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 if (!device->status.present && device->status.enabled) { 116 pr_info(FW_BUG "Device [%s] status [%08x]: not present and enabled\n", 117 device->pnp.bus_id, (u32)sta); 118 device->status.enabled = 0; 119 /* 120 * The status is clearly invalid, so clear the functional bit as 121 * well to avoid attempting to use the device. 122 */ 123 device->status.functional = 0; 124 } 125 126 acpi_set_device_status(device, sta); 127 128 if (device->status.functional && !device->status.present) { 129 pr_debug("Device [%s] status [%08x]: functional but not present\n", 130 device->pnp.bus_id, (u32)sta); 131 } 132 133 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta); 134 return 0; 135 } 136 EXPORT_SYMBOL(acpi_bus_get_status); 137 138 void acpi_bus_private_data_handler(acpi_handle handle, 139 void *context) 140 { 141 return; 142 } 143 EXPORT_SYMBOL(acpi_bus_private_data_handler); 144 145 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 146 { 147 acpi_status status; 148 149 status = acpi_attach_data(handle, 150 acpi_bus_private_data_handler, data); 151 if (ACPI_FAILURE(status)) { 152 acpi_handle_debug(handle, "Error attaching device data\n"); 153 return -ENODEV; 154 } 155 156 return 0; 157 } 158 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 159 160 int acpi_bus_get_private_data(acpi_handle handle, void **data) 161 { 162 acpi_status status; 163 164 if (!data) 165 return -EINVAL; 166 167 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 168 if (ACPI_FAILURE(status)) { 169 acpi_handle_debug(handle, "No context for object\n"); 170 return -ENODEV; 171 } 172 173 return 0; 174 } 175 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 176 177 void acpi_bus_detach_private_data(acpi_handle handle) 178 { 179 acpi_detach_data(handle, acpi_bus_private_data_handler); 180 } 181 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 182 183 static void acpi_print_osc_error(acpi_handle handle, 184 struct acpi_osc_context *context, char *error) 185 { 186 int i; 187 188 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); 189 190 pr_debug("_OSC request data:"); 191 for (i = 0; i < context->cap.length; i += sizeof(u32)) 192 pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); 193 194 pr_debug("\n"); 195 } 196 197 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 198 { 199 acpi_status status; 200 struct acpi_object_list input; 201 union acpi_object in_params[4]; 202 union acpi_object *out_obj; 203 guid_t guid; 204 u32 errors; 205 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 206 207 if (!context) 208 return AE_ERROR; 209 if (guid_parse(context->uuid_str, &guid)) 210 return AE_ERROR; 211 context->ret.length = ACPI_ALLOCATE_BUFFER; 212 context->ret.pointer = NULL; 213 214 /* Setting up input parameters */ 215 input.count = 4; 216 input.pointer = in_params; 217 in_params[0].type = ACPI_TYPE_BUFFER; 218 in_params[0].buffer.length = 16; 219 in_params[0].buffer.pointer = (u8 *)&guid; 220 in_params[1].type = ACPI_TYPE_INTEGER; 221 in_params[1].integer.value = context->rev; 222 in_params[2].type = ACPI_TYPE_INTEGER; 223 in_params[2].integer.value = context->cap.length/sizeof(u32); 224 in_params[3].type = ACPI_TYPE_BUFFER; 225 in_params[3].buffer.length = context->cap.length; 226 in_params[3].buffer.pointer = context->cap.pointer; 227 228 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 229 if (ACPI_FAILURE(status)) 230 return status; 231 232 if (!output.length) 233 return AE_NULL_OBJECT; 234 235 out_obj = output.pointer; 236 if (out_obj->type != ACPI_TYPE_BUFFER 237 || out_obj->buffer.length != context->cap.length) { 238 acpi_print_osc_error(handle, context, 239 "_OSC evaluation returned wrong type"); 240 status = AE_TYPE; 241 goto out_kfree; 242 } 243 /* Need to ignore the bit0 in result code */ 244 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 245 if (errors) { 246 if (errors & OSC_REQUEST_ERROR) 247 acpi_print_osc_error(handle, context, 248 "_OSC request failed"); 249 if (errors & OSC_INVALID_UUID_ERROR) 250 acpi_print_osc_error(handle, context, 251 "_OSC invalid UUID"); 252 if (errors & OSC_INVALID_REVISION_ERROR) 253 acpi_print_osc_error(handle, context, 254 "_OSC invalid revision"); 255 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 256 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 257 & OSC_QUERY_ENABLE) 258 goto out_success; 259 status = AE_SUPPORT; 260 goto out_kfree; 261 } 262 status = AE_ERROR; 263 goto out_kfree; 264 } 265 out_success: 266 context->ret.length = out_obj->buffer.length; 267 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 268 context->ret.length, GFP_KERNEL); 269 if (!context->ret.pointer) { 270 status = AE_NO_MEMORY; 271 goto out_kfree; 272 } 273 status = AE_OK; 274 275 out_kfree: 276 kfree(output.pointer); 277 return status; 278 } 279 EXPORT_SYMBOL(acpi_run_osc); 280 281 bool osc_sb_apei_support_acked; 282 283 /* 284 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 285 * OSPM supports platform coordinated low power idle(LPI) states 286 */ 287 bool osc_pc_lpi_support_confirmed; 288 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 289 290 /* 291 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': 292 * Starting with ACPI Specification 6.2, all _CPC registers can be in 293 * PCC, System Memory, System IO, or Functional Fixed Hardware address 294 * spaces. OSPM support for this more flexible register space scheme is 295 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. 