1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: evgpeinit - System GPE initialization and update 5 * 6 * Copyright (C) 2000 - 2023, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acevents.h" 13 #include "acnamesp.h" 14 15 #define _COMPONENT ACPI_EVENTS 16 ACPI_MODULE_NAME("evgpeinit") 17 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 18 /* 19 * Note: History of _PRW support in ACPICA 20 * 21 * Originally (2000 - 2010), the GPE initialization code performed a walk of 22 * the entire namespace to execute the _PRW methods and detect all GPEs 23 * capable of waking the system. 24 * 25 * As of 10/2010, the _PRW method execution has been removed since it is 26 * actually unnecessary. The host OS must in fact execute all _PRW methods 27 * in order to identify the device/power-resource dependencies. We now put 28 * the onus on the host OS to identify the wake GPEs as part of this process 29 * and to inform ACPICA of these GPEs via the acpi_setup_gpe_for_wake interface. This 30 * not only reduces the complexity of the ACPICA initialization code, but in 31 * some cases (on systems with very large namespaces) it should reduce the 32 * kernel boot time as well. 33 */ 34 35 #ifdef ACPI_GPE_USE_LOGICAL_ADDRESSES 36 #define ACPI_FADT_GPE_BLOCK_ADDRESS(N) \ 37 acpi_gbl_FADT.xgpe##N##_block.space_id == \ 38 ACPI_ADR_SPACE_SYSTEM_MEMORY ? \ 39 (u64)acpi_gbl_xgpe##N##_block_logical_address : \ 40 acpi_gbl_FADT.xgpe##N##_block.address 41 #else 42 #define ACPI_FADT_GPE_BLOCK_ADDRESS(N) acpi_gbl_FADT.xgpe##N##_block.address 43 #endif /* ACPI_GPE_USE_LOGICAL_ADDRESSES */ 44 45 /******************************************************************************* 46 * 47 * FUNCTION: acpi_ev_gpe_initialize 48 * 49 * PARAMETERS: None 50 * 51 * RETURN: Status 52 * 53 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks 54 * 55 ******************************************************************************/ 56 acpi_status acpi_ev_gpe_initialize(void) 57 { 58 u32 register_count0 = 0; 59 u32 register_count1 = 0; 60 u32 gpe_number_max = 0; 61 acpi_status status; 62 u64 address; 63 64 ACPI_FUNCTION_TRACE(ev_gpe_initialize); 65 66 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 67 "Initializing General Purpose Events (GPEs):\n")); 68 69 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 70 if (ACPI_FAILURE(status)) { 71 return_ACPI_STATUS(status); 72 } 73 74 /* 75 * Initialize the GPE Block(s) defined in the FADT 76 * 77 * Why the GPE register block lengths are divided by 2: From the ACPI 78 * Spec, section "General-Purpose Event Registers", we have: 79 * 80 * "Each register block contains two registers of equal length 81 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the 82 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN 83 * The length of the GPE1_STS and GPE1_EN registers is equal to 84 * half the GPE1_LEN. If a generic register block is not supported 85 * then its respective block pointer and block length values in the 86 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need 87 * to be the same size." 88 */ 89 90 /* 91 * Determine the maximum GPE number for this machine. 92 * 93 * Note: both GPE0 and GPE1 are optional, and either can exist without 94 * the other. 95 * 96 * If EITHER the register length OR the block address are zero, then that 97 * particular block is not supported. 98 */ 99 address = ACPI_FADT_GPE_BLOCK_ADDRESS(0); 100 101 if (acpi_gbl_FADT.gpe0_block_length && address) { 102 103 /* GPE block 0 exists (has both length and address > 0) */ 104 105 register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2); 106 gpe_number_max = 107 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1; 108 109 /* Install GPE Block 0 */ 110 111 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, 112 address, 113 acpi_gbl_FADT.xgpe0_block. 