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_viot.h> 30 #include <linux/pci.h> 31 #include <acpi/apei.h> 32 #include <linux/suspend.h> 33 #include <linux/prmt.h> 34 35 #include "internal.h" 36 37 struct acpi_device *acpi_root; 38 struct proc_dir_entry *acpi_root_dir; 39 EXPORT_SYMBOL(acpi_root_dir); 40 41 #ifdef CONFIG_X86 42 #ifdef CONFIG_ACPI_CUSTOM_DSDT 43 static inline int set_copy_dsdt(const struct dmi_system_id *id) 44 { 45 return 0; 46 } 47 #else 48 static int set_copy_dsdt(const struct dmi_system_id *id) 49 { 50 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident); 51 acpi_gbl_copy_dsdt_locally = 1; 52 return 0; 53 } 54 #endif 55 56 static const struct dmi_system_id dsdt_dmi_table[] __initconst = { 57 /* 58 * Invoke DSDT corruption work-around on all Toshiba Satellite. 59 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 60 */ 61 { 62 .callback = set_copy_dsdt, 63 .ident = "TOSHIBA Satellite", 64 .matches = { 65 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 66 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 67 }, 68 }, 69 {} 70 }; 71 #endif 72 73 /* -------------------------------------------------------------------------- 74 Device Management 75 -------------------------------------------------------------------------- */ 76 77 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 78 unsigned long long *sta) 79 { 80 acpi_status status; 81 82 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 83 if (ACPI_SUCCESS(status)) 84 return AE_OK; 85 86 if (status == AE_NOT_FOUND) { 87 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 88 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 89 return AE_OK; 90 } 91 return status; 92 } 93 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle); 94 95 int acpi_bus_get_status(struct acpi_device *device) 96 { 97 acpi_status status; 98 unsigned long long sta; 99 100 if (acpi_device_override_status(device, &sta)) { 101 acpi_set_device_status(device, sta); 102 return 0; 103 } 104 105 /* Battery devices must have their deps met before calling _STA */ 106 if (acpi_device_is_battery(device) && device->dep_unmet) { 107 acpi_set_device_status(device, 0); 108 return 0; 109 } 110 111 status = acpi_bus_get_status_handle(device->handle, &sta); 112 if (ACPI_FAILURE(status)) 113 return -ENODEV; 114 115 acpi_set_device_status(device, sta); 116 117 if (device->status.functional && !device->status.present) { 118 pr_debug("Device [%s] status [%08x]: functional but not present\n", 119 device->pnp.bus_id, (u32)sta); 120 } 121 122 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta); 123 return 0; 124 } 125 EXPORT_SYMBOL(acpi_bus_get_status); 126 127 void acpi_bus_private_data_handler(acpi_handle handle, 128 void *context) 129 { 130 return; 131 } 132 EXPORT_SYMBOL(acpi_bus_private_data_handler); 133 134 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 135 { 136 acpi_status status; 137 138 status = acpi_attach_data(handle, 139 acpi_bus_private_data_handler, data); 140 if (ACPI_FAILURE(status)) { 141 acpi_handle_debug(handle, "Error attaching device data\n"); 142 return -ENODEV; 143 } 144 145 return 0; 146 } 147 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 148 149 int acpi_bus_get_private_data(acpi_handle handle, void **data) 150 { 151 acpi_status status; 152 153 if (!data) 154 return -EINVAL; 155 156 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 157 if (ACPI_FAILURE(status)) { 158 acpi_handle_debug(handle, "No context for object\n"); 159 return -ENODEV; 160 } 161 162 return 0; 163 } 164 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 165 166 void acpi_bus_detach_private_data(acpi_handle handle) 167 { 168 acpi_detach_data(handle, acpi_bus_private_data_handler); 169 } 170 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 171 172 static void acpi_print_osc_error(acpi_handle handle, 173 struct acpi_osc_context *context, char *error) 174 { 175 int i; 176 177 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); 178 179 pr_debug("_OSC request data:"); 180 for (i = 0; i < context->cap.length; i += sizeof(u32)) 181 pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); 182 183 pr_debug("\n"); 184 } 185 186 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 187 { 188 acpi_status status; 189 struct acpi_object_list input; 190 union acpi_object in_params[4]; 191 union acpi_object *out_obj; 192 guid_t guid; 193 u32 errors; 194 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 195 196 if (!context) 197 return AE_ERROR; 198 if (guid_parse(context->uuid_str, &guid)) 199 return AE_ERROR; 200 context->ret.length = ACPI_ALLOCATE_BUFFER; 201 context->ret.pointer = NULL; 202 203 /* Setting up input parameters */ 204 input.count = 4; 205 input.pointer = in_params; 206 in_params[0].type = ACPI_TYPE_BUFFER; 207 in_params[0].buffer.length = 16; 208 in_params[0].buffer.pointer = (u8 *)&guid; 209 in_params[1].type = ACPI_TYPE_INTEGER; 210 in_params[1].integer.value = context->rev; 211 in_params[2].type = ACPI_TYPE_INTEGER; 212 in_params[2].integer.value = context->cap.length/sizeof(u32); 213 in_params[3].type = ACPI_TYPE_BUFFER; 214 in_params[3].buffer.length = context->cap.length; 215 in_params[3].buffer.pointer = context->cap.pointer; 216 217 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 218 if (ACPI_FAILURE(status)) 219 return status; 220 221 if (!output.length) 222 return AE_NULL_OBJECT; 223 224 out_obj = output.pointer; 225 if (out_obj->type != ACPI_TYPE_BUFFER 226 || out_obj->buffer.length != context->cap.length) { 227 acpi_print_osc_error(handle, context, 228 "_OSC evaluation returned wrong type"); 229 status = AE_TYPE; 230 goto out_kfree; 231 } 232 /* Need to ignore the bit0 in result code */ 233 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 234 if (errors) { 235 if (errors & OSC_REQUEST_ERROR) 236 acpi_print_osc_error(handle, context, 237 "_OSC request failed"); 238 if (errors & OSC_INVALID_UUID_ERROR) 239 acpi_print_osc_error(handle, context, 240 "_OSC invalid UUID"); 241 if (errors & OSC_INVALID_REVISION_ERROR) 242 acpi_print_osc_error(handle, context, 243 "_OSC invalid revision"); 244 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 245 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 246 & OSC_QUERY_ENABLE) 247 goto out_success; 248 status = AE_SUPPORT; 249 goto out_kfree; 250 } 251 status = AE_ERROR; 252 goto out_kfree; 253 } 254 out_success: 255 context->ret.length = out_obj->buffer.length; 256 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 257 context->ret.length, GFP_KERNEL); 258 if (!context->ret.pointer) { 259 status = AE_NO_MEMORY; 260 goto out_kfree; 261 } 262 status = AE_OK; 263 264 out_kfree: 265 kfree(output.pointer); 266 return status; 267 } 268 EXPORT_SYMBOL(acpi_run_osc); 269 270 bool osc_sb_apei_support_acked; 271 272 /* 273 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 274 * OSPM supports platform coordinated low power idle(LPI) states 275 */ 276 bool osc_pc_lpi_support_confirmed; 277 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 278 279 /* 280 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': 281 * Starting with ACPI Specification 6.2, all _CPC registers can be in 282 * PCC, System Memory, System IO, or Functional Fixed Hardware address 283 * spaces. OSPM support for this more flexible register space scheme is 284 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. 285 * 286 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: 287 * - PCC or Functional Fixed Hardware address space if defined 288 * - SystemMemory address space (NULL register) if not defined 289 */ 290 bool osc_cpc_flexible_adr_space_confirmed; 291 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); 292 293 /* 294 * ACPI 6.4 Operating System Capabilities for USB. 295 */ 296 bool osc_sb_native_usb4_support_confirmed; 297 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); 298 299 bool osc_sb_cppc2_support_acked; 300 301 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 302 static void acpi_bus_osc_negotiate_platform_control(void) 303 { 304 u32 capbuf[2], *capbuf_ret; 305 struct acpi_osc_context context = { 306 .uuid_str = sb_uuid_str, 307 .rev = 1, 308 .cap.length = 8, 309 .cap.pointer = capbuf, 310 }; 311 acpi_handle handle; 312 313 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 314 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 315 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 317 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 319 320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; 322 if (IS_ENABLED(CONFIG_ACPI_PRMT)) 323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT; 324 if (IS_ENABLED(CONFIG_ACPI_FFH)) 325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_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], *capbuf_ret; 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 /* 432 * Run _OSC first with query bit set, trying to get control over 433 * all tunneling. The platform can then clear out bits in the 434 * control dword that it does not want to grant to the OS. 435 */ 436 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 437 capbuf[OSC_SUPPORT_DWORD] = 0; 438 capbuf[OSC_CONTROL_DWORD] = control; 439 440 status = acpi_run_osc(handle, &context); 441 if (ACPI_FAILURE(status)) 442 return; 443 444 if (context.ret.length != sizeof(capbuf)) { 445 pr_info("USB4 _OSC: returned invalid length buffer\n"); 446 goto out_free; 447 } 448 449 /* 450 * Run _OSC again now with query bit clear and the control dword 451 * matching what the platform granted (which may not have all 452 * the control bits set). 