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 - 2019, 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 17 ACPI_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 ******************************************************************************/ 33 acpi_status 34 acpi_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 42 ACPI_FUNCTION_TRACE(ev_system_memory_region_setup); 43 44 if (function == ACPI_REGION_DEACTIVATE) { 45 if (*region_context) { 46 local_region_context = 47 (struct acpi_mem_space_context *)*region_context; 48 49 /* Delete a cached mapping if present */ 50 51 if (local_region_context->mapped_length) { 52 acpi_os_unmap_memory(local_region_context-> 53 mapped_logical_address, 54 local_region_context-> 55 mapped_length); 56 } 57 ACPI_FREE(local_region_context); 58 *region_context = NULL; 59 } 60 return_ACPI_STATUS(AE_OK); 61 } 62 63 /* Create a new context */ 64 65 local_region_context = 66 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context)); 67 if (!(local_region_context)) { 68 return_ACPI_STATUS(AE_NO_MEMORY); 69 } 70 71 /* Save the region length and address for use in the handler */ 72 73 local_region_context->length = region_desc->region.length; 74 local_region_context->address = region_desc->region.address; 75 76 *region_context = local_region_context; 77 return_ACPI_STATUS(AE_OK); 78 } 79 80 /******************************************************************************* 81 * 82 * FUNCTION: acpi_ev_io_space_region_setup 83 * 84 * PARAMETERS: handle - Region we are interested in 85 * function - Start or stop 86 * handler_context - Address space handler context 87 * region_context - Region specific context 88 * 89 * RETURN: Status 90 * 91 * DESCRIPTION: Setup a IO operation region 92 * 93 ******************************************************************************/ 94 95 acpi_status 96 acpi_ev_io_space_region_setup(acpi_handle handle, 97 u32 function, 98 void *handler_context, void **region_context) 99 { 100 ACPI_FUNCTION_TRACE(ev_io_space_region_setup); 101 102 if (function == ACPI_REGION_DEACTIVATE) { 103 *region_context = NULL; 104 } else { 105 *region_context = handler_context; 106 } 107 108 return_ACPI_STATUS(AE_OK); 109 } 110 111 /******************************************************************************* 112 * 113 * FUNCTION: acpi_ev_pci_config_region_setup 114 * 115 * PARAMETERS: handle - Region we are interested in 116 * function - Start or stop 117 * handler_context - Address space handler context 118 * region_context - Region specific context 119 * 120 * RETURN: Status 121 * 122 * DESCRIPTION: Setup a PCI_Config operation region 123 * 124 * MUTEX: Assumes namespace is not locked 125 * 126 ******************************************************************************/ 127 128 acpi_status 129 acpi_ev_pci_config_region_setup(acpi_handle handle, 130 u32 function, 131 void *handler_context, void **region_context) 132 { 133 acpi_status status = AE_OK; 134 u64 pci_value; 135 struct acpi_pci_id *pci_id = *region_context; 136 union acpi_operand_object *handler_obj; 137 struct acpi_namespace_node *parent_node; 138 struct acpi_namespace_node *pci_root_node; 139 struct acpi_namespace_node *pci_device_node; 140 union acpi_operand_object *region_obj = 141 (union acpi_operand_object *)handle; 142 143 ACPI_FUNCTION_TRACE(ev_pci_config_region_setup); 144 145 handler_obj = region_obj->region.handler; 146 if (!handler_obj) { 147 /* 148 * No installed handler. This shouldn't happen because the dispatch 149 * routine checks before we get here, but we check again just in case. 150 */ 151 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 152 "Attempting to init a region %p, with no handler\n", 153 region_obj)); 154 return_ACPI_STATUS(AE_NOT_EXIST); 155 } 156 157 *region_context = NULL; 158 if (function == ACPI_REGION_DEACTIVATE) { 159 if (pci_id) { 160 ACPI_FREE(pci_id); 161 } 162 return_ACPI_STATUS(status); 163 } 164 165 parent_node = region_obj->region.node->parent; 166 167 /* 168 * Get the _SEG and _BBN values from the device upon which the handler 169 * is installed. 