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_dump_osc_data(acpi_handle handle, const guid_t *guid, int rev, 184 struct acpi_buffer *cap) 185 { 186 u32 *capbuf = cap->pointer; 187 int i; 188 189 acpi_handle_debug(handle, "_OSC: UUID: %pUL, rev: %d\n", guid, rev); 190 for (i = 0; i < cap->length / sizeof(u32); i++) 191 acpi_handle_debug(handle, "_OSC: capabilities DWORD %i: [%08x]\n", 192 i, capbuf[i]); 193 } 194 195 #define OSC_ERROR_MASK (OSC_REQUEST_ERROR | OSC_INVALID_UUID_ERROR | \ 196 OSC_INVALID_REVISION_ERROR | \ 197 OSC_CAPABILITIES_MASK_ERROR) 198 199 static int acpi_eval_osc(acpi_handle handle, guid_t *guid, int rev, 200 struct acpi_buffer *cap, 201 union acpi_object in_params[at_least 4], 202 struct acpi_buffer *output) 203 { 204 struct acpi_object_list input; 205 union acpi_object *out_obj; 206 acpi_status status; 207 208 in_params[0].type = ACPI_TYPE_BUFFER; 209 in_params[0].buffer.length = sizeof(*guid); 210 in_params[0].buffer.pointer = (u8 *)guid; 211 in_params[1].type = ACPI_TYPE_INTEGER; 212 in_params[1].integer.value = rev; 213 in_params[2].type = ACPI_TYPE_INTEGER; 214 in_params[2].integer.value = cap->length / sizeof(u32); 215 in_params[3].type = ACPI_TYPE_BUFFER; 216 in_params[3].buffer.length = cap->length; 217 in_params[3].buffer.pointer = cap->pointer; 218 input.pointer = in_params; 219 input.count = 4; 220 221 output->length = ACPI_ALLOCATE_BUFFER; 222 output->pointer = NULL; 223 224 status = acpi_evaluate_object(handle, "_OSC", &input, output); 225 if (ACPI_FAILURE(status) || !output->length) 226 return -ENODATA; 227 228 out_obj = output->pointer; 229 if (out_obj->type != ACPI_TYPE_BUFFER || 230 out_obj->buffer.length != cap->length) { 231 acpi_handle_debug(handle, "Invalid _OSC return buffer\n"); 232 acpi_dump_osc_data(handle, guid, rev, cap); 233 ACPI_FREE(out_obj); 234 return -ENODATA; 235 } 236 237 return 0; 238 } 239 240 static bool acpi_osc_error_check(acpi_handle handle, guid_t *guid, int rev, 241 struct acpi_buffer *cap, u32 *retbuf) 242 { 243 /* Only take defined error bits into account. */ 244 u32 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK; 245 u32 *capbuf = cap->pointer; 246 bool fail; 247 248 /* 249 * If OSC_QUERY_ENABLE is set, ignore the "capabilities masked" 250 * bit because it merely means that some features have not been 251 * acknowledged which is not unexpected. 252 */ 253 if (capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE) 254 errors &= ~OSC_CAPABILITIES_MASK_ERROR; 255 256 if (!errors) 257 return false; 258 259 acpi_dump_osc_data(handle, guid, rev, cap); 260 /* 261 * As a rule, fail only if OSC_QUERY_ENABLE is set because otherwise the 262 * acknowledged features need to be controlled. 263 */ 264 fail = !!(capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE); 265 266 if (errors & OSC_REQUEST_ERROR) 267 acpi_handle_debug(handle, "_OSC: request failed\n"); 268 269 if (errors & OSC_INVALID_UUID_ERROR) { 270 acpi_handle_debug(handle, "_OSC: invalid UUID\n"); 271 /* 272 * Always fail if this bit is set because it means that the 273 * request could not be processed. 274 */ 275 fail = true; 276 } 277 278 if (errors & OSC_INVALID_REVISION_ERROR) 279 acpi_handle_debug(handle, "_OSC: invalid revision\n"); 280 281 if (errors & OSC_CAPABILITIES_MASK_ERROR) 282 acpi_handle_debug(handle, "_OSC: capability bits masked\n"); 283 284 return fail; 285 } 286 287 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 288 { 289 union acpi_object in_params[4], *out_obj; 290 struct acpi_buffer output; 291 acpi_status status = AE_OK; 292 guid_t guid; 293 u32 *retbuf; 294 int ret; 295 296 if (!context || !context->cap.pointer || 297 context->cap.length < 2 * sizeof(u32) || 298 guid_parse(context->uuid_str, &guid)) 299 return AE_BAD_PARAMETER; 300 301 ret = acpi_eval_osc(handle, &guid, context->rev, &context->cap, 302 in_params, &output); 303 if (ret) 304 return AE_ERROR; 305 306 out_obj = output.pointer; 307 retbuf = (u32 *)out_obj->buffer.pointer; 308 309 if (acpi_osc_error_check(handle, &guid, context->rev, &context->cap, retbuf)) { 310 status = AE_ERROR; 311 goto out; 312 } 313 314 context->ret.length = out_obj->buffer.length; 315 context->ret.pointer = kmemdup(retbuf, context->ret.length, GFP_KERNEL); 316 if (!context->ret.pointer) { 317 status = AE_NO_MEMORY; 318 goto out; 319 } 320 status = AE_OK; 321 322 out: 323 ACPI_FREE(out_obj); 324 return status; 325 } 326 EXPORT_SYMBOL(acpi_run_osc); 327 328 static int acpi_osc_handshake(acpi_handle handle, const char *uuid_str, 329 int rev, u32 *capbuf, size_t bufsize) 330 { 331 union acpi_object in_params[4], *out_obj; 332 struct acpi_object_list input; 333 struct acpi_buffer cap = { 334 .pointer = capbuf, 335 .length = bufsize * sizeof(u32), 336 }; 337 struct acpi_buffer output; 338 u32 *retbuf, test, errors; 339 guid_t guid; 340 int ret, i; 341 342 if (!capbuf || bufsize < 2 || guid_parse(uuid_str, &guid)) 343 return -EINVAL; 344 345 /* First evaluate _OSC with OSC_QUERY_ENABLE set. */ 346 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 347 348 ret = acpi_eval_osc(handle, &guid, rev, &cap, in_params, &output); 349 if (ret) 350 return ret; 351 352 out_obj = output.pointer; 353 retbuf = (u32 *)out_obj->buffer.pointer; 354 355 if (acpi_osc_error_check(handle, &guid, rev, &cap, retbuf)) { 356 ret = -ENODATA; 357 goto out; 358 } 359 360 /* 361 * Clear the feature bits in the capabilities buffer that have not been 362 * acknowledged and clear the return buffer. 