1 /****************************************************************************** 2 * 3 * Module Name: evgpe - General Purpose Event handling and dispatch 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 gpe_register_info->enable_mask = gpe_register_info->enable_for_run; 97 return_ACPI_STATUS(AE_OK); 98 } 99 100 /******************************************************************************* 101 * 102 * FUNCTION: acpi_ev_enable_gpe 103 * 104 * PARAMETERS: gpe_event_info - GPE to enable 105 * 106 * RETURN: Status 107 * 108 * DESCRIPTION: Clear a GPE of stale events and enable it. 109 * 110 ******************************************************************************/ 111 112 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) 113 { 114 acpi_status status; 115 116 ACPI_FUNCTION_TRACE(ev_enable_gpe); 117 118 /* Clear the GPE (of stale events) */ 119 120 status = acpi_hw_clear_gpe(gpe_event_info); 121 if (ACPI_FAILURE(status)) { 122 return_ACPI_STATUS(status); 123 } 124 125 /* Enable the requested GPE */ 126 127 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE); 128 return_ACPI_STATUS(status); 129 } 130 131 /******************************************************************************* 132 * 133 * FUNCTION: acpi_ev_mask_gpe 134 * 135 * PARAMETERS: gpe_event_info - GPE to be blocked/unblocked 136 * is_masked - Whether the GPE is masked or not 137 * 138 * RETURN: Status 139 * 140 * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime. 141 * 142 ******************************************************************************/ 143 144 acpi_status 145 acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked) 146 { 147 struct acpi_gpe_register_info *gpe_register_info; 148 u32 register_bit; 149 150 ACPI_FUNCTION_TRACE(ev_mask_gpe); 151 152 gpe_register_info = gpe_event_info->register_info; 153 if (!gpe_register_info) { 154 return_ACPI_STATUS(AE_NOT_EXIST); 155 } 156 157 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); 158 159 /* Perform the action */ 160 161 if (is_masked) { 162 if (register_bit & gpe_register_info->mask_for_run) { 163 return_ACPI_STATUS(AE_BAD_PARAMETER); 164 } 165 166 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); 167 ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit); 168 } else { 169 if (!(register_bit & gpe_register_info->mask_for_run)) { 170 return_ACPI_STATUS(AE_BAD_PARAMETER); 171 } 172 173 ACPI_CLEAR_BIT(gpe_register_info->mask_for_run, 174 (u8)register_bit); 175 if (gpe_event_info->runtime_count 176 && !gpe_event_info->disable_for_dispatch) { 177 (void)acpi_hw_low_set_gpe(gpe_event_info, 178 ACPI_GPE_ENABLE); 179 } 180 } 181 182 return_ACPI_STATUS(AE_OK); 183 } 184 185 /******************************************************************************* 186 * 187 * FUNCTION: acpi_ev_add_gpe_reference 188 * 189 * PARAMETERS: gpe_event_info - Add a reference to this GPE 190 * 191 * RETURN: Status 192 * 193 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is 194 * hardware-enabled. 195 * 196 ******************************************************************************/ 197 198 acpi_status 199 acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 200 { 201 acpi_status status = AE_OK; 202 203 ACPI_FUNCTION_TRACE(ev_add_gpe_reference); 204 205 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) { 206 return_ACPI_STATUS(AE_LIMIT); 207 } 208 209 gpe_event_info->runtime_count++; 210 if (gpe_event_info->runtime_count == 1) { 211 212 /* Enable on first reference */ 213 214 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 215 if (ACPI_SUCCESS(status)) { 216 status = acpi_ev_enable_gpe(gpe_event_info); 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_remove_gpe_reference 230 * 231 * PARAMETERS: gpe_event_info - Remove a reference to this GPE 232 * 233 * RETURN: Status 234 * 235 * DESCRIPTION: Remove a reference to a GPE. When the last reference is 236 * removed, the GPE is hardware-disabled. 