drivers/acpi/acpica/evgpe.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpe - General Purpose Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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
  52 /* Local prototypes */
  53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_update_gpe_enable_mask
  58  *
  59  * PARAMETERS:  gpe_event_info          - GPE to update
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Updates GPE register enable mask based upon whether there are
  64  *              runtime references to this GPE
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status
  69 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
  70 {
  71         struct acpi_gpe_register_info *gpe_register_info;
  72         u32 register_bit;
  73
  74         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
  75
  76         gpe_register_info = gpe_event_info->register_info;
  77         if (!gpe_register_info) {
  78                 return_ACPI_STATUS(AE_NOT_EXIST);
  79         }
  80
  81         register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info,
  82                                                 gpe_register_info);
  83
  84         /* Clear the run bit up front */
  85
  86         ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
  87
  88         /* Set the mask bit only if there are references to this GPE */
  89
  90         if (gpe_event_info->runtime_count) {
  91                 ACPI_SET_BIT(gpe_register_info->enable_for_run, (u8)register_bit);
  92         }
  93
  94         return_ACPI_STATUS(AE_OK);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ev_enable_gpe
 100  *
 101  * PARAMETERS:  gpe_event_info  - GPE to enable
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Clear the given GPE from stale events and enable it.
 106  *
 107  ******************************************************************************/
 108 acpi_status
 109 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 110 {
 111         acpi_status status;
 112
 113         ACPI_FUNCTION_TRACE(ev_enable_gpe);
 114
 115         /*
 116          * We will only allow a GPE to be enabled if it has either an
 117          * associated method (_Lxx/_Exx) or a handler. Otherwise, the
 118          * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
 119          * first time it fires.
 120          */
 121         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
 122                 return_ACPI_STATUS(AE_NO_HANDLER);
 123         }
 124
 125         /* Clear the GPE (of stale events) */
 126         status = acpi_hw_clear_gpe(gpe_event_info);
 127         if (ACPI_FAILURE(status)) {
 128                 return_ACPI_STATUS(status);
 129         }
 130
 131         /* Enable the requested GPE */
 132         status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
 133
 134         return_ACPI_STATUS(status);
 135 }
 136
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_raw_enable_gpe
 141  *
 142  * PARAMETERS:  gpe_event_info  - GPE to enable
 143  *
 144  * RETURN:      Status
 145  *
 146  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 147  *              hardware-enabled.
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status acpi_raw_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 152 {
 153         acpi_status status = AE_OK;
 154
 155         if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
 156                 return_ACPI_STATUS(AE_LIMIT);
 157         }
 158
 159         gpe_event_info->runtime_count++;
 160         if (gpe_event_info->runtime_count == 1) {
 161                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 162                 if (ACPI_SUCCESS(status)) {
 163                         status = acpi_ev_enable_gpe(gpe_event_info);
 164                 }
 165
 166                 if (ACPI_FAILURE(status)) {
 167                         gpe_event_info->runtime_count--;
 168                 }
 169         }
 170
 171         return_ACPI_STATUS(status);
 172 }
 173
 174 /*******************************************************************************
 175  *
 176  * FUNCTION:    acpi_raw_disable_gpe
 177  *
 178  * PARAMETERS:  gpe_event_info  - GPE to disable
 179  *
 180  * RETURN:      Status
 181  *
 182  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 183  *              removed, the GPE is hardware-disabled.
 184  *
 185  ******************************************************************************/
 186
 187 acpi_status acpi_raw_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 188 {
 189         acpi_status status = AE_OK;
 190
 191         if (!gpe_event_info->runtime_count) {
 192                 return_ACPI_STATUS(AE_LIMIT);
 193         }
 194
 195         gpe_event_info->runtime_count--;
 196         if (!gpe_event_info->runtime_count) {
 197                 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
 198                 if (ACPI_SUCCESS(status)) {
 199                         status = acpi_hw_low_set_gpe(gpe_event_info,
 200                                                      ACPI_GPE_DISABLE);
 201                 }
 202
 203                 if (ACPI_FAILURE(status)) {
 204                         gpe_event_info->runtime_count++;
 205                 }
 206         }
 207
 208         return_ACPI_STATUS(status);
 209 }
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_ev_low_get_gpe_info
 214  *
 215  * PARAMETERS:  gpe_number          - Raw GPE number
 216  *              gpe_block           - A GPE info block
 217  *
 218  * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 219  *              is not within the specified GPE block)
 220  *
 221  * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 222  *              the low-level implementation of ev_get_gpe_event_info.