296 * 297 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: 298 * - PCC or Functional Fixed Hardware address space if defined 299 * - SystemMemory address space (NULL register) if not defined 300 */ 301 bool osc_cpc_flexible_adr_space_confirmed; 302 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); 303 304 /* 305 * ACPI 6.4 Operating System Capabilities for USB. 306 */ 307 bool osc_sb_native_usb4_support_confirmed; 308 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); 309 310 bool osc_sb_cppc2_support_acked; 311 312 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 313 static void acpi_bus_osc_negotiate_platform_control(void) 314 { 315 u32 capbuf[2], *capbuf_ret; 316 struct acpi_osc_context context = { 317 .uuid_str = sb_uuid_str, 318 .rev = 1, 319 .cap.length = 8, 320 .cap.pointer = capbuf, 321 }; 322 acpi_handle handle; 323 324 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 325 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 326 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 328 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 329 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 330 if (IS_ENABLED(CONFIG_ACPI_THERMAL)) 331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT; 332 if (IS_ENABLED(CONFIG_ACPI_BATTERY)) 333 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT; 334 335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; 337 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT; 338 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GED_SUPPORT; 339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT; 340 if (IS_ENABLED(CONFIG_ACPI_PRMT)) 341 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT; 342 if (IS_ENABLED(CONFIG_ACPI_FFH)) 343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT; 344 345 #ifdef CONFIG_ARM64 346 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 347 #endif 348 #ifdef CONFIG_X86 349 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 350 #endif 351 352 #ifdef CONFIG_ACPI_CPPC_LIB 353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; 354 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; 355 #endif 356 357 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 358 359 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 360 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 361 362 if (IS_ENABLED(CONFIG_USB4)) 363 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT; 364 365 if (!ghes_disable) 366 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 367 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 368 return; 369 370 if (ACPI_FAILURE(acpi_run_osc(handle, &context))) 371 return; 372 373 capbuf_ret = context.ret.pointer; 374 if (context.ret.length <= OSC_SUPPORT_DWORD) { 375 kfree(context.ret.pointer); 376 return; 377 } 378 379 /* 380 * Now run _OSC again with query flag clear and with the caps 381 * supported by both the OS and the platform. 382 */ 383 capbuf[OSC_QUERY_DWORD] = 0; 384 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD]; 385 kfree(context.ret.pointer); 386 387 if (ACPI_FAILURE(acpi_run_osc(handle, &context))) 388 return; 389 390 capbuf_ret = context.ret.pointer; 391 if (context.ret.length > OSC_SUPPORT_DWORD) { 392 #ifdef CONFIG_ACPI_CPPC_LIB 393 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT; 394 #endif 395 396 osc_sb_apei_support_acked = 397 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 398 osc_pc_lpi_support_confirmed = 399 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; 400 osc_sb_native_usb4_support_confirmed = 401 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; 402 osc_cpc_flexible_adr_space_confirmed = 403 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 404 } 405 406 kfree(context.ret.pointer); 407 } 408 409 /* 410 * Native control of USB4 capabilities. If any of the tunneling bits is 411 * set it means OS is in control and we use software based connection 412 * manager. 