363 */ 364 for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) { 365 capbuf[i] &= retbuf[i]; 366 test |= capbuf[i]; 367 retbuf[i] = 0; 368 } 369 /* 370 * If none of the feature bits have been acknowledged, there's nothing 371 * more to do. capbuf[] contains a feature mask of all zeros. 372 */ 373 if (!test) 374 goto out; 375 376 retbuf[OSC_QUERY_DWORD] = 0; 377 /* 378 * Now evaluate _OSC again (directly) with OSC_QUERY_ENABLE clear and 379 * the updated input and output buffers used before. Since the feature 380 * bits that were clear in the return buffer from the previous _OSC 381 * evaluation are also clear in the capabilities buffer now, this _OSC 382 * evaluation is not expected to fail. 383 */ 384 capbuf[OSC_QUERY_DWORD] = 0; 385 /* Reuse in_params[] populated by acpi_eval_osc(). */ 386 input.pointer = in_params; 387 input.count = 4; 388 389 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_OSC", &input, &output))) { 390 ret = -ENODATA; 391 goto out; 392 } 393 394 /* 395 * Clear the feature bits in capbuf[] that have not been acknowledged. 396 * After that, capbuf[] contains the resultant feature mask. 397 */ 398 for (i = OSC_QUERY_DWORD + 1, test = 0; i < bufsize; i++) { 399 test |= capbuf[i] & ~retbuf[i]; 400 capbuf[i] &= retbuf[i]; 401 } 402 403 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK; 404 /* 405 * Some platforms set OSC_CAPABILITIES_MASK_ERROR even though they 406 * acknowledge all of the requested features, so avoid complaining in 407 * those cases unless any other error bits are also set. 408 */ 409 if (errors && (test || errors != OSC_CAPABILITIES_MASK_ERROR)) { 410 /* 411 * Complain about the unexpected errors and print diagnostic 412 * information related to them. 413 */ 414 acpi_handle_err(handle, "_OSC: errors while processing control request\n"); 415 acpi_handle_err(handle, "_OSC: some features may be missing\n"); 416 acpi_osc_error_check(handle, &guid, rev, &cap, retbuf); 417 } 418 419 out: 420 ACPI_FREE(out_obj); 421 return ret; 422 } 423 424 bool osc_sb_apei_support_acked; 425 426 /* 427 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 428 * OSPM supports platform coordinated low power idle(LPI) states 429 */ 430 bool osc_pc_lpi_support_confirmed; 431 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 432 433 /* 434 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': 435 * Starting with ACPI Specification 6.2, all _CPC registers can be in 436 * PCC, System Memory, System IO, or Functional Fixed Hardware address 437 * spaces. OSPM support for this more flexible register space scheme is 438 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. 439 * 440 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: 441 * - PCC or Functional Fixed Hardware address space if defined 442 * - SystemMemory address space (NULL register) if not defined 443 */ 444 bool osc_cpc_flexible_adr_space_confirmed; 445 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); 446 447 /* 448 * ACPI 6.4 Operating System Capabilities for USB. 449 */ 450 bool osc_sb_native_usb4_support_confirmed; 451 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); 452 453 bool osc_sb_cppc2_support_acked; 454 455 static void acpi_bus_osc_negotiate_platform_control(void) 456 { 457 static const u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 458 u32 capbuf[2], feature_mask; 459 acpi_handle handle; 460 461 feature_mask = OSC_SB_PR3_SUPPORT | OSC_SB_HOTPLUG_OST_SUPPORT | 462 OSC_SB_PCLPI_SUPPORT | OSC_SB_OVER_16_PSTATES_SUPPORT | 463 OSC_SB_GED_SUPPORT | OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT; 464 465 if (IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_X86)) 466 feature_mask |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 467 468 if (IS_ENABLED(CONFIG_ACPI_CPPC_LIB)) { 469 feature_mask |= OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT | 470 OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 471 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 472 feature_mask |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 473 } 474 475 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 476 feature_mask |= OSC_SB_PAD_SUPPORT; 477 478 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 479 feature_mask |= OSC_SB_PPC_OST_SUPPORT; 480 481 if (IS_ENABLED(CONFIG_ACPI_THERMAL)) 482 feature_mask |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT; 483 484 if (IS_ENABLED(CONFIG_ACPI_BATTERY)) 485 feature_mask |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT; 486 487 if (IS_ENABLED(CONFIG_ACPI_PRMT)) 488 feature_mask |= OSC_SB_PRM_SUPPORT; 489 490 if (IS_ENABLED(CONFIG_ACPI_FFH)) 491 