114 space_id, register_count0, 0, 115 acpi_gbl_FADT.sci_interrupt, 116 &acpi_gbl_gpe_fadt_blocks[0]); 117 118 if (ACPI_FAILURE(status)) { 119 ACPI_EXCEPTION((AE_INFO, status, 120 "Could not create GPE Block 0")); 121 } 122 } 123 124 address = ACPI_FADT_GPE_BLOCK_ADDRESS(1); 125 126 if (acpi_gbl_FADT.gpe1_block_length && address) { 127 128 /* GPE block 1 exists (has both length and address > 0) */ 129 130 register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2); 131 132 /* Check for GPE0/GPE1 overlap (if both banks exist) */ 133 134 if ((register_count0) && 135 (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) { 136 ACPI_ERROR((AE_INFO, 137 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block " 138 "(GPE %u to %u) - Ignoring GPE1", 139 gpe_number_max, acpi_gbl_FADT.gpe1_base, 140 acpi_gbl_FADT.gpe1_base + 141 ((register_count1 * 142 ACPI_GPE_REGISTER_WIDTH) - 1))); 143 144 /* Ignore GPE1 block by setting the register count to zero */ 145 146 register_count1 = 0; 147 } else { 148 /* Install GPE Block 1 */ 149 150 status = 151 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, 152 address, 153 acpi_gbl_FADT.xgpe1_block. 154 space_id, register_count1, 155 acpi_gbl_FADT.gpe1_base, 156 acpi_gbl_FADT. 157 sci_interrupt, 158 &acpi_gbl_gpe_fadt_blocks 159 [1]); 160 161 if (ACPI_FAILURE(status)) { 162 ACPI_EXCEPTION((AE_INFO, status, 163 "Could not create GPE Block 1")); 164 } 165 166 /* 167 * GPE0 and GPE1 do not have to be contiguous in the GPE number 168 * space. However, GPE0 always starts at GPE number zero. 169 */ 170 } 171 } 172 173 /* Exit if there are no GPE registers */ 174 175 if ((register_count0 + register_count1) == 0) { 176 177 /* GPEs are not required by ACPI, this is OK */ 178 179 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 180 "There are no GPE blocks defined in the FADT\n")); 181 goto cleanup; 182 } 183 184 cleanup: 185 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 186 return_ACPI_STATUS(AE_OK); 187 } 188 189 /******************************************************************************* 190 * 191 * FUNCTION: acpi_ev_update_gpes 192 * 193 * PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table 194 * 195 * RETURN: None 196 * 197 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a 198 * result of a Load() or load_table() operation. If new GPE 199 * methods have been installed, register the new methods. 200 * 201 ******************************************************************************/ 202 203 void acpi_ev_update_gpes(acpi_owner_id table_owner_id) 204 { 205 struct acpi_gpe_xrupt_info *gpe_xrupt_info; 206 struct acpi_gpe_block_info *gpe_block; 207 struct acpi_gpe_walk_info walk_info; 208 acpi_status status = AE_OK; 209 210 /* 211 * Find any _Lxx/_Exx GPE methods that have just been loaded. 212 * 213 * Any GPEs that correspond to new _Lxx/_Exx methods are immediately 214 * enabled. 215 * 216 * Examine the namespace underneath each gpe_device within the 217 * gpe_block lists. 218 */ 219 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 220 if (ACPI_FAILURE(status)) { 221 return; 222 } 223 224 walk_info.count = 0; 225 walk_info.owner_id = table_owner_id; 226 walk_info.execute_by_owner_id = TRUE; 227 228 /* Walk the interrupt level descriptor list */ 229 230 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head; 231 while (gpe_xrupt_info) { 232 233 /* Walk all Gpe Blocks attached to this interrupt level */ 234 235 gpe_block = gpe_xrupt_info->gpe_block_list_head; 236 while (gpe_block) { 237 walk_info.gpe_block = gpe_block; 238 walk_info.gpe_device = gpe_block->node; 239 240 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, 241 walk_info.gpe_device, 242 ACPI_UINT32_MAX, 243 ACPI_NS_WALK_NO_UNLOCK, 244 acpi_ev_match_gpe_method, 245 NULL, &walk_info, NULL); 246 if (ACPI_FAILURE(status)) { 247 ACPI_EXCEPTION((AE_INFO, status, 248 "While decoding _Lxx/_Exx methods")); 249 } 250 251 gpe_block = gpe_block->next; 252 } 253 254 gpe_xrupt_info = gpe_xrupt_info->next; 255 } 256 257 if (walk_info.count) { 258 ACPI_INFO(("Enabled %u new GPEs", walk_info.count)); 259 } 260 261 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); 262 return; 263 } 264 265 /******************************************************************************* 266 * 267 * FUNCTION: acpi_ev_match_gpe_method 268 * 269 * PARAMETERS: Callback from walk_namespace 270 * 271 * RETURN: Status 272 * 273 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a 274 * control method under the _GPE portion of the namespace. 275 * Extract the name and GPE type from the object, saving this 276 * information for quick lookup during GPE dispatch. Allows a 277 * per-owner_id evaluation if execute_by_owner_id is TRUE in the 278 * walk_info parameter block. 