413 */ 414 u32 osc_sb_native_usb4_control; 415 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); 416 417 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) 418 { 419 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, 420 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', 421 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', 422 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', 423 (bits & OSC_USB_XDOMAIN) ? '+' : '-'); 424 } 425 426 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; 427 static void acpi_bus_osc_negotiate_usb_control(void) 428 { 429 u32 capbuf[3], *capbuf_ret; 430 struct acpi_osc_context context = { 431 .uuid_str = sb_usb_uuid_str, 432 .rev = 1, 433 .cap.length = sizeof(capbuf), 434 .cap.pointer = capbuf, 435 }; 436 acpi_handle handle; 437 acpi_status status; 438 u32 control; 439 440 if (!osc_sb_native_usb4_support_confirmed) 441 return; 442 443 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 444 return; 445 446 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | 447 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; 448 449 /* 450 * Run _OSC first with query bit set, trying to get control over 451 * all tunneling. The platform can then clear out bits in the 452 * control dword that it does not want to grant to the OS. 453 */ 454 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 455 capbuf[OSC_SUPPORT_DWORD] = 0; 456 capbuf[OSC_CONTROL_DWORD] = control; 457 458 status = acpi_run_osc(handle, &context); 459 if (ACPI_FAILURE(status)) 460 return; 461 462 if (context.ret.length != sizeof(capbuf)) { 463 pr_info("USB4 _OSC: returned invalid length buffer\n"); 464 goto out_free; 465 } 466 467 /* 468 * Run _OSC again now with query bit clear and the control dword 469 * matching what the platform granted (which may not have all 470 * the control bits set). 471 */ 472 capbuf_ret = context.ret.pointer; 473 474 capbuf[OSC_QUERY_DWORD] = 0; 475 capbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD]; 476 477 kfree(context.ret.pointer); 478 479 status = acpi_run_osc(handle, &context); 480 if (ACPI_FAILURE(status)) 481 return; 482 483 if (context.ret.length != sizeof(capbuf)) { 484 pr_info("USB4 _OSC: returned invalid length buffer\n"); 485 goto out_free; 486 } 487 488 osc_sb_native_usb4_control = 489 control & acpi_osc_ctx_get_pci_control(&context); 490 491 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 492 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", 493 osc_sb_native_usb4_control); 494 495 out_free: 496 kfree(context.ret.pointer); 497 } 498 499 /* -------------------------------------------------------------------------- 500 Notification Handling 501 -------------------------------------------------------------------------- */ 502 503 /** 504 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler 505 * @handle: Target ACPI object. 506 * @type: Notification type. 507 * @data: Ignored. 508 * 509 * This only handles notifications related to device hotplug. 510 */ 511 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 512 { 513 struct acpi_device *adev; 514 515 switch (type) { 516 case ACPI_NOTIFY_BUS_CHECK: 517 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 518 break; 519 520 case ACPI_NOTIFY_DEVICE_CHECK: 521 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 522 break; 523 524 case ACPI_NOTIFY_DEVICE_WAKE: 525 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 526 return; 527 528 case ACPI_NOTIFY_EJECT_REQUEST: 529 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 530 break; 531 532 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 533 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 534 /* TBD: Exactly what does 'light' mean? */ 535 return; 536 537 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 538 acpi_handle_err(handle, "Device cannot be configured due " 539 "to a frequency mismatch\n"); 540 return; 541 542 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 543 acpi_handle_err(handle, "Device cannot be configured due " 544 "to a bus mode mismatch\n"); 545 return; 546 547 case ACPI_NOTIFY_POWER_FAULT: 548 acpi_handle_err(handle, "Device has suffered a power fault\n"); 549 return; 550 551 default: 552 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 553 return; 554 } 555 556 adev = acpi_get_acpi_dev(handle); 557 558 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 559 return; 560 561 acpi_put_acpi_dev(adev); 562 563 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); 564 } 565 566 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 567 { 568 struct acpi_device *device = data; 569 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); 570 571 acpi_drv->ops.notify(device, event); 572 } 573 574 static int acpi_device_install_notify_handler(struct acpi_device *device, 575 struct acpi_driver *acpi_drv) 576 { 577 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 578 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 579 acpi_status status; 580 581 status = acpi_install_notify_handler(device->handle, type, 582 acpi_notify_device, device); 583 if (ACPI_FAILURE(status)) 584 return -EINVAL; 585 586 return 0; 587 } 588 589 static void acpi_device_remove_notify_handler(struct acpi_device *device, 590 struct acpi_driver *acpi_drv) 591 { 592 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 593 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 594 595 acpi_remove_notify_handler(device->handle, type, 596 acpi_notify_device); 597 598 acpi_os_wait_events_complete(); 599 } 600 601 int acpi_dev_install_notify_handler(struct acpi_device *adev, 602 u32 handler_type, 603 acpi_notify_handler handler, void *context) 604 { 605 acpi_status status; 606 607 status = acpi_install_notify_handler(adev->handle, handler_type, 608 handler, context); 609 if (ACPI_FAILURE(status)) 610 return -ENODEV; 611 612 return 0; 613 } 614 EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); 615 616 void acpi_dev_remove_notify_handler(struct acpi_device *adev, 617 u32 handler_type, 618 acpi_notify_handler handler) 619 { 620 acpi_remove_notify_handler(adev->handle, handler_type, handler); 621 acpi_os_wait_events_complete(); 622 } 623 EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); 624 625 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 626 627 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 628 #define ACPI_SB_INDICATE_INTERVAL 10000 629 630 static void sb_notify_work(struct work_struct *dummy) 631 { 632 acpi_handle sb_handle; 633 634 orderly_poweroff(true); 635 636 /* 637 * After initiating graceful shutdown, the ACPI spec requires OSPM 638 * to evaluate _OST method once every 10seconds to indicate that 639 * the shutdown is in progress 640 */ 641 acpi_get_handle(NULL, "\\_SB", &sb_handle); 642 while (1) { 643 pr_info("Graceful shutdown in progress.\n"); 644 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 645 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 646 msleep(ACPI_SB_INDICATE_INTERVAL); 647 } 648 } 649 650 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 651 { 652 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 653 654 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 655 if (!work_busy(&acpi_sb_work)) 656 schedule_work(&acpi_sb_work); 657 } else { 658 pr_warn("event %x is not supported by \\_SB device\n", event); 659 } 660 } 661 662 static int __init acpi_setup_sb_notify_handler(void) 663 { 664 acpi_handle sb_handle; 665 666 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 667 return -ENXIO; 668 669 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 670 acpi_sb_notify, NULL))) 671 return -EINVAL; 672 673 return 0; 674 } 675 676 /* -------------------------------------------------------------------------- 677 Device Matching 678 -------------------------------------------------------------------------- */ 679 680 /** 681 * acpi_get_first_physical_node - Get first physical node of an ACPI device 682 * @adev: ACPI device in question 683 * 684 * Return: First physical node of ACPI device @adev 685 */ 686 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 687 { 688 struct mutex *physical_node_lock = &adev->physical_node_lock; 689 struct device *phys_dev; 690 691 mutex_lock(physical_node_lock); 692 if (list_empty(&adev->physical_node_list)) { 693 phys_dev = NULL; 694 } else { 695 const struct acpi_device_physical_node *node; 696 697 node = list_first_entry(&adev->physical_node_list, 698 struct acpi_device_physical_node, node); 699 700 phys_dev = node->dev; 701 } 702 mutex_unlock(physical_node_lock); 703 return phys_dev; 704 } 705 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 706 707 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 708 const struct device *dev) 709 { 710 const struct device *phys_dev = acpi_get_first_physical_node(adev); 711 712 return phys_dev && phys_dev == dev ? adev : NULL; 713 } 714 715 /** 716 * acpi_device_is_first_physical_node - Is given dev first physical node 717 * @adev: ACPI companion device 718 * @dev: Physical device to check 719 * 720 * Function checks if given @dev is the first physical devices attached to 721 * the ACPI companion device. This distinction is needed in some cases 722 * where the same companion device is shared between many physical devices. 723 * 724 * Note that the caller have to provide valid @adev pointer. 725 */ 726 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 727 const struct device *dev) 728 { 729 return !!acpi_primary_dev_companion(adev, dev); 730 } 731 732 /* 733 * acpi_companion_match() - Can we match via ACPI companion device 734 * @dev: Device in question 735 * 736 * Check if the given device has an ACPI companion and if that companion has 737 * a valid list of PNP IDs, and if the device is the first (primary) physical 738 * device associated with it. Return the companion pointer if that's the case 739 * or NULL otherwise. 740 * 741 * If multiple physical devices are attached to a single ACPI companion, we need 742 * to be careful. The usage scenario for this kind of relationship is that all 743 * of the physical devices in question use resources provided by the ACPI 744 * companion. A typical case is an MFD device where all the sub-devices share 745 * the parent's ACPI companion. In such cases we can only allow the primary 746 * (first) physical device to be matched with the help of the companion's PNP 747 * IDs. 748 * 749 * Additional physical devices sharing the ACPI companion can still use 750 * resources available from it but they will be matched normally using functions 751 * provided by their bus types (and analogously for their modalias). 752 */ 753 const struct acpi_device *acpi_companion_match(const struct device *dev) 754 { 755 struct acpi_device *adev; 756 757 adev = ACPI_COMPANION(dev); 758 if (!adev) 759 return NULL; 760 761 if (list_empty(&adev->pnp.ids)) 762 return NULL; 763 764 return acpi_primary_dev_companion(adev, dev); 765 } 766 767 /** 768 * acpi_of_match_device - Match device object using the "compatible" property. 