[mirror_ubuntu-bionic-kernel.git] / drivers / acpi / acpica / evgpeinit.c

/******************************************************************************
 *
 * Module Name: evgpeinit - System GPE initialization and update
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeinit")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/*
 * Note: History of _PRW support in ACPICA
 *
 * Originally (2000 - 2010), the GPE initialization code performed a walk of
 * the entire namespace to execute the _PRW methods and detect all GPEs
 * capable of waking the system.
 *
 * As of 10/2010, the _PRW method execution has been removed since it is
 * actually unnecessary. The host OS must in fact execute all _PRW methods
 * in order to identify the device/power-resource dependencies. We now put
 * the onus on the host OS to identify the wake GPEs as part of this process
 * and to inform ACPICA of these GPEs via the acpi_setup_gpe_for_wake interface. This
 * not only reduces the complexity of the ACPICA initialization code, but in
 * some cases (on systems with very large namespaces) it should reduce the
 * kernel boot time as well.
 */

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_initialize
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
 *
 ******************************************************************************/
acpi_status acpi_ev_gpe_initialize(void)
{
	u32 register_count0 = 0;
	u32 register_count1 = 0;
	u32 gpe_number_max = 0;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_gpe_initialize);

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Initialize the GPE Block(s) defined in the FADT
	 *
	 * Why the GPE register block lengths are divided by 2:  From the ACPI
	 * Spec, section "General-Purpose Event Registers", we have:
	 *
	 * "Each register block contains two registers of equal length
	 *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
	 *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
	 *  The length of the GPE1_STS and GPE1_EN registers is equal to
	 *  half the GPE1_LEN. If a generic register block is not supported
	 *  then its respective block pointer and block length values in the
	 *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
	 *  to be the same size."
	 */

	/*
	 * Determine the maximum GPE number for this machine.
	 *
	 * Note: both GPE0 and GPE1 are optional, and either can exist without
	 * the other.
	 *
	 * If EITHER the register length OR the block address are zero, then that
	 * particular block is not supported.
	 */
	if (acpi_gbl_FADT.gpe0_block_length &&
	    acpi_gbl_FADT.xgpe0_block.address) {

		/* GPE block 0 exists (has both length and address > 0) */

		register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);

		gpe_number_max =
		    (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;

		/* Install GPE Block 0 */

		status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
						  &acpi_gbl_FADT.xgpe0_block,
						  register_count0, 0,
						  acpi_gbl_FADT.sci_interrupt,
						  &acpi_gbl_gpe_fadt_blocks[0]);

		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"Could not create GPE Block 0"));
		}
	}

	if (acpi_gbl_FADT.gpe1_block_length &&
	    acpi_gbl_FADT.xgpe1_block.address) {

		/* GPE block 1 exists (has both length and address > 0) */

		register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);

		/* Check for GPE0/GPE1 overlap (if both banks exist) */

		if ((register_count0) &&
		    (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
			ACPI_ERROR((AE_INFO,
				    "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
				    "(GPE %u to %u) - Ignoring GPE1",
				    gpe_number_max, acpi_gbl_FADT.gpe1_base,
				    acpi_gbl_FADT.gpe1_base +
				    ((register_count1 *
				      ACPI_GPE_REGISTER_WIDTH) - 1)));

			/* Ignore GPE1 block by setting the register count to zero */

			register_count1 = 0;
		} else {
			/* Install GPE Block 1 */

			status =
			    acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
						     &acpi_gbl_FADT.xgpe1_block,
						     register_count1,
						     acpi_gbl_FADT.gpe1_base,
						     acpi_gbl_FADT.
						     sci_interrupt,
						     &acpi_gbl_gpe_fadt_blocks
						     [1]);

			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"Could not create GPE Block 1"));
			}

			/*
			 * GPE0 and GPE1 do not have to be contiguous in the GPE number
			 * space. However, GPE0 always starts at GPE number zero.
			 */
			gpe_number_max = acpi_gbl_FADT.gpe1_base +
			    ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
		}
	}