237 * 238 ******************************************************************************/ 239 240 acpi_status 241 acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 242 { 243 acpi_status status = AE_OK; 244 245 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference); 246 247 if (!gpe_event_info->runtime_count) { 248 return_ACPI_STATUS(AE_LIMIT); 249 } 250 251 gpe_event_info->runtime_count--; 252 if (!gpe_event_info->runtime_count) { 253 254 /* Disable on last reference */ 255 256 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 257 if (ACPI_SUCCESS(status)) { 258 status = 259 acpi_hw_low_set_gpe(gpe_event_info, 260 ACPI_GPE_DISABLE); 261 } 262 263 if (ACPI_FAILURE(status)) { 264 gpe_event_info->runtime_count++; 265 } 266 } 267 268 return_ACPI_STATUS(status); 269 } 270 271 /******************************************************************************* 272 * 273 * FUNCTION: acpi_ev_low_get_gpe_info 274 * 275 * PARAMETERS: gpe_number - Raw GPE number 276 * gpe_block - A GPE info block 277 * 278 * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number 279 * is not within the specified GPE block) 280 * 281 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is 282 * the low-level implementation of ev_get_gpe_event_info. 283 * 284 ******************************************************************************/ 285 286 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number, 287 struct acpi_gpe_block_info 288 *gpe_block) 289 { 290 u32 gpe_index; 291 292 /* 293 * Validate that the gpe_number is within the specified gpe_block. 294 * (Two steps) 295 */ 296 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) { 297 return (NULL); 298 } 299 300 gpe_index = gpe_number - gpe_block->block_base_number; 301 if (gpe_index >= gpe_block->gpe_count) { 302 return (NULL); 303 } 304 305 return (&gpe_block->event_info[gpe_index]); 306 } 307 308 309 /******************************************************************************* 310 * 311 * FUNCTION: acpi_ev_get_gpe_event_info 312 * 313 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 314 * gpe_number - Raw GPE number 315 * 316 * RETURN: A GPE event_info struct. NULL if not a valid GPE 317 * 318 * DESCRIPTION: Returns the event_info struct associated with this GPE. 319 * Validates the gpe_block and the gpe_number 320 * 321 * Should be called only when the GPE lists are semaphore locked 322 * and not subject to change. 323 * 324 ******************************************************************************/ 325 326 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device, 327 u32 gpe_number) 328 { 329 union acpi_operand_object *obj_desc; 330 struct acpi_gpe_event_info *gpe_info; 331 u32 i; 332 333 ACPI_FUNCTION_ENTRY(); 334 335 /* A NULL gpe_device means use the FADT-defined GPE block(s) */ 336 337 if (!gpe_device) { 338 339 /* Examine GPE Block 0 and 1 (These blocks are permanent) */ 340 341 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { 342 gpe_info = acpi_ev_low_get_gpe_info(gpe_number, 343 acpi_gbl_gpe_fadt_blocks 344 [i]); 345 if (gpe_info) { 346 return (gpe_info); 347 } 348 } 349 350 /* The gpe_number was not in the range of either FADT GPE block */ 351 352 return (NULL); 353 } 354 355 /* A Non-NULL gpe_device means this is a GPE Block Device */ 356 357 obj_desc = 358 acpi_ns_get_attached_object((struct acpi_namespace_node *) 359 gpe_device); 360 if (!obj_desc || !obj_desc->device.gpe_block) { 361 return (NULL); 362 } 363 364 return (acpi_ev_low_get_gpe_info 365 (gpe_number, obj_desc->device.gpe_block)); 366 } 367 368 /******************************************************************************* 369 * 370 * FUNCTION: acpi_ev_gpe_detect 371 * 372 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt. 373 * Can have multiple GPE blocks attached. 374 * 375 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 376 * 377 * DESCRIPTION: Detect if any GP events have occurred. This function is 378 * executed at interrupt level. 379 * 380 ******************************************************************************/ 381 382 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list) 383 { 384 acpi_status status; 385 struct acpi_gpe_block_info *gpe_block; 386 struct acpi_namespace_node *gpe_device; 387 struct acpi_gpe_register_info *gpe_register_info; 388 struct acpi_gpe_event_info *gpe_event_info; 389 u32 gpe_number; 390 struct acpi_gpe_handler_info *gpe_handler_info; 391 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; 392 u8 enabled_status_byte; 393 u32 status_reg; 394 u32 enable_reg; 395 acpi_cpu_flags flags; 396 u32 i; 397 u32 j; 398 399 ACPI_FUNCTION_NAME(ev_gpe_detect); 400 401 /* Check for the case where there are no GPEs */ 402 403 if (!gpe_xrupt_list) { 404 return (int_status); 405 } 406 407 /* 408 * We need to obtain the GPE lock for both the data structs and registers 409 * Note: Not necessary to obtain the hardware lock, since the GPE 410 * registers are owned by the gpe_lock. 411 */ 412 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 413 414 /* Examine all GPE blocks attached to this interrupt level */ 415 416 gpe_block = gpe_xrupt_list->gpe_block_list_head; 417 while (gpe_block) { 418 gpe_device = gpe_block->node; 419 420 /* 421 * Read all of the 8-bit GPE status and enable registers in this GPE 422 * block, saving all of them. Find all currently active GP events. 