1 /******************************************************************************
3 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2018, Intel Corp.
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12 * modification, are permitted provided that the following conditions
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.
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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME ("evgpe")
52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
54 /* Local prototypes */
56 static void ACPI_SYSTEM_XFACE
57 AcpiEvAsynchExecuteGpeMethod (
60 static void ACPI_SYSTEM_XFACE
61 AcpiEvAsynchEnableGpe (
65 /*******************************************************************************
67 * FUNCTION: AcpiEvUpdateGpeEnableMask
69 * PARAMETERS: GpeEventInfo - GPE to update
73 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
74 * runtime references to this GPE
76 ******************************************************************************/
79 AcpiEvUpdateGpeEnableMask (
80 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
82 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
86 ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask
);
89 GpeRegisterInfo
= GpeEventInfo
->RegisterInfo
;
92 return_ACPI_STATUS (AE_NOT_EXIST
);
95 RegisterBit
= AcpiHwGetGpeRegisterBit (GpeEventInfo
);
97 /* Clear the run bit up front */
99 ACPI_CLEAR_BIT (GpeRegisterInfo
->EnableForRun
, RegisterBit
);
101 /* Set the mask bit only if there are references to this GPE */
103 if (GpeEventInfo
->RuntimeCount
)
105 ACPI_SET_BIT (GpeRegisterInfo
->EnableForRun
, (UINT8
) RegisterBit
);
108 GpeRegisterInfo
->EnableMask
= GpeRegisterInfo
->EnableForRun
;
109 return_ACPI_STATUS (AE_OK
);
113 /*******************************************************************************
115 * FUNCTION: AcpiEvEnableGpe
117 * PARAMETERS: GpeEventInfo - GPE to enable
121 * DESCRIPTION: Enable a GPE.
123 ******************************************************************************/
127 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
132 ACPI_FUNCTION_TRACE (EvEnableGpe
);
135 /* Enable the requested GPE */
137 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_ENABLE
);
138 return_ACPI_STATUS (Status
);
142 /*******************************************************************************
144 * FUNCTION: AcpiEvMaskGpe
146 * PARAMETERS: GpeEventInfo - GPE to be blocked/unblocked
147 * IsMasked - Whether the GPE is masked or not
151 * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime.
153 ******************************************************************************/
157 ACPI_GPE_EVENT_INFO
*GpeEventInfo
,
160 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
164 ACPI_FUNCTION_TRACE (EvMaskGpe
);
167 GpeRegisterInfo
= GpeEventInfo
->RegisterInfo
;
168 if (!GpeRegisterInfo
)
170 return_ACPI_STATUS (AE_NOT_EXIST
);
173 RegisterBit
= AcpiHwGetGpeRegisterBit (GpeEventInfo
);
175 /* Perform the action */
179 if (RegisterBit
& GpeRegisterInfo
->MaskForRun
)
181 return_ACPI_STATUS (AE_BAD_PARAMETER
);
184 (void) AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
185 ACPI_SET_BIT (GpeRegisterInfo
->MaskForRun
, (UINT8
) RegisterBit
);
189 if (!(RegisterBit
& GpeRegisterInfo
->MaskForRun
))
191 return_ACPI_STATUS (AE_BAD_PARAMETER
);
194 ACPI_CLEAR_BIT (GpeRegisterInfo
->MaskForRun
, (UINT8
) RegisterBit
);
195 if (GpeEventInfo
->RuntimeCount
&&
196 !GpeEventInfo
->DisableForDispatch
)
198 (void) AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_ENABLE
);
202 return_ACPI_STATUS (AE_OK
);
206 /*******************************************************************************
208 * FUNCTION: AcpiEvAddGpeReference
210 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
214 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
217 ******************************************************************************/
220 AcpiEvAddGpeReference (
221 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
223 ACPI_STATUS Status
= AE_OK
;
226 ACPI_FUNCTION_TRACE (EvAddGpeReference
);
229 if (GpeEventInfo
->RuntimeCount
== ACPI_UINT8_MAX
)
231 return_ACPI_STATUS (AE_LIMIT
);
234 GpeEventInfo
->RuntimeCount
++;
235 if (GpeEventInfo
->RuntimeCount
== 1)
237 /* Enable on first reference */
239 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
240 if (ACPI_SUCCESS (Status
))
242 Status
= AcpiEvEnableGpe (GpeEventInfo
);
245 if (ACPI_FAILURE (Status
))
247 GpeEventInfo
->RuntimeCount
--;
251 return_ACPI_STATUS (Status
);
255 /*******************************************************************************
257 * FUNCTION: AcpiEvRemoveGpeReference
259 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
263 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
264 * removed, the GPE is hardware-disabled.