feature_mask |= OSC_SB_FFH_OPR_SUPPORT; 492 493 if (IS_ENABLED(CONFIG_USB4)) 494 feature_mask |= OSC_SB_NATIVE_USB4_SUPPORT; 495 496 if (!ghes_disable) 497 feature_mask |= OSC_SB_APEI_SUPPORT; 498 499 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 500 return; 501 502 capbuf[OSC_SUPPORT_DWORD] = feature_mask; 503 504 acpi_handle_info(handle, "platform _OSC: OS support mask [%08x]\n", feature_mask); 505 506 if (acpi_osc_handshake(handle, sb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf))) 507 return; 508 509 feature_mask = capbuf[OSC_SUPPORT_DWORD]; 510 511 acpi_handle_info(handle, "platform _OSC: OS control mask [%08x]\n", feature_mask); 512 513 osc_sb_cppc2_support_acked = feature_mask & OSC_SB_CPCV2_SUPPORT; 514 osc_sb_apei_support_acked = feature_mask & OSC_SB_APEI_SUPPORT; 515 osc_pc_lpi_support_confirmed = feature_mask & OSC_SB_PCLPI_SUPPORT; 516 osc_sb_native_usb4_support_confirmed = feature_mask & OSC_SB_NATIVE_USB4_SUPPORT; 517 osc_cpc_flexible_adr_space_confirmed = feature_mask & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 518 } 519 520 /* 521 * Native control of USB4 capabilities. If any of the tunneling bits is 522 * set it means OS is in control and we use software based connection 523 * manager. 524 */ 525 u32 osc_sb_native_usb4_control; 526 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); 527 528 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) 529 { 530 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, 531 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', 532 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', 533 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', 534 (bits & OSC_USB_XDOMAIN) ? '+' : '-'); 535 } 536 537 static void acpi_bus_osc_negotiate_usb_control(void) 538 { 539 static const u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; 540 u32 capbuf[3], control; 541 acpi_handle handle; 542 543 if (!osc_sb_native_usb4_support_confirmed) 544 return; 545 546 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 547 return; 548 549 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | 550 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; 551 552 capbuf[OSC_SUPPORT_DWORD] = 0; 553 capbuf[OSC_CONTROL_DWORD] = control; 554 555 if (acpi_osc_handshake(handle, sb_usb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf))) 556 return; 557 558 osc_sb_native_usb4_control = capbuf[OSC_CONTROL_DWORD]; 559 560 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 561 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", osc_sb_native_usb4_control); 562 } 563 564 /* -------------------------------------------------------------------------- 565 Notification Handling 566 -------------------------------------------------------------------------- */ 567 568 /** 569 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler 570 * @handle: Target ACPI object. 571 * @type: Notification type. 572 * @data: Ignored. 573 * 574 * This only handles notifications related to device hotplug. 575 */ 576 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 577 { 578 struct acpi_device *adev; 579 580 switch (type) { 581 case ACPI_NOTIFY_BUS_CHECK: 582 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 583 break; 584 585 case ACPI_NOTIFY_DEVICE_CHECK: 586 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 587 break; 588 589 case ACPI_NOTIFY_DEVICE_WAKE: 590 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 591 return; 592 593 case ACPI_NOTIFY_EJECT_REQUEST: 594 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 595 break; 596 597 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 598 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 599 /* TBD: Exactly what does 'light' mean? */ 600 return; 601 602 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 603 acpi_handle_err(handle, "Device cannot be configured due " 604 "to a frequency mismatch\n"); 605 return; 606 607 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 608 acpi_handle_err(handle, "Device cannot be configured due " 609 "to a bus mode mismatch\n"); 610 return; 611 612 case ACPI_NOTIFY_POWER_FAULT: 613 acpi_handle_err(handle, "Device has suffered a power fault\n"); 614 return; 615 616 default: 617 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 618 return; 619 } 620 621 adev = acpi_get_acpi_dev(handle); 622 623 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 624 return; 625 626 acpi_put_acpi_dev(adev); 627 628 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); 629 } 630 631 int acpi_dev_install_notify_handler(struct acpi_device *adev, 632 u32 handler_type, 633 acpi_notify_handler handler, void *context) 634 { 635 acpi_status status; 636 637 status = acpi_install_notify_handler(adev->handle, handler_type, 638 handler, context); 639 if (ACPI_FAILURE(status)) 640 return -ENODEV; 641 642 return 0; 643 } 644 EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); 645 646 void acpi_dev_remove_notify_handler(struct acpi_device *adev, 647 u32 handler_type, 648 acpi_notify_handler handler) 649 { 650 