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; 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; i < bufsize; i++) 399 capbuf[i] &= retbuf[i]; 400 401 if (retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK) { 402 /* 403 * Complain about the unexpected errors and print diagnostic 404 * information related to them. 405 */ 406 acpi_handle_err(handle, "_OSC: errors while processing control request\n"); 407 acpi_handle_err(handle, "_OSC: some features may be missing\n"); 408 acpi_osc_error_check(handle, &guid, rev, &cap, retbuf); 409 } 410 411 out: 412 ACPI_FREE(out_obj); 413 return ret; 414 } 415 416 bool osc_sb_apei_support_acked; 417 418 /* 419 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination 420 * OSPM supports platform coordinated low power idle(LPI) states 421 */ 422 bool osc_pc_lpi_support_confirmed; 423 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); 424 425 /* 426 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': 427 * Starting with ACPI Specification 6.2, all _CPC registers can be in 428 * PCC, System Memory, System IO, or Functional Fixed Hardware address 429 * spaces. OSPM support for this more flexible register space scheme is 430 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. 431 * 432 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: 433 * - PCC or Functional Fixed Hardware address space if defined 434 * - SystemMemory address space (NULL register) if not defined 435 */ 436 bool osc_cpc_flexible_adr_space_confirmed; 437 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed); 438 439 /* 440 * ACPI 6.4 Operating System Capabilities for USB. 441 */ 442 bool osc_sb_native_usb4_support_confirmed; 443 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); 444 445 bool osc_sb_cppc2_support_acked; 446 447 static void acpi_bus_osc_negotiate_platform_control(void) 448 { 449 static const u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 450 u32 capbuf[2], feature_mask; 451 acpi_handle handle; 452 453 feature_mask = OSC_SB_PR3_SUPPORT | OSC_SB_HOTPLUG_OST_SUPPORT | 454 OSC_SB_PCLPI_SUPPORT | OSC_SB_OVER_16_PSTATES_SUPPORT | 455 OSC_SB_GED_SUPPORT | OSC_SB_IRQ_RESOURCE_SOURCE_SUPPORT; 456 457 if (IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_X86)) 458 feature_mask |= OSC_SB_GENERIC_INITIATOR_SUPPORT; 459 460 if (IS_ENABLED(CONFIG_ACPI_CPPC_LIB)) { 461 feature_mask |= OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT | 462 OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 463 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO)) 464 feature_mask |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT; 465 } 466 467 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR)) 468 feature_mask |= OSC_SB_PAD_SUPPORT; 469 470 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR)) 471 feature_mask |= OSC_SB_PPC_OST_SUPPORT; 472 473 if (IS_ENABLED(CONFIG_ACPI_THERMAL)) 474 feature_mask |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT; 475 476 if (IS_ENABLED(CONFIG_ACPI_BATTERY)) 477 feature_mask |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT; 478 479 if (IS_ENABLED(CONFIG_ACPI_PRMT)) 480 feature_mask |= OSC_SB_PRM_SUPPORT; 481 482 if (IS_ENABLED(CONFIG_ACPI_FFH)) 483 feature_mask |= OSC_SB_FFH_OPR_SUPPORT; 484 485 if (IS_ENABLED(CONFIG_USB4)) 486 feature_mask |= OSC_SB_NATIVE_USB4_SUPPORT; 487 488 if (!ghes_disable) 489 feature_mask |= OSC_SB_APEI_SUPPORT; 490 491 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 492 return; 493 494 capbuf[OSC_SUPPORT_DWORD] = feature_mask; 495 496 acpi_handle_info(handle, "platform _OSC: OS support mask [%08x]\n", feature_mask); 497 498 if (acpi_osc_handshake(handle, sb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf))) 499 return; 500 501 feature_mask = capbuf[OSC_SUPPORT_DWORD]; 502 503 acpi_handle_info(handle, "platform _OSC: OS control mask [%08x]\n", feature_mask); 504 505 osc_sb_cppc2_support_acked = feature_mask & OSC_SB_CPCV2_SUPPORT; 506 osc_sb_apei_support_acked = feature_mask & OSC_SB_APEI_SUPPORT; 507 osc_pc_lpi_support_confirmed = feature_mask & OSC_SB_PCLPI_SUPPORT; 508 osc_sb_native_usb4_support_confirmed = feature_mask & OSC_SB_NATIVE_USB4_SUPPORT; 509 osc_cpc_flexible_adr_space_confirmed = feature_mask & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; 510 } 511 512 /* 513 * Native control of USB4 capabilities. If any of the tunneling bits is 514 * set it means OS is in control and we use software based connection 515 * manager. 