1 /****************************************************************************** 2 * 3 * Module Name: evgpe - General Purpose Event handling and dispatch 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2014, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <acpi/acpi.h> 45 #include "accommon.h" 46 #include "acevents.h" 47 #include "acnamesp.h" 48 49 #define _COMPONENT ACPI_EVENTS 50 ACPI_MODULE_NAME("evgpe") 51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 52 /* Local prototypes */ 53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context); 54 55 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context); 56 57 /******************************************************************************* 58 * 59 * FUNCTION: acpi_ev_update_gpe_enable_mask 60 * 61 * PARAMETERS: gpe_event_info - GPE to update 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Updates GPE register enable mask based upon whether there are 66 * runtime references to this GPE 67 * 68 ******************************************************************************/ 69 70 acpi_status 71 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info) 72 { 73 struct acpi_gpe_register_info *gpe_register_info; 74 u32 register_bit; 75 76 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask); 77 78 gpe_register_info = gpe_event_info->register_info; 79 if (!gpe_register_info) { 80 return_ACPI_STATUS(AE_NOT_EXIST); 81 } 82 83 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); 84 85 /* Clear the run bit up front */ 86 87 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit); 88 89 /* Set the mask bit only if there are references to this GPE */ 90 91 if (gpe_event_info->runtime_count) { 92 ACPI_SET_BIT(gpe_register_info->enable_for_run, 93 (u8)register_bit); 94 } 95 96 return_ACPI_STATUS(AE_OK); 97 } 98 99 /******************************************************************************* 100 * 101 * FUNCTION: acpi_ev_enable_gpe 102 * 103 * PARAMETERS: gpe_event_info - GPE to enable 104 * 105 * RETURN: Status 106 * 107 * DESCRIPTION: Clear a GPE of stale events and enable it. 108 * 109 ******************************************************************************/ 110 111 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) 112 { 113 acpi_status status; 114 115 ACPI_FUNCTION_TRACE(ev_enable_gpe); 116 117 /* 118 * We will only allow a GPE to be enabled if it has either an associated 119 * method (_Lxx/_Exx) or a handler, or is using the implicit notify 120 * feature. Otherwise, the GPE will be immediately disabled by 121 * acpi_ev_gpe_dispatch the first time it fires. 122 */ 123 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == 124 ACPI_GPE_DISPATCH_NONE) { 125 return_ACPI_STATUS(AE_NO_HANDLER); 126 } 127 128 /* Clear the GPE (of stale events) */ 129 130 status = acpi_hw_clear_gpe(gpe_event_info); 131 if (ACPI_FAILURE(status)) { 132 return_ACPI_STATUS(status); 133 } 134 135 /* Enable the requested GPE */ 136 137 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE_SAVE); 138 return_ACPI_STATUS(status); 139 } 140 141 /******************************************************************************* 142 * 143 * FUNCTION: acpi_ev_add_gpe_reference 144 * 145 * PARAMETERS: gpe_event_info - Add a reference to this GPE 146 * 147 * RETURN: Status 148 * 149 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is 150 * hardware-enabled. 151 * 152 ******************************************************************************/ 153 154 acpi_status 155 acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 156 { 157 acpi_status status = AE_OK; 158 159 ACPI_FUNCTION_TRACE(ev_add_gpe_reference); 160 161 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) { 162 return_ACPI_STATUS(AE_LIMIT); 163 } 164 165 gpe_event_info->runtime_count++; 166 if (gpe_event_info->runtime_count == 1) { 167 168 /* Enable on first reference */ 169 170 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 171 if (ACPI_SUCCESS(status)) { 172 status = acpi_ev_enable_gpe(gpe_event_info); 173 } 174 175 if (ACPI_FAILURE(status)) { 176 gpe_event_info->runtime_count--; 177 } 178 } 179 180 return_ACPI_STATUS(status); 181 } 182 183 /******************************************************************************* 184 * 185 * FUNCTION: acpi_ev_remove_gpe_reference 186 * 187 * PARAMETERS: gpe_event_info - Remove a reference to this GPE 188 * 189 * RETURN: Status 190 * 191 * DESCRIPTION: Remove a reference to a GPE. When the last reference is 192 * removed, the GPE is hardware-disabled. 