acpi_remove_notify_handler(adev->handle, handler_type, handler); 651 acpi_os_wait_events_complete(); 652 } 653 EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); 654 655 struct acpi_notify_handler_devres { 656 struct acpi_device *adev; 657 acpi_notify_handler handler; 658 u32 handler_type; 659 }; 660 661 static void devm_acpi_notify_handler_release(struct device *dev, void *res) 662 { 663 struct acpi_notify_handler_devres *dr = res; 664 665 acpi_dev_remove_notify_handler(dr->adev, dr->handler_type, dr->handler); 666 } 667 668 /** 669 * devm_acpi_install_notify_handler - Install an ACPI notify handler for a 670 * managed device 671 * @dev: Device to install a notify handler for 672 * @handler_type: Type of the notify handler 673 * @handler: Handler function to install 674 * @context: Data passed back to the handler function 675 * 676 * This function performs the same function as acpi_dev_install_notify_handler() 677 * called for the ACPI companion of @dev with the same @handler_type, @handler, 678 * and @context arguments, but the ACPI notify handler installed by it will be 679 * automatically removed on driver detach. 680 * 681 * Callers should ensure that all resources used by @handler have been allocated 682 * prior to invoking this function, in which case those resources should be 683 * devres-managed so that they won't be released before the notify handler 684 * removal. Otherwise, special synchronization between @handler and the 685 * management of those resources is required. 686 * 687 * When the request fails, an error message is printed. Don't add extra error 688 * messages at the call sites. 689 * 690 * Return: 0 on success or a negative error number. 691 */ 692 int devm_acpi_install_notify_handler(struct device *dev, u32 handler_type, 693 acpi_notify_handler handler, void *context) 694 { 695 struct acpi_notify_handler_devres *dr; 696 struct acpi_device *adev; 697 int ret; 698 699 adev = ACPI_COMPANION(dev); 700 if (!adev) 701 return dev_err_probe(dev, -ENODEV, "No ACPI companion\n"); 702 703 dr = devres_alloc(devm_acpi_notify_handler_release, sizeof(*dr), GFP_KERNEL); 704 if (!dr) 705 return -ENOMEM; 706 707 ret = acpi_dev_install_notify_handler(adev, handler_type, handler, context); 708 if (ret) { 709 devres_free(dr); 710 return dev_err_probe(dev, ret, "Failed to install an ACPI notify handler\n"); 711 } 712 713 dr->adev = adev; 714 dr->handler = handler; 715 dr->handler_type = handler_type; 716 devres_add(dev, dr); 717 718 return 0; 719 } 720 EXPORT_SYMBOL_GPL(devm_acpi_install_notify_handler); 721 722 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 723 724 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 725 #define ACPI_SB_INDICATE_INTERVAL 10000 726 727 static void sb_notify_work(struct work_struct *dummy) 728 { 729 acpi_handle sb_handle; 730 731 orderly_poweroff(true); 732 733 /* 734 * After initiating graceful shutdown, the ACPI spec requires OSPM 735 * to evaluate _OST method once every 10seconds to indicate that 736 * the shutdown is in progress 737 */ 738 acpi_get_handle(NULL, "\\_SB", &sb_handle); 739 while (1) { 740 pr_info("Graceful shutdown in progress.\n"); 741 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 742 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 743 msleep(ACPI_SB_INDICATE_INTERVAL); 744 } 745 } 746 747 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 748 { 749 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 750 751 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 752 if (!work_busy(&acpi_sb_work)) 753 schedule_work(&acpi_sb_work); 754 } else { 755 pr_warn("event %x is not supported by \\_SB device\n", event); 756 } 757 } 758 759 static int __init acpi_setup_sb_notify_handler(void) 760 { 761 acpi_handle sb_handle; 762 763 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 764 return -ENXIO; 765 766 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 767 acpi_sb_notify, NULL))) 768 return -EINVAL; 769 770 return 0; 771 } 772 773 /* -------------------------------------------------------------------------- 774 Device Matching 775 -------------------------------------------------------------------------- */ 776 777 /** 778 * acpi_get_first_physical_node - Get first physical node of an ACPI device 779 * @adev: ACPI device in question 780 * 781 * Return: First physical node of ACPI device @adev 782 */ 783 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 784 { 785 struct mutex *physical_node_lock = &adev->physical_node_lock; 786 struct device *phys_dev; 787 788 mutex_lock(physical_node_lock); 789 if (list_empty(&adev->physical_node_list)) { 790 phys_dev = NULL; 791 } else { 792 const struct acpi_device_physical_node *node; 793 794 node = list_first_entry(&adev->physical_node_list, 795 struct acpi_device_physical_node, node); 796 797 phys_dev = node->dev; 798 } 799 mutex_unlock(physical_node_lock); 800 return phys_dev; 801 } 802 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 803 804 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 805 const struct device *dev) 806 { 807 const struct device *phys_dev = acpi_get_first_physical_node(adev); 808 809 return phys_dev && phys_dev == dev ? adev : NULL; 810 } 811 812 /** 813 * acpi_device_is_first_physical_node - Is given dev first physical node 814 * @adev: ACPI companion device 815 * @dev: Physical device to check 816 * 817 * Function checks if given @dev is the first physical devices attached to 818 * the ACPI companion device. This distinction is needed in some cases 819 * where the same companion device is shared between many physical devices. 