769 * @adev: ACPI device object to match. 770 * @of_match_table: List of device IDs to match against. 771 * @of_id: OF ID if matched 772 * 773 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 774 * identifiers and a _DSD object with the "compatible" property, use that 775 * property to match against the given list of identifiers. 776 */ 777 static bool acpi_of_match_device(const struct acpi_device *adev, 778 const struct of_device_id *of_match_table, 779 const struct of_device_id **of_id) 780 { 781 const union acpi_object *of_compatible, *obj; 782 int i, nval; 783 784 if (!adev) 785 return false; 786 787 of_compatible = adev->data.of_compatible; 788 if (!of_match_table || !of_compatible) 789 return false; 790 791 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 792 nval = of_compatible->package.count; 793 obj = of_compatible->package.elements; 794 } else { /* Must be ACPI_TYPE_STRING. */ 795 nval = 1; 796 obj = of_compatible; 797 } 798 /* Now we can look for the driver DT compatible strings */ 799 for (i = 0; i < nval; i++, obj++) { 800 const struct of_device_id *id; 801 802 for (id = of_match_table; id->compatible[0]; id++) 803 if (!strcasecmp(obj->string.pointer, id->compatible)) { 804 if (of_id) 805 *of_id = id; 806 return true; 807 } 808 } 809 810 return false; 811 } 812 813 static bool acpi_of_modalias(struct acpi_device *adev, 814 char *modalias, size_t len) 815 { 816 const union acpi_object *of_compatible; 817 const union acpi_object *obj; 818 const char *str, *chr; 819 820 of_compatible = adev->data.of_compatible; 821 if (!of_compatible) 822 return false; 823 824 if (of_compatible->type == ACPI_TYPE_PACKAGE) 825 obj = of_compatible->package.elements; 826 else /* Must be ACPI_TYPE_STRING. */ 827 obj = of_compatible; 828 829 str = obj->string.pointer; 830 chr = strchr(str, ','); 831 strscpy(modalias, chr ? chr + 1 : str, len); 832 833 return true; 834 } 835 836 /** 837 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 838 * @adev: ACPI device object to match 839 * @default_id: ID string to use as default if no compatible string found 840 * @modalias: Pointer to buffer that modalias value will be copied into 841 * @len: Length of modalias buffer 842 * 843 * This is a counterpart of of_alias_from_compatible() for struct acpi_device 844 * objects. If there is a compatible string for @adev, it will be copied to 845 * @modalias with the vendor prefix stripped; otherwise, @default_id will be 846 * used. 847 */ 848 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 849 char *modalias, size_t len) 850 { 851 if (!acpi_of_modalias(adev, modalias, len)) 852 strscpy(modalias, default_id, len); 853 } 854 EXPORT_SYMBOL_GPL(acpi_set_modalias); 855 856 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 857 struct acpi_hardware_id *hwid) 858 { 859 int i, msk, byte_shift; 860 char buf[3]; 861 862 if (!id->cls) 863 return false; 864 865 /* Apply class-code bitmask, before checking each class-code byte */ 866 for (i = 1; i <= 3; i++) { 867 byte_shift = 8 * (3 - i); 868 msk = (id->cls_msk >> byte_shift) & 0xFF; 869 if (!msk) 870 continue; 871 872 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 873 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 874 return false; 875 } 876 return true; 877 } 878 879 static bool __acpi_match_device(const struct acpi_device *device, 880 const struct acpi_device_id *acpi_ids, 881 const struct of_device_id *of_ids, 882 const struct acpi_device_id **acpi_id, 883 const struct of_device_id **of_id) 884 { 885 const struct acpi_device_id *id; 886 struct acpi_hardware_id *hwid; 887 888 /* 889 * If the device is not present, it is unnecessary to load device 890 * driver for it. 891 */ 892 if (!device || !device->status.present) 893 return false; 894 895 list_for_each_entry(hwid, &device->pnp.ids, list) { 896 /* First, check the ACPI/PNP IDs provided by the caller. */ 897 if (acpi_ids) { 898 for (id = acpi_ids; id->id[0] || id->cls; id++) { 899 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 900 goto out_acpi_match; 901 if (id->cls && __acpi_match_device_cls(id, hwid)) 902 goto out_acpi_match; 903 } 904 } 905 906 /* 907 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 908 * "compatible" property if found. 909 */ 910 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 911 return acpi_of_match_device(device, of_ids, of_id); 912 } 913 return false; 914 915 out_acpi_match: 916 if (acpi_id) 917 *acpi_id = id; 918 return true; 919 } 920 921 /** 922 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs 923 * @ids: Array of struct acpi_device_id objects to match against. 924 * @adev: The ACPI device pointer to match. 925 * 926 * Match the ACPI device @adev against a given list of ACPI IDs @ids. 927 * 928 * Return: 929 * a pointer to the first matching ACPI ID on success or %NULL on failure. 