423 */ 424 for (i = 0; i < gpe_block->register_count; i++) { 425 426 /* Get the next status/enable pair */ 427 428 gpe_register_info = &gpe_block->register_info[i]; 429 430 /* 431 * Optimization: If there are no GPEs enabled within this 432 * register, we can safely ignore the entire register. 433 */ 434 if (!(gpe_register_info->enable_for_run | 435 gpe_register_info->enable_for_wake)) { 436 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 437 "Ignore disabled registers for GPE %02X-%02X: " 438 "RunEnable=%02X, WakeEnable=%02X\n", 439 gpe_register_info-> 440 base_gpe_number, 441 gpe_register_info-> 442 base_gpe_number + 443 (ACPI_GPE_REGISTER_WIDTH - 1), 444 gpe_register_info-> 445 enable_for_run, 446 gpe_register_info-> 447 enable_for_wake)); 448 continue; 449 } 450 451 /* Read the Status Register */ 452 453 status = 454 acpi_hw_read(&status_reg, 455 &gpe_register_info->status_address); 456 if (ACPI_FAILURE(status)) { 457 goto unlock_and_exit; 458 } 459 460 /* Read the Enable Register */ 461 462 status = 463 acpi_hw_read(&enable_reg, 464 &gpe_register_info->enable_address); 465 if (ACPI_FAILURE(status)) { 466 goto unlock_and_exit; 467 } 468 469 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 470 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, " 471 "RunEnable=%02X, WakeEnable=%02X\n", 472 gpe_register_info->base_gpe_number, 473 gpe_register_info->base_gpe_number + 474 (ACPI_GPE_REGISTER_WIDTH - 1), 475 status_reg, enable_reg, 476 gpe_register_info->enable_for_run, 477 gpe_register_info->enable_for_wake)); 478 479 /* Check if there is anything active at all in this register */ 480 481 enabled_status_byte = (u8)(status_reg & enable_reg); 482 if (!enabled_status_byte) { 483 484 /* No active GPEs in this register, move on */ 485 486 continue; 487 } 488 489 /* Now look at the individual GPEs in this byte register */ 490 491 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 492 493 /* Examine one GPE bit */ 494 495 gpe_event_info = 496 &gpe_block-> 497 event_info[((acpi_size)i * 498 ACPI_GPE_REGISTER_WIDTH) + j]; 499 gpe_number = 500 j + gpe_register_info->base_gpe_number; 501 502 if (enabled_status_byte & (1 << j)) { 503 504 /* Invoke global event handler if present */ 505 506 acpi_gpe_count++; 507 if (acpi_gbl_global_event_handler) { 508 acpi_gbl_global_event_handler 509 (ACPI_EVENT_TYPE_GPE, 510 gpe_device, gpe_number, 511 acpi_gbl_global_event_handler_context); 512 } 513 514 /* Found an active GPE */ 515 516 if (ACPI_GPE_DISPATCH_TYPE 517 (gpe_event_info->flags) == 518 ACPI_GPE_DISPATCH_RAW_HANDLER) { 519 520 /* Dispatch the event to a raw handler */ 521 522 gpe_handler_info = 523 gpe_event_info->dispatch. 524 handler; 525 526 /* 527 * There is no protection around the namespace node 528 * and the GPE handler to ensure a safe destruction 529 * because: 530 * 1. The namespace node is expected to always 531 * exist after loading a table. 532 * 2. The GPE handler is expected to be flushed by 533 * acpi_os_wait_events_complete() before the 534 * destruction. 535 */ 536 acpi_os_release_lock 537 (acpi_gbl_gpe_lock, flags); 538 int_status |= 539 gpe_handler_info-> 540 address(gpe_device, 541 gpe_number, 542 gpe_handler_info-> 543 context); 544 flags = 545 acpi_os_acquire_lock 546 (acpi_gbl_gpe_lock); 547 } else { 548 /* 549 * Dispatch the event to a standard handler or 550 * method. 