516 */ 517 u32 osc_sb_native_usb4_control; 518 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control); 519 520 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) 521 { 522 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg, 523 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-', 524 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-', 525 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-', 526 (bits & OSC_USB_XDOMAIN) ? '+' : '-'); 527 } 528 529 static void acpi_bus_osc_negotiate_usb_control(void) 530 { 531 static const u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A"; 532 u32 capbuf[3], control; 533 acpi_handle handle; 534 535 if (!osc_sb_native_usb4_support_confirmed) 536 return; 537 538 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 539 return; 540 541 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING | 542 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN; 543 544 capbuf[OSC_SUPPORT_DWORD] = 0; 545 capbuf[OSC_CONTROL_DWORD] = control; 546 547 if (acpi_osc_handshake(handle, sb_usb_uuid_str, 1, capbuf, ARRAY_SIZE(capbuf))) 548 return; 549 550 osc_sb_native_usb4_control = capbuf[OSC_CONTROL_DWORD]; 551 552 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control); 553 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls", osc_sb_native_usb4_control); 554 } 555 556 /* -------------------------------------------------------------------------- 557 Notification Handling 558 -------------------------------------------------------------------------- */ 559 560 /** 561 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler 562 * @handle: Target ACPI object. 563 * @type: Notification type. 564 * @data: Ignored. 565 * 566 * This only handles notifications related to device hotplug. 567 */ 568 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 569 { 570 struct acpi_device *adev; 571 572 switch (type) { 573 case ACPI_NOTIFY_BUS_CHECK: 574 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 575 break; 576 577 case ACPI_NOTIFY_DEVICE_CHECK: 578 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 579 break; 580 581 case ACPI_NOTIFY_DEVICE_WAKE: 582 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 583 return; 584 585 case ACPI_NOTIFY_EJECT_REQUEST: 586 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 587 break; 588 589 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 590 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 591 /* TBD: Exactly what does 'light' mean? */ 592 return; 593 594 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 595 acpi_handle_err(handle, "Device cannot be configured due " 596 "to a frequency mismatch\n"); 597 return; 598 599 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 600 acpi_handle_err(handle, "Device cannot be configured due " 601 "to a bus mode mismatch\n"); 602 return; 603 604 case ACPI_NOTIFY_POWER_FAULT: 605 acpi_handle_err(handle, "Device has suffered a power fault\n"); 606 return; 607 608 default: 609 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 610 return; 611 } 612 613 adev = acpi_get_acpi_dev(handle); 614 615 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 616 return; 617 618 acpi_put_acpi_dev(adev); 619 620 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); 621 } 622 623 static void acpi_notify_device(acpi_handle handle, u32 event, void *data) 624 { 625 struct acpi_device *device = data; 626 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver); 627 628 acpi_drv->ops.notify(device, event); 629 } 630 631 static int acpi_device_install_notify_handler(struct acpi_device *device, 632 struct acpi_driver *acpi_drv) 633 { 634 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 635 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 636 acpi_status status; 637 638 status = acpi_install_notify_handler(device->handle, type, 639 acpi_notify_device, device); 640 if (ACPI_FAILURE(status)) 641 return -EINVAL; 642 643 return 0; 644 } 645 646 static void acpi_device_remove_notify_handler(struct acpi_device *device, 647 struct acpi_driver *acpi_drv) 648 { 649 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ? 650 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY; 651 652 acpi_remove_notify_handler(device->handle, type, 653 acpi_notify_device); 654 655 acpi_os_wait_events_complete(); 656 } 657 658 int acpi_dev_install_notify_handler(struct acpi_device *adev, 659 u32 handler_type, 660 acpi_notify_handler handler, void *context) 661 { 662 acpi_status status; 663 664 status = acpi_install_notify_handler(adev->handle, handler_type, 665 handler, context); 666 if (ACPI_FAILURE(status)) 667 return -ENODEV; 668 669 return 0; 670 } 671 EXPORT_SYMBOL_GPL(acpi_dev_install_notify_handler); 672 673 void acpi_dev_remove_notify_handler(struct acpi_device *adev, 674 u32 handler_type, 675 acpi_notify_handler handler) 676 { 677 