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/******************************************************************************

 *

 * Module Name: evgpeutil - GPE utilities

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include 

#include "accommon.h"

#include "acevents.h"

#define _COMPONENT          ACPI_EVENTS

ACPI_MODULE_NAME("evgpeutil")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_walk_gpe_list

 *

 * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block

 *              context             - Value passed to callback

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Walk the GPE lists.

 *

 ******************************************************************************/

acpi_status

acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)

{

	struct acpi_gpe_block_info *gpe_block;

	struct acpi_gpe_xrupt_info *gpe_xrupt_info;

	acpi_status status = AE_OK;

	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Walk the interrupt level descriptor list */

	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;

	while (gpe_xrupt_info) {

		/* Walk all Gpe Blocks attached to this interrupt level */

		gpe_block = gpe_xrupt_info->gpe_block_list_head;

		while (gpe_block) {

			/* One callback per GPE block */

			status =

			    gpe_walk_callback(gpe_xrupt_info, gpe_block,

					      context);

			if (ACPI_FAILURE(status)) {

				if (status == AE_CTRL_END) {	/* Callback abort */

					status = AE_OK;

				}

				goto unlock_and_exit;

			}

			gpe_block = gpe_block->next;

		}

		gpe_xrupt_info = gpe_xrupt_info->next;

	}

unlock_and_exit:

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_get_gpe_device

 *

 * PARAMETERS:  GPE_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE

 *              block device. NULL if the GPE is one of the FADT-defined GPEs.

 *

 ******************************************************************************/

acpi_status

acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,

		       struct acpi_gpe_block_info *gpe_block, void *context)

{

	struct acpi_gpe_device_info *info = context;

	/* Increment Index by the number of GPEs in this block */

	info->next_block_base_index += gpe_block->gpe_count;

	if (info->index < info->next_block_base_index) {

		/*

		 * The GPE index is within this block, get the node. Leave the node

		 * NULL for the FADT-defined GPEs

		 */

		if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {

			info->gpe_device = gpe_block->node;

		}

		info->status = AE_OK;

		return (AE_CTRL_END);

	}

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_get_gpe_xrupt_block

 *

 * PARAMETERS:  interrupt_number            - Interrupt for a GPE block

 *              gpe_xrupt_block             - Where the block is returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt

 *              block per unique interrupt level used for GPEs. Should be

 *              called only when the GPE lists are semaphore locked and not

 *              subject to change.

 *

 ******************************************************************************/

acpi_status

acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,

			    struct acpi_gpe_xrupt_info ** gpe_xrupt_block)

{

	struct acpi_gpe_xrupt_info *next_gpe_xrupt;

	struct acpi_gpe_xrupt_info *gpe_xrupt;

	acpi_status status;

	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);

	/* No need for lock since we are not changing any list elements here */

	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;

	while (next_gpe_xrupt) {

		if (next_gpe_xrupt->interrupt_number == interrupt_number) {

			*gpe_xrupt_block = next_gpe_xrupt;

			return_ACPI_STATUS(AE_OK);

		}

		next_gpe_xrupt = next_gpe_xrupt->next;

	}

	/* Not found, must allocate a new xrupt descriptor */

	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));

	if (!gpe_xrupt) {

		return_ACPI_STATUS(AE_NO_MEMORY);

	}

	gpe_xrupt->interrupt_number = interrupt_number;

	/* Install new interrupt descriptor with spin lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	if (acpi_gbl_gpe_xrupt_list_head) {

		next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;

		while (next_gpe_xrupt->next) {

			next_gpe_xrupt = next_gpe_xrupt->next;

		}

		next_gpe_xrupt->next = gpe_xrupt;

		gpe_xrupt->previous = next_gpe_xrupt;

	} else {

		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;

	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Install new interrupt handler if not SCI_INT */

	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {

		status = acpi_os_install_interrupt_handler(interrupt_number,

							   acpi_ev_gpe_xrupt_handler,

							   gpe_xrupt);

		if (ACPI_FAILURE(status)) {

			ACPI_EXCEPTION((AE_INFO, status,

					"Could not install GPE interrupt handler at level 0x%X",

					interrupt_number));

			return_ACPI_STATUS(status);

		}

	}

	*gpe_xrupt_block = gpe_xrupt;

	return_ACPI_STATUS(AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_delete_gpe_xrupt

 *

 * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated

 *              interrupt handler if not the SCI interrupt.

 *

 ******************************************************************************/

acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)

{

	acpi_status status;

	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);

	/* We never want to remove the SCI interrupt handler */

	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {

		gpe_xrupt->gpe_block_list_head = NULL;

		return_ACPI_STATUS(AE_OK);

	}

	/* Disable this interrupt */

	status =

	    acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,

					     acpi_ev_gpe_xrupt_handler);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Unlink the interrupt block with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	if (gpe_xrupt->previous) {

		gpe_xrupt->previous->next = gpe_xrupt->next;

	} else {

		/* No previous, update list head */

		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;

	}

	if (gpe_xrupt->next) {

		gpe_xrupt->next->previous = gpe_xrupt->previous;

	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Free the block */

	ACPI_FREE(gpe_xrupt);

	return_ACPI_STATUS(AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_delete_gpe_handlers

 *

 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info

 *              gpe_block           - Gpe Block info

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.

 *              Used only prior to termination.

 *

 ******************************************************************************/

acpi_status

acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,

			    struct acpi_gpe_block_info *gpe_block,

			    void *context)

{

	struct acpi_gpe_event_info *gpe_event_info;

	struct acpi_gpe_notify_info *notify;

	struct acpi_gpe_notify_info *next;

	u32 i;

	u32 j;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);

	/* Examine each GPE Register within the block */

	for (i = 0; i < gpe_block->register_count; i++) {

		/* Now look at the individual GPEs in this byte register */

		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

			gpe_event_info = &gpe_block->event_info[((acpi_size) i *

								 ACPI_GPE_REGISTER_WIDTH)

								+ j];

			if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==

			     ACPI_GPE_DISPATCH_HANDLER) ||

			    (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==

			     ACPI_GPE_DISPATCH_RAW_HANDLER)) {

				/* Delete an installed handler block */

				ACPI_FREE(gpe_event_info->dispatch.handler);

				gpe_event_info->dispatch.handler = NULL;

				gpe_event_info->flags &=

				    ~ACPI_GPE_DISPATCH_MASK;

			} else if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)

				   == ACPI_GPE_DISPATCH_NOTIFY) {

				/* Delete the implicit notification device list */

				notify = gpe_event_info->dispatch.notify_list;

				while (notify) {

					next = notify->next;

					ACPI_FREE(notify);

					notify = next;

				}

				gpe_event_info->dispatch.notify_list = NULL;

				gpe_event_info->flags &=

				    ~ACPI_GPE_DISPATCH_MASK;

			}

		}

	}

	return_ACPI_STATUS(AE_OK);

}

#endif				/* !ACPI_REDUCED_HARDWARE */