820 * 821 * Note that the caller have to provide valid @adev pointer. 822 */ 823 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 824 const struct device *dev) 825 { 826 return !!acpi_primary_dev_companion(adev, dev); 827 } 828 829 /* 830 * acpi_companion_match() - Can we match via ACPI companion device 831 * @dev: Device in question 832 * 833 * Check if the given device has an ACPI companion and if that companion has 834 * a valid list of PNP IDs, and if the device is the first (primary) physical 835 * device associated with it. Return the companion pointer if that's the case 836 * or NULL otherwise. 837 * 838 * If multiple physical devices are attached to a single ACPI companion, we need 839 * to be careful. The usage scenario for this kind of relationship is that all 840 * of the physical devices in question use resources provided by the ACPI 841 * companion. A typical case is an MFD device where all the sub-devices share 842 * the parent's ACPI companion. In such cases we can only allow the primary 843 * (first) physical device to be matched with the help of the companion's PNP 844 * IDs. 845 * 846 * Additional physical devices sharing the ACPI companion can still use 847 * resources available from it but they will be matched normally using functions 848 * provided by their bus types (and analogously for their modalias). 849 */ 850 const struct acpi_device *acpi_companion_match(const struct device *dev) 851 { 852 struct acpi_device *adev; 853 854 adev = ACPI_COMPANION(dev); 855 if (!adev) 856 return NULL; 857 858 if (list_empty(&adev->pnp.ids)) 859 return NULL; 860 861 return acpi_primary_dev_companion(adev, dev); 862 } 863 864 /** 865 * acpi_of_match_device - Match device object using the "compatible" property. 866 * @adev: ACPI device object to match. 867 * @of_match_table: List of device IDs to match against. 868 * @of_id: OF ID if matched 869 * 870 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 871 * identifiers and a _DSD object with the "compatible" property, use that 872 * property to match against the given list of identifiers. 873 */ 874 bool acpi_of_match_device(const struct acpi_device *adev, 875 const struct of_device_id *of_match_table, 876 const struct of_device_id **of_id) 877 { 878 const union acpi_object *of_compatible, *obj; 879 int i, nval; 880 881 if (!adev) 882 return false; 883 884 of_compatible = adev->data.of_compatible; 885 if (!of_match_table || !of_compatible) 886 return false; 887 888 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 889 nval = of_compatible->package.count; 890 obj = of_compatible->package.elements; 891 } else { /* Must be ACPI_TYPE_STRING. */ 892 nval = 1; 893 obj = of_compatible; 894 } 895 /* Now we can look for the driver DT compatible strings */ 896 for (i = 0; i < nval; i++, obj++) { 897 const struct of_device_id *id; 898 899 for (id = of_match_table; id->compatible[0]; id++) 900 if (!strcasecmp(obj->string.pointer, id->compatible)) { 901 if (of_id) 902 *of_id = id; 903 return true; 904 } 905 } 906 907 return false; 908 } 909 910 static bool acpi_of_modalias(struct acpi_device *adev, 911 char *modalias, size_t len) 912 { 913 const union acpi_object *of_compatible; 914 const union acpi_object *obj; 915 const char *str, *chr; 916 917 of_compatible = adev->data.of_compatible; 918 if (!of_compatible) 919 return false; 920 921 if (of_compatible->type == ACPI_TYPE_PACKAGE) 922 obj = of_compatible->package.elements; 923 else /* Must be ACPI_TYPE_STRING. */ 924 obj = of_compatible; 925 926 str = obj->string.pointer; 927 chr = strchr(str, ','); 928 strscpy(modalias, chr ? chr + 1 : str, len); 929 930 return true; 931 } 932 933 /** 934 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 935 * @adev: ACPI device object to match 936 * @default_id: ID string to use as default if no compatible string found 937 * @modalias: Pointer to buffer that modalias value will be copied into 938 * @len: Length of modalias buffer 939 * 940 * This is a counterpart of of_alias_from_compatible() for struct acpi_device 941 * objects. If there is a compatible string for @adev, it will be copied to 942 * @modalias with the vendor prefix stripped; otherwise, @default_id will be 943 * used. 944 */ 945 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 946 char *modalias, size_t len) 947 { 948 if (!acpi_of_modalias(adev, modalias, len)) 949 strscpy(modalias, default_id, len); 950 } 951 EXPORT_SYMBOL_GPL(acpi_set_modalias); 952 953 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 954 struct