193 * 194 ******************************************************************************/ 195 196 acpi_status 197 acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 198 { 199 acpi_status status = AE_OK; 200 201 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference); 202 203 if (!gpe_event_info->runtime_count) { 204 return_ACPI_STATUS(AE_LIMIT); 205 } 206 207 gpe_event_info->runtime_count--; 208 if (!gpe_event_info->runtime_count) { 209 210 /* Disable on last reference */ 211 212 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 213 if (ACPI_SUCCESS(status)) { 214 status = 215 acpi_hw_low_set_gpe(gpe_event_info, 216 ACPI_GPE_DISABLE_SAVE); 217 } 218 219 if (ACPI_FAILURE(status)) { 220 gpe_event_info->runtime_count++; 221 } 222 } 223 224 return_ACPI_STATUS(status); 225 } 226 227 /******************************************************************************* 228 * 229 * FUNCTION: acpi_ev_low_get_gpe_info 230 * 231 * PARAMETERS: gpe_number - Raw GPE number 232 * gpe_block - A GPE info block 233 * 234 * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number 235 * is not within the specified GPE block) 236 * 237 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is 238 * the low-level implementation of ev_get_gpe_event_info. 239 * 240 ******************************************************************************/ 241 242 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number, 243 struct acpi_gpe_block_info 244 *gpe_block) 245 { 246 u32 gpe_index; 247 248 /* 249 * Validate that the gpe_number is within the specified gpe_block. 250 * (Two steps) 251 */ 252 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) { 253 return (NULL); 254 } 255 256 gpe_index = gpe_number - gpe_block->block_base_number; 257 if (gpe_index >= gpe_block->gpe_count) { 258 return (NULL); 259 } 260 261 return (&gpe_block->event_info[gpe_index]); 262 } 263 264 265 /******************************************************************************* 266 * 267 * FUNCTION: acpi_ev_get_gpe_event_info 268 * 269 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 270 * gpe_number - Raw GPE number 271 * 272 * RETURN: A GPE event_info struct. NULL if not a valid GPE 273 * 274 * DESCRIPTION: Returns the event_info struct associated with this GPE. 275 * Validates the gpe_block and the gpe_number 276 * 277 * Should be called only when the GPE lists are semaphore locked 278 * and not subject to change. 279 * 280 ******************************************************************************/ 281 282 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device, 283 u32 gpe_number) 284 { 285 union acpi_operand_object *obj_desc; 286 struct acpi_gpe_event_info *gpe_info; 287 u32 i; 288 289 ACPI_FUNCTION_ENTRY(); 290 291 /* A NULL gpe_device means use the FADT-defined GPE block(s) */ 292 293 if (!gpe_device) { 294 295 /* Examine GPE Block 0 and 1 (These blocks are permanent) */ 296 297 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { 298 gpe_info = acpi_ev_low_get_gpe_info(gpe_number, 299 acpi_gbl_gpe_fadt_blocks 300 [i]); 301 if (gpe_info) { 302 return (gpe_info); 303 } 304 } 305 306 /* The gpe_number was not in the range of either FADT GPE block */ 307 308 return (NULL); 309 } 310 311 /* A Non-NULL gpe_device means this is a GPE Block Device */ 312 313 obj_desc = 314 acpi_ns_get_attached_object((struct acpi_namespace_node *) 315 gpe_device); 316 if (!obj_desc || !obj_desc->device.gpe_block) { 317 return (NULL); 318 } 319 320 return (acpi_ev_low_get_gpe_info 321 (gpe_number, obj_desc->device.gpe_block)); 322 } 323 324 /******************************************************************************* 325 * 326 * FUNCTION: acpi_ev_gpe_detect 327 * 328 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt. 329 * Can have multiple GPE blocks attached. 330 * 331 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 332 * 333 * DESCRIPTION: Detect if any GP events have occurred. This function is 334 * executed at interrupt level. 