930 */ 931 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, 932 const struct acpi_device *adev) 933 { 934 const struct acpi_device_id *id = NULL; 935 936 __acpi_match_device(adev, ids, NULL, &id, NULL); 937 return id; 938 } 939 EXPORT_SYMBOL_GPL(acpi_match_acpi_device); 940 941 /** 942 * acpi_match_device - Match a struct device against a given list of ACPI IDs 943 * @ids: Array of struct acpi_device_id object to match against. 944 * @dev: The device structure to match. 945 * 946 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 947 * object for that handle and use that object to match against a given list of 948 * device IDs. 949 * 950 * Return a pointer to the first matching ID on success or %NULL on failure. 951 */ 952 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 953 const struct device *dev) 954 { 955 return acpi_match_acpi_device(ids, acpi_companion_match(dev)); 956 } 957 EXPORT_SYMBOL_GPL(acpi_match_device); 958 959 static const void *acpi_of_device_get_match_data(const struct device *dev) 960 { 961 struct acpi_device *adev = ACPI_COMPANION(dev); 962 const struct of_device_id *match = NULL; 963 964 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match)) 965 return NULL; 966 967 return match->data; 968 } 969 970 const void *acpi_device_get_match_data(const struct device *dev) 971 { 972 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; 973 const struct acpi_device_id *match; 974 975 if (!acpi_ids) 976 return acpi_of_device_get_match_data(dev); 977 978 match = acpi_match_device(acpi_ids, dev); 979 if (!match) 980 return NULL; 981 982 return (const void *)match->driver_data; 983 } 984 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 985 986 int acpi_match_device_ids(struct acpi_device *device, 987 const struct acpi_device_id *ids) 988 { 989 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 990 } 991 EXPORT_SYMBOL(acpi_match_device_ids); 992 993 bool acpi_driver_match_device(struct device *dev, 994 const struct device_driver *drv) 995 { 996 const struct acpi_device_id *acpi_ids = drv->acpi_match_table; 997 const struct of_device_id *of_ids = drv->of_match_table; 998 999 if (!acpi_ids) 1000 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL); 1001 1002 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); 1003 } 1004 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 1005 1006 /* -------------------------------------------------------------------------- 1007 ACPI Driver Management 1008 -------------------------------------------------------------------------- */ 1009 1010 /** 1011 * __acpi_bus_register_driver - register a driver with the ACPI bus 1012 * @driver: driver being registered 1013 * @owner: owning module/driver 1014 * 1015 * Registers a driver with the ACPI bus. Searches the namespace for all 1016 * devices that match the driver's criteria and binds. Returns zero for 1017 * success or a negative error status for failure. 1018 */ 1019 int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner) 1020 { 1021 if (acpi_disabled) 1022 return -ENODEV; 1023 driver->drv.name = driver->name; 1024 driver->drv.bus = &acpi_bus_type; 1025 driver->drv.owner = owner; 1026 1027 return driver_register(&driver->drv); 1028 } 1029 1030 EXPORT_SYMBOL(__acpi_bus_register_driver); 1031 1032 /** 1033 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 1034 * @driver: driver to unregister 1035 * 1036 * Unregisters a driver with the ACPI bus. Searches the namespace for all 1037 * devices that match the driver's criteria and unbinds. 1038 */ 1039 void acpi_bus_unregister_driver(struct acpi_driver *driver) 1040 { 1041 driver_unregister(&driver->drv); 1042 } 1043 1044 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1045 1046 /* -------------------------------------------------------------------------- 1047 ACPI Bus operations 1048 -------------------------------------------------------------------------- */ 1049 1050 static int acpi_bus_match(struct device *dev, const struct device_driver *drv) 1051 { 1052 struct acpi_device *acpi_dev = to_acpi_device(dev); 1053 const struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1054 1055 return acpi_dev->flags.match_driver 1056 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1057 } 1058 1059 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) 1060 { 1061 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1062 } 1063 1064 static int acpi_device_probe(struct device *dev) 1065 { 1066 struct acpi_device *acpi_dev = to_acpi_device(dev); 1067 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1068 int ret; 1069 1070 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1071 return -EINVAL; 1072 1073 if (!acpi_drv->ops.add) 1074 return -ENOSYS; 1075 1076 ret = acpi_drv->ops.add(acpi_dev); 1077 if (ret) { 1078 acpi_dev->driver_data = NULL; 1079 return ret; 1080 } 1081 1082 pr_debug("Driver [%s] successfully bound to device [%s]\n", 1083 acpi_drv->name, acpi_dev->pnp.bus_id); 1084 1085 if (acpi_drv->ops.notify) { 1086 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv); 1087 if (ret) { 1088 if (acpi_drv->ops.remove) 1089 acpi_drv->ops.remove(acpi_dev); 1090 1091 acpi_dev->driver_data = NULL; 1092 return ret; 1093 } 1094 } 1095 1096 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, 1097 acpi_dev->pnp.bus_id); 1098 1099 