266 ******************************************************************************/
269 AcpiEvRemoveGpeReference (
270 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
272 ACPI_STATUS Status
= AE_OK
;
275 ACPI_FUNCTION_TRACE (EvRemoveGpeReference
);
278 if (!GpeEventInfo
->RuntimeCount
)
280 return_ACPI_STATUS (AE_LIMIT
);
283 GpeEventInfo
->RuntimeCount
--;
284 if (!GpeEventInfo
->RuntimeCount
)
286 /* Disable on last reference */
288 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
289 if (ACPI_SUCCESS (Status
))
291 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
294 if (ACPI_FAILURE (Status
))
296 GpeEventInfo
->RuntimeCount
++;
300 return_ACPI_STATUS (Status
);
304 /*******************************************************************************
306 * FUNCTION: AcpiEvLowGetGpeInfo
308 * PARAMETERS: GpeNumber - Raw GPE number
309 * GpeBlock - A GPE info block
311 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
312 * is not within the specified GPE block)
314 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
315 * the low-level implementation of EvGetGpeEventInfo.
317 ******************************************************************************/
319 ACPI_GPE_EVENT_INFO
*
320 AcpiEvLowGetGpeInfo (
322 ACPI_GPE_BLOCK_INFO
*GpeBlock
)
328 * Validate that the GpeNumber is within the specified GpeBlock.
332 (GpeNumber
< GpeBlock
->BlockBaseNumber
))
337 GpeIndex
= GpeNumber
- GpeBlock
->BlockBaseNumber
;
338 if (GpeIndex
>= GpeBlock
->GpeCount
)
343 return (&GpeBlock
->EventInfo
[GpeIndex
]);
347 /*******************************************************************************
349 * FUNCTION: AcpiEvGetGpeEventInfo
351 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
352 * GpeNumber - Raw GPE number
354 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
356 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
357 * Validates the GpeBlock and the GpeNumber
359 * Should be called only when the GPE lists are semaphore locked
360 * and not subject to change.
362 ******************************************************************************/
364 ACPI_GPE_EVENT_INFO
*
365 AcpiEvGetGpeEventInfo (
366 ACPI_HANDLE GpeDevice
,
369 ACPI_OPERAND_OBJECT
*ObjDesc
;
370 ACPI_GPE_EVENT_INFO
*GpeInfo
;
374 ACPI_FUNCTION_ENTRY ();
377 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
381 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
383 for (i
= 0; i
< ACPI_MAX_GPE_BLOCKS
; i
++)
385 GpeInfo
= AcpiEvLowGetGpeInfo (GpeNumber
,
386 AcpiGbl_GpeFadtBlocks
[i
]);
393 /* The GpeNumber was not in the range of either FADT GPE block */
398 /* A Non-NULL GpeDevice means this is a GPE Block Device */
400 ObjDesc
= AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE
*) GpeDevice
);
402 !ObjDesc
->Device
.GpeBlock
)
407 return (AcpiEvLowGetGpeInfo (GpeNumber
, ObjDesc
->Device
.GpeBlock
));
411 /*******************************************************************************
413 * FUNCTION: AcpiEvGpeDetect
415 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
416 * Can have multiple GPE blocks attached.
418 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
420 * DESCRIPTION: Detect if any GP events have occurred. This function is
421 * executed at interrupt level.
423 ******************************************************************************/
427 ACPI_GPE_XRUPT_INFO
*GpeXruptList
)
429 ACPI_GPE_BLOCK_INFO
*GpeBlock
;
430 ACPI_NAMESPACE_NODE
*GpeDevice
;
431 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
432 ACPI_GPE_EVENT_INFO
*GpeEventInfo
;
434 UINT32 IntStatus
= ACPI_INTERRUPT_NOT_HANDLED
;
435 ACPI_CPU_FLAGS Flags
;
440 ACPI_FUNCTION_NAME (EvGpeDetect
);
442 /* Check for the case where there are no GPEs */
450 * We need to obtain the GPE lock for both the data structs and registers
451 * Note: Not necessary to obtain the hardware lock, since the GPE
452 * registers are owned by the GpeLock.