453 */ 454 capbuf_ret = context.ret.pointer; 455 456 capbuf[OSC_QUERY_DWORD] = 0; 457 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD]; 458 459 kfree(context.ret.pointer); 460 461 status = acpi_run_osc(handle, &context); 462 if (ACPI_FAILURE(status)) 463 return; 464 465 if (context.ret.length != sizeof(capbuf)) { 466 pr_info("USB4 _OSC: returned invalid length buffer\n"); 467 goto out_free; 468 } 469 470 osc_sb_native_usb4_control = 471 control & acpi_osc_ctx_get_pci_control(&context); 472 473 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 474 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", 475 osc_sb_native_usb4_control); 476 477 out_free: 478 kfree(context.ret.pointer); 479 } 480 481 /* -------------------------------------------------------------------------- 482 Notification Handling 483 -------------------------------------------------------------------------- */ 484 485 /** 486 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler 487 * @handle: Target ACPI object. 488 * @type: Notification type. 489 * @data: Ignored. 490 * 491 * This only handles notifications related to device hotplug. 492 */ 493 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 494 { 495 struct acpi_device *adev; 496 497 switch (type) { 498 case ACPI_NOTIFY_BUS_CHECK: 499 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 500 break; 501 502 case ACPI_NOTIFY_DEVICE_CHECK: 503 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 504 break; 505 506 case ACPI_NOTIFY_DEVICE_WAKE: 507 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 508 return; 509 510 case ACPI_NOTIFY_EJECT_REQUEST: 511 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 512 break; 513 514 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 515 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 516 /* TBD: Exactly what does 'light' mean? */ 517 return; 518 519 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 520 acpi_handle_err(handle, "Device cannot be configured due " 521 "to a frequency mismatch\n"); 522 return; 523 524 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 525 acpi_handle_err(handle, "Device cannot be configured due " 526 "to a bus mode mismatch\n"); 527 return; 528 529 case ACPI_NOTIFY_POWER_FAULT: 530 acpi_handle_err(handle, "Device has suffered a power fault\n"); 531 return; 532 533 default: 534 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 535 return; 536 } 537 538 adev = acpi_get_acpi_dev(handle); 539 540 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 541 return; 542 543 acpi_put_acpi_dev(adev); 544 545 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); 546 } 547 548 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 549 { 550 struct acpi_device *device = data; 551 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); 552 553 acpi_drv->ops.notify(device, event); 554 } 555 556 static int acpi_device_install_notify_handler(struct acpi_device *device, 557 struct acpi_driver *acpi_drv) 558 { 559 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 560 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 561 acpi_status status; 562 563 status = acpi_install_notify_handler(device->handle, type, 564 acpi_notify_device, device); 565 if (ACPI_FAILURE(status)) 566 return -EINVAL; 567 568 return 0; 569 } 570 571 static void acpi_device_remove_notify_handler(struct acpi_device *device, 572 struct acpi_driver *acpi_drv) 573 { 574 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 575 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 576 577 acpi_remove_notify_handler(device->handle, type, 578 acpi_notify_device); 579 580 acpi_os_wait_events_complete(); 581 } 582 583 int acpi_dev_install_notify_handler(struct acpi_device *adev, 584 u32 handler_type, 585 acpi_notify_handler handler, void *context) 586 { 587 acpi_status status; 588 589 status = acpi_install_notify_handler(adev->handle, handler_type, 590 handler, context); 591 if (ACPI_FAILURE(status)) 592 return -ENODEV; 593 594 return 0; 595 } 596 EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); 597 598 void acpi_dev_remove_notify_handler(struct acpi_device *adev, 599 u32 handler_type, 600 acpi_notify_handler handler) 601 { 602 acpi_remove_notify_handler(adev->handle, handler_type, handler); 603 acpi_os_wait_events_complete(); 604 } 605 EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); 606 607 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 608 609 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 610 #define ACPI_SB_INDICATE_INTERVAL 10000 611 612 static void sb_notify_work(struct work_struct *dummy) 613 { 614 acpi_handle sb_handle; 615 616 orderly_poweroff(true); 617 618 /* 619 * After initiating graceful shutdown, the ACPI spec requires OSPM 620 * to evaluate _OST method once every 10seconds to indicate that 621 * the shutdown is in progress 622 */ 623 acpi_get_handle(NULL, "\\_SB", &sb_handle); 624 while (1) { 625 pr_info("Graceful shutdown in progress.