acpi_remove_notify_handler(adev->handle, handler_type, handler); 678 acpi_os_wait_events_complete(); 679 } 680 EXPORT_SYMBOL_GPL(acpi_dev_remove_notify_handler); 681 682 struct acpi_notify_handler_devres { 683 struct acpi_device *adev; 684 acpi_notify_handler handler; 685 u32 handler_type; 686 }; 687 688 static void devm_acpi_notify_handler_release(struct device *dev, void *res) 689 { 690 struct acpi_notify_handler_devres *dr = res; 691 692 acpi_dev_remove_notify_handler(dr->adev, dr->handler_type, dr->handler); 693 } 694 695 /** 696 * devm_acpi_install_notify_handler - Install an ACPI notify handler for a 697 * managed device 698 * @dev: Device to install a notify handler for 699 * @handler_type: Type of the notify handler 700 * @handler: Handler function to install 701 * @context: Data passed back to the handler function 702 * 703 * This function performs the same function as acpi_dev_install_notify_handler() 704 * called for the ACPI companion of @dev with the same @handler_type, @handler, 705 * and @context arguments, but the ACPI notify handler installed by it will be 706 * automatically removed on driver detach. 707 * 708 * Callers should ensure that all resources used by @handler have been allocated 709 * prior to invoking this function, in which case those resources should be 710 * devres-managed so that they won't be released before the notify handler 711 * removal. Otherwise, special synchronization between @handler and the 712 * management of those resources is required. 713 * 714 * When the request fails, an error message is printed. Don't add extra error 715 * messages at the call sites. 716 * 717 * Return: 0 on success or a negative error number. 718 */ 719 int devm_acpi_install_notify_handler(struct device *dev, u32 handler_type, 720 acpi_notify_handler handler, void *context) 721 { 722 struct acpi_notify_handler_devres *dr; 723 struct acpi_device *adev; 724 int ret; 725 726 adev = ACPI_COMPANION(dev); 727 if (!adev) 728 return dev_err_probe(dev, -ENODEV, "No ACPI companion\n"); 729 730 dr = devres_alloc(devm_acpi_notify_handler_release, sizeof(*dr), GFP_KERNEL); 731 if (!dr) 732 return -ENOMEM; 733 734 ret = acpi_dev_install_notify_handler(adev, handler_type, handler, context); 735 if (ret) { 736 devres_free(dr); 737 return dev_err_probe(dev, ret, "Failed to install an ACPI notify handler\n"); 738 } 739 740 dr->adev = adev; 741 dr->handler = handler; 742 dr->handler_type = handler_type; 743 devres_add(dev, dr); 744 745 return 0; 746 } 747 EXPORT_SYMBOL_GPL(devm_acpi_install_notify_handler); 748 749 /* Handle events targeting \_SB device (at present only graceful shutdown) */ 750 751 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 752 #define ACPI_SB_INDICATE_INTERVAL 10000 753 754 static void sb_notify_work(struct work_struct *dummy) 755 { 756 acpi_handle sb_handle; 757 758 orderly_poweroff(true); 759 760 /* 761 * After initiating graceful shutdown, the ACPI spec requires OSPM 762 * to evaluate _OST method once every 10seconds to indicate that 763 * the shutdown is in progress 764 */ 765 acpi_get_handle(NULL, "\\_SB", &sb_handle); 766 while (1) { 767 pr_info("Graceful shutdown in progress.\n"); 768 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, 769 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); 770 msleep(ACPI_SB_INDICATE_INTERVAL); 771 } 772 } 773 774 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) 775 { 776 static DECLARE_WORK(acpi_sb_work, sb_notify_work); 777 778 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { 779 if (!work_busy(&acpi_sb_work)) 780 schedule_work(&acpi_sb_work); 781 } else { 782 pr_warn("event %x is not supported by \\_SB device\n", event); 783 } 784 } 785 786 static int __init acpi_setup_sb_notify_handler(void) 787 { 788 acpi_handle sb_handle; 789 790 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) 791 return -ENXIO; 792 793 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, 794 acpi_sb_notify, NULL))) 795 return -EINVAL; 796 797 return 0; 798 } 799 800 /* -------------------------------------------------------------------------- 801 Device Matching 802 -------------------------------------------------------------------------- */ 803 804 /** 805 * acpi_get_first_physical_node - Get first physical node of an ACPI device 806 * @adev: ACPI device in question 807 * 808 * Return: First physical node of ACPI device @adev 809 */ 810 struct device *acpi_get_first_physical_node(struct acpi_device *adev) 811 { 812 struct mutex *physical_node_lock = &adev->physical_node_lock; 813 struct device *phys_dev; 814 815 mutex_lock(physical_node_lock); 816 if (list_empty(&adev->physical_node_list)) { 817 phys_dev = NULL; 818 } else { 819 const struct acpi_device_physical_node *node; 820 821 node = list_first_entry(&adev->physical_node_list, 822 struct acpi_device_physical_node, node); 823 824 phys_dev = node->dev; 825 } 826 mutex_unlock(physical_node_lock); 827 return phys_dev; 828 } 829 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node); 830 831 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, 832 const struct device *dev) 833 { 834 const struct device *phys_dev = acpi_get_first_physical_node(adev); 835 836 return phys_dev && phys_dev == dev ? adev : NULL; 837 } 838 839 /** 840 * acpi_device_is_first_physical_node - Is given dev first physical node 841 * @adev: ACPI companion device 842 * @dev: Physical device to check 843 * 844 * Function checks if given @dev is the first physical devices attached to 845 * the ACPI companion device. This distinction is needed in some cases 846 * where the same companion device is shared between many physical devices. 847 * 848 * Note that the caller have to provide valid @adev pointer. 849 */ 850 bool acpi_device_is_first_physical_node(struct acpi_device *adev, 851 const struct device *dev) 852 { 853 return !!acpi_primary_dev_companion(adev, dev); 854 } 855 856 /* 857 * acpi_companion_match() - Can we match via ACPI companion device 858 * @dev: Device in question 859 * 860 * Check if the given device has an ACPI companion and if that companion has 861 * a valid list of PNP IDs, and if the device is the first (primary) physical 862 * device associated with it. Return the companion pointer if that's the case 863 * or NULL otherwise. 864 * 865 * If multiple physical devices are attached to a single ACPI companion, we need 866 * to be careful. The usage scenario for this kind of relationship is that all 867 * of the physical devices in question use resources provided by the ACPI 868 * companion. A typical case is an MFD device where all the sub-devices share 869 * the parent's ACPI companion. In such cases we can only allow the primary 870 * (first) physical device to be matched with the help of the companion's PNP 871 * IDs. 872 * 873 * Additional physical devices sharing the ACPI companion can still use 874 * resources available from it but they will be matched normally using functions 875 * provided by their bus types (and analogously for their modalias). 876 */ 877 const struct acpi_device *acpi_companion_match(const struct device *dev) 878 { 879 struct acpi_device *adev; 880 881 adev = ACPI_COMPANION(dev); 882 if (!adev) 883 return NULL; 884 885 if (list_empty(&adev->pnp.ids)) 886 return NULL; 887 888 return acpi_primary_dev_companion(adev, dev); 889 } 890 891 /** 892 * acpi_of_match_device - Match device object using the "compatible" property. 893 * @adev: ACPI device object to match. 894 * @of_match_table: List of device IDs to match against. 895 * @of_id: OF ID if matched 896 * 897 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of 898 * identifiers and a _DSD object with the "compatible" property, use that 899 * property to match against the given list of identifiers. 900 */ 901 bool acpi_of_match_device(const struct acpi_device *adev, 902 const struct of_device_id *of_match_table, 903 const struct of_device_id **of_id) 904 { 905 const union acpi_object *of_compatible, *obj; 906 int i, nval; 907 908 if (!adev) 909 return false; 910 911 of_compatible = adev->data.of_compatible; 912 if (!of_match_table || !of_compatible) 913 return false; 914 915 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 916 nval = of_compatible->package.count; 917 obj = of_compatible->package.elements; 918 } else { /* Must be ACPI_TYPE_STRING. */ 919 nval = 1; 920 obj = of_compatible; 921 } 922 /* Now we can look for the driver DT compatible strings */ 923 for (i = 0; i < nval; i++, obj++) { 924 const struct of_device_id *id; 925 926 for (id = of_match_table; id->compatible[0]; id++) 927 if (!strcasecmp(obj->string.pointer, id->compatible)) { 928 if (of_id) 929 *of_id = id; 930 return true; 931 } 932 } 933 934 return false; 935 } 936 937 static bool acpi_of_modalias(struct acpi_device *adev, 938 char *modalias, size_t len) 939 { 940 const union acpi_object *of_compatible; 941 const union acpi_object *obj; 942 const char *str, *chr; 943 944 of_compatible = adev->data.of_compatible; 945 if (!of_compatible) 946 return false; 947 948 if (of_compatible->type == ACPI_TYPE_PACKAGE) 949 obj = of_compatible->package.elements; 950 else /* Must be ACPI_TYPE_STRING. */ 951 obj = of_compatible; 952 953 str = obj->string.pointer; 954 chr = strchr(str, ','); 955 strscpy(modalias, chr ? chr + 1 : str, len); 956 957 return true; 958 } 959 960 /** 961 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID 962 * @adev: ACPI device object to match 963 * @default_id: ID string to use as default if no compatible string found 964 * @modalias: Pointer to buffer that modalias value will be copied into 965 * @len: Length of modalias buffer 966 * 967 * This is a counterpart of of_alias_from_compatible() for struct acpi_device 968 * objects. If there is a compatible string for @adev, it will be copied to 969 * @modalias with the vendor prefix stripped; otherwise, @default_id will be 970 * used. 971 */ 972 void acpi_set_modalias(struct acpi_device *adev, const char *default_id, 973 char *modalias, size_t len) 974 { 975 if (!acpi_of_modalias(adev, modalias, len)) 976 strscpy(modalias, default_id, len); 977 } 978 EXPORT_SYMBOL_GPL(acpi_set_modalias); 979 980 static bool __acpi_match_device_cls(const struct acpi_device_id *id, 981 struct acpi_hardware_id *hwid) 982 { 983 int i, msk, byte_shift; 984 char buf[3]; 985 986 if (!id->cls) 987 return false; 988 989 /* Apply class-code bitmask, before checking each class-code byte */ 990 for (i = 1; i <= 3; i++) { 991 byte_shift = 8 * (3 - i); 992 msk = (id->cls_msk >> byte_shift) & 0xFF; 993 if (!msk) 994 continue; 995 996 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk); 997 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2)) 998 return false; 999 } 1000 return true; 1001 } 1002 1003 static bool __acpi_match_device(const struct acpi_device *device, 1004 const struct acpi_device_id *acpi_ids, 1005 const struct of_device_id *of_ids, 1006 const struct acpi_device_id **acpi_id, 1007 const struct of_device_id **of_id) 1008 { 1009 const struct acpi_device_id *id; 1010 struct acpi_hardware_id *hwid; 1011 1012 /* 1013 * If the device is not present, it is unnecessary to load device 1014 * driver for it. 1015 */ 1016 if (!device || !device->status.present) 1017 return false; 1018 1019 list_for_each_entry(hwid, &device->pnp.ids, list) { 1020 /* First, check the ACPI/PNP IDs provided by the caller. */ 1021 if (acpi_ids) { 1022 for (id = acpi_ids; id->id[0] || id->cls; id++) { 1023 if (id->id[0] && !strcmp((char *)id->id, hwid->id)) 1024 goto out_acpi_match; 1025 if (id->cls && __acpi_match_device_cls(id, hwid)) 1026 goto out_acpi_match; 1027 } 1028 } 1029 1030 /* 1031 * Next, check ACPI_DT_NAMESPACE_HID and try to match the 1032 * "compatible" property if found. 1033 */ 1034 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)) 1035 return acpi_of_match_device(device, of_ids, of_id); 1036 } 1037 return false; 1038 1039 out_acpi_match: 1040 if (acpi_id) 1041 *acpi_id = id; 1042 return true; 1043 } 1044 1045 /** 1046 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs 1047 * @ids: Array of struct acpi_device_id objects to match against. 1048 * @adev: The ACPI device pointer to match. 1049 * 1050 * Match the ACPI device @adev against a given list of ACPI IDs @ids. 1051 * 1052 * Return: 1053 * a pointer to the first matching ACPI ID on success or %NULL on failure. 1054 */ 1055 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, 1056 const struct acpi_device *adev) 1057 { 1058 const struct acpi_device_id *id = NULL; 1059 1060 __acpi_match_device(adev, ids, NULL, &id, NULL); 1061 return id; 1062 } 1063 EXPORT_SYMBOL_GPL(acpi_match_acpi_device); 1064 1065 /** 1066 * acpi_match_device - Match a struct device against a given list of ACPI IDs 1067 * @ids: Array of struct acpi_device_id object to match against. 1068 * @dev: The device structure to match. 1069 * 1070 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 1071 * object for that handle and use that object to match against a given list of 1072 * device IDs. 1073 * 1074 * Return a pointer to the first matching ID on success or %NULL on failure. 1075 */ 1076 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 1077 const struct device *dev) 1078 { 1079 return acpi_match_acpi_device(ids, acpi_companion_match(dev)); 1080 } 1081 EXPORT_SYMBOL_GPL(acpi_match_device); 1082 1083 const void *acpi_device_get_match_data(const struct device *dev) 1084 { 1085 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table; 1086 const struct of_device_id *of_ids = dev->driver->of_match_table; 1087 const struct acpi_device *adev = acpi_companion_match(dev); 1088 const struct acpi_device_id *acpi_id = NULL; 1089 const struct of_device_id *of_id = NULL; 1090 1091 if (!