454 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
456 /* Examine all GPE blocks attached to this interrupt level */
458 GpeBlock
= GpeXruptList
->GpeBlockListHead
;
461 GpeDevice
= GpeBlock
->Node
;
464 * Read all of the 8-bit GPE status and enable registers in this GPE
465 * block, saving all of them. Find all currently active GP events.
467 for (i
= 0; i
< GpeBlock
->RegisterCount
; i
++)
469 /* Get the next status/enable pair */
471 GpeRegisterInfo
= &GpeBlock
->RegisterInfo
[i
];
474 * Optimization: If there are no GPEs enabled within this
475 * register, we can safely ignore the entire register.
477 if (!(GpeRegisterInfo
->EnableForRun
|
478 GpeRegisterInfo
->EnableForWake
))
480 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
481 "Ignore disabled registers for GPE %02X-%02X: "
482 "RunEnable=%02X, WakeEnable=%02X\n",
483 GpeRegisterInfo
->BaseGpeNumber
,
484 GpeRegisterInfo
->BaseGpeNumber
+ (ACPI_GPE_REGISTER_WIDTH
- 1),
485 GpeRegisterInfo
->EnableForRun
,
486 GpeRegisterInfo
->EnableForWake
));
490 /* Now look at the individual GPEs in this byte register */
492 for (j
= 0; j
< ACPI_GPE_REGISTER_WIDTH
; j
++)
494 /* Detect and dispatch one GPE bit */
496 GpeEventInfo
= &GpeBlock
->EventInfo
[((ACPI_SIZE
) i
*
497 ACPI_GPE_REGISTER_WIDTH
) + j
];
498 GpeNumber
= j
+ GpeRegisterInfo
->BaseGpeNumber
;
499 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
500 IntStatus
|= AcpiEvDetectGpe (
501 GpeDevice
, GpeEventInfo
, GpeNumber
);
502 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
506 GpeBlock
= GpeBlock
->Next
;
509 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
514 /*******************************************************************************
516 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
518 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
522 * DESCRIPTION: Perform the actual execution of a GPE control method. This
523 * function is called from an invocation of AcpiOsExecute and
524 * therefore does NOT execute at interrupt level - so that
525 * the control method itself is not executed in the context of
526 * an interrupt handler.
528 ******************************************************************************/
530 static void ACPI_SYSTEM_XFACE
531 AcpiEvAsynchExecuteGpeMethod (
534 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
535 ACPI_STATUS Status
= AE_OK
;
536 ACPI_EVALUATE_INFO
*Info
;
537 ACPI_GPE_NOTIFY_INFO
*Notify
;
540 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod
);
543 /* Do the correct dispatch - normal method or implicit notify */
545 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
))
547 case ACPI_GPE_DISPATCH_NOTIFY
:
550 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
551 * NOTE: the request is queued for execution after this method
552 * completes. The notify handlers are NOT invoked synchronously
553 * from this thread -- because handlers may in turn run other
556 * June 2012: Expand implicit notify mechanism to support
557 * notifies on multiple device objects.
559 Notify
= GpeEventInfo
->Dispatch
.NotifyList
;
560 while (ACPI_SUCCESS (Status
) && Notify
)
562 Status
= AcpiEvQueueNotifyRequest (
563 Notify
->DeviceNode
, ACPI_NOTIFY_DEVICE_WAKE
);
565 Notify
= Notify
->Next
;
569 case ACPI_GPE_DISPATCH_METHOD
:
571 /* Allocate the evaluation information block */
573 Info
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO
));
576 Status
= AE_NO_MEMORY
;
581 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
582 * _Lxx/_Exx control method that corresponds to this GPE
584 Info
->PrefixNode
= GpeEventInfo
->Dispatch
.MethodNode
;
585 Info
->Flags
= ACPI_IGNORE_RETURN_VALUE
;
587 Status
= AcpiNsEvaluate (Info
);
591 if (ACPI_FAILURE (Status
))
593 ACPI_EXCEPTION ((AE_INFO
, Status
,
594 "while evaluating GPE method [%4.4s]",
595 AcpiUtGetNodeName (GpeEventInfo
->Dispatch
.MethodNode
)));
601 goto ErrorExit
; /* Should never happen */
604 /* Defer enabling of GPE until all notify handlers are done */
606 Status
= AcpiOsExecute (OSL_NOTIFY_HANDLER
,
607 AcpiEvAsynchEnableGpe
, GpeEventInfo
);
608 if (ACPI_SUCCESS (Status
))
614 AcpiEvAsynchEnableGpe (GpeEventInfo
);
619 /*******************************************************************************
621 * FUNCTION: AcpiEvAsynchEnableGpe
623 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
624 * Callback from AcpiOsExecute
628 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
629 * complete (i.e., finish execution of Notify)
631 ******************************************************************************/
633 static void ACPI_SYSTEM_XFACE
634 AcpiEvAsynchEnableGpe (
637 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
638 ACPI_CPU_FLAGS Flags
;
641 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
642 (void) AcpiEvFinishGpe (GpeEventInfo
);
643 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
649 /*******************************************************************************
651 * FUNCTION: AcpiEvFinishGpe
653 * PARAMETERS: GpeEventInfo - Info for this GPE
657 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
658 * of a GPE method or a synchronous or asynchronous GPE handler.