551 */ 552 int_status |= 553 acpi_ev_gpe_dispatch 554 (gpe_device, gpe_event_info, 555 gpe_number); 556 } 557 } 558 } 559 } 560 561 gpe_block = gpe_block->next; 562 } 563 564 unlock_and_exit: 565 566 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 567 return (int_status); 568 } 569 570 /******************************************************************************* 571 * 572 * FUNCTION: acpi_ev_asynch_execute_gpe_method 573 * 574 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 575 * 576 * RETURN: None 577 * 578 * DESCRIPTION: Perform the actual execution of a GPE control method. This 579 * function is called from an invocation of acpi_os_execute and 580 * therefore does NOT execute at interrupt level - so that 581 * the control method itself is not executed in the context of 582 * an interrupt handler. 583 * 584 ******************************************************************************/ 585 586 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) 587 { 588 struct acpi_gpe_event_info *gpe_event_info = context; 589 acpi_status status = AE_OK; 590 struct acpi_evaluate_info *info; 591 struct acpi_gpe_notify_info *notify; 592 593 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method); 594 595 /* Do the correct dispatch - normal method or implicit notify */ 596 597 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { 598 case ACPI_GPE_DISPATCH_NOTIFY: 599 /* 600 * Implicit notify. 601 * Dispatch a DEVICE_WAKE notify to the appropriate handler. 602 * NOTE: the request is queued for execution after this method 603 * completes. The notify handlers are NOT invoked synchronously 604 * from this thread -- because handlers may in turn run other 605 * control methods. 606 * 607 * June 2012: Expand implicit notify mechanism to support 608 * notifies on multiple device objects. 609 */ 610 notify = gpe_event_info->dispatch.notify_list; 611 while (ACPI_SUCCESS(status) && notify) { 612 status = 613 acpi_ev_queue_notify_request(notify->device_node, 614 ACPI_NOTIFY_DEVICE_WAKE); 615 616 notify = notify->next; 617 } 618 619 break; 620 621 case ACPI_GPE_DISPATCH_METHOD: 622 623 /* Allocate the evaluation information block */ 624 625 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 626 if (!info) { 627 status = AE_NO_MEMORY; 628 } else { 629 /* 630 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the 631 * _Lxx/_Exx control method that corresponds to this GPE 632 */ 633 info->prefix_node = 634 gpe_event_info->dispatch.method_node; 635 info->flags = ACPI_IGNORE_RETURN_VALUE; 636 637 status = acpi_ns_evaluate(info); 638 ACPI_FREE(info); 639 } 640 641 if (ACPI_FAILURE(status)) { 642 ACPI_EXCEPTION((AE_INFO, status, 643 "while evaluating GPE method [%4.4s]", 644 acpi_ut_get_node_name(gpe_event_info-> 645 dispatch. 646 method_node))); 647 } 648 break; 649 650 default: 651 652 goto error_exit; /* Should never happen */ 653 } 654 655 /* Defer enabling of GPE until all notify handlers are done */ 656 657 status = acpi_os_execute(OSL_NOTIFY_HANDLER, 658 acpi_ev_asynch_enable_gpe, gpe_event_info); 659 if (ACPI_SUCCESS(status)) { 660 return_VOID; 661 } 662 663 error_exit: 664 acpi_ev_asynch_enable_gpe(gpe_event_info); 665 return_VOID; 666 } 667 668 669 /******************************************************************************* 670 * 671 * FUNCTION: acpi_ev_asynch_enable_gpe 672 * 673 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 674 * Callback from acpi_os_execute 675 * 676 * RETURN: None 677 * 678 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to 679 * complete (i.e., finish execution of Notify) 680 * 681 ******************************************************************************/ 682 683 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context) 684 { 685 struct acpi_gpe_event_info *gpe_event_info = context; 686 acpi_cpu_flags flags; 687 688 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 689 (void)acpi_ev_finish_gpe(gpe_event_info); 690 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 691 692 return; 693 } 694 695 696 /******************************************************************************* 697 * 698 * FUNCTION: acpi_ev_finish_gpe 699 * 700 * PARAMETERS: gpe_event_info - Info for this GPE 701 * 702 * RETURN: Status 703 * 704 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution 705 * of a GPE method or a synchronous or asynchronous GPE handler. 706 * 707 ******************************************************************************/ 708 709 acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info) 710 { 711 acpi_status status; 712 713 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 714 ACPI_GPE_LEVEL_TRIGGERED) { 715 /* 716 * GPE is level-triggered, we clear the GPE status bit after 717 * handling the event. 