[linux-2.6-block.git] / drivers / acpi / acpica / evgpeutil.c

/******************************************************************************
 *
 * Module Name: evgpeutil - GPE utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, 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 <acpi/acpi.h>
#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_valid_gpe_event
 *
 * PARAMETERS:  gpe_event_info              - Info for this GPE
 *
 * RETURN:      TRUE if the gpe_event is valid
 *
 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
{
	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
	struct acpi_gpe_block_info *gpe_block;

	ACPI_FUNCTION_ENTRY();

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

	/* Walk the GPE interrupt levels */

	gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
	while (gpe_xrupt_block) {
		gpe_block = gpe_xrupt_block->gpe_block_list_head;

		/* Walk the GPE blocks on this interrupt level */

		while (gpe_block) {
			if ((&gpe_block->event_info[0] <= gpe_event_info) &&
			    (&gpe_block->event_info[gpe_block->gpe_count] >
			     gpe_event_info)) {
				return (TRUE);
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_block = gpe_xrupt_block->next;
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * 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 ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
			    ACPI_GPE_DISPATCH_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 ((gpe_event_info->
				 flags & ACPI_GPE_DISPATCH_MASK) ==
				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 */
Commit	Line	Data
3fe50208 BM	1	/******************************************************************************
	2	*
	3	* Module Name: evgpeutil - GPE utilities
	4	*
	5	*****************************************************************************/
	6
	7	/*
25f044e6	8	* Copyright (C) 2000 - 2013, Intel Corp.
3fe50208 BM	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
	48	#define _COMPONENT ACPI_EVENTS
	49	ACPI_MODULE_NAME("evgpeutil")
	50
33620c54	51	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
3fe50208 BM	52	/*******************************************************************************
	53	*
	54	* FUNCTION: acpi_ev_walk_gpe_list
	55	*
	56	* PARAMETERS: gpe_walk_callback - Routine called for each GPE block
ba494bee	57	* context - Value passed to callback
3fe50208 BM	58	*
	59	* RETURN: Status
	60	*
	61	* DESCRIPTION: Walk the GPE lists.
	62	*
	63	******************************************************************************/
	64	acpi_status
	65	acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
	66	{
	67	struct acpi_gpe_block_info *gpe_block;
	68	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	69	acpi_status status = AE_OK;
	70	acpi_cpu_flags flags;
	71
	72	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
	73
	74	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	75
	76	/* Walk the interrupt level descriptor list */
	77
	78	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	79	while (gpe_xrupt_info) {
	80
	81	/* Walk all Gpe Blocks attached to this interrupt level */
	82
	83	gpe_block = gpe_xrupt_info->gpe_block_list_head;
	84	while (gpe_block) {
	85
	86	/* One callback per GPE block */
	87
	88	status =
	89	gpe_walk_callback(gpe_xrupt_info, gpe_block,
	90	context);
	91	if (ACPI_FAILURE(status)) {
	92	if (status == AE_CTRL_END) { /* Callback abort */
	93	status = AE_OK;
	94	}
	95	goto unlock_and_exit;
	96	}
	97
	98	gpe_block = gpe_block->next;
	99	}
	100
	101	gpe_xrupt_info = gpe_xrupt_info->next;
	102	}
	103
10622bf8	104	unlock_and_exit:
3fe50208 BM	105	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	106	return_ACPI_STATUS(status);
	107	}
	108
	109	/*******************************************************************************
	110	*
	111	* FUNCTION: acpi_ev_valid_gpe_event
	112	*
	113	* PARAMETERS: gpe_event_info - Info for this GPE
	114	*
	115	* RETURN: TRUE if the gpe_event is valid
	116	*
	117	* DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
	118	* Should be called only when the GPE lists are semaphore locked
	119	* and not subject to change.
	120	*
	121	******************************************************************************/
	122
	123	u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
	124	{
	125	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
