1 /******************************************************************************
3 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2012, Intel Corp.
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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, GpeRegisterInfo);
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 return_ACPI_STATUS (AE_OK);
112 /*******************************************************************************
114 * FUNCTION: AcpiEvEnableGpe
116 * PARAMETERS: GpeEventInfo - GPE to enable
120 * DESCRIPTION: Clear a GPE of stale events and enable it.
122 ******************************************************************************/
126 ACPI_GPE_EVENT_INFO *GpeEventInfo)
131 ACPI_FUNCTION_TRACE (EvEnableGpe);
135 * We will only allow a GPE to be enabled if it has either an associated
136 * method (_Lxx/_Exx) or a handler, or is using the implicit notify
137 * feature. Otherwise, the GPE will be immediately disabled by
138 * AcpiEvGpeDispatch the first time it fires.
140 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
141 ACPI_GPE_DISPATCH_NONE)
143 return_ACPI_STATUS (AE_NO_HANDLER);
146 /* Clear the GPE (of stale events) */
148 Status = AcpiHwClearGpe (GpeEventInfo);
149 if (ACPI_FAILURE (Status))
151 return_ACPI_STATUS (Status);
154 /* Enable the requested GPE */
156 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
157 return_ACPI_STATUS (Status);
161 /*******************************************************************************
163 * FUNCTION: AcpiEvAddGpeReference
165 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
169 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
172 ******************************************************************************/
175 AcpiEvAddGpeReference (
176 ACPI_GPE_EVENT_INFO *GpeEventInfo)
178 ACPI_STATUS Status = AE_OK;
181 ACPI_FUNCTION_TRACE (EvAddGpeReference);
184 if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
186 return_ACPI_STATUS (AE_LIMIT);
189 GpeEventInfo->RuntimeCount++;
190 if (GpeEventInfo->RuntimeCount == 1)
192 /* Enable on first reference */
194 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
195 if (ACPI_SUCCESS (Status))
197 Status = AcpiEvEnableGpe (GpeEventInfo);
200 if (ACPI_FAILURE (Status))
202 GpeEventInfo->RuntimeCount--;
206 return_ACPI_STATUS (Status);
210 /*******************************************************************************
212 * FUNCTION: AcpiEvRemoveGpeReference
214 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
218 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
219 * removed, the GPE is hardware-disabled.
221 ******************************************************************************/
224 AcpiEvRemoveGpeReference (
225 ACPI_GPE_EVENT_INFO *GpeEventInfo)
227 ACPI_STATUS Status = AE_OK;
230 ACPI_FUNCTION_TRACE (EvRemoveGpeReference);
233 if (!GpeEventInfo->RuntimeCount)
235 return_ACPI_STATUS (AE_LIMIT);
238 GpeEventInfo->RuntimeCount--;
239 if (!GpeEventInfo->RuntimeCount)
241 /* Disable on last reference */
243 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
244 if (ACPI_SUCCESS (Status))
246 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
249 if (ACPI_FAILURE (Status))
251 GpeEventInfo->RuntimeCount++;
255 return_ACPI_STATUS (Status);
259 /*******************************************************************************
261 * FUNCTION: AcpiEvLowGetGpeInfo
263 * PARAMETERS: GpeNumber - Raw GPE number
264 * GpeBlock - A GPE info block
266 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
267 * is not within the specified GPE block)
269 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
270 * the low-level implementation of EvGetGpeEventInfo.
272 ******************************************************************************/
274 ACPI_GPE_EVENT_INFO *
275 AcpiEvLowGetGpeInfo (
277 ACPI_GPE_BLOCK_INFO *GpeBlock)
283 * Validate that the GpeNumber is within the specified GpeBlock.
287 (GpeNumber < GpeBlock->BlockBaseNumber))
292 GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber;
293 if (GpeIndex >= GpeBlock->GpeCount)
298 return (&GpeBlock->EventInfo[GpeIndex]);
302 /*******************************************************************************
304 * FUNCTION: AcpiEvGetGpeEventInfo
306 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
307 * GpeNumber - Raw GPE number
309 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
311 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
312 * Validates the GpeBlock and the GpeNumber
314 * Should be called only when the GPE lists are semaphore locked
315 * and not subject to change.
317 ******************************************************************************/
319 ACPI_GPE_EVENT_INFO *
320 AcpiEvGetGpeEventInfo (
321 ACPI_HANDLE GpeDevice,
324 ACPI_OPERAND_OBJECT *ObjDesc;
325 ACPI_GPE_EVENT_INFO *GpeInfo;
329 ACPI_FUNCTION_ENTRY ();
332 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
336 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
338 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
340 GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber,
341 AcpiGbl_GpeFadtBlocks[i]);
348 /* The GpeNumber was not in the range of either FADT GPE block */
353 /* A Non-NULL GpeDevice means this is a GPE Block Device */
355 ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
357 !ObjDesc->Device.GpeBlock)
362 return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock));
366 /*******************************************************************************
368 * FUNCTION: AcpiEvGpeDetect
370 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
371 * Can have multiple GPE blocks attached.