718 */ 719 status = acpi_hw_clear_gpe(gpe_event_info); 720 if (ACPI_FAILURE(status)) { 721 return (status); 722 } 723 } 724 725 /* 726 * Enable this GPE, conditionally. This means that the GPE will 727 * only be physically enabled if the enable_mask bit is set 728 * in the event_info. 729 */ 730 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE); 731 gpe_event_info->disable_for_dispatch = FALSE; 732 return (AE_OK); 733 } 734 735 736 /******************************************************************************* 737 * 738 * FUNCTION: acpi_ev_gpe_dispatch 739 * 740 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 741 * gpe_event_info - Info for this GPE 742 * gpe_number - Number relative to the parent GPE block 743 * 744 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 745 * 746 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) 747 * or method (e.g. _Lxx/_Exx) handler. 748 * 749 * This function executes at interrupt level. 750 * 751 ******************************************************************************/ 752 753 u32 754 acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, 755 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) 756 { 757 acpi_status status; 758 u32 return_value; 759 760 ACPI_FUNCTION_TRACE(ev_gpe_dispatch); 761 762 /* 763 * Always disable the GPE so that it does not keep firing before 764 * any asynchronous activity completes (either from the execution 765 * of a GPE method or an asynchronous GPE handler.) 766 * 767 * If there is no handler or method to run, just disable the 768 * GPE and leave it disabled permanently to prevent further such 769 * pointless events from firing. 770 */ 771 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); 772 if (ACPI_FAILURE(status)) { 773 ACPI_EXCEPTION((AE_INFO, status, 774 "Unable to disable GPE %02X", gpe_number)); 775 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 776 } 777 778 /* 779 * If edge-triggered, clear the GPE status bit now. Note that 780 * level-triggered events are cleared after the GPE is serviced. 781 */ 782 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 783 ACPI_GPE_EDGE_TRIGGERED) { 784 status = acpi_hw_clear_gpe(gpe_event_info); 785 if (ACPI_FAILURE(status)) { 786 ACPI_EXCEPTION((AE_INFO, status, 787 "Unable to clear GPE %02X", 788 gpe_number)); 789 (void)acpi_hw_low_set_gpe(gpe_event_info, 790 ACPI_GPE_CONDITIONAL_ENABLE); 791 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 792 } 793 } 794 795 gpe_event_info->disable_for_dispatch = TRUE; 796 797 /* 798 * Dispatch the GPE to either an installed handler or the control 799 * method associated with this GPE (_Lxx or _Exx). If a handler 800 * exists, we invoke it and do not attempt to run the method. 801 * If there is neither a handler nor a method, leave the GPE 802 * disabled. 803 */ 804 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { 805 case ACPI_GPE_DISPATCH_HANDLER: 806 807 /* Invoke the installed handler (at interrupt level) */ 808 809 return_value = 810 gpe_event_info->dispatch.handler->address(gpe_device, 811 gpe_number, 812 gpe_event_info-> 813 dispatch.handler-> 814 context); 815 816 /* If requested, clear (if level-triggered) and reenable the GPE */ 817 818 if (return_value & ACPI_REENABLE_GPE) { 819 (void)acpi_ev_finish_gpe(gpe_event_info); 820 } 821 break; 822 823 case ACPI_GPE_DISPATCH_METHOD: 824 case ACPI_GPE_DISPATCH_NOTIFY: 825 /* 826 * Execute the method associated with the GPE 827 * NOTE: Level-triggered GPEs are cleared after the method completes. 828 */ 829 status = acpi_os_execute(OSL_GPE_HANDLER, 830 acpi_ev_asynch_execute_gpe_method, 831 gpe_event_info); 832 if (ACPI_FAILURE(status)) { 833 ACPI_EXCEPTION((AE_INFO, status, 834 "Unable to queue handler for GPE %02X - event disabled", 835 gpe_number)); 836 } 837 break; 838 839 default: 840 /* 841 * No handler or method to run! 842 * 03/2010: This case should no longer be possible. We will not allow 843 * a GPE to be enabled if it has no handler or method. 844 */ 845 ACPI_ERROR((AE_INFO, 846 "No handler or method for GPE %02X, disabling event", 847 gpe_number)); 848 849 break; 850 } 851 852 return_UINT32(ACPI_INTERRUPT_HANDLED); 853 } 854 855 #endif /* !ACPI_REDUCED_HARDWARE */ 856