1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2/****************************************************************************** 3 * 4 * Module Name: evrgnini- ACPI address_space (op_region) init 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10#include <acpi/acpi.h> 11#include "accommon.h" 12#include "acevents.h" 13#include "acnamesp.h" 14#include "acinterp.h" 15 16#define _COMPONENT ACPI_EVENTS 17ACPI_MODULE_NAME("evrgnini") 18 19/******************************************************************************* 20 * 21 * FUNCTION: acpi_ev_system_memory_region_setup 22 * 23 * PARAMETERS: handle - Region we are interested in 24 * function - Start or stop 25 * handler_context - Address space handler context 26 * region_context - Region specific context 27 * 28 * RETURN: Status 29 * 30 * DESCRIPTION: Setup a system_memory operation region 31 * 32 ******************************************************************************/ 33acpi_status 34acpi_ev_system_memory_region_setup(acpi_handle handle, 35 u32 function, 36 void *handler_context, void **region_context) 37{ 38 union acpi_operand_object *region_desc = 39 (union acpi_operand_object *)handle; 40 struct acpi_mem_space_context *local_region_context; 41 struct acpi_mem_mapping *mm; 42 43 ACPI_FUNCTION_TRACE(ev_system_memory_region_setup); 44 45 if (function == ACPI_REGION_DEACTIVATE) { 46 if (*region_context) { 47 local_region_context = 48 (struct acpi_mem_space_context *)*region_context; 49 50 /* Delete memory mappings if present */ 51 52 while (local_region_context->first_mm) { 53 mm = local_region_context->first_mm; 54 local_region_context->first_mm = mm->next_mm; 55 acpi_os_unmap_memory(mm->logical_address, 56 mm->length); 57 ACPI_FREE(mm); 58 } 59 ACPI_FREE(local_region_context); 60 *region_context = NULL; 61 } 62 return_ACPI_STATUS(AE_OK); 63 } 64 65 /* Create a new context */ 66 67 local_region_context = 68 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context)); 69 if (!(local_region_context)) { 70 return_ACPI_STATUS(AE_NO_MEMORY); 71 } 72 73 /* Save the region length and address for use in the handler */ 74 75 local_region_context->length = region_desc->region.length; 76 local_region_context->address = region_desc->region.address; 77 78 *region_context = local_region_context; 79 return_ACPI_STATUS(AE_OK); 80} 81 82/******************************************************************************* 83 * 84 * FUNCTION: acpi_ev_io_space_region_setup 85 * 86 * PARAMETERS: handle - Region we are interested in 87 * function - Start or stop 88 * handler_context - Address space handler context 89 * region_context - Region specific context 90 * 91 * RETURN: Status 92 * 93 * DESCRIPTION: Setup a IO operation region 94 * 95 ******************************************************************************/ 96 97acpi_status 98acpi_ev_io_space_region_setup(acpi_handle handle, 99 u32 function, 100 void *handler_context, void **region_context) 101{ 102 ACPI_FUNCTION_TRACE(ev_io_space_region_setup); 103 104 if (function == ACPI_REGION_DEACTIVATE) { 105 *region_context = NULL; 106 } else { 107 *region_context = handler_context; 108 } 109 110 return_ACPI_STATUS(AE_OK); 111} 112 113/******************************************************************************* 114 * 115 * FUNCTION: acpi_ev_pci_config_region_setup 116 * 117 * PARAMETERS: handle - Region we are interested in 118 * function - Start or stop 119 * handler_context - Address space handler context 120 * region_context - Region specific context 121 * 122 * RETURN: Status 123 * 124 * DESCRIPTION: Setup a PCI_Config operation region 125 * 126 * MUTEX: Assumes namespace is not locked 127 * 128 ******************************************************************************/ 129 130acpi_status 131acpi_ev_pci_config_region_setup(acpi_handle handle, 132 u32 function, 133 void *handler_context, void **region_context) 134{ 135 acpi_status status = AE_OK; 136 u64 pci_value; 137 struct acpi_pci_id *pci_id = *region_context; 138 union acpi_operand_object *handler_obj; 139 struct acpi_namespace_node *parent_node; 140 struct acpi_namespace_node *pci_root_node; 141 struct acpi_namespace_node *pci_device_node; 142 union acpi_operand_object *region_obj = 143 (union acpi_operand_object *)handle; 144 145 ACPI_FUNCTION_TRACE(ev_pci_config_region_setup); 146 147 handler_obj = region_obj->region.handler; 148 if (!handler_obj) { 149 /* 150 * No installed handler. This shouldn't happen because the dispatch 151 * routine checks before we get here, but we check again just in case. 152 */ 153 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 154 "Attempting to init a region %p, with no handler\n", 155 region_obj)); 156 return_ACPI_STATUS(AE_NOT_EXIST); 157 } 158 159 *region_context = NULL; 160 if (function == ACPI_REGION_DEACTIVATE) { 161 if (pci_id) { 162 ACPI_FREE(pci_id); 163 } 164 return_ACPI_STATUS(status); 165 } 166 167 parent_node = region_obj->region.node->parent; 168 169 /* 170 * Get the _SEG and _BBN values from the device upon which the handler 171 * is installed. 172 * 173 * We need to get the _SEG and _BBN objects relative to the PCI BUS device. 174 * This is the device the handler has been registered to handle. 175 */ 176 177 /* 178 * If the address_space.Node is still pointing to the root, we need 179 * to scan upward for a PCI Root bridge and re-associate the op_region 180 * handlers with that device. 181 */ 182 if (handler_obj->address_space.node == acpi_gbl_root_node) { 183 184 /* Start search from the parent object */ 185 186 pci_root_node = parent_node; 187 while (pci_root_node != acpi_gbl_root_node) { 188 189 /* Get the _HID/_CID in order to detect a root_bridge */ 190 191 if (acpi_ev_is_pci_root_bridge(pci_root_node)) { 192 193 /* Install a handler for this PCI root bridge */ 194 195 status = acpi_install_address_space_handler((acpi_handle)pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL); 196 if (ACPI_FAILURE(status)) { 197 if (status == AE_SAME_HANDLER) { 198 /* 199 * It is OK if the handler is already installed on the 200 * root bridge. Still need to return a context object 201 * for the new PCI_Config operation region, however. 202 */ 203 } else { 204 ACPI_EXCEPTION((AE_INFO, status, 205 "Could not install PciConfig handler " 206 "for Root Bridge %4.4s", 207 acpi_ut_get_node_name 208 (pci_root_node))); 209 } 210 } 211 break; 212 } 213 214 pci_root_node = pci_root_node->parent; 215 } 216 217 /* PCI root bridge not found, use namespace root node */ 218 } else { 219 pci_root_node = handler_obj->address_space.node; 220 } 221 222 /* 223 * If this region is now initialized, we are done. 224 * (install_address_space_handler could have initialized it) 225 */ 226 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 227 return_ACPI_STATUS(AE_OK); 228 } 229 230 /* Region is still not initialized. Create a new context */ 231 232 pci_id = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pci_id)); 233 if (!pci_id) { 234 return_ACPI_STATUS(AE_NO_MEMORY); 235 } 236 237 /* 238 * For PCI_Config space access, we need the segment, bus, device and 239 * function numbers. Acquire them here. 240 * 241 * Find the parent device object. (This allows the operation region to be 242 * within a subscope under the device, such as a control method.) 243 */ 244 pci_device_node = region_obj->region.node; 245 while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) { 246 pci_device_node = pci_device_node->parent; 247 } 248 249 if (!pci_device_node) { 250 ACPI_FREE(pci_id); 251 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 252 } 253 254 /* 255 * Get the PCI device and function numbers from the _ADR object 256 * contained in the parent's scope. 257 */ 258 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, 259 pci_device_node, &pci_value); 260 261 /* 262 * The default is zero, and since the allocation above zeroed the data, 263 * just do nothing on failure. 