335 * 336 ******************************************************************************/ 337 338 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list) 339 { 340 acpi_status status; 341 struct acpi_gpe_block_info *gpe_block; 342 struct acpi_gpe_register_info *gpe_register_info; 343 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; 344 u8 enabled_status_byte; 345 u32 status_reg; 346 u32 enable_reg; 347 acpi_cpu_flags flags; 348 u32 i; 349 u32 j; 350 351 ACPI_FUNCTION_NAME(ev_gpe_detect); 352 353 /* Check for the case where there are no GPEs */ 354 355 if (!gpe_xrupt_list) { 356 return (int_status); 357 } 358 359 /* 360 * We need to obtain the GPE lock for both the data structs and registers 361 * Note: Not necessary to obtain the hardware lock, since the GPE 362 * registers are owned by the gpe_lock. 363 */ 364 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 365 366 /* Examine all GPE blocks attached to this interrupt level */ 367 368 gpe_block = gpe_xrupt_list->gpe_block_list_head; 369 while (gpe_block) { 370 /* 371 * Read all of the 8-bit GPE status and enable registers in this GPE 372 * block, saving all of them. Find all currently active GP events. 373 */ 374 for (i = 0; i < gpe_block->register_count; i++) { 375 376 /* Get the next status/enable pair */ 377 378 gpe_register_info = &gpe_block->register_info[i]; 379 380 /* 381 * Optimization: If there are no GPEs enabled within this 382 * register, we can safely ignore the entire register. 383 */ 384 if (!(gpe_register_info->enable_for_run | 385 gpe_register_info->enable_for_wake)) { 386 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 387 "Ignore disabled registers for GPE %02X-%02X: " 388 "RunEnable=%02X, WakeEnable=%02X\n", 389 gpe_register_info-> 390 base_gpe_number, 391 gpe_register_info-> 392 base_gpe_number + 393 (ACPI_GPE_REGISTER_WIDTH - 1), 394 gpe_register_info-> 395 enable_for_run, 396 gpe_register_info-> 397 enable_for_wake)); 398 continue; 399 } 400 401 /* Read the Status Register */ 402 403 status = 404 acpi_hw_read(&status_reg, 405 &gpe_register_info->status_address); 406 if (ACPI_FAILURE(status)) { 407 goto unlock_and_exit; 408 } 409 410 /* Read the Enable Register */ 411 412 status = 413 acpi_hw_read(&enable_reg, 414 &gpe_register_info->enable_address); 415 if (ACPI_FAILURE(status)) { 416 goto unlock_and_exit; 417 } 418 419 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 420 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, " 421 "RunEnable=%02X, WakeEnable=%02X\n", 422 gpe_register_info->base_gpe_number, 423 gpe_register_info->base_gpe_number + 424 (ACPI_GPE_REGISTER_WIDTH - 1), 425 status_reg, enable_reg, 426 gpe_register_info->enable_for_run, 427 gpe_register_info->enable_for_wake)); 428 429 /* Check if there is anything active at all in this register */ 430 431 enabled_status_byte = (u8)(status_reg & enable_reg); 432 if (!enabled_status_byte) { 433 434 /* No active GPEs in this register, move on */ 435 436 continue; 437 } 438 439 /* Now look at the individual GPEs in this byte register */ 440 441 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 442 443 /* Examine one GPE bit */ 444 445 if (enabled_status_byte & (1 << j)) { 446 /* 447 * Found an active GPE. Dispatch the event to a handler 448 * or method. 449 */ 450 int_status |= 451 acpi_ev_gpe_dispatch(gpe_block-> 452 node, 453 &gpe_block-> 454 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number); 455 } 456 } 457 } 458 459 gpe_block = gpe_block->next; 460 } 461 462 unlock_and_exit: 463 464 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 465 return (int_status); 466 } 467 468 /******************************************************************************* 469 * 470 * FUNCTION: acpi_ev_asynch_execute_gpe_method 471 * 472 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 473 * 474 * RETURN: None 475 * 476 * DESCRIPTION: Perform the actual execution of a GPE control method. This 477 * function is called from an invocation of acpi_os_execute and 478 * therefore does NOT execute at interrupt level - so that 479 * the control method itself is not executed in the context of 480 * an interrupt handler. 481 * 482 ******************************************************************************/ 483 484 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) 485 { 486 struct acpi_gpe_event_info *gpe_event_info = context; 487 acpi_status status; 488 struct acpi_gpe_event_info *local_gpe_event_info; 489 struct acpi_evaluate_info *info; 490 struct acpi_gpe_notify_info *notify; 491 492 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method); 493 494 /* Allocate a local GPE block */ 495 496 local_gpe_event_info = 497 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_event_info)); 498 if (!local_gpe_event_info) { 499 ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "while handling a GPE")); 500 return_VOID; 501 } 502 503 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 504 if (ACPI_FAILURE(status)) { 505 ACPI_FREE(local_gpe_event_info); 506 return_VOID; 507 } 508 509 /* Must revalidate the gpe_number/gpe_block */ 510 511 if (!acpi_ev_valid_gpe_event(gpe_event_info)) { 512 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS); 513 ACPI_FREE(local_gpe_event_info); 514 return_VOID; 515 } 516 517 /* 518 * Take a snapshot of the GPE info for this level - we copy the info to 519 * prevent a race condition with remove_handler/remove_block. 