660 ******************************************************************************/
664 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
669 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
670 ACPI_GPE_LEVEL_TRIGGERED
)
673 * GPE is level-triggered, we clear the GPE status bit after
674 * handling the event.
676 Status
= AcpiHwClearGpe (GpeEventInfo
);
677 if (ACPI_FAILURE (Status
))
684 * Enable this GPE, conditionally. This means that the GPE will
685 * only be physically enabled if the EnableMask bit is set
688 (void) AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_CONDITIONAL_ENABLE
);
689 GpeEventInfo
->DisableForDispatch
= FALSE
;
694 /*******************************************************************************
696 * FUNCTION: AcpiEvDetectGpe
698 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
699 * GpeEventInfo - Info for this GPE
700 * GpeNumber - Number relative to the parent GPE block
702 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
704 * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
705 * (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
706 * NOTE: GPE is W1C, so it is possible to handle a single GPE from both
707 * task and irq context in parallel as long as the process to
708 * detect and mask the GPE is atomic.
709 * However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is
710 * dependent on the raw handler itself.
712 ******************************************************************************/
716 ACPI_NAMESPACE_NODE
*GpeDevice
,
717 ACPI_GPE_EVENT_INFO
*GpeEventInfo
,
720 UINT32 IntStatus
= ACPI_INTERRUPT_NOT_HANDLED
;
721 UINT8 EnabledStatusByte
;
725 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
726 ACPI_GPE_HANDLER_INFO
*GpeHandlerInfo
;
727 ACPI_CPU_FLAGS Flags
;
731 ACPI_FUNCTION_TRACE (EvGpeDetect
);
734 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
736 /* Get the info block for the entire GPE register */
738 GpeRegisterInfo
= GpeEventInfo
->RegisterInfo
;
740 /* Get the register bitmask for this GPE */
742 RegisterBit
= AcpiHwGetGpeRegisterBit (GpeEventInfo
);
744 /* GPE currently enabled (enable bit == 1)? */
746 Status
= AcpiHwRead (&EnableReg
, &GpeRegisterInfo
->EnableAddress
);
747 if (ACPI_FAILURE (Status
))
752 /* GPE currently active (status bit == 1)? */
754 Status
= AcpiHwRead (&StatusReg
, &GpeRegisterInfo
->StatusAddress
);
755 if (ACPI_FAILURE (Status
))
760 /* Check if there is anything active at all in this GPE */
762 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
763 "Read registers for GPE %02X: Status=%02X, Enable=%02X, "
764 "RunEnable=%02X, WakeEnable=%02X\n",
766 (UINT32
) (StatusReg
& RegisterBit
),
767 (UINT32
) (EnableReg
& RegisterBit
),
768 GpeRegisterInfo
->EnableForRun
,
769 GpeRegisterInfo
->EnableForWake
));
771 EnabledStatusByte
= (UINT8
) (StatusReg
& EnableReg
);
772 if (!(EnabledStatusByte
& RegisterBit
))
777 /* Invoke global event handler if present */
780 if (AcpiGbl_GlobalEventHandler
)
782 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE
,
783 GpeDevice
, GpeNumber
,
784 AcpiGbl_GlobalEventHandlerContext
);
787 /* Found an active GPE */
789 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
) ==
790 ACPI_GPE_DISPATCH_RAW_HANDLER
)
792 /* Dispatch the event to a raw handler */
794 GpeHandlerInfo
= GpeEventInfo
->Dispatch
.Handler
;
797 * There is no protection around the namespace node
798 * and the GPE handler to ensure a safe destruction
800 * 1. The namespace node is expected to always
801 * exist after loading a table.