170 * 171 * We need to get the _SEG and _BBN objects relative to the PCI BUS device. 172 * This is the device the handler has been registered to handle. 173 */ 174 175 /* 176 * If the address_space.Node is still pointing to the root, we need 177 * to scan upward for a PCI Root bridge and re-associate the op_region 178 * handlers with that device. 179 */ 180 if (handler_obj->address_space.node == acpi_gbl_root_node) { 181 182 /* Start search from the parent object */ 183 184 pci_root_node = parent_node; 185 while (pci_root_node != acpi_gbl_root_node) { 186 187 /* Get the _HID/_CID in order to detect a root_bridge */ 188 189 if (acpi_ev_is_pci_root_bridge(pci_root_node)) { 190 191 /* Install a handler for this PCI root bridge */ 192 193 status = acpi_install_address_space_handler((acpi_handle)pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL); 194 if (ACPI_FAILURE(status)) { 195 if (status == AE_SAME_HANDLER) { 196 /* 197 * It is OK if the handler is already installed on the 198 * root bridge. Still need to return a context object 199 * for the new PCI_Config operation region, however. 200 */ 201 status = AE_OK; 202 } else { 203 ACPI_EXCEPTION((AE_INFO, status, 204 "Could not install PciConfig handler " 205 "for Root Bridge %4.4s", 206 acpi_ut_get_node_name 207 (pci_root_node))); 208 } 209 } 210 break; 211 } 212 213 pci_root_node = pci_root_node->parent; 214 } 215 216 /* PCI root bridge not found, use namespace root node */ 217 } else { 218 pci_root_node = handler_obj->address_space.node; 219 } 220 221 /* 222 * If this region is now initialized, we are done. 223 * (install_address_space_handler could have initialized it) 224 */ 225 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 226 return_ACPI_STATUS(AE_OK); 227 } 228 229 /* Region is still not initialized. Create a new context */ 230 231 pci_id = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pci_id)); 232 if (!pci_id) { 233 return_ACPI_STATUS(AE_NO_MEMORY); 234 } 235 236 /* 237 * For PCI_Config space access, we need the segment, bus, device and 238 * function numbers. Acquire them here. 239 * 240 * Find the parent device object. (This allows the operation region to be 241 * within a subscope under the device, such as a control method.) 242 */ 243 pci_device_node = region_obj->region.node; 244 while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) { 245 pci_device_node = pci_device_node->parent; 246 } 247 248 if (!pci_device_node) { 249 ACPI_FREE(pci_id); 250 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 251 } 252 253 /* 254 * Get the PCI device and function numbers from the _ADR object 255 * contained in the parent's scope. 256 */ 257 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, 258 pci_device_node, &pci_value); 259 260 /* 261 * The default is zero, and since the allocation above zeroed the data, 262 * just do nothing on failure. 263 */ 264 if (ACPI_SUCCESS(status)) { 265 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value)); 266 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value)); 267 } 268 269 /* The PCI segment number comes from the _SEG method */ 270 271 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG, 272 pci_root_node, &pci_value); 273 if (ACPI_SUCCESS(status)) { 274 pci_id->segment = ACPI_LOWORD(pci_value); 275 } 276 277 /* The PCI bus number comes from the _BBN method */ 278 279 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN, 280 pci_root_node, &pci_value); 281 if (ACPI_SUCCESS(status)) { 282 pci_id->bus = ACPI_LOWORD(pci_value); 283 } 284 285 /* Complete/update the PCI ID for this device */ 286 287 status = 288 acpi_hw_derive_pci_id(pci_id, pci_root_node, 289 region_obj->region.node); 290 if (ACPI_FAILURE(status)) { 291 ACPI_FREE(pci_id); 292 return_ACPI_STATUS(status); 293 } 294 295 *region_context = pci_id; 296 return_ACPI_STATUS(AE_OK); 297 } 298 299 /******************************************************************************* 300 * 301 * FUNCTION: acpi_ev_is_pci_root_bridge 302 * 303 * PARAMETERS: node - Device node being examined 304 * 305 * RETURN: TRUE if device is a PCI/PCI-Express Root Bridge 306 * 307 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by 308 * examining the _HID and _CID for the device. 