373 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
375 * DESCRIPTION: Detect if any GP events have occurred. This function is
376 * executed at interrupt level.
378 ******************************************************************************/
382 ACPI_GPE_XRUPT_INFO *GpeXruptList)
385 ACPI_GPE_BLOCK_INFO *GpeBlock;
386 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
387 UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
388 UINT8 EnabledStatusByte;
391 ACPI_CPU_FLAGS Flags;
396 ACPI_FUNCTION_NAME (EvGpeDetect);
398 /* Check for the case where there are no GPEs */
406 * We need to obtain the GPE lock for both the data structs and registers
407 * Note: Not necessary to obtain the hardware lock, since the GPE
408 * registers are owned by the GpeLock.
410 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
412 /* Examine all GPE blocks attached to this interrupt level */
414 GpeBlock = GpeXruptList->GpeBlockListHead;
418 * Read all of the 8-bit GPE status and enable registers in this GPE
419 * block, saving all of them. Find all currently active GP events.
421 for (i = 0; i < GpeBlock->RegisterCount; i++)
423 /* Get the next status/enable pair */
425 GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
428 * Optimization: If there are no GPEs enabled within this
429 * register, we can safely ignore the entire register.
431 if (!(GpeRegisterInfo->EnableForRun |
432 GpeRegisterInfo->EnableForWake))
437 /* Read the Status Register */
439 Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
440 if (ACPI_FAILURE (Status))
445 /* Read the Enable Register */
447 Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
448 if (ACPI_FAILURE (Status))
453 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
454 "Read GPE Register at GPE%02X: Status=%02X, Enable=%02X\n",
455 GpeRegisterInfo->BaseGpeNumber, StatusReg, EnableReg));
457 /* Check if there is anything active at all in this register */
459 EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
460 if (!EnabledStatusByte)
462 /* No active GPEs in this register, move on */
467 /* Now look at the individual GPEs in this byte register */
469 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
471 /* Examine one GPE bit */
473 if (EnabledStatusByte & (1 << j))
476 * Found an active GPE. Dispatch the event to a handler
479 IntStatus |= AcpiEvGpeDispatch (GpeBlock->Node,
480 &GpeBlock->EventInfo[((ACPI_SIZE) i *
481 ACPI_GPE_REGISTER_WIDTH) + j],
482 j + GpeRegisterInfo->BaseGpeNumber);
487 GpeBlock = GpeBlock->Next;
492 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
497 /*******************************************************************************
499 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
501 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
505 * DESCRIPTION: Perform the actual execution of a GPE control method. This
506 * function is called from an invocation of AcpiOsExecute and
507 * therefore does NOT execute at interrupt level - so that
508 * the control method itself is not executed in the context of
509 * an interrupt handler.
511 ******************************************************************************/
513 static void ACPI_SYSTEM_XFACE
514 AcpiEvAsynchExecuteGpeMethod (
517 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
519 ACPI_GPE_EVENT_INFO *LocalGpeEventInfo;
520 ACPI_EVALUATE_INFO *Info;
521 ACPI_GPE_NOTIFY_INFO *Notify;
524 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
527 /* Allocate a local GPE block */
529 LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO));
530 if (!LocalGpeEventInfo)
532 ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY,
533 "while handling a GPE"));
537 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
538 if (ACPI_FAILURE (Status))
543 /* Must revalidate the GpeNumber/GpeBlock */
545 if (!AcpiEvValidGpeEvent (GpeEventInfo))
547 Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
552 * Take a snapshot of the GPE info for this level - we copy the info to
553 * prevent a race condition with RemoveHandler/RemoveBlock.
555 ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo,
556 sizeof (ACPI_GPE_EVENT_INFO));
558 Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
559 if (ACPI_FAILURE (Status))
564 /* Do the correct dispatch - normal method or implicit notify */
566 switch (LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
568 case ACPI_GPE_DISPATCH_NOTIFY:
572 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
573 * NOTE: the request is queued for execution after this method
574 * completes. The notify handlers are NOT invoked synchronously
575 * from this thread -- because handlers may in turn run other
578 * June 2012: Expand implicit notify mechanism to support
579 * notifies on multiple device objects.
