi_id = id; 888 return true; 889 } 890 891 /** 892 * acpi_match_device - Match a struct device against a given list of ACPI IDs 893 * @ids: Array of struct acpi_device_id object to match against. 894 * @dev: The device structure to match. 895 * 896 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 897 * object for that handle and use that object to match against a given list of 898 * device IDs. 899 * 900 * Return a pointer to the first matching ID on success or %NULL on failure. 901 */ 902 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 903 const struct device *dev) 904 { 905 const struct acpi_device_id *id = NULL; 906 907 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL); 908 return id; 909 } 910 EXPORT_SYMBOL_GPL(acpi_match_device); 911 912 static const void *acpi_of_device_get_match_data(const struct device *dev) 913 { 914 struct acpi_device *adev = ACPI_COMPANION(dev); 915 const struct of_device_id *match = NULL; 916 917 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 918 return NULL; 919 920 return match->data; 921 } 922 923 const void *acpi_device_get_match_data(const struct device *dev) 924 { 925 const struct acpi_device_id *match; 926 927 if (!dev->driver->acpi_match_table) 928 return acpi_of_device_get_match_data(dev); 929 930 match = acpi_match_device(dev->driver->acpi_match_table, dev); 931 if (!match) 932 return NULL; 933 934 return (const void *)match->driver_data; 935 } 936 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 937 938 int acpi_match_device_ids(struct acpi_device *device, 939 const struct acpi_device_id *ids) 940 { 941 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 942 } 943 EXPORT_SYMBOL(acpi_match_device_ids); 944 945 bool acpi_driver_match_device(struct device *dev, 946 const struct device_driver *drv) 947 { 948 if (!drv->acpi_match_table) 949 return acpi_of_match_device(ACPI_COMPANION(dev), 950 drv->of_match_table, 951 NULL); 952 953 return __acpi_match_device(acpi_companion_match(dev), 954 drv->acpi_match_table, drv->of_match_table, 955 NULL, NULL); 956 } 957 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 958 959 /* -------------------------------------------------------------------------- 960 ACPI Driver Management 961 -------------------------------------------------------------------------- */ 962 963 /** 964 * acpi_bus_register_driver - register a driver with the ACPI bus 965 * @driver: driver being registered 966 * 967 * Registers a driver with the ACPI bus. Searches the namespace for all 968 * devices that match the driver's criteria and binds. Returns zero for 969 * success or a negative error status for failure. 970 */ 971 int acpi_bus_register_driver(struct acpi_driver *driver) 972 { 973 int ret; 974 975 if (acpi_disabled) 976 return -ENODEV; 977 driver->drv.name = driver->name; 978 driver->drv.bus = &acpi_bus_type; 979 driver->drv.owner = driver->owner; 980 981 ret = driver_register(&driver->drv); 982 return ret; 983 } 984 985 EXPORT_SYMBOL(acpi_bus_register_driver); 986 987 /** 988 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 989 * @driver: driver to unregister 990 * 991 * Unregisters a driver with the ACPI bus. Searches the namespace for all 992 * devices that match the driver's criteria and unbinds. 993 */ 994 void acpi_bus_unregister_driver(struct acpi_driver *driver) 995 { 996 driver_unregister(&driver->drv); 997 } 998 999 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1000 1001 /* -------------------------------------------------------------------------- 1002 ACPI Bus operations 1003 -------------------------------------------------------------------------- */ 1004 1005 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 1006 { 1007 struct acpi_device *acpi_dev = to_acpi_device(dev); 1008 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1009 1010 return acpi_dev->flags.match_driver 1011 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1012 } 1013 1014 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 1015 { 1016 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1017 } 1018 1019 static int acpi_device_probe(struct device *dev) 1020 { 1021 struct acpi_device *acpi_dev = to_acpi_device(dev); 1022 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1023 int ret; 1024 1025 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1026 return -EINVAL; 1027 1028 if (!acpi_drv->ops.add) 1029 return -ENOSYS; 1030 1031 ret = acpi_drv->ops.add(acpi_dev); 1032 if (ret) 1033 return ret; 1034 1035 acpi_dev->driver = acpi_drv; 1036 1037 pr_debug("Driver [%s] successfully bound to device [%s]\n", 1038 acpi_drv->name, acpi_dev->pnp.bus_id); 1039 1040 if (acpi_drv->ops.notify) { 1041 ret = acpi_device_install_notify_handler(acpi_dev); 1042 if (ret) { 1043 