309 * 310 ******************************************************************************/ 311 312 u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node) 313 { 314 acpi_status status; 315 struct acpi_pnp_device_id *hid; 316 struct acpi_pnp_device_id_list *cid; 317 u32 i; 318 u8 match; 319 320 /* Get the _HID and check for a PCI Root Bridge */ 321 322 status = acpi_ut_execute_HID(node, &hid); 323 if (ACPI_FAILURE(status)) { 324 return (FALSE); 325 } 326 327 match = acpi_ut_is_pci_root_bridge(hid->string); 328 ACPI_FREE(hid); 329 330 if (match) { 331 return (TRUE); 332 } 333 334 /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */ 335 336 status = acpi_ut_execute_CID(node, &cid); 337 if (ACPI_FAILURE(status)) { 338 return (FALSE); 339 } 340 341 /* Check all _CIDs in the returned list */ 342 343 for (i = 0; i < cid->count; i++) { 344 if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) { 345 ACPI_FREE(cid); 346 return (TRUE); 347 } 348 } 349 350 ACPI_FREE(cid); 351 return (FALSE); 352 } 353 354 /******************************************************************************* 355 * 356 * FUNCTION: acpi_ev_pci_bar_region_setup 357 * 358 * PARAMETERS: handle - Region we are interested in 359 * function - Start or stop 360 * handler_context - Address space handler context 361 * region_context - Region specific context 362 * 363 * RETURN: Status 364 * 365 * DESCRIPTION: Setup a pci_BAR operation region 366 * 367 * MUTEX: Assumes namespace is not locked 368 * 369 ******************************************************************************/ 370 371 acpi_status 372 acpi_ev_pci_bar_region_setup(acpi_handle handle, 373 u32 function, 374 void *handler_context, void **region_context) 375 { 376 ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup); 377 378 return_ACPI_STATUS(AE_OK); 379 } 380 381 /******************************************************************************* 382 * 383 * FUNCTION: acpi_ev_cmos_region_setup 384 * 385 * PARAMETERS: handle - Region we are interested in 386 * function - Start or stop 387 * handler_context - Address space handler context 388 * region_context - Region specific context 389 * 390 * RETURN: Status 391 * 392 * DESCRIPTION: Setup a CMOS operation region 393 * 394 * MUTEX: Assumes namespace is not locked 395 * 396 ******************************************************************************/ 397 398 acpi_status 399 acpi_ev_cmos_region_setup(acpi_handle handle, 400 u32 function, 401 void *handler_context, void **region_context) 402 { 403 ACPI_FUNCTION_TRACE(ev_cmos_region_setup); 404 405 return_ACPI_STATUS(AE_OK); 406 } 407 408 /******************************************************************************* 409 * 410 * FUNCTION: acpi_ev_default_region_setup 411 * 412 * PARAMETERS: handle - Region we are interested in 413 * function - Start or stop 414 * handler_context - Address space handler context 415 * region_context - Region specific context 416 * 417 * RETURN: Status 418 * 419 * DESCRIPTION: Default region initialization 420 * 421 ******************************************************************************/ 422 423 acpi_status 424 acpi_ev_default_region_setup(acpi_handle handle, 425 u32 function, 426 void *handler_context, void **region_context) 427 { 428 ACPI_FUNCTION_TRACE(ev_default_region_setup); 429 430 if (function == ACPI_REGION_DEACTIVATE) { 431 *region_context = NULL; 432 } else { 433 *region_context = handler_context; 434 } 435 436 return_ACPI_STATUS(AE_OK); 437 } 438 439 /******************************************************************************* 440 * 441 * FUNCTION: acpi_ev_initialize_region 442 * 443 * PARAMETERS: region_obj - Region we are initializing 444 * 445 * RETURN: Status 446 * 447 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them 448 * for execution at a later time 449 * 450 * Get the appropriate address space handler for a newly 451 * created region. 