\n"); 626 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 627 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 628 msleep(ACPI_SB_INDICATE_INTERVAL); 629 } 630 } 631 632 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 633 { 634 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 635 636 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 637 if (!work_busy(&acpi_sb_work)) 638 schedule_work(&acpi_sb_work); 639 } else { 640 pr_warn("event %x is not supported by \\_SB device\n", event); 641 } 642 } 643 644 static int __init acpi_setup_sb_notify_handler(void) 645 { 646 acpi_handle sb_handle; 647 648 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 649 return -ENXIO; 650 651 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 652 acpi_sb_notify, NULL))) 653 return -EINVAL; 654 655 return 0; 656 } 657 658 /* -------------------------------------------------------------------------- 659 Device Matching 660 -------------------------------------------------------------------------- */ 661 662 /** 663 * acpi_get_first_physical_node - Get first physical node of an ACPI device 664 * @adev: ACPI device in question 665 * 666 * Return: First physical node of ACPI device @adev 667 */ 668 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 669 { 670 struct mutex *physical_node_lock = &adev->physical_node_lock; 671 struct device *phys_dev; 672 673 mutex_lock(physical_node_lock); 674 if (list_empty(&adev->physical_node_list)) { 675 phys_dev = NULL; 676 } else { 677 const struct acpi_device_physical_node *node; 678 679 node = list_first_entry(&adev->physical_node_list, 680 struct acpi_device_physical_node, node); 681 682 phys_dev = node->dev; 683 } 684 mutex_unlock(physical_node_lock); 685 return phys_dev; 686 } 687 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 688 689 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 690 const struct device *dev) 691 { 692 const struct device *phys_dev = acpi_get_first_physical_node(adev); 693 694 return phys_dev && phys_dev == dev ? adev : NULL; 695 } 696 697 /** 698 * acpi_device_is_first_physical_node - Is given dev first physical node 699 * @adev: ACPI companion device 700 * @dev: Physical device to check 701 * 702 * Function checks if given @dev is the first physical devices attached to 703 * the ACPI companion device. This distinction is needed in some cases 704 * where the same companion device is shared between many physical devices. 705 * 706 * Note that the caller have to provide valid @adev pointer. 707 */ 708 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 709 const struct device *dev) 710 { 711 return !!acpi_primary_dev_companion(adev, dev); 712 } 713 714 /* 715 * acpi_companion_match() - Can we match via ACPI companion device 716 * @dev: Device in question 717 * 718 * Check if the given device has an ACPI companion and if that companion has 719 * a valid list of PNP IDs, and if the device is the first (primary) physical 720 * device associated with it. Return the companion pointer if that's the case 721 * or NULL otherwise. 722 * 723 * If multiple physical devices are attached to a single ACPI companion, we need 724 * to be careful. The usage scenario for this kind of relationship is that all 725 * of the physical devices in question use resources provided by the ACPI 726 * companion. A typical case is an MFD device where all the sub-devices share 727 * the parent's ACPI companion. In such cases we can only allow the primary 728 * (first) physical device to be matched with the help of the companion's PNP 729 * IDs. 730 * 731 * Additional physical devices sharing the ACPI companion can still use 732 * resources available from it but they will be matched normally using functions 733 * provided by their bus types (and analogously for their modalias). 734 */ 735 const struct acpi_device *acpi_companion_match(const struct device *dev) 736 { 737 struct acpi_device *adev; 738 739 adev = ACPI_COMPANION(dev); 740 if (!adev) 741 return NULL; 742 743 if (list_empty(&adev->pnp.ids)) 744 return NULL; 745 746 return acpi_primary_dev_companion(adev, dev); 747 } 748 749 /** 750 * acpi_of_match_device - Match device object using the "compatible" property. 751 * @adev: ACPI device object to match. 752 * @of_match_table: List of device IDs to match against. 753 * @of_id: OF ID if matched 754 * 755 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 756 * identifiers and a _DSD object with the "compatible" property, use that 757 * property to match against the given list of identifiers. 