802 * 2. The GPE handler is expected to be flushed by
803 * AcpiOsWaitEventsComplete() before the
806 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
807 IntStatus
|= GpeHandlerInfo
->Address (
808 GpeDevice
, GpeNumber
, GpeHandlerInfo
->Context
);
809 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
813 /* Dispatch the event to a standard handler or method. */
815 IntStatus
|= AcpiEvGpeDispatch (GpeDevice
,
816 GpeEventInfo
, GpeNumber
);
820 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
825 /*******************************************************************************
827 * FUNCTION: AcpiEvGpeDispatch
829 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
830 * GpeEventInfo - Info for this GPE
831 * GpeNumber - Number relative to the parent GPE block
833 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
835 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
836 * or method (e.g. _Lxx/_Exx) handler.
838 ******************************************************************************/
842 ACPI_NAMESPACE_NODE
*GpeDevice
,
843 ACPI_GPE_EVENT_INFO
*GpeEventInfo
,
850 ACPI_FUNCTION_TRACE (EvGpeDispatch
);
854 * Always disable the GPE so that it does not keep firing before
855 * any asynchronous activity completes (either from the execution
856 * of a GPE method or an asynchronous GPE handler.)
858 * If there is no handler or method to run, just disable the
859 * GPE and leave it disabled permanently to prevent further such
860 * pointless events from firing.
862 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
863 if (ACPI_FAILURE (Status
))
865 ACPI_EXCEPTION ((AE_INFO
, Status
,
866 "Unable to disable GPE %02X", GpeNumber
));
867 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
871 * If edge-triggered, clear the GPE status bit now. Note that
872 * level-triggered events are cleared after the GPE is serviced.
874 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
875 ACPI_GPE_EDGE_TRIGGERED
)
877 Status
= AcpiHwClearGpe (GpeEventInfo
);
878 if (ACPI_FAILURE (Status
))
880 ACPI_EXCEPTION ((AE_INFO
, Status
,
881 "Unable to clear GPE %02X", GpeNumber
));
882 (void) AcpiHwLowSetGpe (
883 GpeEventInfo
, ACPI_GPE_CONDITIONAL_ENABLE
);
884 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
888 GpeEventInfo
->DisableForDispatch
= TRUE
;
891 * Dispatch the GPE to either an installed handler or the control
892 * method associated with this GPE (_Lxx or _Exx). If a handler
893 * exists, we invoke it and do not attempt to run the method.
894 * If there is neither a handler nor a method, leave the GPE
897 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
))
899 case ACPI_GPE_DISPATCH_HANDLER
:
901 /* Invoke the installed handler (at interrupt level) */
903 ReturnValue
= GpeEventInfo
->Dispatch
.Handler
->Address (
904 GpeDevice
, GpeNumber
,
905 GpeEventInfo
->Dispatch
.Handler
->Context
);
907 /* If requested, clear (if level-triggered) and reenable the GPE */
909 if (ReturnValue
& ACPI_REENABLE_GPE
)
911 (void) AcpiEvFinishGpe (GpeEventInfo
);
915 case ACPI_GPE_DISPATCH_METHOD
:
916 case ACPI_GPE_DISPATCH_NOTIFY
:
918 * Execute the method associated with the GPE
919 * NOTE: Level-triggered GPEs are cleared after the method completes.
921 Status
= AcpiOsExecute (OSL_GPE_HANDLER
,
922 AcpiEvAsynchExecuteGpeMethod
, GpeEventInfo
);
923 if (ACPI_FAILURE (Status
))
925 ACPI_EXCEPTION ((AE_INFO
, Status
,
926 "Unable to queue handler for GPE %02X - event disabled",
933 * No handler or method to run!
934 * 03/2010: This case should no longer be possible. We will not allow
935 * a GPE to be enabled if it has no handler or method.
937 ACPI_ERROR ((AE_INFO
,
938 "No handler or method for GPE %02X, disabling event",
943 return_UINT32 (ACPI_INTERRUPT_HANDLED
);
946 #endif /* !ACPI_REDUCED_HARDWARE */