	/* Exit if there are no GPE registers */

	if ((register_count0 + register_count1) == 0) {

		/* GPEs are not required by ACPI, this is OK */

		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "There are no GPE blocks defined in the FADT\n"));
		status = AE_OK;
		goto cleanup;
	}

	/* Check for Max GPE number out-of-range */

	if (gpe_number_max > ACPI_GPE_MAX) {
		ACPI_ERROR((AE_INFO,
			    "Maximum GPE number from FADT is too large: 0x%X",
			    gpe_number_max));
		status = AE_BAD_VALUE;
		goto cleanup;
	}

      cleanup:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_update_gpes
 *
 * PARAMETERS:  table_owner_id      - ID of the newly-loaded ACPI table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 *              result of a Load() or load_table() operation. If new GPE
 *              methods have been installed, register the new methods.
 *
 ******************************************************************************/

void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
{
	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_walk_info walk_info;
	acpi_status status = AE_OK;

	/*
	 * Find any _Lxx/_Exx GPE methods that have just been loaded.
	 *
	 * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
	 * enabled.
	 *
	 * Examine the namespace underneath each gpe_device within the
	 * gpe_block lists.
	 */
	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return;
	}

	walk_info.count = 0;
	walk_info.owner_id = table_owner_id;
	walk_info.execute_by_owner_id = TRUE;

	/* 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) {
			walk_info.gpe_block = gpe_block;
			walk_info.gpe_device = gpe_block->node;

			status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
							walk_info.gpe_device,
							ACPI_UINT32_MAX,
							ACPI_NS_WALK_NO_UNLOCK,
							acpi_ev_match_gpe_method,
							NULL, &walk_info, NULL);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"While decoding _Lxx/_Exx methods"));
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_info = gpe_xrupt_info->next;
	}

	if (walk_info.count) {
		ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_match_gpe_method
 *
 * PARAMETERS:  Callback from walk_namespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 *              control method under the _GPE portion of the namespace.
 *              Extract the name and GPE type from the object, saving this
 *              information for quick lookup during GPE dispatch. Allows a
 *              per-owner_id evaluation if execute_by_owner_id is TRUE in the
 *              walk_info parameter block.
 *
 *              The name of each GPE control method is of the form:
 *              "_Lxx" or "_Exx", where:
 *                  L      - means that the GPE is level triggered
 *                  E      - means that the GPE is edge triggered
 *                  xx     - is the GPE number [in HEX]
 *
 * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
 * with that owner.
 *
 ******************************************************************************/

acpi_status
acpi_ev_match_gpe_method(acpi_handle obj_handle,
			 u32 level, void *context, void **return_value)
{
	struct acpi_namespace_node *method_node =
	    ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	struct acpi_gpe_walk_info *walk_info =
	    ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_number;
	char name[ACPI_NAME_SIZE + 1];
	u8 type;

	ACPI_FUNCTION_TRACE(ev_match_gpe_method);

	/* Check if requested owner_id matches this owner_id */

	if ((walk_info->execute_by_owner_id) &&
	    (method_node->owner_id != walk_info->owner_id)) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Match and decode the _Lxx and _Exx GPE method names
	 *
	 * 1) Extract the method name and null terminate it
	 */
	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	name[ACPI_NAME_SIZE] = 0;

	/* 2) Name must begin with an underscore */

	if (name[0] != '_') {
		return_ACPI_STATUS(AE_OK);	/* Ignore this method */
	}

	/*
	 * 3) Edge/Level determination is based on the 2nd character
	 *    of the method name
	 */
	switch (name[1]) {
	case 'L':
		type = ACPI_GPE_LEVEL_TRIGGERED;
		break;

	case 'E':
		type = ACPI_GPE_EDGE_TRIGGERED;
		break;

	default:
		/* Unknown method type, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Ignoring unknown GPE method type: %s "
				  "(name not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* 4) The last two characters of the name are the hex GPE Number */

	gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
	if (gpe_number == ACPI_UINT32_MAX) {