264 */ 265 if (ACPI_SUCCESS(status)) { 266 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value)); 267 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value)); 268 } 269 270 /* The PCI segment number comes from the _SEG method */ 271 272 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG, 273 pci_root_node, &pci_value); 274 if (ACPI_SUCCESS(status)) { 275 pci_id->segment = ACPI_LOWORD(pci_value); 276 } 277 278 /* The PCI bus number comes from the _BBN method */ 279 280 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN, 281 pci_root_node, &pci_value); 282 if (ACPI_SUCCESS(status)) { 283 pci_id->bus = ACPI_LOWORD(pci_value); 284 } 285 286 /* Complete/update the PCI ID for this device */ 287 288 status = 289 acpi_hw_derive_pci_id(pci_id, pci_root_node, 290 region_obj->region.node); 291 if (ACPI_FAILURE(status)) { 292 ACPI_FREE(pci_id); 293 return_ACPI_STATUS(status); 294 } 295 296 *region_context = pci_id; 297 return_ACPI_STATUS(AE_OK); 298} 299 300/******************************************************************************* 301 * 302 * FUNCTION: acpi_ev_is_pci_root_bridge 303 * 304 * PARAMETERS: node - Device node being examined 305 * 306 * RETURN: TRUE if device is a PCI/PCI-Express Root Bridge 307 * 308 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by 309 * examining the _HID and _CID for the device. 310 * 311 ******************************************************************************/ 312 313u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node) 314{ 315 acpi_status status; 316 struct acpi_pnp_device_id *hid; 317 struct acpi_pnp_device_id_list *cid; 318 u32 i; 319 u8 match; 320 321 /* Get the _HID and check for a PCI Root Bridge */ 322 323 status = acpi_ut_execute_HID(node, &hid); 324 if (ACPI_FAILURE(status)) { 325 return (FALSE); 326 } 327 328 match = acpi_ut_is_pci_root_bridge(hid->string); 329 ACPI_FREE(hid); 330 331 if (match) { 332 return (TRUE); 333 } 334 335 /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */ 336 337 status = acpi_ut_execute_CID(node, &cid); 338 if (ACPI_FAILURE(status)) { 339 return (FALSE); 340 } 341 342 /* Check all _CIDs in the returned list */ 343 344 for (i = 0; i < cid->count; i++) { 345 if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) { 346 ACPI_FREE(cid); 347 return (TRUE); 348 } 349 } 350 351 ACPI_FREE(cid); 352 return (FALSE); 353} 354 355/******************************************************************************* 356 * 357 * FUNCTION: acpi_ev_pci_bar_region_setup 358 * 359 * PARAMETERS: handle - Region we are interested in 360 * function - Start or stop 361 * handler_context - Address space handler context 362 * region_context - Region specific context 363 * 364 * RETURN: Status 365 * 366 * DESCRIPTION: Setup a pci_BAR operation region 367 * 368 * MUTEX: Assumes namespace is not locked 369 * 370 ******************************************************************************/ 371 372acpi_status 373acpi_ev_pci_bar_region_setup(acpi_handle handle, 374 u32 function, 375 void *handler_context, void **region_context) 376{ 377 ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup); 378 379 return_ACPI_STATUS(AE_OK); 380} 381 382/******************************************************************************* 383 * 384 * FUNCTION: acpi_ev_cmos_region_setup 385 * 386 * PARAMETERS: handle - Region we are interested in 387 * function - Start or stop 388 * handler_context - Address space handler context 389 * region_context - Region specific context 390 * 391 * RETURN: Status 392 * 393 * DESCRIPTION: Setup a CMOS operation region 394 * 395 * MUTEX: Assumes namespace is not locked 396 * 397 ******************************************************************************/ 398 399acpi_status 400acpi_ev_cmos_region_setup(acpi_handle handle, 401 u32 function, 402 void *handler_context, void **region_context) 403{ 404 ACPI_FUNCTION_TRACE(ev_cmos_region_setup); 405 406 return_ACPI_STATUS(AE_OK); 407} 408 409/******************************************************************************* 410 * 411 * FUNCTION: acpi_ev_default_region_setup 412 * 413 * PARAMETERS: handle - Region we are interested in 414 * function - Start or stop 415 * handler_context - Address space handler context 416 * region_context - Region specific context 417 * 418 * RETURN: Status 419 * 420 * DESCRIPTION: Default region initialization 421 * 422 ******************************************************************************/ 423 424acpi_status 425acpi_ev_default_region_setup(acpi_handle handle, 426 u32 function, 427 void *handler_context, void **region_context) 428{ 