Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 849 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
new file mode 100644
index 000000000..06b9c8dd1
--- /dev/null
+++ b/drivers/acpi/acpica/evgpe.c
@@ -0,0 +1,849 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: evgpe - General Purpose Event handling and dispatch
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acevents.h"
+#include "acnamesp.h"
+
+#define _COMPONENT          ACPI_EVENTS
+ACPI_MODULE_NAME("evgpe")
+#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
+/* Local prototypes */
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
+
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_update_gpe_enable_mask
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to update
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Updates GPE register enable mask based upon whether there are
+ *              runtime references to this GPE
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
+{
+	struct acpi_gpe_register_info *gpe_register_info;
+	u32 register_bit;
+
+	ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
+
+	gpe_register_info = gpe_event_info->register_info;
+	if (!gpe_register_info) {
+		return_ACPI_STATUS(AE_NOT_EXIST);
+	}
+
+	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
+
+	/* Clear the run bit up front */
+
+	ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
+
+	/* Set the mask bit only if there are references to this GPE */
+
+	if (gpe_event_info->runtime_count) {
+		ACPI_SET_BIT(gpe_register_info->enable_for_run,
+			     (u8)register_bit);
+	}
+
+	gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_enable_gpe
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to enable
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Enable a GPE.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_enable_gpe);
+
+	/* Enable the requested GPE */
+
+	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_mask_gpe
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to be blocked/unblocked
+ *              is_masked               - Whether the GPE is masked or not
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked)
+{
+	struct acpi_gpe_register_info *gpe_register_info;
+	u32 register_bit;
+
+	ACPI_FUNCTION_TRACE(ev_mask_gpe);
+
+	gpe_register_info = gpe_event_info->register_info;
+	if (!gpe_register_info) {
+		return_ACPI_STATUS(AE_NOT_EXIST);
+	}
+
+	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
+
+	/* Perform the action */
+
+	if (is_masked) {
+		if (register_bit & gpe_register_info->mask_for_run) {
+			return_ACPI_STATUS(AE_BAD_PARAMETER);
+		}
+
+		(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
+		ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit);
+	} else {
+		if (!(register_bit & gpe_register_info->mask_for_run)) {
+			return_ACPI_STATUS(AE_BAD_PARAMETER);
+		}
+
+		ACPI_CLEAR_BIT(gpe_register_info->mask_for_run,
+			       (u8)register_bit);
+		if (gpe_event_info->runtime_count
+		    && !gpe_event_info->disable_for_dispatch) {
+			(void)acpi_hw_low_set_gpe(gpe_event_info,
+						  ACPI_GPE_ENABLE);
+		}
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_add_gpe_reference
+ *
+ * PARAMETERS:  gpe_event_info          - Add a reference to this GPE
+ *              clear_on_enable         - Clear GPE status before enabling it
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
+ *              hardware-enabled.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info,
+			  u8 clear_on_enable)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(ev_add_gpe_reference);
+
+	if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
+		return_ACPI_STATUS(AE_LIMIT);
+	}
+
+	gpe_event_info->runtime_count++;
+	if (gpe_event_info->runtime_count == 1) {
+
+		/* Enable on first reference */
+
+		if (clear_on_enable) {
+			(void)acpi_hw_clear_gpe(gpe_event_info);
+		}
+
+		status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
+		if (ACPI_SUCCESS(status)) {
+			status = acpi_ev_enable_gpe(gpe_event_info);
+		}
+
+		if (ACPI_FAILURE(status)) {
+			gpe_event_info->runtime_count--;
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_remove_gpe_reference
+ *
+ * PARAMETERS:  gpe_event_info          - Remove a reference to this GPE
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove a reference to a GPE. When the last reference is
+ *              removed, the GPE is hardware-disabled.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);
+
+	if (!gpe_event_info->runtime_count) {
+		return_ACPI_STATUS(AE_LIMIT);
+	}
+
+	gpe_event_info->runtime_count--;
+	if (!gpe_event_info->runtime_count) {
+
+		/* Disable on last reference */
+
+		status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
+		if (ACPI_SUCCESS(status)) {
+			status =
+			    acpi_hw_low_set_gpe(gpe_event_info,
+						ACPI_GPE_DISABLE);
+		}
+
+		if (ACPI_FAILURE(status)) {
+			gpe_event_info->runtime_count++;
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_low_get_gpe_info
+ *
+ * PARAMETERS:  gpe_number          - Raw GPE number
+ *              gpe_block           - A GPE info block
+ *
+ * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
+ *              is not within the specified GPE block)
+ *
+ * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
+ *              the low-level implementation of ev_get_gpe_event_info.