__acpi_match_device(adev, acpi_ids, of_ids, &acpi_id, &of_id)) 1092 return NULL; 1093 1094 if (acpi_id) 1095 return (const void *)acpi_id->driver_data; 1096 1097 if (of_id) 1098 return of_id->data; 1099 1100 return NULL; 1101 } 1102 EXPORT_SYMBOL_GPL(acpi_device_get_match_data); 1103 1104 int acpi_match_device_ids(struct acpi_device *device, 1105 const struct acpi_device_id *ids) 1106 { 1107 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT; 1108 } 1109 EXPORT_SYMBOL(acpi_match_device_ids); 1110 1111 bool acpi_driver_match_device(struct device *dev, 1112 const struct device_driver *drv) 1113 { 1114 const struct acpi_device_id *acpi_ids = drv->acpi_match_table; 1115 const struct of_device_id *of_ids = drv->of_match_table; 1116 1117 if (!acpi_ids) 1118 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL); 1119 1120 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL); 1121 } 1122 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 1123 1124 /* -------------------------------------------------------------------------- 1125 ACPI Driver Management 1126 -------------------------------------------------------------------------- */ 1127 1128 /** 1129 * __acpi_bus_register_driver - register a driver with the ACPI bus 1130 * @driver: driver being registered 1131 * @owner: owning module/driver 1132 * 1133 * Registers a driver with the ACPI bus. Searches the namespace for all 1134 * devices that match the driver's criteria and binds. Returns zero for 1135 * success or a negative error status for failure. 1136 */ 1137 int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner) 1138 { 1139 if (acpi_disabled) 1140 return -ENODEV; 1141 driver->drv.name = driver->name; 1142 driver->drv.bus = &acpi_bus_type; 1143 driver->drv.owner = owner; 1144 1145 return driver_register(&driver->drv); 1146 } 1147 1148 EXPORT_SYMBOL(__acpi_bus_register_driver); 1149 1150 /** 1151 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 1152 * @driver: driver to unregister 1153 * 1154 * Unregisters a driver with the ACPI bus. Searches the namespace for all 1155 * devices that match the driver's criteria and unbinds. 1156 */ 1157 void acpi_bus_unregister_driver(struct acpi_driver *driver) 1158 { 1159 driver_unregister(&driver->drv); 1160 } 1161 1162 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1163 1164 /* -------------------------------------------------------------------------- 1165 ACPI Bus operations 1166 -------------------------------------------------------------------------- */ 1167 1168 static int acpi_bus_match(struct device *dev, const struct device_driver *drv) 1169 { 1170 struct acpi_device *acpi_dev = to_acpi_device(dev); 1171 const struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1172 1173 return acpi_dev->flags.match_driver 1174 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1175 } 1176 1177 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) 1178 { 1179 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1180 } 1181 1182 static int acpi_device_probe(struct device *dev) 1183 { 1184 struct acpi_device *acpi_dev = to_acpi_device(dev); 1185 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1186 int ret; 1187 1188 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1189 return -EINVAL; 1190 1191 if (!acpi_drv->ops.add) 1192 return -ENOSYS; 1193 1194 ret = acpi_drv->ops.add(acpi_dev); 1195 if (ret) { 1196 acpi_dev->driver_data = NULL; 1197 return ret; 1198 } 1199 1200 pr_debug("Driver [%s] successfully bound to device [%s]\n", 1201 acpi_drv->name, acpi_dev->pnp.bus_id); 1202 1203 if (acpi_drv->ops.notify) { 1204 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv); 1205 if (ret) { 1206 if (acpi_drv->ops.remove) 1207 acpi_drv->ops.remove(acpi_dev); 1208 1209 acpi_dev->driver_data = NULL; 1210 return ret; 1211 } 1212 } 1213 1214 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name, 1215 acpi_dev->pnp.bus_id); 1216 1217 get_device(dev); 1218 return 0; 1219 } 1220 1221 static void acpi_device_remove(struct device *dev) 1222 { 1223 struct acpi_device *acpi_dev = to_acpi_device(dev); 1224 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1225 1226 if (acpi_drv->ops.notify) 1227 acpi_device_remove_notify_handler(acpi_dev, acpi_drv); 1228 1229 if (acpi_drv->ops.remove) 1230 acpi_drv->ops.remove(acpi_dev); 1231 1232 acpi_dev->driver_data = NULL; 1233 1234 put_device(dev); 1235 } 1236 1237 const struct bus_type acpi_bus_type = { 1238 .name = "acpi", 1239 .match = acpi_bus_match, 1240 .probe = acpi_device_probe, 1241 .remove = acpi_device_remove, 1242 .uevent = acpi_device_uevent, 1243 }; 1244 1245 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) 1246 { 1247 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn); 1248 } 1249 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev); 1250 1251 struct acpi_dev_walk_context { 1252 int (*fn)(struct acpi_device *, void *); 1253 void *data; 1254 }; 1255 1256 static int acpi_dev_for_one_check(struct device *dev, void *context) 