520 */ 521 ACPI_MEMCPY(local_gpe_event_info, gpe_event_info, 522 sizeof(struct acpi_gpe_event_info)); 523 524 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS); 525 if (ACPI_FAILURE(status)) { 526 ACPI_FREE(local_gpe_event_info); 527 return_VOID; 528 } 529 530 /* Do the correct dispatch - normal method or implicit notify */ 531 532 switch (local_gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) { 533 case ACPI_GPE_DISPATCH_NOTIFY: 534 /* 535 * Implicit notify. 536 * Dispatch a DEVICE_WAKE notify to the appropriate handler. 537 * NOTE: the request is queued for execution after this method 538 * completes. The notify handlers are NOT invoked synchronously 539 * from this thread -- because handlers may in turn run other 540 * control methods. 541 * 542 * June 2012: Expand implicit notify mechanism to support 543 * notifies on multiple device objects. 544 */ 545 notify = local_gpe_event_info->dispatch.notify_list; 546 while (ACPI_SUCCESS(status) && notify) { 547 status = 548 acpi_ev_queue_notify_request(notify->device_node, 549 ACPI_NOTIFY_DEVICE_WAKE); 550 551 notify = notify->next; 552 } 553 554 break; 555 556 case ACPI_GPE_DISPATCH_METHOD: 557 558 /* Allocate the evaluation information block */ 559 560 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 561 if (!info) { 562 status = AE_NO_MEMORY; 563 } else { 564 /* 565 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the 566 * _Lxx/_Exx control method that corresponds to this GPE 567 */ 568 info->prefix_node = 569 local_gpe_event_info->dispatch.method_node; 570 info->flags = ACPI_IGNORE_RETURN_VALUE; 571 572 status = acpi_ns_evaluate(info); 573 ACPI_FREE(info); 574 } 575 576 if (ACPI_FAILURE(status)) { 577 ACPI_EXCEPTION((AE_INFO, status, 578 "while evaluating GPE method [%4.4s]", 579 acpi_ut_get_node_name 580 (local_gpe_event_info->dispatch. 581 method_node))); 582 } 583 break; 584 585 default: 586 587 return_VOID; /* Should never happen */ 588 } 589 590 /* Defer enabling of GPE until all notify handlers are done */ 591 592 status = acpi_os_execute(OSL_NOTIFY_HANDLER, 593 acpi_ev_asynch_enable_gpe, 594 local_gpe_event_info); 595 if (ACPI_FAILURE(status)) { 596 ACPI_FREE(local_gpe_event_info); 597 } 598 return_VOID; 599 } 600 601 602 /******************************************************************************* 603 * 604 * FUNCTION: acpi_ev_asynch_enable_gpe 605 * 606 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 607 * Callback from acpi_os_execute 608 * 609 * RETURN: None 610 * 611 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to 612 * complete (i.e., finish execution of Notify) 613 * 614 ******************************************************************************/ 615 616 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context) 617 { 618 struct acpi_gpe_event_info *gpe_event_info = context; 619 acpi_cpu_flags flags; 620 621 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 622 (void)acpi_ev_finish_gpe(gpe_event_info); 623 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 624 625 ACPI_FREE(gpe_event_info); 626 return; 627 } 628 629 630 /******************************************************************************* 631 * 632 * FUNCTION: acpi_ev_finish_gpe 633 * 634 * PARAMETERS: gpe_event_info - Info for this GPE 635 * 636 * RETURN: Status 637 * 638 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution 639 * of a GPE method or a synchronous or asynchronous GPE handler. 640 * 641 ******************************************************************************/ 642 643 acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info * gpe_event_info) 644 { 645 acpi_status status; 646 647 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 648 ACPI_GPE_LEVEL_TRIGGERED) { 649 /* 650 * GPE is level-triggered, we clear the GPE status bit after 651 * handling the event. 