+ *
+ ******************************************************************************/
+
+struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
+						     struct acpi_gpe_block_info
+						     *gpe_block)
+{
+	u32 gpe_index;
+
+	/*
+	 * Validate that the gpe_number is within the specified gpe_block.
+	 * (Two steps)
+	 */
+	if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
+		return (NULL);
+	}
+
+	gpe_index = gpe_number - gpe_block->block_base_number;
+	if (gpe_index >= gpe_block->gpe_count) {
+		return (NULL);
+	}
+
+	return (&gpe_block->event_info[gpe_index]);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_get_gpe_event_info
+ *
+ * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
+ *              gpe_number          - Raw GPE number
+ *
+ * RETURN:      A GPE event_info struct. NULL if not a valid GPE
+ *
+ * DESCRIPTION: Returns the event_info struct associated with this GPE.
+ *              Validates the gpe_block and the gpe_number
+ *
+ *              Should be called only when the GPE lists are semaphore locked
+ *              and not subject to change.
+ *
+ ******************************************************************************/
+
+struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
+						       u32 gpe_number)
+{
+	union acpi_operand_object *obj_desc;
+	struct acpi_gpe_event_info *gpe_info;
+	u32 i;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* A NULL gpe_device means use the FADT-defined GPE block(s) */
+
+	if (!gpe_device) {
+
+		/* Examine GPE Block 0 and 1 (These blocks are permanent) */
+
+		for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
+			gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
+							    acpi_gbl_gpe_fadt_blocks
+							    [i]);
+			if (gpe_info) {
+				return (gpe_info);
+			}
+		}
+
+		/* The gpe_number was not in the range of either FADT GPE block */
+
+		return (NULL);
+	}
+
+	/* A Non-NULL gpe_device means this is a GPE Block Device */
+
+	obj_desc =
+	    acpi_ns_get_attached_object((struct acpi_namespace_node *)
+					       gpe_device);
+	if (!obj_desc || !obj_desc->device.gpe_block) {
+		return (NULL);
+	}
+
+	return (acpi_ev_low_get_gpe_info
+		(gpe_number, obj_desc->device.gpe_block));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_detect
+ *
+ * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
+ *                                    Can have multiple GPE blocks attached.
+ *
+ * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
+ *
+ * DESCRIPTION: Detect if any GP events have occurred. This function is
+ *              executed at interrupt level.
+ *
+ ******************************************************************************/
+
+u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
+{
+	struct acpi_gpe_block_info *gpe_block;
+	struct acpi_namespace_node *gpe_device;
+	struct acpi_gpe_register_info *gpe_register_info;
+	struct acpi_gpe_event_info *gpe_event_info;
+	u32 gpe_number;
+	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
+	acpi_cpu_flags flags;
+	u32 i;
+	u32 j;
+
+	ACPI_FUNCTION_NAME(ev_gpe_detect);
+
+	/* Check for the case where there are no GPEs */
+
+	if (!gpe_xrupt_list) {
+		return (int_status);
+	}
+
+	/*
+	 * We need to obtain the GPE lock for both the data structs and registers
+	 * Note: Not necessary to obtain the hardware lock, since the GPE
+	 * registers are owned by the gpe_lock.
+	 */
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	/* Examine all GPE blocks attached to this interrupt level */
+
+	gpe_block = gpe_xrupt_list->gpe_block_list_head;
+	while (gpe_block) {
+		gpe_device = gpe_block->node;
+
+		/*
+		 * Read all of the 8-bit GPE status and enable registers in this GPE
+		 * block, saving all of them. Find all currently active GP events.
+		 */
+		for (i = 0; i < gpe_block->register_count; i++) {
+
+			/* Get the next status/enable pair */
+
+			gpe_register_info = &gpe_block->register_info[i];
+
+			/*
+			 * Optimization: If there are no GPEs enabled within this
+			 * register, we can safely ignore the entire register.