452 * 453 * This also performs address space specific initialization. For 454 * example, PCI regions must have an _ADR object that contains 455 * a PCI address in the scope of the definition. This address is 456 * required to perform an access to PCI config space. 457 * 458 * MUTEX: Interpreter should be unlocked, because we may run the _REG 459 * method for this region. 460 * 461 * NOTE: Possible incompliance: 462 * There is a behavior conflict in automatic _REG execution: 463 * 1. When the interpreter is evaluating a method, we can only 464 * automatically run _REG for the following case: 465 * operation_region (OPR1, 0x80, 0x1000010, 0x4) 466 * 2. When the interpreter is loading a table, we can also 467 * automatically run _REG for the following case: 468 * operation_region (OPR1, 0x80, 0x1000010, 0x4) 469 * Though this may not be compliant to the de-facto standard, the 470 * logic is kept in order not to trigger regressions. And keeping 471 * this logic should be taken care by the caller of this function. 472 * 473 ******************************************************************************/ 474 475 acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj) 476 { 477 union acpi_operand_object *handler_obj; 478 union acpi_operand_object *obj_desc; 479 acpi_adr_space_type space_id; 480 struct acpi_namespace_node *node; 481 482 ACPI_FUNCTION_TRACE(ev_initialize_region); 483 484 if (!region_obj) { 485 return_ACPI_STATUS(AE_BAD_PARAMETER); 486 } 487 488 if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) { 489 return_ACPI_STATUS(AE_OK); 490 } 491 492 region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED; 493 494 node = region_obj->region.node->parent; 495 space_id = region_obj->region.space_id; 496 497 /* 498 * The following loop depends upon the root Node having no parent 499 * ie: acpi_gbl_root_node->Parent being set to NULL 500 */ 501 while (node) { 502 503 /* Check to see if a handler exists */ 504 505 handler_obj = NULL; 506 obj_desc = acpi_ns_get_attached_object(node); 507 if (obj_desc) { 508 509 /* Can only be a handler if the object exists */ 510 511 switch (node->type) { 512 case ACPI_TYPE_DEVICE: 513 case ACPI_TYPE_PROCESSOR: 514 case ACPI_TYPE_THERMAL: 515 516 handler_obj = obj_desc->common_notify.handler; 517 break; 518 519 default: 520 521 /* Ignore other objects */ 522 523 break; 524 } 525 526 handler_obj = 527 acpi_ev_find_region_handler(space_id, handler_obj); 528 if (handler_obj) { 529 530 /* Found correct handler */ 531 532 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 533 "Found handler %p for region %p in obj %p\n", 534 handler_obj, region_obj, 535 obj_desc)); 536 537 (void)acpi_ev_attach_region(handler_obj, 538 region_obj, FALSE); 539 540 /* 541 * Tell all users that this region is usable by 542 * running the _REG method 543 */ 544 acpi_ex_exit_interpreter(); 545 (void)acpi_ev_execute_reg_method(region_obj, 546 ACPI_REG_CONNECT); 547 acpi_ex_enter_interpreter(); 548 return_ACPI_STATUS(AE_OK); 549 } 550 } 551 552 /* This node does not have the handler we need; Pop up one level */ 553 554 node = node->parent; 555 } 556 557 /* 558 * If we get here, there is no handler for this region. This is not 559 * fatal because many regions get created before a handler is installed 560 * for said region. 561 */ 562 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 563 "No handler for RegionType %s(%X) (RegionObj %p)\n", 564 acpi_ut_get_region_name(space_id), space_id, 565 region_obj)); 566 567 return_ACPI_STATUS(AE_OK); 568 } 569