		/* Conversion failed; invalid method, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Could not extract GPE number from name: %s "
				  "(name is not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* Ensure that we have a valid GPE number for this GPE block */

	gpe_event_info =
	    acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	if (!gpe_event_info) {
		/*
		 * This gpe_number is not valid for this GPE block, just ignore it.
		 * However, it may be valid for a different GPE block, since GPE0
		 * and GPE1 methods both appear under \_GPE.
		 */
		return_ACPI_STATUS(AE_OK);
	}

	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_HANDLER) {

		/* If there is already a handler, ignore this GPE method */

		return_ACPI_STATUS(AE_OK);
	}

	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_METHOD) {
		/*
		 * If there is already a method, ignore this method. But check
		 * for a type mismatch (if both the _Lxx AND _Exx exist)
		 */
		if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
			ACPI_ERROR((AE_INFO,
				    "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
				    gpe_number, gpe_number, gpe_number));
		}
		return_ACPI_STATUS(AE_OK);
	}

	/* Disable the GPE in case it's been enabled already. */
	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);

	/*
	 * Add the GPE information from above to the gpe_event_info block for
	 * use during dispatch of this GPE.
	 */
	gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK);
	gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
	gpe_event_info->dispatch.method_node = method_node;

	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
			  "Registered GPE method %s as GPE number 0x%.2X\n",
			  name, gpe_number));
	return_ACPI_STATUS(AE_OK);
}