+			 */
+			if (!(gpe_register_info->enable_for_run |
+			      gpe_register_info->enable_for_wake)) {
+				ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
+						  "Ignore disabled registers for GPE %02X-%02X: "
+						  "RunEnable=%02X, WakeEnable=%02X\n",
+						  gpe_register_info->
+						  base_gpe_number,
+						  gpe_register_info->
+						  base_gpe_number +
+						  (ACPI_GPE_REGISTER_WIDTH - 1),
+						  gpe_register_info->
+						  enable_for_run,
+						  gpe_register_info->
+						  enable_for_wake));
+				continue;
+			}
+
+			/* Now look at the individual GPEs in this byte register */
+
+			for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
+
+				/* Detect and dispatch one GPE bit */
+
+				gpe_event_info =
+				    &gpe_block->
+				    event_info[((acpi_size)i *
+						ACPI_GPE_REGISTER_WIDTH) + j];
+				gpe_number =
+				    j + gpe_register_info->base_gpe_number;
+				acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+				int_status |=
+				    acpi_ev_detect_gpe(gpe_device,
+						       gpe_event_info,
+						       gpe_number);
+				flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+			}
+		}
+
+		gpe_block = gpe_block->next;
+	}
+
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return (int_status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_asynch_execute_gpe_method
+ *
+ * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Perform the actual execution of a GPE control method. This
+ *              function is called from an invocation of acpi_os_execute and
+ *              therefore does NOT execute at interrupt level - so that
+ *              the control method itself is not executed in the context of
+ *              an interrupt handler.
+ *
+ ******************************************************************************/
+
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
+{
+	struct acpi_gpe_event_info *gpe_event_info = context;
+	acpi_status status = AE_OK;
+	struct acpi_evaluate_info *info;
+	struct acpi_gpe_notify_info *notify;
+
+	ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
+
+	/* Do the correct dispatch - normal method or implicit notify */
+
+	switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
+	case ACPI_GPE_DISPATCH_NOTIFY:
+		/*
+		 * Implicit notify.
+		 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
+		 * NOTE: the request is queued for execution after this method
+		 * completes. The notify handlers are NOT invoked synchronously
+		 * from this thread -- because handlers may in turn run other
+		 * control methods.
+		 *
+		 * June 2012: Expand implicit notify mechanism to support
+		 * notifies on multiple device objects.
+		 */
+		notify = gpe_event_info->dispatch.notify_list;
+		while (ACPI_SUCCESS(status) && notify) {
+			status =
+			    acpi_ev_queue_notify_request(notify->device_node,
+							 ACPI_NOTIFY_DEVICE_WAKE);
+
+			notify = notify->next;
+		}
+
+		break;
+
+	case ACPI_GPE_DISPATCH_METHOD:
+
+		/* Allocate the evaluation information block */
+
+		info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+		if (!info) {
+			status = AE_NO_MEMORY;
+		} else {
+			/*
+			 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
+			 * _Lxx/_Exx control method that corresponds to this GPE
+			 */
+			info->prefix_node =
+			    gpe_event_info->dispatch.method_node;
+			info->flags = ACPI_IGNORE_RETURN_VALUE;
+
+			status = acpi_ns_evaluate(info);
+			ACPI_FREE(info);
+		}
+
+		if (ACPI_FAILURE(status)) {
+			ACPI_EXCEPTION((AE_INFO, status,
+					"while evaluating GPE method [%4.4s]",
+					acpi_ut_get_node_name(gpe_event_info->
+							      dispatch.
+							      method_node)));
+		}
+		break;
+
+	default:
+
+		goto error_exit;	/* Should never happen */
+	}
+
+	/* Defer enabling of GPE until all notify handlers are done */
+
+	status = acpi_os_execute(OSL_NOTIFY_HANDLER,
+				 acpi_ev_asynch_enable_gpe, gpe_event_info);
+	if (ACPI_SUCCESS(status)) {
+		return_VOID;
+	}
+
+error_exit:
+	acpi_ev_asynch_enable_gpe(gpe_event_info);
+	return_VOID;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_asynch_enable_gpe
+ *
+ * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
+ *              Callback from acpi_os_execute
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
+ *              complete (i.e., finish execution of Notify)
+ *
+ ******************************************************************************/
+
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)
+{
+	struct acpi_gpe_event_info *gpe_event_info = context;
+	acpi_cpu_flags flags;
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+	(void)acpi_ev_finish_gpe(gpe_event_info);
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+	return;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_finish_gpe
+ *
+ * PARAMETERS:  gpe_event_info      - Info for this GPE
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
+ *              of a GPE method or a synchronous or asynchronous GPE handler.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+	acpi_status status;
+
+	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
+	    ACPI_GPE_LEVEL_TRIGGERED) {
+		/*
+		 * GPE is level-triggered, we clear the GPE status bit after
+		 * handling the event.