	126	struct acpi_gpe_block_info *gpe_block;
	127
	128	ACPI_FUNCTION_ENTRY();
	129
	130	/* No need for spin lock since we are not changing any list elements */
	131
	132	/* Walk the GPE interrupt levels */
	133
	134	gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
	135	while (gpe_xrupt_block) {
	136	gpe_block = gpe_xrupt_block->gpe_block_list_head;
	137
	138	/* Walk the GPE blocks on this interrupt level */
	139
	140	while (gpe_block) {
	141	if ((&gpe_block->event_info[0] <= gpe_event_info) &&
	142	(&gpe_block->event_info[gpe_block->gpe_count] >
	143	gpe_event_info)) {
	144	return (TRUE);
	145	}
	146
	147	gpe_block = gpe_block->next;
	148	}
	149
	150	gpe_xrupt_block = gpe_xrupt_block->next;
	151	}
	152
	153	return (FALSE);
	154	}
	155
3cfd53d5 LM	156	/*******************************************************************************
	157	*
	158	* FUNCTION: acpi_ev_get_gpe_device
	159	*
	160	* PARAMETERS: GPE_WALK_CALLBACK
	161	*
	162	* RETURN: Status
	163	*
	164	* DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
	165	* block device. NULL if the GPE is one of the FADT-defined GPEs.
	166	*
	167	******************************************************************************/
	168
	169	acpi_status
	170	acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
	171	struct acpi_gpe_block_info gpe_block, void context)
	172	{
	173	struct acpi_gpe_device_info *info = context;
	174
	175	/* Increment Index by the number of GPEs in this block */
	176
	177	info->next_block_base_index += gpe_block->gpe_count;
	178
	179	if (info->index < info->next_block_base_index) {
	180	/*
	181	* The GPE index is within this block, get the node. Leave the node
	182	* NULL for the FADT-defined GPEs
	183	*/
	184	if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
	185	info->gpe_device = gpe_block->node;
	186	}
	187
	188	info->status = AE_OK;
	189	return (AE_CTRL_END);
	190	}
	191
	192	return (AE_OK);
	193	}
	194
3fe50208 BM	195	/*******************************************************************************
	196	*
	197	* FUNCTION: acpi_ev_get_gpe_xrupt_block
	198	*
a2fd4b4b	199	* PARAMETERS: interrupt_number - Interrupt for a GPE block
4bec3d80	200	* gpe_xrupt_block - Where the block is returned
3fe50208	201	*
4bec3d80	202	* RETURN: Status
3fe50208 BM	203	*
	204	* DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
	205	* block per unique interrupt level used for GPEs. Should be
	206	* called only when the GPE lists are semaphore locked and not
	207	* subject to change.
	208	*
	209	******************************************************************************/
	210
4bec3d80 BM	211	acpi_status
	212	acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,
	213	struct acpi_gpe_xrupt_info ** gpe_xrupt_block)
3fe50208 BM	214	{
	215	struct acpi_gpe_xrupt_info *next_gpe_xrupt;
	216	struct acpi_gpe_xrupt_info *gpe_xrupt;
	217	acpi_status status;
	218	acpi_cpu_flags flags;
	219
	220	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
	221
	222	/* No need for lock since we are not changing any list elements here */
	223
	224	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	225	while (next_gpe_xrupt) {
	226	if (next_gpe_xrupt->interrupt_number == interrupt_number) {
4bec3d80 BM	227	*gpe_xrupt_block = next_gpe_xrupt;
4bec3d80 BM	228	return_ACPI_STATUS(AE_OK);
3fe50208 BM	229	}
	230
	231	next_gpe_xrupt = next_gpe_xrupt->next;
	232	}
	233
	234	/* Not found, must allocate a new xrupt descriptor */
	235
	236	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
	237	if (!gpe_xrupt) {
4bec3d80	238	return_ACPI_STATUS(AE_NO_MEMORY);
3fe50208 BM	239	}
	240
	241	gpe_xrupt->interrupt_number = interrupt_number;
	242
	243	/* Install new interrupt descriptor with spin lock */
	244
	245	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	246	if (acpi_gbl_gpe_xrupt_list_head) {
	247	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	248	while (next_gpe_xrupt->next) {
	249	next_gpe_xrupt = next_gpe_xrupt->next;
	250	}
	251
	252	next_gpe_xrupt->next = gpe_xrupt;
	253	gpe_xrupt->previous = next_gpe_xrupt;
	254	} else {
	255	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
	256	}
4bec3d80	257
3fe50208 BM	258	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	259
	260	/* Install new interrupt handler if not SCI_INT */
	261