get_device(dev); 1100 return 0; 1101 } 1102 1103 static void acpi_device_remove(struct device *dev) 1104 { 1105 struct acpi_device *acpi_dev = to_acpi_device(dev); 1106 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1107 1108 if (acpi_drv->ops.notify) 1109 acpi_device_remove_notify_handler(acpi_dev, acpi_drv); 1110 1111 if (acpi_drv->ops.remove) 1112 acpi_drv->ops.remove(acpi_dev); 1113 1114 acpi_dev->driver_data = NULL; 1115 1116 put_device(dev); 1117 } 1118 1119 const struct bus_type acpi_bus_type = { 1120 .name = "acpi", 1121 .match = acpi_bus_match, 1122 .probe = acpi_device_probe, 1123 .remove = acpi_device_remove, 1124 .uevent = acpi_device_uevent, 1125 }; 1126 1127 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1128 { 1129 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1130 } 1131 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1132 1133 struct acpi_dev_walk_context { 1134 int (*fn)(struct acpi_device *, void *); 1135 void *data; 1136 }; 1137 1138 static int acpi_dev_for_one_check(struct device *dev, void *context) 1139 { 1140 struct acpi_dev_walk_context *adwc = context; 1141 1142 if (dev->bus != &acpi_bus_type) 1143 return 0; 1144 1145 return adwc->fn(to_acpi_device(dev), adwc->data); 1146 } 1147 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); 1148 1149 int acpi_dev_for_each_child(struct acpi_device *adev, 1150 int (*fn)(struct acpi_device *, void *), void *data) 1151 { 1152 struct acpi_dev_walk_context adwc = { 1153 .fn = fn, 1154 .data = data, 1155 }; 1156 1157 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1158 } 1159 1160 int acpi_dev_for_each_child_reverse(struct acpi_device *adev, 1161 int (*fn)(struct acpi_device *, void *), 1162 void *data) 1163 { 1164 struct acpi_dev_walk_context adwc = { 1165 .fn = fn, 1166 .data = data, 1167 }; 1168 1169 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); 1170 } 1171 1172 /* -------------------------------------------------------------------------- 1173 Initialization/Cleanup 1174 -------------------------------------------------------------------------- */ 1175 1176 static int __init acpi_bus_init_irq(void) 1177 { 1178 acpi_status status; 1179 char *message = NULL; 1180 1181 1182 /* 1183 * Let the system know what interrupt model we are using by 1184 * evaluating the \_PIC object, if exists. 1185 */ 1186 1187 switch (acpi_irq_model) { 1188 case ACPI_IRQ_MODEL_PIC: 1189 message = "PIC"; 1190 break; 1191 case ACPI_IRQ_MODEL_IOAPIC: 1192 message = "IOAPIC"; 1193 break; 1194 case ACPI_IRQ_MODEL_IOSAPIC: 1195 message = "IOSAPIC"; 1196 break; 1197 case ACPI_IRQ_MODEL_GIC: 1198 message = "GIC"; 1199 break; 1200 case ACPI_IRQ_MODEL_PLATFORM: 1201 message = "platform specific model"; 1202 break; 1203 case ACPI_IRQ_MODEL_LPIC: 1204 message = "LPIC"; 1205 break; 1206 case ACPI_IRQ_MODEL_RINTC: 1207 message = "RINTC"; 1208 break; 1209 default: 1210 pr_info("Unknown interrupt routing model\n"); 1211 return -ENODEV; 1212 } 1213 1214 pr_info("Using %s for interrupt routing\n", message); 1215 1216 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1217 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1218 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1219 return -ENODEV; 1220 } 1221 1222 return 0; 1223 } 1224 1225 /** 1226 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1227 * 1228 * The ACPI tables are accessible after this, but the handling of events has not 1229 * been initialized and the global lock is not available yet, so AML should not 1230 * be executed at this point. 1231 * 1232 * Doing this before switching the EFI runtime services to virtual mode allows 1233 * the EfiBootServices memory to be freed slightly earlier on boot. 1234 */ 1235 void __init acpi_early_init(void) 1236 { 1237 acpi_status status; 1238 1239 if (acpi_disabled) 1240 return; 1241 1242 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1243 1244 /* enable workarounds, unless strict ACPI spec. compliance */ 1245 if (!acpi_strict) 1246 acpi_gbl_enable_interpreter_slack = TRUE; 1247 1248 acpi_permanent_mmap = true; 1249 1250 #ifdef CONFIG_X86 1251 /* 1252 * If the machine falls into the DMI check table, 1253 * DSDT will be copied to memory. 1254 * Note that calling dmi_check_system() here on other architectures 1255 * would not be OK because only x86 initializes dmi early enough. 1256 * Thankfully only x86 systems need such quirks for now. 1257 */ 1258 dmi_check_system(dsdt_dmi_table); 1259 #endif 1260 1261 status = acpi_reallocate_root_table(); 1262 if (ACPI_FAILURE(status)) { 1263 pr_err("Unable to reallocate ACPI tables\n"); 1264 goto error0; 1265 } 1266 1267 status = acpi_initialize_subsystem(); 1268 if (ACPI_FAILURE(status)) { 1269 pr_err("Unable to initialize the ACPI Interpreter\n"); 1270 goto error0; 1271 } 1272 1273 #ifdef CONFIG_X86 1274 if (!acpi_ioapic) { 1275 /* compatible (0) means level (3) */ 1276 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1277 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1278 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1279 } 1280 /* Set PIC-mode SCI trigger type */ 1281 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1282 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1283 } else { 1284 /* 1285 * now that acpi_gbl_FADT is initialized, 1286 * update it with result from INT_SRC_OVR parsing 1287 */ 1288 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1289 } 1290 #endif 1291 return; 1292 1293 error0: 1294 disable_acpi(); 1295 } 1296 1297 /** 1298 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1299 * 1300 * Switch over the platform to the ACPI mode (if possible). 