758 */ 759 static bool acpi_of_match_device(const struct acpi_device *adev, 760 const struct of_device_id *of_match_table, 761 const struct of_device_id **of_id) 762 { 763 const union acpi_object *of_compatible, *obj; 764 int i, nval; 765 766 if (!adev) 767 return false; 768 769 of_compatible = adev->data.of_compatible; 770 if (!of_match_table || !of_compatible) 771 return false; 772 773 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 774 nval = of_compatible->package.count; 775 obj = of_compatible->package.elements; 776 } else { /* Must be ACPI_TYPE_STRING. */ 777 nval = 1; 778 obj = of_compatible; 779 } 780 /* Now we can look for the driver DT compatible strings */ 781 for (i = 0; i < nval; i++, obj++) { 782 const struct of_device_id *id; 783 784 for (id = of_match_table; id->compatible[0]; id++) 785 if (!strcasecmp(obj->string.pointer, id->compatible)) { 786 if (of_id) 787 *of_id = id; 788 return true; 789 } 790 } 791 792 return false; 793 } 794 795 static bool acpi_of_modalias(struct acpi_device *adev, 796 char *modalias, size_t len) 797 { 798 const union acpi_object *of_compatible; 799 const union acpi_object *obj; 800 const char *str, *chr; 801 802 of_compatible = adev->data.of_compatible; 803 if (!of_compatible) 804 return false; 805 806 if (of_compatible->type == ACPI_TYPE_PACKAGE) 807 obj = of_compatible->package.elements; 808 else /* Must be ACPI_TYPE_STRING. */ 809 obj = of_compatible; 810 811 str = obj->string.pointer; 812 chr = strchr(str, ','); 813 strscpy(modalias, chr ? chr + 1 : str, len); 814 815 return true; 816 } 817 818 /** 819 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 820 * @adev: ACPI device object to match 821 * @default_id: ID string to use as default if no compatible string found 822 * @modalias: Pointer to buffer that modalias value will be copied into 823 * @len: Length of modalias buffer 824 * 825 * This is a counterpart of of_alias_from_compatible() for struct acpi_device 826 * objects. If there is a compatible string for @adev, it will be copied to 827 * @modalias with the vendor prefix stripped; otherwise, @default_id will be 828 * used. 829 */ 830 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 831 char *modalias, size_t len) 832 { 833 if (!acpi_of_modalias(adev, modalias, len)) 834 strscpy(modalias, default_id, len); 835 } 836 EXPORT_SYMBOL_GPL(acpi_set_modalias); 837 838 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 839 struct acpi_hardware_id *hwid) 840 { 841 int i, msk, byte_shift; 842 char buf[3]; 843 844 if (!id->cls) 845 return false; 846 847 /* Apply class-code bitmask, before checking each class-code byte */ 848 for (i = 1; i <= 3; i++) { 849 byte_shift = 8 * (3 - i); 850 msk = (id->cls_msk >> byte_shift) & 0xFF; 851 if (!msk) 852 continue; 853 854 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 855 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 856 return false; 857 } 858 return true; 859 } 860 861 static bool __acpi_match_device(const struct acpi_device *device, 862 const struct acpi_device_id *acpi_ids, 863 const struct of_device_id *of_ids, 864 const struct acpi_device_id **acpi_id, 865 const struct of_device_id **of_id) 866 { 867 const struct acpi_device_id *id; 868 struct acpi_hardware_id *hwid; 869 870 /* 871 * If the device is not present, it is unnecessary to load device 872 * driver for it. 873 */ 874 if (!device || !device->status.present) 875 return false; 876 877 list_for_each_entry(hwid, &device->pnp.ids, list) { 878 /* First, check the ACPI/PNP IDs provided by the caller. */ 879 if (acpi_ids) { 880 for (id = acpi_ids; id->id[0] || id->cls; id++) { 881 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 882 goto out_acpi_match; 883 if (id->cls && __acpi_match_device_cls(id, hwid)) 884 goto out_acpi_match; 885 } 886 } 887 888 /* 889 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 890 * "compatible" property if found. 891 */ 892 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 893 return acpi_of_match_device(device, of_ids, of_id); 894 } 895 return false; 896 897 out_acpi_match: 898 if (acpi_id) 899 *acpi_id = id; 900 return true; 901 } 902 903 /** 904 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs 905 * @ids: Array of struct acpi_device_id objects to match against. 906 * @adev: The ACPI device pointer to match. 907 * 908 * Match the ACPI device @adev against a given list of ACPI IDs @ids. 909 * 910 * Return: 911 * a pointer to the first matching ACPI ID on success or %NULL on failure. 912 */ 913 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, 914 const struct acpi_device *adev) 915 { 916 const struct acpi_device_id *id = NULL; 917 918 __acpi_match_device(adev, ids, NULL, &id, NULL); 919 return id; 920 } 921 EXPORT_SYMBOL_GPL(acpi_match_acpi_device); 922 923 /** 924 * acpi_match_device - Match a struct device against a given list of ACPI IDs 925 * @ids: Array of struct acpi_device_id object to match against. 926 * @dev: The device structure to match. 927 * 928 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 929 * object for that handle and use that object to match against a given list of 930 * device IDs. 931 * 932 * Return a pointer to the first matching ID on success or %NULL on failure. 