1257 { 1258 struct acpi_dev_walk_context *adwc = context; 1259 1260 if (dev->bus != &acpi_bus_type) 1261 return 0; 1262 1263 return adwc->fn(to_acpi_device(dev), adwc->data); 1264 } 1265 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child); 1266 1267 int acpi_dev_for_each_child(struct acpi_device *adev, 1268 int (*fn)(struct acpi_device *, void *), void *data) 1269 { 1270 struct acpi_dev_walk_context adwc = { 1271 .fn = fn, 1272 .data = data, 1273 }; 1274 1275 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check); 1276 } 1277 1278 int acpi_dev_for_each_child_reverse(struct acpi_device *adev, 1279 int (*fn)(struct acpi_device *, void *), 1280 void *data) 1281 { 1282 struct acpi_dev_walk_context adwc = { 1283 .fn = fn, 1284 .data = data, 1285 }; 1286 1287 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check); 1288 } 1289 1290 /* -------------------------------------------------------------------------- 1291 Initialization/Cleanup 1292 -------------------------------------------------------------------------- */ 1293 1294 static int __init acpi_bus_init_irq(void) 1295 { 1296 acpi_status status; 1297 char *message = NULL; 1298 1299 1300 /* 1301 * Let the system know what interrupt model we are using by 1302 * evaluating the \_PIC object, if exists. 1303 */ 1304 1305 switch (acpi_irq_model) { 1306 case ACPI_IRQ_MODEL_PIC: 1307 message = "PIC"; 1308 break; 1309 case ACPI_IRQ_MODEL_IOAPIC: 1310 message = "IOAPIC"; 1311 break; 1312 case ACPI_IRQ_MODEL_IOSAPIC: 1313 message = "IOSAPIC"; 1314 break; 1315 case ACPI_IRQ_MODEL_GIC: 1316 message = "GIC"; 1317 break; 1318 case ACPI_IRQ_MODEL_GIC_V5: 1319 message = "GICv5"; 1320 break; 1321 case ACPI_IRQ_MODEL_PLATFORM: 1322 message = "platform specific model"; 1323 break; 1324 case ACPI_IRQ_MODEL_LPIC: 1325 message = "LPIC"; 1326 break; 1327 case ACPI_IRQ_MODEL_RINTC: 1328 message = "RINTC"; 1329 break; 1330 default: 1331 pr_info("Unknown interrupt routing model\n"); 1332 return -ENODEV; 1333 } 1334 1335 pr_info("Using %s for interrupt routing\n", message); 1336 1337 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 1338 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 1339 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status)); 1340 return -ENODEV; 1341 } 1342 1343 return 0; 1344 } 1345 1346 /** 1347 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. 1348 * 1349 * The ACPI tables are accessible after this, but the handling of events has not 1350 * been initialized and the global lock is not available yet, so AML should not 1351 * be executed at this point. 1352 * 1353 * Doing this before switching the EFI runtime services to virtual mode allows 1354 * the EfiBootServices memory to be freed slightly earlier on boot. 1355 */ 1356 void __init acpi_early_init(void) 1357 { 1358 acpi_status status; 1359 1360 if (acpi_disabled) 1361 return; 1362 1363 pr_info("Core revision %08x\n", ACPI_CA_VERSION); 1364 1365 /* enable workarounds, unless strict ACPI spec. compliance */ 1366 if (!acpi_strict) 1367 acpi_gbl_enable_interpreter_slack = TRUE; 1368 1369 acpi_permanent_mmap = true; 1370 1371 #ifdef CONFIG_X86 1372 /* 1373 * If the machine falls into the DMI check table, 1374 * DSDT will be copied to memory. 1375 * Note that calling dmi_check_system() here on other architectures 1376 * would not be OK because only x86 initializes dmi early enough. 1377 * Thankfully only x86 systems need such quirks for now. 1378 */ 1379 dmi_check_system(dsdt_dmi_table); 1380 #endif 1381 1382 status = acpi_reallocate_root_table(); 1383 if (ACPI_FAILURE(status)) { 1384 pr_err("Unable to reallocate ACPI tables\n"); 1385 goto error0; 1386 } 1387 1388 status = acpi_initialize_subsystem(); 1389 if (ACPI_FAILURE(status)) { 1390 pr_err("Unable to initialize the ACPI Interpreter\n"); 1391 goto error0; 1392 } 1393 1394 #ifdef CONFIG_X86 1395 if (!acpi_ioapic) { 1396 /* compatible (0) means level (3) */ 1397 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 1398 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 1399 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 1400 } 1401 /* Set PIC-mode SCI trigger type */ 1402 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 1403 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 1404 } else { 1405 /* 1406 * now that acpi_gbl_FADT is initialized, 1407 * update it with result from INT_SRC_OVR parsing 1408 */ 1409 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 1410 } 1411 #endif 1412 return; 1413 1414 error0: 1415 disable_acpi(); 1416 } 1417 1418 /** 1419 * acpi_subsystem_init - Finalize the early initialization of ACPI. 1420 * 1421 * Switch over the platform to the ACPI mode (if possible). 