acpi_hardware_id *hwid) 955 { 956 int i, msk, byte_shift; 957 char buf[3]; 958 959 if (!id->cls) 960 return false; 961 962 /* Apply class-code bitmask, before checking each class-code byte */ 963 for (i = 1; i <= 3; i++) { 964 byte_shift = 8 * (3 - i); 965 msk = (id->cls_msk >> byte_shift) & 0xFF; 966 if (!msk) 967 continue; 968 969 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 970 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 971 return false; 972 } 973 return true; 974 } 975 976 static bool __acpi_match_device(const struct acpi_device *device, 977 const struct acpi_device_id *acpi_ids, 978 const struct of_device_id *of_ids, 979 const struct acpi_device_id **acpi_id, 980 const struct of_device_id **of_id) 981 { 982 const struct acpi_device_id *id; 983 struct acpi_hardware_id *hwid; 984 985 /* 986 * If the device is not present, it is unnecessary to load device 987 * driver for it. 988 */ 989 if (!device || !device->status.present) 990 return false; 991 992 list_for_each_entry(hwid, &device->pnp.ids, list) { 993 /* First, check the ACPI/PNP IDs provided by the caller. */ 994 if (acpi_ids) { 995 for (id = acpi_ids; id->id[0] || id->cls; id++) { 996 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 997 goto out_acpi_match; 998 if (id->cls && __acpi_match_device_cls(id, hwid)) 999 goto out_acpi_match; 1000 } 1001 } 1002 1003 /* 1004 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 1005 * "compatible" property if found. 1006 */ 1007 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 1008 return acpi_of_match_device(device, of_ids, of_id); 1009 } 1010 return false; 1011 1012 out_acpi_match: 1013 if (acpi_id) 1014 *acpi_id = id; 1015 return true; 1016 } 1017 1018 /** 1019 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs 1020 * @ids: Array of struct acpi_device_id objects to match against. 1021 * @adev: The ACPI device pointer to match. 1022 * 1023 * Match the ACPI device @adev against a given list of ACPI IDs @ids. 1024 * 1025 * Return: 1026 * a pointer to the first matching ACPI ID on success or %NULL on failure. 1027 */ 1028 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, 1029 const struct acpi_device *adev) 1030 { 1031 const struct acpi_device_id *id = NULL; 1032 1033 __acpi_match_device(adev, ids, NULL, &id, NULL); 1034 return id; 1035 } 1036 EXPORT_SYMBOL_GPL(acpi_match_acpi_device); 1037 1038 /** 1039 * acpi_match_device - Match a struct device against a given list of ACPI IDs 1040 * @ids: Array of struct acpi_device_id object to match against. 1041 * @dev: The device structure to match. 1042 * 1043 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 1044 * object for that handle and use that object to match against a given list of 1045 * device IDs. 1046 * 1047 * Return a pointer to the first matching ID on success or %NULL on failure. 1048 */ 1049 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 1050 const struct device *dev) 1051 { 1052 return acpi_match_acpi_device(ids, acpi_companion_match(dev)); 1053 } 1054 EXPORT_SYMBOL_GPL(acpi_match_device); 1055 1056 const void *acpi_device_get_match_data(const struct device *dev) 1057 { 1058 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; 1059 const struct of_device_id *of_ids = dev->driver->of_match_table; 1060 const struct acpi_device *adev = acpi_companion_match(dev); 1061 const struct acpi_device_id *acpi_id = NULL; 1062 const struct of_device_id *of_id = NULL; 1063 1064 if (!__acpi_match_device(adev, acpi_ids, of_ids, &acpi_id, &of_id)) 1065 return NULL; 1066 1067 if (acpi_id) 1068 return (const void *)acpi_id->driver_data; 1069 1070 if (of_id) 1071 return of_id->data; 1072 1073 return NULL; 1074 } 1075 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 1076 1077 int acpi_match_device_ids(struct acpi_device *device, 1078 const struct acpi_device_id *ids) 1079 { 1080 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 1081 } 1082 EXPORT_SYMBOL(acpi_match_device_ids); 1083 1084 bool acpi_driver_match_device(struct device *dev, 1085 const struct device_driver *drv) 1086 { 1087 const struct acpi_device_id *acpi_ids = drv->acpi_match_table; 1088 const struct of_device_id *of_ids = drv->of_match_table; 1089 1090 if (!acpi_ids) 1091 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL); 1092 1093 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); 1094 } 1095 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 1096 1097 /* -------------------------------------------------------------------------- 1098 ACPI Bus operations 1099 -------------------------------------------------------------------------- */ 1100 1101 static int acpi_bus_match(struct device *dev, const struct device_driver *drv) 1102 { 1103 return 0; 1104 } 1105 1106 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) 1107 { 1108 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1109 } 1110 1111 const struct bus_type acpi_bus_type = { 1112 .name = "acpi", 1113 .match = acpi_bus_match, 1114 .uevent = acpi_device_uevent, 1115 }; 1116 1117 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1118 { 1119 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1120 } 1121 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1122 1123 /** 1124 * acpi_bus_find_device_by_name() - Locate an ACPI device by its name 1125 * @name: Name of the device to match 1126 * 1127 * The caller is responsible for calling put_device() on the returned object. 