933 */ 934 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 935 const struct device *dev) 936 { 937 return acpi_match_acpi_device(ids, acpi_companion_match(dev)); 938 } 939 EXPORT_SYMBOL_GPL(acpi_match_device); 940 941 static const void *acpi_of_device_get_match_data(const struct device *dev) 942 { 943 struct acpi_device *adev = ACPI_COMPANION(dev); 944 const struct of_device_id *match = NULL; 945 946 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 947 return NULL; 948 949 return match->data; 950 } 951 952 const void *acpi_device_get_match_data(const struct device *dev) 953 { 954 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; 955 const struct acpi_device_id *match; 956 957 if (!acpi_ids) 958 return acpi_of_device_get_match_data(dev); 959 960 match = acpi_match_device(acpi_ids, dev); 961 if (!match) 962 return NULL; 963 964 return (const void *)match->driver_data; 965 } 966 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 967 968 int acpi_match_device_ids(struct acpi_device *device, 969 const struct acpi_device_id *ids) 970 { 971 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 972 } 973 EXPORT_SYMBOL(acpi_match_device_ids); 974 975 bool acpi_driver_match_device(struct device *dev, 976 const struct device_driver *drv) 977 { 978 const struct acpi_device_id *acpi_ids = drv->acpi_match_table; 979 const struct of_device_id *of_ids = drv->of_match_table; 980 981 if (!acpi_ids) 982 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL); 983 984 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); 985 } 986 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 987 988 /* -------------------------------------------------------------------------- 989 ACPI Driver Management 990 -------------------------------------------------------------------------- */ 991 992 /** 993 * acpi_bus_register_driver - register a driver with the ACPI bus 994 * @driver: driver being registered 995 * 996 * Registers a driver with the ACPI bus. Searches the namespace for all 997 * devices that match the driver's criteria and binds. Returns zero for 998 * success or a negative error status for failure. 999 */ 1000 int acpi_bus_register_driver(struct acpi_driver *driver) 1001 { 1002 if (acpi_disabled) 1003 return -ENODEV; 1004 driver->drv.name = driver->name; 1005 driver->drv.bus = &acpi_bus_type; 1006 driver->drv.owner = driver->owner; 1007 1008 return driver_register(&driver->drv); 1009 } 1010 1011 EXPORT_SYMBOL(acpi_bus_register_driver); 1012 1013 /** 1014 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 1015 * @driver: driver to unregister 1016 * 1017 * Unregisters a driver with the ACPI bus. Searches the namespace for all 1018 * devices that match the driver's criteria and unbinds. 1019 */ 1020 void acpi_bus_unregister_driver(struct acpi_driver *driver) 1021 { 1022 driver_unregister(&driver->drv); 1023 } 1024 1025 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1026 1027 /* -------------------------------------------------------------------------- 1028 ACPI Bus operations 1029 -------------------------------------------------------------------------- */ 1030 1031 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 1032 { 1033 struct acpi_device *acpi_dev = to_acpi_device(dev); 1034 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1035 1036 return acpi_dev->flags.match_driver 1037 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1038 } 1039 1040 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) 1041 { 1042 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1043 } 1044 1045 static int acpi_device_probe(struct device *dev) 1046 { 1047 struct acpi_device *acpi_dev = to_acpi_device(dev); 1048 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1049 int ret; 1050 1051 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1052 return -EINVAL; 1053 1054 if (!acpi_drv->ops.add) 1055 return -ENOSYS; 1056 1057 ret = acpi_drv->ops.add(acpi_dev); 1058 if (ret) { 1059 acpi_dev->driver_data = NULL; 1060 return ret; 1061 } 1062 1063 pr_debug("Driver [%s] successfully bound to device [%s]\n", 1064 acpi_drv->name, acpi_dev->pnp.bus_id); 1065 1066 if (acpi_drv->ops.notify) { 1067 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv); 1068 if (ret) { 1069 if (acpi_drv->ops.remove) 1070 acpi_drv->ops.remove(acpi_dev); 1071 1072 acpi_dev->driver_data = NULL; 1073 return ret; 1074 } 1075 } 1076 1077 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, 1078 acpi_dev->pnp.bus_id); 1079 1080 get_device(dev); 1081 return 0; 1082 } 1083 1084 static void acpi_device_remove(struct device *dev) 1085 { 1086 struct acpi_device *acpi_dev = to_acpi_device(dev); 1087 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1088 1089 if (acpi_drv->ops.notify) 1090 acpi_device_remove_notify_handler(acpi_dev, acpi_drv); 1091 1092 if (acpi_drv->ops.remove) 1093 acpi_drv->ops.remove(acpi_dev); 