#endif				/* !ACPI_REDUCED_HARDWARE */
Commit	Line	Data
3fe50208 BM	1	/******************************************************************************
	2	*
	3	* Module Name: evgpeinit - System GPE initialization and update
	4	*
	5	*****************************************************************************/
	6
	7	/*
77848130	8	* Copyright (C) 2000 - 2012, 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	#include "acnamesp.h"
3fe50208 BM	48
	49	#define _COMPONENT ACPI_EVENTS
	50	ACPI_MODULE_NAME("evgpeinit")
33620c54	51	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
da503373 LM	52	/*
	53	* Note: History of _PRW support in ACPICA
	54	*
	55	* Originally (2000 - 2010), the GPE initialization code performed a walk of
	56	* the entire namespace to execute the _PRW methods and detect all GPEs
	57	* capable of waking the system.
	58	*
	59	* As of 10/2010, the _PRW method execution has been removed since it is
	60	* actually unnecessary. The host OS must in fact execute all _PRW methods
	61	* in order to identify the device/power-resource dependencies. We now put
	62	* the onus on the host OS to identify the wake GPEs as part of this process
	63	* and to inform ACPICA of these GPEs via the acpi_setup_gpe_for_wake interface. This
	64	* not only reduces the complexity of the ACPICA initialization code, but in
	65	* some cases (on systems with very large namespaces) it should reduce the
	66	* kernel boot time as well.
	67	*/
	68
3fe50208 BM	69	/*******************************************************************************
	70	*
	71	* FUNCTION: acpi_ev_gpe_initialize
	72	*
	73	* PARAMETERS: None
	74	*
	75	* RETURN: Status
	76	*
	77	* DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
	78	*
	79	******************************************************************************/
	80	acpi_status acpi_ev_gpe_initialize(void)
	81	{
	82	u32 register_count0 = 0;
	83	u32 register_count1 = 0;
	84	u32 gpe_number_max = 0;
	85	acpi_status status;
	86
	87	ACPI_FUNCTION_TRACE(ev_gpe_initialize);
	88
	89	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	90	if (ACPI_FAILURE(status)) {
	91	return_ACPI_STATUS(status);
	92	}
	93
	94	/*
	95	* Initialize the GPE Block(s) defined in the FADT
	96	*
	97	* Why the GPE register block lengths are divided by 2: From the ACPI
	98	* Spec, section "General-Purpose Event Registers", we have:
	99	*
	100	* "Each register block contains two registers of equal length
	101	* GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
	102	* GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
	103	* The length of the GPE1_STS and GPE1_EN registers is equal to
	104	* half the GPE1_LEN. If a generic register block is not supported
	105	* then its respective block pointer and block length values in the
	106	* FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
	107	* to be the same size."
	108	*/
	109
	110	/*
	111	* Determine the maximum GPE number for this machine.
	112	*
	113	* Note: both GPE0 and GPE1 are optional, and either can exist without
	114	* the other.
	115	*
	116	* If EITHER the register length OR the block address are zero, then that
	117	* particular block is not supported.
	118	*/
	119	if (acpi_gbl_FADT.gpe0_block_length &&
	120	acpi_gbl_FADT.xgpe0_block.address) {
	121
	122	/* GPE block 0 exists (has both length and address > 0) */
	123
	124	register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
	125
	126	gpe_number_max =
	127	(register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
	128
	129	/* Install GPE Block 0 */
	130
	131	status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
	132	&acpi_gbl_FADT.xgpe0_block,
133	register_count0, 0,
134	acpi_gbl_FADT.sci_interrupt,
135	&acpi_gbl_gpe_fadt_blocks[0]);
136
137	if (ACPI_FAILURE(status)) {
138	ACPI_EXCEPTION((AE_INFO, status,
139	"Could not create GPE Block 0"));
140	}
141	}
142
143	if (acpi_gbl_FADT.gpe1_block_length &&
144	acpi_gbl_FADT.xgpe1_block.address) {
145
146	/* GPE block 1 exists (has both length and address > 0) */
147
148	register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
149
150	/* Check for GPE0/GPE1 overlap (if both banks exist) */
151
152	if ((register_count0) &&
153	(gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
154	ACPI_ERROR((AE_INFO,
155	"GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
156	"(GPE %u to %u) - Ignoring GPE1",
157	gpe_number_max, acpi_gbl_FADT.gpe1_base,
158	acpi_gbl_FADT.gpe1_base +
159	((register_count1 *