279 * 280 * The name of each GPE control method is of the form: 281 * "_Lxx" or "_Exx", where: 282 * L - means that the GPE is level triggered 283 * E - means that the GPE is edge triggered 284 * xx - is the GPE number [in HEX] 285 * 286 * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods 287 * with that owner. 288 * 289 ******************************************************************************/ 290 291 acpi_status 292 acpi_ev_match_gpe_method(acpi_handle obj_handle, 293 u32 level, void *context, void **return_value) 294 { 295 struct acpi_namespace_node *method_node = 296 ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); 297 struct acpi_gpe_walk_info *walk_info = 298 ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); 299 struct acpi_gpe_event_info *gpe_event_info; 300 acpi_status status; 301 u32 gpe_number; 302 u8 temp_gpe_number; 303 char name[ACPI_NAMESEG_SIZE + 1]; 304 u8 type; 305 306 ACPI_FUNCTION_TRACE(ev_match_gpe_method); 307 308 /* Check if requested owner_id matches this owner_id */ 309 310 if ((walk_info->execute_by_owner_id) && 311 (method_node->owner_id != walk_info->owner_id)) { 312 return_ACPI_STATUS(AE_OK); 313 } 314 315 /* 316 * Match and decode the _Lxx and _Exx GPE method names 317 * 318 * 1) Extract the method name and null terminate it 319 */ 320 ACPI_MOVE_32_TO_32(name, &method_node->name.integer); 321 name[ACPI_NAMESEG_SIZE] = 0; 322 323 /* 2) Name must begin with an underscore */ 324 325 if (name[0] != '_') { 326 return_ACPI_STATUS(AE_OK); /* Ignore this method */ 327 } 328 329 /* 330 * 3) Edge/Level determination is based on the 2nd character 331 * of the method name 332 */ 333 switch (name[1]) { 334 case 'L': 335 336 type = ACPI_GPE_LEVEL_TRIGGERED; 337 break; 338 339 case 'E': 340 341 type = ACPI_GPE_EDGE_TRIGGERED; 342 break; 343 344 default: 345 346 /* Unknown method type, just ignore it */ 347 348 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 349 "Ignoring unknown GPE method type: %s " 350 "(name not of form _Lxx or _Exx)", name)); 351 return_ACPI_STATUS(AE_OK); 352 } 353 354 /* 4) The last two characters of the name are the hex GPE Number */ 355 356 status = acpi_ut_ascii_to_hex_byte(&name[2], &temp_gpe_number); 357 if (ACPI_FAILURE(status)) { 358 359 /* Conversion failed; invalid method, just ignore it */ 360 361 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 362 "Could not extract GPE number from name: %s " 363 "(name is not of form _Lxx or _Exx)", name)); 364 return_ACPI_STATUS(AE_OK); 365 } 366 367 /* Ensure that we have a valid GPE number for this GPE block */ 368 369 gpe_number = (u32)temp_gpe_number; 370 gpe_event_info = 371 acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block); 372 if (!gpe_event_info) { 373 /* 374 * This gpe_number is not valid for this GPE block, just ignore it. 375 * However, it may be valid for a different GPE block, since GPE0 376 * and GPE1 methods both appear under \_GPE. 377 */ 378 return_ACPI_STATUS(AE_OK); 379 } 380 381 if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == 382 ACPI_GPE_DISPATCH_HANDLER) || 383 (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == 384 ACPI_GPE_DISPATCH_RAW_HANDLER)) { 385 386 /* If there is already a handler, ignore this GPE method */ 387 388 return_ACPI_STATUS(AE_OK); 389 } 390 391 if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == 392 ACPI_GPE_DISPATCH_METHOD) { 393 /* 394 * If there is already a method, ignore this method. But check 395 * for a type mismatch (if both the _Lxx AND _Exx exist) 396 */ 397 if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) { 398 ACPI_ERROR((AE_INFO, 399 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods", 400 gpe_number, gpe_number, gpe_number)); 401 } 402 return_ACPI_STATUS(AE_OK); 403 } 404 405 /* Disable the GPE in case it's been enabled already. */ 406 407 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); 408 409 /* 410 * Add the GPE information from above to the gpe_event_info block for 411 * use during dispatch of this GPE. 412 */ 413 gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK); 414 gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD); 415 gpe_event_info->dispatch.method_node = method_node; 416 417 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 418 "Registered GPE method %s as GPE number 0x%.2X\n", 419 name, gpe_number)); 420 return_ACPI_STATUS(AE_OK); 421 } 422 423 #endif /* !ACPI_REDUCED_HARDWARE */ 424