+		 */
+		status = acpi_hw_clear_gpe(gpe_event_info);
+		if (ACPI_FAILURE(status)) {
+			return (status);
+		}
+	}
+
+	/*
+	 * Enable this GPE, conditionally. This means that the GPE will
+	 * only be physically enabled if the enable_mask bit is set
+	 * in the event_info.
+	 */
+	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
+	gpe_event_info->disable_for_dispatch = FALSE;
+	return (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_detect_gpe
+ *
+ * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
+ *              gpe_event_info      - Info for this GPE
+ *              gpe_number          - Number relative to the parent GPE block
+ *
+ * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
+ *
+ * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
+ *              (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
+ * NOTE:        GPE is W1C, so it is possible to handle a single GPE from both
+ *              task and irq context in parallel as long as the process to
+ *              detect and mask the GPE is atomic.
+ *              However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is
+ *              dependent on the raw handler itself.
+ *
+ ******************************************************************************/
+
+u32
+acpi_ev_detect_gpe(struct acpi_namespace_node *gpe_device,
+		   struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
+{
+	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
+	u8 enabled_status_byte;
+	u64 status_reg;
+	u64 enable_reg;
+	u32 register_bit;
+	struct acpi_gpe_register_info *gpe_register_info;
+	struct acpi_gpe_handler_info *gpe_handler_info;
+	acpi_cpu_flags flags;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_gpe_detect);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+	if (!gpe_event_info) {
+		gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
+		if (!gpe_event_info)
+			goto error_exit;
+	}
+
+	/* Get the info block for the entire GPE register */
+
+	gpe_register_info = gpe_event_info->register_info;
+
+	/* Get the register bitmask for this GPE */
+
+	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
+
+	/* GPE currently enabled (enable bit == 1)? */
+
+	status = acpi_hw_gpe_read(&enable_reg, &gpe_register_info->enable_address);
+	if (ACPI_FAILURE(status)) {
+		goto error_exit;
+	}
+
+	/* GPE currently active (status bit == 1)? */
+
+	status = acpi_hw_gpe_read(&status_reg, &gpe_register_info->status_address);
+	if (ACPI_FAILURE(status)) {
+		goto error_exit;
+	}
+
+	/* Check if there is anything active at all in this GPE */
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
+			  "Read registers for GPE %02X: Status=%02X, Enable=%02X, "
+			  "RunEnable=%02X, WakeEnable=%02X\n",
+			  gpe_number,
+			  (u32)(status_reg & register_bit),
+			  (u32)(enable_reg & register_bit),
+			  gpe_register_info->enable_for_run,
+			  gpe_register_info->enable_for_wake));
+
+	enabled_status_byte = (u8)(status_reg & enable_reg);
+	if (!(enabled_status_byte & register_bit)) {
+		goto error_exit;
+	}
+
+	/* Invoke global event handler if present */
+
+	acpi_gpe_count++;
+	if (acpi_gbl_global_event_handler) {
+		acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE,
+					      gpe_device, gpe_number,
+					      acpi_gbl_global_event_handler_context);
+	}
+
+	/* Found an active GPE */
+
+	if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
+	    ACPI_GPE_DISPATCH_RAW_HANDLER) {
+
+		/* Dispatch the event to a raw handler */
+
+		gpe_handler_info = gpe_event_info->dispatch.handler;
+
+		/*
+		 * There is no protection around the namespace node
+		 * and the GPE handler to ensure a safe destruction
+		 * because:
+		 * 1. The namespace node is expected to always
+		 *    exist after loading a table.
+		 * 2. The GPE handler is expected to be flushed by
+		 *    acpi_os_wait_events_complete() before the
+		 *    destruction.