160	ACPI_GPE_REGISTER_WIDTH) - 1)));
161
162	/* Ignore GPE1 block by setting the register count to zero */
163
164	register_count1 = 0;
165	} else {
166	/* Install GPE Block 1 */
167
168	status =
169	acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
170	&acpi_gbl_FADT.xgpe1_block,
171	register_count1,
172	acpi_gbl_FADT.gpe1_base,
173	acpi_gbl_FADT.
174	sci_interrupt,
175	&acpi_gbl_gpe_fadt_blocks
176	[1]);
177
178	if (ACPI_FAILURE(status)) {
179	ACPI_EXCEPTION((AE_INFO, status,
180	"Could not create GPE Block 1"));
181	}
182
183	/*
184	* GPE0 and GPE1 do not have to be contiguous in the GPE number
185	* space. However, GPE0 always starts at GPE number zero.
186	*/
187	gpe_number_max = acpi_gbl_FADT.gpe1_base +
188	((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
189	}
190	}
191
192	/* Exit if there are no GPE registers */
193
194	if ((register_count0 + register_count1) == 0) {
195
196	/* GPEs are not required by ACPI, this is OK */
197
198	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
199	"There are no GPE blocks defined in the FADT\n"));
200	status = AE_OK;
201	goto cleanup;
202	}
203
204	/* Check for Max GPE number out-of-range */
205
206	if (gpe_number_max > ACPI_GPE_MAX) {
207	ACPI_ERROR((AE_INFO,
208	"Maximum GPE number from FADT is too large: 0x%X",
209	gpe_number_max));
210	status = AE_BAD_VALUE;
211	goto cleanup;
212	}
213
214	cleanup:
215	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
216	return_ACPI_STATUS(AE_OK);
217	}
218
219	/*******************************************************************************
220	*
221	* FUNCTION: acpi_ev_update_gpes
222	*
223	* PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table
224	*
225	* RETURN: None
226	*
227	* DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
228	* result of a Load() or load_table() operation. If new GPE
a2100801	229	* methods have been installed, register the new methods.
3fe50208 BM	230	*
	231	******************************************************************************/
	232
	233	void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
	234	{
	235	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	236	struct acpi_gpe_block_info *gpe_block;
	237	struct acpi_gpe_walk_info walk_info;
	238	acpi_status status = AE_OK;
3fe50208 BM	239
3fe50208 BM	240	/*
da503373	241	* Find any _Lxx/_Exx GPE methods that have just been loaded.
3fe50208	242	*
9874647b RW	243	* Any GPEs that correspond to new _Lxx/_Exx methods are immediately
9874647b RW	244	* enabled.
3fe50208 BM	245	*
	246	* Examine the namespace underneath each gpe_device within the
	247	* gpe_block lists.
	248	*/
	249	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	250	if (ACPI_FAILURE(status)) {
	251	return;
	252	}
	253
da503373	254	walk_info.count = 0;
9874647b RW	255	walk_info.owner_id = table_owner_id;
9874647b RW	256	walk_info.execute_by_owner_id = TRUE;
3fe50208 BM	257
	258	/* Walk the interrupt level descriptor list */
	259
	260	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	261	while (gpe_xrupt_info) {
	262
	263	/* Walk all Gpe Blocks attached to this interrupt level */
	264
	265	gpe_block = gpe_xrupt_info->gpe_block_list_head;
	266	while (gpe_block) {
	267	walk_info.gpe_block = gpe_block;
	268	walk_info.gpe_device = gpe_block->node;
	269
	270	status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
	271	walk_info.gpe_device,
	272	ACPI_UINT32_MAX,
	273	ACPI_NS_WALK_NO_UNLOCK,
	274	acpi_ev_match_gpe_method,
	275	NULL, &walk_info, NULL);
	276	if (ACPI_FAILURE(status)) {
	277	ACPI_EXCEPTION((AE_INFO, status,
	278	"While decoding _Lxx/_Exx methods"));
	279	}
	280
	281	gpe_block = gpe_block->next;
	282	}
	283
	284	gpe_xrupt_info = gpe_xrupt_info->next;
	285	}
	286
9874647b RW	287	if (walk_info.count) {
9874647b RW	288	ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
3fe50208 BM	289	}
	290
	291	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	292	return;
	293	}
	294
	295	/*******************************************************************************
	296	*
	297	* FUNCTION: acpi_ev_match_gpe_method
	298	*
	299	* PARAMETERS: Callback from walk_namespace
	300	*
	301	* RETURN: Status
	302	*
	303	* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
	304	* control method under the _GPE portion of the namespace.
	305	* Extract the name and GPE type from the object, saving this
	306	* information for quick lookup during GPE dispatch. Allows a
	307	* per-owner_id evaluation if execute_by_owner_id is TRUE in the