652 */ 653 status = acpi_hw_clear_gpe(gpe_event_info); 654 if (ACPI_FAILURE(status)) { 655 return (status); 656 } 657 } 658 659 /* 660 * Enable this GPE, conditionally. This means that the GPE will 661 * only be physically enabled if the enable_mask bit is set 662 * in the event_info. 663 */ 664 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE); 665 return (AE_OK); 666 } 667 668 669 /******************************************************************************* 670 * 671 * FUNCTION: acpi_ev_gpe_dispatch 672 * 673 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 674 * gpe_event_info - Info for this GPE 675 * gpe_number - Number relative to the parent GPE block 676 * 677 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 678 * 679 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) 680 * or method (e.g. _Lxx/_Exx) handler. 681 * 682 * This function executes at interrupt level. 683 * 684 ******************************************************************************/ 685 686 u32 687 acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, 688 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) 689 { 690 acpi_status status; 691 u32 return_value; 692 693 ACPI_FUNCTION_TRACE(ev_gpe_dispatch); 694 695 /* Invoke global event handler if present */ 696 697 acpi_gpe_count++; 698 if (acpi_gbl_global_event_handler) { 699 acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE, gpe_device, 700 gpe_number, 701 acpi_gbl_global_event_handler_context); 702 } 703 704 /* 705 * Always disable the GPE so that it does not keep firing before 706 * any asynchronous activity completes (either from the execution 707 * of a GPE method or an asynchronous GPE handler.) 708 * 709 * If there is no handler or method to run, just disable the 710 * GPE and leave it disabled permanently to prevent further such 711 * pointless events from firing. 712 */ 713 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); 714 if (ACPI_FAILURE(status)) { 715 ACPI_EXCEPTION((AE_INFO, status, 716 "Unable to disable GPE %02X", gpe_number)); 717 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 718 } 719 720 /* 721 * If edge-triggered, clear the GPE status bit now. Note that 722 * level-triggered events are cleared after the GPE is serviced. 723 */ 724 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 725 ACPI_GPE_EDGE_TRIGGERED) { 726 status = acpi_hw_clear_gpe(gpe_event_info); 727 if (ACPI_FAILURE(status)) { 728 ACPI_EXCEPTION((AE_INFO, status, 729 "Unable to clear GPE %02X", 730 gpe_number)); 731 (void)acpi_hw_low_set_gpe(gpe_event_info, 732 ACPI_GPE_CONDITIONAL_ENABLE); 733 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 734 } 735 } 736 737 /* 738 * Dispatch the GPE to either an installed handler or the control 739 * method associated with this GPE (_Lxx or _Exx). If a handler 740 * exists, we invoke it and do not attempt to run the method. 741 * If there is neither a handler nor a method, leave the GPE 742 * disabled. 743 */ 744 switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) { 745 case ACPI_GPE_DISPATCH_HANDLER: 746 747 /* Invoke the installed handler (at interrupt level) */ 748 749 return_value = 750 gpe_event_info->dispatch.handler->address(gpe_device, 751 gpe_number, 752 gpe_event_info-> 753 dispatch.handler-> 754 context); 755 756 /* If requested, clear (if level-triggered) and reenable the GPE */ 757 758 if (return_value & ACPI_REENABLE_GPE) { 759 (void)acpi_ev_finish_gpe(gpe_event_info); 760 } 761 break; 762 763 case ACPI_GPE_DISPATCH_METHOD: 764 case ACPI_GPE_DISPATCH_NOTIFY: 765 /* 766 * Execute the method associated with the GPE 767 * NOTE: Level-triggered GPEs are cleared after the method completes. 768 */ 769 status = acpi_os_execute(OSL_GPE_HANDLER, 770 acpi_ev_asynch_execute_gpe_method, 771 gpe_event_info); 772 if (ACPI_FAILURE(status)) { 773 ACPI_EXCEPTION((AE_INFO, status, 774 "Unable to queue handler for GPE %02X - event disabled", 775 gpe_number)); 776 } 777 break; 778 779 default: 780 /* 781 * No handler or method to run! 782 * 03/2010: This case should no longer be possible. We will not allow 783 * a GPE to be enabled if it has no handler or method. 784 */ 785 ACPI_ERROR((AE_INFO, 786 "No handler or method for GPE %02X, disabling event", 787 gpe_number)); 788 789 break; 790 } 791 792 return_UINT32(ACPI_INTERRUPT_HANDLED); 793 } 794 795 #endif /* !ACPI_REDUCED_HARDWARE */ 796