+		 */
+		acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+		int_status |=
+		    gpe_handler_info->address(gpe_device, gpe_number,
+					      gpe_handler_info->context);
+		flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+	} else {
+		/* Dispatch the event to a standard handler or method. */
+
+		int_status |= acpi_ev_gpe_dispatch(gpe_device,
+						   gpe_event_info, gpe_number);
+	}
+
+error_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+	return (int_status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_dispatch
+ *
+ * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
+ *              gpe_event_info      - Info for this GPE
+ *              gpe_number          - Number relative to the parent GPE block
+ *
+ * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
+ *
+ * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
+ *              or method (e.g. _Lxx/_Exx) handler.
+ *
+ ******************************************************************************/
+
+u32
+acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,
+		     struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
+{
+	acpi_status status;
+	u32 return_value;
+
+	ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
+
+	/*
+	 * Always disable the GPE so that it does not keep firing before
+	 * any asynchronous activity completes (either from the execution
+	 * of a GPE method or an asynchronous GPE handler.)
+	 *
+	 * If there is no handler or method to run, just disable the
+	 * GPE and leave it disabled permanently to prevent further such
+	 * pointless events from firing.
+	 */
+	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
+	if (ACPI_FAILURE(status)) {
+		ACPI_EXCEPTION((AE_INFO, status,
+				"Unable to disable GPE %02X", gpe_number));
+		return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
+	}
+
+	/*
+	 * If edge-triggered, clear the GPE status bit now. Note that
+	 * level-triggered events are cleared after the GPE is serviced.
+	 */
+	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
+	    ACPI_GPE_EDGE_TRIGGERED) {
+		status = acpi_hw_clear_gpe(gpe_event_info);
+		if (ACPI_FAILURE(status)) {
+			ACPI_EXCEPTION((AE_INFO, status,
+					"Unable to clear GPE %02X",
+					gpe_number));
+			(void)acpi_hw_low_set_gpe(gpe_event_info,
+						  ACPI_GPE_CONDITIONAL_ENABLE);
+			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
+		}
+	}
+
+	gpe_event_info->disable_for_dispatch = TRUE;
+
+	/*
+	 * Dispatch the GPE to either an installed handler or the control
+	 * method associated with this GPE (_Lxx or _Exx). If a handler
+	 * exists, we invoke it and do not attempt to run the method.
+	 * If there is neither a handler nor a method, leave the GPE
+	 * disabled.
+	 */
+	switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
+	case ACPI_GPE_DISPATCH_HANDLER:
+
+		/* Invoke the installed handler (at interrupt level) */
+
+		return_value =
+		    gpe_event_info->dispatch.handler->address(gpe_device,
+							      gpe_number,
+							      gpe_event_info->
+							      dispatch.handler->
+							      context);
+
+		/* If requested, clear (if level-triggered) and re-enable the GPE */
+
+		if (return_value & ACPI_REENABLE_GPE) {
+			(void)acpi_ev_finish_gpe(gpe_event_info);
+		}
+		break;
+
+	case ACPI_GPE_DISPATCH_METHOD:
+	case ACPI_GPE_DISPATCH_NOTIFY:
+		/*
+		 * Execute the method associated with the GPE
+		 * NOTE: Level-triggered GPEs are cleared after the method completes.
+		 */
+		status = acpi_os_execute(OSL_GPE_HANDLER,
+					 acpi_ev_asynch_execute_gpe_method,
+					 gpe_event_info);
+		if (ACPI_FAILURE(status)) {
+			ACPI_EXCEPTION((AE_INFO, status,
+					"Unable to queue handler for GPE %02X - event disabled",
+					gpe_number));
+		}
+		break;
+
+	default:
+		/*
+		 * No handler or method to run!
+		 * 03/2010: This case should no longer be possible. We will not allow
+		 * a GPE to be enabled if it has no handler or method.
+		 */
+		ACPI_ERROR((AE_INFO,
+			    "No handler or method for GPE %02X, disabling event",
+			    gpe_number));
+
+		break;
+	}
+
+	return_UINT32(ACPI_INTERRUPT_HANDLED);
+}
+
+#endif				/* !ACPI_REDUCED_HARDWARE */