 223  *
 224  ******************************************************************************/
 225
 226 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
 227                                                      struct acpi_gpe_block_info
 228                                                      *gpe_block)
 229 {
 230         u32 gpe_index;
 231
 232         /*
 233          * Validate that the gpe_number is within the specified gpe_block.
 234          * (Two steps)
 235          */
 236         if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
 237                 return (NULL);
 238         }
 239
 240         gpe_index = gpe_number - gpe_block->block_base_number;
 241         if (gpe_index >= gpe_block->gpe_count) {
 242                 return (NULL);
 243         }
 244
 245         return (&gpe_block->event_info[gpe_index]);
 246 }
 247
 248
 249 /*******************************************************************************
 250  *
 251  * FUNCTION:    acpi_ev_get_gpe_event_info
 252  *
 253  * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 254  *              gpe_number          - Raw GPE number
 255  *
 256  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 257  *
 258  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 259  *              Validates the gpe_block and the gpe_number
 260  *
 261  *              Should be called only when the GPE lists are semaphore locked
 262  *              and not subject to change.
 263  *
 264  ******************************************************************************/
 265
 266 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 267                                                        u32 gpe_number)
 268 {
 269         union acpi_operand_object *obj_desc;
 270         struct acpi_gpe_event_info *gpe_info;
 271         u32 i;
 272
 273         ACPI_FUNCTION_ENTRY();
 274
 275         /* A NULL gpe_device means use the FADT-defined GPE block(s) */
 276
 277         if (!gpe_device) {
 278
 279                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 280
 281                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 282                         gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
 283                                                             acpi_gbl_gpe_fadt_blocks
 284                                                             [i]);
 285                         if (gpe_info) {
 286                                 return (gpe_info);
 287                         }
 288                 }
 289
 290                 /* The gpe_number was not in the range of either FADT GPE block */
 291
 292                 return (NULL);
 293         }
 294
 295         /* A Non-NULL gpe_device means this is a GPE Block Device */
 296
 297         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
 298                                                gpe_device);
 299         if (!obj_desc || !obj_desc->device.gpe_block) {
 300                 return (NULL);
 301         }
 302
 303         return (acpi_ev_low_get_gpe_info
 304                 (gpe_number, obj_desc->device.gpe_block));
 305 }
 306
 307 /*******************************************************************************
 308  *
 309  * FUNCTION:    acpi_ev_gpe_detect
 310  *
 311  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 312  *                                    Can have multiple GPE blocks attached.
 313  *
 314  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 315  *
 316  * DESCRIPTION: Detect if any GP events have occurred. This function is
 317  *              executed at interrupt level.
 318  *
 319  ******************************************************************************/
 320
 321 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 322 {
 323         acpi_status status;
 324         struct acpi_gpe_block_info *gpe_block;
 325         struct acpi_gpe_register_info *gpe_register_info;
 326         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 327         u8 enabled_status_byte;
 328         u32 status_reg;
 329         u32 enable_reg;
 330         acpi_cpu_flags flags;
 331         u32 i;
 332         u32 j;
 333
 334         ACPI_FUNCTION_NAME(ev_gpe_detect);
 335
 336         /* Check for the case where there are no GPEs */
 337
 338         if (!gpe_xrupt_list) {
 339                 return (int_status);
 340         }
 341
 342         /*
 343          * We need to obtain the GPE lock for both the data structs and registers
 344          * Note: Not necessary to obtain the hardware lock, since the GPE
 345          * registers are owned by the gpe_lock.
 346          */
 347         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 348
 349         /* Examine all GPE blocks attached to this interrupt level */
 350
 351         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 352         while (gpe_block) {
 353                 /*
 354                  * Read all of the 8-bit GPE status and enable registers in this GPE
 355                  * block, saving all of them. Find all currently active GP events.