1094 1095 acpi_dev->driver_data = NULL; 1096 1097 put_device(dev); 1098 } 1099 1100 const struct bus_type acpi_bus_type = { 1101 .name = "acpi", 1102 .match = acpi_bus_match, 1103 .probe = acpi_device_probe, 1104 .remove = acpi_device_remove, 1105 .uevent = acpi_device_uevent, 1106 }; 1107 1108 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1109 { 1110 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1111 } 1112 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1113 1114 struct acpi_dev_walk_context { 1115 int (*fn)(struct acpi_device *, void *); 1116 void *data; 1117 }; 1118 1119 static int acpi_dev_for_one_check(struct device *dev, void *context) 1120 { 1121 struct acpi_dev_walk_context *adwc = context; 1122 1123 if (dev->bus != &acpi_bus_type) 1124 return 0; 1125 1126 return adwc->fn(to_acpi_device(dev), adwc->data); 1127 } 1128 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); 1129 1130 int acpi_dev_for_each_child(struct acpi_device *adev, 1131 int (*fn)(struct acpi_device *, void *), void *data) 1132 { 1133 struct acpi_dev_walk_context adwc = { 1134 .fn = fn, 1135 .data = data, 1136 }; 1137 1138 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1139 } 1140 1141 int acpi_dev_for_each_child_reverse(struct acpi_device *adev, 1142 int (*fn)(struct acpi_device *, void *), 1143 void *data) 1144 { 1145 struct acpi_dev_walk_context adwc = { 1146 .fn = fn, 1147 .data = data, 1148 }; 1149 1150 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); 1151 } 1152 1153 /* -------------------------------------------------------------------------- 1154 Initialization/Cleanup 1155 -------------------------------------------------------------------------- */ 1156 1157 static int __init acpi_bus_init_irq(void) 1158 { 1159 acpi_status status; 1160 char *message = NULL; 1161 1162 1163 /* 1164 * Let the system know what interrupt model we are using by 1165 * evaluating the \_PIC object, if exists. 1166 */ 1167 1168 switch (acpi_irq_model) { 1169 case ACPI_IRQ_MODEL_PIC: 1170 message = "PIC"; 1171 break; 1172 case ACPI_IRQ_MODEL_IOAPIC: 1173 message = "IOAPIC"; 1174 break; 1175 case ACPI_IRQ_MODEL_IOSAPIC: 1176 message = "IOSAPIC"; 1177 break; 1178 case ACPI_IRQ_MODEL_GIC: 1179 message = "GIC"; 1180 break; 1181 case ACPI_IRQ_MODEL_PLATFORM: 1182 message = "platform specific model"; 1183 break; 1184 case ACPI_IRQ_MODEL_LPIC: 1185 message = "LPIC"; 1186 break; 1187 default: 1188 pr_info("Unknown interrupt routing model\n"); 1189 return -ENODEV; 1190 } 1191 1192 pr_info("Using %s for interrupt routing\n", message); 1193 1194 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1195 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1196 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1197 return -ENODEV; 1198 } 1199 1200 return 0; 1201 } 1202 1203 /** 1204 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1205 * 1206 * The ACPI tables are accessible after this, but the handling of events has not 1207 * been initialized and the global lock is not available yet, so AML should not 1208 * be executed at this point. 1209 * 1210 * Doing this before switching the EFI runtime services to virtual mode allows 1211 * the EfiBootServices memory to be freed slightly earlier on boot. 1212 */ 1213 void __init acpi_early_init(void) 1214 { 1215 acpi_status status; 1216 1217 if (acpi_disabled) 1218 return; 1219 1220 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1221 1222 /* enable workarounds, unless strict ACPI spec. compliance */ 1223 if (!acpi_strict) 1224 acpi_gbl_enable_interpreter_slack = TRUE; 1225 1226 acpi_permanent_mmap = true; 1227 1228 #ifdef CONFIG_X86 1229 /* 1230 * If the machine falls into the DMI check table, 1231 * DSDT will be copied to memory. 1232 * Note that calling dmi_check_system() here on other architectures 1233 * would not be OK because only x86 initializes dmi early enough. 1234 * Thankfully only x86 systems need such quirks for now. 1235 */ 1236 dmi_check_system(dsdt_dmi_table); 1237 #endif 1238 1239 status = acpi_reallocate_root_table(); 1240 if (ACPI_FAILURE(status)) { 1241 pr_err("Unable to reallocate ACPI tables\n"); 1242 goto error0; 1243 } 1244 1245 status = acpi_initialize_subsystem(); 1246 if (ACPI_FAILURE(status)) { 1247 pr_err("Unable to initialize the ACPI Interpreter\n"); 1248 goto error0; 1249 } 1250 1251 #ifdef CONFIG_X86 1252 if (!acpi_ioapic) { 1253 /* compatible (0) means level (3) */ 1254 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1255 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1256 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1257 } 1258 /* Set PIC-mode SCI trigger type */ 1259 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1260 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1261 } else { 1262 /* 1263 * now that acpi_gbl_FADT is initialized, 1264 * update it with result from INT_SRC_OVR parsing 1265 */ 1266 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1267 } 1268 #endif 1269 return; 1270 1271 error0: 1272 disable_acpi(); 1273 } 1274 1275 /** 1276 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1277 * 1278 * Switch over the platform to the ACPI mode (if possible). 