1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: evgpeblk - GPE block creation and initialization. 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 15 #define _COMPONENT ACPI_EVENTS 16 ACPI_MODULE_NAME("evgpeblk") 17 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 18 /* Local prototypes */ 19 static acpi_status 20 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block, 21 u32 interrupt_number); 22 23 static acpi_status 24 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block); 25 26 /******************************************************************************* 27 * 28 * FUNCTION: acpi_ev_install_gpe_block 29 * 30 * PARAMETERS: gpe_block - New GPE block 31 * interrupt_number - Xrupt to be associated with this 32 * GPE block 33 * 34 * RETURN: Status 35 * 36 * DESCRIPTION: Install new GPE block with mutex support 37 * 38 ******************************************************************************/ 39 40 static acpi_status 41 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block, 42 u32 interrupt_number) 43 { 44 struct acpi_gpe_block_info *next_gpe_block; 45 struct acpi_gpe_xrupt_info *gpe_xrupt_block; 46 acpi_status status; 47 acpi_cpu_flags flags; 48 49 ACPI_FUNCTION_TRACE(ev_install_gpe_block); 50 51 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 52 if (ACPI_FAILURE(status)) { 53 return_ACPI_STATUS(status); 54 } 55 56 status = 57 acpi_ev_get_gpe_xrupt_block(interrupt_number, &gpe_xrupt_block); 58 if (ACPI_FAILURE(status)) { 59 goto unlock_and_exit; 60 } 61 62 /* Install the new block at the end of the list with lock */ 63 64 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 65 if (gpe_xrupt_block->gpe_block_list_head) { 66 next_gpe_block = gpe_xrupt_block->gpe_block_list_head; 67 while (next_gpe_block->next) { 68 next_gpe_block = next_gpe_block->next; 69 } 70 71 next_gpe_block->next = gpe_block; 72 gpe_block->previous = next_gpe_block; 73 } else { 74 gpe_xrupt_block->gpe_block_list_head = gpe_block; 75 } 76 77 gpe_block->xrupt_block = gpe_xrupt_block; 78 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 79 80 unlock_and_exit: 81 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); 82 return_ACPI_STATUS(status); 83 } 84 85 /******************************************************************************* 86 * 87 * FUNCTION: acpi_ev_delete_gpe_block 88 * 89 * PARAMETERS: gpe_block - Existing GPE block 90 * 91 * RETURN: Status 92 * 93 * DESCRIPTION: Remove a GPE block 94 * 95 ******************************************************************************/ 96 97 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block) 98 { 99 acpi_status status; 100 acpi_cpu_flags flags; 101 102 ACPI_FUNCTION_TRACE(ev_install_gpe_block); 103 104 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 105 if (ACPI_FAILURE(status)) { 106 return_ACPI_STATUS(status); 107 } 108 109 /* Disable all GPEs in this block */ 110 111 status = 112 acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL); 113 114 if (!gpe_block->previous && !gpe_block->next) { 115 116 /* This is the last gpe_block on this interrupt */ 117 118 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block); 119 if (ACPI_FAILURE(status)) { 120 goto unlock_and_exit; 121 } 122 } else { 123 /* Remove the block on this interrupt with lock */ 124 125 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 126 if (gpe_block->previous) { 127 gpe_block->previous->next = gpe_block->next; 128 } else { 129 gpe_block->xrupt_block->gpe_block_list_head = 130 gpe_block->next; 131 } 132 133 if (gpe_block->next) { 134 gpe_block->next->previous = gpe_block->previous; 135 } 136 137 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 138 } 139 140 acpi_current_gpe_count -= gpe_block->gpe_count; 141 142 /* Free the gpe_block */ 143 144 ACPI_FREE(gpe_block->register_info); 145 ACPI_FREE(gpe_block->event_info); 146 ACPI_FREE(gpe_block); 147 148 unlock_and_exit: 149 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS); 150 return_ACPI_STATUS(status); 151 } 152 153 /******************************************************************************* 154 * 155 * FUNCTION: acpi_ev_create_gpe_info_blocks 156 * 157 * PARAMETERS: gpe_block - New GPE block 158 * 159 * RETURN: Status 160 * 161 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block 162 * 163 ******************************************************************************/ 164 165 static acpi_status 166 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block) 167 { 168 struct acpi_gpe_register_info *gpe_register_info = NULL; 169 struct acpi_gpe_event_info *gpe_event_info = NULL; 170 struct acpi_gpe_event_info *this_event; 171 struct acpi_gpe_register_info *this_register; 172 u32 i; 173 u32 j; 174 acpi_status status; 175 176 ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks); 177 178 /* Allocate the GPE register information block */ 179 180 gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block-> 181 register_count * 182 sizeof(struct 183 acpi_gpe_register_info)); 184 if (!gpe_register_info) { 185 ACPI_ERROR((AE_INFO, 186 "Could not allocate the GpeRegisterInfo table")); 187 return_ACPI_STATUS(AE_NO_MEMORY); 188 } 189 190 /* 191 * Allocate the GPE event_info block. There are eight distinct GPEs 192 * per register. Initialization to zeros is sufficient. 