 356                  */
 357                 for (i = 0; i < gpe_block->register_count; i++) {
 358
 359                         /* Get the next status/enable pair */
 360
 361                         gpe_register_info = &gpe_block->register_info[i];
 362
 363                         /* Read the Status Register */
 364
 365                         status =
 366                             acpi_hw_read(&status_reg,
 367                                          &gpe_register_info->status_address);
 368                         if (ACPI_FAILURE(status)) {
 369                                 goto unlock_and_exit;
 370                         }
 371
 372                         /* Read the Enable Register */
 373
 374                         status =
 375                             acpi_hw_read(&enable_reg,
 376                                          &gpe_register_info->enable_address);
 377                         if (ACPI_FAILURE(status)) {
 378                                 goto unlock_and_exit;
 379                         }
 380
 381                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 382                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 383                                           gpe_register_info->base_gpe_number,
 384                                           status_reg, enable_reg));
 385
 386                         /* Check if there is anything active at all in this register */
 387
 388                         enabled_status_byte = (u8) (status_reg & enable_reg);
 389                         if (!enabled_status_byte) {
 390
 391                                 /* No active GPEs in this register, move on */
 392
 393                                 continue;
 394                         }
 395
 396                         /* Now look at the individual GPEs in this byte register */
 397
 398                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 399
 400                                 /* Examine one GPE bit */
 401
 402                                 if (enabled_status_byte & (1 << j)) {
 403                                         /*
 404                                          * Found an active GPE. Dispatch the event to a handler
 405                                          * or method.
 406                                          */
 407                                         int_status |=
 408                                             acpi_ev_gpe_dispatch(&gpe_block->
 409                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
 410                                 }
 411                         }
 412                 }
 413
 414                 gpe_block = gpe_block->next;
 415         }
 416
 417       unlock_and_exit:
 418
 419         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 420         return (int_status);
 421 }
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 426  *
 427  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 428  *
 429  * RETURN:      None
 430  *
 431  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 432  *              function is called from an invocation of acpi_os_execute and
 433  *              therefore does NOT execute at interrupt level - so that
 434  *              the control method itself is not executed in the context of
 435  *              an interrupt handler.
 436  *
 437  ******************************************************************************/
 438 static void acpi_ev_asynch_enable_gpe(void *context);
 439
 440 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 441 {
 442         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 443         acpi_status status;
 444         struct acpi_gpe_event_info local_gpe_event_info;
 445         struct acpi_evaluate_info *info;
 446
 447         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 448
 449         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 450         if (ACPI_FAILURE(status)) {
 451                 return_VOID;
 452         }
 453
 454         /* Must revalidate the gpe_number/gpe_block */
 455
 456         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 457                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 458                 return_VOID;
 459         }
 460
 461         /*
 462          * Take a snapshot of the GPE info for this level - we copy the info to
 463          * prevent a race condition with remove_handler/remove_block.
 464          */
 465         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 466                     sizeof(struct acpi_gpe_event_info));
 467
 468         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 469         if (ACPI_FAILURE(status)) {
 470                 return_VOID;
 471         }
 472
 473         /*
 474          * Must check for control method type dispatch one more time to avoid a
 475          * race with ev_gpe_install_handler
 476          */
 477         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 478             ACPI_GPE_DISPATCH_METHOD) {
 479
 480                 /* Allocate the evaluation information block */
 481
 482                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 483                 if (!info) {
 484                         status = AE_NO_MEMORY;
 485                 } else {
 486                         /*
 487                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 488                          * control method that corresponds to this GPE
 489                          */
 490                         info->prefix_node =
 491                             local_gpe_event_info.dispatch.method_node;
 492                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 493
 494                         status = acpi_ns_evaluate(info);
 495                         ACPI_FREE(info);
 496                 }
 497
 498                 if (ACPI_FAILURE(status)) {
 499                         ACPI_EXCEPTION((AE_INFO, status,
 500                                         "while evaluating GPE method [%4.4s]",
 501                                         acpi_ut_get_node_name
 502                                         (local_gpe_event_info.dispatch.
 503                                          method_node)));
 504                 }
 505         }
 506         /* Defer enabling of GPE until all notify handlers are done */
 507         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
 508                                 gpe_event_info);
 509         return_VOID;
 510 }
 511
 512 static void acpi_ev_asynch_enable_gpe(void *context)
 513 {
 514         struct acpi_gpe_event_info *gpe_event_info = context;
 515         acpi_status status;
 516         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 517             ACPI_GPE_LEVEL_TRIGGERED) {
 518                 /*
 519                  * GPE is level-triggered, we clear the GPE status bit after handling
 520                  * the event.