1301 * 1302 * Doing this too early is generally unsafe, but at the same time it needs to be 1303 * done before all things that really depend on ACPI. The right spot appears to 1304 * be before finalizing the EFI initialization. 1305 */ 1306 void __init acpi_subsystem_init(void) 1307 { 1308 acpi_status status; 1309 1310 if (acpi_disabled) 1311 return; 1312 1313 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1314 if (ACPI_FAILURE(status)) { 1315 pr_err("Unable to enable ACPI\n"); 1316 disable_acpi(); 1317 } else { 1318 /* 1319 * If the system is using ACPI then we can be reasonably 1320 * confident that any regulators are managed by the firmware 1321 * so tell the regulator core it has everything it needs to 1322 * know. 1323 */ 1324 regulator_has_full_constraints(); 1325 } 1326 } 1327 1328 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1329 { 1330 if (event == ACPI_TABLE_EVENT_LOAD) 1331 acpi_scan_table_notify(); 1332 1333 return acpi_sysfs_table_handler(event, table, context); 1334 } 1335 1336 static int __init acpi_bus_init(void) 1337 { 1338 int result; 1339 acpi_status status; 1340 1341 acpi_os_initialize1(); 1342 1343 status = acpi_load_tables(); 1344 if (ACPI_FAILURE(status)) { 1345 pr_err("Unable to load the System Description Tables\n"); 1346 goto error1; 1347 } 1348 1349 /* 1350 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1351 * device is found in the namespace. 1352 * 1353 * This is accomplished by looking for the ECDT table and getting the EC 1354 * parameters out of that. 1355 * 1356 * Do that before calling acpi_initialize_objects() which may trigger EC 1357 * address space accesses. 1358 */ 1359 acpi_ec_ecdt_probe(); 1360 1361 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1362 if (ACPI_FAILURE(status)) { 1363 pr_err("Unable to start the ACPI Interpreter\n"); 1364 goto error1; 1365 } 1366 1367 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1368 if (ACPI_FAILURE(status)) { 1369 pr_err("Unable to initialize ACPI objects\n"); 1370 goto error1; 1371 } 1372 1373 /* 1374 * _OSC method may exist in module level code, 1375 * so it must be run after ACPI_FULL_INITIALIZATION 1376 */ 1377 acpi_bus_osc_negotiate_platform_control(); 1378 acpi_bus_osc_negotiate_usb_control(); 1379 1380 /* 1381 * _PDC control method may load dynamic SSDT tables, 1382 * and we need to install the table handler before that. 1383 */ 1384 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1385 1386 acpi_sysfs_init(); 1387 1388 acpi_early_processor_control_setup(); 1389 1390 /* 1391 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1392 * is necessary to enable it as early as possible. 1393 */ 1394 acpi_ec_dsdt_probe(); 1395 1396 pr_info("Interpreter enabled\n"); 1397 1398 /* Initialize sleep structures */ 1399 acpi_sleep_init(); 1400 1401 /* 1402 * Get the system interrupt model and evaluate \_PIC. 1403 */ 1404 result = acpi_bus_init_irq(); 1405 if (result) 1406 goto error1; 1407 1408 /* 1409 * Register the for all standard device notifications. 1410 */ 1411 status = 1412 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1413 &acpi_bus_notify, NULL); 1414 if (ACPI_FAILURE(status)) { 1415 pr_err("Unable to register for system notifications\n"); 1416 goto error1; 1417 } 1418 1419 /* 1420 * Create the top ACPI proc directory 1421 */ 1422 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1423 1424 result = bus_register(&acpi_bus_type); 1425 if (!result) 1426 return 0; 1427 1428 /* Mimic structured exception handling */ 1429 error1: 1430 acpi_terminate(); 1431 return -ENODEV; 1432 } 1433 1434 struct kobject *acpi_kobj; 1435 EXPORT_SYMBOL_GPL(acpi_kobj); 1436 1437 static int __init acpi_init(void) 1438 { 1439 int result; 1440 1441 if (acpi_disabled) { 1442 pr_info("Interpreter disabled.\n"); 1443 return -ENODEV; 1444 } 1445 1446 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1447 if (!acpi_kobj) 1448 pr_debug("%s: kset create error\n", __func__); 1449 1450 init_prmt(); 1451 acpi_init_pcc(); 1452 result = acpi_bus_init(); 1453 if (result) { 1454 kobject_put(acpi_kobj); 1455 disable_acpi(); 1456 return result; 1457 } 1458 acpi_init_ffh(); 1459 1460 pci_mmcfg_late_init(); 1461 acpi_viot_early_init(); 1462 acpi_hest_init(); 1463 acpi_ghes_init(); 1464 acpi_arm_init(); 1465 acpi_riscv_init(); 1466 acpi_scan_init(); 1467 acpi_ec_init(); 1468 acpi_debugfs_init(); 1469 acpi_sleep_proc_init(); 1470 acpi_wakeup_device_init(); 1471 acpi_debugger_init(); 1472 acpi_setup_sb_notify_handler(); 1473 acpi_viot_init(); 1474 return 0; 1475 } 1476 1477 subsys_initcall(acpi_init); 1478