1422 * 1423 * Doing this too early is generally unsafe, but at the same time it needs to be 1424 * done before all things that really depend on ACPI. The right spot appears to 1425 * be before finalizing the EFI initialization. 1426 */ 1427 void __init acpi_subsystem_init(void) 1428 { 1429 acpi_status status; 1430 1431 if (acpi_disabled) 1432 return; 1433 1434 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 1435 if (ACPI_FAILURE(status)) { 1436 pr_err("Unable to enable ACPI\n"); 1437 disable_acpi(); 1438 } else { 1439 /* 1440 * If the system is using ACPI then we can be reasonably 1441 * confident that any regulators are managed by the firmware 1442 * so tell the regulator core it has everything it needs to 1443 * know. 1444 */ 1445 regulator_has_full_constraints(); 1446 } 1447 } 1448 1449 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) 1450 { 1451 if (event == ACPI_TABLE_EVENT_LOAD) 1452 acpi_scan_table_notify(); 1453 1454 return acpi_sysfs_table_handler(event, table, context); 1455 } 1456 1457 static int __init acpi_bus_init(void) 1458 { 1459 int result; 1460 acpi_status status; 1461 1462 acpi_os_initialize1(); 1463 1464 status = acpi_load_tables(); 1465 if (ACPI_FAILURE(status)) { 1466 pr_err("Unable to load the System Description Tables\n"); 1467 goto error1; 1468 } 1469 1470 /* 1471 * ACPI 2.0 requires the EC driver to be loaded and work before the EC 1472 * device is found in the namespace. 1473 * 1474 * This is accomplished by looking for the ECDT table and getting the EC 1475 * parameters out of that. 1476 * 1477 * Do that before calling acpi_initialize_objects() which may trigger EC 1478 * address space accesses. 1479 */ 1480 acpi_ec_ecdt_probe(); 1481 1482 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 1483 if (ACPI_FAILURE(status)) { 1484 pr_err("Unable to start the ACPI Interpreter\n"); 1485 goto error1; 1486 } 1487 1488 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1489 if (ACPI_FAILURE(status)) { 1490 pr_err("Unable to initialize ACPI objects\n"); 1491 goto error1; 1492 } 1493 1494 /* 1495 * _OSC method may exist in module level code, 1496 * so it must be run after ACPI_FULL_INITIALIZATION 1497 */ 1498 acpi_bus_osc_negotiate_platform_control(); 1499 acpi_bus_osc_negotiate_usb_control(); 1500 1501 /* 1502 * _PDC control method may load dynamic SSDT tables, 1503 * and we need to install the table handler before that. 1504 */ 1505 status = acpi_install_table_handler(acpi_bus_table_handler, NULL); 1506 1507 acpi_sysfs_init(); 1508 1509 acpi_early_processor_control_setup(); 1510 1511 /* 1512 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1513 * is necessary to enable it as early as possible. 1514 */ 1515 acpi_ec_dsdt_probe(); 1516 1517 pr_info("Interpreter enabled\n"); 1518 1519 /* Initialize sleep structures */ 1520 acpi_sleep_init(); 1521 1522 /* 1523 * Get the system interrupt model and evaluate \_PIC. 1524 */ 1525 result = acpi_bus_init_irq(); 1526 if (result) 1527 goto error1; 1528 1529 /* 1530 * Register for all standard device notifications. 1531 */ 1532 status = 1533 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1534 &acpi_bus_notify, NULL); 1535 if (ACPI_FAILURE(status)) { 1536 pr_err("Unable to register for system notifications\n"); 1537 goto error1; 1538 } 1539 1540 /* 1541 * Create the top ACPI proc directory 1542 */ 1543 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1544 1545 result = bus_register(&acpi_bus_type); 1546 if (!result) 1547 return 0; 1548 1549 /* Mimic structured exception handling */ 1550 error1: 1551 acpi_terminate(); 1552 return -ENODEV; 1553 } 1554 1555 struct kobject *acpi_kobj; 1556 EXPORT_SYMBOL_GPL(acpi_kobj); 1557 1558 void __weak __init acpi_arch_init(void) { } 1559 1560 static int __init acpi_init(void) 1561 { 1562 int result; 1563 1564 if (acpi_disabled) { 1565 pr_info("Interpreter disabled.\n"); 1566 return -ENODEV; 1567 } 1568 1569 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1570 if (!acpi_kobj) { 1571 pr_err("Failed to register kobject\n"); 1572 return -ENOMEM; 1573 } 1574 1575 init_prmt(); 1576 acpi_init_pcc(); 1577 result = acpi_bus_init(); 1578 if (result) { 1579 kobject_put(acpi_kobj); 1580 disable_acpi(); 1581 return result; 1582 } 1583 acpi_init_ffh(); 1584 1585 pci_mmcfg_late_init(); 1586 acpi_viot_early_init(); 1587 acpi_hest_init(); 1588 acpi_ghes_init(); 1589 acpi_arch_init(); 1590 acpi_scan_init(); 1591 acpi_ec_init(); 1592 acpi_debugfs_init(); 1593 acpi_sleep_proc_init(); 1594 acpi_wakeup_device_init(); 1595 acpi_debugger_init(); 1596 acpi_setup_sb_notify_handler(); 1597 acpi_viot_init(); 1598 return 0; 1599 } 1600 1601 subsys_initcall(acpi_init); 1602