 521                  */
 522                 status = acpi_hw_clear_gpe(gpe_event_info);
 523                 if (ACPI_FAILURE(status)) {
 524                         return_VOID;
 525                 }
 526         }
 527
 528         /*
 529          * Enable this GPE, conditionally. This means that the GPE will only be
 530          * physically enabled if the enable_for_run bit is set in the event_info
 531          */
 532         (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_COND_ENABLE);
 533
 534         return_VOID;
 535 }
 536
 537 /*******************************************************************************
 538  *
 539  * FUNCTION:    acpi_ev_gpe_dispatch
 540  *
 541  * PARAMETERS:  gpe_event_info  - Info for this GPE
 542  *              gpe_number      - Number relative to the parent GPE block
 543  *
 544  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 545  *
 546  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 547  *              or method (e.g. _Lxx/_Exx) handler.
 548  *
 549  *              This function executes at interrupt level.
 550  *
 551  ******************************************************************************/
 552
 553 u32
 554 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 555 {
 556         acpi_status status;
 557
 558         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 559
 560         acpi_os_gpe_count(gpe_number);
 561
 562         /*
 563          * If edge-triggered, clear the GPE status bit now. Note that
 564          * level-triggered events are cleared after the GPE is serviced.
 565          */
 566         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 567             ACPI_GPE_EDGE_TRIGGERED) {
 568                 status = acpi_hw_clear_gpe(gpe_event_info);
 569                 if (ACPI_FAILURE(status)) {
 570                         ACPI_EXCEPTION((AE_INFO, status,
 571                                         "Unable to clear GPE[0x%2X]",
 572                                         gpe_number));
 573                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 574                 }
 575         }
 576
 577         /*
 578          * Dispatch the GPE to either an installed handler, or the control method
 579          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
 580          * it and do not attempt to run the method. If there is neither a handler
 581          * nor a method, we disable this GPE to prevent further such pointless
 582          * events from firing.
 583          */
 584         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 585         case ACPI_GPE_DISPATCH_HANDLER:
 586
 587                 /*
 588                  * Invoke the installed handler (at interrupt level)
 589                  * Ignore return status for now.
 590                  * TBD: leave GPE disabled on error?
 591                  */
 592                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 593                                                                 dispatch.
 594                                                                 handler->
 595                                                                 context);
 596
 597                 /* It is now safe to clear level-triggered events. */
 598
 599                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 600                     ACPI_GPE_LEVEL_TRIGGERED) {
 601                         status = acpi_hw_clear_gpe(gpe_event_info);
 602                         if (ACPI_FAILURE(status)) {
 603                                 ACPI_EXCEPTION((AE_INFO, status,
 604                                         "Unable to clear GPE[0x%2X]",
 605                                                 gpe_number));
 606                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 607                         }
 608                 }
 609                 break;
 610
 611         case ACPI_GPE_DISPATCH_METHOD:
 612
 613                 /*
 614                  * Disable the GPE, so it doesn't keep firing before the method has a
 615                  * chance to run (it runs asynchronously with interrupts enabled).
 616                  */
 617                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 618                 if (ACPI_FAILURE(status)) {
 619                         ACPI_EXCEPTION((AE_INFO, status,
 620                                         "Unable to disable GPE[0x%2X]",
 621                                         gpe_number));
 622                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 623                 }
 624
 625                 /*
 626                  * Execute the method associated with the GPE
 627                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 628                  */
 629                 status = acpi_os_execute(OSL_GPE_HANDLER,
 630                                          acpi_ev_asynch_execute_gpe_method,
 631                                          gpe_event_info);
 632                 if (ACPI_FAILURE(status)) {
 633                         ACPI_EXCEPTION((AE_INFO, status,
 634                                         "Unable to queue handler for GPE[0x%2X] - event disabled",
 635                                         gpe_number));
 636                 }
 637                 break;
 638
 639         default:
 640
 641                 /*
 642                  * No handler or method to run!
 643                  * 03/2010: This case should no longer be possible. We will not allow
 644                  * a GPE to be enabled if it has no handler or method.
 645                  */
 646                 ACPI_ERROR((AE_INFO,
 647                             "No handler or method for GPE[0x%2X], disabling event",
 648                             gpe_number));
 649
 650                 /*
 651                  * Disable the GPE. The GPE will remain disabled a handler
 652                  * is installed or ACPICA is restarted.
 653                  */
 654                 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
 655                 if (ACPI_FAILURE(status)) {
 656                         ACPI_EXCEPTION((AE_INFO, status,
 657                                         "Unable to disable GPE[0x%2X]",
 658                                         gpe_number));
 659                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 660                 }
 661                 break;
 662         }
 663
 664         return_UINT32(ACPI_INTERRUPT_HANDLED);
 665 }