1128 * 1129 * Returns: 1130 * New reference to the matched device or NULL if the device can't be found. 1131 */ 1132 struct device *acpi_bus_find_device_by_name(const char *name) 1133 { 1134 return bus_find_device_by_name(&acpi_bus_type, NULL, name); 1135 } 1136 EXPORT_SYMBOL_GPL(acpi_bus_find_device_by_name); 1137 1138 struct acpi_dev_walk_context { 1139 int (*fn)(struct acpi_device *, void *); 1140 void *data; 1141 }; 1142 1143 static int acpi_dev_for_one_check(struct device *dev, void *context) 1144 { 1145 struct acpi_dev_walk_context *adwc = context; 1146 1147 if (dev->bus != &acpi_bus_type) 1148 return 0; 1149 1150 return adwc->fn(to_acpi_device(dev), adwc->data); 1151 } 1152 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); 1153 1154 int acpi_dev_for_each_child(struct acpi_device *adev, 1155 int (*fn)(struct acpi_device *, void *), void *data) 1156 { 1157 struct acpi_dev_walk_context adwc = { 1158 .fn = fn, 1159 .data = data, 1160 }; 1161 1162 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1163 } 1164 1165 int acpi_dev_for_each_child_reverse(struct acpi_device *adev, 1166 int (*fn)(struct acpi_device *, void *), 1167 void *data) 1168 { 1169 struct acpi_dev_walk_context adwc = { 1170 .fn = fn, 1171 .data = data, 1172 }; 1173 1174 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); 1175 } 1176 1177 /* -------------------------------------------------------------------------- 1178 Initialization/Cleanup 1179 -------------------------------------------------------------------------- */ 1180 1181 static int __init acpi_bus_init_irq(void) 1182 { 1183 acpi_status status; 1184 char *message = NULL; 1185 1186 1187 /* 1188 * Let the system know what interrupt model we are using by 1189 * evaluating the \_PIC object, if exists. 1190 */ 1191 1192 switch (acpi_irq_model) { 1193 case ACPI_IRQ_MODEL_PIC: 1194 message = "PIC"; 1195 break; 1196 case ACPI_IRQ_MODEL_IOAPIC: 1197 message = "IOAPIC"; 1198 break; 1199 case ACPI_IRQ_MODEL_IOSAPIC: 1200 message = "IOSAPIC"; 1201 break; 1202 case ACPI_IRQ_MODEL_GIC: 1203 message = "GIC"; 1204 break; 1205 case ACPI_IRQ_MODEL_GIC_V5: 1206 message = "GICv5"; 1207 break; 1208 case ACPI_IRQ_MODEL_PLATFORM: 1209 message = "platform specific model"; 1210 break; 1211 case ACPI_IRQ_MODEL_LPIC: 1212 message = "LPIC"; 1213 break; 1214 case ACPI_IRQ_MODEL_RINTC: 1215 message = "RINTC"; 1216 break; 1217 default: 1218 pr_info("Unknown interrupt routing model\n"); 1219 return -ENODEV; 1220 } 1221 1222 pr_info("Using %s for interrupt routing\n", message); 1223 1224 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1225 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1226 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1227 return -ENODEV; 1228 } 1229 1230 return 0; 1231 } 1232 1233 /** 1234 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1235 * 1236 * The ACPI tables are accessible after this, but the handling of events has not 1237 * been initialized and the global lock is not available yet, so AML should not 1238 * be executed at this point. 1239 * 1240 * Doing this before switching the EFI runtime services to virtual mode allows 1241 * the EfiBootServices memory to be freed slightly earlier on boot. 1242 */ 1243 void __init acpi_early_init(void) 1244 { 1245 acpi_status status; 1246 1247 if (acpi_disabled) 1248 return; 1249 1250 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1251 1252 /* enable workarounds, unless strict ACPI spec. compliance */ 1253 if (!acpi_strict) 1254 acpi_gbl_enable_interpreter_slack = TRUE; 1255 1256 acpi_permanent_mmap = true; 1257 1258 #ifdef CONFIG_X86 1259 /* 1260 * If the machine falls into the DMI check table, 1261 * DSDT will be copied to memory. 1262 * Note that calling dmi_check_system() here on other architectures 1263 * would not be OK because only x86 initializes dmi early enough. 1264 * Thankfully only x86 systems need such quirks for now. 1265 */ 1266 dmi_check_system(dsdt_dmi_table); 1267 #endif 1268 1269 status = acpi_reallocate_root_table(); 1270 if (ACPI_FAILURE(status)) { 1271 pr_err("Unable to reallocate ACPI tables\n"); 1272 goto error0; 1273 } 1274 1275 status = acpi_initialize_subsystem(); 1276 if (ACPI_FAILURE(status)) { 1277 pr_err("Unable to initialize the ACPI Interpreter\n"); 1278 goto error0; 1279 } 1280 1281 #ifdef CONFIG_X86 1282 if (!acpi_ioapic) { 1283 /* compatible (0) means level (3) */ 1284 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1285 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1286 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1287 } 1288 /* Set PIC-mode SCI trigger type */ 1289 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1290 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1291 } else { 1292 /* 1293 * now that acpi_gbl_FADT is initialized, 1294 * update it with result from INT_SRC_OVR parsing 1295 */ 1296 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1297 } 1298 #endif 1299 return; 1300 1301 error0: 1302 disable_acpi(); 1303 } 1304 1305 /** 1306 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1307 * 1308 * Switch over the platform to the ACPI mode (if possible). 