if (acpi_drv->ops.remove) 1044 acpi_drv->ops.remove(acpi_dev); 1045 1046 acpi_dev->driver = NULL; 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 = acpi_dev->driver; 1063 1064 if (acpi_drv) { 1065 if (acpi_drv->ops.notify) 1066 acpi_device_remove_notify_handler(acpi_dev); 1067 if (acpi_drv->ops.remove) 1068 acpi_drv->ops.remove(acpi_dev); 1069 } 1070 acpi_dev->driver = NULL; 1071 acpi_dev->driver_data = NULL; 1072 1073 put_device(dev); 1074 } 1075 1076 struct bus_type acpi_bus_type = { 1077 .name = "acpi", 1078 .match = acpi_bus_match, 1079 .probe = acpi_device_probe, 1080 .remove = acpi_device_remove, 1081 .uevent = acpi_device_uevent, 1082 }; 1083 1084 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1085 { 1086 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1087 } 1088 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1089 1090 struct acpi_dev_walk_context { 1091 int (*fn)(struct acpi_device *, void *); 1092 void *data; 1093 }; 1094 1095 static int acpi_dev_for_one_check(struct device *dev, void *context) 1096 { 1097 struct acpi_dev_walk_context *adwc = context; 1098 1099 if (dev->bus != &acpi_bus_type) 1100 return 0; 1101 1102 return adwc->fn(to_acpi_device(dev), adwc->data); 1103 } 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 /* -------------------------------------------------------------------------- 1117 Initialization/Cleanup 1118 -------------------------------------------------------------------------- */ 1119 1120 static int __init acpi_bus_init_irq(void) 1121 { 1122 acpi_status status; 1123 char *message = NULL; 1124 1125 1126 /* 1127 * Let the system know what interrupt model we are using by 1128 * evaluating the \_PIC object, if exists. 1129 */ 1130 1131 switch (acpi_irq_model) { 1132 case ACPI_IRQ_MODEL_PIC: 1133 message = "PIC"; 1134 break; 1135 case ACPI_IRQ_MODEL_IOAPIC: 1136 message = "IOAPIC"; 1137 break; 1138 case ACPI_IRQ_MODEL_IOSAPIC: 1139 message = "IOSAPIC"; 1140 break; 1141 case ACPI_IRQ_MODEL_GIC: 1142 message = "GIC"; 1143 break; 1144 case ACPI_IRQ_MODEL_PLATFORM: 1145 message = "platform specific model"; 1146 break; 1147 default: 1148 pr_info("Unknown interrupt routing model\n"); 1149 return -ENODEV; 1150 } 1151 1152 pr_info("Using %s for interrupt routing\n", message); 1153 1154 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1155 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1156 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1157 return -ENODEV; 1158 } 1159 1160 return 0; 1161 } 1162 1163 /** 1164 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1165 * 1166 * The ACPI tables are accessible after this, but the handling of events has not 1167 * been initialized and the global lock is not available yet, so AML should not 1168 * be executed at this point. 1169 * 1170 * Doing this before switching the EFI runtime services to virtual mode allows 1171 * the EfiBootServices memory to be freed slightly earlier on boot. 1172 */ 1173 void __init acpi_early_init(void) 1174 { 1175 acpi_status status; 1176 1177 if (acpi_disabled) 1178 return; 1179 1180 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1181 1182 /* enable workarounds, unless strict ACPI spec. compliance */ 1183 if (!acpi_strict) 1184 acpi_gbl_enable_interpreter_slack = TRUE; 1185 1186 acpi_permanent_mmap = true; 1187 1188 #ifdef CONFIG_X86 1189 /* 1190 * If the machine falls into the DMI check table, 1191 * DSDT will be copied to memory. 1192 * Note that calling dmi_check_system() here on other architectures 1193 * would not be OK because only x86 initializes dmi early enough. 1194 * Thankfully only x86 systems need such quirks for now. 1195 */ 1196 dmi_check_system(dsdt_dmi_table); 1197 #endif 1198 1199 status = acpi_reallocate_root_table(); 1200 if (ACPI_FAILURE(status)) { 1201 pr_err("Unable to reallocate ACPI tables\n"); 1202 goto error0; 1203 } 1204 1205 status = acpi_initialize_subsystem(); 1206 if (ACPI_FAILURE(status)) { 1207 pr_err("Unable to initialize the ACPI Interpreter\n"); 1208 goto error0; 1209 } 1210 1211 #ifdef CONFIG_X86 1212 if (!acpi_ioapic) { 1213 /* compatible (0) means level (3) */ 1214 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1215 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1216 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1217 } 1218 /* Set PIC-mode SCI trigger type */ 1219 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1220 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1221 } else { 1222 /* 1223 * now that acpi_gbl_FADT is initialized, 1224 * update it with result from INT_SRC_OVR parsing 1225 */ 1226 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1227 } 1228 #endif 1229 return; 1230 1231 error0: 1232 disable_acpi(); 1233 } 1234 1235 /** 1236 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1237 * 1238 * Switch over the platform to the ACPI mode (if possible). 