	262	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
	263	status = acpi_os_install_interrupt_handler(interrupt_number,
	264	acpi_ev_gpe_xrupt_handler,
	265	gpe_xrupt);
	266	if (ACPI_FAILURE(status)) {
4bec3d80 BM	267	ACPI_EXCEPTION((AE_INFO, status,
	268	"Could not install GPE interrupt handler at level 0x%X",
	269	interrupt_number));
	270	return_ACPI_STATUS(status);
3fe50208 BM	271	}
	272	}
	273
4bec3d80 BM	274	*gpe_xrupt_block = gpe_xrupt;
4bec3d80 BM	275	return_ACPI_STATUS(AE_OK);
3fe50208 BM	276	}
	277
	278	/*******************************************************************************
	279	*
	280	* FUNCTION: acpi_ev_delete_gpe_xrupt
	281	*
	282	* PARAMETERS: gpe_xrupt - A GPE interrupt info block
	283	*
	284	* RETURN: Status
	285	*
	286	* DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
	287	* interrupt handler if not the SCI interrupt.
	288	*
	289	******************************************************************************/
	290
	291	acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
	292	{
	293	acpi_status status;
	294	acpi_cpu_flags flags;
	295
	296	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
	297
	298	/* We never want to remove the SCI interrupt handler */
	299
	300	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
	301	gpe_xrupt->gpe_block_list_head = NULL;
	302	return_ACPI_STATUS(AE_OK);
	303	}
	304
	305	/* Disable this interrupt */
	306
	307	status =
	308	acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
	309	acpi_ev_gpe_xrupt_handler);
	310	if (ACPI_FAILURE(status)) {
	311	return_ACPI_STATUS(status);
	312	}
	313
	314	/* Unlink the interrupt block with lock */
	315
	316	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	317	if (gpe_xrupt->previous) {
	318	gpe_xrupt->previous->next = gpe_xrupt->next;
	319	} else {
	320	/* No previous, update list head */
	321
	322	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
	323	}
	324
	325	if (gpe_xrupt->next) {
	326	gpe_xrupt->next->previous = gpe_xrupt->previous;
	327	}
	328	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	329
	330	/* Free the block */
	331
	332	ACPI_FREE(gpe_xrupt);
	333	return_ACPI_STATUS(AE_OK);
	334	}
	335
	336	/*******************************************************************************
	337	*
	338	* FUNCTION: acpi_ev_delete_gpe_handlers
	339	*
340	* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
341	* gpe_block - Gpe Block info
342	*
343	* RETURN: Status
344	*
345	* DESCRIPTION: Delete all Handler objects found in the GPE data structs.
346	* Used only prior to termination.
347	*
348	******************************************************************************/
349
350	acpi_status
351	acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
352	struct acpi_gpe_block_info *gpe_block,
353	void *context)
354	{
355	struct acpi_gpe_event_info *gpe_event_info;
5816b343 BM	356	struct acpi_gpe_notify_info *notify;
5816b343 BM	357	struct acpi_gpe_notify_info *next;
3fe50208 BM	358	u32 i;
	359	u32 j;
	360
	361	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
	362
	363	/* Examine each GPE Register within the block */
	364
	365	for (i = 0; i < gpe_block->register_count; i++) {
	366
	367	/* Now look at the individual GPEs in this byte register */
	368
	369	for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
	370	gpe_event_info = &gpe_block->event_info[((acpi_size) i *
	371	ACPI_GPE_REGISTER_WIDTH)
	372	+ j];
	373
	374	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	375	ACPI_GPE_DISPATCH_HANDLER) {
5816b343 BM	376
	377	/* Delete an installed handler block */
	378
3fe50208 BM	379	ACPI_FREE(gpe_event_info->dispatch.handler);
	380	gpe_event_info->dispatch.handler = NULL;
	381	gpe_event_info->flags &=
	382	~ACPI_GPE_DISPATCH_MASK;
1f86e8c1 LZ	383	} else
1f86e8c1 LZ	384	if ((gpe_event_info->
5816b343 BM	385	flags & ACPI_GPE_DISPATCH_MASK) ==
	386	ACPI_GPE_DISPATCH_NOTIFY) {
	387
	388	/* Delete the implicit notification device list */
	389
	390	notify = gpe_event_info->dispatch.notify_list;
	391	while (notify) {
	392	next = notify->next;
	393	ACPI_FREE(notify);
	394	notify = next;
	395	}
	396	gpe_event_info->dispatch.notify_list = NULL;
	397	gpe_event_info->flags &=
	398	~ACPI_GPE_DISPATCH_MASK;
3fe50208 BM	399	}
	400	}
	401	}
	402
	403	return_ACPI_STATUS(AE_OK);
	404	}
33620c54 BM	405
33620c54 BM	406	#endif /* !ACPI_REDUCED_HARDWARE */