1309 * 1310 * Doing this too early is generally unsafe, but at the same time it needs to be 1311 * done before all things that really depend on ACPI. The right spot appears to 1312 * be before finalizing the EFI initialization. 1313 */ 1314 void __init acpi_subsystem_init(void) 1315 { 1316 acpi_status status; 1317 1318 if (acpi_disabled) 1319 return; 1320 1321 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1322 if (ACPI_FAILURE(status)) { 1323 pr_err("Unable to enable ACPI\n"); 1324 disable_acpi(); 1325 } else { 1326 /* 1327 * If the system is using ACPI then we can be reasonably 1328 * confident that any regulators are managed by the firmware 1329 * so tell the regulator core it has everything it needs to 1330 * know. 1331 */ 1332 regulator_has_full_constraints(); 1333 } 1334 } 1335 1336 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1337 { 1338 if (event == ACPI_TABLE_EVENT_LOAD) 1339 acpi_scan_table_notify(); 1340 1341 return acpi_sysfs_table_handler(event, table, context); 1342 } 1343 1344 static int __init acpi_bus_init(void) 1345 { 1346 int result; 1347 acpi_status status; 1348 1349 acpi_os_initialize1(); 1350 1351 status = acpi_load_tables(); 1352 if (ACPI_FAILURE(status)) { 1353 pr_err("Unable to load the System Description Tables\n"); 1354 goto error1; 1355 } 1356 1357 /* 1358 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1359 * device is found in the namespace. 1360 * 1361 * This is accomplished by looking for the ECDT table and getting the EC 1362 * parameters out of that. 1363 * 1364 * Do that before calling acpi_initialize_objects() which may trigger EC 1365 * address space accesses. 1366 */ 1367 acpi_ec_ecdt_probe(); 1368 1369 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1370 if (ACPI_FAILURE(status)) { 1371 pr_err("Unable to start the ACPI Interpreter\n"); 1372 goto error1; 1373 } 1374 1375 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1376 if (ACPI_FAILURE(status)) { 1377 pr_err("Unable to initialize ACPI objects\n"); 1378 goto error1; 1379 } 1380 1381 /* 1382 * _OSC method may exist in module level code, 1383 * so it must be run after ACPI_FULL_INITIALIZATION 1384 */ 1385 acpi_bus_osc_negotiate_platform_control(); 1386 acpi_bus_osc_negotiate_usb_control(); 1387 1388 /* 1389 * _PDC control method may load dynamic SSDT tables, 1390 * and we need to install the table handler before that. 1391 */ 1392 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1393 1394 acpi_sysfs_init(); 1395 1396 acpi_early_processor_control_setup(); 1397 1398 /* 1399 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1400 * is necessary to enable it as early as possible. 1401 */ 1402 acpi_ec_dsdt_probe(); 1403 1404 pr_info("Interpreter enabled\n"); 1405 1406 /* Initialize sleep structures */ 1407 acpi_sleep_init(); 1408 1409 /* 1410 * Get the system interrupt model and evaluate \_PIC. 1411 */ 1412 result = acpi_bus_init_irq(); 1413 if (result) 1414 goto error1; 1415 1416 /* 1417 * Register for all standard device notifications. 1418 */ 1419 status = 1420 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1421 &acpi_bus_notify, NULL); 1422 if (ACPI_FAILURE(status)) { 1423 pr_err("Unable to register for system notifications\n"); 1424 goto error1; 1425 } 1426 1427 /* 1428 * Create the top ACPI proc directory 1429 */ 1430 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1431 1432 result = bus_register(&acpi_bus_type); 1433 if (!result) 1434 return 0; 1435 1436 /* Mimic structured exception handling */ 1437 error1: 1438 acpi_terminate(); 1439 return -ENODEV; 1440 } 1441 1442 struct kobject *acpi_kobj; 1443 EXPORT_SYMBOL_GPL(acpi_kobj); 1444 1445 void __weak __init acpi_arch_init(void) { } 1446 1447 static int __init acpi_init(void) 1448 { 1449 int result; 1450 1451 if (acpi_disabled) { 1452 pr_info("Interpreter disabled.\n"); 1453 return -ENODEV; 1454 } 1455 1456 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1457 if (!acpi_kobj) { 1458 pr_err("Failed to register kobject\n"); 1459 return -ENOMEM; 1460 } 1461 1462 init_prmt(); 1463 acpi_init_pcc(); 1464 result = acpi_bus_init(); 1465 if (result) { 1466 kobject_put(acpi_kobj); 1467 disable_acpi(); 1468 return result; 1469 } 1470 acpi_init_ffh(); 1471 1472 pci_mmcfg_late_init(); 1473 acpi_viot_early_init(); 1474 acpi_hest_init(); 1475 acpi_ghes_init(); 1476 acpi_arch_init(); 1477 acpi_scan_init(); 1478 acpi_ec_init(); 1479 acpi_debugfs_init(); 1480 acpi_sleep_proc_init(); 1481 acpi_wakeup_device_init(); 1482 acpi_debugger_init(); 1483 acpi_setup_sb_notify_handler(); 1484 acpi_viot_init(); 1485 return 0; 1486 } 1487 1488 subsys_initcall(acpi_init); 1489