429 ACPI_FUNCTION_TRACE(ev_default_region_setup); 430 431 if (function == ACPI_REGION_DEACTIVATE) { 432 *region_context = NULL; 433 } else { 434 *region_context = handler_context; 435 } 436 437 return_ACPI_STATUS(AE_OK); 438} 439 440/******************************************************************************* 441 * 442 * FUNCTION: acpi_ev_initialize_region 443 * 444 * PARAMETERS: region_obj - Region we are initializing 445 * 446 * RETURN: Status 447 * 448 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them 449 * for execution at a later time 450 * 451 * Get the appropriate address space handler for a newly 452 * created region. 453 * 454 * This also performs address space specific initialization. For 455 * example, PCI regions must have an _ADR object that contains 456 * a PCI address in the scope of the definition. This address is 457 * required to perform an access to PCI config space. 458 * 459 * MUTEX: Interpreter should be unlocked, because we may run the _REG 460 * method for this region. 461 * 462 * NOTE: Possible incompliance: 463 * There is a behavior conflict in automatic _REG execution: 464 * 1. When the interpreter is evaluating a method, we can only 465 * automatically run _REG for the following case: 466 * operation_region (OPR1, 0x80, 0x1000010, 0x4) 467 * 2. When the interpreter is loading a table, we can also 468 * automatically run _REG for the following case: 469 * operation_region (OPR1, 0x80, 0x1000010, 0x4) 470 * Though this may not be compliant to the de-facto standard, the 471 * logic is kept in order not to trigger regressions. And keeping 472 * this logic should be taken care by the caller of this function. 473 * 474 ******************************************************************************/ 475 476acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj) 477{ 478 union acpi_operand_object *handler_obj; 479 union acpi_operand_object *obj_desc; 480 acpi_adr_space_type space_id; 481 struct acpi_namespace_node *node; 482 483 ACPI_FUNCTION_TRACE(ev_initialize_region); 484 485 if (!region_obj) { 486 return_ACPI_STATUS(AE_BAD_PARAMETER); 487 } 488 489 if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) { 490 return_ACPI_STATUS(AE_OK); 491 } 492 493 region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED; 494 495 node = region_obj->region.node->parent; 496 space_id = region_obj->region.space_id; 497 498 /* 499 * The following loop depends upon the root Node having no parent 500 * ie: acpi_gbl_root_node->Parent being set to NULL 501 */ 502 while (node) { 503 504 /* Check to see if a handler exists */ 505 506 handler_obj = NULL; 507 obj_desc = acpi_ns_get_attached_object(node); 508 if (obj_desc) { 509 510 /* Can only be a handler if the object exists */ 511 512 switch (node->type) { 513 case ACPI_TYPE_DEVICE: 514 case ACPI_TYPE_PROCESSOR: 515 case ACPI_TYPE_THERMAL: 516 517 handler_obj = obj_desc->common_notify.handler; 518 break; 519 520 default: 521 522 /* Ignore other objects */ 523 524 break; 525 } 526 527 handler_obj = 528 acpi_ev_find_region_handler(space_id, handler_obj); 529 if (handler_obj) { 530 531 /* Found correct handler */ 532 533 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 534 "Found handler %p for region %p in obj %p\n", 535 handler_obj, region_obj, 536 obj_desc)); 537 538 (void)acpi_ev_attach_region(handler_obj, 539 region_obj, FALSE); 540 541 /* 542 * Tell all users that this region is usable by 543 * running the _REG method 544 */ 545 acpi_ex_exit_interpreter(); 546 (void)acpi_ev_execute_reg_method(region_obj, 547 ACPI_REG_CONNECT); 548 acpi_ex_enter_interpreter(); 549 return_ACPI_STATUS(AE_OK); 550 } 551 } 552 553 /* This node does not have the handler we need; Pop up one level */ 554 555 node = node->parent; 556 } 557 558 /* 559 * If we get here, there is no handler for this region. This is not 560 * fatal because many regions get created before a handler is installed 561 * for said region. 562 */ 563 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 564 "No handler for RegionType %s(%X) (RegionObj %p)\n", 565 acpi_ut_get_region_name(space_id), space_id, 566 region_obj)); 567 568 return_ACPI_STATUS(AE_OK); 569} 570