	308	* walk_info parameter block.
	309	*
	310	* The name of each GPE control method is of the form:
	311	* "_Lxx" or "_Exx", where:
	312	* L - means that the GPE is level triggered
	313	* E - means that the GPE is edge triggered
	314	* xx - is the GPE number [in HEX]
	315	*
	316	* If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
da503373	317	* with that owner.
3fe50208 BM	318	*
	319	******************************************************************************/
	320
	321	acpi_status
	322	acpi_ev_match_gpe_method(acpi_handle obj_handle,
	323	u32 level, void context, void *return_value)
	324	{
	325	struct acpi_namespace_node *method_node =
	326	ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	327	struct acpi_gpe_walk_info *walk_info =
	328	ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	329	struct acpi_gpe_event_info *gpe_event_info;
3fe50208 BM	330	u32 gpe_number;
	331	char name[ACPI_NAME_SIZE + 1];
	332	u8 type;
	333
	334	ACPI_FUNCTION_TRACE(ev_match_gpe_method);
	335
	336	/* Check if requested owner_id matches this owner_id */
	337
	338	if ((walk_info->execute_by_owner_id) &&
	339	(method_node->owner_id != walk_info->owner_id)) {
	340	return_ACPI_STATUS(AE_OK);
	341	}
	342
	343	/*
	344	* Match and decode the _Lxx and _Exx GPE method names
	345	*
	346	* 1) Extract the method name and null terminate it
	347	*/
	348	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	349	name[ACPI_NAME_SIZE] = 0;
	350
	351	/* 2) Name must begin with an underscore */
	352
	353	if (name[0] != '_') {
	354	return_ACPI_STATUS(AE_OK); /* Ignore this method */
	355	}
	356
	357	/*
	358	* 3) Edge/Level determination is based on the 2nd character
	359	* of the method name
3fe50208 BM	360	*/
	361	switch (name[1]) {
	362	case 'L':
	363	type = ACPI_GPE_LEVEL_TRIGGERED;
	364	break;
	365
	366	case 'E':
	367	type = ACPI_GPE_EDGE_TRIGGERED;
	368	break;
	369
	370	default:
	371	/* Unknown method type, just ignore it */
	372
	373	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	374	"Ignoring unknown GPE method type: %s "
	375	"(name not of form _Lxx or _Exx)", name));
	376	return_ACPI_STATUS(AE_OK);
	377	}
	378
	379	/* 4) The last two characters of the name are the hex GPE Number */
	380
	381	gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
	382	if (gpe_number == ACPI_UINT32_MAX) {
	383
	384	/* Conversion failed; invalid method, just ignore it */
	385
	386	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	387	"Could not extract GPE number from name: %s "
	388	"(name is not of form _Lxx or _Exx)", name));
	389	return_ACPI_STATUS(AE_OK);
	390	}
	391
	392	/* Ensure that we have a valid GPE number for this GPE block */
	393
	394	gpe_event_info =
	395	acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	396	if (!gpe_event_info) {
	397	/*
	398	* This gpe_number is not valid for this GPE block, just ignore it.
	399	* However, it may be valid for a different GPE block, since GPE0
	400	* and GPE1 methods both appear under \_GPE.
	401	*/
	402	return_ACPI_STATUS(AE_OK);
	403	}
	404
	405	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	406	ACPI_GPE_DISPATCH_HANDLER) {
	407
	408	/* If there is already a handler, ignore this GPE method */
	409
	410	return_ACPI_STATUS(AE_OK);
	411	}
	412
	413	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	414	ACPI_GPE_DISPATCH_METHOD) {
	415	/*
	416	* If there is already a method, ignore this method. But check
	417	* for a type mismatch (if both the _Lxx AND _Exx exist)
	418	*/
	419	if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
	420	ACPI_ERROR((AE_INFO,
	421	"For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
	422	gpe_number, gpe_number, gpe_number));
	423	}
424	return_ACPI_STATUS(AE_OK);
425	}
426
5acdb1af RW	427	/* Disable the GPE in case it's been enabled already. */
	428	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
	429
3fe50208 BM	430	/*
	431	* Add the GPE information from above to the gpe_event_info block for
	432	* use during dispatch of this GPE.
	433	*/
bba63a29	434	gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK);
3fe50208 BM	435	gpe_event_info->flags \|= (u8)(type \| ACPI_GPE_DISPATCH_METHOD);
	436	gpe_event_info->dispatch.method_node = method_node;
	437
3fe50208 BM	438	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	439	"Registered GPE method %s as GPE number 0x%.2X\n",
	440	name, gpe_number));
	441	return_ACPI_STATUS(AE_OK);
	442	}
33620c54 BM	443
33620c54 BM	444	#endif /* !ACPI_REDUCED_HARDWARE */