581 Notify = LocalGpeEventInfo->Dispatch.NotifyList;
582 while (ACPI_SUCCESS (Status) && Notify)
584 Status = AcpiEvQueueNotifyRequest (Notify->DeviceNode,
585 ACPI_NOTIFY_DEVICE_WAKE);
587 Notify = Notify->Next;
591 case ACPI_GPE_DISPATCH_METHOD:
593 /* Allocate the evaluation information block */
595 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
598 Status = AE_NO_MEMORY;
603 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
604 * _Lxx/_Exx control method that corresponds to this GPE
606 Info->PrefixNode = LocalGpeEventInfo->Dispatch.MethodNode;
607 Info->Flags = ACPI_IGNORE_RETURN_VALUE;
609 Status = AcpiNsEvaluate (Info);
613 if (ACPI_FAILURE (Status))
615 ACPI_EXCEPTION ((AE_INFO, Status,
616 "while evaluating GPE method [%4.4s]",
617 AcpiUtGetNodeName (LocalGpeEventInfo->Dispatch.MethodNode)));
623 return_VOID; /* Should never happen */
626 /* Defer enabling of GPE until all notify handlers are done */
628 Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
629 AcpiEvAsynchEnableGpe, LocalGpeEventInfo);
630 if (ACPI_FAILURE (Status))
632 ACPI_FREE (LocalGpeEventInfo);
638 /*******************************************************************************
640 * FUNCTION: AcpiEvAsynchEnableGpe
642 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
643 * Callback from AcpiOsExecute
647 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
648 * complete (i.e., finish execution of Notify)
650 ******************************************************************************/
652 static void ACPI_SYSTEM_XFACE
653 AcpiEvAsynchEnableGpe (
656 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
659 (void) AcpiEvFinishGpe (GpeEventInfo);
661 ACPI_FREE (GpeEventInfo);
666 /*******************************************************************************
668 * FUNCTION: AcpiEvFinishGpe
670 * PARAMETERS: GpeEventInfo - Info for this GPE
674 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
675 * of a GPE method or a synchronous or asynchronous GPE handler.
677 ******************************************************************************/
681 ACPI_GPE_EVENT_INFO *GpeEventInfo)
686 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
687 ACPI_GPE_LEVEL_TRIGGERED)
690 * GPE is level-triggered, we clear the GPE status bit after
691 * handling the event.
693 Status = AcpiHwClearGpe (GpeEventInfo);
694 if (ACPI_FAILURE (Status))
701 * Enable this GPE, conditionally. This means that the GPE will
702 * only be physically enabled if the EnableForRun bit is set
705 (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
710 /*******************************************************************************
712 * FUNCTION: AcpiEvGpeDispatch
714 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
715 * GpeEventInfo - Info for this GPE
716 * GpeNumber - Number relative to the parent GPE block
718 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
720 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
721 * or method (e.g. _Lxx/_Exx) handler.
723 * This function executes at interrupt level.
725 ******************************************************************************/
729 ACPI_NAMESPACE_NODE *GpeDevice,
730 ACPI_GPE_EVENT_INFO *GpeEventInfo,
737 ACPI_FUNCTION_TRACE (EvGpeDispatch);
740 /* Invoke global event handler if present */
743 if (AcpiGbl_GlobalEventHandler)
745 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice,
746 GpeNumber, AcpiGbl_GlobalEventHandlerContext);
750 * If edge-triggered, clear the GPE status bit now. Note that
751 * level-triggered events are cleared after the GPE is serviced.
753 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
754 ACPI_GPE_EDGE_TRIGGERED)
756 Status = AcpiHwClearGpe (GpeEventInfo);
757 if (ACPI_FAILURE (Status))
759 ACPI_EXCEPTION ((AE_INFO, Status,
760 "Unable to clear GPE%02X", GpeNumber));
761 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
766 * Always disable the GPE so that it does not keep firing before
767 * any asynchronous activity completes (either from the execution
768 * of a GPE method or an asynchronous GPE handler.)
770 * If there is no handler or method to run, just disable the
771 * GPE and leave it disabled permanently to prevent further such
772 * pointless events from firing.
774 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
775 if (ACPI_FAILURE (Status))
777 ACPI_EXCEPTION ((AE_INFO, Status,
778 "Unable to disable GPE%02X", GpeNumber));
779 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
783 * Dispatch the GPE to either an installed handler or the control
784 * method associated with this GPE (_Lxx or _Exx). If a handler
785 * exists, we invoke it and do not attempt to run the method.
786 * If there is neither a handler nor a method, leave the GPE
789 switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
791 case ACPI_GPE_DISPATCH_HANDLER:
793 /* Invoke the installed handler (at interrupt level) */
795 ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
796 GpeDevice, GpeNumber,
797 GpeEventInfo->Dispatch.Handler->Context);
799 /* If requested, clear (if level-triggered) and reenable the GPE */
801 if (ReturnValue & ACPI_REENABLE_GPE)
803 (void) AcpiEvFinishGpe (GpeEventInfo);
807 case ACPI_GPE_DISPATCH_METHOD:
808 case ACPI_GPE_DISPATCH_NOTIFY:
811 * Execute the method associated with the GPE
812 * NOTE: Level-triggered GPEs are cleared after the method completes.
814 Status = AcpiOsExecute (OSL_GPE_HANDLER,
815 AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
816 if (ACPI_FAILURE (Status))
818 ACPI_EXCEPTION ((AE_INFO, Status,
819 "Unable to queue handler for GPE%02X - event disabled",
827 * No handler or method to run!
828 * 03/2010: This case should no longer be possible. We will not allow
829 * a GPE to be enabled if it has no handler or method.
831 ACPI_ERROR ((AE_INFO,
832 "No handler or method for GPE%02X, disabling event",
837 return_UINT32 (ACPI_INTERRUPT_HANDLED);
840 #endif /* !ACPI_REDUCED_HARDWARE */