193 */ 194 gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size)gpe_block->gpe_count * 195 sizeof(struct 196 acpi_gpe_event_info)); 197 if (!gpe_event_info) { 198 ACPI_ERROR((AE_INFO, 199 "Could not allocate the GpeEventInfo table")); 200 status = AE_NO_MEMORY; 201 goto error_exit; 202 } 203 204 /* Save the new Info arrays in the GPE block */ 205 206 gpe_block->register_info = gpe_register_info; 207 gpe_block->event_info = gpe_event_info; 208 209 /* 210 * Initialize the GPE Register and Event structures. A goal of these 211 * tables is to hide the fact that there are two separate GPE register 212 * sets in a given GPE hardware block, the status registers occupy the 213 * first half, and the enable registers occupy the second half. 214 */ 215 this_register = gpe_register_info; 216 this_event = gpe_event_info; 217 218 for (i = 0; i < gpe_block->register_count; i++) { 219 220 /* Init the register_info for this GPE register (8 GPEs) */ 221 222 this_register->base_gpe_number = (u16) 223 (gpe_block->block_base_number + 224 (i * ACPI_GPE_REGISTER_WIDTH)); 225 226 this_register->status_address.address = gpe_block->address + i; 227 228 this_register->enable_address.address = 229 gpe_block->address + i + gpe_block->register_count; 230 231 this_register->status_address.space_id = gpe_block->space_id; 232 this_register->enable_address.space_id = gpe_block->space_id; 233 this_register->status_address.bit_width = 234 ACPI_GPE_REGISTER_WIDTH; 235 this_register->enable_address.bit_width = 236 ACPI_GPE_REGISTER_WIDTH; 237 this_register->status_address.bit_offset = 0; 238 this_register->enable_address.bit_offset = 0; 239 240 /* Init the event_info for each GPE within this register */ 241 242 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 243 this_event->gpe_number = 244 (u8) (this_register->base_gpe_number + j); 245 this_event->register_info = this_register; 246 this_event++; 247 } 248 249 /* Disable all GPEs within this register */ 250 251 status = acpi_hw_write(0x00, &this_register->enable_address); 252 if (ACPI_FAILURE(status)) { 253 goto error_exit; 254 } 255 256 /* Clear any pending GPE events within this register */ 257 258 status = acpi_hw_write(0xFF, &this_register->status_address); 259 if (ACPI_FAILURE(status)) { 260 goto error_exit; 261 } 262 263 this_register++; 264 } 265 266 return_ACPI_STATUS(AE_OK); 267 268 error_exit: 269 if (gpe_register_info) { 270 ACPI_FREE(gpe_register_info); 271 } 272 if (gpe_event_info) { 273 ACPI_FREE(gpe_event_info); 274 } 275 276 return_ACPI_STATUS(status); 277 } 278 279 /******************************************************************************* 280 * 281 * FUNCTION: acpi_ev_create_gpe_block 282 * 283 * PARAMETERS: gpe_device - Handle to the parent GPE block 284 * gpe_block_address - Address and space_ID 285 * register_count - Number of GPE register pairs in the block 286 * gpe_block_base_number - Starting GPE number for the block 287 * interrupt_number - H/W interrupt for the block 288 * return_gpe_block - Where the new block descriptor is returned 289 * 290 * RETURN: Status 291 * 292 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within 293 * the block are disabled at exit. 294 * Note: Assumes namespace is locked. 295 * 296 ******************************************************************************/ 297 298 acpi_status 299 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device, 300 u64 address, 301 u8 space_id, 302 u32 register_count, 303 u16 gpe_block_base_number, 304 u32 interrupt_number, 305 struct acpi_gpe_block_info **return_gpe_block) 306 { 307 acpi_status status; 308 struct acpi_gpe_block_info *gpe_block; 309 struct acpi_gpe_walk_info walk_info; 310 311 ACPI_FUNCTION_TRACE(ev_create_gpe_block); 312 313 if (!register_count) { 314 return_ACPI_STATUS(AE_OK); 315 } 316 317 /* Allocate a new GPE block */ 318 319 gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info)); 320 if (!gpe_block) { 321 return_ACPI_STATUS(AE_NO_MEMORY); 322 } 323 324 /* Initialize the new GPE block */ 325 326 gpe_block->address = address; 327 gpe_block->space_id = space_id; 328 gpe_block->node = gpe_device; 329 gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH); 330 gpe_block->initialized = FALSE; 331 gpe_block->register_count = register_count; 332 gpe_block->block_base_number = gpe_block_base_number; 333 334 /* 335 * Create the register_info and event_info sub-structures 336 * Note: disables and clears all GPEs in the block 337 */ 338 status = acpi_ev_create_gpe_info_blocks(gpe_block); 339 if (ACPI_FAILURE(status)) { 340 ACPI_FREE(gpe_block); 341 return_ACPI_STATUS(status); 342 } 343 344 /* Install the new block in the global lists */ 345 346 status = acpi_ev_install_gpe_block(gpe_block, interrupt_number); 347 if (ACPI_FAILURE(status)) { 348 ACPI_FREE(gpe_block->register_info); 349 ACPI_FREE(gpe_block->event_info); 350 ACPI_FREE(gpe_block); 351 return_ACPI_STATUS(status); 352 } 353 354 acpi_gbl_all_gpes_initialized = FALSE; 355 356 /* Find all GPE methods (_Lxx or_Exx) for this block */ 357 358 walk_info.gpe_block = gpe_block; 359 walk_info.gpe_device = gpe_device; 360 walk_info.execute_by_owner_id = FALSE; 361 362 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device, 363 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, 364 acpi_ev_match_gpe_method, NULL, 365 &walk_info, NULL); 366 367 /* Return the new block */ 368 369 if (return_gpe_block) { 370 (*return_gpe_block) = gpe_block; 371 } 372 373 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 374 " Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X%s\n", 375 (u32)gpe_block->block_base_number, 376 (u32)(gpe_block->block_base_number + 377 (gpe_block->gpe_count - 1)), 378 gpe_device->name.ascii, gpe_block->register_count, 379 interrupt_number, 380 interrupt_number == 381 acpi_gbl_FADT.sci_interrupt ? " (SCI)" : "")); 382 383 /* Update global count of currently available GPEs */ 384 385 acpi_current_gpe_count += gpe_block->gpe_count; 386 return_ACPI_STATUS(AE_OK); 387 } 388 389 /******************************************************************************* 390 * 391 * FUNCTION: acpi_ev_initialize_gpe_block 392 * 393 * PARAMETERS: acpi_gpe_callback 394 * 395 * RETURN: Status 396 * 397 * DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have 398 * associated methods. 399 * Note: Assumes namespace is locked. 400 * 401 ******************************************************************************/ 402 403 acpi_status 404 acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, 405 struct acpi_gpe_block_info *gpe_block, 406 void *context) 407 { 408 acpi_status status; 409 struct acpi_gpe_event_info *gpe_event_info; 410 u32 gpe_enabled_count; 411 u32 gpe_index; 412 u32 i; 413 u32 j; 414 u8 *is_polling_needed = context; 415 ACPI_ERROR_ONLY(u32 gpe_number); 416 417 ACPI_FUNCTION_TRACE(ev_initialize_gpe_block); 418 419 /* 420 * Ignore a null GPE block (e.g., if no GPE block 1 exists), and 421 * any GPE blocks that have been initialized already. 422 */ 423 if (!gpe_block || gpe_block->initialized) { 424 return_ACPI_STATUS(AE_OK); 425 } 426 427 /* 428 * Enable all GPEs that have a corresponding method and have the 429 * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block 430 * must be enabled via the acpi_enable_gpe() interface. 431 */ 432 gpe_enabled_count = 0; 433 434 for (i = 0; i < gpe_block->register_count; i++) { 435 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 436 437 /* Get the info block for this particular GPE */ 438 439 gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j; 440 gpe_event_info = &gpe_block->event_info[gpe_index]; 441 ACPI_ERROR_ONLY(gpe_number = 442 gpe_block->block_base_number + 443 gpe_index); 444 gpe_event_info->flags |= ACPI_GPE_INITIALIZED; 445 446 /* 447 * Ignore GPEs that have no corresponding _Lxx/_Exx method 448 * and GPEs that are used for wakeup 449 */ 450 if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) != 451 ACPI_GPE_DISPATCH_METHOD) 452 || (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) { 453 continue; 454 } 455 456 status = acpi_ev_add_gpe_reference(gpe_event_info, FALSE); 457 if (ACPI_FAILURE(status)) { 458 ACPI_EXCEPTION((AE_INFO, status, 459 "Could not enable GPE 0x%02X", 460 gpe_number)); 461 continue; 462 } 463 464 gpe_event_info->flags |= ACPI_GPE_AUTO_ENABLED; 465 466 if (is_polling_needed && 467 ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) { 468 *is_polling_needed = TRUE; 469 } 470 471 gpe_enabled_count++; 472 } 473 } 474 475 if (gpe_enabled_count) { 476 ACPI_INFO(("Enabled %u GPEs in block %02X to %02X", 477 gpe_enabled_count, (u32)gpe_block->block_base_number, 478 (u32)(gpe_block->block_base_number + 479 (gpe_block->gpe_count - 1)))); 480 } 481 482 gpe_block->initialized = TRUE; 483 484 return_ACPI_STATUS(AE_OK); 485 } 486 487 #endif /* !ACPI_REDUCED_HARDWARE */ 488