1279 * 1280 * Doing this too early is generally unsafe, but at the same time it needs to be 1281 * done before all things that really depend on ACPI. The right spot appears to 1282 * be before finalizing the EFI initialization. 1283 */ 1284 void __init acpi_subsystem_init(void) 1285 { 1286 acpi_status status; 1287 1288 if (acpi_disabled) 1289 return; 1290 1291 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1292 if (ACPI_FAILURE(status)) { 1293 pr_err("Unable to enable ACPI\n"); 1294 disable_acpi(); 1295 } else { 1296 /* 1297 * If the system is using ACPI then we can be reasonably 1298 * confident that any regulators are managed by the firmware 1299 * so tell the regulator core it has everything it needs to 1300 * know. 1301 */ 1302 regulator_has_full_constraints(); 1303 } 1304 } 1305 1306 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1307 { 1308 if (event == ACPI_TABLE_EVENT_LOAD) 1309 acpi_scan_table_notify(); 1310 1311 return acpi_sysfs_table_handler(event, table, context); 1312 } 1313 1314 static int __init acpi_bus_init(void) 1315 { 1316 int result; 1317 acpi_status status; 1318 1319 acpi_os_initialize1(); 1320 1321 status = acpi_load_tables(); 1322 if (ACPI_FAILURE(status)) { 1323 pr_err("Unable to load the System Description Tables\n"); 1324 goto error1; 1325 } 1326 1327 /* 1328 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1329 * device is found in the namespace. 1330 * 1331 * This is accomplished by looking for the ECDT table and getting the EC 1332 * parameters out of that. 1333 * 1334 * Do that before calling acpi_initialize_objects() which may trigger EC 1335 * address space accesses. 1336 */ 1337 acpi_ec_ecdt_probe(); 1338 1339 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1340 if (ACPI_FAILURE(status)) { 1341 pr_err("Unable to start the ACPI Interpreter\n"); 1342 goto error1; 1343 } 1344 1345 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1346 if (ACPI_FAILURE(status)) { 1347 pr_err("Unable to initialize ACPI objects\n"); 1348 goto error1; 1349 } 1350 1351 /* 1352 * _OSC method may exist in module level code, 1353 * so it must be run after ACPI_FULL_INITIALIZATION 1354 */ 1355 acpi_bus_osc_negotiate_platform_control(); 1356 acpi_bus_osc_negotiate_usb_control(); 1357 1358 /* 1359 * _PDC control method may load dynamic SSDT tables, 1360 * and we need to install the table handler before that. 1361 */ 1362 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1363 1364 acpi_sysfs_init(); 1365 1366 acpi_early_processor_control_setup(); 1367 1368 /* 1369 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1370 * is necessary to enable it as early as possible. 1371 */ 1372 acpi_ec_dsdt_probe(); 1373 1374 pr_info("Interpreter enabled\n"); 1375 1376 /* Initialize sleep structures */ 1377 acpi_sleep_init(); 1378 1379 /* 1380 * Get the system interrupt model and evaluate \_PIC. 1381 */ 1382 result = acpi_bus_init_irq(); 1383 if (result) 1384 goto error1; 1385 1386 /* 1387 * Register the for all standard device notifications. 1388 */ 1389 status = 1390 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1391 &acpi_bus_notify, NULL); 1392 if (ACPI_FAILURE(status)) { 1393 pr_err("Unable to register for system notifications\n"); 1394 goto error1; 1395 } 1396 1397 /* 1398 * Create the top ACPI proc directory 1399 */ 1400 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1401 1402 result = bus_register(&acpi_bus_type); 1403 if (!result) 1404 return 0; 1405 1406 /* Mimic structured exception handling */ 1407 error1: 1408 acpi_terminate(); 1409 return -ENODEV; 1410 } 1411 1412 struct kobject *acpi_kobj; 1413 EXPORT_SYMBOL_GPL(acpi_kobj); 1414 1415 static int __init acpi_init(void) 1416 { 1417 int result; 1418 1419 if (acpi_disabled) { 1420 pr_info("Interpreter disabled.\n"); 1421 return -ENODEV; 1422 } 1423 1424 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1425 if (!acpi_kobj) 1426 pr_debug("%s: kset create error\n", __func__); 1427 1428 init_prmt(); 1429 acpi_init_pcc(); 1430 result = acpi_bus_init(); 1431 if (result) { 1432 kobject_put(acpi_kobj); 1433 disable_acpi(); 1434 return result; 1435 } 1436 acpi_init_ffh(); 1437 1438 pci_mmcfg_late_init(); 1439 acpi_viot_early_init(); 1440 acpi_hest_init(); 1441 acpi_ghes_init(); 1442 acpi_arm_init(); 1443 acpi_scan_init(); 1444 acpi_ec_init(); 1445 acpi_debugfs_init(); 1446 acpi_sleep_proc_init(); 1447 acpi_wakeup_device_init(); 1448 acpi_debugger_init(); 1449 acpi_setup_sb_notify_handler(); 1450 acpi_viot_init(); 1451 return 0; 1452 } 1453 1454 subsys_initcall(acpi_init); 1455