1239 * 1240 * Doing this too early is generally unsafe, but at the same time it needs to be 1241 * done before all things that really depend on ACPI. The right spot appears to 1242 * be before finalizing the EFI initialization. 1243 */ 1244 void __init acpi_subsystem_init(void) 1245 { 1246 acpi_status status; 1247 1248 if (acpi_disabled) 1249 return; 1250 1251 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1252 if (ACPI_FAILURE(status)) { 1253 pr_err("Unable to enable ACPI\n"); 1254 disable_acpi(); 1255 } else { 1256 /* 1257 * If the system is using ACPI then we can be reasonably 1258 * confident that any regulators are managed by the firmware 1259 * so tell the regulator core it has everything it needs to 1260 * know. 1261 */ 1262 regulator_has_full_constraints(); 1263 } 1264 } 1265 1266 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1267 { 1268 if (event == ACPI_TABLE_EVENT_LOAD) 1269 acpi_scan_table_notify(); 1270 1271 return acpi_sysfs_table_handler(event, table, context); 1272 } 1273 1274 static int __init acpi_bus_init(void) 1275 { 1276 int result; 1277 acpi_status status; 1278 1279 acpi_os_initialize1(); 1280 1281 status = acpi_load_tables(); 1282 if (ACPI_FAILURE(status)) { 1283 pr_err("Unable to load the System Description Tables\n"); 1284 goto error1; 1285 } 1286 1287 /* 1288 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1289 * device is found in the namespace. 1290 * 1291 * This is accomplished by looking for the ECDT table and getting the EC 1292 * parameters out of that. 1293 * 1294 * Do that before calling acpi_initialize_objects() which may trigger EC 1295 * address space accesses. 1296 */ 1297 acpi_ec_ecdt_probe(); 1298 1299 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1300 if (ACPI_FAILURE(status)) { 1301 pr_err("Unable to start the ACPI Interpreter\n"); 1302 goto error1; 1303 } 1304 1305 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1306 if (ACPI_FAILURE(status)) { 1307 pr_err("Unable to initialize ACPI objects\n"); 1308 goto error1; 1309 } 1310 1311 /* Set capability bits for _OSC under processor scope */ 1312 acpi_early_processor_osc(); 1313 1314 /* 1315 * _OSC method may exist in module level code, 1316 * so it must be run after ACPI_FULL_INITIALIZATION 1317 */ 1318 acpi_bus_osc_negotiate_platform_control(); 1319 acpi_bus_osc_negotiate_usb_control(); 1320 1321 /* 1322 * _PDC control method may load dynamic SSDT tables, 1323 * and we need to install the table handler before that. 1324 */ 1325 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1326 1327 acpi_sysfs_init(); 1328 1329 acpi_early_processor_set_pdc(); 1330 1331 /* 1332 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1333 * is necessary to enable it as early as possible. 1334 */ 1335 acpi_ec_dsdt_probe(); 1336 1337 pr_info("Interpreter enabled\n"); 1338 1339 /* Initialize sleep structures */ 1340 acpi_sleep_init(); 1341 1342 /* 1343 * Get the system interrupt model and evaluate \_PIC. 1344 */ 1345 result = acpi_bus_init_irq(); 1346 if (result) 1347 goto error1; 1348 1349 /* 1350 * Register the for all standard device notifications. 1351 */ 1352 status = 1353 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1354 &acpi_bus_notify, NULL); 1355 if (ACPI_FAILURE(status)) { 1356 pr_err("Unable to register for system notifications\n"); 1357 goto error1; 1358 } 1359 1360 /* 1361 * Create the top ACPI proc directory 1362 */ 1363 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1364 1365 result = bus_register(&acpi_bus_type); 1366 if (!result) 1367 return 0; 1368 1369 /* Mimic structured exception handling */ 1370 error1: 1371 acpi_terminate(); 1372 return -ENODEV; 1373 } 1374 1375 struct kobject *acpi_kobj; 1376 EXPORT_SYMBOL_GPL(acpi_kobj); 1377 1378 static int __init acpi_init(void) 1379 { 1380 int result; 1381 1382 if (acpi_disabled) { 1383 pr_info("Interpreter disabled.\n"); 1384 return -ENODEV; 1385 } 1386 1387 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1388 if (!acpi_kobj) 1389 pr_debug("%s: kset create error\n", __func__); 1390 1391 init_prmt(); 1392 acpi_init_pcc(); 1393 result = acpi_bus_init(); 1394 if (result) { 1395 kobject_put(acpi_kobj); 1396 disable_acpi(); 1397 return result; 1398 } 1399 1400 pci_mmcfg_late_init(); 1401 acpi_iort_init(); 1402 acpi_hest_init(); 1403 acpi_ghes_init(); 1404 acpi_scan_init(); 1405 acpi_ec_init(); 1406 acpi_debugfs_init(); 1407 acpi_sleep_proc_init(); 1408 acpi_wakeup_device_init(); 1409 acpi_debugger_init(); 1410 acpi_setup_sb_notify_handler(); 1411 acpi_viot_init(); 1412 acpi_agdi_init(); 1413 return 0; 1414 } 1415 1416 subsys_initcall(acpi_init); 1417